With the development of gasoline engines in automobiles towards high speed, high compression ratio, high power, low fuel consumption, and low emissions, traditional ignition devices are no longer suitable for use. The core components of ignition devices are ignition coils and switch devices. By increasing the energy of the ignition coils, the spark plug can generate sufficient energy to produce sparks, This is the basic condition for the ignition device to adapt to the operation of modern engines. The ignition coil is divided into two types according to the magnetic circuit: open magnetic and closed magnetic. The traditional ignition coil is used with an open magnetic type, and its iron core is stacked with about 0.3 millimeters of silicon steel, with secondary and primary coils wound around the iron core. The closed magnetic type uses an iron core similar to III to wrap around the primary coil, and then wraps around the secondary coil outside. The magnetic field line is composed of an iron core to form a closed magnetic circuit. The advantage of the closed magnetic ignition coil is that it has less magnetic leakage, Due to its small energy loss and volume, electronic ignition systems generally use closed field ignition coils)
The BMW 5 Series is the most advanced high-end sedan produced in China to date. The BMW 5 Series is undoubtedly one of the most outstanding series in automotive history, and today's 5 Series is the grandson of the E34. The style of the BMW 5 Series is positioned between the dynamic and fashionable 3 Series and the noble and elegant 7 Series. It perfectly integrates the functionality of dynamism, elegance, and high-end commercial sedans, unifying BMW's great tradition, enterprising spirit that guides the future, and aesthetic standards that can withstand the test of time
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