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故障现象一辆2007年产的奇瑞旗云轿车,搭载1.6 L发动机和CVT变速器,因定速巡行系统无法工作而进厂检修。故障诊断接车后试车验证故障,当车速超过45 km/h时启动定速巡行系统,车辆无法保持车速,同时发现仪表上的定速巡行指示灯闪烁(图1)。查阅相关资料可知,在发动机功率允许的情况下,开启定速巡行系统可使车辆以高于45 km/h的某一速度稳定行驶。该车的定速巡行系统受发动机ECU控制,其控制电路如图2所示。根据电路图进行分析可知,定速巡行系统失效的原因可能是发动机ECU故障;定速巡行开关故障;制动开关故障;定速巡行模块故障及相关线路存在故障等。
Trouble A 2007 Chery Cowin sedan, equipped with 1.6L engine and CVT transmission, due to speed cruising system unable to work into the factory overhaul. Troubleshooting After the car is parked, the car is tested for failure. When the car speed exceeds 45 km / h, the cruise control system is activated and the vehicle can not maintain the vehicle speed. At the same time, the cruise control indicator on the meter blinks (Figure 1). Access to relevant information shows that, with engine power allowed, turning on the cruise control system can make the vehicle run steadily at a speed higher than 45 km / h. The car’s cruise control system by the engine ECU control, the control circuit shown in Figure 2. According to the analysis of the circuit diagram, it can be seen that the cause of the failure of the cruise control system may be engine ECU failure; cruise control switch failure; brake switch failure; cruise control module failure and related line fault.