Motor Grader Blade Cross-Slope Control via Synchronized Actuators
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Solution Overview
Problem
Existing blade control systems for motor graders face challenges in maintaining a consistent cross-slope angle due to time delays caused by inclinometer damping, which affects the simultaneous extension or retraction of hydraulic actuators needed to adjust the blade's elevation and cross-slope.
Innovation Solution
A blade control system that includes input devices to actuate both blade ends simultaneously with the same velocity, using a controller to provide synchronized valve control signals to solenoid-operated proportional valves connected to hydraulic actuators, ensuring that both blade ends move in unison to maintain the desired cross-slope angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If inclinometer damping is used to stabilize blade inclination measurement, then measurement stability is improved, but time delay occurs in actuator response
Solution Approach 1:
The system performs preliminary action by predicting the desired actuator positions based on current blade inclination and target cross-slope requirements. The controller calculates where the actuators should be positioned in advance, compensating for the time delay introduced by inclinometer damping. This allows the system to maintain accurate cross-slope control without waiting for the dampened inclinometer signal to fully stabilize.
2Adaptability or versatility
If hydraulic actuators are controlled independently to adjust blade height and cross-slope, then control flexibility is improved, but synchronization difficulty increases
Solution Approach 1:
The system uses feedback by continuously monitoring the actual blade inclination via the inclinometer and comparing it with the target cross-slope. The controller adjusts the valve control signals to the hydraulic actuators based on this feedback, ensuring that both actuators move in a coordinated manner. This feedback mechanism maintains synchronization between the height-adjusting and cross-slope-adjusting actuators while preserving independent control capability.
3Ease of operation
If manual control input is used for blade adjustment, then operator control is improved, but response precision decreases
Solution Approach 1:
The controller acts as an intermediary between the manual input device and the hydraulic actuators. It receives the operator's manual control signal and translates it into precise valve control signals that account for the current blade inclination, target cross-slope, and actuator synchronization requirements. This intermediary function enhances the precision of manual control operations while maintaining full operator control over the blade adjustment process.
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 effectively addresses the time delay issue by enabling simultaneous movement of both blade ends, maintaining the cross-slope angle accurately and efficiently, even during elevation adjustments.
Implementation Method 1
The control provides valve control signals to a first and a second hydraulic valve to control the flow of hydraulic fluid to the first and second hydraulic actuators
Implementation Method 2
solenoid-operated proportional valves connected to hydraulic actuators
Data Source
AI summary
A blade control system for a machine. The blade control system includes an input device configured to actuate a first actuator associated with a first blade end in response to a manual command signal triggered by the input device. Further, a controller configured to receive the manual command signal indicative of the trigger initiated by the input device and actuate a second actuator associated with a second blade end with substantially same velocity as of the first actuator in response to the manual command signal.