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故障现象一辆新途观车,客户反映贴防爆膜后第2天仪表盘上的黄色EPS(电动助力转向系统)灯点亮,继续使用后发现该黄色EPS灯亮起后自动熄灭,此后灯时亮时灭,反反复复,而且天冷或早上车辆故障出现的频率较高,但车辆使用中并没有发现转向变沉重的问题。进厂检查没有发现异常,车辆各系统自诊断无故障代码。故障诊断参照维修资料,途观车电动助力转向系统具有自诊断、仪表报警等功能,故障灯分为红、黄双色灯。当车辆转向系统出现偶发性故障,如蓄电池电压过低和转向角度传感器没有匹配时,点亮黄色的EPS灯,此时系统仍能正常提供转向助力;当车辆转向系统出现损伤性、机械性或 相似文献
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本文围绕轿车悬架故障的检测与诊断展开研究,通过对悬架常见故障的机理分析,结合大量实车试验和维修实例,根据现场诊断的操作步骤,绘制悬架系统不同故障的诊断流程,在此基础上建立悬架故障诊断系统。该系统采用实验测试参数分析与专家意见相结合的方式,用户只需根据系统提示进行简单操作,即可实现快速诊断悬架故障的目的。为了验证该系统的可行性,开发者对大量故障实例进行了检测,将系统检测结果与人工检测结果进行比对后证实两者具有较强的一致性。 相似文献
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为了验证基于HIL(Hardware-In-the-Loop,硬件在环)的EPS(Electric Power Steering,电动助力转向)系统功能故障和电气故障测试的准确性,以及自动化测试的可靠性,首先根据EPS动力学模型及HIL测试系统结构,建立EPS系统仿真模型及搭建HIL测试台架,再以EPS系统高电压功能故障和扭矩传感器短地故障为例,进行故障诊断及自动化测试.结果 表明:基于硬件在环的EPS系统故障诊断测试,可以替代实车进行测试验证,使用自动化测试可提高复测性及工作效率,为EPS系统诊断测试方法提供参考. 相似文献
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故障现象:该车助力系统失效,转向沉重。
故障诊断:广本飞度在转向机构上更新了技术,采用电动转向EPS系统,拥有一套独立的电子控制装置。[第一段] 相似文献
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为实现电动助力转向系统(EPS)的状态监测和关键故障诊断,本文中引入基于模型的结构分析法(SA)故障诊断理论,结合EPS数学模型和系统关键故障,建立系统故障数学模型;利用SA方法中的系统结构表征、DM分解和故障隔离矩阵分析其故障的可检测和可隔离性,获得EPS故障诊断系统最优传感器配置,并得到5组结构最小型超定方程集(MSO sets);设计5组MSO残差,并搭建MATLAB/Simulink故障诊断系统模型,检验5组残差的信号特征和故障状态,验证EPS故障诊断设计系统的有效性,为后续的试验验证奠定基础。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):331-350
This paper presents an integrated structure for a passive and active fault tolerant control (FTC) design approach in the framework of a robust nonlinear control technique called Dynamic Surface Control (DSC). As motivated by the automated vehicle application, we consider two categories of possible faults: pre-specified (a priori) and non-specified faults. It is first shown that DSC can be considered as a passive FTC approach in the sense that it gives simultaneous robust stability to a set of nonlinear systems even in the presence of model uncertainties and the pre-specified faults. Then, the non-specified fault is classified depending on the fault’s impact on the closed-loop system and isolatability from a fault detection and diagnosis (FDD) system. If a fault is both intolerable and isolatable, an active FTC approach is taken which includes FDD and controller reconfiguration. More specifically, trajectory reconfiguration is considered to accommodate the actuator fault, i.e., to compensate for the performance loss due to the fault within the framework of a switched hierarchical structure. Finally, the integrated structure for the longitudinal control of an automated transit bus is designed through the proposed method. Simulation results of the fault tolerant controller are shown for both single and multiple multiplicative faults. This controller was implemented on the California PATH transit buses in a demonstration of automated public transportation technology in San Diego, California in August of 2003. 相似文献
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介绍了蓝鸟系列轿车ABS自诊断系统中故障诊断以及故障码的读取与清除方法。在介绍ABS常见典型故障的基础上,分析了如何根据故障码进行传感器、执行器电磁阀、ABS电动机继电器、ABS控制元件以及系统低电压的故障诊断方法,论述了常见的故障现象以及诊断程序,给出了系统维修数据。 相似文献
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This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control
of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to
optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults
in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may
result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple
processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However,
its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate
the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed
and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method
is validated experimentally via field tests of an ATV. 相似文献
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汽车EPS系统可靠性Fuzzy评价研究 总被引:1,自引:0,他引:1
在对汽车EPS系统故障进行分析的基础上,建立以Fuzzy理论为基础评价EPS系统可靠性的模糊综合评价模型,提出一种评价EPS系统可靠性的方法,为汽车EPS系统故障诊断提供依据。 相似文献
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Chunsheng Li Shihui Luo Colin Cole Maksym Spiryagin Yanquan Sun 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(12):1807-1822
This paper proposes a signal-based fault detection and isolation (FDI) system for heavy haul wagons considering the special requirements of low cost and robustness. The sensor network of the proposed system consists of just two accelerometers mounted on the front left and rear right of the carbody. Seven fault indicators (FIs) are proposed based on the cross-correlation analyses of the sensor-collected acceleration signals. Bolster spring fault conditions are focused on in this paper, including two different levels (small faults and moderate faults) and two locations (faults in the left and right bolster springs of the first bogie). A fully detailed dynamic model of a typical 40t axle load heavy haul wagon is developed to evaluate the deterioration of dynamic behaviour under proposed fault conditions and demonstrate the detectability of the proposed FDI method. Even though the fault conditions considered in this paper did not deteriorate the wagon dynamic behaviour dramatically, the proposed FIs show great sensitivity to the bolster spring faults. The most effective and efficient FIs are chosen for fault detection and classification. Analysis results indicate that it is possible to detect changes in bolster stiffness of ±25% and identify the fault location. 相似文献