Hydraulic Controller Using Bowden Cable for Engine Speed
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Solution Overview
Problem
Existing hydraulic systems for rescue and recovery tools face inefficiencies due to the need for mechanical drive of pumps in mobile systems, complexity from separate electrical connections, and the requirement of multiple control devices for independent hydraulic circuits, which complicates setup and operation in emergency situations.
Innovation Solution
A control unit that uses a Bowden cable to mechanically control the internal combustion engine speed based on hydraulic fluid pressure, allowing a single device to manage multiple tools without separate electrical connections, and incorporates a manual valve for fluid circulation, simplifying setup and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical proximity switches and servomotors are used to control drive speed, then drive speed control is achieved, but device complexity increases and robustness decreases
Solution Approach 1:
The patent replaces electrical control components (proximity switches, servomotors) with a purely mechanical control system. The deflection of the floating piston is detected mechanically, and the drive speed is controlled through a mechanical linkage system that directly connects the piston deflection to the carburetor adjustment, eliminating vulnerable electrical components while achieving the same control function.
Solution Approach 2:
The control system uses the hydraulic fluid flow itself to control the drive speed. When hydraulic fluid flows through the system, it causes the floating piston to deflect, which automatically adjusts the carburetor and thereby controls the engine speed. The system self-regulates based on the actual hydraulic conditions without requiring separate sensing and actuation systems.
2Adaptability or versatility
If separate control devices are used for each hydraulic circuit, then each circuit can be controlled independently, but device complexity and setup time increase
Solution Approach 1:
The patent designs a universal control device that can control multiple independent hydraulic circuits simultaneously. The floating piston is exposed to hydraulic fluid from multiple circuits, and its deflection responds to the combined pressure conditions. A single mechanical linkage system then controls the drive speed based on the overall hydraulic state, allowing one control device to manage multiple circuits that would otherwise require separate controllers.
3Ease of operation
If electrical lines are connected from tools to the internal combustion engine, then control signals can be transmitted, but system complexity and vulnerability increase
Solution Approach 1:
The patent eliminates the need for electrical connections between the hydraulic tool and the internal combustion engine by using a mechanical control system. The control is achieved through the hydraulic fluid pressure itself, which mechanically deflects the floating piston, and through mechanical linkages that transmit this deflection to the carburetor. This purely mechanical-hydraulic control system replaces vulnerable electrical wiring with robust mechanical components.
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 enhances energy efficiency and reduces complexity by enabling single-device control of multiple tools, improving power output and setup speed, while eliminating the need for vulnerable electrical components, thus better suited for emergency operations.
Implementation Method 1
If the pressure of the hydraulic fluid increases as a result of the actuation of one of the at least two or two connected tools, then one or both pistons are moved from the rest position to the switching position
Implementation Method 2
The control unit is particularly simple if the cable of the control unit is designed as a Bowden cable and if a drive control system, which is advantageously designed as a carburetor of the internal combustion engine, is provided for the drive and is connected to the end of the rod or cable
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a controller (30) having at least one input for a hydraulic fluid for controlling the speed of a hydraulic pump (10) driven by an internal combustion engine (20), characterized in that the controller has at least two inputs, that at least two pressure chamber (310, 320) are each connected to one of the inputs (31, 32), that each of the same has a piston (313, 323) displaceable under pressure from a rest position against the force of a spring (312, 322) into a switched position, and that the piston rod (311, 321) thereof engages at the end of a rod or a pull (35) in the switched position.