Method and system for controlling automatic transmission

Details Method and system for controlling automatic transmission Method and system for controlling automatic transmission

1995-12-18

1999-01-05

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

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

477906, 477159, F16H 6112

Patent

active

058555323

ABSTRACT:
An automatic transmission control system is capable of quickly and accurately judging the normal state and faulty state of an input shaft rotation speed sensor and/or an output shaft rotation speed sensor. The system includes an input shaft rotation speed sensor condition judging device for judging whether an input shaft rotation speed sensor detecting a rotation speed NI of an input shaft of the automatic transmission is in a normal or faulty state, an output shaft rotation speed sensor condition judging device for judging whether an output shaft rotation speed sensor detecting a rotation speed No of an output shaft of the automatic transmission is in a normal or faulty state, a multiplying means for multiplying the rotation speed No of the output shaft with a current transmission gear ratio, and comparing and judging means for judging whether the multiplied value is coincident with the rotation speed NI of the input shaft. On the basis of those judgements, the output shaft rotation speed sensor is judged whether it is in the normal state or not by the output shaft rotation speed sensor condition judging device.

REFERENCES:
patent: 4849899 (1989-07-01), Cote et al.
patent: 4896569 (1990-01-01), Ito et al.
patent: 4918606 (1990-04-01), Ito et al.
patent: 5033328 (1991-07-01), Shimanaka
patent: 5439426 (1995-08-01), Nakashima

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