Yoshihiko Miyachi

Title: Innovations of Yoshihiko Miyachi

Introduction

Yoshihiko Miyachi is a notable inventor based in Kunitachi, Japan. He has made significant contributions to the field of automotive engineering, particularly in air-fuel ratio control systems. With a total of 2 patents to his name, his work has had a considerable impact on engine performance and emissions control.

Latest Patents

Miyachi's latest patents include an air-fuel ratio control system and method for horizontally opposed type engines. This innovative system features right and left exhaust pipes for each cylinder bank, along with a collecting pipe to gather gases from both pipes. The design incorporates a two-stage catalytic converter system with main catalysts for each exhaust pipe and a subsidiary catalyst in the collecting pipe. Oxygen sensors are strategically placed in each exhaust pipe to monitor air-fuel ratios, allowing for simultaneous control of both banks without the need for an auxiliary sensor. This advancement enhances the purification capability of the auxiliary catalyst.

Another significant patent by Miyachi is an air-fuel ratio control system specifically designed for idling operations of automotive engines. This system utilizes an O₂ sensor to detect oxygen concentration in exhaust gases, producing a feedback signal for controlling the air-fuel ratio. An idle switch detects when the engine is idling, updating a learning coefficient stored in a lookup table to optimize injection pulse width during idling. This innovative approach improves the efficiency of the feedback control system.

Career Highlights

Yoshihiko Miyachi is associated with Fuji Jukogyo Kabushiki Kaisha, where he has been instrumental in developing advanced automotive technologies. His expertise in air-fuel ratio control systems has positioned him as a key figure in the automotive engineering sector.

Collaborations

Miyachi has collaborated with Izuru Kawahira, working together to enhance automotive technologies and improve engine performance.

Conclusion

Yoshihiko Miyachi's contributions to automotive engineering, particularly in air-fuel ratio control systems, demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving engine efficiency and emissions control, making a lasting impact in the industry.