Vehicle Battery Diagnostics With Adaptive Discharge Timing
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Solution Overview
Problem
The diagnostic accuracy of batteries mounted on vehicles is compromised when a current larger than the diagnostic discharge current is requested, leading to unstable diagnostic discharge values.
Innovation Solution
A battery diagnostic device that performs multiple diagnostic discharge processes to acquire highly accurate physical quantities, including a first diagnostic discharge, a second discharge when initial diagnosis is not possible, and a third discharge after a waiting period to stabilize the battery state, ensuring accurate deterioration diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a current larger than the diagnostic discharge current is requested from the in-vehicle device during diagnostic discharge, then the in-vehicle device can operate normally, but the diagnostic discharge current becomes unstable and diagnostic accuracy is lowered
Solution Approach 1:
The system performs a determination process before the diagnostic discharge to predict whether a large current will be requested by the in-vehicle device. Based on this preliminary assessment, it decides whether to proceed with the diagnostic discharge or postpone it to a later timing when the device is not operating, thereby preventing current instability during diagnosis
Solution Approach 2:
The system dynamically adjusts the diagnostic discharge timing based on the operational state of the in-vehicle device. It flexibly determines the optimal discharge timing by considering real-time device operation status, ensuring that diagnostic discharge is performed only when it will not interfere with device operation or compromise measurement accuracy
2Measurement precision
If diagnostic discharge is performed repeatedly to acquire accurate physical quantities, then diagnostic accuracy improves, but stored electricity in the battery is excessively reduced
Solution Approach 1:
The system changes the discharge current parameter dynamically during the diagnostic process. It performs determination processes that assess whether continuing with the current discharge level is appropriate, and adjusts the discharge current accordingly to balance the need for accurate measurements with the need to preserve battery charge
Solution Approach 2:
The system implements a feedback mechanism where the determination unit continuously monitors the battery state and physical quantity acquisition progress. Based on this feedback, it decides whether to continue, modify, or terminate the diagnostic discharge process, thereby optimizing the balance between diagnostic accuracy and charge consumption
Data Source
AI summary
A battery diagnostic device includes a first discharge process unit that performs a first diagnostic discharge, a first determination unit that determines whether a deterioration diagnosis of the battery is possible based on a physical quantity indicating the state of the battery during the first diagnostic discharge acquired by a first acquisition unit, a second discharge process unit that performs a second diagnostic discharge when it is determined that the deterioration diagnosis of the battery is impossible, and a diagnosis unit that performs the deterioration diagnosis of the battery based on the physical quantity acquired by the first acquisition unit when it is determined that the deterioration diagnosis of the battery is possible, and performs the deterioration diagnosis of the battery based on a physical quantity indicating the state of the battery during the second diagnostic discharge when it is determined that the deterioration diagnosis of the battery is impossible.