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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
– Air in engine compartment
– Engine oil
– 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.
Used to regulate/control
Ignition
Manifold injection (Boxster)/
Direct Fuel Injection (Boxster S)
Idling via throttle valve and ignition
Heating of lambda sensors
Fuel pump (Boxster)/fuel pumps
controlled on-demand (Boxster S)
Fuel-tank venting
Camshaft position
Valve lift switchover
(VarioCam Plus)
Secondary-air injection (Boxster)
Engine fan
Starter
Continuously variable oil pump
Fuel pressure (Boxster S)
Throttle valve
Boxster
· 34 ·
Engine management system with
protect the cylinders and pistons
electronic throttle.
at high engine speeds and loads.
The on-board diagnostics, which
The electronic engine management
are compliant with European stan-
system ensures optimum engine
dards, ensure timely detection of
performance under all operating
any faults and defects that
conditions. It regulates all engine-
may occur in the exhaust and fuel
related functions and assemblies
system in good time and notify
(see diagram). The results: optimum
the driver immediately. This also
performance and torque with
prevents increased pollutant
reduced fuel consumption and
emissions and unnecessary fuel
emissions.
consumption.
Another important function of the
system is cylinder-specific knock
Two-stage resonance intake
manifold.
control. Since the six cylinders
never all work under precisely
the same conditions, they are
The intake manifold with dual-flow
monitored individually by the knock
distributor pipe has an adjustment
control. If necessary the ignition
valve which closes and opens
point is shifted individually to
at set engine speeds. A two-stage
Boxster
Boxster |
tuning effect creates oscillation
of the air mass in the intake
system, which in turn generates
a turbocharging effect and opti-
mises induction.
These two effects combine to
produce higher torque at low
engine speeds, a flatter torque
curve, and increased power
output at high engine speeds.
The acoustic properties of
the system are second to none,
producing the characteristic
Boxster sound.
· 35 ·
Drive
Boxster
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