JP2009255742A - Battery state determination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery state determination device making determination of deterioration of the battery at a low cost. <P>SOLUTION: The battery state determination device determines the state of the battery mounted on the vehicle. The battery state determination device is provided with a starter driving state detection means and a determination means. The starter driving state detection means detects the driving state of a starter mounted on the vehicle. The determination means determines the deterioration state of the battery, based on the detection result of the driving state of the starter driving state detection means at activation of the battery state determination device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery state determination device mounted on a vehicle, and more specifically to a battery state determination device that determines a state of a battery mounted on a vehicle.

  Conventionally, a starter for starting a vehicle engine is mounted. The starter is supplied with electric power for driving from a battery mounted on the vehicle. In addition, electric power for operating the ECU (Electronic Control Unit) for controlling the operation of the engine of the vehicle and the ECU for controlling the starter relay for turning on / off the starter is also provided. , Supplied from the battery.

  Here, the starter mounted on the vehicle is an electric motor that rotates and starts an engine in a stopped state, and has a large starting current for rotating the engine. Therefore, if the battery voltage drop is large when the starter is driven, the starter may malfunction.

In order to prevent such a starter malfunction, an apparatus for determining a deterioration state of a battery has been developed. For example, as shown in FIG. 5, there is a method of monitoring the battery voltage when starting and operating the starter, and determining that the battery has deteriorated when the battery voltage falls below a threshold (for example, a patent) Reference 1). In the battery state stabilizing device disclosed in Patent Document 1, the minimum voltage value of the battery at the time of starting the engine is detected and stored, and the minimum voltage value excluding the voltage values greater than the upper limit voltage value and less than the lower limit voltage value is used. The battery deterioration state is determined.
JP 2007-280776 A

  Here, as shown in FIG. 5, when the battery voltage at the time of starting and operating the starter is lower than the minimum operating voltage (ECU reset voltage) of the ECU, the device itself for making the determination is stopped. The monitoring history may be reset. In this case, the ECU that performs the deterioration determination determines the deterioration state using the battery voltage detected after the reset. However, the ECU cannot monitor the battery voltage generated while the ECU is stopped, and the ECU stops. The battery voltage history previously stored is also erased. Therefore, the ECU determines the battery deterioration using the battery voltage detected after the reset, and cannot make a determination using the correct battery minimum voltage value. For example, in the example of FIG. 5, the correct battery minimum voltage value is the voltage Vmint, but the ECU performs battery deterioration determination using the battery minimum voltage Vminf detected after restart.

  Even if the ECU determines that the battery has deteriorated before the stop, the determination history may also disappear due to the reset.

  On the other hand, in the battery state stabilizing device disclosed in Patent Document 1, a non-volatile memory is used to hold data before the ECU is reset. However, using the non-volatile memory increases the cost. turn into.

  Therefore, an object of the present invention is to provide a battery state determination device capable of determining battery deterioration at low cost.

In order to achieve the above object, the present invention has the following features.
1st invention is a battery state determination apparatus which determines the state of the battery mounted in the vehicle. The battery state determination device includes a starter drive state detection unit and a determination unit. The starter drive state detection means detects the drive state of the starter mounted on the vehicle. The determination means determines the deterioration state of the battery based on the detection result of the drive state of the starter drive state detection means when the battery state determination device is activated.

  In a second aspect based on the first aspect, when the battery state determination device is activated, the determination means detects that the starter is driven by the starter drive state detection means. It is determined that The determination means may determine that the battery has deteriorated immediately when the starter drive state detection means detects that the starter is driven once at the time when the battery state determination device is activated. It doesn't matter. The determination unit may determine that the battery has deteriorated when the starter driving state detection unit detects that the starter is driven a plurality of times when the battery state determination device is activated. . Further, the determining means is configured such that when the starter driving state detecting means detects that the starter is continuously driven within a predetermined time when the battery state determining device is activated, the battery deteriorates. You may decide that

  According to a third aspect, in the first or second aspect, the starter drive state detection means detects an operation state of the starter motor that opens and closes a power supply line that supplies power from the battery to the motor provided in the starter. Thus, the driving state of the starter is detected. The determination means determines that the battery has deteriorated when the starter driving state detection means detects that the starter relay is in the closed state at the time when the battery state determination device is activated.

  According to a fourth invention, in the first or second invention, the battery voltage detecting means is further provided. The battery voltage detection means detects the output voltage of the battery. The determination means detects that the starter is stopped by the starter drive state detection means when the battery state determination device is activated, and the minimum output voltage of the battery detected during the period when the starter is driven If it is greater than the predetermined threshold, it is determined that the battery has not deteriorated.

  In a fifth aspect based on the first or second aspect, the starter drive state detection means obtains control data for distinguishing whether or not the starter is being driven from a control device that controls the starter drive. Based on the control data, the driving state of the starter is detected. The determination means determines that the battery has deteriorated when the starter drive state detection means detects that the starter is being driven at the time when the battery state determination device is activated.

  According to the first aspect, since it is possible to estimate whether or not the battery state determination device is stopped during the driving period based on the drive state of the starter when the battery state determination device is activated, the operating power of the battery state determination device is And the state of the battery supplying the drive power for the starter can be determined. By making such a determination, a hardware configuration that ensures that the operation guarantee voltage of the battery state determination device is always satisfied even when the battery is in a deteriorated state becomes unnecessary, and cost reduction can be expected. In addition, in the battery state determination, it is not necessary to store the information before the battery state determination device is stopped and use it after resetting. Therefore, it is not necessary to use an expensive nonvolatile memory, and cost reduction is expected. it can.

  According to the second aspect of the present invention, when the starter is driven at the time when the battery state determination device is activated, the battery state determination device can be regarded as being stopped and restarted. It can be determined that the battery that supplies the operating power of the battery state determination device has deteriorated.

  According to the third aspect, it is possible to easily detect the driving state of the starter by detecting the open / closed state of the starter relay for driving / stopping the motor provided in the starter.

  According to the fourth aspect of the invention, it is possible to determine the battery state when the battery state determination device is stopped and restarted while the starter is being driven while determining the battery state by monitoring the minimum battery voltage. These battery state determination functions can be realized at low cost.

  According to the fifth aspect, the starter drive state can be easily detected by acquiring control data from the control device that controls the starter drive.

  Hereinafter, with reference to FIG. 1, a power supply system including a battery state determination device according to an embodiment of the present invention will be described. Typically, the battery state determination device is mounted on a vehicle with a so-called idling stop mechanism that automatically stops the engine of the vehicle when the vehicle stops. For example, the idling stop mechanism automatically stops the engine when the vehicle stops due to a signal, etc., when the driver puts the gear in neutral and removes the foot from the clutch pedal. To restart. FIG. 1 is a schematic configuration diagram illustrating an example of a configuration of a power supply system including the battery state determination device.

  In FIG. 1, the power supply system including the battery state determination device includes an ECU (Electronic Control Unit) 1, a starter 2, a battery 3, and a starter switch 4. In the power supply system, the electric power stored in the battery 3 is supplied to the ECU 1 and the starter 2. In the above-described vehicle with an idling stop mechanism, the starter may be driven via a control device for starting the engine, and the control device starts / stops the engine by a driver's operation or automatically according to the state of the vehicle. However, the control device is not shown in the drawing.

  The battery 3 is a power storage device that stores power generated by an alternator (not shown) and supplies the stored power to the ECU 1 and the starter 2. As the battery 3, for example, a lead storage battery having a rated voltage of about 12V is used, but other secondary batteries (for example, nickel-metal hydride battery, lithium ion battery, etc.) may be used.

  The starter 2 is an electric motor that rotates and starts an engine in a stopped state, and is, for example, an electric load that operates at a rated voltage of about 12V. The starter 2 includes a starter relay 21 and a motor 22. The starter relay 21 is a relay for turning on / off the driving of the motor 22 and includes a coil and a main switch therein. The starter relay 21 turns on the main switch when the coil is energized (for example, energization of the S terminal of the starter 2) and connects the power supply line from the battery 3 to the motor 22 (for example, the starter relay 21). 2 between the B terminal and the M terminal). Therefore, when the starter relay 21 is turned on (that is, in a conductive state), the electric power from the battery 3 is supplied to the motor 22. That is, the motor 22 is connected to the positive terminal of the battery 3 through the starter relay 21. Further, the coil energization terminal of the starter relay 21 (for example, the S terminal of the starter 2) is connected to the positive terminal of the battery 3 through the starter switch 4. The starter relay 21 may be configured separately from the starter 2 including the motor 22.

  The starter switch 4 is closed when the vehicle engine is started, and the starter 2 is driven. For example, in the case of a vehicle with an idling stop mechanism, ON / OFF of the starter switch 4 is controlled by a control device for starting the engine.

  The ECU 1 is a control device including a CPU (Central Processing Unit), and is based on the output voltage (battery voltage) of the battery 3 and / or the state of the starter 2 when the ECU 1 is activated. Determine. For example, the ECU 1 drives the starter 2 by monitoring the input voltage of the motor 22 of the starter 2 (voltage at point A in the figure) and the input voltage of the coil energization terminal of the starter relay 21 (voltage at point B in the figure). It is determined whether or not it is in a state. Specifically, when the input voltage of the motor 22 of the starter 2 indicates a battery voltage that can drive the motor 22, the ECU 1 can determine that the starter 2 is in a driving state. When the input voltage of the motor 22 of the starter 2 indicates 0V, the ECU 1 can determine that the starter 2 is in a stopped state. Further, when the input voltage at the coil energization terminal of the starter relay 21 indicates a battery voltage at which the main switch of the starter relay 21 can be turned on, the ECU 1 can determine that the starter 2 is in a driving state. When the input voltage at the coil energization terminal of the starter relay 21 is 0 V, the ECU 1 can determine that the starter 2 is in a stopped state.

  Then, the ECU 1 determines the deterioration state of the battery 3 based on whether or not the starter 2 is in a driving state when the ECU 1 is activated. Further, the ECU 1 monitors the minimum battery voltage when starting the engine, and determines the deterioration state of the battery 3 based on whether or not the minimum battery voltage is equal to or less than a threshold value. The function of detecting the battery voltage may be built in the ECU 1 or may be provided separately from the ECU 1. The ECU 1 corresponds to an example of the battery state determination device of the present invention.

  Next, the operation of the battery state determination device will be described with reference to FIGS. FIG. 2 is a timing chart showing an example of the battery deterioration determination operation in a state where the ECU 1 is not reset. FIG. 3 is a timing chart showing an example of the battery deterioration determination operation in a state where the ECU 1 is reset. FIG. 4 is a flowchart illustrating an example of the battery deterioration determination operation of the ECU 1.

  In FIG. 2, when the vehicle driver turns on the ignition (IG) by pressing the engine switch after the key operation or the electronic key is collated, the ECU 1 is also activated to start operation (illustration). Arrow C). Then, the starter 2 is driven (starter relay 21 is turned on) by the operation of the driver of the vehicle or the control of the engine starting control device, and the cranking of the engine is started (time point D in the figure). Thereafter, the starter 2 is stopped (the starter relay 21 is OFF) by the operation of the driver of the vehicle or the control of the control device for starting the engine, and the cranking of the engine is ended (time point E in the drawing).

  In the cranking period (the period from the time point D to the time point E in the figure), the motor 22 that drives the engine in a stopped state is started and driven, and has a large starting current to rotate the engine. A descent occurs. In the example shown in FIG. 2, the battery voltage during the cranking period maintains a level higher than the voltage at which the ECU 1 stops operating (ECU reset voltage), but the threshold value for determining that the battery 3 is deteriorated. An example is shown in which the voltage drops to a lower level (battery minimum voltage Vmin). In this case, the ECU 1 determines that the battery 3 has deteriorated based on the minimum battery voltage Vmin being equal to or lower than the threshold value.

  In FIG. 3, as in FIG. 2 described above, the ECU 1 is also activated when the vehicle is in an ignition (IG) ON state by pressing the engine switch after the vehicle driver has collated the key operation or electronic key. The operation is started (arrow F in the figure). Then, the starter 2 is driven (the starter relay 21 is turned on) by the operation of the driver of the vehicle or the control of the engine starting control device, and the cranking of the engine is started (time point G in the drawing). Thereafter, the starter 2 is stopped (the starter relay 21 is turned off) by the operation of the driver of the vehicle or the control of the control device for starting the engine, and the cranking of the engine is ended (time point J in the figure).

  However, in the example shown in FIG. 3, since the battery voltage in the cranking period has dropped to a level lower than the ECU reset voltage, the ECU 1 is stopped and restarted during the cranking period. . Specifically, the ECU 1 stops when the battery voltage drops to a level lower than the ECU reset voltage (time point H in the figure). Then, when the battery voltage rises to a voltage at which the ECU 1 can be restarted (illustration time I), the ECU 1 is restarted in a reset state. The ECU 1 detects that the starter 2 is in a driving state when the ECU 1 is restarted, so that the ECU 1 can be regarded as having been stopped and reset due to a voltage drop of the battery voltage during the cranking period. . Therefore, the ECU 1 determines that the battery 3 has deteriorated when the starter 2 is in a driving state (indicated by the arrow K in the drawing) at the time of restart (that is, the illustrated time point I).

  Next, an example of the battery deterioration determination operation of the ECU 1 will be described with reference to FIG. In FIG. 4, the ECU 1 determines whether or not the starter 2 is in a driving state when the ECU 1 is started (step S51). For example, in the ECU 1, the input voltage of the motor 22 of the starter 2 (voltage at point A in FIG. 1) and the input voltage at the coil energization terminal of the starter relay 21 (voltage at point B in FIG. 1) drive the starter 2. It is determined whether or not the starter 2 is in a driving state. Then, when the starter 2 is in a stopped state, the ECU 1 proceeds to the next step S52. On the other hand, when the starter 2 is in a driving state, the ECU 1 proceeds to the next step S60. In addition, when the operation of the ECU 1 is stopped and the ECU 1 is restarted during the operation of each step, which will be described later, due to the voltage drop of the battery voltage described above, the operation is started from the step S51 when the ECU 1 is restarted. And

  In step S52, the ECU 1 determines whether or not the drive of the starter 2 has been started. In addition, since the drive determination method of the starter 2 performed by the ECU 1 is the same as that in step S51, detailed description thereof is omitted. Then, when the drive of the starter 2 is started, the ECU 1 advances the processing to the next step S53. On the other hand, when the starter 2 is stopped, the ECU 1 proceeds to the next step S62.

  In step S53, the ECU 1 initializes the minimum voltage Vmin stored in a predetermined memory, and proceeds to the next step. For example, the ECU 1 initializes the minimum voltage Vmin to a voltage (for example, 12 V) that is higher than a threshold that will be described later.

  Next, the ECU 1 detects the output voltage (battery voltage V) of the battery 3 (step S54), and determines whether or not the detected battery voltage V is smaller than the minimum voltage Vmin stored in the memory (step S54). S55). When the detected battery voltage V is smaller than the minimum voltage Vmin stored in the memory, the ECU 1 updates the minimum voltage Vmin stored in the memory using the battery voltage V detected in step S54. (Step S56), the process proceeds to the next step S57. On the other hand, when the detected battery voltage V is equal to or higher than the minimum voltage Vmin stored in the memory, the ECU 1 proceeds to the next step S57 as it is.

  In step S57, it is determined whether or not the starter 2 has been driven. In addition, since the drive determination method of the starter 2 performed by the ECU 1 is the same as that in step S51, detailed description thereof is omitted. When the starter 2 continues to be driven, the ECU 1 returns to step S54 and repeats the process. On the other hand, when the starter 2 has been driven, the ECU 1 proceeds to the next step S58.

  In step S58, the ECU 1 determines whether or not the minimum voltage Vmin stored in the memory is equal to or lower than a threshold value set in advance to determine the deterioration of the battery 3. If the minimum voltage Vmin is greater than the threshold value, the ECU 1 proceeds to the next step S59. On the other hand, when the minimum voltage Vmin is equal to or lower than the threshold, the ECU 1 proceeds to the next step S60. The threshold used in step S58 is a value for determining whether the battery 3 has deteriorated using the lowest battery voltage. The specifications of the battery 3, the specifications of the starter 2, the specifications of the electric load mounted on the vehicle, and the like. Based on the above, it may be set as appropriate according to the vehicle to be mounted.

  In step S59, the ECU 1 determines that the battery 3 has not deteriorated, and returns to step S52 to repeat the process. Here, the condition for executing step S59 is not the state in which the starter 2 is driven when the ECU 1 is activated (No in step S51), and the battery voltage during the period in which the starter 2 is driven is greater than the threshold value. If this is the case (No in step S58), it is determined that the battery 3 has not deteriorated.

  On the other hand, in step S60, the ECU 1 determines that the battery 3 has deteriorated, and proceeds to the next step. Here, the condition for executing step S60 is that the starter 2 is driven when the ECU 1 is activated (Yes in step S51; arrow K in FIG. 3), or in the period during which the starter 2 is driven. This is a case where the battery voltage is equal to or lower than the threshold value (Yes in step S58; time point E in FIG. 2), and it is determined that the battery 3 has deteriorated when such a condition is satisfied.

  Next, the ECU 1 performs battery deterioration processing (step S61), returns to step S52, and repeats the processing. The battery deterioration process is a process performed when the battery 3 is deteriorated. As a first example, the ECU 1 prohibits automatic engine stop by an idling stop mechanism. As a second example, the ECU 1 reduces the amount of power consumed by the large power load, for example, by reducing the assist force of the actuator of the electric power steering mechanism. As a third example, the ECU 1 displays a warning indicating that the battery 3 has deteriorated on a display device provided in the vehicle, or notifies that the battery 3 has deteriorated from a speaker provided in the vehicle. Output warning sound.

  When it is determined in the process of step S52 that the starter 2 is stopped, the ECU 1 determines whether or not to end the battery deterioration determination process (step S62). For example, the ECU 1 determines that the battery deterioration determination process is ended when the driver of the vehicle performs an operation (for example, an operation of turning off the ignition switch) to end the battery deterioration determination process. Then, when continuing the battery deterioration determination process, the ECU 1 returns to step S52 and repeats the process. On the other hand, ECU1 complete | finishes the process by the said flowchart, when complete | finishing a battery deterioration determination process.

  As described above, when the starter 2 is being driven at the time of startup, the ECU 1 determines that the ECU 1 has been reset and determines that the battery 3 has deteriorated. In other words, even if the battery 3 is in a deteriorated state, a hardware configuration that ensures that the operation guarantee voltage of the ECU 1 is always satisfied is unnecessary, and cost reduction can be expected. Further, in the deterioration determination of the battery 3, since it is not necessary to store information before the ECU 1 is reset and use it after the reset, it is not necessary to use an expensive nonvolatile memory, and cost reduction can be expected. . That is, the ECU 1 can also determine the battery state when the ECU 1 is reset while determining the battery state by monitoring the conventional battery minimum voltage, and realizes these battery state determination functions at low cost. can do.

  In the above-described embodiment, an example in which the battery state determination device is mounted on a vehicle with an idling stop mechanism is used as a typical example. However, the battery state determination device of the present invention is mounted on a vehicle having another specification. It doesn't matter. For example, the battery state determination device of the present invention may be mounted on a general vehicle that can start / stop the engine only by key operation of the driver of the vehicle. In this case, when the starter 2 is in the driving state by the driver's key operation when the ECU 1 is activated, the ECU 3 may be regarded as being reset and the battery 3 may be determined to be deteriorated.

  In the above-described embodiment, the starter 2 is monitored by monitoring the input voltage (voltage at point A in the figure) of the starter 2 and the input voltage (voltage at point B in the figure) of the coil energization terminal of the starter relay 21. Although the example in which the driving state 2 is determined is used, the driving state of the starter 2 may be determined by another method. For example, the ECU 1 acquires control data that can distinguish whether or not the engine is being started (that is, the starter is being driven) from a control device for engine start that is mounted on a vehicle with an idling stop mechanism. Based on this, the driving state of the starter 2 may be determined. Further, when the vehicle is a general vehicle that can start / stop the engine only by the key operation described above, the ECU 1 acquires key data indicating the key position in the key operation, and the key data drives the starter. It is also possible to determine the driving state of the starter 2 based on whether or not

  Further, in the battery deterioration determination process described above, the deterioration determination of the battery 3 by monitoring the battery minimum voltage is performed at the end of driving of the starter 2, but the deterioration determination may be performed at other timings. . For example, the presence or absence of deterioration of the battery 3 may be determined by comparing the minimum voltage Vmin with a threshold value at a timing when a predetermined time has elapsed after the starter 2 is driven. In the present invention, the deterioration determination of the battery 3 by monitoring the battery minimum voltage is performed from the time when the starter 2 is driven to the time when the next drive of the starter 2 is started or until the battery deterioration determination process is ended. It goes without saying that the same deterioration determination can be made if it is performed up to this point.

  Furthermore, in the battery deterioration determination process described above, when determining the deterioration of the battery 3 using the battery minimum voltage, only the minimum voltage Vmin during the period in which the battery 3 is driven is stored and compared with the threshold value. However, the battery voltage history other than the minimum voltage Vmin may be stored to determine the deterioration. For example, all battery voltage histories detected during the period in which the battery 3 is driven may be stored, and the deterioration of the battery 3 may be determined based on a comparison between the history and the threshold value.

  Further, the ECU 1 may have other control functions. For example, the ECU 1 may be a control device included in the engine control computer as a function of the engine control computer. Here, the engine control computer is a control device that performs engine control of the vehicle, and is, for example, an electronic control device (engine ECU) that controls the fuel injection amount and ignition timing of the engine. The battery state determination device of the present invention can be incorporated as one function of various control devices (ECUs) provided in the vehicle.

  In the battery deterioration determination process described above, if the starter 2 is driven even once when the ECU 1 is activated, it is determined that the ECU 3 is reset and the battery 3 is determined to be deteriorated. The deterioration determination of the battery 3 may be performed according to other determination criteria. For example, it may be determined that the battery 3 has deteriorated when the number of times that the starter 2 is driven when the ECU 1 is activated reaches a predetermined number of times. Further, it may be determined that the battery 3 has deteriorated when the phenomenon in which the starter 2 is driven when the ECU 1 is started continuously occurs within a predetermined time.

  Further, it is needless to say that the above-described voltages and the like are merely examples, and the present invention can be realized with other voltages. In the above description, power supply with a rated voltage of about 12 V is assumed. However, the present invention is similarly applied to a power supply system that supplies power with a rated voltage of about 24 V used in large vehicles, for example. Needless to say, you can.

  Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in all respects and is not intended to limit the scope thereof. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention.

  The battery state determination apparatus according to the present invention can realize determination of battery deterioration at low cost, and can be applied to an apparatus for determining the state of a battery mounted on a vehicle.

1 is a schematic configuration diagram illustrating an example of a configuration of a power supply system including a battery state determination device according to an embodiment of the present invention. FIG. 1 is a timing chart illustrating an example of a battery deterioration determination operation in a state in which the ECU 1 is not reset. FIG. 1 is a timing chart illustrating an example of a battery deterioration determination operation in a state where the ECU 1 in FIG. 1 is reset. The flowchart which shows an example of the battery deterioration determination operation | movement of ECU1 of FIG. Timing chart showing an example of conventional battery deterioration determination operation

Explanation of symbols

1 ... ECU
2 ... Starter 21 ... Starter relay 22 ... Motor 3 ... Battery 4 ... Starter switch

Claims (5)

A battery state determination device for determining a state of a battery mounted on a vehicle,
Starter driving state detecting means for detecting a driving state of a starter mounted on the vehicle;
A battery state determination device, comprising: a determination unit that determines a deterioration state of the battery based on a detection result of the drive state of the starter drive state detection unit when the battery state determination device is activated.   The determination means determines that the battery has deteriorated when the starter drive state detection means detects that the starter is driven at the time when the battery state determination device is activated. The battery state determination apparatus according to 1. The starter driving state detection means detects the driving state of the starter by detecting an operating state of a starter motor that opens and closes a power supply line that supplies power from the battery to a motor provided in the starter,
The determination unit determines that the battery is deteriorated when the starter driving state detection unit detects that the starter relay is in a closed state when the battery state determination device is activated. The battery state determination device according to claim 1 or 2. A battery voltage detecting means for detecting the output voltage of the battery;
The determination unit detects that the starter is stopped by the starter driving state detection unit at the time when the battery state determination device is activated, and the battery detected in a period during which the starter is driven The battery state determination device according to claim 1, wherein when the minimum output voltage is greater than a predetermined threshold value, the battery is determined not to be deteriorated. The starter drive state detection means obtains control data that can distinguish whether the starter is being driven from a control device that controls the drive of the starter, detects the drive state of the starter based on the control data,
The determination means determines that the battery is deteriorated when the starter drive state detection means detects that the starter is being driven at the time when the battery state determination device is activated. The battery state determination device according to 1 or 2.

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