Patent ID: 6158216
Filing Date: 2000-12-12
Classification: B62D,F01P,Y10S

Abstract:
A control system for first and second hydraulic devices in a vehicle which contains a hydraulic pump, comprising:a) a first valve for receiving fluid from the pump, and delivering flow at a rate controlled by a control signal;b) a second valve for allocating said flow between said devices, based on predetermined operating conditions of the first valve:wherein the second valve comprises:i) a first port which senses input pressure of the first hydraulic device;ii) a second port which senses pressure at an output of the pump; andiii) a pintle which diverts flow from the first hydraulic device to the second hydraulic device, when pressures in the first and second ports reach a predetermined difference; andwherein said first and second valves cooperate to cause said first and second hydraulic devices to be off when an output from a pump is low and a cooling demand is zero.