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fUEL SYSTEM - Sensors
14·9
,
Engine
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colonation
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DETONATION SENSOR
The
deton
ation
sensor detects
cylinder
block
vibration due to knOCKing
snd
outputs voltage
proportion~1
to its strellglh.
The number of
cylinder
block vibrations due 10
~nocking
vary tor
e~ch
engine and
in
the
detonation sensor, there are
a
vibration plale
with the sama number
of
vibrations
(natural
frequency)
~s
the cylinder
bloc~
and a
piewelectric element to
genef~t'"
vohage when
the vibration
pl<lte vibrates. "When
~nocking
occurs, the vibr<ltion
pl~te
resonates with the
cylinder
blod vibration
~nd
the detonation
sensor outputs a
high
voltage. When
knocking
ceases, the deton<ltion sensor
output
voltage
fal
ls
because the
vibrstion
plate doas not
resonate. The ellgine
control
unit uses this
sign<ll
to retard the
ignition
timing according
to
the
strength of the knocking.
INDUCTION CONTROL VALVE POSI·
TION SENSOR
The
induction
control valve
position sensor is
built
into
the vari3ble induction control servo,
and
inputs
valve position signal
to
the ellgine wntrol
unit.
Tha angina control unit performs
the
valve
opening/closing
control by using
this signal.
The engine
control
unit drives Ihe
induction
control valve once
10
a
fully closed position
(position where it hits the stopper) when the
ignition switch
is
turned on
to
perform
the
initial
sel1ing.
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