Process for the gear change of the automatic transmission of mot

Details Process for the gear change of the automatic transmission of mot Process for the gear change of the automatic transmission of mot

1988-04-28

1990-01-30

Braun, Leslie A.

Machine element or mechanism

Gearing

With fluid drive

74733, 192 331, B60K 4122, F16H 4502, F16D 4702

Patent

active

048965650

ABSTRACT:
A process for controlling an automatic transmission wherein engine speed and output speed are measured and the slip conditions are derived therefrom. When conditions of downshift occur, as determined by excessively high slip and/or excessively low speed, the conditions existing at the moment of downshift are evaluated, and a comparative slip signal is derived and saved. This signal is employed as reference relating to the momentary slip conditions of the vehicle for use in determining the proper moment for a subsequent upshift. Thus, conditions for an upshift, following a particular downshift, are modified as a function of the circumstances requiring the downshift (e.g. normal deceleration, overtaking another vehicle, ascending a hill). Procedures are also included for enabling engagement of a friction clutch, for bypassing the torque converter of the transmission, under certain conditions in advance of an upshift.

REFERENCES:
patent: 3693479 (1972-09-01), Toyoda et al.
patent: 3713351 (1973-01-01), Sakakibara et al.

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