Compactor Weight Determination via Rolling Resistance
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Solution Overview
Problem
Compactor machines face challenges in achieving uniform compaction due to varying tire pressures and surface conditions, leading to uneven ground contact pressure and compaction effort, and lack an accurate method to determine machine weight without a scale.
Innovation Solution
An electrified compactor machine equipped with electric motors, current sensors, an angle sensor, and pressure sensors determines its weight by processing torque and angle signals, calculating rolling resistance, and displaying the weight information on a display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional scale-based weight determination is used, then weight measurement accuracy is high, but device complexity and operational convenience deteriorate due to requiring external equipment
Solution Approach 1:
The compactor machine determines its own weight using onboard sensors (motor sensors, angle sensors) and processing circuitry, eliminating the need for external scales. The system self-measures weight by calculating rolling resistance from motor torque and angle data, making the measurement device serve itself rather than requiring separate measurement equipment.
2Device complexity
If weight determination without scale is implemented, then device complexity reduces, but measurement precision deteriorates due to indirect measurement methods
Solution Approach 1:
The patent replaces the mechanical scale-based weight measurement system with an electrical/electronic measurement system. Motor sensors measure torque electrically, angle sensors measure inclination electrically, and processing circuitry calculates weight through electronic computation of rolling resistance, substituting mechanical direct measurement with electrical indirect measurement and mathematical calculation.
3Productivity
If real-time weight determination is implemented, then compaction efficiency improves, but use of energy increases due to continuous sensor operation and processing
Solution Approach 1:
The motor sensors and angle sensors serve dual purposes: they control the electric motors for compaction operations and simultaneously measure torque and angle data for weight determination. This multi-functionality allows real-time weight monitoring without requiring separate dedicated measurement systems, thereby minimizing additional energy consumption while maintaining continuous productivity.
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 method allows for accurate and real-time determination of compactor machine weight, enabling precise ballast adjustment and improved compaction efficiency by accounting for tire pressure and surface conditions.
Implementation Method 1
receiving, at a processor, from one or more motor sensors, motor-signal signaling corresponding to torque of one or more electric motors
Implementation Method 2
receiving, at the processor, from an angle sensor, angle signaling indicating an angle of incline or decline
Implementation Method 3
determining, using the processor, a weight of the electrified compactor machine using the motor-signal signaling from said receiving the motor-signal signaling and said angle signaling from said receiving the angle signaling
Data Source
AI summary
Systems, methods, and apparatuses can determine weight of a machine using rolling resistance. The machine may be electrified, either all-electrically powered or partially electrically powered. The rolling resistance can be determined based on motor signaling from one or more motor sensors that sense motor characteristics (e.g., drawn current) from one or more electric motors that drive the machine. The weight of the machine can be determined using the determined rolling resistance. Weight information can be output for display on a display and/or for storing in computer-readable storage onboard and/or offboard the machine.