Apparatus for controlling a power-assisted steering gear in response to vehicle conditions

摘要

An apparatus (10) for helping to turn steerable wheels (12) of a vehicle comprises a hydraulic power-assisted steering gear (16) having an open center control valve (44). A variable displacement pump (110) supplies the steering gear (16) with hydraulic fluid. A controller (104) controls the pump (84). The controller (104) sends a control signal to the pump (110) to control the displacement of the pump (110).