Capacitance Control for Agricultural Vehicle Electric Drives
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Solution Overview
Problem
Agricultural vehicles with connected implements face challenges in ensuring safe electrical power management due to varying capacitance characteristics, which can lead to dangerous leakage currents, especially during maintenance or setup when users may inadvertently touch live components.
Innovation Solution
A system with an electronic controller that receives capacitance values from electric drives, sums them, and automatically or manually disconnects individual electric drives from the DC supply when the total capacitance exceeds a threshold, using a priority list to ensure safe operation by reducing capacitance to within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electric drives are connected to the DC supply in an agricultural vehicle system, then the system can perform more functions and provide greater versatility, but the total capacitance increases and creates dangerous leakage currents that threaten user safety
Solution Approach 1:
The system dynamically adjusts the capacitance configuration by selectively connecting or disconnecting Y-capacitors associated with individual electric drives based on real-time capacitance measurements. The electronic controller monitors total capacitance and automatically reconfigures the system to maintain safe operating levels while preserving maximum functionality, transforming a static safety problem into a dynamic control solution.
Solution Approach 2:
The system changes the electrical parameters of the system by selectively altering which Y-capacitors are connected to the DC supply. When capacitance exceeds safe thresholds, the controller disconnects specific drives, effectively changing the system's electrical configuration to reduce total capacitance and associated leakage currents while maintaining operational safety.
2Reliability
If the system automatically disconnects electric drives to reduce capacitance below threshold levels, then user safety is improved, but the available functionality and productivity of the vehicle system is reduced
Solution Approach 1:
The system implements continuous feedback monitoring of total capacitance levels through the electronic controller, which measures capacitance values from each electric drive and compares the sum against predetermined safety thresholds. This feedback mechanism enables automatic, real-time adjustments to system configuration, disconnecting only the minimum necessary drives to maintain safety while preserving maximum productivity.
Solution Approach 2:
The system performs self-regulation by automatically monitoring its own capacitance levels and making autonomous decisions about which electric drives to connect or disconnect. The electronic controller executes predetermined actions based on measured conditions without requiring external intervention, enabling the system to self-optimize between safety and productivity requirements.
3Reliability
If the system provides detailed capacitance monitoring and automatic disconnection capabilities, then safety control is improved, but the device complexity and cost increase
Solution Approach 1:
The electronic controller performs multiple functions: it monitors capacitance values from individual drives, calculates total system capacitance, compares measurements against safety thresholds, and executes disconnection commands. This multi-functional approach consolidates safety monitoring and control into a single device, reducing overall system complexity while maintaining comprehensive safety control capabilities.
Solution Approach 2:
The system pre-establishes safety thresholds and predetermined disconnection sequences before operation begins. The data store holds predefined threshold values and the controller has pre-programmed logic for which drives to disconnect first. This preliminary configuration simplifies real-time decision-making during operation, reducing computational complexity while ensuring safety.
Data Source
AI summary
A system and method of capacitance management in an agricultural vehicle and connected implement, wherein the vehicle and implement have a plurality of electric drives connected to a common connection and connectable to a direct current supply, and each electric drive has an associated Y capacitor between each direct current supply connection and the common connection, wherein the method includes receiving and summing capacitance values for each of the electric drives and comparing with a stored threshold value. If the threshold value is exceeded, a sequence of selective disconnections of individual electric drives is performed until the sum of the received capacitance values is less than or equal to the threshold value. The method may be performed manually, or automatically based on a sequence defined in a priority list until the sum of the received capacitance values is less than or equal to the threshold value.