Electric Work Vehicle Start Permission Display During Charging
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Solution Overview
Problem
Conventional electric work vehicles do not provide clear indication of whether it is appropriate to start the electric motor, leading to potential unsafe operation, especially during battery charging.
Innovation Solution
An electric work vehicle equipped with a start determination module in the drive controller, a display unit with start permission indicators, and a notification controller to inform the operator through visual and audio cues whether the electric motor can be started, considering charging states and system errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional electric work vehicles display basic battery information and operational status, then operators can monitor vehicle state, but operators cannot determine whether it is safe or appropriate to start the electric motor
Solution Approach 1:
The start determination module performs preliminary assessment of multiple vehicle states (battery temperature, charging status, motor temperature, circuit breaker status) before allowing motor startup. This preliminary action prevents unsafe operations by evaluating all necessary conditions in advance, providing start permission information before the operator attempts to start the motor.
Solution Approach 2:
The determination system is segmented into distinct functional modules: start determination module in the drive controller, notification controller, and display unit with start permission indicator. This segmentation allows each module to handle specific tasks (determination, notification, display) independently, making the overall system manageable despite its comprehensive nature.
2Reliability
If the vehicle provides comprehensive safety checks before motor startup, then operational safety is improved, but the system complexity and number of checks increase
Solution Approach 1:
The start determination module serves multiple functions simultaneously: it monitors battery temperature, checks charging status, tracks motor temperature, verifies circuit breaker status, and determines overall start permission. This multi-functionality consolidates multiple safety checks into a single universal module, improving reliability without proportionally increasing system complexity.
Solution Approach 2:
The system implements feedback through the notification controller and display unit, which continuously inform the operator of the start permission status based on real-time vehicle conditions. This feedback loop allows the system to maintain high safety standards by constantly monitoring and communicating the results of multiple checks, enabling operators to make informed decisions.
3Measurement precision
If the system monitors multiple parameters (battery temperature, charging status, motor temperature, circuit breaker status), then determination accuracy improves, but information processing complexity increases
Solution Approach 1:
The start determination module merges multiple parameter monitoring functions into a single integrated module. It combines battery temperature monitoring, charging status detection, motor temperature tracking, and circuit breaker status verification into one unified determination mechanism, achieving high measurement precision while consolidating control system complexity.
Data Source
AI summary
An electric work vehicle, which is configured to be driven with use of motive power of an electric motor configured to be supplied with electric power from a rechargeable battery, comprises: a drive controller configured to control driving of the electric work vehicle and including a start determination module configured to determine whether or not to permit the electric motor to be started; a display unit configured to display vehicle state information regarding the electric work vehicle and including a start permission indicator configured to indicate that the electric motor is permitted to be started; and a notification controller configured to control display in the display unit.