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Recently, the proportion of electronic components is increasing in the automotive vehicle. To protect electronic devices is extremely important in the car driving and maintenance. The fuse box of vehicle has functions to protect the circuit and device when the devices experience an excess current. Also, it is installed in the engine room of the vehicle and experience complex loads such like vibration from the ground, temperature from circumstance and electronic current. The objective of this study is to predict the fatigue lifetime of fuse box under complex environment such like vibration, electronic and heat load. To verify the simulation model of fuse box, various simulations to describe the physical test conditions were performed. And the results of simulation were compared with the test results. One single simulation model was used for the simulations in the different field problem.

The use of Exhaust Gas Recirculation (EGR) system has become a popular way for reducing NOx levels in internal combustion engine. Reducing NOx and PM emissions from diesel engine, and improving fuel consumption simultaneously are important in meeting government regulations and society needs. Recently, an important goal in diesel engine research is the development of means to reduce the emissions of NOx and PM. Cooled EGR system is one of the most effective techniques currently available for reducing NOx and PM emission in internal combustion. In particular, EGR system has the trade-off relation between NOx and PM emission, especially at high loads. In the present study, engine dynamometer experiments have been carried on the characteristics which improve heat exchange effectiveness of EGR cooler with shell & tube-type and stack-type.

An important goal in diesel engine research is the development of the means to reduce the emissions of nitrogen oxides (NOx) and particulate matter (PM). The use of a cooled exhaust gas recirculation (EGR) system is one of the most effective techniques currently available for reducing nitrogen oxides (NOx). However, a trade-off exists between the amount of NOx and PM emissions, especially at high engine loads. In the present study, we performed engine dynamometer experiments and numerical analyses to investigate how the internal shape of EGR coolers affects the heat exchange efficiency. Heat exchange efficiencies were examined for plain and spiral EGR coolers. The temperature and pressure distributions inside the EGR cooler were simulated in three dimensions using the commercial program FLUENT.