Steering Actuator Jerk Monitoring for Belt Jump Detection
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Solution Overview
Problem
Existing methods for monitoring steering systems, particularly in autonomous vehicles or steer-by-wire systems, face challenges in accurately detecting belt jumps and loss of traction/torque due to system stiffness and interference from manual torque applications.
Innovation Solution
The method involves determining and evaluating a jerk signal from the operating signal of the steering actuator to detect changes and determine frictional connections or torque breaks in the steering system, thereby improving detection efficiency and operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If belt jump detection is performed by evaluating manual torque applied to the steering wheel, then detection capability is provided, but detection accuracy deteriorates due to system stiffness and distortion from manual torque applications
Solution Approach 1:
The patent extracts the harmful influence of manual torque by introducing a compensation value that is subtracted from the measured torque signal. This separation allows the detection algorithm to work with a corrected torque value that reflects actual belt jump conditions rather than being distorted by normal steering operations.
Solution Approach 2:
The patent changes the evaluation parameter from raw manual torque to a corrected torque value that accounts for system stiffness. By adjusting the parameter being monitored (torque minus compensation value), the system achieves accurate detection without being affected by the inherent stiffness of the steering system.
2Productivity
If monitoring methods are designed for conventional steering systems, then detection efficiency is achieved, but adaptability deteriorates for autonomous vehicles and steer-by-wire systems
Solution Approach 1:
The patent creates a universal monitoring method that can be applied to multiple steering system types including conventional systems, autonomous vehicles, and steer-by-wire systems. The method uses operating signals from the steering actuator that are common across different system architectures, enabling one solution to serve multiple functions and applications.
Solution Approach 2:
The patent transitions from mechanical torque sensing to electronic operating signal evaluation. By using electrical/ electronic signals from the steering actuator rather than purely mechanical torque measurement, the system becomes adaptable to both traditional mechanical steering systems and modern electronic/steer-by-wire systems.
3Reliability
If comprehensive monitoring of steering system operation is implemented, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The patent enables the steering actuator to serve dual functions: both steering control and self-monitoring for belt jump detection. By utilizing operating signals already generated during normal actuator operation, the system achieves comprehensive monitoring without adding separate dedicated sensing components, thus maintaining reliability while limiting complexity increase.
Data Source
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AI summary
The invention relates to a method for monitoring a steering system (10), more particularly during the operation in a vehicle (12), wherein the steering system (10) comprises at least one steering actuator (14), and wherein, in order to determine a force-closure detachment and/or torque detachment in the steering system (10), at least one operating signal (16) of the steering actuator (14) is determined and evaluated. It is proposed that, in order to determine a force-closure detachment and/or torque detachment in the steering system (10), a jerk signal (18) is determined from the operating signal (16) and is monitored for changes.