Air Qualities in 2050, What it is like, carbon neutral society?
-Impact Analysis of Automobile Tailpipe and Non-Tailpipe Emissions-

Yusuke Yasukawa･Hiroyuki Yamada (Tokyo Denki University)･Yoshiaki Yamadaya (Ibaraki University)･Tazuko Morikawa･Masamitsu Hayasaki (JARI)･Hiroe Watanabe (Nissan Motor)･Kotaro Tanaka (Ibaaraki University)･Shinichiro Okayama (Motolity)･Yoshiaki Shibata (Institute of Integrated Atmospheric Environment)･Toru Kidokoro (Toyota Motor)

We conducted air quality simulations for the year 2050 to achieve carbon neutrality in accordance with the 7th Basic Energy Plan. Furthermore, to demonstrate the effectiveness of automotive environmental measures based on these results, we performed sensitivity analyses for tailpipe emissions, non-tailpipe emissions, and both combined.

Analysis of CO2 Emissions and Cost-Effectiveness in Long-Term Scenarios for the Automotive Sector

Shuichi Kanari･Hiroshi Hirai･Takaaki Kitamura (JARI)

The authors developed a long-term CO2 emissions model for the automotive sector to analyze scenarios up to 2050. Previously, the cost analysis focused only on vehicle-specific measures, such as engine efficiency and vehicle prices. This study newly incorporates costs for traffic flow management and optimized vehicle utilization. This enables the calculation of integrated costs in the automotive sector. Finally, CO2 reduction costs were evaluated based on the Strategic Energy Plan.

Effect of Fabrication Parameters on CO Oxidation Characteristics of Three-Way Catalyst Microparticles Membrane on Gasoline Particulate Filter

Eugene Gatete･Tsuyoshi Nagasawa (Institute of Science Tokyo)

This paper investigate effect of membrane fabrication parameters on CO oxidation for advanced gasoline particulate filters with three ways catalytic TWCGPF functionality. Using ultrasonic spray, TWC microparticles were generated at 700 and deposited onto GPF wall. CO oxidation were conducted to investigate catalytic performance of metal amounts and sintering temperatures. Comparing both two and four times precious metal loadings over standard TWC/GPF fired at 900, the light-off temperature T50 decreased the catalyst performance by 4.196 and 9.091 percent, however it led to an increase of CO conversion rate at full conversion temperature T100 by 33.984 and 32. 031 percent respectively

Emission Characteristics and Evaluation Method of Solid Particle Number from Diesel Engines Equipped with a Periodically Regenerating DPF

Ayumi Shimura (NALTEC)

In periodically regenerating DPFs, changes in filtration efficiency cause significant variations in SPN emissions. Immediately after regeneration, reduced filtration efficiency results in increased SPN emissions and variability. This study evaluates SPN emission characteristics in heavy duty diesel engines equipped with a periodically regenerating DPF and proposes a simple and appropriate evaluation method for SPN emissions during certification testing.

A Study on Changes in Exhaust Gas Performance During the Use Process of Heavy-Duty Trucks Equipped with Urea SCR System

Toshiro Yamamoto (NALTEC)

For heavy-duty truck equipped with urea SCR systems, we conducted periodic chassis dynamometer tests as their accumulated mileage increased from 150,000 km to 500,000 km, and continuously collected emissions data from the same vehicle. Based on this, we analyzed changes in exhaust gas performance by examining emissions of NOx, PM, N₂O, and other pollutants during the use process, and investigated the causes of these changes. Analysis revealed that as the accumulated mileage increased, the SCR catalyst temperature decreased to approximately 25°C to 30°C. It was considered possible that this caused changes in NOx, PM, and N₂O emissions.

Feasibility Study of Applying a Honeycomb Structure for Direct Air Capture on Vehicles

Ryosuke Sakuma･Kota Kaneyama･Kazuto Miura･Hideyuki Toyoshima･Tetsuo Toyoshima (NGK)

To evaluate the feasibility of applying a honeycomb structure for direct air capture (DAC) on vehicles, airflow during vehicle operation was simulated and CO₂ adsorption behavior was examined. Based on the relationship between airflow and adsorption kinetics obtained, the appropriate structure volume and replacement frequency were assessed.