Nissan's emission control systems to meet Japanese automotive emissions standards
by M. Onoda
International Journal of Vehicle Design (IJVD), Vol. 1, No. 5, 1980

Abstract: The Nissan Motor Company introduced the Nissan Anti-Pollution System (NAPS) in 1975 in response to a tightening of the Japanese emission control standards. The more stringent standards of 1978, requiring an NOx reduction of at least 80%, made a further improvement of NAPS necessary. To effect this improvement Nissan carried out a series of studies. The stabilisation of combustion and the effective induction of heavy exhaust gas re-circulation (EGR) were studied with the aim of reducing NOx with a heavy EGR. A study of a three-way catalyst system was also made with a view to reducing NOx after emission from the cylinder. As a result of these studies, Nissan's models were equipped with the three most appropriate NAPS systems. These systems are described.

Online publication date: Sun, 25-May-2014

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