Kazunari Shirai

Title: Kazunari Shirai: Innovator in Motor Control Technology

Introduction

Kazunari Shirai is a notable inventor based in Chita-gun, Japan. He has made significant contributions to the field of motor control technology, holding a total of 5 patents. His work focuses on enhancing the efficiency and reliability of motor operations, particularly in automotive applications.

Latest Patents

One of his latest patents is titled "Motor drive control with excess current period timer resetting." This invention involves a microcomputer that generates drive command signals for starting and braking a motor, ensuring that the position of a throttle valve is accurately controlled. The system limits the current supplied to the motor to prevent it from exceeding a first current limitation value during motor drive start and braking. If the current limitation persists for a predetermined time, it is further restricted to a second current limitation value. The microcomputer also detects the switching of the motor current supply direction and produces a reset command signal to reset the timer operation for current limitation determination.

Another significant patent is "Engine throttle control with varying control constants." In this invention, an Engine Control Unit (ECU) performs feedback control on a direct current (d.c.) motor using PID feedback control. This method reduces errors between the actual throttle opening and the command throttle opening. The PID control constants Kp, Ti, and Td are adjusted based on various operating conditions of the vehicle, such as engine idle speed control, vehicle traction control, and cruise control.

Career Highlights

Kazunari Shirai has worked with prominent companies in the automotive industry, including Nippondenso Co., Ltd. and Denso Corporation. His experience in these organizations has allowed him to develop innovative solutions that enhance motor control systems.

Collaborations

Throughout his career, Shirai has collaborated with talented individuals such as Yoshimasa Nakaya and Hidemasa Miyano. These partnerships have contributed to the advancement of technology in motor control.

Conclusion

Kazunari Shirai's contributions to motor control technology have made a significant impact in the automotive sector. His innovative patents demonstrate his commitment to improving the efficiency and reliability of motor operations. His work continues to influence the development of advanced motor control systems.