不同道路条件下汽车恒速下坡控制仿真研究
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摘要
实现汽车恒速下坡控制对于提高汽车运输效率和安全性具有重要意义。针对加装液力缓速器汽车恒速下坡控制的特点,通过分析汽车下坡缓速制动过程,建立汽车下坡缓速器制动仿真模型。根据缓速器缓速制动原理设计了基于Matlab/Stateflow逻辑控制的恒速控制器,在Matlab/Simulink中选取混凝土、卵石、砂石等不同路面条件对汽车恒速下坡过程进行仿真分析,得出了充液率调节值对车速变化的影响关系,得到了汽车在不同路面条件下实现恒速制动的充液率合理调节取值。仿真结果表明液力缓速器单独作用于汽车制动可以实现恒速下坡控制,路面条件与液力缓速器充液率调节值大小对恒速控制性能有着重要的影响。
It is of great significance for improving efficiency and safety of vehicle transport to achieve constant speed downhill control of vehicle. Aiming at the characteristics of constant speed downhill control with hydraulic retarder,the braking simulation model of vehicle downhill retarder was established through analyzing the slow braking process of vehicle downhill. According to the braking principle of retarder,a constant speed controller based on Matlab/Stateflow logic control was designed. In Matlab/Simulink,different road conditions such as concrete,pebble and gravel were selected to simulate and analyze the process of automobile constant speed downhill. The influence of the adjusting value of liquid filling rate on the change of vehicle speed was obtained,and the reasonable value of filling rate for realizing constant speed braking under different road conditions was obtained. The simulation results show that the hydraulic retarder acting alone on the brake of the vehicle can achieve constant speed downhill control. The pavement conditions and the adjustable value of the hydraulic retarder filling rate have an important impact on the constant speed control performance.
It is of great significance for improving efficiency and safety of vehicle transport to achieve constant speed downhill control of vehicle. Aiming at the characteristics of constant speed downhill control with hydraulic retarder,the braking simulation model of vehicle downhill retarder was established through analyzing the slow braking process of vehicle downhill. According to the braking principle of retarder,a constant speed controller based on Matlab/Stateflow logic control was designed. In Matlab/Simulink,different road conditions such as concrete,pebble and gravel were selected to simulate and analyze the process of automobile constant speed downhill. The influence of the adjusting value of liquid filling rate on the change of vehicle speed was obtained,and the reasonable value of filling rate for realizing constant speed braking under different road conditions was obtained. The simulation results show that the hydraulic retarder acting alone on the brake of the vehicle can achieve constant speed downhill control. The pavement conditions and the adjustable value of the hydraulic retarder filling rate have an important impact on the constant speed control performance.
引文
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[9]余志生.汽车理论[M].北京:机械工业出版社,2011.
[10]梁国华,钱国敏,李瑞,等.基于安全与效率的交通事件下高速公路长大下坡限速值[J].中国公路学报,2015,28(5):117-124.
[2]黄俊刚,李长友,童军,等.液力缓速器制动扭矩的关键影响因素分析[J].机床与液压,2010,38(15):77-80.
[3]贾云海.张文明.杨珏,等.液力缓速器制动过程动态仿真研究[J],汽车技术.2009,10(7):26-30.
[4]张玉玺,程秀生,李辉,等.基于模糊逻辑的液力减速器智能控制的研究[J].昆明理工大学学报(自然科学版),2007,32(5):14-17.
[5]陆中华,程秀生.液力缓速器恒速控制策略的仿真研究[J].汽车技术,2009(11):1-3.
[6]李淑梅,罗卫东,柳慧谱.汽车恒速下坡用水液力缓速器控制策略研究[J].计算机测量与控制,2015,23(3):777-779.
[7]李玉生.重型汽车发动机排气辅助制动效能的分析研究[J].重型汽车,1998(3):15-17
[8]李文辉,高权均,魏宏,等.发动机辅助制动作用及其对汽车制动性能的影响[J].内燃机工程,2002,23(4):25-27
[9]余志生.汽车理论[M].北京:机械工业出版社,2011.
[10]梁国华,钱国敏,李瑞,等.基于安全与效率的交通事件下高速公路长大下坡限速值[J].中国公路学报,2015,28(5):117-124.