Electronically controlled automatic transmission
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United States of America Patent
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Sep 26, 1989
Grant Date -
N/A
app pub date -
Aug 10, 1987
filing date -
Aug 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensed shift time and a standard value of shift time set for this shift are compared. If the result of the comparison is that the shift time does not fall within an allowable range of standard values, a signal outputted to a linear solenoid is varied in such a manner that the shift time will be held with the range of the standard values. Accordingly, actual shift time while a vehicle is traveling is constantly fed back and controlled so as to attain an optimum shift time. Therefore, even if a change in the shift time is brought about by a change in oil temperature in the transmission or by aging of friction elements or the like, the shift time can be corrected to an optimum value to improve shift sensation as well as the durability of the friction elements.
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