Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
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
Jozaki Tateki
Okahara Hirofumi
Suzuki Akito
Nissan Motor Co,. Ltd.
Ta Khoi Q.
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