Speed Signal
Speed signalThe input of the driving speed signal (V-signal) is required in the DME control unit for several functions.
It serves the purpose of maintaining the programmed maximum speed. Once this speed is reached, the individual ignition and injection signals are masked out.This ensures smooth shut-down.
On vehicles with the air conditioning switched on compressor activation is interrupted up to a driving speed of 13 km/h when accelerating under full load.
The idle speed is controlled at a driving speed signal > 0 km/h, i.e. the idle speed has a fixed value which is normally just above the engine speed when the vehicle is stationary.
The idle speed is controlled if the driving speed is 0 km/h. However, it is still corrected by the air conditioning system signal, the drive stage information on automatic vehicles and the light switch input.
The incoming V-signal in the DME control unit is made available via the CAN interface to the adaptive transmission control unit (AGS).