Keiichi Nagashima

Title: Innovations by Keiichi Nagashima

Introduction

Keiichi Nagashima is a notable inventor based in Saitama, Japan. He has made significant contributions to the field of internal combustion engine technology. With a total of 3 patents to his name, Nagashima's work focuses on enhancing engine performance and reliability.

Latest Patents

One of his latest patents is a device and method for determining the trouble of a cylinder pressure sensor. This innovative device calculates the cylinder pressure of an internal combustion engine based on the output from the cylinder sensor installed in the engine. It also calculates a drift parameter indicating the drift amount of the cylinder pressure. When the drift parameter is not within a specified range, the device determines that the cylinder pressure sensor is defective. The specified range can be set based on the behavior of the cylinder pressure, and a correction factor is obtained according to the operating state of the engine.

Another significant patent is an ignition timing controlling device and method. This method calculates the final ignition timing for performing ignition by adding a variation component to a set ignition timing. The method estimates an ignition timing characteristic curve that indicates the correlation between the indicated average effective pressure and the variation component. Optimal ignition timing is then calculated from this characteristic curve, allowing for feedback control to converge the set ignition timing to the optimal ignition timing corresponding to the current operational state of the engine.

Career Highlights

Keiichi Nagashima is currently employed at Honda Motor Co., Ltd., where he continues to innovate and develop new technologies for internal combustion engines. His work has contributed to advancements in engine efficiency and performance.

Collaborations

Throughout his career, Nagashima has collaborated with talented individuals such as Yuji Yasui and Masahiro Sato. These collaborations have fostered a creative environment that encourages innovation and problem-solving.

Conclusion

Keiichi Nagashima's contributions to engine technology through his patents demonstrate his commitment to improving automotive performance. His innovative approaches to cylinder pressure sensing and ignition timing control are paving the way for advancements in the automotive industry.