Development of Real-World Emission Reduction Technologies
-(Part 3) Study on Emission Reduction by Vehicle Control Using V2X Information-

Mie Kato･Masato Ikemoto･Takahiro Tsukagoshi･Hiromasa Nishioka･Bungo Kawaguchi (Toyota Motor)

Under real-world conditions, traffic flow constantly changes, affecting engine operation and catalyst states through driver behavior, and consequently altering emission characteristics. Therefore, further reduction of real-world emissions is expected by proper coordination between traffic and vehicles. In this study, traffic information simulating V2X was reproduced in a previously developed digital twin environment, and the effectiveness of traffic–vehicle coordination in reducing emissions is demonstrated.

Development of Real-World-Emission Reduction Technologies (Fourth Report)
-Study on Emission Reduction through Driver Behavior Modification-

Masato Ikemoto･Kohei Imai･Keita Moriyama･Takahiro Tsukagoshi･Hiromasa Nishioka･Bungo Kawaguchi (Toyota Motor)･Yutaka Arakawa (Kyushu University)

Achieving real-world zero emissions requires an integrated approach encompassing powertrains, driver behavior, and traffic flow. This study investigates emission reduction through driver behavior modification using a digital twin environment. Emissions induced by driver operations were predicted in advance, and behavioral interventions were applied to drivers. The results demonstrate a measurable shift in environmental awareness and a statistically significant reduction in NOx emissions, highlighting the effectiveness of targeted driver interventions for promoting environmentally conscious driving in real-world conditions.

Improvement of HC and NOx conversion rate by detecting the oxygen amount in the catalyst at restart of 100% Electric Drive HEV

Kouichi Murakami･Atsushi Morohoshi･Tomohiro Sakata (Nissan Motor)

Reduction of exhaust gas in engine restart of 100% Electric Drive HEV was examined. Focusing on the control of the amount of oxygen absorbed by each catalyst in the multi-stage three-way catalyst system, oxygen sensors were placed between the catalysts to optimize the target air-fuel ratio. As a result, the HC and NOx conversion rates were greatly improved by the rapid consumption of oxygen in the front-stage catalyst and the retention of oxygen in the post-stage catalyst.