Kommuri, Naga Kavitha, Allen, A. J., McGordon, Andrew and Dinh, Quang Truong (2019) Effect of system parameters on load levelling strategy for a plugin parallel hybrid two-wheeler. In: IEEE-2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER), Monaco, 8-10 May 2019 (Submitted)

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Abstract

An appropriate energy management strategy is able to further improve the fuel economy of hybrid electric vehicles. Rule-based energy management algorithms are dominant in the hybrid automotive industry because of their ease in implementation and fast computation capability. However, their optimality differs a lot depending on the set of parameters considered, the rules developed and their calibration. This paper develops a modified rulebased energy-management strategy (MEMS) using the load levelling strategy concept for a class of plugin parallel HEVs. Here, the MEMS is capable of locating the optimal working points of the engine in order to increase fuel efficiency. In addition to the fuel efficiency, factors like - Engine sizing, clutch engage speed, Battery charging C rates, SOC limits and regen braking energy, effecting the MEMS performance are critically analysed. To validate the effectiveness of the MEMS and as well as its affecting factors, a numerical simulations on an HEV plant model are carried out and discussed in detail. Firstly, the powertrain architecture of the vehicle is briefly introduced. Secondly, a simple mathematical model for this system is designed for the development of an energy-mangement strategy. Thirdly, a rule-based control framework is constructed considering the key system objectives, inputs and constraints some of which are specific to small engine vehicles. Next, the proposed MEMS is developed using the load levelling approach. Finally, numerical simulations with a drive cycle, standardized particularly for small engine vehicles are performed to evaluate the fuel efficiency and to assess the effect of various system parameters on the MEMS capability.

Keywords: hybrid vehicles, rule-based, energy management system, load levelling. Introduction: Concerns over climate change, constraints on energy resources, stringent regulations on emissions and energy efficiencies are pushing the transportation industry to focus more on alternative technology platforms. In the developing and low-income countries, the dominant transport is small urban vehicles. The share of HC, CO and PM from small urban vehicles are high compared to the other forms of transportation. Hybridization of small urban vehicles has been the prime objective in recent years in these regions. One of the key important aspects of hybrid vehicle design is to optimize the performance of the hybrid energy system by developing an intelligent energy management strategy. However, very limited work is been done in the area of small urban hybrid vehicles and their energy management systems. In this paper, the investigation is focussed on the load levelling capability under various influences of system parameters for a plugin, parallel small hybrid vehicle. To validate the effectiveness of load levelling, parameters influencing the load levelling like different battery charge C rating, engine sizing, clutch engage speed and regeneration energy limits are considered. Capability of MEMS under various influences is studied and the conclusions are drawn respectively. Small engine vehicles have unique system constraints when compared to other alternate personal transportation and the same is considered while gaging the MEMS performance.

Item Type:	Conference Item (Speech)
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TS Manufactures
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Official Date:	10 May 2019
Dates:	Date Event 10 May 2019 Accepted
Status:	Peer Reviewed
Publication Status:	Submitted
Access rights to Published version:	Restricted or Subscription Access
Conference Paper Type:	Speech
Title of Event:	IEEE-2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER)
Type of Event:	Conference
Location of Event:	Monaco
Date(s) of Event:	8-10 May 2019
Related URLs:	Publisher

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