A vehicle braking system includes a wheel cylinder, a brake pedal, a master cylinder, a master cylinder circuit, a primary braking unit operable to generate a braking force at the wheel cylinder in a primary mode, decoupled from the master cylinder circuit, a secondary braking unit including a second electrically-actuated pressure generating unit and operable to generate a braking force at the wheel cylinder in a secondary mode of operation, a plurality of valves configured to provide anti-lock braking at the wheel cylinder upon loss of traction during braking in the primary mode of operation, and a controller programmed to actuate the plurality of valves and further programmed to actuate the second electrically-actuated pressure generating unit upon loss of traction in the primary mode of operation to generate pulsations within the master cylinder circuit to provide a feedback force at the brake pedal indicative of the anti-lock braking.

A vehicle control device is an input device that includes a metallic base substance and an electronic control device mounted on the base substance. The electronic control device includes a housing mounted on a mounting face of the base substance and a control board housed in the housing. A heat dissipating part which is inserted into the housing is provided to protrude from the mounting face, and the heat dissipating part abuts on the control board.

A brake system includes first and second wheel brakes, a reservoir, and a brake pedal unit having a housing and a pair of output pistons slidably disposed in the housing. The output pistons generate brake actuating pressure during a manual push-through mode for actuating the first and second wheel brakes. The system further includes a plunger assembly having a housing having a motor driving an actuator, and a piston connected to the actuator. The piston pressurizes a chamber when the piston is moving in a first direction to provide fluid flow out of a first port and through a pair of parallel valves. The piston pressurizes a second chamber when the piston is moving in a second direction opposite the first direction to provide fluid flow out of a second port. The first and second ports are selectively in fluid communication with the wheel brakes.

Disclosed is an electronic brake system including: a reservoir to store oil; a master cylinder connected to the reservoir and including first and second master chambers and first and second piston provided in the first and second master chambers, respectively, to discharge the oil according to an pedal effort of a brake pedal; a hydraulic pressure generating apparatus provided on at least one of a first reservoir passage connecting the reservoir and the first master chamber and a second reservoir passage connecting the reservoir and the second master chamber; a hydraulic pressure supply apparatus operated by an electrical signal to generate a hydraulic pressure and connected to the master cylinder; and a hydraulic pressure control unit transmitting alternatively the hydraulic pressure discharged from the hydraulic pressure generating apparatus or the hydraulic pressure supply apparatus to a wheel cylinder provided on each of four wheels.

An electric brake system, and more particularly, to an electric brake system and a control method thereof configured for controlling an amount of current applied to a valve in response to a driver's braking intent.

The electric brake system according to an embodiment includes a hydraulic pressure circuit; an inlet valve provided in the hydraulic pressure circuit, configured to control the flow of a hydraulic pressure; a pressure sensor configured to sense a leak of the electric brake system; a pedal displacement sensor configured to sense an amount of requested braking according to the deceleration intent of a driver; and a controller configured to control an amount of current applied to the inlet valve provided in the hydraulic pressure circuit in which the sensed leak occurs, based on the sensed driver's requested braking amount.

A brake system for actuating a pair of front wheel brakes and a pair of second wheel brakes. The brake system includes a reservoir and a brake pedal unit having a housing with first and second pistons slidably disposed in the housing. The first and second pistons are operable during a manual push-through mode by actuation of a brake pedal connected to the brake pedal unit. The first and second pistons are movable to generate brake actuating pressure at first and second outputs for actuating the pair of front wheel brakes and the pair of rear wheel brakes. A first source of pressurized fluid actuates the pair of front wheel brakes and the pair of rear wheel brakes during a non-failure normal braking event. A first electronic control unit controls the first source of pressurized fluid. A second source of pressurized fluid is hydraulically connected to the brake pedal unit and actuates the brake pedal unit to cause movement of the first and second pistons for generating pressure at the first and second outputs. A second electronic control unit, separate from the first electronic control unit, controls the second source of pressurized fluid.

A brake apparatus includes a brake operation member, a state detection unit, a cylinder, a first portion, an operation rod, a stepped piston, first, second, and third seal members, first and second pressure chambers, a hydraulic source, and first and second oil passages. The brake apparatus also includes a fluid amount control unit. The fluid amount control unit is configured to control an amount of the brake fluid to be supplied to the first pressure chamber and the second pressure chamber. The fluid amount control unit is also configured to increase the amount of the brake fluid to be supplied to the second pressure chamber when the detected state is equal to a preset pressure increase request.

A master cylinder and an electronic brake system including the same are disclosed. The electronic brake system includes a main hydraulic-pressure supply device to generate hydraulic pressure by sensing displacement of a brake pedal and a sub hydraulic-pressure supply unit to supply hydraulic pressure to at least one wheel cylinder during an abnormal operation of the main hydraulic-pressure supply device. The master cylinder includes a first piston disposed in a bore of a cylinder body so as to be directly pressurized by the brake pedal, a first hydraulic chamber pressurized by the first piston to discharge hydraulic pressure, a second piston indirectly pressurized by the first piston, and a second hydraulic chamber pressurized by the second piston to discharge hydraulic pressure. The second hydraulic chamber includes a slippage prevention means connected to the sub hydraulic-pressure supply unit so as to prevent the second piston from moving toward the first piston by the hydraulic pressure received from the sub hydraulic-pressure supply unit.

Provided is a brake apparatus capable of securing a braking force on a vehicle even at the time of a fluid leak. The brake apparatus performs control so as to continue generation of a brake hydraulic pressure to be supplied to a wheel cylinder with use of a second hydraulic source if a fluid leak of brake fluid is determined based on a preset relationship between a hydraulic pressure of a first hydraulic source and a stroke of a brake pedal.

In the present invention, a brake device is equipped with: differential pressure control valves; pressure adjusting units which are connected to the differential pressure control valves through liquid passages; and a control device which controls the WC pressure Pwc in wheel cylinders by operating the differential pressure control valves and the pressure adjusting units. When predetermined suppression control permission conditions are satisfied while both the supply pumps of the pressure adjusting units and the differential pressure control valves are in operation, the control device performs self-excited vibration suppression control over the differential pressure control valves, the self-excited vibration suppression control being carried out in such a manner that a valve element separated from a valve seat is caused to abut on the valve seat, and, upon abutting on the valve seat, the valve element is separated from the valve seat.