Hiroki Yasuda

Title: Hiroki Yasuda: Innovator in Air-Fuel Ratio Control Systems

Introduction

Hiroki Yasuda is a notable inventor based in Hachioji, Japan. He has made significant contributions to the field of internal combustion engine technology, particularly in air-fuel ratio control systems. With a total of 4 patents to his name, Yasuda's work has had a considerable impact on automotive engineering.

Latest Patents

Yasuda's latest patents include an innovative air-fuel ratio control system designed for carburetors in internal combustion engines. This system utilizes an O₂ sensor to detect the concentration of oxygen in exhaust gases. It features an on-off electromagnetic valve that adjusts the air-fuel ratio of the mixture supplied by the carburetor. The electronic control circuit includes a comparator that analyzes the O₂ sensor's output, an integration circuit, and a driving circuit that generates pulses to control the electromagnetic valve based on the integration circuit's output. Additionally, a detector monitors engine operation conditions and produces an engine operation signal, while a current control circuit generates an output current in response to this signal. A delay circuit is also incorporated to manage the output signal from the integration circuit.

Another significant patent is a system for controlling the air-fuel ratio in internal combustion engines. This system comprises an intake passage, an exhaust passage, and a detector, such as an oxygen sensor, that measures oxygen concentration in exhaust gases. It also includes an air-fuel mixture supply unit and an on-off type electromagnetic valve for adjusting the air-fuel ratio. The electronic control circuit produces square wave pulses based on the detector's output, driving the electromagnetic valve. The system features a venturi that creates a vacuum during rapid acceleration, along with a vacuum sensor that detects this vacuum and produces an output signal. A pulse width modulator generates a modulating signal when the vacuum sensor's output exceeds a predetermined level, enriching the air-fuel mixture during rapid acceleration.

Career Highlights

Throughout his career, Yasuda has worked with prominent companies in the automotive industry, including Fuji Jukogyo Kabushiki Kaisha and Nissan Motor Company Limited. His experience in these organizations has allowed him to refine his expertise in engine technology and contribute to innovative solutions in the field.

Collaborations

Yasuda has collaborated with notable colleagues, including Hitoshi Suzuki and Masaaki Ohgami