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Fuel Emission and Exhaust System
D:05:01
IDLE SPEED CONTROL SYSTEM
SYSTEM DESCRIPTION
The De Lorean Sports Car is equipped with a
Bosch electronic idle speed control system. This
system is used to maintain an extremely accurate
engine idle speed under all operating conditions.
IDLE SPEED CONTROL PRINCIPLE
The control principle used is based on the fact that
an electronic control unit (ECU) module is
constantly monitoring the engine speed during an
idle condition and correcting this speed when
necessary.
The idle speed regulator contains a rotary valve
which controls the air flow through a duct that by-
passes the throttle plates. During engine warm-up,
for example, the engine speed is reduced due to
friction.
The idle speed regulator will open allowing
additional air flow to the engine, increasing the
RPM
to specification. (Fig. 35)
SYSTEM OPERATION
The idle speed regulator is constructed in a similar
fashion to that of an electric motor, its purpose is
to control the position of a rotary valve mounted
on its shaft. This valve controls the air flow
through a duct that by-passes the throttle plates.
The regulator is mounted on the left side of the
intake manifold. (Fig. 36)
To Inlet Manifold|
(Below Throttle i
Platesl
Air
in
Fig. 36
IDLE SPEED
REGULATOR
Fig. 35
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