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INTRODUCTION TO DIESEL EXHAUST AFTERTREATMENT
| 题名： | INTRODUCTION TO DIESEL EXHAUST AFTERTREATMENT |
| 正文语种： | eng |
| 作者： | BRENT DELFEL |
| 作者单位： | Advanced Diagnostic Consulting |
| 摘要： | Do you know how the exhaust aftertreatment system in the diesel internal combustion engine came to be? Before we can reveal the answer, we first must understand what occurs inside the combustion chamber: The air charge enters the cylinder during the induction stroke. The air is typically pushed into the cylinder (during the intake stroke) under forced induction, referred to as turbocharging. Forcing the air charge (under pressure) into the cylinder allows for greater cylinder pressure. The fuel is injected at a specific time right into the cylinders, typically by a common rail fuel injector. In many cases, both the fuel injection system and the turbocharger system are managed by an ECU. The cylinder charge air is comprised of about 21 percent oxygen and about 78 percent nitrogen (as well as some trace gases insignificant to the combustion process). It's this combination of the fuel and the heat created from the compressed cylinder air charge that initiates the combustion process. Because the air charge contains oxygen, a chemical reaction occurs within the combustion chamber during this combustion process. Said another way, the oxygen, heat, and fuel start a chemical reaction - the result is fire (Figure 1). |
| 出版年： | 2022 |
| 期刊名称： | Motor age |
| 卷： | 141 |
| 期： | 5 |
| 页码： | 22,24,26,28-29 |
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