Hydraulic Vibration Suppression Circuit With Shock-Free Pressure Equalization
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Solution Overview
Problem
Existing vibration suppression systems for work vehicles are complex due to the requirement of multiple pressure sensors and intricate control routines, leading to hardware and software configurations that are difficult to simplify.
Innovation Solution
A vibration suppression control circuit that includes a pressure accumulator, pressure-regulating valve, signal pressure supply control valve, and open/close valves, allowing the system to switch between ON and OFF states to absorb pressure pulsations hydraulically without immediate communication between the accumulator and pressure chamber, thereby simplifying the configuration and preventing shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors and control routines are used to control the ride control valve, then the vibration suppression control can be achieved, but the hardware and software configurations become complex
Solution Approach 1:
The pressure-regulating valve automatically regulates pressure based on the pressure difference between the pressure accumulator and pressure chamber, eliminating the need for external pressure sensors and complex control routines. The valve self-adjusts its position to maintain pressure equilibrium, achieving vibration suppression through autonomous pressure balancing.
Solution Approach 2:
The patent replaces the electronic control system (pressure sensors, controllers, and control routines) with a purely mechanical pressure-regulating valve that automatically responds to pressure differences. This mechanical substitution eliminates electronic components while achieving the same vibration suppression function.
2Reliability
If the pressure accumulator communicates with the pressure chamber, then pressure pulsation can be absorbed, but pressure shock may occur when the accumulator pressure is higher than the chamber pressure
Solution Approach 1:
The pressure-regulating valve acts as an intermediary between the pressure accumulator and pressure chamber, controlling the communication between them. It allows pressure equalization while preventing direct high-pressure shock by gradually balancing the pressures through its automatic regulation mechanism.
Solution Approach 2:
The pressure-regulating valve performs preliminary pressure balancing before full communication between the accumulator and chamber. By pre-equilibrating the pressures, it prevents harmful pressure shocks from occurring when the communication is established.
3Reliability
If the ride control valve allows communication between pressure accumulator and pressure chamber, then vibration suppression is achieved, but the valve requires complex control logic based on pressure comparisons
Solution Approach 1:
The pressure-regulating valve autonomously determines when to open or close based on the pressure difference between the accumulator and chamber. It self-regulates the communication without requiring external control logic, eliminating the need for complex control routines while maintaining effective vibration suppression.
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 configuration effectively suppresses vibrations in work apparatus and vehicle bodies by absorbing pressure pulsations when the system switches to the ON state, improving ride comfort without the need for pressure sensors or complex control routines, resulting in a more compact and efficient vibration suppression system.
Implementation Method 1
the pressure chamber communicating with the pressure accumulator, pressure pulsation of the pressure chamber can be absorbed by the pressure accumulator
Implementation Method 2
a pressure-regulating valve including a supply/discharge port connected to the pressure accumulator via a supply/discharge line, a pump port, a tank port, a first signal chamber to which a pressure of the pressure accumulator is led as a first signal pressure, and a second signal chamber to which a pressure of the pressure chamber is led as a second signal pressure
Data Source
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 in first position where a supply/discharge port connects to a pump port, and an open/close signal pressure is not supplied to an open/close control valve, so an open/close valve is closed. When the OFF state switches to ON state, the signal pressure supply control valve allows supplying the first signal pressure, and the pressure-regulating valve is in second position where the supply/discharge port connects to a tank port, so the pressure of a pressure accumulator decreases. In the ON state, when the pressure of the pressure accumulator is equal to pressure of a pressure chamber, the pressure-regulating valve is in third position where the supply/discharge port is blocked, and the open/close signal pressure is supplied to the open/close control valve, so the open/close valve is opened.