DIRECT IGNITION SYSTEM

0815024 BURHANUDDIN BHANPURA 0815040 IVAN KASOOKAR

HISTORYIn 1907 Charles invented the First Point

Ignition SytemIn 1972 High Energy Ignition Sytem

was introducedIn 1985 Direct Ignition System or also

known as Distributorless Ignition Sytem was introduced by Padeack

ADVANTAGES The main advantage with this system was that it

provided improved economy and performance with reduced emissions. Other advantages included:

Fewer moving parts (less parts to replace)More compact mountingElimination of mechanical timing adjustmentsLess maintenanceMore coil cool down between firing events

COMPONENTSCrankshaft Timing Sensor: located in the front of the

crankshaft to trigger the ignition system. This sensor consists of a single Hall effect magnetic switch activated by 3 vanes on the crankshaft damper and pulley assembly. This sensor sends a signal that feeds timing and RPM information to the DIS and computer module.

COMPONENTSCamshaft Sensor: it is driven by the camshaft and

provides information on the cylinder position for the ignition coil and fuel system

COMPONENTSIgnition (DIS) Module: it receives

the signal from the crankshaft sensor and the camshaft sensor. It also receives the spark signal from the vehicle's central computer. Its major purpose is to use the information supplied to it to control the ignition coils. The reason it does this is to ensure that they fire in the correct sequence. The DIS module also controls the engine dwell.

COMPONENTSIgnition Coil Pack: it is comprised of multiple ignition

coils. The DIS module controls these coils by means of coil leads. The ignition coils fire two spark plugs simultaneously; one on the compression stroke and one on the exhaust stroke.

POINT IGNITION SYSTEM

TUNE UP EVERY 12000 MILES

DIS

NO WEARING

POINT IGNITION SYSTEM

The distributor coil opens and close to charge and discharge the coil

DIS

CPS communicates to module using the Hall effect

TRIGGER WHEEL

CPS at 7 indicates piston is at TDC

DIS

•Pistons are always matched in pairs •Each coil fires two cylinders simultaneously

FLOW OF CURRENT

•Current in spark plug of 1st cylinder flows from center electrode to ground electrode•Current then flows from ground electrode to center electrode in the second cylinder spark plug

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