Device and method of fail-safe control for electronically contro

Details Device and method of fail-safe control for electronically contro Device and method of fail-safe control for electronically contro

1988-12-09

1990-04-10

Wright, Dirk

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

74878, B60K 4118

Patent

active

049149822

ABSTRACT:
In a fail-safe control device for an electronically controlled automatic transmission to be mounted on a vehicle, the oil temperature in the transmission is detected by an oil temperature sensor provided for the transmission, and if the oil temperature in the transmission exceeds an allowable level with the lockup operation always prohibited, the gear shift to the maximum gear stage is prohibited.
As a result of this, slippage generated in the torque converter can be reduced and the oil temperature in the T/M can be lowered so that a fail-safe control can be performed.

REFERENCES:
patent: 2353840 (1944-07-01), McKechnie
patent: 2457692 (1948-12-01), La Brie
patent: 3748929 (1973-07-01), Green
patent: 3895541 (1975-07-01), Nohira et al.
patent: 4208929 (1980-06-01), Heino

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