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:
Apr. 13, 2010
Filed:
Aug. 09, 2007
Masaharu Yamashita, Toyota, JP;
Eiji Kasai, Toyota, JP;
Ippei Yamazaki, Toyota, JP;
Shuji Fujita, Aichi-ken, JP;
Masaharu Yamashita, Toyota, JP;
Eiji Kasai, Toyota, JP;
Ippei Yamazaki, Toyota, JP;
Shuji Fujita, Aichi-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
When it is determined that a malfunction has occurred in a rotational angle sensor, an electronic control unit changes the control manner from the normal assist control to the sensorless assist control. In the sensorless assist control, an assist stop command unit receives the information concerning the motor rotational angular speed ωm from an angular speed conversion unit. Then, the motor rotational angular speed ωm is compared with the threshold value ωm. If the motor rotational angular speed ωm is equal to or higher than the threshold value ωm, an assist enabling signal is transmitted to a PWM voltage production unit to continue the power assist. On the other hand, if the motor rotational angular speed ωm is lower than the threshold value ωm, a stop command signal is transmitted to the PWM voltage production unit to stop the power assist.