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 (TORQUEE) and vehicle acceleration (dOS/dt) are sensed and, if engine torque is negative (TORQUEE <REF1) and vehicle acceleration is positive (dOS/dt>REF2), the retarder is caused to apply an increased level of retarding torque to the vehicle drive wheels.
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| Original language | English |
|---|---|
| Patent number | US5855534A |
| IPC | B60K 41/00 |
| Priority date | 12/01/96 |
| Filing date | 26/12/96 |
| Publication status | Published - 5 Jan 1999 |
ASJC Scopus subject areas
- Automotive Engineering