Test Rig Force Pick-Up Cross-Talk Compensation
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Solution Overview
Problem
Existing test rigs for vehicle tires suffer from measurement errors due to undefined cross-talk between force detection channels, leading to inaccurate determination of synchronization properties, particularly at low speeds.
Innovation Solution
A test rig with three uniaxial force pick-ups, where two are coupled to accurately determine radial forces and one to determine lateral forces, allowing for precise calibration and cross-talk adjustment, thereby eliminating temperature influences and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biaxial force pick-ups are used to determine forces along two spatial directions, then force measurement capability is improved, but undefined cross-talk between measurement channels occurs leading to measurement errors
Solution Approach 1:
The patent divides the force measurement system into three separate uniaxial force pick-ups, each measuring force in a single direction (radial or lateral). This segmentation eliminates the cross-talk problem inherent in biaxial pick-ups by ensuring that each sensor only measures its designated direction, thereby improving measurement accuracy while maintaining comprehensive force measurement capability through the combination of three sensors.
Solution Approach 2:
The patent introduces a coupling mechanism between the first and third force pick-ups that enables controlled cross-talk. This intermediary coupling allows the system to compensate for measurement errors by creating a controlled interaction between sensors, where the cross-talk is precisely managed and used to improve measurement accuracy rather than being an unwanted interference.
2Measurement precision
If multiple force pick-ups are used to determine both radial and lateral forces, then measurement completeness is improved, but device complexity increases
Solution Approach 1:
The patent designs the force pick-up system where three uniaxial sensors serve multiple functions: two sensors measure radial forces while the third measures lateral forces, and through coupling, each sensor contributes to both radial and lateral force determination. This multi-functionality allows the system to achieve complete force vector measurement with a relatively simple arrangement of three sensors rather than requiring more complex multi-axial sensors.
3Reliability
If force pick-ups are coupled to enable cross-talk, then temperature influence compensation is improved, but measurement system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism through the coupling between force pick-ups, where the measurement from one sensor is used to compensate for temperature influences on another sensor. The coupling creates a feedback loop that allows the system to detect and correct temperature-induced measurement errors, improving reliability while the coupling mechanism itself remains a relatively simple mechanical or electrical connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise and accurate determination of tire forces with reduced temperature influence and cross-talk errors, allowing for reliable radial and lateral force measurements.
Implementation Method 1
force pick-ups for the determination of a radial force that acts upon the drum axle and a lateral force that acts upon the drum axle
Implementation Method 2
the first force pick-up and the third force pick-up are coupled with one another so that when a force acts upon one of the two force pick-ups a controlled cross-talk takes place on the respective other force pick-up
Data Source
AI summary
Disclosed is a test rig (1) for testing vehicle tires. In one embodiment, the test rig includes a rotating drum (2) on a drum axle (3) and force pick-ups (4, 5, 6) for the determination of a radial force acting on the drum axle (3) and a lateral force acting on the drum axle (3). In one embodiment, the test rig (1) has three uniaxial force pick-ups (4, 5, 6), such that a first and a second force pick-up (4, 5) are arranged so as to determine a radial force, where a third force pick-up (6) is arranged so as to determine a lateral force, and where the first force pick-up (4) and the third force pick-up (6) are coupled. Also disclosed is a method for testing vehicle tires.