ECU Wake-Up Timer Diagnostics for Battery Drain Reduction
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Solution Overview
Problem
Existing electronic control unit (ECU) systems face challenges in accurately and energy-efficiently diagnosing the wake-up feature, particularly during vehicle shutdown periods, leading to potential issues with diagnostic checks and battery drain.
Innovation Solution
The implementation of a wake-up timer and nonvolatile memory in an ECU to initiate and log wake-up events during shutdown, allowing for analysis and diagnosis during active operating states, ensuring accurate wake-up times and reducing battery drain through self-contained diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ECU performs diagnostic checks during vehicle shutdown periods using wake-up events, then the reliability of vehicle system monitoring is improved, but the energy consumption increases causing battery drain
Solution Approach 1:
The system implements periodic wake-up events where the ECU transitions from idle to active state at scheduled intervals during vehicle shutdown. The wake-up timer generates periodic interrupts that activate the ECU for brief diagnostic periods, then return it to idle state. This periodic operation enables necessary monitoring while limiting total energy consumption compared to continuous operation.
Solution Approach 2:
The ECU performs self-diagnosis of its wake-up functionality by monitoring its own wake-up events and logging results in non-volatile memory. The system automatically detects wake-up failures, logs diagnostic information including timestamps and event types, and reports status without requiring external diagnostic equipment. This self-service capability ensures monitoring reliability while maintaining energy efficiency.
2Measurement precision
If the ECU remains in active state to perform continuous monitoring, then the diagnostic precision is improved, but the energy consumption increases causing battery drain
Solution Approach 1:
The system performs diagnostic checks at periodic wake-up intervals rather than continuously. The wake-up timer triggers the ECU to enter active state for scheduled diagnostic periods, then returns to idle state. This periodic approach maintains diagnostic capability while dramatically reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The ECU performs preliminary diagnostic checks during wake-up events to detect potential issues before they become critical problems. By conducting routine monitoring at scheduled intervals, the system can identify anomalies early while maintaining energy efficiency, avoiding the need for continuous high-power diagnostic operations.
3Difficulty of detecting and measuring
If the ECU implements wake-up logging and analysis features, then the diagnostic capability is improved, but the device complexity increases
Solution Approach 1:
The wake-up logging and diagnostic analysis functions are merged into the existing ECU architecture, integrating with the wake-up timer, processor, and non-volatile memory rather than requiring separate dedicated components. This consolidation improves diagnostic capability while minimizing the increase in device complexity by utilizing existing system resources.
Solution Approach 2:
The ECU automatically logs wake-up event information to non-volatile memory and performs self-analysis of wake-up failures without requiring external diagnostic equipment. The system autonomously captures timestamps, event types, and status information, then analyzes logged data to detect wake-up failures and generate diagnostic reports, enhancing diagnostic capability while avoiding the complexity of external diagnostic systems.
Data Source
AI summary
A control and diagnosis methodology for an electronic module of a vehicle is presented here. In accordance with the disclosed method, at least one wake up event for a processor of the electronic module is performed during an inactive shutdown state of the vehicle. The at least one wake up event is initiated by a wake up timer of the electronic module. The method continues by logging, during the inactive shutdown state of the vehicle, wake up information associated with the at least one wake up event to obtain logged wake up information. The logged wake up information is analyzed during an active operating state of the vehicle to obtain a wake up diagnosis, and the method generates, during the active operating state of the vehicle, an output indicative of the wake up diagnosis.