Point d: Breakdown high voltage generated by the secondary coil at the moment of primary power failure breaks down the highest voltage point of the spark plug gap, immediately dropping once the spark plug gap has been broken. The breakdown voltage is affected by many factors, such as spark plug gap, spark plug electrode shape, mixture concentration, cylinder pressure, cylinder compression temperature and so on.
The larger the spark plug electrode gap, the sharper the electrode shape, the higher the breakdown voltage and the greater ignition energy required. Mixture is too thick, because HC and air molecules are compressed and squeeze intensive, high pressure to make it more difficult for positive and negative electron separation, the need for greater voltage to make it ionized to form an electron flow spark. Mixture is too thin, HC and air molecules are relatively thin, the molecules can not be ionized at the same time, so that the higher the ionization voltage can penetrate the slender gap. The higher the temperature, the more active molecules, ionization easier, the required breakdown voltage is low, on the contrary the required voltage is high. Only moderate gas mixture, oil and gas molecules are evenly distributed, the electrode generates electron flow is relatively easy, the breakdown voltage at this time is the standard voltage.
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