A brake system for selectively actuating at least one of a pair of front wheel brakes and a pair of rear wheel brakes includes a reservoir and a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating at least a selected one of the wheel brakes during a braking event. The power transmission unit includes an electric motor for selectively actuating a fluid pressurization cycle. The electric motor is a dual-wound electric motor having first and second windings. A first electronic control unit is provided for selectively controlling the first windings of the electric motor of the power transmission unit. A second electronic control unit is provided for selectively controlling the second windings of the electric motor of the power transmission unit. An isolation valve and a dump valve are associated with each wheel brake.

The present disclosure in some embodiments provides a brake apparatus for a vehicle, comprising: a reservoir configured to store a working fluid; a master cylinder connected to the reservoir; a hydraulic circuit connected to a wheel brake; a primary brake unit configured to supply a hydraulic pressure to the wheel brake through the hydraulic circuit; and a secondary brake unit configured to supply a hydraulic pressure to the wheel brake through the hydraulic circuit, wherein the hydraulic circuit comprises: a first hydraulic circuit coupled to the reservoir, the master cylinder, and the secondary brake unit; a second hydraulic circuit coupled to the reservoir and the primary brake unit; and a third hydraulic circuit coupled to the primary brake unit, the secondary brake unit, and the wheel brake.

An electrohydraulic actuator assembly for use in a brake-by-wire hydraulic brake system. The electrohydraulic actuator assembly includes a pair of electrohydraulic actuator EHA units. One EHA unit provides fluid to front brakes and the other EHA unit provides fluid to rear brakes. Each EHA unit includes an electric motor, a reduction gear unit, a pair of magnetorheological clutches, and a pair of fluid pumps. The system further including an ECU that actuates the electric motor and controls engagement of the clutches to cause the fluid pump to pump brake fluid to at least one of the front and rear brakes. The system further includes a regeneration system for providing supplemental electricity to the electric motors.

A method of conducting a diagnostic test to determine leakage within a brake system includes first providing a brake system having a plunger assembly including a housing defining a bore therein. The plunger assembly includes a piston slidably disposed therein such that movement of the piston pressurizes a pressure chamber when the piston is moved in a first direction. The pressure chamber of the plunger assembly is in fluid communication with an output, and wherein the plunger assembly further includes an electrically operated linear actuator for moving the piston within the bore. The linear actuator of the plunger assembly is actuated to provide pressure at the output of the plunger assembly at a first predetermined level. The pressure at the output of the plunger assembly is held for a predetermined length of time. The method further includes determining whether conditional criteria has been met indicating a leakage within the brake system.

The present disclosure relates to an electronic brake system and an operation method thereof. The electronic brake system prepares various valves provided on flow paths, that connect components and a reservoir, in a closed state, and then switches the various valves to an open state after a hydraulic pressure of a pressure medium is formed by a hydraulic supply device.

A vehicle control system for controlling braking in a vehicle may include a braking system operably coupled to one or more wheels of the vehicle to provide brake inputs to the one or more wheels responsive to a torque request generated based on pedal position. The system may further include a pedal position sensor operably coupled to a brake pedal to determine the pedal position responsive to actuation of the brake pedal by a driver of the vehicle, a pedal feel simulator operably coupled to the brake pedal to provide tactile feedback to the driver via a pedal force applied to the brake pedal, an accelerometer for determining a rate of velocity reduction of the vehicle during the actuation of the brake pedal, and a feedback augmenter operably coupled to the pedal feel simulator to provide a pedal force offset to increase the pedal force provided to the brake pedal based on the rate of velocity reduction.

A method for initializing an electronically slip-controllable power braking system after a startup and an electronically slip-controllable power braking system. Power braking systems are equipped with a pressure generator for conveying pressure medium in a pressure medium circuit. The pressure generator includes a plunger unit made up of a plunger cylinder, a plunger piston, and a plunger work chamber enclosed by plunger cylinder and plunger piston. A characteristic, using which an actuation of the plunger piston is carried out by the motor during the initialization of the power braking system, is selected by the electronic control unit as a function of a piece of information present about the position of plunger piston at the start of the initialization and implemented by corresponding electronic activation of the motor.

A brake controller according to the present disclosure that changes an effect correlation value correlating to an effect of braking in a first braking system provided in a vehicle in accordance with a vehicle condition of the vehicle includes a control part generating a braking force by at least one of the first braking system and a second braking system different from the first braking system in a case where the vehicle condition is a first condition based on a braking distribution ratio different from that in a case where the vehicle condition is a second condition and a setting part setting the effect correlation values so as to be different from each other in the case where the vehicle condition is the first condition and in the case where the vehicle condition is the second condition.

A power piston in a power cylinder borehole of a hydraulic block of a hydraulic power unit of a hydraulic power vehicle braking system is only guided radially in an axially delimited guide section. The power cylinder borehole is configured with a larger diameter axially outside the guide section. A brake fluid channel extends through the guide section up to an opening of a brake fluid line.

A vehicle braking system includes a master cylinder. In a delivery line of the master cylinder there is a pressure transfer device, which generates a pressure in a hydraulic actuating line of a respective brake device following a fluid pressure communicated to a first inlet of the pressure transfer device from the delivery line and/or following a fluid pressure supplied to a second inlet of the pressure transfer device from an electrically-operated fluid pressure source. An electronic controller controls an enabling/disabling solenoid valve, and the electrically-operated fluid pressure source to create different operating modes of the system. The system does not include any vacuum-operated servo-assisting devices. The master cylinder is associated with a hydraulic device for adjusting the feeling on the brake pedal, in which a fluid pressure is generated that opposes the brake pedal actuation. The electronic controller controls the pressure in the device for adjustment of the feeling on the pedal.