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Two or more aftertreatment systems will be required for diesel vehicles to reduce PM and NOx, simultaneously and achieve the same levels of exhaust emissions as gasoline vehicles. Thus, aftertreatment devices such as the DPF and DeNOx catalyst need to be compact and less restrictive to exhaust gas flow. An IP Filter for removing particulate in exhaust gas has been developed to reduce both unit size and pressure drop and structured to integrate the DOC and DPF functions into one unit. A conventional wall-flow DPF has a cellular structure with either individual open-end or closed-end channels on both the inlet and outlet sides. The IP Filter has no plugs on the front end but has plugs at the interface of the DOC and DPF parts (internal plugs) in addition to the plugs at the rear end. Several test IP Filters that were made of highly porous cordierite material were prepared for testing to evaluate their performance characteristics.

This newly developed 1.6L engine achieves, in comparison with a conventional engine, an 7% reduction in fuel consumption in stoichiometric operation, by improving combustion through modification of the shape of the intake port and combustion chambers, and by adopting friction-reducing technologies. Also, the adoption of a high-density, thin-walled catalyst (900 cells, 2.5 mil unit) and early activation of the catalyst through catalyst quick warm-up control, makes it possible to comply with Euro4 gas emission standards by reducing emissions in cold start and immediately thereafter.

A four-track steering vehicle(4TS) is a new concept of off-road vehicles the tires of which have been replaced with tracks to improve mobility on a soft terrain. In this paper, a theoretical model to predict the steerability and mobility of the vehicles has been developed and the validity of the theoretical model is verified by the scale model and real vehicle tests. From the results of numerical analysis and experiments, it is found that the required driving force and track slip sinkage for steering are small noticeably as compared with those existing tracked vehicles, and so the mobility of a four tracked steering vehicle will be improved on soft terrain, especially, on snow surface.