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:
Oct. 24, 2023
Filed:
Dec. 26, 2019
Honda Motor Co., Ltd., Tokyo, JP;
Kenji Tsukamoto, Saitama, JP;
Satoshi Honda, Saitama, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
A bicycle electric power assist device includes: an electric motor connected in a torque transmitting relationship to a crank arm or a crankshaft driven by a pedal force; a battery; a control unit configured to control operation of the electric motor; a rotation angle sensor configured to detect a crank rotation angle position of the crankshaft; and a current sensor configured to detect a motor current, wherein the control unit includes: a pedal force estimation/calculation unit configured to estimate the pedal force of the pedals from a difference between the motor current in a first crank rotation angle position and the motor current in a second crank rotation angle position which is different from the first crank rotation angle position; and a motor drive control unit configured to control a drive current of the electric motor according to the pedal force estimated by the pedal force estimation/calculation unit.