Rear Sensor Lift Control for Work Machine Mis-Detection
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Solution Overview
Problem
Conventional work vehicles, such as agricultural tractors, face efficiency decreases due to rear sensors mis-detecting the work machine as an obstacle, leading to inefficient operation.
Innovation Solution
A work vehicle equipped with a control unit that sets a regulation height based on the rear sensor's detection of the work machine during trial lifting, ensuring the work machine is lifted and lowered below a certain height to avoid mis-detection, and includes a lift arm sensor for precise control of the pivot angle to prevent mis-setting of the regulation height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear sensor detects objects behind the machine body to prevent obstacles, then safety is improved, but the work machine is mis-detected as an obstacle causing work efficiency to decrease
Solution Approach 1:
The system changes the detection parameters of the rear sensor based on the height position. When the work machine is in the working height range, the sensor's detection function is selectively adjusted to avoid mis-detection, while maintaining obstacle detection capability at other heights. This resolves the contradiction by making detection accuracy height-dependent rather than uniform.
Solution Approach 2:
The control unit preliminarily determines the height position of the work machine before obstacle detection occurs. By knowing the expected height range of the work machine in advance, the system can preemptively adjust sensor sensitivity or detection thresholds to prevent mis-detection, allowing the work machine to operate without being incorrectly identified as an obstacle.
2Device complexity
If the regulation height is set based on single sensor detection, then setting process is simplified, but mis-setting occurs due to false obstacle detection
Solution Approach 1:
The system uses feedback from multiple trial lifting detections to determine the regulation height. The control unit performs multiple detection cycles during trial lifting operations, collects detection results, and uses this feedback information to accurately determine the regulation height while filtering out false obstacle detection signals. This multi-cycle feedback approach improves measurement precision without excessive complexity.
Solution Approach 2:
The system performs excessive trial lifting operations (more than the minimum single action) to ensure accurate regulation height setting. By conducting multiple trial lifts with detection, the system gathers sufficient data to accurately determine the regulation height while eliminating the possibility of mis-setting due to false obstacle detection in a single measurement.
Data Source
AI summary
A work vehicle includes a travelling vehicle body; a work machine mounted on a rear portion of the travelling vehicle body to be capable of being lifted and lowered; a control unit for controlling lifting and lowering of the work machine; and a rear sensor provided on the rear portion of the travelling vehicle body and configured to detect an object present behind the travelling vehicle body. The control unit may be configured to set a regulation height based on a height where the rear sensor detects the work machine while the work machine is lifted and then regulate lifting of the work machine during work in such a manner that a height of the work machine is kept less than or equal to the regulation height.