Toyo Kogyo Status Report on Low Emission Concept Vehicles 720486
This paper describes the extensive effort and progress made by the Toyo Kogyo Company in developing emission control systems applicable to small vehicles with small displacement reciprocating engines, in order to achieve the very stringent targets established by the IIEC program.
Three concept emission package systems have been selected as showing promise to achieve the targets, and these packages have been under evaluation for emission performance and durability in the total vehicle systems, which were experimentally built.
These package systems incorporate component systems such as thermal reactors, EGR, catalytic converters, and other subcomponents to assist these main component systems.
Despite the effort made to date, none of these package systems have reached the stage of satisfying the HC/CO targets over extended vehicle mileage, or the NOx target, even at zero vehicle miles.
The durability of these package systems has been revealed as unsatisfactory. Frequent maintenance operations are required to adjust or replace the component devices in order to maintain very low emission levels during the course of the durability mileage.