Abstract    In this paper, the effect of the Intake Valve Deactivation (IVDA) on engine performance is investigated in detail. Based on an optimization platform with Genetic Algorithm (GA) and engine thermodynamic model, the characteristics of the engine volumetric efficiency and pumping loss were studied under the cam-drive, Single Intake Valve (SIV) and Dual Intake Valves (DIV) operating modes, and the effect of the IVDA on the engine fuel economy was revealed with taking the power consumption of the Electromagnetic Actuated Valvetrain (EAVT) system into consideration. Then, switch rules for the SIV and DIV mode was proposed, and the switching boundary conditions between them were confirmed. Finally, the optimal intake valve close timings for the EAVT system were obtained. Results show that, under the low speed conditions, the SIV mode has little influence on the engine volumetric efficiency, while within the high speed conditions the effect of the IVDA on the volumetric efficiency is significant; compared with the traditional cam-drive valvetrain, the pumping loss of the EAVT engine decreases significantly and shows unique characteristics due to the use of the EIVC strategy; with the use of the IVDA scheme, the energy consumption of the EAVT system reduces, but the engine pumping loss increases in the meantime, both balance their influence on the engine fuel economy. In general, the IVDA scheme is preferred if the engine volumetric efficiency can be ensured, otherwise, the DIV mode takes priority over the SIV mode to maintain the engine power performance.

Keywords    Camless valvetrain, Electromagnetic actuated valvetrain, Intake valve deactivation, Early intake valve closing

چکیده    در این مقاله، اثر غیرفعال کردن شیر ورودی (IVDA) بر عملکرد موتور با جزئیات مورد بررسی قرار گرفته است. بر اساس پلت فرم بهینه سازی با الگوریتم ژنتیک (GA) و مدل ترمودینامیکی موتور، ویژگی های بازده حجمی موتور و اتلاف پمپ تحت حالت های رانش میله، سوپاپ مکش تنها (SIV) و مصرف دو سوپاپ (DIV) مورد بررسی قرار گرفت، و اثر IVDA بر اقتصاد سوخت موتور با در نظر گرفتن مصرف برق سیستم های الکترومغناطیسی محرک مجموعه سوپاپ (EAVT) بررسی شد. سپس، قوانین سوئیچ برای حالت SIV و DIV مطرح شد و تعویض شرایط مرزی بین آنها تایید شد. در نهایت، زمان بهینه بستن شیر ورودی برای سیستم EAVT به دست آمد. نتایج نشان می دهد که تحت شرایط سرعت کم ، حالت SIV تاثیر کمی بر روی راندمان حجمی موتور دارد، در حالی که در شرایط سرعت بالا اثر IVDA در راندمان حجمی قابل توجه است. در مقایسه با مجموعه سوپاپ رانش میله سنتی، اتلاف پمپ موتور EAVT به طور قابل توجهی کاهش می یابد و ویژگی های منحصر به فردی را با توجه به استفاده از استراتژیEIVC نشان می دهد؛ با استفاده از این طرحIVDA ، مصرف انرژی سیستم EAVT کاهش می یابد، اما اتلاف موتور پمپاژ افزایش می یابد و هر دو اثر خود را روی اقتصاد سوخت موتور متعادل می کنند. به طور کلی، طرح IVDA در صورتی که راندمان حجمی موتور تضمین شود ترجیح داده می شود، در غیر این صورت، حالت DIV اولویت بیشتری نسبت به حالت SIVبرای حفظ عملکرد قدرت موتوردارد.

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