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MISFIRE DETECTION STRATEGIES
| 题名： | MISFIRE DETECTION STRATEGIES |
| 正文语种： | eng |
| 作者： | BRANDON STECKLER |
| 摘要： | We have all likely been there before. Faced with a vehicle exhibiting what the En-gine Controller believes is a misfire.Some of us were lucky to realize that the ECU had misunderstood before the parts cannon was fired too many times.Troubleshooting the root cause of misfires should be an easy task, considering most gasoline internal combustion engines require only three factors to carry out a successful combustion event:1. Adequate ignition discharge (and at the proper time)2. Proper Air/Fuel ratio3. Cylinder mechanical integrity (compression and breathability)So, why is it so many techs struggle to solve the problem? Or worse, why are so many parts replaced unnecessarily? The answer likely lies with a lack of understanding of how the misfire is detected in the vehicle they are addressing. Contrary to popular belief, a misfire is not necessarily a cylinder lacking a combustion event. True, a lacking combustion event does indeed cause a misfire. But it is the slowing of the crankshaft that is the definition of a misfire. Anytime a cylinder fires and combustion take place, the nitrogen inside the air charge is heated by the combustion event. The heat causes the nitrogen gas to expand, and the pressure exhibited on top of the piston helps to propel it down and causes the crankshaft rotational velocity to increase.If there is a lack of adequate fuel supply, a combustion event will either cease to occur or it will not be as intense of an event as intended. Both possible scenarios will cause a slowing of the crankshaft and likely be flagged as a misfire. |
| 出版年： | 2022 |
| 期刊名称： | Motor age |
| 卷： | 141 |
| 期： | 9 |
| 页码： | 44-48,50 |
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