Torque Converter Lockup Clutch Control

TCC Lockup Graph:

Function
The aim of using the torque converter lockup dutch is to reduce the fuel consumption and exhaust gas emissions of the vehicle by reducing torque converter slip. This stands in contradiction to the ride comfort demands made on the drive train with regard to its vibration behavior. The task of the electronic transmission control is therefore to dose the clutch in all driving situations relevant to fuel consumption, if possible, and ensure that the engine vibrations are isolated from the drive train. The characteristic curves shown in the diagram illustrate the different operating states of the torque converter lockup dutch in relation to the accelerator pedal position and the transmission output speed, plotted for one transmission gear.

In addition to the evaluation of these characteristics, the status of the torque converter lockup dutch is also determined by other variables.

Variables influencing the states of the torque converter lockup clutch
Accelerator pedal movement
Uphill and downhill gradients
Transmission shift functions
Transmission oil temperature
Roadholding requirements
Load conditions
Engine control influences

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