国三国四排放发动机用涡轮增压器概述.ppt

康跃增压器 康跃增压器 Euro III was the start of serious emissions reductions. Initial reactions from European engine manufacturers in the 1998-1998 timeframe was that they would need to implement EGR. EGR was seen as effective at NOx reduction, but the impact on engine life was extremely concerning. A lot of experience was gained by European manufacturers with EGR, but they were all able to meet Euro III without EGR. Basic combustion improvement was sufficient to meet the requirements. 欧3标准是更严格排放的开始。在1998年至1998年期间欧洲发动机制造商最初意识到需要实施废气再循环。废气再循环能有效减少氮氧化物的排放，但与发动机的寿命是极为相关。一些有丰富的经验，获得废气再循环技术的欧洲制造商，他们都能够满足欧洲III无废气再循环。基本燃烧改善足以满足发动机的需求。 Serious research on alternative combustion schemes such as Homogeneous Charge Compression Ignition (HCCI), Pre-mixed Charge Compression Ignition (PCCI), Low Temperature Combustion (LTC) began at this time. In addition, NOx reducing after-treatment research was significantly increased resulting in significant improvement in Lean NOx Traps (LNT), Selective Catalytic Reduction (SCR), and Lean NOx Catalysts. 认真研究替代燃烧的计划，如均质充气压缩点燃方式（ HCCI燃烧） ，预混合混合燃烧（ PCCI ） ，低温燃烧（中校）开始使用。此外，处理后氮氧化物减少有了很大的改善，氮氧化合物捕集器 （ LNT ） ，选择性催化还原（ SCR ） ，氮氧化物和精益催化剂。 At about the same time, the Department of Justice in the U.S. determined that the advanced electronic controls that U.S. manufacturers had implemented to meet 1998 standards violated the intent of the law. Many manufacturers were sued and reached an out-of-court settlement with the EPA (referred to as the Consent Decrees) which required them to meet 2004 standards in 2002, AND without any transient controls that could be viewed as “cycle-beating”. This shortened time-frame combined with a required switch in strategy caused significant upheaval in the industry. Most engine manufacturers launched EGR systems for the first time in this period. They learned to control the pressure differential across the engine to control EGR flow, as well as learned about the effects of EGR on engine life. They learned the boundaries where co