Driven-wheel brake controller with traction control

摘要

The driven wheel (13) is braked by working fluid pumped (52) to the brake cylinder (12) from a low-pressure source (14) via a system (34) of blocking valves (18,24,32) and a non-return valve (26). A traction controller (22) switches the system selectively between pressure-boosting and pressure-reducing states to limit the deg. of wheel-slip. A normally-open blocking valve (18) provides pumping supply economy by reducing the pressure for at least part of the time during which the system is not in the pressure-boosting state.