HYDRAULIC CONTROL FOR ENGINE START STOP TRANSMISSION SYSTEM

摘要

A hydraulic control system for a clutch of a transmission having a plurality of torque transmitting mechanisms and includes a source of pressurized hydraulic fluid, a clutch pressure regulating valve, a clutch pump valve, a first and a second fluid flow check valve, a pressure valve, a first torque transmitting mechanism actuation device, and a pressure control solenoid.

主权项

1. A hydraulic control system for a multi-speed transmission having a plurality of torque transmitting mechanisms, the hydraulic control system including:
a source of pressurized hydraulic fluid; a clutch pressure regulating valve having an input and output port and a valve spool, and wherein the input port is in fluid communication with the source of pressurized hydraulic fluid and the valve spool is actuatable to allow communication between the input and output ports; a clutch pump valve having a first, second, third, and fourth input port, a first and second output port, and a valve spool, and wherein the first input port is in fluid communication with the output port of the clutch pressure regulating valve, the second input port is in fluid communication with the first output port, and the third input port is in communication with a sump of the transmission; a first and a second fluid flow check valves, and wherein the first fluid flow check valve is in communication with both the first output port of the clutch pump valve and the second input port of the clutch pump valve thus preventing backpressure from the second input port to the first output port, and the second fluid flow check valve is in communication with the third input port of the clutch pump valve and the sump thus preventing backpressure from the third input port to the sump; a pressure valve having a first, a second, and a third port, and wherein the first port is in communication with the source of pressurized hydraulic fluid, the second port is in communication with the fourth input port of the clutch pump valve, the third port is in communication with the sump, and the second port is selectively in communication with one of the first port and the third port; a hydraulic device in communication with one of the first and second output ports of the clutch pump valve; and a pressure control solenoid arranged to actuate the valve spool of the clutch pressure regulating valve, and wherein the valve spool of the clutch pump valve is selectively actuatable by the pressure control solenoid.