Optimization Design of Injection Pump Cam of Single Cylinder Direct Injection Diesel Engine Combined with Artificial Intelligence Algorithm

Abstract

Most models of low-power off-road diesel engines in China are single-cylinder diesel engines. The production, use and export of single-cylinder diesel engines are one of the characteristics of internal combustion engine industry in China. As the emission standards of off-road diesel engines are becoming stricter in China, it is of academic significance and engineering application value to study the low emission mechanism and optimization of low emission technical scheme of single-cylinder diesel engines. The purpose of this paper is to study the optimal design of injection pump cam of single cylinder direct injection diesel engine combined with artificial intelligence algorithm. The problems existing in the fuel injection system of domestic large bore single cylinder diesel engine are analyzed. The measures to improve the injection pressure of single cylinder engine are put forward. The basic principle and method of oil pump cam design are given. The artificial intelligence technology is used to simulate and model the new oil pump cam. According to the calculation, the cam design of single-cylinder engine fuel injection pump has its own characteristics. In the design, not only the general technology of the cam design of fuel injection pump, but also the special requirements of the installation and adjustment of single-cylinder engine should be considered to meet the needs of the overall layout of diesel engine. Based on the optimization scheme, the influence of key parameters changes on diesel engine emissions in the simulated production process is studied. The calculation results show that in order to ensure the effective control of emissions, performance and production consistency, it is necessary to reduce the change range of key parameters in the production process. The calculation and analysis show that the fuel supply advance angle, compression clearance and injector extension height are controlled within ±0.5°CA, ±0.08mm and ±0.1mm respectively. The increase percentage of NOx emission is within 9.8%, and the increase percentage of Soot emission is within 8.4%. The calculation results can guide the control of parameters and dimensional tolerance of parts in diesel engine production.