Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Patent
1993-08-20
1995-09-12
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
477 76, 477 86, 477143, 3644241, B60K 4108, F16D 4320, F16H 546
Patent
active
054493293
ABSTRACT:
A system and method for controlling the clutches in a vehicle powershift transmission. The control system includes a microprocessor which periodically executes an algorithm and which has a memory in which is stored a sequential set of time reference values and a sequential set of pressure values. The control system applies to each oncoming element a fill pressure pulse for fill periods which are unique for each element. The control system determines shift time values, subsequent to filling of the control elements, as a function of the fill period. The control system applies pressure signals to the control elements at times represented by the shift time values which are unique for each element. The control system determines, subsequent to a realignment time, realignment shift time values which are the same for all of the control elements. The control system also applies pressure signals to the control elements subsequent to the realignment time, at times determined as a function of the realignment shift time values.
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SAE Technical Paper Series No. 861212, Sep. 1986, "The Design and Development of a Four Speed Powershift Transmission with Electronic Clutch Pressure Modulation", J. E. Goodbar an Michael D. Testerman.
Brandon David E.
Falck Peter L.
Jeffries Dennis L.
Deere & Company
Ta Khoi Q.
Wright Dirk
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