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:
Mar. 23, 2004
Filed:
Apr. 15, 2002
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In the conventional electric power steering control system, a gain by which an approximate differentiation value of a torque signal is multiplied comes to be large at high speed driving. Therefore, a problem exits in that unstable feel of steering increases, thereby steering convergence getting worse. An electric power steering control system includes a variable type torque differential operation device A that makes variable a differential time constant at the time of outputting a second motor current, and a time constant determining device X that commands the time constant to the variable type torque differential operation device A. The time constant determining device X determines the time constant in response to any change in not less than one signal selected and used in an arbitrary manner out of a speed signal , a torque signal , a yaw rate signal and a steering rate signal