Steer-by-wire power steering system using actuators made transparent through the use of local torque and/or force control loops
US11345394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2019 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Mar 21, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steer-by-wire power steering system including a lower-level mechanism that includes a servo motor and a steered wheel, and an upper-level mechanism that includes a steering wheel and an auxiliary motor, the lower-level mechanism being closed-loop controlled, at zero force, by a lower local loop including a feedback branch that measures or estimates an actual downstream force downstream of the servo motor and upstream of the point of contact between the wheel and the ground, so as to make the servo motor transparent, while the upper-level mechanism is closed-loop controlled, at zero torque, by an upper local loop including a feedback branch which measures or estimates an actual driver torque between the auxiliary motor and the steering wheel so as to make the auxiliary motor transparent, the lower and upper local loops being controlled by a single overall controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.