Invention Grant
- Patent Title: Electric power steering apparatus
- Patent Title (中): 电动助力转向装置
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Application No.: US11836410Application Date: 2007-08-09
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Publication No.: US07694777B2Publication Date: 2010-04-13
- Inventor: Masaharu Yamashita , Eiji Kasai , Ippei Yamazaki , Shuji Fujita
- Applicant: Masaharu Yamashita , Eiji Kasai , Ippei Yamazaki , Shuji Fujita
- Applicant Address: JP Toyota-shi
- Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Toyota-shi
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-218313 20060810
- Main IPC: B62D5/04
- IPC: B62D5/04
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 ωm1. If the motor rotational angular speed ωm is equal to or higher than the threshold value ωm1, 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 ωm1, a stop command signal is transmitted to the PWM voltage production unit to stop the power assist.
Public/Granted literature
- US20080035411A1 ELECTRIC POWER STEERING APPARATUS Public/Granted day:2008-02-14
Information query
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