Chery QQ6 Service Manual download pdf (Page 8)

2. Tachogenerator of Engine

2.1 Function of the sensor:

As one of the uppermost sensors of engine, the tachogenerator of engine provides ECU with rev

signal, acceleration signal and crank angle signal etc. of engine. ECU will calculate injection

pulse-width, injection time and ignition timing through these signals and provide the instruments

with rev signal of engine.

2.2 Principle of the sensor:

The inductive tachogenerator work together with pulse disc, it is used in ignition system

without distributor providing engine speed and crank shaft top dead center information.

Inductive tachogenerator is made up of a permanent magnet and coil outside of magnet.

Pulse disc is a tooth disc with 60 teeth originally but there are two teeth opening. Pulse disc is

assembled on crank shaft and rotate with crankshaft. When the tooth tip passes through closely the

end of the inductive engine tachogenerator, the pulse disc made of the ferromagnetic material will

cut the line of magnetic force of the permanent magnet in the inductive engine tachogenerator to

generate inductive voltage in the coil as engine speed signal output.

Tachogenerator

1. Shielded wire 2. Permanent magnet

3. Housing of sensor 4. Installation bracket

5. Soft magnet core 6. Coil

7. Air gap 8. 60-2 gear ring

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Chery QQ6 Service Manual Page 8