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Home >> Volvo >> 2009 >> XC70 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical Modules And Components - Design And Function - 5 Of 5 >> Transmission Control Module (TCM) (2011-2012) >> Function >> Other Modes
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Other Modes

Adaptation 

The transmission control module (TCM) monitors each shift during all driving conditions to fulfill consistent shifting, smooth shifting in normal mode as well as hard shifting in sport mode. This is carried out by the control module either lowering or increasing the hydraulic line pressure used during the shift itself. The changed pressure levels are stored in the control module memory when the car has been switched off and are retrieved on start-up. This provides improved shifting comfort and increased service life.

Complete adaptation occurs when the following conditions have been met:

Driving uphill 

The Transmission Control Module (TCM) can change the gearshift pattern slightly when driving uphill. This is to avoid close gearshifts.

Neutral control (only available on certain models) 

This function is activated when the driver stops the car and the car is stationary, at traffic lights for example. The transmission control module (TCM) then partly disengages the C1 clutch which releases the forward drive of the transmission and reduces the load on the engine. The function improves fuel consumption and reduces vibrations at idle speed. When the driver releases the brake, the C1 clutch engages and drive is resumed.

The following conditions must be met in order for the neutral function to activate:

Alternative driving programs 

There are driving programs that are implemented in the transmission but that only are active on certain variants.

Kick-down 

When the accelerator pedal is pressed down past a certain point, the Kickdown function is activated. This means that downshifting takes place to get faster acceleration. The pedal position for Kickdown is designated as 110%.

Quick step 

Quick step makes the gearshifting function sportier when the driver is more aggressive on the pedal. Lower gears are used for better acceleration.

Fast Off 

Fast Off is used to reduce the number of shifts due to heavy traffic in, e. g., city traffic.

The function is activated at fast releases of the accelerator pedal. Even the vehicle's speed, brake pedal, and curve detection affect its function. By keeping a lower gear than normally, unnecessary shifts are avoided. For aborted passing, a lower gear is maintained to be able to take the initiative for future passing.

Curve hold 

The function Curve hold can block upshifting in case of curves to get better traction out of curves, for example, when driving in roundabouts.

Brake shift 

Adjusts shifting points according to brake pressure. The purpose is to have a lower gear when accelerating after braking.