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| Rail pressure control method in experiment system of common-rail high pressure pumps |
| 1. School of Mechanical Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China; 2. Wuxi Weifu High Technology Co. Ltd Wuxi, Jiangsu 214000, China |
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Abstract Concerning the real engine control system, more precise rail pressure control is needed in performance test bench of high pressure pumps. In order to avoid the effects on test accuracy by rail pressure and fuel flow changing rapidly during injections, a pressure control valve was used to replace the injectors based on analysis on the detection demands of high pressure pumps. A model of rail pressure control was built and a control method for the test bench was determined. Thus a test bench controller was designed to control the pressure control valve and other actuators as a Engine Control Unit （ECU）. According to the system characteristics, a controller with digital signal processor（DSP） as core unit and a Fuzzy Selfadjusting PID controller was designed. Experiments were carried out, and the results show that the flow solenoid valve current is controlled within a tolerance of 0.2% , and the rail pressure is controlled within 0.4%, which meets the requirement of the high pressure pump experiment system.
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2010, Vol. 31 
