초록 ▼

A control for a hydrokinetic torque converter lockup clutch having a clutch plate that cooperates with a torque converter impeller shell to define a control pressure cavity wherein the clutch plate is subjected to the pressure in the torus circuit of the torque converter and wherein an electronicall

A control for a hydrokinetic torque converter lockup clutch having a clutch plate that cooperates with a torque converter impeller shell to define a control pressure cavity wherein the clutch plate is subjected to the pressure in the torus circuit of the torque converter and wherein an electronically controlled valve system is used to modulate the pressure in the control pressure cavity thereby varying the clutch capacity to establish a controlled degree of slip of the clutch so that the actual slip of the clutch may be maintained at a target slip value which is adjusted depending upon the value of input shaft speed data and throttle position data stored in the memory of a microprocessor, the microprocessor being designed to calibrate a desired slip value for each engine torque and turbine speed condition whereby a closed-loop electronic control may be achieved to provide a partial converter bypass during the major portion of the vehicle operating time.

대표청구항 ▼

In a bypass clutch for a hydrokinetic torque converter for an automatic transmission and engine; a clutch member connected to said engine, a converter having a friction surface adapted to cooperate frictionally with said clutch member; a fluid pressure operated means for controlling the clutching ca

In a bypass clutch for a hydrokinetic torque converter for an automatic transmission and engine; a clutch member connected to said engine, a converter having a friction surface adapted to cooperate frictionally with said clutch member; a fluid pressure operated means for controlling the clutching capacity of said bypass clutch whereby clutch slip may be effected for a variety of engine and transmission conditions, electronically operated valve means for controlling the pressure applied to said fluid pressure operated means, said valve means being connected to and being responsive to an electronic processor having control logic that responds to changes in operating conditions of said transmission and engine; said control logic determining a desired slip for each set of values for at least two operating conditions of said transmission; means for determining a target slip for each set of said operating conditions; means for determining the actual slip of said bypass clutch; means for determining the desired slip for said bypass clutch for each operating condition of said transmission; and means for effecting a decay of the actual slip over time by calculating a value for slip that is a function of the difference between the actual slip and the target slip for each set of said operating conditions.