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A Study of Fuel Economy Improvement of Small Delivery Hybrid Trucks
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 13, 2014 by SAE International in United States
Annotation ability available
Next-generation vehicles which include Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV) are researched and expected to reduce carbon dioxide (CO2) emissions in the future. In the national new-car sales in 2012 of Japan, the total sales of hybrid vehicles kept 26.5% share. In the field of passenger cars, this share was 29.7%. And, this share rose about four times compared to that of 2008 .
Also, small delivery hybrid trucks are increased in the commercial vehicle class. Fuel economy of hybrid trucks in the catalog specifications is relatively better than that of the diesel tracks which have no hybrid systems. Nevertheless, hybrid trucks' users report that advantages of fuel economy of hybrid trucks at the real traffic driving conditions are small.
In this report, in order to research that the actual traveling fuel economy of hybrid truck' users has no advantage compared with the diesel truck' users, the traveling fuel economy of hybrid trucks and diesel trucks was surveyed by using the chassis dynamometer system. Then, the measure to improve the fuel economy of hybrid truck was identified by using the hybrid power-train bench test system.
(1) Chassis dynamo meter test
Test vehicles of hybrid truck and diesel truck are suited the new long-term emission regulation. Test vehicles were set 4, 135kg. Fuel economy of each vehicle was investigated by using chassis dynamometer system. Improvement of fuel economy of hybrid truck was compared to diesel truck at JE05 mode, Urban, Rural and Highway. The test result, improvement of fuel economy of this hybrid trucks in the urban was low. And, when average vehicle speed was high, improvement of fuel economy of hybrid truck was increase. This result was equal to the data of hybrid trucks' users. For one thing, driving speed of hybrid trucks' users was low. In other words, this driving pattern was similar to urban mode. So, hybrid trucks could not get regeneration power in this urban mode. Thus, these trucks could not assist engine power by electrical-motor.
(2) Hybrid power-train bench test
Control methods of improved fuel economy of hybrid trucks were investigated by using HEV power-train bench test system, which is possible to reproduce virtual HEV in the test room without producing a prototype of HEV. Control methods of improved fuel economy at JE05 urban mode were investigated. As the result, Improvement of fuel economy of this truck, which was operated at the optimal engine operation line, was 29.4% compared to diesel truck. This engine was operated at high efficiency conditions, which is in lower engine speed and higher engine torque. At the same time, electrical-motor of this truck was operated the production power or the regeneration power.
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CitationOkui, N. and Niikuni, T., "A Study of Fuel Economy Improvement of Small Delivery Hybrid Trucks," SAE Technical Paper 2014-01-2903, 2014, https://doi.org/10.4271/2014-01-2903.
- JAPAN AUTOMOBILE DEALERS ASSOCIATION http://www.jada.or.jp/
- Suzuki T. Thorough study of diesel engine TOKYO Grand Prix BOOK PUBLISHING 2012 258
- Ministry of Land, Infrastructure, Transport and Tourism Handout of Panel on Infrastructure Development Environment Subcommittee, Transportation Policy Council transportation system Subcommittee Environment Subcommittee 2011
- Japan Trucking Association Report of Technology research of hybrid truck 2011
- Okui , N. , Kawai , T. , Niikuni , T. , Suzuki , M. et al. Development of Evaluation System for Exhaust Gas and Fuel Economy of Next-generation Hybrid Electric Vehicles SAE Technical Paper 2013-01-2602 2013 10.4271/2013-01-2602
- Ministry of Land, Infrastructure, Transport and Tourism Handout of Advisory Committee on Energy and Natural Resources Energy Conservation Standards Subcommittee heavy vehicles criteria subcommittee, Heavy-duty vehicle fuel economy standards study group 2005
- Society of Automotive Engineers of Japan Vehicle Specification Table 2012
- Dingel , O. , Ross , J. , PhD Trivic , I. , Cavina , N. et al. Model-Based Assessment of Hybrid Powertrain Solutions SAE Technical Paper 2011-24-0070 2011 10.4271/2011-24-0070