Abstract: A braking device including a travel sensor, which consists of a movable travel indicator and a sensing device for detecting a displacement or position in an actuation direction, wherein the braking device is structurally combined as a compact unit including a housed electronic control unit, a hydraulic unit, and in particular a pump unit, wherein the sensing device is integrated on or in the housed electronic control unit and the sensing device is arranged directly or indirectly on a circuit board, wherein the circuit board is either a main circuit board of the electrohydraulic device or an additional auxiliary circuit board connected to the main circuit board electrically and in particular also mechanically.

Abstract: Disclosed herein is an electronic stability control system including: a motor driver configured to include a motor switch for driving a motor unit depending on a PWM signal and a freewheeling switch and a reverse protection switch for checking whether the motor unit is normally operated; and a controller configured to turn off all of the motor switch, the freewheeling switch, and the reverse protection switch, turn off only the motor switch and the reverse protection switch, or turn off only the motor switch and the freewheeling switch, apply a diagnostic current, and then detect a fault state of the freewheeling switch or the reverse protection switch, or the freewheeling switch and the reverse protection switch by using a voltage detector.

Abstract: The invention relates to a control device for an electrically-driven vacuum pump. The control device stops operation of an electrically-driven vacuum pump for generating negative pressure in a negative pressure chamber of a brake booster when the vacuum pump is operated and a gradient of increasing of a booster negative pressure representing a magnitude of a difference between pressure in the negative pressure chamber and the atmospheric pressure is smaller than or equal to a predetermined stop gradient threshold.

Abstract: A hydraulic brake system includes: a master cylinder including a pressurizing piston; a brake cylinder for a hydraulic brake operable by a hydraulic pressure in a front pressure chamber defined in front of the pressurizing piston; and a rear-hydraulic pressure controller connected to a rear chamber defined at a rear of the pressurizing piston. The rear-hydraulic pressure controller controls a hydraulic pressure in the rear chamber and includes: a regulator, operable by at least one of the hydraulic pressure in the front pressure chamber and a control pressure controlled electrically, for supplying an output hydraulic pressure to the rear chamber; and a master-pressure-operating-state detector configured to, when the output hydraulic pressure is greater than a threshold value, detect that the regulator is in a master-pressure operating state in which the regulator is operated by at least the hydraulic pressure in the front pressure chamber.

Abstract: A brake control apparatus includes a first pressure-applying section connected through a first oil passage to a wheel cylinder; a pump; a communication valve provided on a second oil passage which connects the first oil passage with the pump; a backflow passage connecting a suction side of the pump with a portion between the pump and the communication valve; a pressure-regulating valve provided on the backflow passage; and a control unit. The control unit attains a first state that causes the first pressure-applying section to apply hydraulic pressure to the wheel cylinder, and a second state that causes the pump to apply hydraulic pressure to the wheel cylinder by driving the pump and at least one of the communication valve and the pressure-regulating valve. The control unit actuates the at least one with a delay relative to an actuation of the pump, when switching to the second state.

Abstract: Disclosed is a control method of an electro-mechanical brake, including: a first step of operating a brake to stop a vehicle and generating a target pressure value of the brake; a second step of calculating an electrical angle of a three-phase motor and preparing movement of the electrical angle when the vehicle stops; a third step of checking errors of requested current and pressure; a fourth step of setting a range of the electrical angle when the current and the pressure are normal; and a fifth step of forcibly moving an actual position of the electrical angle to an adjacent electrical angle.

Abstract: A brake hydraulic pressure control apparatus for a vehicle includes: a base member; a control housing including a storage space for storing an electromagnetic valve on one face of the base member and a coil assembly; and a pump driving motor on a back face of the base member. The base member are provided with: two housing mounting penetration holes through which housing mounting screws for fixing the control housing are to be inserted; two motor mounting holes into which motor mounting screws for fixing the motor are to be inserted; and a rotation shaft storage hole into which a rotation shaft of the motor is to be stored, wherein the housing mounting penetration holes and the motor mounting holes are respectively disposed point-symmetrically with respect to the center of the rotation shaft storage hole.

Abstract: A vehicle park-brake system includes a park brake, a solenoid; a first pressure source; a servo for disengaging the park-brake using the first pressure source, and for disengaging the park-brake using a force produced by the solenoid that actuates first and second pistons; and a second pressure source applied to the servo causing hydraulic pressure to vent from the servo, the pistons to detach mutually, and the servo to engage the park brake.

Abstract: A hydraulic antilock brake device, comprises an oil tank filled with hydraulic oil, a pump electric motor group, a one-way valve, a piloted overflow valve, a manual two-position three-way valve, an adjustable throttling valve, an adjustable throttle valve, a high pressure oil inlet tube, and an oil return tube. the high pressure oil inlet tube and the oil return tube are communicated with a hydraulic controlled negative feedback two-position four-way valve, which is communicated with a brake cylinder connected with a friction sheet. Fast valve holes are provided at two ends of an inner chamber of said hydraulic controlled negative feedback two-position four-way valve, and fast valves are located in the fast valve holes. Two ends of an inner chamber of said braking cylinder are provided with feed-back grooves communicated with the fast valve holes by oil passage. The hydraulic antilock brake device can ensure the driving safety.

Abstract: Disclosed herein is a pressure damping device for a brake system which may reduce pressure pulsations generated by a piston pump. The pressure damping device is installed at a brake system having a hydraulic block provided with a first hydraulic circuit to control transfer of fluid pressures generated at a first port of a master cylinder and discharged from a first pump, and a second hydraulic circuit to control transfer of fluid pressures generated by a second port of the master cylinder and discharged from a second pump. The hydraulic block is provided with a bore connecting the master cylinder with a discharge outlet of each of the pumps and formed between main oil channels. The pressure damping device is provided in the bore, has a changeable volume, and includes a stopper member and a damping member. The damping member includes a ring-shaped elastic member and a plate.

Abstract: A vehicle brake system and method for operating same, having a master brake cylinder, a brake medium reservoir, and a first brake circuit, connected via a reservoir line to the brake reservoir, having at least one first wheel brake cylinder, a first wheel inlet valve associated with the first brake cylinder, a first pump, by which a first brake medium volume is pumpable from the reservoir line through the open first wheel inlet valve into the first brake cylinder, a continuously adjustable first wheel outlet valve, by which a first brake medium displacement from the first cylinder into the brake reservoir is controllable, and a connecting line having a spring-loaded non-return valve, via which a delivery side of the first pump is connected to the brake reservoir, a brake medium displacement from the brake reservoir to the delivery side of the first pump being prevented by the spring-loaded non-return valve.

Abstract: A solenoid valve for fluid control of a vehicular hydraulic braking system includes an armature having a damping port. The damping port of the armature provides a turbulent fluid flow characteristic to fluid passing through the armature that creates a damping characteristic to attenuate noise and vibrational disturbances that is generally less sensitive to temperature and viscosity conditions of the fluid.

Abstract: Disclosed herein is a hydraulic braking device including: a reservoir for storing hydraulic oil; a hydraulic pressure supply unit for sucking hydraulic oil from the reservoir and supplying braking pressure to a wheel cylinder; a main flow path for supplying the braking pressure of the hydraulic pressure supply unit to the wheel cylinder; a pressurizing valve for opening/closing the main flow path; a master cylinder for generating braking pressure; a sub flow path for supplying the braking pressure of the master cylinder to the main flow path; a shutoff valve for opening/closing the sub flow path; and a controller for detecting the pressure of the main flow path in a state where both of the shutoff valve and the pressurizing valve are closed, and determining that a leak occurred in the pressurizing valve when the detected pressure is higher than a preset value.

Abstract: A vehicle brake system includes a brake pedal unit (BPU) coupled to a vehicle brake pedal and including an input piston connected to operate a pedal simulator during a normal braking mode, and coupled to actuate a pair of output pistons during a manual push through mode. The output pistons are operable to generate brake actuating pressure at first and second outputs of the BPU. A hydraulic pressure source for supplying fluid at a controlled boost pressure is included. The system further includes a hydraulic control unit (HCU) adapted to be hydraulically connected to the BPU and the hydraulic pressure source, the HCU including a slip control valve arrangement, and a switching base brake valve arrangement for switching the brake system between the normal braking mode wherein boost pressure from the pressure source is supplied to first and second vehicle brakes, and the manual push through mode wherein brake actuating pressure from the BPU is supplied to the first and second vehicle brakes.

Abstract: A master cylinder generates a master cylinder pressure in response to a stepping operation by a driver on a brake pedal. A power hydraulic pressure generation device includes a pressurizing pump and an accumulator, and a hydraulic pressure of a working fluid pressurized by the pressurizing pump is accumulated by the accumulator as an accumulator pressure. A pressure increasing mechanism communicates to the master cylinder and the accumulator, mechanically moves in response to the master cylinder pressure supplied from the master cylinder, and uses the accumulator pressure supplied from the accumulator to generate a servo pressure. A pressure increasing mechanism cut valve serving as a shut-off valve is a normally-closed electromagnetic on-off valve, and is provided on a high pressure supply passage for communication between the accumulator and the pressure increasing mechanism.

Abstract: A system and method for detecting a pre-charge pressure of a hydraulic braking system are disclosed. A controller receives pressure readings from a pressure sensor indicative of the pressure of a hydraulic brake accumulator or the lower pressure of more than one accumulator. In response to fluid being provided to the hydraulic accumulator, the controller determines a first rate of pressure change, a second rate of pressure change different than the first rate, and a transition pressure between the first and second rates. The controller determines an approximate pre-charge pressure of the hydraulic brake accumulator based on the transition pressure. A warning can be provided to the operator or another when the determined pre-charge pressure is lower than a reference pressure.

Abstract: A brake system and related components including a metering device are configured to regulate a control signal received from a brake control device such that a control valve delays the supply of a level of requested braking pressure for a prescribed amount of time. The metering device can be an inversion valve and orificed check valve in a control circuit adapted to allow relatively unrestricted flow until a threshold pressure is reached, after which pressure the inversion valve closes and the flow is metered through an orifice. This has the effect of allowing rapid brake actuation to a first level, and then slowing further application of the brake until full requested braking is achieved. An electronic control unit can also be configured to regulate a control signal to delay development of the requested brake pressure.

Abstract: A brake system and method for operating same for a vehicle having a master brake cylinder, a brake medium reservoir, a first wheel brake cylinder, into which a first brake medium volume is displaceable from the master cylinder, a second wheel brake cylinder, into which a second brake medium volume is displaceable from the master cylinder, and a pump, which is hydraulically connected to the brake medium reservoir, the first wheel brake cylinder being hydraulically connected to the pump via a first non-return valve and the second wheel brake cylinder being hydraulically connected to the pump via a second non-return valve so that the pump can pump a third brake medium volume from the brake medium reservoir through the first non-return valve into the first wheel brake cylinder and a fourth brake medium volume from the brake medium reservoir through the second non-return valve into the second wheel brake cylinder.

Abstract: A brake ECU uses a control pressure acquired from a control pressure sensor to determine whether a valve closing operation abnormality or a valve opening operation abnormality occurs in one of a pressure increasing linear control valve and an adjusted flow rate cut valve in a state where a hydraulic pressure is supplied from an accumulator. The brake ECU controls, if the brake ECU determines that an abnormality occurs, respectively the control valve and the cut valve to change to an open state or a closed state, and identifies, based on a change in the control pressure acquired from the control pressure sensor, in which of the control valve and the cut valve the valve opening operation abnormality or the valve closing operation abnormality occurs. The brake ECU can use, after a valve in which the valve opening operation abnormality or the valve closing operation abnormality occurs is identified, a valve in which the abnormality does not occur to carry out brake control.

Abstract: Provided is a brake device that can increase energy efficiency. The present invention is provided with: a master cylinder (5) that generates fluid pressure alongside the operation of a brake by a driver; and a booster device that reduces the force of operation of the brake by the driver by means of an energy source (fluid pressure unit 86)). In a predetermined brake operation region, the operation of the booster device is suppressed.

Abstract: A master cylinder 5 includes: a first liquid chamber 51 generating a liquid pressure in response to a brake operation of a driver; and a second liquid chamber 52 communicated with a reservoir 4 and connected to a suction port 70 of a pump 7. In a state in which the reservoir 4 and a suction section 70 of the pump 7 are communicated via the second liquid chamber 52, a liquid pressure of the first liquid chamber 51 can create a wheel cylinder liquid pressure.

Abstract: A brake system includes an upstream brake fluid pressure generating device automatically generating a fluid pressure in a master cylinder to control a wheel cylinder fluid pressure in a wheel cylinder provided for a wheel, a downstream brake fluid pressure generating device driving a pump and a control valve to variably control the wheel cylinder fluid pressure with a brake fluid sucked in from the master cylinder by the pump, a brake operating part provided separately from a brake pedal so as to be operated by a driver to apply braking force to the wheel, and a wheel cylinder fluid pressure cooperative control unit controlling the wheel cylinder fluid pressure by activating at least one of the upstream brake fluid pressure generating device and the downstream brake fluid pressure generating device in response to an operation of the brake operating part.

Abstract: When a driving force of a drive motor (21) becomes a maximum driving force even in the case where a brake pedal (5) is depressed by a large amount while a vehicle is in a stopped state, a second ECU (33) outputs a valve-closing command to a boost control valve (40, 40?) of an ESC (31) for a left front wheel (FL; front wheel 1L) and a right front wheel (FR; front wheel 1R). In this manner, a hydraulic pressure flowing from a master cylinder (8) through the ESC (31) to each wheel side is not supplied to wheel cylinders (3L, 3R) for the front wheels (1L, 1R) but is supplied only to wheel cylinders (4L, 4R) for rear wheels (2L, 2R). A hydraulic stiffness of the wheel cylinders (3L, 3R, 4L, 4R) is changed by stopping supply of a brake fluid to the wheel cylinders (3L, 3R).

Abstract: A brake apparatus includes: a fluid pressure control valve; a fluid pressure pump; a feedback control circuit correcting a control power corresponding to a feedback control target rotation number of a motor and feed the corrected control power to a motor; a feed forward control circuit configured to feed, to the motor, a control power corresponding to a feed-forward control target rotation number of the motor; and an abnormal control fluid pressure generation control device, if a rotation number detector is abnormal, rotating the electric motor with the rotation number higher than the feedback control target rotation number by a margin rotation number, increases the brake fluid passing through the fluid pressure control valve, and changes the control current to be supplied to the fluid pressure control valve so that the wheel cylinder fluid pressure is not changed.

Abstract: A brake system and a method for operating same for a vehicle having a first wheel brake cylinder, into which a first brake medium volume is displaceable from a master brake cylinder, a second wheel brake cylinder, into which a second brake medium volume is displaceable from the master brake cylinder, a first pump associated with the first wheel brake cylinder and a second pump associated with the second wheel brake cylinder, the brake system including a block valve coupled to the brake medium reservoir, the first pump being able to pump a third brake medium volume through the at least partially open block valve and a first non-return valve into the first wheel brake cylinder, and the second pump being able to pump a fourth brake medium volume through an at least partially open block valve and the second non-return valve into the second wheel brake cylinder.

Abstract: A hydraulic brake system for a vehicle in which a pressure of a working fluid supplied from a high-pressure-source device having a pump is adjusted by an electromagnetic pressure-increase linear valve and an electromagnetic pressure-decrease linear valve, and a brake device provided for a wheel generates a braking force whose magnitude depends on the pressure adjusted by the linear valves, the hydraulic brake system being configured to cope with fluid leakage in the pressure-increase linear valve that is beyond a set degree.

Abstract: The invention relates to an electrohydraulic pressure control device for vehicle brake systems, including at least one electronic control unit, at least one hydraulic unit and at least one electric motor for driving a hydraulic pump, wherein the electronic control unit is mechanically connected to the hydraulic unit and is sealed off from the outer environment in at least one connection zone to the hydraulic unit by a circumferential, in particular elastic sealing material, and the sealing material extends along an edge of the substantially cuboid-shaped hydraulic unit, wherein the edge is formed by a face of the cuboid-shaped hydraulic unit facing the electronic control unit and at least one face of the cuboid-shaped hydraulic unit not facing the electronic control unit, and the sealing material at least partially covers both cuboid faces in the connection zone and/or sealing zone.

Abstract: In a method for adjusting the clamping force exerted by a parking brake, which force is applied by an electric-motor braking apparatus and a hydraulic braking apparatus, the electric braking motor impinging upon a brake piston of a hydraulic wheel brake unit of the hydraulic braking apparatus, for the case in which the pre-pressure existing in the hydraulic braking apparatus exceeds a threshold pressure value, an inlet valve in the braking circuit of the hydraulic braking apparatus is closed, and the target braking force is established by actuation of the electric-motor braking apparatus.

Abstract: A method for transferring brake fluid into a wheel brake cylinder of a brake system of a vehicle includes: controlling a switchover valve, via which a brake circuit having the wheel brake cylinder is connected to a main brake cylinder, into a closed state; subsequently reducing a booster force of a brake force booster, which is exerted upon an adjustable piston of the main brake cylinder; controlling a high-pressure switchover valve to a partially opened state after the reduction of the booster force of the brake force booster; and sucking in brake fluid via the partially opened, high-pressure switchover valve and pumping the brake fluid into the at least one wheel brake cylinder.

Abstract: In a braking device for a vehicle, an operating characteristics setting portion is provided for setting an operating characteristic which is a relationship between the input electric power to the electro-magnetic valve and a pressure difference between a master cylinder side and a wheel cylinder side with respect to the electro-magnetic valve, based on the input electric power at the time when the accumulator pressure detected by the accumulator pressure detecting portion first falls to a value equal to or less than a threshold value accumulator pressure by changing the input electric power towards an opening side of the electro-magnetic valve in response to a time lapsed after a predetermined value of the pilot pressure has been generated by the pilot pressure generating portion by first closing the electro-magnetic valve thereby to suppress the manufacturing cost.

Abstract: A vehicle braking system includes an operation amount detector, a hydraulic pressure source, a controller, and a wheel cylinder. The hydraulic pressure source is to generate brake hydraulic pressure corresponding to an amount of operation detected by the operation amount detector. The wheel cylinder is to be operated by the brake hydraulic pressure generated by the hydraulic pressure source. The hydraulic pressure source includes a first actuator and a second actuator. The first actuator includes a piston and an electric motor. The electric motor is configured to move the piston forwardly to generate the brake hydraulic pressure. The second actuator includes a pump configured to pressurize brake fluid located downstream of the first actuator. The controller is configured to selectively operate the first actuator and the second actuator based on the amount of operation detected by the operation amount detector.

Abstract: A method for operating a motor vehicle hydraulic braking system having at least one electric motor-operated braking pressure generator. The output power of the electric motor-operated braking pressure generator is restricted during normal driving/braking situations and the restriction is temporarily deactivated upon identification of a critical driving situation, such as an overstressing of the brake system to include brake fade.

Abstract: A brake control apparatus includes a first pressure-applying section connected through a first oil passage to a wheel cylinder; a pump; a communication valve provided on a second oil passage which connects the first oil passage with the pump; a backflow passage connecting a suction side of the pump with a portion between the pump and the communication valve; a pressure-regulating valve provided on the backflow passage; and a control unit. The control unit attains a first state that causes the first pressure-applying section to apply hydraulic pressure to the wheel cylinder, and a second state that causes the pump to apply hydraulic pressure to the wheel cylinder by driving the pump and at least one of the communication valve and the pressure-regulating valve. The control unit actuates the at least one with a delay relative to an actuation of the pump, when switching to the second state.

Abstract: A reservoir container has a reservoir, and a communicating passage that guides brake fluid to the reservoir. The reservoir of the reservoir container that accumulate the brake fluid is made to a hole extending in a transverse direction so that a size of the reservoir container in a height direction is made small while fully securing the capacity of the reservoir. Moreover, a horizontal plane projected area of the communicating passage is made smaller than that of the reservoir, so that a sealing part of the communicating passage is shortened, and ensures the seal integrity.

Abstract: A vehicle braking system includes a master cylinder coupled to a brake pedal and establishing fluid communication to wheel cylinder(s) of primary and secondary circuits via respective outputs. A pressure sensor detects actual, non-boosted demand pressure. Each circuit includes a motor-driven pump defining pressure and suction sides, inlet and outlet valves, a normally-closed isolation valve, and a normally-closed apply pressure control valve. A pedal feel simulator receives hydraulic fluid from the master cylinder when the isolation valves are closed. A controller receives a signal from the pressure sensor and generates corresponding control signals for the motor-driven pump and the apply pressure control valve of each circuit to pressurize the pressure side of each circuit equal to the sensed demand pressure plus a predetermined boost factor, and the actual pressure at each wheel cylinder is configured for individual manipulation by selective opening and closing of the inlet and outlet valves.

Abstract: Disclosed is an integrated braking system including a hydraulic piston cylinder that is moved by a brake pedal, a pressure medium storage that is connected to the hydraulic piston cylinder, a pressure generating unit that is driven by a motor, and has two first and second hydraulic chambers that are divided by a piston within a housing, and a pressure control unit that transmits a pressure to a wheel unit from the hydraulic piston cylinder and the pressure generating unit. A hydraulic line connecting the first hydraulic chamber and the pressure medium storage is formed.

Abstract: A brake device includes: a mechanical pressure regulating part having a high-pressure port, a low-pressure port, a pilot pressure input port, and an output port which outputs fluid pressure corresponding to the pressure supplied to the pilot pressure input port by fluid pressures supplied to both of the high- and low-pressure ports, to a chamber for a master piston; a high-pressure source connected to the high-pressure port and the pilot pressure input port; a low-pressure source connected to the low-pressure port and the pilot pressure input port; and an electrically-operated pilot pressure generating part which includes control valves for controlling flows of the brake fluid between the high-pressure source and the pilot pressure input port, and between the low-pressure source and the pilot pressure input port, respectively, and which outputs desired fluid pressure to the pilot pressure input port by controlling flow of the brake fluid with control valves.

Abstract: A vehicle controlling system includes an engine serving as a power source of a vehicle; an electric storage device; an assist device that assists an operation of a driver by consuming power from the electric storage device so as to operate a running device that changes the running condition of the vehicle; and a starting device that consumes power from the electric storage device so as to start the engine, wherein the starting device automatically starts the engine based upon a physical quantity concerning the engine, and the start of the engine is inhibited while the assist device operates the running device, when the execution of an inertial running in which the engine is stopped to allow the vehicle to run with inertia.

Abstract: A method for actuating a hydraulic vehicle brake system, includes a master brake cylinder with a preferably electromechanical brake booster and a wheel slip control device. The master brake cylinder is actuated simultaneously with the brake booster, and hydraulic pumps of the wheel slip control device are driven by an electric motor. Pressure builds more quickly in the wheel brakes of the vehicle brake system for safety and assistance functions that require high pressure build-up dynamic. The method also increases the wheel brake pressure using the pressure that can be generated by actuating the master brake cylinder with the brake booster.

Abstract: A braking system for a vehicle includes: a brake input element for an actuation to input a brake pressure signal by a driver; a brake master cylinder coupled to the brake input element and supplied with hydraulic fluid from a hydraulic fluid reservoir fluidically connected to the brake master cylinder; and a first brake circuit. The first brake circuit has: a switchover valve with controllable through flow rate for the hydraulic fluid; a pressure regulating valve with controllable through flow rate for the hydraulic fluid; a hydraulic pump for optionally building up an elevated hydraulic fluid pressure in the first brake circuit; at least one first wheel brake cylinder exerting a braking torque on a first vehicle wheel coupled to the wheel brake cylinder; and a first fluid line from the hydraulic fluid reservoir being fluidically connected to the pressure regulating valve and to the hydraulic pump.

Abstract: A hydraulic vehicle brake system including a brake line for conducting a hydraulic pressure medium and a master cylinder attached to a non-pressurized storage vessel. A wheel brake has a first pressure modulation valve on the inlet side and a second pressure modulation valve and a low-pressure accumulator on the outlet side of the wheel brake. A pump is disposed on a return line downstream of the low-pressure accumulator for removing pressurizing medium from the low-pressure accumulator to regulate the brake pressure via the first pressure modulation valve and also via an isolation valve disposed in the brake line upstream of the first pressure modulation valve. An electromagnetically opening changeover valve is inserted in a pump suction line discharging into the return line between the master cylinder and the low-pressure accumulator. The pressure provided by the master cylinder can be fed to the low-pressure accumulator, bypassing the wheel brake.

Abstract: A first and a second rotary pumps are provided in a first pump casing of a pump body, which is inserted into a cylindrical recessed portion of a housing 101. A first outlet port is opened at a first space formed between a bottom surface of the cylindrical recessed portion and an axial forward end surface of the first pump casing, so that discharge pressure of working fluid of the first pump is supplied to the first space. A second outlet port is opened at a second space formed between an axial backward end surface of the first pump casing and an axial forward end surface of a second pump casing, so that discharge pressure of working fluid of the second pump is supplied to the second space.

Abstract: A brake control system and method that include a master cylinder that transmits braking hydraulic pressure to a wheel and a hydraulic power unit that supplies hydraulic pressure to the master cylinder to produce the braking hydraulic pressure transmitted to the wheel. A push rod is operated according to a brake pedal operation and a push rod cylinder is formed for the push rod to perform reciprocal motion in the push rod cylinder. A reaction force producer supplies hydraulic pressure to the push rod cylinder to produce reaction force against the push rod operation. A solenoid within the reaction force producer is operated by electric power to produce the reaction force. A pedal stroke sensor detects a brake pedal stroke and a brake control unit connected to the hydraulic power unit, the reaction force producer, and the pedal stroke sensor, operates the hydraulic power unit and the reaction force producer.

Abstract: A brake system for a motor vehicle which simplifies the hydraulic design and avoids a vacuum prevailing over a relatively long period of time. The first hydraulic unit has a suction volume, which is connected to the suction side of the pump and which, in the event of a change in the pressure on the suction side of the pump, provides a pressure and volume equalization by means of the brake fluid stored in the suction volume, with an elastic element.

Abstract: The brake fluid cooling systems may be used for cooling the brake fluid in a hydraulic brake system. A pump may have an outlet port in fluid communication by a first conduit with a pressure port of a brake wherein there may be a check valve in the first conduit oriented to allow flow from the pump and not to the pump. A bleed port of the brake in fluid communication with a master brake cylinder. The master brake cylinder in fluid communication with an inlet port of the pump.

Abstract: A double internal gear pump has two internal gear pumps having a common pump shaft. A partition is formed between the two internal gear pumps, and the partition has a frustoconical circumferential surface which contacts an opposing in a sealing manner in a pump housing. Pump inlets and pump outlets can be led through the partition. The frustoconical circumferential surface of the partition is advantageous because it removes the necessity of pressing into the pump housing and canting the partition. In addition, a seal on the circumference of the partition is ensured with great realiability.

Abstract: In a BBW type brake device, if a slave cylinder becomes inoperable, when a master cylinder is operated for the first time, a master cut valve is opened to charge brake fluid into a reservoir of a hydraulic modulator, and since the brake fluid charged into the reservoir is increased in pressure by driving a hydraulic pump when the master cut valve is closed, wheel cylinders are operated. Since the amount of brake fluid on the downstream side relative to the master cut valve is increased by charging the reservoir with brake fluid, it is possible to increase the pressure of the brake fluid of the reservoir by driving the hydraulic pump and generate brake fluid pressure by a hydraulic modulator that is higher than the brake fluid pressure generated by the master cylinder, thereby generating sufficient braking force without increasing the depressing force applied to a brake pedal.

Abstract: A vehicle brake device includes a hydraulic pressure generating device, a valve device, a pump and an accumulation section forming an accumulation chamber connected to a fluid passage between the valve device and the hydraulic pressure generating device or to a master chamber. A dead band is set in which the change of force of the magnitude corresponding to the hydraulic pressure in the master chamber does not substantially act on a brake operating member. A characteristic representing the relation between the pressure and the brake fluid quantity in the accumulation chamber is set based on a characteristic representing the relation between the pressure and the brake fluid quantity in a wheel cylinder and the dead band so that, when brake fluid is flowing into and from the accumulation chamber, a force of the magnitude corresponding to the master chamber hydraulic pressure does not act on the brake operating member.

Abstract: A hydraulically actuated regulating valve for a vehicle brake system includes a first fluid port, a second fluid port, and a control chamber. A longitudinally movable plunger with a sealing geometry is loaded with a spring force and held in an initial position by a compression spring. A pressure built up in the control chamber acts counter to the compression spring and moves the plunger with the sealing geometry from the initial position into an end position. The sealing geometry interacts with a valve seat which is positioned in a valve body in order to limit an effective pressure at the second fluid port to a predefined maximum pressure value. A fluid connection between the first and second fluid port is completely opened up to a corresponding vehicle brake system in a first end position of the plunger and is completely closed in a second end position of the plunger.

Abstract: A controller sets a target hydraulic pressure of a master cylinder based on the operation amount of a brake pedal, and controls the action of an electric motor so that a master cylinder hydraulic pressure attains the target hydraulic pressure. A brake characteristic representing a relationship between a motor rotation position detected by a resolver and the master cylinder hydraulic pressure as detected by the hydraulic pressure sensor is stored and updated. When the hydraulic pressure sensor is abnormal, a target motor rotation position corresponding to the target hydraulic pressure is set using the updated brake characteristic, and the action of the electric motor is controlled. The electric motor is controlled based on the updated brake characteristic, and hence fluctuations in the vehicle deceleration with respect to the brake operation can be suppressed and a sense of discomfort for the driver can be alleviated.