Working Machine Control Unit for Continuous Hydraulic Flow
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Solution Overview
Problem
Existing control systems for working machines, such as skid steer loaders, require complex manipulations to achieve continuous flow motion of hydraulic operation fluid, making it difficult to operate continuously, especially from a standstill, and often require simultaneous manipulation of multiple switches.
Innovation Solution
A working machine with a first switch, a second switch, a control unit, a solenoid valve, and a control valve that allows continuous output of a control signal to the solenoid valve when the first switch is operated after the second switch is released, enabling continuous activation of an actuator with automatic return of the second switch, simplifying the operation to continuous flow motion by manipulating the first switch to its maximum extent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system requires sequential manipulation of first switch, second switch, and release of first switch to achieve continuous flow motion, then the continuous flow motion can be achieved, but the manipulation becomes complicated and difficult to operate immediately from standstill
Solution Approach 1:
The control unit stores the operation amount detected from the first switch in advance when the second switch is pressed. This preliminary storage of data allows the system to immediately execute continuous flow motion with simplified manipulation (only pressing the second switch and manipulating the first switch to maximum extent) without requiring complex sequential operations, while still achieving reliable continuous flow motion
2Reliability
If the control system requires simultaneous manipulation of first switch and second switch to achieve continuous flow motion, then the continuous flow motion can be achieved, but the operation becomes difficult and complex
Solution Approach 1:
The control system divides the operation into two independent phases: data collection phase (when second switch is pressed, storing operation amount from first switch) and execution phase (when second switch is released, continuously outputting control signal). This segmentation eliminates the need for simultaneous manipulation of both switches, reducing operation difficulty while maintaining reliable continuous flow motion achievement
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 easy and immediate continuous flow motion by simplifying the operation to pressing and releasing the second switch and manipulating the first switch to its maximum extent, ensuring continuous activation of the actuator at maximum output power.
Implementation Method 1
a solenoid valve configured to control, based on the control signal, a pilot pressure
Implementation Method 2
a control valve configured to supply, based on the pilot pressure, the operation fluid to the actuator
Data Source
AI summary
A working machine includes: a first switch operable to set an operation amount; a second switch operable by being pressed; a control unit capable of detecting an operation of the first switch and an operation of the second switch, the control unit outputting a control signal based on the operation amount of the first switch and continuously outputting the control signal when the operation of the first switch is detected after detecting a release of the operation of the second switch under a state where the operation of the second switch is detected; an actuator configured to be activated by a hydraulic operation fluid; a solenoid valve capable of controlling, based on the control signal, a pilot pressure; and a control valve configured to supply, based on the pilot pressure, the hydraulic operation fluid to the actuator.