Fumihiro Hazu

Title: Fumihiro Hazu and Continuously Variable Transmission Control

Introduction

Fumihiro Hazu is an inventor associated with Anjo, Japan, and Aisin AW Co., Ltd. His patent work addresses control of continuously variable transmissions (CVTs), with a focus on managing hydraulic pressure during vehicle operation. The available information lists 1 patent for him.

Latest Patents

Hazu’s listed patent is “Transmission Device and Control Method for Continuously Variable Transmission.” It describes a control method for situations in which a CVT’s belt return has not been determined after vehicle speed falls to or below a threshold. The system repeatedly adjusts a duty solenoid to give a hydraulic actuator an intermediate pressure, using input torque and oil temperature as control factors, and performs closing control as the vehicle runs and stops.

The method is designed to prevent unintended upshifting caused by a gradual rise in actuator pressure. That pressure increase can occur when line pressure seeps through a small clearance in a flow-control valve spool. The control also allows the CVT to shift down.

Career Highlights

The available information connects Hazu’s patent activity with Aisin AW Co., Ltd. His listed invention concerns transmission control and hydraulic-pressure management, addressing a specific operating condition in a CVT.

Collaborations

Kiyoshi Kurita is identified as Hazu’s coworker. The provided information does not specify their roles or describe a particular joint project.

Conclusion

Fumihiro Hazu’s listed patent focuses on controlling hydraulic pressure to help prevent unintended CVT upshifting while allowing downshifting. It reflects his documented contribution to transmission-control technology associated with Aisin AW Co., Ltd.