Porsche CAYENNE Brochure page 27

Maximum freedom requires total control.
Electronic engine management.
The electronic engine management One of the most important systems
system provides coordinated controlled by engine management
regulation of all engine functions is the electronic throttle, a
and associated systems in all prerequisite for Porsche Stability
operating conditions. Management (PSM). Other major
functions include on-board diagnos-
The basic principle of engine tics and cylinder-specific knock
management is simple. Throughout control featuring automatic compen-
each journey, the system monitors sation for changes in fuel quality.
a range of input data and compares
it with corresponding sets of On the Cayenne, Cayenne S
reference values ('maps'). Key and Cayenne GTS, the engine
engine functions, such as ignition management system controls
and fuel injection, can be seamlessly
and automatically adjusted. The
results: optimum fuel economy and
lower emissions as well as greater
power and torque.
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the variable-tract intake manifold. Engine management functions in the Cayenne.
On the Cayenne Turbo, it regulates
the turbo boost pressure.
Input data
Engine speed (from crankshaft)
Inlet camshaft phase angle
Engine load
Throttle-valve angle
Oxygen sensor signals
Knock sensor signals
Temperatures
– Coolant
– Intake air
– Engine oil
– Ambient air
Vehicle speed
Air-conditioning settings
Throttle pedal position
Fuel pressure
Oil pressure
CAN interface to PSM control unit, transmission control unit, engine immobiliser, instrument cluster,
Used to regulate/control
Ignition Zündung
Direct fuel injection (DFI)
Idling via throttle valve and ignition
Heating elements in oxygen sensors
Cylinder-specific knock control
Demand-controlled fuel pump
Fuel-tank venting
Camshaft phase angle
Engine fan
Starter
Fuel pressure
Throttle valve
Intake manifold resonance valve
air-conditioning control unit, 'Sport' button, on-board diagnostics, etc.
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Engine management functions in the Cayenne S, Cayenne GTS and Cayenne Turbo.
Input data
Engine speed (from crankshaft)
Inlet camshaft phase angle
Engine load
Throttle-valve angle
Oxygen sensor signals
Knock sensor signals
Temperatures
– Coolant
– Intake air
– Engine oil
– Ambient air
Vehicle speed
Air-conditioning settings
Throttle pedal position
Fuel pressure
Oil pressure
CAN interface to PSM control unit, transmission control unit, engine immobiliser, instrument cluster,
air-conditioning control unit, 'Sport' button, on-board diagnostics, etc.
· 58 ·
Drive
Used to regulate/control
Ignition
Direct fuel injection (DFI)
Idling via throttle valve and ignition
Heating elements in oxygen sensors
Cylinder-specific knock control
Demand-controlled fuel pump
Fuel-tank venting
Camshaft phase angle
Valve lift (VarioCam Plus)
Engine fan
Starter
Oil pressure
Fuel pressure
Throttle valve
Intake manifold resonance valve
(Cayenne S/Cayenne GTS)
Wastegate frequency valve
(Cayenne Turbo only)
Bypass valves (Cayenne Turbo only)