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CLC number: U495; TP311.13

On-line Access: 2023-12-04

Received: 2023-01-03

Revision Accepted: 2023-12-05

Crosschecked: 2023-04-06

Cited: 0

Clicked: 1062

Citations:  Bibtex RefMan EndNote GB/T7714


Zhenyi XU




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Frontiers of Information Technology & Electronic Engineering  2023 Vol.24 No.11 P.1633-1646


High-emitter identification for heavy-duty vehicles by temporal optimization LSTMand an adaptive dynamic threshold

Author(s):  Zhenyi XU, Renjun WANG, Yang CAO, Yu KANG

Affiliation(s):  Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei 230088, China; more

Corresponding email(s):   xuzhenyi@mail.ustc.edu.cn, kangduyu@ustc.edu.cn

Key Words:  High-emitter identification, Temporal optimization, On-board diagnostic device (OBD), Dynamic threshold

Zhenyi XU, Renjun WANG, Yang CAO, Yu KANG. High-emitter identification for heavy-duty vehicles by temporal optimization LSTMand an adaptive dynamic threshold[J]. Frontiers of Information Technology & Electronic Engineering, 2023, 24(11): 1633-1646.

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%A Zhenyi XU
%A Renjun WANG
%A Yang CAO
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T1 - High-emitter identification for heavy-duty vehicles by temporal optimization LSTMand an adaptive dynamic threshold
A1 - Zhenyi XU
A1 - Renjun WANG
A1 - Yang CAO
A1 - Yu KANG
J0 - Frontiers of Information Technology & Electronic Engineering
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EP - 1646
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/FITEE.2300005

Heavy-duty diesel vehicles are important sources of urban nitrogen oxides (NOx) in actual applications for environmental compliance, emitting more than 80% of NOx and more than 90% of particulate matter (PM) in total vehicle emissions. The detection and control of heavy-duty diesel emissions are critical for protecting public health. Currently, vehicles on the road must be regularly tested, every six months or once a year, to filter out high-emission mobile sources at vehicle inspection stations. However, it is difficult to effectively screen high-emission vehicles in time with a long interval between annual inspections, and the fixed threshold cannot adapt to the dynamic changes of vehicle driving conditions. An on-board diagnostic device (OBD) is installed inside the vehicle and can record the vehicle’s emission data in real time. In this paper, we propose a temporal optimization long short-term memory (LSTM) and adaptive dynamic threshold approach to identify heavy-duty high-emitters by using OBD data, which can continuously track and record the emission status in real time. First, a temporal optimization LSTM emission prediction model is established to solve the attention bias discrepancy problem on time steps that is caused by the large number of OBD data streams in practice. Then, the concentration prediction error sequence is detected and distinguished from the anomalous emission contexts using flexible criteria, calculated by an adaptive dynamic threshold with changing driving conditions. Finally, a similarity metric strategy for the time series is introduced to correct some pseudo anomalous results. Experiments on three real OBD time-series emission datasets demonstrate that our method can achieve high accuracy anomalous emission identification.




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