Hydraulic Vibration Control Circuit Without Pressure Sensors
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Solution Overview
Problem
Existing vibration suppression systems for work vehicles require complex hardware and software configurations due to the need for multiple pressure sensors and control routines, making them cumbersome and inefficient.
Innovation Solution
A vibration suppression control circuit that switches between ON and OFF states using a pressure-regulating valve, signal pressure supply control valve, and open/close valves to manage pressure communication between a pressure accumulator and pressure chamber, simplifying the configuration by relying on hydraulic pressure and eliminating the need for pressure sensors and complex control routines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors and control routines are used to control the communication between pressure accumulator and pressure chamber, then vibration suppression control can be achieved, but hardware and software configurations become complex
Solution Approach 1:
The pressure-regulating valve automatically compares the first signal pressure from the pressure accumulator with the second signal pressure from the pressure chamber and self-regulates the communication state based on pressure equality, eliminating the need for external pressure sensors and complex control routines while maintaining reliable vibration suppression control
Solution Approach 2:
The patent replaces the electronic control system (pressure sensors and control routines) with a hydraulic-mechanical pressure comparison mechanism in the pressure-regulating valve, which automatically determines when pressures are equal and controls valve positioning accordingly, simplifying the overall system configuration
2Reliability
If the pressure accumulator communicates with the pressure chamber when pressure difference exists, then vibration suppression can be achieved, but shocks occur to the vehicle body
Solution Approach 1:
The pressure-regulating valve preliminarily compares the first signal pressure with the second signal pressure before allowing communication between the pressure accumulator and pressure chamber, ensuring that communication only occurs when pressures are equal, thereby preventing shocks to the vehicle body while maintaining effective vibration suppression
Solution Approach 2:
The pressure-regulating valve prevents the harmful effect of pressure difference-induced shocks by establishing pressure equality as a prerequisite condition for communication between the pressure accumulator and pressure chamber, thereby eliminating the cause of vehicle body shocks before they can occur
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 effectively suppresses vibrations in work vehicles by ensuring the pressure accumulator communicates with the pressure chamber only when pressures are equal, preventing shocks and improving ride comfort while reducing system complexity.
Implementation Method 1
a first signal chamber (32p1) to which a pressure of the pressure accumulator (31) is led as a first signal pressure (PL1), and a second signal chamber (32p2) to which a pressure of the pressure chamber (4a) is led as a second signal pressure (PL2)
Implementation Method 2
a pressure accumulator (31); a pressure-regulating valve (32) including: a supply/discharge port (32c) of the pressure-regulating valve (32) connected to the pressure accumulator (31) via a supply/discharge line (43)
Data Source
Figure 1
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Figure 3
AI summary
In a vibration suppression control OFF state, a signal pressure supply control valve stops supplying a first signal pressure, a pressure-regulating valve is positioned in a first position in which a supply/discharge port is connected to a pump port, and an open/close signal pressure is not supplied to an open/close control valve, such that an open/close valve is closed. When the vibration suppression control OFF state switches to a vibration suppression control ON state, the signal pressure supply control valve allows supplying the first signal pressure, and the pressure-regulating valve is brought into a second position in which the supply/discharge port is connected to a tank port, such that a pressure of a pressure accumulator decreases. In the vibration suppression control ON state, when the pressure of the pressure accumulator has become equal to a pressure of a pressure chamber, the pressure-regulating valve is brought into a third position in which the supply/discharge port is blocked, and the open/close signal pressure is supplied to the open/close control valve, such that the open/close valve is opened.