Constant pressure control for steady — State pressure flow test of proportional valve

Abstract

The steady-state flow characteristic test is very important for the proportional flow valve. The test requires that the value pressure drop retain constantly with proportional input valve being scanned between the minimum and maximum values during a complete cycle test. In order to ensure that the pressure stability during the test. This paper presents a fuzzy PID control method and uses the accumulator to absorb the pressure pulsation and impact, and analyzes the principle of control, based on the steady flow characteristics of the metering valve which is responsible for the oil regulation in the high pressure common rail fuel system of the diesel engine. Test bench is established. by Contrasting the traditional PID control method, the test results show that the control method of the fuzzy PID plus the accumulator in the steady flow test has better effect.