Apparatus for calculating quantity indicating charged state of on-vehicle battery
First Claim
1. An apparatus for calculating a quantity indicating a charged state of a battery being mounted on a vehicle, the battery powering a starter starting up an engine mounted on the vehicle, the apparatus comprising:
- a data acquiring unit configured to acquire a plurality of pairs of data consisting of current and voltage of the battery at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter;
a first calculating unit configured to calculate, as the quantity, at intervals, a value of an internal resistance of the battery based on the plurality of pairs of data of current and voltage;
a second calculating unit configured to calculate an open voltage difference which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period; and
a correcting unit configured to correct the value of the internal resistance by using the open voltage difference, the corrected value of the internal resistance being indicative of the charged state of the battery.
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Abstract
An apparatus is provided to calculate a quantity indicating a charged state of an on-vehicle battery. The battery powers a starter starting up an on-vehicle engine. In the apparatus, a plurality of pairs of data consisting of current and voltage of the battery are acquired at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter. At intervals, a value of an internal resistance of the battery is calculated based on the plurality of pairs of data of current and voltage. The internal resistance is one kind of the charged-state indicating quantity. An open voltage difference is calculated, which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period. The value of the internal resistance is corrected using the open voltage difference.
27 Citations
15 Claims
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1. An apparatus for calculating a quantity indicating a charged state of a battery being mounted on a vehicle, the battery powering a starter starting up an engine mounted on the vehicle, the apparatus comprising:
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a data acquiring unit configured to acquire a plurality of pairs of data consisting of current and voltage of the battery at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter;
a first calculating unit configured to calculate, as the quantity, at intervals, a value of an internal resistance of the battery based on the plurality of pairs of data of current and voltage;
a second calculating unit configured to calculate an open voltage difference which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period; and
a correcting unit configured to correct the value of the internal resistance by using the open voltage difference, the corrected value of the internal resistance being indicative of the charged state of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for calculating a quantity indicating a charged state of a battery being mounted on a vehicle, the battery powering a starter starting up an engine mounted on the vehicle, the apparatus comprising:
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acquiring means for accruing a plurality of pairs of data consisting of current and voltage of the battery at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter;
first calculating means for calculating, as the quantity, at intervals, a value of an internal resistance of the battery based on the plurality of pairs of sampled data of current and voltage;
second calculating means for calculating an open voltage difference which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period; and
correcting means for correcting the value of the internal resistance by using the open voltage difference, the corrected value of the internal resistance being indicative of the charged state of the battery. - View Dependent Claims (14)
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15. A method of calculating a quantity indicating a charged state of a battery being mounted on a vehicle, the battery powering a starter starting up an engine mounted on the vehicle, the method comprising steps of:
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accruing a plurality of pairs of data consisting of current and voltage of the battery at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter;
calculating, as the quantity, at intervals, a value of an internal resistance of the battery based on the plurality of pairs of sampled data of current and voltage;
calculating an open voltage difference which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period; and
correcting the value of the internal resistance by using the open voltage difference, the corrected value of the internal resistance being indicative of the charged state of the battery.
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Specification