APPARATUS FOR ESTIMATING CHARGED STATE OF ON-VEHICLE BATTERY
First Claim
1. An apparatus for estimating a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter, comprisingdetection means for detecting a voltage of the battery and a discharge current from the battery for a period of time ranging time instants before and after starting the engine;
- acquisition means for acquiring information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine.
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Abstract
An apparatus is provided to estimate a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter. The apparatus comprises a detection device and an acquisition device. The detection device detects a voltage of the battery and a discharge current from the battery for a period of time over time instants before and after starting the engine. The acquisition device acquires information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine.
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Citations
20 Claims
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1. An apparatus for estimating a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter, comprising
detection means for detecting a voltage of the battery and a discharge current from the battery for a period of time ranging time instants before and after starting the engine; acquisition means for acquiring information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An automatic stop and start control apparatus, comprising
an apparatus for estimating a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter, the estimating apparatus comprising detection means for detecting a voltage of the battery and a discharge current from the battery for a period of time over time instants before and after starting the engine; -
acquisition means for acquiring information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine, wherein the acquisition means comprises discharge current estimating means for estimating a difference between the amount of the discharge current before starting the engine and the amount of the discharge current when the detected voltage becomes the minimum due to starting the engine, based on the detected voltage and current, the difference being estimated as a maximum discharge current amount of the battery necessary for starting the engine; and prediction means for predicting a minimum value of the voltage of the battery which is to be caused when the starter is activated for starting the engine at present, on the basis of the estimated maximum discharge current amount and the detected voltage of the battery; and means for performing at least one of an automatic stop process and an automatic start process based on the minimum value of the voltage of the battery predicted by the prediction means. - View Dependent Claims (18)
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19. An apparatus for estimating a charged state of a vehicle provided with an internal combustion engine having a crankshaft, a starter that initially rotates the crankshaft when the engine is started, and a battery that powers the starter, comprising
a detection unit that detects a voltage of the battery and a discharge current from the battery for a period of time over time instants before and after starting the engine; an acquisition unit that acquires information indicative of an amount of the discharge current from the battery when the detected voltage of the battery becomes a minimum due to starting the engine. - View Dependent Claims (20)
Specification