Porsche 911 Carrera 4 Brochure & Specs page 24

Input data
Engine speed (from crankshaft)
Inlet camshaft phase angle
Engine load
Throttle-valve angle
Lambda sensor signals
Knock sensor signals
Temperatures – Coolant
– Intake air
– Engine oil
– Air in engine compartment
– Ambient air
Pressures – Engine oil
– Fuel
– Ambient air
Vehicle speed
Air-conditioning settings
Accelerator pedal
CAN interface with driving dynamics control, transmission control, immobiliser, instrument cluster, climate control,
Sport button, Sport Plus button, sports exhaust system button, diagnostics, etc.
Engine management system.
Stability Management (PSM),
which comes as standard.
The EMS SDI 3.1 engine manage- Moreover, it regulates all engine-
ment system ensures optimum related functions and assemblies
engine performance at all times. (see diagram). The results:
optimum fuel economy, emissions,
In particular, it controls the and performance in all driving
position of the electronic throttle situations.
valve (ETV) – a prerequisite for
compatibility with the Porsche
Regulation/control of
Ignition
Direct fuel injection
Idling via throttle valve
and ignition
Heating of lambda sensors
Fuel pumps controlled on-demand
Fuel-tank venting
Camshaft position
Valve lift switchover
(VarioCam Plus)
Engine fan
Starter
Oil pressure, fully variable oil pump
Fuel pressure
Throttle valve
Another important function of the
system is cylinder-specific knock
control. Since the six cylinders
never all work under exactly
the same conditions, they are
monitored individually by the
knock control. The ignition point
is shifted individually, as and when
necessary to prevent damage
to the cylinders and pistons at
high engine speeds and loads. Servicing.
The on-board diagnostics, which
are compliant with European Every Porsche is designed with
standards, ensure timely detection longevity in mind and the 911
of any faults and defects that is no different. The alternator,
may occur in the exhaust and fuel power-steering pump and the
systems and notify the driver air-conditioning compressor are
immediately. This also prevents all driven by a single self-adjusting
increased pollutant emissions and belt. Hydraulic valve clearance
unnecessary fuel consumption.
The 911 |
Engine
911 Targa 4S
compensation makes valve clear-
ance adjustment unnecessary.
The drive chains on the camshafts
do not require servicing. With
the sole exception of the spark
plugs, the ignition system is also
maintenance-free. This all adds
up to long maintenance intervals
which are guaranteed by warranty:
two years, unlimited mileage.