Abstract: The invention relates to an electromechanical brake force booster for a hydraulic vehicle brake system. The invention proposes that the brake force booster be formed with two restoring springs, one of which acts on an electromechanical actuator and the other of which restoring springs acts on a pedal rod. In the event of failure of the electromechanical actuator, only the other spring, which preferably has a relatively low spring force, must be compressed using muscle force. The force loss in the event of actuation exclusively by muscle force is reduced.

Abstract: A brake system with a master cylinder, a first piston which is coupled to a brake pedal via a push rod transmitting actuating forces, a second piston which can be actuated by the first piston and which can be brought into force-transmitting connection to a third piston, via which the master cylinder is actuated, at least one elastic element which forms a pedal travel simulator which, in the “brake-by-wire” operating mode, gives the vehicle driver a pleasant pedal sensation, an interspace capable of being acted upon with hydraulic pressure, between the second and the third piston, the action of pressure upon the interspace loading the second and the third piston in opposite directions, a pressure supply device which has a high-pressure source and which allows both a filling of the interspace with pressure medium and emptying thereof, and a valve device for varying pressure fed in the interspace.

Abstract: The three-way valve simulator (100) for a vehicle brake servo comprises: a control piston (106); and a reaction piston (140) remote from the control piston when the simulator is at rest. It is arranged such that the control piston, under the effect of a command transmitted from outside the simulator, can be moved over a predetermined travel in the direction of the reaction piston without transmitting stress to the latter.

Abstract: First hydraulic-pressure supply piping extended from an accumulator is connected to a first supply port (that is, to a second pressure chamber) of a cylinder, and to second hydraulic-pressure delivery piping of an ABS via third hydraulic-pressure supply piping having a third linear valve. When the braking hydraulic pressure Pf is reduced in the ABS, the degree and the period of time that the third linear valve is opened are set according to the amount of fluid discharged from the second hydraulic-pressure delivery piping to a reservoir tank through a pressure-reducing valve so that a certain amount of fluid is returned from the first hydraulic-pressure supply piping to the second hydraulic-pressure delivery piping via the third hydraulic-pressure supply piping.

Abstract: A vehicle braking apparatus includes: a control piston configured to operate so that a reaction force based on the fluid pressure of the boosted fluid pressure application chamber is balanced with a braking operation input from the brake operation member; an elastic member including: a first face adapted to contact with a simulator piston connected to the brake operation member and slidably accommodated in the control piston; and a second face; a sliding member adapted to contact with the second face, the sliding member being accommodated in the control piston; a spring disposed between the sliding member and the control piston; and an odd-shaped portion disposed on at least one of the first and second faces of the elastic member, the odd-shaped portion configured to increase a contacting area of the elastic member and at least one of the simulator piston and the sliding member.

Abstract: A brake booster wherein second and third pistons are separated within a bore of a master cylinder to define second and third chambers. Compensation valves control the flow fluid from a reservoir to the bore while a passage in the second piston connects the second chamber with the third chamber that is connected to the reservoir through an tilt valve that is held opened by pressurized fluid acting on a fourth piston. A control valve responds to a resiliently applied force from an input rod carried by the third piston to supply pressurized fluid to the brake system. In an event pressurized fluid is unavailable, a spring moves the fourth piston and a sixth spring to moves the tilt valve against a seat to seal the third chamber and create a hydraulic lock. Further movement of the third piston correspondingly moves the second piston to effect a manual brake application.

Abstract: A brake system for a vehicle including a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by movably supporting an input piston and a pressure piston in a cylinder. A high-pressure supply pipe of an accumulator is coupled to wheel cylinders via hydraulic supply pipes, and coupled to the rear pressure chamber via a hydraulic supply pipe and a second hydraulic pipe. Pressure booster valves and pressure reducing valves are attached to the hydraulic pressure supply pipes, respectively. The wheel cylinder is coupled to the front pressure chamber via the first hydraulic pipe, and a coupling pipe for coupling a first hydraulic pipe and the hydraulic supply pipe is provided with the switching valve.

Abstract: A vehicle braking system including an input piston and a pressure piston that are moveably supported within a cylinder. The input piston is allowed to depress the pressure piston and is connected to the a brake pedal. Pressure chambers to the front and to the rear of the input piston are communicated through a communication passage such that the control hydraulic pressure in accordance with the operation amount to the brake pedal is applied to the second pressure chamber via first and second linear valves. The control hydraulic pressure in accordance with the operation amount to the brake pedal that has been transmitted to the pressure piston through the input piston is regulated by a pressure regulating valve so as to be applied to the second pressure chamber. The braking hydraulic pressure may be output from the pressure chambers, respectively.

Abstract: A brake control device is provided, which is capable of providing a precise diagnosis on a trouble on a hydraulic pressure valve etc., so as to provide an appropriate output hydraulic pressure corresponding to a stroke amount of a brake pedal. In this device, an electromagnetic valve is provided on a hydraulic pressure passage allowing an auxiliary hydraulic pressure chamber to communicate with an accumulator, and is controlled to open when such a trouble occurs that output hydraulic pressure from the hydraulic pressure valve becomes lower than a predetermined range; and an electromagnetic valve is also provided on a hydraulic pressure passage allowing the auxiliary hydraulic pressure chamber to communicate with a reservoir, and is controlled to open when such a trouble occurs that the output hydraulic pressure from the hydraulic pressure valve becomes insufficiently reduced.

Abstract: A braking system having a master cylinder to which wheel brake circuits (I, II) can be connected, a first piston coupled to a brake pedal, a second piston by means of which the master cylinder is actuated, a third piston actuated by the first piston and connected in a force transmitting fashion to the second piston, a simulation device which gives the driver of the vehicle a pedal sensation, an intermediate space between the second piston and third piston, a pressure generating device which controls the pressure in the intermediate space, a pressure medium reservoir vessel which is under atmospheric pressure and which can be connected hydraulically to the intermediate space, and means for electrically controlling the pressure in the intermediate space.

Abstract: When an electrical fluid pressure generator fails and a wheel cylinder is operated by brake fluid pressure generated by a master cylinder, if a first fluid pressure system leading to a rear fluid chamber of the electrical fluid pressure generator fails and is opened to the atmosphere, braking is performed by brake fluid pressure of a second fluid pressure system transmitted from the master cylinder through a front fluid chamber of the electrical fluid pressure generator to a wheel cylinder. At this time, a front supply port, which communicates through a front second cup seal, does not communicate with the master cylinder but with a reservoir. Such configuration prevents leakage of the brake fluid pressure generated by the master cylinder through the front supply port, the front second cup seal and the rear fluid chamber, thereby ensuring braking by the second fluid pressure system.

Abstract: In a brake system, two first fluid pressure chambers of a master cylinder respectively communicate with two second fluid pressure chambers of a motor cylinder. The two second chambers communicate with four wheel cylinders through an ABS. The wheel cylinders are operated by brake fluid pressure generated by the master cylinder in an abnormal situation where the motor cylinder is non-operational. The brake system includes two separate independent fluid pressure lines: one line extending from one of the first chambers in the master cylinder to the wheel cylinders via one of the second chambers in the motor cylinder; and the other line extending from the other first chamber in the master cylinder to the wheel cylinders via the other second chamber in the motor cylinder. Thus, even if an abnormality occurs in one of the two fluid pressure lines, a minimum necessary braking force is secured.

Abstract: A brake system, in particular a dual circuit brake system, for a motor vehicle, includes brakes which can be activated by a brake pedal operatively connected to a brake servo. Each brake engages one wheel. The brake system is designed such that a brake servo is assigned to each brake of at least one brake circuit, and the brake servos can be activated by the brake pedal.

Abstract: A method is described which is used to check the correct function of the under-pressure brake system of a motor vehicle having an internal combustion engine and in particular of the output signals of a pressure sensor. The pressure sensor is arranged in the under-pressure region of the brake system.

Abstract: The invention relates to a brake control system for motor vehicles and, in particular, to a hydraulic control system. The invention also applies to hybrid braking systems such as those provided in hybrid vehicles (vehicles propelled electrically and propelled using internal combustion engines) comprising a hydraulically operating braking system which comprises a simulator (3) not mechanically coupled to the brake booster piston (42) and an electric braking system using the electric propulsion motor or motors as electric generators.

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: Disclosed herein are a sealing member for a master cylinder and a master cylinder having the same. The master cylinder is configured such that a communication hole of a piston is rapidly brought into communication with an oil path toward an oil tank upon release of braking. This may minimize meaningless retracting movement of the piston and delay in a braking release operation. The sealing member for the master cylinder includes an outer wing part to come into contact with the cylinder body, and an inner wing part to come into contact with the outer surface of the piston. The inner wing part includes a seal formed at a tip end thereof and at least one oil passage formed in a surface thereof opposite the outer surface of the piston.

Abstract: A pressure regulating valve unit 7 is configured to be electrically driven according to a detection value of a detection unit 74 adapted to detect an amount of brake application effort made by a brake operation member 5 so as to switch states of the vehicle brake apparatus between a state where a boosted hydraulic pressure chamber 9 is made to communicate with a hydraulic pressure generating source 6 while a communication between the boosted hydraulic pressure chamber 9 and a reservoir R is interrupted, a state where the communication between the boosted pressure chamber 9 and the hydraulic pressure generating source 6 is interrupted while the boosted pressure chamber 9 is made to communicate with the reservoir R, and a state where the boosted hydraulic pressure chamber 9 is disconnected from both the hydraulic pressure generating source 6 and the reservoir R.

Abstract: A supply valve (40), a relief valve (42) and a microprocessor (46) control the supply of pressurized hydraulic fluid from a dedicated pressure source (12) to a brake boost piston (18, 60, 108) interposed between an operator brake pedal (22) input member (20, 106) and a master cylinder. Transducers (48, 50, 102) sense a current relationship between the input member (20, 106) and the boost piston (18, 60, 108) and supply the microprocessor (46) with a input to accordingly operate the supply valve (40) and relief valve (42). In one embodiment, a single transducer (102) senses relative motion between the input member and the piston while in a second embodiment, a single transducer (48) senses the force exerted on the piston by the input member and a third embodiment first and second transducers (48, 50) to sense relative motion between the input member and the piston.

Abstract: In a brake system including a master cylinder and an electrically-driven hydraulic pressure generator with front and rear pistons, when the hydraulic pressure generator cannot be operated and a failure of a first hydraulic system linked to a rear fluid chamber of the generator occurs and makes a first hydraulic system open to the atmosphere, the brake-fluid pressure of a second hydraulic system transmitted from the master cylinder to a wheel cylinder via a front fluid chamber of the generator is used to perform braking. A forward-facing third front cup seal provided at an intermediate portion of the front piston prevents the brake-fluid pressure generated by the master cylinder from leaking out from a front supply port via the rear fluid chamber. At the same time, a stopper prevents the pressure of the front fluid chamber from moving the front piston excessively backward. The braking is accordingly secured by use of the second hydraulic system linked to the front fluid chamber of the motor cylinder.

Abstract: The invention relates to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, which fuel injector comprises an injection valve element, for opening and closing at least one injection opening and a pressure booster, by way of which fuel which is at system pressure is compressed to injection pressure. The pressure booster is actuated via a first control valve and the injection valve element is actuated via a second control valve. The pressure booster comprises a pressure booster piston which is assigned a spring element which is supported by way of one side on the injector housing and by way of the other side on the pressure booster piston. The pressure booster piston delimits a compression chamber, a differential pressure chamber and a control chamber.

Abstract: A method for operating a hydraulic vehicle braking system having an electromechanical brake booster is disclosed. A shut-off valve that is located between a brake master cylinder and wheel brakes is closed to maintain a wheel-brake pressure and thus a braking force. To maintain a constant braking force, no current must be applied to an electric motor of the brake booster. The vehicle braking system can be used as a parking brake. The shut-off valve is present if the vehicle braking system has an anti-lock control device.

Abstract: A stroke simulator in a brake system includes a cylinder body, a piston movably inserted in the cylinder body, and a second elastic member adapted to be pressed by the piston. It functions to give a simulative operational feel to a brake lever by operating the brake lever to generate a fluid pressure in a front wheel master cylinder and transmit this fluid pressure to the cylinder body, thereby deforming the second elastic member through the piston, and wherein annular recesses are formed on the outer circumferential surface of the second elastic member.

Abstract: A pressure regulating valve unit is configured to regulate the output hydraulic pressure of a hydraulic pressure generating source through electrical control for application to a boosted hydraulic pressure chamber, and a release valve is interposed between the boosted hydraulic pressure chamber and a reservoir which is adapted to the hydraulic pressure in the boosted hydraulic pressure chamber to the reservoir side when the pressure regulating valve unit fails.

Abstract: A hydraulic vehicle brake system, which has a brake pressure signal generator which can be activated by a brake activation device, wherein the brake pressure signal generator can be connected to wheel brakes of the vehicle via at least one hydraulic line and is composed essentially of a master brake cylinder and a hydraulic booster which is connected upstream and which has a return flow chamber and a boosting chamber, a working piston arranged therein and a control piston, wherein the working piston is operatively connected in the force outputting direction to a master brake cylinder piston via an activation element, and a hydraulic pressure of a hydraulic pressure source can be applied to the booster via an inlet for the purpose of boosting braking force, wherein an outlet of the booster can be connected to a reservoir vessel.

Abstract: A braking device includes: an input member configured to interlock with a displacement of a brake pedal; an output member which is movable relatively to and independently of the input member and is configured to generate a fluid pressure in a master cylinder; a braking mechanism configured to exert a braking force on a wheel by the fluid pressure generated in the master cylinder; drive means configured to drive the output member independently of the input member; and a clutch mechanism which is provided between the input member and the output member and configured to engage the input member with the output member so as to allow the input and output members to uniformly move when the output member is not driven by the drive means, and to cancel the engagement between the input member and the output member when the output member is driven by the drive means.

Abstract: The control device adapted to a vehicle brake apparatus includes a vacuum obtaining portion, a master cylinder pressure obtaining portion and a boosting control portion for executing a boosting control which controls supplying of a boosting pressure established by driving the hydraulic pressure pump and controlling the pressure differential control valve so that the boosting pressure agrees to a target boosting pressure obtained with a target boosting gain smaller than a basic boosting gain which indicates a servo-ratio of the vacuum booster up to the time, when the master cylinder pressure becomes equal to or more than a boosting limit pressure which is a master cylinder pressure corresponding to a boosting limit of the vacuum booster at the vacuum obtained by the vacuum pressure obtaining portion, in addition to the master cylinder pressure established in response to the operation of the brake operation member.

Abstract: A method for operating a hydraulic vehicle braking system that has an anti-lock control unit is disclosed. The system includes a brake master cylinder having an electromechanical brake booster. As the pressure level of the vehicle braking system decreases during an anti-lock control, in which all vehicle wheels are controlled, the boosting force of the brake booster is reduced in an anti-lock control of this type.

Abstract: A vehicle brake hydraulic pressure control unit including a base body including a brake fluid flow path and a mounting hole portion having a bottom sealing surface and an inner circumferential sealing surface and an assembled part which is assembled into the mounting hole portion so as to communicate with the flow path. The assembled part includes a lower end sealing portion hermetically contacting with the bottom sealing surface of the mounting hole portion to form a lower side sealing portion and an outer circumferential sealing portion hermetically contacting with the inner circumferential sealing surface of the mounting hole portion to form a circumferential sealing portion. A hermetic accommodation space is defined by the lower side sealing portion and the circumferential sealing portion.

Abstract: A system including: a liquid-pressure source device that can supply working fluid to a brake device; and an ABS valve device. The system executes a first control in which a supply pressure of the working fluid becomes a target supply pressure and a second control for making the supply pressure fall within the target range. In this system, when the valve device is not being operated, the first control is executed. When the valve device is being operated, the second control is normally operated, and when the supply pressure is higher than a threshold value, the first control is executed. Where completion of the operation of the valve device is estimated, the system performs at least one of reducing the threshold value, reducing an upper limit value of the target range, increasing an electric power supplied to a pressure-reduce linear valve during the first control when the valve device is being operated, and reducing the target supply pressure.

Abstract: An electric brake has a master cylinder (12) including pistons (22, 24) for rear and front brake circuits and an electric motor (50) for actuating the rear brake piston (22). A feedback circuit provides a signal indicative of the fluid pressure supplied to the rear brake circuit and is operable in response to driver commanded braking force (48) to supply fluid pressure to the rear wheel brake circuit. A mechanical coupling (44, 46) between the second piston and a brake pedal is responsive to driver applied brake pedal force to supply fluid pressure to the front wheel brake circuit. A fluid circuit (30, 82) utilizes the fluid pressure supplied to the rear wheel brake circuit to augment driver applied brake pedal force thereby supplying power boosted fluid pressure to the front wheel brake circuit.

Abstract: It is an object of the present invention to minimize any sensation of inadequate firmness and large changes in deceleration rate with respect to a change in a brake operation force when the force exceeds a boost limit point. A first correlation S1 when a brake operation force increases and a second correlation S2 after hysteresis is applied at the time of a decrease in the brake operation force are taken as relationships between a brake operation force F and a wheel cylinder pressure PWC in a state wherein an assist hydraulic pressure PA is not applied.

Abstract: Faster shifting operation and reduced shift shock in response to a braking operation during a lift-foot-up shifting may be achieved when an automatic transmission is controlled by a method for compensating a hydraulic pressure that includes: determining whether a lift-foot-up shifting of the automatic transmission is under control; calculating a vehicle speed of a vehicle; calculating a deceleration rate of the vehicle; calculating a compensation hydraulic pressure to be applied to a friction member of the transmission, based on the deceleration rate; calculating a on-coming pressure based on the calculated compensation hydraulic pressure; and applying the calculated on-coming pressure to the friction member.

Abstract: A braking system for a motor vehicle includes a hydraulic circuit for producing a brake force, the hydraulic circuit having a pressure source for producing a hydraulic pressure and a pressure store, the pressure store of the hydraulic circuit being able to be supplied with hydraulic fluid from a delivery side of the pressure source if necessary. In this braking system, there is provision for the pressure store to be able to be coupled in fluidic terms to an intake side of the pressure source by means of an interposed actively controllable multi-way valve, in particular a two-way solenoid valve, and for the pressure store to be able to be decoupled therefrom.

Abstract: The invention relates to a brake system, comprising at least one piston-cylinder unit for producing a pressure in at least one working chamber, the working chamber being connected to at least one wheel brake via at least one hydraulic line, and the brake system comprising at least one drive device and an actuating device, particularly in the form of a brake pedal, and the drive device during normal operation acting on the at least one first piston of the piston-cylinder unit for building pressure and reducing pressure by way of a first force transmission means, and in the event of failure of the drive device the actuating device acting mechanically on the piston by way of a second force transmission means, wherein the adjustment of the second force transmission means disengages the connection between the first force transmission means and the piston by means of the actuating device.

Abstract: In an optimized hydraulic brake system, a pedal travel sensor is used to improve pedal feel. In order to improve pedal feel, a low pressure is detected in the brake booster and the brake hydraulic system is used to increase wheel pressure. This prevents the operator from having to exert an increasing large force on the brake pedal during a deceleration situation.

Abstract: In a brake controller, a slope climbing vehicle stop detecting means determines when the vehicle is stopped while climbing a slope, and a pedal release detecting means determines that the pedal is released. An assist control unit interpolates a decrement in brake fluid pressure in the master cylinder due to an input piston movement caused by a release of a brake pedal. An assist piston is controlled by an electric motor to restore and maintain the fluid pressure within the master cylinder.

Abstract: The invention proposes equipping a hydraulic vehicle brake system with a pedal travel modulator that has an electromechanically driven piston-cylinder unit. The piston-cylinder unit upon brake actuation “furnishes” additional brake fluid and thereby boosts a pedal travel of the vehicle brake system.

Abstract: In a braking apparatus for a vehicle, an input piston and a pressurizing piston are movably supported inside a cylinder, thereby sectioning a first pressure chamber, a second pressure chamber, and a third pressure chamber, the second pressure chamber and the third pressure chamber communicating with each other through a communicating path. An ECU causes a control hydraulic-pressure that is adjusted by first and second liner valves to act on the second pressure chamber from the third pressure chamber, thereby assisting the pressurizing piston to enable to output control hydraulic-pressure from the first pressure chamber. A counterforce chamber whose volume decreases as the input piston moves forward is provided inside a cylinder, and a counterforce giving mechanism that can give an operation counterforce to a brake pedal through the input piston by deforming corresponding to decrease of the volume of the counterforce chamber is provided inside the input piston.

Abstract: In a brake system, when setting a control origin position for a resolver for detecting a moved position of a booster piston, communication between a master cylinder and wheel cylinders is interrupted by cut valves. Thereafter, the booster piston is moved forward by an electric actuator in a direction in which a hydraulic pressure is generated so that a position detected by the resolver upon detection of generation of the hydraulic pressure by a hydraulic pressure sensor (position at a time of generation of hydraulic pressure) is obtained. A position obtained by moving backward the position at the time of generation of hydraulic pressure by a predetermined amount is set as the control origin position.

Abstract: The invention relates to a technology for effecting electronic brake force distribution in a vehicle brake system, which is equipped with a hydraulic brake boosting, comprising detecting a state requiring an electronic brake boosting and a limiting of the brake pressure generation of the hydraulic brake boosting according to the electronic brake boosting.

Abstract: The invention relates to a master brake cylinder arrangement for a hydraulic motor vehicle brake system having a housing, in which two adjacent cylinder bores are provided, two piston arrangements, in which a first piston arrangement is received in a first cylinder bore of the cylinder bores such that it is displaceable along a first longitudinal bore axis and in which a second piston arrangement is received in a second cylinder bore of the cylinder bores such that it is displaceable along a second longitudinal bore axis, a force input piston which can be coupled, or is coupled, to a brake pedal and which is displaceably guided along an actuating axis in a cutout of the housing, the first piston arrangement and the second piston arrangement being displaceable according to a movement of the force input piston, in which the first piston arrangement delimits a first pressure chamber with the housing, said pressure chamber being fluidically connected to a hydraulic brake system, and in which the second piston arr

Abstract: A brake system includes a master cylinder which generates brake fluid pressure by a braking operation of a driver, an electric motor driven slave cylinder that generates brake fluid pressure according to an electrical signal based on the braking operation of the driver, a vehicle wheel cylinder for braking a wheel by the brake fluid pressure generated in the master cylinder or the slave cylinder, a brake light that informs a following vehicle of the operation of the wheel cylinder, and a first sensor and a second sensor that detect stroke positions of the brake pedal. During normal operation of the brake system the brake fluid pressure generated in the slave cylinder is transferred to the wheel cylinder. During abnormal operation of the brake system, the brake fluid pressure generated in the master cylinder is transferred to the wheel cylinder.

Abstract: A vehicle braking apparatus includes: a control piston configured to operate so that a reaction force based on the fluid pressure of the boosted fluid pressure application chamber is balanced with a braking operation input from the brake operation member; an elastic member including: a first face adapted to contact with a simulator piston connected to the brake operation member and slidably accommodated in the control piston; and a second face; a sliding member adapted to contact with the second face, the sliding member being accommodated in the control piston; a spring disposed between the sliding member and the control piston; and an odd-shaped portion disposed at least one of the first and second faces of the elastic member, the odd-shaped portion configured to increase a contacting area of the elastic member and at least one of the simulator piston and the sliding member.

Abstract: A hydraulic brake apparatus for use in a vehicle having wheels and a brake operating member manually operable by a driver, the apparatus including a manual pressure source including (a) a hydraulic booster which boosts an operating source applied by the driver to the brake operating member and produces a first hydraulic pressure corresponding to the boosted operating force, and (b) a master cylinder which produces a second hydraulic pressure corresponding to the boosted operating force as an output of the hydraulic booster; a power pressure source which produces, by utilizing a power, a third hydraulic pressure irrespective of whether the brake operating member is operated; hydraulic brakes which are provided in association with the wheels, respectively, and include respective brake cylinders, and each of which, upon supplying of a hydraulic pressure to a corresponding one of the brake cylinders, applies a hydraulic braking force to a corresponding one of the wheels; a hub portion which is connected to each o

Abstract: A brake apparatus capable of applying a regulator pressure regulated by a regulator valve device to an assisting chamber, to obtain a smooth brake feeling, even when a brake pedal is operated by a vehicle driver, during an automatic braking operation. A first control valve is disposed in a power pressure passage for controlling hydraulic pressure in the assisting chamber to be increased. A changeover valve device is disposed in a regulator pressure passage for selecting either one of a communicating state and a shutting-off state of the passage. A second control valve is connected to the regulator pressure passage between the changeover valve device and the assisting chamber, and controls the hydraulic pressure in the assisting chamber to be decreased.

Abstract: A brake system includes a tandem-type master cylinder, a tandem-type slave cylinder with front and rear fluid pressure chambers and front and rear pistons arranged such that fluid pressure is generated in the fluid pressure chambers when the rear piston is advanced by an actuator, wheel cylinders connected to the fluid pressure chambers of the master cylinder, respectively, and a regulator which regulates a maximum distance between the front and rear pistons. The regulator prevents excessive increase in the volume of the rear fluid pressure chamber.

Abstract: Hydraulic brake system for a land vehicle comprising a control unit ECU that is devised such that it supplies control signals ECU for controlling automatic braking operations of the brake system, a master cylinder, which has an output side, for generating brake pressure under the control of a driver, a first brake circuit I comprising a first controllable pump, which has an output side, for generating brake pressure in the first brake circuit I under the control of the control unit ECU, and a first valve arrangement having an input side, which is fluidically connected to the output side of the master cylinder, and an output side, which is fluidically connected to the output side of the first pump, wherein the first valve arrangement has an open operating state, in which the input side and the output side of the first valve arrangement are fluidically connected, and a closed operating state, in which the fluid connection between the input side and the output side of the first valve arrangement is interrupted,

Abstract: In a brake-by-wire brake system for a motorcycle, a pressure regulator is interposed between a pressure-generating unit and a brake caliper to regulate an output hydraulic pressure of the pressure generator, and to apply the regulated hydraulic pressure to a brake caliper. The pressure regulator is controlled by a control unit, based on input from an applied operating force detector, to minimize or prevent influences of engine vibration and heat on the pressure regulator. The pressure regulator is arranged between an engine body and a fuel tank disposed in back of an intake system connected to and extending upwardly from a cylinder head of the engine body; where the intake system is disposed on an upper side of the engine body. The pressure regulator is flexibly supported, through a flexibly resilient case, by a support cage attached to a body frame.

Abstract: A brake system for a motorcycle includes a pressure-regulating unit interposed between a fluid pressure-generating unit and a wheel brake. Operation of a pressure-regulating unit is managed and controlled by a control unit, based primarily on an applied force detected by an operating amount detector. The fluid pressure-generating unit is disposed between an engine body, mounted on a body frame, and an exhaust pipe which is connected to a front surface of a cylinder head of the engine body, and which extends downwardly from the cylinder head. The fluid pressure-generating unit is arranged on the body frame such that, during operation of the motorcycle, the fluid pressure-generating unit is substantially shielded and isolated from heat emitted by the engine body and the exhaust pipe.