Vehicle starting battery cold-cranking AMPS meter and method
First Claim
1. A method of measuring cold-cranking amps of a vehicle starting battery having a rated cold-cranking amps, including:
- sourcing a current of known magnitude to or sinking a current of known magnitude from a vehicle starting battery at less than rated cold-cranking amps of the vehicle storage battery during at least one brief interval of time;
measuring terminal voltage of the vehicle starting battery during said sourcing or sinking and determining internal impedance of the vehicle starting battery from at least the measured terminal voltage;
measuring temperature of the vehicle starting battery; and
calculating cold-cranking amps from the determined internal impedance and measured temperature.
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Accused Products
Abstract
A vehicle starting battery cold-cranking amps meter and associated method includes providing a current source, a voltage meter, a current meter and a control. The current source produces a current pulse during a brief time interval at a known magnitude that is less than rated cold-cranking amps of the vehicle starting battery being tested. The volt meter measures battery terminal voltage of the vehicle storage battery being tested while the current source is sourcing current to or sinking current from the vehicle starting battery being tested. The control determines internal impedance of the vehicle starting battery being tested from the terminal voltage of the vehicle starting battery while the current source is sourcing current to or sinking current from the vehicle starting battery being tested and determines cold-cranking amps from the internal impedance and an output of the temperature meter.
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Citations
26 Claims
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1. A method of measuring cold-cranking amps of a vehicle starting battery having a rated cold-cranking amps, including:
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sourcing a current of known magnitude to or sinking a current of known magnitude from a vehicle starting battery at less than rated cold-cranking amps of the vehicle storage battery during at least one brief interval of time; measuring terminal voltage of the vehicle starting battery during said sourcing or sinking and determining internal impedance of the vehicle starting battery from at least the measured terminal voltage; measuring temperature of the vehicle starting battery; and calculating cold-cranking amps from the determined internal impedance and measured temperature. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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3. A vehicle starting battery cold-cranking amps meter comprising:
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a current source which produces a current pulse during a brief time interval at a known magnitude that is less than rated maximum cold-cranking amps of the vehicle starting battery being tested; a voltage meter which measures battery terminal voltage of the vehicle storage battery being tested while said current source is sourcing current to or sinking current from the vehicle starting battery being tested; a temperature meter measuring temperature of the vehicle storage battery being tested; and a control which determines internal impedance of the vehicle starting battery being tested from an output of said voltage meter while said current source is sourcing current to or sinking current from the vehicle starting battery being tested and determines cold-cranking amps from the internal impedance and an output of said temperature meter. - View Dependent Claims (4, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification