JP2009083527A - Power source control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain useless electric power consumption by in-vehicle apparatuses, without impairing convenience of an occupant of a vehicle. <P>SOLUTION: A power source control ECU 10 individually controls power source supply to a load, by turning on corresponding relay circuits 23, 33, 43, 56 and 63 in response to a power source ON request and a power source OFF request from ECU 20, 30, 40, 50 and 60 being a control part of the respective in-vehicle apparatuses. Thus, a power source can be supplied only for a period required for driving its load only to the load of the in-vehicle apparatuses indicated so as to perform desired operation by the occupant of the vehicle. In other words, as long as there is no indication operation by the occupant, since the electric power is not supplied to the load of the in-vehicle apparatuses, the useless electric power consumption by the load can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply control system that supplies power to an in-vehicle device that is mounted on a vehicle and operates in accordance with an instruction operation of a vehicle occupant.

  For example, Patent Document 1 describes a vehicle power window device in which power is supplied to a window driving unit of a power window device as an in-vehicle device only when an occupant is reliably present in the room.

In this vehicle power window device, a signal from a portable device possessed by an occupant is received, and it is determined whether the occupant is present indoors or the occupant is present outdoors. When it is determined that the ignition switch is in the OFF state and the indoor presence state, power is supplied to the window drive unit that moves the window body up and down via the relay circuit.
Japanese Patent Laid-Open No. 2005-120631

  In the above-described vehicle power window device of Patent Document 1, when it is determined that an occupant is present in the passenger compartment, electric power is always supplied to the window drive unit even after the ignition switch is turned off. For this reason, when the occupant tries to operate the power window device, it is not necessary to turn on the ignition switch again, so that convenience for the occupant can be improved.

  However, when the passenger is present in the vehicle compartment but does not intend to operate the power window device, there is a problem that power is wasted in the window driving unit.

  The present invention has been made in view of the above-described points, and provides a power supply control system capable of suppressing wasteful consumption of electric power by in-vehicle devices without impairing the convenience of a vehicle occupant. For the purpose.

In order to achieve the above object, the power supply control system according to claim 1 comprises:
A power supply is provided to an in-vehicle device that is mounted on a vehicle and operates in accordance with an instruction operation of a vehicle occupant,
The in-vehicle device detects an instruction operation input unit to which an instruction operation of a vehicle occupant is input and an instruction operation input to the instruction operation input unit so that the in-vehicle device performs a desired operation. A control unit that generates a control drive signal for performing an operation according to the control unit, and a load unit that is driven and controlled according to a control drive signal from the control unit,
Even after the ignition switch of the vehicle is turned off, power supply means after ignition off for supplying power to the instruction operation input unit and the control unit,
The control unit detects that an instruction operation of the vehicle occupant is input to the instruction operation input unit while power is supplied to the instruction operation input unit and the control unit by the power supply unit after the ignition is turned off. And a first switching means that is turned on based on and supplies power to the load section.

  According to the above-described configuration, even after the ignition switch is turned off, power is supplied to the instruction operation input unit and the control unit, so that the instruction operation by the vehicle occupant can be reliably detected. Therefore, even after the ignition is turned off, the vehicle occupant can perform an instruction operation for instructing a desired operation to the in-vehicle device, and does not impair the convenience of the vehicle occupant. Since power is supplied to the load unit only when an instruction operation by the vehicle occupant is detected, it is possible to prevent wasteful power consumption by the load unit. As a result, it is possible to suppress the wasteful consumption of power by the in-vehicle device as much as possible.

  According to a second aspect of the present invention, a plurality of in-vehicle devices that operate in response to an instruction operation of a vehicle occupant are mounted on the vehicle, and the first switching means corresponds to each load portion of the plurality of in-vehicle devices. It is preferable to provide a plurality. Thus, by providing the plurality of first switching means so as to correspond to the respective load units of the plurality of in-vehicle devices, it becomes possible to supply power independently to the individual load units. Therefore, even if multiple in-vehicle devices that can operate after the ignition is turned off, power can be supplied to the load unit of each in-vehicle device only when necessary to the required load unit, which increases power consumption. Can be suppressed as much as possible.

  According to a third aspect of the present invention, the load unit is connected to a power supply system that is constantly supplied with power through the ignition switch when the ignition switch is turned on, separately from the power supply system in which the first switching means is interposed. It may be connected. When the ignition switch is turned on, the vehicle is most often used for traveling by driving the engine. This is because if the vehicle is running, the battery of the vehicle is normally charged by the generator, so that it is not necessary to pay much attention to power consumption.

  According to a fourth aspect of the present invention, it is preferable that the first switching means is turned off when the operation corresponding to the instruction operation of the vehicle occupant input to the instruction operation input unit is finished. Thereby, when the necessary operation is completed, the power supply to the load unit can be stopped again, so that the power consumption can be further reduced.

  According to a fifth aspect of the present invention, occupant detection means for detecting the presence of an occupant in the passenger compartment is provided, and the power supply after ignition is turned off based on the fact that no occupant is detected in the passenger compartment by the occupant detection means. Preferably, the means stops power supply to the instruction operation input unit and the control unit. This is because if the occupant is not in the passenger compartment, the occupant does not perform an instruction operation for causing the vehicle-mounted device to perform a desired operation.

  According to a sixth aspect of the present invention, there is provided detection means for detecting at least one of the fact that an occupant is approaching the vehicle and the occupant is getting on the vehicle, and the occupant approaches the vehicle by the detection means. It is preferable that the after-ignition-off power supply means starts supplying power to the instruction operation input unit and the control unit on the basis of the fact that at least one of the fact that the passenger has boarded the vehicle is detected. This makes it possible to operate the in-vehicle device before the vehicle occupant turns on the ignition switch.

  According to a seventh aspect of the present invention, the power supply means after the ignition is turned off is inserted into a power supply system that supplies power to the instruction operation input section and the control section and is turned on / off, After the ignition switch is turned off, the second switching means can be turned on to configure the instruction operation input unit and the power supply control unit that supplies power to the control unit.

  When such a configuration is adopted, as described in claim 8, the power supply control unit can be configured to control on and off of the first switching means. That is, the power control unit is communicably connected to the control unit of the in-vehicle device, and the power control unit is configured to supply power to the load unit when the control unit detects an instruction operation of the vehicle occupant with respect to the instruction operation input unit. To instruct. The power supply control unit can supply power to the load unit only when an occupant's instruction operation is performed by turning on the first switching unit in accordance with an instruction from the control unit.

  As described in claim 9, when the operation according to the instruction operation of the vehicle occupant input to the instruction operation input unit is completed, the control unit instructs the power supply control unit to stop the power supply to the load unit. It is preferable to do. In response to this instruction, the power supply control unit can further reduce power consumption in the load unit by turning off the first switching means.

  According to a tenth aspect of the present invention, in addition to the power supply system in which the first switching means is interposed, the load unit is connected to a power supply system that is constantly supplied with power through the ignition switch when the ignition switch is turned on. The control unit includes a determination unit that determines whether or not power is being supplied to the load unit, and the load unit is determined by the determination unit regardless of whether the ignition switch is turned on. When it is determined that power is not supplied to the power supply, the control unit instructs the power supply control unit to supply power to the load unit, and the power supply control unit responds to the instruction with the first switching means. It is preferable to turn on. As a result, even if an abnormality occurs in the power supply system that constantly supplies power to the load section via the ignition switch, and power is not supplied to the load section, power is supplied via the first switching means. Thus, the operation of the load unit can be made possible.

  Hereinafter, a power supply control system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the power supply control system according to the present embodiment.

  As shown in FIG. 1, the power supply control system includes a power supply control ECU 10. This power control ECU 10 mainly controls power supply to various in-vehicle devices such as a power window device, an air conditioner device, a wiper device, an audio device, and a navigation device after an unillustrated ignition (IG) switch is turned off. To do.

  Normally, when the IG switch is turned on to an ignition position or an accessory position, the above-described various in-vehicle devices are operable by being supplied with power via the IG switch. However, for example, after turning off the IG switch and stopping the engine, it may be necessary to operate the power window or the wiper. In such a case, conventionally, it is necessary to operate the power window and the wiper after turning on the IG switch again, and the user's operation is complicated.

  The power control ECU 10 according to the present embodiment supplies power while suppressing power consumption as much as possible to an in-vehicle device that normally stops power supply when the IG switch is turned off. Thereby, even after the occupant of the vehicle turns off the IG switch, the vehicle-mounted device can perform a desired operation without turning on the IG switch again.

  The power supply control ECU 10 has relay circuits 11, 23, 33, 43, 53, 63 so that the power supply control ECU 10 can control the power supply to various in-vehicle devices after the IG switch is turned off. It is connected. Although not shown, a signal from the IG switch is also input to the power supply control ECU 10.

  The relay circuit 11 is interposed between a power source and a power window (P / W) ECU 20, an air conditioner (A / C) ECU 30, a wiper ECU 40, an audio ECU 50, and a navigation ECU 60 that are control units for various in-vehicle devices. It is. The relay circuit 11 includes a relay switch 12 and a relay coil 13. When the relay coil 13 is energized by the power control ECU 10, the relay switch 12 is turned on, and power is supplied to the control units of the various in-vehicle devices.

  When the IG switch is turned on, a power supply path may be provided for supplying power to the control units of various in-vehicle devices via the IG switch. In this case, since power is supplied to the control units of various in-vehicle devices through the power supply path via the IG switch, the relay circuit 11 is turned off when the IG switch is turned on, and the IG switch is turned off. The relay circuit 11 is turned on. Further, without providing such a power supply path, it is possible to always supply power to the control units of various in-vehicle devices via the relay circuit 11.

  The various in-vehicle devices described above include a switch as an instruction operation input unit for inputting an instruction operation of a vehicle occupant. Specifically, the power window device includes a P / W switch 21 for instructing raising / lowering of the power window, and the air conditioner device turns on / off the air conditioner, and instructs a set temperature, an air volume, a wind direction, and the like. / C switch 31, the wiper device includes a wiper switch 41 for temporarily driving the wiper, instructing the wiping speed, and stopping the wiper. The audio device turns the audio device on and off. And an audio switch 51 for selecting an audio source, adjusting a volume, and the like, and the navigation apparatus includes a navigation switch 61 for performing various setting instructions and selection instructions. Power is supplied to these switches 21, 31, 41, 51, 61 via the P / WECU 20, the A / CECU 30, the wiper ECU 40, the audio ECU 50, and the navigation ECU 60, respectively. That is, when the relay switch 12 is turned on and power is supplied to the ECUs 20, 30, 40, 50, 60, power is also supplied to the switches 21, 31, 41, 51, 61 at the same time. The switches 21, 31, 41, 51, 61 may be configured to be supplied with power independently of the power supply to the ECUs 20, 30, 40, 50, 60.

  When the power supply control ECU 10 detects that the IG switch is turned off by a signal from the IG switch, the power control ECU 10 keeps the relay switch 12 of the relay circuit 11 turned on until a predetermined condition is satisfied. Thereby, even after the IG switch is turned off, the control units (ECUs) of the various on-vehicle devices described above perform the instruction operation by the user based on the signals from the switches 21, 31, 41, 51, 61. Can be detected. The predetermined condition for the power supply control ECU 10 to stop power supply will be described later in detail.

  The relay circuits 23, 33, 43, 53, and 63 are connected to the loads of the respective in-vehicle devices, respectively, so that power can be individually supplied to the loads of the in-vehicle devices. That is, the relay circuit 23 is provided between the power source and the power window load (power window motor and its driving circuit) 22, and the power is supplied to the power window load 22 when the relay switch 24 of the relay circuit 23 is turned on. To do. Similarly, the relay circuit 33 is provided between the power source and the A / C load (such as an electric motor that drives the compressor) 32, and the relay circuit 43 is provided between the power source and the wiper load (such as the wiper motor) 42. The relay circuit 53 is provided between a power source and an audio load (a drive circuit, an amplifier or the like corresponding to the audio source) 52, and the relay circuit 63 is connected to a power source and a navigation load (a storage device such as an HDD or a display) 62. It is provided between. Accordingly, when the relay switches 34, 44, 54, 64 of the relay circuits 33, 43, 53, 63 are turned on, power can be supplied independently only to the corresponding load.

  Here, the power supply control ECU 10 is communicably connected to the P / WECU 20, the A / CECU 30, the wiper ECU 40, the audio ECU 50, and the navigation ECU 60, which are control units of various in-vehicle devices, via the in-vehicle LAN 70. When the control unit of the various on-vehicle devices detects an instruction operation of the vehicle occupant by its own switch, it outputs a request to turn on the power of its own load to the power supply control ECU 10 via the in-vehicle LAN 70. Upon receiving this power-on request, the power supply control ECU 10 energizes the corresponding relay coils 25, 35, 45, 55, 65 of the relay circuits 23, 33, 43, 53, 63. Thereby, supply of the load power of the vehicle-mounted device for which the power-on request is issued by the control unit is started, and the vehicle device can execute an operation corresponding to the instruction operation of the occupant.

  When the control unit of various in-vehicle devices performs an operation according to the instruction operation of the occupant and then enters a state where the power supply to the load of the in-vehicle device can be stopped, it issues a power-off request to the power control ECU 10. Output. For example, when the passenger is instructed to raise the power window, when the window glass is raised to the upper end position, the P / WECU 20 considers that the power supply of the P / W load 22 can be stopped and outputs a power-off request. To do. Also in other in-vehicle devices, if the occupant is instructed to perform a predetermined operation and then the occupant is instructed to stop the operation, the power supply can be stopped and a power-off request is output. . Thus, when ending the operation instructed by the occupant, the control unit of each in-vehicle device outputs a power-off request to the power control ECU 10. In response to this power-off request, the power supply control ECU 10 individually turns off each load power supply by stopping energization to the corresponding relay coils 25, 35, 45, 55, 65.

  As described above, the power supply control ECU 10 individually turns on / off the power supply to the corresponding load in response to the power-on request and the power-off request from the control unit of each in-vehicle device. As a result, power is supplied only to the load of the in-vehicle device that is instructed to perform a desired operation by the vehicle occupant for a period in which the load needs to be driven. In other words, power is not supplied to the load of the in-vehicle device unless there is an instruction operation by the occupant, so that wasteful power consumption by the load can be prevented. In addition, even if multiple in-vehicle devices that can operate after the ignition is turned off, power can be supplied to the load of each in-vehicle device only when it is necessary for the required load. Can be suppressed. However, the number of in-vehicle devices that can operate after the ignition is turned off may be only one.

  In addition, when the IG switch is turned on separately from the power supply system that supplies power via the relay circuits 23, 33, 43, 53, and 63 described above, the loads of various in-vehicle devices are powered via the IG switch. Is also connected to the power supply system. Therefore, when the IG switch is on, power is always supplied to the loads of various in-vehicle devices. When the IG switch is turned on, the vehicle is almost actually used for driving by driving the engine. This is because if the vehicle is traveling, the battery of the vehicle is normally charged by a generator (not shown), so that it is not necessary to pay much attention to power consumption.

  Next, the predetermined condition for the power supply control ECU 10 to stop the power supply to the control unit of various in-vehicle devices will be described. The in-vehicle device is operated by the occupant when the occupant is in the passenger compartment. Therefore, an occupant detection device 80 that detects the presence of an occupant in the vehicle interior is provided, and the detection result of the occupant detection device 80 is provided to the power supply control ECU 10. When the occupant detection device 80 detects that there is no occupant in the vehicle compartment, the power control ECU 10 uses the detection result as a predetermined condition to stop the power supply to the control units of various in-vehicle devices. Is preferred. Note that the predetermined condition may be a combination of the fact that the occupant is not in the passenger compartment and other conditions (for example, that a predetermined time has elapsed when the occupant is not in the passenger compartment or the door of the vehicle is locked).

  As the occupant detection device, for example, a portable device and a vehicle-mounted device in a known smart entry system can be used. In the smart entry system, when a vehicle interior transmitter having a vehicle interior as a communication area is provided and a response signal to the vehicle interior transmitter is obtained from the portable device, it is determined that the portable device is present in the vehicle interior. The At this time, even if an occupant goes out of the passenger compartment and tries to lock the door, the door cannot be locked and a warning is given that the portable device has been left in the passenger compartment. In the known smart entry system, in this way, the portable device is prevented from being left behind in the passenger compartment, and thereafter the door cannot be unlocked.

  The smart entry system described above can be used as an occupant detection device because it is possible to detect that an occupant who is a holder of the portable device is in the passenger compartment by communicating with the portable device. In a known smart entry system, the portable device may be inserted into a dedicated slot provided in the vehicle compartment in order to charge the power supply of the portable device. For this reason, it may be detected that the occupant is in the passenger compartment based on the fact that the portable device is inserted into the dedicated slot, regardless of the communication result.

  Further, as the occupant detection device, for example, a seat belt wearing detector that detects whether or not a seat belt is worn, a seating sensor that detects that an occupant is seated on a seat using a pressure sensor, and the situation in the passenger compartment It is possible to use an image processing apparatus including a camera that detects an occupant by photographing the captured image and performing image processing on the captured image. Further, among these occupant detection devices, a plurality of occupant detection devices may be used in any combination. Thereby, it is possible to detect whether or not the occupant is in the passenger compartment more reliably.

  Next, the power supply control performed by the power control ECU when the IG switch is turned off will be described in detail based on the flowchart of FIG. In the process shown in the flowchart of FIG. 2, for example, when the engine is stopped and the door is locked when there is no occupant in the vehicle interior and the predetermined time elapses, or when the occupant opens the door by a smart entry system or the like. For example, when it is detected that the vehicle is separated from the vehicle after being locked, the operation is repeatedly performed every predetermined time until it is considered that the occupant has completely stopped using the vehicle.

  First, in step S110, it is determined whether or not the IG switch is turned off based on a signal from the IG switch. If it is determined that the IG switch is not turned off, the processing shown in the flowchart of FIG. On the other hand, if it is determined that the IG switch is turned off, the process proceeds to step S120.

  In step S120, it is determined based on the detection result of the occupant detection device described above whether the occupant is in the passenger compartment. When the occupant is not in the passenger compartment, it is not necessary to supply power to the in-vehicle device. Therefore, in this case, the processing of the flowchart shown in FIG. In the process of step S120, it may be determined that each door of the vehicle is locked. When the user is not in the passenger compartment and the door is locked, the vehicle occupant can more reliably determine that the vehicle has been used.

  If it is determined in step S120 that the occupant is in the passenger compartment, the process of step S130 is executed. In step S130, the relay coil 13 of the relay circuit 11 is energized and the relay switch 12 is kept on. Thereby, power is supplied to the control units and switches of various in-vehicle devices. In the subsequent step S140, it is determined whether or not a switch operation instructing the occupant to perform a desired operation is performed and a load power-on request is output from the control unit of various in-vehicle devices. At this time, if it is determined that the power-on request has been output based on the communication result with the control unit, the process proceeds to step S150 to supply power to the load corresponding to the control unit that has output the power-on request. The relay coils 25, 35, 45, 55, 65 of the corresponding relay circuits 23, 33, 43, 53, 63 are energized. Thereby, power can be supplied only to the load of the vehicle-mounted device instructed to perform a desired operation by the occupant.

  In subsequent step S160, after performing an operation in accordance with the occupant's instruction operation, the control unit of the in-vehicle device determines that the power supply to the load of the in-vehicle device can be stopped, and controls the in-vehicle device. It is determined whether a power-off request is output from the unit. At this time, if it is determined that the power-off request is output, in step S170, the relay coils 25, 35, 45, 55, and 65 of the corresponding relay circuits 23, 33, 43, 53, and 63 are energized. Stop and stop supplying power to the load. On the other hand, if it is determined that the power-off request has not been output, the process proceeds directly to step S180 without executing step S170.

  In step S180, based on the detection result of the occupant detection device 80, it is determined whether the occupant is not in the passenger compartment and gets off the vehicle. If it is determined that the occupant has not yet got off, the process returns to step S140 so that the switch operation by the occupant can be detected. On the other hand, if it is determined that the occupant has got off the vehicle, the process proceeds to step S190. In this case, since the possibility that the on-board device is operated by the occupant is very low, in step S190, the power supply by all the relay circuits 11, 23, 33, 43, 53, 63 is terminated. In the determination process in step S180, it may be determined together with each door of the vehicle being locked as in the case of step S120. Furthermore, when each door of the vehicle is not locked, for example, it may be determined that a predetermined time has passed since the passenger is no longer detected in the passenger compartment. The crew may forget to lock the door. Even in such a case, it is possible to prevent the power supply to the control unit of each in-vehicle device from being continuously performed by terminating the power supply when a predetermined time has elapsed.

  An example of operation by such power supply control will be described with reference to the time chart of FIG. FIG. 3 shows an operation example when the P / W switch 21 is operated by the occupant after the IG switch is turned off.

  When the P / W switch 21 instructing raising (or lowering) of the window is operated and the switch signal is turned on, the P / WECU 20 detects that the P / W switch 21 has been operated by the passenger. Then, the P / WECU 20 outputs a power-on request to the power control ECU 10. In response to this power-on request, the power supply control ECU 10 energizes the relay coil 25 of the relay circuit 23 corresponding to the P / W load 22. As a result, since power is supplied to the P / W load 22 via the relay switch 24, the P / W load 22 can perform an operation according to the drive control signal from the P / WECU 20.

  In the example shown in FIG. 3, the power window device performs an automatic operation. Once the P / W switch 21 is operated, the load operation is continued until the window reaches the upper end position (or the lower end position). continue. When the load operation by the operation of the P / W switch 21 is completed, the P / WECU 20 outputs a power-off request in order to stop the power supply to the load. In response to this power-off request, the power supply control ECU 10 stops energization to the relay coil 25 of the relay circuit 23. As a result, the relay switch 24 is turned off, and the power supply to the P / W load 22 is stopped.

  Next, the power supply control performed by the power control ECU 10 when the vehicle IG switch is turned off and the vehicle is parked will be described in detail based on the flowchart of FIG. The process shown in the flowchart of FIG. 4 is repeatedly executed, for example, every predetermined time when the IG switch of the vehicle is turned off and the vehicle is parked.

  First, in step S210, it is determined whether the occupant approaches or gets on the vehicle based on the detection result of the occupant detection device 80 described above. Here, in the known smart entry system, when the vehicle is parked, an out-of-vehicle transmitter that periodically transmits an inquiry signal to the outside of the vehicle is provided. When the portable device receives the interrogation signal from the vehicle exterior transmitter, it transmits a response signal in response to the interrogation signal. Therefore, when the vehicle-mounted device receives a response signal that responds to the interrogation signal from the vehicle exterior transmitter, it can be determined that the passenger holding the portable device is approaching the vehicle. The user may determine that the user is approaching the vehicle when the door of the vehicle is unlocked using the smart entry system. Furthermore, it is also possible to determine the occupant's boarding by using an image recognition device equipped with a camera or a seating sensor.

  In step S210, when it is determined that the occupant approaches or gets on the vehicle, in step S220, the relay coil 13 of the relay circuit 11 is energized to supply power to the control units (and switches) of various in-vehicle devices. Is supplied. For this reason, it becomes possible to operate various vehicle-mounted devices before the vehicle occupant turns on the IG switch.

  In addition, before the IG switch is turned on, processing (steps S230 and S240) when an operation instruction for causing the vehicle-mounted device to perform a desired operation is performed by the passenger (steps S230 and S240), and an operation corresponding to the instruction operation of the passenger is performed. Thereafter, the processing (steps S250 and S260) when it becomes possible to stop the power supply to the load of the in-vehicle device is the same as the processing of steps S140 to S170 in the flowchart of FIG. Therefore, explanation is omitted.

  In step S270, it is determined whether or not the IG switch is turned on based on a signal from the IG switch. At this time, if it is determined that the IG switch is turned on, the process proceeds to step S280, and all the relay circuits 23, 33, 43, 53, and 63 that individually supply power to the loads are turned off. This is because when the IG switch is turned on, power is supplied to each load via the IG switch. On the other hand, if it is determined in step S270 that the IG switch has not been turned on, the process proceeds to step S290.

  In step S290, based on the detection result of the occupant detection device 80, it is determined whether the occupant has got off the vehicle. At this time, if it is determined that the occupant has got off the vehicle, the process proceeds to step S300. In step S300, power supply by all the relay circuits 11, 23, 33, 43, 53, 63 is terminated. On the other hand, if it is determined in step S290 that the occupant has not got off the vehicle, the processing from step S230 is repeated.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the power supply control ECU 10 is configured to control the relay circuits 23, 33, 43, 53, and 63 that turn on and off the power supply to the loads of various in-vehicle devices. , 33, 43, 53, 63 may be controlled by the control unit of the corresponding in-vehicle device. That is, the control unit of various in-vehicle devices starts supplying power to its own load or determines when to stop the supply, and the relay circuits 23, 33, 43, The on / off states of 53 and 63 can be appropriately controlled.

  Further, as described above, the loads of various in-vehicle devices are connected to a power supply system to which power is supplied via the IG switch when the IG switch is turned on. However, there may be a situation in which power is not supplied to the load due to some abnormality in the power supply system such as disconnection. In such a case, in the above-described embodiment, since a power supply system that can supply power individually to loads of various in-vehicle devices is provided separately from the power supply system via the IG switch, by using this configuration, The power supply can be continued.

  Specifically, the control unit of the in-vehicle device monitors the power supply to the load, or monitors the operation of the load when a control drive signal is given to the load, so that the power is normally supplied to the load. It is determined whether or not. When it is determined that power is not supplied to the load even though the IG switch is on, a power-on request is output to the power control ECU 10. Then, the power supply control ECU 10 supplies power to the load via the relay circuits 23, 33, 43, 53, and 63. As a result, even if some abnormality occurs in the power supply system that supplies power to the load via the IG switch and power is not supplied to the load, power can be supplied via the relay circuit. Can be made possible.

  Further, the relay circuit described above may be replaced with, for example, a semiconductor power switching element.

It is a block diagram which shows the whole structure of the power supply control system by embodiment. It is a flowchart which shows the flow of the power supply control performed by power supply control ECU, when an IG switch is turned off. 3 is a time chart for explaining an operation example by power supply control shown in the flowchart of FIG. 2. It is a flowchart which shows the flow of the power supply control performed by power supply control ECU, when the IG switch of a vehicle is turned off and the vehicle is parked.

Explanation of symbols

10. Power control ECU
11, 23, 33, 43, 53, 63 ... relay circuits 12, 24, 34, 44, 54, 64 ... relay switches 13, 25, 35, 45, 55, 65 ... relay coil 20 ... P / WECU
21, 31, 41, 51, 61 ... switch 22 ... P / W load 30 ... A / CECU
32 ... A / C load 40 ... Wiper ECU
42 ... Wiper load 50 ... Audio ECU
52 ... Audio load 60 ... Navi ECU
62 ... Navi load 80 ... Crew detection device

Claims (10)

A power supply control system that supplies power to an in-vehicle device that is mounted on a vehicle and operates according to an instruction operation of a vehicle occupant,
The in-vehicle device detects an instruction operation input unit to which an instruction operation of an occupant of a vehicle is input and an instruction operation input to the instruction operation input unit in order to cause the in-vehicle device to perform a desired operation. A control unit that generates a control drive signal for performing an operation according to an instruction operation, and a load unit that is driven and controlled according to a control drive signal from the control unit,
Even after the ignition switch of the vehicle is turned off, power supply means after ignition off for supplying power to the instruction operation input unit and the control unit,
The controller detects that an instruction operation of a vehicle occupant has been input to the instruction operation input unit while power is being supplied to the instruction operation input unit and the control unit by the power supply means after the ignition is turned off. And a first switching means that is turned on based on the power supply and supplies power to the load section.   A plurality of in-vehicle devices that operate in response to an instruction operation of a vehicle occupant are mounted on the vehicle, and a plurality of the first switching means are provided corresponding to respective load portions of the plurality of in-vehicle devices, The power supply control system according to claim 1, wherein power can be supplied to each unit independently.   The load section is connected to a power supply system that is always supplied with power through the ignition switch when the ignition switch is turned on, separately from the power supply system in which the first switching means is interposed. The power supply control system according to claim 1.   2. The power supply control system according to claim 1, wherein the first switching unit is turned off when an operation corresponding to an instruction operation of a vehicle occupant input to the instruction operation input unit is finished. . Occupant detection means for detecting the presence of an occupant in the passenger compartment,
The power supply means after the ignition is turned off to stop the power supply to the instruction operation input unit and the control unit based on the fact that the passenger detection unit detects that there is no passenger in the vehicle interior. Item 4. The power supply control system according to Item 1. Detecting means for detecting at least one of an approaching occupant to the vehicle and an occupant getting on the vehicle;
On the basis of the detection means detecting at least one of the fact that an occupant is approaching the vehicle and the occupant getting on the vehicle, the power supply means after the ignition is turned off is the instruction operation input unit. The power supply control system according to claim 1, wherein power supply to the control unit is started.   The power supply means after the ignition is turned off is inserted into a power supply system that supplies power to the instruction operation input section and the control section, and the second switching means that is turned on / off, and the ignition switch of the vehicle is turned off. And a power control unit that turns on the second switching means and supplies power to the instruction operation input unit and the control unit. The power supply control system described.   The power supply control unit is communicably connected to the control unit of the in-vehicle device. When the control unit detects an instruction operation of a vehicle occupant with respect to the instruction operation input unit, the power supply control unit supplies power to the load unit. The power supply control system according to claim 7, wherein the power supply control unit is instructed to perform, and the power supply control unit turns on the first switching unit in response to the instruction.   When the operation according to the instruction operation of the vehicle occupant input to the instruction operation input unit is completed, the control unit instructs the power supply control unit to stop power supply to the load unit, and The power supply control system according to claim 8, wherein the power supply control unit turns off the first switching unit. The load section is connected to a power supply system to which power is always supplied via the ignition switch when the ignition switch is turned on, separately from the power supply system in which the first switching means is interposed. There,
The control unit includes a determination unit that determines whether power is supplied to the load unit,
When the determination unit determines that power is not supplied to the load unit even though the ignition switch is turned on, the control unit performs power supply to the load unit. The power supply control system according to claim 8, wherein the power supply control unit is instructed, and the power supply control unit turns on the first switching unit in response to the instruction.

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