Motor Vehicle Load Detection via Multi-Sensor Correlation
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Solution Overview
Problem
Existing methods for detecting a motor vehicle's load are imprecise due to external interference variables, making them unsuitable for all operating situations, especially in passenger vehicles where the load proportion is low.
Innovation Solution
A system with sensor devices on the wheel and vehicle sides to detect physical variables like tire pressure, driving resistance, and engine torque, which are correlated to determine an accurate load value, using statistical methods to correct for errors and account for load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load detection is based on engine torque and driving resistance, then the measurement can be performed, but the precision is poor due to external interference variables
Solution Approach 1:
The patent combines multiple measurement methods (engine torque-based detection, driving resistance-based detection, and wheel load-based detection) into a unified system. By merging these different measurement approaches, the system can cross-validate results and compensate for the weaknesses of individual methods, thereby improving overall measurement precision while mitigating the impact of external interference variables.
Solution Approach 2:
The system continuously monitors multiple parameters and uses feedback loops to adjust and refine load detection results. By comparing measurements from different sources and using correction algorithms, the system can identify and compensate for errors caused by external interference, maintaining high precision under varying operating conditions.
2Measurement precision
If load detection is based on wheel load measurement, then the measurement can be performed, but the precision is poor when the load proportion is low
Solution Approach 1:
The patent merges wheel load measurement with engine torque and driving resistance measurements. When the load proportion is low, the combined measurement system can detect smaller changes more effectively by aggregating signals from multiple sensors, thereby maintaining measurement precision even when the payload is small relative to the vehicle weight.
Solution Approach 2:
The system performs preliminary measurements and calibrations to establish baseline values for engine torque and driving resistance under various operating conditions. This preliminary action allows the system to better detect small load changes by comparing against pre-established reference data, improving precision when load proportion is low.
3Reliability
If multiple sensor devices are used to detect load, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent designs the sensor system so that the same sensor devices serve multiple functions. For example, wheel load sensors are used not only for load detection but also for tire pressure monitoring and vehicle stability control. This multi-functionality approach increases reliability through redundant measurements while minimizing the increase in device complexity by reusing existing sensors across different detection systems.
Data Source
AI summary
A method for determining the load of a motor vehicle includes the following steps: detecting at least one physical measured variable that depends on the load and generating a measured value that represents the detected measured variable; evaluating the generated measured values in order to determine the load by correlating the generated measured values or the load values determined therefrom with each other in order to produce a correction value from the correlation, with the aid of which an actual load value is determined for the load of the motor vehicle. There is also provided a system for detecting the load of a motor vehicle, and a motor vehicle.