发动机泄气制动过程数值模拟及其性能优化研究
发布时间：2018-08-14 10:46
【摘要】：随着交通道路的改善及汽车大型化，汽车速度及载重能力得到了很大提高，现代汽车对制动性能提出了越来越高的要求,在现代商用车特别是大型商用车上增加辅助制动装置已成为一种趋势甚至成为硬性规定，发动机泄气制动作为一种重要的辅助制动系统，在国外已有较多应用，它大大增加了行车安全性。由于国外对先进技术及资料的保密，国内对辅助制动能力利用水平一直停留在排气制动阶段，对制动效果更好制动性能更优的泄气式辅助制动的研究、生产和应用还处于起步阶段，对泄气制动性能也缺乏系统的研究。 本文在国内外对发动机辅助制动技术研究的基础上，对发动机泄气式辅助制动的相关技术进行了深入的分析和研究。运用三维数值模拟与实验相结合的方法对发动机泄气式辅助制动的工作过程及制动性能进行了研究，不但显示了活塞压力的变化过程，而且得出了各状态下平均制动功率的大小，，通过优化工作参数提高了制动性能，最后利用台架试验验证了模拟方法的正确性，为将来开发具有自主知识产权且制动性能优良的泄气制动器提供参考依据。 本文以校企合作项目为依托，对发动机泄气式辅助制动进行了研究。论文的主要研究工作和创新之处如下： （1）建立了发动机泄气制动数学模型，并根据某发动机原型建立了三维模型，对发动机泄气制动过程进行了三维数值模拟，研究了发动机泄气制动工作时活塞压力及发动机泄气制动功率的变化情况。 （2）通过数值模拟分析了相关参数（包括排气门开度、发动机转速和排气背压等）对活塞受力及发动机泄气制动性能的影响。对泄气制动装置关键部件进行了受力与可靠性分析，保证在制动性能优化过程中相关制动机构不会破坏。 （3）对数值模拟结果进行了实验验证，结果表明：实验值与模拟值误差很小，模拟计算方法合理，结果可信。模拟方法和结论可用于发动机泄气制动的相关设计和性能研究。根据研究结果提出了提高发动机泄气制动性能的方案，通过优化相关参数提高发动机泄气制动性能。
[Abstract]:With the improvement of the traffic road and the large-scale automobile, the vehicle speed and load capacity have been greatly improved, and the modern automobile has put forward more and more high requirements for the braking performance. It has become a trend to add auxiliary braking devices to modern commercial vehicles, especially in large commercial vehicles. As an important auxiliary braking system, engine exhaust braking has been widely used abroad. It greatly increases the safety of driving. Because of the secrecy of advanced technology and data in foreign countries, the utilization level of auxiliary braking capacity in China has been staying at the stage of exhaust braking, and the research on the exhaust auxiliary brake with better braking effect and better braking performance has been carried out in our country. The production and application are still in the initial stage, and there is a lack of systematic research on the performance of deflated braking. Based on the research of engine auxiliary braking technology at home and abroad, this paper makes a deep analysis and research on the relevant technology of engine exhaust auxiliary brake. The working process and braking performance of engine exhaust auxiliary brake are studied by using the method of three-dimensional numerical simulation and experiment, which not only shows the process of piston pressure variation. Moreover, the average braking power in each state is obtained, and the braking performance is improved by optimizing the working parameters. Finally, the correctness of the simulation method is verified by the bench test. It provides a reference for the future development of deflator brake with independent intellectual property rights and excellent braking performance. In this paper, based on the school-enterprise cooperation project, the engine exhaust auxiliary brake is studied. The main research work and innovations are as follows: (1) the mathematical model of engine exhaust braking is established, and a three-dimensional model is established according to an engine prototype, and the three-dimensional numerical simulation of engine exhaust braking process is carried out. The variation of piston pressure and engine exhaust brake power during engine exhaust braking is studied. (2) the relevant parameters (including the opening of exhaust valve) are analyzed by numerical simulation. The influence of engine speed and exhaust back pressure on the piston force and the performance of engine exhaust brake. The stress and reliability analysis of the key parts of the deflating braking device are carried out to ensure that the relevant braking mechanism will not be destroyed in the process of braking performance optimization. (3) the experimental results are verified by the numerical simulation results. The results show that the error between the experimental value and the simulated value is very small, the simulation calculation method is reasonable and the results are credible. The simulation method and conclusion can be used in the design and performance study of engine exhaust brake. According to the research results, a scheme to improve the performance of engine exhaust braking is put forward, and the performance of engine exhaust braking is improved by optimizing the relevant parameters.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U463.5;U467
[Abstract]:With the improvement of the traffic road and the large-scale automobile, the vehicle speed and load capacity have been greatly improved, and the modern automobile has put forward more and more high requirements for the braking performance. It has become a trend to add auxiliary braking devices to modern commercial vehicles, especially in large commercial vehicles. As an important auxiliary braking system, engine exhaust braking has been widely used abroad. It greatly increases the safety of driving. Because of the secrecy of advanced technology and data in foreign countries, the utilization level of auxiliary braking capacity in China has been staying at the stage of exhaust braking, and the research on the exhaust auxiliary brake with better braking effect and better braking performance has been carried out in our country. The production and application are still in the initial stage, and there is a lack of systematic research on the performance of deflated braking. Based on the research of engine auxiliary braking technology at home and abroad, this paper makes a deep analysis and research on the relevant technology of engine exhaust auxiliary brake. The working process and braking performance of engine exhaust auxiliary brake are studied by using the method of three-dimensional numerical simulation and experiment, which not only shows the process of piston pressure variation. Moreover, the average braking power in each state is obtained, and the braking performance is improved by optimizing the working parameters. Finally, the correctness of the simulation method is verified by the bench test. It provides a reference for the future development of deflator brake with independent intellectual property rights and excellent braking performance. In this paper, based on the school-enterprise cooperation project, the engine exhaust auxiliary brake is studied. The main research work and innovations are as follows: (1) the mathematical model of engine exhaust braking is established, and a three-dimensional model is established according to an engine prototype, and the three-dimensional numerical simulation of engine exhaust braking process is carried out. The variation of piston pressure and engine exhaust brake power during engine exhaust braking is studied. (2) the relevant parameters (including the opening of exhaust valve) are analyzed by numerical simulation. The influence of engine speed and exhaust back pressure on the piston force and the performance of engine exhaust brake. The stress and reliability analysis of the key parts of the deflating braking device are carried out to ensure that the relevant braking mechanism will not be destroyed in the process of braking performance optimization. (3) the experimental results are verified by the numerical simulation results. The results show that the error between the experimental value and the simulated value is very small, the simulation calculation method is reasonable and the results are credible. The simulation method and conclusion can be used in the design and performance study of engine exhaust brake. According to the research results, a scheme to improve the performance of engine exhaust braking is put forward, and the performance of engine exhaust braking is improved by optimizing the relevant parameters.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U463.5;U467
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