| 摘要 |
A pre-engagement for a braking pressure modulator for a pressure regulating circuit of an electronic braking system of a vehicle includes a first pneumatic inlet through which a supply pressure is supplied to the pre-engagement unit, a second pneumatic inlet through which a redundancy pressure is supplied to the pre-engagement unit, a first pneumatic output terminal through which the pre-engagement unit is connected to an air quantity augmenting relay valve, and a second pneumatic output terminal through which the pre-engagement unit is connected to a pressure sink. The pre-engagement unit also includes an electrically actuated valve system having a plurality of solenoid valves, including a plurality of interconnected pneumatic terminals, and a plurality of electrical terminals which are connected to output terminals of an electronic control unit. An electric braking command signal transmitter delivers a driver initiated electric brake value setting to an input of the electronic control unit. Under normal conditions, both the supply pressure and the redundancy pressure are delivered at the first pneumatic output terminal to be converted by the air quantity augmenting relay valve to a braking pressure determined by the electric brake value setting. In the case of a failure in the electronic braking system, the redundancy pressure is delivered at the first pneumatic output terminal to be converted by the air quantity augmenting relay valve to the braking pressure.
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