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As modern engine technology has evolved, optimizing engine performance has become a key research focus for the industry in the face of increasingly stringent environmental regulations and growing demand for energy efficiency. The diameter of the exhaust manifold plays a key role in determining engine performance. This study utilized GT-POWER software to develop an engine simulation model aimed at investigating the effects of different exhaust manifold diameters on engine power, torque, and fuel consumption. The results demonstrated that increasing the exhaust manifold diameter within a specified range significantly reduced fuel consumption at lower speeds, with minimal impact on power and torque. However, at moderate to high speeds, enlarging the exhaust manifold diameter led to a significant increase in power output, an increase in peak torque, and a decrease in fuel consumption, resulting in the shift of peak torque and minimum fuel consumption to higher speeds. These findings provide valuable insights for optimizing engine exhaust manifold design.

To explore the maximum of energy saving potential of hybrid loader and analyze the energy-saving ways of hybrid loader, the researcher took use of AMEsim software to build hybrid loader model. The author simulated on the energy saving ways and made the prototype test at the same time. In the end, with the quantitative approaches, the energy saving potential of energy saving ways were shown in the end.

In order to have a depth research for the combustion process and the status of the engine emissions, it is necessary to develop a excellent combustion analysis system. The data collection, data processing, data computing and other display functions were realized by the self-developed combustion analysis system software, and some relative analyses of cylinder dynamic combustion were done. At the same time, it is so important for designers have an optimization of engine if they use the P-Φ indicator diagrams. Pmax indicator diagrams, air-fuel ratio(ξ)and fuel consumption variation data and so on. The test system for an internal engine combustion analysis through continuous testing and use, is feasible. No doubt, Better user interface and lower costs of this combustion system is pretty good for tester analysis the related data. Designers could facilitate the continuous development and utilization, so it has a certain value in engineering.