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. 18, 2014
Filed:
Nov. 15, 2010
Yuji Kariatsumari, Yamatotakada, JP;
Hayato Komatsu, Ama-gun, JP;
Terutaka Tamaizumi, Okazaki, JP;
Yoshihiro Itatsu, Okazaki, JP;
Yuji Kariatsumari, Yamatotakada, JP;
Hayato Komatsu, Ama-gun, JP;
Terutaka Tamaizumi, Okazaki, JP;
Yoshihiro Itatsu, Okazaki, JP;
JTEKT Corporation, Osaka-shi, JP;
Abstract
A motor is driven by the γ-axis current of a γδ coordinate system that is an imaginary rotating coordinate system. A command current value preparation unit sets the γ-axis command current value based on the command steering torque and the detected steering torque. The command current value preparation unit includes a command current increase/decrease amount calculation unit and an addition unit. The command current increase/decrease amount calculation unit calculates the current increase/decrease amount for the command current value based on the sign of the command steering torque and the deviation of the detected steering torque from the command steering torque. The current increase/decrease amount calculated by the command current increase/decrease amount calculation unit is added to the immediately preceding value of the command current value by the addition unit. Thus, the command current value in the present calculation cycle is calculated.