Vehicle Battery State Check Using 48 V Load Resistance Measurement
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Solution Overview
Problem
Existing methods for determining the state of a vehicle battery require additional components that add weight and bulk to the motor vehicle, necessitating a simpler and more efficient method that utilizes existing vehicle elements.
Innovation Solution
A method that assesses battery health by analyzing internal resistance and voltage drop during a current draw using 48V loads, such as the alternator-starter or electric machine, without requiring additional installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional measuring sensors or electrical loads are installed to determine battery state, then measurement capability is improved, but vehicle weight and bulk increase
Solution Approach 1:
The patent applies multi-functionality by using existing vehicle components (alternator, starter motor, existing current sensors) for dual purposes: their primary functions remain unchanged while they simultaneously serve battery state measurement. The alternator provides both power generation and measurement current, the starter motor provides both starting function and measurement load, and existing current sensors provide both vehicle operation monitoring and battery internal resistance calculation
Solution Approach 2:
The system uses the vehicle's own existing components to perform the measurement function without external additions. The battery state determination is achieved through self-service by utilizing the alternator's output current, the starter motor's current draw, and existing sensor data already present in the vehicle's electrical system
2Measurement precision
If additional measuring sensors or electrical loads are installed to determine battery state, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by using existing vehicle components (alternator, starter motor, existing current sensors) for dual purposes: their primary functions remain unchanged while they simultaneously serve battery state measurement. The alternator provides both power generation and measurement current, the starter motor provides both starting function and measurement load, and existing current sensors provide both vehicle operation monitoring and battery internal resistance calculation
Solution Approach 2:
The patent extracts the measurement function from separate dedicated components and integrates it into the existing vehicle systems. Instead of adding independent measurement devices, the measurement capability is extracted and embedded within the alternator control, starter motor control, and existing sensor data processing
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
Enables quick and lightweight determination of battery state without adding bulk to the vehicle, ensuring reliable assessment of battery health for safety-critical components.
Implementation Method 1
determining the state of a first battery (31) equipping a motor vehicle (1) comprises: configuring a second converter (18) in reversible mode and activating a 48 V load (11, 13, 32); applying a 48 V voltage to the first battery (31) from the 48 V load (11, 13, 32); measuring a battery voltage across terminals of the first battery (31) during a current draw in order to determine an internal resistance
Data Source
Figure 1~2
Figure 3
AI summary
Method for determining (100) a state (E) of a first battery fitted to a motor vehicle provided with an electric machine connected to a first converter. The determination method comprises: - a step (101) of configuring a second converter in reversibility mode and activating a 48 V load fitted to the motor vehicle, - a step (102) of applying a voltage of 48 V to the first battery from the 48 V load, - a step (103) of measuring a battery voltage (V) at the terminals of the first battery to deduce therefrom an internal resistance (R) of the first battery, - a step (104) of comparing the measured resistance (R) to a threshold resistance (R1), - a step (105) of displaying warning information (I) if the measured resistance (R) is greater than the threshold resistance (R1), - a step (106) of disconnecting the 48 V load and restoring normal starting if the measured resistance (R) is less than or equal to the threshold resistance (R1).