Hydraulic Valve Stroke Control with Force Feedback
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Solution Overview
Problem
Existing control systems for lifting tools on vehicles are overly complex and expensive, particularly in markets with simple mechanical hitch controls, making them difficult for untrained operators to use effectively.
Innovation Solution
A simplified control arrangement featuring a control unit with a position controller and force controller interacting with a controllable hydraulic valve, including a dynamometer for force measurement and a position sensor, which automatically generates a mean force setpoint for force control, reducing the need for multiple force sensors and complex control panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple force sensors and complex control elements are used to achieve accurate force control, then control comfort and accuracy are improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the force control function from complex multi-sensor systems and implements it using a single force sensor combined with an automatic mean value generation mechanism. The control system automatically determines the mean force value over a period without requiring multiple sensors, thereby reducing device complexity while maintaining control accuracy.
Solution Approach 2:
The control system performs self-service by automatically generating the mean force setpoint without requiring manual intervention or multiple sensors. The single force sensor continuously provides data that the control unit processes to determine the appropriate force control values, eliminating the need for complex sensor arrangements.
2Measurement precision
If multiple control elements are provided on the control panel to enable precise control, then control accuracy is improved, but ease of operation deteriorates for untrained operators
Solution Approach 1:
The control system automatically determines and adjusts force control parameters without requiring operator intervention. The single control element on the panel suffices because the system self-regulates based on real-time force measurements, making it intuitive and easy to operate even for untrained users.
Solution Approach 2:
The system dynamically changes control parameters based on measured force values and operational conditions. The control unit automatically adjusts the mean force setpoint and control characteristics in real-time, eliminating the need for operators to manually configure multiple control parameters.
3Device complexity
If automatic mean force setpoint generation is implemented, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
Instead of using multiple sensors to achieve high measurement precision, the patent applies partial action by using a single force sensor and compensating through automatic mean value calculation. The system processes the limited data from one sensor over time to achieve sufficient control accuracy without the complexity of multiple sensing points.
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
This solution significantly simplifies the operation of lifting tools by reducing the number of control elements and sensors, maintaining control comfort and accuracy while allowing untrained operators to easily manage lifting tool movements.
Implementation Method 1
a controllable hydraulic valve (6) for the lifting tool (2)... converts control signals from the position and force controller into lifting movements of the lifting tool (2) by means of a lifting gear cylinder (12)
Data Source
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AI summary
The invention relates to an arrangement (1) for controlling the stroke of a stroking tool (2) of a vehicle and to a method for controlling stroke. To this end, the arrangement comprises a control device (3) comprising a position controller (4) and a force controller (5) acting together with a controllable hydraulic valve (6) for the stroke tool (2). The hydraulic valve (6) is connected downstream of the position and force controllers (4, 5) and converts control signals from the position and force controllers (4, 5) into stroke motions of the stroke tool (2) by means of a stroke cylinder (12). The arrangement further comprises a tensile force measurement sensor for measuring the tensile force acting on the stroke tool and a stroke mechanism position measurement sensor for measuring the position at which the stroke tool is located. The control device (3) comprises a central control unit (9) forming an average force effort as a target value (Fsoll) for the tensile force (F) after reaching a position target value (Lsoll) set at a control panel (10) of the stroke tool (2) for a limited time (t1) or a limited travel distance (S1) when the force control is switched on. The target value (Fsoll) is fed to a differential element (1) feeding the difference between the target value (Fsoll) and an actual value (Fist) of a tensile force measurement sensor (7) to the force controller (5) as a control variable.