Emissions and fuel consumption of a hybrid electric vehicle in real-world metropolitan traffic conditions

Wang, An; Xu, Junshi; Zhang, Mingqian; Zhai, Zhiqiang; Song, Guohua; Hatzopoulou, Marianne

doi:10.1016/j.apenergy.2021.118077

Cited by 28 publications

(6 citation statements)

References 25 publications

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“…When compared to other real-world road emissions levels of gasoline and CNG passenger cars in plain cities, as studied using PEMS, the gaseous pollutant emission factors of CNG taxis in Chongqing before and after TWC replacement were higher than the reported results of previous studies [4,28,[32][33][34][35][36]. CNG taxis driving in mountainous cities may have higher emissions because their engines might work harder and consume more fuel to maintain the same average speed as vehicles in other cities [37].…”

Section: Distance-specific Emission Factorsmentioning

confidence: 68%

Evaluating Real Driving Emissions of Compressed Natural Gas Taxis in Chongqing, China—A Typical Mountain Cities

Hu,

Duan,

Tang

et al. 2024

Atmosphere

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Compressed natural gas (CNG) taxis represent the most ubiquitous and dynamically active passenger vehicles in urban settings. The pollutant emission characteristics of in-use CNG taxis driving on a typical mountain city before and after three-way catalyst (TWC) replacement was examined using a modular on-board portable emissions measurement system (PEMS), the OBS-ONE developed by Horiba. The results showed that the exhaust NO of CNG taxis equipped with deactivation TWC exceeded the emission limits, even higher than gasoline vehicles. The high emission rate of CNG taxis is mainly concentrated on road slopes between a 2% and 6% gradient and a deceleration rate in the interval of [0.5, 4], respectively, which results in higher emissions from CNG taxis traveling in the mountain city of Chongqing than other cities and vehicles. Moreover, the pollutant emission rates of the in-use CNG taxis were highly correlated with the velocity and the vehicle specific power (VSP). After a new TWC replacement, the emission factors of carbon monoxide (CO), total hydrocarbons (THC), nitrogen oxides (NOx), and particle number (PN) decreased by 85.21–89.11%, 68.71–85.49%, 60.91–81.11%, and 62.26–68.39%, respectively. Our results will provide guidance for urban environments to carry out the comprehensive management of in-use vehicles and emphasize the importance of TWC replacement for CNG taxis.

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Section: Distance-specific Emission Factorsmentioning

confidence: 68%

Evaluating Real Driving Emissions of Compressed Natural Gas Taxis in Chongqing, China—A Typical Mountain Cities

Hu,

Duan,

Tang

et al. 2024

Atmosphere

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“…In HEVs, the range and power of conventional vehicles are paired with high fuel efficiency and low exhaust emissions. [21].…”

Section: Artificial Intelligence In Bev Hev and Phevmentioning

confidence: 99%

A Review of Artificial Intelligence-Enabled Electric Vehicles in Traffic Congestion Management

Mahardhika¹,

Putriani²

2023

Proceedings of the 1st International Conference on Sustainable Engineering Development and Technological Innovation, ICSEDTI 20

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Artificial Intelligence (AI) has been widely used in many sectors, including in the field of transportation. AI is used not only in manufacturing automated smart vehicles but also to optimize power in electric vehicles. In the same way, various types of electric vehicles, such as Battery Electric Vehicles (BEV), Hybrid Electric Vehicles (HEV), etc., are increasingly being developed for environmentally friendly vehicles. In this review, AI can help optimize the power of electric vehicles when traffic congestion happens. Based on the literature review, Traffic Congestion Management with AI technology on electric vehicles can detect several conditions. These conditions can be occurred in traffic congestion such as stress on drivers. While waiting for traffic jams, the drivers requires alternative road solutions and offers entertainment options. AI will predict how long the traffic congestion will last.

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“…However, the electrification of passenger vehicles may face several challenges in the future, − creating uncertain obstacles to electrification. Earlier studies have reported the role of EVs promotion or emission standard upgrade in the synergistic reduction of APs and CO 2 emission from passenger vehicles. ,− However, the impact of climate-oriented efforts on the APs emission reduction potential from the emission standard has not been fully evaluated, which is the critical point of controversy over the need to upgrade the LDVs standard. In addition, the schedule and policy strength of future electrification implementation are uncertain, which creates a bottleneck issue for assessing the APs reduction potential of EVs and exploring the need to implement CHINA 7.…”

Section: Introductionmentioning

confidence: 99%

Upgrading Passenger Vehicle Emission Standard Helps to Reduce China’s Air Pollution Risk from Uncertainty in Electrification

Xie,

Chen,

Dai

et al. 2024

Environ. Sci. Technol.

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Upgrading to the CHINA 7 standard is crucial for managing air pollution from passenger vehicles in China. Meanwhile, China aims to achieve carbon neutrality by 2060, which necessitates large-scale replacement of gasoline vehicles with electric vehicles in the future. Consequently, the public might view upgrading gasoline vehicles to the CHINA 7 standard as redundant. However, the emission reduction benefits of upgrading standards in the context of uncertain electrification ambitions have not received adequate attention. Here, we show that upgrading standards will compensate for the absence of emissions reductions due to hindered electrification efforts. In the best scenario, China's CO 2 emissions can be reduced to 0.047 Gt and NO x to 8.2 × 10 3 t in 2050. In nonextreme electrification scenarios with CHINA 7 standard, the emission intensity reduction will remain the main driver for emission reductions, outweighing the electrification contribution. In extreme electrification scenarios, upgrading standards will tackle the increased emissions from plug-in hybrid electric vehicles. Our fleet-level results advocate for early standards upgrades to enhance resilience against air pollution risks arising from uncertainties in electrification. Our evidence from China, with one of the most stringent emission standards, can provide a reference point for the world on the upgrading passenger vehicle emission standard issue.

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Emissions and fuel consumption of a hybrid electric vehicle in real-world metropolitan traffic conditions

Cited by 28 publications

References 25 publications

Evaluating Real Driving Emissions of Compressed Natural Gas Taxis in Chongqing, China—A Typical Mountain Cities

Evaluating Real Driving Emissions of Compressed Natural Gas Taxis in Chongqing, China—A Typical Mountain Cities

A Review of Artificial Intelligence-Enabled Electric Vehicles in Traffic Congestion Management

Upgrading Passenger Vehicle Emission Standard Helps to Reduce China’s Air Pollution Risk from Uncertainty in Electrification

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