JP4185875B2 - Engine starter - Google Patents

Description

  The present invention relates to an engine starting device.

  As a starter of a heat pump air conditioner with an engine, there is one that starts an engine using a storage battery like an automobile. However, there were many problems such as storage battery failure or deterioration during the off-season period. Therefore, an engine starting AC-DC power supply unit using a commercial power supply is installed to start the engine.

  There are also starters that use large capacitors to start the engine.

In addition, there exists what was described in patent document 1, for example in such an engine starting device.
JP-A-7-324667

  However, in an engine starter that uses a commercial power supply, the instantaneous inrush current when driving the starter is large, so the capacity of the general 100V power supply is insufficient, and it is necessary to draw a 200V three-phase AC power supply exclusively. There were limitations from the aspect of installation and installation location.

  In addition, in a device using a large-capacity capacitor, there is a problem that a capacitor necessary for starter driving cannot be secured with a general capacitor.

  Accordingly, it is an object of the present invention to provide an engine starter using a 100V commercial power source that is highly reliable and durable even when the rest period is long and is not subject to location restrictions.

A first aspect of the invention is an engine starter for driving a starter motor of an engine that drives a compressor of a gas heat pump air conditioner system or a generator of a cogeneration system, wherein the power supply means of the starter motor is a power storage device in which a plurality of cells are connected in series Means, charging means for charging the power storage means using a commercial power source, means for detecting the voltage of each cell of the power storage means, and the voltage distribution range between the plurality of cells is equal to or less than a specified value Vk Means for equalizing the voltage of each cell, and when the start switch of the system is turned on, the total voltage Vt of the power storage means is detected so that the total voltage Vt exceeds the specified value when it is below a specified value. Means for controlling the charging means and an engine when a start switch of the system is in an ON state and the total voltage Vt of the power storage means exceeds a specified value; Means for controlling the discharge to the starter motor from on to storage means the start switch of the starting circuit in order to start, the distribution range of the voltage between the plurality of cells during the suspension period of the system is greater than the specified value Vk This is composed of a means for controlling the charging means to be equal to or less than the specified value Vk,.

In this case , the means for equalizing the voltage of each cell so that the voltage distribution range of the plurality of cells is equal to or less than a specified value Vk includes a charging current bypass circuit provided in parallel to each of the plurality of cells, Means for detecting the maximum voltage Vmax and the minimum voltage Vmin among the plurality of cells and calculating the voltage difference ΔV by ΔV = Vmax−Vmin, and whether the calculated voltage difference ΔV is within the specified value Vk. A means for determining, a means for calculating the average voltage Vmean of the plurality of cells by using the total voltage Vt of the power storage means and the number n of the plurality of cells when the voltage difference ΔV is larger than the specified value Vk; Means for calculating a determination reference voltage Va using Va = Vmean + Vk / 2 using the average voltage Vmean and the specified value Vk, and detecting a cell having a voltage equal to or higher than the determination reference voltage Va among the plurality of cells. Means and a cell whose voltage is equal to or higher than a judgment reference voltage Va. The bypass circuit Te is and a voltage control means to equalize as the distribution range of the bypass to the voltage of each cell is less than the specified value Vk until a predetermined time elapses part of the charging current to the cell.

According to a second invention, in the first invention, when the start switch of the system is in an ON state and the total voltage Vt of the power storage means exceeds a specified value, the start switch of the start circuit is turned on to store the power. The means for controlling the discharge from the means to the starter motor is to stop the starter motor once the engine does not start even if the starter motor is rotated until a specified time elapses, and the total voltage Vt of the power storage means is below a specified value. Then, after the power storage means is recharged, the starter motor is started again .

According to a third invention, in the first invention or the second invention, the power storage means comprises an electric double layer capacitor .

In the first invention, even when a voltage variation occurs between the cells due to natural discharge of the power storage means during the rest period, the voltage distribution range between the cells is equal to or less than the specified value Vk by the equalization control. Therefore, the maintenance check of the power storage means can be made unnecessary. During operation of the system, when the total voltage Vt of the power storage means is less than or equal to the specified value, the power storage means is charged by the charging means, but the voltage distribution range between the cells of the power storage means is kept below the specified value Vk. Therefore, the power storage means can be efficiently charged to a total voltage exceeding the specified value. As a result, a sufficient current can be supplied from the power storage means to the starter motor even after the suspension period has elapsed .

In this case , the determination reference voltage Va is calculated by Va = Vmean + Vk / 2, and for a cell having the determination reference voltage Va or higher, the bypass circuit bypasses a part of the charging current for the cell until a predetermined time elapses. Thus, the voltage distribution range of each cell is equalized so as to be equal to or less than the specified value Vk.

In the second invention , even when the starter motor is driven for a specified time and the engine does not start and the voltage of the power storage means decreases, the power storage means is charged to supply a sufficient current to the starter motor. Can do.

In the third aspect of the invention , by using an electric double layer capacitor capable of flowing a large amount of current instantaneously to the power storage means, a sufficient current can be started from the power storage means using a 100 V commercial power source that is not limited by location or equipment. Can be supplied to the motor. Further, since the electric double layer capacitor has high durability, even if the rest period is long, there is little deterioration, and current can be supplied to the starter motor reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The present invention is used, for example, as an engine starter of the system shown in FIG. 1 or FIG.

  FIG. 1 is a block diagram of a gas heat pump air conditioner system to which the present invention is applied.

  The air conditioning system includes an outdoor unit 5 and a plurality of indoor units 6.

  The outdoor unit 5 mainly includes an engine 2, an engine starter 1 that starts the engine 2, a compressor 3 that is driven by the engine 2, and a controller 4 that controls them.

  The compressor 3 compresses the refrigerant to a high temperature and supplies it to each indoor unit 6. The refrigerant that has released heat in the indoor unit 6 is returned to the compressor 3 and compressed again. The temperature and air volume of the indoor unit 6 are set by the remote controller 7.

  FIG. 2 is a block diagram of a cogeneration system to which the present invention is applied.

  The cogeneration system mainly includes an engine 2, an engine starter 1 that starts the engine 2, a generator 8 that is driven by the engine 2, and a controller 4 that controls them.

  The generator 8 supplies the generated power to each power supply facility 11. The heat exchanger 9 uses the heat of the exhaust gas discharged from the engine 2 to boil hot water and supplies it to each hot water supply facility 10.

  FIG. 3 is a schematic configuration diagram of an engine starter 1 applied to a gas heat pump air conditioner system or a cogeneration system using the above-described engine as a driving force.

  The engine starter 1 uses a starter motor 15 that applies an initial driving force to the engine 2, an electric double layer capacitor 16 that supplies current to the starter motor 15, and charging that charges the electric double layer capacitor 16 using a 100 V commercial power source 17. It mainly comprises a charger 13, a charger controller 12 for controlling the charger 13, and a capacitor controller 40 for equalizing the voltage of the capacitor cell of the electric double layer capacitor 16.

  In addition, 18 is a start switch, 21 is a relay circuit for controlling the supply of drive current to the starter motor 15, 20 is a relay switch, and 19 is a coil.

  The electric double layer capacitor 16 includes a plurality of capacitor cells (C1 to Cn) connected in series.

  Each capacitor cell (C1 to Cn) may be composed of one capacitor, or a plurality of capacitors connected in parallel may be regarded as one capacitor cell.

  In this way, by using the electric double layer capacitor 16 capable of flowing a large-capacity current instantaneously as the power source of the starter motor 15, the electric double layer is utilized by using the 100V commercial power source 17 which is not restricted by the place and equipment. Even if the capacitor 16 is charged, a sufficient current can be supplied to the starter motor 15. Further, since the electric double layer capacitor has high durability, even if the rest period is long, the electric double layer capacitor is hardly deteriorated, and the current can be reliably supplied to the starter motor 15.

  As shown in FIG. 9, the capacitor controller 40 for equalizing the voltage of the capacitor cell of the electric double layer capacitor 16 includes a bypass circuit 50 comprising an electric current limiting resistor 41 and a bypass transistor 42, an OR circuit 43, and a comparator 44. , Bypass reference voltage generating means 45, cell voltage detection switching circuit 46, insulation amplifier 47, AD conversion circuit 48, bypass switching circuit 49, switching signal output circuit 51, data communication circuit 52, central processing unit (CPU) 53, readout A dedicated memory (ROM) 54 and a random access memory (RAM) 55 are provided.

  The comparator 44 compares the shared voltage of the capacitor cells (C1 to Cn) with a constant bypass reference voltage. When the shared voltage of the capacitor cells (C1 to Cn) becomes equal to or higher than the voltage set by the bypass reference voltage generating means 45 due to charging, a bypass command is output to prevent charging of the capacitor cell. The bypass reference voltage is set near the withstand voltage (maximum usable voltage) of the capacitor cell, for example, 2.7V.

  The bypass transistor 42 conducts the bypass circuit 50 when a base voltage is applied by the ON output of the OR circuit 43. The bypass command turns on the bypass transistor 42 via the OR circuit 43 to bypass part of the charging current of the capacitor cells (C1 to Cn). This bypass determination is made for each of the capacitor cells (C1 to Cn). In this way, the voltage of each capacitor cell (C1 to Cn) can be limited and equalized to the maximum usable voltage.

  The capacitor controller 40 includes not only a circuit that equalizes the maximum voltage but also a circuit that equalizes the voltage of the capacitor cells (C1 to Cn) with an arbitrary voltage. This will be described below.

  The cell voltage switching circuit 46 sequentially switches capacitor cells (C1 to Cn) whose voltages are read by the AD conversion circuit 48 based on a signal from the switching signal output circuit 51. A digitized voltage signal is taken into the CPU 53 from the AD conversion circuit 48. At this time, the main power supply system circuit including the capacitor cells (C1 to Cn) and the AD conversion circuit 48 are insulated by the insulation amplifier 47.

  The CPU 53 determines bypass based on the voltage of each capacitor cell (C1 to Cn) in the module. Further, the CPU 53 sends a switching signal to the bypass switching circuit 49 via the switching signal output circuit 51. Based on this switching signal, the bypass switching circuit 49 outputs a bypass command to the cell 30 that needs to be bypassed. The bypass command turns on the transistor 42 via the OR circuit 43 that takes an OR with the bypass command from the comparator 44. In this way, a bypass process is performed in which a part of the charging current of the capacitor cells (C1 to Cn) flows through the bypass circuit 50.

  By configuring the capacitor controller 40 as described above, charging is performed so that the voltage of each cell of the electric double layer capacitor 16 becomes equal during the rest period of the system.

  As a result, charging is performed for each cell so that the voltage distribution range of each cell of the electric double layer capacitor 16 is equal to or less than the specified value, and even if voltage variation occurs between the cells, the voltage of each cell Can be charged up to the maximum voltage, and a sufficient current can be supplied to the starter motor 15 more reliably.

  In addition, even when voltage variation occurs between cells due to natural discharge of the electric double layer capacitor 16 during the rest period, the voltage of each cell can be kept uniform by equalization control. Maintenance inspection of the capacitor 16 can be made unnecessary.

  The system is started by the controller 4 by first detecting the voltage of the electric double layer capacitor 16. When this voltage is less than the specified value, the electric double layer capacitor 16 is charged before the starter motor 15 is started.

  As described above, the controller 4 detects the voltage of the electric double layer capacitor 16 before starting the starter motor 15, and charges the electric double layer capacitor 16 when the voltage is equal to or lower than the specified value, thereby ensuring the starter motor. 15 can be supplied with a sufficient current.

  To start the starter motor 15, the controller 4 turns on the start switch 18 of the starting circuit and excites the first coil 19. Then, the relay switch 20 is pushed, the relay circuit 21 is closed, and the electric double layer capacitor 16 and the starter motor 15 are relayed, whereby the current of the electric double layer capacitor 16 is supplied to the starter motor 15.

  When the engine 2 is started within a specified time from the starter motor 15 being started, the engine start is completed, and the electric double layer capacitor 16 is charged and then the engine starter is stopped.

  If the engine 2 does not start within a specified time from the start of the starter motor 15, whether or not the electric double layer capacitor 16 has enough power to drive the starter motor 15 once and then drive the starter motor 15. Confirm. When no electric power remains in the electric double layer capacitor 16, the electric double layer capacitor 16 is charged and then the starter motor 15 is driven again.

  As described above, even when the starter motor is driven for a specified time, even when the engine 2 does not start and the voltage of the electric double layer capacitor 16 decreases, the electric double layer capacitor 16 is charged, so that a sufficient current can be obtained. 15 can be supplied.

  Next, a specific control routine executed by the controller 4 when starting the gas heat pump air conditioner system or the cogeneration system will be described based on the flowchart of FIG.

  First, the routine is started in step S51.

  In step S52, the operating state of the system is detected.

  In step S53, it is determined whether the system is operating or stopped. If the system is operating, the process proceeds to step S55. If the system is stopped, the process proceeds to a subroutine of step S54, where an equalization control process is performed, and charging is performed so that the voltages of the cells are equalized. The equalization control process will be described in detail later.

  In step S55, it is confirmed whether or not the system start switch is on. If the system start switch is not on, the process proceeds to step S64 and the routine is terminated.

In step S56, it is determined whether or not the total voltage of the capacitor 15 is equal to or less than a specified value.
If the total voltage is not less than the specified value, the process proceeds to step S58. If the total voltage is less than or equal to the specified value, the process proceeds to a capacitor charging control processing subroutine of step S57, and charging of the entire electric double layer capacitor 16 is started. This capacitor charge control process will be described in detail later.

  In step S58, the start switch 18 is turned on and the starter motor 15 is rotated.

  In step S59, it is determined whether or not the engine 2 has been started. If the engine 2 has been started, the process proceeds to step S60 and the engine start is completed. When the engine 2 has not been started, the process proceeds to step S62, and it is determined whether or not the starter motor 15 has been continuously rotated for a specified time. If the specified time has not elapsed, the process returns to step S59. When the specified time has elapsed, the process proceeds to a restart control processing subroutine of step S63. This restart control processing subroutine will be described in detail later.

  In step S61, the start switch 18 is turned off and the starter motor 15 is stopped.

  In step S64, the routine ends.

  Next, the subroutine of step S54 will be described with reference to FIG. Here, each cell of the electric double layer capacitor 16 is equalized, and a bypass determination process and a bypass command process are executed.

  First, in step S11, a determination reference voltage Va used when determining whether or not to perform bypass processing for each cell is determined. The determination reference voltage determination routine is shown in the flowchart of FIG.

  In step S12, when starting bypass determination of the first to nth capacitor cells (C1 to Cn), a variable i indicating the capacitor cell number is set to 1.

  When the voltage V (i) of the i-th capacitor cell is smaller than the determination reference voltage Va in step S13, the process proceeds to step S17, the bypass command output is turned off, and no bypass is performed. When the voltage V (i) of the capacitor cell is equal to or higher than the determination reference voltage Va, the process proceeds to step S14, and it is determined whether or not a predetermined time Ta has elapsed after the bypass of the i-th cell is completed. If the predetermined time Ta has elapsed, the process proceeds to step S15 to start bypassing.

  In this manner, the heat generation and power consumption of the bypass transistor 42 can be suppressed by setting the time interval for performing the bypass to a predetermined time Ta.

  If the determination is NO in step S14, bypass is not performed, the process proceeds to step S17, and the bypass command is turned off. Thereafter, in step S18, whether all the cells have been processed (that is, whether i = n) is determined. to decide.

  In step S15, on the basis of the bypass command from the bypass switching circuit 49, bypassing of the charging current of the i-th cell (Ci) is started.

  Next, in step S16, it is determined whether or not this bypass has been executed for a certain time Tb. If a certain time Tb has elapsed since the bypass started, the bypass command is turned off in step S17, and the bypass is terminated.

  If the predetermined time Tb has not elapsed in step S16, the process proceeds to step S18 to determine whether or not the processing of all cells has been completed. If the determination in step S18 is negative, the process proceeds to step S19, 1 is added to i indicating the cell number, and then the process returns to step S13 to determine whether the next (i + 1) -th cell is equal to or higher than the determination reference voltage Va. To do.

  FIG. 6 shows a bypass determination reference voltage determination routine. First, in step S21, 1 is set to the cell number i to determine the maximum voltage and the minimum voltage of the capacitor cell.

  Next, in step S22, detection processing of the minimum voltage Vmin and the maximum voltage Vmax of the capacitor cell is performed as follows.

  First, it is determined whether or not the cell voltage V (i) of the i-th capacitor cell is equal to or lower than the minimum voltage Vmin. When the voltage is equal to or lower than the minimum voltage, the minimum voltage Vmin is set as the cell voltage V (i) (that is, Vmin = V (i)). If it is not lower than the lowest voltage, it is determined whether or not the i-th cell voltage V (i) is higher than the highest voltage Vmax. When the voltage is equal to or lower than the maximum voltage, the maximum voltage Vmax is set as the cell voltage V (i) (that is, Vmax = V (i)). When i = 1, the lowest voltage Vmin and the highest voltage Vmax are both the first cell voltage V (1).

  Subsequently, in step S23, it is determined whether or not all cells have been completed. If not, the cell number i is incremented by 1 in step S24, and the process returns to step S22 to detect the lowest voltage and the highest voltage. When all the cells have been completed, a difference ΔV between the maximum voltage and the minimum voltage is calculated in step S25 (ΔV = Vmax−Vmin).

  Next, in step S26, it is determined whether or not the voltage difference ΔV is within a specified value Vk. If it is within the specified value Vk, this routine is terminated. If it is larger than the specified value Vk, the module total voltage Vt is detected in step S27, and then the module total voltage Vt is divided by the number n of capacitor cells in the electric double layer capacitor in step S28 to obtain the average cell voltage Vmean. Calculate (Vmean = Vt / n). In step S28, the average voltage Vmean of the capacitor cells may be obtained by dividing the total voltage of the capacitor power storage device detected by the hybrid ECU by the total number of capacitor cells in the capacitor power storage device.

  Next, in step S29, the cell reference voltage Va is added by adding half of the cell average voltage Vmean and the specified value Vk (Va = Vmean + Vk / 2). Thereafter, this routine is terminated.

  If the voltage difference ΔV is smaller than the specified value Vk in step S26, the routine returns.

  Next, a method for determining a capacitor cell to be corrected in the above bypass control will be described in more detail with reference to FIG. Before the bypass process is performed, the cell voltages of the capacitor cells in the module are distributed around the average voltage Vmean as shown in the lower diagram of FIG. However, in the above-described bypass processing, a charging current for a capacitor cell having a voltage higher than Vk / 2 with respect to the average voltage Vmean (that is, a cell having a voltage higher than Vmean + Vk / 2) partially passes through the bypass circuit. Flowing. Therefore, by repeatedly performing the bypass, the voltage of the cell is equalized with the passage of time during charging. Finally, as shown in the upper diagram of FIG. 7, the cell voltage variation ΔV (= Vmax−Vmin) can be maintained under a certain condition (within Vk).

  When the value of the specified value Vk is set to 0.1 V, for example, each capacitor cell can be charged to the maximum voltage almost simultaneously. Therefore, the capacitor power storage device can be used in the vicinity of the maximum voltage, and can be operated with high efficiency.

  FIG. 8 shows how voltage variations are corrected within a specified value Vk by performing correction by bypass. When the voltage of the capacitor cell reaches the determination reference voltage Va, part of the charging current starts to flow through the bypass circuit, and the increase in the voltage of the capacitor cell is suppressed.

  After a certain time Tb has elapsed, the bypass ends, and then the voltage of the capacitor cell rises with time, with the same slope as when no bypass is performed. Although the case where the bypass is performed only once is shown here, there is a case where a constant bypass time Tb and a bypass interval Ta are provided, and the variation in the shared voltage is gradually corrected.

  FIG. 10 shows the capacitor charge control processing routine of step S57.

  In step S71, charging of the electric double layer capacitor 16 is started.

  In step S72, the total voltage of the electric double layer capacitor 16 is measured, and it is determined whether or not the total voltage is equal to or greater than a specified value. If the total voltage is not equal to or higher than the specified value, the process returns to step S72 and charging is continued until the total voltage becomes equal to or higher than the specified value. If the total voltage is greater than or equal to the specified value, the process proceeds to step S73 and the charging is terminated.

  FIG. 11 shows the restart control processing routine of step S63.

  In step S81, the start switch 18 is turned off.

  In step S82, the total voltage of the electric double layer capacitor 16 is measured, and it is determined whether or not the total voltage is equal to or less than a specified value. If the total voltage is not less than the specified value, the process returns to step S82. If the total voltage is less than or equal to the specified value, the process proceeds to step S83, and the above-described capacitor charge control processing routine is executed.

  In step S84, the start switch 18 is turned on and the starter motor 15 is rotated.

  In step S85, it is determined whether the engine 2 has been started. When the engine 2 is started, the process proceeds to step S86, and the engine start is completed. When the engine 2 does not start, the process proceeds to step S87.

  In step S87, it is determined whether or not a specified time has elapsed since the start switch 18 was turned on. If the specified time has not elapsed, the process returns to step S85 and the starter motor 15 continues to rotate. If the specified time has elapsed, the process returns to step S81.

  As described above, according to the present embodiment, in the engine starter that starts the engine 2 by driving the starter motor 15, the power supply means of the starter motor 15 is the electric double layer capacitor 16 in which a plurality of cells are connected in series. And charging means 12 and 13 for charging the electric double layer capacitor 16 using the commercial power source 17, and detecting the voltage of each cell so that the voltage distribution range between the plurality of cells is below a specified value. Since the control means 40 for performing equalization control for charging each time, even if charging using the commercial power supply 17, the voltage distribution range of each cell of the electric double layer capacitor 16 is below a specified value. By charging each cell in this way, even if there is a variation in voltage between cells, the voltage of each cell can be charged up to the maximum voltage, ensuring a sufficient current. It can be supplied to the Tatamota.

  In addition, by using the electric double layer capacitor 16 that can flow a large amount of current instantaneously, even if the power storage means is charged using the 100 V commercial power source 17 that is not limited by location or facilities, the starter motor 15 is sufficient. A current can be supplied. In addition, since the electric double layer capacitor 16 has high durability, even if the rest period is long, the electric double layer capacitor 16 is less deteriorated and can reliably supply current to the starter motor 15.

  Although the present invention has been described in certain terms with regard to structural and methodological features, the means disclosed herein include preferred forms of practicing the invention, and the invention is illustrated and described. It should be understood that the invention is not limited to specific features. Accordingly, the present invention includes any forms or modifications within the scope of the claims as appropriately interpreted in accordance with the principle of equality.

  The present invention can be applied to a gas heat pump air conditioner system and a cogeneration system.

1 is a block diagram of a gas heat pump air conditioner system to which the present invention is applied. It is a block diagram of a cogeneration system to which the present invention is applied. It is a schematic block diagram of the engine starting apparatus of this invention. It is a flowchart explaining the basic routine of engine starter control of this invention. It is a flowchart explaining an equalization control process. It is a flowchart explaining the determination reference voltage determination process. It is a figure which shows the method of determining the capacitor cell correct | amended in charge bypass. It is a figure which shows a mode that the dispersion | variation in a shared voltage is corrected. It is a block diagram of a capacitor controller. It is a flowchart explaining a capacitor charge control process. It is a flowchart explaining a restart control process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine starter 2 Engine 3 Compressor 8 Generator 13 Charger 15 Starter motor 16 Electric double layer capacitor 17 100V commercial power supply C1-Cn Capacitor cell

Claims (3)

In an engine starter that drives a starter motor of an engine that drives a compressor of a gas heat pump air conditioner system or a generator of a cogeneration system, the power supply means of the starter motor includes power storage means in which a plurality of cells are connected in series, and commercial power supply. Charging means for charging the power storage means using means, means for detecting the voltage of each cell of the power storage means, and the voltage of each cell so that the voltage distribution range between the plurality of cells is equal to or less than a specified value Vk. When the system start switch is turned on, the charging means is controlled so that the total voltage Vt of the power storage means is detected and the total voltage Vt exceeds the specified value when it is less than the specified value. And the engine should be started when the system start switch is on and the total voltage Vt of the power storage means exceeds a specified value. It means for controlling the turning on the start switch of the starting circuit to discharge from the accumulator to the starter motor, which when the distribution range of the voltage between the plurality of cells during the suspension period of the system is greater than the specified value Vk is a specified value Means for controlling the charging means so as to be Vk or less, while the means for equalizing the voltage of each cell so that the voltage distribution range of the plurality of cells is not more than a specified value Vk, A charging current bypass circuit provided in parallel in each of the cells, and means for detecting the highest voltage Vmax and the lowest voltage Vmin among the plurality of cells and calculating the voltage difference ΔV by ΔV = Vmax−Vmin Means for determining whether or not the calculated voltage difference ΔV is within the specified value Vk; and when the voltage difference ΔV is greater than the specified value Vk, the average voltage Vmean of the plurality of cells is determined as the total voltage Vt of the storage means and the Using the number n of multiple cells Means for calculating, means for calculating the determination reference voltage Va by using Va = Vmean + Vk / 2 using the calculated average voltage Vmean and the specified value Vk, and the voltage of the plurality of cells is the determination reference voltage Means for detecting a cell that is equal to or higher than Va, and for each cell whose voltage is equal to or higher than a determination reference voltage Va, the voltage of each cell is bypassed until the bypass circuit bypasses a part of the charging current for the cell for a certain period of time. An engine starter comprising: voltage control means for equalizing the distribution range of the engine to be equal to or less than the specified value Vk . When the start switch of the system is on and the total voltage Vt of the power storage means exceeds a specified value, the means for turning on the start switch of the start circuit to start the engine and controlling the discharge from the power storage means to the starter motor, If the engine does not start even if the starter motor is turned until the specified time elapses, the starter motor is stopped once, and when the total voltage Vt of the power storage means is below a specified value, the power storage means is recharged. The engine starter according to claim 1, wherein the starter motor is started again . The engine starting device according to claim 1 or 2 , wherein the power storage means is constituted by an electric double layer capacitor .

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