Work Vehicle Speed and Clutch Timing for Accurate 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 predetermined start positions.
Innovation Solution
The method involves reducing the vehicle speed before the work start position, engaging the work clutch when a threshold speed is reached, and initiating work machine operation after a predetermined 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 in advance, but the work accuracy deteriorates due to stop position variation and drive transmission delay
Solution Approach 1:
The work machine is moved to the work position before the work start position (first predetermined distance) in advance, but the actual work operation is delayed until the vehicle reaches the work start position. This preliminary positioning without premature operation allows the system to prepare while maintaining timing accuracy through controlled engagement based on speed threshold detection.
Solution Approach 2:
The system detects the vehicle speed and determines the engagement timing of the work clutch based on this feedback. By monitoring speed and engaging the work machine at a predetermined speed threshold, the system dynamically adjusts the timing to compensate for variations in stop position and transmission delay, ensuring accurate work initiation at the work start position.
2Manufacturing precision
If the car speed is reduced earlier to ensure stable operation, then the work accuracy improves, but the productivity deteriorates due to longer deceleration distance
Solution Approach 1:
The system changes the car speed parameter from the set speed to a slower speed at a specific position (second predetermined distance) before the work start position. This controlled parameter change ensures stable operation and accurate work initiation while optimizing the deceleration timing to minimize impact on productivity.
3Speed
If the work clutch is engaged earlier to prepare the work machine, then the response time improves, but the work accuracy deteriorates due to timing mismatch with the work start position
Solution Approach 1:
The engagement timing of the work clutch is determined based on feedback from speed detection. The system monitors the vehicle speed and engages the work clutch at a predetermined speed threshold, ensuring that the work machine starts operating at the correct moment when the vehicle reaches the work start position, thereby maintaining both rapid response and high accuracy.
Data Source
AI summary
A traveling processing portion causes a work vehicle including a work machine movable between a non-work position and a work position to travel in an automated manner along a target path. An elevation processing portion moves the work machine 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 reduces the car speed of the work vehicle 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 starts driving of the work machine at the work start position or a position on an advancing direction side of the work start position.