Robotic Mower Height Adjustment via Motor Parameter Feedback
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Solution Overview
Problem
Existing robotic mower systems have complex and unstable adjustment mechanisms for achieving different mowing heights, which complicates the process and affects the precision and efficiency of cutting height adjustments.
Innovation Solution
A robotic mower system with a height adjustment mechanism that includes an adjustment motor and a control unit, which detects working parameters such as current, voltage, and back electromotive force to determine extreme cutting positions and adjust the cutting height, using a sensorless motor and a control circuit to manage the cutting assembly's movement along a first axis, allowing for precise cutting height control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex adjustment mechanism is used to achieve different mowing heights, then the cutting height adjustment capability is improved, but the structural complexity increases and stability deteriorates
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with an electric motor-driven system. The motor (230) drives the cutting assembly (120) to move vertically along the first axis through electrical control, eliminating the need for complex mechanical linkages, levers, and adjustment linkages that were previously required to achieve different cutting heights.
Solution Approach 2:
The control unit (1311) automatically identifies the cutting height by detecting the working parameters of the motor (230) and determines extreme cutting positions without requiring external intervention or complex mechanical position indicators. The system self-regulates the cutting height adjustment process through motor parameter monitoring.
2Device complexity
If manual adjustment of cutting height is used, then the structure is simple, but the adjustment precision and efficiency deteriorate
Solution Approach 1:
The control unit (1311) continuously monitors the working parameters of the motor (230) during cutting height adjustment and uses this feedback to precisely determine when extreme cutting positions are reached. This closed-loop control ensures accurate and repeatable cutting height settings without requiring complex mechanical positioning mechanisms.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an electrically-driven system controlled by the control unit (1311). The motor (230) provides precise, controlled movement of the cutting assembly (120) along the first axis, enabling accurate cutting height adjustment without the imprecision inherent in manual mechanical systems.
3Device complexity
If the adjustment mechanism operates without position detection, then the structure is simpler, but the ability to identify extreme positions and prevent damage deteriorates
Solution Approach 1:
The control unit (1311) uses motor working parameters (such as current, voltage, or back electromotive force) as feedback signals to identify extreme cutting positions. When the motor reaches a position where further movement could cause damage, the parameter change triggers the control unit to stop the adjustment, preventing mechanical damage without requiring additional sensors or detection mechanisms.
Solution Approach 2:
The motor (230) and control unit (1311) work together to automatically detect and respond to extreme positions through monitoring the motor's own working parameters. The system uses its operational characteristics to self-diagnose position limits, eliminating the need for separate detection systems while maintaining high reliability.
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
The system enables precise and efficient adjustment of cutting heights, preventing damage by identifying extreme positions and calibrating working parameters, ensuring accurate cutting performance and reducing maintenance costs by simplifying the adjustment process.
Implementation Method 1
The height adjustment mechanism includes an adjustment motor for generating an adjustment force for adjusting the mowing element to the different cutting heights
Implementation Method 2
the parameter detection unit is configured to detect a working parameter of the adjustment motor in a working process, and the control unit is configured to identify a cutting height of the mowing element according to the acquired working parameter, where the working parameter includes one or more of a working current, a working voltage, and a back electromotive force of the adjustment motor
Data Source
AI summary
A mower includes a mowing system for cutting grass, a housing, and a traveling assembly including walking wheels. The mowing system includes a cutting assembly, a driving mechanism, and a height adjustment mechanism. The cutting assembly includes a mowing element for cutting the grass. The height adjustment mechanism is used for adjusting a movement of the cutting assembly to have different cutting heights, where the height adjustment mechanism includes an adjustment motor for generating an adjustment force for adjusting the mowing element to the different cutting heights. The mower further includes a parameter detection unit and a control unit, where the parameter detection unit is configured to detect a working parameter of the adjustment motor in a working process, and the control unit is configured to identify a cutting height of the mowing element according to the acquired working parameter.