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As the exhaustion of petroleum resources and air pollution problems are getting more serious day by day, demands for low emission levels and higher thermal efficiency of vehicle engines have been increased. In light of this, the diesel engine has many advantages such as high thermal efficiency, a cheaper price of fuel, and what is more it has a low CO2 exhaustion level well known as the factor of ‘Global Warming’, therefore the use of diesel engines is getting increased. However in the case of diesel engine, NOx increases in the local high temperature region, and particulate matter increases in fuel rich regions. That is why, getting down the peak temperature to reduce NOx emission and making better air-fuel mixing to minimize particulate matter formation are required and Homogeneous Charge Compression Ignition (HCCI) is a technique which can make those conditions.

Since environmental problems are getting serious, the worldwide are focused on exhaust emission from the vehicle. Many researchers have been performed to solve these problems in many ways. In this paper, we tried to reduce the emission by improving the traditional mechanical engine cooling systems which control the engine temperature with only engine speed and thermostat. The paper explained the improvement of emission by cooling system which is controlled by an electronic system based on the engine status.