Motorcycle Ignition Coil Two-cylinder Ignition Method
Motorcycle Ignition Coil two-cylinder ignition method
One, two-cylinder ignition method
Double cylinder ignition means that two cylinders combined with an ignition coil, so this ignition can only be used for the number of cylinders on the even engine. If the two cylinder pistons at the same time close to the top dead center (one is compressed another is the exhaust), the two spark plugs share the same ignition coil and the same time ignition, this time one is the effective ignition another is Invalid ignition, the former in the high-pressure low-temperature mixture, which is in low-pressure high-temperature exhaust gas, so the resistance between the two spark plugs completely different, the energy generated is not the same, resulting in effective energy much larger ignition , About 80% of the total energy.
Second, separate ignition method
The separate ignition method is to assign an ignition coil to each cylinder, and the ignition coil is mounted directly on the top of the spark plug, which also eliminates the high voltage line. This ignition is achieved by means of a camshaft sensor or by means of cylinder compression to achieve precise ignition, which is suitable for any number of cylinders and is particularly suitable for use with 4-cylinder engines per cylinder. Because the spark plug ignition coil assembly can be installed in the middle of the double overhead camshaft (DOHC), take full advantage of the gap space. Due to the elimination of the distributor and high-voltage lines, energy loss and leakage loss is minimal, no mechanical wear, and the cylinder of the ignition coil and spark plugs together, external metal package, significantly reducing the electromagnetic interference, can guarantee the normal engine control system jobs. Different ignition systems are generated due to the different control methods of the engine ignition timing and the primary coil current. According to the different ignition system
Development stage can be divided into: traditional mechanical contact ignition system, non-contact ignition system, computer-controlled electronic ignition system and computer-controlled non-distributor electronic ignition system.
1. Traditional mechanical contact ignition system:
The traditional ignition system has its ignition timing and the control of the primary coil current by the mechanical transmission of the breaker contacts. The distributor shaft, which is driven by the engine camshaft, controls the relationship between the opening and closing angles of the breaker and the working stroke of the engine. In order to enable the ignition advance angle to automatically adjust with the engine speed and load changes, the distributor is equipped with a centrifugal mechanical advance device and a vacuum advance device to sense the engine speed and load changes. The biggest drawback of the mechanical ignition system is that the closing angle can not be changed because of the mechanical linkage between the breaker and the drive cam. The closing time has a great relationship with the change of the engine speed. When the engine speed increases, the contact closure time is shortened, The primary coil current reduces the ignition energy to be reduced; when the engine speed decreases, the closing time is too long, causing the coil current to be too large to be easily damaged. This is a mechanical contact ignition system can not overcome the shortcomings.
2. Non-contact electronic ignition system:
In order to avoid the shortcomings of the mechanical contact ignition system contact easy to ablate damage, after the widely used transistor technology has produced a non-contact sensor as a control signal to high-power transistor for the switch instead of mechanical contact non-contact electronic ignition system. A significant advantage of this system is that the primary circuit current is turned on and off by the transistor, so the current value can be controlled by the circuit. The downside is that the ignition time in this system still uses a mechanical centrifugal advance device and a vacuum advance device, which is poorly adaptable to the engine operating conditions.
3. Microcomputer controlled electronic ignition system:
In order to improve the accuracy of the ignition system and the adaptability of various conditions, in the electronic ignition system, based on the use of computer control. The system is characterized by: not only without the distributor, but also in the advance angle of the control side there is no centrifugal advance device and vacuum advance device. From the primary coil current to the ignition time of all the use of computer control. The working principle is as follows: The microcomputer system detects the engine speed and the load by the sensor, thus inquires about the best control parameter in the internal memory, obtains the best ignition advance angle and the primary circuit of the ignition coil under this condition The best closing angle, through the control of the transistor off time to achieve control purposes.