Method for determining the charge state of a motor vehicle battery when the drive unit is switched off
First Claim
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1. A method for determining the charge state of a motor vehicle battery, comprising:
- detecting an electrical voltage of the motor vehicle battery using a sensor external to the motor vehicle battery for detecting the temperature of the motor vehicle battery at time intervals while a drive unit of the motor vehicle is switched off, and determining the charge state of the battery on the basis of the detected voltage of the motor vehicle battery and on the basis of the detected temperature of the motor vehicle battery.
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Abstract
A method is provided for determining the charge state of a motor vehicle battery. An electrical voltage of the motor vehicle battery is detected and the electrical charge state of the motor vehicle battery is determined on the basis of the detected voltage of the motor vehicle battery. According to the method, the temperature of the motor vehicle battery is detected using a sensor that is separated spatially from the motor vehicle battery, and the charge state of the battery is determined on the basis of the detected voltage of the motor vehicle battery and on the basis of the detected temperature of the motor vehicle battery.
6 Citations
18 Claims
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1. A method for determining the charge state of a motor vehicle battery, comprising:
- detecting an electrical voltage of the motor vehicle battery using a sensor external to the motor vehicle battery for detecting the temperature of the motor vehicle battery at time intervals while a drive unit of the motor vehicle is switched off, and determining the charge state of the battery on the basis of the detected voltage of the motor vehicle battery and on the basis of the detected temperature of the motor vehicle battery.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining a charge state of a motor vehicle battery, comprising:
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detecting voltage of the motor vehicle battery; using a sensor that is separated spatially from the motor vehicle battery to make a plurality of successive temperature measurements to obtain a plurality of successive detected temperature values; determining whether the detected temperature values differ from one another within a permissible tolerance band; determining a temperature value measured by the sensor as a temperature of the motor vehicle battery when the detected temperature values differ from one another within the permissible tolerance band; and determining the charge state of the battery based on the detected voltage of the motor vehicle battery and on the detected temperature of the motor vehicle battery. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A motor vehicle, comprising:
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a drive unit configured to be switched off selectively; a chargeable battery; a voltage detector for detecting a voltage of the battery, the voltage detector being independent of an electrical main supply; a temperature sensor spatially separated from the battery and being independent of the electrical main supply; and a battery charging device connected to the battery and being independent of the electrical main supply, the battery charging device being configured for charging the battery when a charged state of the battery drops below a predetermined limiting value as determined by the voltage of the battery detected by the voltage detector and the temperature sensed by the temperature sensor and when the drive unit of the motor vehicle is switched off.
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Specification