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Our paper describes our R&D results regarding thermal simulation of the electrical distribution box (EDB). We have developed simulation techniques by using the finite element method (FEM). In order to achieve a high level of accuracy in the thermal simulation, we built an appropriate model of the EDB. Because bus-bars and connectors with wires play important roles in the EDB, the bus-bars used in the model were exact replicas of those used in the EDB. As a result, a high accuracy, (± 5 degrees Celsius,) was achieved in the simulation. We simulated another EDB model using the same simulation conditions, which we have defined. The accuracy of the simulation achieved was ± 5 degrees Celsius as well. Our study suggests that our thermal simulation technology is certainly a powerful tool for the design of EDB.

The 4M5 series of four-cylinder, in-line, direct-injection diesel engines has been released by Mitsubishi Motors Corporation for light and medium-duty trucks and buses. Featuring an updated structure and reflecting the employment of state-of-the-art technology in the design of every component, the new engine series offers high reliability and compact dimensions. Moreover, the new series well meets contemporary demands for high performance, low noise, and clean combustion.