Vehicle electric power assist steering system and method using H-infinity control
US6250419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2000 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Feb 16, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D6/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering system (10) and method (70) for controlling the steering of a vehicle having a steering assembly including a steering wheel (12), a steering column (14) connected to said steering wheel (12), and an electric motor (20) operatively engaged with the steering assembly for supplying torque assist. A steering angle sensor (32) is employed for sensing an angular position .theta..sub.c of the steering column (14). The system has a torque estimator (40) for determining an estimated torque signal (T.sub.d est), and an H-infinity controller (64) coupled in a feedback path (44) for generating a feedback signal which is combined with a feedforward signal to generate a motor control signal (U) as a function of the estimated torque. Accordingly, the present invention provides a stable and robust control system, without sacrificing steering performance and desired steering feel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.