What's the difference between Volkswagen and Toyota's ignition system? Introduction of independent ignition principle.

1. Volkswagen's ignition system is exactly the same as Toyota's.

2. Independent ignition means that each cylinder is equipped with an ignition coil, which is directly installed on the top of the spark plug, thus eliminating the high-voltage line. This ignition method can realize accurate ignition by camshaft sensor or by monitoring cylinder compression. It is suitable for engines with any number of cylinders, especially for engines with 4 valves per cylinder. Because the ignition coil combination of the spark plug can be installed in the middle of DOHC, the gap space is fully utilized. Because the distributor and high-voltage line are cancelled, the energy conduction loss and leakage loss are very small, and there is no mechanical wear. Moreover, the ignition coil and spark plug of each cylinder are assembled together and wrapped with metal, which greatly reduces the electromagnetic interference and can ensure the normal work of the engine electronic control system.

3. The working principle of independent ignition system is basically the same as other ignition systems. The usual ignition coil has two groups of coils, primary coil and secondary coil. The reason why the ignition coil can change the low-voltage electricity on the car into high voltage is because it is the same as the ordinary transformer, and the turn ratio of the primary coil is greater than that of the secondary coil. When the primary coil is connected to the power supply, with the increase of current, a strong magnetic field is generated around it, and the iron core stores magnetic field energy; When the switching device disconnects the circuit of the primary coil, the magnetic field of the primary coil decays rapidly, and the secondary coil will induce high voltage.