Location History:
- Kobe, JP (1989)
- Toyota, JP (1991 - 1992)
- Kakogawa, JP (1991 - 1993)
Company Filing History:
8 out of 36,499 
2 out of 902 
1 out of 2 Years Active: 1989-1993
Title: Innovations of Hirofumi Yamasaki
Introduction
Hirofumi Yamasaki is a notable inventor based in Toyota, Japan. He has made significant contributions to the field of internal combustion engines, holding a total of 8 patents. His work focuses on enhancing engine efficiency and performance through innovative technologies.
Latest Patents
One of Yamasaki's latest patents is the "Lean Burn Internal Combustion Engine." This invention features a basic fuel injection amount that is calculated and multiplied by a lean correction factor, which controls the air-fuel ratio of the engine. The lean correction factor is derived from a first map based on intake pressure and engine speed. When the throttle valve opens beyond a predetermined value, a second correction map is utilized to adjust the lean correction factor. This approach also incorporates an ignition timing map based on throttle position and engine speed, optimizing performance.
Another significant patent is the "Air-Fuel Ratio Control Device for an Engine." This device adjusts the air-fuel ratio of the mixture supplied to the engine. It sets the mixture to a lean composition under low engine load and predetermined speed. As the engine load increases or speed exceeds the set threshold, the device switches to a richer mixture to enhance engine output. The set load value is dynamically adjusted according to engine speed, ensuring optimal performance.
Career Highlights
Yamasaki has worked with prominent companies such as Toyota Motor Corporation and Fujitsu Ten Limited. His experience in these organizations has allowed him to develop and refine his innovative ideas in engine technology.
Collaborations
Some of his notable coworkers include Keisuke Tsukamoto and Toshio Takaoka. Their collaboration has contributed to the advancement of engine technologies and innovations.
Conclusion
Hirofumi Yamasaki's contributions to the field of internal combustion engines demonstrate his commitment to innovation and efficiency. His patents reflect a deep understanding of engine dynamics and a drive to improve performance.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.