Electric motor torque estimation
US8080956B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2010 |
| Grant date | Dec 20, 2011 |
| Priority date | — |
| Expiry date | Aug 26, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method of controlling a vehicle including a permanent magnet (PM) synchronous motor is provided. The motor is calibrated such that for each torque command, there are corresponding direct-axis (d-axis) and quadrature axis (q-axis) current commands. The method includes establishing a torque command T*. D-axis and q-axis current commands Id* and Iq*, respectively, corresponding to the torque command T* are determined. The motor is controlled based on Id* and Iq*. D-axis and q-axis currents Id and Iq, respectively, are measured. An output torque is estimated as a sum of the torque command T* and a torque difference. The torque difference is determined as a function of Id*, Iq*, Id, and Iq. The vehicle may be controlled based on the estimated output torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.