Invention Grant
US08886381B2 Electric vehicle 有权
电动车

  • Patent Title: Electric vehicle
  • Patent Title (中): 电动车
  • Application No.: US14003350
    Application Date: 2012-03-05
  • Publication No.: US08886381B2
    Publication Date: 2014-11-11
  • Inventor: Takayoshi Ozaki
  • Applicant: Takayoshi Ozaki
  • Applicant Address: JP Osaka
  • Assignee: NTN Corporation
  • Current Assignee: NTN Corporation
  • Current Assignee Address: JP Osaka
  • Priority: JP2011-048631 20110307
  • International Application: PCT/JP2012/055532 WO 20120305
  • International Announcement: WO2012/121198 WO 20120913
  • Main IPC: B60L15/20
  • IPC: B60L15/20 B60L3/10
Electric vehicle
Abstract:
An electric vehicle includes a slip ratio estimator that estimates a slip ratio based on rotational frequencies of respective driven and drive wheels. The vehicle also includes a disturbance observer that determines an estimate of a torque attributable to external force. The vehicle also includes an estimator that may estimate an entire torque to the drive wheel, based on a motor torque command value and the estimate of torque. The vehicle also includes an estimator that estimates a coefficient of friction between a road surface and a tire, based on the entire torque and the slip ratio. The vehicle also includes a determiner that determines a maximum acceptable torque Tmax, based on the coefficient of friction and a vertical load component. Torque limitation is performed such that the motor torque command value does not exceed the maximum acceptable torque Tmax.
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