JP2018076003A - Power supply control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit an engine from being unable to be started in the future.SOLUTION: When an engine is stopped (S101 and S102), a power supply control device estimates a charge/discharge amount due to traveling after an engine start on the basis of history information of charge/discharge amounts of a battery from a start state of an ignition switch till an OFF state, and sets a first threshold on the basis of the estimated charge/discharge amount (S104 or S109). Then, the power supply control device stops power supply to at least ones between operating lamplights and accessory apparatuses (S108 or S112) when an SOC falls down to the first threshold or below or when an SOH falls down to a prescribed threshold or below (S105 or S110).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power supply control device that controls power supply to an electric load mounted on a vehicle.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 04-096632) discloses a method of stopping power supply to an operating electric load when the remaining amount of a battery falls below a set value while the engine is stopped. It is described that the remaining amount of the battery necessary for starting the engine is secured. Here, examples of the electric load that is operating while the engine is stopped include lights such as a headlight, and accessory devices such as a car audio and a car navigation system.

Japanese Patent Laid-Open No. 04-096632

  By the way, when the travel frequency is high in a travel pattern in which the battery discharge amount after starting the engine exceeds the charge amount, such as when the travel time is relatively short and the alternator operating time is short, The remaining amount of the battery tends to gradually decrease. For this reason, if the power supply to the electric load is stopped without considering the charge / discharge amount of the battery due to running after the engine is started, the next engine start may be guaranteed but the subsequent engine may not be started. was there.

  Therefore, an object of the present invention is to provide a power supply control device that can prevent the engine from being unable to start in the future.

  For this reason, when the engine is stopped, the power supply control device determines whether the battery due to the travel after the engine starts based on the history information of the charge / discharge amount of the battery from when the ignition switch is in the start state to when it is in the OFF state. A first estimating means for estimating a charge / discharge amount; and a first power supply for stopping at least one of operating lamps and accessory devices according to the estimated charge / discharge amount and the remaining amount of the battery. Power supply stopping means.

  In addition, the power supply control device, when the ignition switch is in the accessory ON state, after the engine start based on the history information of the charge / discharge amount of the battery from the start of the ignition switch to the OFF state Second estimation means for estimating a charge / discharge amount of the battery due to traveling, and stop power supply to at least one of operating lights and accessory devices according to the estimated charge / discharge amount and the remaining amount of the battery Second power supply stopping means.

  According to the power supply control device, it is possible to prevent the engine from starting in the future.

It is a circuit diagram which shows an example of the vehicle-mounted electric circuit containing an electric power supply control apparatus. It is an internal structure figure which shows an example of the electronic controller of an electric power supply control apparatus. It is a flowchart which shows an example of the electric power supply control process which an electronic controller performs. It is a flowchart which shows an example of the electric power supply control process which an electronic controller performs. It is a flowchart which shows an example of the threshold value setting process which an electronic control apparatus performs.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of an in-vehicle electric circuit 1.

  The in-vehicle electric circuit 1 is provided in a vehicle using an engine (not shown) as a power source, and includes a battery 2, an ignition switch (hereinafter referred to as “IGNSW”) 4, an electric load 6, and power supply control. Device 10.

  The battery 2 supplies electric power to the electric load 6 by applying a predetermined voltage (for example, 12 volts). The battery 2 is charged with electric power generated by an alternator (not shown) driven by the output of the engine.

  The IGNSW 4 is operated by the driver, and is configured to be switchable between an OFF state, an accessory ON state, an ignition ON state, and a start state.

  The electric load 6 is an electric device that can be operated by supplying power from the battery 2, and can be operated regardless of the state of the IGNSW 4, the accessory ON state, and the ignition ON state. An accessory device that can be operated at a time, a running device that can be operated when the ignition is on, and a starter motor that can be operated when the idling stop is released and when the ignition is on. Including.

  Examples of lamps include headlights and room lights. Examples of the accessory devices include a car audio, a car navigation system, and an electric product (for example, FM transmitter) that is supplied with power through a cigar socket (accessory socket). Examples of the equipment for traveling include an engine control module (ECM) that is directly involved in traveling of the vehicle.

  The power supply control device 10 includes an electronic control unit (ECU) 20, a battery state detection unit 22, a mobile communication circuit 24, an outside air temperature sensor 30 that detects an air temperature outside the vehicle, and an occupant's seat. It includes a seating sensor 32 such as a seat sensor and a seat belt sensor that detects the situation, and a rotation sensor 34 that can detect the engine speed.

  The ECU 20 is configured to be operable when power is supplied from the battery 2 when the IGNSW 4 is in the ON state, that is, in any of the accessory ON state, the ignition ON state, and the start state. And predetermined control processing is performed based on the detection value of various sensors 30, 32, and 34, and the signal from IGNSW4. Further, the ECU 20 executes a predetermined control process after the IGNSW 4 is turned off until a predetermined time elapses, and then executes a self-shutoff process that stops thereafter.

  The battery state detection unit 22 includes a current sensor, a voltage sensor, a temperature sensor, and the like, and detects a discharge current and a charge current of the battery 2, a terminal voltage, a liquid temperature inside the battery 2, and the like by these various sensors.

  The mobile communication circuit 24 is configured to be able to wirelessly communicate with a mobile terminal 40 such as a mobile phone or a tablet terminal. For example, if a notification destination such as a contact information (e-mail address) of the mobile terminal 40 owned by the driver is registered in the ECU 20, the mobile communication circuit 24 sends a response to the mobile terminal 40 based on a command signal from the ECU 20. The predetermined information can be transmitted by e-mail or the like. However, the present invention is not limited to this, and the mobile communication circuit 24 may be built in the ECU 20.

  As shown in FIG. 2, the ECU 20 stores a CPU (Central Processing Unit) 20A, which is a processing device that executes various control programs, and a flash ROM (Read ROM) that stores various control programs and can store various data. (Only Memory) 20B, a RAM (Random Access Memory) 20C serving as a temporary storage area, an input / output circuit 20D, and a bus 20E for interconnecting them are incorporated.

  The detected values of the battery state detection unit 22 and the various sensors 30, 32, and 34, and the signal of IGNSW4 are input to the CPU 20A via the input / output circuit 20D.

  Further, the CPU 20A reads out and executes the control program, so that the remaining amount of the battery 2 (SOC: State of Charge) and the deterioration state (SOH: Battery 2) of the battery 2 are determined based on the detection value of the battery state detection unit 22. (State Of Health) is calculated. These SOC and SOH are stored in the flash ROM 20B when the IGNSW 4 is turned off.

  For example, the SOC is calculated based on an initial SOC, an integrated value of the discharge current amount (or charge current amount) of the battery 2, and a correction value corresponding to the liquid temperature inside the battery 2. Is calculated. The SOH is calculated using a known calculation method, for example, because it is correlated with the internal resistance value of the battery 2 at the time of design and the current internal resistance value of the battery 2. Is done. For example, when the engine is started, the internal resistance value of the battery 2 is calculated based on the open circuit voltage (OCV) before starting the engine and the current and voltage at the maximum load such as when starting the engine (DC internal voltage). Resistance method (IV method)). Further, since the internal resistance value also changes depending on the liquid temperature inside the battery 2, SOH is calculated by adding a correction value based on the liquid temperature. However, the method of calculating SOH is not limited to this. Since the internal resistance value correlates with the impedance and conductance of the battery 2, an impedance method and a conductance method for calculating SOH by obtaining these values are available. Can be mentioned.

  Further, the CPU 20 </ b> A is based on the integrated value of the charge current amount and the integrated value of the discharge current amount of the battery 2 until the IGNSW 4 enters the OFF state (hereinafter referred to as “one-cycle travel”). ) Of the charge amount and the discharge amount (increase / decrease in SOC), that is, the charge / discharge amount of one cycle running. However, the charge amount is not limited to the calculation based on the integrated value of the charge current amount, but is estimated by calculating the operation time (power generation amount) of the alternator based on the travel time and the travel distance. It may be. In addition, when the charge amount and the discharge amount are calculated based on the integrated value of the charge current amount and the integrated value of the discharge current amount of the battery 2, lights, accessory devices, traveling devices, a vehicle air conditioner, etc. The use situation during driving is also taken into consideration.

  The charge / discharge amount is stored as + 2% (or -2%), for example, when the SOC increases (or decreases) by 2% after running for one cycle. Then, the CPU 20A stores the charge / discharge amount of the one-cycle travel in association with at least the day of the week on which the one-cycle travel is performed after the one-cycle travel, that is, when the IGNSW 4 is turned off. The history information of the charge / discharge amount of cycle driving (hereinafter referred to as “history information”) is created. The history information is created, for example, as a simple moving average for a predetermined period (for example, the latest five days) for the total charge / discharge amount for each day of the week from Sunday to Saturday, and is updated for each cycle run. Is done.

  Here, for example, when the vehicle travels in a relatively short time after the engine is started, a sufficient charging time of the battery 2 by the power generation of the alternator is not ensured. Therefore, after the travel, the discharge amount of the battery 2 exceeds the charge amount. When the traveling frequency in such a traveling pattern is high, the SOC of the battery 2 tends to gradually decrease after each traveling. For this reason, when the accessory is turned on while the engine is stopped or when the engine is stopped, the lighting and accessory devices that are in operation are not considered without considering the charge / discharge amount of the battery 2 due to running after the engine is started. If the power supply is stopped, the next engine start may be guaranteed, but the subsequent engine may not be started.

  Therefore, as described below, when the engine is stopped or when the IGNSW 4 is in the accessory ON state while the engine is stopped, the battery 2 between the IGNSW 4 in the starting state and the OFF state is turned on. Based on the charge / discharge amount history information, the charge / discharge amount of the battery 2 due to the travel after starting the engine is estimated, and at least lighting and accessory devices that are operating according to the estimated charge / discharge amount and the remaining amount of the battery 2 By stopping the power supply to one side, it is possible to prevent the engine from being unable to start in the future.

  3 and 4 show an example of the power supply control process executed by the ECU 20 (CPU 20A). FIG. 3 shows an example of a power supply control process that is executed every predetermined time when the ignition is turned on.

  In step S <b> 101, the CPU 20 </ b> A determines whether the engine has stopped based on the detection value of the rotation sensor 34. When CPU 20A determines that the engine has stopped, the process proceeds to step S102. On the other hand, if the CPU 20A determines that the engine is not stopped, the process is terminated.

  In step S102, for example, the CPU 20A determines whether or not the engine stop is caused by the idling stop based on the operating state of the idling stop control device. If CPU 20A determines that it is not idling stop, CPU 20A advances the process to step S103 (NO). On the other hand, if CPU 20A determines that it is an idling stop, the process proceeds to step S109.

  If it is determined in step S102 that it is not idling stop, that is, if the IGNSW 4 is turned off, the lights in the electric load 6 may be operating due to forgetting to turn off the switch. Therefore, the processing after step S103 is performed within a predetermined time for executing the self-shutoff process in order to determine whether or not to stop the power supply to the lights that are operating when the IGNSW 4 is turned off. Executed.

  In step S <b> 103, the CPU 20 </ b> A calculates the charge / discharge amount of one cycle travel performed until the IGNSW 4 is turned off, and updates the history information.

  In step S104, the CPU 20A executes a threshold setting process for setting a first threshold for comparison with the SOC. FIG. 5 shows an example of threshold setting processing executed by the ECU 20 (CPU 20A).

  In step S <b> 301, the CPU 20 </ b> A estimates the charge / discharge amount of the battery 2 due to travel after the engine is started based on the history information. The CPU 20A reads history information about the day of the week corresponding to the current day of the week. Then, if the charge / discharge amount for the read day of the week is + 3%, for example, the CPU 20A determines that there is a high possibility that the SOC will increase by 3% due to the travel after the engine start. The charge / discharge amount is estimated as + 3%. Here, when the engine is stopped, the ECU 2 causes the battery 2 to travel after the engine is started based on the history information of the charge / discharge amount of the battery 2 from when the IGNSW 4 enters the start state until the IGNSW 4 enters the OFF state. As an example of the first estimating means for estimating the amount of charge / discharge.

  In step S302, the CPU 20A sets a first threshold according to the charge / discharge amount estimated in step S301. This first threshold value is for comparison with the SOC, and the estimated charge / discharge amount is, for example, 0% or more and less than 10% (hereinafter referred to as “normal charge mode”) as a reference. It is set (for example, SOC = about 70%). Further, for example, when the estimated charge / discharge amount is + 10% or more (hereinafter referred to as “high charge mode”), there is a possibility that the charge amount of the battery 2 may be larger than that in the normal charge mode by running after the engine is started. high. Therefore, the CPU 20A sets SOC that is lower than that in the normal charging mode as the first threshold value. Here, the first threshold value set in the high charge mode is set as a value obtained by adding a slight margin to the SOC necessary for starting the starter motor. On the other hand, when the estimated charge / discharge amount is less than 0% (hereinafter referred to as “discharge mode”), there is a high possibility that the SOC will decrease during the travel after the engine is started. Therefore, when it is estimated that the amount of charge due to travel after starting the engine is less than the amount of discharge, the CPU 20A sets an SOC higher than that in the normal charge mode as the first threshold value in order to ensure a large SOC. That is, the CPU 20A increases the first threshold value as the estimated charge / discharge amount decreases. Note that when the history information is not stored and the charge / discharge amount due to travel after engine startup cannot be estimated, the first threshold is set to the same value as in the normal charge mode.

  In step S303, the CPU 20A determines whether or not the first threshold needs to be corrected. For example, when the outside air temperature is low, the viscosity of the engine oil may increase. Therefore, it is difficult to start the engine due to an increase in viscous resistance, and there is a possibility that a large amount of electric power is required to start the engine.

  Therefore, if the CPU 20A determines that the outside air temperature is equal to or less than a predetermined value (for example, −10 ° C. or less) based on the detection value of the outside air temperature sensor 30, the CPU 20A corrects the first threshold value in order to secure a large SOC. Therefore, the process proceeds to step S304 ("YES"). In step S304, CPU 20A corrects the first threshold set in step S302 to be further increased, and advances the process to step S105. That is, the CPU 20A corrects the first threshold value to be larger than the set first threshold value when the outside air temperature is equal to or lower than a predetermined value. On the other hand, if the CPU 20A determines that the outside air temperature is not lower than the predetermined value, the CPU 20A considers that the first threshold value need not be corrected, maintains the first threshold value set in step S302 ("NO"), and performs the process. Proceed to step S105. Here, the ECU 20 and the outside air temperature sensor 30 that cooperates with the ECU 20 are examples of a correction unit that corrects the first threshold value based on the outside air temperature.

  In step S105, the CPU 20A determines whether or not the current SOC is less than or equal to the first threshold value or whether or not the SOH calculated at the time of the most recent engine start is less than or equal to the second threshold value. The second threshold value indicates how much the battery 2 has deteriorated by comparison with SOH, and is set to about 30%, for example. If CPU 20A determines that SOC is equal to or lower than the first threshold value or SOH is equal to or lower than the second threshold value, CPU 20A advances the process to step S106 ("YES"). On the other hand, when determining that the SOC is not equal to or lower than the first threshold and the SOH is not equal to or lower than the second threshold, the CPU 20A ends the process (“NO”).

  In step S <b> 106, the CPU 20 </ b> A determines whether or not the notification destination of the portable terminal 40 owned by the occupant is registered in the ECU 20. When CPU 20A determines that the notification destination is registered, CPU 20A advances the process to step S107 ("YES"). On the other hand, when determining that the notification destination is not registered, the CPU 20A advances the process to step S108 (“NO”).

  In step S107, the CPU 20A notifies the portable terminal 40 via the mobile communication circuit 24 that the power supply from the battery 2 to the lamps is stopped due to a decrease in the SOC or SOH, and the process proceeds to step S108. Proceed.

  In step S108, the CPU 20A stops the power supply from the battery 2 to the lamps by executing processing such as controlling the lamp relay circuit to be in an OFF state. Thereafter, the CPU 20A ends the process.

  On the other hand, if it is determined in step S102 that the vehicle is idling stop, the driver may be traveling while using accessory devices in the electric load 6 before the idling stop. Therefore, the process after step S109 determines whether or not to stop the power supply to the accessory devices that are operating during the idling stop. However, steps S109 and S110 are the same as steps S104 and S105, and a description thereof will be omitted.

  If CPU 20A determines “YES” in step S110, the process proceeds to step S111. In step S111, the CPU 20A displays, for a predetermined time, that power supply to the accessory devices is stopped for a predetermined time on a display screen of a car navigation system or a display screen of a multi-function display that is provided in the vehicle interior and can display predetermined information. . Thereafter, the CPU 20A advances the process to step S112 and stops the power supply from the battery 2 to the accessory device by executing a process such as controlling the relay circuit of the accessory device to be in an OFF state. Here, the ECU 20 and the battery state detection unit 22 cooperating with the ECU 20 provide power to at least one of operating lights and accessory devices from the battery 2 according to the estimated charge / discharge amount and the remaining amount of the battery 2. An example of first power supply stopping means for stopping supply is given.

  FIG. 4 shows an example of the power supply control process executed every predetermined time when the IGNSW 4 is in the accessory ON state. Here, when the IGNSW 4 is in the accessory ON state, there is a possibility that at least one of the lights and the accessory devices in the electric load 6 is operated according to the driver's will. Therefore, this power supply control process determines whether or not to stop power supply to at least one of the lights and accessory devices that are operating when the accessory is turned on (hereinafter referred to as “operation load”). judge.

  In step S201, a threshold setting process for setting a first threshold for comparison with the SOC is executed in the same manner as in step S104, that is, steps S301 to S304. Here, ECU20 is mentioned as an example of a 2nd estimation means.

  Step S202 is the same as step S105. If CPU 20A determines “YES” in step S202, the process proceeds to step S203. In step S203, the CPU 20A determines whether an occupant is present in the vehicle. For example, the CPU 20 </ b> A determines whether an occupant is present based on the detection value of the seating sensor 32. If CPU 20A determines that the passenger is not present, the process proceeds to step S204 ("NO"). On the other hand, if CPU 20A determines that an occupant is present, the process proceeds to step S207 ("YES").

  In step S204, the CPU 20A determines whether the notification destination of the portable terminal 40 owned by the occupant is registered in the ECU 20 as in step S106. When CPU 20A determines that the notification destination is registered, CPU 20A advances the process to step S205 ("YES"). On the other hand, when determining that the notification destination is not registered, the CPU 20A advances the process to step S206 ("NO").

  In step S205, the CPU 20A notifies the portable terminal 40 via the mobile communication circuit 24 that the power supply from the battery 2 to the operating load is stopped due to a decrease in SOC or SOH, and the process proceeds to step S206. Proceed.

  In step S206, as in steps S108 and S112, the CPU 20A stops the power supply from the battery 2 to the working load by executing processing such as controlling the relay circuit of the working load to be in an OFF state. Thereafter, the CPU 20A ends the process. Here, the ECU 20 and the battery state detection unit 22 that cooperates with the ECU 20 are examples of the second power supply stop unit.

  In step S207, as in step S111, the CPU 20A displays on the display screen of the car navigation system or the display screen of the multifunction display for a predetermined time that power supply from the battery 2 to the operating load is stopped due to a decrease in SOC or SOH. Then, the process proceeds to step S206. Here, when the ECU 20 or the ECU 20 and the mobile communication circuit 24 that cooperates with the ECU 20 stop the power supply to the operating load, they are given as an example of a notification unit that notifies the vehicle occupant that the power supply is stopped. It is done.

  In addition, when it is determined that the notification destination is not registered in step S106 or S204 and the power supply to the operating load is stopped, when the IGNSW 4 is turned on, such as at the next engine start, the car navigation system On the display screen or the display screen of the multi-function display, it may be displayed for a predetermined time that the power supply is stopped due to the decrease in SOC or SOH.

  According to this power supply control process, when the IGNSW 4 is turned off, when the engine is stopped due to idling stop, or when the IGNSW 4 is turned on the accessory, the charge / discharge amount history of one cycle running Based on the information, the charge / discharge amount of the battery 2 due to traveling after the engine is started is estimated. And when SOC becomes below the 1st threshold value set according to the estimated charging / discharging amount, the electric power supply with respect to an operation load is stopped. Specifically, the first threshold is set so as to increase as the estimated charge / discharge amount decreases. Based on the first threshold value set in this way, the power supply to the operating load that is operating due to the driver's will or forgetting to turn off the switch is stopped, for example, charging by running after the engine is started Even when the amount is estimated to be lower than the discharge amount, a relatively large SOC is secured, so that not only the next engine start is guaranteed, but also the engine can be prevented from starting in the future. .

  The first threshold value is corrected based on the outside air temperature. Specifically, when the outside air temperature is equal to or lower than a predetermined value, the first threshold value is corrected so as to be larger than the first threshold value set based on the estimated charge / discharge amount. By stopping the power supply to the operating load based on the first threshold value corrected in this way, for example, even when the outside air temperature is low and a large amount of power is required to start the engine, the SOC is relatively low. Since a large amount is secured, not only the next engine start can be guaranteed, but also the engine can be prevented from starting in the future.

  Further, according to the power supply control process, when the SOC becomes equal to or lower than the first threshold value or when the SOH becomes equal to or lower than the second threshold value, power supply to the working load is stopped. Thereby, even if the SOC is sufficiently secured (SOC> first threshold), it can be determined that the battery 2 is deteriorated (SOH ≦ second threshold). Thereafter, the driver or passenger is informed that the power supply is stopped due to a decrease in SOH, and the power supply is stopped, so that further deterioration of the battery 2 due to the operation of lights and accessory devices can be suppressed, The driver can be prompted to replace the battery 2.

  Further, when the power supply is stopped, the passenger including the driver is informed that the power supply is stopped (or stopped) due to the decrease in the SOC, so that the passenger including the driver is in the state of the battery 2. It is possible to know that the power supply has been stopped.

  In addition to notifying that power supply is stopped (or having been stopped), the current SOC and SOH values are displayed on the display screen of the portable terminal 40, the car navigation system, or the display screen of the multifunction display. It may be.

Here, the technical idea that can be understood from the above-described embodiment will be described below.
(1) When the engine is stopped, the power supply control device is based on the travel after the engine is started based on the history information of the charge / discharge amount of the battery from when the ignition switch is turned on to when it is turned off. The first estimation means for estimating the charge / discharge amount of the battery, and the power supply to at least one of the operating lamps and accessory devices is stopped according to the estimated charge / discharge amount and the remaining amount of the battery. First power supply stopping means.

(2) When the ignition switch is in the accessory ON state, the power supply control device is based on the history information of the charge / discharge amount of the battery from the start of the ignition switch to the OFF state. A second estimating means for estimating a charge / discharge amount of the battery due to running after starting, and at least one of operating lights and accessory devices according to the estimated charge / discharge amount and the remaining amount of the battery Second power supply stopping means for stopping the power supply.

(3) The first power supply stop unit or the second power supply stop unit is configured such that the remaining amount of the battery is equal to or less than a first threshold set based on the estimated charge / discharge amount. In addition, power supply to at least one of the lamps and accessory devices is stopped.
(4) The first power supply stop unit or the second power supply stop unit increases the first threshold value as the estimated charge / discharge amount decreases.

(5) The power supply control device further includes correction means for correcting the threshold value based on an outside air temperature.
(6) The correction unit corrects the first threshold value so as to be larger than the set first threshold value when the outside air temperature is equal to or lower than a predetermined value.

(7) The first power supply stop unit or the second power supply stop unit may be configured such that when the remaining amount is equal to or less than the first threshold value, or a value indicating a deterioration state of the battery is equal to or less than the second threshold value. At a certain time, power supply to at least one of the lights and accessory devices is stopped.

(8) The power supply control device further includes notification means for notifying a vehicle occupant that the power supply is stopped when the power supply is stopped.

2 Battery 4 Ignition switch (IGNSW)
6 Electric Load 10 Power Supply Control Device 20 Electronic Control Device (ECU)
20A CPU
20B Flash ROM
20C RAM
20D input / output circuit 20E bus 22 battery state detection unit 30 outside air temperature sensor

Claims (5)

When the engine is stopped, the charge / discharge amount of the battery due to the travel after starting the engine is estimated based on the history information of the charge / discharge amount of the battery from when the ignition switch is started to the OFF state. First estimating means;
And a first power supply stop unit that stops power supply to at least one of the operating lamps and accessory devices according to the estimated charge / discharge amount and the remaining amount of the battery. When the ignition switch is in the accessory ON state, the battery is charged by running after the engine is started based on the history information of the charge / discharge amount of the battery from when the ignition switch is in the start state to the OFF state. A second estimating means for estimating a discharge amount;
And a second power supply stop unit that stops power supply to at least one of the operating lamps and accessory devices according to the estimated charge / discharge amount and the remaining amount of the battery.   The first power supply stop unit or the second power supply stop unit is configured to detect the lamps and the lights when the remaining amount of the battery is equal to or less than a threshold set based on the estimated charge / discharge amount. The power supply control device according to claim 1 or 2, wherein power supply to at least one of the accessory devices is stopped.   The power supply control device according to claim 3, wherein the first power supply stop unit or the second power supply stop unit increases the threshold value as the estimated charge / discharge amount decreases.   The power supply control device according to claim 3, further comprising a correction unit that corrects the threshold value based on an outside air temperature.