Free-Wheeling Valve Control Using a Hydraulic Pilot Stage
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Solution Overview
Problem
Existing hydraulic control valves for vehicle traction assistance are heavy, bulky, costly, and energy-hungry due to high flow rates and the need for significant energy to switch positions, particularly in controlling free-wheeling valves.
Innovation Solution
A hydraulic control system comprising a free-wheeling valve, a hydraulic control valve, and a directional electric valve, which utilize pressure differentials and solenoids to control fluid circulation efficiently, reducing energy consumption and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a direct-control directional electrohydraulic valve is used to control the free-wheeling valve, then the motor can be engaged and disengaged quickly, but the valve becomes very heavy, bulky, costly, and energy-hungry
Solution Approach 1:
The patent introduces an intermediary hydraulic control valve that uses a small flow rate of hydraulic fluid to control the position of the free-wheeling valve. This intermediary valve is actuated by a low-power directional electric valve, which uses electrical signals to control the hydraulic fluid flow. This multi-stage control system allows the heavy free-wheeling valve to be controlled quickly while using minimal electrical power and a small directional electric valve.
2Speed
If a direct-control directional electrohydraulic valve is used to control the free-wheeling valve, then the motor can be engaged and disengaged quickly, but the valve consumes a large amount of energy
Solution Approach 1:
The patent introduces an intermediary hydraulic control valve that uses a small flow rate of hydraulic fluid to control the position of the free-wheeling valve. This intermediary valve is actuated by a low-power directional electric valve, which uses electrical signals to control the hydraulic fluid flow. This multi-stage control system allows the heavy free-wheeling valve to be controlled quickly while using minimal electrical power and a small directional electric valve.
3Object-affected harmful factors
If high flow rates circulate through the control valve to enable quick motor engagement and disengagement, then mechanical impacts and torque jolts are minimized, but the control valve requires significant energy to switch and becomes very heavy and bulky
Solution Approach 1:
The patent segments the control system into three distinct components: the free-wheeling valve that handles high flow rates for quick motor engagement/disengagement, an intermediary hydraulic control valve that uses low flow rates to control the free-wheeling valve position, and a small directional electric valve that provides electrical control signals. This segmentation allows the high flow rate function to be separated from the control function, enabling quick motor engagement while using a small, lightweight control valve.
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
Enables quick engagement and disengagement of hydraulic motors with low energy consumption and reduced size, minimizing mechanical impacts and noise, while maintaining high flow rates.
Implementation Method 1
The directional electric valve may further comprise a solenoid configured to exert a first force on the slide of the directional electric valve
Implementation Method 2
a pressure within the control chamber exerts a first force on the slide of the hydraulic control valve
Data Source
AI summary
The present invention relates to an assembly for a traction assistance hydraulic circuit of a vehicle, the assembly comprising: a free-wheeling valve (1); a hydraulic pilot valve (2) connected to the free-wheeling valve (1) and configured to drive the free-wheeling valve (1); and a directional solenoid valve (3) connected to the hydraulic pilot valve (2) and configured to control the hydraulic pilot valve (2).