System and method for preventing overheat of torque converter

Details System and method for preventing overheat of torque converter System and method for preventing overheat of torque converter

1999-10-07

2000-11-14

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

477 76, 477 61, 477168, F16H 5972, F16H 6114

Patent

active

061463094

ABSTRACT:
A torque converter automatic transmission of a motor vehicle is equipped with an overheat prevention system of the torque converter. The system comprises a first unit which detects the temperature of a hydraulic fluid in an oil pan of the transmission; a second unit which detects whether the engine is under high load condition or low load condition; a third unit which derives an overheat judging reference temperature in accordance with the detection of the second unit, the overheat judging reference temperature indicating a first reference temperature upon detection of the high load condition of the engine by the second unit and indicating a second reference temperature upon detection of the low load condition of the engine by the second unit, the first reference temperature being lower than the second reference temperature; and a fourth unit which carries out a given operation to lower the temperature of the torque converter when the temperature of the hydraulic fluid in the oil pan exceeds the overheat judging reference temperature.

REFERENCES:
patent: 4733581 (1988-03-01), Hasegawa et al.
patent: 5050717 (1991-09-01), Shibayama
patent: 5556349 (1996-09-01), Ishii et al.
patent: 5609552 (1997-03-01), Furuya et al.
patent: 6019703 (2000-02-01), Black et al.

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