JP2006333553A - Battery charge state calculating system and method, and battery monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery charge state calculating system which can calculate the charge state of a battery more properly. <P>SOLUTION: This battery charge state computing system, which computes the charge state of a battery 9 that constituts a power system by the combination with an alternator 12, includes a means which regulates the output voltage of the alternator 12 so that the battery charge/discharge may be converge within a specified range, a means which detects the battery voltage in a state that the battery charge/discharge has converged within a specified range, as the open circuit voltage of the battery, and a means which computes the charge state of the battery, based on the open circuit voltage of the battery. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a battery charge state calculation system, a battery charge state calculation method, and a battery monitoring device. More specifically, the present invention relates to a battery charge state calculation system and battery for calculating a state of charge (SOC) of a vehicle-mounted battery. The present invention relates to a charging state calculation method and a battery monitoring apparatus that employs the battery charging state calculation method.

In recent years, hybrid electric vehicles including an engine and a motor that is operated by electric power from a battery have been put into practical use. Appropriate calculation of the state of charge of the battery is necessary in order to appropriately execute the control in places in the hybrid electric vehicle.

As a method for calculating the state of charge of the battery, for example, in Patent Document 1 below, the battery open state voltage is estimated based on the battery current, voltage, and internal resistance, and the battery state of charge is determined from the battery open state voltage. It is disclosed to calculate. This utilizes the fact that the correlation as shown in FIG. 14 is established between the open-circuit voltage of the battery and the state of charge (charge rate) of the battery.
However, if the discharge rate of the battery becomes too large, the internal resistance of the battery cannot be strictly defined. For this reason, the open circuit voltage of the battery cannot be accurately obtained, and the estimation accuracy of the state of charge of the battery is lowered.

Further, in Patent Document 2 below, the battery current is divided by a period from 0 [A] state to next 0 [A], which is defined as a current pulse, and an average current value of the divided current pulses. Based on the above, it is disclosed to calculate the state of charge of the battery.
However, when the operation rate of an electric load such as an ECU (Electronic Control Unit) is high (when the charging state is continued), or when the battery is fully charged (when the discharging state is continued).
The fluctuation of the battery current is as shown in FIG. That is, when the charged state or the discharged state is continued, the battery current does not become 0 [A], so the open circuit voltage of the battery cannot be obtained, and the above-described method cannot calculate the battery charged state.

Patent Document 3 below discloses that the battery current is monitored, the battery current value is integrated to calculate the amount of electricity, and the state of charge of the battery is calculated based on this amount of electricity.
However, since this amount of electricity is obtained by integrating the battery current values, there is a possibility that an integration shift will occur. For this reason, when the state of charge of the battery by such calculation is continued for a long period of time, an error occurs between the state of charge of the battery and the actual value.

Further, if the calculation accuracy of the state of charge of the battery is to be further increased, not only the battery current and the battery voltage but also other factors such as the temperature of the electrolyte solution (hereinafter also referred to as the battery solution) constituting the battery solution, etc. However, none of Patent Documents 1 to 3 discloses the calculation of the state of charge of the battery by sufficiently adding factors other than the battery current and the battery voltage.
JP 2000-306613 A JP 2000-4502 A JP 2004-93551 A

Means for solving the problems and their effects

The present invention has been made in view of the above problems, and an object thereof is to provide a battery charge state calculation system, a battery charge state calculation method, and a battery monitoring device that can more appropriately calculate the state of charge of the battery. Yes.

In order to achieve the above object, a battery charge state calculation system (1) according to the present invention is a battery charge state calculation system that calculates a charge state of a battery that constitutes a power supply system in combination with a generator. A battery charge / discharge convergence generator output voltage adjusting means for adjusting the output voltage of the generator so as to converge within a predetermined range; and a battery voltage in a state where the battery charge / discharge converges within the predetermined range. Battery open-circuit voltage detection means for detecting the open-circuit voltage of the battery, and battery charge state calculation means for calculating the charge state of the battery based on the open-circuit voltage of the battery detected by the battery open-circuit voltage detection means. It is a feature.

The battery voltage when the battery current stops flowing (that is, when the battery current value is 0 [A]) is the open circuit voltage of the battery. Therefore, even if the battery voltage when the battery current almost stops flowing (for example, when the battery current value is within 1 [A]) is handled as the open circuit voltage of the battery, there is no problem.
Further, as described in the section of “Background Art”, since the correlation as shown in FIG. 14 is established between the battery open voltage and the battery charge state, based on the battery open voltage, The state of charge of the battery can be determined.

According to the battery charge state calculation system (1), the output voltage of the generator is set so that the battery charge / discharge converges within the predetermined range (for example, the battery current value is within 1 [A]). Is adjusted, and the battery voltage at this time is detected as the open voltage of the battery.
Therefore, the open circuit voltage of the battery is appropriately detected. In addition, since the state of charge of the battery is calculated based on the battery open-circuit voltage appropriately detected in this way, the state of charge of the battery can be appropriately obtained.

In the battery charge state calculation system (2) according to the present invention, in the battery charge state calculation system (1), the battery charge / discharge convergence generator output voltage adjustment means has the same value as the battery voltage value. The output voltage of the generator is adjusted.

According to the battery charge state calculation system (2), the output voltage of the generator is adjusted so as to be equal to the battery voltage value. If the battery voltage value and the output voltage of the generator are the same value, the voltage value is balanced and the battery current does not flow. Thereby, the open circuit voltage of a battery can be detected more appropriately.

Further, the battery charge state calculation system (3) according to the present invention has the same value as the battery voltage value after a predetermined time has elapsed after completion of engine start in the battery charge state calculation system (2). The battery charge / discharge convergence generator output voltage adjusting means adjusts the output voltage of the generator.

According to the battery charge state calculation system (3), a period from when the starter is driven to when the engine start is completed (that is, a period in which the battery voltage value repeats abrupt changes).
Instead, after the engine start is completed, the output voltage of the generator is adjusted based on the battery voltage value after the predetermined time has elapsed (that is, after the change has stabilized). Therefore, the battery charge / discharge can be appropriately converged within the predetermined range.

In the battery charge state calculation system (4) according to the present invention, in the battery charge state calculation system (2) or (3), the battery charge / discharge convergence generator output voltage adjusting means has the same value as the battery voltage value. The output voltage of the generator is roughly adjusted so that the output voltage of the generator is finely adjusted based on the battery current value so that the battery charge / discharge is converged within the predetermined range. It is characterized by being.

As a method of adjusting the output voltage of the generator so as to be the same value as the battery voltage value,
A method of issuing a command to the output voltage of the generator based on information (battery voltage value) obtained from the battery voltage sensor so as to be the same value as the battery voltage value (for example, 12 [V]) at that time Is mentioned. Thereby, the output voltage of the generator can be adjusted to 12 [V].

However, when the output voltage of the generator is adjusted to 12 [V], the battery voltage value changes under the influence. For example, while adjusting the output voltage of the generator to 12 [V], the battery voltage rises to 12.5 [V], and the battery current value does not become 1 [A] or less. It is conceivable that charging / discharging does not converge within the predetermined range.

According to the battery charge state calculation system (4), the output voltage of the generator is adjusted based on the battery current value after the output voltage of the generator is roughly adjusted so as to be equal to the battery voltage value. Tweaked. For example, after the output voltage of the generator is roughly adjusted based on information (battery voltage value) obtained from the battery voltage sensor so as to be equal to the battery voltage value (for example, 12 [V]) at that time Even if the battery voltage value becomes 12.5 [V], the output voltage of the generator is finely adjusted based on the battery current value at that time. When the battery is being charged, the output voltage of the generator is reduced, and when the battery is being discharged,
The output voltage of the generator will rise.

Thereby, even if the battery charge / discharge cannot be converged within the predetermined range only by the adjustment based on the battery voltage value, the output voltage of the generator is finely adjusted based on the battery current value. Therefore, battery charge / discharge can be reliably converged within the predetermined range. When the battery current value is large, the fine adjustment range is large, and when the battery current value is small, the fine adjustment range is small.

Further, the battery charge state calculation system (5) according to the present invention is the battery charge state calculation system (4), wherein the battery charge / discharge convergence generator output voltage adjustment means is configured to have a battery current value and a certain magnitude. The output voltage of the generator is finely adjusted based on the battery capacity expressed by the amount of electricity charged / discharged when the voltage fluctuates.

As described above, the adjustment based on the battery current value is performed when the battery is being charged, in order to suppress the amount of charge electricity, the output voltage of the generator is decreased, and the battery is being discharged.
In order to suppress the amount of discharged electricity, the output voltage of the generator is increased, and the fine adjustment width is set based on the magnitude of the battery current value.

By the way, the width of the fine adjustment is largely related to the battery capacity. For example, when the battery capacity is 1000 [Asec] (represented by the amount of electricity that is charged and discharged when the voltage varies by 1 [V]),
When the battery voltage fluctuates by 0.1 [V], the charge / discharge electricity amount becomes 100 [Asec], whereas when the battery capacity is 800 [Asec], the battery voltage fluctuates by 0.1 [V]. The charge / discharge amount is 80 [Asec]. That is, when the battery capacity is different, the speed at which the battery charge / discharge is converged changes.

According to the battery charge state calculation system (5), since the output voltage of the generator is finely adjusted based on not only the battery current value but also the battery capacity, the battery charge / discharge is further reduced within the predetermined range. It can be surely converged.

Further, a battery charge state calculation system (6) according to the present invention shows a battery open voltage detected by the battery open voltage detection means in any one of the battery charge state calculation systems (1) to (5). A plurality of open-circuit voltage data storage means for storing the data, and an open-circuit voltage data storage means for storing data indicating the open-circuit voltage of the battery in the open-circuit voltage data storage means, and the battery charge state calculation means The battery charge state is calculated based on the battery open voltage indicated by the data stored in the plurality of open voltage data storage means.

According to the battery state-of-charge calculation system (6), since the state of charge of the battery is obtained based on data obtained from a plurality of measurements, not just one time, sufficient accuracy can be obtained. Become. For example, it may be possible to adopt an average value of a plurality of data.

Moreover, the battery charge state calculation system (7) according to the present invention is the battery charge state calculation system (1) to (6), wherein the battery charge state calculation means includes a battery open voltage and a battery charge. It is characterized in that the state of charge of the battery is calculated using a map showing the relationship with the state.

A correlation as shown in FIG. 14 is established between the open-circuit voltage of the battery and the state of charge of the battery.
According to the battery charge state calculation system (7), the charge state of the battery is calculated using a map showing the relationship between the open circuit voltage of the battery and the charge state of the battery.
The state of charge of the battery can be easily determined.

Further, the battery charge state calculation system (8) according to the present invention is the map used for calculating the charge state of the battery based on the temperature of the electrolytic solution constituting the battery in the battery charge state calculation system (7). Is configured to be determined.

A correlation as shown in FIG. 14 is established between the open-circuit voltage of the battery and the state of charge of the battery, and this relationship is largely related to the temperature of the electrolyte (battery liquid) constituting the battery.
According to the battery charge state calculation system (8), the map used for calculation of the battery charge state is determined based on the temperature of the battery liquid. That is, since the state of charge of the battery is calculated based on the temperature of the battery liquid as well as the open voltage of the battery,
The state of charge of the battery can be determined more appropriately.

The battery charge state calculation system (9) according to the present invention is based on the battery capacity represented by the amount of electricity that is charged and discharged when a voltage fluctuation of a certain magnitude in the battery charge state calculation system (7) or (8). The map used for calculating the state of charge of the battery is determined.

A correlation as shown in FIG. 14 is established between the open-circuit voltage of the battery and the state of charge of the battery, and this relationship is largely related to the battery capacity.
According to the battery charge state calculation system (9), the map used for calculation of the battery charge state is determined based on the battery capacity. That is, since the state of charge of the battery is calculated based on not only the open circuit voltage of the battery but also the battery capacity, the state of charge of the battery can be obtained more appropriately.

Moreover, the battery charge state calculation system (10) according to the present invention is based on the amount of change in battery voltage with respect to a certain amount of charge and / or discharge in the battery charge state calculation system (5) or (9). The battery capacity calculating means for calculating the battery capacity is provided.

According to the battery state-of-charge calculation system (10), the battery capacity (the amount of electricity that is charged and discharged when a voltage fluctuation of a certain magnitude) is calculated based on the battery voltage value that is an actual value instead of a theoretical value. Therefore, the accuracy becomes high. As a result, the accuracy of the state of charge of the battery is also increased.

Moreover, the battery charge state calculation system (11) according to the present invention is a battery charge state adjustment system that adjusts the output voltage of the generator so that a battery current of a certain magnitude or more flows in the battery charge state calculation system (10). A discharge generator output voltage adjusting means is provided.

As a method of calculating the battery capacity (the amount of electricity charged / discharged when a voltage fluctuation of a certain magnitude), the magnitude of the amount of electricity while charging or discharging a certain magnitude (for example, 100 [Asec]) is used. A method of detecting whether there has been a voltage fluctuation is conceivable. For example, 1
When the battery voltage drops by 0.1 [V] while the amount of electricity of 00 [Asec] is discharged, 1
The amount of electricity charged and discharged when the battery voltage fluctuates in [V] is 1000 [Asec].

Therefore, in order to calculate the battery capacity from this method, a battery current (greater than a certain level) needs to flow. In other words, the battery capacity cannot be calculated unless the voltage value is balanced between the battery voltage and the output voltage of the generator and the battery current is not flowing. Further, it is desirable that a battery current of a certain magnitude or more flows.

According to the battery state-of-charge calculation system (11), the output voltage of the generator is adjusted so that a battery current of a certain magnitude or more flows, so that the battery capacity can be obtained from the above method.

Further, the battery charge state calculation system (12) according to the present invention is the battery charge state calculation system (11), wherein the battery charge / discharge generator output voltage adjusting means is charging or discharging the battery. The direction in which the output voltage of the generator is adjusted is determined based on whether the battery is in a fully charged state or not.

In the case where the battery is not fully charged, it is desirable to reflect the meaning of use of the generator (alternator) to “charge the battery until it is fully charged”. Conversely, when the battery is fully charged, it is necessary to adjust the output voltage of the generator in the discharge direction in order to flow the battery current.

In addition, when a battery current of a certain magnitude or more is allowed to flow, if the battery is being charged, it is desirable to adjust the output voltage of the generator in a direction that increases the amount of charged electricity, and the battery is being discharged. If so, it is desirable to adjust the output voltage of the generator in a direction in which the amount of discharge electricity increases.

According to the battery charge state calculation system (12), the output voltage is adjusted based on whether the battery is being charged or discharged, or whether the battery is fully charged. Since it is determined (that is, whether to increase or decrease), the output voltage can be adjusted in an appropriate direction for calculating the battery capacity.

Further, the battery charge state calculation system (13) according to the present invention is the battery charge state calculation system (12), wherein the battery charge / discharge generator output voltage adjustment means is based on the magnitude of the battery current. It is characterized by determining an increase / decrease value of the output voltage of the generator.

The battery capacity calculation process is an exceptional process, and it is not preferable to greatly change the output voltage of the generator for this process. Therefore, it is desirable to keep the fluctuation range small.
According to the battery charge state calculation system (13), the increase / decrease value of the output voltage of the generator is determined based on the magnitude of the battery current. Therefore, it is possible to prevent the output voltage of the generator from being adjusted more than necessary in order to secure a battery current of the predetermined value or more.

Further, the battery charge state calculation system (14) according to the present invention is the battery charge state calculation system (11) to (13), wherein the battery charge / discharge generator output voltage adjustment means is configured to have the battery capacity. Based on the above, the increase / decrease value of the output voltage of the generator is corrected.

The battery current is affected not only by the battery voltage and the output voltage of the generator, but also by the battery capacity. For example, when the battery capacity is 1000 [Asec] when the battery capacity is 1000 [Asec] (represented by the amount of electricity that is charged and discharged when the voltage changes by 1 [V]), the charge and discharge electricity is 100 In contrast to [Asec], when the battery capacity is 800 [Asec] and the battery voltage fluctuates by 0.1 [V], the charge / discharge electricity amount becomes 80 [Asec]. That is,
If the battery capacity is different, the speed at which the battery charge / discharge is converged changes.
According to the battery charge state calculation system (14), since the output voltage of the generator is adjusted in consideration of the battery capacity, the battery current can be adjusted appropriately.

The battery charge state calculation system (15) according to the present invention is the battery charge state calculation system according to any one of the battery charge state calculation systems (11) to (14). If the charge / discharge electricity amount greater than or equal to a predetermined value is not detected even after a predetermined time has elapsed since the output voltage was adjusted, the output voltage of the generator is adjusted again. .

According to the battery charge state calculation system (15), the predetermined value (for example, even if the predetermined time elapses after the output voltage of the generator is adjusted by the battery charge / discharge generator output voltage adjusting means). , 100 [Asec]) or more, it can be determined that a sufficiently large battery current is not flowing.
In such a case, since the output voltage of the generator is adjusted again, even if a sufficient amount of battery current does not flow in a single adjustment, the adjustment is repeated, so that a sufficiently large battery Current can flow.

Moreover, the battery charge state calculation system (16) according to the present invention is the battery charge state calculation system (10) to (15), wherein the battery voltage changes with respect to the charge and / or discharge of the certain magnitude. A plurality of voltage change amount data storage means for storing data indicating the amount; and a voltage change amount storage means for storing the data indicating the change amount in the voltage change amount data storage means; However, the battery capacity is calculated based on the change amount indicated by the data stored in the plurality of voltage change amount storage means.

According to the battery charge state calculation system (16), since the battery capacity is obtained based on data obtained from multiple times of charging or discharging, not only one time of data,
Sufficient accuracy can be obtained. For example, it may be possible to adopt an average value of a plurality of data.

The battery charge state calculation system (17) according to the present invention includes a battery capacity used for a calculation process in any of the battery charge state calculation systems (10) to (16), and the battery capacity calculation unit. Battery capacity comparison means for comparing the calculated battery capacity with the battery capacity calculation means, and based on the comparison result by the battery capacity comparison means, the battery capacity used for the certain calculation process is calculated by the battery capacity calculation means It is characterized by being configured to be updated.

According to the battery charge state calculation system (17), the battery capacity used for the certain calculation process (for example, adjustment of the output voltage of the generator) is updated based on the comparison result. For example, it is updated when there is a difference greater than a certain value. Thereby, the accuracy of the certain calculation process can be increased.

In addition, the battery charge state calculation system (18) according to the present invention is a charge / discharge electric quantity that is calculated by integrating the battery current value in any one of the battery charge state calculation systems (1) to (17). A discharge electricity amount calculating means; and a battery charge state correcting means for correcting the charge state of the battery calculated by the battery charge state calculating means based on the charge / discharge electricity amount calculated by the charge / discharge electricity amount calculating means. It is characterized by having.

The battery current value does not always become 0 [A]. Also, it is not very preferable to adjust the output voltage of the generator to frequently create a state where the battery current value becomes 0 [A]. That is, there is a limit in calculating the state of charge of the battery based on the open circuit voltage of the battery.

By the way, as described in the “Background Art” item, it is possible to determine how much the state of charge of the battery has changed based on the charge / discharge amount of electricity obtained by integrating the battery current values. For example, when the amount of electricity of 3000 [Asec] is charged, it can be determined that the charging rate has increased by 6 points. Conversely, when the amount of electricity of 3000 [Asec] is discharged, the charging rate is 6 points. It can be judged that it fell.

According to the battery charge state calculation system (18), the charge state of the battery (that is, the battery) calculated by the battery charge state calculation means based on the charge / discharge electricity amount obtained by integrating the battery current values. The battery charge state determined based on the open circuit voltage is corrected. Therefore, even if there is a limit to the calculation of the state of charge of the battery based on the open circuit voltage of the battery, an appropriate state of charge of the battery can always be obtained by calculating the amount of charge / discharge.

The battery charge state calculation system (19) according to the present invention is the battery charge state calculation system (18), wherein the battery charge state correction means is calculated by the charge / discharge electricity amount calculation means. The battery charge state calculated by the battery charge state calculation means is corrected based on the temperature of the electrolyte solution constituting the battery.

There is a correlation between the amount of charge / discharge electricity and the change in the state of charge of the battery, but this is largely related to the temperature of the electrolyte solution constituting the battery.
According to the battery charge state calculation system (19), the charge state of the battery is corrected based on not only the amount of charge / discharge electricity but also the temperature of the electrolyte (battery liquid) constituting the battery. The state can be determined more appropriately.

Further, the battery charge state calculation system (20) according to the present invention, in the battery charge state calculation system (18) or (19), when the correction process by the battery charge state correction means exceeds a certain limit, It is characterized in that the state of charge of the battery to be corrected is updated.

The amount of charge / discharge electricity is obtained by integrating the battery current. For this reason, if this integration continues for a long period of time, there is a risk of deviation in integration. Further, if the correction based on the charge / discharge electricity amount is continued for a long period of time, there is a possibility that a deviation from a regular value may occur.
According to the battery state-of-charge calculation system (20), when the correction process exceeds a certain limit (for example, when it continues for a predetermined period or when the number of corrections reaches a predetermined number), it becomes the target of the correction. The charge state of the battery is updated. That is, when the correction based on the charge / discharge electricity amount continues for a long period of time, the output voltage of the generator is adjusted so that the battery charge / discharge converges within a predetermined range, and the battery charge is determined based on the open circuit voltage of the battery. A state is calculated. Thereby, since the charge state of the battery to be corrected is updated, the deviation from the normal value can be eliminated.

The battery charge state calculation method (1) according to the present invention is a battery charge state calculation method for calculating a charge state of a battery constituting a power supply system in combination with a generator. The battery charge / discharge converges within a predetermined range. To adjust the output voltage of the generator, to detect the battery voltage in a state where the battery charge and discharge converged within the predetermined range as a battery open voltage, based on the detected battery open voltage, It is characterized in that the state of charge of the battery is calculated.

The battery voltage when the battery current stops flowing (that is, when the battery current value is 0 [A]) is the open circuit voltage of the battery. Therefore, even if the battery voltage when the battery current almost stops flowing (for example, when the battery current value is within 1 [A]) is handled as the open circuit voltage of the battery, there is no problem.
Further, as described in the section of “Background Art”, since the correlation as shown in FIG. 14 is established between the battery open voltage and the battery charge state, based on the battery open voltage, The state of charge of the battery can be determined.

According to the battery charge state calculation method (1), the output voltage of the generator is set so that the battery charge / discharge converges within the predetermined range (for example, the battery current value is within 1 [A]). Since the battery voltage at this time is detected as the open circuit voltage of the battery, the open circuit voltage of the battery can be detected appropriately. Therefore, the state of charge of the battery can be obtained appropriately.

Moreover, the battery monitoring device (1) according to the present invention provides the battery charge state calculation method (1).
It is characterized by having a computer that executes.
By mounting the battery monitoring device (1) on the vehicle, the state of charge of the battery can be determined appropriately.

Hereinafter, embodiments of a battery charge state calculation system, a battery charge state calculation method, and a battery monitoring device according to the present invention will be described with reference to the drawings. FIG. 1A shows an embodiment (
1 is a block diagram schematically showing a main part of a battery charge state calculation system according to 1), and FIGS. 1B and 1C show a buffer memory. FIG. In the figure, reference numeral 1 denotes a battery monitoring device (adopting the battery charge state calculation method according to the present invention), and a battery 9 is connected to the battery monitoring device 1 via a voltage sensor 10 so that power is supplied. It has become. The battery 9 is connected not only to the battery monitoring device 1 but also to an alternator (generator) 12 and an electric load 14 such as various ECUs via voltage sensors 10 and 13.

The battery monitoring device 1 is connected to a microcomputer 2 and a voltage sensor 10 for detecting the battery voltage (monitors the value of the voltage sensor 10 and converts an analog signal into a digital signal).
The voltage value monitor circuit 3, the voltage value monitor circuit 4 connected to the voltage sensor 13 for detecting the output voltage of the alternator 12, and the current sensor 11 for detecting the battery current (of the current sensor 11) And a current value monitor circuit 5 that monitors the value and converts an analog signal into a digital signal. The microcomputer 2 includes a battery charge rate calculation unit 2a, a battery capacity update unit 2b, and a charge rate correction unit 2c.

The microcomputer 2 is connected to an EEPROM 6 for storing various data.
Can read and write data stored in the EEPROM 6.
In the EEPROM 6, for example, data indicating the battery capacity C expressed by the amount of electricity that is charged and discharged when the voltage changes by 1 [V] is stored. The default value of this data is written in advance by a manufacturer or the like.

The microcomputer 2 includes a starter switch 7, an engine speed sensor 8, and a battery 9.
Is connected to a temperature sensor 15 that detects the temperature of the electrolyte solution (hereinafter also referred to as battery fluid), so that the starter switch 7 can be turned on / off, the engine speed, and the battery fluid temperature can be grasped. It has become. The microcomputer 2 can control the alternator 12 and can adjust the output voltage of the alternator 12.

Next, the processing operation [1] performed by the microcomputer 2 in the battery monitoring device 1 constituting the battery charge state calculation system according to the embodiment (1) is shown in the flowchart shown in FIG. 2, and in FIG. 3 and FIG. This will be described based on the timing chart. This processing operation [1] is an operation performed every predetermined cycle.

First, the starter is driven, and after completion of the engine start, a predetermined time t1 (for example, 5 seconds)
It is determined whether or not elapses (step S1). Normally, when the engine speed reaches a certain speed (for example, 800 rpm), the engine ECU determines that the engine has been started, and turns off the starter switch 7. Therefore, it can be determined whether or not the engine has been started based on the engine speed and the on / off state of the starter switch 7.

The starter is driven (time T1 in FIGS. 3 and 4), and after engine start is completed (time T2 in FIGS. 3 and 4), a predetermined time t1 has elapsed (time T3 in FIGS. 3 and 4), and the battery voltage If it is determined that the change in the value and the current value is stable, then the “calculation of the battery charge rate SOC based on the open circuit voltage of the battery” processing is performed (step S2: see FIG. 5), and then “battery capacity C Update "processing is performed (step S3: see FIG. 9). On the other hand, if it is determined that the engine start has not been completed or the engine start has been completed but the predetermined time t1 has not elapsed, the processing operation [1] is terminated as it is.

Next, “correction of battery charge rate SOC based on charge / discharge electricity amount” processing is performed (step S4: refer to FIG. 12), and then this correction processing is started for a predetermined time t2 (for example, 12
It is determined whether or not (0 minute) has elapsed (step S5). If it is determined that the predetermined time t2 has elapsed (that is, the correction process has continued for a long period of time and the battery charge rate SOC determined by the correction process may deviate from a normal value), Returning to step S2, the "calculation of the battery charge rate SOC based on the open circuit voltage of the battery" process is performed again.
That is, the battery charge rate SOC to be corrected is updated. On the other hand, the predetermined time t
If it is determined that 2 has not elapsed, the process returns to step S4.

Next, the processing operation “calculation of the battery charge rate based on the battery open voltage” (step S2 in FIG. 2) performed by the microcomputer 2 in the battery monitoring device 1 constituting the battery charge state calculation system according to the embodiment (1). Description will be made based on the flowchart shown in FIG. 5 and the timing charts shown in FIGS.

First, based on the data obtained from the voltage value monitor circuit 3, the battery voltage value Va at that time (time T3 in FIGS. 3 and 4) is detected (step S11), and from the EEPROM 6 (1 [V
] Is read out (represented by the amount of electricity charged / discharged when the voltage changes)] (step S1)
2) Next, the alternator 12 is controlled so that the output voltage of the alternator 12 becomes the voltage Va having the same magnitude as the battery voltage value (step S13). That is, the battery voltage and the output voltage of the alternator 12 are balanced and the battery current does not flow.

Next, based on the data obtained from the current value monitor circuit 5, at that time (time T4 in FIG.
The battery current value Ia at time T8) in FIG. 4 is detected (step S14), and the battery current value I is detected.
Based on a, it is determined whether or not the amount of electricity discharged from the battery 9 or the amount of electricity charged is very small (for example, within 1 [A]) and is in a state where it can be said that “no charge / discharge”. (Step S15).

If it is determined that the state can be said to be “no charge / discharge” (time T4 in FIG. 3), then the time t after the state “no charge / discharge” can be determined is a predetermined time t3 (for example, 5 seconds). It is determined whether or not this is the case (step S16). If it is determined that the time t is equal to or greater than the predetermined time t3 (that is, the balance between the battery voltage and the output voltage of the alternator 12 is maintained for the predetermined time t3 or longer), the data obtained from the voltage value monitor circuit 3 Based on the above, the battery voltage value Vb at that time (time T5 in FIG. 3) is detected (step S17), and the battery voltage value Vb is written in the buffer memory MA (FIG. 1B) as the open voltage of the battery 9 (step S17). S18
). On the other hand, if it is determined that the time t is not greater than or equal to the predetermined time t3, the process returns to step S14.

As shown in FIG. 1B, the buffer memory MA includes n buffer memories MA1 to MAn, and the battery voltage value Vb is sequentially written from the buffer memory MA1. When data is written up to the buffer memory MAn, data is written again from the buffer memory MA1.

Next, it is determined whether or not the battery voltage value Vb has been written to the buffer memory MA more than n times (that is, whether or not the buffer memory MAn has been written) (step S19). If not, the time t is reset to 0 (step S20), the process returns to step S14, and the battery voltage value Vb when the predetermined time t3 has elapsed is detected again. At the second time, the battery voltage value Vb at the time T7 shown in FIG. 3 is detected.

On the other hand, if it is determined in step S19 that the battery voltage value Vb has been written to the buffer memory MA more than n times, based on the battery voltage value Vb written in the n buffer memories MA1 to MAn. The open circuit voltage V1 of the battery 9 is calculated (step S21). For example, an average value of the battery voltage values Vb written in the buffer memories MA1 to MAn is set as the open circuit voltage V1 of the battery 9.

Next, it should be used based on the battery capacity C from the charge rate map for obtaining the charge rate SOC of the battery 9 as shown in FIG. 6 stored in the ROM (not shown) in the microcomputer 2. A map is selected (step S22). Therefore, if the battery capacity C is C1 or higher, the upper map is selected. If the battery capacity C is C2 or higher and lower than C1, an interruption map is selected. If the battery capacity C is lower than C2, the lower map is selected. The map will be selected.

Using the selected map, the charging rate SOC of the battery 9 is calculated based on the open circuit voltage V1 of the battery 9 (step S23). For example, the battery capacity C is C1 or more (FIG. 6).
If the open-circuit voltage V1 of the battery 9 is 12 [V], the battery 9 is used.
The charging rate SOC is 50%.

Next, the temperature TE of the battery fluid is detected from the data obtained from the temperature sensor 15 (step S24), and the charging rate SOC of the battery 9 is corrected based on the temperature TE of the battery fluid (step S25). As shown in FIG. 7 (a), the charging rate SOC of the battery 9 has a temperature characteristic depending on the battery liquid temperature. Therefore, the battery 9 is charged using the map shown in FIG. 7 (b). The rate SOC is corrected. For example, the battery liquid temperature TE is −20 [° C.] (correction coefficient is 0.5), the battery capacity C is C1 or more (using the upper map in FIG. 6), and the open voltage V1 of the battery 9 is 12 [ V], the charging rate SOC of the battery 9 is 25% (= 50).
% × 0.5).

Further, in step S15, it is not in a state where it can be said that “no charge / discharge” (time T8 in FIG. 4).
Then, the correction value of the output voltage of the alternator 12 which is stored in the ROM (not shown) in the microcomputer 2 and is suitable for converging the battery current as shown in FIG. Based on the battery capacity C, a map to be used is selected from the voltage correction map for obtaining (step S26). For example, if the battery capacity C is C1 or more, the upper map is selected, and if the battery capacity C is less than C2, the lower map is selected.

Next, using the selected map, a voltage correction value V2 is calculated based on the battery current value Ia (step S27). For example, if the battery capacity C is C2 or more and less than C1 (using the interruption map of FIG. 8), and the battery current value Ia is +80 [A] (charging), the voltage correction value V2 is −0.28 [V If the battery capacity C is C1 or more (using the upper map in FIG. 8) and the battery current value Ia is −100 [A] (during discharging), the voltage correction value V2 is +0.5 [ V].

Next, the alternator 12 is controlled based on the voltage correction value V2, and the alternator 12 is controlled.
Is adjusted to an appropriate value (step S28), and then the process returns to step S14. For example, when the voltage correction value V2 is −0.28 [V], the output voltage of the alternator 12 is adjusted to decrease by 0.28 [V], and the voltage correction value V2 is +0.5 [V]. V], the output voltage of the alternator 12 is adjusted to increase by 0.5 [V]. Thereby, battery current can be converged. If the correction does not converge with one correction, the process is repeated twice and three times.

Next, the processing operation “updating battery capacity” performed by the microcomputer 2 in the battery monitoring apparatus 1 constituting the battery charge state calculation system according to the embodiment (1) (step S3 in FIG. 2).
) Will be described based on the flowchart shown in FIG. 9 and the timing chart shown in FIG.

First, based on the data obtained from the voltage value monitor circuit 3, at that time (time T2 in FIG.
1) detects the battery voltage value Vc (step S31), and then detects the battery current value Ib at that time based on the data obtained from the current value monitor circuit 5 (step S32).
Then, as shown in FIG. 11, stored in a ROM (not shown) in the microcomputer 2,
Based on the battery capacity C, a map to be used is selected from a voltage correction map for obtaining a correction value of the output voltage of the alternator 12 suitable for allowing a battery current of a certain magnitude or more to flow (step S33). For example, if the battery capacity C is C1 or more, the upper map is selected, and if the battery capacity C is less than C2, the lower map is selected.

Next, using the selected map, the voltage correction value V3 is calculated based on the state of charge of the battery 9 (not full charge / full charge) and the battery current value Ib (step S34).
. For example, if the battery capacity C is C2 or more and less than C1 (using the interruption map of FIG. 11) and the battery current value Ib is +80 [A] (charging), the voltage correction value V3 is 0.07 [V].
If the battery capacity C is C1 or more (using the upper map of FIG. 11) and the battery current value Ib is −60 [A] (during discharging), the voltage correction value V3 is −0.1 [ V].

When the battery capacity C is less than C2 (using the lower map in FIG. 11) and the battery current value Ib is 0 [A], when the battery 9 is not fully charged, the voltage correction value V3 is 0.5 [
On the other hand, when the battery 9 is fully charged, the voltage correction value V3 is −0.5 [V]. It should be noted that the battery 9 is “fully charged” because the gassing point (the charging rate is 9
2%) or more.

  As is clear from FIG. 11, when the state of charge of the battery 9 is not fully charged, the voltage correction value V3 becomes positive and the battery voltage value is corrected so as to increase. The meaning of use of the alternator 12 that the battery is charged until it becomes is reflected.

Further, when the battery capacity C is large, a large amount of current is required for charging.
It is necessary to increase the voltage difference between the alternator 12 and the battery 9. On the other hand, battery capacity C
When the battery voltage is small, the battery voltage increases with a small current. For this reason, when the battery capacity C is small, unless the voltage correction range is increased, the battery capacity C is immediately fully charged (or cannot be discharged any more), and the battery capacity C cannot be detected properly. . Therefore, as shown in FIG. 11, when the battery capacity C is large, it is necessary to reduce the correction width, and when the battery capacity C is small, it is necessary to increase the correction width.

Next, the alternator 12 is controlled based on the voltage correction value V3, and the alternator 12 is controlled.
Is adjusted to an appropriate value (step S35), and thereafter calculation of the amount of electricity charged / discharged (charged or discharged) from the battery 9 is started based on the data obtained from the current value monitor circuit 5 (Step S36). The amount of electricity charged / discharged from the battery 9 can be obtained by integrating the (battery current value) obtained from the current value monitor circuit 5 every certain period.

Next, it is determined whether or not a predetermined time (for example, 120 seconds) has elapsed since the start of calculation of the charge / discharge electricity amount (step S37), and if it is determined that the predetermined time has not elapsed, It is determined whether the amount of electricity charged / discharged from the battery 9 is equal to or greater than I1 (for example, 100 [Asec]) (step S38).

If it is determined that the amount of electricity charged / discharged from the battery 9 is equal to or greater than I1 (time T22 in FIG. 10), the calculation of the amount of charge / discharge ends (step S39), and then from the voltage value monitor circuit 3 Based on the obtained data, the battery voltage value Vd at this time is detected (step S40).
). On the other hand, if it is determined that the amount of electricity charged / discharged from the battery 9 is not equal to or greater than I1,
The process returns to step S37.

After the battery voltage value Vd is detected, the battery 9 is charged with the amount of electricity I1 or while the battery 9 is discharged with the amount of electricity I1 (between times T21 and T22 in FIG. 10).
Battery voltage fluctuation amount ΔV (= | Vc−Vd |) is calculated (step S41).
Thereafter, the battery capacity C ′ (represented by the amount of electricity charged / discharged when the battery voltage fluctuates by 1 [V]) during this period is calculated from the following equation (step S42).
C ′ = (1 / ΔV) × I1
For example, the battery voltage value Vc is 12.5 [V] and the battery voltage value Vd is 12.6 [V].
], When the amount of electricity I1 is 100 [Asec], the battery capacity C ′ is 1000 [Asec].

Thereafter, the battery capacity C ′ obtained by the calculation is stored in the buffer memory MB (FIG. 1).
(C)) is written (step S43). As shown in FIG. 1C, the buffer memory M
B is composed of m buffer memories MB1 to MBm, and the battery capacity C ′ is sequentially written from the buffer memory MB1. When data is written up to the buffer memory MBm, data is written again from the buffer memory MB1.

Next, it is determined whether or not the number of times of writing the battery capacity C ′ to the buffer memory MB has reached m times or more (that is, whether or not the buffer capacity MBm has been written) (step S).
44) If it is determined that the number of times of writing is not more than m, the process returns to step S31.
The calculation process of the battery capacity C ′ is performed again. At the second time, the time T22 to T shown in FIG.
The battery capacity C ′ is calculated based on the fluctuation amount ΔV of the battery voltage between 23. In addition, in any case of time T21-T22 and time T22-T23, the magnitude | size of the electric charge charged / discharged from the battery 9 is I1.

On the other hand, if it is determined in step S44 that the number of times the battery capacity C ′ is written to the buffer memory MB is m or more, based on the battery capacity C ′ written in the m buffer memories MB1 to MBm, The battery capacity C ″ (represented by the amount of electricity charged / discharged when the battery voltage fluctuates by 1 [V]) is calculated (step S45). For example, the average value of the battery capacities C ′ written in the buffer memories MB1 to MBm. Is the battery capacity C ″.

It is determined whether or not the difference between the battery capacity C ″ obtained by calculation and the battery capacity C used so far (ie, the battery capacity C stored in the EEPROM 6) is equal to or greater than a predetermined value. If it is determined that the difference between the two is equal to or greater than the predetermined value (step S46), the battery capacity C ″ obtained by the calculation is set as a new battery capacity C (
Thereafter, the new battery capacity C is overwritten on the EEPROM 6 (step S47) (step S47).
Step S48). On the other hand, if it is determined that the difference between the two is not greater than or equal to the predetermined value, the processing operation “updating battery capacity” is terminated.

In step S37, the predetermined time has elapsed since the start of calculation of the charge / discharge electricity amount (that is, even if the predetermined time has elapsed since the start of calculation of charge / discharge electricity amount, In order to readjust the output voltage of the alternator 12 again, assuming that the output voltage of the alternator 12 has not been adjusted properly and that the battery current of a certain magnitude or more has not flowed. Return to step S31.

Next, a processing operation performed by the microcomputer 2 in the battery monitoring device 1 constituting the battery charge state calculation system according to the embodiment (1) “correction of the battery charge rate based on the charge / discharge electricity amount” (step S4 in FIG. 2). Will be described based on the flowchart shown in FIG.

First, calculation of the amount of electricity Cx charged / discharged from the battery 9 is started based on the data obtained from the current value monitor circuit 5 (step S51). The amount of electricity Cx charged / discharged from the battery 9 can be obtained by integrating (battery current value) obtained from the current value monitor circuit 5 for every certain period.

Next, it is determined whether or not a predetermined time (for example, 60 seconds) has elapsed from the start of calculation of the charge / discharge electricity amount Cx (step S52), and if it is determined that the predetermined time has elapsed, charge / discharge is performed. The calculation of the amount of electricity Cx ends (step S53), and then the charging rate for correcting the charging rate SOC of the battery 9 as shown in FIG. 13 stored in the ROM (not shown) in the microcomputer 2 A map to be used is selected from the correction map based on the battery capacity C (step S54). Therefore, if the battery capacity C is C1 or more, the upper map is selected, and if the battery capacity C is C2 or more and less than C1, the interruption map is selected, and the battery capacity C is C.
If it is less than 2, the lower map is selected.

Next, a correction value for the battery charge rate SOC is obtained based on the charge / discharge electricity amount Cx obtained by calculation using the selected map (step S55). Based on this correction value, the battery 9 The charging rate SOC is corrected (step S56). For example, the battery capacity C is C1 or more (using the upper map in FIG. 13), and the charge / discharge electricity amount Cx is 3000 [
Asec], the correction value of the charging rate is 6 points. When the battery charging rate SOC before correction is 70%, the corrected battery charging rate SOC is 76%. Conversely, if the charge / discharge electricity amount Cx is −3000 [Asec] (the discharged electricity amount is 3000 [Asec]), the charge rate correction value is −6 points, and the battery charge rate SOC after correction is 64. %.

Next, the temperature TE of the battery fluid is detected from the data obtained from the temperature sensor 15 (step S57), and the charging rate SOC of the battery 9 is corrected based on the temperature TE of the battery fluid (step S58). As shown in FIG. 7 (a), the charging rate SOC of the battery 9 has a temperature characteristic depending on the battery liquid temperature. Therefore, the battery 9 is charged using the map shown in FIG. 7 (b). The rate SOC is corrected. For example, the battery liquid temperature TE is −20 [° C.] (correction coefficient is 0.5), the battery capacity C is C1 or more (using the upper map in FIG. 13), and the charge / discharge electric energy Cx is 3000 [Asec. ], The charging rate correction value is 3 points (= 6 points × 0.5).

According to the battery charge state calculation system according to the above embodiment (1), the alternator so that the battery charge / discharge converges within the predetermined range (for example, the battery current value is within 1 [A]). The output voltage of 12 is adjusted, and the battery voltage at this time is detected as the open circuit voltage V1 of the battery. Therefore, the open circuit voltage V1 of the battery is appropriately detected.

Further, the battery charge rate SOC is obtained based on the battery open-circuit voltage V1 thus appropriately detected. Therefore, the state of charge of the battery can be obtained appropriately.
As described in the section of “Background Art”, the correlation shown in FIG. 14 is established between the open circuit voltage of the battery and the state of charge of the battery. Therefore, based on the open circuit voltage of the battery, The state of charge can be determined.

After that, since the battery charge rate SOC is corrected based on the charge / discharge electricity amount Cx, an appropriate battery charge rate SOC can always be obtained even if the battery open voltage V1 cannot be obtained. Further, if correction of the battery charge rate SOC based on the charge / discharge electricity amount Cx is continued for a long time, there is a possibility that deviation from a normal value may occur, but as shown in step S5 (FIG. 2), the charge / discharge electricity amount Cx. If the battery charge rate SOC correction process based on the above is continued for a long time, the process returns to step S2, and the battery open voltage V1 is newly obtained, and the battery charge rate SOC is obtained based on the battery open voltage V1. The above deviation can be eliminated.

(A) is the block diagram which showed roughly the principal part of the battery charge condition calculation system which concerns on embodiment (1) of this invention, (b), (c) is the figure which showed the buffer memory. . It is the flowchart which showed the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on embodiment (1) performs. It is a timing chart for demonstrating the timing of the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on Embodiment (1) performs. It is a timing chart for demonstrating the timing of the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on Embodiment (1) performs. It is the flowchart which showed the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on embodiment (1) performs. It is the figure which showed the map for calculating | requiring a battery charging rate based on the open circuit voltage of a battery. (A) is the figure which showed the temperature characteristic by the battery liquid temperature of a battery charging rate, (b) is the figure which showed the map for calculating | requiring the correction coefficient of a battery charging rate based on battery liquid temperature. It is the figure which showed the map for calculating | requiring the correction value of the output voltage of the alternator suitable for converging a battery current. It is the flowchart which showed the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on embodiment (1) performs. It is a timing chart for demonstrating the timing of the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on Embodiment (1) performs. It is the figure which showed the map for calculating | requiring the correction value of the output voltage of an alternator suitable for allowing the battery current more than a certain magnitude | size to flow. It is the flowchart which showed the processing operation which the microcomputer in the battery monitoring apparatus which comprises the battery charge condition calculation system which concerns on embodiment (1) performs. It is the figure which showed the map for correct | amending a battery charge rate based on charging / discharging electricity amount. It is the figure which showed the relationship between the open circuit voltage of a battery, and a battery charging rate. It is explanatory drawing for demonstrating the state in which charging and discharge of a battery are continued.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery monitoring apparatus 2 Microcomputer 9 Battery 12 Alternator 15 Temperature sensor

Claims (22)

In the battery charge state calculation system for calculating the charge state of the battery constituting the power supply system in combination with the generator,
Battery charge / discharge convergence generator output voltage adjusting means for adjusting the output voltage of the generator so that the battery charge / discharge converges within a predetermined range;
Battery open voltage detection means for detecting a battery voltage in a state where the battery charge / discharge converges within the predetermined range as an open voltage of the battery;
A battery charge state calculation system comprising battery charge state calculation means for calculating a charge state of the battery based on the open circuit voltage of the battery detected by the battery open voltage detection means. 2. The battery charge state calculation according to claim 1, wherein the battery charge / discharge convergence generator output voltage adjustment means adjusts the output voltage of the generator so as to be equal to the battery voltage value. system. After completing the engine start, so that it becomes the same value as the battery voltage value after a predetermined time has passed,
The battery charge state calculation system according to claim 2, wherein the battery charge / discharge convergence generator output voltage adjusting means adjusts the output voltage of the generator. The battery charge / discharge convergence generator output voltage adjusting means roughly adjusts the output voltage of the generator so as to be the same value as the battery voltage value,
4. The battery charging according to claim 2, wherein the battery charging / discharging is converged within the predetermined range by finely adjusting the output voltage of the generator based on a battery current value. State calculation system. The battery charge / discharge convergence generator output voltage adjustment means finely adjusts the output voltage of the generator based on the battery current value and the battery capacity expressed by the amount of electricity charged / discharged when the voltage fluctuates in a certain magnitude. The battery charge state calculation system according to claim 4, wherein the battery charge state calculation system is a device. A plurality of open-circuit voltage data storage means for storing data indicating the open-circuit voltage of the battery detected by the battery open-circuit voltage detection means;
Open voltage data storage means for storing data indicating the open voltage of the battery in the open voltage data storage means,
2. The battery state of charge calculation means for calculating the state of charge of the battery based on the open circuit voltage of the battery indicated by the data stored in the plurality of open circuit voltage data storage means. The battery charge state calculation system according to any one of? 7. The battery state of charge calculation means calculates the state of charge of the battery using a map showing the relationship between the open circuit voltage of the battery and the state of charge of the battery. The battery charge state calculation system according to any one of the above. 8. The battery charge state calculation system according to claim 7, wherein the map used for calculation of the state of charge of the battery is determined based on the temperature of the electrolyte solution constituting the battery. 8. The map used for calculating the state of charge of the battery is determined based on the battery capacity expressed by the amount of electricity charged / discharged when the voltage fluctuates in a certain magnitude. Or the battery charge condition calculation system of Claim 8. 10. The battery charge according to claim 5, further comprising battery capacity calculation means for calculating the battery capacity based on a change amount of the battery voltage with respect to a certain amount of charge and / or discharge. State calculation system. 11. The battery charge state calculation system according to claim 10, further comprising a battery charge / discharge generator output voltage adjustment means for adjusting an output voltage of the generator so that a battery current of a certain magnitude or more flows. . The battery charge / discharge generator output voltage adjusting means adjusts the output voltage of the generator based on whether the battery is being charged, discharged, or whether the battery is fully charged. The battery charge state calculation system according to claim 11, wherein the direction for adjustment is determined. The battery charging / discharging generator output voltage adjusting means is based on the magnitude of the battery current,
The battery charge state calculation system according to claim 12, wherein an increase / decrease value of an output voltage of the generator is determined. 14. The battery charge / discharge generator output voltage adjusting means corrects an increase / decrease value of the output voltage of the generator based on the battery capacity. The battery charge state calculation system described in 1. When the amount of charge / discharge electricity equal to or greater than a predetermined value is not detected even after a predetermined time has elapsed since the output voltage of the generator has been adjusted by the battery charge / discharge generator output voltage adjusting means,
The battery charge state calculation system according to any one of claims 11 to 14, wherein an output voltage of the generator is adjusted again. A plurality of voltage change data storage means for storing data indicating a change amount of the battery voltage with respect to the charge and / or discharge of the certain magnitude;
Voltage change amount storage means for storing data indicating the change amount in the voltage change amount data storage means,
16. The battery capacity calculation means according to claim 10, wherein the battery capacity calculation means calculates the battery capacity based on the change amount indicated by data stored in the plurality of voltage change amount storage means. The battery charge state calculation system according to any one of the items. Battery capacity comparison means for comparing the battery capacity used in a certain calculation process with the battery capacity calculated by the battery capacity calculation means;
The battery capacity used in the certain calculation process is configured to be updated to the one calculated by the battery capacity calculation means based on the comparison result by the battery capacity comparison means. Item 17. The battery charge state calculation system according to any one of Items 10 to 16. Charge / discharge electricity calculation means for calculating charge / discharge electricity by integrating battery current values;
Battery charge state correction means for correcting the charge state of the battery calculated by the battery charge state calculation means based on the charge / discharge electricity amount calculated by the charge / discharge electricity amount calculation means; The battery charge state calculation system according to any one of claims 1 to 17. The battery charge state correction means calculates the charge of the battery calculated by the battery charge state calculation means based on the charge / discharge electricity amount calculated by the charge / discharge electricity amount calculation means and the temperature of the electrolyte constituting the battery. 2. The state is corrected.
The battery charge state calculation system according to claim 8. When the correction process by the battery charge state correction means exceeds a certain limit,
The battery charge state calculation system according to claim 18 or 19, wherein the battery state of charge to be corrected is updated. In a battery charge state calculation method for calculating a charge state of a battery constituting a power supply system in combination with a generator,
Adjust the output voltage of the generator so that the battery charge / discharge converges within a predetermined range,
The battery voltage in a state where the battery charge / discharge converges within the predetermined range is detected as the open voltage of the battery,
A battery charge state calculation method, comprising: calculating a charge state of a battery based on a detected open circuit voltage of the battery. A battery monitoring device comprising a computer that executes the battery charge state calculation method according to claim 21.

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