Abstract: A brake force control apparatus performs both a brake assist control and an antilock brake control without interference therebetween. A master cylinder generates a brake fluid pressure corresponding to a magnitude of a brake operation. A pump has an inlet port and an outlet port, the inlet port being communicable with the master cylinder. An inlet control valve controls communication between the master cylinder and the inlet port of the pump. A wheel cylinder is communicable with each of the master cylinder and the outlet port of the pump. A supplementary reservoir is communicable with each of the wheel cylinder and the inlet port of the pump. The brake assist control is performed, when the emergency brake operation is performed by the driver, by opening the inlet control valve and actuating the pump.

Abstract: An automotive brake control system with a skid control hydraulic unit and a pressure apply pump-and-piston device, comprises a single motor having a driving connection both an ABS return pump and a pressure apply pump, a circulation circuit being connected between a pressure introduction chamber of a pressure apply piston unit and a pressure apply suction circuit of the pressure apply pump, and a circulation mode-select valve disposed in the circulation circuit for opening and closing of the latter. The circulation mode-select valve comprises a normally-open valve. An electronic control unit is provided for closing the circulation mode-select valve only during the traction-and-yaw control in which a pressure apply action of the pressure apply piston unit is required.

Abstract: The present invention aims to provide a fluid pressure control apparatus which allows the gradient of pressure increase to be adjusted finely without using any accumulator. The fluid pressure control apparatus of the present invention includes a hydraulic pump driven by a drive motor and a wheel brake. A first orifice is provided in a passage portion on the side of an outlet of the hydraulic pump. Another passage portion on the side of an inlet of the hydraulic pump is connected to the passage portion between the first orifice and the hydraulic pump through a return passage. A switching valve and a second orifice are connected in series along the return passage. The pressure increase gradient can be set to a small value by changing the amount of fluid flowing into the wheel brake. This is effected, for example, by changing the ratio of the fluid passage area of the first orifice to that of the second orifice, the operational speed of the hydraulic pump, or the duty ratio of the switching valve.

Abstract: A brake fluid pressure control system includes an external source of fluid pressure, a wheel cylinder, and a fluid pressure control valve disposed between the external source of fluid pressure and the wheel cylinder. A controller is operable to control the fluid pressure control valve whereby fluid pressure under control is fed from the external source of fluid pressure to the wheel cylinder. When a change in pressure within the wheel cylinder occurs, a fail safe valve is operable to disconnect the wheel cylinder from the fluid pressure control valve and instead, connect the wheel cylinder to a master cylinder. Inspection of the fail safe valve is carried out by disconnecting the wheel cylinder from the control valve when no brake is applied, feeding fluid pressure from the external source of fluid pressure to the wheel cylinder, and detecting a change in pressure within the wheel cylinder. An alert device is provided to give a warning in the event of a system failure.

Abstract: A pump device includes main and auxiliary eccentric portions integrated with a motor output shaft on the side of its base end and on the side of its pointed end. The main eccentric portion is larger in diameter than the auxiliary eccentric portion. A needle roller bearing and a ball bearing are fitted to the outer peripheries of the eccentric portions. Main and auxiliary pumps include a pair of plungers which abut on the outer peripheries of the bearings, respectively, and are driven by the main and auxiliary eccentric portions.

Abstract: A connector is disclosed for providing power to a pump from a circuit in an ABS braking unit. The electrical connector includes a generally cylindrical housing having first and second ends and a length corresponding to the perpendicular distance between the circuit and the pump. In one embodiment, the first end includes a plurality of pins resiliently mounted therein and electronically connected to the second end. The pins are adapted to resiliently engage a corresponding plurality of pads mounted on the circuit for transmitting power to the second end. In a second embodiment, the second end of the connector also includes a plurality of pins resiliently mounted therein and adapted to engage a corresponding plurality of pads mounted on the pump for receiving power transmitted from the first end.

Abstract: A hydraulic pressure control apparatus for a brake including a brake cylinder activated by a pressurized fluid for braking a wheel of a vehicle, a reservoir for storing the fluid discharged from the brake cylinder, and a pump for pumping up the fluid from the reservoir, the apparatus including a pressure control device which discharges the fluid from the brake cylinder, into the reservoir, to reduce a pressure of the fluid in the brake cylinder, and supplies the fluid pumped up from the reservoir, to the brake cylinder, to increase the pressure of the fluid in the brake cylinder, a reservoir fluid amount estimating device for estimating a cumulative amount of flow of the fluid from the brake cylinder into the reservoir and a cumulative amount of flow of the fluid out of the reservoir, and estimating an amount of the fluid stored in the reservoir on the basis of the estimated cumulative amount of flow of the fluid into the reservoir and the estimated cumulative amount of flow of the fluid out of the reservoir;

Abstract: Two methods of calibrating Fax machines are disclosed. The first method utilizes a pre-printed calibration chart and a computer connected to the Fax machine to be calibrated. The calibration chart is fed into the Fax machine which sends the resultant data to the computer. This data is analyzed by the computer to determine when the Fax machine started to scan the calibration chart. If the scan process did not occur at an optimum point, the computer sends a correction value back to the Fax machine to cause the Fax machine to begin scanning subsequent documents at an optimum point. In the second method, a calibration chart is printed by the Fax machine and then fed back into the machine. A copy of the scanned calibration chart is made to determine at what point the Fax machine began scanning the chart. If the Fax machine did not begin scanning at an optimum point, a user reads the copy and manually enters a corrective offset in to the Fax machine such that subsequent documents are scanned properly.

Abstract: The present invention is directed to a hydraulic pressure control system for controlling a hydraulic pressure in each wheel brake cylinder operatively mounted on each wheel of a vehicle, which includes a modulator disposed between a master cylinder and the wheel brake cylinder for introducing thereto and draining therefrom the brake fluid. First and second pump devices are provided for introducing the brake fluid and pressurizing it to discharge the pressurized brake fluid to the wheel brake cylinder through the modulator, respectively. The second pump device has a different suction phase from the suction phase of the first pump device.

Abstract: A secondary source of braking for large hydraulically braked vehicles utilizing the available power source (38) provided by typically available anti-skid and traction control braking systems. The invention improves the time response of a secondary braking traction control system by utilizing stored fluid in the low pressure anti-skid braking system accumulators (34) to provide for faster build of pressure by the pump motor (38). Fluid is stored and utilized based on vehicle behavior and operational states and is based upon the principal the traction control, anti-skid braking and secondary braking requirements are generally mutually exclusive. This allows for a decreased response time of the secondary braking system and also provides for improved initial cycle response of typical traction control events that utilize the system configuration.

Abstract: The invention relates to an electronically controllable braking system for motor vehicles with a brake pressure generator unit (2) which can be actuated by a brake pedal (1), which supplies hydraulic fluid via a hydraulic fluid path (3) to at least one wheel brake (4) of the motor vehicle, a first electromagnetic valve arrangement (5a, 5b) which is arranged in the hydraulic fluid path between the brake pressure generator unit (2) and the wheel brake (4) for controlling the pressure build-up, pressure relief and pressure holding phases in the wheel brake, a motor-powered controllable hydraulic pressure source (7) which, in addition to or in lieu of the brake pressure generator unit (2), supplies hydraulic fluid to the wheel brake (4), and a motor-powered controllable auxiliary energy source (15, 30) which boosts an actuation of the brake pressure generator unit (2) by the brake pedal (1) or which effects an actuation of the brake pressure generator unit (2) in lieu of the brake pedal (1), with the controllable

Abstract: A brake system for automotive vehicles has a pneumatic brake power booster with two chambers one of the chambers being adapted to be acted upon by a low pressure and the other one by a higher pressure, and at least one of the chambers being adapted to be connected to a pneumatic pump. A device is provided to activate and deactivate the pump in response to the pressure that prevails in the chamber of the brake power booster associated with the pump.

Abstract: A booster and a pressure amplifying device are provided as devices performing a brake assist. Further a pressure sensor which detects master-cylinder pressure is provided. While the braking is applied to the vehicle, the malfunction of the booster can be detected based on master-cylinder pressure detected by the pressure sensor. If the malfunction of the booster is detected, a pump in the pressure amplifying device is driven as an substitute for the booster. As a result, a required brake assist can be performed to ensure high braking force. Accordingly, the brake control apparatus can enhance safety during vehicle operation.

Abstract: A plurality of electrical fluid pressure control valves or a plurality of groups each comprised of a plurality of electrical fluid pressure control valves are operatively associated with respective power supply replays. The electrical fluid pressure control valves and a plurality of electrical switch valves are connected in parallel to a power source. A plurality of failure sensors are associated with the respective electrical fluid pressure control valves or the respective groups so as to detect whether an electrical system failure in any one of the electrical fluid pressure control valves or the groups occurs. If occurs, failure control unit is operable to control a corresponding one of the power supply relays so as to cause a corresponding one of the electrical switch valves to selectively connect a corresponding one of the wheel cylinders to a master cylinder.

Abstract: A fluid pressure source apparatus has a pump, an accumulator, a pressure switch, and a control device for turning on and off the pump in accordance with the signal from the pressure switch. The control device has a pressure increase control unit. When the pressure detection signal of the pressure switch indicates a high pressure, the pressure increase control unit estimates a pressure reduction N resulting from a fluid pressure consumption by a fluid pressure circuit. If the estimated amount of pressure reduction N exceeds a set value KN=KN1, KN2, the pressure increase control unit drives the pump for a set time KT=KT1, KT2, thereby ensuring a predetermined range of accumulator pressure despite a possible failure of the pressure switch or sensor.

Abstract: A brake system control apparatus comprising: a fluid brake system including a master cylinder containing a hydraulic fluid having a hydraulic pressure, a hydraulic pump having an output hydraulically coupled to the master cylinder, a motor coupled to and providing motive force to the hydraulic pump, a current sensing device coupled to the motor and providing an output signal indicative of electric current through the motor; and an electronic controller coupled to the current sensing device comprising a first sampler taking a first sample of the output signal a first time period after a start up of the motor, a second sampler taking a second sample of the output current a second time period after start up of the motor and a divider for determining a ratio of the first and second samples wherein the ratio is indicative of a hydraulic pressure in the master cylinder at the start up of the motor.

Abstract: The invention is based on the objective of simplifying the filling of a auxiliary reservoir that provides an additional medium pressure volume for the suction side of a return pump. For this purpose, the invention proposes to utilize a separating piston that is charged on one side by the main cylinder pressure and on the other side by a compression spring. The pressure medium is conveyed from the main reservoir to the auxiliary reservoir by means of two return valves while the separating piston is displaced. Due to the stepped design of the separating piston, only a small volume displacement is required on the side of the main cylinder for supplying a large charge volume to the auxiliary reservoir.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston for defining the pressure chamber behind the control piston. The control piston is moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure. A valve assembly is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston, and adapted to supply the regulated pressure into the power chamber to assist the operation of a brake pedal.

Abstract: A work brake apparatus for a wheel type excavator having a travelling device, a suspension device, and a service brake device. The work brake apparatus comprises: a first means, which is connected to the forward/backward lever of the travelling device, for unlocking the suspension device as the suspension locking solenoid valve switches over in response to a predetermined signal when the forward/backward lever switches over to its forward or backward position, and a second means, which is connected to the forward/backward lever of the travelling device, for keeping the service brake applied as the service brake valve switches over in response to a predetermined pilot pressure when the forward/backward lever switches over to its neutral position.

Abstract: When a driver wants to stop a vehicle quickly, the driver depresses a braking pedal strongly. A stop switch is turned on. The deceleration of the vehicle exceeds a predetermined value. In this case, an electronic control unit ECU actuates a pump to send brake fluid from a master cylinder to a wheel cylinder. Thus, the hydraulic braking pressure applied to the wheel cylinder is increased to a level higher than that obtained by a driver's braking pedal depression. Accordingly, the braking force increases at a speed exceeding a driver's foot braking operation without any further burden on the driver. The braking performance can be improved with a prompt increase of the braking force in response to a strong braking operation. Furthermore, utilizing an increased braking force makes it possible to eliminate an imbalance between wheel braking behaviors.

Abstract: An anti-lock brake control system for an automotive vehicle, comprises a wheel-brake cylinder adapted to provide a braking action, a hydraulic pressure actuating unit adapted to be fluidly connected to the wheel-brake cylinder to feed and exhaust brake fluid to and from the wheel-brake cylinder, and having at least one reservoir tank provided for temporarily storing brake fluid exhausted from the wheel-brake cylinder via a return line and a return pump driven by an electric motor and provided for exhausting the brake fluid within the reservoir tank toward a main brake-fluid line, sensors provided for detecting wheel speeds, a controller for executing a skid control of the hydraulic pressure actuating unit in response to signals from the sensors, a diagnostic system for making a diagnosis on a trouble of said electric motor, and a monitoring device for monitoring an amount of brake fluid stored in said reservoir tank when said diagnostic system determines that said electric motor is in trouble.

Abstract: A hydraulic brake system is provided which does not need a mechanism to feed back the wheel cylinder pressure. The hydraulic brake system generates a brake force by supplying the brake fluid to a wheel cylinder under a high pressure generated by a high pressure source. The brake fluid is supplied to the high pressure source from a reservoir tank storing the brake fluid under atmospheric pressure. A fluid passage connects the high pressure source to both the wheel cylinder and the reservoir tank. An amount of the brake fluid flowing from the high pressure source to the wheel cylinder is controlled by a constant flow valve.

Abstract: A kinetic characteristic control system performs a modifying process for modifying a standby control constant so as to, for example, decrease the standby start opening in correspondence with a calculated braking system control decrease amount x (step 230), a shift pattern characteristic modifying process for modifying a shift position change line so as to make a shift-up thereof easy (step 250), an EFI control amount modifying process for modifying a fuel injection amount, an air-fuel ratio, and an ignition timing (step 270), and a modifying process for a driving system TRC control performance (step 290). These modifying processes are intended for modifying the control constant, control amount, etc. so that the driving torque may decrease to thereby prevent the occurrence of excessive slippage of the drive wheels.

Abstract: A braking system including two brake cylinders, a pump adapted to pressurize a fluid received from a reservoir and distribute the pressurized fluid to the two brake cylinders, a solenoid-operated pressure control device disposed between the reservoir and pump and the two brake cylinders, and a controller for controlling the pressure control device for regulating the pressures in the two brake cylinder. The pump includes a piston in a cylinder bore formed so as to partially define a pump chamber that communicates (i) with the reservoir through a suction port and (ii) with the two brake cylinders through respective two delivery reports. The piston reciprocates to change the volume of the pump chamber, which in turn alternatively repeats between a suction and a delivery stroke. The pump includes a device for disconnecting the two delivery ports from each other in at least a portion of the delivery stroke of the piston.

Abstract: In a brake system with a controllable hydraulic pump in a hydraulic circuit, and with at least one solenoid valve, the operating state of the valve is changed in response to a control signal. As a result of the change in the operating state of the solenoid valve, the flow resistance in the hydraulic circuit is changed. Monitoring structure is provided which, in the presence of certain operating conditions, monitor the run-down behavior of the hydraulic pump in different operating states of the solenoid valve and actuate a display device to display a malfunction of the brake system when a malfunction is detected. Additionally, or alternatively, the automatic brake control can be turned off in reaction to the detection of a malfunction. It is possible for the control unit and the hydraulic unit to be replaced separately and for the installation to be tested for proper functioning.

Abstract: A hydraulic brake system for braking a vehicle wheel includes a hydraulic fluid source, a pump connected to the hydraulic fluid source for pumping hydraulic fluid based on operation of an operating member of the vehicle and a connecting arrangement having one end connected to the pump. A wheel cylinder which is adapted to be mounted adjacent a brake disk of a vehicle wheel includes a brake pad element for being urged against the brake disk upon the application of a hydraulic fluid pressure to impart a braking force to the brake disk. The brake pad element is movable with the brake disk when the brake disk element is urged against the brake disk. In addition, a movable pressure increasing element is positioned adjacent the brake pad element and is movable away from the brake pad element as a result of the brake pad element moving with the brake disk.

Abstract: An antilock/traction control/vehicle stability braking system hydraulic circuit using a fluid flow intensifier to provide a rapid application of fluid pressure to brakes during a TC/vehicle stability control operation at a flow rate that is greater than is normally available from an ABS pump alone. The intensifier increases the fluid flow as a function of using a stepped piston operating within respective input and output chambers having different effective diameters. The intensifier also includes an intermediate chamber into which fluid dumped from a brake cylinder is drawn rather than being lost to a master cylinder reservoir. The fluid thus remains in the hydraulic circuit, ensuring that a desired ratio of pedal travel versus pressure is maintained after a transition from TC/vehicle stability braking to ABS-base braking.

Abstract: The invention is directed to a pressure accumulating control system for use in a pressure supply apparatus which has a fluid pump, an electric motor for driving the fluid pump to supply a hydraulic pressure, and an accumulator for accumulating the hydraulic pressure supplied from the fluid pump. The system includes a pressure detection device for detecting the hydraulic pressure accumulated in the accumulator, and a continuous control device for feeding a current to the motor continuously. The continuous control device is adapted to feed the current to the motor continuously, when the pressure detected by the pressure detection device becomes less than a predetermined lower limit, and is adapted to terminate the continuous feeding of the current to the motor, when the pressure detected by the pressure detection device exceeds a predetermined upper limit. The system further includes an intermittent control device for feeding a current to the motor intermittently by a predetermined cycle of time.

Abstract: In a road vehicle electrohydraulic brake system, each wheel brake is assigned a brake-pressure regulating element which can be controlled by an electric motor. At least one electronic retardation desired-value signal transmitter is actuated by the driver. An electronic control unit produces the required actuating signals for the brake-pressure regulating elements from a comparison of the desired-value input signals with actual-value signals characteristic of the vehicle retardation. The brake-pressure regulating elements each comprises a piston pump. The filling and delivery strokes of these elements are performed in a fixed phase relationship with a pump driving element. The output of the pump per pump cycle is regulated opposite the pressure and, in all cases, is small relative to the output, Q.sub.max, required for coupling the maximum value of the brake pressure P.sub.Bmax into the connected wheel brake.

Abstract: A back-up power assisted braking system substitutes an intermittently actuated secondary source of pressurized hydraulic fluid such as a traction control/anti-lock pump and motor (41) for the normal braking power assist upon the detection of a failure in the primary power assisted braking system. A failure may be detected in responsive to sensing simultaneous brake pedal (23) displacement and a lack of fluid flow for providing an abnormality signal. Also, a failure may be detected by sensing a predetermined difference between the commanded braking force (45) and the actual braking forces (38, 49). There is a pressure transducer (45) which provides an indication of brake pedal commanded braking force and a hydraulic circuit (43, 53 or 55, 51) interconnecting the secondary source outlet, the individual wheel brake actuators (14) and secondary source inlet.

Abstract: Method and circuit configuration for controlling the flow rate of an electromotively driven hydraulic pump which is activated by a variable pulse/pulse-break train for controlling the auxiliary pressure supply of a brake system including anti-lock control (ABS) and traction slip control by brake management (BASR). The generator voltage produced by the pump motor during times of pulse break is evaluated as a standard of the rotational speed of the pump. The nominal value of the pump speed is compared with the actual value of the pump speed in a control circuit, and the new correcting variable for the pump activation is derived from the difference.

Abstract: A proportional fluid pressure regulation system is provided using a combination of a proportional valve and a shuttle valve for fluid flow control. A system of fluid pressure regulation is achieved where the desired pressure output is provided by one of two pressure input sources. The two pressure input sources are alternately selected by operation of a pilot operated shuttle valve and a solenoid operated proportional valve. The two pressure sources may comprise a manually actuated vehicle braking system's master cylinder and a power operated fluid pump.

Abstract: A vehicle brake cylinder pressure control apparatus wherein an amount of fluid flow into a reservoir is estimated based on vehicle deceleration and a pressure reducing time of the brake cylinder, while an amount of fluid flow from the reservoir is estimated based on a pumping time during which the fluid is pumped up from the reservoir by a pump, and the vehicle deceleration or an operating speed of a pump motor, so that an amount of the fluid stored in the reservoir is estimated on the basis of the amounts of the flow flows into and from the reservoir. Various parameters may be used in place of the vehicle deceleration, pumping time and motor operating speed, for estimating the amounts of the fluid flow into and from the reservoir and the reservoir fluid amount.

Abstract: An integral power booster and master cylinder assembly interactively operates with a braking system to effect conventional braking operation, anti-lock brake operation, traction control operation and stability enhancement system functions in a cost effective manner. The incorporation of a low pressure hydraulic booster provides a manner of enhancing first cycle response times of the traction control and stability enhancement system functions. Fluid separation is maintained between the stability enhancement system and the braking channels through the use of a pump priming accumulator to provide a pre-charge to the wheel brake pressure effecting pump assembly, in direct response to the power booster.

Abstract: In a power-brake system, a hydraulic pressure generated by means of a pump may be supplied, controllably in proportion to an actuation force via brake conduits, by a power-brake valve to individual brake cylinders. Control pressure conduits are connected to the brake cylinders or the brake conduits in the vicinity of the brake cylinders and these control pressure conduits are connected to the brake valve. The brake pressure at the brake cylinders may be fed back, via the control pressure conduits, as the control pressure for acting on the control end of the brake valve so that a control of the control plungers of the brake valve is carried out corresponding to the brake pressure build-up at the brake cylinders and, particularly when low brake pressures are desired, rapid pressure build-up times in the brake conduits are ensured.

Abstract: Self-suction pumps are driven to take in brake fluid from a master-cylinder side before performing brake TRC control when at a low temperature and moreover when a vehicle is stopped. During driving of these self-suction pumps, pressure-increasing control valves and pressure-reducing control valves are both opened and brake fluid is accumulated in reservoirs. Because of this, an amount of pump discharge employed in brake TRC control when at a low temperature is assured, and responsiveness of brake TRC control is enhanced.

Abstract: In a hydraulic apparatus providing a base with a discharge passage coupler to a circumferential portion of an annular discharge passage and to a damper chamber, a hydraulic device is connected via an orifice to the discharge passage without arranging the annular discharge passage between the damper chamber and the orifices, so that the damper chamber and the orifices cooperate together to exert an effective attenuating action thereon so as to suppress the transfer of pressure pulsation thereto effectively.

Abstract: Apparatus for automatically compensating or adjusting for the slack or added travel as frictional material on brake pads wears during repetitive brake applications. A stack of snap rings each having a gap in its periphery is collapsed or compressed and assembled onto the inside diameter of a wall of a hydraulic pressure applied cylinder portion. The wall inside diameter has a shoulder with a first diameter that holds the snap rings in their compressed condition. Contiguous to that section is a second wall section having a diameter larger than the first section such that as the cylinder is extended further during a braking action because of wearing of the brake pads, one of the snap rings is forced into the larger diameter area thus expanding it and preventing the wall portion of the cylinder from returning to its original position, thus maintaining the gap constant.

Abstract: A hydraulic system controls a brake system and a suspension system of a wheel-type excavator. The system has a switching section for electrically controlling various systems such as a brake system and a suspension system of the excavator. The system performs various brake functions according to the switching of the switching section. By the system, convenience is provided in handling the switch or operating the systems, and breakage of components which can be happened due to the mis-operation is prevented.

Abstract: A brake force control device for a vehicle includes a master cylinder generating a brake pressure by operation of an operating member of the vehicle, a wheel brake for being mounted on a vehicle wheel and connected to the master cylinder through a conduit, a pressure control chamber connected to the wheel brake, a displacement actuator which varies the capacity of the pressure control chamber and an electric controller for operating the displacement actuator so as to supply the brake pressure to the wheel brake when the master cylinder does not generate the brake pressure.

Abstract: In a brake system with an automatic braking mechanism of the present invention, a master cylinder pressure developed by pedaling a brake pedal 1 is supplied to wheel cylinders through first and second brake paths 6,7, first and second center valves 26', 26 and first and second outlets 24', 24 of an automatic broke actuator 8 so that the normal brake is actuated. An electronic control unit (ECU) 40 actuates a thrust generator 38 and thus an automatic braking signal pressure is developed, whereby first and second small-diameter pistons 18', 18 and first and second large-diameter pistons 16', 16 are moved forward to close the first and second center valves 26', 26 to develop pressures which are supplied to the Wheel cylinders, with the result that the automatic brake is actuated.

Abstract: A hydraulic brake system for braking a vehicle wheel includes a hydraulic fluid source, a pump connected to the hydraulic fluid source for pumping hydraulic fluid based on operation of an operating member of the vehicle and a connecting arrangement having one end connected to the pump. A wheel cylinder which is adapted to be mounted adjacent a brake disk of a vehicle wheel includes a brake pad element for being urged against the brake disk upon the application of a hydraulic fluid pressure to impart a braking force to the brake disk. The brake pad element is movable with the brake disk when the brake disk element is urged against the brake disk. In addition, a movable pressure increasing element is positioned adjacent the brake pad element and is movable away from the brake pad element as a result of the brake pad element moving with the brake disk. As a result, an increase in pressure in the wheel cylinder arises in a relatively rapid manner to compensate for compliant characteristics in the braking system.

Abstract: Electrohydraulic braking applied to a plurality of automotive vehicle braking channels operates to drive brake pressure modulator position toward a position corresponding to a braking input and corrected for channel to channel braking variations and vehicle deceleration error. A function for adapting the braking input to a position command is provided for each channel and is periodically adapted in accord with a difference between the channel's brake pressure modulator position error and a desired position error.

Abstract: A vehicle braking system including, a pump operated by a pump actuator driven by a DC power source, an electrically operated pressure control device having operating states which are selectively established to electrically control the fluid pressure in wheel brake cylinder and which includes a pressure-increase state for fluid communication of the wheel brake cylinder with at least one of a master cylinder and pump and a pressure-decrease state for fluid communication of the wheel brake cylinder with a reservoir, and a pump actuator control device having a power supply portion for intermittently supplying electric power from the DC power source to the pump actuator such that the duty ratio of the pump actuator is controlled in response to a duty ratio signal, and a signal generating portion for generating the duty ratio signal.

Abstract: A vehicular brake booster using fluid pressurized by a hydraulic power steering system hydraulic pump. Fluid pressure is controlled by using a pressure regulator in the pump output and by electronically switching fixed orifices in a boost developing valve controlling fluid flow within the power steering system. Additional control is effected by electronically opening and closing apply and relief valves controlling fluid flow respectively to and from a brake power booster for differing periods.

Abstract: An anti-lock braking system for a road vehicle having a plurality of hydraulically operated brake actuators, a plurality of control channels controlling the supply of hydraulic fluid to the brake actuators, an electrical supply and a hydraulic pump for supplying hydraulic fluid to the brake actuation circuit. The pump is driven by an electric motor energized by the power supply. The magnitude of the operating voltage at the pump motor is compared with a predetermined reference voltage. The physical demand upon the pump motor is reduced by inhibiting the control channels if the measured magnitude of the electric motor voltage is less than the reference value.

Abstract: The present invention is directed to a hydraulic braking system having a hydraulic braking pressure circuit for braking each wheel of an automotive vehicle with brake fluid fed to a wheel cylinder operatively mounted on the wheel. The system includes an auxiliary pressure source which has an inlet for introducing the brake fluid and an outlet connected to the pressure circuit for discharging thereinto the pressurized brake fluid. A circulation passage is disposed between the outlet and the inlet for communicating with each other. An auxiliary valve is disposed in the circulation passage so as to open or close the passage. An auxiliary reservoir is connected to the circulation passage between the valve and the inlet of the source. The auxiliary reservoir has a capacity for storing a predetermined amount of brake fluid. And, a controller is provided for driving the source and actuating the valve so as to open or close the circulation passage.

Abstract: A hydraulic control unit for a vehicle anti-lock brake system is disclosed which comprises a bore defining a chamber symmetrical about an axis and having a sidewall and a bottom wall. A fluid inlet passage is open to the bore from one of the walls and a damping orifice of substantially restricted diameter relative to the inlet passage is in open communication with the inlet passage. An attenuator is seated within the chamber and is sealed relative to the chamber to preclude the flow of brake fluid from the control unit. The attenuator includes a compressibly deformable solid core member that substantially fills the chamber.

Abstract: The hydraulic brake system for a vehicle which can perform anti-lock control includes a brake circuit for connecting a master cylinder to wheel brakes, a control valve circuit for decreasing hydraulic brake pressure in the wheel brake by discharging brake fluid from the wheel brake to a reservoir, a plunger pump driven by an electric motor for returning brake fluid from the reservoir to the brake circuit and a slit formed on at least the discharge valve seat or the suction valve seat of the pump unit for evacuating the pump chamber of the plunger pump. The hydraulic brake system can further include a one-way valve which permits communication between the pressure chamber of the pump with the reservoir for evacuation.

Abstract: A brake control unit to be used in an anti-lock control or the like which can be mounted in a small space. The brake control unit comprising a pump housing block having an accumulator and a pump installed therein, a first and a second solenoid valves of which one ends are connected to one surface of the pump housing block and vertically installed, and a motor M vertically connected to one surface of the pump housing block in parallel with the first and second solenoid valves.