Fail-safe System Patents (Class 701/43)
  • Patent number: 10315689
    Abstract: A correction circuit receives a steering torque and an electric signal indicative of an operating state of a clutch. The correction circuit selectively uses a first correction value and a second correction value in accordance with the operating state of the clutch. The first correction value is set to correct deviation of the steering torque relative to its zero point when an exciting coil of the clutch is not energized. The second correction value is set to correct deviation of the steering torque relative to its zero point, caused by magnetic flux generated by energization of the exciting coil of the clutch. Adding the first correction value or the second correction value to the steering torque in accordance with the operating state of the clutch suitably corrects deviation of the steering torque relative to its zero point in accordance with the operating state of the clutch.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: June 11, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Takashi Kodera
  • Patent number: 10315692
    Abstract: Provided is a control device for a rotary machine including: a power feed unit configured to feed electric power in accordance with a power feed command to a rotary machine; a rotation-state detecting unit configured to detect a rotation state of the rotary machine; a torque detecting unit configured to detect an output torque output from the rotary machine; an abnormality determining unit configured to determine an abnormality in the rotation-state detecting unit or the torque detecting unit; and an excitation-command generating unit configured to generate an excitation command for oscillating the rotary machine, in which the power feed command is generated based at least on the excitation command, and the abnormality determining unit is configured to determine the abnormality in the detecting units based on a response of the rotation state and a response of the output torque to the excitation command.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: June 11, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Kezobo, Yoshihiko Kimpara, Akira Furukawa
  • Patent number: 10300940
    Abstract: An electric power steering apparatus that can suppress deterioration of steering feeling by changing a current command value of a normal system in motor control by two systems when an abnormality occurs in any of the systems. The steering apparatus calculates a current command value to a motor having two-system motor windings for each system, comprises a current command value adjusting section that calculates the current command value by using a steering assist command value and a compensation current command value.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: May 28, 2019
    Assignee: NSK LTD.
    Inventor: Takahiro Tsubaki
  • Patent number: 9821836
    Abstract: Restriction values (upper limit and lower limit) for an assist control amount are set individually for each of state amounts including steering torque ? used to compute the assist control amount. A value obtained by summing such restriction values is set as a final restriction value for the assist control amount. Even though the assist control amount with an abnormal value is computed, the assist control amount is restricted to an appropriate value by the final restriction value. In addition, a transition is made from a primary assist control amount which is restricted to a secondary assist control amount computed separately from the primary assist control amount at the timing when a certain time elapses since the assist control amount is restricted. As the steering torque ? is increased, the speed of transition from the primary assist control amount to the secondary assist control amount is increased.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: November 21, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Hidenori Itamoto, Terutaka Tamaizumi, Shingo Maeda
  • Patent number: 9758172
    Abstract: A status determination apparatus determining a driver status in a movable body is provided. The status determination apparatus includes a behavior acquisition portion, a check portion, a determination portion, and a range change portion. The behavior acquisition portion obtains behavior information as present behavior information. The behavior information represents behavior of the movable body. The check portion collates the present behavior information with a threshold region representing a range of the behavior information at time when a driver drives absentmindedly. When the threshold region includes the present behavior information, the determination portion determines that the driver drives absentmindedly. The range change portion changes the threshold region.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: September 12, 2017
    Assignee: DENSO CORPORATION
    Inventors: Takahiro Naito, Katsuyoshi Nishii, Yoshinori Watanabe
  • Patent number: 9660561
    Abstract: A motor drive device having drive controller to control a motor for driving an electric vehicle wheel depending on position of magnetic poles using angle detection value sensed by a motor angle sensor; motor angle estimator to estimate an angle of a motor rotor without a rotation sensor; sensor malfunction determiner to determine malfunction of the sensor; sensor switcher to cause the controller to control using an estimation value of the rotor angle estimated by the estimator instead of the angle detection value sensed by the sensor once the determiner determines that the sensor malfunctions; and start-up rotor angle calculator to calculate an angle of the rotor from a counter electromotive voltage of the motor and to cause the controller to control using the calculated angle, when the motor is started up after stop of the motor in a state where the sensor is determined as malfunctioning by the determiner.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: May 23, 2017
    Assignee: NTN CORPORATION
    Inventor: Hiroyuki Yamada
  • Patent number: 9555829
    Abstract: Provided is a method for operating a power steering system and to such a power steering system. A motor torque is computed by an electronic processor and is established by suitable motor actuation, wherein a plausibility check of the computed motor torque is carried out, taking a measured manual torque into consideration. A value of the additional torques of at least one special function is further considered in the plausibility check.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: January 31, 2017
    Assignee: Robert Bosch Automotive Steering GmbH
    Inventor: Michael Sprinzl
  • Patent number: 9469341
    Abstract: In accordance with various exemplary embodiments, the present disclosure provides a method for controlling a steering aid for a steering system of a vehicle. Upon activation of a vehicle in which a steering aid has been deactivated, a signal instructing a driver to rotate a steering wheel of the steering system without a steering assist motor can be generated. Whether rotation of the steering assist motor occurs during rotation of the steering wheel can be determined. The steering aid can be activated when the steering assist motor has rotated.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: October 18, 2016
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventor: Jens Dornhege
  • Patent number: 9234331
    Abstract: An articulation control system for a machine may include an actual steering sensor configured to provide a signal indicative of an actual steering angle, a timer configured to provide a signal indicative of an elapsed predetermined period of time, and a controller in communication with the actual steering sensor and the timer. The controller may be configured to regulate automatic articulation to zero based on signals received from the actual steering sensor and the timer.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: January 12, 2016
    Assignee: Caterpillar Inc.
    Inventors: Amit Sharma, Steven C. Budde
  • Patent number: 9221491
    Abstract: There is provided an electric power steering system that makes it possible to reduce an uncomfortable feeling given to a driver even when a detected steering torque value is held. The controller computes a detected steering torque value based on the detection signal, and provides compensation based on a compensation value to a basic current command value to compute a current command value. The controller executes feedback control for causing a current value of the motor to follow the current command value. The controller executes normal control in which the detected steering torque value is periodically updated and backup control in which periodic updating of the detected steering torque value and holding of the detected steering torque value are alternately executed. The controller switches compensation value between a compensation value used during execution of the normal control and a compensation value used during execution of the backup control.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: December 29, 2015
    Assignee: JTEKT CORPORATION
    Inventor: Takashi Kodera
  • Patent number: 9221492
    Abstract: A computer and function architecture for operating an electrical power-assisted steering system, comprises a control path and a monitoring path that has a diverse design in relation thereto and which are processed basically parallel to each other in each case on two associated cores of a redundant microcomputer, and arithmetic differences that occur within the control path or the monitoring path are detected at the functional level by way of a comparator, and the results of individual computing steps are detected at the granular level by way of a core comparator, and as a result of a detected difference of the comparator at the functional level, a transition is made into an emergency operating mode in the event that the core comparator has not diagnosed an arithmetic error, so as to ensure further availability of at least some of the steering assistance function or of the steering functions over at least a certain time period.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: December 29, 2015
    Assignee: Robert Bosch Automotive Steering GmbH
    Inventor: Peter Brenner
  • Patent number: 9203332
    Abstract: A motor drive device is provided which allows control to be performed depending on a position of magnetic poles of a rotor even when a motor rotor angle sensor malfunctions. The device controls a motor for driving a wheel of an electric vehicle, depending on the position of the magnetic poles by using an angle sensed by the angle sensor provided at the motor. The device includes an estimator estimating an angle of a rotor of the motor without using a rotation sensor; a sensor malfunction determiner determining a malfunction of the angle sensor; and a switcher causing control to be performed using a angle estimated by the estimator instead of the angle sensed by the angle sensor once the determiner determines that the angle sensor malfunctions.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: December 1, 2015
    Assignee: NTN CORPORATION
    Inventor: Hiroyuki Yamada
  • Patent number: 9193352
    Abstract: An engine shaft of an engine, rotatable shafts of motor generators and a drive force output shaft are interconnected with each other through a drive force transmission arrangement. An ECU computes a torque command value of each of the motor generators through use of an equation of torque equilibrium, which corresponds to the drive force transmission arrangement, based on an engine shaft demand motor generator torque and an output shaft demand motor generator torque.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: November 24, 2015
    Assignee: DENSO CORPORATION
    Inventor: Youhei Morimoto
  • Patent number: 9174675
    Abstract: A steering apparatus includes a history holding unit recording a zero point maximum value and a zero point minimum value of a steering angle of a steering wheel, a precursor determination unit, and a characteristic variation determination unit. The history holding unit cancels the recorded zero point maximum value and the recorded zero point minimum value respectively, when a predetermined period elapses following the update of the recorded value. When the precursor determination unit determines that the system is in a precursory condition to characteristic variation, the characteristic variation determination unit determines whether or not characteristic variation has occurred in the steering transmission system on the basis of at least one of an amount of increase in the zero point maximum value and an amount of decrease in the zero point minimum value following a point at which the system is determined to be in the precursory condition.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: November 3, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Ryouchi Watanabe
  • Patent number: 9156464
    Abstract: In a method of steering a vehicle by a steering assistance system, a steering-wheel angle of a steering wheel is set by a driver. The steering assistance system checks whether the set steering-wheel angle is maintained during a predefined time period and checks whether the driver has taken the hands from the steering wheel. The vehicle is then operated according to the set steering-wheel angle, when the driver maintains the set steering-wheel angle during the predefined time period, or the steering assistance system is switched off, when the driver has released the steering wheel.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: October 13, 2015
    Assignee: AUDI AG
    Inventors: Stefan Schuberth, Alexander Breu
  • Patent number: 9043091
    Abstract: When a partial malfunction is detected, a sensor malfunction determination unit changes a control mode from a first control mode to a second control mode. When the control mode is changed from the first control mode to the second control mode, a steered system motor is rotated in a direction corresponding to a rotation direction of a steering wheel immediately before the partial malfunction occurs in the angle sensor. When the absolute value of a steering angular velocity of the steering wheel exceeds a threshold, it is determined that a driver has operated the steering wheel in a direction opposite to a current steered direction, and the rotation direction of the steered system motor is reversed.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: May 26, 2015
    Assignee: JTEKT CORPORATION
    Inventor: Ryouhei Hayama
  • Patent number: 9038764
    Abstract: A motor control circuit includes a power relay, a converter division, a smoothing condenser, a control circuit and a motor drive circuit, and is connected to a battery as high voltage power and to an electrical motor. The battery is connected with a driving battery having the high voltage such as 288V etc. A step down circuit reduces the high voltage to a low voltage such as 36V etc., charges a low voltage charge device and supplies drive power to the motor drive circuit. When the vehicle collision is occurred, the control circuit detects the collision by a value of detected acceleration, a power change relay is turned on to change to the power source from the low voltage charge device after voltage of the smoothing condenser is reduced, thereby connecting the low voltage to the motor drive circuit.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: May 26, 2015
    Assignee: JTEKT CORPORATION
    Inventor: Motoo Nakai
  • Patent number: 9031713
    Abstract: A method for operating a motor vehicle from a plurality of motor vehicles includes the steps of determining, by a central point, that a systematic malfunction is present in a plurality of motor vehicles; providing a communication link between the central point and the motor vehicle; and putting at least one electronic control unit of the motor vehicle into a safe operating mode to ensure the operational safety of the motor vehicle.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: May 12, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Stefan Nordbruch, Armin Koehler
  • Publication number: 20150120145
    Abstract: The present disclosure relates to fault management apparatus and method for an independently controlled steering system in a four wheel drive system. The apparatus includes: a steering system unit that is disposed at four wheels of a vehicle, controls steering of the wheels, and collects and transmits the state information of the wheels; and a control unit that controls the steering system unit in accordance with the state information transmitted from the steering system unit. According to the present disclosure, when there is a fault in one or more wheels of a four wheel drive vehicle, it is possible to stabilize the vehicle body by actively adjusting the steering angles of the wheels that normally work and the speed of the vehicle in accordance with the fault environment.
    Type: Application
    Filed: November 26, 2013
    Publication date: April 30, 2015
    Inventors: Dong Seog HAN, In Seok YANG
  • Patent number: 9020704
    Abstract: An electronic control apparatus includes a control unit, a plurality of power supply units for supplying the control unit with power, and a power supply fault detector unit for detecting a fault in the plurality of power supply units. The control unit operates in a normal mode on electric power supplied from the plurality of power supply units when none of the plurality of power supply units is faulty.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: April 28, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Nobuyasu Kanekawa, Ryoichi Kobayashi, Tomonobu Koseki, Keisuke Honda, Atsushi Uehara
  • Patent number: 8996254
    Abstract: A vehicle motion control apparatus which is configured to control a motion of a vehicle comprising a plurality of apparatuses, each of which is configured to selectively control a slip angle or a yaw rate, is provided with: a behavior controlling device which is configured to perform behavior control in which a plurality of apparatuses are controlled such that a slip angle and a yaw rate are a set target slip angle and a target yaw rate, respectively; a turning state quantity specifying device which is configured to specify a turning state quantity of the vehicle; and a selecting device which is configured to select at least one of the slip angle and the yaw rate to be prioritized, on the basis of the specified turning state quantity in a case where the behavior control needs to be performed by one of the plurality of apparatuses.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: March 31, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Norihisa Nishikawa, Mitsutaka Tanimoto, Yoshitaka Fujita, Toru Takashima, Tetsuhiro Narita, Go Inoue, Takahiro Kojo
  • Patent number: 8989966
    Abstract: An ECU controls the operation of an EPS actuator in order to periodically apply instantaneous motor torque to a steering system when assist continuation control is executed using a sensor signal (residual sensor signal) that is output by a sensor element in which an abnormality has not been detected, regardless of the application of an assist force. The ECU also detects an abnormality in the residual sensor signal based on whether the application of instantaneous motor torque is reflected in the residual sensor signal, which is the basis of the assist continuation control.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: March 24, 2015
    Assignee: JTEKT Corporation
    Inventors: Hidenori Itamoto, Akira Ito, Hirozumi Eki, Gempei Nakasone
  • Patent number: 8989965
    Abstract: An electric power steering apparatus includes a steering torque detector for detecting a steering torque applied to a steering mechanism, a motor for generating an assist force that assists steering of a steering wheel, a power voltage detector for detecting a power voltage of a power supply, a power voltage monitoring section for determining a power voltage detection value detected by the power voltage detector and a motor drive controller for calculating an assist amount based on the steering torque and controlling drive of the motor through a driving section. Assist control is maintained based on a drive possible characteristic corresponding to a reduction level of the power voltage of FETs when the power voltage monitoring section determines that the power voltage detection value is less than or equal to an assist operation possible power voltage.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: March 24, 2015
    Assignee: NSK Ltd.
    Inventors: Hirokazu Abe, Yoshiki Ninomiya
  • Patent number: 8983730
    Abstract: An electric motor has a stator and a rotor that are used in common between two systems. An ECU controls the motor torque by supplying drive electric power to the motor coils independently of each other. When the ECU determines that the vehicle is traveling on a uneven road, the ECU causes the electric motor to perform a braking operation by short-circuiting at least two phases of the electric motor of one of the two systems that is other than the system that is executing a torque control of controlling the assist torque according to the steering torque and the vehicle speed.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: March 17, 2015
    Assignee: JTEKT Corporation
    Inventor: Hiroshi Suzuki
  • Publication number: 20150066306
    Abstract: There is provided an electric power steering system that makes it possible to reduce an uncomfortable feeling given to a driver even when a detected steering torque value is held. The controller computes a detected steering torque value based on the detection signal, and provides compensation based on a compensation value to a basic current command value to compute a current command value. The controller executes feedback control for causing a current value of the motor to follow the current command value. The controller executes normal control in which the detected steering torque value is periodically updated and backup control in which periodic updating of the detected steering torque value and holding of the detected steering torque value are alternately executed. The controller switches compensation value between a compensation value used during execution of the normal control and a compensation value used during execution of the backup control.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 5, 2015
    Inventor: Takashi KODERA
  • Publication number: 20150066305
    Abstract: There is provided an reliable electric power steering system. The electric power steering system includes a torque sensor that outputs a detection signal corresponding to a steering torque, and a controller. The controller computes a detected steering torque value based on the detection signal, and a torque differential value, which is a first-order time differential value of the detected steering torque value. The controller computes a current command value by providing compensation to a basic current command value based on the detected steering torque value with the use of a compensation value based on the torque differential value. When the detected steering torque value is held for a predetermined period, the controller holds the torque differential value at a value computed before the detected steering torque value is held, during the period in which the detected steering torque value is held.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 5, 2015
    Inventor: Takashi KODERA
  • Publication number: 20150066304
    Abstract: The present disclosure relates to a left-right independent steering control system and a method thereof, particularly a left-right independent steering control system that controls the other steering system such that the steering angles of both wheels satisfy Ackerman condition, when the steering angle of a vehicle is not controlled in accordance with steering input from a driver due to a breakdown in any one of left wheel and right wheel steering systems of the vehicle, and a method thereof.
    Type: Application
    Filed: November 26, 2013
    Publication date: March 5, 2015
    Inventors: Dong Seog HAN, In Seok YANG
  • Patent number: 8972115
    Abstract: A motor driven power steering (MDPS) may include: a vehicle speed sensor configured to sense vehicle speed; a temperature sensor configured to sense a temperature of a power pack; a current sensor configured to sense an amount of current applied to the MDPS; a storage unit configured to store a thermal resistance value based on the vehicle speed with respect to the temperature of the power pack; and a control unit configured to calculate an estimated temperature by reflecting the thermal resistance value based on the vehicle speed with respect to the temperature of the power pack and the current amount applied to the MDPS into a temperature estimation function, and drive a motor according to the calculated estimated temperature.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: March 3, 2015
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Se Wook Oh
  • Patent number: 8972114
    Abstract: The present disclosure relates to a left-right independent steering control system and a method thereof, particularly a left-right independent steering control system that controls the other steering system such that the steering angles of both wheels satisfy Ackerman condition, when the steering angle of a vehicle is not controlled in accordance with steering input from a driver due to a breakdown in any one of left wheel and right wheel steering systems of the vehicle, and a method thereof.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: March 3, 2015
    Assignee: Kyungpook National University Industry-Academic Cooperation Foundation
    Inventors: Dong Seog Han, In Seok Yang
  • Patent number: 8965633
    Abstract: One or more vehicle steering measurements of a vehicle may be measured. One or more expected vehicle steering measurements may be calculated, each calculated expected vehicle steering measurement corresponding to one of the measured vehicle steering measurements. At least one difference between one of the measured vehicle steering measurements and its corresponding calculated expected vehicle steering measurement may be calculated. A speed of the vehicle may be measured. One or more current threshold values may be calculated based on the measured speed, each of the current threshold values corresponding to one of the measured vehicle steering measurements and its corresponding calculated expected vehicle steering measurement. An automatic vehicle control system may be deactivated when one or more of the calculated differences exceeds its corresponding current threshold value.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: February 24, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Jin-Woo Lee, Bakhtiar Brian Litkouhi
  • Patent number: 8960363
    Abstract: Disclosed is an electric power steering device capable of applying a prescribed steering assist force to a steering assembly, even when a torque sensor is out of order and the electric power steering device is in a state of being unable to sense steering torque by the torque sensor. Using an angle of rotation of a rotating element, which is detected by a resolver that serves as a rotating element angle of rotation sensing unit of a motor, a steering angle and a steering angular velocity are estimated, and a prescribed steering assist force is applied to a steering assembly by the motor, on the basis of an estimated steering angle and/or an estimated steering angular velocity.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: February 24, 2015
    Assignee: Honda Motor Co., Ltd.
    Inventors: Fumihiro Morishita, Takuji Wada, Hiroaki Horii, Hiroki Sagami, Kyoji Hamamoto, Shinji Hironaka
  • Patent number: 8958953
    Abstract: A method for influencing the direction of travel of a vehicle. In order to lower the risk of accidents in driving situations in which the driver reacts incorrectly, for example because of being surprised, it is provided that the driving operation be monitored in reference to the occurrence of an event due to which the travel direction of the vehicle changes, deviating from the travel direction specified at the steering wheel, and when such an event is detected that an automatic intervention in the driving operation be performed whereby the vehicle is moved back approximately into the original direction of travel in which it was moving before the event occurred.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: February 17, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Stephan Stabrey
  • Patent number: 8954238
    Abstract: An emergency evacuation device of a vehicle that executes an automatic vehicle stop control based on a command of a driver is disclosed. The emergency evacuation device comprises a driver's physiological condition estimation portion that estimates a driver's physiological condition; a driver's command input portion, operated by the driver, that receives a driver's command input and outputs a command of an execution of an automatic vehicle stop control in accordance with the command input; and an automatic vehicle stop control portion that executes the automatic vehicle stop control in response to the command from the driver's command input portion, wherein based on the driver's physiological condition estimated in the driver's physiological condition estimation portion, the structure of the driver's command input portion, for example, the arrangement of receptor(s) of the driver's command input portion receiving the command from the driver is changed.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: February 10, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masumi Kobana, Kazuya Sasaki, Shinya Kawamata
  • Patent number: 8954235
    Abstract: A method and system may measure one or more vehicle steering measurements or quantities and calculate one or more expected vehicle steering measurements. The method and system may deactivate an automatic vehicle control system based on the one or more measured vehicle steering measurements and the one or more expected vehicle steering measurements. The vehicle steering measurements may include a vehicle steering angle measurement, vehicle steering torque measurement, or other vehicle dynamics measurements. The automatic vehicle control system may include an automated lane centering system, lane keeping assist, or other autonomous vehicle steering control system.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: February 10, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Jin-Woo Lee, Bakhtiar Brian Litkouhi
  • Patent number: 8948970
    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that realizes weight saving and downsizing of component parts by counting and controlling the number of times of end hitting and simultaneously calculating a current limit value depending on the number of times of end hitting to limit assist.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: February 3, 2015
    Assignee: NSK Ltd.
    Inventors: Shinji Okada, Hideyuki Kobayashi, Naoki Sawada
  • Patent number: 8935051
    Abstract: Disclosed herein is a system and method for improving a steering feeling of a driver while preventing a heavy feeling of a steering wheel or a kickback phenomenon during an eco-roll operation for improving a fuel ratio of the vehicle. The method includes determining, by a controller, an eco-roll operation condition in which a brake is disengaged, an accelerator pedal is disengaged, and a speed of the vehicle is a reference speed or higher. Furthermore, when the eco-roll operation condition is determined, the controller coverts a gear state of a transmission into a neutral gear state. The controller also controls an engine RPM to an idle RPM to start the eco-roll mode and an operation of an emergency steering system to assist steering power according to a steering input due to a driver manipulation of a steering wheel while the traveling in a neutral gear state of an eco-roll mode.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: January 13, 2015
    Assignee: Hyundai Motor Company
    Inventor: Jin Han Kim
  • Patent number: 8930083
    Abstract: An electric power steering system is provided. It comprises a steering assist assembly and a motor assembly that actuates the steering assist assembly. A control module that provides steering assist commands to the motor assembly, the control module including a circuit board having a first portion having circuits thereon and a second portion that includes at least one sensor circuit that receives signals from at least one sensor subsystem. A potting material coats only the first portion of the circuit board.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: January 6, 2015
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Stephen Gillman, John R. Hoffman, Brian T. Murray, Wayne B. Thomas
  • Patent number: 8924081
    Abstract: An electric power steering apparatus and control device integrated-type electric motor includes an electric motor driving circuit constituted by a plurality of semiconductor power elements and controlling electric power supplied to an armature winding of an electric motor, a switch device for opening and closing a connection between an input terminal of the electric motor driving circuit and an external power source, and another switch device for opening and closing the armature winding, wherein at least one of both the switch devices is constituted by a semiconductor switch element, and the power elements and the semiconductor switch element are mounted on a board attached to a metallic case.
    Type: Grant
    Filed: July 16, 2008
    Date of Patent: December 30, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Sonoda, Yoshihito Asao
  • Patent number: 8909429
    Abstract: In a vehicle steering system, when a sensor malfunction determination unit detects a malfunction of a rotation angle sensor, the sensor malfunction determination unit changes a control mode from a first control mode to a second control mode. In the second control mode, an actual rotor angle (mechanical angle) (?SM) of a steered system motor is computed on the basis of a second rotor angle (electric angle) (?SE2) estimated by a rotation angle estimation unit. Then, feedback control is executed such that the actual rotor angle (?SM) converges to a target rotor angle (?SM1*) that is obtained by superimposing a rotation maintaining command signal on a target rotor angle (?SM*) computed by a target rotor angle computation unit.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: December 9, 2014
    Assignee: JTEKT Corporation
    Inventor: Ryouhei Hayama
  • Patent number: 8897966
    Abstract: Embodiments of the invention provide methods and apparatus for reducing steering effort in a vehicle. In one embodiment, a method for installing a steering-assist system onto a vehicle having an electrically powered steering system is provided. The method includes placing a controller between a torque sensor and an electronic control unit (ECU) disposed on the vehicle, coupling a primary signal line from the torque sensor to be in electrical communication with the controller, and coupling a secondary signal line to the controller to be in electrical communication with the ECU, wherein, when movement is detected by the torque sensor, the torque sensor provides a primary signal to the controller and the controller provides a secondary signal to the ECU, the secondary signal being different than the primary signal.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: November 25, 2014
    Inventors: Carlos A. Saez, Alejandro Javier Goldsmith Llorenz, Neil Emerson Rollano Conde
  • Patent number: 8897968
    Abstract: In an electric power steering system, a control signal output section outputs independent dual-system control signals to driver circuits that are disposed in connection with independent dual-system motor coils. The control signal output section gives high priority to the output of the control signal to the other system, when the occurrence of energization failure is detected in one system. When the energization failure occurring phase is only one phase and the value of the basic command exceeds the upper limit of the priority command, the control signal output section outputs the control signal to the driver circuit in the system where the energization failure has occurred in order to supply electric power in which the two phases other than the energization failure occurring phase are used as the energized phases on the bases of the complementary command that corresponds to the excess of the upper limit.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: November 25, 2014
    Assignee: JTEKT Corporation
    Inventor: Hiroshi Suzuki
  • Patent number: 8897930
    Abstract: This application describes the software invented to control an electric motor system. The electric motor system is mounted on one or more aircraft main wheels or nose wheels to drive an aircraft independently on the ground without aircraft engines or tow vehicles. The software uses closed-loop control together with several other control laws to operate the drive motor or motors. Knowledge of the current operating state of the drive motor, together with knowledge of the commands given to taxi forward, taxi in reverse, or brake in reverse, is used to configure the motors to optimal operating parameters. The software architecture is described along with the pilot interface and many details of software implementation.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: November 25, 2014
    Inventor: Janice Ilene Bayer
  • Patent number: 8897967
    Abstract: The electric power steering apparatus has a plurality of power systems each including an inverter apparatus provided corresponding to a plurality of wiring sets of a motor thereof. The control section calculates the assist current to be supplied to the motor using a one power system failure-state map when the inverter apparatus or its corresponding wiring set of one of the power systems fails, or using a vehicle speed detection failure-state map when there is a failure in detecting the vehicle speed. The assist current limit value in the one power system failure-state map and the assist current limit value in the vehicle speed detection failure-state map are set to the same value.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: November 25, 2014
    Assignee: Denso Corporation
    Inventor: Nobuhiko Uryu
  • Patent number: 8892296
    Abstract: [Problem] An object of the present invention is to provide a power state diagnosis method and a power state diagnosis apparatus that pass and increase not only a d-axis current but also a q-axis current to a current value that a steering behavior does not occur to perform a diagnosis in the vector control of a motor, and determine that a power supply degraded, that the power supply is normal and that the diagnosis is not completed without giving an uncomfortable feeling to a driver, detecting a timing that there is not a driver, and needing to comprise a plurality of actuators.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: November 18, 2014
    Assignee: NSK Ltd.
    Inventors: Hirokazu Abe, Yoshiki Ninomiya, Toru Sakaguchi
  • Patent number: 8886412
    Abstract: A steering system for an autonomously driven vehicle and methods of steering the vehicle are disclosed. A main controller signals a secondary steering assembly to operate in a first phase when a power steering controller is in a first mode and a second phase to steer the vehicle when the power steering controller is in a second mode. The main controller signals a friction device to actuate to a disengaged position when the power steering controller is in the first mode and the secondary steering assembly is in the first phase, and to signal the friction device to actuate to an engaged position to secure a steering wheel in an initial position when the power steering controller is in the second mode and the secondary steering assembly is in the second phase to allow the secondary steering assembly to steer the vehicle.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: November 11, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Kenneth L. Rosol, David M. Sidlosky, Robert W. Leschuk, Scott R. Kloess, John T. Zuzelski, Eric L. Raphael, Yat-Chung Tang, Stephen Pastor
  • Patent number: 8886378
    Abstract: A plurality of industrial vehicle operating parameters are observed and evaluated to monitor drivetrain(s) of the vehicle to determine whether a traction motor has become decoupled from its drivetrain, i.e., a dynamic gearbox failure. If a dynamic gearbox failure is detected, a static test is performed while the vehicle is stopped to confirm the failure. Drive capabilities of the vehicle are restricted if the dynamic gearbox failure is confirmed by the static test while full drive capabilities are enabled if not. A parking brake test is performed by applying each mechanical brake that is attached to a traction motor or a driving wheel and then individually controlling the traction motors in accordance with an operator's travel request such that each motor produces enough torque to rotate the motor if the brake its respective drive wheel is functionally degraded.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: November 11, 2014
    Assignee: Crown Equipment Corporation
    Inventors: Joe K. Hammer, Michael P. Kovach, Ronald L. Ziegler
  • Patent number: 8884577
    Abstract: In a control apparatus for a rotary electric machine receiving power from a DC power supply, a DC-AC converting circuit is provided with serially connected circuits each having high-potential-side and low-potential-side switching elements. When a short-circuit occurs at the switching elements, all the switching elements are turned OFF for failsafe and a path connecting the machine and the battery is opened. In such a case, a switching element belonging to part of the switching elements is turned ON, with potential at all the terminals of the rotary electric machine being the same. A location of the short-circuit occurs is identified, based on changes in current passing through the machine and being detected in response to turning ON the switching element. The changes are at least one of a reduction change in deviation of the current from a zero point and a reduction change in an absolute value of the current.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: November 11, 2014
    Assignee: Denso Corporation
    Inventor: Hiroya Tsuji
  • Patent number: 8869930
    Abstract: A vehicle steering system includes: a steering mechanism that includes a steering member, a steering angle detecting unit and a direction detecting unit that detects a steering direction with reference to a neutral position of the steering member; a steered mechanism that includes a steered wheel and a turning actuator having a turning motor, and that is not mechanically coupled to the steering mechanism; and a control device that controls the turning motor and that, at the time of a failure of the steering angle detecting unit, controls the turning motor by determining a turning motor command value for controlling the turning motor on the basis of a detected signal from the direction detecting unit.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: October 28, 2014
    Assignee: JTEKT Corporation
    Inventor: Atsushi Ishihara
  • Patent number: 8868298
    Abstract: An electric power assist steering motor sensor redundancy system is disclosed comprising a brushless motor selectively providing a first predetermined level of steering assistance for a vehicle. A first sensor and second sensor provide position information of the brushless motor to a motor controller. An alternative sensing system for the brushless motor may be selectively utilized to provide position information of the brushless motor to the controller when at least one of the first sensor or the second sensor fails.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: October 21, 2014
    Assignee: Ford Global Technologies, LLC
    Inventors: Kirt L. Eschtruth, William J. Bouse
  • Publication number: 20140309890
    Abstract: A method for implementing a transition from a functioning steering assistance system to a deactivated steering assistance system when a fault occurs, comprising the following steps: establishing the fault of the steering assistance system; establishing that all high-side power switches are functional (first case), or establishing that all low-side power switches are functional (second case); and in the first case: opening all high-side power switches and performing PWM-like control of the low-side power switches; or in the second case: opening all low-side power switches and performing PWM-like control of the high-side power switches.
    Type: Application
    Filed: March 24, 2014
    Publication date: October 16, 2014
    Applicant: ZF LENKSYSTEME GMBH
    Inventor: Markus WEBER