Automatic transmission control system having electronic shift co

Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine

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477155, 477906, F16H 6112, F16H 5968

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active

054605822

ABSTRACT:
An automatic transmission having multiple-ratio gearing, fluid pressure-operated clutches and brakes adapted to establish and to disestablish multiple torque ratios and electronic shift control solenoids that can be energized and de-energized under the control of an electronic microprocessor that senses transmission operating variables, and a control strategy inherent in the microprocessor that uses predetermined failure modes to perform functional testing on the shift solenoids without special hydraulic and electronic hardware for developing the diagnostic information that detects shift solenoid failures or malfunctions.

REFERENCES:
patent: 4951205 (1990-08-01), Lowe et al.
patent: 5016174 (1991-05-01), Ito et al.
patent: 5048374 (1991-09-01), Miyake et al.
patent: 5113720 (1992-05-01), Asayama et al.
patent: 5129287 (1992-07-01), Asada et al.

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