Automated Work Vehicle Speed and Clutch Timing at Work Start
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Solution Overview
Problem
Existing automated work vehicles face issues with work accuracy due to variations in stop positions and delays in drive transmission systems, leading to inconsistent work initiation at designated start positions.
Innovation Solution
The method involves reducing the vehicle speed before the work start position, engaging the work clutch when a predetermined threshold speed is reached, and initiating work machine operation after a set time delay to ensure precise alignment and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the work machine is driven from a position before the work start position, then the work can be started early, but the work accuracy deteriorates due to stop position variation and drive transmission delay
Solution Approach 1:
The work machine is driven in advance from a position before the work start position, but the actual work operation is delayed until the work vehicle reaches the precise work start position. This preliminary driving action allows the system to prepare while maintaining positional accuracy through controlled delay
Solution Approach 2:
The system dynamically adjusts the timing of work machine operation based on the work vehicle's actual position and speed. The work clutch engagement timing is optimized to account for drive transmission delay, ensuring the work starts at the correct position despite preliminary driving
2Productivity
If the drive transmission system is operated for extended periods, then productivity increases, but reliability deteriorates due to aging deterioration causing rattling and delay
Solution Approach 1:
The work machine is driven in advance while the work vehicle is approaching the work start position. This preliminary driving action allows the drive transmission system to be engaged earlier, maintaining productivity while the actual work operation is delayed until the correct position is reached
Solution Approach 2:
The system continuously monitors the work vehicle's position and speed to determine the optimal timing for work clutch engagement. This feedback mechanism compensates for drive transmission delay and aging effects, ensuring reliable work start timing despite extended operation periods
3Manufacturing precision
If the car speed is reduced significantly before the work start position, then work accuracy improves, but productivity deteriorates due to slower overall travel speed
Solution Approach 1:
The car speed is reduced periodically only in the specific zone before the work start position, while maintaining higher speeds during other travel periods. This periodic speed reduction achieves precise work start positioning without significantly impacting overall productivity
Solution Approach 2:
The speed reduction is applied locally only in the specific region before the work start position, rather than reducing speed throughout the entire work area. This localized approach maintains work accuracy while minimizing impact on overall productivity
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A traveling processing portion 111 causes a work vehicle 10 including a work machine 14 movable between a non-work position and a work position to travel in an automated manner along a target path. An elevation processing portion 112 moves the work machine 14 from the non-work position to the work position at a position before a work start position only by a first predetermined distance on the target path. A car-speed control processing portion 113 reduces the car speed of the work vehicle 10 to a car speed slower than a set car-speed at a position before the work start position only by a second predetermined distance. A drive processing portion 114 starts driving of the work machine 14 at the work start position or a position on an advancing direction side of the work start position.