Work Machine Load-Adaptive Travel Motor Speed Control
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Solution Overview
Problem
Work machines like lawn mowers experience nonuniform operating performance and excessive power consumption when traveling at the same speed on sites with varying loads, leading to inefficient task execution and potential motor stall.
Innovation Solution
A work machine equipped with a control unit that adjusts the rotational speed of its travel and work motors based on load variations, switching between low-speed and high-speed modes to optimize performance and energy use, using thresholds and a correspondence map to set target rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor rotates at the same speed on work sites with lighter loads and heavier loads, then the structure is simple, but excessive electric power consumption and nonuniform operating performance occur
Solution Approach 1:
The patent applies dynamics by making the motor rotational speed variable rather than fixed. The control unit dynamically adjusts the motor speed based on real-time load detection, allowing the system to adapt its operating characteristics to match actual working conditions. This resolves the contradiction by implementing a dynamic speed control system that consumes less energy during light-load operations while maintaining adequate performance during heavy-load operations.
Solution Approach 2:
The patent changes the operational parameter of motor rotational speed based on load conditions. The control unit detects load variations and adjusts the motor speed parameter accordingly - reducing speed during light-load tasks to decrease power consumption, and maintaining or increasing speed during heavy-load tasks to ensure adequate performance. This parameter adaptation resolves the energy consumption issue without sacrificing operational capability.
2Device complexity
If the motor rotates at the same speed on work sites with lighter loads and heavier loads, then the control system is simple, but nonuniform operating performance occurs
Solution Approach 1:
The patent implements feedback control by continuously detecting the load on the motor and using this information to adjust the motor speed. The control unit receives feedback about actual working conditions and modifies the motor operation accordingly, ensuring consistent and reliable performance across varying load conditions. This feedback mechanism resolves the contradiction by making the system responsive to actual needs rather than operating at a fixed speed.
Solution Approach 2:
The patent applies dynamics by making the motor rotational speed variable rather than fixed. The control unit dynamically adjusts the motor speed based on real-time load detection, allowing the system to adapt its operating characteristics to match actual working conditions. This resolves the contradiction by implementing a dynamic speed control system that consumes less energy during light-load operations while maintaining adequate performance during heavy-load operations.
3Device complexity
If the work machine travels at the same travel speed in areas with lighter loads and areas with heavier loads, then the travel control is simple, but nonuniform operating performance occurs
Solution Approach 1:
The patent implements feedback control by continuously detecting the load on the motor and using this information to adjust the motor speed. The control unit receives feedback about actual working conditions and modifies the motor operation accordingly, ensuring consistent and reliable performance across varying load conditions. This feedback mechanism resolves the contradiction by making the system responsive to actual needs rather than operating at a fixed speed.
Solution Approach 2:
The patent applies dynamics by making the motor rotational speed variable rather than fixed. The control unit dynamically adjusts the motor speed based on real-time load detection, allowing the system to adapt its operating characteristics to match actual working conditions. This resolves the contradiction by implementing a dynamic speed control system that consumes less energy during light-load operations while maintaining adequate performance during heavy-load operations.
4Reliability
If the rotational speed of the motor is increased to handle heavier loads, then the power consumption increases, but the operating performance improves
Solution Approach 1:
The patent changes the operational parameter of motor rotational speed based on load conditions. The control unit detects load variations and adjusts the motor speed parameter accordingly - reducing speed during light-load tasks to decrease power consumption, and maintaining or increasing speed during heavy-load tasks to ensure adequate performance. This parameter adaptation resolves the energy consumption issue without sacrificing operational capability.
Solution Approach 2:
The patent applies dynamics by making the motor rotational speed variable rather than fixed. The control unit dynamically adjusts the motor speed based on real-time load detection, allowing the system to adapt its operating characteristics to match actual working conditions. This resolves the contradiction by implementing a dynamic speed control system that consumes less energy during light-load operations while maintaining adequate performance during heavy-load operations.
Data Source
AI summary
A work machine (lawnmower) comprises: a main body unit having a work unit that performs a prescribed operation; and a travel motor that generates a rotational drive force that causes at least the main body unit to travel. The work machine also comprises: a travel operation unit that issues command information relating to the rotation speed of the travel motor; and a control unit that varies the rotation speed of the travel motor commanded by the travel operation unit on the basis of variation in the load on the work unit.