Functionality and Configuration Parameters of the Diagnostic Event Manager - AutoSAR in Practice
Introduction:
In modern automotive electronic systems, vehicle networking and communication are becoming increasingly complex. To ensure vehicle stability and safety, automakers are constantly striving to improve the reliability and functionality of vehicle electronic control units (ECUs). AutoSAR (AUTomotive Open System ARchitecture) is an industry standard born to solve this problem. AutoSAR defines a series of specifications and interfaces, making vehicle software development, integration and configuration more convenient and reliable. This article will focus on an important component in AutoSAR—the diagnostic event manager, including its functions and configuration parameters, and illustrate its working principle by providing relevant source codes.
First, the function of the diagnostic event manager
The Diagnostic Event Manager (DEM) is a key component in the AutoSAR architecture, which is responsible for processing and managing the diagnostic events generated by each ECU of the vehicle. Diagnostic events refer to errors, faults and abnormal conditions detected by the ECU during operation. The main functions of DEM are as follows:
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Diagnostic event record: DEM can record and store diagnostic event information generated by all ECUs, including event type, priority and detailed description, etc. These records are very important for troubleshooting and vehicle maintenance.
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Event priority management: DEM can perform priority management on diagnostic events according to the severity and urgency of the event. In this way, when multiple events occur at the same time, the DEM can determine the priority event according to the predefined rules.
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Diagnostic event notification: DEM can notify other ECUs or diagnostic tools on the vehicle of relevant information about diagnostic events. In this way, other systems can learn about the event in time and make corresponding response and processing.
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Event status management: DEM can track and manage the status of diagnostic events, including event triggering, confirmation, recovery, and termination. These status information can help vehicle maintenance personnel to better understand and analyze the occurrence and evolution of events.
Second, the configuration parameters of the diagnostic event manager