Electromagnetic Suspension Performance Detection
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Solution Overview
Problem
Current methods for detecting performance changes in electromagnetic suspension units are inadequate, as they rely on comparing estimated and actual values of acceleration and rotational angles, which may not accurately reflect the actual performance degradation of the suspension system.
Innovation Solution
An electromagnetic suspension system that includes a hydraulic shock absorber and an electric actuator, with a performance-change detecting device that obtains actual values of absorber-expansion/contraction-related amounts, such as displacement and velocity, to directly detect performance changes by comparing these values to estimated values, allowing for accurate judgment of performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If performance change is detected by comparing estimated and actual values of acceleration and rotational angles, then the detection method is simple to implement, but the detection precision is insufficient and may not accurately reflect actual performance degradation
Solution Approach 1:
The patent applies mechanical vibration by causing the electromagnetic suspension unit to vibrate in a vertical direction and measuring the absorber-expansion/contraction-related amount during this vibration state. This allows direct observation of the suspension unit's dynamic response characteristics, enabling accurate detection of performance changes in both the shock absorber and electric actuator without relying on indirect comparisons of acceleration and rotational angle estimates.
2Ease of operation
If vibration is applied to the electromagnetic suspension unit while the vehicle is running, then the detection can be performed during normal operation, but the vibration source may be insufficient or uncontrollable
Solution Approach 1:
The patent employs periodic action by using a vibrating device to apply controlled, periodic vibration to the electromagnetic suspension unit during detection. This ensures consistent and reliable vibration input for accurate measurement, while the detection can still be performed during vehicle operation or when stopped, maintaining operational convenience without compromising detection reliability.
Data Source
AI summary
A change of performance of an electromagnetic suspension unit is detected. When an integral Σ|Vs′−Vs*| of an absolute value of a difference between an actual value Vs* and an estimated value Vs′ of an expansion/contraction velocity of a shock absorber is larger than a performance change threshold value Sth, it is detected that the performance of the electromagnetic suspension unit is changed. Further, when an integral Σ|Vs*| of an absolute value of the actual value Vs* is larger than an integral Σ|Vs′| of an absolute value of the estimated value Vs′ by a predetermined value, performance of the shock absorber is changed such that a damping force of the shock absorber is reduced. Thus, the performance change of the electromagnetic suspension unit is detected based on the expansion/contraction velocity of the shock absorber.