Chassis Dynamometer Roller Displacement for Height Stability
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Solution Overview
Problem
Twin-roller type chassis dynamometers struggle to maintain a constant vehicle height relative to the floor surface during tests, especially when simulating varying road surface friction conditions, which affects the accuracy of electric wave flow and cooling air testing.
Innovation Solution
A chassis dynamometer with a displacement unit that adjusts the position of the free roller relative to the load roller along the circumferential direction to maintain a constant vehicle height, allowing for non-contact movement and adjustment of the rollers to vary the load applied to the load roller, thereby simulating different friction coefficients without altering the vehicle's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the relative positions of the load roller and free roller are changed to simulate varying road surface friction, then the friction coefficient simulation capability is improved, but the vehicle height relative to the floor surface varies
Solution Approach 1:
The patent implements a displacement unit that dynamically adjusts the position of the free roller relative to the load roller along the circumferential direction of the wheel. This dynamic adjustment mechanism allows the system to vary the load distribution and simulate different friction coefficients while maintaining a constant vehicle height, resolving the contradiction between adaptability and shape stability.
Solution Approach 2:
The patent changes the operational parameters by moving the free roller along the circumferential direction of the wheel rather than changing the vertical position. This parameter change approach allows adjustment of the load ratio between rollers while keeping the vehicle height constant, thus improving friction simulation capability without affecting vehicle height.
2Ease of operation
If the free roller is moved to adjust load ratio, then the load distribution control is improved, but the horizontal distance between rollers changes
Solution Approach 1:
The patent segments the adjustment mechanism into two independent components: the displacement unit that moves the free roller along the circumferential direction to control load distribution, and the horizontal positioning system that maintains the horizontal distance between rollers. This segmentation allows independent control of load ratio and horizontal positioning, resolving the contradiction between ease of operation and length stability.
Data Source
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AI summary
A chassis dynamometer with improved ability to maintain a constant vehicle height relative to a floor surface is provided. The chassis dynamometer includes a displacement unit that displaces one of a load roller (2) and a free roller (3) relative to the other. In a positioned state in which the load roller (2) is positioned relative to a wheel (22), the displacement unit moves the free roller (3) in a direction toward the load roller (2) along a circumferential direction of the wheel (22) to thereby reduce a load applied to the load roller (2), and moves the free roller (3) in a direction away from the load roller (2) along the circumferential direction of the wheel (22) to thereby increase the load applied to the load roller (2).