Hybrids Are a Perfect Fit for Traffic Jams of India and China

If you can't beat stop-and-go traffic in India and China, you might as well join it, but only if you're driving a hybrid car. The resulting fuel savings of about 50 percent are greater than what drivers experience in the United States and could make a big difference in countries experiencing a rapid growth in the number of cars on the road, according to recent U.S. Department of Energy research.

Hybrid cars offer 47 to 48 percent in fuel savings over conventional cars in India, according to two new papers by the U.S. Department of Energy’s Lawrence Berkeley National Laboratory. The simulations also showed that Chinese drivers could reap 53 to 55 percent in fuel savings by taking the wheel of a hybrid. The fuel savings come from three factors—regenerative braking, turning off the engine in a stopped or low-power condition, and the hybrid electric motor and batteries allowing the engine to operate at higher efficiency.

"We weighed the importance of these three mechanisms against each other for the Indian vehicles, and found that the ability to increase engine efficiency was the most important reason, second was regenerative braking, then engine shutdown," Samveg Saxena, a researcher in the Grid Integration Group at Lawrence Berkeley National Laboratory and a coauthor on the new studies, said in a press release.

The simulated results for India and China compare favorably to hybrid car fuel savings of about 40 percent when driving in typical U.S. traffic conditions.

U.S. fuel efficiency ratings use drive cycles that include about 55 percent city driving and 45 percent highway driving, but those cycles are different in India and China. To accurately reflect the situations there, researchers had to simulate the drive cycles for New Delhi and Pune in India and compare the results to the Modified Indian Drive Cycle, the test used for India's official fuel economy rating. For China, the researchers simulated drive cycles in 11 cities and tested three possible hybrid powertrains.

"With the official fuel economy test procedure currently used in India, fuel savings for hybrids are fairly grossly underestimated, showing only a 29 percent savings over conventional vehicles," said Anand Gopal, a senior scientific engineering associate in the International Energy Studies Group at at Lawrence Berkeley National Laboratory, and lead author on the studies. "The test cycle is not representative of driving conditions in India, so that's sending the wrong signal to the consumer."

(The Modified Indian Drive Cycle is based on the European Drive Cycle with the maximum speed reduced to 90 kilometers per hour. The European Drive Cycle includes four repeated urban driving cycles and a highway driving cycle. But researchers have shown hat the Modified Indian Drive Cycle does not match up well with real-world driving patterns. For instance, the average speed for driving tests carried out in Pune were 16 percent lower than the average speed in the official drive cycle. The average acceleration and deceleration in the Pune drive cycle were 120 percent higher and 133 percent higher, respectively.)

Gopal and his colleagues used their powertrain simulation model, named Autonomie, to create hypothetical hybrid versions of top-selling conventional cars—the Maruti Alto in India and the Buick Excelle in China. The results for India are detailed in the January issue of the journal Applied Energy, and those for China have been accepted for publication in the International Journal of Powertrains.

Such results may not surprise anyone, but both India and China may have to take additional action if they want to encourage drivers to buy hybrid cars—vehicles currently viewed as higher-end products. Hybrids also won't solve the road congestion problems and epic traffic jams that currently plague drivers in both countries. For that governments will have to expand road infrastructure, improve public transit options or take steps to alter driver behavior. But for now, many Chinese commuters have voted with their wallets by snapping up millions of electric bikes as a cheaper, more agile form of

0

想看更多 不感兴趣
重复、旧闻
内容质量差
确定
北汽新能源总经理郑刚:成绩代表过去,我们只谈未来
盼达用车CEO高钰:蓄力“分时租赁+无人驾驶”,打造智能交通领先出行平台
2017第四届轩辕奖揭晓:荣威RX5斩获年度大奖 北汽EU260获新能源奖
捷豹有望推出纯电动车型 或命名EV-TYPE
保时捷将推卡宴轿跑版曝光 或搭插电混合动力
江苏“十三五”新能源汽车推广方案发布,到2020年推广超25万辆
汽车动力电池产能门槛适度调低 性能研发要求将提高
时速最高达16英里,自动驾驶公交车首次现身美国
2018格力电器换届董明珠存变数 珠海银隆或是其退路
谷歌无人车专利曝光:可挑选最佳上下客地点
科技与奢华并存,宾利将推OLED触控技术
布局燃料电池动力系统,猛狮科技拟竞购上燃动力51%股权
奥特佳拟25亿元收购海四达电源 进军锂电池业务
四大车企在欧洲部署快速充电站 欲赶超特斯拉
百辆特斯拉Model X挑战吉尼斯世界纪录
宝马证实将推M系电动版 仍以性能为重
江淮2017年将推3款电动车 销量预增63%
外媒:2017年无人驾驶汽车将迎来7大里程碑
互联网造车如何实现盈利?
艾瑞泽5e实车曝光,续航300公里,今年第二季度上市
下一篇

[2014中国年度绿色汽车]专家评委 吴志新

绿色汽车,评选,吴志新



第三方登录
纯净阅读
意见反馈

反馈和建议 在线回复

第一电动网
Hello world!