Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1757-1764    Article in Press

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  MODIFICATION OF EQUIVALENT CONSUMPTION MINIMIZATION STRATEGY FOR A HYBRID ELECTRIC VEHICLE
 
M. Delkhosh and M. Saadat Foumani
 
( Received: July 30, 2016 – Accepted in Revised Form: November 11, 2016 )
 
 

Abstract    Equivalent consumption minimization strategy (ECMS) is one of the main real-time control strategies for hybrid electric vehicles (HEVs). This paper proposes a method to modify this strategy. This modification reduces calculation time of ECMS and therefore, facilitates its application as the real-time controller. Dynamic programming (DP) method is employed to reach this aim. This method is applied on the considered HEV in different drive cycles and its results are used to reduce the calculation time of the ECMS. It is notable that the objective of DP in the urban cycles is to simultaneously minimize the fuel consumption (FC) and NOx emission, while the objective in the highway cycles is only the vehicle FC. In order to examine the success of the proposed modifications, the modified ECMS is compared with the basic ECMS in different drive cycles. It is demonstrated that the execution time of the modified ECMS is much less than that of basic ECMS, while the vehicle’s FC and NOx levels slightly increase through application of the modified ECMS.

 

Keywords    Hybrid Electric Vehicle, Equivalent Consumption Minimization Strategy, Real-time, Fuel Consumption, NOx Emission

 

چکیده    استراتژی کنترلی ECMS یکی از مهمترین استراتژی­های کنترلی برخط برای خودورهای هیبرید الکتریکی است. در این مقاله روشی برای بهبود این استراتژی کنترلی پیشنهاد می­شود. در این بهبود مدت زمان محاسبات ECMS کاهش یافته و در نتیجه، استفاده از این استراتژی به عنوان استراتژی برخط تسهیل می­شود. برای رسیدن به این هدف، روش برنامه­نویسی پویا استفاده می­­شود. این روش روی خودروی موردنظر در سیکل­های رانندگی مختلف استفاده شده و نتایج آن برای کاهش زمان محاسبات استراتژی ECMS استفاده می­شود. شایان ذکر است که تابع هدف برای روش برنامه­نویسی پویا در سیکل شهری عبارت است از: کاهش همزمان مصرف سوخت و آلایندگی NOx، و برای سیکل خارج شهر عبارت است از: کاهش مصرف سوخت. برای بررسی میزان اثربخش بودن اصلاحات پیشنهادی، استراتژی بهبود یافته­ی ECMS با نوع پایه­ی آن در سیکل­های رانندگی مختلف مقایسه می­شود. نتایج نشان می­دهد که زمان اجرای استراتژی بهبود یافته بسیار کمتر از نوع پایه است، در حالی که در صورت استفاده از استراتژی بهبود یافته، شاهد کمی افزایش در میزان مصرف سوخت و آلایندگی خواهیم بود.

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