Downshift control apparatus of vehicular automatic...

Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine

Reexamination Certificate

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Details

C477S107000, C477S110000, C477S148000, C477S149000, C701S064000, C701S066000

Reexamination Certificate

active

06843756

ABSTRACT:
In a vehicle in which a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation is performed for a predetermined period following a beginning of the accelerator operation, if it is determined that a clutch-to-clutch downshift judgment has been made, the reduction of the engaging pressure of a disengage-side friction engagement device is restrained until it is determined that the moderate throttle opening degree control has ended. Therefore, even if the turbine torque is returned to a normal value at the end of the moderate throttle opening degree control, insufficient engaging torque is avoided, and the takeover of engaging torque for the clutch-to-clutch downshift is smoothly performed while the turbine torque is stable. Hence, occurrence of a shock related to the end of the moderate throttle opening degree control is suitably prevented.

REFERENCES:
patent: 5583768 (1996-12-01), Hamajima et al.
patent: 5624351 (1997-04-01), Fujita et al.
patent: 6264580 (2001-07-01), Tabata et al.
patent: 6368249 (2002-04-01), Hubbard
patent: 6648796 (2003-11-01), Yeo
patent: 6736757 (2004-05-01), Kubo et al.
patent: 9-229176 (1997-09-01), None

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