Fuel, Exhaust & Engine Electrics
Page 2.36
Other Functions Of The DME Control Unit
VarioCam Plus Control on V8 DFI Engines
VarioCam Plus technology is used for the first time in V8 engines in the
Cayenne model range. This system, which may be familiar to you from
the current sports car generation, enables intake valve lift switching in
addition to intake camshaft adjustment. This ensures optimum running
quality, low fuel consumption and low emissions as well as high power
and torque ratings in conjunction with the intake system.
Variable Oil Pump on V8 Engines
The DME control unit is responsible for the demand controlled operation
of the variable oil pump, while adjustment is performed hydraulically.
Engine management uses the input values for engine speed, tempera-
ture and torque. Based on this information, the engaged gear wheel
width and therfore the geometric displacement volume of the gear
wheel set is changed through the axial movement of a gear wheel
(moved hydraulically) and this in turn changes the oil pressure. The
pump ensures that only the pumping action required for the relevant
load range of the engine is initated. This reduces the energy consump-
tion of the oil pump to a minimum and also ensures demand controlled
lubrication.
Control of Electric Radiator Fans
The DME control unit also activates the two drivers for the electric
radiator fans in order to achieve infinitely adjustable control.
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