On Split Coefficient Surface (u) Patents (Class 701/73)
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Patent number: 11427253Abstract: The present invention relates to a method for collision avoidance for a host vehicle, the method comprising: detecting a target in the vicinity of the vehicle; determining that the host vehicle is travelling on a collision course with the target; detecting a user initiated steering action for steering the vehicle towards one side of the target; determining a degree of understeering of the host vehicle; when the degree of understeering exceeds a first understeering threshold, controlling a steering control system of the vehicle to counteract the user initiated steering action to thereby reduce the degree of understeering. The invention further relates to an evasive steering system.Type: GrantFiled: September 16, 2019Date of Patent: August 30, 2022Assignee: Volvo Car CorporationInventors: Mikael Riikonen, Derong Yang, Martin Idegren, Mats Jonasson, Rickard Nilsson
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Patent number: 10124809Abstract: A method, arrangement and system are described for estimating one or more vehicle cornering stiffness parameters (cf, cr) in a linear vehicle operating region. The method includes reading sensor data representative of at least vehicle (1) longitudinal velocity (vx), vehicle lateral acceleration (ay), vehicle yaw rate (?z) and vehicle steering angle (?), determining from the read sensor data if the cornering stiffness parameters (cf, cr) are observable, and if so providing an estimate of the cornering stiffness parameters (cf, cr) using a bicycle model that includes a model of tire relaxation dynamics.Type: GrantFiled: February 12, 2016Date of Patent: November 13, 2018Assignee: Volvo Car CorporationInventors: Mikael Thor, Tony Gustafsson
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Patent number: 9020744Abstract: A method of controlling a three-wheeled vehicle comprises: determining a state of a load sensor associated with a portion of vehicle; selecting a first start mass when the load sensor is in a non-loaded state; selecting a second start mass when the load sensor is in a loaded state; determining at least one vehicle parameter during operation of the vehicle; determining a calculated mass based at least in part on the at least one vehicle parameter; determining an effective mass based at least in part on the calculated mass and a selected one of the first and second start masses; defining an output of an electronic stability system of the vehicle based at least in part on the effective mass; and controlling a stability of the vehicle using the output of the electronic stability system.Type: GrantFiled: September 13, 2013Date of Patent: April 28, 2015Assignee: Bombardier Recreational Products Inc.Inventor: Mario Dagenais
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Patent number: 8997919Abstract: A motor-driven steering controller for controlling a steering wheel of a vehicle. The controller includes a steering torque controlling unit, a braking force estimating unit, a right and left braking force difference estimating unit and an assist steering torque providing unit. The steering torque controlling unit controls a steering torque on the steering wheel depending on a steering operation. The braking force estimating unit estimates braking forces to be imposed on wheels of the vehicle. The right and left braking force difference estimating unit estimates difference between the braking forces to be imposed on the right and left wheels each estimated by the braking forces estimating unit. The assist steering torque providing unit provides an assist steering torque for the steering torque controlling unit on the basis of the difference in braking force between right and left wheels estimated by the right and left braking force difference estimating unit.Type: GrantFiled: March 5, 2010Date of Patent: April 7, 2015Assignees: Aisin Seiki Kabushiki Kaisha, Jtekt Corporation, Advics Co., Ltd.Inventors: Yoshiyuki Yasui, Wataru Tanaka, Yuji Muragishi, Eiichi Ono, Katsuhiro Asano, Minekazu Momiyama, Hiroaki Kato, Kenji Asano
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Patent number: 8914213Abstract: A computer program product, a method and an apparatus for detection of road surface friction coefficient for vehicle stability control are disclosed. The computer program product comprises stored instructions for receiving detected vehicle parameters from a vehicle; calculating a lookup value based on the detected vehicle parameters, the calculating comprising an recursive least square estimation; retrieving a road surface friction coefficient from a lookup table by matching the calculated lookup value to the road surface friction coefficient stored in the lookup table; calculating adjustments to the vehicle using the road surface friction coefficient; and outputting the adjustments to a vehicle control system for execution.Type: GrantFiled: March 12, 2013Date of Patent: December 16, 2014Assignee: Eaton CorporationInventors: Christian Thomas Chimner, John Allen Grogg
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Patent number: 8868310Abstract: A computer program product, a method and an apparatus for detection of road surface friction coefficient for vehicle stability control are disclosed. The computer program product comprises stored instructions for receiving detected vehicle parameters from a vehicle; calculating a lookup value based on the detected vehicle parameters, the calculating comprising an recursive least square estimation; retrieving a road surface friction coefficient from a lookup table by matching the calculated lookup value to the road surface friction coefficient stored in the lookup table; calculating adjustments to the vehicle using the road surface friction coefficient; and outputting the adjustments to a vehicle control system for execution.Type: GrantFiled: March 12, 2013Date of Patent: October 21, 2014Assignee: Eaton CorporationInventors: Christian Thomas Chimner, John Allen Grogg
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Patent number: 8838355Abstract: An operation quantity detector detects an operation quantity. Hydraulic passage systems provide connection between hydraulic chambers of a tandem type master cylinder and wheel cylinders. A hydraulic pressure source in the hydraulic passages can pressurize the hydraulic passages based on the operation quantity. Cutoff valves each is installed in each of the hydraulic passages, between the master cylinder and the hydraulic pressure source. The hydraulic pressure detectors detect hydraulic pressures of the hydraulic passages. In the opening command state, a first mutual diagnosis based on the hydraulic pressures and the operation quantity and a second mutual diagnosis based on the hydraulic pressures are performed. In the closing command state, the first and second mutual diagnoses are performed. A failure is detected in the cutoff valves and the hydraulic pressure detecting units based on results of the first and second mutual diagnoses in the opening closing command states.Type: GrantFiled: January 6, 2011Date of Patent: September 16, 2014Assignee: Honda Motor Co., Ltd.Inventor: Yuki Ito
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Patent number: 8838357Abstract: Disclosed is a braking force distribution control device for a vehicle which has a braking apparatus capable of individually controlling braking forces of the wheels as required. Front or rear wheels having higher braking force sharing rate being referred to control reference wheels and the front or rear wheels having lower braking force sharing rate are referred to control object wheels. A difference value between braking slip index values of the left and right wheels of said control object wheels is referred to a reference difference value. A braking force distribution control is executed on the control object wheels so that the magnitude relationship in wheel speeds of the left and right wheels of the control object wheels is converse to that of the left and right wheels of the control reference wheels.Type: GrantFiled: June 3, 2011Date of Patent: September 16, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yoshinori Watanabe
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Patent number: 8831852Abstract: In an integrated controller for a vehicle, a main control unit determines whether a road ahead is a split-? road based on captured images obtained by left and right CCD cameras, and, if so, increases a braking intervention distance correction gain for correcting braking intervention distances set by a collision prevention control unit. The collision prevention control unit performs collision prevention control at a brake timing earlier than usual using the braking intervention distances corrected by the correction gain. Furthermore, when the road ahead is determined to be a split-? road, the main control unit decreases a target torque correction gain for correcting a target torque set by an engine control unit to prevent the vehicle from becoming unstable as a result of a yaw moment acting on the vehicle generated by a generated driving force due to a difference in friction coefficient ? between left and right road surfaces.Type: GrantFiled: September 21, 2011Date of Patent: September 9, 2014Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Masayuki Yajima, Tasuku Maruyama
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Patent number: 8775040Abstract: A vehicle control system obtains an index indicating a running condition of a vehicle on the basis of a vehicle parameter indicating a motion of the vehicle and then sets a running characteristic of the vehicle in accordance with the index. The vehicle control system includes a noise reduction unit that is configured to obtain the index on the basis of the vehicle parameter of which a fluctuating component that fluctuates because of a driver's driving operation or the influence of a running road surface.Type: GrantFiled: August 17, 2010Date of Patent: July 8, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shin Noumura, Ken Koibuchi, Keisuke Takeuchi, Toshio Tanahashi, Hiroyuki Hanamura, Yoji Takanami, Norimi Asahara, Kaiji Itabashi
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Patent number: 8751125Abstract: A vehicle control apparatus includes an accelerator-manipulated-amount detecting section configured to detect a manipulated amount of accelerator; a braking-force generating section configured to generate a braking force of the vehicle; a driving-force generating section configured to generate a driving force of the vehicle; a control unit including a vehicle-body speed calculating section configured to calculate an actual vehicle-body speed. The control unit is configured to perform a normal control mode which generates a driving force corresponding to the accelerator manipulated amount, and to perform a speed control mode which calculates a target vehicle-body speed based on the accelerator manipulated amount and which controls the braking-force generating section and the driving-force generating section so as to bring the actual vehicle-body speed closer to the target vehicle-body speed.Type: GrantFiled: September 7, 2010Date of Patent: June 10, 2014Assignee: Hitachi Automotive Systems, Ltd.Inventor: Kazunori Ozaki
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Patent number: 8718914Abstract: Disclosed is a device and method of providing a driver with eco-driving information. More specifically, the disclosed method and device induces a driver to operate a vehicle in an eco-friendly manner by computing for and displaying to the driver a fuel efficiency oriented vehicle speed that maximizes the vehicle's driving distance based on the vehicle's current weight and electrical load.Type: GrantFiled: June 15, 2012Date of Patent: May 6, 2014Assignee: Hyundai Motor CompanyInventors: Jae Woong Kim, Jae Hyun Park, Joon Hyung Park, Sang Hun Kim
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Publication number: 20140114547Abstract: A computer program product, a method and an apparatus for detection of road surface friction coefficient for vehicle stability control are disclosed. The computer program product comprises stored instructions for receiving detected vehicle parameters from a vehicle; calculating a lookup value based on the detected vehicle parameters, the calculating comprising an recursive least square estimation; retrieving a road surface friction coefficient from a lookup table by matching the calculated lookup value to the road surface friction coefficient stored in the lookup table; calculating adjustments to the vehicle using the road surface friction coefficient; and outputting the adjustments to a vehicle control system for execution.Type: ApplicationFiled: March 12, 2013Publication date: April 24, 2014Applicant: Eaton CorporationInventors: Christian Thomas Chimner, John Allen Grogg
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Patent number: 8660769Abstract: A vehicle motion control system which is to be installed on a vehicle having a single front wheel, a right wheel and a left wheel. The control system includes: (a) a front-wheel steering device configured to steer the front wheel; (b) a braking device configured to apply a braking force to each of the wheels; and (c) a controlling device including a braking-force controlling portion configured to control the braking force that is to be applied to each of the wheels.Type: GrantFiled: June 25, 2010Date of Patent: February 25, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuichi Onoda, Yutaka Ohnuma
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Patent number: 8630795Abstract: Method and arrangement for setting a speed limit for vehicle travelling on a road includes monitoring conditions of the road, determining a speed limit for travel of vehicles on the road based on the monitored conditions, and transmitting the determined speed limit to the vehicles to thereby notify operators of the vehicles of the determined speed limit. Monitoring conditions of the road may entail monitoring weather conditions around the road, monitoring visibility for operators of the vehicles on the roads, monitoring traffic on the road, monitoring accidents on the road or emergency situations of vehicles on the road and/or monitoring the speed of vehicles travelling on the road and a distance between adjacent vehicles.Type: GrantFiled: April 24, 2012Date of Patent: January 14, 2014Assignee: American Vehicular Sciences LLCInventors: David S. Breed, Wendell C. Johnson, Wilbur E. DuVall
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Patent number: 8577588Abstract: A vehicle comprising a seat defining a driver seat portion and a passenger seat portion, an electronic stability system, adapted to receive inputs from a load sensor, a wheel rotation sensor and a lateral acceleration sensor, the electronic stability system adapted to provide outputs to at least one of the brake system for braking the vehicle, and the engine control unit to change the power output transmitted to the wheels by the engine, the electronic stability system using a first calibration to determine the outputs when the load sensor is in a non-loaded state and a second calibration to determine the outputs when the load sensor is in a loaded state.Type: GrantFiled: July 19, 2012Date of Patent: November 5, 2013Assignee: Bombardier Recreational Products Inc.Inventor: Mario Dagenais
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Patent number: 8571732Abstract: Provided is a vehicle skid control device that avoids a skid erroneous judgment in a high revolution range of a motor. The vehicle skid control device detects the number of revolutions of the motor. When the number of revolutions of the motor is equal to or larger than a predetermined threshold value Nm, the vehicle skid control device prohibits a skid judgment. When the number of revolutions of the motor is smaller than the predetermined threshold value Nm, the vehicle skid control device permits the skid judgment. When the number of revolutions of the motor is equal to or larger than the threshold value Nm, the skid judgment is prohibited. Accordingly, it is possible to avoid the skid erroneous judgment in the high revolution range with the number of revolutions equal to or larger than Nm.Type: GrantFiled: December 11, 2008Date of Patent: October 29, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Michio Yoshida, Kenji Umayahara, Tomoyuki Nishida
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Publication number: 20130245909Abstract: A vehicle brake hydraulic pressure control apparatus includes an adding section and a control differential pressure setting section. The adding section adds a feedback differential pressure obtained by executing a PI operation in accordance with a yaw rate deviation which is a difference between a target yaw rate being set to a value at which a vehicle turns to a higher coefficient-of-friction road side and an actual yaw rate and a feedforward differential pressure obtained by adding (i) a differential pressure based on a steering angle and (ii) a differential pressure based on a velocity of a vehicle body and the target yaw rate. The control differential pressure setting section sets a control differential pressure based on a value obtained by the adding section, after a predetermined time elapses since start of differential pressure control.Type: ApplicationFiled: March 12, 2013Publication date: September 19, 2013Applicant: NISSIN KOGYO CO., LTD.Inventors: Tomonori HIROSE, Keisuke WAKIZAKA
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Patent number: 8532896Abstract: A method of and system for detecting absolute acceleration along various axes relative to a desired movement vector while moving relative to a gravity source includes steps of determining a vertical acceleration, perpendicular to the desired movement vector and substantially anti-parallel to a gravitational acceleration due to the gravity source; determining a longitudinal acceleration, parallel to the desired movement vector and to output at vertical acceleration signal and a longitudinal acceleration signal; determining an inclination of the desired movement vector relative to the gravitational acceleration; and processing the vertical acceleration signal, the longitudinal acceleration signal, and the inclination signal to produce an absolute vertical acceleration signal and an absolute longitudinal acceleration signal.Type: GrantFiled: June 21, 2007Date of Patent: September 10, 2013Assignee: Vision Works IP CorporationInventors: Alfred S. Braunberger, Beau M. Braunberger
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Publication number: 20130226429Abstract: A braking force control device can control braking forces of the respective wheels of a vehicle, suppresses an increase of the braking force of a first wheel that is a wheel having a relatively large slip amount in a pair of right/left wheels and increases the braking force of a second wheel that is a wheel having a relatively small slip amount. The braking force control device may suppress the increase of the braking force of the first wheel before the friction coefficient of a road surface to the first wheel reaches a peak and when the friction coefficient is in the vicinity of the peak. It is preferable to suppress the increase of the braking force of the first wheel by holding the braking force of the first wheel.Type: ApplicationFiled: November 2, 2011Publication date: August 29, 2013Applicants: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Satoshi Udaka, Noritaka Yamada, Hideyuki Aizawa, Akifumi Doura
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Publication number: 20130207453Abstract: Proposed is a technique for operating a hydraulic motor vehicle brake system in an operating situation which requires the formation of a hydraulic pressure difference at opposite wheel brakes of a vehicle axle. Here, each wheel brake is assigned a first slip regulating valve device for decoupling the respective wheel brake from a hydraulic pressure generator, and a second slip regulating valve device for dissipating hydraulic pressure at the respective wheel brake.Type: ApplicationFiled: July 5, 2011Publication date: August 15, 2013Applicant: LUCAS AUTOMOTIVE GMBHInventor: Josef Knechtges
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Publication number: 20130184956Abstract: A wheel deceleration calculating sections individually calculate, as negative values, wheel decelerations of front and rear wheels. If, at a time when the antilock braking control for at least one of the right and left front wheels is started or at a time when the antilock braking control for at least one of the right and left rear wheels is started, (i) a maximum value of the wheel decelerations calculated by the wheel deceleration calculating sections is equal to or larger than a first predetermined value and (ii) a difference between the wheel decelerations of the right and left front wheels or the right and left rear wheels which are in an antilock braking control state is equal to or larger than a second predetermined value, a split road determining section determines that road surfaces constitute a split road.Type: ApplicationFiled: December 21, 2012Publication date: July 18, 2013Applicant: NISSIN KOGYO CO., LTD.Inventor: Nissin Kogyo Co,. Ltd.
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Publication number: 20130184955Abstract: A vehicle brake hydraulic pressure control apparatus includes a hydraulic pressure adjusting unit, a split road determining section, a differential pressure control section, and a hydraulic pressure adjusting and driving section. The hydraulic pressure adjusting unit individually adjusts brake fluid pressures acting on wheel brakes for wheels. The split road determining section determines whether road surfaces which the wheels are in contact with constitute a split road. In a state where the split road determining section determines during execution of antilock braking control that the road surfaces constitute the split road, the differential pressure control section determines command pressures for the wheel brakes so that differential pressures between the brake fluid pressures of the right and left wheel brakes are equal to or less than a permissible differential pressure.Type: ApplicationFiled: December 21, 2012Publication date: July 18, 2013Applicant: NISSIN KOGYO CO., LTD.Inventor: Nissin Kogyo Co., Ltd.
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Patent number: 8483926Abstract: Apparatus for estimating a ground contact surface gripping characteristic of a vehicle wheel of a vehicle comprises an input section and an output section. The input section sets an input representing a ratio of a wheel force acting on the vehicle wheel in the ground contact surface, and a wheel slipping degree of the vehicle wheel. The output section determines, from the input, an output representing a grip characteristic parameter indicative of the gripping characteristic of the vehicle wheel.Type: GrantFiled: April 16, 2008Date of Patent: July 9, 2013Assignee: Nissan Motor Co., Ltd.Inventors: Yuuki Shiozawa, Masaaki Nawano, Hiroshi Mouri, Masatsugu Yokote, Masahiro Kubota, Kenichi Seki
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Publication number: 20130144500Abstract: Disclosed is a braking force distribution control device for a vehicle which has a braking apparatus capable of individually controlling braking forces of the wheels as required. Front or rear wheels having higher braking force sharing rate being referred to control reference wheels and the front or rear wheels having lower braking force sharing rate are referred to control object wheels. A difference value between braking slip index values of the left and right wheels of said control object wheels is referred to a reference difference value. A braking force distribution control is executed on the control object wheels so that the magnitude relationship in wheel speeds of the left and right wheels of the control object wheels is converse to that of the left and right wheels of the control reference wheels.Type: ApplicationFiled: June 3, 2011Publication date: June 6, 2013Inventor: Yoshinori Watanabe
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Patent number: 8437907Abstract: In a method for determining a roadway state (STATE) of a roadway on which a vehicle (10) is travelling which has at least one wheel (14) and an acceleration sensor (24) which is assigned to the wheel (14), in order to determine a vertical component of an acceleration of the wheel (14), a characteristic value which is representative of the roadway state (STATE) is determined as a function of a measured signal (AC_VERT) of the acceleration sensor (18).Type: GrantFiled: October 31, 2007Date of Patent: May 7, 2013Assignee: Continental Automotive GmbHInventors: Ning Bian, Celine Gamulescu, Andreas Mayer, Thomas Schweiger
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Publication number: 20130103279Abstract: One embodiment provides a vehicle brake hydraulic controller including: an antilock braking controlling module configured to perform an antilock braking control in which a brake hydraulic pressure applied to wheel brakes is reduced under the condition that a slip-related amount has reached a pressure reduction threshold value; and a turning judging module configured to judge whether a vehicle is turning based on a steering angle, wherein, when the antilock braking control is performed and in the case that the turning judging module judges that the vehicle is turning, the antilock braking controlling module performs a turning pressure reduction control so as to: change the pressure reduction threshold values to be more easily reached by the slip-related amount than at the time of straight running; and change the pressure reduction amounts to be larger than that at the time of straight running.Type: ApplicationFiled: October 17, 2012Publication date: April 25, 2013Applicant: NISSIN KOGYO CO., LTD.Inventor: NISSIN KOGYO CO., LTD.
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Patent number: 8428841Abstract: A vehicle motion control device is provided. The vehicle motion control device includes a steering angle deviation calculating unit which calculates a steering angle deviation of the vehicle, a frictional coefficient calculating unit which calculates each of road surface frictional coefficients for a traveling road surface of four wheels; and a pressure increasing and reducing controlling unit which performs a split control including applying a pressure increasing limitation of a pressure increasing control in an anti-skid control to a front wheel at a side of the traveling road surface having higher road surface frictional coefficient between the right and left wheels based on an absolute value of the steering angle deviation such that a pressure increasing gradient in the pressure increasing control is smaller as the absolute value is larger.Type: GrantFiled: September 30, 2010Date of Patent: April 23, 2013Assignee: Advics Co., Ltd.Inventors: Ken Kudo, Masato Terasaka, Takuo Kitano
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Patent number: 8392089Abstract: A method of estimating the available grip margin of a tire of a vehicle rolling on a ground involves: estimating a quantity Rslip ca, i.e., the ratio of the slip contact area and the total contact area of the tire on the ground; determining, in a signal processing unit, the grip potential used P?,used and/or the available grip margin of the tire P?,avail from the quantity and pre-established data corresponding to the type of the tire, where P?,avail=1?P?,used; and recording in a memory the grip potential used and/or the available grip margin of the tire.Type: GrantFiled: July 2, 2008Date of Patent: March 5, 2013Assignee: Michelin Recherche et Technique S.A.Inventor: Frederic Spetler
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Patent number: 8342616Abstract: An object of the invention is to reduce an influence of deviation in pressure increasing performance, which would be caused by individual differences of pressure increase valves, so that a desired braking force may be obtained. A moderate pressure increasing operation is carried out for wheel cylinder pressure of a wheel, which is on a high ?-road, wherein a demand differential pressure for a pressure increase valve is set at a first target pressure for a first time period and then switched to a second target pressure for a second time period. The influence of the deviation may be absorbed during the moderate pressure increasing operation, so that a difference of wheel cylinder pressure between front left and front right wheels may be reduced.Type: GrantFiled: April 21, 2010Date of Patent: January 1, 2013Assignee: Advics Co., Ltd.Inventor: Mototsugu Sawada
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Patent number: 8340865Abstract: The present invention provides a vehicle wheel spin control apparatus that, when it is determined that a wheel spin occurs, reduces engine torque to prevent the wheel spin, including: detecting driving control information and information on the state of a vehicle and determining whether basic conditions required to perform engine torque limit control to prevent the wheel spin are satisfied; when the basic conditions are satisfied, calculating a speed variation and the speed gradient value, and comparing the speed gradient value with a predetermined speed gradient value to determine whether a spin occurs; when it is determined that the spin occurs, using a torque gradient map set according to the current engine torque to perform the engine torque limit control; and when the vehicle speed is reduced by the engine torque limit control and cancellation conditions are satisfied, canceling the engine torque limit control and returning to normal control.Type: GrantFiled: December 28, 2007Date of Patent: December 25, 2012Assignee: Hyundai Motor CompanyInventor: Hyungsoo Lee
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Patent number: 8260535Abstract: A vehicle comprising a seat defining a driver seat portion and a passenger seat portion, an electronic stability system, adapted to receive inputs from a load sensor, a wheel rotation sensor and a lateral acceleration sensor, the electronic stability system adapted to provide outputs to at least one of the brake system for braking the vehicle, and the engine control unit to change the power output transmitted to the wheels by the engine, the electronic stability system using a first calibration to determine the outputs when the load sensor is in a non-loaded state and a second calibration to determine the outputs when the load sensor is in a loaded state.Type: GrantFiled: September 28, 2007Date of Patent: September 4, 2012Assignee: Bombardier Recreational Products Inc.Inventor: Mario Dagenais
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Patent number: 8249790Abstract: It is predicted whether a spin amount is tending to diverge and a vehicle is tending to become unstable, or the spin amount is tending to converge and the vehicle is tending to become stable. When the convergent tendency is predicted, a correction to reduce the spin amount is performed. As a result, the performance of a braking force control can be made difficult when the spin amount is tending to converge. Thus, it is possible to prevent an anti-spin control from being performed when there is actually no need to perform the anti-spin control, such as when the vehicle posture is correcting.Type: GrantFiled: June 3, 2008Date of Patent: August 21, 2012Assignee: Advics Co., Ltd.Inventor: Kazuhiro Kato
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Patent number: 8239111Abstract: An driving assist control unit controls actuators such as a front wheel steering device, an accelerator pedal mechanism, an alarm lamp. The control units estimates permissible tire-force being capable of acting on the vehicle tire on the basis of road-surface friction coefficient and ground load of the tire, and then calculates tire-force margin by subtracting current tire-force currently acting on the tire, such as total driving force and lateral force, from the permissible tire-force. The control unit then controls steering reaction force of the front wheel steering device, reaction force of the accelerator pedal, and flashing frequency of the alarm lamp in accordance with the magnitude of the tire-force margin, respectively.Type: GrantFiled: March 3, 2008Date of Patent: August 7, 2012Assignee: Fuji Jukogyo Kabushiki KaishaInventor: Koji Matsuno
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Patent number: 8231183Abstract: A traction control method is provided for dynamically maintaining safe driving traction between a tire (12) and a driving surface in a decelerating motor vehicle (10) through a modulated braking device (18, 24). The method monitors the acceleration response of a tire (12) to a torque change induced by modulation of a braking device (18, 24). Observation of the acceleration profile over time is used to determine whether additional braking torque or pressure can be applied without causing the tire (12) to slip. A Traction Reserve value is computed through observing the acceleration trend of the tire (12) over time after a single change in torque, whether that change is accomplished as an increase or a decrease.Type: GrantFiled: February 19, 2009Date of Patent: July 31, 2012Assignee: Ford Global TechnologiesInventor: John Patrick Joyce
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Patent number: 8224546Abstract: A second threshold value which is smaller than a first threshold value is set as a threshold value for starting pressure decrease control of a wheel on a high ? road surface side when a select low control is employed. Then, if a slip ratio of the wheel on the high ? road surface side exceeds the second threshold value, a pressure decrease control in ABS control is started even if the slip ratio of a wheel on a low ? road surface side does not exceed the first threshold value. Accordingly, it is possible to prevent the vehicle running state from becoming unstable due to the wheel speed of the wheel on the high ? road surface side from decreasing with respect to the vehicle speed.Type: GrantFiled: December 1, 2005Date of Patent: July 17, 2012Assignee: Advics Co., Ltd.Inventor: Masato Terasaka
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Patent number: 8219308Abstract: An engine-propelled monowheel vehicle comprises two wheels, close together, that circumscribe the remainder of the vehicle. When the vehicle is moving forward, the closely spaced wheels act as a single wheel, and the vehicle turns by leaning the wheels. A single propulsion system provides a drive torque that is shared by the two wheels. A separate steering torque, provided by a steering motor, is added to one wheel while being subtracted from the other wheel, enabling the wheels to rotate in opposite directions for turning the vehicle at zero forward velocity. The vehicle employs attitude sensors, for sensing roll, pitch, and yaw, and an automatic balancing system. A flywheel in the vehicle spins at a high rate around a spin axis, wherein the spin axis is rotatable with respect to the vehicle's frame. The axis angle and flywheel spin speed are continually adjustable to generate torques for automatic balancing.Type: GrantFiled: February 2, 2010Date of Patent: July 10, 2012Inventor: Karl F. Leeser
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Patent number: 8204667Abstract: A method for controlling an antilock brake system on a vehicle, the method comprising calculating a prediction of tire normal forces and modifying a brake torque applied to a brake based on the predicted tire normal forces. The prediction of tire normal forces may be calculated using predicted longitudinal forces or estimates of longitudinal forces that are obtained by predicting a master-cylinder pressure.Type: GrantFiled: March 17, 2009Date of Patent: June 19, 2012Assignee: Ford Global TechnologiesInventor: John Patrick Joyce
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Publication number: 20120078483Abstract: In an integrated controller for a vehicle, a main control unit determines whether a road ahead is a split-? road based on captured images obtained by left and right CCD cameras, and, if so, increases a braking intervention distance correction gain for correcting braking intervention distances set by a collision prevention control unit. The collision prevention control unit performs collision prevention control at a brake timing earlier than usual using the braking intervention distances corrected by the correction gain. Furthermore, when the road ahead is determined to be a split-? road, the main control unit decreases a target torque correction gain for correcting a target torque set by an engine control unit to prevent the vehicle from becoming unstable as a result of a yaw moment acting on the vehicle generated by a generated driving force due to a difference in friction coefficient ? between left and right road surfaces.Type: ApplicationFiled: September 21, 2011Publication date: March 29, 2012Applicant: Fuji Jukogyo Kabushiki KaishaInventors: Masayuki Yajima, Tasuku Maruyama
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Patent number: 8126625Abstract: A vehicle drive assist apparatus for assisting in driving a vehicle by varying drive torque of wheels that includes: a torque-up mechanism increasing the drive torque; a step detecting mechanism detecting a step that may exist on a road surface in a traveling direction of the vehicle; and a switching mechanism switching a status of control between a first status in which the torque-up mechanism is permitted to operate and a second status in which the torque-up mechanism is restricted to operate, wherein the switching mechanism forms the first status if the step is detected by the step detecting mechanism.Type: GrantFiled: February 18, 2008Date of Patent: February 28, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yasushi Makino, Hideyuki Iwakiri, Yuuichi Kubota, Tomohiko Endo, Yukiko Kawabata, Miyuki Omori, Kiyotaka Moriizumi
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Patent number: 8116942Abstract: A steering angle control apparatus for a vehicle includes a first calculating means calculating a longitudinal force, a second calculating device calculating a longitudinal force difference between at least one of right side wheels and at least one of left side wheels based on the longitudinal force, a third calculating device calculating a contribution rate of front wheels at a steering angle control and a contribution rate of rear wheels at the steering angle control, a fourth calculating device calculating a front wheel correction steering angle and a rear wheel correction steering angle based on the contribution rate of the front wheel, the contribution rate of the rear wheel, and a state quantity including the longitudinal force difference, and a driving device outputting a control command value based on the front wheel correction steering angle and the rear wheel correction steering angle.Type: GrantFiled: November 19, 2007Date of Patent: February 14, 2012Assignee: Advics Co., Ltd.Inventors: Yoshiyuki Yasui, Hiroaki Aizawa
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Publication number: 20120029783Abstract: A road surface friction coefficient estimating device includes a means which finds a first estimated value Mnsp_estm of an external force to be compared (S102 to S116, S118-2), a means which finds a second estimated value Mnsp_sens (S118-1), and a plurality of increasing/decreasing manipulated variable determining means 34_k, each of which determines the increasing/decreasing manipulated variable ??_k of the friction coefficient estimated value on the basis of the first estimated value Mnsp_estm and the second estimated value Mnsp_sens, and updates the friction coefficient estimated value according to ??_k. The increasing/decreasing manipulated variable determining means 34—1 and 34—2 determine ??—1 and ??—2 according to a deviation in filtering value between the first estimated value and the second estimated value, and the increasing/decreasing manipulated variable determining means 34—3 determines ??—1 according to the deviation between the first estimated value and the second estimated value.Type: ApplicationFiled: March 26, 2010Publication date: February 2, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Toru Takenaka, Hiroyuki Urabe, Yoshihiro Mori
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Patent number: 8068967Abstract: To determine an inhomogeneous roadway in ?-split situation during active ABS control and active yaw torque control (YTC) of a front wheel (HM-wheel) on the high-coefficient-of-friction side, it is arranged that at least the following conditions must be satisfied before the ?-split situation is flagged: a) a front wheel (LM wheel) undergoes ABS control in a pressure reduction phase; a1) the LM front wheel is in the first ABS control cycle; b) the LM front wheel exhibits a deceleration exceeding a defined threshold; c) the locking pressure level of the LM front wheel is lower than a defined threshold; d) the front wheel on the high-coefficient-of-friction side (HM wheel) exhibits a filtered deceleration that is lower than a defined threshold; e) the vehicle deceleration calculated by ABS is lower than a defined threshold.Type: GrantFiled: September 14, 2006Date of Patent: November 29, 2011Assignee: Continental Teves AG & Co. OHGInventors: Christof Schütz, Yann Andrè, Robert Gutwein
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Patent number: 8060275Abstract: An on-board diagnostic system of a vehicle comprises disabling diagnostic operation, such as a misfire monitor, based on road roughness. In one example, the disabling of the diagnostic operation is based on brake actuation and degradation of an anti-lock braking system.Type: GrantFiled: January 19, 2007Date of Patent: November 15, 2011Assignee: Ford Global Technologies, LLCInventors: Jahan Asgari, Timothy Feldkamp, Craig Stephens, Moses Fridman, Davor Hrovat, Arthur Varady, Mitch McConnell
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Patent number: 8050839Abstract: A vehicle behavior detection apparatus can accurately detect an unstable state of a vehicle without making an incorrect determination even if a travel environment of the vehicle is abnormal. The apparatus includes a road surface reaction torque detecting unit that detects a road surface reaction torque which a tire of the vehicle receives from a road surface, a steering angle detecting unit that detects a steering angle of the vehicle, a vehicle speed detecting unit that detects a speed of the vehicle, a standard road surface reaction torque calculating unit that calculates a standard road surface reaction torque from the steering angle and the vehicle speed, a vehicle behavior state detecting unit that detects the unstable state of the vehicle, and a vehicle behavior detection inhibiting unit that invalidates the vehicle behavior state detecting unit based on the road surface reaction torque and the standard road surface reaction torque.Type: GrantFiled: January 16, 2009Date of Patent: November 1, 2011Assignee: Mitsubishi Electric CorporationInventors: Kazuo Hitosugi, Takanori Matsunaga, Hideyuki Tanaka
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Patent number: 8050818Abstract: A roll stiffness control apparatus of a vehicle, which includes a controller that estimates a remaining capacity of front wheels to generate a lateral force and a remaining capacity of rear wheels to generate a lateral force, and that sets a roll stiffness distribution ratio between the front wheels and the rear wheels so as to reduce a difference between the remaining capacity of the front wheels to generate a lateral force and the remaining capacity of the rear wheels to generate a lateral force.Type: GrantFiled: June 17, 2005Date of Patent: November 1, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yuichi Mizuta
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Patent number: 8036793Abstract: A steering control system is provided for a vehicle with a steered wheel. The vehicle includes a control member that maneuvers within a range between leftward and rightward stops, and that delivers a requested steering signal. The steering control system includes: an actuator that acts on a steering angle of a steered wheel, and a controller that determines a control angle for controlling the actuator to steer the vehicle. The controller includes: a first unit that determines, according to the vehicle's speed and a parameter characteristic of the vehicle's equilibrium, a maximum steering angle on a steered wheel of an equivalent bicycle model of the vehicle, a second unit that determines a gearing-down ratio according to the range of the control member and the maximum steering angle, and a third unit that determines a steering angle according to the gearing-down ratio and the requested steering signal.Type: GrantFiled: March 24, 2006Date of Patent: October 11, 2011Assignee: Michelin Recherche Et Technique S.A.Inventors: Thierry Auguet, Marc Sebe
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Patent number: 8024091Abstract: An FB distribution rule 20 determines an actual vehicle actuator operation control input and a vehicle model operation control input such that a difference between a reference state amount determined by a vehicle model 16 and an actual state amount of an actual vehicle 1 (a state amount error) approximates to zero, and the control inputs are used to operate an actuator device 3 of the actual vehicle 1 and the vehicle model 16. In the FB distribution law 20, when an actual vehicle feedback required amount based on the state amount error exists in a dead zone, then an actual vehicle actuator operation control input is determined by using the required amount as a predetermined value. A vehicle model manipulated variable control input is determined such that a state amount error is brought close to zero, independently of whether an actual vehicle feedback required amount exists in a dead zone.Type: GrantFiled: December 21, 2006Date of Patent: September 20, 2011Assignee: Honda Motor Co., Ltd.Inventors: Toru Takenaka, Takayuki Toyoshima, Hiroyuki Urabe, Hiroshi Kono
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Patent number: 7917272Abstract: In deceleration control apparatus and method for an automotive vehicle, a deceleration control is performed in accordance with a turning travel situation of the vehicle; and an engine throttle opening angle is controlled gradually in a closure direction at a preset variation degree.Type: GrantFiled: January 27, 2009Date of Patent: March 29, 2011Assignee: Nissan Motor Co., Ltd.Inventors: Tatsuya Suzuki, Genpei Naitou, Shinji Matsumoto, Tomohiro Jimbo
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Patent number: 7860623Abstract: A process for increasing the stability of a vehicle upon acceleration on a roadway with a non-homogenous coefficient of friction, whereby a drive wheel is acted on by a braking force on a side with a low coefficient of friction by means of a drive slip regulation. A value (pASR) is determined which corresponds to the braking force (FB,ASR) set by the drive slip regulation (ASR). The value determined (pASR) is used for the determination of a disrupting yaw momentum (MZ), and a control portion (??Z) of a supplemental steering angle (??) is determined in dependence on the disrupting yaw momentum (MZ). An apparatus for the implementation of the process is also provided.Type: GrantFiled: March 15, 2005Date of Patent: December 28, 2010Assignee: Continental Teves AG & Co. oHGInventors: Urs Bauer, Georg Roll, Schahrad Schafiyha, Stephan Capellaro, Michael Gille, Matthias Muntu