Ignition system

IGNITION SYSTEM

FUNCTION OF IGNITION SYSTEM

TO IGNITE THE COMRESSED AIR-FUEL MIXTURE IN THE COMBUSTION

CHAMBERS

CONSTRUCTION AND

OPERATION OF CONTACT

POINT TYPE IGNITION SYSTEM

PRIMARY CIRCUIT

SECONDARYCIRCUIT

IGNITION COIL

EXAMPLE

CAMSHAFT POSITION SENSOR

• The Hall sensor (sometimes called the Camshaft Position Sensor, CPS) is a separate unit from the Crankshaft Position Sensor (KPS), G28.

• The sensor is located at the end of the camshaft for the cylinder head.

• The voltage supply to the Hall sensor is provided by the MPI control unit.

• The signals from the reference sensor and the Hall sensor are used to identify the ignition TDC of the number three cylinder.

• When starting the engine, the first ignition and injection points are triggered by the MPI control unit after receiving both signals.

KNOCK SENSOR

• The knock sensors make use of this phenomenon by sending the ECU a signal at the onset of engine knock. The sensor contains a Piezo electric element which, when deformed by cylinder block vibration, infers that detonation (knock) is occurring and informs the ECU by generating a voltage. The ECU reacts to this signal by retarding the ignition timing. Vigor engines have two knock sensors. (See illustration at right for location.)