Engine Restart Determination via Internal Resistance Calculation

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Solution Overview

Problem

Existing methods for determining the restartability of an engine during idling stop in lead-acid batteries fail to accurately detect internal short-circuits due to the non-linear relationship between internal resistance values during charging and discharging, making it difficult to assess whether a restart is possible.

Innovation Solution

A restart determination device that calculates the internal resistance value of the energy storage device during idling stop using acquired voltage and current values, along with a no-load voltage value, and determines restart feasibility based on this calculation and the starter motor's operating voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the internal state determination method of Patent Document 1 is applied to lead-acid batteries, then the method can be used for battery monitoring, but the detection accuracy of internal short-circuits deteriorates due to the non-linear relationship between internal resistance values during charging and discharging

Engineering Contradiction:

Improveapplicability of determination methodVSAvoidinternal short-circuit detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent changes the parameter used for determination from internal resistance (which has non-linear relationship during charging/discharging in lead-acid batteries) to terminal voltage during idling stop. This parameter change resolves the contradiction by selecting a measurement parameter that maintains linear and predictable relationship with battery state, thereby achieving both broad applicability and high detection accuracy for internal short-circuits in lead-acid batteries.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If existing determination methods are used during idling stop, then the process is simple, but the ability to accurately detect internal short-circuits and prevent restart failures deteriorates

Engineering Contradiction:

Improvedetermination process complexityVSAvoidrestart determination reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent performs preliminary determination of restart capability during the idling stop period before the actual restart occurs. By measuring terminal voltage during idling stop and comparing it with predetermined thresholds, the system identifies internal short-circuits in advance, allowing reliable restart determination without adding complex hardware or procedures.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If internal resistance is measured during charging to determine battery state, then the measurement can be performed during normal operation, but the measurement accuracy for lead-acid batteries on the high SOC side deteriorates due to non-linear characteristics

Engineering Contradiction:

Improvemeasurement timing flexibilityVSAvoidinternal resistance measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent extracts the determination measurement from the charging/discharging process (where non-linear effects occur) and performs it specifically during the idling stop condition. By separating the measurement timing from normal charge/discharge operations, the method achieves accurate internal short-circuit detection for lead-acid batteries on the high SOC side while maintaining operational flexibility.

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Accurately detects internal short-circuits and determines whether an engine restart is possible, preventing restart failures by calculating internal resistance values effectively, even when batteries are on the high SOC side.

Implementation Method 1

an internal resistance value calculation unit that calculates an internal resistance value of the energy storage device during the idling stop, based on the first voltage value, the current value, and a no-load voltage value

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Data Source

PatentEP3683913B1Restart determination device, internal-short determination device, restart determination method, and computer program

Publication Date: 2023.02.22 GS YUASA INT LTD

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AI summary

A restart determination device 4 includes a voltage value acquisition unit 44 that acquires a first voltage value between terminals of an energy storage device during an idling stop for stopping idling of an engine, a current value acquisition unit 45 that acquires a value of a current flowing through the energy storage device during the idling stop, a calculation unit 49 that calculates an internal resistance value of the energy storage device during the idling stop, based on the first voltage value, the current value, and a no-load voltage value, and a determination unit 51 that determines whether or not a restart of the engine is possible based on the internal resistance value and an operating voltage value of a starter motor of the engine.