Abstract
This paper presents a real-time energy management strategy to distribute the power demand between two independent motors properly. Based on the characteristics of the novel transmission system, an enumeration-based searching approach is used to hunt for the optimal working points for both motors to maximize the overall efficiency. Like many energy management strategies, approaches that focus on reducing energy consumption can result in frequent gearshifts. To improve drivability and make a balance between energy consumption and gearshifts, a cost function is designed. To verify the effectiveness of the proposed method, a mathematical model is built, and the simulation results demonstrate the achieved improvements.
Highlights
As the energy resource shortage is becoming increasingly serious, the vehicle industry is facing an unprecedented challenge [1,2,3]
Extensive research has shown that the motor size can be reduced by applying multispeed transmissions to electric vehicle platforms, as well as achieving the desired power by providing a wider speed range of usable torque and reducing energy consumption by gear-shifting [10]
This paper proposes a real-time energy management strategy to improve the overall efficiency of a dual-motor transmission system
Summary
As the energy resource shortage is becoming increasingly serious, the vehicle industry is facing an unprecedented challenge [1,2,3]. In all current kinds of multispeed transmission, AMT stands out as a proper choice of electric vehicle transmission due to the advantages of the technique’s maturity, reliable running performance, and good efficiency [11] It has a low manufacturing cost and compact size [12]. The equivalent consumption minimization strategy (ECMS) transfers the electric energy consumption to fuel consumption by using an equivalent factor [28] It cannot be used in the dual-motor input structure since the battery supporting both motors is working as the only power source without power transfer problems. Excessive gear shifting [29] is one of the most typical problems encountered by energy management strategies, as achieving the best efficiency inherently requires frequent gear changes To solve this problem, a specific shifting stability control approach is proposed.
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