The invention relates to a pressure-volume delivery system comprising a piston-cylinder unit with a piston acting on both sides (dual-action reciprocating piston), said piston having at least two different active surfaces in corresponding pressure chambers and the pressure chambers being connected to at least one consumer via hydraulic lines. The delivery system also comprises a drive for the piston-cylinder unit. According to the invention, the pressure chambers and/or hydraulic lines are interconnected by means of at least one or more switching valves connected in parallel and having a large flow cross-section (AV) and via a short hydraulic line or lines with low flow resistance.

Front and rear wheel required braking forces are calculated so that a braking force required as a whole of the vehicle matches the sum of the front and rear wheel required braking forces, and a ratio of the rear wheel required braking force to the front wheel required braking force is constant. When the front and rear wheel required braking forces are equal to or less than the maximum front and rear wheel regenerative braking forces, the front and rear wheel required braking forces are achieved only by the front and rear wheel regenerative braking forces. When the front and rear wheel required braking forces are larger than the maximum front and rear wheel regenerative braking forces, the front and rear wheel required braking forces are achieved by the front and rear wheel regenerative braking forces and the front and rear wheel frictional braking forces.

A brake system for a vehicle, may include a brake input device to apply a brake input of a driver; a brake actuator generating braking hydraulic pressure; wheel cylinders generating braking force for each vehicle wheel by the braking hydraulic pressure generated by the brake actuator; and a hydraulic pressure supply line connecting the brake actuator and the wheel cylinders, wherein the brake actuator includes a main pump device by which braking force is applied, and a sub control device configured for adjusting the braking force applied by the main pump device.

The invention relates to a method for controlling a braking system for setting a total braking torque distribution between a first and a second axle of a motor vehicle. The braking system includes a friction braking device and a recuperative braking device. The braking system has a total braking torque composed of a friction braking torque portion and a recuperative braking torque portion. The method include determining, for one axle, a minimal recuperation torque, which is set on that axle, and remains set on that axle for all driving situations as a recuperative braking torque portion.

A brake system including: (a) a pair of electric brake devices respectively for right and left wheels; (b) a pair of individual controllers respectively associated with the electric brake devices; (c) a central controller communicable with the individual controllers; and (d) an on-vehicle network to which the central and individual controllers are connected, wherein the central controller transmits, via the on-vehicle network, control commands to the individual controllers as signals containing destination information of the respective individual controllers, wherein each individual controller controls an associated one of the electric brake devices according to the control command based on the signal containing the destination information of its own, and wherein the brake system further includes a position-change determining device configured to determine, based on a turning behavior of a vehicle, that positions of the individual controllers are mutually changed with respect to the association with the electric brake devices.

An electric-brake controller includes an antilock controller configured to control a pressing force of an electric brake. The electric brake includes a pressing member that is advanced by rotation of an electric motor in a forward direction to press a friction member against a brake rotation member. The electric brake includes a return spring that applies a spring force such that the pressing member is moved away from the brake rotation member. The antilock controller includes a pressing-force reducer that reduces the pressing force. The pressing-force reducer includes: a reverse-rotation-current supplier that supplies reverse-rotation current for rotating the electric motor in a reverse direction for a reverse-rotation-current supply time; and a forward-rotation-current supplier that supplies forward-rotation current, for rotating the electric motor in the forward direction, to the electric motor after the reverse-rotation current is supplied for the reverse-rotation-current supply time.

Systems and methods for a braking a vehicle. In one example, the braking system includes a friction braking system, a regenerative braking system, and an electronic processor. The electronic processor is communicatively coupled to the friction braking system and the regenerative braking system. The electronic processor is configured to receive a driver brake request and determine a brake failure state. The brake failure state indicates a brake failure. In response to determining the brake failure state, the electronic processor applies a braking force based on the driver brake request. The braking force includes a frictional braking force generated by the friction braking system and a regenerative braking force generated by the regenerative braking system.

Methods and systems are provided for operating a hybrid vehicle during operating conditions where vehicle braking is requested. In one example, regenerative braking is allocated to vehicle axles responsive to wheel torques of respective vehicle axles in response to an anti-lock braking system being activated. Additionally, friction braking torque is allocated to vehicle axles responsive to the anti-lock braking system being activated.

A brake control device adjusts a front wheel braking hydraulic pressure of front wheel cylinders 71, 72 provided on front wheels of a vehicle and a rear wheel braking hydraulic pressure of rear wheel cylinders 73, 74 provided on rear wheels of the vehicle. The brake control device includes a hydraulic pressure generating unit 1A configured to adjust a hydraulic pressure generated by an electric motor 11 to an adjusted hydraulic pressure and apply the adjusted hydraulic pressure as the rear wheel braking hydraulic pressure and a hydraulic pressure correcting unit 1B configured to adjust to decrease the adjusted hydraulic pressure to be a corrected hydraulic pressure, and apply the corrected hydraulic pressure as the front wheel braking hydraulic pressure.

A hydraulic brake system for a vehicle, including: a wheel brake device configured to generate a braking force based on a pressure of a working fluid; a first brake system including a high-pressure source device including an accumulator and a first pump device that is driven intermittently such that a pressure of the working fluid in the accumulator is not lower than a set lower limit pressure and not higher than a set upper limit pressure; a second brake system including a second pump device; and a main power source that supplies electricity to the first and second brake systems, wherein the hydraulic brake system includes an auxiliary power source that supplies electricity to the first brake system when a failure occurs in the main power source, and wherein the first pump device is continuously driven when the failure occurs irrespective of the pressure in the accumulator.