INTEGRATED ENGINE AND TRANSMISSION CONTROL SYSTEM

摘要

A control system (30) is provided for a vehicle (10) regulating engine speed during shifts so as to reduce driveline torque and shift shock. The control system (30) includes separate microprocessor based engine and transmission controllers (32, 34) which communicate via a data link. When a shift is initiated, the transmission controller (34) delays a period of time sufficient for the transmission (14) to disengage the old gear ratio and then produces a CTSSPEED signal. The transmission controller (34) continues to produce the CTSSPEED signal for a second period of time which corresponds to the time required for the transmission (14) to engage the new gear ratio. The engine controller (32) receives the desired engine speed signal (NOP) and regulates engine speed (NA) 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.