Mid-PTO Detection System for Front Hitch Implements
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Solution Overview
Problem
Operators of compact utility tractors face inconvenience when trying to operate front-mounted mid-PTO driven implements while reversing, as existing systems require frequent actuation of switches to enable reverse implement options.
Innovation Solution
A detection system using a variable reluctance or Hall effect sensor mounted to a front hitch, connected to an electronic controller, allows mid-PTO driveshaft rotation when the reverse pedal is actuated, eliminating the need for manual switch actuation by detecting a specified frequency signal from the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interlock circuit is used to prevent mid-PTO operation during reverse, then safety is improved, but operational flexibility deteriorates
Solution Approach 1:
The system dynamically changes the interlock state based on real-time detection of implement presence. When a front-mounted implement is detected via the sensor, the interlock is automatically overridden, allowing mid-PTO operation during reverse. This dynamic adaptation resolves the contradiction by making the safety system flexible rather than static.
Solution Approach 2:
The sensor provides feedback to the controller about the presence of a front-mounted implement. This feedback loop enables the controller to automatically adjust the interlock circuit state, allowing reverse operation only when appropriate implements are detected, thus maintaining safety while enabling operational flexibility.
2Adaptability or versatility
If an override switch is added to allow reverse implement operation, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The system performs self-service by automatically detecting the presence of front-mounted implements and autonomously controlling the interlock circuit. This eliminates the need for manual override switches, as the sensor-controller system independently determines when reverse operation is safe, thereby improving operational flexibility without increasing device complexity.
Solution Approach 2:
The mechanical override switch is replaced with an electronic sensor-controller system. The variable reluctance or Hall effect sensor detects implement presence, and the controller electronically manages the interlock, substituting mechanical operator intervention with an automated electronic system that reduces overall complexity.
3Reliability
If manual switch actuation is required for reverse operation, then safety control is improved, but ease of operation deteriorates
Solution Approach 1:
The sensor-controller system provides self-service safety control by automatically detecting implement presence and managing the interlock circuit without requiring operator intervention. This maintains rigorous safety control while dramatically improving ease of operation, as the system handles safety decisions autonomously based on sensor input.
Solution Approach 2:
The sensor continuously monitors for implement presence in advance, preparing the interlock circuit state before reverse operation is attempted. This preliminary detection and preparation eliminates the need for manual switch actuation at the moment of operation, maintaining safety control while improving ease of operation.
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
Simplifies the operation of front-mounted mid-PTO driven implements during reverse tractor operation, ensuring continuous functionality without requiring the operator to manually engage the reverse implement option switch.
Implementation Method 1
A variable reluctance or Hall effect sensor mounted to a front hitch that supports a front-mounted implement
Implementation Method 2
A variable reluctance or Hall effect sensor mounted to a front hitch that supports a front-mounted implement
Data Source
AI summary
A detection system for front-mounted mid-PTO driven implements includes a sensor positioned adjacent a shaft connected between a mid-PTO driveshaft and a front mounted-implement. A controller may be electrically connected to the sensor, to a fuel pump solenoid, and to a reverse sense switch that indicates to the controller if a reverse pedal is actuated. When the controller receives a signal indicating the reverse pedal is actuated, the controller does not shut off the fuel pump solenoid if the controller also receives pulse signals from the sensor within a specified frequency range based on a desired PTO speed, but shuts off the fuel pump solenoid if the controller does not receive pulse signals from the sensor or receives pulse signals from the sensor outside the specified frequency range.