Gearshift Control

The gearshift control system is based on a software strategy for shift point determination which corresponds to the driving conditions and the driver input.

The TCM actuates the relevant DC motors in order to perform the automatic gearshift.

In order to be able to precisely determine the shift points on the basis of the selected driving program, the TCM receives the following information: 

• Chosen transmission range
• Vehicle speed via the HS- CAN data bus
• Engine speed and torque as well as the throttle position via the HS- CAN data bus
• Engine temperature via the HS- CAN data bus
• Outside air temperature via the HS- CAN data bus for determining the viscosity of the transmission fluid when cold
• Steering angle from the steering wheel rotation sensor via the HS- CAN databus in order to avoid upshifts or downshifts during cornering.
• Information about braking interventions via the HS- CAN databus
• Input shaft speed for even and uneven gears from the respective speed sensor