| 摘要 |
A hydraulic dual-circuit brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles has a four-channel hydraulic unit with control valves and a return pump with two separate pumping elements for each brake circuit. To supply brake pressure in traction control operation, an additional unit is provided having a charging valve for connecting a self-aspirating pumping element of the return pump to the brake fluid tank and a reversing valve disposed in the connection between this pumping element and the master brake cylinder. For a rapid buildup of brake pressure in traction control, given wheel brake cylinders requiring a large brake fluid volume, a reservoir is provided connected to the brake pressure supply circuit by a reservoir connection valve via the reversing valve. Via a check valve between the reservoir and the reservoir connection unit, with a parallel-connected pressure limiting valve, the reservoir is switched off automatically whenever the pressure in the brake pressure supply circuit exceeds the instantaneous reservoir pressure.
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