JP2007265693A - Apparatus and method for battery control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery control apparatus and a battery control method that can correctly determine whether a battery has been deteriorated or not. <P>SOLUTION: Upon detection of an integration value of current or the like that is comparable to a battery state, when a charged quantity of electricity is judged to be greater than a predetermined value, a CPU calculates a difference between a voltage value of the predetermined value and a voltage value for the charged quantity of electricity on a theoretical curve. The CPU as a determining section determines battery deterioration when the difference has a predetermined value or greater, or when a voltage value that is an actual measurement value in a charged quantity of electricity is estranged from a theoretical voltage value on the theoretical curve for a charged quantity of electricity of a predetermined value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery control device and a battery control method for accurately determining battery deterioration.

  With the increase in vehicle electrical components, the roles of the power feeding system, that is, the generator and the battery are increasing. However, when the situation where the battery is used in an intermediate state of charge that does not reach a fully charged state continues, the internal substance solidifies, and the absolute capacity of the battery decreases. This phenomenon is called “sulfation”. This reduces the life of the battery.

  Various techniques for determining battery deterioration have been proposed and put into practical use (see, for example, Patent Document 1). In the technique of Patent Document 1, when the discharge current of the battery is increasing during acceleration of the electric vehicle, by comparing the discharge current and discharge voltage of the battery with the intended battery discharge current and discharge voltage, Battery deterioration is judged.

JP-A-6-59003

  In the prior art, when the discharge current of the battery is not increasing, for example, when the discharge current of the battery is constant, the deterioration of the battery cannot be measured, and the current battery charge state cannot be accurately obtained. Since the battery deterioration state is estimated from the so-called VI characteristics, which are the characteristics of the discharge current and discharge voltage before and after engine start, how much charging current to the battery detected by the battery sensor is stored in the battery. I ca n’t figure out exactly.

  An object of the present invention is to provide a battery control device and a battery control method that can accurately determine whether or not a battery has deteriorated.

  According to the present invention (1), the determination unit determines whether the battery has deteriorated based on the relationship between the battery voltage value and electrolyte temperature at the time of battery deterioration determination and the current integrated value acquired by the current integrated value acquisition unit. Determine. That is, a battery voltage value (referred to as a first voltage value) corresponding to a certain current integrated value is obtained. The current integration is continued and the battery voltage value (referred to as the second voltage value) when the current integration value is reached again is obtained. Here, since the charging efficiency is deteriorated when the battery is deteriorated, the voltage value of the battery when the battery is charged does not increase so much as compared with the battery which is not deteriorated. Therefore, the determination unit determines that the battery is deteriorated when the first voltage value is larger than the second voltage value.

  According to the present invention (1), the first voltage value and the second voltage value after continuing the current integration are obtained, and when the first voltage value is larger than the second voltage value, the determination unit It is determined that the battery has deteriorated. When the first voltage value is equal to the second voltage value, the determination unit determines that the battery is not deteriorated and is normal. It is possible to accurately and easily determine whether or not the charging current for the battery is stored in the battery. It is possible to reliably determine the deterioration of the battery during one trip, which is one step from the state where the engine is driven to the state where the engine is stopped.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. Portions corresponding to the matters described in the preceding forms in each embodiment are denoted by the same reference numerals, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder. The battery control device according to the present embodiment is mounted on a vehicle. The following description also includes a description of the battery control method.

FIG. 1 is a block diagram showing an electrical configuration of the battery control apparatus according to the first embodiment of the present invention. The vehicle 1 includes an engine 2, an engine starter 3, an AC generator 4, a battery 5, an ammeter 6 as a detection unit, a voltmeter 7 that measures the voltage value of the battery 5, and a temperature that measures the electrolyte temperature of the battery 5. A total of 8, a first battery control device 9 and a navigation device 10 are included. The first battery control device 9 includes an electronic control unit (abbreviated as ECU: Electronic).
Control Unit).

  The first battery control device 9 includes a battery state detection unit 11, a battery deterioration determination unit 12, a battery current integrated value acquisition unit 13, and a storage unit 14. The battery state detection unit 11 detects the current value, voltage value, and electrolyte temperature of the battery 5 from the signals from the ammeter 6, the voltmeter 7, and the thermometer 8. The battery state detection unit 11 includes a central processing unit 11 (abbreviated as CPU: Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an A / D (Analog-to-digital). Includes a converter. A navigation device 10 that acquires position information of the vehicle 1 is electrically connected to an input / output interface (not shown) of the ECU.

  The analog data of the voltage value measured by the voltmeter 7 is converted into digital data by the A / D converter and temporarily stored in the RAM. The CPU calculates, that is, acquires the voltage value of the battery 5 based on the temporarily stored digital data. The analog data of the current value measured by the ammeter 6 is converted into digital data by the A / D converter, and is temporarily stored in the RAM in association with the digital data of the voltage value at the same time. The CPU calculates, that is, acquires a current value based on the temporarily stored digital data. Analog data measured by the thermometer 8 is converted into digital data by the A / D converter, and is temporarily stored in the RAM in association with the digital data of the voltage value and current value at the same time. The CPU calculates or acquires the electrolyte temperature based on the temporarily stored digital data.

  The ROM stores a calculation program for acquiring the integrated current value received from the detection unit. The CPU also has a function as a determination unit that determines deterioration of the battery 5. The determination program is stored in the ROM and can be executed under the conditions described later. The storage unit 14 stores in advance a theoretical value that is a theoretical curve L <b> 1 (see FIG. 3) between the amount of charge charged in the battery 5 and the voltage value of the battery 5. The theoretical curve L1 is the theoretical curve L1 of the battery 5 at the time of new shipment, and is a correlation between the amount of electricity charged in the battery 5 and the voltage value.

  FIG. 2 is a flowchart showing the battery control method according to the first embodiment step by step. This will be described with reference to FIG. When the user of the vehicle 1 switches the ignition switch of the vehicle 1 from off to on, the processing is started. After the start of this process, the process proceeds to step a1, and the CPU starts the engine 2 and starts a determination program for determining the deterioration of the battery, in other words, determining whether or not the charging capacity of the battery is reduced.

  Next, the process proceeds to step a2, and the CPU obtains the voltage value, electrolyte temperature, and current integrated value of the battery 5 in the current battery state in order to determine the deterioration of the battery 5. In step a3, the CPU as the current integrated value acquisition unit 13 charges the battery 5 in order to obtain the relationship between the voltage value of the battery 5 and the electrolyte solution temperature at the time of determining the deterioration of the battery 5 and the current integrated value. It is determined whether or not the amount of charged electricity is a predetermined value (for example, 0.5 A · h) or more. If it is determined that the value is equal to or greater than the predetermined value, the process proceeds to step a4, and if it is determined not, the process proceeds to step a5.

  In step a5, the CPU cannot obtain an amount of charge equal to or greater than a predetermined value when a predetermined elapsed time has been reached since the start of the engine, using a real time clock (abbreviated as RTC) (not shown) incorporated in the microcomputer. In this case, it is determined whether or not a predetermined time (for example, 0.5 hours) has elapsed since the engine was started. When the navigation device 10 is mounted as in the vehicle 1 according to the present embodiment, the time “0....” Obtained by multiplying the required time Tm to the destination obtained by the navigation device 10 by “0.5”. “5 × Tm” may be regarded as the predetermined time. If the determination is “NO”, the process returns to step a2. If it is determined that the predetermined time has elapsed, the process proceeds to step a6, and the CPU detects the external environment in order to more accurately determine the battery deterioration state and determine whether or not forced charging is possible.

  That is, the CPU acquires the road information of the route to the destination by the navigation device 10 and the road information such as the uphill / downhill road, the curve, the traffic jam, and the travel area. For example, forcibly charging the battery 5 in an external environment where the vehicle can travel on a flat straight road without a gradient at a constant speed is desirable in order to minimize the influence on drivability (so-called drivability). The CPU obtains position information closer to such an ideal external environment from the acquired road information. The road information to be acquired is not necessarily limited to climbing slopes, curves, traffic jams, and travel areas. However, the more road information to be acquired, the higher the accuracy of the deterioration state of the battery 5 can be improved.

  Next, the process proceeds to step a7, and the CPU detects vehicle status information (sometimes referred to as vehicle information) in order to more accurately determine whether or not the battery 5 can be forcibly charged. That is, the CPU as the vehicle information detection unit detects, for example, the engine speed. A digital signal corresponding to the engine speed is output from the engine 2, and this digital signal is temporarily stored in the RAM. If the deterioration state of the battery 5 is determined under a condition where the engine speed is constant, forced charging can be performed without affecting the drivability of the battery 5 as much as possible. In the present embodiment, only the engine speed is detected as the vehicle information, but the present invention is not limited to this engine speed. For example, vehicle speed, engine oil temperature, radiator water temperature, etc. can be detected as vehicle information. As the number of detection target parameters increases, the accuracy of the deterioration state of the battery 5 can be improved.

  In step a8, in order to determine whether or not the battery 5 can be forcibly charged, the CPU can determine the deterioration state of the battery 5 from the road information acquired in step a6 and the vehicle information acquired in step a7. Determine the presence or absence. The position information has the same meaning as the “degradation determination feasible point” described in step a8 in FIG. If it is determined that there is a deterioration determination feasible point, the process returns to step a2 so as not to forcibly charge the battery 5. However, the CPU changes the predetermined time determination value from the engine start in step a5. When the navigation apparatus 10 is mounted like the vehicle 1 according to the present embodiment, the estimated required time from the current location of the vehicle 1 to the feasible point is increased. If it is determined that there is no deterioration determination feasible point, the process proceeds to step a9, and the CPU forcibly charges the battery 5.

  Next, the process proceeds to step a10, and the CPU as the current integrated value acquisition unit detects the current integrated value in the battery state in order to determine the deterioration of the battery 5 in step a12 described later. The CPU stores the detected current integrated value in the RAM or the storage unit 14. Next, the process proceeds to step a11, and the CPU as the current integrated value acquisition unit confirms whether or not the battery 5 has been discharged to some extent, so that the amount of charge charged in the battery 5 is a predetermined value (for example, 0.5A · h) It is determined whether or not the above is true. When the determination is “NO”, the process returns to step a9. If it is determined that the predetermined value is exceeded, the process proceeds to step a4. In step a4, the CPU obtains the difference between the theoretical curve, that is, the voltage value at the start of battery deterioration determination, and the voltage value when the amount of charged electricity reaches the predetermined value, so that the voltage value of the battery 5 in the battery state is obtained. And the electrolyte temperature is detected.

  Next, the process proceeds to step a12, and the CPU performs the deterioration determination of the battery 5. Here, FIG. 3 is a diagram showing the relationship between the amount of charged electricity and the voltage difference, and FIG. 4 is a diagram showing the relationship between the electrolyte temperature and the correction value. This will be described with reference to FIG. As shown in FIG. 3, in the charge amount determined to be equal to or greater than the predetermined value represented by “X1” in step a3 or step a11, the voltage value of the predetermined charge amount X1 and the theory stored in the ROM. The CPU calculates a difference δ1 from the voltage value when the amount of charge is on the curve L1. When the difference δ1 is greater than or equal to a predetermined value (when the voltage value, which is an actual measurement value in the charge electricity amount X1, deviates by 0.1 V or more from the theoretical voltage value on the theoretical curve L1 in the charge electricity amount X1, judge.

  As shown in FIG. 4, the difference δ1, which is a criterion for determining battery deterioration, and the predetermined value of the amount of charge X1 can be changed according to the electrolyte temperature. The difference δ1, the correction value which is the predetermined value, and the electrolyte temperature are in an inversely proportional relationship. Specifically, the correction value decreases as the electrolyte temperature increases, and conversely, the correction value increases as the electrolyte temperature decreases. That is, the process proceeds to a subroutine in step a12, and the CPU changes the difference δ1 corresponding to the electrolyte temperature detected in step a4 and the predetermined value. After the battery deterioration determination in step a12, the process returns.

  FIG. 5 is a diagram illustrating the relationship between the remaining required time to the target value of the vehicle 1 and the determination time. In step a5 in FIG. 2, the CPU shifts to a subroutine for changing a predetermined elapsed time from the start of the engine according to the remaining required time to the destination of the vehicle 1. There is a relation that the predetermined elapsed time becomes longer as the remaining required time to the destination becomes longer. However, the predetermined elapsed time per unit required time ΔT has a constant proportional relationship until the remaining required time reaches the middle state, but after the intermediate state, the predetermined elapsed time per unit required time ΔT has a relationship to be shortened. . The CPU changes the predetermined elapsed time having such a relationship.

  According to the first battery control device 9 described above, a current integrated value that is in a battery state is detected and then determined to be a predetermined value (for example, 0.5 A · h) or more at step a3 or step a11 in FIG. The CPU calculates a difference δ1 between the voltage value of the predetermined value (for example, 0.5 A · h) and the voltage value at the charge amount on the theoretical curve L1 in the charged amount of charge. When the difference δ1 is greater than or equal to a predetermined value, in other words, the CPU as the determination unit, in other words, the charging electricity with respect to the theoretical voltage value on the theoretical curve L1 at a predetermined amount of charging electricity (for example, 0.5 A · h). When the voltage value, which is an actually measured value in the amount (for example, 0.5 A · h) deviates by 0.1 V or more, it is determined that the battery is deteriorated. When the CPU has a theoretical voltage value on the theoretical curve L1 at a predetermined charge amount (for example, 0.5 A · h) equal to a voltage value that is an actual measurement value for the charge amount (for example, 0.5 A · h) Therefore, it is determined that the battery 5 is not deteriorated and is normal. In this way, it is possible to accurately and easily determine whether or not the charging current for the battery 5 has been stored in the battery 5. It is possible to reliably determine the deterioration of the battery 5 during one trip, which is one step from the state in which the engine 2 is driven to the drive stop state.

  The first battery control device 9 includes a storage unit 14, in which a theoretical value (so-called map) that is a theoretical curve L <b> 1 between the amount of charge charged in the battery 5 and the voltage value of the battery 5 is stored. Stored in advance. Since the battery degradation is provided for calculation by this map, the processing load on the CPU can be reduced, and the degradation of the battery 5 can be measured even when the discharge current of the battery 5 is constant.

  According to the first battery control device 9, the correction value, which is a predetermined value of the difference δ1 for performing the battery deterioration determination and the amount of charge X1, can be changed according to the electrolyte temperature. Since the CPU determines the battery deterioration after changing the difference δ1 corresponding to the electrolyte temperature detected in step a4 and the predetermined value, it can accurately determine the battery deterioration in accordance with the current battery state. .

  In step a5 of FIG. 2, the CPU uses the real-time clock to charge the battery 5 with a charging current when a predetermined amount of charge electricity cannot be obtained when the predetermined elapsed time has been reached since engine startup. It is determined that the battery 5 is not stored, and thereafter, control is performed so as to forcibly charge in step a9. Therefore, it is possible to determine the deterioration of the battery 5 in one process from engine driving to stopping.

  In step a6 of FIG. 2, the CPU acquires road information such as an uphill / downhill road, a curve, a traffic jam, and a travel area, which is road information of a route to the destination, by the navigation device 10. For example, an external environment capable of traveling on a flat straight road without a gradient at a constant speed without traffic congestion can be acquired and stored in the RAM or the storage unit 14. Using this information, it is possible to determine the deterioration state of the battery 5 in step a12 without affecting the drivability as much as possible. In step a7 in FIG. 2, the CPU can detect the engine speed and the like, and determine the deterioration state of the battery 5 under a condition where the engine speed is constant. Therefore, the deterioration state of the battery 5 can be determined without affecting the drivability as much as possible.

  In step a8 in FIG. 2, the CPU can determine whether or not forced charging is possible based on the presence / absence of a deterioration determination feasible point. In step a6 to step a8 in FIG. 2, whether or not forced charging is possible is determined, and when there is a deterioration determination executable point, the process returns to step a2 so that the battery 5 is not forcibly charged. In this way, forced charging that can hinder the operation of the vehicle 1 can be avoided as much as possible, and the drivability of the vehicle 1 can be improved. As shown in step a5 and FIG. 5 of FIG. 2, since the routine proceeds to a subroutine for changing the predetermined elapsed time from the start of the engine according to the remaining time required to reach the destination of the vehicle 1, the subsequent steps a6 to step The accuracy at the time of determining whether the battery 5 can be forcibly charged at a8 can be improved.

  FIG. 6 is a flowchart showing the battery control method according to the second embodiment step by step. However, the same step number is attached | subjected to the step same as the flowchart which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted. When the ignition switch is switched from OFF to ON, this process is started, and after the start of this process, the process proceeds to step a3 (1) after step a1 and step a2. In step a3 (1), using the voltage value, electrolyte temperature, and current integrated value of the battery 5 obtained in step a2, the CPU as the current integrated value acquisition unit determines whether or not the battery 5 has been discharged to some extent. In order to confirm, it is determined whether or not the current integrated value of the battery 5 is equal to or greater than a predetermined value.

  FIG. 7 is a diagram comparing the voltage value when the predetermined current integrated value is reached with the voltage value when the predetermined current integrated value is set next time. If the CPU determines that the integrated current value has not reached the predetermined value, the process proceeds to step a3 (2) on the assumption that the condition for accurately determining the deterioration state of the battery 5 is not satisfied. If it is determined that the current integrated value has reached the predetermined value, the process proceeds to step a3 (3), and the CPU compares the battery voltage value at the predetermined current integrated value. It is determined whether or not the predetermined value is reached (second time when the predetermined value is established). It returns with the judgment of "No".

When it is determined that the current integrated value has reached the predetermined value again, the process proceeds to step a3 (4). In step a3 (4), if the battery current integrated value is not greater than a certain predetermined electric amount (or less than a certain predetermined electric amount having a current accumulated minimum value) from the predetermined value to the next predetermined value, the CPU determines that If judged, the battery deterioration is not judged. If it is determined that the current accumulated maximum value is greater than or equal to a predetermined amount of electricity or the current accumulated minimum value is less than or equal to a predetermined amount of electricity, the process proceeds to step a4, and the voltage value and electrolyte temperature of the battery 5 in the battery state are set. To detect. Next, the process proceeds to step a12, and the CPU performs the deterioration determination of the battery 5. That is, as shown in FIG. 7, the first voltage value _VA of the battery 5 corresponding to the desired current integrated value and the second voltage value of the battery 5 corresponding to the next time when the desired current integrated value is obtained. It is compared with the V _B. If there is no difference between the first voltage value V _A and the second voltage value V _B , the CPU determines that the battery 5 is normal without deterioration of the battery 5. When the battery 5 is deteriorated, the charging efficiency is deteriorated. Therefore, the battery voltage at the time of charging does not increase so much, and a difference between the first voltage value V _A and the second voltage value V _B occurs. After this deterioration determination, the process returns.

  In step a3 (2), the CPU uses the real-time clock to forcibly charge when a battery current integrated value greater than or equal to a predetermined value cannot be obtained within a predetermined elapsed time arrival time from a predetermined charge / discharge time. It is determined whether or not a predetermined time (for example, 0.5 hours) has elapsed since charging / discharging. If the determination is “NO”, the process returns to step a2. Here, FIG. 8 is a diagram showing the relationship between the remaining required time to the target value of the vehicle 1 and the determination time.

  In step a3 (2), the CPU shifts to a subroutine for changing the predetermined elapsed time from the predetermined charging / discharging time according to the remaining required time to the destination of the vehicle 1. There is a relation that the predetermined elapsed time becomes longer as the remaining required time to the destination becomes longer. However, the predetermined elapsed time per unit required time ΔT has a constant proportional relationship until the remaining required time reaches the middle state, but after the intermediate state, the predetermined elapsed time per unit required time ΔT has a relationship to be shortened. . The CPU changes the predetermined elapsed time having such a relationship. After step a3 (2), the process proceeds to step a6.

FIG. 9 is a diagram illustrating the relationship between the electrolytic solution temperature and the correction value. In step a3 (4), the CPU changes the predetermined electric quantity of the current integrated maximum value or the current integrated minimum value, which is a criterion for battery deterioration, depending on the electrolyte temperature. The higher the electrolyte temperature, the larger the correction value for the predetermined amount of electricity. FIG. 10 is a diagram illustrating the relationship between the electrolyte temperature and the correction value. As shown in FIG. 7, the battery deterioration is determined based on the comparison result between the first voltage value V _A and the second voltage value V _B at the predetermined current integrated value. It is corrected by the liquid temperature. Specifically, the correction value decreases as the electrolyte temperature increases, and conversely, the correction value increases as the electrolyte temperature decreases.

According to the second embodiment, as shown in FIG. 7, the first voltage value V _A of the battery 5 when the battery current integrated value reaches a predetermined adjustment value, and the battery current integrated value next time are the predetermined value. comparing the second voltage value V _B of the battery 5 when a cumulative value can be determined battery deterioration on the basis of the comparison result. The ROM does not need to store desired information that is the theoretical curve L1 of the amount of electricity charged in the battery 5 and the voltage value of the battery 5, and the free space of the ROM as compared with the first embodiment. Can be increased.

  Since the battery deterioration determination is not made unless the battery current integrated value is equal to or greater than a certain predetermined electric amount (or less than a certain predetermined electric amount having a current integrated minimum value) from a certain predetermined integrated value to the next predetermined integrated value next time, The battery deterioration determination is not performed unnecessarily. In other words, it is possible to determine whether or not the battery 5 should be determined for deterioration by performing the preliminary determination before the battery deterioration determination. Therefore, the processing load on the CPU can be reduced.

  The CPU can forcibly drive the alternator 4 to forcibly charge the battery 5 when a battery current integrated value greater than or equal to a predetermined value cannot be obtained at a predetermined elapsed time arrival time from a predetermined charging / discharging time. In step a12, when the CPU determines that the battery sensors are abnormal, the CPU does not perform the battery deterioration determination. This can ensure the validity of the battery deterioration determination.

  The CPU does not perform the battery deterioration determination on a predetermined trip after battery replacement. Immediately after the battery replacement, the battery 5 is in a new state (a state in which the battery 5 has not deteriorated), and it is not necessary to carry out a determination of deterioration. Therefore, the processing load on the CPU can be reduced.

  As another embodiment of the present invention, at the time of battery deterioration determination, the voltage-current response is learned and stored in, for example, the RAM or the storage unit 14, and the battery voltage acquired according to the response is acquired. You may make it change a point. By dealing with the response delay of the voltage value, more accurate battery deterioration determination can be performed. The acquired battery voltage can be an average of one point or a plurality of points, or a higher value of any one of the minimum value, the maximum value, and the frequency. In addition, the present invention can be implemented in various forms without departing from the spirit of the present invention.

In the vehicle 1 in which the first battery control device 9 is mounted on the vehicle body, the first battery control device 9 acquires the current integrated value of the battery 5 received from the ammeter 6 as the detection unit. A value acquisition unit 13 and a battery deterioration determination unit 12 that determines the deterioration of the battery 5;
The battery deterioration determining unit 12 determines the deterioration of the battery 5 based on the relationship between the voltage value and the electrolyte temperature of the battery 5 at the time of determining the deterioration of the battery 5 and the current integrated value acquired by the battery current integrated value acquiring unit 13. Determine.

  Therefore, after acquiring the current integrated value that is the battery state, etc., in the amount of charge that is determined to be greater than or equal to the predetermined value (for example, 0.5 A · h) in step a3 or step a11 in FIG. The CPU calculates a difference δ1 between the voltage value of 0.5 A · h) and the voltage value at the charge amount on the theoretical curve L1. When the difference δ1 is greater than or equal to a predetermined value, in other words, the CPU as the battery deterioration determination unit 12 is different from the theoretical voltage value on the theoretical curve L1 at a predetermined amount of charge electricity (for example, 0.5 A · h). When the voltage value, which is an actually measured value in the amount of charged electricity (for example, 0.5 A · h) deviates by 0.1 V or more, it is determined that the battery is deteriorated. When the CPU has a theoretical voltage value on the theoretical curve L1 at a predetermined charge amount (for example, 0.5 A · h) equal to a voltage value that is an actual measurement value for the charge amount (eg, 0.5 A · h) Therefore, it is determined that the battery 5 is not deteriorated and is normal.

  Thus, the vehicle 1 that can accurately and easily determine whether or not the charging current to the battery 5 is stored in the battery 5 can be realized. The vehicle 1 that can reliably determine the deterioration of the battery 5 during one trip, which is one step from the state in which the engine 2 is driven to the drive stop state, can be realized.

It is a block diagram showing the electric constitution of the battery control apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart showing the battery control method which concerns on 1st Embodiment in steps. It is a figure showing the relationship between charge electric quantity and a voltage difference. It is a figure showing the relationship between electrolyte solution temperature and a correction value. It is a figure showing the relationship between the remaining required time to the target value of the said vehicle 1, and determination time. It is a flowchart showing the battery control method which concerns on 2nd Embodiment in steps. It is a figure which compares the voltage value when it becomes a predetermined current integration value, and the voltage value when it becomes the said predetermined current integration value next time. It is a figure showing the relationship between the remaining required time to the target value of the said vehicle 1, and determination time. It is a figure showing the relationship between electrolyte solution temperature and a correction value. It is a figure showing the relationship between electrolyte solution temperature and a correction value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Engine starter 4 Alternator 5 Battery 6 Ammeter 7 Voltmeter 8 Thermometer 9 First battery control device 11 Battery state detection part 12 Battery deterioration determination part 13 Battery current integrated value acquisition part 14 Storage part

Claims (6)

A current integrated value acquisition unit that acquires the current integrated value of the battery received from the detection unit; and a determination unit that determines battery deterioration;
The determination unit
A battery control device that determines battery deterioration based on a relationship between a battery voltage value and an electrolyte temperature at the time of battery deterioration determination, and a current integrated value acquired by a current integrated value acquisition unit. A storage unit that stores a theoretical value of the amount of electricity to be charged in the battery and the voltage value of the battery;
The determination unit
Determining the deterioration of the battery according to the difference between the voltage value of the battery at the start of battery deterioration determination and the voltage value when the amount of charge charged to the battery determined from the integrated current value becomes a predetermined value. The battery control device according to claim 1.   The battery control device according to claim 2, wherein the determination unit changes the difference and a predetermined value according to an electrolyte temperature.   The determination unit further has a function of determining whether or not a predetermined amount of charge electricity has been reached in a state in which a predetermined time has elapsed since the start of the engine. 4. The battery control apparatus according to claim 2, wherein the battery is forcibly charged when the battery cannot be obtained. A current integrated value acquisition unit that acquires the current integrated value of the battery received from the detection unit; and a determination unit that determines battery deterioration;
The determination unit
The battery voltage value corresponding to the desired current accumulated value obtained by the current accumulated value obtaining unit and the battery voltage value corresponding to the current accumulated value obtained when the current accumulated value obtaining unit is obtained next time are obtained. A battery control device that compares and determines deterioration of a battery based on the comparison result. A current integrated value acquisition step of acquiring the current integrated value of the battery received from the detection unit, and a determination step of determining deterioration of the battery,
The determination step includes
A battery control method for determining battery deterioration based on a relationship between a battery voltage value and an electrolyte temperature at the time of battery deterioration determination, and a current integrated value acquired in a current integrated value acquisition step.

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