Development towards Serial Production of a Direct Injection Diesel Engine for Light-Duty Truck with Simultaneous Reduction of NOx and PM

Authors

A. Shoji, S. Kamoshita, T. Watanabe, T. Tanaka, Toyota Motor Corporation, Shizuoka; M. Yabe, Hino Motors Ltd., Tokyo

Year

2003

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 539

Summary

Toyota has developed the Simultaneous Reduction System of NOx and PM for installation on light-duty trucks. This system is built on an turbo charged with intercooler direct injection diesel engine. As its essential technologies, the system incorporates the Diesel Particulate and NOx Reduction (DPNR) system, common rail injection system, electronically controlled EGR system, highefficiency EGR cooler, and exhaust pipe injector supplying rich gas to the DPNR catalyst. The DPNR catalyst, which stores and reduces NOx, undergoes functional deterioration through mileage accumulation. This is a critical issue in applying DPNR to lightduty trucks. In order to investigate into this problem, we conducted an extended durability test spending 2000 hours on an engine test bed using light oil with sulfur content of 50ppm or less. In Japan D13 mode, the NOx reduction ratio of DPNR was 85% at the begining, which dropped to 50% after the durability test. However, even this level of NOx reduction capability shows sufficient potential for complying with future emission standards, such as Japan's new longterm regulations. This paper also suggests that the use of ultralow sulfur light oil, 10 ppm or less in sulfur content, is effective for further reduction of NOx emissions.

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