JP2010076509A - Power supply monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply monitoring device that can suitably prevents the over-discharge of a battery, not only when an engine is stopped but when the engine is operated. <P>SOLUTION: A switch control ECU 19a is connected to a voltage sensor 19d that detects a battery voltage of an on-vehicle battery. The switch control ECU 19a includes a power supply monitor 41 that detects the residual capacity of the on-vehicle battery based on a voltage detection signal SV output from the voltage sensor 19d, and that restricts the operation of on-vehicle devices 15 to 18 based on the detected residual capacity. In a memory 42 of the power supply monitor 41, a residual-capacity determination value is stored which is a criterion by which to determine whether to restrict the operation of each of the on-vehicle devices 15 to 18. The power supply monitor 41 outputs an operation restriction signal when the voltage of the on-vehicle battery decreases below the residual-capacity determination value, and restricts the operation of the on-vehicle devices 15 to 18 corresponding to the residual-capacity determination value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply monitoring device that monitors the remaining amount of a storage battery serving as a power source when starting an engine, and prevents power shortage at engine startup due to overdischarge of the storage battery.

  Conventionally, a vehicle is equipped with a storage battery that serves as a power source for starting an engine and a power source for electrical components such as a headlight. The vehicle is equipped with a generator driven by an engine, and the electric power generated by the generator when the engine is started is charged to the storage battery.

  By the way, the headlight of the vehicle can be used when the vehicle is parked, that is, when the engine is stopped. When the headlight is turned on with the engine stopped, the power of the storage battery is consumed and the remaining capacity is reduced. For this reason, if the lighting time of the headlight in a state where the engine is stopped becomes long, for example, when the headlight is forgotten to be turned off when the vehicle is parked, the voltage of the storage battery becomes lower than the voltage required for starting the engine and the engine is restarted. In some cases, it was impossible to do this.

In order to avoid such a situation, as shown in, for example, Patent Document 1, the vehicle monitors the remaining capacity of the storage battery and limits the supply of power to the headlight according to the remaining capacity. Is installed. This power supply monitoring device calculates the remaining capacity of the storage battery from the voltage value of the storage battery and the current value flowing out to the in-vehicle device after the engine is stopped. Then, the storage battery is prevented from being overdischarged when the vehicle is parked by cutting off the power supply to the headlight until the remaining capacity is reduced to a minimum required capacity for restarting the engine.
Japanese Patent Laid-Open No. 10-70844

  By the way, in addition to the headlight described above, an audio device, an air conditioner device, and the like are mounted on the vehicle as a device using a storage battery as a power source. For example, when using multiple in-vehicle devices at the same time when the amount of power generated by the engine is low, such as when using an audio device or an air conditioner device with the headlights lit during night traffic, The power consumption of the in-vehicle device becomes larger than the power generation amount of the engine. As described above, when the power consumption of the in-vehicle device is larger than the power generation amount of the engine, the remaining capacity of the storage battery is reduced. For this reason, there is a possibility that overdischarge of the storage battery may occur even when the engine is started.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply monitoring apparatus capable of suitably suppressing overdischarge of a storage battery not only when the engine is stopped but also when the engine is driven. There is.

  The invention according to claim 1 is set in advance for each of a plurality of in-vehicle devices using a remaining amount detecting means for detecting a remaining amount of a storage battery serving as a power source when starting an engine of the vehicle and the storage battery as a power source. Storage means for storing a plurality of remaining amount determination values, and each time the remaining amount of the storage battery falls below each remaining amount determination value, the operation of the in-vehicle device corresponding to the remaining amount determination value is limited. Is the gist.

  According to the present invention, every time the remaining amount of the storage battery falls below a preset remaining amount determination value, the operation of the in-vehicle device corresponding to the remaining amount determination value is limited. For this reason, as the remaining amount of the storage battery decreases, the operation of the in-vehicle device is sequentially limited in the order corresponding to the remaining amount determination value stored in advance in the storage unit, and the remaining amount of the storage battery decreases. The consumption of the storage battery by the in-vehicle device is suppressed. Therefore, the overdischarge of the storage battery due to the power consumption of the in-vehicle device exceeding the power generation amount of the engine can be suitably suppressed. Moreover, it becomes possible to suppress consumption of the storage battery when the engine is stopped, and it is possible to suitably suppress overdischarge of the storage battery.

  According to a second aspect of the present invention, the plurality of in-vehicle devices adjust a traveling system in-vehicle device that adjusts an environment outside the vehicle room related to the traveling of the vehicle, and a vehicle interior environment that is not directly related to the driving of the vehicle. A remaining amount determination value for restricting the operation of the non-travel in-vehicle device is set higher than a remaining amount determination value for restricting the operation of the travel in-vehicle device. Is the gist.

  According to the present invention, since the remaining amount determination value at the time of restricting the operation of the non-travel in-vehicle device is set higher than the remaining amount determination value at the time of restricting the operation of the traveling in-vehicle device, a plurality of in-vehicle devices are When the operation of the in-vehicle device is restricted when the remaining capacity of the storage battery decreases due to simultaneous use, the operation of the non-traveling in-vehicle device is restricted before the operation of the traveling in-vehicle device is restricted. For this reason, it is possible to suppress the consumption of the storage battery by the amount that the operation of the non-traveling in-vehicle device is limited, and the operation of the traveling in-vehicle device can be continued for a longer period. In addition, the user can grasp that the remaining capacity of the storage battery is reduced before the operation of the traveling system on-board device is limited based on the operation of the non-traveling system on-vehicle device being limited. . For this reason, the user can take some measures before the operation of the traveling system on-board equipment is limited. Therefore, it is possible to prevent the operation of the traveling system in-vehicle device from being restricted.

  The invention according to claim 3 is connected to a plurality of control means for controlling the operation of the in-vehicle device via a communication line, and each time the remaining amount of the storage battery falls below each remaining amount determination value, The gist of the invention is that an operation restriction signal for restricting the operation of the in-vehicle device corresponding to the remaining amount determination value is output to the control device of the in-vehicle device via the communication line.

  For example, when the power supply to multiple in-vehicle devices is cut off and the operation of the in-vehicle devices is restricted individually, the power line between the storage battery and each in-vehicle device must be individually cut off, making the system configuration complicated. Therefore, the attachment to the vehicle becomes complicated. According to the present invention, a plurality of control means for controlling the operation of the in-vehicle device is connected via the communication line. And operation | movement of a vehicle equipment is restrict | limited by communication between vehicle equipment. For this reason, compared to the case where the power supply to a plurality of in-vehicle devices is cut off and the operation of the in-vehicle devices is individually restricted, wiring becomes easier and the system configuration is simplified, so that it is easy for the vehicle. Can be attached.

  According to a fourth aspect of the present invention, there is provided an operation detection means for detecting an operation of an operation device corresponding to the in-vehicle device, and an operation corresponding to the operation is requested based on a detection result of the operation detection means. The gist is to output an operation request signal to the in-vehicle device via the communication line.

  According to the present invention, an operation request signal for requesting an operation corresponding to the operation of the operation device corresponding to the in-vehicle device is output from the power supply monitoring device. In this way, by integrating the operation device and the power supply monitoring device that are normally provided in the vehicle corresponding to the in-vehicle device, it becomes possible to mount the power supply monitoring device in the vehicle without increasing the number of communication lines. The cost required for the communication line can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply monitoring apparatus which can suppress suitably the overdischarge of the storage battery not only at the time of an engine stop but at the time of engine drive can be obtained.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle 10 includes a collation control device 11 that determines the validity of an electronic key K possessed by a user, and management of power supplied to various control devices and in-vehicle devices from an in-vehicle battery 12 as a storage battery. There are provided a power supply control device 13 for performing the above and an engine control device 14 for controlling the engine E. In addition, the vehicle 10 is equipped with in-vehicle devices such as an audio device 15, an air conditioner device (hereinafter referred to as an air conditioner device) 16, a wiper device 17, and a lighting device 18. The collation control device 11, the power supply control device 13, the engine control device 14, the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18 are connected to each other through a bus (multiplex communication line) B. A combination switch device (hereinafter referred to as a switch device) 19 as an operation device for operating the wiper device 17 and the lighting device 18 is also connected to the bus B. The bus B corresponds to a communication line.

<Verification control device>
The verification control device 11 includes a plurality of vehicle interior transmitters 21 (only one is shown in FIG. 1), a plurality of vehicle interior transmitters 22 (only one is shown in FIG. 1), and reception. Machine 23 is connected. The vehicle exterior transmitter 21 is disposed, for example, inside each side door and luggage door of the vehicle 10 and transmits a radio signal in the LF band outside the vehicle interior. The vehicle interior transmitter 22 is disposed, for example, under the floor of the vehicle 10 and transmits a radio signal in the LF band to the vehicle interior. The receiver 23 is provided, for example, inside a pillar on the rear seat side of the vehicle 10 and receives an RF band radio signal.

  In addition, a touch sensor 24 and a door lock switch 25 are connected to the verification control device 11. The touch sensor 24 is provided, for example, on the back surface of a door outside handle (not shown) of the vehicle 10 and detects that the handle is gripped by a user (in this case, a driver). The door lock switch 25 is provided on the surface of the door outside handle and is pressed by the user when locking the unlocked door.

  Then, the verification control device 11 determines the validity of the electronic key K through wireless communication with the electronic key K possessed by the user, and locks and unlocks the door of the vehicle 10 based on the determination result. Specifically, in the parking state in which the engine E is stopped and all the doors are closed and locked, the verification control device 11 sends a response request signal for verification outside the vehicle to the electronic key K through the transmitter 21 outside the vehicle. By transmitting Sreq (LF band radio signal), an outside communication area of the electronic key K is formed around the vehicle 10.

  When the user who possesses the electronic key K enters the vehicle exterior communication area and the electronic key K receives the response request signal Sreq for vehicle exterior verification, the electronic key K responds to the response request signal Sreq for vehicle exterior verification. A response signal Srep (RF band radio signal) is transmitted. When the response control device 11 receives the response signal Srep through the receiver 23 in the passenger compartment, the verification control device 11 compares the ID code registered therein with the ID code of the electronic key K included in the received response signal Srep. (External vehicle collation), and when the collation is established, the door unlocking is permitted and the touch sensor 24 is activated to enter the door unlock standby state. When the touch sensor 24 detects that the door outside handle is grasped while being kept in the door unlock standby state, the touch sensor 24 outputs a touch sensor ON signal to the verification control device 11. When receiving the touch sensor ON signal, the verification control device 11 outputs an unlock request signal for requesting unlocking of the door to the power control device 13.

  Further, when the user holding the electronic key K opens the door and gets into the vehicle 10 after unlocking the door, the collation control device 11 detects this by a door courtesy switch 33 described later, and also transmits the vehicle interior transmitter 22. A response request signal Sreq for vehicle interior verification is transmitted through Thus, a vehicle interior communication area for the electronic key K is formed in the vehicle interior. When the electronic key K receives the response request signal Sreq for vehicle interior verification, it returns a response signal Srep for vehicle interior verification including an ID code unique to itself. When the verification control device 11 receives the response signal Srep for vehicle interior verification through the receiver 23, the verification control device 11 compares the ID code registered therein with the ID code included in the response signal Srep for vehicle interior verification (vehicle interior verification). ) And temporarily stores the collation result.

  Then, the collation control device 11 determines the validity of the electronic key K, that is, the collation result of the ID code, according to the execution functions of the various in-vehicle systems mounted on the vehicle 10. To bus B. Specifically, the collation control device 11 transmits the collation result of the ID code through the bus B to the power control device 13 and the engine control device 14 that are shared by various in-vehicle systems. For example, when the engine E is started by the user, the verification control device 11 receives a verification request for the verification result from the power control device 13 and transmits the ID code verification result to the power control device 13. To do. Further, the collation control device 11 gives a start permission signal Sp for permitting the start of the engine E at a predetermined timing when the user performs a start operation of the engine E in a state where the collation of the ID code is established. The data is transmitted to the engine control device 14 through the bus B.

<Power control device>
On the other hand, an engine switch 31 and a power relay circuit 32 are connected to the power controller 13.

  The engine switch 31 is a push switch that is pressed to switch the power position of the vehicle 10 when operating the vehicle E (accessory) such as the audio device 15 or the air conditioner 16 and the engine E. When the engine switch 31 is pressed, it outputs an operation signal indicating that to the power supply control device 13. The power relay circuit 32 includes an accessory relay 32a and an ignition relay 32b. When the accessory relay 32 a is turned on based on a command from the power control device 13, power from the in-vehicle battery 12 is supplied to the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18. Further, when the ignition relay 32b is turned on based on a command from the power supply control device 13, electric power from the in-vehicle battery 12 is supplied to a start assist circuit (not shown) of the engine E.

In addition, a door courtesy switch 33, a door lock motor 34, and a door lock position switch 35 are connected to the power supply control device 13.
The door courtesy switch 33 detects the door open / close state of the vehicle 10 and outputs a door open / close signal to the power supply control device 13. The door lock motor 34 operates to lock and unlock the door according to a lock signal (lock current) and an unlock signal (unlock current) output from the power supply control device 13. The door lock position switch 35 detects the locking / unlocking state of the door and outputs a locking / unlocking state signal to the power supply control device 13.

Furthermore, a parking brake switch 36, a stop lamp switch 37, and a shift position sensor 38 are connected to the power supply control device 13.
The parking brake switch 36 detects the operation of the parking brake and outputs an operation signal to the power supply control device 13. The power supply control device 13 determines that the parking brake is operating when the operation signal is input, and determines that the parking brake is released when the operation signal is not input.

  The stop lamp switch 37 detects a depression operation of a brake pedal (not shown) and outputs a brake pedal on signal to the power supply control device 13. The power supply control device 13 determines that the brake pedal is depressed when the brake pedal on signal is input, and determines that the brake pedal is not depressed when the brake pedal on signal is not input.

  The shift position sensor 38 detects that a shift position that is an operation position of a shift lever (not shown) is held at a parking position “P” that is a parking position, and outputs a parking position signal to the power supply control device 13. When the parking position signal is input, the power control device 13 determines that the shift lever is held at the parking position, and when the parking position signal is not input, the shift lever is at a position other than the parking position (for example, the drive position). ).

  When it is detected that the shift lever is held at the parking position and the brake pedal is depressed, the power supply control device 13 determines whether there is an abnormality in the device related to the start of the engine E, and It is determined whether or not starting is possible. If there is no abnormality in the device related to the start of the engine E, the power supply control device 13 determines that the engine E can be started. When it is determined that the engine E can be started, the engine switch 31 is detected in a state where it is detected that the shift lever is held at the parking position and the brake pedal is depressed. When the operation signal from is input, a start request signal Seg for requesting start of the engine E is output to the engine control device 14 through the bus B. On the other hand, if there is an abnormality in the device related to the start of the engine E, the power supply control device 13 determines that the engine E cannot be started. When it is determined that the engine E cannot be started, the engine switch 31 is detected in a state where it is detected that the shift lever is held at the parking position and the brake pedal is depressed. When the operation signal from is input, the start request signal Seg for requesting the start of the engine E is not output.

  Further, the power supply control device 13 is in the case where the shift lever is held at the parking position, and every time an operation signal from the engine switch 31 is inputted when it is not detected that the brake pedal is depressed. Then, the power position of the vehicle 10 is switched in the order of off position → accessory position → ignition on position → off position. That is, the power supply control device 13 turns off both the accessory relay 32a and the ignition relay 32b when the power supply position of the vehicle 10 is turned off, and turns the accessory relay 32a on when switching to the accessory position. When switching to the ignition on position, the ignition relay 32b is further turned on.

  When the power supply control device 13 receives the unlocking request signal from the verification control device 11, the power supply control device 13 drives the door lock motor 34 to unlock all doors and receives the lock request signal from the verification control device 11. Then, the door lock motor 34 is driven and locked by interlocking with all doors. The power supply control device 13 recognizes that the door is unlocked when the door lock position switch 35 changes from the off state to the on state, that is, when the unlock state signal is input from the door lock position switch 35. . Further, the power supply control device 13 recognizes that the door is in the locked state when the door lock position switch 35 is switched from the on state to the off state, that is, when the lock state signal is input from the door lock position switch 35. .

  By the way, as described above, the engine E of the vehicle 10 is started using the vehicle-mounted battery 12 as a power source. On the other hand, the in-vehicle device mounted on the vehicle 10 also operates using the in-vehicle battery 12 as a power source. For this reason, if the remaining capacity of the in-vehicle battery 12 decreases due to the use of the in-vehicle device and the voltage falls below a voltage required when starting the engine E, the engine cannot be restarted. In order to avoid such a situation, the vehicle 10 is equipped with a power supply monitoring system that monitors the voltage of the in-vehicle battery 12.

<Power supply monitoring system>
Next, the power supply monitoring system will be described.
As shown in FIG. 2, the switch control ECU 19a of the switch device 19 is connected to a wiper switch 19b as an operation detecting means. The wiper switch 19b outputs an operation detection signal based on an ON / OFF operation of a wiper lever (not shown) provided in, for example, a steering column in the vehicle interior. The switch control ECU 19a detects an on / off operation of the wiper lever based on an operation detection signal from the wiper switch 19b, and outputs a wiper switch operation signal indicating that to the wiper device 17. The wiper switch operation signal corresponds to an operation request signal. The switch control ECU 19a is connected with a light switch 19c as an operation detecting means. The light switch 19c outputs an operation detection signal based on an on / off operation of a light switch knob (not shown). The switch control ECU 19a detects an on / off operation of the light switch knob based on an operation detection signal from the light switch 19c, and outputs a light switch operation signal indicating that to the lighting device 18. This light switch operation signal also corresponds to an operation request signal.

  The switch control ECU 19a is connected to a voltage sensor 19d as a remaining amount detecting means for detecting the battery voltage of the in-vehicle battery 12. The switch control ECU 19a includes a power monitoring unit 41 that restricts the operation of in-vehicle devices such as the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18 based on the voltage detection signal SV output from the voltage sensor 19d. Yes. The memory 42 serving as the storage unit of the power supply monitoring unit 41 stores remaining amount determination values V1 to V4 that are determination criteria for limiting the operations of the in-vehicle devices 15 to 18.

  As shown in FIG. 3, the remaining amount determination values V1 to V4 are voltage values corresponding to the remaining capacity of the in-vehicle battery 12, and are set for each of the in-vehicle devices 15 to 18. Further, the remaining amount determination values V1 and V2 of the in-vehicle devices that are not directly related to the traveling of the vehicle such as the audio device 15 and the air conditioner device 16 are the remaining amount determination values of the in-vehicle devices that are related to the traveling of the vehicle such as the wiper device 17 and the lighting device 18. It is set higher than V3 and V4. Specifically, the remaining amount determination value V1 of the audio device 15 is the highest. Hereinafter, the remaining amount determination value V2 of the air conditioner device 16, the remaining amount determination value V3 of the wiper device 17, and the remaining amount determination value V4 of the lighting device 18 are as follows. It is set low in order. Further, the remaining amount determination value V4 of the lighting device 18 is set to be larger than the voltage Vig required when starting the engine E. The audio device 15 and the air conditioner device 16 correspond to non-traveling vehicle-mounted devices, and the wiper device 17 and the lighting device 18 correspond to traveling-system vehicle-mounted devices.

  The power supply monitoring unit 41 is an operation restriction signal for restricting the operation of the in-vehicle devices 15 to 18 corresponding to the remaining amount determination values V1 to V4 each time the voltage of the in-vehicle battery 12 falls below the remaining amount determination values V1 to V4. Is output.

  An audio switch 15b is connected to the audio control ECU 15a of the audio device 15. The audio switch 15b outputs an audio operation signal based on an on / off operation of an audio button (not shown) provided on the instrument panel in the vehicle interior. The audio control ECU 15a detects the on / off operation of the audio button based on the audio operation signal output from the audio switch 15b, and activates or stops the audio device 15. The audio control ECU 15a stops the active audio device 15 based on the operation restriction signal output from the switch control ECU 19a.

  An air conditioner switch 16 b is connected to the air conditioner control ECU 16 a of the air conditioner device 16. The air conditioner switch 16b outputs an air conditioner operation signal based on an on / off operation of an air conditioner button (not shown) provided on an instrument panel (not shown) in the passenger compartment. The air conditioner control ECU 16a detects the on / off operation of the air conditioner button based on the air conditioner operation signal output from the air conditioner switch 16b, and activates or deactivates the air conditioner device 16. The air conditioner control ECU 16a stops the operating air conditioner device 16 based on the operation restriction signal output from the switch control ECU 19a.

  A wiper switch operation signal output from the switch control ECU 19a of the switch device 19 is input to the wiper ECU 17a of the wiper device 17 via the bus B. The wiper ECU 17a supplies driving power to the wiper motor 17b based on the wiper switch operation signal. The wiper motor 17b drives to wipe the window glass. The wiper ECU 17a stops the wiper device 17 that is operating based on the operation restriction signal output from the switch control ECU 19a.

  A light switch operation signal output from the switch control ECU 19a of the switch device 19 is input to the lamp control ECU 18a of the lamp device 18 via the bus B. The lighting control device detects an on / off operation of the light switch 19c based on the light switch operation signal, and turns on or off the headlight 18b. The lighting control ECU 18a turns off the headlight 18b that is turned on based on the operation restriction signal output from the switch control ECU 19a.

Next, the operation of the switch device 19 will be described.
When the user holding the electronic key K opens the door and gets into the vehicle 10, the verification control device 11 determines the validity of the electronic key K through mutual wireless communication with the electronic key K. When it is determined that there is an electronic key K, the determination result is temporarily stored assuming that the electronic key K exists in the passenger compartment. When the power control device 13 detects that the shift lever is held at the parking position and detects the depression of the brake pedal and the pressing operation of the engine switch 31, the user enters the vehicle interior. The verification result of the validity of the electronic key K performed when boarding is confirmed with respect to the verification control device 11. Then, the verification control device 11 responds to the power supply control device 13 with the result of determining the validity of the electronic key K.

  If the determination result of the validity of the electronic key K acquired through the verification control device 11 is a determination result indicating that it is appropriate, the power supply control device 13 turns on the accessory relay 32a and the ignition relay 32b. Thereby, operating power is supplied to or can be supplied to each part of the vehicle 10.

  Then, the power supply control device 13 transmits a start request signal Seg for requesting start of the engine E to the engine control device 14 through the bus B. Further, when it is determined that the electronic key K is appropriate, the collation control device 11 transmits a start permission signal Sp for permitting the start of the engine E to the engine control device 14 through the bus B at this timing. The engine control device 14 drives a starter motor (not shown) or performs fuel injection control when both the start request signal Seg from the power supply control device 13 and the start permission signal Sp from the verification control device 11 are input. Or start the engine E. The engine control device 14 determines that the engine E has completely started operation when the rotational speed of the engine E becomes equal to or higher than a set value, and outputs a complete explosion detection signal indicating that to the power supply control device 13. The power supply control device 13 receives the complete explosion detection signal from the engine control device 14 and stops outputting the start request signal Seg. Thus, the starting operation of the engine E is completed.

As the engine E starts, a generator (not shown) is driven. The on-vehicle battery 12 is charged with electric power by driving the generator.
Here, it is assumed that an accelerator pedal (not shown) is depressed when the engine E is driven, for example, when the vehicle 10 is traveling on a road. In this case, the power generation amount of the generator by driving the engine E is larger than the power generation amount when the accelerator pedal is not depressed. Therefore, when a plurality of in-vehicle devices 15 to 18 are simultaneously used in such a state, the power generation amount of the generator usually exceeds the total power consumption of the in-vehicle devices 15 to 18. Thus, the vehicle-mounted battery 12 will not be over-discharged in the normal driving | running | working state in which the electric power generation amount of a generator exceeds the whole power consumption of the vehicle-mounted apparatuses 15-18.

  On the other hand, it is assumed that the accelerator pedal is not depressed when the engine E is driven, for example, when the vehicle 10 is involved in a traffic jam or is stopped. In this case, the power generation amount of the generator by driving the engine E is smaller than the power generation amount when the accelerator pedal is depressed. Therefore, when a plurality of in-vehicle devices 15 to 18 are simultaneously used in such a state, the power consumption of the in-vehicle devices 15 to 18 may exceed the power generation amount of the engine E. Thus, in the stop state where the power consumption of the in-vehicle devices 15 to 18 exceeds the power generation amount of the generator, the remaining capacity of the in-vehicle battery 12 decreases.

  As described above, the switch control ECU 19a of the switch device 19 of the present embodiment detects the voltage of the in-vehicle battery 12, and whenever the voltage falls below the remaining amount determination values V1 to V4, the remaining amount determination values V1 to V1. An operation restriction signal for restricting the operations of the in-vehicle devices 15 to 18 corresponding to V4 is output. Specifically, for example, when the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18 are used, the voltage of the in-vehicle battery 12 restricts the operation of the audio device 15 as shown in FIG. 3. When it falls below the remaining amount determination value V1 that is a determination criterion, the switch control ECU 19a outputs an operation restriction signal to the audio control ECU 15a. Upon receiving this operation restriction signal, the audio control ECU 15a stops the operation of the audio device 15. For this reason, after this, consumption of the electric power of the in-vehicle battery 12 due to the use of the audio device 15 is suppressed.

  Further, when the remaining capacity of the in-vehicle battery 12 decreases and the voltage falls below a remaining amount determination value V2 that is a determination criterion for restricting the operation of the air conditioner device 16, the switch control ECU 19a stops to the air conditioner control ECU 16a. Outputs an operation restriction signal. In response to this operation restriction signal, the air conditioner control ECU 16 a stops the operation of the air conditioner device 16. For this reason, after this, consumption of the electric power of the vehicle-mounted battery 12 by use of the air conditioner device 16 is suppressed.

  Further, when the remaining capacity of the in-vehicle battery 12 decreases and the voltage falls below the remaining amount determination value V3 that is a determination criterion for limiting the operation of the wiper device 17, the switch control ECU 19a stops the operation to the wiper ECU 17a. The operation limit signal is output. In response to the operation restriction signal, the wiper ECU 17a stops the operation of the wiper device 17. For this reason, after this, consumption of the electric power of the in-vehicle battery 12 due to the use of the wiper device 17 is suppressed.

  Further, when the remaining capacity of the in-vehicle battery 12 decreases and the voltage falls below the remaining amount determination value V4 that is a determination reference value for limiting the operation of the lighting device 18, the switch control ECU 19a stops the operation to the lighting device 18. An operation restriction signal indicating that In response to this operation restriction signal, the lighting device 18 turns off the headlight 18b that is being lit. For this reason, after this, consumption of the electric power of the vehicle-mounted battery 12 by use of the lighting device 18 is suppressed.

  Thus, in accordance with the remaining amount determination values V1 to V4 stored in advance in the memory 42 of the switch device 19 (specifically, the power monitoring unit 41) as the remaining amount of the in-vehicle battery 12 decreases, Operations of the in-vehicle devices 15 to 18 are sequentially limited. For this reason, consumption of the vehicle-mounted battery 12 by the vehicle-mounted devices 15-18 is suppressed, so that the residual amount of the vehicle-mounted battery 12 falls. Therefore, for example, when there is a traffic jam at night, a large number of in-vehicle devices are used simultaneously when the power generation amount of the engine E is small, such as when the audio device 15 or the air conditioner device 16 is used with the headlight 18b lit. Thus, it is possible to prevent the in-vehicle battery 12 from being overdischarged.

  When the voltage of the in-vehicle battery 12 falls below a remaining amount determination value V4 that is a determination criterion for limiting the operation of the lighting device 18, the power of the in-vehicle battery 12 by the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18 is obtained. Consumption is suppressed. Since the remaining amount determination value V4 of the lighting device 18 is set to be larger than the voltage Vig necessary for restarting the engine E, electric power of the in-vehicle battery 12 necessary for restarting the engine E is ensured.

  Further, the remaining amount determination value serving as a determination criterion when restricting the operation includes the remaining amount determination value V1 of the audio device 15, the remaining amount determination value V2 of the air conditioner device 16, the remaining amount determination value V3 of the wiper device 17, and the lighting device. It is set to decrease in the order of 18 remaining amount judgment value V4. For this reason, as the remaining capacity decreases, the operation is sequentially limited in the order of the audio device 15, the air conditioner device 16, the wiper device 17, and the lighting device 18. That is, when the remaining capacity of the in-vehicle battery 12 decreases, the operation of the traveling on-vehicle devices 17 and 18 such as the wiper device 17 and the lighting device 18 causes the non-traveling on-vehicle devices 15 and 16 such as the audio device 15 and the air conditioner 16 to operate. It is given priority over the operation of. In addition, by restricting the operation of the non-traveling in-vehicle devices 15 and 16, power consumption required for the operation of the non-traveling in-vehicle devices 15 and 16 is suppressed. For this reason, the traveling system vehicle-mounted devices 17 and 18 can be operated for a longer period.

  Further, for example, a case where a plurality of in-vehicle devices 15 to 18 are operated when the engine E is stopped is assumed. Also in this case, the remaining capacity of the in-vehicle battery 12 is reduced. As described above, as the remaining amount of the in-vehicle battery 12 decreases, the operations of the in-vehicle devices 15 to 18 are sequentially performed in the order corresponding to the remaining amount determination values V1 to V4 stored in the memory 42 of the switch device 19 in advance. Limited. As the operations of the in-vehicle devices 15 to 18 are limited, the consumption of the in-vehicle battery 12 by the in-vehicle devices 15 to 18 is suppressed. Therefore, for example, it is possible to prevent the in-vehicle battery 12 from being over-discharged at night when the lighting device 18 is used and the vehicle 10 is left for a long time.

Next, the operational effects of the above embodiment will be described below.
(1) The power supply monitoring unit 41 of the switch device 19 each time the remaining amount of the in-vehicle battery 12 falls below the preset remaining amount determination values V1 to V4, the in-vehicle device 15 corresponding to the remaining amount determination values V1 to V4. Limit the operation of ~ 18. For this reason, as the remaining amount of the in-vehicle battery 12 decreases, the operations of the in-vehicle devices 15 to 18 are sequentially limited in the order according to the remaining amount determination values V1 to V4 stored in the memory 42 in advance. As the remaining amount of the in-vehicle battery 12 decreases, the consumption of the in-vehicle battery 12 by the in-vehicle devices 15 to 18 is suppressed. Therefore, overdischarge of the in-vehicle battery 12 due to the power consumption of the in-vehicle devices 15 to 18 exceeding the power generation amount of the engine E can be suitably suppressed.

  (2) Further, the power supply monitoring unit 41 of the switch device 19 also includes the remaining amount determination value every time the remaining amount of the in-vehicle battery 12 falls below the preset remaining amount determination values V1 to V4 even when the engine E is stopped. The operations of the in-vehicle devices 15 to 18 corresponding to V1 to V4 are limited. For this reason, it becomes possible to suppress the consumption of the in-vehicle battery 12 when the engine E is stopped, and the overdischarge of the in-vehicle battery 12 can be suitably suppressed.

  (3) The remaining amount determination values V1 and V2 when restricting the operation of the non-travel in-vehicle devices such as the audio device 15 and the air conditioner 16 are limited to the operation of the travel in-vehicle devices such as the wiper device 17 and the lighting device 18. Is set higher than the remaining amount determination values V3 and V4. For this reason, when the operation of the in-vehicle devices 15 to 18 is restricted when the remaining capacity of the in-vehicle battery 12 is reduced by using the plurality of in-vehicle devices 15 to 18 simultaneously, the operation of the traveling in-vehicle devices 17 and 18 is performed. The operation of the non-travel in-vehicle devices 15 and 16 is restricted before the restriction is restricted. Therefore, the consumption of the in-vehicle battery 12 can be suppressed by the amount that the operations of the non-travel in-vehicle devices 15 and 16 are limited, and the operation of the travel in-vehicle devices 17 and 18 can be continued for a longer period. Further, the user can reduce the remaining capacity of the in-vehicle battery 12 before the operation of the traveling system on-vehicle devices 17 and 18 is limited based on the operation of the non-traveling on-vehicle devices 15 and 16 being limited. You can grasp that. For this reason, the user can take some countermeasures before the operation of the traveling in-vehicle devices 17 and 18 is restricted. Therefore, it is possible to prevent the operation of the traveling on-vehicle devices 17 and 18 from being restricted.

  (4) For example, when the supply of power to the plurality of in-vehicle devices 15 to 18 is interrupted and the operations of the in-vehicle devices 15 to 18 are individually restricted, the power line between the in-vehicle battery 12 and each of the in-vehicle devices 15 to 18 is connected. Since it is necessary to block individually, the system configuration becomes complicated, and the attachment to the vehicle 10 becomes complicated. According to this Embodiment, the switch apparatus 19 is connected via the bus | bath B with the some control means which controls operation | movement of the vehicle equipment 15-18. And the operation | movement of the vehicle equipment 15-18 is restrict | limited by communication between the vehicle equipment 15-18. For this reason, compared with the case where the supply of power to the plurality of in-vehicle devices 15 to 18 is cut off and the operations of the in-vehicle devices 15 to 18 are individually restricted, wiring becomes easier and the system configuration is simplified. It can be easily attached to the vehicle 10.

  (5) The power supply monitoring unit 41 is provided in the switch device 19. As described above, the power supply monitoring unit 41 is provided in the switch control ECU 19a of the switch device 19 normally provided in the vehicle 10 corresponding to the in-vehicle device, so that the power supply monitoring device is mounted on the vehicle 10 without increasing the number of buses B. This makes it possible to reduce the cost required for this type of communication line.

In addition, you may change this Embodiment as follows.
-In above-mentioned embodiment, although the power supply monitoring part 41 of the switch apparatus 19 restricted those operation | movement by stopping the vehicle equipment 15-18, it restrict | limits so that the power consumption of the vehicle equipment 15-18 falls. If it does, you may continue operation | movement of these vehicle equipment 15-18.

  -In above-mentioned embodiment, although the power supply monitoring part 41 was provided in switch control ECU19a of the switch apparatus 19, it is not limited to such an aspect, For example, the audio apparatus 15, the air conditioner apparatus 16, the wiper apparatus 17, and the lighting apparatus 18 The power supply monitoring unit 41 may be provided in any of the control ECUs 15a to 18a. If the power monitoring unit 41 is provided in the control ECUs 15a to 18a of the in-vehicle devices connected to the in-vehicle devices 15 to 18 through the bus B in this way, the power supply monitoring is performed on the vehicle 10 without adding a new communication line. The device can be installed.

  Further, for example, as shown in FIG. 4, a power monitoring device 50 including a power monitoring ECU 50 a and a voltage sensor 50 b may be provided separately from the switch device 19 and the in-vehicle devices 15 to 18. In this case, a new communication line is added to connect each of the in-vehicle devices 15 to 18 and the power supply monitoring device 50.

  In the above embodiment, when the remaining capacity of the in-vehicle battery 12 decreases, the operation of the non-traveling in-vehicle devices such as the audio device 15 and the air conditioner 16 is changed to the operation of the traveling in-vehicle devices such as the wiper device 17 and the lighting device 18. Although the restriction is performed earlier than the operation, the order of restricting the operation can be appropriately changed without being limited to such a mode.

The block diagram which shows schematic structure of a vehicle. The block diagram which shows schematic structure of a power supply monitoring system. Explanatory drawing for demonstrating the effect | action of a power supply monitoring system. The block diagram which shows schematic structure of the power supply monitoring system of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 15 ... Audio device as non-traveling vehicle-mounted device, 16 ... Air conditioner device as non-traveling vehicle-mounted device, 17 ... Wiper device as traveling-system vehicle-mounted device, 18 ... Lighting device as traveling-system vehicle-mounted device, DESCRIPTION OF SYMBOLS 19 ... Combination switch apparatus as power supply monitoring device and operation device, 19b ... Wiper switch as operation detection means, 19c ... Light switch as operation detection means, 19d, 50b ... Voltage sensor as remaining amount detection means, 42 ... Memory Memory as means, E ... engine, V1-V4 ... remaining amount judgment value.

Claims (4)

A remaining amount detecting means for detecting a remaining amount of a storage battery serving as a power source when starting the engine of the vehicle;
Storage means for storing a plurality of remaining amount judgment values preset for each of a plurality of in-vehicle devices using the storage battery as a power source,
Each time the remaining amount of the storage battery falls below each remaining amount determination value, the operation of the in-vehicle device corresponding to the remaining amount determination value is limited. The plurality of in-vehicle devices include a traveling-system in-vehicle device that adjusts an environment outside the vehicle compartment related to the traveling of the vehicle, and a non-traveling in-vehicle device that adjusts the environment in the vehicle interior that is not directly related to the traveling of the vehicle,
The remaining amount determination value for restricting the operation of the non-travel in-vehicle device is set higher than the remaining amount determination value for restricting the operation of the traveling in-vehicle device. Power supply monitoring device.   Connected via a communication line to a plurality of control means for controlling the operation of the in-vehicle device, and each time the remaining amount of the storage battery falls below each remaining amount determination value, the in-vehicle corresponding to the remaining amount determination value The power supply monitoring device according to claim 1 or 2, wherein an operation restriction signal for restricting the operation of the device is output to the control device of the in-vehicle device via the communication line. Comprising an operation detecting means for detecting an operation of an operating device corresponding to the in-vehicle device;
The operation request signal for requesting an operation corresponding to the operation is output to the in-vehicle device via the communication line based on a detection result of the operation detection unit. Power monitoring device.

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