Lead-Acid Battery Type Identification by Charge Acceptance
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Solution Overview
Problem
Existing battery type identification methods for lead-acid batteries in vehicles with idling stop functions are inadequate, as they struggle to accurately differentiate between liquid-type and valve regulated lead-acid batteries, especially when the charge amount is small, leading to potential misclassification and improper vehicle control.
Innovation Solution
A battery type identifying device that determines the type of onboard lead-acid battery by executing a determination charging process after adjusting the battery state, using the acceptance amount and internal resistance to identify whether the battery is a liquid-type or valve regulated lead-acid battery, and further considers stratification effects and temperature corrections to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a small charge amount is used for battery identification, then the identification process is faster and consumes less energy, but the identification accuracy deteriorates due to insufficient charge-discharge cycles to detect battery characteristics
Solution Approach 1:
The patent changes the parameter of charge amount from small to large (full charge) to enable accurate detection of battery characteristics. By fully charging the battery and then discharging it to a specific state, the system can measure acceptance amount and internal resistance with sufficient precision to differentiate between liquid-type and valve regulated lead-acid batteries.
Solution Approach 2:
The patent applies preliminary action by fully charging the battery before performing the identification measurement. This preliminary charging process ensures the battery reaches a known initial state, allowing subsequent discharge and acceptance amount measurement to accurately reflect the battery's true characteristics without being influenced by prior charge levels.
2Measurement precision
If a large charge amount is used for battery identification, then the identification accuracy is improved by充分 detecting battery characteristics, but the energy consumption and charging time increase
Solution Approach 1:
The patent employs self-service by utilizing the vehicle's existing power generation system (engine and alternator) to perform the battery charging and identification process. The battery being identified serves its own identification purpose by providing electrical parameters during the charge-discharge cycle, eliminating the need for external testing equipment and reducing overall system energy consumption.
3Device complexity
If the battery is identified without considering stratification effects, then the identification process is simpler, but the accuracy deteriorates especially for liquid-type lead-acid batteries where stratification significantly affects charge acceptance
Solution Approach 1:
The patent introduces acceptance amount as an intermediary parameter that indirectly reflects stratification effects. Instead of directly measuring stratification (which would require complex sensors and processing), the system measures how much charge the battery accepts during a controlled discharge-recharge cycle. This acceptance amount serves as a mediator that captures the influence of stratification on battery performance, enabling accurate differentiation between battery types through relatively simple measurements.
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
The solution enables precise identification of lead-acid battery types, improving vehicle control by accurately determining battery suitability for idling stop functions, reducing misclassification, and accounting for stratification and temperature effects, thus enhancing battery management.
Implementation Method 1
a charge-discharge capacity of the lead-acid battery during the acquisition of the open-circuit voltage is acquired
Implementation Method 2
the internal resistance of the lead-acid battery is less than a determination resistance value
Data Source
AI summary
A battery type identifying device is capable of identifying the type of a vehicle-mounted lead storage battery. The battery type identifying device includes: a charge processing unit which, on the condition that the state of a lead storage battery has reached a prescribed state as a result of a reduction in the amount of electricity stored therein from a fully charged state, carries out a determination charging process of charging the lead storage battery for a prescribed time; an accepted amount acquiring unit which acquires an amount accepted by the lead storage battery in the period during which the determination charging process is being carried out; and a determining unit which determines whether the lead storage battery is a liquid-type lead storage battery on the basis of the accepted amount acquired by the accepted amount acquiring unit.