scholarly journals Research on a China 6b Heavy-duty Diesel Vehicle Real-world Engine out NOx Emission Deterioration and NOx Correction for Humidity and Temperature using On-board Sensors and Big Data Approach

2021 ◽  
Author(s):  
Peng Li ◽  
Lin Lü
Keyword(s):  
Big Data ◽  
Working Condition ◽  
Absolute Humidity ◽  
Nox Emission ◽  
Heavy Duty ◽  
Diesel Vehicles ◽  
Vehicles Emissions ◽  
Useful Life ◽  
Heavy Duty Diesel ◽  
Diesel Vehicle

Abstract China VI standard proposed higher requirements for durability of heavy-duty diesel vehicles emissions. Previous research which took advantages of both on-board sensors and big data approach to get the NOx deterioration factor was rather scarce. This paper used big data approach to study the deterioration of engine out NOx emission based on 254,622 km operation data getting from the on-board sensors or ECUs. Meanwhile, a formula for on-board NOx correction for ambient humidity and temperature had been fitted. The analyses revealed that engine out NOx would not be deteriorated during the useful life or even longer (deterioration factor was 1.014 @700,000km). For a steady working condition, the engine out NOx mass flow (g/h) is negatively linearly correlated with absolute humidity (R2 = 0.997). If Ha was lower than 12g/kg, Ha almost had no effect on engine out NOx concentration (ppm). Otherwise, there was also a negatively linear relationship between them (R2 = 0.978). It is hoped that the methods and conclusions of this paper could provide some enlightenment for future NOx emission deterioration research.

Metals emitted from heavy-duty diesel vehicles equipped with advanced PM and NOX emission controls

2009 ◽  
Vol 43 (18) ◽  
pp. 2950-2959 ◽  
Author(s):  
Shaohua Hu ◽  
Jorn D. Herner ◽  
Martin Shafer ◽  
William Robertson ◽  
James J. Schauer ◽  
...  
Keyword(s):  
Nox Emission ◽  
Heavy Duty ◽  
Diesel Vehicles ◽  
Emission Controls ◽  
Heavy Duty Diesel

scholarly journals The challenge to NO<sub>x</sub> emission control for heavy-duty diesel vehicles in China

2012 ◽  
Vol 12 (7) ◽  
pp. 18565-18604 ◽  
Author(s):  
Y. Wu ◽  
S. J. Zhang ◽  
M. L. Li ◽  
Y. S. Ge ◽  
J. W. Shu ◽  
...  
Keyword(s):  
Emission Factors ◽  
Operating Conditions ◽  
Nox Emission ◽  
Effective Control ◽  
Emission Measurement ◽  
Nox Emissions ◽  
Heavy Duty ◽  
Diesel Vehicles ◽  
Compliance Testing ◽  
Heavy Duty Diesel

Abstract. China's new "Twelfth Five-Year Plan" set a target for total NOx emission reduction of 10% for the period of 2011–2015. Heavy-duty diesel vehicles (HDDVs) have been considered a major contributor to NOx emissions in China. Beijing initiated a comprehensive vehicle test program in 2008. This program included a sub-task for measuring on-road emission profiles of hundreds of HDDVs using portable emission measurement systems (PEMS). The major finding is that neither the on-road distance-specific (g km −1) nor brake-specific (g kW h−1) NOx emission factors for diesel buses and heavy-duty diesel trucks improved in most cases as emission standards became more stringent. For example, the average NOx emission factors for Euro II, Euro III and Euro IV buses are 11.3±3.3 g km−1, 12.5± 1.3 g km−1, and 11.8±2.0 g km−1, respectively. No statistically significant difference in NOx emission factors was observed between Euro II and III buses. Even for Euro IV buses equipped with SCR systems, the NOx emission factors are similar to Euro III buses. The data regarding real-time engine performance of Euro IV buses suggest the engine certification cycles did not reflect their real-world operating conditions. These new on-road test results indicate that previous estimates of total NOx emissions for HDDV fleet may be significantly underestimated. The new estimate in total NOx emissions for the Beijing HDDV fleet in 2009 is 37.0 Gg, an increase of 45% compared to the previous study. Further, we estimate that the total NOx emissions for the national HDDV fleet in 2009 are approximately 4.0 Tg, higher by 1.0 Tg (equivalent to 18% of total NOx emissions for vehicle fleet in 2009) than that estimated in the official report. This would also result in 4% increase in estimation of national anthropogenic NOx emissions. More effective control measures (such as promotion of CNG buses and a new in-use compliance testing program) are urged to secure the goal of total NOxmitigation for the HDDV fleet in the future.

scholarly journals A Study on NO2/NOX Ratio and NOX Emission Characteristics of Heavy-Duty Diesel Vehicles

2019 ◽  
Vol 41 (4) ◽  
pp. 221-227 ◽  
Author(s):  
Taek Ho Chung ◽  
Sun Moon Kim ◽  
Sun Hee Mun ◽  
Hee Kyoung Hong ◽  
Seoung Hwan Lee ◽  
...  
Keyword(s):  
Nox Emission ◽  
Emission Characteristics ◽  
Heavy Duty ◽  
Diesel Vehicles ◽  
Heavy Duty Diesel

scholarly journals The challenge to NO<sub>x</sub> emission control for heavy-duty diesel vehicles in China

2012 ◽  
Vol 12 (19) ◽  
pp. 9365-9379 ◽  
Author(s):  
Y. Wu ◽  
S. J. Zhang ◽  
M. L. Li ◽  
Y. S. Ge ◽  
J. W. Shu ◽  
...  
Keyword(s):  
Emission Factors ◽  
Operating Conditions ◽  
Nox Emission ◽  
Effective Control ◽  
Emission Measurement ◽  
Nox Emissions ◽  
Heavy Duty ◽  
Diesel Vehicles ◽  
Compliance Testing ◽  
Heavy Duty Diesel

Abstract. China's new "Twelfth Five-Year Plan" set a target for total NOx emission reduction of 10% for the period of 2011–2015. Heavy-duty diesel vehicles (HDDVs) have been considered a major contributor to NOx emissions in China. Beijing initiated a comprehensive vehicle test program in 2008. This program included a sub-task for measuring on-road emission profiles of hundreds of HDDVs using portable emission measurement systems (PEMS). The major finding is that neither the on-road distance-specific (g km−1) nor brake-specific (g kWh−1) NOx emission factors for diesel buses and heavy-duty diesel trucks improved in most cases as emission standards became more stringent. For example, the average NOx emission factors for Euro II, Euro III and Euro IV buses are 11.3 ± 3.3 g km−1, 12.5 ± 1.3 g km−1, and 11.8 ± 2.0 g km−1, respectively. No statistically significant difference in NOx emission factors was observed between Euro II and III buses. Even for Euro IV buses equipped with SCR systems, the NOx emission factors are similar to Euro III buses. The data regarding real-time engine performance of Euro IV buses suggest the engine certification cycles did not reflect their real-world operating conditions. These new on-road test results indicate that previous estimates of total NOx emissions for HDDV fleet may be significantly underestimated. The new estimate in total NOx emissions for the Beijing HDDV fleet in 2009 is 37.0 Gg, an increase of 45% compared to the previous study. Further, we estimate that the total NOx emissions for the national HDDV fleet in 2009 are approximately 4.0 Tg, higher by 1.0 Tg (equivalent to 18% of total NOx emissions for vehicle fleet in 2009) than that estimated in the official report. This would also result in 4% increase in estimation of national anthropogenic NOx emissions. More effective control measures (such as promotion of CNG buses and a new in-use compliance testing program) are urged to secure the goal of total NOx mitigation for the HDDV fleet in the future.

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