Electronic transmission control system with fail-safe system for

Details Electronic transmission control system with fail-safe system for Electronic transmission control system with fail-safe system for

1998-07-09

2000-06-20

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 46, 477 49, 477906, F16H 6116

Patent

active

060771879

ABSTRACT:
An electronic transmission control system having a fail-safe system for an automotive vehicle with a continuously variable automatic transmission whose speed-change ratio is changeable continuously depending on vehicle speed and engine load, comprises a hydraulic modulator producing at least a regulated line pressure necessary to adjust the speed-change ratio hydraulically, a desired speed-change ratio arithmetic processing section for calculating a desired speed-change ratio based on the vehicle speed and the engine load, and a desired line pressure arithmetic processing section for calculating a desired line pressure based on the desired speed-change ratio and the engine load. Also provided is a fail-safe section comprises a comparing portion for comparing the desired line pressure to a predetermined line pressure threshold above which the desired line pressure is within an unreasonably high line pressure zone, a decision portion for deciding on the basis of a result of comparison of the comparing portion whether the desired line pressure is above the predetermined line pressure threshold, and a speed-change ratio retaining portion for retaining the speed-change ratio of the continuously variable automatic transmission unchanged, when the desired line pressure exceeds the predetermined line pressure threshold.

REFERENCES:
patent: 4764156 (1988-08-01), Ohkumo
patent: 5052246 (1991-10-01), Yamaguchi
patent: 5334102 (1994-08-01), Sato

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