汽车工程 ›› 2023, Vol. 45 ›› Issue (1): 104-111.doi: 10.19562/j.chinasae.qcgc.2023.01.012

所属专题: 底盘&动力学&整车性能专题2023年

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基于道路行驶工况辨识的重型载货汽车排气制动系统主动控制研究

史培龙1(),赵轩1,陈子童2,余强1   

  1. 1.长安大学汽车学院,西安 710064
    2.北京理工大学机械与车辆学院,北京 100081
  • 收稿日期:2022-07-12 修回日期:2022-08-08 出版日期:2023-01-25 发布日期:2023-01-18
  • 通讯作者: 史培龙 E-mail:peilongshi@chd.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(52172361);榆林市科技计划项目(CXY-2020-021);中央高校基本科研业务费专项资金(300102222201)

Study on Active Control of Exhaust Brake System for Heavy-duty Truck Based on Road Driving Condition Recognition

Peilong Shi1(),Xuan Zhao1,Zitong Chen2,Qiang Yu1   

  1. 1.School of Automobile,Chang'an University,Xi'an 710064
    2.School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081
  • Received:2022-07-12 Revised:2022-08-08 Online:2023-01-25 Published:2023-01-18
  • Contact: Peilong Shi E-mail:peilongshi@chd.edu.cn

摘要:

针对长下坡路段行驶的重型载货汽车因驾驶人路况不熟悉而行车制动系统使用不当引发制动器热衰退风险的问题,本文提出了基于道路行驶工况辨识的重型载货汽车排气制动系统主动控制策略。考虑到山区路段道路纵向坡度信息难准确获取,且制动踏板动作特征与其他路段存在显著的差异,文中选取时间窗内制动踏板平均开度、持续作用时间和制动踏板作用时间比例分别建立了下坡路段行驶制动工况和其他路面制动工况,利用制动踏板动作与开启排气制动系统的因果关系建立了具有连续时间序列特性隐马尔可夫模型。考虑到时间窗长度对控制效果的影响,文中建立时间窗长度为30、60、90和120 s的4种模型,利用京昆高速雅安-西昌段K25-K174左线和右线试验数据进行离线训练和在线辨识验证。道路试验和仿真结果表明:文中提出的控制策略能够准确辨识车辆行驶工况,能够实现排气制动系统主动控制,降低了对驾驶人的高度依赖,从而提高了重型载货汽车下坡路段行驶安全性。

关键词: 汽车工程, 重型载货汽车, 行驶工况, 隐马尔可夫模型, 主动控制

Abstract:

For the problem of improper use of the service brake system due to unfamiliarity of the driver with the road conditions of heavy truck driving on long downhill sections, which leads to the risk of brake thermal degradation, this paper proposes an active control strategy of the exhaust brake system of heavy-duty trucks based on the identification of road driving conditions. Considering the difficulty of accurately obtaining the longitudinal gradient information of the road in mountainous areas and different characteristics of brake pedal action compared with other road sections, this paper selects the average brake pedal opening range in the time window, the continuous working time and the ratio of the brake pedal working time to construct the driving braking conditions on downhill sections and other road braking conditions. Then the hidden Markov model with continuous time series characteristics, including time window lengths of 30, 60, 90 and 120 s, are established by the causal relationship between the brake pedal action and the opening of the exhaust brake system. And off-line training and on-line identification verification are carried out using the test data of K25-K174 in the Ya’an-Xichang section of Jingkun Expressway. The road test and simulation results show that the control strategy proposed in this paper can accurately identify the driving conditions of the vehicle, realize the active control of the exhaust brake system, reduce the high dependence on the driver, and improve the driving safety of heavy-duty trucks on downhill sections.

Key words: automotive engineering, heavy-duty truck, driving cycle, hidden Markov model, active control