Agricultural Sprayer Speed Control via Multi-Sensor Signal Selection
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Solution Overview
Problem
Agricultural sprayers face inaccuracies in speed feedback signals due to varying weather and crop conditions, leading to inconsistent product application rates.
Innovation Solution
A control system that receives feedback signals from multiple sensors (radar, wheel speed, GPS) and allows operators to select the most reliable signal based on current conditions, converting it into a speed feedback signal to control product application rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar signal is used to determine sprayer speed, then speed feedback is provided to control application rate, but signal accuracy deteriorates under varying weather and crop conditions
Solution Approach 1:
The system segments the speed measurement function across multiple independent sensors (radar, GPS, wheel speed sensors, transmission speed pickup) rather than relying on a single radar system. Each sensor provides speed data through different physical principles, allowing the system to divide the measurement task and select the most reliable source based on operating conditions.
Solution Approach 2:
The system changes the measurement parameter or method based on operating conditions. Instead of always using radar, the controller can switch to GPS, wheel speed sensors, or transmission speed pickup depending on weather, crop density, and field conditions, thereby adapting the measurement approach to maintain accuracy.
2Reliability
If multiple sensors are used to provide speed feedback signals, then reliability of speed determination improves, but device complexity increases
Solution Approach 1:
The control system is designed with multi-functionality to handle multiple sensor types. The controller can process speed signals from radar, GPS, wheel speed sensors, and transmission speed pickup, making it versatile enough to work with different sensor configurations depending on the operating conditions and requirements.
Solution Approach 2:
The system includes automatic sensor selection capability where the controller automatically determines which sensor provides the most reliable speed signal based on pre-programmed criteria for different operating conditions. This self-service feature reduces the burden on operators while improving reliability.
3Adaptability or versatility
If operator selection of feedback signal is implemented, then adaptability to operating conditions improves, but ease of operation decreases
Solution Approach 1:
The system provides dynamic adaptability where operators can adjust speed feedback signal selection based on real-time operating conditions such as weather, crop density, and field terrain. The system can switch between manual operator selection and automatic selection modes, allowing flexibility while maintaining ease of operation through intuitive interfaces.
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
Enhances the accuracy of speed determination and product application rates by selecting the most reliable sensor signal, reducing errors caused by environmental and crop-related interference.
Implementation Method 1
Historically, sprayers have utilized a radar signal to determine the speed at which the sprayer is traveling. The radar signal is transmitted from a radar source mounted to the sprayer, reflected off an external object and returned to a receiver on the sprayer.
Data Source
AI summary
An improved system of determining the speed at which an agricultural vehicle is traveling is disclosed. A control system for the sprayer receives feedback signals from multiple sensors, where each feedback signal may be utilized to determine the speed at which the sprayer is traveling. An operator interface, such as a touch-screen terminal, is provided to receive input from the operator for selecting one of the feedback signals. Each of the feedback signals has certain operating conditions under which they are more or less reliable. The operator may select one of the feedback signals from which the speed of the sprayer is determined according to the present operating conditions. The speed determined from the selected feedback signal is then used by the sprayer to control and record application of product to the field.