Hydraulic supply system for torque converter impeller clutch

摘要

A hydraulic system for supplying fluid to a torque converter of an automatic transmission for a vehicle driven by a power source includes a torque converter including an impeller, a turbine, and an impeller clutch for alternately engaging and disengaging a drive connection between the impeller and the power source, a hydraulic control system producing line pressure and converter charge pressure that communicates with the impeller clutch, a discharge line communicating with the impeller clutch and through which hydraulic fluid discharges from the torque converter at a discharge pressure similar to the first pressure, thereby minimizing a pressure differential across the impeller clutch tending to disengage the impeller clutch, and an oil cooler to which fluid is supplied from at least one of the source of line pressure and the converter discharge line and from which fluid returns to the control system.

主权项

1. A system for controlling a torque converter, comprising:
an impeller clutch; a circuit carrying fluid through a cooler and a lube circuit; a control system using fluid supplied to the control system from the circuit to produce charge pressure, and changing a differential between charge pressure and a discharge pressure across the impeller clutch by changing fluid flow in a discharge line carrying fluid from the impeller clutch to the control system.