Automatic transmission control apparatus having diagnostic...

Details Automatic transmission control apparatus having diagnostic... Automatic transmission control apparatus having diagnostic...

2007-09-04

2007-09-04

Le, David D. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S906000, C192S003580, C073S168000

Reexamination Certificate

active

11074844

ABSTRACT:
An automatic transmission control apparatus controls a gear position by engaging and disengaging multiple frictional elements. A hydraulic pressure detector detects hydraulic pressure applied to the frictional elements. A failure determiner determines a failure, i.e., a dual-engagement of the frictional elements in accordance with detection signals of the hydraulic pressure detector. The hydraulic pressure detector detects first and second hydraulic pressure applied to the plurality of frictional elements. The second hydraulic pressure is greater than the first hydraulic pressure. The failure determiner determines a failure in accordance with a detection signals of the first and second hydraulic pressure detected by the hydraulic pressure detector.

REFERENCES:
patent: 5643123 (1997-07-01), Jang et al.
patent: 6357289 (2002-03-01), Futawatari
patent: 6375591 (2002-04-01), Wakahara et al.

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