Disabling controlled velocity return based on torque gradient and desired velocity error
First Claim
Patent Images
1. A power steering system comprising:
- a gain module that generates an estimated driver torque; and
a blending module for determining a blend value, the blend value is based at least in part on a derivative of the estimated driver torque, the blend value determined based on a multiplication of a torque scale factor, a torque gradient scale factor calculated from the derivative of the estimated driver torque, and a velocity error scale factor, and the blend value is applied to a return torque of a handwheel.
1 Assignment
0 Petitions
Accused Products
Abstract
A power steering system includes a gain module that generates an estimated driver torque, and a blending module for determining a blend value. The blend value is based at least in part on a derivative of the estimated driver torque, and the blend value is applied to a return torque of a handwheel.
-
Citations
17 Claims
-
1. A power steering system comprising:
-
a gain module that generates an estimated driver torque; and a blending module for determining a blend value, the blend value is based at least in part on a derivative of the estimated driver torque, the blend value determined based on a multiplication of a torque scale factor, a torque gradient scale factor calculated from the derivative of the estimated driver torque, and a velocity error scale factor, and the blend value is applied to a return torque of a handwheel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for controlling a power steering system comprising:
-
generating an estimated driver torque; and determining a blend value, the blend value is based at least in part on a derivative of the estimated driver torque, the blend value determined based on a multiplication of a torque scale factor, a torque gradient scale factor calculated from the derivative of the estimated driver torque, and a velocity error scale factor, and the blend value is applied to a return torque of a handwheel. - View Dependent Claims (9)
-
-
10. A method for controlling a power steering system comprising:
-
generating an estimated driver torque; determining a blend value, the blend value is based at least in part on a derivative of the estimated driver torque, the blend value is applied to a return torque of a handwheel; and computing a torque gradient scale factor, the torque gradient scale factor is computed based on the derivative of the estimated driver torque and a vehicle speed, the torque gradient scale factor is based on a comparison of the torque gradient scale factor with a plurality of threshold values, the plurality of threshold values comprises a full torque gradient threshold and a zero torque gradient threshold, the torque gradient scale factor is configured to reduce the return torque for derivative that exceeds the full torque gradient threshold, the derivative of the estimated driver torque indicates a rate of change of driver torque. - View Dependent Claims (11, 12)
-
-
13. A power steering system comprising:
-
a gain module that generates an estimated driver torque; and a blending module for determining a blend value, the blend value is based at least in part on a derivative of the estimated driver torque by a multiplication of a torque gradient scale factor calculated from a derivative of the estimated driver torque, a torque scale factor, and a velocity error scale factor, the blend value is applied to a return torque of a handwheel. - View Dependent Claims (14, 15, 16, 17)
-
Specification