Multi-Axle Vehicle Weighing with Load-Step Validation
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Solution Overview
Problem
Existing methods for determining the total weight of a multi-axle vehicle are unreliable due to distortions caused by vehicle acceleration or braking, particularly when using multiple axle load scales in a row.
Innovation Solution
The method involves measuring load jumps at two weighbridges positioned upstream and downstream of an axle load scale, ensuring that the differences between these measurements do not exceed predetermined limits to detect and correct weight manipulations, and using a combination of dynamic and static weighing methods to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple axle load scales are arranged in a row to determine total weight, then the measurement coverage is improved, but the measurement reliability deteriorates due to distortions from vehicle acceleration or braking
Solution Approach 1:
A weighing terminal is introduced as an intermediary system that receives data from multiple axle load scales and performs centralized evaluation. The weighing terminal applies predetermined evaluation criteria to detect weight manipulations and distinguishes between legitimate weight variations and measurement distortions, thereby resolving the reliability issue while maintaining the multi-scale measurement coverage
Solution Approach 2:
The system implements feedback mechanisms where the weighing terminal continuously monitors measurements from all axle load scales and compares them against predetermined limits. When deviations are detected, the system can trigger alerts or require re-measurement, creating a closed-loop control system that maintains measurement reliability despite the use of multiple scales
2Productivity
If dynamic weighing is used to process vehicles quickly, then the productivity is improved, but the measurement precision deteriorates due to motion-induced distortions
Solution Approach 1:
The system is designed to dynamically adapt its evaluation criteria based on vehicle motion characteristics. The weighing terminal analyzes the temporal patterns of weight measurements and distinguishes between dynamic effects (acceleration, braking) and static weight conditions, allowing accurate measurement during vehicle movement without requiring the vehicle to stop
Solution Approach 2:
The evaluation parameters in the weighing terminal are configured with predetermined limits that account for dynamic measurement variations. The system adjusts its acceptance criteria based on the expected range of motion-induced weight fluctuations, maintaining measurement precision while enabling continuous dynamic weighing operations
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 approach enhances the reliability of total weight determination by minimizing measurement errors from dynamic operations, allowing for quick processing of multiple vehicles and ensuring accurate weight verification through control weights.
Implementation Method 1
as the vehicle departs from a first weighbridge located upstream of the axle load scale in the direction of travel, this weighbridge measures a first load jump, and as the vehicle approaches a second weighbridge located downstream of the axle load scale in the direction of travel, this weighbridge measures a second load jump
Data Source
Figure 1
Figure 2~3
AI summary
Disclosed is a method for determining a total weight and axle loads of a multi-axle vehicle (25), wherein all axles (27, 29, 30) of the vehicle (25) pass over an axle load scale (6) which measures one of the axle loads in each case and the total weight is determined as the sum of the axle loads. In order to reliably determine the total weight, it is proposed that for each of the axles (27, 29, 30), when the vehicle (25) departs from a first weighing bridge (5) located upstream of the axle load scale (6) in a direction of travel (2) of the vehicle (25), the first weighing bridge measures a first load step, and when the vehicle (25) approaches a second weighing bridge (7) following the axle load scale (6) in the direction of travel (2), the second weighing bridge measures a second load step, and the total weight is only considered trustworthy if, for each of the axles (27, 29, 30), differences between the first load step and the second load step from the respective axle load do not exceed predetermined limit values.