Shift control system/method for vehicle equipped with driveline

Details Shift control system/method for vehicle equipped with driveline Shift control system/method for vehicle equipped with driveline

1996-12-26

1999-01-05

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477121, 701 54, B60K 4100

Patent

active

058555340

ABSTRACT:
A control system and method is provided for controlling shifting of a vehicular powertrain system (10) including an internal combustion engine (12) drivingly coupled to a mechanical change-gear transmission (14) having a transmission output shaft (22) drivingly coupled to vehicular drive wheels (26) and having a driveline retarder (52) associated therewith. To prevent undesirable vehicle acceleration during shift transients occurring when the vehicle is traveling down a grade, input signals indicative of engine torque (TORQUE.sub.E) and vehicle acceleration (dOS/dt) are sensed and, if engine torque is negative (TORQUE.sub.E <REF.sub.1) and vehicle acceleration is positive (dOS/dt>REF.sub.2), the retarder is caused to apply an increased level of retarding torque to the vehicle drive wheels.

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