The ignition coil of the ignition coil is divided into two types: open magnetic type and closed magnetic type according to the magnetic path. The traditional ignition coil is of an open magnetic type. The iron core is folded with a Silicon steel sheet of about 0.3 mm. The iron core is wound with secondary and primary coils. The closed magnetic type uses an iron core shaped like III around the primary coil, and the outer coil is then wound around the secondary coil. The magnetic line consists of a closed magnetic circuit composed of a iron core. The advantages of closed magnetic ignition coil are less magnetic leakage, small energy loss, and small volume. Therefore, closed magnetic ignition coil is commonly used.
Firewire ring ignition principle
CNC ignition
At the high speed of modern automobiles, a digital electronically controlled ignition system controlled by a microprocessor has been adopted. The ignition system consists of three parts: microcomputer(computer), various sensors and ignition actuator.
In fact, in modern engines, the two subsystems of gasoline injection and ignition are controlled by the same ECU and use a set of sensors. The sensors are basically the same as those in the middle, such as crankshaft position sensors, position sensors, intake manifold pressure sensors, deflagration sensors, etc.. Among them, the deflagration sensor is a very important sensor for electronically controlled ignition(especially the engine with a exhaust gas turbocharged device). It can monitor whether the engine is deflagration and deflagration, and as a feedback signal, the ECU instruction is achieved. Ignition in advance, So that the engine does not explode and can achieve higher combustion efficiency.
The digital electrically controlled ignition system(ESA) is divided into two types: the type and the undivided type(DLI) according to the structure. The distributor type electric control ignition system uses only one ignition coil to generate high-voltage electricity, and then the distributor ignites each cylinder in sequence in accordance with the ignition order. Since the switching of the primary coil of the ignition coil is carried out by the electronic ignition circuit, the distributor has cancelled the disconnect device and only plays a high-voltage distribution function.
Double cylinder ignition
Two-cylinder ignition means that two cylinders use one ignition coil, so this ignition method can only be used on engines with an even number of cylinders. If on a 4-cylinder machine, when two cylinder pistons approach the upper stop point at the same time(one is compressed and the other is exhaust), the two spark plugs share the same ignition coil and ignite at the same time. At this time, one is an effective ignition. The other is invalid ignition. The former is in a mixture of high pressure and low temperature, and the latter is in the exhaust gas of low pressure and high temperature. Therefore, the resistance between the two spark plugs is completely different, and the generated energy is not the same, resulting in a much larger energy for effective ignition. About 80 % of the total energy.
Separate ignition.
The separate ignition method is to assign an ignition coil to each cylinder, and the ignition coil is directly installed on the top of the spark plug, which also cancels the high-voltage wire. This ignition method achieves accurate ignition through camshaft sensors or by monitoring cylinder compression. It is suitable for any cylinder number engine and is particularly suitable for engines with 4 valves per cylinder. Because the spark plug ignition coil combination can be installed in the middle of(DOHC), the gap space is fully utilized. Due to the cancellation of distributors and high-voltage lines, the energy transmission loss and leakage loss are minimal, there is no mechanical wear, and the ignition coils and spark plugs of each cylinder are assembled together, and the external metal is wrapped, which greatly reduces electromagnetic interference and can protect the engine. The normal work of the electronic control system.