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)
Although this X1 model is called xDrive28i, BMW X1 has now become the most popular compact SUV The production version of the X1 model is very similar to the concept version. The BMW X1 has two types of drive settings: four-wheel drive and rear wheel drive. It will provide a 177 horsepower diesel engine with 0-100km/h acceleration of 8.4 seconds, an average fuel consumption of 17.8 kilometers per liter, and a 204 horsepower diesel engine with 0-100km/h acceleration of 8.4 seconds, as well as the top-level model
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