Engine ignition system with automatic transmission
Engines with automatic transmissions use special ignition systems that take into account the specific operation of the automatic transmission.
Main components:
* Electronic control unit (ECU)
* Ignition coils
* Spark plugs
* Crankshaft position sensor (CPS)
* Camshaft position sensor (CPR)
* Automatic transmission input shaft speed sensor
Working principle:
1. Crankshaft and camshaft position sensors determine the position of the pistons and valves.
2. The computer processes signals from the sensors and calculates the ignition timing.
3. The ignition coils create high voltage, which is supplied to the spark plugs.
4. Spark plugs ignite the fuel-air mixture in the cylinders.
5. The automatic transmission input shaft rotation speed sensor informs the ECU about the current gear and operating mode of the gearbox.
Differences from the ignition system with manual transmission:
* The ignition system of an automatic transmission engine uses an input shaft speed sensor to adjust the ignition timing depending on the selected gear and engine load.
* The ECU takes into account the transmission mode (e.g. kick-down mode) and adjusts the fuel supply and ignition to ensure optimal dynamic performance.
* When changing gears, the ignition system can automatically adjust the ignition timing for smooth transition between gears.
Advantages:
* Optimal ignition in all operating conditions
* Smooth and efficient gear shifting
* Improving the dynamic characteristics of the car
* Reduced fuel consumption and exhaust emissions