Control system for hydraulically operated vehicle transmission

Details Control system for hydraulically operated vehicle transmission Control system for hydraulically operated vehicle transmission

1996-02-29

1998-01-13

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

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

477 97, F16H 5978

Patent

active

057073155

ABSTRACT:
A vehicle automatic transmission control system which makes it possible to estimate an ATF temperature without using an expensive ATF temperature sensor. The estimation of the ATF temperature is configured such that based on the coolant temperature at engine starting, the temperature increase owing to heat inflow to the ATF per unit time and the temperature decrease owing to heat outflow from the ATF per unit time are calculated quantitatively and the sum of the calculated values is used to determine the estimated ATF temperature TATF. More specifically, when it is found that only a short time has passed between engine turnoff and restarting, the ATF temperature is estimated at engine restarting from the coolant temperature at engine turnoff, the estimated ATF temperature at engine turnoff and the coolant temperature at engine restarting. On the other hand, when the time between engine turnoff and restarting is found to be long, both the coolant and the ATF are assumed to be completely cooled and the ATF temperature is in principle defined as the coolant temperature at restarting.

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