Electromagnetic Valve Steering Shock Reduction in Wheel Loaders
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Solution Overview
Problem
Existing work vehicles experience shock when starting and returning the steering wheel due to sudden rises in load pressure, and existing solutions complicate the hydraulic circuit by requiring separate cushioning circuits for each operation.
Innovation Solution
A work vehicle with a steering wheel, steering cylinder, steering valve, feed line, return line, and electromagnetic valve, where the controller opens the electromagnetic valve upon detecting a sudden rise in oil pressure and closes it after a predetermined time, simplifying the configuration to reduce shock and correct knob dislocation during both steering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate cushioning circuit is added for reducing shock when returning the steering wheel, then shock reduction during steering return is improved, but the hydraulic circuit becomes overly complex
Solution Approach 1:
The electromagnetic valve is designed to perform multiple functions: it acts as a cushioning valve during steering return operations and as a knob dislocation correction valve during normal steering operations. By controlling the electromagnetic valve's opening and closing based on steering state detection, the system achieves shock reduction during steering return without requiring a separate dedicated cushioning circuit, thus maintaining hydraulic circuit simplicity while addressing multiple problems
2Object-affected harmful factors
If a cushioning circuit is added to reduce shock when starting to turn the steering wheel, then shock reduction during steering start is improved, but the hydraulic circuit becomes complex when also adding a separate cushioning circuit for steering return
Solution Approach 1:
The electromagnetic valve serves dual purposes: providing cushioning action during both steering start and steering return operations. The controller detects the steering state (whether the vehicle is turning or returning) and activates the electromagnetic valve accordingly, allowing one valve to replace what would traditionally require two separate cushioning circuits
Solution Approach 2:
The electromagnetic valve's function dynamically changes based on the steering state. During steering return, it operates as a cushioning valve to reduce shock. During normal steering operations, it operates as a knob dislocation correction valve. This dynamic adaptation allows the system to address different problems at different times using the same component
3Manufacturing precision
If the electromagnetic valve is opened to correct knob dislocation, then knob dislocation correction is improved, but shock reduction capability may be affected
Solution Approach 1:
The controller continuously monitors the steering state and vehicle operation status to determine when to activate the electromagnetic valve for knob dislocation correction versus when to activate it for shock reduction during steering return. This feedback-based control ensures that the electromagnetic valve performs the appropriate function based on real-time conditions, preventing interference between correction and cushioning operations
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
The solution effectively reduces shock and corrects knob dislocation with a simple configuration, improving operational ease and reducing hydraulic circuit complexity when starting and returning the steering wheel.
Implementation Method 1
The electromagnetic valve is disposed between the feed line and the return line. The controller is configured to open the electromagnetic valve in response to returning of the steering wheel and a sudden rise in an oil pressure in the feed line
Data Source
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AI summary
This wheel loader (1) has a steering wheel (8), a left steering cylinder (4a), a steering valve (12), a left line (13), a right line (14), an electromagnetic valve (16a), and a controller (17). The electromagnetic valve (16a) is disposed between the left line (13) and the right line (14). The controller (17) opens the electromagnetic valve (16a) in response to a sudden rise in the oil pressure in the left line (13).