Development of Proportional Integral Derivative Controller of High-Pressure Pump in Stand-Alone Common Rail Injection System for Engine Research

This paper aims to develop a technique for controlling fuel pressure in a common rail injection system using proportional integral derivative control (PID). Test fuel was blended fuel between diesel and biodiesel of 93:7 %vol. The multiple injection strategies were tested under the injection pressure of 350 to 800 bar. Injection duration was varied in the range of 0.82-5 ms with a constant dwell time of 6.4 ms. Injection period was set as 171 ms, corresponding to the engine idle speed of 750 rpm. Suction control valve was controlled by pulse width modulation. The results showed that fuel pressure in the common rail can be controlled by PID controller for different injection strategies with fluctuation pressure in the rail less than 1%. The fluctuation pressure trends to have lower fluctuation pressure in case of higher pressure.