Apparatus and method for producing a desired return torque in a vehicle power steering system having a rotational steering position sensor
US6039144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Jun 24, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0466
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle power steering system has a steering shaft with a rotational position sensor providing signal rollover so that each sensor output indicates a plurality of potential absolute steering positions separated from each other by multiples of a rollover angle. Upon each initiation of vehicle operation, the system selects an absolute steering positions corresponding to an initial sensor output as an unadjusted steering position and repeatedly updates the unadjusted steering position in response to sensor output changes, including sensed rollover events. The system stores data dividing a two dimensional map of possible vehicle steering operating points defined by total steering torque and steering position into a first region of likely vehicle steering system operating points, a second region of unlikely steering system operating points indicating a revolution offset in a first direction, and a third region of unlikely steering system operating points indicating a revolution offset in an opposite direction. While a minimum vehicle velocity and, optionally, other enabling conditions exist, a vehicle steering operating point derived from sensed total steering torque, the updated unad…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.