Battery Control Device Current Measuring System Abnormality Detection
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Solution Overview
Problem
Conventional battery control devices with self-diagnostic functions cannot distinguish between abnormalities in the voltage measuring system and the current measuring system, leading to complex processing and limited diagnostic timing capabilities.
Innovation Solution
A battery control device with a controller that determines abnormalities in the current measuring system by analyzing vehicle operation state information, such as ignition status and engine speed, during idle stop states when the discharge current is equal to or below a prescribed value, allowing for independent detection from the voltage system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional self-diagnostic processing is used to detect abnormalities in the battery system, then abnormality detection capability is provided, but the processing becomes complex and the number of diagnostic timing opportunities is limited
Solution Approach 1:
The patent divides the self-diagnostic function into separate processing paths: one for detecting abnormalities in the voltage measuring system and another for detecting abnormalities in the current measuring system. This segmentation allows each diagnostic path to be handled independently, reducing overall processing complexity while maintaining comprehensive abnormality detection capability.
2Reliability
If conventional self-diagnostic processing is used to detect abnormalities, then abnormality detection is performed, but the processing complexity increases and diagnostic timing is limited
Solution Approach 1:
The patent performs preliminary checks by evaluating vehicle operation state information and engine operation information before executing the main self-diagnostic processing. This allows the system to determine appropriate diagnostic timing in advance, increasing the number of diagnostic opportunities without adding complexity to the core detection algorithms.
3Reliability
If conventional self-diagnostic processing is used, then abnormality detection is provided, but it cannot distinguish between voltage system and current system abnormalities
Solution Approach 1:
The patent implements separate diagnostic processing paths that specifically identify whether an abnormality originates from the voltage measuring system or the current measuring system. By segmenting the detection logic, the system achieves precise identification of the abnormality source, enabling targeted troubleshooting and maintenance.
Data Source
AI summary
In a self-diagnostic processing performed by a CPU, whether a vehicle is in an idle stop state is determined based on obtained vehicle operation information and engine operation information in order to perform abnormality detection processing. When an engine has stopped in a vehicle equipped with an idle stop function, electric power is supplied to electrical components of the vehicle, which means a battery supplies currents to the electrical components. Consequently, if a current measurement result obtained by measuring a current while the vehicle is stationary and an ignition is ON indicates that the measurement value is equal to or below a prescribed current value, the CPU determines that an abnormality has occurred in a measuring system.