Radar-Based Bale Length Sensor for Agricultural Baler
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Solution Overview
Problem
Conventional agricultural balers suffer from low resolution and measurement errors in estimating bale length due to the movement of sensors during actuation and retraction, leading to variability in bale size.
Innovation Solution
A radar-based length sensor is used to transmit and receive radar waves as the bale advances within the baling chamber, utilizing the Doppler Effect to estimate bale length with high resolution and accuracy, allowing for precise determination of bale length and timely initiation of the knotting cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sensor is used to monitor bale length, then the device complexity is reduced, but the measurement precision deteriorates due to low resolution and measurement errors
Solution Approach 1:
The patent replaces the mechanical star wheel sensor with a radar-based measurement system. The radar sensor transmits electromagnetic waves and measures the time delay of reflected waves to calculate bale length, eliminating mechanical contact and associated measurement errors while achieving non-contact, high-precision measurement without significant increase in system complexity
Solution Approach 2:
The patent introduces radar waves as an intermediary medium to measure bale length. Instead of direct mechanical contact between sensor and bale, the radar waves serve as a mediator that carries measurement information from the bale to the sensor, enabling accurate measurement without physical interference
2Reliability
If a star wheel sensor is used during plunger actuation, then the device complexity is minimized, but the reliability deteriorates due to sensor movement during actuation and retraction
Solution Approach 1:
The patent replaces the mechanical star wheel sensor that moves with plunger actuation with a stationary radar sensor. The radar system uses electromagnetic wave reflection to measure bale length without mechanical contact, eliminating reliability issues caused by sensor movement during plunger actuation and retraction
Solution Approach 2:
The radar sensor continuously monitors bale length throughout the entire plunger actuation cycle without requiring adjustment or repositioning. The system automatically maintains measurement capability during all phases of operation, including actuation and retraction, eliminating the need for manual intervention or complex sensor positioning mechanisms
3Manufacturing precision
If low resolution sensing is used, then the ease of manufacture is improved, but the manufacturing precision deteriorates due to variability in bale length
Solution Approach 1:
The patent replaces low-resolution mechanical sensing with high-resolution radar measurement. The radar system provides precise measurement of bale length by calculating time delay of electromagnetic wave reflection, enabling consistent bale length control without complicating the manufacturing process significantly
Solution Approach 2:
The patent changes the measurement parameter from mechanical position detection to electromagnetic wave time delay measurement. This parameter change enables high-resolution bale length measurement that directly controls bale length consistency, improving manufacturing precision while maintaining ease of implementation through non-contact measurement
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 radar-based system provides accurate and high-resolution bale length measurements, minimizing variability and ensuring consistent bale size by accurately determining the bale length and controlling the knotting process.
Implementation Method 1
A radar-based length sensor is provided in operative association with the baling chamber for transmitting radar waves towards an adjacent bale being formed within the baling chamber and receiving return waves corresponding to the radar waves as reflected off the bale
Implementation Method 2
A radar-based length sensor is used to transmit and receive radar waves as the bale advances within the baling chamber, utilizing the Doppler Effect to estimate bale length with high resolution and accuracy
Data Source
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AI summary
A system (100) for estimating the length of bales of crop material (82) during bale formation within an agricultural baler (10) includes a baling chamber (26) and a radar-based length sensor (102) provided in operative association with the baling chamber (26). The length sensor (102) is configured to transmit radar waves (104) towards a bale of crop material (82) being formed within the baling chamber (26) and receive return waves (106) corresponding to the radar waves (104) as reflected off the bale of crop material (82). In addition, the system (100) includes a controller (140) communicatively coupled to the length sensor (102). The controller (140) is configured to estimate a parameter associated with a current length (84) of the bale of crop material (82) being formed within the baling chamber (26) based at least in part on radar data associated with the return waves (106) received by the length sensor (102).