INVESTIGATION OF THE POWER SPLIT MECHANISM IN SERIAL-PARALLEL HYBRID ELECTRIC VEHICLE DEPENDING ON THE ENGINE SPEED VARIATION

Abstract

   Hybrid electric vehicles have two different powertrain systems with different characteristics, electric motor, and engine (ICE). These two powertrain systems can be arranged in serial, parallel or serial-parallel according to different vehicle characteristics. Nowadays, a serial-parallel drive system is widely used which optimally combines the advantages of both serial and parallel powertrain systems. The power split mechanism is used to manage the power transfer strategy of the electric motor and the ICE in the serial-parallel powertrain system. In this study, it is aimed to analyze the powertrain strategy depending on the speed range by adopting an ICE which can obtain constant torque at a certain speed range to the power split mechanism. In the power split mechanism, the ratio of ring/sun gear is kept constant. However, the motor/generator states of the motogenerators and the charge/discharge states of the battery system for different speed and power requirements for the vehicle have been calculated and discussed for different speeds of the ICE. As a result, for the power split mechanism, the effects of ICE speed on fixed torque and the parameters affecting ICE speed are determined.

Keywords

• Hybrid electric vehicle,Series-Parallel,Power split

SERİ-PARALEL HİBRİT ELEKTRİKLİ TAŞITLARDAKİ GÜÇ DAĞITICI (POWER SPLIT) MEKANİZMASININ MOTOR HIZI DEĞİŞİMİNE BAĞLI İNCELENMESİ

Abstract

   Hibrit elektrikli taşıtlarda elektrik motoru ve içten yanmalı motor (İYM) olmak üzere farklı karakteristiklere sahip iki farklı tahrik sistemi bulunmaktadır. Bu iki tahrik sistemi farklı taşıt karakteristiklerine uygun olarak seri, paralel veya seri paralel şekilde düzenlenebilmektedir. Günümüzde yaygın olarak hem seri hem de paralel tahrik sistemlerinin avantajlarını en uygun düzeyde birleştiren seri-paralel tahrik sistemi kullanılmaktadır. Seri paralel tahrik sisteminde elektrik motoru ve İYM’nin güç aktarım stratejisinin düzenlenmesi için güç dağıtıcı (power split) mekanizması kullanılmaktadır. Yapılan bu çalışmada belirli hız aralığında sabit tork elde edilebilen bir İYM’nin güç dağıtıcı mekanizmasına adapte edilmesiyle güç aktarım stratejisinin bu hız aralığına bağlı olarak incelenmesi hedeflenmiştir. Güç dağıtıcı mekanizmasında yörünge/güneş dişli oranı sabit tutulmuştur. Bununla birlikte taşıtın için farklı hız ve güç taleplerinde motojeneratörlerin motor/jeneratör durumları ile batarya sisteminin şarj/deşarj durumları İYM’nin farklı hızları için hesaplanmış ve tartışılmıştır. Sonuç olarak güç dağıtıcı mekanizması için sabit torkta İYM hızının etkileri ve İYM hızını etkileyen parametreler belirlenmiştir.

Keywords

• Hibrit elektrikli taşıt,Seri-paralel,Güç dağıtıcı

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