Work Machine Blade-Angle Detection Range Adjustment
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Solution Overview
Problem
Existing object detection systems in work machines like motor graders, which have high freedom in implement posture, fail to accurately determine the presence of objects due to insufficient adjustment of detection ranges based on the vehicle's posture.
Innovation Solution
A work machine system that includes a rotation angle sensor, object sensor, and controller to set a detection range around the machine based on the rotation angle of the blade, allowing for precise determination of object presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed detection range is used around the work machine, then the detection coverage is simple and stable, but the detection accuracy deteriorates when the blade rotation angle changes
Solution Approach 1:
The detection range is transformed from a fixed static configuration to a dynamic adjustable configuration that changes according to the blade rotation angle. The controller calculates the appropriate detection range based on real-time blade angle data, enabling the system to adapt to varying operational conditions and maintain accurate object detection across different blade positions.
Solution Approach 2:
The detection range parameters (such as detection distance, angular range, or spatial envelope) are modified as a function of the blade rotation angle. By changing these parameters dynamically, the system optimizes its detection capability for the current blade position without requiring complex hardware modifications, thus improving measurement precision while controlling device complexity.
2Reliability
If the detection range is expanded to cover all areas around the work machine, then the object detection coverage is improved, but the false alarm rate increases due to unnecessary warnings
Solution Approach 1:
Instead of using a uniform detection range for all areas, the system implements location-specific detection characteristics based on the blade rotation angle. Different regions around the work machine are assigned different detection parameters according to the current blade position, allowing the system to focus detection resources on relevant areas and reduce false alarms in areas where objects are unlikely to be detected or are irrelevant to the current operation.
Solution Approach 2:
The detection range dynamically adapts to the blade rotation angle, expanding or contracting in a controlled manner. This dynamic adjustment allows the system to maintain reliable detection coverage for areas that are currently relevant to the blade's position and operation, while reducing detection sensitivity in areas where false alarms would be most likely to occur, thus improving overall reliability without excessive false alarms.
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 accurate detection of objects around the work machine by dynamically adjusting the detection range according to the blade's rotation angle, enhancing safety and operational efficiency.
Implementation Method 1
The rotation angle sensor detects a rotation angle of the blade
Implementation Method 2
The object detection system includes a radar device such as a millimeter wave radar. The radar device detects the presence or absence of an object by emitting radio waves or ultrasonic waves and receiving the radio waves or ultrasonic waves reflected by the object
Data Source
AI summary
A work machine includes a vehicle body, a support member, a blade, a rotation angle sensor, an object sensor, and a controller. The support member is connected to the vehicle body. The blade is rotatably supported by the support member. The rotation angle sensor detects a rotation angle of the blade. The object sensor detects an object around the work machine and outputs a signal indicating a presence or absence of the object. The controller is configured to set a detection range around the work machine. The controller is configured to determine the presence or absence of the object within the detection range based on the signal from the object sensor. The controller is configured to set the detection range according to the rotation angle of the blade.