Braking force modulator for hydraulic vehicle brakes

摘要

The modulator comprises a piston pump unit having spring-biased inlet and outlet valves which normally are held open by return springs, and electromagnetic devices which during actuation close the inlet and outlet valves thereby conditioning the device to act as a piston pump. The valves constitute two mutually independent units which are operable separately by means of individual electromagnetic devices. - The valves are two-step and comprises a primary having a small through-flow area and having its seat provided in a secondary having a considerably larger through-flow area. The electromagnetic devices and the primary valves are placed on the same side of the seat of the secondary valve in the insert. The modulator is controlled by a sensor system.