Keiichi Yagisawa

Title: Keiichi Yagisawa: Innovator in Exhaust Gas Purification Technology

Introduction

Keiichi Yagisawa is a notable inventor based in Saitama, Japan. He has made significant contributions to the field of internal combustion engine technology, particularly in exhaust gas purification. His innovative approach addresses critical environmental concerns related to vehicle emissions.

Latest Patents

Yagisawa holds a patent for an "Exhaust gas purifying apparatus for internal combustion engine and controller for internal combustion engine." This invention focuses on detecting the deterioration of a NOx purifying device due to sulfur contamination. When such deterioration is detected, a specific operating state flag is set, and the air-fuel ratio of the mixture supplied to the engine is varied. This variation occurs at intervals of three seconds or shorter, alternating between leaner and richer than the stoichiometric air-fuel ratio. When the temperature of the NOx purifying device exceeds a certain threshold, the air-fuel ratio is maintained richer than the stoichiometric ratio for a designated recovery period.

Career Highlights

Yagisawa is associated with Honda Giken Kogyo Kabushiki Kaisha, a leading automotive manufacturer. His work has contributed to advancements in engine efficiency and emissions control, aligning with global efforts to reduce pollution from vehicles.

Collaborations

Throughout his career, Yagisawa has collaborated with esteemed colleagues, including Kenji Sugiura and Hiroshi Ohno. These partnerships have fostered innovation and enhanced the development of cutting-edge technologies in the automotive sector.

Conclusion

Keiichi Yagisawa's contributions to exhaust gas purification technology exemplify the importance of innovation in addressing environmental challenges. His work not only advances automotive engineering but also supports the global movement towards cleaner air and sustainable transportation.