Hydraulic Controller Common Pilot Valve Switching
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Solution Overview
Problem
The complexity and cost of controlling multiple pilot-operated hydraulic devices in working machines increase with the number of devices, as each requires a dedicated pilot pressure input switching valve, making it economically undesirable, especially for less frequently used devices.
Innovation Solution
A hydraulic controller that uses a common pilot hydraulic pressure source and pilot pressure input switching valve for multiple pilot-operated hydraulic devices, allowing remote control while prioritizing pilot pressure input based on the operating state and conditions of each device, thereby reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dedicated pilot pressure input switching valve is provided for each pilot-operated hydraulic device, then each device can be independently controlled, but the complexity and cost of the apparatus increases with the number of devices
Solution Approach 1:
The patent applies universality by enabling a single pilot pressure input switching valve to control multiple pilot-operated hydraulic devices through sequential activation. The valve is activated in response to operation of any control element, and pilot pressure is supplied to whichever device corresponds to the currently operated control element, allowing one valve to serve multiple functions that would traditionally require multiple dedicated valves.
2Ease of operation
If a dedicated pilot pressure input switching valve is provided for each pilot-operated hydraulic device, then each device can be independently controlled, but the cost of the apparatus increases
Solution Approach 1:
The patent reduces manufacturing cost by replacing multiple dedicated switching valves with a single universal switching valve that can be activated sequentially to control different hydraulic devices. This consolidation of components directly reduces the bill of materials and manufacturing complexity while maintaining the ability to independently control each device through its associated control element.
3Device complexity
If a common pilot pressure input switching valve is used for multiple pilot-operated hydraulic devices, then complexity and cost are reduced, but control priority and switching logic become more complex
Solution Approach 1:
The patent simplifies the switching control logic by using preliminary action through mechanical linkage or electrical connection between control elements and the switching valve. When a control element is operated, it directly activates the switching valve in a predetermined manner, establishing the priority sequence in advance through the physical arrangement of control elements rather than requiring complex real-time detection and decision-making logic.
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 enables efficient remote control of multiple pilot-operated hydraulic devices with reduced complexity and cost, prioritizing higher-priority devices and optimizing pilot pressure input switching control based on specific conditions, enhancing operational efficiency and reducing economic burdens.
Implementation Method 1
a pilot pressure input switching valve composed of an electromagnetic switching valve, etc. is provided between a pilot pressure input unit of the hydraulic devices and a pilot hydraulic pressure source
Data Source
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AI summary
There is provided a hydraulic controller for a working machine in which a pilot hydraulic pressure source (33) is connected in common to a plurality of pilot-operated hydraulic devices (18L,18R) each having a pilot pressure input unit (19), and a common pilot pressure input switching valve (78) is adapted to control the switching between a pilot pressure input from the pilot hydraulic pressure source (33) to each pilot pressure input unit and a relief of the input. The switching control of a pilot pressure input by the pilot pressure input switching valve (78) is performed based on the operating state of the working machine and pilot pressure input conditions of the respective pilot-operated hydraulic devices.