CAN Burst Analysis for Signal Delay Measurement
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Solution Overview
Problem
Current methods for analyzing signal delay time in CAN communication systems are inadequate, as they require software changes or simulations, which are costly and unreliable, and fail to accurately assess delay times due to limited resource constraints and difficulty in replicating actual vehicle environments.
Innovation Solution
A method and apparatus for analyzing signal delay time through CAN burst analysis, which determines transmission start times, receiving intervals, and maximum transmission delays without altering controller software, using measured signal information to select and analyze target CAN signals within fixed burst periods, and calculates average transmission periods using the least squares method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If software changes or simulations are made to measure delay time, then delay time measurement capability is improved, but disposition costs and time increase, and reliability is degraded
Solution Approach 1:
An external delay time measurement device is introduced as an intermediary between the CAN bus and the analysis system. This device captures CAN signals without requiring any modification to the controller software, thereby maintaining controller reliability while enabling accurate delay time measurements through external observation and calculation
2Measurement precision
If software changes are made to measure delay time, then delay time measurement capability is improved, but disposition costs and time increase
Solution Approach 1:
The measurement function is moved to an external device that can be added without modifying existing controller software. This intermediary approach avoids the costly and time-consuming process of software changes while maintaining measurement capability
Solution Approach 2:
Instead of modifying the original controller software, the invention creates an external measurement system that copies and analyzes CAN signals. This external copy performs the measurement function without affecting the original system, reducing implementation costs
3Measurement precision
If simulation of internal software structure is used, then delay time analysis is possible, but it is difficult to perfectly embody actual vehicle environment and prove correspondence
Solution Approach 1:
An external measurement device serves as an intermediary that directly observes actual CAN signals in the real vehicle environment. This eliminates the need for simulations and directly captures real-world data, ensuring accurate representation of the actual vehicle environment
Solution Approach 2:
The invention replaces the virtual simulation approach with a physical measurement system that directly interfaces with the CAN bus. This substitution of mechanical measurement for virtual simulation provides direct empirical data from the actual vehicle environment, proving correspondence without requiring simulation validation
Data Source
AI summary
A method and apparatus for analyzing a signal delay time based on controller area network (CAN) burst are disclosed. An apparatus for analyzing a signal delay time, connected to a controller area network (CAN) bus includes a measuring device configured to determine a transmission start time based on a receiving time point of a CAN signal and to determine a receiving time interval between the CAN signals that are continuously received, a fixer configured to fix a burst period corresponding to CAN signals with the determined receiving time interval less than a predetermined value, a selector configured to select an analysis target CAN signal in the fixed burst period, and a determiner configured to determine a maximum transmission delay time ‘a’ corresponding to the selected CAN signal.