Power Steering Supervision Using Dynamic Limit Correction
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Solution Overview
Problem
The existing power steering system supervision methods degrade when assistance functionalities are active, leading to false failure detections and compromised supervision quality, as they interfere with the normal operation of the system by modifying the setpoint values and input signals.
Innovation Solution
A method that determines temporary limit values and estimates additional values provided by assistance functionalities, correcting these values to maintain consistent supervision regardless of assistance functionality activation, using transfer functions to account for the influence on setpoint and input signals, ensuring accurate fault detection without degrading supervision when assistance is inactive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If assistance functionalities are active to modify setpoint values for driving assistance, then driving assistance capability is improved, but supervision accuracy deteriorates leading to false failure detections
Solution Approach 1:
The patent segments the torque signal into two distinct components: driver torque (input signal) and assistance torque (additional value). By separating these components and processing them independently through different transfer functions, the system can apply assistance functionalities without compromising the accuracy of supervision comparisons, thus resolving the contradiction between driving assistance capability and supervision accuracy
Solution Approach 2:
The patent introduces an intermediary computational layer that calculates temporary limit values based on driver torque, then applies assistance functionalities as an additional value. This intermediary structure allows the assistance functionality to operate without directly interfering with the supervision module's accuracy requirements, enabling both driving assistance and precise supervision to coexist
2Reliability
If limit values are modified to account for assistance functionality, then false detections are reduced, but supervision quality degrades in normal operation
Solution Approach 1:
The patent implements dynamic adjustment of limit values based on the operational state. Temporary limit values are calculated dynamically from driver torque, and assistance functionality is applied dynamically as an additional value when needed. This dynamic approach ensures that supervision quality is maintained in normal operation while false detections are reduced when assistance is active
Solution Approach 2:
The patent changes parameters (limit values and setpoint values) based on the operational mode. By calculating temporary limit values and applying assistance as an additional value rather than permanently modifying the supervision parameters, the system maintains high supervision quality in normal operation while reducing false detections when assistance functionalities are active
Data Source
AI summary
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.