Electronic ignition classification
When the traditional ignition system is working, the breaker contacts are separated instantaneously, which will generate sparks at the contacts and burn out the contacts. When the spark plug deposits carbon, it is easy to leak electricity, the secondary voltage does not go up, and it cannot be reliably ignited, resulting in high-speed misfire. The semiconductor ignition system overcomes these shortcomings and has a strong flashover capability to make the ignition reliable.
Electronic ignition systems are broadly classified into the following three categories:
(1) The ignition system consisting of non-contact breakers consisting of electromagnetic, infrared or Hall components is called a contactless igniter, and its amplification circuit is divided into a transistor circuit and a capacitor discharge circuit.
(2) The ignition system controlled by the ECU (Electronic Control Unit) is determined by the microprocessor in the ECU according to the signal of the crank angle sensor, so that it has no breaker, only the distributor, and directly controls the ignition coil according to the signal sent by the ECU. The switching of the primary circuit.
(3) Distributor-Less Ignition is the most advanced ignition system. The crankshaft sensor not only has the ignition timing signal, but also the cylinder identification signal, so that the ignition system can be directed to the specified cylinder. The ignition signal is sent at the specified time, which requires a separate ignition coil for each cylinder, but if it is a six-cylinder machine, the 1, 6 cylinders, 2, 5 cylinders, and 3, 4 cylinders each share an ignition coil, that is, three Ignition coils, obviously, when each ignition coil is ignited, there is always one cylinder that is ignited, and this should be noted when testing.
The non-contact ignition system can use low-impedance inductors, which greatly increase the primary current, make the secondary voltage up to 30kV, enhance the ignition energy to improve the ability to ignite the lean mixture, improve fuel economy and reduce exhaust Pollution. The distributorless ignition system is completely electronic and has no mechanical moving parts, which completely solves a series of faults caused by cam and bearing wear and contact ablation gap misalignment.