Gear decision system for automatic transmission

Details Gear decision system for automatic transmission Gear decision system for automatic transmission

1995-12-29

1997-06-10

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

477107, B60K 4106

Patent

active

056370547

ABSTRACT:
A gear decision system for an automatic transmission which compulsorily decides in a no-load state only for a predetermined time period to avoid an erroneous decision even if a start decision result is not identical to a starter behavior during cranking and a no-load switch represents an in-gear state. The system comprises a sensor 8 for outputting a reference signal CA, a sensor 17 for sensing a turbine speed Rt, a switch 19 for outputting a signal NL indicative of a no-load state on the basis of a shift lever position, a unit 21 for deciding on an engine stopping state on the basis of the reference signal CA, a unit 22 for comparing the turbine speed Rt with a first set value, a unit 23 for deciding on a speed change state on the basis of the reference signal CA, the signal NL and the turbine speed Rt, a unit 24 for deciding on a starting state, and a unit 25A for deciding on an in-gear state on the basis of the decision results E, H, G and St and the signal NL. When the in-gear state is indeterminable, a decision is made, over a predetermined time period, that the automatic transmission is in the out-of-gear state.

REFERENCES:
patent: 4364343 (1982-12-01), Malik
patent: 4702127 (1987-10-01), Cote
patent: 4945484 (1990-07-01), Cote et al.
patent: 5036728 (1991-08-01), Kawasoe et al.
patent: 5188070 (1993-02-01), Otsuka et al.
patent: 5252861 (1993-10-01), Steeby et al.

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