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1.故障现象1台行驶里程只有5km的三一混凝土运输车,其配备的潍柴WP12.336N型柴油机工作中频繁发生冷却液温度过高报警故障。试车时发现,当满载行驶一段距离后,柴油机水温报警指示灯点亮。若继续行驶,柴油机故障指示灯也相继点亮。关闭柴油机,待冷却液温度降低后再次启动,故障现象重新出现。而该车空载或轻载时,故障现象出现频率较低。2.冷却系统工作原理该柴油机冷却系统配置了电控硅油离合器风扇,ECU根据设定的冷却液温度值来控制离合器的接合与分离,以达到调节风扇转速、控制冷却液温
1. Symptom 1 unit mileage of only 5km Trinity concrete truck, its equipped with Weichai WP12.336N-type diesel engine frequently occurs when the coolant temperature is too high alarm fault. Test found that when full load after a distance, the diesel engine temperature alarm light. If you continue to drive, diesel fault indicator lights have also been lit. Turn off the diesel engine and wait for the coolant temperature to decrease before starting again. The fault phenomenon reappears. When the car is empty or lightly loaded, the frequency of the failure phenomenon is lower. 2. Cooling system works The diesel engine cooling system is equipped with electric clutch silicone clutch, ECU according to set the coolant temperature value to control the clutch engagement and separation, in order to achieve the regulation of fan speed, coolant temperature control