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Real-Driving Measurement of Vehicle Interior Air Quality and Cabin Air Filtering Performance by Using Low-Cost Sensors

Journal Article
02-15-04-0020
ISSN: 1946-391X, e-ISSN: 1946-3928
Published April 07, 2022 by SAE International in United States
Real-Driving Measurement of Vehicle Interior Air Quality and Cabin
                    Air Filtering Performance by Using Low-Cost Sensors
Citation: Cha, Y., Yin, C., Du, J., Xia, T. et al., "Real-Driving Measurement of Vehicle Interior Air Quality and Cabin Air Filtering Performance by Using Low-Cost Sensors," SAE Int. J. Commer. Veh. 15(4):2022, https://doi.org/10.4271/02-15-04-0020.
Language: English

Abstract:

Vehicle interior air quality is usually determined by the levels of in-cabin air pollutants, such as particulate matter (PM), gaseous air pollution (volatile organic compounds [VOCs], oxides of nitrogen [NOx], and carbon monoxide [CO]), and carbon dioxide [CO2], which reflect the freshness of indoor air. Nowadays, cabin air filters play a key role in preventing outdoor air pollutants transporting inside vehicles; hence, in-cabin air quality can be strongly associated with the filtration performance of cabin air cleaning solutions. However, challenges are existing in a standard method for assessing the performance of a cabin air filter in real-life driving conditions. This study is to develop a low-cost mobile test method for monitoring in-vehicle PM and CO2 and evaluating the performances of cabin air filters while driving the vehicles. The results reveal that certain boundary conditions are important to have a proper method for evaluating the particle removal efficiency. For example, recirculation ventilation can lead to high PM2.5 removal efficiency regardless of the status and performance of a cabin air filter, and the remarkable increase in CO2 in a short time is an obvious indicator of the activation of recirculation. Fresh air ventilation is effective in maintaining the in-cabin freshness without the built-up of interior CO2; however, drivers can be exposed to a high level of PM2.5 concentrations with cabin air filters of poor performance. For the vehicles involved in this study, the average PM2.5 removal efficiencies were about 17-50% under fresh air with existing installed cabin air filters (more than 3 months since installed). With a brand-new filter (original cabin air filter and CabinAir Nordzoneā„¢ filter), the vehicle could filter out about 80-86% of outdoor PM2.5. The application of ionization technology together with the Nordzoneā„¢ filter was proven to further enhance the PM2.5 removal efficiency by up to 97%. Future work would be of great interest to investigate the aging performance of those optimized cabin air filters and the contribution of ionization, as a promising technology to improve the performance of cabin air filters, on those aged filters in real-driving environments.