Invention Grant
- Patent Title: Method for estimating and adjusting friction to be adjusted, and controlling hysteresis of a steering wheel torque, and corresponding power steering system
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Application No.: US17689063Application Date: 2022-03-08
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Publication No.: US11993327B2Publication Date: 2024-05-28
- Inventor: Nicolas Baudouin , Pierre Larminy
- Applicant: JTEKT EUROPE
- Applicant Address: FR Irigny
- Assignee: JTEKT EUROPE
- Current Assignee: JTEKT EUROPE
- Current Assignee Address: FR Irigny
- Agency: Oliff PLC
- Priority: FR 02976 2021.03.24
- Main IPC: B62D6/00
- IPC: B62D6/00 ; B62D5/04 ; B62D6/10
Abstract:
Method for determining a friction to be adjusted in a power steering system or for modifying a hysteresis of a steering wheel torque applied to a steering wheel of the power steering system, the method including the following steps of: determining a speed, from a measurement of a speed of a part of the power steering system and/or a measurement of the steering wheel torque; determining the friction to be adjusted on the basis of a modified LuGre model, said modified LuGre model determining the friction to be adjusted as a function of a state of the system, a time derivative of the state being determined as a function of said state of the system, the speed, a first gain, and a coulomb friction, according to an equation of the form:
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z
.
=
v
(
1
-
α
(
z
,
v
)
σ
0
z
F
c
sign
(
v
)
)
.
[
Math
1
]
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