Analysis Methods of Real-World Ammonia Emissions Using Small Type On-Board Emissions Measurement System

Susumu Sato･Keigo Ashizawa･Chisato Fukunaga (Institute of Science Tokyo)･Noritsune Kawaharada (NALTEC)

In place of the PEMS used for RDE regulations, lightweight and compact on-board emission measurement devices that do not affect the vehicle weight are attracting attention. In this study, the dry-wet correction, delay time correction, and mass emission calculation necessary for analyzing NH3 emission were investigated based on the results of on-road measurements using a compact on-board emission measurement device installed in a gasoline vehicle.

Effect of Precious Metal Species and Ceria-Zirconia Composition on Oxygen Storage Distribution in Three-Way Catalyst

Yuji Tokumasu･Yuki Watanabe (Institute of Science Tokyo)･Hiroyuki Itoyama･Chengwei Huang･Tsuyoshi Ishikawa (Nissan Motor)･Tsuyoshi Nagasawa (Institute of Science Tokyo)

To enhance the performance of three-way catalyst (TWC) and develop a numerical model, elucidating the oxygen release and storage mechanisms is key. In this study, oxygen isotope labeling experiments were conducted using a model catalyst consisting of dense oxygen storage material substrate coated with a precious metal. The effects of the TWC composition, such as the precious metal and the ceria-zirconia composition, on the oxygen storage distribution inside were visualized and analyzed.

Efforts to Create a Desktop Model Calibration for Exhaust Emissions Using Catalytic Reaction Models
-Calibration of Target Air-Fuel Ratio on Engine Start for Hybrid Electric Vehicle-

Tsuyoshi Ishikawa･Hiroyuki Itoyama･Atsushi Morohoshi･Yosuke Kubota (Nissan Motor)

Calibration of the target air-fuel ratio is important for emissions performance, and has been mainly conduct a actual engines until now. In this study, we developed an environment in which the control target value can be combined with the catalytic chemical reaction model, and developed a method to examine the matching value by the model. In this paper, the case of air-fuel ratio compatibility at engine starting is introduced together with the verification results using a high-speed gas analyzer.