Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1992-10-02
1994-06-28
Braun, Leslie A.
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
3644241, 477122, 477155, B60K 4108
Patent
active
053236670
ABSTRACT:
A control system is provided for a vehicle regulating engine speed during shifts so as to reduce driveline torque and shift shock. The control system includes separate microprocessor based engine and transmission controllers which communicate via a data link. When a shift is initiated, the transmission controller delays a period of time sufficient for the transmission to disengage the old gear ratio and then produces a CTSSPEED signal. The transmission controller continues to produce the CTSSPEED signal for a second period of time which corresponds to the time required for the transmission to engage the new gear ratio.
The engine controller receives the desired engine speed signal and regulates engine speed into correspondence with the desired speed. During upshifts, the CTSSPEED signal is set to a speed which is a predetermined amount above the synchronization speed of the new gear for an upshift. Conversely, during downshifts, the CTSSPEED is set to a speed which is a predetermined amount below the synchronization speed in the new gear.
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Brennemann Michael B.
King Kevin D.
McClure William M.
Tate William J.
Tweed Lorne W.
Braun Leslie A.
Caterpillar Inc.
Wilbur R. Carl
Wittels Daniel
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