Incipient Or Imminent Skid Measured Patents (Class 303/175)
  • Patent number: 11479248
    Abstract: A vehicle control apparatus is provided with: a recognizer configured to recognize a surrounding situation of a host vehicle; a controller programmed to perform a deceleration control when a deceleration target is recognized by the recognizer; and a detector configured to detect a slip of the host vehicle. The controller sets a first controlled variable, which is a controlled variable associated with the deceleration control when the slip of the host vehicle is detected without execution of the deceleration control, so as to suppress an extent of deceleration of the host vehicle, in comparison with a second controlled variable, which is the controlled variable when the slip of the host vehicle is not detected without execution of the deceleration control.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: October 25, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shogo Ito, Masahiko Adachi, Kohei Tochigi, Yuta Ikezawa
  • Patent number: 9840249
    Abstract: A control method for a clutch of a hybrid electric vehicle including a series and parallel type of hybrid transmission, may include determining whether the hybrid electric vehicle may be operating as the parallel type, determining a hydraulic pressure of the clutch according to a demand torque of a driver when the hybrid electric vehicle may be operating as the parallel type, determining a target value of torque blending which blends a front side torque of the clutch with a motor torque and performing the torque blending, increasing the target value of the torque blending until a clutch slip may be generated, stopping the torque blending when the clutch slip may be generated, and learning a hydraulic pressure of the clutch corresponding to the front side torque of the clutch at a time when the clutch slip may be generated.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: December 12, 2017
    Assignee: Hyundai Motor Company
    Inventor: Kum Lim Choi
  • Patent number: 8924120
    Abstract: A regenerative brake control system for a vehicle includes a vehicle controller, a driveline torque distribution device interfacing with the vehicle controller, an electric machine interfacing with the driveline torque distribution device, a plurality of wheels coupled to the electric machine and at least one traction condition input indicating traction of the plurality of wheels provided to the vehicle controller. The vehicle controller engages the driveline torque distribution device and the electric machine apportions regenerative brake torque to the wheels in proportion to the traction of the wheels. A regenerative brake control method for a vehicle is also disclosed.
    Type: Grant
    Filed: June 6, 2009
    Date of Patent: December 30, 2014
    Assignee: Ford Global Technologies, LLC
    Inventor: William Paul Perkins
  • Patent number: 8538654
    Abstract: Systems and methods disclosed herein may be useful for braking systems for use in, for example, an aircraft. A method is disclosed comprising determining, at a brake controller, an aircraft reference speed for an aircraft having a first wheel and a second wheel, identifying, at the brake controller, a state comprising the first wheel having a different rotational velocity than the second wheel, wherein the difference in rotational velocity sums to about zero, calculating, at the brake controller, a compensation factor for at least one of the first wheel and the second wheel, and adjusting, at the brake controller, a locked wheel trigger velocity in accordance with the compensation factor.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: September 17, 2013
    Assignee: Goodrich Corporation
    Inventor: Eric D. Cahill
  • Patent number: 8352142
    Abstract: A brake control apparatus includes: a master cylinder; a wheel cylinder; a hydraulic pressure source; a control valve arranged to increase or reduce the pressure of the wheel cylinder; an outside gate valve arranged to connect or disconnect between the master cylinder and the wheel cylinder; a brake operation sensing section configured to sense a driver's brake operation; and a control unit configured to control the hydraulic pressure source, the control valve, and the outside gate valve, to perform an automatic-brake pressure-increasing control to control the outside gate valve in a valve closing direction, to drive the hydraulic pressure source, and thereby to increase the pressure of the wheel cylinder in accordance with a vehicle condition, and to increase a driving quantity of the hydraulic pressure source when the brake operation is sensed during the automatic-brake pressure-increasing control.
    Type: Grant
    Filed: June 18, 2009
    Date of Patent: January 8, 2013
    Assignee: Hitachi, Ltd.
    Inventor: Shinichiro Nishida
  • Patent number: 8210620
    Abstract: According to the braking force control system of the present invention it is prevented that the braking root pressure is increased unnecessarily high when the braking force increase suppressing control was initiated during the execution of the brake assist control without losing the effects of increasing the braking force available when the brake assist control only is executed.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: July 3, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Yasuji Mizutani
  • Patent number: 7937194
    Abstract: A method of reducing wheel slip and wheel locking in an electric traction vehicle includes receiving in a first controller a first signal value representative of a first amount of torque to be applied to at least one wheel of the electric traction vehicle by a motor coupled to the wheel and to the first controller, and a second signal value representative of a reference speed of the electric traction vehicle. The first and second signal values are generated by a second controller in communication with the first controller. The method also includes receiving in the first controller a third signal value representative of a speed of the at least one wheel, determining in the first controller a torque output signal using the first, second, and third signal values; and transmitting the torque output signal from the first controller to the motor.
    Type: Grant
    Filed: September 27, 2005
    Date of Patent: May 3, 2011
    Assignee: Oshkosh Corporation
    Inventors: Nader Nasr, Peter Werner
  • Patent number: 7744167
    Abstract: The adaptive brake application and initial skid detection system allows rapid brake application and prevents deep initial skids. Brake pressure is compared with a predetermined threshold brake pressure. Wheel velocity error signals are also generated to indicated the difference between the wheel velocity and a reference velocity signal. A pressure bias modulator integrator responsive to brake pressure signals adjusts the wheel velocity error signals to provide an anti-skid control signal. The pressure bias modulator integrator can also be initialized to the value of the measured brake pressure when the wheel velocity error signals indicate the beginning of a skid. Brake pressure difference signals are generated to indicate the difference between brake pressure and a commanded brake pressure, and an adjusted brake pressure error signal is generated in response to the brake pressure difference signals.
    Type: Grant
    Filed: May 13, 2008
    Date of Patent: June 29, 2010
    Assignee: Hydro-Aire, Inc.
    Inventors: Bijan Salamat, Robert D. Cook
  • Patent number: 7240972
    Abstract: A brake torque control device obtains inertia torque Tine based upon an equation of motion (Tine=Tw?Ft·Rt) about the rotation of a tire based upon a wheel torque Tw according to a brake torque exerted on the tire, road friction force Ft and a radius Rt of the tire. When the inertia torque Tine exceeds a predetermined reference value, road friction force Ft at this time is set as estimated maximum road friction force Fmax. The instructed brake torque is calculated under the condition that the value that is obtained by adding the predetermined value corresponding to the inertia torque Tine to the torque Fmax·Rt based upon this estimated maximum road friction force Fmax is set as an upper limit value of the instructed brake torque. This allows to clearly set, as one value, the target value of the instructed brake torque upon an ABS control, thereby being capable of more accurately executing the pressure-increasing control and pressure-reducing control of the brake fluid pressure.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: July 10, 2007
    Assignee: Advics Co., Ltd.
    Inventors: Keita Nakano, Motoshi Suzuki, Hiroaki Niino, Masato Yoshino
  • Patent number: 6502029
    Abstract: A system and method for ABS stability control is provided, the method comprising the steps of determining whether a first wheel is in an ABS mode; determining whether the first wheel is in an apply mode; determining whether a second parallel wheel is in the release mode; calculating an adjusted wheel slip if the first wheel is in the ABS mode, the first wheel is in the apply mode, and the second parallel wheel is in the release mode; and determining a control mode for the first wheel using the adjusted wheel slip.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: December 31, 2002
    Assignee: Delphi Technologies, Inc.
    Inventor: Kevin A. O'Dea
  • Patent number: 6357840
    Abstract: Upon detection of a potential transition from a low mu road surface to a high mu road surface, a rear wheel anti-lock brake system generates one dump pulse to increase the braking effort of the controller rear wheel as a test of the road surface. If the wheel accelerates following the test pulse, the transition is false and the anti-lock brake system continues as before. If the wheel does not accelerate following the test pulse, the transition is true and the anti-lock brake system proceeds to increase the braking effort of the controlled wheel brake.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: March 19, 2002
    Assignee: Kelsey-Hayes Company
    Inventor: Thomas M. Atkins
  • Publication number: 20020005662
    Abstract: A braking force control device, wherein wheel speed is detected and a slope of a braking force with respect to slip speed of the wheel is estimated on the basis of the detected wheel speed, a braking operation by which a brake pedal is depressed is detected and, on the basis of the detected braking operation conditions and estimated slope of the braking force, braking of the braking device to brake the wheels by a braking force generated in response to the braking operation by which the brake pedal is depressed is assisted.
    Type: Application
    Filed: April 4, 2001
    Publication date: January 17, 2002
    Inventors: Yoshiyuki Yasui, Takashi Yonekawa, Akira Tanaka, Hideyuki Suzuki, Mamoru Sawada
  • Patent number: 6241326
    Abstract: The control algorithm for a rear wheel anti-lock brake system includes a subroutine which proportions the applied braking force between front and rear wheel brakes of a vehicle during a braking cycle. The speed of the rear wheels is sensed and used to calculate an estimated vehicle deceleraion. Upon the estimated vehicle deceleration exceeding a deceleration threshold, an isolation valve is closed to hold the brake pressure applied to the vehicle rear brakes constant. Upon further increases of the estimated vehicle deceleration, the isolation valve is selectively opened to increase the rear brake pressure in proportion to the front brake pressure.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: June 5, 2001
    Assignee: Kelsey-Hayes Company
    Inventors: Steven C. Ferguson, Darren G. Graczyk
  • Patent number: 5957550
    Abstract: An antiskid brake system for an automotive vehicle is provided which is designed to accumulate a wheel slippage parameter indicating a slippage condition of each wheel for given program cycles and regulate the brake pressure acting on each wheel based on the accumulated wheel slippage parameters. This improves the instability of antiskid brake control due to a small variation in tire-road adhesive .mu., irregularities of a road surface, turning of the vehicle, or a difference in diameter between tires. The antiskid brake system is alternatively designed to determine a slippage condition of one of wheels of a vehicle equipped with a rotation restraint mechanism such as an limited slip differential not only based on a slippage ratio of the one of the wheel, but also based on a slippage ratio of the other of the wheels. This permits a braking force acting on each of the wheels to be regulated precisely.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: September 28, 1999
    Assignee: Denso Corporation
    Inventor: Takashi Watanabe
  • Patent number: 5522652
    Abstract: A method and system are disclosed for controlling an anti-lock brake system based on vehicle deceleration. The system includes a wheel speed sensor and control unit for performing the method steps of sensing a wheel speed and determining a wheel deceleration and a vehicle deceleration therefrom. The control unit also performs the method steps of determining an initial deceleration threshold representing a pre-lockup condition, determining a final deceleration threshold based on the vehicle deceleration, comparing the wheel deceleration to the final deceleration threshold, and activating the vehicle anti-lock brake system if the wheel deceleration exceeds the final deceleration threshold.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 4, 1996
    Assignee: Kelsey-Hayes Company
    Inventors: Dan Negrin, Darryl C. Weber
  • Patent number: 5454630
    Abstract: A brake control system maximizes braking efficiency under uneven driving surface conditions by including a capability to detect change in normal force at the tire-driving surface interface and to include detected change in tire normal force in the detection of incipient wheel lockup conditions and in the determination of appropriate brake pressure command adjustments when such lockup conditions are detected.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: October 3, 1995
    Assignee: General Motors Corporation
    Inventor: Zhihong Zhang