To secure profitability with no loss of marketability or mitigate complexity of system as electrification of vehicle is getting much advanced, new perspective of optimization should be considered. Conventional optimization method like trial-error process cannot be effective for electrification development era anymore. In this paper, we present a systematic methodology to optimize conventional E/E (Electric / Electronic) architecture using system engineering process. With this process applied to the A/C compressor control architecture, we derived a new optimized architecture that is simple and function based with low cost and low weight. In this paper, the methodology based on the system engineering process (V model) is introduced from the initial analysis of each sub-system’s functional and non-functional requirement to the final vehicle level validation with new optimized E/E architecture derived by this process. this new standardized approach can be applied to any other E/E architecture yet to be optimized. To prove the effect of suggested methodology, A/C compressor’s E/E architecture is applied as the example of E/E architecture optimization. Conventional E/E architecture are configured by parallel and cumulative requirements from each sub-system. Thus, conventional E/E architectures are generally complicated and not optimized and even causing increase of cost and weight and also EMC performance deterioration. To resolve this complexity and redundancy of conventional E/E architecture, optimization process based on system engineering is proposed. The result of this study is shown as next. Each sub-system for A/C compressor E/E architecture was defined newly in perspective of functional and non-functional. And requirements of each sub-system for E/E architecture were derived newly through functional analysis. Based on functional definition and requirement, new optimized architecture was suggested and verified with each sub-system’s constraints. To secure equivalent reliability of conventional E/E architecture and eradicate concerned side-effects of new architecture, optimization level was compromised and additional fail-safe logic was devised and applied. The limitation of this study is that the effect of this new optimization process was proven with only one example. But, several examples have been being implemented with this methodology not indicated on this paper. And due to compromise between optimization and reliability, optimization level is limited. And further fail-safe logic was applied for eradication of side-effect. This results of study can be referred to as new optimization method for various system not only E/E architecture but also interface between systems. This paper includes all optimization tasks based on system engineering process from initial analysis stage to final validation stage. This paper can be usefully utilized for new consideration of optimization. The conclusion of this study is shown as next. First, to confirm that the system engineering process for E/E optimization is effective and efficient. Second, new E/E architecture for A/C compressor was suggested and applied to real vehicle in mass production. Third, new E/E architecture of A/C compressor was verified and validated systematically according to the system engineering with bottom up and flexible way. Finally, this introduced new methodology for optimization can be utilized for other systems E/E architecture further.
Mr. JIWAN SON, Research Engineer, HYUNDAI MOTORS