In-Vehicle Warning Light Control for Power-On Sensor Faults
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Solution Overview
Problem
In-vehicle control devices fail to immediately detect and alert drivers of sensor abnormalities when the sensor output signal is not initially available upon power-on, leading to situations where warning lights do not illuminate despite existing abnormalities.
Innovation Solution
A control device for in-vehicle units equipped with a control circuit and storage circuit that execute abnormality detection, write detection history, and output lighting requests, even when initial sensor output is absent, by retrieving and utilizing previous detection history upon power-on, and managing diagnostic information separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device waits for sensor output signal to be available before detecting abnormalities, then the abnormality detection process is simplified, but the warning light cannot light up immediately when an abnormality exists
Solution Approach 1:
The control device performs preliminary abnormality detection by checking whether the sensor output signal is present before attempting to detect abnormalities in the signal content. This preliminary action allows the system to immediately identify cases where no signal is received, triggering the warning light without waiting for further signal processing steps.
Solution Approach 2:
The control device introduces an intermediate detection step that checks for the presence of the sensor output signal itself as a proxy indicator. Instead of directly analyzing sensor data for abnormalities, the system uses the signal presence/absence status as an intermediary indicator to trigger warnings, bypassing the need for complex signal analysis when the signal is unavailable.
2Measurement precision
If the control device continuously monitors sensor output for abnormalities, then abnormality detection accuracy is improved, but the system complexity increases
Solution Approach 1:
The control device extracts and separates the abnormality detection function into a distinct, dedicated process module. By isolating the detection logic from other control functions, the system achieves high detection accuracy through specialized processing while keeping the overall device complexity manageable through functional separation.
Solution Approach 2:
The control device changes the monitoring parameter from continuous detailed signal analysis to periodic presence/absence checking. By switching between different detection modes (continuous monitoring vs. periodic checks), the system maintains high detection accuracy for critical failures while reducing computational complexity during normal operation.
Data Source
AI summary
A control device for an in-vehicle unit installed in a vehicle having a warning light includes a control circuit and a storage circuit. The control circuit executes an abnormality detection process, a detection result write-in process, and a lighting request output process. The storage circuit retains contents of the history information even when the in-vehicle unit is powered on or powered off. The control circuit is configured to retrieve the contents of the history information from the storage circuit when the in-vehicle unit is powered on. When the detection history is written in the retrieved contents, the control circuit outputs the lighting request even when an abnormality of the in-vehicle unit cannot be detected by the abnormality detection process.