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Emission reduction technologies for turbocharged engines

机译：涡轮增压发动机的减排技术

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It is projected that compliance with Japanese new exhaust emission regulations set to be enforced in 2000 year will be difficult for turbocharged engines with conventional technologies. This is mainly because of the delay in catalyst lightoff at engine start due to the lower exhaust gas temperature of turbocharged engines compared with that of their naturally aspirated counterparts. Compliance will be particularly difficult for V-6 engines on account of the large heat mass of the exhaust system, resulting in a slower temperature rise. Previously, improvement of hydrocarbon (HC) conversion rates following engine start depended solely on the low-temperature characteristic of the catalyst. The catalyst system described here adopts a completely new mechanism that traps HCs before the catalyst lights off and then desorbs them for conversion after the engine warms up. Implementation of this system overcomes the limitation on low-temperature catalyst activity, making it possible to reduce HC emissions from the time of engine start. Moreover, the close-coupled catalyst features a high cell density, ultra-thin metal substrate incorporating a new bonding method called diffused bonding. The combination of this 30mm-thick metal substrate with 600 cells and the above-mentioned HC trap significantly reduces HC emissions. This system makes it possible to achieve low emission levels for turbocharged engines, which has so far been difficult to accomplish. The adoption of these new technologies enables a turbocharged V-6 engine to meet Japanese 2000 exhaust emission standards.
机译：预计将符合日本新废排放法规在2000年度执行的符合符合传统技术的涡轮增压发动机难以遵守。这主要是因为由于涡轮增压发动机的较低的排气温度与其天然吸气的对应物相比，发动机的催化剂次数的延迟开始。根据排气系统的大量热量，V-6发动机将特别困难，导致较慢的温度升高。以前，发动机开始的烃（HC）转化率的改善仅依赖于催化剂的低温特性。这里描述的催化剂体系采用全新的机制，该机制在催化剂灯之前捕获HCS，然后在发动机升温后解吸它们进行转换。该系统的实施克服了对低温催化剂活性的限制，使得可以从发动机开始时减少HC发射。此外，近耦合催化剂具有高电池密度，超薄金属基板，其包含一种称为扩散键合的新粘合方法。该30mm厚的金属基材与600个细胞和上述HC阱的组合显着降低了HC排放。该系统使得可以实现涡轮增压发动机的低排放水平，这迄今为止难以实现。采用这些新技术使涡轮增压涡轮增压发动机能够满足日本的2000年排气标准。

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