METHOD FOR DIAGNOSING THE LEAD-ACID BATTERY OF AN AUTOMOBILE AND SYSTEM FOR IMPLEMENTING THE SAME
First Claim
1. Diagnosis method for a lead-acid battery (2) of an automotive vehicle, characterized in that it comprises the following steps:
- during an experimentation phase, of conducting parameterization of the state of health (SOH) of a lead-acid battery for different values of the state of charge (SOC) of the battery, for each of the state of charge values there are values representing the state of health of the battery for pairs of values including battery temperature (T) and at least one battery parameter (γ
) which is determined from battery voltage (U) and current (I), the temperature (T), current (I) and voltage (U) being measured during the vehicle start-up phase over a given range of current variation and after the first discharge,during a diagnosis phase of the battery equipping the vehicle;
during the start-up phase of the vehicle, of measuring the temperature of the battery and, after the first discharge and over a given range of current variation, of measuring the corresponding voltage (U) and current (I) so as to deduce, after processing, a parameter value (γ
) of the battery,of determining the state of charge (SOC) of the battery,and of determining the value representing the state of health of the battery using the parameterization and the pair of values of measured temperature and parameter (γ
) deduced from measurements, for the state of charge (SOC), so as to establish a diagnosis of the battery.
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Abstract
A method for diagnosing a lead-acid battery of an automotive vehicle includes an experimentation phase in which parameterization of the state of health (SOH) of a lead-acid battery for different values of the state of charge (SOC) of the battery is conducted, and a diagnosis phase in which the battery temperature during the start-up phase of the vehicle is measured and, after the first discharge and over a given range of current variation, the corresponding voltage (U) and current (I) is measured, to deduce therefrom after processing, a value of parameter (γ) of the battery. The state of charge (SOC) of the battery is then determined, and the value representing the state of health is determined, so as to establish a diagnosis of the battery.
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Citations
20 Claims
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1. Diagnosis method for a lead-acid battery (2) of an automotive vehicle, characterized in that it comprises the following steps:
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during an experimentation phase, of conducting parameterization of the state of health (SOH) of a lead-acid battery for different values of the state of charge (SOC) of the battery, for each of the state of charge values there are values representing the state of health of the battery for pairs of values including battery temperature (T) and at least one battery parameter (γ
) which is determined from battery voltage (U) and current (I), the temperature (T), current (I) and voltage (U) being measured during the vehicle start-up phase over a given range of current variation and after the first discharge,during a diagnosis phase of the battery equipping the vehicle; during the start-up phase of the vehicle, of measuring the temperature of the battery and, after the first discharge and over a given range of current variation, of measuring the corresponding voltage (U) and current (I) so as to deduce, after processing, a parameter value (γ
) of the battery,of determining the state of charge (SOC) of the battery, and of determining the value representing the state of health of the battery using the parameterization and the pair of values of measured temperature and parameter (γ
) deduced from measurements, for the state of charge (SOC), so as to establish a diagnosis of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. System to establish the diagnosis of a lead-acid battery of an automotive motor vehicle, characterized in that in a casing equipped with assembly means it comprises:
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a sensor (10) to measure the current (I) delivered by the battery (2) a sensor (12) to measure the voltage (U) of the battery (2), a sensor (14) to measure the temperature (T) of the battery (2) an acquisition and processing unit (15) linked to the measuring sensors and comprising; means to memorize parameterization of the state of health (SOH) of a lead-acid battery for different values of battery state of charge (SOC), for each of the state of charge values there are values representing the state of health of the battery for pairs of values including battery temperature (T) and a battery parameter (γ
) which is determined on the basis of measurements of voltage and current taken over a given range of current variation, after the first discharge and during the start-up phase of the vehicle,means to determine the state of charge of the battery, means to determine the value representing the state of health of the battery using the parameterization and the pair of values of measured temperature and the parameter (γ
) deduced from measurements and for the determined state of charge (SOC),and means to provide information on the value representing the state of health of the battery. - View Dependent Claims (18, 19, 20)
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Specification