A CONTRIBUTION TO ENGINE EMISSION CONTROL

The problem of air pollution from engine exhaust emissions is mainly considered as a result of todays higher standard living. Emission reduction from engines is the main target now. The levels of exhaust pollutants CO, HC and NOx are relatively high at starting and warming-up period. This paper deals mainly with this specific problem by means of heating the fresh charge directly after carburettor. This is done by means of additional heater mounted after carburettor. It depends upon the vehicle storage battary, or the like with respect to the stationary engines, as a source of electric power. The additional heater is occasionally used, according to the atmospheric temperature and at the preliminary warming-up period only. It is found, as a result of warming up of the fresh charge, that there is an improvement in polutant levels, CO% &HC within a charge temperature variation range of (18°C). This is due to improvement in homogenety of the mixture by good fuel evaporization. Also, as the temperature of fresh charge is increased, the fuel consumption decreased