Hydraulically operated vehicle transmission

Details Hydraulically operated vehicle transmission Hydraulically operated vehicle transmission

1996-02-29

1997-10-28

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

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

477156, F16H 5972, F16H 5964, F16H 5978

Patent

active

056812370

ABSTRACT:
A vehicle automatic transmission control system having a torque converter having an input connected to an internal combustion engine mounted on the vehicle and an output connected to a gear system of the transmission, 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, it calculates 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 quantitatively and uses the sum of the calculated values to determine the estimated ATF temperature TATF. The parameters used for calculating the temperature include the state of the torque converter, the type of gearshift, a vehicle speed (temperature increase owing to stirring of the ATF), the state of a heat exchanger, and the like.

REFERENCES:
patent: 4815340 (1989-03-01), Iwatsuki et al.
patent: 4928235 (1990-05-01), Mehta et al.
patent: 5345843 (1994-09-01), Fujita et al.

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