Patent ID: 7244002
Filing Date: 2007-07-17
Classification: B60T

Abstract:
1. A vehicle brake system comprising: a first motion means having a first motion element which moves according to a driver's brake manipulation, the first motion means outputting a brake hydraulic pressure according to a depressing force of the first motion element; a wheel brake unit through which a braking force is generated at wheels; a brake hydraulic pressure output circuit connecting the first motion means and the wheel brake unit; a shutoff valve disposed in the brake hydraulic circuit, the shutoff valve shutting off a fluid communication between the first motion means and the wheel brake unit; a hydraulic source different from the first motion means, the hydraulic source being connected to the brake hydraulic pressure output circuit between the shutoff valve and the wheel brake unit; a hydraulic pressure controlling means for producing a unit hydraulic pressure in the brake hydraulic pressure output circuit between the shutoff valve and the wheel brake unit by controlling a hydraulic pressure of the hydraulic source different from the first motion means according to the brake hydraulic pressure of the first motion means when the shutoff valve is closed; a stroke simulator being shut off from the first motion means when the first motion element moves from a normal position, the stroke simulator being communicated with the first motion means so as to generate a stroke of the driver's brake manipulation when the shutoff valve is closed and the first motion element is positioned at the normal position; a stroke simulator shutoff/communication detecting means detecting whether the stroke simulator is in shutoff state or communicating state when the shutoff valve is closed; and a stroke-simulator state controlling means returning the first motion element to the normal position using the hydraulic pressure of the hydraulic source by temporally opening the shutoff valve when the shutoff valve is closed and the stroke simulator is put in shutoff state, the stroke-simulator state controlling means closing the shutoff valve when the stroke simulator is put in communicating state due to the returning of the first motion element to the normal position.