Dark Current Cutoff Device with Recording Prohibition Logic
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Solution Overview
Problem
Conventional dark current cutoff methods require operation to delete failure information, which is inconvenient, and may not effectively cut off dark current due to the need for maintaining electrical connections for failure recording loads during vehicle transportation and storage.
Innovation Solution
A dark current cutoff device and method that utilize a recording prohibiting unit to prevent failure recording when the cutoff switch is opened, allowing power to be supplied via an alternative route, thus avoiding the need for deletion operations and enhancing cutoff effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the short-circuit pin is pulled out to cut off dark current, then the cutoff effect for dark current is improved, but the load performs undesired failure recording processing
Solution Approach 1:
The control unit acts as an intermediary between the open/close unit and the failure recording unit. It monitors the state of the open/close unit and selectively controls the failure recording unit to prevent undesired failure recording when the open/close unit is opened, while still allowing failure recording when the open/close unit is closed and power is normally supplied.
Solution Approach 2:
The control unit receives feedback about the state of the open/close unit and adjusts the operation of the failure recording unit accordingly. When the open/close unit is detected to be in the opened state, the control unit prohibits the failure recording unit from recording failures, thereby preventing undesired failure information generation.
2Loss of information
If the short-circuit pin is not pulled out to avoid failure recording, then the failure recording processing is prevented, but the dark current cannot be cut off
Solution Approach 1:
The control unit serves as an intermediary that enables selective control of the failure recording unit based on the state of the open/close unit, allowing the system to achieve both dark current cutoff and prevention of undesired failure recording through centralized control logic.
Solution Approach 2:
The system changes the operational parameter of the failure recording unit based on the state of the open/close unit. When the open/close unit is opened, the control parameter for the failure recording unit is changed to prohibit recording, thereby preventing undesired failure information while maintaining the dark current cutoff effect.
3Loss of energy
If power is cut off to the load during transportation, then the dark current is reduced, but the load cannot distinguish between intentional cutoff and actual failure
Solution Approach 1:
The control unit provides feedback control by monitoring the open/close unit state and dynamically adjusting the failure recording unit's operation. This feedback mechanism enables the system to distinguish between intentional power cutoff (when open/close unit is opened) and actual load failures, maintaining reliable failure detection accuracy while reducing dark current.
Data Source
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AI summary
A dark current cutoff device (1) includes: a battery (10) configure to perform electrical power supply to a load (20); a cutoff switch (32), which is provided between the battery (10) and the load (20), cuts off the electrical power supply to the load (20) at a time of being opened, and supplies electrical power to the load (20) at a time of being closed; a failure recording unit (21) that determines and records a case where the load (20) does not operate as a failure of the load (20); and an open/close determining unit (41) that determines that the cutoff switch (32) is opened; and a recording prohibiting unit (22) configure to prohibit, in a case where the cutoff switch (32) is determined to be opened by the open/close determining unit (41), the failure recording unit (21) from determining and recording the failure.