ELECTRO-HYDRAULIC BRAKE SYSTEM

摘要

An electro-hydraulic brake system (30) comprising: a master cylinder (32); a pump (34) the output being communicated to a pressure regulating valve (50), a motor (36) for rotating the pump; an isolation valve (42) for selectively connecting one of the master cylinder and pump to a brake cylinder(s) (44) and a signal generator (40) to activate the pump. The pressure regulating valve connected between the master cylinder and pump to regulate pump output pressure at a determinable level in proportion to the pressure generated by the master cylinder and for providing a path to drain the brake cylinder(s) to a reservoir during intervals of decreasing master cylinder pressure. The system may also include an excess flow valve(s) (90) to prevent the reservoir from being drained by the pump in the event of a malfunction in the system. Various embodiments of the regulating valve are described which add additional failure mode protection.