The similarities and differences of traditional ignition system, common electronic ignition system and microcomputer-controlled ignition system are briefly described.

1. Traditional ignition: mechanical platinum circuit breaker controls the negative pole of primary circuit of ignition coil to disconnect to generate high voltage.

Semiconductor: Hall sensor or magnetoelectric sensor transmits the engine crankshaft signal to the semiconductor circuit (i.e. the ignition module), and the ignition coil is controlled by the power transistor in the ignition module.

Computer ignition: computer-controlled ignition system, electronic control ignition system and microcomputer-controlled ignition system all mean the same thing.

That is, the engine ECU calculates the appropriate ignition advance angle and ignition closing angle according to the signal of the sensor, so as to control the ignition coil and control the engine knocking. Still similar to semiconductor ignition, the principle is the same, or controlled by power transistors. But the computer also needs to collect water temperature, knock signal, throttle opening and other signals, and use the computer to correct the ignition time.

The difference is that the reliability is improving and the control accuracy is improving. The first two kinds of advance angle adjustment are only based on the change of speed (not speed) and vacuum degree, and the third one is based on the data of each sensor.

In the traditional ignition system, the battery and engine are used as power supplies, and the low-voltage direct current of 6V, 12V or 24V provided by the power supply is converted into high-voltage electricity through the action of the ignition coil and the circuit breaker, which is distributed to the spark plugs of each cylinder through the distributor, so that an electric spark is generated between the two electrodes of the spark plug to ignite the combustible mixture.

Or let me put it this way:

1. Semiconductor ignition system, that is, electronic ignition system, uses battery and generator as power supply, uses ignition coil and ignition controller composed of semiconductor devices (transistors) to convert the low voltage provided by power supply into high voltage, and then distributes it to the spark plugs of each cylinder through distributor, so that an electric spark is generated between the two electrodes of the spark plug to ignite the combustible mixture.

Second, the microcomputer-controlled ignition system, like the above two kinds of ignition systems, also uses batteries and generators as power supplies. The low-voltage electricity of the power supply is converted into high-voltage electricity by the ignition coil, and then the high-voltage electricity is distributed to the spark plugs of each cylinder by the distributor. The microcomputer control system sends out ignition control signals according to the information provided by various sensors reflecting the engine working conditions, controls the ignition time and ignites the combustible mixture.