Work Vehicle External Power Modes for Safe Movement Control
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Solution Overview
Problem
The use of electric work vehicles as power sources poses safety concerns when users are near the traveling machine body, as movement restrictions during external power supply can be inconvenient, and unrestricted movement may lead to potential contact hazards.
Innovation Solution
A work vehicle with a traveling machine body that includes a first external power supply mode prohibiting movement and a second mode allowing movement, enabling safe and convenient operation during external power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If movement of the traveling machine body is restricted during external power supply, then safety is improved, but user convenience deteriorates
Solution Approach 1:
The patent applies dynamics by making the movement restriction state changeable based on operational mode. The control unit dynamically adjusts whether movement is permitted or prohibited depending on whether the vehicle is in work vehicle mode or power source mode, allowing the system to adapt its safety constraints to the current operational context rather than maintaining a fixed restriction state
Solution Approach 2:
The patent changes the movement permission parameter based on the operational mode. When switching from work vehicle mode to power source mode, the control unit modifies the movement restriction parameter from prohibited to permitted (or vice versa), allowing flexible adjustment of safety constraints according to the specific operational requirements
2Ease of operation
If movement of the traveling machine body is permitted during external power supply, then user convenience is improved, but safety deteriorates due to potential contact hazards
Solution Approach 1:
The system dynamically adjusts movement permission based on operational mode. When in power source mode with users nearby, the control unit permits movement only when necessary while maintaining awareness of user proximity, thereby balancing convenience with safety rather than imposing blanket restrictions
Solution Approach 2:
The control unit continuously monitors the operational mode and user proximity status, using this feedback to determine whether to permit or prohibit movement. This feedback mechanism ensures that movement decisions are based on real-time conditions, allowing the system to respond appropriately to changing safety requirements
3Adaptability or versatility
If the traveling machine body is used as a power source with users nearby, then versatility is improved, but safety risk increases due to potential contact from erroneous remote control operations
Solution Approach 1:
The patent makes the movement control dynamic based on operational mode. When the traveling machine body functions as a power source, the control unit adjusts movement permission according to the presence and position of users, allowing the system to adapt its safety behavior to the specific use case rather than maintaining a fixed control policy
Solution Approach 2:
The control unit proactively prevents harmful actions by prohibiting movement when users are in proximity and the vehicle is in power source mode, or by carefully controlling permitted movement when convenience is prioritized. This preliminary anti-action approach prevents erroneous remote control operations from causing contact hazards before they can occur
Data Source
AI summary
A work vehicle provided with a traveling machine body in which a battery is disposed includes a first external power supply mode and a second external power supply mode in which electric power can be supplied from the battery to the outside of the traveling machine body. In the first external power supply mode, movement of the traveling machine body is prohibited, and in the second external power supply mode, movement of the traveling machine body is permitted.