Estimating stability margins in a steer-by-wire system
AssigneeGM Global Technology Operations LLC
InventorsBo Yu, Ibrahim A. Badiru, Scott R. Kloess
Life of this patent
Estimating the term…
Abstract
Examples of techniques for estimating stability margins in a steer-by-wire system are disclosed. In one example implementation, a method for open-loop steer-by-wire (SbW) system linearization includes linearizing, by a processing device, an open-loop SbW system at different operating points. The method further includes determining, by the processing device, an open-loop transfer function of the op en-loop SbW system. The method further includes estimating, by the processing device, margins of stability for the open-loop SbW system. The method further includes implementing the margins of stability into a vehicle to reduce instability in a steering system of the vehicle.
Claims19
A computer-implemented method for open-loop steer-by-wire (SbW) system linearization, the method comprising:
- linearizing, by a processing device, an open-loop SbW system at different operating points;
- determining, by the processing device, an open-loop transfer function of the open-loop SbW system;
- estimating, by the processing device, margins of stability for the open-loop SbW system;
- and
- implementing the margins of stability into a vehicle to reduce instability in a steering system of the vehicle.
A computer-implemented method for open-loop steer-by-wire (SbW) system identification, the method comprising:
- collecting, by a processing device, input data and output data from an open-loop SbW system;
- determining, by the processing device, an open-loop transfer function based at least in part on the collected input data and the collected output data;
- estimating, by the processing device, margins of stability for the open-loop SbW system using the open-loop transfer function;
- and
- implementing the margins of stability into a vehicle to reduce instability in a steering system of the vehicle.
A computer-implemented method for closed-loop steer-by-wire (SbW) system identification, the method comprising:
- adding, by a processing device, a disturbance signal to a closed-loop SbW system;
- determining, by the processing device, a closed-loop transfer function based on the disturbance input and a steering wheel torque command;
- estimating, by the processing device, margins of stability for the closed-loop SbW system using the closed-loop transfer function;
- and
- implementing the margins of stability into a vehicle to reduce instability in a steering system of the vehicle.
Dependencies are inferred from the claim text.