Recovery of calibrated center steering position after loss of battery power
US7295907B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2005 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D15/0235
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The steering angle of a vehicle is monitored using position sensors of an electric motor of an electric power assisted steering (EPAS) system. A position of the electric motor corresponding to the straight-ahead, center position of the steering system is stored in non-volatile memory during a steering calibration procedure, such as an end-of-line calibration in a vehicle assembly plant. Following power loss due to a dead battery, a steering angle zeroing procedure performed in a vehicle stability control (VSC) system generates a center position with enough accuracy to be within one electrical cycle of the motor. The pre-stored electric motor position is then used to determine the electrical cycle where the center position was located, and accurate monitoring of steering angle is resumed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.