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The evaporative emission and leak of vehicle fuel cause serious pollution to the environment. In order to find out the main influencing factors of the leak detection process of vehicle fuel evaporation system, the leak process and main influencing factors of vehicle fuel evaporation system were studied by means of simulation calculation and experimental research. The leak detection model of fuel evaporation system was established. The pressure decay process was simulated and calculated by Matlab/Simulink, and the calculated value was compared with the experimental value. The maximum relative error does not exceed 9.52%, indicating that the established mathematical model of pressure change is in good agreement with the test results, and the established mathematical model has high accuracy. Based on the positive pressure decay method, an experimental bench for leak detection of the fuel evaporation system was built, and the influence of different initial pressures and fuel volumes on the leak detection process of the fuel evaporation system under two leak hole diameters of 1 mm and 0.5 mm was studied. The results show that different initial pressures correspond to different decay rates. The greater the initial pressure is, the higher the pressure decay rate becomes. The higher the pressure decay rate is, the clearer the signal is, which is more conducive to leak detection. The fuel volume has a great influence on the pressure decay process, especially when the fuel volume is 80%, the difference in fuel volume is also 30%, and the pressure difference between 50% and 80% fuel volume is much larger than that between 20% and 50% fuel volume. Therefore, it is more important to select the appropriate range of fuel volume when conducting leak detection of fuel evaporation system.
The evaporative emission and leak of vehicle fuel cause serious pollution to the environment. In order to find out the main influencing factors of the leak detection process of vehicle fuel evaporation system, the leak process and main influencing factors of vehicle fuel evaporation system were studied by means of simulation calculation and experimental research. The leak detection model of fuel evaporation system was established. The pressure decay process was simulated and calculated by Matlab/Simulink, and the calculated value was compared with the experimental value. The maximum relative error does not exceed 9.52%, indicating that the established mathematical model of pressure change is in good agreement with the test results, and the established mathematical model has high accuracy. Based on the positive pressure decay method, an experimental bench for leak detection of the fuel evaporation system was built, and the influence of different initial pressures and fuel volumes on the leak detection process of the fuel evaporation system under two leak hole diameters of 1 mm and 0.5 mm was studied. The results show that different initial pressures correspond to different decay rates. The greater the initial pressure is, the higher the pressure decay rate becomes. The higher the pressure decay rate is, the clearer the signal is, which is more conducive to leak detection. The fuel volume has a great influence on the pressure decay process, especially when the fuel volume is 80%, the difference in fuel volume is also 30%, and the pressure difference between 50% and 80% fuel volume is much larger than that between 20% and 50% fuel volume. Therefore, it is more important to select the appropriate range of fuel volume when conducting leak detection of fuel evaporation system.
<div class="section abstract"><div class="htmlview paragraph">In allusion to the dynamic leak phenomenon caused by the fuel sloshing in the dynamic driving process of vehicle, the dynamic leak detection method was proposed based on the analysis of the dynamic leak mechanism and influencing factors. The six degree of freedom platform was used to simulate the gesture change of fuel tank during driving process. The influence of fuel tank operating conditions and different design styles on dynamic leak were mainly studied. Fiber-optic gyroscope was used to acquire the operating conditions of the fuel tank during driving process in five regions of China: Wuxi Mountain in Anhui, Hongjing Road in Beijing, Jing’anyi in Yunnan, Wuzhi Mountain in Hainan, Gele Mountain in Chongqing. Signal acquired by fiber-optic gyroscope includes the acceleration of the vehicle in the three directions of forward and backward, left and right, up and down as well as the rotation angles around these three directions. The displacement signal after integral reconstruction and angle signal jointly constitutes the operating conditions of fuel tank in different regions. As a comparison, South Mountain operating condition in the United States was also used for analysis. Small type, flat type, L type, saddle type and longitudinal strip type fuel tanks were selected as research objects. The six degree of freedom platform was used to simulate the gesture change of fuel tank during driving process. The result shows that the operating condition of South Mountain in the United States is quite different from those of five regions in China. Among the fuel tank operating conditions in China, the total dynamic leak amount of Wuxi Mountain operating condition in Anhui is the largest, and the leak rate result shows that L type fuel tanks are more prone to dynamic leak. Finally, according to the test results, the best dynamic leak detection operating conditions for fuel tanks with different design styles are proposed.</div></div>
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