Rpm And Tdc Sensor (Jaeger Cvm02) - Fiat Bravo Service Manual

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RPM AND T D C SENSOR

(Jaeger CVM02)

The sensor (1) for rpm and reference of the

crankshaft angle (identification of TDC) is

secured to the engine block and is opposite

crankshaft pulley.

Principle of operation

The sensor consists of a tubular case (1)

containing a permanent magnet (3)

electrical winding (2). The magnetic f l o w

created by the magnet (3) causes oscillations

following the change of gap, because of the

passage of the teeth of the phonic wheel.

These oscillations induce an electromotive

force in the winding (2) at theBnds o f w h i c h

there is a voltage which is alternately positive

(tooth opposite the sensor) and negative

(gap opposite the sensor). Provided all other

factors are equal, the peak output voltage

from the sensor depends on the distance be-

tween sensor and tooth (gap).

The phonic wheel has sixty teeth, t w o of

which are removed to create a reference; the

pitch of the wheel thus corresponds to an an-

gle of 6° (360° divided by 60 teeth). The point

of synchronization is recognized at the end of

the first tooth following the t w o missing teeth;

when this space passes under the sensor, the

engine is with the piston pair 1 -4 at 114° be-

3. Permanent magnet

4. Sensor connector

5. Output signal

6. Signal corresponding

7. Crankshaft

to the t w o

w i t h phonic wheel