| 摘要 |
The invention describes a vehicle brake system having a vehicle brake arrangement (10), an electronic control unit (ECU) for controlling a vehicle brake arrangement (10), and an electric machine which can be operated as a motor and as a generator. The electronic control unit (ECU) is designed to control valves (30, 32, 34, 36, 38, 40) of the vehicle brake arrangement (10) and the electric machine in such a way that, when a brake pedal (12) is actuated, hydraulic fluid is supplied to a wheel brake (24a; 24b) from a master cylinder (16) via a feed line (20) in order to generate a brake pressure at the wheel brake (24a; 24b). After a corresponding brake pressure is attained at the wheel brake (24a; 24b), the supply of hydraulic fluid from the master cylinder (16) to the wheel brake (24a; 24b) is shut off, wherein the brake pressure effected by means of hydraulic fluid is gradually dissipated, and, to a corresponding degree and simultaneously, the electric machine is operated as a generator to an increasing extent. In the event of an increase of driver braking demand, hydraulic fluid is additionally supplied from the master cylinder (16) to the wheel brake (24a; 24b), and with decreasing vehicle speed, the electric machine is operated as a generator to a decreasing extent, and, to a corresponding degree and simultaneously, hydraulic fluid is supplied to the wheel brake (24a′ 24b) from an intermediate accumulator (26) and/or from the master cylinder (16). |
