Vehicle Weight Estimation by Speed-Range Resistance Modeling
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Solution Overview
Problem
Existing vehicle weight calculation methods fail to accurately account for changes in running resistance based on vehicle weight, leading to inaccuracies in weight calculation and subsequent control of actuators.
Innovation Solution
A weight calculation device that divides travel speed into specific speed ranges, acquiring and storing combinations of vehicle acceleration and driving force for each range to calculate the vehicle's weight accurately, using regression analysis to determine the weight and account for variations in running resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If running resistance is calculated based on uniform correspondence with travel speed, then calculation simplicity is improved, but measurement precision deteriorates because the correspondence changes depending on vehicle weight
Solution Approach 1:
The travel speed range is divided into multiple specific speed ranges, and the correspondence between running resistance and travel speed is determined separately for each range. This segmentation allows the system to account for weight-dependent variations in running resistance characteristics across different speed regimes, improving measurement precision while maintaining calculation feasibility through pre-established correspondence data for each segment.
2Device complexity
If vehicle weight is calculated without considering weight-dependent running resistance changes, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system pre-establishes multiple correspondences between running resistance and travel speed for different vehicle weights before actual weight calculation. These pre-prepared correspondence sets are stored in advance, allowing the calculation process to simply select and apply the appropriate correspondence based on estimated weight ranges, thereby avoiding complex real-time calculations while achieving high measurement precision.
3Ease of operation
If single correspondence is used for running resistance across all speeds, then ease of operation is improved, but reliability deteriorates due to inaccurate weight calculation affecting actuator control
Solution Approach 1:
The system dynamically selects the appropriate running resistance-travel speed correspondence based on the current specific speed range and estimated vehicle weight. This dynamic adaptation allows the control system to maintain high reliability by using weight-appropriate resistance data while keeping the operation simple through automated selection logic that adjusts parameters based on real-time operating conditions.
Data Source
AI summary
A weight calculation device includes one or more processors and one or more memories. The one or more memories are configured to store a plurality of specific speed ranges in advance, the specific speed ranges being obtained by dividing a travel speed of a vehicle into a plurality of speed ranges. The one or more processors are configured to: acquire the travel speed of the vehicle, an acceleration of the vehicle, and a driving force of the vehicle while the vehicle is traveling; store a combination of the acquired acceleration of the vehicle and the acquired driving force of the vehicle in the one or more memories in a distinguishable manner for each of the specific speed ranges; and calculate a weight of the vehicle for each of the specific speed ranges based on a plurality of the combinations of the acquired acceleration and the acquired driving force.