![]() When the injector needs to close, the current in the coil needs to stop as quickly as possble. Once the injector has opened, the current would be allowed to reduce to a much lower holding level to keep the injector open. The ideal driver would provide masses of current initially to open the injector as quickly as possible. Lots of current is required to open the injector at that speed but if that high current level persisted throughout the open period, the coil would heat up (and possibly burn out) and energy would be wasted. Where multiple injector pulses are required for each cycle, the injector needs to open and close very quickly - the entire cycle can be much less than 1ms (a thousandth of a second). In just the same way as a starter motor needs much more current to start the engine moving than when the engine is turning, a solenoid needs more current to start the plunger moving and much less current (about half) to hold it open. Increasing the current increases the intensity of the magnetic field. ![]() When current passes through the injector's coil, it creates a magnetic field that moves the plunger. Petrol Direct Injection Wikipedia Background and Principles
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