The hydrodynamic automatic transmission is the most widely used automatic transmission, which is the core assembly of automobile to achieve automatic manoeuvring. Its shift quality is ultimately reflected as the vehicle's driving status through the transmission system. In this paper, based on analysing the power transmission route of the transmission system and the structural principle of the six-speed automatic transmission. It discusses its mathematical model and the evaluation index of shift quality in the process of shifting and establishes the AMESim model of the whole power transmission system including the automatic transmission. By simulating the process of accelerator pedal depressing and releasing, the heat generation of each clutch and brake is calculated. The changes of parameters such as engine torque output, vehicle speed, acceleration and impact degree during the gear shift were obtained. The effects of different torsion spring stiffnesses of the transmission system on the degree of impact are analysed to provide theoretical basis and reference for the subsequent structural design of the hydrodynamic automatic transmission.
The amount of intake resistance of the air filter has a significant impact on engine performance. This article proposes a structural optimization plan to address the issue of excessive intake resistance in an engine air filter. Based on computational fluid dynamics, simulation analysis was conducted on the pressure and velocity fields inside the air filter before and after optimization. The analysis results showed that the velocity uniformity of the air flow inside the optimized air filter was improved, and the intake resistance was significantly reduced. The physical inspection and inspection of the optimized air filter trial sample showed that the intake resistance was lower than the standard allowable value, and all performance indicators met the requirements, proving the effectiveness of the optimization plan.
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