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奥迪A6L高速缺火故障怎么维修

来源:http://www.sdjnltqf.com发布时间:2019-04-12 17:13:49

  一辆行驶里程仅1.7万KM的奥迪A6L/ 2.0T轿车,车速达到 130km/h时出现失火现象。
  An Audi A6L/2.0T car with a driving mileage of only 17,000 KM caught fire when its speed reached 130 km/h.
  奥迪A6L/ 2.0T由于排放标准高,发动机控制单元时刻监测各缸工作状态。一 旦发现某缸存在工作不良次数超过设定值,就会点亮废气灯;同时会对失火汽缸进行断油,以免损坏三元催化器和排放超标。
  Due to the high emission standard of Audi A6L/2.0T, the engine control unit monitors the working status of each cylinder at all times. Once a cylinder is found to be working badly more than the set number of times, the exhaust lamp will be lit; at the same time, the misfire cylinder will be oil-cut, so as to avoid damage to the ternary catalytic converter and emissions exceeding the standard.
  技师诊断思路:
  Technician diagnostic thinking:
  连接诊断仪检查显示:P0300/多缸失火和P0304/4缸失火的故障记忆。清除故障码后高速试车,发现当车速超过 120km/h时,转向盘和车身有明显的抖动现象,但数据流显示此时还没有出现失火现象。
  Connection diagnostic instrument inspection showed: P0300/multi-cylinder fire and P0304/4 cylinder fire fault memory. After clearing the fault code, the high-speed test found that when the speed exceeded 120 km/h, the steering wheel and body had obvious jitter phenomenon, but the data stream showed that there was no fire phenomenon at this time.
  继续行驶当车速达到130km/h 时,在数据流16组出现4缸有失火现象。当失火次数超过24次后点亮废气灯,发动机明显出现断火现象。
  When driving at 130 km/h, 4 cylinders in 16 groups of data flow will catch fire. When the number of ignition exceeds 24 times, the exhaust lamp is lit, and the engine is obviously cut off.
  熄火重新启动后,故障不再出现,直到车速超过120km/h又出现。
  When the flameout is restarted, the fault does not occur until the speed exceeds 120 km/h.
  厂家对失火的检查指引如下:
  The manufacturer's Inspection Guidelines for fire are as follows:
  ①各缸压缩比相关较大。
  (1) Compression ratio of each cylinder has a great correlation.
  ②某缸点火能量不足(含火花塞、点火线圈以及电源和搭铁)。
  (2) The ignition energy of a cylinder is insufficient (including spark plug, ignition coil, power supply and tapping).
  ③各缸空燃比相关较大(喷油器堵塞或是泄漏)。
  (3) The air-fuel ratio of each cylinder is highly correlated (blockage or leakage of injector).
  ④燃油品质不良。
  (4) The fuel quality is poor.
  ⑤控制单元软件判断错误。
  Control unit software judgement error.
  ⑥外部存在电磁干扰。
  _External electromagnetic interference exists.
  检查火花塞,由于行驶里程都很短,火花塞燃烧良好。
  Check the spark plug, because the driving mileage is very short, the spark plug burns well.
  测量汽缸压力,4缸在11. 7Bar,而且各缸压差也较小。
  Measuring cylinder pressure, 4 cylinders in 11.7 Bar, and each cylinder pressure difference is also small.
  分析是否有可能是燃油品质引故喷油器工作不良导致发生高速失火, 但客户反映他们单位有 同样的车辆,也在同一油站加油并没有出现这样的故障。
  It was analyzed whether it was possible that the poor performance of the injector caused high-speed fire due to fuel quality, but customers reported that they had the same vehicles in their unit and that there was no such failure at the same gas station.
  将2缸和4缸喷油器对调,再次试车仍然是4缸失火。
  After adjusting the two cylinders and four cylinders of injectors, the fire of the four cylinders will still occur in the second test run.
  虽然发动机控制单元也有可能导致产生这种故障,但发动机控制单元 并不是一个易损件不能轻易更换。只能再次梳理思路,回想试车当车速超过120km/h故障还没有出现时,车辆已先出现了转向盘和车身抖动, 而这个故障一般是由于轮胎动平衡不良所造成。请加大师微信:qxzydzb
  Although the engine control unit may also cause such a failure, the engine control unit is not a vulnerable component that can not be easily replaced. Only to sort out the train of thought again, recall that when the fault of speed over 120 km/h has not appeared, the vehicle has appeared the steering wheel and body jitter first, and this fault is usually caused by the poor dynamic balance of tires. Please send me a letter from Master: qxzydzb
  虽然轮胎动平衡不会直接导致失火,但它会导致曲轴转速产生波动;而失火检测的方法一般是通过曲轴位置传感器和凸轮轴位置传感器,检测各缸工作时转过相同的曲轴转角所用的时间, 来和标准数据对比从而得出某缸失火结论。

                            济南奥迪汽车专修
  Although tire dynamic balance will not directly cause fire, it will cause the crankshaft speed fluctuation; and the method of fire detection is generally through the crankshaft position sensor and camshaft position sensor to detect the time spent by each cylinder turning the same crankshaft angle when working, and then compare with the standard data to draw a conclusion of a cylinder fire.
  将四条轮胎全部做了动平衡,再次高速试车,当车速超过120km/h时不再出现转向盘和车身抖动现象,且车超过 130km/h也没有再出现失火记录。
  The four tires were balanced dynamically and tested at high speed again. When the speed exceeded 120 km/h, the steering wheel and body jitter no longer appeared, and there was no fire record when the speed exceeded 130 km/h.
  客户接车半个月后,回访客户确认没有再出现故障。
  Half a month after receiving the bus, the customer returned to confirm that there was no further failure.
  总结:由于轮胎动平衡不良,导致发动机转速波动;发动机控制单元误以为失火,从而点亮废气灯并切断4缸供油。为什么这种情况只会报4缸失火?个人分析是由于4缸和变速器离得 最近,自然受轮胎(半轴)转速波动影响比较大。
  Summary: The engine speed fluctuates due to poor tire dynamic balance; the engine control unit mistakenly assumes that the engine is misfired, thus lighting the exhaust lamp and cutting off the four cylinders of fuel supply. Why does this only cause a 4 cylinder fire? Personal analysis is due to the fact that the four cylinders and gearbox are nearest to each other and are naturally affected by the fluctuation of tire (half-axle) speed.

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