The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2015
Filed:
Jan. 18, 2013
Iida Denki Kogyo Co., Ltd., Mitaka-shi, Tokyo, JP;
Zama Japan Co., Ltd., Hachimantai-shi, Iwate, JP;
Ryouhei Yamashita, Tokyo, JP;
Akira Yamazaki, Tokyo, JP;
Tamotsu Saitou, Hachimantai, JP;
Hideki Watanabe, Hachimantai, JP;
Takumi Nonaka, Hachimantai, JP;
IIDA DENKI KOGYO CO., LTD., Mitaka, JP;
ZAMA JAPAN CO., LTD., Hachimantai, JP;
Abstract
A speed reduction method for a hand-carried engine-driven working machine is provided in which a speed reduction of an engine can be attained reliably and safely by preventing the occurrence of lean come-down phenomenon in such a state that the engine is operating in a practical revolution speed range. An acceleration is calculated based on a change in revolution speed, and when the acceleration becomes smaller than a predetermined threshold, an ignition timing is retarded by a desired amount based on a determination that the engine is being decelerated, and further, a fuel flow rate is also increased, whereby the decelerated state of the engine is maintained without fail, so that the occurrence of lean come-down phenomenon is prevented in the process of reducing the revolution speed of the engine.