This ignition device consists of an igniter and an ignition coil that is integrated into a single unit. In the past, high-voltage current was sent to the cylinders via high-tension cords. Now, an ignition coil can be connected directly to the spark plug of each cylinder through the use of the ignition coil united with igniter. The distance that the high voltage flows will be short by directly connecting the ignition coil and spark plug, causing the voltage-loss and electromagnetic interference to be decreased. Thus, the reliability of the ignition system is improved.
Here is an operation example based on the DIS of the 1NZ-FE engine, which uses the ignition coil united with igniter.
1. The engine ECU receives signals from various sensors and calculates the optimal ignition timing. (The engine ECU also effects timing advance control).
2. The engine ECU sends the IGT signals to the ignition coil united with igniters. The IGT signals are sent to each igniter according to the ignition order (1-3-4-2).
3. The ignition coil, to which the primary current has been shut off rapidly, generates a high-voltage current.
4. The IGF signal is sent to the engine ECU when the primary current exceeds a prescribed value. 5. High-voltage current, which is the generated in the secondary coil, flows to the spark plugs, causing ignition.
Operation Principle of the Transistorized Type
1. The signal generator generates an ignition signal.
2. The igniter receives the ignition signal and causes the primary current to flow intermittently.
3. The ignition coil, to which the primary current has been shut off abruptly, generates a high-voltage current.
4. The distributor distributes the highvoltage current generated by the secondary coil to the spark plugs.
5. The spark plugs receive the highvoltage current and ignite the air-fuel mixture. The timing advance is controlled through the use of the governor advancer or vacuum advancer.