Riding Mower Hall Sensor Joystick for Dirt-Resistant Control
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Solution Overview
Problem
Existing riding devices, such as mowers or tractors, face challenges with mechanical switches that are susceptible to environmental factors like rain, dirt, and grass clippings, leading to reduced reliability and performance.
Innovation Solution
A non-contact switch system using Hall effect sensors to detect changes in a magnetic field generated by a magnetic body on a joystick or button, allowing for control of the riding mower's direction and functions without physical contact, enhancing resistance to environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trigger-type mechanical switch is used for controlling the riding mower, then the device complexity is reduced and ease of operation is improved, but the reliability deteriorates due to susceptibility to rain, dirt, and grass clippings
Solution Approach 1:
The patent replaces the mechanical trigger-type switch with a non-contact sensor system that detects magnetic field changes. This substitution eliminates mechanical contact components that are vulnerable to environmental factors like rain, dirt, and grass clippings, thereby significantly improving switch reliability while maintaining operational simplicity through automatic detection
Solution Approach 2:
The patent introduces a magnetic body as an intermediary between the user's manual operation and the control system. The magnetic body moves with the joystick or button, and its magnetic field changes are detected by the sensor, providing a reliable non-contact signaling mechanism that mediates between mechanical input and electronic control
2Reliability
If a non-contact sensor system is used for control, then the reliability is improved by resisting environmental factors, but the device complexity increases due to additional sensors and magnetic bodies
Solution Approach 1:
The patent implements a universal control approach where the same non-contact sensor and magnetic body system is used for multiple control functions including direction control (advance/reverse) and speed regulation. This multi-functional application reduces the need for separate control mechanisms for different operations, thereby limiting the increase in overall system complexity while maintaining high environmental resistance
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, presence/absence) as the magnetic body moves to different positions. The sensor detects these parameter changes and converts them into control signals, providing a simple yet effective method to encode multiple control commands without requiring complex mechanical switch configurations
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 non-contact switch system provides improved durability and control accuracy, reducing the likelihood of malfunction due to external conditions and enabling more flexible and convenient operation.
Implementation Method 1
at least one sensor disposed in proximity to the magnetic body and configured to sense a change in a magnetic field of the magnetic body; Each of the at least one sensor is a Hall effect sensor
Data Source
AI summary
A riding mower includes a steering wheel, a carrier, a body, a cutting assembly, a walking wheel assembly, a walking motor, a joystick, at least one sensor, and a controller, where a magnetic body is provided on the joystick, a position of the magnetic body changes according to an operation of a user, the at least one sensor is disposed in proximity to the magnetic body and configured to sense a change in a magnetic field of the magnetic body, the controller is connected to the walking motor and the at least one sensor, and the controller is configured to receive, from the at least one sensor, a value related to the change in the magnetic field of the magnetic body and control a rotational direction of the walking motor according to the value related to the change in the magnetic field.