Hydraulic Attachment Valve Control for Shock and Reversal Response
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Solution Overview
Problem
Existing loader systems face challenges in efficiently controlling the speed of work attachments, such as earth augers, during operation, leading to inadequate soil removal and difficulty for unskilled operators to determine appropriate hydraulic pressure ranges for different attachments.
Innovation Solution
A working machine with an attachment mount portion, a work-attachment-drive hydraulic circuit, and a controller that stores operation characteristics information for various work attachments, allowing for customizable speed control and hydraulic pressure monitoring, enabling operators to select the appropriate settings based on the attached workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed of movement of the spool is reduced when the AUX control valve is switched from the supply position to the stop position in high flow mode, then shock is reduced when stopping the AUX actuator, but the AUX actuator cannot be quickly reversed or stopped when needed
Solution Approach 1:
The system dynamically adjusts the spool movement speed based on the operational state of the high flow valve. When the high flow valve is in the high flow position, the spool moves slowly to reduce shock. When the high flow valve is in the normal flow position, the spool moves quickly to enable rapid response. This dynamic adaptation resolves the contradiction between shock reduction and response speed.
Solution Approach 2:
The controller changes the parameter of spool movement speed according to the position of the high flow valve. By detecting whether the high flow valve is in high flow or normal flow position, the system adjusts the spool speed parameter accordingly, allowing the AUX actuator to operate with appropriate speed characteristics for each mode.
2Measurement precision
If a pressure gauge is attached to the work attachment to monitor hydraulic pressure, then the operator can monitor pressure status, but the pressure gauge is difficult to see under dusty conditions
Solution Approach 1:
The system introduces an intermediary device (pressure gauge mounted inside the cabin) that transfers the pressure information from the work attachment to a location visible to the operator. The pressure gauge is mounted in the cabin rather than on the external work attachment, serving as an intermediary that makes pressure information accessible in clean, visible conditions while the actual pressure measurement occurs at the work attachment.
3Reliability
If the controller reduces spool movement speed when stopping the AUX actuator in high flow mode, then shock is reduced, but soil cannot be effectively thrown off when reversing the earth auger
Solution Approach 1:
The system dynamically adjusts spool movement speed based on the operational requirements detected through the high flow valve position. When reversing the earth auger, the high flow valve is in normal flow position, allowing fast spool movement for quick response. When stopping the AUX actuator in high flow mode, the system uses slow spool movement to reduce shock. This dynamic adjustment resolves the contradiction between shock reduction and productivity.
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 allows for optimized operation of work attachments by adjusting speed and hydraulic pressure according to the specific requirements of each attachment, improving soil removal efficiency and enabling unskilled operators to safely and effectively use the loader.
Implementation Method 1
a work-attachment-drive hydraulic circuit to supply hydraulic fluid to a work attachment
Implementation Method 2
control a flow rate of hydraulic fluid supplied via the work-attachment-drive hydraulic circuit to the work attachment
Implementation Method 3
Respective solenoid valves controlled by a controller are provided to supply pilot pressure fluid to the AUX control valve
Implementation Method 4
change a speed of switching of the work-attachment-drive control valve, the speed of switching being a speed of movement of the spool
Data Source
AI summary
A working machine includes a controller to: select one of pieces of operation characteristics information corresponding to respective work attachments stored in a memory that corresponds to a work attachment attached to an attachment mount portion and fluidly connected to a hydraulic fluid port; and control, based on the selected one of the pieces of operation characteristics information, the speed of switching of a work-attachment-drive control valve when starting the work attachment and/or when stopping the work attachment.