Shift Energy Management
WARNING: This page is about a different car, the 2005 Jaguar XJR, 2005 Jaguar XJ8, 2004 Jaguar XJR, and 2004 Jaguar XJ8. However, it is still accessible from the selected car via links, so may be relevant.
This function involves reducing or increasing the engine output torque during shifting. The aim when up-shifting is to reduce the energy that is dissipated in the friction elements of the transmission. This is done by reducing the engine torque during synchronization without interrupting the tractive drive. This function may be used for:
- Increasing the transmission service life by shortening the slipping time.
- Improving the shift comfort by reducing the step change in torque caused by the gearshift.
- Transferring a higher engine power, this is allowed by the mechanical in-gear strength of the transmission.
Real-time control of engine torque is required to maintain maximum shift quality and transmission durability. The TCM has the ability to control the engine output torque during the gearshift to synchronize with the operation of the transmission clutches.