Method for determining the starting ability of a starter battery in a motor vehicle
First Claim
1. A method for determining the starting ability of a starter battery in a motor vehicle comprising:
- measuring current and voltage of the storage battery before starting is begun;
measuring current and voltage of the storage battery shortly after starting is begun;
measuring current and voltage of the storage battery at predetermined intervals of time during starting;
calculating a resistance value and the quantity of charge drawn from the storage battery from current/voltage value pairs for each measurement; and
determining a measure of availability of the storage battery during starting, based on the rate of rise in the resistance values, as a function of the quantity of charge drawn.
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Accused Products
Abstract
A method for determining the starting ability of the starter battery in a motor vehicle. The current and voltage of the storage battery are measured before starting is begun, shortly after starting is begun and at short intervals of time during the starting procedure. The current/voltage value pairs for each instant are used to calculate a resistance value and the quantity of charge drawn from the storage battery, and the rate of rise in the resistance values as a function of the quantity of charge drawn is used to derive a measure of the availability of the storage battery during the starting procedure. In particular, the gradient ΔRQ of the internal resistance as a function of the quantity of charge drawn and the turn-on internal resistance RE are stored in an arithmetical memory as a field as a function of the charge state or of the equivalent no-load voltage (UR) and the battery temperature and are compared with already recorded values or typical normal values.
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Citations
9 Claims
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1. A method for determining the starting ability of a starter battery in a motor vehicle comprising:
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measuring current and voltage of the storage battery before starting is begun;
measuring current and voltage of the storage battery shortly after starting is begun;
measuring current and voltage of the storage battery at predetermined intervals of time during starting;
calculating a resistance value and the quantity of charge drawn from the storage battery from current/voltage value pairs for each measurement; and
determining a measure of availability of the storage battery during starting, based on the rate of rise in the resistance values, as a function of the quantity of charge drawn. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the starting ability of a starter battery in a motor vehicle comprising:
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measuring current and voltage of the storage battery before starting is begun;
measuring current and voltage of the storage battery shortly after starting is begun;
measuring current and voltage of the storage battery at predetermined intervals of time during starting;
calculating a resistance value and the quantity of charge drawn from the storage battery from current/voltage value pairs for each measurement;
measuring a voltage and current pair (US,IS) in a time range in which turn-on resistance RE and resistance RS=Δ
US/Δ
IS are substantially the same, and determining RS as the gradient of a current/voltage line at two respective instants which are separated by a relatively long measurement period to determine an equivalent no-load voltage UR for determining the charge state of the storage battery;
storing a gradient Δ
RQ of internal resistance as a function of quantity of charge drawn and turn-on resistance RE in an arithmetical memory and comparing the gradient with already recorded values or preselected normal values;
determining a measure of availability of the storage battery during starting, based on the rate of rise in the resistance values as a function of the quantity of charge drawn.
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Specification