Work Implement Sensor Range Adjustment for Accurate Object Detection
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Solution Overview
Problem
The detection range of object sensors in work machines is reduced when attached to a movable work implement, and the changing attitude of the implement complicates accurate object detection due to shifts in sensor position and orientation.
Innovation Solution
Attaching the object sensor to the movable work implement and using a controller to calculate sensor attitude data, which includes position and orientation, to modify the detection determination range accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the object sensor is attached to the work implement, then the detection range is widened, but the detection accuracy deteriorates due to changes in sensor position and orientation
Solution Approach 1:
The patent applies the dynamics principle by making the detection determination range dynamic rather than fixed. The controller continuously adjusts the detection determination range based on real-time attitude data from the work implement. This allows the system to maintain accurate object detection despite the sensor's changing position and orientation, resolving the contradiction between widened detection range and maintained detection accuracy.
Solution Approach 2:
The patent implements feedback by using attitude sensors to continuously monitor the work implement's position and orientation, then feeding this information back to the controller. The controller uses this feedback to dynamically adjust the detection determination range, ensuring that objects are accurately detected regardless of the sensor's varying attitude, thus maintaining detection accuracy while benefiting from the wider detection range.
2Area of stationary object
If the object sensor is attached to the vehicle body, then the detection range is reduced, but the detection stability is improved
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the detection determination range to compensate for the work implement's movement. Instead of fixing the sensor on the vehicle body (which would limit detection range) or accepting unstable detection (which would happen with a fixed range when the sensor moves), the system continuously adapts the detection range parameters based on real-time attitude measurements, achieving both wide coverage and stable detection.
3Device complexity
If the detection determination range is fixed, then the system complexity is reduced, but the detection accuracy deteriorates when the work implement attitude changes
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed detection determination range to a dynamic one that adapts to the work implement's attitude. The controller calculates and adjusts the detection determination range parameters based on real-time attitude data, ensuring accurate object detection throughout the work implement's range of motion. This dynamic approach increases system complexity but is necessary to maintain detection accuracy.
Solution Approach 2:
The patent implements parameter changes by modifying the detection determination range parameters (such as detection distance thresholds and angular ranges) based on the work implement's attitude. The controller adjusts these parameters dynamically to compensate for changes in sensor position and orientation, maintaining detection accuracy without requiring a completely complex reconfiguration of the detection system.
Data Source
AI summary
A work machine includes a vehicle body, a work implement, an attitude sensor, an object sensor, and a controller. The work implement is movably attached to the vehicle body. The attitude sensor detects the attitude of the work implement. The object sensor is attached to the work implement. The object sensor detects an object in a periphery of the work machine, and outputs a signal indicating a presence of the object. The controller sets a detection determination range of the object sensor. The controller determine the presence of the object in the detection determination range based on the signal from the object sensor. The controller calculates sensor attitude data including at least one of a position and an orientation of the object sensor, based on the attitude of the work implement. The controller modifies the detection determination range in accordance with the sensor attitude data.