The present disclosure relates to a brake device for a vehicle, and a main object of the present disclosure is to provide a brake device for a vehicle which can stably perform an electric parking braking cooperative control process for dynamic parking braking in a state in which the brake device enters a backup mode due to an abnormality or a malfunction generated in a device related to an electric booster in a vehicle equipped the electric booster. In order to achieve the above object, a brake device including a fallback valve which is provided on a hydraulic pressure supply line connected to a wheel brake of a wheel on which an electronic parking brake is installed, and which is configured to selectively shut off brake liquid pressure supplied to the wheel brake, and a method for controlling the same are disclosed.

Left front electric brake mechanisms apply a braking force to a left front wheel by actuating an “electric motor of a first left front electric brake mechanism” and an “electric motor of a second left front electric brake mechanism” controllable independently of each other. A first ECU (a control portion) acquires a target thrust force instruction value to be generated on the left front electric brake mechanisms based on a target braking force to be applied to the left front wheel. The first ECU (the control portion) outputs a first control instruction for actuating the electric motor of the first left front electric brake mechanism and a second control instruction for actuating the electric motor of the first left front electric brake mechanism according to a change amount of the target thrust force instruction value.

Left front electric brake mechanisms apply a braking force to a left front wheel by actuating an “electric motor of a first left front electric brake mechanism” and an “electric motor of a second left front electric brake mechanism” controllable independently of each other. A first ECU (a control portion) acquires a target thrust force instruction value to be generated on the left front electric brake mechanisms based on a target braking force to be applied to the left front wheel. The first ECU (the control portion) outputs a first control instruction for actuating the electric motor of the first left front electric brake mechanism and a second control instruction for actuating the electric motor of the first left front electric brake mechanism according to a change amount of the target thrust force instruction value.

A brake control unit (50) is provided to drive a brake actuator. The brake control unit comprises a primary control branch (510) with a primary inverter (512) and a primary EMI-filter (517) and a secondary control branch (520) with a secondary inverter (522) and a secondary EMI-filter (527). The primary control branch is configured to provide drive signals (D.sub.10) to the brake actuator in a normal operational mode. The secondary control branch (510) is configured to provide drive signals to the brake actuator in the at least a second operational mode. During the first, normal operational mode, both the primary EMI-filter and the secondary EMI-filter are coupled with their input to the power source. Therewith an improved reduction of conducted electromagnetic interference is achieved.

A logic control system for magnetic track braking of a rail transit vehicle includes a magnetic track braking control circuit, a magnetic track braking power supply execution circuit, and a magnetic track braking status monitoring and feedback circuit. The magnetic track braking control circuit includes a pneumatic actuator relay, an electromagnet relay, a system protection relay, a power-on delay relay, a power-off delay relay, an automatic control branch circuit, and a manual control branch circuit. The pneumatic actuator relay is connected to the power-on delay relay, and the system protection relay is connected to the power-off delay relay. The automatic control branch circuit includes a first isolation magnetic track braking switch and an emergency braking relay contact. The manual control branch circuit includes a first circuit breaker, a cab signal option switch, a second isolation magnetic track braking switch and a manual touch button.

A braking system for a motor vehicle has a first and a second parking brake A first and a second control device each have a driver for driving at least the first and/or the second parking brake actuator. The first control device has a first arbitration unit to data whether a parking brake action should be carried out. The second control device has a second arbitration unit to receive parking brake request data and to ascertain from the received data whether a parking brake action should be carried out. The result of the second arbitration unit is fed to the first arbitration unit as parking brake request data and the result of the first arbitration unit is transmitted to the driver of the first and/or second control device for driving the first and second parking brake actuators.

A braking system for a motor vehicle has a first and a second parking brake A first and a second control device each have a driver for driving at least the first and/or the second parking brake actuator. The first control device has a first arbitration unit to data whether a parking brake action should be carried out. The second control device has a second arbitration unit to receive parking brake request data and to ascertain from the received data whether a parking brake action should be carried out. The result of the second arbitration unit is fed to the first arbitration unit as parking brake request data and the result of the first arbitration unit is transmitted to the driver of the first and/or second control device for driving the first and second parking brake actuators.

Provided is a parking brake control device configured to, when releasing a hold on a braking force, energize an electric motor, and change a drive time of the electric motor in accordance with a current change amount in a predetermined interval after a predetermined time has elapsed since a current value of the electric motor starts to decrease after increasing and a current value at which the current change amount of the electric motor converges to a predetermined value or less.

Provided is a parking brake control device configured to, when releasing a hold on a braking force, energize an electric motor, and change a drive time of the electric motor in accordance with a current change amount in a predetermined interval after a predetermined time has elapsed since a current value of the electric motor starts to decrease after increasing and a current value at which the current change amount of the electric motor converges to a predetermined value or less.

An electronic parking brake system including: an electronic parking brake including a pair of brake pads disposed on both sides of a brake disc rotating with a rear wheel of a vehicle, a piston provided to press the pair of brake pads, a nut member provided to press the piston, a spindle member provided to move the nut member, and a motor configured to rotate the spindle member; and a controller electrically connected to the motor and configured to perform a parking operation for the EPB, wherein the controller is configured to detect an inrush current flowing through the motor during the parking operation, and identify a low voltage fault based on the detected inrush current.