Center for Environmental Research & Technology

Dr. Susumu Sato | Associate Professor, Institute of Science Tokyo, Japan

Time: 1:00 PM — 2:00 PM

Date: Friday, March 13, 2026

Location: Hybrid, CE-CERT RM 105 & Zoom (Join Zoom Meeting; ID: 95257250996; Passcode: 839081)

Title: Analysis of Ammonia Emissions from ICEV and HEV Equipped with Three-Way Catalysts under the Real-World Driving Conditions

Abstract: The emission of ammonia (NH₃), which is unintentionally generated during the purification process in three-way catalyst of gasoline vehicles, has become a growing concern. NH₃ emissions from vehicles can serve as a precursor to PM2.5 and have been reported to cause local roadside pollution. Therefore, there is a growing need for on-road testing to identify conditions under which NH₃ is likely to be emitted. Furthermore, since engine control strategies vary among vehicle types, it is desirable to consider differences in emission behavior across different models. This presentation describes an NH₃ measurement method combining mini PEMS with an NO x sensor and its analysis method. Based on this method, on-road NH₃ emissions were measured for multiple vehicle models with different powertrains, and the effects of engine behaviors and engine operating duration across vehicles on NH₃ emissions were investigated. To analyze differences in NH₃ emission behavior among vehicle types, conventional gasoline vehicles and series-type hybrid vehicles were compared.

Bio: Dr. Sato is an Associate Professor at Institute of Science Tokyo (formerly Tokyo Institute of Technology). He is conducting research in the area of real-world vehicle emissions with various on-board measurement techniques, prediction of vehicle emissions, and advanced after-treatment systems Prior to joining Institute of Science Tokyo, Dr. Sato was involved in several other areas of research at National Traffic Safety and Environment Laboratory including advanced motor fuels and emissions. Dr. Sato received his doctorate degree in Engineering from Keio University in 2006, and he was a Visiting Scholar at CE-CERT, University of California, Riverside from 2019 to 2020.