Artificial Intelligence (e.g., Fuzzy Logic) Patents (Class 701/44)
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Publication number: 20100023222Abstract: System and method for location based configuration of guidance controllers for machines. In one embodiment, a method includes detecting an implement, by a guidance controller, coupled to a machine. The method may further include detecting location data for the machine by the guidance controller, determining a characteristic of the location which affects a calibration parameter of the guidance controller, configuring the calibration parameter of the guidance controller based, at least in part, on the characteristic of the location, and controlling operation of the machine and implement based on the calibration parameter.Type: ApplicationFiled: July 22, 2008Publication date: January 28, 2010Applicant: Trimble Navigation LimitedInventor: Gregory Daniel CHIOCCO
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Publication number: 20100023223Abstract: An adaptive vehicle control system that classifies a driver's driving style based on characteristic curve-handling maneuvers and road and traffic conditions. The system includes a plurality of vehicle sensors that detect various vehicle parameters. A maneuver identification processor receives the sensor signals to identify a characteristic maneuver of the vehicle and provides a maneuver identifier signal of the maneuver. The system also includes a traffic and road condition recognition processor that receives the sensor signals, and provides traffic condition signals identifying traffic conditions and road condition signals identifying road conditions. A style characterization processor receives the maneuver identifier signals, sensor signals from the vehicle sensors and the traffic and road condition signals, and classifies driving style based on the signals to classify the style of the driver driving the vehicle.Type: ApplicationFiled: July 24, 2008Publication date: January 28, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Jihua Huang, Yuen-Kwok Chin, William C. Lin
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Patent number: 7624837Abstract: In a hydraulic power steering apparatus, hydraulic pressure for generating steering assist power is varied by varying opening of a variable throttle portion by movement of a spool. The spool is disposed in a provisional origin by driving a stepping motor in one direction according to a number of steps for setting provisional origin from a position at a time of start of control, and the number of steps at a time of completing of the driving is set to a provisional origin for calculation. In a return to origin permission state where the spool is disposed in a provisional origin and the number of steps from the provisional origin for calculation is zero, a number of steps at a time when the driving of the stepping motor according to a number of steps obtained by subtracting the number of steps for setting provisional origin from a number of steps for setting origin is completed is set to an origin for calculation, and the movement of the spool is stopped at the origin with a stopper.Type: GrantFiled: October 19, 2006Date of Patent: December 1, 2009Assignee: JTEKT CorporationInventor: Yoji Taniguchi
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Patent number: 7596441Abstract: In a power steering device employing a hydraulic power cylinder, a motor-driven pump, and a driving power source for the motor, a power steering control system is configured to electrically connected to at least the motor and the power source for controlling a driving state of the motor and a power source voltage of the power source. The power steering control system includes a motor control circuit that generates a motor driving signal, whose command signal value is determined based on a steering assist force applied through the power cylinder to steered road wheels, a booster circuit that boosts the power source voltage, a motor angular acceleration detection circuit that detects or estimates a motor angular acceleration, and a booster-circuit control circuit that controls, responsively to the motor angular acceleration, switching between operating and non-operating states of the booster circuit.Type: GrantFiled: June 12, 2006Date of Patent: September 29, 2009Assignee: Hitachi, Ltd.Inventors: Tadaharu Yokota, Kiyoshi Inoue, Toru Takahashi
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Publication number: 20090222170Abstract: Lane maintenance assistant for motor vehicles, having a sensor device for recognizing the lanes on the roadway, a control device that exerts a force on the steering system of the vehicle via an actuating element in order to hold the vehicle in the lane, and a device for recognizing an intention to change lanes on the part of the driver, wherein the control device is fashioned so as to asymmetrically modify the force exerted on the steering system when a lane change intention is recognized, in order to make the lane change easier.Type: ApplicationFiled: April 26, 2006Publication date: September 3, 2009Inventors: Michael Scherl, Michael Weilkes, Lutz Buerkle, Tobias Rentschler
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Publication number: 20090048738Abstract: In a driving assistance system having an actuator (16) for steering steered wheels of a vehicle, a positional deviation detecting unit (9) detects a deviation of a position of the vehicle from a forward travel path of the vehicle based on information around the vehicle. A steering control variable determination unit (2) determines a steering control variable to cancel the deviation. If a vehicle speed detected by a vehicle speed detecting unit is equal to or greater than a predetermined speed, the steering control variable determined by a steering control variable determination unit (2) decreases with an increase of the vehicle speed under the condition that the deviation of the position of the vehicle from the forward travel path is same. The driving assistance system can reduce a driver's discomfort caused by the steering control through the actuator (16) when the vehicle is running at a high speed.Type: ApplicationFiled: November 30, 2006Publication date: February 19, 2009Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Katsuhiko Iwazaki, Seiji Kawakami, Hiroaki Kataoka, Chumsamutr Rattapon
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Publication number: 20090048737Abstract: An awake state estimation portion calculates an average steering angle, an average steering angular speed and a corrective steering angle on the basis of the steering angle acquired from a steering angle detection portion. The awake state estimation portion acquires the traveling speed of the vehicle from a vehicle speed detection portion. The awake state estimation portion corrects the calculated corrective steering angle by a correction value commensurate with the type of the traveling path on which the vehicle is traveling, and estimates the degree of the awake state of the driver on the basis of the post-correction corrective steering angle. Besides, the awake state estimation portion specifically determines the correction value commensurate with the type of the traveling path on which the vehicle is traveling, on the basis of at least one of the steering angle, the average steering angular speed and the traveling speed.Type: ApplicationFiled: September 30, 2008Publication date: February 19, 2009Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira NAKAGOSHI, Kenji Kimura, Tsuyoshi Ehama
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Patent number: 7486203Abstract: A parking assist apparatus for a vehicle includes a recognizing apparatus for recognizing a target position for parking the vehicle, a calculating apparatus for calculating a course for parking the vehicle from a current vehicle position to the target position recognized by the recognizing apparatus during the vehicle being moving and an informing apparatus for informing a user of the vehicle that the vehicle can be parked at the recognized target position when the course of the vehicle has been correctly calculated by the calculating apparatus.Type: GrantFiled: April 27, 2005Date of Patent: February 3, 2009Assignee: Aisin Seiki Kabushiki KaishaInventors: Yuu Tanaka, Tomohiko Endo, Hideyuki Iwakiri, Toru Sugiyama, Yoichi Iwata, Hisashi Satonaka, Takuya Itoh
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Patent number: 7487020Abstract: A driving assist apparatus for a vehicle that guides the vehicle to a target position is provided. On the basis of the present direction of the vehicle and the direction of the vehicle at the target position, a basic path that changes the vehicle direction so as to coincide with the target direction of the vehicle at the target position is computed. A path from the present position to the target position is computed by adding a straight-line path to the basic path under a predetermined condition.Type: GrantFiled: June 21, 2004Date of Patent: February 3, 2009Assignee: Toyota Jidosha Kabushiki KaishaInventors: Katsuhiko Iwazaki, Hisashi Satonaka, Yuichi Kubota, Tomohiko Endo, Akira Matsui, Hideyuki Iwakiri, Toru Sugiyama, Seiji Kawakami, Hiroaki Kataoka, Arata Takahashi, Yoshiki Ninomiya
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Publication number: 20090030575Abstract: A system for providing enhanced steering pull compensation is provided. The system compensates for steering pull in a vehicle using a signal from a pull compensation signal generator. The signal from the pull compensation signal generator is processed though a processing mechanism. The processing mechanism controls a power steering assist motor through fault and limit logic as a function of the pull compensation signal generator, thereby providing steering pull compensation. The processing mechanism also controls the power steering assist motor based on input from a vehicle speed sensor and a calibration input mechanism.Type: ApplicationFiled: August 26, 2008Publication date: January 29, 2009Inventors: Julie A. Kleinau, Troy P. Strieter
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Publication number: 20090030574Abstract: To provide a vehicle motion control system capable of defining clear guidelines on more specific control timing associated with accelerating, steering, and braking operations, and conducting motion control based on the defined guidelines. An ideal motion control unit 42 within a central controller 40 uses longitudinal jerk information of a vehicle to control the steering of the vehicle. Information for determining the initiation timing of steering is presented from a human-vehicle interface (HVI) 55 to a driver. In accordance with the information presented from the HVI 55, the driver controls the initiation timing of steering.Type: ApplicationFiled: July 26, 2007Publication date: January 29, 2009Applicant: Hitachi, Ltd.Inventors: Makoto Yamakado, Atsushi Yokoyama, Masato Abe
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Patent number: 7477758Abstract: System and method for detecting the presence of contents of a vehicular compartment in which a detector system generates an output signal indicative of the absence of an object in the compartment when an object is not situated in the compartment and a different output signal indicative of a particular object in the compartment when such an object is situated in the compartment. Different output signals are thus generated for different objects. A processor is coupled to the detector system for processing the output signal to create a signal characteristic of the object which is indicative of whether the object is animate or inanimate. This system is coupled to a reactive system for affecting one or more vehicular components when the created signal is indicative of an animate object. The reactive system may be a release device for opening an access door or panel to the compartment.Type: GrantFiled: June 19, 2006Date of Patent: January 13, 2009Assignee: Automotive Technologies International, Inc.Inventors: Ray Piirainen, David S. Breed, Wendell C. Johnson, Wilbur E. DuVall
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Publication number: 20080319613Abstract: A turning behavior control apparatus and turning behavior control process for a motor vehicle is disclosed. The apparatus is configured to set a target vehicle turning behavior (such as the target side slip angle and the target yaw rate) in accordance with a driver's steering operation, to independently set a target vehicle yaw direction, to modify the target vehicle turning behavior in accordance with the target vehicle yaw direction, to calculate target front and rear wheel steer angles in accordance with the modified target turning behavior and to control steer mechanisms in accordance therewith.Type: ApplicationFiled: February 15, 2007Publication date: December 25, 2008Applicant: Nissan Motor Co., Ltd.Inventors: Yutaka Mikuriya, Takuma Suzuki, Tadashi Tamasho
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Publication number: 20080281491Abstract: A steering control apparatus for a vehicle having a power source for generating power, and drive shafts for transferring the power to driving wheels of the vehicle, and a traction control device for controlling braking torque applied to the wheels. The apparatus comprises a detection device for detecting the braking torque applied to the wheels, a calculation device for calculating a driving force difference between the wheels, on the basis of the detected braking torque, a power source state detection device for detecting an actuating state of the power source, and a control device for controlling steering torque created by the steering wheel, and applying torque steer reducing torque to the steering wheel. A desired value of the torque steer reducing torque is determined, based on the driving force difference and the actuating state of the power source.Type: ApplicationFiled: July 16, 2008Publication date: November 13, 2008Inventors: Yoshiyuki Yasui, Hiroyuki Kodama, Kenji Asano, Toshihisa Kato
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Patent number: 7424352Abstract: A driving situation detection system capable of detecting driving situations swiftly with high reliability is obtained. The driving situation detection system includes real curve arithmetic means reference vehicle model and observer means, a differentiator unit, a model curve radius arithmetic means, and an assessment unit. The arithmetic means generates real curve radius signals based on wheel speeds. The reference vehicle model and observer means processes input signals utilizing a linear reference model to generate a yaw rate signal and a vehicle body side slip angle signal. The unit differentiates the vehicle body side slip angle signal to generate a vehicle body side slip rate signal. The model curve radius arithmetic means generates a model curve radius signal based on the yaw rate signal and the vehicle body side slip rate signal. The assessment unit detects undesirable driving situations by comparing the real curve radius and the model curve radius.Type: GrantFiled: February 1, 2005Date of Patent: September 9, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Matsunaga, Marcus Hiemer
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Patent number: 7415126Abstract: Optical classification method for classifying an occupant in a vehicle by acquiring images of the occupant from a single camera and analyzing the images acquired from the single camera to determine a classification of the occupant. The single camera may be a digital CMOS camera, a high-power near-infrared LED, and the LED control circuit. It is possible to detect brightness of the images and control illumination of an LED in conjunction with the acquisition of images by the single camera. The illumination of the LED may be periodic to enable a comparison of resulting images with the LED on and the LED off so as to determine whether a daytime condition or a nighttime condition is present. The position of the occupant can be monitored when the occupant is classified as a child, an adult or a forward-facing child restraint.Type: GrantFiled: April 14, 2003Date of Patent: August 19, 2008Assignee: Automotive Technologies International Inc.Inventors: David S. Breed, Wilbur E. DuVall, Wendell C. Johnson, Tie-Qi Chen
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Publication number: 20080195281Abstract: A human perception model for a vehicle steering control method including the steps of obtaining a heading error, obtaining a velocity value, obtaining a distance error, applying the heading error, inputting a measure of operator aggressiveness and defuzzifying an output from a steering rule base. The velocity value and the distance error are applied along with the heading error to fuzzy logic membership functions to produce an output that is applied to a steering rule base. A measure of the operator aggressiveness is input to the steering rule base. An output from the steering rule base is defuzzified to produce a steering signal.Type: ApplicationFiled: February 12, 2007Publication date: August 14, 2008Inventors: William Robert Norris, Bernard Edwin Romig, John Franklin Reid, Brian Joseph Gilmore
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Publication number: 20080195282Abstract: A steering control method including the steps of obtaining a heading error, obtaining a velocity value, obtaining a distance error, applying the heading error and defuzzrfying an output from a steering rule base. The velocity value and the distance error are applied along with the heading error to fuzzy logic membership functions to produce an output that is applied to a steering rule base.Type: ApplicationFiled: February 12, 2007Publication date: August 14, 2008Inventors: William Robert Norris, Bernard Edwin Romig, John Franklin Reid
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Patent number: 7363186Abstract: The current drawn by a precision resistor that is selectively connected across a load is utilized to calibrate a current sensed by current sensing device that is connected in series with the load.Type: GrantFiled: December 22, 2006Date of Patent: April 22, 2008Assignee: Kelsey-Haynes CompanyInventors: Scott M. Costello, Akio Fujimaki, John A. Janitz, Cristian R. Ludwig, Robert D. Mills, Allen L. Youngpeter
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Publication number: 20080091321Abstract: A vehicle steering control device capable of executing automatic steering and manual steering includes: an automatic control amount-setting device that sets a target automatic control amount based on information about vehicle behavior and ambient environment; a steering control amount-setting device that sets a target steering amount based on a manual steering amount input by a driver and the set target automatic control amount; and a steering device that steers based on the set target steering amount. When the target automatic control amount contributes more in the setting of the target steering amount than the manual steering amount does, the steering control amount-setting device sets the target steering amount so as to better the responsiveness in the lateral shift of the vehicle relatively to the responsiveness in the turning of the vehicle, in comparison with when the target automatic amount does not contribute more than the manual steering amount.Type: ApplicationFiled: October 3, 2007Publication date: April 17, 2008Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Norihisa NISHIKAWA
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Patent number: 7344037Abstract: An inventory storage and retrieval system and method are provided for a shipping or storage facility. In an embodiment, the system includes: (a) a mobile computer and radio on a load-handing vehicle; (b) sensors on the vehicle to determine the ground location and orientation of the vehicle; (c) encoders that determine the position of a lifting mechanism relative to a chassis of the vehicle; and (d) a base computer and radio that communicates with the vehicle. The system maintains an inventory database of items and their respective storage locations in three dimensions as a result of the loading activity of the vehicle. The data can be used to guide the vehicle for ground movement generally to a storage location, appropriately orient the vehicle, and then to move the lifting mechanism of the vehicle to deposit or retrieve the item at a particular storage location.Type: GrantFiled: July 15, 2004Date of Patent: March 18, 2008Assignee: Mi-Jack Products, Inc.Inventors: Daniel Brian Zakula, Sr., Harvey E. Schmidt
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Patent number: 7272479Abstract: The invention proposes an electrically operated power steering controller for inputting a driving electric current offset value of higher accuracy and being able to make an offset correction of a driving electric current by using this driving electric current offset value of higher accuracy, and an adjusting method of this driving electric current offset. Therefore, an electric motor driving electric current measuring device of accuracy higher than that of an electric motor driving electric current detector assembled into a controller CNT is prepared separately from this electric motor driving electric current detector. The driving electric current offset value of high accuracy is outputted by this electric motor driving electric current measuring device. An input device for receiving the driving electric current offset value of high accuracy from the driving electric current measuring device is arranged in an offset correcting device or an offset signal generator within the controller.Type: GrantFiled: November 3, 2004Date of Patent: September 18, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Takayuki Kifuku
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Patent number: 7177743Abstract: The vehicle control system having an adaptive controller is provided that accomplishes unsupervised learning such that no prior extensive training is needed for every situation. The inventive controller system is based on a neural network evolved with genetic algorithm. The genetic algorithm will determine the parameters of the neurons, the connections between the neurons and the associated weights to yield the best results. The genetic algorithm evaluates current candidate structures for accomplishing the desired result and develops new candidate structures by reproducing prior candidate structures with modification that replaces the least fit former candidate structures until the system is well satisfied. The vehicle control system is well satisfied when the desired result is met or some failure condition is triggered for vehicle control system whereby the action is never repeated.Type: GrantFiled: June 2, 2004Date of Patent: February 13, 2007Assignee: Toyota Engineering & Manufacturing North America, Inc.Inventor: Rini Roy
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Patent number: 7096192Abstract: A method and system for detecting fraud in a credit card transaction between consumer and a merchant over the Internet. The method and system comprises obtaining credit card information relating to the transaction from the consumer; and verifying the credit card information based upon a variety of parameters. The variety of parameters are weighted so as to provide a merchant with a quantifiable indication of whether the credit card transaction is fraudulent. In so doing, an integrated verification system is provided which allows a merchant, or the like, to accurately and efficiently determine the validity of a transaction over the Internet.Type: GrantFiled: November 17, 1999Date of Patent: August 22, 2006Assignee: CyberSource CorporationInventor: John Philip Pettitt
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Patent number: 7073623Abstract: A method and system for controlling an electrical steering system supports both manned and unmanned operation of a steering system for a vehicle. A steering wheel is coupled to an electric motor shaft for rotation with the steering wheel. A torque transducer senses a torque level for any application of rotational force applied to the steering wheel. An operator detector detects a presence or absence of an operator based on the sensed torque. The steering is controlled based on the detected presence or absence of the operator.Type: GrantFiled: May 11, 2005Date of Patent: July 11, 2006Assignee: Deere & CompanyInventor: Christopher David Glenn Turner
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Patent number: 7032763Abstract: An automatic guidance system and method are provided for a gantry crane to permit accurate tracking along a path, including a curved path. The position of the crane is determined from two spaced apart GPS receivers fixed to the crane. A guidance controller determines a plurality of error measurements from respective front, center and rear points of the crane relative to a current tracking line, which is a line tangent to the path at a current position of crane. In an embodiment, the system includes a base station that can be used to transmit data to the crane to specify a particular destination location of the drive path, or to transmit data representing the drive path itself.Type: GrantFiled: November 18, 2002Date of Patent: April 25, 2006Assignee: Mi-Jack Products, Inc.Inventors: Daniel Brian Zakula, Sr., Harvey E. Schmidt
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Patent number: 6988583Abstract: A method and system for controlling an electrical steering system supports both manned and unmanned operation of a steering system for a vehicle. A steering wheel is coupled to an electric motor shaft for rotation with the steering wheel. A torque transducer senses a torque level for any application of rotational force applied to the steering wheel. An operator detector detects a presence or absence of an operator based on the sensed torque. The steering is controlled based on the detected presence or absence of the operator.Type: GrantFiled: October 30, 2003Date of Patent: January 24, 2006Assignee: Deere & CompanyInventor: Christopher David Glenn Turner
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Patent number: 6987371Abstract: A steering controlling device comprising a power source, a motor connected to a steering system, a motor driving circuit converting a power source voltage to a predetermined voltage and applying the voltage to the motor, and a controlling means for controlling the motor driving circuit, wherein the controlling means controls the motor driving circuit so as to boost the power source voltage when a rotational speed of the motor is a predetermined value or more, whereby a sufficient motor output torque is obtainable under various steering conditions in use of a converter, an efficiency is improved by suppressing a frequency of operating the converter, and an appropriate fail safe treatment is conducted when the converter is disordered.Type: GrantFiled: September 26, 2001Date of Patent: January 17, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Takayuki Kifuku
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Patent number: 6988027Abstract: In an electric power steering system, during initial processing after an ignition switch is turned on, when a main CPU completes calculation of an offset voltage, it sends an offset voltage calculation request signal to a sub CPU. When the time from sending the offset voltage calculation request signal until the main CPU receives an offset voltage calculation completion signal from the sub CPU is within a predetermined period of time, it is determined that a communication function between the main CPU and the sub CPU and an offset voltage calculation function of the sub CPU are normal, and at the same time it is possible to maintain synchronism of the offset voltage calculation in the main CPU with the offset voltage calculation in the sub CPU. Thus, it is possible to carry out in a short time a check of the communication function between the main CPU and the sub CPU, while maintaining the synchronism in the offset voltage calculations by the two CPUs when calculating an actual motor current.Type: GrantFiled: August 25, 2004Date of Patent: January 17, 2006Assignees: Honda Motor Co., Ltd., Showa CorporationInventors: Masato Yuda, Mitsunori Kawashima, Hiroaki Ishigaki
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Patent number: 6980124Abstract: The present invention relates to a security, telemetry and control system which utilizes wireless communication between a control unit and smart relay(s) within the vehicle and also utilizes wireless communication between the vehicle and a remote base station to monitor and protect a vehicle or piece of equipment against unauthorized users and thieves.Type: GrantFiled: July 15, 2003Date of Patent: December 27, 2005Assignee: Autosafe International, Inc.Inventors: Qin Kong, Frank Stevens
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Patent number: 6950712Abstract: A control system using a genetic analyzer based on discrete constraints is described. In one embodiment, a genetic algorithm with step-coded chromosomes is used to develop a teaching signal that provides good control qualities for a controller with discrete constraints, such as, for example, a step-constrained controller. In one embodiment, the control system uses a fitness (performance) function that is based on the physical laws of minimum entropy. In one embodiment, the genetic analyzer is used in an off-line mode to develop a teaching signal for a fuzzy logic classifier system that develops a knowledge base. The teaching signal can be approximated online by a fuzzy controller that operates using knowledge from the knowledge base. The control system can be used to control complex plants described by nonlinear, unstable, dissipative models. In one embodiment, the step-constrained control system is configured to control stepping motors.Type: GrantFiled: July 30, 2002Date of Patent: September 27, 2005Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Sergei V. Ulyanov, Sergei Panfilov, Kazuki Takahashi
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Patent number: 6948729Abstract: A method and a device for slot parking of a mobile vehicle (1), the slot parking (15) includes positioning (19,22), locking (23,25), unlocking (26,27) and realigning (28,29) phases, the method using elements to evaluate available parking space relative to immediate surroundings. The method consists in: retrieving quantitative input values from sensors, which are transformed or not into gradual qualitative input values; determining on the basis of qualitative rules operating instructions which supply gradual qualitative output data and quantitative output data, which are transformed into quantitative output data to control the vehicle actuators. The invention is useful for parking any type of powered vehicles whereof the wheel can be locked on a common axle, and can be used on public roads, private parking lots or production sites of companies.Type: GrantFiled: March 27, 2001Date of Patent: September 27, 2005Assignee: Intellitech (Intelligent Technologies)Inventors: Zyed Zalila, Guillaume Gueydan
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Patent number: 6943512Abstract: The present invention is a control apparatus for controlling an electric power steering system having steering assist force control means for controlling a motor that gives a steering assist force to a steering mechanism relying upon a main torque input value obtained by subjecting a main torque signal from a torque sensor to the A/D conversion, upon a gain-multiplied torque input value obtained by multiplying said main torque signal by a first gain times followed by the A/D conversion and upon a sub-torque signal from said torque sensor, in order to carry out a failsafe function, characterized by the provision of a gain multiplier for multiplying said main torque input value by a second gain times,. and switching means for changing the output of said gain multiplier and said gain-multiplied torque input value over to each other to input it to said steering assist force control means.Type: GrantFiled: January 27, 2003Date of Patent: September 13, 2005Assignee: NSK Ltd.Inventor: Hideyuki Kobayashi
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Patent number: 6941212Abstract: The invention provides a technique for learning a stability factor of a vehicle by which the stability factor of the vehicle can be calculated in response to a state of the vehicle. To this end, a state of the vehicle during traveling is detected, and it is decided based on the detection information whether or not the current traveling state of the vehicle is a stable turning state. If it is decided that the current traveling state of the vehicle is a stable turning state, then the stability factor of the vehicle is calculated in accordance with a predetermined arithmetic operation expression based on a vehicle speed, a steering angle and a yaw rate detected during traveling, and the calculated value is determined as a learned value of the stability factor of the vehicle thereby to determine the stability factor in the current state of the vehicle.Type: GrantFiled: September 29, 2001Date of Patent: September 6, 2005Assignee: Mitsubishi Fuso Truck and Bus CorporationInventor: Kunio Sakata
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Patent number: 6931330Abstract: Methods are provided for monitoring and controlling a chemical mechanical planarization (CMP) process. Relationships between motor torques and CMP process parameters are determined and utilized to provide a basis for monitoring and controlling the CMP process. Motor current measurements obtained during the CMP process are converted to motor torques to provide for use of the relationships in monitoring and controlling the CMP process. The motor current measurements and relationships are also used to determine and monitor a coefficient of friction present during the CMP process.Type: GrantFiled: June 30, 2003Date of Patent: August 16, 2005Assignee: Lam Research CorporationInventors: Jingang Yi, Cangshan Xu
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Patent number: 6901320Abstract: The present invention provides systems and methods of friction compensation in a steer-by-wire system or in a general electric steering system using control, estimation and modeling methodologies. A friction compensator in the steer-by-wire control system produces a friction compensating torque value equal and opposite in sign to the instantaneous friction torque. This compensating friction torque is added to the steering system control signal to eliminate the effects of friction present in the system such that the system performances are improved. The friction compensator produces the compensating friction torque according to one of two schemes: model-based or non-model based. The model-based scheme encompasses a number of different methods including a standard model-based scheme, a disturbance torque observer-based scheme, an adaptive friction compensation scheme, or a model reference adaptive control scheme. The non-model based scheme includes a fuzzy logic scheme.Type: GrantFiled: January 15, 2003Date of Patent: May 31, 2005Assignee: Visteon Global Technologies, Inc.Inventors: Yixin Yao, Behrouz Ashrafi, Ann Hayes Larsen
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Patent number: 6856870Abstract: A power steering system capable of giving a driver no discomfort even when an incoming current instruction value sharply decreases. The power steering system comprises a controller C for determining a solenoid current instruction value SI on the basis of a current instruction value I1 in accordance with a steering angle supplied from a steering angle sensor, a current instruction value I2 in accordance with a steering angular velocity, and a current instruction value in accordance with a vehicle speed. The controller C comprises a delay control section for reducing the rate of decrease only when the incoming current instruction value sharply decreases and outputting the resulting current instruction value.Type: GrantFiled: January 24, 2003Date of Patent: February 15, 2005Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Patent number: 6845310Abstract: A power steering system capable of preventing an unnecessary standby flow produced in high speed travel. A controller C determines a basic current instruction value Id based on a current instruction value I1 in accordance with a steering angle detected by a steering angle sensor 14, a current instruction value I2 in accordance with a steering angular velocity and current instruction values I5, I6 in accordance with a vehicle speed, and adds a standby current instruction value Is to the basic current instruction value Id, and outputs the resultant value of the addition as a solenoid current instruction value SI, and changes the standby current instruction value Is on the basis of the vehicle speed.Type: GrantFiled: January 24, 2003Date of Patent: January 18, 2005Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Publication number: 20040249533Abstract: A vehicle control system includes at least one driver input [(20)], a supervisor [(14)] and at least one sub-system [(18)] controlled by the supervisor. The supervisor assesses the driver input to establish actual driver demand and controls the sub-systems [(18)] accordingly. As a result intuitive driver demand is identified and met.Type: ApplicationFiled: July 8, 2004Publication date: December 9, 2004Inventors: Jonathan Charles Wheals, Mark Ramsbottom
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Patent number: 6799105Abstract: The present invention involves a system and method of controlling a variable steering ratio of a vehicle steer-by-wire system. The variable steering ratio control varies the steering ratio continuously according to steering angle and vehicle speed. The method comprises sensing an actual steering wheel angle and an actual speed of the vehicle and converting the actual steering wheel angle and vehicle speed into values in fuzzy sets based on a steering wheel angle and vehicle speed membership functions with linguistic term labels. The method further includes determining a corresponding degree of membership of the steering wheel angle and vehicle speed. The method further includes inferring a fuzzy road wheel reference angle output value by determining the degree of membership function for the road wheel reference angle using fuzzy rules based on the degrees of steering angle and the vehicle speed. The method further includes converting a fuzzy road wheel angle into an actual road wheel angle.Type: GrantFiled: October 1, 2002Date of Patent: September 28, 2004Assignee: Visteon Global Technologies, Inc.Inventors: Gregory J. Stout, Yixin Yao
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Patent number: 6795763Abstract: The present invention involves a system and method of controlling a vehicle steer-by-wire system to provide the variable and adjustable steering feel for the driver utilizing expert-type fuzzy logic technology. The steering wheel fuzzy logic controller controls the steering wheel torque to produce the variable and adjustable steering feel continuously based on changes in steering wheel angle, road wheel torque and vehicle speed.Type: GrantFiled: October 30, 2002Date of Patent: September 21, 2004Assignee: Visteon Global Technologies, Inc.Inventors: Yixin Yao, Gregory James Stout
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Patent number: 6772055Abstract: The invention concerns a system for generating basis for decisions concerning the behavior of a vehicle and/or of a driver of a vehicle. The system comprises a supervising unit (10) which comprises at least one storage member (12). In the storage member (12) there is a set of rules (14) of a particular kind for how the driver of the vehicle and/or the vehicle shall behave in different situations. The system also comprises a user interface (16) and adaptation means (13) arranged to adapt said set of rules such that at least some of the rules (14) with conclusions (24) belonging thereto are suited to form the basis for decisions concerning the behavior of a vehicle and/or of a driver of a vehicle. The invention also concerns a vehicle and a method of generating basis for decisions concerning the behavior of a vehicle and/or of a driver of a vehicle.Type: GrantFiled: July 2, 2002Date of Patent: August 3, 2004Assignee: Saab ABInventor: Hans-Ove Hagelin
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Publication number: 20040138797Abstract: The present invention provides systems and methods of friction compensation in a steer-by-wire system or in a general electric steering system using control, estimation and modeling methodologies. A friction compensator in the steer-by-wire control system produces a friction compensating torque value equal and opposite in sign to the instantaneous friction torque. This compensating friction torque is added to the steering system control signal to eliminate the effects of friction present in the system such that the system performances are improved. The friction compensator produces the compensating friction torque according to one of two schemes: model-based or non-model based. The model-based scheme encompasses a number of different methods including a standard model-based scheme, a disturbance torque observer-based scheme, an adaptive friction compensation scheme, or a model reference adaptive control scheme. The non-model based scheme includes a fuzzy logic scheme.Type: ApplicationFiled: January 15, 2003Publication date: July 15, 2004Applicant: Visteon Global Technologies, Inc.Inventors: Yixin Yao, Behrouz Ashrafi, Ann Hayes Lersen
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Patent number: 6751539Abstract: In a steering mechanism of steer-by-wire type which includes a first steering unit that is handled by a driver and a second steering unit that steers steered road wheels with the aid of a steering motor, there is employed a control system which input and output detecting sections that detect input and output of the steering motor, a road surface disturbance estimating section that estimates a disturbance of road surface based on both the detected input and output of the steering motor, and a steering reaction force calculating section that, based on the estimated disturbance of road surface, calculates a steering reaction force that is to be applied to a steering wheel of the first steering unit.Type: GrantFiled: September 12, 2002Date of Patent: June 15, 2004Assignee: Nissan Motor Co., Ltd.Inventors: Kenya Uenuma, Hiroshi Mouri
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Publication number: 20040088093Abstract: The present invention involves a system and method of controlling a vehicle steer-by-wire system to provide the variable and adjustable steering feel for the driver utilizing expert-type fuzzy logic technology. The steering wheel fuzzy logic controller controls the steering wheel torque to produce the variable and adjustable steering feel continuously based on changes in steering wheel angle, road wheel torque and vehicle speed. The method comprises receiving an actual steering wheel angle, an actual road wheel angle, an actual road wheel torque, and an actual vehicle speed. The method includes converting the actual input variables into values in fuzzy sets based on their membership functions with linguistic term labels. The method further includes inferring a reaction torque control variable using fuzzy logic inference rules. The method includes converting a fuzzy reaction torque control variable into an actual reaction torque control variable.Type: ApplicationFiled: October 30, 2002Publication date: May 6, 2004Applicant: Visteon Global Technologies, Inc.Inventors: Yixin Yao, Gregory James Stout
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Publication number: 20040064229Abstract: The present invention involves a system and method of controlling a variable steering ratio of a vehicle steer-by-wire system. The variable steering ratio control varies the steering ratio continuously according to steering angle and vehicle speed. The method comprises sensing an actual steering wheel angle and an actual speed of the vehicle and converting the actual steering wheel angle and vehicle speed into values in fuzzy sets based on a steering wheel angle and vehicle speed membership functions with linguistic term labels. The method further includes determining a corresponding degree of membership of the steering wheel angle and vehicle speed. The method further includes inferring a fuzzy road wheel reference angle output value by determining the degree of membership function for the road wheel reference angle using fuzzy rules based on the degrees of steering angle and the vehicle speed. The method further includes converting a fuzzy road wheel angle into an actual road wheel angle.Type: ApplicationFiled: October 1, 2002Publication date: April 1, 2004Applicant: Visteon Global Technologies, Inc.Inventors: Gregory J. Stout, Yixin Yao
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Patent number: 6691010Abstract: The present invention is a control system for controlling movement of a work implement from a dig location to a dump location. The work implement has at least four degrees of freedom defined by a swing joint angle &thgr;swing, a boom joint angle &thgr;boom, a stick joint angle &thgr;stick, and a bucket joint angle &thgr;bucket. In one embodiment, the control system comprises a central processing unit and a memory device. The control system further comprises an initialization module stored on the memory device and adapted to determine specified initial and final joint angles for an initial cycle of the work implement indicative of the specified dig and dump locations, respectively. The control system further comprises a hydraulic valve connected to the central processing unit and to the work implement. The control system further comprises a fuzzy control module stored on the memory device.Type: GrantFiled: November 15, 2000Date of Patent: February 10, 2004Assignee: Caterpillar IncInventor: John R. Gay
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Patent number: 6668219Abstract: An artificial intelligence diagnostic device is provided for performing concentrated management on electric devices and control devices of an automobile using a separate diagnostic central processing unit to diagnose the malfunction of the automobile in real time and for reporting the diagnosis result to a driver through a visual display or a voice.Type: GrantFiled: July 24, 2001Date of Patent: December 23, 2003Assignee: Yu-il Tech. Co., Ltd.Inventors: Chang-sun Hwang, Do-hyoung Kim
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Patent number: 6633783Abstract: Because of the enormous number of neurons and reflex pathways involved in the control of human motion, a comprehensive identification of the structure of the feedback control circuitry is a formidable experimental task. A theoretical approach based on a carefully developed model could shed light on its likely general structure, thereby providing guidance to experimenters. This paper presents a fuzzy logic based control strategy for modeling the human postural dynamics. In particular, we develop a fuzzy controller to coordinate the movement of a three segment sagittal human model to achieve upright posture. The actuation mechanism of the system consists of six muscle like actuators which are co-activated to modulate the stiffness at the joints. Simulation results are presented to illustrate the underlying principles.Type: GrantFiled: December 1, 2000Date of Patent: October 14, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Behzad Dariush, Kikuo Fujimura
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Patent number: 6628210Abstract: A method for preventing a vehicle from deviating from a lane is provided, in which precise determinations of whether a vehicle is deviating from a lane may also be made when driving on curved sections of a road. Using DSRC, which is a system enabling communications between a vehicle and roadside equipment, information of road curvature and lane width is received. This road information and setting information of a camera mounted to the vehicle are then used to determine a lane deviation determination standard angle, which is used in curved sections of the road. A difference between the standard angle and a center value of left and right lane marker angles is compared with a critical value to determine whether the vehicle is deviating from the lane.Type: GrantFiled: December 31, 2001Date of Patent: September 30, 2003Assignee: Hyundai Motor CompanyInventor: Young-Seop Lee