Method for supervising the operation of a power steering system

Patent metadata

Field	Value
Publication number	US-11084527-B2
Application number	US-201816772935-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 15, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

Method for monitoring the operation of a power steering system including a steering wheel, a servo motor and a monitoring module, characterized in that said method involves a step of determining at least one temporary limit value of a parameter, a step of estimating an additional value which an assistance functionality contributes to a setpoint value of the parameter, and a step of correcting the at least one temporary limit value by the additional value.

First claim

The invention claimed is:

1. A method for supervising the operation of a power steering system comprising a steering wheel, an assist motor and a supervising module wherein it comprises:
a step of determining at least one temporary limit value of a parameter;
a step of estimating an additional value provided by an assistance functionality to a setpoint value of the parameter;
a step of correcting the at least one temporary limit value by the additional value.

2. The method according to claim 1 , wherein the determination step defines a temporary maximum limit value and a temporary minimum limit value of the parameter.

3. The method according to claim 1 , wherein the estimation step calculates the additional value using a first transfer function between the setpoint value and an assistance function of the assistance functionality.

4. The method according to claim 1 , wherein the correction step adds the additional value to a temporary limit value of the parameter.

5. The method according to claim 1 , comprising a step of calculating a supplementary value provided by the assistance functionality to a modified input signal of the supervising module.

6. The method according to claim 5 , wherein the calculation step determines the supplementary value using a second transfer function between the modified input signal and the assistance function of the assistance functionality.

7. The method according to claim 5 , comprising a step of modifying the modified input signal by the supplementary value.

8. The method according to claim 7 , wherein the modification step subtracts the supplementary value from the modified input signal.

Assignees

• Jtekt Europe Sas

Inventors

• Moretti Romain
• Slama Tahar

Classifications

• B62D15/025 Primary

  Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation (B62D1/28 takes precedence) · CPC title

• B60W50/04

  Monitoring the functioning of the control system · CPC title

• B60W2510/20

  Steering systems · CPC title

• B62D5/0493 Primary

  detecting processor errors, e.g. plausibility of steering direction · CPC title

• B62D5/0463

  calculating assisting torque from the motor based on driver input · CPC title