Front Linkage Hydraulics Connection Detection to Prevent Misactuation
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Solution Overview
Problem
Agricultural tractors with front linkages experience undesired movements or deflections when hydraulic drive units or control facilities are connected, due to the lack of control devices in the front region, leading to potential accidents and operational inefficiencies.
Innovation Solution
A method involving an electrically actuated control valve with a hydraulic coupling and sensor units to detect connection states, deactivating the operating unit if a hydraulic consumer is connected, and using a cut-off valve to prevent unintended actuation of the front linkage, ensuring safe and controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a control valve is used to control both the hydraulic lifting device of a front linkage and a hydraulic consumer of an attachment device, then the versatility of the hydraulic system is improved, but undesired movements or deflections occur at the attachment device when the hydraulic lifting device is actuated
Solution Approach 1:
A sensor unit detects whether a hydraulic consumer is connected to the control valve and provides this information as feedback to the control unit. The control unit uses this feedback to automatically deactivate the operating unit for the front linkage when a hydraulic consumer is detected, preventing undesired movements at the attachment device while maintaining system versatility
Solution Approach 2:
The system performs preliminary detection of hydraulic consumer connection status before allowing operation of the front linkage. The sensor unit continuously monitors the connection state, and the control unit proactively deactivates the operating unit in advance when a hydraulic consumer is detected, preventing potential operational conflicts before they occur
2Ease of operation
If the operating unit for the front linkage is always active, then the ease of operation is improved, but accidental activation causing undesired movements occurs
Solution Approach 1:
The sensor unit provides continuous feedback about the hydraulic consumer connection status to the control unit. This feedback mechanism enables the control unit to dynamically adjust the activation state of the operating unit, keeping it active when safe (no hydraulic consumer connected) and deactivating it when a hydraulic consumer is connected, thus preventing accidental activation while maintaining ease of operation when appropriate
Data Source
AI summary
A method is provided for detecting inadmissible operating states of a work hydraulics of an agricultural tractor. The method includes providing at least one electrically actuated control valve, a branch allocated to the at least one control valve, and an operating unit for the manual actuation of the work hydraulics of a front linkage. The method also includes connecting the at least one electrically actuated control valve to a hydraulic consumer via a hydraulic coupling, supplying hydraulic fluid to a hydraulic lifting device of the front linkage, detecting a state variable indicative of a connection state of the hydraulic coupling by a sensor unit and communicated to a control unit, and deactivating the operating unit if the control unit identifies by way of the evaluation of the state variable that a hydraulic consumer is connected to the hydraulic coupling.