Abstract
Abstract The electronically controlled fuel injection system of the diesel engine has multi-disciplinary characteristics and strong coupling. The programming method based on a mathematical model cannot be applied to the fuel system with a diversified structure arrangement. With the rapid development of hydrodynamics, more and more simulation software is applied in the actual research. Hydsim simulation platform is one of the best software for the simulation of the electronic control injection system. In this paper, the Hydsim simulation platform is used to simulate the electronic control injection system, and a test-bed for verification is built. Based on the experimental results, the injection characteristics of high-pressure common rail are studied. The validity and accuracy of the simulation model are verified by comparing the simulation value with the test value and the standard value. Finally, the influence of the structural parameters such as the inlet and outlet orifices and control pistons of the injection system on the injection characteristics is analysed, and the selection principle of each parameter in the system design is proposed, which provides a reliable basis for the structural optimisation.
Highlights
The Italian Company, Fiat, developed the ‘Unijet’ system
The Common Rail (CR) system was developed by Bosch, a German company
The fuel pressure in the control chamber rises somewhat, but the increase is not very large until the needle valve is fully opened and the fuel is injected into the cylinder at the maximum injection rate
Summary
The Italian Company, Fiat, developed the ‘Unijet’ system. The high-pressure pump in the system has its pressure regulator, which enables the system to better control the injection pressure in the pre-injection stage, reducing the emissions of nitrogen oxides and carbon dioxide [1]. Li Degang of Jilin University put forward the control method of fuel injection quantity by analysing the traction demand for high-pressure common rail diesel engine [6]. Hydsim simulation platform is one of the better software for simulation research of the electronic control fuel injection system. Each specific part of the fuel injection system can be simplified by the module provided by the platform, and each module only needs to be connected in different ways On this basis, the whole fuel injection system is controlled by connecting with the control system model of MATLAB/Simulink. This paper uses the Hydsim simulation platform to build the simulation model of the fuel injection system This model does not need to write complex programmes and can be seamlessly connected with the control unit, which greatly reduces the difficulty of simulation model construction. The fuel injection characteristics of the fuel injection system will be studied in depth
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