Tractor Draft Control via Engine Torque Feedback
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Solution Overview
Problem
Conventional hitch control systems for agricultural tractors are limited in their ability to maintain a constant draft load across varying field conditions and implement types, requiring manual adjustments and additional costly sensors, and are not effective for all types of implement attachments, including front hitches and towed implements.
Innovation Solution
A draft control system utilizing a digital communications bus to integrate existing engine and draft load controllers, allowing for automated adjustments of implement position based on engine load parameters, eliminating the need for dedicated sensors and improving reliability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hitch control systems use dedicated sensors to measure draft load, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses engine parameters (torque, speed, fuel injection rate) as intermediary variables to represent draft load. Instead of directly measuring draft load with sensors, the system measures engine parameters that correlate with draft load and uses these as proxies for control decisions, eliminating the need for dedicated draft load sensors
Solution Approach 2:
The system creates a virtual model of draft load by copying and processing engine parameter data already present in the tractor's control system. The draft control system replicates the functionality of direct draft load measurement by using engine parameters as a digital twin or substitute for physical sensor measurements
2Device complexity
If manual operator adjustment is used to maintain implement depth, then device complexity is reduced, but productivity decreases due to operator fatigue and constant monitoring
Solution Approach 1:
The draft control system operates autonomously using self-service principles. The control system continuously monitors engine parameters and automatically adjusts implement depth without operator intervention. The system serves itself by using its own sensor data and control algorithms to maintain optimal draft load, freeing the operator from constant monitoring and adjustment tasks
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring engine parameters (torque, speed) that indicate draft load conditions and automatically adjusting implement depth in response. The feedback mechanism compares actual engine load against desired operating conditions and makes real-time corrections, eliminating the need for manual operator adjustment while maintaining high productivity
3Measurement precision
If force sensing devices are installed on rear three-point hitches, then draft control capability is improved, but adaptability to different implement types is reduced
Solution Approach 1:
The patent implements a universal draft control system that works with all implement types (front-mounted, rear-mounted, towed) by using engine parameters as the sensing basis. Since all implements ultimately load the engine, the system provides multi-functional draft control capability without requiring implement-specific sensors or configurations, achieving true universality across different hitch types and implement configurations
Data Source
AI summary
A draft load control system for an agricultural tractor having electronic engine and draft load controllers interconnected by a digital communications bus over which parameters for engine load are made readily available to the draft load controller. The draft load control system is suitable for front-mounted, rear-mounted, or towed implements without requiring additional sensing equipment.