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Characteristics of Transient NOx Emissions of HEV under Real Road Driving
Technical Paper
2020-01-0380
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To meet the request of China National 6b emission regulations which will be officially implemented in China, firstly including the RDE emission test limits, the transient emissions on real road condition are paid more attention. A non-plug-in hybrid light-duty gasoline vehicles (HEV) sold in the Chinese market was selected to study real road emissions employed fast response NOx analyzer from Cambustion Ltd. with a sampling frequency of 100Hz, which can measure the missing NO peaks by standard RDE gas analyzer now. Emissions from PEMS were also recorded and compared with the results from fast response NOx analyzer. The concentration of NOx emissions before and after the Three Way Catalyst (TWC) of the hybrid vehicle were also sampled and analyzed, and the working efficiency of the TWC in real road driving process was investigated. It is found that when the engine is at high-speed and heavy-load conditions, especially when fuel is injected after fuel cut, instantaneous spikes in tailpipe NO emissions could be observed, which means that traffic positions such as crosswalks, speed bumps, expressway entrances, traffic lights, would lead to higher NOx emissions, because the instantaneous fuel cut-off occurs during the acceleration shifting process, the TWC is in an oxygen-rich state. Obvious transient effects were revealed and the results could be used for further reducing NOx emissions from automotive RDE and engine calibration of RDE.
Authors
- Yonghao Zhang - Tongji University
- Jun Deng - Tongji University
- Qiang Li - Cambustion, Ltd.
- Yintong Liu - Chongqing Changan Automobile Co., Ltd.
- Bo He - Anhui Jianghuai Automobile Group Corp.
- Zongjie Hu - Tongji University
- Shi Bo - Anhui Jianghuai Automobile Group Corp.
- Liguang Li - Tongji University
Topic
Citation
Zhang, Y., Deng, J., Li, Q., Liu, Y. et al., "Characteristics of Transient NOx Emissions of HEV under Real Road Driving," SAE Technical Paper 2020-01-0380, 2020, https://doi.org/10.4271/2020-01-0380.Data Sets - Support Documents
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References
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