In this paper it is presented a mechanical study made on prototype parts created from aluminium and thermal conductive plastic. The scope is to replace full metal parts used for cooling electronic control unit in automotive industry and save costs. We used aluminium plates and thermal conductive plastic parts for this study. The permanent bonding of two materials, without any glue or additional additives, can be obtained by applying heat on an aluminium plate until around 300 degrees Celsius and pressing the plate on a thermal conductive plastic part. This solution has the following advantages: it can be used to cool local spots and bring around 30% savings by replacing full aluminium housings with parts built from plastic and local aluminium plates. Where the heat dissipation cannot be made without forced air convection, a solution is to combine plastic housing with an aluminium heat sink. The assembly solution is innovative. Our tests prove the efficiency of this solution to be around 20% lower than a full aluminium housing, from cooling effect point of view.
The theoretical model estimates the characteristic parameters of a car spark ignition engine by using complex functions. Analyzing the variation of the efficiencies and the fuel consumption at various operating regimes it is possible to optimize them according to the operating regime of the car. It is also studied a method for estimation of the specific fuel consumption of the spark ignition engine by considering engine operation in variable mode. The theoretical study presented by authors contributes actively to the optimization of the interaction between vehicle and propulsion system by identifying low fuel consumption modes.
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