Steering system handwheel angle determination
AssigneeSteering Solutions IP Holding Corporation
InventorsCarl D. Tarum, Matthew A. Tompkins
Life of this patent
Estimating the term…
Abstract
Technical solutions are described for estimating handwheel angle of a steering wheel of a vehicle based on road wheel rotational speed data. In one or more examples, the technical solutions are used when the vehicle does not have a sensor to measure the handwheel angle, or if the handwheel angle sensor is faulted and unable to provide data on the actual handwheel angle.
Claims17
An electric power steering (EPS) system for computing handwheel angle based on wheel speeds, the EPS system comprising:
- a handwheel angle module configured to:
- receive a first wheel speed for a first wheel;
- and
- receive a second wheel speed for a second wheel;
- a calibration module configured to:
- compute a first calibration factor based on the first wheel speed and the second wheel speed using a predetermined model;
- compute a second calibration factor based on an offset error in a wheel alignment sensor;
- wherein the handwheel angle module is further configured to:
- receive the first calibration factor and the second calibration factor from the calibration module;
- and
- determine the handwheel angle based on the first wheel speed, the second wheel speed, the first calibration factor, and the second calibration factor based on
- HWA
- =
- C
-
-
- 1
- ⋆
- (
- R
- -
- L
- )
- (
- R
- +
- L
- )
- +
- C
-
-
- 2
- ,
- where HWA is the handwheel angle, R is the first wheel speed, L is the second wheel speed, C1 is the first calibration factor, and C2 is the second calibration factor.
A system for determining handwheel angle in a steering system based on wheel speeds, the system comprising:
- a handwheel angle module configured to determine a state of a handwheel position sensor, and in response to the handwheel position sensor being in an invalid state:
- receive a first wheel speed for a first wheel;
- receive a second wheel speed for a second wheel;
- determine a handwheel angle based on the first wheel speed, the second wheel speed, a first calibration factor, and a second calibration factor, wherein the handwheel angle module determines the handwheel angle based on
- HWA
- =
- C
-
-
- 1
- *
- (
- R
- -
- L
- )
- (
- R
- +
- L
- )
- +
- C
-
-
- 2
- ,
- where HWA is the handwheel angle, R is the first wheel speed, L is the second wheel speed, C1 is the first calibration factor, and C2 is the second calibration factor.
A steering system controller for determining a handwheel angle in a steering system, the steering controller configured to:
- in response to vehicle speed being below a predetermined threshold:
- receive a first wheel speed for a first wheel;
- receive a second wheel speed for a second wheel;
- compute a first calibration factor based on the first wheel speed and the second wheel speed using a predetermined model;
- compute a second calibration factor based on an offset error in a wheel alignment sensor;
- and
- determine a handwheel angle based on the first wheel speed, the second wheel speed, the first calibration factor, and the second calibration factor based on
- HWA
- =
- C
-
-
- 1
- *
- (
- R
- -
- L
- )
- (
- R
- +
- L
- )
- +
- C
-
-
- 2
- ,
- where HWA is the handwheel angle, R is the first wheel speed, L is the second wheel speed, C1 is the first calibration factor, and C2 is the second calibration factor.
Dependencies are inferred from the claim text.