A brake system capable of accurately controlling a braking force includes a first and second brake devices that have different control accuracies, and a brake control device that controls a braking force of the first and second braking devices according to a required braking force. The brake control device has a first control mode in which the braking force of the first brake device is controlled to be smaller than the braking force of the second brake device, and a second control mode in which the braking force of the first brake device is increased rather than the first control mode. The second brake device is controlled so that a sum of the braking force of the first brake device and the braking force of the second brake device matches the required braking force.

This application provides a hydraulic adjustment unit, a brake system, an automobile, and a control method, to individually pressurize any brake pipe in a dual circuit brake pipe, to improve safety of a dual circuit brake system. This application is applicable to an intelligent car, a new energy car, a conventional car, or the like. In embodiments of this application, a second hydraulic chamber provides a braking force for a first group of brake wheel cylinders and through a first brake pipe provided with a first control valve, and provides a braking force for a second group of brake wheel cylinders and through a second brake pipe provided with a second control valve.

A control unit for a brake system of a vehicle. Using a sensor signal, provided by a sensor and is in regard to a distance moved by a driver braking-force transmission component or by a booster force transmission component, the control unit discerns if a movable piston of a master brake cylinder of the brake system is moved by a brake actuating distance equal to a specified, limiting brake actuating distance, and, possibly, to output at least one control signal to a pump control unit of at least one hydraulic pump of the brake system. The pump control unit can be activated by the at least one control signal so that brake fluid may be conveyed from a brake fluid reservoir of the brake system into at least one wheel brake cylinder of the brake system using at least one hydraulic pump controlled by the pump control unit.

A brake device for a motor vehicle with two axles, including at least one axle with an electric traction motor for driving and braking at least one wheel arranged on the axle, where energy can be recovered by means of the traction motor during braking. Each wheel has a wheel brake. A pressure supply is provided in the form of a piston-cylinder unit, which can both build up pressure and reduce pressure. The pressure supply forms part of a pressure supply device, having at least two connections, switchably connected by respective valves, to the brake circuits, an ABS/ESP unit and/or an actuating unit. An open-loop and closed-loop control device controls the at least one electric traction motor and components of the pressure supply device such that a braking deceleration can be set by closed-loop control for each brake circuit and/or each axle, with different braking torques at the respective axles.

A brake system includes a reservoir and a motor-driven master cylinder operable during a backup braking mode by actuation of an electric motor of the master cylinder to generate brake actuating pressure for hydraulically actuating the pair of front wheel brakes and the pair of rear wheel brakes. A power transmission unit is configured for selectively providing pressurized hydraulic fluid to a PTU output for actuating the pair of front wheel brakes and the pair of rear wheel brakes in a normal non-failure braking mode. First and second two-position three-way valves are each hydraulically connected with the master cylinder, the power transmission unit, and a selected pair of the front and rear wheel brakes. Each of the first and second three-way valves selectively controls hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected pair of front and rear wheel brakes.

Provided are a vehicle braking apparatus, a vehicle braking method, and a vehicle braking system, which improve the responsiveness of a braking force of a vehicle. The vehicle braking apparatus includes a braking torque generating mechanism configured to generate a braking torque in a first braking torque imparting portion that imparts a braking torque to a first wheel portion comprising either front or rear wheels of the vehicle and a second braking torque imparting portion that imparts a braking torque in a second wheel portion comprising the other ones of the front and rear wheels. The vehicle braking apparatus further includes a control mechanism configured to output to the braking torque generating mechanism a command for generating the braking force precedentially in the second wheel portion selected according to a condition of a vehicle as a wheel portion in which the braking force should be precedentially generated.

At least one embodiment of the present disclosure provides an electric booster brake apparatus including an electric booster unit, an electronic stability control (ESC) operating unit, and an electric-booster control unit. The electric booster unit has a motor, and a motor piston and a master cylinder and pressurizes the master cylinder by adjusting a displacement of the motor piston. The ESC operating unit includes a pressure sensor measuring pressure in the master cylinder and calculates a required braking pressure. The electric-booster control unit controls the position of the motor piston. The electric-booster control unit includes a feedforward control unit for converting the value of the required braking pressure into a motor piston displacement, and a feedback control unit for calculating a compensation displacement of the motor piston based on a difference between the value of the required braking pressure and the value of the pressure in the master cylinder.

An on-board brake system mounted in an autonomous vehicle comprises a brake unit, a first brake actuator and a second brake actuator for driving the brake unit, and a main ECU for controlling drive of the first and second brake actuators; the second brake actuator is an accumulating actuator; and when an emergency stop switch is depressed, the main ECU operates only the second brake actuator or operates the second brake actuator with precedence over the first brake actuator.

According to at least one embodiment, the present disclosure provides a control method of an electric hydraulic brake including an auxiliary braking system generating a braking force in a vehicle when a main brake system fails, the control method comprising: determining whether the main brake system fails; opening a rear-wheel High pressure Switching Valve (HSV) connecting a rear wheel of the main brake system and a Low Pressure Accumulator (LPA) of the auxiliary braking system when the main brake system is determined to have failed; determining whether a driver intervenes in braking; and controlling the auxiliary brake system to generate a braking force in the vehicle.

An electronic brake for a vehicle and a control method therefor according to an embodiment of the present disclosure are able to stably generate a required braking force by controlling an auxiliary brake device by an auxiliary controller, if a flow path on the auxiliary brake device that connects a main brake device and a wheel brake is unintentionally closed.