Vehicle Charge Relay Diagnosis Controller
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Solution Overview
Problem
Current DC power feed facilities may erroneously diagnose charge relays as stuck due to the application of voltage during re-diagnosis processing, even if they are not actually stuck, leading to incorrect assessments.
Innovation Solution
The vehicle's controller performs re-diagnosis processing only when no start signal is received from the power feed facility, avoiding voltage application and ensuring accurate diagnosis by aborting re-diagnosis if a start signal is detected during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If re-diagnosis processing is performed after connector reconnection, then charge relay sticking can be diagnosed again, but voltage may be applied by the power feed facility causing erroneous diagnosis
Solution Approach 1:
The controller checks for the presence of a start signal from the power feed facility before initiating re-diagnosis processing. This preliminary check prevents the diagnosis from being performed when voltage would be applied, thereby avoiding erroneous detection results while still enabling diagnosis when safe to do so.
2Reliability
If the controller waits for user connection request for re-diagnosis, then diagnosis can be performed safely, but charging time is extended
Solution Approach 1:
The controller continuously monitors for the start signal from the power feed facility during and after the connector reconnection process. This feedback mechanism allows the controller to dynamically determine whether to proceed with re-diagnosis based on real-time voltage application status, optimizing both safety and charging efficiency.
Data Source
AI summary
An ECU of a vehicle performs diagnosis processing for diagnosing whether or not a charge relay has stuck after end of charging of a power storage. When the diagnosis processing has not normally ended, the ECU requests connection again of a connector to a charge port for performing re-diagnosis processing for diagnosing again whether or not the charge relay has stuck. When the connector and the charge port are connected to each other again, the ECU determines whether or not it has received a charging start signal from a DC power feed facility. When the ECU has received the charging start signal, it does not perform re-diagnosis processing.