Vehicle Event Data Synchronization Using Shared Time Counting
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Solution Overview
Problem
Existing vehicle control systems require complex arithmetic processing to correct time discrepancies in event data, complicating the configuration and hindering accurate synchronization and analysis of event data during accidents.
Innovation Solution
A vehicle control apparatus with a detection unit and control unit that utilize separate clock units to count and synchronize times, allowing for simple time synchronization and accurate association of event data, thereby improving analysis accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If arithmetic processing is used to correct the time of collected event data, then time synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the time counting function into a single clock unit that is shared by both the detection unit and control unit. Instead of having separate clock units in each device that require complex arithmetic correction, both units use the same time base, automatically achieving time synchronization without additional correction processing.
Solution Approach 2:
The clock unit serves multiple functions: it provides time counting for event data collection in the detection unit, time counting for control data in the control unit, and serves as a universal time reference for synchronization across the entire system. This multi-functional design eliminates the need for separate clock units and complex synchronization algorithms.
2Adaptability or versatility
If separate clock units are used in detection unit and control unit, then operational independence is improved, but time synchronization accuracy deteriorates
Solution Approach 1:
The patent combines the time counting function of separate clock units into a single shared clock unit. This maintains operational independence of the detection and control units while ensuring they both use the same time reference, thereby achieving automatic time synchronization without requiring arithmetic correction.
3Measurement precision
If complex arithmetic processing is implemented for time correction, then time synchronization accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary action by establishing a single shared clock unit before any time synchronization issues can arise. This prevents the need for subsequent arithmetic correction processing, as time synchronization is inherently achieved through the shared time base from the outset.
Solution Approach 2:
By merging the time counting function into a single clock unit, the patent eliminates the need for complex arithmetic processing entirely. Both the detection unit and control unit automatically use the same time reference, achieving time synchronization without any correction calculations.
Data Source
AI summary
Vehicle control apparatus includes: detection unit including external sensor configured to detect external situation of vehicle; and control unit configured to control vehicle based on external situation detected by external sensor. Detection unit includes first processor and first memory. First processor counts first time, first time being elapsed time from predetermined time. First memory stores external situation and first time in association with each other. Control unit includes second processor and second memory. Second processor: calculates control value for controlling traveling actuator of vehicle based on external situation; and counts second time, second time being elapsed time from predetermined time. Second memory stores control value and second time in association with each other. Second processor transmits second time to detection unit at predetermined transmission cycle counted as second time. First processor replaces first time with second time transmitted from control unit and continues counting.