Automatic transmission lockup clutch control apparatus

Details Automatic transmission lockup clutch control apparatus Automatic transmission lockup clutch control apparatus

1995-11-22

1998-05-19

Wright, Dirk

Interrelated power delivery controls, including engine control

Clutch control

With fluid drive

F16H 6114

Patent

active

057528950

ABSTRACT:
An apparatus for controlling a lockup clutch provided in an automatic transmission having an impeller and a turbine. The pressure of the oil supplied to the lockup clutch is controlled by a lockup solenoid which is operable on a control signal having a variable duty cycle to operate the lockup clutch in a complete lockup mode to complete a mechanical connection between the turbine and the impeller and a released lockup mode to provide a hydrodynamic driving connection between the turbine and the impeller. In the presence of a command for a change of operation of the lockup clutch from its released lockup mode to its complete lockup mode, the initial value of the duty cycle of the control signal is set, based on at least one of conditions including the temperature of the oil, the engine load and the degree of slip permitted between the turbine and the impeller, at a value closer to the duty cycle set for the complete lockup mode of operation of the lockup clutch when the oil is in a condition causing a slow response to the duty cycle control.

REFERENCES:
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4947734 (1990-08-01), Fijita et al.
patent: 4998449 (1991-03-01), Baba et al.
patent: 5024125 (1991-06-01), Baba

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