Stall detection and thermal protection of vehicular systems having an electric motor
US6548975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2001 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Jun 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicular system includes a controller and an electric motor in signal communication with the controller for receiving current and rotating at speed; while the controller includes a first function responsive to a signal indicative of the speed of the electric motor, a filter responsive to a signal indicative of the heat generation rate of the vehicular system, a second function in signal communication with the first function and the filter, and a limit calculation function in signal communication with the second function for providing a motor current limit responsive to the second function; wherein a method for controlling the vehicular system includes receiving a signal indicative of the heat generation rate of the vehicular system, receiving a signal indicative of a speed of the electric motor, providing a scale factor or an overload value in response to the received signal indicative of speed, filtering the received signal indicative of heat generation rate in correspondence with a time constant, processing the filtered signal by executing a multiplication by the scale factor or a comparison with the overload value to produce a signal indicative of compliance with a duty cycle…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.