Method and apparatus for controlling an electric assist motor using a modified blending filter
US6789641B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2002 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | Sep 16, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0463
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method for controlling an electric assist motor (50) for providing steering assist in response to a sensed torque signal (&tgr;s) includes the step of filtering the sensed torque signal to provide a low frequency torque signal (&tgr;sL) and a high frequency torque signal (&tgr;sH). A low frequency assist torque signal (&tgr;assistLF) is determined as a function of the low frequency torque signal (&tgr;sL). A high frequency assist gain signal (Kmax) is determined as a function of the sensed torque signal (&tgr;s) and a sensed vehicle speed (&ngr;). The high frequency assist gain signal (Kmax) is applied to the high frequency torque signal (&tgr;sH) to determine a high frequency assist torque signal (&tgr;assistHF) A torque command signal (&tgr;cmd) is determined as a function of the low frequency assist torque signal (&tgr;assistLF) and the high frequency assist torque signal (&tgr;assistHF) The electric assist motor (50) is commanded to provide steering assist in accordance with the torque command signal (&tgr;cmd).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.