STORAGE BATTERY STATE DETECTION APPARATUS AND STORAGE BATTERY STATE DETECTION METHOD
First Claim
1. A storage battery state detection apparatus for estimating a starting minimum voltage of a storage battery before a starter is driven and providing the starting minimum voltage to a control device,the starting minimum voltage corresponding to a voltage value at which a battery voltage of the storage battery drops to a lowest level when the starter is driven,the control device being configured to determine, when determination is made as to whether or not to drive the starter in order to start an internal combustion engine, that the starter is to be driven when the starting minimum voltage of the storage battery is equal to or higher than a threshold value that does not influence the start of the internal combustion engine,the storage battery state detection apparatus comprising:
- an internal resistance calculation unit for calculating an internal resistance of the storage battery to be used as an index of a deterioration state of the storage battery based on the battery voltage of the storage battery and a discharge current of the storage battery that are acquired while the starter is being driven;
a storage unit for storing a current/voltage data set as a current/voltage correlation characteristic for each deterioration state of the storage battery classified in accordance with a magnitude of the internal resistance calculated by the internal resistance calculation unit,the current/voltage data set being formed of;
a voltage immediately before the start corresponding to the battery voltage of the storage battery exhibited immediately before the starter is driven; and
a measured starting current obtained by subtracting a current immediately before the start, which corresponds to the discharge current of the storage battery acquired immediately before the starter is driven, from a peak current corresponding to a maximum discharge current of the storage battery acquired while the starter is being driven;
a starting current learning unit for acquiring the current/voltage data set formed of the voltage immediately before the start and the measured starting current as a measurement result each time the starter is actually driven, and updating the current/voltage correlation characteristic stored in the storage unit so as to correspond to the deterioration state classified in accordance with the magnitude of the internal resistance calculated by the internal resistance calculation unit;
a starting current estimation unit for extracting, when determination is made as to whether or not to drive the starter before driving the starter, the current/voltage correlation characteristic corresponding to the deterioration state of the storage battery, which is identified by the magnitude of the internal resistance calculated by the internal resistance calculation unit at a previous time at which the starter is driven, from the storage unit, and estimating an estimated starting current corresponding to the present voltage immediately before the start of the storage battery, which has been acquired, by using the extracted current/voltage correlation characteristic; and
a minimum voltage calculation unit for calculating, when determination is made as to whether or not to drive the starter, the starting minimum voltage in accordance with the following expression;
(starting minimum voltage)=(voltage immediately before start)−
((internal resistance)×
(estimated starting current))based on the estimated starting current that has been estimated by the starting current estimation unit, the present voltage immediately before the start of the storage battery that has been acquired, and the internal resistance of the storage battery calculated by the internal resistance calculation unit at the previous time at which the starter is driven.
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Abstract
It is possible to accurately estimate a starting current and calculate a precise starting minimum voltage without being influenced by a change in a storage battery state or a starting state by updating a current/voltage correlation characteristic corresponding to a deterioration state of a storage battery each time a current/voltage data set obtained when a starter is driven is newly stored in association with the deterioration state of the storage battery and by calculating the starting current corresponding to a present voltage immediately before start in accordance with the current/voltage correlation characteristic corresponding to the present deterioration state of the storage battery when determination is made as to whether or not to drive the starter.
22 Citations
6 Claims
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1. A storage battery state detection apparatus for estimating a starting minimum voltage of a storage battery before a starter is driven and providing the starting minimum voltage to a control device,
the starting minimum voltage corresponding to a voltage value at which a battery voltage of the storage battery drops to a lowest level when the starter is driven, the control device being configured to determine, when determination is made as to whether or not to drive the starter in order to start an internal combustion engine, that the starter is to be driven when the starting minimum voltage of the storage battery is equal to or higher than a threshold value that does not influence the start of the internal combustion engine, the storage battery state detection apparatus comprising: -
an internal resistance calculation unit for calculating an internal resistance of the storage battery to be used as an index of a deterioration state of the storage battery based on the battery voltage of the storage battery and a discharge current of the storage battery that are acquired while the starter is being driven; a storage unit for storing a current/voltage data set as a current/voltage correlation characteristic for each deterioration state of the storage battery classified in accordance with a magnitude of the internal resistance calculated by the internal resistance calculation unit, the current/voltage data set being formed of; a voltage immediately before the start corresponding to the battery voltage of the storage battery exhibited immediately before the starter is driven; and a measured starting current obtained by subtracting a current immediately before the start, which corresponds to the discharge current of the storage battery acquired immediately before the starter is driven, from a peak current corresponding to a maximum discharge current of the storage battery acquired while the starter is being driven; a starting current learning unit for acquiring the current/voltage data set formed of the voltage immediately before the start and the measured starting current as a measurement result each time the starter is actually driven, and updating the current/voltage correlation characteristic stored in the storage unit so as to correspond to the deterioration state classified in accordance with the magnitude of the internal resistance calculated by the internal resistance calculation unit; a starting current estimation unit for extracting, when determination is made as to whether or not to drive the starter before driving the starter, the current/voltage correlation characteristic corresponding to the deterioration state of the storage battery, which is identified by the magnitude of the internal resistance calculated by the internal resistance calculation unit at a previous time at which the starter is driven, from the storage unit, and estimating an estimated starting current corresponding to the present voltage immediately before the start of the storage battery, which has been acquired, by using the extracted current/voltage correlation characteristic; and a minimum voltage calculation unit for calculating, when determination is made as to whether or not to drive the starter, the starting minimum voltage in accordance with the following expression;
(starting minimum voltage)=(voltage immediately before start)−
((internal resistance)×
(estimated starting current))based on the estimated starting current that has been estimated by the starting current estimation unit, the present voltage immediately before the start of the storage battery that has been acquired, and the internal resistance of the storage battery calculated by the internal resistance calculation unit at the previous time at which the starter is driven. - View Dependent Claims (2, 3, 4, 5)
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6. A storage battery state detection method for estimating a starting minimum voltage of a storage battery before a starter is driven and providing the starting minimum voltage to a control device,
the starting minimum voltage corresponding to a voltage value at which a battery voltage of the storage battery drops to a lowest level when the starter is driven, the control device being configured to determine, when determination is made as to whether or not to drive the starter in order to start an internal combustion engine, that the starter is to be driven when the starting minimum voltage of the storage battery is equal to or higher than a threshold value that does not influence the start of the internal combustion engine, the storage battery state detection method comprising: -
an internal resistance calculation step of calculating an internal resistance of the storage battery to be used as an index of a deterioration state of the storage battery based on the battery voltage of the storage battery and a discharge current of the storage battery that are acquired while the starter is being driven; a storage step of storing a current/voltage data set in a storage unit as a current/voltage correlation characteristic for each deterioration state of the storage battery classified in accordance with a magnitude of the internal resistance calculated in the internal resistance calculation step, the current/voltage data set being formed of; a voltage immediately before the start corresponding to the battery voltage of the storage battery exhibited immediately before the starter is driven; and a measured starting current obtained by subtracting a current immediately before the start, which corresponds to the discharge current of the storage battery acquired immediately before the starter is driven, from a peak current corresponding to a maximum discharge current of the storage battery acquired while the starter is being driven; a starting current learning step of acquiring the current/voltage data set formed of the voltage immediately before the start and the measured starting current as a measurement result each time the starter is actually driven, and updating the current/voltage correlation characteristic stored in the storage step in the storage unit so as to correspond to the deterioration state classified in accordance with the magnitude of the internal resistance calculated in the internal resistance calculation step; a starting current estimation step of extracting, when determination is made as to whether or not to drive the starter before driving the starter, the current/voltage correlation characteristic corresponding to the deterioration state of the storage battery, which is identified by the magnitude of the internal resistance calculated in the internal resistance calculation step at a previous time at which the starter is driven, from among the current/voltage correlation characteristics stored in the storage step in the storage unit, and estimating an estimated starting current corresponding to the present voltage immediately before the start of the storage battery, which has been acquired, by using the extracted current/voltage correlation characteristic; and a minimum voltage calculation step of calculating, when determination is made as to whether or not to drive the starter, the starting minimum voltage in accordance with the following expression;
(starting minimum voltage)=(voltage immediately before start)−
((internal resistance)×
(estimated starting current))based on the estimated starting current that has been estimated in the starting current estimation step, the present voltage immediately before the start of the storage battery that has been acquired, and the internal resistance of the storage battery calculated in the internal resistance calculation step at the previous time at which the starter is driven.
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Specification