Design And Reseach On Electronic Control Unit For Electronic Unit Pump System Of Diesel Engine

The electronic control of diesel fuel injection system is the development trend for diesel engine in the future. Diesel Electronic Unit Pump (EUP) enjoys the advantages of digital control of fuel charge and injection pulse width and also reliability in operation; thus has a strong value in the field of high-power diesel engine. This paper conducts the research on the control unit for the electronic unit pump systems of certain diesel engine.This paper, on the basis of analyzing the structure and working principle of electronic unit pump system, proposes the hardware design for the control unit and completes the hardware design of the system. In particular, the boost circuit designed in this paper does not take up CPU resources, and has a stable output of 80V and ripple rate less than 5%. In accordance with the requirement for pump drive, this paper designs stable dual power drive circuit which has 80V/24V as high/low voltage drive with stable working performance in operation.On the basis of hardware platform, this paper completes the software development of the system. In particular, this paper divides the operating conditions of the system into 4 modes and proposes the transformation conditions for different work conditions as well as the control strategy; it analyzes in detail the injection control process timing order, completes by six-cylinder control process and modularization programming of control software; it employs the scheduling mechanism for the control events, achieving the optimizing of the CPU resources and improving the efficiency of the software.Testing is carried out on the injection drive module of the system. The testing result shows that the control unit injection drive module can drive the solenoid valve peak currents to 20A within 200μs, with high-voltage maintaining current at 15A and low-voltage maintaining current at 8A; the boost circuit has a potential drop of 5.2V and 4ms of restoring time; it achieves the drive control for the solenoid valve in accordance with the prescribed injection timing order; the test parameters are in line with the design requirements.