Fuel engine injector control based on multiple search approach

Abstract

The main components of high-pressure common rail fuel injection system are high-pressure common rail fuel pump, common rail pipe and injector. The high-pressure fuel from the high-pressure oil pump is supplied to the injector through the high-pressure common rail oil pipe, which is precisely controlled by the electric control system and inject fuel into the cylinder. Generally, the power of the fuel engine is determined by the speed of the high pressure oil pump, and the key to improve the efficiency of it is to keep a constant pressure in oil pipe when high pressure oil pump is at a high speed. Therefore, methods need to be taken to control pressure in pipe when the cam rotates at a high speed, such as control speed of cam, adjust number of fuel injectors and the starting time of them in a cycle, with the aim of stabilizing internal pressure of oil pipe. In this study, we discretize the problem, establish the difference equation, and multiple searching method is adopted to find out the injector configuration mode which keep the pressure of the high-pressure oil pipe, with speed of, at 100MPa. Finally, we put forward a conjecture between the cam speed and the injector configuration, and carry out simulation verification.