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This paper shows one example of cooling system, optimized by utilizing computer simulation in the early development stage. First, a numerical simulation is conducted to obtain the air flow rate through engine compartment room by the software “STREAM”. Second, ΔTw are calculated by the software “KULI”, developed by Steyr-Daimler-Puch AG, to evaluate the original cooling system. Third, the optimization of this system is conducted by the design of experiment for cost saving and weight reduction. The test value was well matched with the calculated one and CAE was confirmed to be very helpful for saving the proto-build cost and time period.

For the simulation of driving road- and offroad-vehicles a mathematical model as well as a program have been developed, which allows the prediction of the driving performances, driving time and speed, fuel consumption, exhaust emissions, loading of the drive line and strain on the driver when the vehicle runs on prescribed routes. The driving simulation takes into account engine, tire, gearbox, and general vehicle data, height and outline profiles of the route, visibility, permissible transverse acceleration and wheel or exhaust braking. The aim of the simulation calculations is to find the optimum overall economy for given operating conditions by coordinating the individual elements of the total system of engine-transmission-vehicle. Not only can vehicles be optimized, but existing vehicles can also be easily compared and assessed.