A vehicle brake system, including: a wheel brake device including an actuator including a piston, a working fluid chamber, an electric motor, and a piston moving mechanism; a working-fluid supply device; and a controller configured to execute: a normal brake control to control a hydraulic braking fo
A vehicle brake system, including: a wheel brake device including an actuator including a piston, a working fluid chamber, an electric motor, and a piston moving mechanism; a working-fluid supply device; and a controller configured to execute: a normal brake control to control a hydraulic braking force to a magnitude corresponding to a braking request; and a parking brake control to cause the wheel brake device to be operated as a parking brake, wherein, in the parking brake control, the controller controls the wheel brake device to generate the hydraulic braking force at a start timing of an operation as the parking brake, controls the actuator to perform a lock operation in which the electric motor is operated to move the piston forward in a state in which the hydraulic braking force is generated, and controls the wheel brake device to release the hydraulic braking force after the lock operation.
대표청구항▼
1. A brake system for a vehicle, comprising: a wheel brake device including (a) a rotary member that rotates with a wheel, (b) a friction member configured to be pressed against the rotary member, (c) an actuator including a piston and a working fluid chamber and configured such that the piston is m
1. A brake system for a vehicle, comprising: a wheel brake device including (a) a rotary member that rotates with a wheel, (b) a friction member configured to be pressed against the rotary member, (c) an actuator including a piston and a working fluid chamber and configured such that the piston is moved forward to cause the friction member to be pressed against the rotary member, the wheel brake device being configured to generate a braking force for the wheel;a working-fluid supply device configured to supply a working fluid to the working fluid chamber of the actuator such that a pressure of the working fluid is changeable; anda controller configured to control the brake system,wherein the actuator further includes an electric motor and a piston moving mechanism configured to move the piston based on an operation of the electric motor,wherein the wheel brake device also functions as a parking brake by the operation of the electric motor,wherein the controller is configured to execute: a normal brake control to control a hydraulic braking force to a magnitude corresponding to a braking request, the hydraulic braking force being a braking force that depends on the pressure of the working fluid supplied to the working fluid chamber; anda parking brake control to cause the wheel brake device to be operated as the parking brake, andwherein, in the parking brake control, the controller controls the wheel brake device to generate the hydraulic braking force at a start timing of an operation as the parking brake, controls the actuator to perform a lock operation in which the electric motor is operated to move the piston forward in a state in which the hydraulic braking force is generated, and controls the wheel brake device to release the hydraulic braking force after the lock operation. 2. The brake system according to claim 1, wherein, in the parking brake control, the controller controls the actuator to perform the lock operation after the hydraulic braking force having a set magnitude is maintained for a set length of time. 3. The brake system according to claim 1, wherein, in the parking brake control, the controller prohibits the working fluid from flowing into and out of the working fluid chamber after the hydraulic braking force is generated and controls the actuator to perform the lock operation when the hydraulic braking force is decreased by a set degree. 4. The brake system according to claim 3, wherein, in the parking brake control, the controller controls the actuator to perform the lock operation each time when the hydraulic braking force is decreased by the set degree. 5. The brake system according to claim 3, wherein, in the parking brake control, the controller determines that leakage of the working fluid supplied to the working fluid chamber is occurring when a decrease gradient of the hydraulic braking force is greater than a set gradient. 6. The brake system according to claim 1, wherein, in the parking brake control, the controller controls the actuator to additionally perform the lock operation after the hydraulic braking force is released. 7. The brake system according to claim 1, wherein, in the parking brake control, the controller controls the wheel brake device to generate, at the start timing of the operation as the parking brake, the hydraulic braking force greater than the hydraulic braking force that is being generated in the normal brake control.
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