Condition Modulated Patents (Class 180/446)
  • Patent number: 10005491
    Abstract: An electric power assisted steering system comprising an input shaft and an output shaft, an electric motor connected to the output shaft, at least two sensors including one or more of: a position sensor, a torque sensor, and a motor position, and a motor controller that causes the motor to apply an assistance torque as a function of the torque measured by the torque sensor, in which each of the sensors produces at least one output signal represented by a stream of digital samples captured at discrete times, and in which the apparatus further comprises: processing means arranged to process together the output signals from both processing units to produce at least one further signal.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: June 26, 2018
    Assignee: TRW Limited
    Inventor: James Owen Patrick Farrelly
  • Patent number: 9994249
    Abstract: Maneuverability and stability of a suspension unit for a vehicle are improved. A vehicle includes: a steer-by-wire system detecting a displacement of a steering wheel and displacing a steering rack steering steerable wheels on a basis of a detection result of the displacement and a suspension unit suspending the steerable wheels, the suspension unit including: wheel hub mechanisms, each wheel hub mechanism supporting a tire wheel on which a tire is attached, and a plurality of link members supporting the wheel hub mechanisms on the vehicle body; and a kingpin axis passing through an upper pivot point of the link members and lower pivot point of the link members being set to pass through a road surface contact area of the tire at a neutral position of the steering wheel.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: June 12, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yusuke Kageyama, Yutaka Mikuriya
  • Patent number: 9994253
    Abstract: A lane keeping assist apparatus has a vehicle speed responsive adjustment section which receives a target steering angle and a vehicle speed, sets a vehicle speed adjustment coefficient on the basis of the vehicle speed, multiplies an FF target steering torque by the vehicle speed adjustment coefficient, and outputs the resultant value as an adjusted FF target steering torque. The vehicle speed adjustment coefficient is set to 0 when the vehicle speed is lower than a first set vehicle speed and to 1 when the vehicle speed is higher than a second set vehicle speed. An adding section adds the adjusted FF target steering torque and an FB target steering torque together and outputs the resultant value as a final target steering torque.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: June 12, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuji Okuda, Hidenobu Kinugasa
  • Patent number: 9988077
    Abstract: Filters output a vibration-suppression gain for suppressing resonance of a sub frame or shimmy by performing a filter processing on a rotational angle of a motor. The filters have respective frequency characteristics that a gain becomes a maximum magnitude and a phase advances by 90° at a cut-off angle frequency. The cut-off angle frequency of the filter is fixedly set at a resonance frequency of the sub frame. The cut-off angle frequency of the filter is variably set in accordance with a tire rotation frequency. A gain adder adds the respective gains of the filters and outputs an added magnitude to a correcting mechanism as a vibration-suppression gain. The correcting mechanism corrects a motor torque set by an assist map by using the vibration-suppression gain outputted by the gain adder.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: June 5, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventor: Masaki Chiba
  • Patent number: 9988075
    Abstract: An update amount calculation processing circuit manipulates a control angle based on an update amount in order to perform feedback-control for causing a steering torque to be adjusted to a target torque. In this case, the update amount calculation processing circuit executes a guard process on the update amount with reference to an estimated amount of change that is a speed equivalent value based on estimation by an induced voltage observer. However, when a command current set by a command current setting processing circuit is zero, the update amount calculation processing circuit determines the estimated amount of change subjected to the guard process to be the update amount. When the command current is zero and the update amount is fixed to a guard value, an electric path between the synchronous motor and a battery is blocked.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: June 5, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Naoki Yamano, Hidenori Itamoto, Takashi Kodera, Yoshihiro Yamashita, Koji Anraku
  • Patent number: 9975571
    Abstract: Using an update amount, an update amount calculating circuit manipulates a phase-control angle so as to perform feedback control such that a steering torque corresponds to a target torque. The steering torque is obtained by reducing a steering torque in magnitude by a predetermined value. The phase-control angle is used to convert a current command value to a value of a fixed coordinate system, for example. Using a guard value, a guard processing circuit performs a guard process on a current command value set by a command value setting circuit, so that the current command value becomes the current command value. The guard value is used to determine an appropriate range for a variation in the current command value in accordance with an amount by which the steering torque exceeds in magnitude the target torque.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: May 22, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Koji Anraku
  • Patent number: 9975569
    Abstract: An automotive vehicle may include an engine, an electric power steering system and at least one controller. The at least one controller may, during an auto stop event of the engine, reduce at a first rate an available electric power steering system current to a non-zero threshold value before fuel to the engine is shut off and reduce at a second rate different than the first rate the available electric power steering system current from the non-zero threshold value to 0 after fuel to the engine is shut off.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: May 22, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: Kirk Pebley, Sangeetha Sangameswaran, William James Bouse, John Michael Jakupco, Kevin Roy Harpenau
  • Patent number: 9975572
    Abstract: An in-vehicle device controller has at least two redundant operating condition detection units. Under normal circumstances, the controller performs actuator drive control based on an operating condition detection signal of one of the operating condition detection units. Upon detection of an abnormality in the signal transmission state, data state or operating status of one of the at least two operating condition detection units, the controller performs actuator drive control based on an operating condition detection signal of another one of the at least two operating condition detection units in which no abnormality is present. By this control, the actuator function is preserved even in the event of the abnormality in the operating condition detection unit or operating condition detection signal.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: May 22, 2018
    Assignee: HITACHI AUTOMOTIVES SYSTEMS, LTD.
    Inventors: Mitsuo Sasaki, Takumi Hisazumi
  • Patent number: 9966890
    Abstract: A system for detecting offset error in a power steering system is provided. The system includes a programmable high pass filter module configured to filter a final voltage command and generate a filtered final voltage command. The filtered final voltage command includes the sinusoidal component, a gain and phase compensation module configured to perform a gain compensation and a phase compensation on the filtered final voltage command to generate a compensated final voltage command. An error detection module is configured to determine an offset of the compensated final voltage command in a stator reference frame.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: May 8, 2018
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Prerit Pramod, Siddharth Ballal, Julie A. Kleinau
  • Patent number: 9956990
    Abstract: A lane keeping assist apparatus has a vehicle speed responsive adjustment section which receives a target steering angle and a vehicle speed, sets a vehicle speed adjustment coefficient on the basis of the vehicle speed, multiplies an FF target steering torque by the vehicle speed adjustment coefficient, and outputs the resultant value as an adjusted FF target steering torque. The vehicle speed adjustment coefficient is set to 0 when the vehicle speed is lower than a first set vehicle speed and to 1 when the vehicle speed is higher than a second set vehicle speed. An adding section adds the adjusted FF target steering torque and an FB target steering torque together and outputs the resultant value as a final target steering torque.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: May 1, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuji Okuda, Hidenobu Kinugasa
  • Patent number: 9937954
    Abstract: Provided is a steering reaction force control apparatus for a vehicle including a driving support device configured to control an electric power steering device via a controller so that a steered angle of steered wheels reaches a target steered angle. When the driving support device is operating, the controller calculates a target steering attenuation torque based on a steering angular velocity that is a time derivative of the steering angle or a time derivative of a corrected steering angle acquired by correcting the steered angle with a target steered angle of the driving support device. When the magnitude of the steering angular velocity is less than a reference value, the target steering attenuation torque is calculated so that the magnitude of the target steering attenuation torque becomes smaller when the driving support device is operating compared with when the driving support device is not operating.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: April 10, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshio Kudo
  • Patent number: 9933323
    Abstract: A torque measurement system for measuring a torque acting on a rotatable shaft is provided. The torque measurement system includes a first housing portion having a first end adapted to be fixedly coupled to the rotatable shaft and a second end. The torque measurement system includes a second housing portion having a first end spaced apart from the second end of the first housing portion so as to define a gap between the first housing portion and the second housing portion. The second housing portion is adapted to be fixedly coupled to the rotatable shaft. The torque measurement system includes at least one sensor that observes at least one of the second end of the first housing portion, the first end of the second housing portion and the gap and generates sensor signals based on the observation. The sensor signals are indicative of a torque acting on the rotatable shaft.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: April 3, 2018
    Assignee: Honeywell International Inc.
    Inventors: Pascal Schweizer, Christophe Le Moing, Remy Chaumont, Michael Schulz, Stefan Simon, Andy Mark Nicol
  • Patent number: 9932069
    Abstract: When a vehicle is quickly steered while the vehicle is travelling at an extremely low speed, a load on an in-vehicle power supply is reduced without deteriorating a steering feeling by reducing a motor driving current. A steering speed is compared with a threshold. When the steering speed is lower than the threshold, the process proceeds to step S6. In step S6, a voltage value of a battery power supply, which is used as a prescribed value, is set as a limit voltage in order to reduce a motor consumption current. When the steering speed is higher than the threshold, a value “V0/n” lower than the prescribed value is set as the limit voltage to reduce a consumption current when the steering wheel is steered without driving. “n” is “delay adjustment parameter”, and is a real number that exceeds 1.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Toyoki Sugiyama, Yasuyuki Yoshii
  • Patent number: 9914476
    Abstract: A vehicle steering system includes a higher-level ECU and a lower-level ECU. The lower-level ECU includes a steered angle limit setter, and steered angle limiters. The steered angle limit setter sets an allowable upper limit to a target inner and outer wheel steered angle difference responsive to the absolute value of a target outer steered angle. The steered angle limit setter calculates a limit to the absolute value of a target inner steered angle. The steered angle limit setter subsequently sets this limit for one of the steered angle limiters that is fed the target inner steered angle in the present calculation cycle. The limiter, which is fed the target inner steered angle, limits the absolute value of the target inner steered angle so that the absolute value of the target inner steered angle is equal to or below the limit, and outputs the resulting value.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: March 13, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Toshiaki Oya
  • Patent number: 9889873
    Abstract: A method of operating a driver assistance system of a motor vehicle for performing an automatic steering intervention involves detecting how firmly a driver is holding a steering wheel, and determining an intensity value i.e. control value dependent on how firmly the driver is holding the steering wheel. The control value is higher when the driver is holding the steering wheel more firmly, and lower when the driver is holding the steering wheel less firmly. The method then applies an automatic steering intervention with an applied intensity that is controlled in accordance with the control value, so that the applied intensity of the automatic steering intervention is higher when the driver is holding the steering wheel more firmly, and lower when the driver is holding the steering wheel less firmly. A steering assistance system includes a memory, a processor, sensors and an automatic steering control system, to implement the method.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: February 13, 2018
    Assignee: Continental Teves AG & Co. oHG
    Inventor: Stefan Lueke
  • Patent number: 9884643
    Abstract: A friction compensation control apparatus of a motor driven power steering (MDPS) system may include: a damping control unit configured to detect a damping torque of the MDPS system; and a friction compensation control module configured to detect a friction compensation torque using a column torque, a motor speed, and a vehicle speed, and adjust the detected friction compensation torque according to the magnitude of the damping torque.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: February 6, 2018
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventor: Eun Kyung Gu
  • Patent number: 9873450
    Abstract: A system for detecting offset error in a power steering system comprises a programmable high pass filter module configured to filter a final voltage command and generate a filtered final voltage command that includes the sinusoidal component, a gain and phase compensation module configured to perform a gain compensation and a phase compensation on the filtered final voltage command to generate a compensated final voltage command; and an error detection module configured to determine an offset of the compensated final voltage command in a stator reference frame.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: January 23, 2018
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Prerit Pramod, Siddharth Ballal, Julie A. Kleinau
  • Patent number: 9873453
    Abstract: A system for detecting handwheel control comprises a driver torque estimation module that estimates a driver torque state based on a plurality of electric power steering signals; and a grip detection module that determines one of a grip level, a hands-on wheel flag, and a transition blending factor from the driver torque state, the grip level is used to control a driver assist power steering system.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: January 23, 2018
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Shrenik P. Shah, Chang Wang, Mariam Swetha George
  • Patent number: 9866155
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that the heat generation of FETs is not concentrated in one FET and the heat generation is distributed to the plural FETs by operating the duties of all three-phases in a case that the driving of the motor is stopped.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: January 9, 2018
    Assignee: NSK LTD.
    Inventors: Takayoshi Sugawara, Ryo Minaki, Hideki Sawada
  • Patent number: 9862407
    Abstract: An electric power steering apparatus includes a motor for applying assist torque to a vehicle steering mechanism and a controller, which controls driving of the motor to cause the assist torque to follow an assist command value. The controller calculates a basic assist command value based on steering torque applied to the steering mechanism and corrects the basic assist command value using a correction value, thereby setting the assist command value. If the steering torque has an absolute value greater than a threshold value when the vehicle is in a straight-line traveling state, the controller sets the correction value such that the absolute value of the steering torque is reduced. If the steering torque has an absolute value less than the threshold value when the vehicle is in a straight-line traveling state, the controller sets the correction value such that the absolute value of the assist command value is reduced.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: January 9, 2018
    Assignees: JTEKT CORPORATION, NISSAN MOTOR CO., LTD.
    Inventors: Tetsuya Nozawa, Shinya Aono, Takayuki Ohta, Tomohiko Usui, Yuuichi Fukuyama, Takashi Sekiguchi
  • Patent number: 9857263
    Abstract: A method for a vehicle, comprising: following a vehicle-off event, waking a powertrain control module based on a comparison of an ambient temperature and a bulk fuel temperature; and then initiating an evaporative emissions system leak test. In this way, the evaporative emission leak test may be initiated without waking the powertrain control module arbitrarily. By waking the powertrain control module and initiating the test based on ambient and bulk fuel temperatures the execution rate of the leak test can be increased.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: January 2, 2018
    Assignee: Ford Global Technologies, LLC
    Inventor: Aed M. Dudar
  • Patent number: 9845133
    Abstract: An electric bike is described and includes an air speed sensor to sense air speed at the bike, an electric motor to impart motive force to the bike, and a controller operatively connected to the motor, the controller to control the electric motor using the air speed sensed by the air speed sensor. The controller includes a set electric-motor parameter for the output power of the motor. The electric-motor parameter can be bike speed. The controller can also use ground inclination to determine the power to be output by the motor to assist in powering the bike. The controller can use ground inclination to determine the power to be output by the motor to charge a battery in the bike. The controller can set the power of motor assist to be greater in a greater headwind than in a lighter headwind. The controller uses rider weight and rider height as parameters for controlling the motor.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: December 19, 2017
    Assignee: Ford Global Technologies, LLC
    Inventors: Richard Craven, Thomas Robert George Thompson
  • Patent number: 9840274
    Abstract: An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setter of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setter includes a gain setter which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: December 12, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takatsuka, Sadaaki Kamei
  • Patent number: 9828021
    Abstract: Disclosed is a power steering apparatus including: a rack shaft that includes a rack, and moves front wheels; a steering wheel-side pinion shaft that includes a pinion meshing with steering wheel-side rack teeth of the rack shaft, and is rotated along with the steering of a steering wheel; an assistance unit-side pinion shaft that includes a pinion meshing with an assistance unit-side rack of the rack shaft, and is driven by an electric motor to rotate so as to assist the rotation of the steering wheel-side pinion shaft; and a steering angle sensor that is provided on the assistance unit-side pinion shaft, and detects a rotational angle of the assistance unit-side pinion shaft.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: November 28, 2017
    Assignee: SHOWA CORPORATION
    Inventors: Takayuki Ueno, Masaru Ishiwata
  • Patent number: 9828023
    Abstract: An electric power steering device includes a steering angle reference yaw rate calculation section that calculates a steering angle reference yaw rate by using a speed of a vehicle and a steering angle of a steering wheel, a torque estimation device that estimates a self-aligning torque (SAT) generated in a turning wheel of the vehicle on the basis of a measured yaw rate or the steering angle reference yaw rate, the absolute value of which is smaller, and the speed of the vehicle, and estimates a required assist torque on the basis of the estimated SAT, and an abnormality determination section that determines whether or not a steering torque sensor is abnormal. If the steering torque sensor is abnormal, an EPS control device controls drive of an assist motor using the required assist torque estimated by the torque estimation device, in place of a steering torque.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: November 28, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Ryota Mose, Norifumi Tamura, Yoshinobu Mukai, Kyoji Hamamoto, Hironori Aoyagi
  • Patent number: 9821837
    Abstract: An electric power steering apparatus including a steering wheel return control section that calculates a steering wheel return control current by a steering angle, the steering torque, the vehicle speed and a steering angle velocity, and drives the motor by a compensation current command value made by adding the steering wheel return control current to the current command value.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: November 21, 2017
    Assignee: NSK LTD.
    Inventor: Tetsuya Kitazume
  • Patent number: 9815493
    Abstract: A vehicle comprising an electric power assist steering (EPAS) system, wherein the EPAS system is configured to receive a detected value of steering wheel angle and/or steering wheel angular velocity and wherein the EPAS system is configured to improve the accuracy of the detected value of steering wheel angle and/or steering wheel angular velocity by compensating for any one or more of an angular phasing of the joint between any two linked components of the steering mechanism and the effect on steering wheel angle of the deflection across a torque sensor at least substantially due to the stiffness of that torque sensor.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: November 14, 2017
    Assignee: Jaguar Land Rover Limited
    Inventors: Alex Bean, Paolo Pucci
  • Patent number: 9806626
    Abstract: An electric motor controller and methods of determining which input power line of a plurality of input power lines of a motor drive controller has been energized are provided. An electric motor controller configured to be coupled to an electric motor includes a plurality of power input lines configured to receive an alternating current (AC) input voltage from an AC power source, an energized line detection device configured to sense that a power input line has been energized by the AC power source, and configured to output an isolated signal, and a rectifier configured to convert the AC input voltage having a frequency to a direct current (DC) voltage. The controller also includes a computing device coupled downstream from the energized line detection device and configured to determine which input power line has been energized.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: October 31, 2017
    Assignee: Regal Beloit America, Inc.
    Inventors: Roger Carlos Becerra, Ludovic Andre Chretien, Yao Da, Peizhong Yi, Lester Benjamin Manz
  • Patent number: 9802644
    Abstract: An electronic power steering apparatus for a vehicle having a steering mechanism to generate a steering assisting force includes: a steering angle sensor; a steering torque sensor; a target steering torque setting unit for setting a target steering torque based on the detected steering angle; a torque deviation computing unit for computing a torque deviation between the target steering torque and the detected steering torque; a first target current value computing unit for computing a first target current value for generating a steering assisting force by the motor based on the computed torque deviation; and a vehicle speed sensitivity adjusting unit that adjusts the first target current value, at least corresponding to a detected vehicle speed, and outputs the adjusted first current value as a second target current value. The motor control unit controls the motor to generate the steering assisting force based on the second target current value.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: October 31, 2017
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kouji Nakamura, Kazuhiko Inaba, Shigenobu Sekiya, Tomohiro Morikami, Junichi Seto, Satoshi Kawabe, Norio Yamazaki
  • Patent number: 9802645
    Abstract: Provided is a steering reaction force control apparatus for a vehicle including a driving support device configured to control an electric power steering device via a controller so that a steered angle of steered wheels reaches a target steered angle. When the driving support device is operating, the controller calculates a target steering spring torque based on a corrected steering angle corrected by a target steering angle for driving support control. When the magnitude of the corrected steering angle is less than a reference value, the target steering spring torque is calculated so that the magnitude of the target steering spring torque becomes larger in a case where the driving support device is operating compared with a case where the driving support device is not operating.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: October 31, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshio Kudo
  • Patent number: 9806645
    Abstract: A robot system includes: a robot; a three-phase inverter having a high side switch and a low side switch connected in series; a power line electrically connecting a connection point between the high side switch and the low side switch to a stator winding of a motor; a short circuit path that electrically connects at least two lines of the power line; a brake switch arranged in the short circuit path to change the short circuit path to an open state or a closed state; a break detector that detects a disconnection of the power line; and an operation part that operates the brake switch from the open state to the closed state, when the break detector detects the disconnection.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: October 31, 2017
    Assignee: DENSO WAVE INCORPORATED
    Inventor: Hideyuki Nishino
  • Patent number: 9796408
    Abstract: An electric steering device includes an electric actuator which generates a steering assist force for a steering mechanism of a vehicle, a control unit which controls the steering assist force generated from the electric actuator based on an operation of a steering wheel by a driver, an ignition signal detection unit which detects presence or absence of an ignition signal of the vehicle, and a speed acquisition unit which acquires a running speed of the vehicle. In a case that the ignition signal is not detected and the running speed is a predetermined speed or more, the control unit reduces an upper limit of the steering assist force generated from the electric actuator so as to be smaller than an upper limit in a case that the ignition signal is detected.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: October 24, 2017
    Assignee: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Hiroki Yamanaka, Masayuki Hashiguchi
  • Patent number: 9796409
    Abstract: In a power steering device and a vehicle-mounted instrument, an abnormality detection accuracy of a state quantity detection means is increased. In an electric power steering device and a vehicle-mounted instrument that are each provided with a plurality of state quantity detection means, an abnormality detection for the state quantity detection means is carried out by comparing detection signals issued from the state quantity detection means provided on a redundant system, and by comparing the detection signals issued from the state quantity detection means with signals that are issued from other state quantity detecting means and calculated to be matched with the same unit as the compared detection signals, a value or close value that is possessed by the largest number of signals is set as a normal value.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: October 24, 2017
    Assignee: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Mitsuo Sasaki, Takumi Hisazumi
  • Patent number: 9783227
    Abstract: A vehicle steering device (11) is provided that performs steering of a vehicle in response to operation of a steering wheel (13) operated when the traveling direction of the vehicle is changed. The vehicle steering device (11) includes a first steering assist device having a first steering torque sensor (23), a first assist motor (51), and a first EPS control unit (37), and a second steering assist device having a second steering torque sensor (25), a second assist motor (57), and a second EPS control unit (39). The first and second EPS control units (37, 39) perform driving control of the first and second assist motors (51, 57) independently from each other. Even if either one of the two control units (37, 39) respectively controlling driving of the two assist motors (51, 57) fails into an abnormal situation, such an abnormal situation can be brought under control quickly and soundly.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: October 10, 2017
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yasuo Shimizu, Atsuhiko Yoneda, Yukihiro Wakakuwa
  • Patent number: 9776527
    Abstract: A method for controlling a vehicle driveline includes connecting an electric motor to each of respective vehicle wheels, determining from driver input a magnitude of demanded wheel torque, determining speed of each wheel, using demanded wheel torque and the respective wheel speed to determine from a power loss map a current power loss for each motor, and transmitting power from the motor having the lowest current power loss to the respective vehicle wheel.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: October 3, 2017
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Arnulf Sponheimer, Monika Derflinger, Roger Graaf, Marc Simon
  • Patent number: 9771103
    Abstract: A method of controlling disturbances associated with electric power steering (EPS) systems maintains an original assist torque to feedback signal in the EPS, such as a column torque, and further minimizes the impact from the disturbance source to the feedback signal so that the disturbance is rejected while the original steering feel is maintained. The method further considers interaction of the rejection feature with other functions of the EPS. In one embodiment, relationships for isolating the disturbance are achieved by utilizing a combined feedback and feed-forward compensator.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: September 26, 2017
    Assignee: TRW Automotive U.S. LLC
    Inventors: Yun She, Arnold H. Spieker, Chris Mantjios, Keiwan Kashi
  • Patent number: 9764758
    Abstract: An electric power steering system includes a basic assist amount calculation section calculating a basic assist amount for assisting the manipulation of a steering wheel, and an assist compensation amount calculation section calculating an assist compensation amount for correcting the basic assist amount. The system includes an assist amount correction section calculating a corrected assist amount by correcting the basic assist amount based on the assist compensation amount, and a motor drive section driving a motor using the corrected assist amount. The assist compensation amount calculation section uses a reverse input specification that more transmits the signal components of specific frequency in road-surface input torque, to a steering wheel than in the case of using only the basic assist amount, and calculates the assist compensation amount suitable for a vehicle-state value, such as a steering torque, to suppress variation in the transmission characteristics due to variation of the vehicle-state value.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: September 19, 2017
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hisaya Akatsuka, Daiji Watanabe, Motoaki Kataoka, Yoshio Kudo, Yoshiaki Suzuki
  • Patent number: 9738309
    Abstract: A system for actively damping a power steering system includes a damping activation module that generates a damping activation signal based on a motor velocity signal, a t-bar torque signal, and a final motor command; a command calculation module that generates a calculated command based on the motor velocity signal and a vehicle speed signal; and a damping calculation module that generates a damping command based on the damping activation signal and the calculated command, the damping command reduces a motor velocity of a motor of the power steering system to mitigate a rack disturbance.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: August 22, 2017
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Tejas M. Varunjikar, Ashok Chandy, Michael A. Eickholt
  • Patent number: 9738308
    Abstract: A control device (50) for an electric power steering device (10) is configured to: store a basic target return speed (Vrb), which increases in magnitude as the magnitude of a steering angle (?) increases; calculate, when a steering wheel (14) is being returned to a neutral position, the basic target return speed (Vrb) based on an actual steering angle (Step 10); calculate a transitional target return speed (Vtrt), which gradually increases in magnitude and gradually approaches the basic target return speed as the magnitude of the actual steering wheel decreases; and control, when the magnitude of a difference between the basic target return speed and the transitional target return speed is more than a reference value, a steering assist torque so that a return speed reaches the transitional target return speed (Step 20 to Step 160).
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: August 22, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masao Ueyama, Yoji Kunihiro, Yoshiaki Suzuki, Takahiro Kojo
  • Patent number: 9731751
    Abstract: A steering system includes a steering mechanism, a motor that is a source of an assist force, and a battery that supplies a voltage to the motor. The system includes a voltage sensor that detects a power supply voltage, a steering sensor that detects a steering angle, and a motor control signal generation circuit that calculates a q-axis voltage command value to allow the motor to generate the assist force and that generates a motor control signal based on the q-axis voltage command value. The system includes a steering-angular-velocity limiting circuit that calculates a compensation amount for compensation for the q-axis voltage command value and that derives the compensation amount by calculating a power supply compensation component based on the power supply voltage when the absolute value of the steering angle is equal to or larger than a predetermined steering angle close to a maximum steering angle.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: August 15, 2017
    Assignee: JTEKT CORPORATION
    Inventor: Hiroshi Kawamura
  • Patent number: 9731757
    Abstract: A vehicle comprising a closed-loop electric power assisted steering (EPAS) system comprising a control unit configured to compute an artificial friction component and to compute a desired reference torque (?ref) incorporating the artificial friction component, wherein the artificial friction component is dependent upon steering wheel angle (?).
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: August 15, 2017
    Assignee: Jaguar Land Rover Limited
    Inventors: Alex Bean, Paolo Pucci
  • Patent number: 9725111
    Abstract: Output signals of a torque sensor include a first output signal used in an assist control and a second output signal used in controls other than the assist control. An adjusting device of an electric power steering device includes an input torque meter for measuring an input torque applied to the input shaft, an output torque meter for measuring an output torque output by the steering mechanism, and a sensor output corrector for correcting an output signal of the torque sensor. The sensor output corrector corrects the first output signal so that a relationship between the input torque measured by the input torque meter and the output torque measured by the output torque meter becomes an ideal characteristic set in advance, and corrects the second output signal so that an input torque detected by the torque sensor coincides with the input torque measured by the input torque meter.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: August 8, 2017
    Assignee: KYB Corporation
    Inventors: Hideo Maehara, Ryota Yamada
  • Patent number: 9725117
    Abstract: A parking assist system parks a vehicle at a target parking position by automatically steering an EPS. The parking assist system includes a acquiring unit configured to acquire the position of the vehicle, a position determining unit configured to determine the target parking position, a generating unit configured to generate a path from the position of the vehicle to the target parking position, a detecting unit configured to detect the temperature of the EPS, and a assist unit configured to automatically steer the vehicle so as to move along the path generated by the generating unit. The generating unit generates a path in which a degree of stationary steering by which the vehicle is steered in a state where the vehicle stops is small when the temperature of the EPS is high, compared with when the temperature of the EPS is low.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: August 8, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yu Hiei, Ryuji Okamura, Koichiro Yamauchi
  • Patent number: 9725112
    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that is capable of positively returning a steering wheel to a neutral point in such a running state as to return to a going straight state by calculating a return control current corresponding to a steering angle and a steering speed and compensating a current command value.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: August 8, 2017
    Assignee: NSK LTD.
    Inventor: Tetsuya Kitazume
  • Patent number: 9712090
    Abstract: A driving device for motors for drive wheels of a vehicle includes a plurality of in-wheel motor assemblies and motor drivers. The motor drivers include a smoothing circuit, an inverter unit to convert the direct current power, inputted through the smoothing circuit, into a three phase alternating current power, an inverter control unit for controlling the inverter unit, and a cooler for cooling the inverter unit. The plurality of the motor drivers are disposed within a single common casing and the plurality of the motor drivers share the smoothing circuit. The inverter control unit of the plurality of the motor drivers is of a control type capable of driving the driving element of the inverter unit according to the PWM scheme and the plurality of the motor drivers have equal cycles of PWM relative to each other and are configured to displace ON and OFF timings of the driving element.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: July 18, 2017
    Assignee: NTN CORPORATION
    Inventors: Hiroyuki Yamada, Takeshi Kanda, Koichi Okada
  • Patent number: 9663138
    Abstract: A core of a worm wheel has an axial end surface formed with a first annular recess, another axial end surface formed with a second annular recess, and a third annular recess formed in a radially outer region of the first annular recess. A rim portion has a first inner circumferential portion fixed to the first annular recess, a second inner circumferential portion fixed to the second annular recess, and a protrusion engaged with the third annular recess.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: May 30, 2017
    Assignee: NSK LTD.
    Inventors: Haruhiko Kiyota, Takeshi Yamamoto, Fumiaki Mitsuhashi
  • Patent number: 9663143
    Abstract: A control unit for an electric power steering apparatus that controls a motor based on a current command value (2) calculated based on a current command value (1) due to steering torque generated on a steering shaft and a current detection value of the motor providing a steering mechanism with a steering assist force. The apparatus includes an SAT estimating section that inputs a motor angular velocity, a motor angular acceleration, the current command value (1) and the steering torque, and estimates a self-aligning torque (SAT) or measures by a sensor; and a feedback section that processes the estimated SAT value and outputs an SAT compensation value. The feedback section comprises a BPF, a dead band section, a steering torque sensitive gain section and a vehicle velocity sensitive gain section. The current command value (2) is obtained by adding the SAT compensation value to the current command value (1).
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: May 30, 2017
    Assignee: NSK LTD.
    Inventor: Takahiro Tsubaki
  • Patent number: 9667179
    Abstract: A multi-phase motor control apparatus that reduces the occurrence of the vibrations and the noises by setting the shift amount per time more finely after realizing a reduction in processing ability of a CPU by using a one-shunt type current detection circuit and an electric power steering apparatus using the same. The apparatus includes a PWM-signal generating section that generates plural second each-phase PWM-signals within two control periods based on the current estimation value and the carrier signal, and in a case that a phase shift amount of a predetermined phase in a just before control period is zero and a phase shift amount of a predetermined phase in a present control period is not zero, the phase shift control section gradually increases the phase shift amount from zero in the present control period and a next control period, and uses the second each-phase PWM-signals in the next control period.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: May 30, 2017
    Assignee: NSK LTD.
    Inventors: Takayoshi Sugawara, Yousuke Imamura, Hiroyasu Kumagai
  • Patent number: 9651437
    Abstract: A torque steering angle sensor is provided. The sensor includes a ring magnet with magnetic poles, magnetic path forming members to vary in location relative to the magnetic poles depending on torsion of a torsion bar, one pair of magnetic flux collecting rings for the magnetic path forming members, a first detecting element to detect a magnetic field between the flux collecting rings, a second detecting element to receive a magnetic field from the ring magnet, a slide magnet for producing a magnetic field in a different direction from that of the magnetic field of the ring magnet in the second detecting element, and a sliding mechanism to move the slide magnet toward or apart from the second detecting element with rotation of a rotary member of an electrically assisted power steering device. The second detecting element detects the magnetic fields received from the ring magnet and the slide magnet.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 16, 2017
    Assignee: Hitachi Metals, Ltd.
    Inventor: Yukio Ikeda
  • Patent number: 9650031
    Abstract: A method for supplying power to an electrically assisted steering system is described. In one example, the method adjusts alternator field current to increase energy supplied to the electrically assisted steering system in response to an automatic engine stop request. The method may improve operation of the electrically assisted steering system.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: May 16, 2017
    Assignee: Ford Global Technologies, LLC
    Inventors: Alex O'Connor Gibson, Allan Roy Gale, John Anthony DeMarco, Robert Michael Grant