Rolling Resistance Measurement via Torque and Grade Subtraction
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Solution Overview
Problem
Existing measurement systems for determining rolling resistance of machines are complex and costly, relying on multiple sensors and complex calculations to compare individual machine resistance factors to fleet averages, which increases processing power requirements and complexity.
Innovation Solution
A method and system that calculates rolling resistance by determining drive axle torque, drivetrain efficiency loss, and actual grade values using sensors and position data, subtracting these from total effective grade to output the rolling resistance value, reducing the need for excessive sensors and complex calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors and complex calculations are used to determine rolling resistance by comparing individual machine resistance factors to fleet averages, then measurement precision is improved, but device complexity and processing power requirements increase
Solution Approach 1:
The patent extracts and eliminates unnecessary sensors and complex calculations from the rolling resistance measurement system. Instead of using multiple sensors to measure wind resistance, braking power, and continuously updating fleet averages, the invention uses a simplified approach with minimal sensors to directly measure drive axle torque and calculate rolling resistance through a straightforward formula, thereby reducing system complexity while maintaining measurement accuracy
Solution Approach 2:
The patent replaces expensive, complex sensor systems with a simpler, more cost-effective measurement approach. Instead of investing in multiple specialized sensors and continuous fleet data infrastructure, the invention uses a single torque sensor and basic position data to achieve accurate rolling resistance measurements, significantly reducing system cost and complexity
2Measurement precision
If multiple sensors and complex calculations are used to determine rolling resistance, then measurement precision is improved, but processing power requirements increase
Solution Approach 1:
The patent removes complex processing requirements from the system by eliminating the need for continuous fleet average calculations, wind resistance sensor data processing, and braking power measurements. The simplified calculation approach uses minimal processing power to compute rolling resistance from basic torque and position data, dramatically reducing energy consumption while maintaining measurement precision
3Measurement precision
If sensors and computer models are used to determine wind resistance and braking power, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for wind resistance sensors, braking power sensors, and complex computer models. Instead, it uses a direct torque measurement approach that simplifies the measurement system while maintaining precision in determining rolling resistance, removing unnecessary components and calculations from the system
Data Source
AI summary
A method of measuring rolling resistance of a machine is disclosed. The method may include determining a drive axle torque value of the machine and calculating a total effective grade value using the drive axle torque value. The method may further include determining at least one drivetrain efficiency loss factor value and calculating a total drivetrain efficiency loss value of the machine using the at least one drivetrain efficiency loss factor value. The method may also include determining position data of the machine and calculating an actual grade value based on the position data. The method may additionally include calculating a rolling resistance value of the machine by subtracting the actual grade value and the drivetrain efficiency loss value from the total effective grade value and outputting the rolling resistance value.