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Automotive manufacturers and engineers have paid attention to promoting engine performance with low emissions satisfying many emission regulations. With such goals in mind, we have investigated new cooling strategies such as high coolant temperature control, fast warm-up and post cooling using an automotive cooling system controlled by electronic actuators. The cooling system in a 2.7 liter HSDI engine was modified for the purpose of this study, and an engine experiment was carried out on a New European Drive Cycle (NEDC). The conventional water pump was decoupled from the engine and electronically controlled by a BLDC motor. Valves were installed at the coolant pathways between the engine and cooling components. Overall, this modification led to a reduction in both fuel consumption and exhaust gas emissions (e.g. THC, CO). The reduction was particularly considerable at the low speed and low load-drive conditions by controlling high temperature of the coolant.

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.