3-3. Various Types of Control This system controls the fuel injection quantity and injection timing more optimally than the mechanical governor or timer used in conventional injection pumps. For system control, the ECU makes the necessary calculations based on signals received from sensors located in the engine and on the vehicle in order to control the timing and duration in which current is applied to the injectors, thus re- alizing optimal injection timing. A. Fuel Injection Rate Control Function The fuel injection rate control function controls the ratio of the quantity of fuel that is injected through the nozzle hole during a specified period. B.
Fuel Injection Quantity Control Function The fuel injection quantity control function, replaces the conventional governor function, and controls fuel injection to achieve an optimal injection quantity based on the engine speed and the accelerator opening. C. Fuel Injection Timing Control Function The fuel injection timing control function, replaces the conventional timer function, and controls the fuel injection to achieve an optimal injection timing according to the engine speed and the injection quantity. D.
Fuel Injection Pressure Control Function (Rail Pressure Control Function) ‡ The fuel injection pressure control function (rail pressure control function) uses a rail pressure sensor to measure fuel ‡ Pressure feedback control is implemented to match the optimal quantity (command quantity) set according to the engine pressure, and feeds this data to the ECU to control the pump discharge quantity. speed and the fuel injection quantity.
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