Guideway Vehicle Height Adjustment via Integrated Displacement
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Solution Overview
Problem
Guideway-type vehicles with rubber tires face challenges in accurately adjusting vehicle height due to weight changes, leading to imbalanced air spring pressure and inaccurate speed control, as existing height adjustment mechanisms are not sensitive enough to prevent twisting moments and require complex, costly structures.
Innovation Solution
A vehicle height adjusting mechanism that integrates relative displacement measurements at multiple positions, using a push-pull cable or lever system to adjust the elastic force of the bolster spring, enhancing sensitivity and precision without altering the dead-band or valve structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional height adjustment mechanism is used, then the vehicle can maintain basic height control, but the measurement sensitivity is insufficient to accurately detect height changes due to weight variations
Solution Approach 1:
The height measurement function is divided into multiple independent measurement points (first measurement point and second measurement point) positioned at different locations between the vehicle body and bogie. Each point provides its own displacement measurement, and the results are combined to achieve higher overall measurement sensitivity without requiring a single complex measurement system.
2Manufacturing precision
If the height adjustment sensitivity is increased to accurately respond to weight changes, then height control precision improves, but the risk of valve hunting increases
Solution Approach 1:
The displacement measurements from the first and second measurement points are combined through integration to produce a single integrated displacement value. This merging approach amplifies the overall measurement sensitivity (improving height detection capability) while the integrated nature of the signal provides smoothing that reduces high-frequency fluctuations that would trigger valve hunting.
3Measurement precision
If multiple measurement points are used to improve sensitivity, then height detection accuracy increases, but the device complexity increases
Solution Approach 1:
The measurement system uses identical measurement mechanisms at both the first and second measurement points. Each point employs the same type of displacement detection device, allowing the system to achieve enhanced measurement capability through replication rather than through increasingly complex components. The integrated device can process measurements from multiple points using a unified control architecture.
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
This solution significantly improves the sensitivity of height measurement and adjustment, ensuring the vehicle body remains within allowable level differences and prevents valve hunting, while maintaining a simple and cost-effective design.
Implementation Method 1
a bogie which supports the vehicle body via a bolster spring
Implementation Method 2
the air spring 106 is compressed and the vehicle body 102 lowers
Implementation Method 3
one end of the push-pull cable 50 being fixed to the vehicle body 12 at the second position A2 and the cable housing is mounted on the bogie 14 in a vertical direction of the first position A1
Implementation Method 4
the cable housing is mounted on the bogie 14 in a vertical direction of the first position A1
Implementation Method 5
a rotating lever 44 which rotates around a rotation shaft 46, one end of the rotating lever 44 being connected to the other end of the cable 54 via a connection rod 56 at the first position A1
Implementation Method 6
The rotation shaft 46 is integral with the valving element and protrudes outside of a casing of the leveling valve 42
Data Source
AI summary
A vehicle includes a vehicle body, a bolster spring, a bogie supporting the vehicle body via the bolster spring and a vehicle height adjusting mechanism. The vehicle height adjustment mechanism includes an integrating device, a measuring device and an elastic force adjusting device. The integrating device integrates a first relative displacement amount at a first position between the vehicle body and the bogie and a second relative displacement amount at a second position between the vehicle body and the bogie. The measuring device measures an integrated value of the first relative displacement amount and the second relative displacement amount. The elastic force adjusting device adjusts elastic force of the bolster spring based on the integrated value so as to adjust a relative displacement amount between the vehicle body and the bogie.