An electronic brake system may be capable of performing braking operation according to a pedal effort of a driver even when the brake system operates abnormally as well as simplifying a configuration thereof by minimizing the number of valves for controlling a flow of oil pressure and precisely controlling pressure therein.

An ESC 33 increases distribution of a braking force to rear wheels according to a reduction in a speed of a vehicle due to braking, and distributes the braking force so as to allow the vehicle to be kept stopped due to braking forces applied to the rear wheels when the vehicle stopped. Then, a second ECU holds the braking force by driving a parking mechanism with the vehicle kept stopped due to the braking forces applied to the rear wheels.

A vehicle braking device includes: a first hydraulic pressure generation unit that is connected to a first wheel cylinder via a first fluid passage, and generates a hydraulic pressure in the first wheel cylinder; a second hydraulic pressure generation unit that is connected to a second wheel cylinder via a second fluid passage, and generates a hydraulic pressure in the second wheel cylinder; a first power supply unit that supplies electric power to the first hydraulic pressure generation unit; a second power supply unit that supplies electric power to the second hydraulic pressure generation unit; and a normally open communication passage opening and closing unit that is provided in a communication passage connecting the first fluid passage and the second fluid passage, and opens and closes the communication passage.

To avoid an exceedance of a permissible maximum pressure in a hydraulic vehicle power braking system including anti-slip regulation, continuous valves are to be utilized as inlet valves of wheel brakes of the vehicle braking system, and the inlet valve of a wheel brake, whose outlet valve will be opened or is open in order to regulate the wheel brake pressure, is to be partially closed, so that this inlet valve acts as a throttle and limits a brake pressure in the vehicle braking system.

A brake system for actuating front and rear wheel brakes includes a reservoir and a master cylinder operable by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at a first output for hydraulically actuating the front wheel brakes. A power transmission unit is configured for selectively providing pressurized hydraulic fluid for actuating the front wheel brakes. A pair of rear brake motors selectively electrically actuate respective rear wheel brakes. An electronic control unit controls at least one of the power transmission unit and the rear brake motors. A two-position three-way valve is hydraulically connected with the master cylinder and the power transmission unit and with the front wheel brakes. The three-way valve selectively controls hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to at least one of the front wheel brakes.

A braking system for a vehicle, which includes a control system configured to: actuate a pressure generation device in accordance with a braking request signal to generate the brake pressure; ascertain an operational state of the pressure generation device; ascertain a position of a displacement piston of a brake master cylinder based on the braking request signal; and couple a pressure modulation device to a brake master cylinder volume and actuate the device so that the pressure modulation device conveys brake fluid out of the brake master cylinder volume into the wheel brake circuit, if the operational status of the pressure generation device is ascertained to be nonoperational and the displacement piston is in the idle position.

The present disclosure relates to a valve block for a hydraulic brake system. The valve block for a hydraulic brake system includes a first valve row in which NO valve receiving bores to receive a plurality of NO valves are disposed, a second valve row in which NC valve receiving bores to receive a plurality of NC valves are disposed, a pair of pump receiving bores formed symmetrically to each other on opposite side surfaces to be disposed between the first and second valve rows and receiving a piston pump, a pair of first damping bores formed symmetrically to each other on the opposite side surfaces to be disposed above the first valve row and receiving a first pressure pulsation reducing device, a pair of second damping bores formed symmetrically to each other on an upper surface to be disposed above the first damping bores and receiving a second pressure pulsation reducing device, a pair of low pressure accumulator receiving bores formed symmetrically to each other on a lower surface, and a pressure sensor receiving bore formed on a front surface to be disposed adjacent to the pair of low pressure accumulator receiving bores.

A housing of brake device includes a first oil path, a second oil path that is adjacent to the first oil path in a first direction along an axial direction of the first oil path and has a larger cross-section orthogonal to the axial direction than the first oil path, a third oil path connected to the first oil path, and a fourth oil path connected to the second oil path. A throttle member of the brake device is anchored to the housing by being press-fitted into the first oil path. The third oil path connects the fourth oil path through the throttle. When the throttle member moves in the first direction by releasing the press-fitting, the third oil path connects the fourth oil path through a gap between an inner circumferential surface forming the second oil path and an outer circumferential surface of the throttle member.

A housing of brake device includes a first oil path, a second oil path that is adjacent to the first oil path in a first direction along an axial direction of the first oil path and has a larger cross-section orthogonal to the axial direction than the first oil path, a third oil path connected to the first oil path, and a fourth oil path connected to the second oil path. A throttle member of the brake device is anchored to the housing by being press-fitted into the first oil path. The third oil path connects the fourth oil path through the throttle. When the throttle member moves in the first direction by releasing the press-fitting, the third oil path connects the fourth oil path through a gap between an inner circumferential surface forming the second oil path and an outer circumferential surface of the throttle member.

A hydraulic brake system for a vehicle includes a master brake cylinder, a hydraulic unit, and multiple wheel brakes. The hydraulic unit Ha at least one brake circuit for modulating the braking pressure in the wheel brakes. At least one wheel brake is paired with a bistable solenoid valve, which is looped into the corresponding fluid channel directly upstream of the paired wheel brake and which enables the braking pressure in the paired wheel brake to be modulated in a de-energized open position and locks the current braking pressure in the paired wheel brake in a de-energized closed position, wherein a volume equalization device which comprises a connectable accumulator opens into the corresponding fluid channel between the bistable solenoid valve and the paired wheel brake.