These devices differ from a conventional high-pressure fuel pump in that each pump-injector supplies fuel to one cylinder and is a separate unit.
For injection, the mechanical energy of pressing the camshaft cam is used. At the same time, fuel is supplied to the injector pump inlet under increased pressure, which develops as a fuel (double with vacuum) pump.
The injector is controlled by the injection control unit, which sends control pulses to the unit injector.
In this case, the control unit takes into account the following parameters:
- an accelerator pedal sensor signal containing information about a desired engine power level;
- air flow meter data;
- data on the temperature of the coolant and incoming air;
- signals of the speed sensor and the position of the crankshaft;
- camshaft position sensor signals;
- signals from other devices, depending on the configuration of the vehicle's power plant.
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