Twin-circuit hydraulic car breaking system - corrects car wheel slip by pressure on driven wheels from independently pumped changeover valve and spring-loaded plunger

摘要

In a diagonal brake system with ABS and ASR, a four duct hydraulic unit (20) incorporates electronically controlled valves (31-34) and a return pump (35) with two separate sections (36,37) serving the respective two brake circuits (29,30). In ASR mode, one section (36) draws fluid through a charging valve (45) to build-up pressure via change-over and limiting valves (46,47), while the plunger (48) generates an approximately equal pressure in the circuit contg. the other section (37). ADVANTAGE - Any fault is confined to one circuit so that the vehicle can be driven safely with caution.