Vehicle Data Recorder Shutdown Timing Control
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Solution Overview
Problem
Existing data recording apparatuses face challenges in achieving compatibility between reliable data recording and reduced power consumption in vehicle control units, as they often switch to sleep mode at different times than the controller, leading to unnecessary power consumption or missed data recording.
Innovation Solution
A data recording apparatus with a determination section to assess the operation status of the control unit and a control section that executes shut-down processing at the appropriate time, using switchable shut-down modes based on the type of control parameter and acquisition conditions to synchronize with the control unit's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the data recording apparatus switches to sleep mode after a predetermined time after ignition switch is turned off, then power consumption is reduced, but data recording reliability deteriorates because the apparatus may terminate recording before the controller finishes operating
Solution Approach 1:
The determination section continuously monitors whether the control unit has terminated its operation by detecting the absence of data responses to data request signals. This feedback mechanism allows the control section to accurately determine when the controller has finished operating and adjust the shut-down timing accordingly, ensuring complete data recording while minimizing power consumption.
Solution Approach 2:
The patent implements dynamic shut-down timing based on the actual operation state of the control unit. Instead of using a fixed predetermined time, the system adapts its shut-down decision based on real-time detection of the control unit's termination status, allowing flexible adjustment between power saving and data recording completeness.
2Reliability
If the data recording apparatus continues operating after the control unit terminates operation, then data recording completeness is improved, but power consumption increases unnecessarily
Solution Approach 1:
The determination section performs preliminary detection of the control unit's termination status before the control section executes shut-down processing. By detecting whether the control unit has stopped responding to data requests, the system can preliminarily determine the appropriate shut-down timing, ensuring complete data recording while avoiding unnecessary power consumption.
Solution Approach 2:
The system uses feedback from the data request signal responses to dynamically determine when to shut down. The determination section continuously monitors the control unit's response status and provides feedback to the control section, enabling precise timing of the shut-down action to balance data completeness and power savings.
Data Source
AI summary
In a data recording apparatus for recording control parameters in a control unit in a vehicle, it is determined whether or not the control unit has terminated an operation for outputting control parameters to be recorded. Then, when it is determined that the control unit has terminated the operation, shut-down processing is executed at a timing at which the termination of the operation is determined for shutting down a power supply to the data recording apparatus.