Pulse Frequency Or Time Period Controlling Pressure Rebuild Patents (Class 303/156)
  • Patent number: 10807578
    Abstract: A method for controlling a solenoid valve current of a brake system may include: determining, by a controller, whether a difference between the pressure of a master cylinder and the pressure of a wheel cylinder is equal to or more than a preset reference value; and forming, by the controller, the pressure of the wheel cylinder by applying a sine wave pattern to an on/off control pattern while applying a current to a solenoid valve for adjusting the pressure of the wheel cylinder such that the pressure of the wheel cylinder is changed in an LMV control manner based on an upward sloping pattern, when the determination result indicates that the difference between the pressure of the master cylinder and the pressure of the wheel cylinder is equal to or more than a preset reference value.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: October 20, 2020
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Jae Il Lim
  • Patent number: 10549735
    Abstract: A hydraulic pressure braking force generation device is provided with a first control unit for performing control for inhibiting excessive responses in which the input pressure is controlled such that the output pressure is within a first region set using a braking target oil pressure as a reference, a second control unit for performing control for responsiveness in which the increase speed or decrease speed of the input pressure is increased so as to be larger than that in the control for inhibiting excessive responses, to cancel response delay and a switching unit which, on the basis of the state of the braking target oil pressure, switches between the control for inhibiting excessive responses performed by the first control unit and the control for responsiveness performed by the second control unit.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: February 4, 2020
    Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaki Ninoyu, Takahiro Okano
  • Patent number: 10388088
    Abstract: A roll and brake test system and a method of controlling the same are disclosed. The roll and brake test system can automatically test a steering device, an accelerator, a transmission, and a brake of a vehicle. The roll and brake test system includes: a roll and brake apparatus for accommodating a vehicle on a roll; a management apparatus for controlling the roll and brake apparatus and for generating test information for testing the vehicle; and a control apparatus for controlling the vehicle according to the test information from the management apparatus.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: August 20, 2019
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Jihoon Park, Jin Seok Kim, David Oh
  • Patent number: 10293797
    Abstract: A method for avoiding false excitations of a slip control system comprises monitoring of a wheel speed signal for a predefined first monitoring time period for the start of a negative half-wave of an oscillation applied to a vehicle wheel, when a brake pressure gradient initiated by a brake start rises above a predetermined threshold. A ruck signal is derived from the wheel speed signal. An acceration signal is derived from the wheel speed signal during a predetermined second monitoring period. The wheel speed signal is monitored for a turning point of the ruck signal and a start of the acceleration signal. The oscillation imposed on the vehicle wheel is identified as a braking-induced vibration, and slip control is not carried out when the turning point of the ruck signal and the re-acceleration of the wheel are detected.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: May 21, 2019
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Manuel Kasten, Henning Kerber, Jochen Müller, Mario Roszyk
  • Patent number: 10166957
    Abstract: A hydraulic brake system for a land vehicle including a hydraulic connection between a master cylinder and wheel brakes that is established or blocked by valve arrangements in dependence upon trigger signals from an electronic control with the electronic control unit devised and programmed in such a way that, in order to set a brake pressure characteristic required for a specific vehicle behavior, the electronic control unit supplies trigger signals through which the setting of a respective brake pressure characteristic in two brake circuits in predefined pressure stages (delta-p) is staggered in terms of time by a substantially predefined time stage (delta-t).
    Type: Grant
    Filed: June 8, 2006
    Date of Patent: January 1, 2019
    Assignee: Lucas Automotive GmbH
    Inventors: Thomas Bach, Harald Thelen, Josef Knechtges, Bernd Schmitt, Christian Chemnitz
  • Patent number: 9725079
    Abstract: For traction control, different filters, i.e., a hydraulic-pressure-increase filter and a hydraulic-pressure-decrease filter, are provided for increasing and decreasing target pressure, respectively. The inhibiting effect that the hydraulic-pressure-increase filter exhibits with respect to target pressure changes is made less than the inhibiting effect that the hydraulic-pressure-decrease filter exhibits with respect to changes in the target pressure, and so the target pressure is increased quickly but decreased slowly. As such, even if the wheel-cylinder pressure decreases subsequent to the actual wheel-cylinder pressure having increased to follow the target pressure, the wheel-cylinder pressure decreases only gradually, reducing the amount of pressure increase needed to reach the target pressure when the wheel-cylinder pressure is next increased.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: August 8, 2017
    Assignee: ADVICS CO., LTD.
    Inventors: Yasuhito Ishida, Yusuke Nakagawa, Ken Kudo
  • Patent number: 9701295
    Abstract: In a method for controlling a selector valve situated in a hydraulic brake system of a motor vehicle, the selector valve is opened by applying an electrical signal having various control phases having different current intensities. The thermal load and the noise of the valve are significantly improved if the lengths of the control phases for the pilot stage or the holding phases are variably adapted to the driving situation.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: July 11, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Michael Bunk, Jose-Maria Rodelgo Lucas
  • Patent number: 9385637
    Abstract: A system and method for controlling a brake coil in a motor having a control processor and a controller in communication with the control processor, the controller comprising a processor and memory with instructions stored thereon when executed by the processor cause the controller to receive signals indicative of threshold current values for the brake coil; provide enabling signals to each of a high-side and low-side driver circuit; receive signals indicative of a sensed current in the brake coil; compare the sensed current with the threshold current values; and provide an adjustment signal if the sensed current is outside a known range of values for the threshold current values.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: July 5, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Eugene W. Dolfi
  • Patent number: 9352732
    Abstract: An anti-blocking system for a vehicle having an electromotive vehicle drive unit includes one or more driving motors. During a braking process, the braking effect of the driving motors operating as a generator is limited in such a way that brake slip on at least one driving wheel is limited to a predefined threshold value. The rotational speed of each driving motor is regulated by a controllable converter associated therewith, the ABS control device constantly transmitting, to each converter, a mandatory minimum braking rotational speed for the driving motor associated with the respective converter in order to limit brake slip.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: May 31, 2016
    Assignee: AUDI AG
    Inventors: Sebastian Loos, Dirk Hirschmann, Bodo Kleickmann
  • Patent number: 9227606
    Abstract: A method for operating a braking system of a vehicle having at least one brake-able wheel, a braking force variable, which represents a braking force, of a braking device associated with the wheel being increased during a braking operation until a locking tendency of the wheel is recognized, and then reduced to a certain value. It is provided that the braking force variable is subsequently set to a setpoint braking force variable, which corresponds to a selectable portion of the braking force variable present at the recognition of the locking tendency, for a certain time period. Also described is a control unit for implementing the method.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: January 5, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Alfred Strehle, Stefan Diehle, Achim Eisele
  • Patent number: 9168903
    Abstract: One embodiment provides a vehicle brake hydraulic controller including a wheel speed acquiring section; a wheel deceleration calculator; a vehicle velocity calculator; and a locking tendency determination section. The vehicle velocity calculator calculates a vehicle deceleration based on a temporary vehicle deceleration corresponding to an acceleration sensor value and calculates a vehicle velocity based on the calculated vehicle deceleration. The vehicle velocity calculator calculates the temporary vehicle deceleration by offsetting a first correction amount to a deceleration side in relation to the acceleration sensor value. When a brake pedal operation amount by a driver is equal to or smaller than a first threshold and that an absolute value of the wheel deceleration is equal to or larger than an absolute value of a second threshold are met, the first correction amount is set to be smaller than when the conditions are not met.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: October 27, 2015
    Assignee: NISSIN KOGYO CO., LTD.
    Inventors: Nobuyoshi Kato, Tomonori Hirose, Tomoaki Sekiya
  • Patent number: 9145114
    Abstract: A method for ensuring a braking effect utilizes a service brake system and a parking brake system of a vehicle. The service brake system is configured to be actuated irrespective of a driver input, and the parking brake system is activated by an extraneous force, for example in an electromechanical arrangement. When a deceleration request is received, the service brake system is initially actuated. If a deceleration variable remains below a target value and the measured slip is smaller than a slip threshold value, the parking brake system is actuated in order to bring the vehicle to a standstill.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: September 29, 2015
    Assignee: CONTINENTAL TEVES AG & CO. OHG
    Inventor: Torsten Bajorat
  • Patent number: 9073525
    Abstract: In a brake apparatus, an activation current for opening a simulator cut valve from a closed state is applied, whereupon a steady-state current is applied continuously to maintain the open state. A brake control apparatus and a brake control method are employed to perform control in which a valve opening current, which is higher than the steady-state current, is applied to the simulator cut valve every time a brake pedal is depressed. Thus, in a brake apparatus including a switch valve that is driven steadily by applying the steady-state current thereto, favorable control responsiveness can be maintained in the switch valve at all times while achieving a reduction in power consumption.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: July 7, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tsukasa Fukasawa, Takahiro Okano, Daisuke Nakata, Eiji Nakamura
  • Patent number: 9033429
    Abstract: A brake control device for a brake system. The control device can perform both an interlocking brake control and an antilock brake control. The brake system includes a front-wheel hydraulic circuit, a front-wheel-side braking part; a rear-wheel hydraulic circuit, a rear-wheel-side braking part; and an electrically-operated pump which pressurizes the brake fluid. The brake control device includes a usual voltage mode where the interlocking brake control or the anti-lock brake control is performed when the supply voltage is a first voltage or more, and a low voltage mode where at least one of the interlocking brake control and the anti-lock brake control is performed in a limited manner when the supplied voltage is a second, lower voltage. An operation mode is changed from the usual voltage mode to the low voltage mode when it is determined that the supply voltage becomes lower than the first voltage.
    Type: Grant
    Filed: October 13, 2010
    Date of Patent: May 19, 2015
    Assignees: Bosch Corporation, Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Kazuma Waida, Kenichi Jino, Manabu Kokawa, Junya Iwatsuki, Shunsaku Ono
  • Patent number: 8996268
    Abstract: A method is provided for controlling a brake system of a motor vehicle having a brake device (40) with a hydraulic brake unit (41) and a recuperation brake unit (42). The method includes calculating (S1) a hydraulic brake force characteristic curve (B2) of the hydraulic brake unit (41) on the basis of at least one detected characteristic of the brake system, selecting (S2) a generator-based brake force characteristic curve (G1-G4) of the recuperation brake unit (42) on the basis of a predefined criterion and as a function of the calculated hydraulic brake force characteristic curve (B2), and controlling (S3) the hydraulic brake unit (41) and the recuperation brake unit (42) in accordance with a detected degree of actuation of the brake pedal (10), the calculated hydraulic brake force characteristic curves (B2), and the selected generator-based brake force characteristic curve (G1-G4).
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: March 31, 2015
    Assignee: Dr. Ing. h.c.F. Porsche Aktiengesellschaft
    Inventors: Thomas Garbe, Bjoern-Hendrik Reinhard
  • Patent number: 8876224
    Abstract: A vehicular brake fluid pressure control apparatus includes: normally open and normally closed electromagnetic valves disposed to correspond to plural wheel brakes; and a control unit which controls fluid pressures transmitted to the wheel brakes by controlling drive currents applied to the electromagnetic valves according to plural different fluid pressure control modes. The control unit controls the normally closed electromagnetic valves while switching, according to which of the fluid pressure control modes is effective, between a responsivity priority control in which drive currents applied to the normally closed electromagnetic valves are increased to a target current value instantaneously at a first slope, a silence priority control in which the drive currents are increased at a second slope gentler than the first slope, and an intermediate control in which the drive currents are increased at a third slope gentler than the first slope and steeper than the second slope.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: November 4, 2014
    Assignee: Nissin Kogyo Co., Ltd
    Inventors: Takuyo Shimono, Masaya Shigeta
  • Patent number: 8831850
    Abstract: A brake control method for a hydraulic brake device equipped with an actuator that automatically regulates braking liquid pressure in a wheel cylinder of a vehicle without driver intervention. The method includes: (a) calculating a time period in which holding or decreasing brake hydraulic pressure is continuously performed to the wheel cylinder; and (b) controlling the actuator such that, an increasing pressure and decreasing pressure to the wheel cylinder after the calculated time period has reached a predetermined time, the amount of the pressure increase and the amount of the pressure decrease are the same.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: September 9, 2014
    Assignee: Bosch Corporation
    Inventor: Shunsaku Ono
  • Patent number: 8706376
    Abstract: To provide an ABS control system and software with an automatic parameter calibration function. An ABS control system according to the present invention includes an electronic control unit (ECU), a wheel speed sensor, and a brake pressure sensor. The wheel speed sensor and the brake pressure sensor measure wheel speed and brake pressure during ABS braking, and the ABS control system automatically calibrates an internal parameter used in ABS control in response to the wheel speed and brake pressure measurement results.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: April 22, 2014
    Assignee: Bosch Corporation
    Inventors: Shunsaku Ono, Shuichi Miyagawa
  • Patent number: 8668281
    Abstract: A brake hydraulic pressure control device includes: a normally open linear solenoid valve configured to adjust a valve closing force depending on an power supply amount; a normally closed solenoid valve; and a controller configured to control switching of a hydraulic pressure within the wheel brake between a pressure increasing state, a pressure holding state, or a pressure reducing state, wherein: when shifting to the pressure increasing state from the pressure reducing state or the pressure holding state is made, the controller controls the power supply amount so that increasing is made at a first gradient up to a turning point target hydraulic pressure, and increasing is made at a second gradient gentler than the first gradient from the turning point target hydraulic pressure up to the end of the increasing; and the controller determines the turning point target hydraulic pressure.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: March 11, 2014
    Assignee: Nissin Kogyo Co., Ltd.
    Inventor: Tomonori Hirose
  • Patent number: 8444229
    Abstract: A method for preventing a valve orifice from switching to the small size when a high build gradient is required includes briefly bleeding off a small amount of fluid at the upstream side of the valve. This momentarily reduces the pressure difference when beginning the pressure build. After the valve is opened with the large orifice, the fluid flow through the valve prevents a high pressure difference. The resulting build with the large orifice has the maximum pressure gradient.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: May 21, 2013
    Assignee: Ford Global Technologies
    Inventors: Michael Edward Brewer, Todd Allen Brown
  • Patent number: 8444230
    Abstract: A vehicle motion control apparatus includes hydraulic pressure applying means for applying hydraulic pressure to a wheel cylinder side of any of plural solenoid valves, respectively arranged between a master cylinder and plural wheel cylinders, for the corresponding wheel cylinders even when an operator of the vehicle does not operate a brake operation member, motor controlling means for controlling an output of the electric motor to be reduced in accordance with a condition of a road surface when the hydraulic pressure is applied to the wheel cylinder, and valve controlling means for controlling the operation of the solenoid valve to increase an amount of the brake fluid flown by the operation of the solenoid valve before the output of the electric motor is reduced when the output of the electric motor is controlled to be reduced.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: May 21, 2013
    Assignee: Advics Co., Ltd.
    Inventors: Atsushi Ikematsu, Toshihisa Kato
  • Patent number: 8342616
    Abstract: An object of the invention is to reduce an influence of deviation in pressure increasing performance, which would be caused by individual differences of pressure increase valves, so that a desired braking force may be obtained. A moderate pressure increasing operation is carried out for wheel cylinder pressure of a wheel, which is on a high ?-road, wherein a demand differential pressure for a pressure increase valve is set at a first target pressure for a first time period and then switched to a second target pressure for a second time period. The influence of the deviation may be absorbed during the moderate pressure increasing operation, so that a difference of wheel cylinder pressure between front left and front right wheels may be reduced.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: January 1, 2013
    Assignee: Advics Co., Ltd.
    Inventor: Mototsugu Sawada
  • Patent number: 8204663
    Abstract: A vehicle control apparatus controlling a driving force or a braking force to be applied to a vehicle and conducting a vehicle control based on wheel speeds includes a detecting means detecting the wheel speed of each wheel provided at the vehicle, a storing means storing a predetermined valid wheel speed for each wheel, a determining means determining whether a difference between the detected wheel speed and a maximum wheel speed of the wheel speeds lies in a predetermined range, and an updating means updating the valid wheel speed based on the detected wheel speed of the wheel, when the detected wheel speed is lower than the predetermined valid wheel speed which is currently stored, in case that a result determined by the determining means is positive.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: June 19, 2012
    Assignee: Advics Co., Ltd.
    Inventors: Yasuhito Ishida, Gen Inoue
  • Patent number: 7992947
    Abstract: A method for activating a two-stage switching valve including a first stage which has a small flow cross-section and a second stage which has a larger flow cross section, the switching valve being situated between a main brake cylinder and a hydraulic pump in a hydraulic brake system. The pressure equalization knock on opening the switching valve is substantially reduced by activating the switching valve in a first control phase via a control signal having a low amplitude, due to which only the first stage of the valve is first opened, and by activating the valve in a second phase via a control signal having a higher amplitude.
    Type: Grant
    Filed: October 7, 2004
    Date of Patent: August 9, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Frank Kaestner, Thomas Bruex, Andreas Grimm, Otmar Bussmann
  • Patent number: 7925411
    Abstract: A method of controlling a brake system of an all-wheel driven motor vehicle, which includes an electro-regenerative brake and a number of friction brakes such that a total brake torque comprises brake torque components of the friction brakes and of the electro-regenerative brake; the brake torque of the electro-regenerative brake is subdivided between the front axle and rear axle in predetermined ratios. The brake torque generated by the electro-regenerative brake is limited to such an extent that the brake slip of one axle of the motor vehicle does not exceed a selectable maximum value.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: April 12, 2011
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Jochen Führer, Lothar Kienle, Gregor Schmitt
  • Patent number: 7857399
    Abstract: An anti-skid control apparatus controls the value of electric current, which is being applied to the first solenoid valve and equal to or greater than the predetermined electric current value, to a value of electric current corresponding to the pressure difference between the master cylinder pressure and the wheel cylinder pressure at a time point where the pressure-increasing control is started; and changes the value of electric current in a direction to be reduced for a first period of time during the pressure-increasing control as the estimated amount of the wheel cylinder pressure reduced by the pressure-reducing control is increased, when the estimated amount of the wheel cylinder pressure reduced by the pressure-reducing control is equal to or greater than a predetermined value.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: December 28, 2010
    Assignee: Advics Co., Ltd.
    Inventors: Yoshiaki Kito, Katsuo Obai
  • Patent number: 7699411
    Abstract: An ABS control apparatus employs a normally-open linear solenoid valve as a pressure-increasing valve, and repeatedly performs ABS control composed of pressure-reducing control and linear pressure-increasing control. This apparatus determines an initial value Pw0 of an estimated wheel cylinder pressure value Pw in consideration of brake operation time before start of ABS control Tstp and vehicle body deceleration at the start of a first-time ABS control, and then determines the estimated wheel cylinder pressure value Pw during the ABS control on the basis of the value Pw0 and the pressure-reducing characteristic of a pressure-reducing valve. This apparatus determines instruction current supplied to the pressure-increasing valve during the linear pressure-increasing control, while using an estimated differential pressure Pdiff (=(Pw0?Pw)+Pup1+Pup2), wherein Pup1 and Pup2 are set in accordance with the time Tstp and additional brake operation during the ABS control, respectively.
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: April 20, 2010
    Assignee: Advics Co., Ltd.
    Inventors: Toru Nakaura, Masato Terasaka, Yoshiaki Kito
  • Patent number: 7621602
    Abstract: A vehicle brake control device determines a first duty factor required to achieve a stable rotational speed of motors and a second duty factor required to achieve a change rate of a target wheel cylinder pressure. The vehicle brake control device selects the larger one of the determined duty factors as a for-use motor duty factor to be used in outputting currents to the motors. Therefore, with the stable rotational speed and the change rate of the target wheel cylinder pressure, it is possible to achieve quick response to a request for braking made by a driver while suppressing the electric energy consumption of the motors.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: November 24, 2009
    Assignee: Advics Co., Ltd.
    Inventors: Takashi Sato, Hiroaki Niino
  • Patent number: 7530648
    Abstract: The brake hydraulic pressure control apparatus employs, as a pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust an actual differential pressure (difference between master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure). This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, while a “linear pressure-increasing control with holding period” is executed instead of the linear pressure-increasing control only in the first-time control cycle that is started in a state where a current-value-corresponding-to-actual-differential-pressure cannot correctly be obtained.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: May 12, 2009
    Assignee: Advics Co., Ltd.
    Inventor: Katsuo Obai
  • Patent number: 7499785
    Abstract: A method for balancing brake force is disclosed. The method includes determining whether a deceleration value reaches a first deceleration threshold in response to a braking event and determining brake condition and vehicle motion. Based on brake condition and vehicle motion determination and the first deceleration threshold determination, the method determines whether the deceleration value reaches a second deceleration threshold, and applies threshold balancing when the second deceleration threshold is reached.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: March 3, 2009
    Assignee: Delphi Technologies, Inc.
    Inventors: Bryan P. Riddiford, Michael C. Pfeil, Richard J. Thomas
  • Patent number: 7278694
    Abstract: An anti-lock brake controller that is operable, upon detecting a potential wheel lock-up situation during a vehicle braking cycle, to cycle apply and dump valves associated with vehicle rear wheels continuously between apply and dump modes to determine an estimated maximum friction wheel slip. The controller then is further operable to utilize the estimated maximum friction wheel slip to determine reference velocities that are used to continuously control apply and dump valves associated with the vehicle front wheels to optimize vehicle braking.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: October 9, 2007
    Assignee: Kelsey-Hayes Company
    Inventors: S. Ben Choi, Danny Milot
  • Patent number: 7093913
    Abstract: The present invention relates to a method for traction control of slipping wheels of at least one driving axle, which are driven by way of an open differential gear and can be interlocked by braking intervention to a defined, predeterminable degree for effecting a differential lock function. The invention discloses that the wheel slip of the wheels is detected, that the detected wheel slip variation is compared with predetermined wheel slip patterns for recognizing and monitoring a current driving condition, and that a braking intervention effecting the differential lock function is performed when the sensed wheel slip variation coincides with at least one predetermined wheel slip pattern. The invention allows an accelerated adjustment and control of a differential lock effect depending on the respective driving condition.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: August 22, 2006
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Schahrad Schafiyha, Henning Raulfs, Carsten Dresch
  • Patent number: 6997524
    Abstract: A method for preventing a valve orifice from switching to the small size when a high build gradient is required includes briefly bleeding off a small amount of fluid at the upstream side of the valve. This momentarily reduces the pressure difference when beginning the pressure build. After the valve is opened with the large orifice, the fluid flow through the valve prevents a high pressure difference. The resulting build with the large orifice has the maximum pressure gradient.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: February 14, 2006
    Assignee: Ford Global Technologies LLC
    Inventors: Michael Edward Brewer, Todd Allen Brown
  • Patent number: 6984004
    Abstract: A method and a device for controlling at least one valve of a brake circuit using an electrical control variable, in which a characteristic curve which characterizes the relationship between the pressure drop across the valve and the electrical control variable has at least one region in which a change in the electrical variable results in a change in the pressure drop; and a starting value for the electrical control variable is selected during actuation of the valve such that the starting value is in this region or at the boundary of this region.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: January 10, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Juergen Breitenbacher, Andreas Klug, Alfred Strehle
  • Patent number: 6955408
    Abstract: A method and apparatus for controlling the brake system of a vehicle, in which pressure is built up and reduced in the wheel brakes by pulses having at least one changeable parameter. This at least one parameter is corrected as a function of at least one variable that influences the dynamics of the pressure change.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: October 18, 2005
    Assignee: Robert Bosch GmbH
    Inventor: Johannes Schmitt
  • Patent number: 6950738
    Abstract: An anti-lock controller controls the brake fluid pressure of a wheel brake to a pressure decreasing mode where a normally-opened electromagnetic valve is closed while a normally-closed electromagnetic valve is opened, a holding mode where the normally-opened electromagnetic valve is closed and the normally-closed electromagnetic valve is closed, and a pressure increasing mode where the normally-opened electromagnetic valve is opened while the normally-closed electromagnetic valve is closed.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: September 27, 2005
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hiromi Inagaki, Masaru Gotoh, Hidetoshi Kobori
  • Patent number: 6945612
    Abstract: A brake control system includes a brake line with a supply line, a pump for supplying brake fluid to the supply line, branch lines branched from the supply line to wheel cylinders, a pressure controller for allowing independent control of brake-fluid pressures within the wheel cylinders, and an ECU for controlling the pump and the pressure controller. The ECU includes an estimate part for estimating the pressures within the wheel cylinders in accordance with a flow amount of brake fluid obtained out of signals indicative of braking conditions, wherein it is estimated an amount of brake fluid flowing from the supply line to the wheel cylinder during execution of brake-fluid pressure control of the ECU and when the control is switched to pressure-increase control for the wheel cylinder having the pressure lower than that in the supply line, and wherein it is estimated the pressure within the wheel cylinder in accordance with the amount of brake fluid as estimated.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: September 20, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masamichi Imamura, Motohiro Higuma
  • Patent number: 6685279
    Abstract: A brake control system includes an ECU constructed to carry out pressure-increase assist control for restraining the opening of an OUT-side gate valve and opening inlet valves during a predetermined time when active brake control is switched from the state that it is effective for only one wheel cylinder to the state that it is effective for only another wheel cylinder.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: February 3, 2004
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventor: Kotaro Koyama
  • Patent number: 6681168
    Abstract: A traction control device for a vehicle that has at least one axle, to which two driven wheels are assigned, the traction control device, when one of the driven wheels of the axle shows a tendency to spin, regulating the kinematic behavior of the wheel tending to spin by building up a first wheel brake pressure such that the wheel tending to spin of the axle remains within a permissible slip range. In order to reduce disturbance torques caused by the first wheel brake pressure for a wheel that is not tending to spin of the axle, a second wheel brake pressure is built up, which is adjustable independently of the first wheel brake pressure. Also described is a method for controlling the slip of at least one driven wheel of an axle of a vehicle.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: January 20, 2004
    Assignee: Robert Bosch GmbH
    Inventor: Norbert Polzin
  • Publication number: 20030234577
    Abstract: A method and an apparatus 48 for allowing a vehicle 10 to be braked in both a regenerative and a distributive type or frictional manner, thereby reducing the amount of energy which is dissipated as the vehicle 10 is braked.
    Type: Application
    Filed: June 20, 2002
    Publication date: December 25, 2003
    Applicant: Ford Motor Company
    Inventor: Dale Scott Crombez
  • Patent number: 6612662
    Abstract: An anti-skid control system for an automotive vehicle includes a hydraulic modulator having electromagnetic solenoid valves for regulating a wheel-brake cylinder pressure at each of road wheels. A skid control unit prevents a wheel lock-up condition by controlling the wheel-brake cylinder pressure via on/off reaction of the solenoid valves in response to a pulse signal based on a wheel speed detected by a wheel speed sensor. The skid control unit has a data processing section that generates a desired wheel speed based on the wheel speed, calculates a desired brake-fluid pressure based on an integrated value of a wheel-speed deviation between the desired wheel speed and the wheel speed, sets a controlled ON pulse width based on the desired brake-fluid pressure, and outputting the pulse signal having the controlled pulse width to the solenoid valves after a lapse of a preset pulse width from a previous pulse signal output.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: September 2, 2003
    Assignee: Unisia Jecs Corporation
    Inventor: Nobuyuki Ohtsu
  • Patent number: 6592192
    Abstract: In a brake pressure control system for ABS control, traction control or vehicle motion control, a control unit controls each of pressure control solenoid valves in a PWM (pulse width modulation) control mode to prevent pulsation in the wheel cylinder pressure during the presence of a predetermined temperature or pressure condition, and a non-PWM control mode in the absence of the predetermined condition. The control unit includes a process section such as a computer and a PWM switch section including subsections each for a unique one of the solenoid valves. The process section has a single PWM port connected through a PWM signal line to each subsection of the PWM switch section.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: July 15, 2003
    Assignee: Unisia Jecs Corporation
    Inventors: Ichiro Kaneda, Kouji Kanauchi
  • Patent number: 6582034
    Abstract: A vehicular brake control method and apparatus having a controller that controls a pressure of a supplied operating fluid to the wheels. The vehicle brake control apparatus includes brakes that apply braking forces corresponding to the pressure of the operating fluid to the wheels. A pump is provided that force-feeds the operating fluid. A valve is disposed to adjust the pressure of the operating fluid that is force-fed from the pump. The controller performs an operation control of the pump and the valve to control the pressure of the operating fluid to be supplied to the brakes when the controller determines that the braking forces are to be applied to the vehicle. The controller controls a pressure-increasing gradient of a fluid pressure by controlling both the pump and the valve during a pressure-increasing control for increasing the pressure in the brakes.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: June 24, 2003
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kouichi Hara, Shoji Inagaki
  • Patent number: 6511137
    Abstract: A method and apparatus for calculating the actuation control of a hydraulic sub-system of a braking system in order to reduce noises associated with the hydraulics is presented. Input signals and measured/determined characteristics are utilized to calculate a value of a drive time for an inlet valve, a value of a pulse width modulator output, a duration of a current signal reduction time and a pulse width modulator value associated with the current signal reduction time, all of which determine actuation control of the hydraulic sub-system.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: January 28, 2003
    Assignee: Robert Bosch GmbH
    Inventor: Manfred Gerdes
  • Publication number: 20020135229
    Abstract: An anti-skid control system for an automotive vehicle includes a hydraulic modulator having electromagnetic solenoid valves for regulating a wheel-brake cylinder pressure at each of road wheels. A skid control unit prevents a wheel lock-up condition by controlling the wheel-brake cylinder pressure via on/off reaction of the solenoid valves in response to a pulse signal based on a wheel speed detected by a wheel speed sensor. The skid control unit has a data processing section that generates a desired wheel speed based on the wheel speed, calculates a desired brake-fluid pressure based on an integrated value of a wheel-speed deviation between the desired wheel speed and the wheel speed, sets a controlled ON pulse width based on the desired brake-fluid pressure, and outputting the pulse signal having the controlled pulse width to the solenoid valves after a lapse of a preset pulse width from a previous pulse signal output.
    Type: Application
    Filed: March 20, 2002
    Publication date: September 26, 2002
    Applicant: UNISIA JECS CORPORATION
    Inventor: Nobuyuki Ohtsu
  • Patent number: 6409286
    Abstract: The present invention relates to a method of improving the control , behavior of an electronically regulated and/or controlled driving stability control system, wherein input quantities for the control are derived from the rotational behavior of the wheels and wherein in situations which are critical for driving stability, the driving stability is increased by braking pressure introduction and/or braking pressure modulation. In order to obviate the need for a precharging pump, the present invention proposes that criteria for evaluation of the driving situation and for the early detection of a driving situation inhering an increased risk are derived from the rotational behavior of the wheels, and that the commencement of driving stability control is prepared upon detection of a driving situation inhering an increased risk. A brake system for implementing the method is also an object of the present invention.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: June 25, 2002
    Assignee: Continential Teves AG & Co. OHG
    Inventor: Helmut Fennel
  • Patent number: 6382740
    Abstract: The invention relates to a circuit arrangement of a circuit of an electrically controlled brake force booster, including a first and a second line that supply two potentials to the connections of the actuator, an electronically actuated first switch provided in the first line, a control device that switches the first switch with a first, preferably pulse-width modulated, control signal, and an electronically actuated second switch provided in the second line, wherein the control circuit switches the second switch with a second control signal. A process for testing this circuit arrangement includes the step of testing at least one potential on at least one connection of the actuator when both switches are open.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: May 7, 2002
    Assignee: Continental Teves AG & Co., oHG
    Inventors: Thomas Peichl, Gerhard Möheken, Artur Schönbein
  • Patent number: 6371573
    Abstract: A braking system for a wheeled vehicle includes a pressurized air source (63), an air actuated wheel braking device (51, 59), an operator control (49, 61) for commanding the supply of air to the braking device, an electronic control (19) which responds to vehicle speed and wheel speed to selectively invoking an antilock mode of braking. A control valve (37, 55) responds to the electronic control (19) and the operator control (49, 61) to selectively control the supply of air from the source to the braking device. In the antilock mode, the control valve is initially enabled to release braking pressure and thereafter alternately enabled and disabled to maintain braking pressure at a substantially constant reduced pressure, and subsequently alternately enabled and disabled at a reduced ratio of enabled duration to disabled duration to rebuild braking pressure.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 16, 2002
    Assignee: Robert Bosch Corporation
    Inventors: Hermann J. Goebels, Richard Erich Beyer
  • Patent number: 6357837
    Abstract: The invention relates to an electronically controllable brake booster with a vacuum chamber and a pressure chamber, which are separated from each other by a movable wall, a control valve arrangement which can be actuated by means of an electromagnetic actuation means, and by means of which a pressure difference between the pressure chamber and the vacuum chamber can be adjusted, with the control valve arrangement, as a function of a current flowing through the electromagnetic actuation means, assuming a holding position in which the current ranges between a higher value and a lower value without the control valve arrangement leaving the holding position, a first pressure changing position in which the current is higher than the higher value, and a second pressure changing position in which the current is lower than the low value, characterized in that upon a changeover of the control valve arrangement from the holding position into the first or the second pressure changing position, or upon a changeover from
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: March 19, 2002
    Assignee: Lucas Industries public limited company
    Inventors: Christoph Linden, Gregor Godlewsky, Lorenz Maack
  • Patent number: 6299262
    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: June 8, 2000
    Date of Patent: October 9, 2001
    Assignee: Hydro-Aire, Inc.
    Inventors: Bijan Salamat, Robert D. Cook