Aerial Work Platform Load Detection Accuracy via Sliding Resistance Compensation
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Solution Overview
Problem
The accuracy of load detection on aerial work platforms is compromised due to changing sliding resistance between mast members as they extend and contract, affecting the reliability of load detection systems.
Innovation Solution
A vehicle with an aerial work platform is designed to include a telescopic lifting and lowering apparatus with secured sliders between mast members, a load detection system featuring a bracket member, biasing means, and a position detector, and rotatable roller members to maintain constant sliding resistance and enhance load detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lifting and lowering apparatus uses telescopic mast members that extend and contract, then the aerial work platform can achieve height adjustment and mobility, but the sliding resistance between mast members changes during operation, degrading load detection accuracy
Solution Approach 1:
The patent pre-compensates for the sliding resistance changes by calculating the relationship between mast member extension intervals and sliding resistance variations. The load detection means uses this pre-established relationship to correct detection values, thereby maintaining accurate load measurement despite the changing sliding resistance during telescopic operation
Solution Approach 2:
The patent changes the parameter of sliding resistance compensation by establishing a correspondence between mast member extension intervals and sliding resistance values. By detecting the current extension interval and referencing the pre-stored sliding resistance data, the system dynamically adjusts the load detection calculation to account for varying friction conditions
2Device complexity
If load detection means uses hydraulic cylinder working pressure to detect mounted load, then the system can detect load without additional sensors, but the changing sliding resistance during mast extension/contraction degrades detection accuracy
Solution Approach 1:
The patent pre-calculates and stores the relationship between mast member extension intervals and sliding resistance changes. This preliminary data preparation allows the simple hydraulic pressure-based detection system to be corrected using pre-computed compensation values, maintaining both simplicity and accuracy
Solution Approach 2:
The patent introduces a feedback mechanism where the detected mast member extension interval is used to retrieve the corresponding sliding resistance value from stored data, which then feeds back into the load calculation process to correct the detection result, thereby compensating for the inherent inaccuracies of the simple hydraulic pressure measurement
Data Source
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AI summary
A load detection means (180) that finds the live load on a work platform by detecting a load applied to a fifth mast member (150) is provided on the fifth mast member (150) provided on the work platform; a plurality of sliders (top-rear side fourth slider (155), bottom-rear side fourth slider (156), top-front side fourth slider (157), and bottom-front side fourth slider (158)) that allows the fifth mast member (150) and the fourth mast member to move relative to each other is provided in different locations in the vertical direction between the fifth mast member (150) and the fourth mast member; and the plurality of sliders are fixed to the fifth mast member (150).