Integrated engine and transmission control system

摘要

A control system (30) is provided for vehicle 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 (36). When a shift is initiated, the transmission controller (34) delays a first period of time CTSDELAY 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 CTSDUR which corresponds to the time required for the transmission (14) to engage the new gear ratio. The control system (30) preferably includes means for sensing a lockup time period corresponding to the time required for the transmission (14) to lock up in the new gear ratio. The control system (30) is capable of modifying the second time period CTSDUR as a function of the sensed lockup time period.