Step-out clutch-to-clutch upshift control

Details Step-out clutch-to-clutch upshift control Step-out clutch-to-clutch upshift control

1986-02-03

1987-11-17

Bonck, Rodney H.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74877, 74733, 3644241, B60K 4108

Patent

active

047065222

ABSTRACT:
A control method for the torque establishing devices of a motor vehicle multiple speed ratio automatic transmission which is connected to the engine through a fluid coupling, particularly in step-out situations where an upshift is commanded in response to a rapid decrease in the engine throttle position. When step-out situations likely to produce a sharp reversal in the polarity of torque carried by the transmission input shaft are identified, an activated torque establishing device is deactivated at a time determined in relation to the speed ratio across the fluid coupling, thereby avoiding transmission gear lash related output torque disturbances due to the torque reversal.

REFERENCES:
patent: 3662625 (1972-05-01), Wakamatsu et al.
patent: 4031782 (1977-06-01), Miller et al.
patent: 4102222 (1978-07-01), Miller et al.
patent: 4314340 (1982-02-01), Miki et al.
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4502354 (1985-03-01), Suzuki et al.
patent: 4517859 (1985-05-01), Nagaoka et al.

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