MINIMAL LINE PRESSURE DISTURBANCE PUMP SWITCHING VALVE

摘要

A variable force solenoid valve and a switching valve provide minimal line pressure disturbance of output of an engine driving balance type hydraulic pump when a full-flow mode and a half-flow mode inside an automatic transmission are switched. The variable force solenoid receives a signal from the other electronic controller such as a transmission control module (TCM) or an engine control module (ECM) and provides controlled and pressed hydraulic pressure fluid (transmission oil) to a controllable binary switching or control valve. The controllable binary switching or control valve provides a flow of the fluid from an output port of the hydraulic pump at a first position to a line pressure regulator, enables a portion of the flow to be returned from one output port to an input port in order to control the pressure and the flow to be reduced to satisfy requirements of the transmission between the first position and a second position, and enables the entire flow to be returned from one among the output port of the pump to the introduction or input port, again.