Electric Work Vehicle Relay Timing for End-of-Work Data Capture
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Solution Overview
Problem
Electric work vehicles face challenges in reducing power consumption of data collectors, especially when the main power supply is stopped, and in reliably collecting data at the end of a work session while minimizing unnecessary power usage.
Innovation Solution
The electric work vehicle incorporates a first power storage that can switch between power supply and non-supply states, a second power storage, a motor, a data collector, a switch operation tool, and a relay that allows the data collector to continue acquiring data from the second power storage after the first power storage is switched off, and then blocks current flow to directly turn off the data collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data collector continues to operate after the main power supply is stopped, then data collection at the end of work is ensured, but power consumption increases unnecessarily
Solution Approach 1:
The relay is configured to automatically maintain current flow for a predetermined period after the main power supply is stopped. This preliminary action ensures that the data collector continues to operate long enough to complete data collection at the end of work, while the system automatically cuts power after this period expires, preventing unnecessary power consumption.
2Use of energy by moving object
If the relay automatically switches to blocked state after predetermined time, then unnecessary power consumption is prevented, but data collection timing must be precisely controlled
Solution Approach 1:
The relay acts as an intermediary component between the main power supply and the data collector. It mediates the power supply transition by automatically maintaining current flow for a predetermined period after the main power supply is stopped, then switching to the blocked state. This intermediary function ensures both continuous data collection and automatic power cutoff without requiring precise manual timing control.
Data Source
AI summary
An electric work vehicle includes a first power storage, a second power storage, a motor to drive at least either a travel device or a work device, a data collector to acquire data including information on driving of the motor over time, and a relay connected to both the second power storage and the data collector, and switchable between a current-flow state where a current is allowed to flow between the second power storage and the data collector and a blocked state where a current flowing between the second power storage and the data collector is blocked. The relay switches from the current-flow state to the blocked state in response to an elapse of a preset first time from a timing at which a turn-off operation is performed on a switch operation tool.