JP5130694B2 - Power storage device used for vehicle power supply device and vehicle power supply device - Google Patents

Description

The present invention relates to a power storage device used for a vehicle power supply device having an auxiliary power supply function for supplying power from a power storage unit when a voltage of a main power supply is lowered , and a vehicle power supply device .

  In recent years, a vehicle having an idling stop function has been developed from the viewpoint of environmental protection in order to reduce exhaust gas and suppress fuel consumption during idling of an automobile (hereinafter referred to as a vehicle). In this idling stop vehicle, the starter is operated when the idling stop is completed and the engine is restarted. However, since a large current flows through the starter, the battery voltage temporarily decreases. As a result, power to loads such as audio and car navigation is temporarily interrupted, and there is a problem that music is interrupted and the destination setting of the car navigation is erased and needs to be reset.

  On the other hand, for example, Patent Document 1 proposes a vehicle power supply device as an auxiliary power supply for supplying sufficient power to a load when a voltage of a battery temporarily drops. FIG. 6 is a block circuit diagram of such a vehicle power supply device. The power supply circuit 101 is provided with an auxiliary power supply unit 103 composed of an electric double layer capacitor in order to store auxiliary power. A charging circuit 105 is connected to the auxiliary power supply unit 103. A stabilization circuit 107 that outputs power from the auxiliary power supply unit 103 is also connected. A detection circuit 109 for detecting the voltage is connected to the input side of the charging circuit 105. In addition, a power supply switching unit 111 that switches whether to supply power from the auxiliary power supply unit 103 according to the detection voltage of the detection circuit 109 is connected.

  The main power supply unit 115 made of a battery is connected to the input side of the power supply circuit 101, that is, the input of the charging circuit 105 through the first switch 113. One end of the second switch 117 is connected between the first switch 113 and the power supply circuit 101, and the other end is connected to a starter built in the engine 119. The first switch 113 and the second switch 117 are on / off controlled by the key mounting unit 121. The key mounting unit 121 has four modes: a lock mode, an accessory mode, an on mode, and a start mode. In the lock mode, both the first switch 113 and the second switch 117 are turned off. In the accessory mode and the on mode, the first switch 113 is turned on and the second switch 117 is turned off. In the start mode, both the first switch 113 and the second switch 117 are turned on. In addition, an in-vehicle device 123 such as audio or car navigation is connected to the output side of the power supply circuit 101, that is, the output of the power supply switching unit 111.

  Next, the operation of the vehicle power supply device will be described. First, when a key is inserted into the key mounting portion 121 and the accessory mode is set, the first switch 113 is turned on. As a result, the power of the main power supply unit 115 is supplied to the charging circuit 105, the detection circuit 109, and the power supply switching unit 111. Thereby, the charging circuit 105 charges the auxiliary power supply unit 103 and the power supply switching unit 111 selects the main power supply unit 115 side as shown in FIG. Audio, car navigation, etc. operate.

  In this state, when the key of the key mounting part 121 is set to the start mode in order to start the engine, the second switch 117 is also turned on. As a result, the power of the main power supply unit 115 is supplied to the starter built in the engine 119, and the engine starts. At this time, since a large current flows through the starter, the voltage of the main power supply unit 115 greatly decreases accordingly. When this change is detected by the detection circuit 109 and detected to be lower than a predetermined reference value, the power supply switching unit 111 is switched to the auxiliary power supply unit 103 side. Thereby, since electric power is supplied from the auxiliary power supply unit 103 to the in-vehicle device 123 during the starter operation, the in-vehicle device 123 can continue to operate.

  Thereafter, the start of the engine 119 is completed, and the second switch 117 is turned off by setting the key to the on mode. As a result, the voltage of the main power supply unit 115 becomes higher than a predetermined reference value. Therefore, the detection circuit 109 detects this change and switches the power supply switching unit 111 to the main power supply unit 115 side. Thereby, electric power is supplied to the in-vehicle device 123 from the main power supply unit 115.

  Next, a case where the idling stop state is reached will be described. In the idling stop state, although the engine 119 stops, the voltage of the main power supply unit 115 is higher than a predetermined reference value, so the power supply switching unit 111 continues to select the main power supply unit 115 side. As a result, the power of the main power supply unit 115 is supplied to the in-vehicle device 123.

  When the idling stop state is finished in this state and the engine 119 is restarted, the starter built in the engine 119 operates, so that the voltage of the main power supply unit 115 becomes lower than a predetermined reference value. Thereby, as described above, the power supply switching unit 111 selects the auxiliary power supply unit 103 side, and the power of the auxiliary power supply unit 103 is supplied to the in-vehicle device 123. As a result, the in-vehicle device 123 can be kept operating even during the starter operation after the idling stop.

With the above operation, the in-vehicle device 123 is continuously supplied with stable power even during the starter operation, and it is possible to avoid interruption of music, deletion of settings, and the like.
JP 2002-64946 A

  According to the vehicle power supply device described above, it is possible to continue driving the vehicle-mounted device 123 even when the voltage of the main power supply unit 115 drops due to the starter operation. Continued supply had the following problems. In the conventional configuration, the in-vehicle device 123 continues to operate even when the vehicle is first activated from the vehicle non-use state (at the time of initial activation) by setting the key of the key mounting unit 121 to the start mode. If the key is set to the accessory mode immediately after the key is set to the accessory mode, the auxiliary power supply unit 103 may not be sufficiently charged and the operation of the in-vehicle device 123 may not be continued. That is, the in-vehicle device 123 may or may not operate depending on the state of charge of the auxiliary power supply unit 103, so that the driver may misrecognize that the power supply system, the in-vehicle device 123, or the like is out of order. There was a problem that there was.

  Further, in the conventional configuration, when the key is set to the lock mode and the use of the vehicle is finished (when the vehicle is not in use), the first switch 113 is turned off to cause the detection circuit 109 to decrease the voltage of the main power supply unit 115. Is recognized, and an operation of continuously supplying power from the auxiliary power supply unit 103 to the in-vehicle device 123 is assumed. However, if the operation is performed in this manner, the vehicle-mounted device 123 will continue to operate despite the key being set to the lock mode for the driver. There was a problem that could be recognized.

The present invention solves the above-described conventional problems, and provides a highly reliable power storage device and vehicle power supply device that reduce the possibility of erroneous recognition of a failure when the vehicle is initially started or when the vehicle is not in use. For the purpose.

In order to solve the conventional problem, a power storage device according to the present invention includes a power storage unit that stores power of a main power source, and when the voltage (Vb) of the main power source is equal to or lower than a threshold value, A power storage device used for a vehicle power supply device having an idling stop function, wherein the vehicle power supply device includes the main power supply, a lock mode, an accessory mode, an on mode, and a start Vehicle power switch for switching the power supply destination of the main power source having a mode,
When the control circuit first enters a vehicle start-up state from a vehicle non-use state in the lock mode , the power storage device prohibits power supply from the power storage unit to the load, and the starter after idling stop The power supply from the power storage unit to the load is permitted during driving and in the on mode after the first vehicle activation state .
In order to solve the conventional problem, the power storage device of the present invention includes a power storage unit that stores power of a main power source, and the power storage unit when the voltage (Vb) of the main power source is equal to or lower than a threshold value. A power storage device used for a vehicle power supply device, wherein the vehicle power supply device includes the main power supply, a lock mode, an accessory mode, an on mode, and a start mode. And a vehicle power switch for switching a power supply destination of the main power source, and the control circuit supplies power from the power storage unit to the load when the vehicle is first activated from a vehicle non-use state in the lock mode. When the vehicle power switch enters the start mode, power supply to the load supplied from the main power supply is cut off .

According to the present invention, since the power storage device does not supply power from the power storage unit to the load when the vehicle is first activated from the non-use state of the vehicle, there is a possibility of erroneous recognition of the driver's failure when using the vehicle. An effect that a highly reliable vehicle power supply device that reduces the above can be realized.
Further, when the key is set to the start mode, the on-vehicle power supply 123 is turned off. As a result, even if the vehicle is an idling stop vehicle, the on-vehicle power supply 123 performs a start-up operation equivalent to that of a general vehicle. Therefore, it is highly reliable to reduce the possibility of driver misrecognition when using the vehicle. The effect that a vehicle power supply device can be realized is obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a block circuit diagram of a vehicle power supply device according to an embodiment of the present invention. FIG. 2 is a flowchart showing operations of the vehicle-side control circuit and the power storage device control circuit when the vehicle power supply device according to the embodiment of the present invention first enters the vehicle starting state from the vehicle non-use state. FIG. 3 is a flowchart showing an abnormality detection operation of the accessory power supply system of the vehicle power supply device according to the embodiment of the present invention. FIG. 4 is a flowchart showing a disconnection detection operation to the load of the vehicle power supply device according to the embodiment of the present invention. FIG. 5 is a flowchart showing operations of the vehicle-side control circuit and the power storage device control circuit when the vehicle power supply device according to the embodiment of the present invention changes from the vehicle use state to the vehicle non-use state. In FIG. 1, thick lines indicate power system wirings, and thin lines indicate signal system wirings.

  In FIG. 1, a power storage device 13 for storing the power of the main power supply 11 is connected to a main power source 11 made of a battery, and the output of the power storage device 13 is a load (hereinafter referred to as an audio, navigation, audiovisual navigation, etc.). Accessory load 15) is connected. Here, a generator 17 that generates electric power by driving an engine (not shown) is connected to the main power supply 11, whereby the main power supply 11 is charged.

  The main power supply 11 is connected to a vehicle power switch 19 that selects a power supply destination by a key operation. Thereby, the electric power of the main power supply 11 is supplied to the load in the vehicle. The vehicle power switch 19 has four modes, a lock mode, an accessory mode, an on mode, and a start mode, as in the conventional case. Accordingly, the vehicle power switch 19 selects any one or more of the accessory output terminal 191, the ON output terminal 192, and the start output terminal 193 corresponding to these modes, and outputs power. The details are as follows.

  The lock mode is a mode in which all the outputs of the vehicle power switch 19 are turned off. Thereby, the power supply to the power storage device 13 and all loads is cut off. The accessory mode is a mode in which power is supplied only to the accessory output terminal 191 among the output terminals of the vehicle power switch 19. Therefore, the accessory load 15 is connected to the accessory output terminal 191 via the power storage device 13 as described above. The on mode is a mode in which power is supplied to the accessory output terminal 191 and the on output terminal 192 among the output terminals of the vehicle power switch 19. Accordingly, by setting the on mode, power is supplied to the accessory load 15, all loads connected to the on output terminal 192 (hereinafter referred to as the on load 21), and the power storage device 13. The start mode is a mode in which power is supplied to the ON output terminal 192 and the start output terminal 193 among the output terminals of the vehicle power switch 19. Therefore, by setting the start mode, electric power is supplied to the on-load 21, the power storage device 13, and the starter 23 that starts the engine. At this time, since the accessory output terminal 191 is turned off, the power supply to the accessory load 15 is stopped. Accordingly, when the accessory mode is changed from the lock mode to the accessory mode, the accessory output terminal 191 is turned on. However, when the driver sets the vehicle power switch 19 in the start mode for the start of the starter 23, that is, when the starter 23 is driven. In order to preferentially supply the power of the main power supply 11 to the power supply 23, the accessory output terminal 191 is turned off.

  The starter 23 can be driven by a starter switch 25 in addition to the start mode of the vehicle power switch 19. The starter switch 25 is used when the idling stop state is finished and the engine is restarted, and the on / off control is performed by the vehicle-side control circuit 27.

  The vehicle-side control circuit 27 is composed of a microcomputer and controls various vehicles. Here, only functions necessary for the present embodiment will be described. That is, in addition to generating the starter signal STon indicating on / off of the starter switch 25 described above, the accessory voltage detection circuit 29 for detecting the voltage of the accessory power supply system (hereinafter referred to as the accessory voltage Vac) output from the accessory output terminal 191. Is connected. As a result, the vehicle-side control circuit 27 takes in the accessory voltage Vac. Further, an on-voltage detection circuit 30 for detecting a voltage output from the on-output terminal 192 (hereinafter referred to as on-voltage Von) is connected. As a result, the vehicle-side control circuit 27 takes in the on-voltage Von. In addition, the vehicle-side control circuit 27 inputs and outputs various data using the power storage device 13 and the input signal in and the output signal out.

  Next, a detailed configuration of the power storage device 13 will be described.

  The power storage device 13 incorporates a power storage unit 31 for storing power to be supplied to the accessory load 15 after idling is stopped. Here, the electric storage unit 31 is an electric double layer capacitor capable of rapid charge / discharge.

  The power storage unit 31 is charged with the power of the main power supply 11. For this purpose, a charging circuit 33 is connected between the main power supply 11 and the power storage unit 31. On the other hand, discharging of the power of the power storage unit 31 to the accessory load 15 is performed by the discharge switch 35.

  Since the accessory load 15 is connected to the voltage Vab supplied directly from the main power supply 11 and the voltage Vaa supplied from the accessory power supply system via the backflow prevention diode 37, the output of the discharge switch 35 is connected. Are also divided into two systems and are connected to the accessory load 15 via a diode 39 for preventing backflow.

  The power storage device 13 is connected to a voltage detection circuit 41 for switching and detecting any one of the voltages Vaa and Vab and the voltage Vb of the main power supply 11. When the voltage detection circuit 41 receives the voltage selection signal SLV for selecting which voltage to detect, the voltage detection circuit 41 detects a voltage corresponding to the voltage selection signal SLV and transmits the voltage signal Vin.

  The voltage selection signal SLV and the voltage signal Vin are communicated with the control circuit 43. The control circuit 43 is composed of a microcomputer and performs communication with the vehicle side control circuit 27 and control of the charging circuit 33 and the discharge switch 35 in addition to communication with the voltage detection circuit 41. The charging control of the charging circuit 33 is performed by the control signal cont, and the on / off control of the discharging switch 35 is performed by the discharging switch signal VOF. The charging circuit 33 has a function of detecting the voltage Vc of the power storage unit 31 and transmitting it to the control circuit 43.

  Driving power for the voltage detection circuit 41 and the control circuit 43 is supplied from a regulator 45. The regulator 45 converts the input voltage into a constant voltage (for example, DC 5 V) and outputs the voltage, and the power input to the regulator 45 is configured to be supplied from the main power supply 11 or the power storage unit 31. That is, the power of the main power supply 11 is normally input from the on-mode output of the vehicle power supply switch 19 to the regulator 45 via the backflow prevention diode 47, but is stored when the voltage of the main power supply 11 drops after the idling stop. The power of the unit 31 is input to the regulator 45 via the diode 47. With such a configuration, the voltage detection circuit 41 and the control circuit 43 can continue to operate even when the starter 23 is driven after the idling stop.

  Next, the operation of such a vehicle power supply device will be described.

  First, the operation of the vehicular power supply device during the driving of the starter 23 after idling stop is the same as the conventional one. That is, the power storage device 13 continues to monitor the voltage Vb of the main power supply 11 with the voltage detection circuit 41, and the voltage Vb is driven by the starter 23 so that the voltage Vb is a threshold (for example, 10.5 V, which is the lower limit voltage that the accessory load 15 can drive) ) When it is detected that the power has decreased below, an operation for permitting power supply from the power storage unit 31 to the accessory load 15 is performed. Specifically, the control circuit 43 transmits a discharge switch signal VOF for turning on the discharge switch 35 to the discharge switch 35. As a result, the discharge switch 35 is turned on, and power is supplied from the power storage unit 31 to the accessory load 15 via the discharge switch 35 and the diode 39. As a result, the accessory load 15 can continue to operate even when the starter 23 is driven. At this time, since the voltage Vb of the main power supply 11 is lowered to about 6 V, for example, the anode side voltage of the diode 37 is also lowered. Therefore, even when the discharge switch 35 is turned on and power is supplied from the power storage unit 31, the diode 37 is turned off, so that no current flows backward from the power storage unit 31 to the main power supply 11.

  Next, operations that characterize the present embodiment will be described with reference to FIGS.

  First, an operation when the vehicle is first activated from the vehicle non-use state will be described. In order to use the vehicle, the driver switches the vehicle power switch 19 from the lock mode to the accessory mode. As a result, an accessory mode switch (not shown) built in the vehicle power switch 19 is turned on, and the accessory power supply system power is supplied from the accessory output terminal 191 to the accessory load 15 via the diode 37 provided in the power storage device 13. Is supplied and the accessory load 15 is activated.

  Thereby, since the accessory voltage Vac is applied to the accessory voltage detection circuit 29, the vehicle-side control circuit 27 outputs the output of the accessory voltage detection circuit 29, that is, the accessory voltage Vac is a predetermined value (in the present embodiment, the threshold voltage). It is determined whether or not the vehicle power switch 19 has been switched to the accessory mode (step number S1). If it is not switched to the accessory mode (No in S1), the process returns to S1 again to continue the determination of switching to the accessory mode.

  On the other hand, if it is determined that the mode has been switched to the accessory mode (Yes in S1), the vehicle-side control circuit 27 detects that the vehicle is first activated from the vehicle non-use state (initial activation state). Thereafter, it is determined whether or not the driver has turned on the vehicle power switch 19 (S3). This is because whether or not the vehicle power switch 19 has been switched to the on mode by comparing whether or not the output of the on voltage detection circuit 30, that is, the on voltage Von is a predetermined value (same as above, 10.5V). Judgment is made (S3). If the vehicle power switch 19 is not in the on mode (No in S3), the process returns to S3 until the on mode is entered. If the on mode is entered (Yes in S3), power is supplied from the on output terminal 192, so that the regulator 45 outputs the voltage Vcc via the diode 47. As a result, power is supplied to the voltage detection circuit 41 and the control circuit 43, so that the power storage device 13 is activated. As a result, the control circuit 43 starts to operate, details of which will be described later.

  When the vehicle power switch 19 enters the on mode, the vehicle-side control circuit 27 transmits a signal indicating the initial activation state to the control circuit 43 of the power storage device 13 by the output signal out (S5).

  With the above operation, the initial startup operation of the vehicle-side control circuit 27 related to the power storage device 13 is completed. In conjunction with this operation, the control circuit 43 of the power storage device 13 performs the following initial startup operation. The interlocked operation part is indicated by a dotted arrow in FIG.

  First, when the vehicle power switch 19 is turned on in S3 in FIG. 2, the power storage device 13 is activated as described above, and the operation of the control circuit 43 is started. Thereafter, an initial activation signal is transmitted from the vehicle side control circuit 27 in S5, and is received by the input signal in of the control circuit 43 (S31). As a result, the control circuit 43 knows that the vehicle has been activated first from the non-use state of the vehicle, so that the discharge switch 35 is set so that the power storage device 13 prohibits power supply from the power storage unit 31 to the accessory load 15. Is turned off (S33). In this way, the control circuit 43 ends the initial startup operation.

  Thereafter, when the driver sets the vehicle power switch 19 in the start mode to drive the starter 23 to start the engine, the accessory mode switch is turned off, giving priority to power supply to the starter 23. Thus, when the engine speed exceeds the threshold value, the engine start is completed, and the accessory mode switch is turned back on.

  By operating the power storage device 13 as described above, the power supply from the power storage unit 31 to the accessory load 15 is prohibited when the vehicle is first activated after the vehicle is not in use, so the vehicle power switch 19 is started. When the mode is set, the accessory load 15 is turned off. As a result, the accessory load 15 does not operate or not depending on the amount of power stored in the power storage unit 31 at the initial startup. Therefore, it is possible to reduce the possibility of the driver's misrecognition to the failure of the power supply system and the accessory load 15, and to obtain a highly reliable vehicle power supply device.

  The accessory voltage detection circuit 29 may be provided in the power storage device 13. In this case, since the electric power is supplied to the power storage device 13 when the vehicle power switch 19 is switched to the on mode, the control circuit 43 takes in the output signal of the accessory voltage detection circuit 29 at that time, and the accessory voltage Vac is a predetermined value (10 .5V) or more, it is determined that the vehicle is first activated since the vehicle is not used. Thereby, the discharge switch 35 is controlled. With such a configuration, the function of the accessory voltage detection circuit 29 can be built in the voltage detection circuit 41, so that a simpler configuration can be achieved.

  Next, an abnormality detection operation of the accessory power supply system when the vehicle is used will be described with reference to FIG. This operation may be arbitrarily executed when the vehicle is used, or may be executed at a time when the power supply source to the accessory load 15 is switched, for example, at the end of idling stop. Here, the description will be made assuming that the flowchart of FIG.

  When the vehicle-side control circuit 27 starts the abnormality detection operation, first, the accessory voltage detection circuit 29 detects the accessory voltage Vac, and determines whether or not it is in an off state (S45). Here, the determination of the OFF state is made based on whether or not the accessory voltage Vac has become a predetermined value or less. The predetermined value is the lower limit voltage (for example, 10.5 V) that can drive the accessory load 15 in the same manner as the above-described threshold value.

  If the accessory voltage Vac remains off (Yes in S45), it is determined whether or not a predetermined time has elapsed (S47). Here, the predetermined time is about 1 second. If the predetermined time has not elapsed (No in S47), the process returns to S45 again. When the predetermined time elapses (Yes in S47), the accessory voltage Vac is in an off state for a predetermined time or more, so an abnormality in the accessory power supply system of the vehicle power switch 19 and its peripheral wiring is assumed. Accordingly, an abnormality signal is output to warn the driver of abnormality of the accessory power supply system and prompt repair (S49). By this operation, an abnormality as a vehicle power supply device can be accurately warned, so that high reliability can be obtained.

  On the other hand, if the accessory voltage Vac is not in the off state within the predetermined time (No in S45), the accessory power supply system is normal and the subroutine is terminated.

  Next, the disconnection detection operation to the load when the vehicle is used will be described with reference to FIG. This operation may be arbitrarily executed when the vehicle is used, or may be executed at a time when the power supply source to the accessory load 15 is switched, for example, at the end of idling stop. Here, the description will be made assuming that the flowchart of FIG.

  When the control circuit 43 of the power storage device 13 starts the disconnection detection operation, first, the voltage detection circuit 41 is controlled to detect the input voltages Vaa and Vab supplied to the accessory load 15. The power supply source to the accessory load 15 at this time may be the main power supply 11 or the power storage unit 31. Next, it is determined whether or not the voltages Vaa and Vab are in the off state (S51). Here, the determination of the off state is made based on whether or not the voltages Vaa and Vab are less than or equal to a predetermined value. The predetermined value was 9.8 V, which is a lower limit voltage at which the accessory load 15 can be operated. The predetermined value in S45 of FIG. 3 is 10.5V, but this is a predetermined value for the accessory voltage Vac, and a diode 37 is connected between the accessory voltage Vac and the input voltage Vab to the accessory load 15. Therefore, the predetermined value in S51 was set to 9.8V by subtracting the voltage drop (0.7V) due to this. This predetermined value is the same 9.8 V in both the input voltage Vaa to the accessory load 15 for the main power supply Vb and the input voltages Vaa and Vab to the accessory load 15 for the voltage Vc of the power storage unit 31.

  In S51, if neither of the input voltages Vaa and Vab to the accessory load 15 is in an off state (No in S51), the input voltages Vaa and Vab to the accessory load 15 are normal, so the subroutine is terminated as it is.

  On the other hand, if it is an off state (Yes of S51), it will be judged whether predetermined time passed (S53). The predetermined time is 1 second as in S5 of FIG. If the predetermined time has not elapsed (No in S53), the process returns to S51 again, and it is determined whether or not the input voltages Vaa and Vab to the accessory load 15 are off until the predetermined time has elapsed. When the predetermined time elapses (Yes in S53), the input voltages Vaa and Vab supplied to the accessory load 15 are in an off state for a predetermined time or more, so the main power supply 11 and the power storage unit 31 to the accessory load 15 It can be seen that the power system wiring is disconnected. Therefore, the control circuit 43 outputs a disconnection signal to the vehicle-side control circuit 27 (S55) and ends the subroutine. In response, the vehicle-side control circuit 27 warns the driver of the disconnection and prompts repair. Thereby, high reliability is obtained as a power supply device for vehicles.

  Next, the operation when the use of the vehicle is finished and the vehicle is not used will be described with reference to FIG. Note that the operation in FIG. 5 is periodically executed by, for example, an interrupt process or the like because it is not known when the use of the vehicle is terminated. Therefore, description will be made assuming that the flowchart of FIG. 5 is a subroutine.

  When the subroutine of the vehicle-side control circuit 27 shown in FIG. 5 is executed, first, an end flag indicating that the use of the vehicle has ended is cleared (S70).

  Next, when the use of the vehicle is finished, the driver switches the vehicle power switch 19 from the on mode to the accessory mode or the lock mode, so that the on output terminal 192 of the vehicle power switch 19 is turned off. Accordingly, the vehicle-side control circuit 27 determines whether or not the vehicle power switch 19 has been switched from the on mode to the accessory mode or the lock mode based on whether or not the output of the on-voltage detection circuit 30 has been turned off (S71). . If it has not been switched (No in S71), since the vehicle is in use, the subroutine is terminated as it is.

  On the other hand, if it has switched (Yes of S71), an end signal will be transmitted to the control circuit 43 of the electrical storage apparatus 13 (S73). Thereafter, the end flag is turned on (S75), and the subroutine is ended. Thereby, although not shown, the end of use of the vehicle can be known by checking the end flag in the main routine of the vehicle side control circuit 27.

  With the above operation, the vehicle use end determination operation of the vehicle side control circuit 27 related to the power storage device 13 is completed. In conjunction with this operation, the control circuit 43 of the power storage device 13 performs the following operation. The interlocked operation part is indicated by a dotted arrow in FIG.

  In FIG. 5, when the vehicle power switch 19 enters the accessory mode or the lock mode in Yes in S <b> 71, the output of the on output terminal 192 is turned off, so that the power of the power storage unit 31 is supplied to the regulator 45. Accordingly, the power storage device 13 can continue to operate. In this state, an end signal is transmitted from the vehicle-side control circuit 27 in S73, and is received by the input signal in of the control circuit 43 (S81). As a result, the control circuit 43 knows that the vehicle usage state has changed to the vehicle non-use state, so the discharge switch 35 is turned off so that the power storage device 13 prohibits the power supply from the power storage unit 31 to the accessory load 15. (S83), and the subroutine is terminated.

  By setting it as such operation | movement, the electric power supply from the electrical storage part 31 to the accessory load 15 is not performed even at the time of the vehicle non-use state which sets the vehicle power switch 19 to accessory mode or lock mode. Therefore, the accessory load 15 does not continue to operate despite the vehicle power switch 19 being in the lock mode, and the possibility of the driver's misrecognition to a failure of the power supply system, the accessory load 15 or the like can be reduced. it can.

  With the above-described configuration and operation, the power supply from the power storage device 13 to the accessory load 15 is prohibited by recognizing when the vehicle is initially started or when the vehicle is not in use. It is possible to realize a highly reliable vehicular power supply device that reduces the reliability.

  In the present embodiment, the power storage element used for power storage unit 31 is configured by an electric double layer capacitor, but another power storage element such as an electrochemical capacitor may be used.

  The power supply device for a vehicle according to the present invention can reduce the possibility of erroneous recognition of a failure by a driver and can obtain high reliability. Therefore, in particular, the auxiliary power supply from the power storage unit when the voltage of the main power supply in the idling stop vehicle is lowered. It is useful as a vehicle power supply device for power supply.

1 is a block circuit diagram of a vehicle power supply device according to an embodiment of the present invention. The flowchart which shows operation | movement of the vehicle side control circuit when the vehicle power supply device in embodiment of this invention becomes a vehicle starting state for the first time from the vehicle non-use state, and the control circuit of an electrical storage apparatus. The flowchart which shows the abnormality detection operation | movement of the accessory power supply system of the vehicle power supply device in embodiment of this invention The flowchart which shows the disconnection detection operation to the load of the power supply device for vehicles in embodiment of this invention. The flowchart which shows operation | movement of the vehicle side control circuit when the vehicle power supply device in embodiment of this invention changes from the vehicle use state to the vehicle non-use state, and the control circuit of an electrical storage apparatus. Block circuit diagram of a conventional vehicle power supply device

Explanation of symbols

11 Main Power Supply 13 Power Storage Device 15 Accessory Load 19 Vehicle Power Switch 23 Starter 31 Power Storage Unit

Claims (7)

A power storage unit that stores power of a main power source and a control circuit that permits power supply from the power storage unit to a load when the voltage (Vb) of the main power source is equal to or lower than a threshold value, and has an idling stop function In a power storage device used for a vehicle power supply device,
The vehicular power supply device includes the main power source, a vehicle power switch that has a lock mode, an accessory mode, an on mode, and a start mode, and switches a power supply destination of the main power source,
The control circuit prohibits power supply from the power storage unit to the load when the vehicle is first activated from a vehicle non-use state in the lock mode, and when the starter is driven after idling stop and A power storage device configured to permit power supply from the power storage unit to the load during the on mode after an initial vehicle activation state . The vehicle power supply device includes a power storage unit that stores power of a main power source, and a control circuit that permits power supply from the power storage unit to a load when the voltage (Vb) of the main power source becomes a threshold value or less. In the power storage device used,
The vehicular power supply device includes the main power source, a vehicle power switch that has a lock mode, an accessory mode, an on mode, and a start mode, and switches a power supply destination of the main power source,
The control circuit prohibits power supply from the power storage unit to the load when the vehicle is in a first vehicle starting state from the vehicle non-use state in the lock mode , and the vehicle power switch is in the start mode when the vehicle power switch is in the start mode. A power storage device configured to cut off power supply to the load supplied from a main power source . The control circuit receives an accessory power supply system voltage (Vac) signal supplied from the main power supply via the accessory mode switch, and the accessory power supply system voltage (Vac) becomes a predetermined value. The power storage device according to claim 1 , wherein it is detected that the vehicle is first activated from the vehicle non-use state. 4. The power storage according to claim 2, wherein the control circuit outputs an abnormal signal if the voltage (Vac) of the accessory power supply system via the accessory mode switch is in an OFF state for a predetermined time or more. apparatus. The control circuit is configured to prohibit power supply from the power storage unit to the load when the vehicle power switch is switched from the on mode to the accessory mode or the lock mode. The power storage device described in 1. The power storage device according to claim 2 or 3, wherein the control circuit outputs a disconnection signal if a supply voltage to the load is in an off state for a predetermined time or more. A vehicle power supply device comprising the power storage device according to claim 1 and the main power supply.

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