direct ignition system
DESCRIPTION
A Presentation for Automobile Engineering of sem 8TRANSCRIPT
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
THANK YOU