Method for operating a brake system of a motor vehicle having a hydraulic service brake device with hydraulically actuated wheel brakes on at least one front axle of the motor vehicle, and a parking brake device with wheel brakes, which can be actuated in each case by an electromechanical actuator, on a rear axle of the motor vehicle, wherein a motor vehicle actual longitudinal deceleration is measured, wherein during a braking operation by the hydraulic service brake device a braking operation is carried out by the parking brake device while the motor vehicle is traveling, wherein a motor vehicle setpoint longitudinal deceleration which is to be achieved is determined, and the electromechanical actuators of the parking brake device are actuated in such a way that the motor vehicle actual longitudinal deceleration is adjusted to the motor vehicle setpoint longitudinal deceleration.

A brake system for a vehicle, including: a brake operation member; a hydraulic brake device configured to give a braking force based on an operation of the brake operation member; an electric brake device configured to give a braking force generated by an electric actuator; a regenerative brake device configured to give a braking force utilizing electric power generation by rotation of a wheel, and a controller configured to determine insufficient braking force by excluding the braking force by the hydraulic brake device from a required overall braking force required for the vehicle as a whole and to control the braking force by each of the electric brake device and the regenerative brake device based on the insufficient braking force, wherein the brake system is configured such that the hydraulic brake device gives the braking force when the required overall braking force exceeds a threshold.

A brake system for a motor vehicle includes separate first and second brake circuits associated to first and second vehicle axles, respectively, and rigidly connected to each other. Hydraulic brake pressure is supplied by a first brake piston of a master cylinder to the first brake circuit and by a second brake piston to the second brake circuit. Operably connected to the first vehicle axle is an electric motor and operates as a recuperator, with a blending device withdrawing hydraulic fluid from the first brake circuit during a recuperation phase of the electric motor. A partition wall between the first and second brake pistons subdivides the master cylinder into a first pressure chamber associated to the first brake piston, and a separate second pressure associated to the second brake piston. A connectable and disconnectable floating piston enables a hydraulic communication between the first and second brake circuits with one another.

Methods and apparatus to control vehicle braking systems are described herein. An example apparatus a first brake boost unit to control a first brake fluid pressure of a first brake system associated with front wheels of a vehicle, and a second brake boost unit to control a second brake fluid pressure of a second brake system associated with rear wheels of the vehicle.

A brake system for a motor vehicle has at least a first wheel brake and at least a second wheel brake. A first inlet valve is fluidically connected, on the one hand, to the first wheel brake, and, on the other hand, to a brake pressure source, and a second inlet valve is fluidically connected, on the one hand, to the second wheel brake, and, on the other hand, to the brake pressure source. In this case, a switching valve is provided, which fluidically connects the one fluid outlet of the second inlet valve in a first switching position to the second wheel brake and in a second switching position to the first wheel brake.

Brake fluid inside a first wheel cylinder is pressurized by using a first pressure-regulating mechanism and brake fluid inside a second wheel cylinder is pressurized by using a second pressure-regulating mechanism. If a determination means determines that the first pressure-regulating mechanism action is in an unsuitable state and the second pressure-regulating mechanism action is in a suitable state, the control means pressurizes the brake fluid inside the first wheel cylinder by using a master cylinder and pressurizes the brake fluid inside the second wheel cylinder by using the second pressure-regulating mechanism, when an operation volume is less than a value. When the operation volume has reached the value, the control means pressurizes the brake fluid inside the first and second wheel cylinders by using the second pressure-regulating mechanism.

The present invention comprises: a first pressure-regulating mechanism that pressurizes a first wheel cylinder on either the left or right front wheel side of a vehicle, by using the movement of a first control piston driven by a first electric motor; a second pressure-regulating mechanism that pressurizes a second wheel cylinder on the other side, out of the left and right front wheels, by using the movement of a second control piston driven by a second electric motor; an opening/closing means interposed in a connection fluid path that connects the first wheel cylinder and the second wheel cylinder; and a control means. If the operation amount for a braking operation member is less than a prescribed value, the control means puts the opening/closing means in a connected state, puts the first electric motor in an electricity-supplied state, and puts the second electric motor in a non-electricity-supplied state.

A rear wheel regenerative braking control system for vehicle, may include a brake controller; a vehicle controller; a hydraulic controller; and a motor controller, wherein the system and the method may maximize an amount of rear wheel regenerative braking while easily securing braking stability of a vehicle.

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.

A brake system for a vehicle having a master brake cylinder, which provides a pressure signal, having a brake-medium reservoir connected to the master brake cylinder, and a first brake circuit, which is coupled by a first input to the master brake cylinder and by a second input to the brake-medium reservoir, and having at least one first wheel-brake cylinder, which is mounted at a first wheel, in order to exert a force corresponding to the pressure signal onto the first wheel, and having a separator valve, which is configured between the first input and the first wheel-brake cylinder, to prevent further transmission of the pressure signal upon receipt of a supplied closing signal; and having a control valve, which is configured between the first input and the first wheel-brake cylinder; in order to control an inflow of a brake medium from brake-medium reservoir to the first wheel-brake cylinder. In addition, a method for controlling a corresponding brake system is also described.