Location History:
- Kanagawa, JP (2007)
- Atsugi, JP (2010)
- Fuji, JP (2005 - 2015)
Company Filing History:
9 out of 1,022 
5 out of 13,408 
Years Active: 2005-2015
Title: Innovations of Katsumi Doihara in Continuously Variable Transmission Technology
Introduction
Katsumi Doihara is a notable inventor based in Fuji, Japan, recognized for his contributions to the field of continuously variable transmission (CVT) technology. With a total of nine patents to his name, Doihara has made significant advancements that enhance the performance and efficiency of CVTs.
Latest Patents
Among his latest patents, Doihara has developed a control method for a belt-type continuously variable transmission. This innovative method focuses on performing belt slip control by oscillating hydraulic pressure and monitoring a phase difference calculated from the oscillation components of actual hydraulic pressure and variable speed ratios. The method aims to estimate belt slip conditions and control hydraulic pressure to maintain a predetermined belt slip condition. Another significant patent involves a control device for a belt-type continuously variable transmission, which includes primary and secondary pulleys and a belt. This device controls the gear ratio based on the running radius of the belt on a pulley by managing primary and secondary oil pressures. It also features a belt slip control unit that estimates belt slip conditions and adjusts the secondary oil pressure accordingly.
Career Highlights
Katsumi Doihara has had a distinguished career, working with prominent companies such as Jatco Corporation and Nissan Motor Company Limited. His experience in these organizations has allowed him to refine his expertise in transmission technology and contribute to the development of innovative solutions in the automotive industry.
Collaborations
Throughout his career, Doihara has collaborated with esteemed colleagues, including Yoshihisa Kodama and Yasuaki Yoshikawa. These partnerships have fostered a collaborative environment that has led to the successful development of advanced transmission technologies.
Conclusion
Katsumi Doihara's work in continuously variable transmission technology exemplifies the impact of innovation in the automotive sector. His patents and collaborations highlight his commitment to enhancing vehicle performance and efficiency.