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Engine management system.
The EMS SDI 3.1 engine
management system
ensures optimal en gine
performan ce at all times.
In particular, it controls the
position of the e lectronic th rottle
valve (ETV)—a prerequisite for
compatibility with th e Porsche
Stability Management (PSM),
which comes as standard .
Moreover, it regulates all
engine-related functions and
ass emblies
(see diagram). The
results:
optimal fuel economy,
emissions and performance
in all driving situations.
Another important function of the
system is cylinder-specific knock
control. Since the six cylinders
never all wo rk under exactly
the same conditions, they are
monitored individually by the
knock control. T he ignit ion point
is shifted individually, as an d when
necessary to prevent damage
to the cylinders and pistons at
Input data Regulation/control of
Electronic Engine Management
EMS SDI 3.1
Engine load
Lambda Sensor
®
signals
Knock sensor signals
Engine speed (from crankshaf t)
Inlet camshaft phase angle
Vehicle speed
Air-conditioning settings
Temperatures – Coolant
– Intake air
– Engine oil
–
Air in engine compartment
– Ambient air
Ignition
Direct Fuel Injection (DFI)
Heating of Lambda Sensors
®
Fuel pumps controlled on demand
Fuel-tank venting
CAN interface with drivi ng dynamics control, transmissio n con trol, immob ilizer, instrument cluster, climate control,
Sport butt on, Sport Plus button, sport exhaus t system button, diagnostics, etc.
Engine fan
Starter
Oil pressure, fully variable oil pump
Fuel pressure
Throttle-valve angle
Idling via throttle v alve
and ignition
Accelerator pedal Throttle valve
Camshaft position
Valve-li ft switchover
(VarioCam Plus)
Pressures – Engine oil
– Fuel
– Ambient air
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