Smart accelerating and braking achieving higher energy efficiencies in electric vehicles

Efficient operation of EVs is critical to optimise the usage of their relative small energy storage. Although each motor controller has a unique range of motor rotational speeds (rpm) and loads for optimal efficiency, EVs lack variable gearboxes that can match vehicle speed and motor rpm to efficien...

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Bibliographic Details
Published in:International journal of electric and hybrid vehicles 2018, Vol.10 (4), p.283-298
Main Authors: Wäger, Guido, Whale, Jonathan, Bräunl, Thomas
Format: Article
Language:English
Subjects:
Braking
Controllers
Deceleration
Efficiency
Electric vehicles
Energy consumption
Energy storage
Gearboxes
High acceleration
Motors
Optimization
Traffic speed
Velocity
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Summary:Efficient operation of EVs is critical to optimise the usage of their relative small energy storage. Although each motor controller has a unique range of motor rotational speeds (rpm) and loads for optimal efficiency, EVs lack variable gearboxes that can match vehicle speed and motor rpm to efficient controller regions. EVs thus rely on the driver to actively influence the load by changing acceleration or deceleration rates for a more efficient operation. Despite this, most EV efficiency studies use speed profiles with small changes in acceleration and deceleration rates. This study investigates the impact of various high load variations in accelerations and decelerations on energy consumption. The results show significant improvements in efficiency and reduced energy consumption by applying high loads at low vehicle speeds and strong deceleration rates. However, the increased losses under certain high acceleration rates outweighed the benefits of loading an EV.
ISSN:1751-4088
1751-4096
DOI:10.1504/IJEHV.2018.098089