Skid control system including a relay compensator valve for rapid brake pressure re-application followed by slower rate of pressure re-application

摘要

A skid control system is provided including a relay compensator valve for cycling brake pressure, with the brake pressure rise curve being characterized by a rapid first stage rise rate and a substantially slower second stage rise rate. The valve includes a flow passage interconnecting an outlet pressure chamber and a compensating pressure chamber, the flow passage including a flow restriction. A pressure modulating valve is disposed in the flow passage and is operable to fluidly bypass the flow restriction in response to a predetermined pressure differential between the outlet chamber and the compensating chamber. Thus, the compensator pressure is never more than the predetermined pressure differential below the brake pressure to ensure that brake pressure rises to very nearly ideal brake pressure before the start of restriction of the brake pressure buildup, after the first brake application.