Control method for the engagement of a torque converter clutch

Details Control method for the engagement of a torque converter clutch Control method for the engagement of a torque converter clutch

1992-02-24

1993-02-16

Lorence, Richard

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 331, 192103F, F16H 6114, F16H 4502

Patent

active

051862948

ABSTRACT:
An improved torque converter clutch (TCC) engagement control method utilizing a combination of pressure control and flow control methodologies to ensure consistently smooth and timely TCC engagement. The engagement is initiated with a pressure control methodology in which the duty cycle of a PWM actuator is selected to produce a desired pressure differential across the TCC clutch plate. However, if the flow conditions are such that the pressure control methodology fails to promptly initiate engagement of the TCC, as detected in relation to the speed difference across the torque converter, a flow control methodology is substituted for the pressure control to initiate clutch engagement. In this case, the duty cycle of the actuator is adjusted to a value which provides full or near-full fluid flow. This control is maintained for a predetermined period, or until the speed difference across the torque converter indicates initiation of TCC engagement. At such point, the pressure control methodology is resumed to complete the TCC engagement.

REFERENCES:
patent: 4706790 (1987-11-01), Lockhart et al.
patent: 4724939 (1988-02-01), Lockhart et al.
patent: 4805750 (1989-02-01), Nitz
patent: 4828082 (1989-05-01), Brand et al.

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