JP2012056357A - Power supply control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control device for a vehicle that effectively uses power generated by a solar cell.SOLUTION: This relates to the power supply control device for vehicle that controls charge and discharge of the power supply having an onboard battery 5 for supplying the power to a load group 25 and the solar cell 7 for charging the onboard battery 5 by the generated power. The power supply control device for vehicle includes: a capacitor 12 for storing the power generated by the solar cell 7; a switch circuit 6 for carrying out on or off of connection to the solar cell 7, the capacitor 12 and onboard battery 5; and operation parts 15, 14 for carrying out on or off of the switch circuit 6.

Description

  The present invention relates to a vehicle power supply control device that controls charging / discharging of a power supply device that includes a vehicle-mounted battery that supplies power to a load group and a solar cell that charges the vehicle-mounted battery with generated power.

In a vehicle power source for an engine-driven vehicle, electric power generated by an alternator (generator, AC generator) linked to the engine is supplied to each load mounted on the vehicle and the battery is charged. When the power generated by the alternator is insufficient or when the engine is stopped, power is supplied from the battery to each load.
In a vehicle power source for a hybrid vehicle, as an example, power generated by a generator linked to an engine and regenerative power of a driving motor are charged in a driving high voltage battery. The electric power output from the high voltage battery is stepped down and supplied to each load mounted on the vehicle, and the (low voltage) battery is charged.

In a vehicle power source for an electric vehicle, a high voltage battery for driving is charged with power from an external power source and regenerative power of a driving motor. The electric power output from the high voltage battery is stepped down and supplied to each load mounted on the vehicle, and the (low voltage) battery is charged.
Recently, a power source for a vehicle that charges a battery with electric power generated by a solar cell and supplies it to a load to assist the battery to increase the energy saving effect has been proposed and put into practical use.

Japanese Patent No. 2503446 Japanese Patent Laid-Open No. 7-170674

  In the vehicle power source as described above, when charging the battery with the power generated by the solar battery, for example, if the battery continues to be overcharged even though the battery is in a fully charged state, the battery will deteriorate. In order to effectively use the power generated by the solar cell, it is insufficient to simply connect the solar cell and the battery.

  In relation to such a problem, Patent Document 1 discloses an automotive ventilation charging apparatus that uses electric power generated by a solar cell for vehicle interior ventilation and charges an in-vehicle battery. However, in this vehicle ventilation charging device, if parking ventilation and pre-air conditioning are performed, the remaining capacity of the in-vehicle battery may be reduced, which may reduce the fuel efficiency when the vehicle starts to run. There is. Moreover, the method of utilizing a solar cell is restricted to the air conditioning relationship.

Patent Document 2 discloses a vehicle-mounted charging device that includes a solar cell and a second secondary battery, and selectively charges the power generated by the solar cell to the vehicle-mounted battery and the second secondary battery. Has been. However, in this vehicle-mounted charging device, the second secondary battery may be charged from the vehicle-mounted battery, which may reduce the remaining capacity of the vehicle-mounted battery.
This invention is made | formed in view of the above situations, and it aims at providing the vehicle power supply control apparatus which can utilize effectively the electric power which the solar cell generated.

  A vehicle power supply control device according to a first aspect of the present invention is a vehicle power supply control that controls charging / discharging of a power supply device that includes a vehicle-mounted battery that supplies power to a load group and a solar cell that charges the vehicle-mounted battery with the generated power. In the apparatus, a battery for storing the power generated by the solar cell, a switch circuit for turning on or off the connection between the solar battery and the battery and the in-vehicle battery, and an operation unit for turning on or off the switch circuit; It is characterized by providing.

  In this vehicle power supply control device, the vehicle-mounted battery supplies power to the load group, and the charging / discharging of the power supply device that charges the vehicle-mounted battery is controlled by the power generated by the solar cell. The battery stores the electric power generated by the solar battery, the switch circuit turns on or off the connection between the solar battery and the battery and the in-vehicle battery, and the operation unit turns the switch circuit on or off.

  A power supply control device for a vehicle according to a second aspect of the present invention includes a charging path to the battery, a discharging path from the battery, a switching circuit for switching connection between the charging path and the discharging path of the battery, and the discharging And a booster circuit that is provided in the power path and boosts the output voltage of the battery higher than the output voltage of the in-vehicle battery.

  In this vehicle power supply control device, the switching circuit switches connection between the charging path to the battery, the discharging path from the battery, the charging path and the discharging path of the battery. A booster circuit is provided in the discharge path and boosts the output voltage of the battery higher than the output voltage of the in-vehicle battery.

  The vehicular power supply control device according to a third aspect of the present invention further includes a diode that is connected in series to the switch circuit and prevents backflow from the in-vehicle battery to the solar cell and the battery.

  In this vehicle power supply control device, the diode is connected in series to the switch circuit to prevent backflow from the in-vehicle battery to the solar cell and the battery.

  According to a fourth aspect of the present invention, there is provided a vehicular power supply control device, wherein the power supply device includes a generator that generates power in conjunction with an engine, and the generator for charging the in-vehicle battery with the output voltage of the capacitor. It is configured to be higher than the output voltage.

  In this vehicle power supply control device, the generator of the power supply device generates power in conjunction with the engine, and the output voltage of the battery is made higher than the output voltage of the generator for charging the in-vehicle battery.

  A vehicle power supply control device according to a fifth aspect of the present invention includes one or more second switching circuits that switch connection between predetermined one or more loads in the load group, a solar cell, a capacitor, and an in-vehicle battery, The operation unit is configured to limit the supply destination of power from the solar battery and the battery to the load by switching the second switching circuit to the solar battery and the battery.

  In this vehicle power supply control device, one or a plurality of second switching circuits switches connection between a predetermined one or a plurality of loads in a load group, a solar cell, a capacitor, and an in-vehicle battery. An operation part limits the supply destination of the electric power from a solar cell and a capacitor | condenser to 1 or several load by switching a 2nd switching circuit to a solar cell and a capacitor | condenser.

  According to a sixth aspect of the present invention, there is provided a vehicular power supply control device including a first voltage detector that detects an output voltage value of the battery, and whether or not the voltage value detected by the first voltage detector has reached the first voltage value. First determination means for determining the output voltage value, a second voltage detector for detecting the output voltage value of the in-vehicle battery, and whether or not the voltage value detected by the second voltage detector has reached the second voltage value And a second determination unit configured to turn on the switch circuit when the switching circuit is switched to the charging path, and to switch the switching circuit to the charging path. When it is determined that the first determination means has reached the first voltage value, the switching circuit is switched to the discharge path, and the second determination means has reached the second voltage value. When it is determined that the switch circuit is turned off Forms wherein the are.

  In this vehicle power supply control device, the first voltage detector detects the output voltage value of the battery, and the first determination means determines whether the voltage value detected by the first voltage detector has reached the first voltage value. Determine whether. The second voltage detector detects the output voltage value of the in-vehicle battery, and the second determination means determines whether or not the voltage value detected by the second voltage detector has reached the second voltage value. When the switching circuit is switched to the charging path, the switch circuit is turned on. When the switching circuit is switched to the charging path and the switch circuit is turned on, when the first determination means determines that the first voltage value has been reached, the switching circuit is switched to the discharging path and the second determination means Is determined to have reached the second voltage value, the switch circuit is turned off.

  The vehicular power supply control device according to a seventh aspect is characterized in that the operation unit is configured to turn off the switch circuit when the switching circuit is switched to a charging path.

  In this vehicle power supply control device, the operation unit turns off the switch circuit when the switching circuit is switched to the charging path.

  According to the vehicle power supply control device of the present invention, it is possible to realize a vehicle power supply control device that can effectively use the power generated by the solar cell.

1 is a block diagram showing a schematic configuration of an embodiment of a vehicle power supply control device according to the present invention. It is explanatory drawing which shows the example of operation | movement of the vehicle power supply control apparatus which concerns on this invention. It is explanatory drawing which shows the example of other operation | movement of the vehicle power supply control apparatus which concerns on this invention. It is explanatory drawing which shows the example of other operation | movement of the vehicle power supply control apparatus which concerns on this invention. It is explanatory drawing which shows the example of other operation | movement of the vehicle power supply control apparatus which concerns on this invention.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle power supply control device according to the present invention.
This vehicle power supply control device is applied to a hybrid vehicle, and the generator 2 generates power in conjunction with the engine 1. The electric power generated by the generator 2 is rectified in the generator 2 and charged to the high voltage battery 3 for driving. Here, the drive motor is not shown, but the regenerative power of the drive motor during braking is also charged to the high voltage battery 3.

The power charged in the high-voltage battery 3 is stepped down from 200 V to 13.5 V by the DC / DC converter 4, charged in the main battery (vehicle battery) 5, and supplied to the load group 25 mounted on the vehicle. .
Electric power generated by the solar cell 7 installed on the roof of the vehicle is a noise filter 8 for suppressing radiation noise from the vehicle, a backflow prevention diode 9, and a charging / discharging path (charging) for the sub-battery (capacitor) 12. The sub-battery 12 is charged through the path 23) and the switching circuit 11.

The switching circuit 11 is controlled to be switched by the control unit 14 and switches the connection between the sub battery 12 and the charging / discharging path 23 or the discharging path 24.
The discharge path 24 includes a DC / DC converter 13. The DC / DC converter 13 boosts the power output from the sub-battery 12 from 12.5 V to 14.0 V, and the boosted power passes through the backflow prevention diode 10 and the switch circuit (relay) 6 to the main battery 5. And is supplied to the load group 25.

  In addition, since the sub-battery 12 is required to be deeply discharged by charging from the solar cell 7 and supplying power to the accessory, the so-called cycle use is performed. On the other hand, the main battery 5 is controlled so that the amount of stored electricity is always constant, and high reliability is required, for example, when the vehicle is started. Therefore, the main battery 5 should be separated from the use of the solar battery 7, and for this reason, the sub battery 12 and the switch circuit 6 are provided.

The electric power generated by the solar cell 7 is charged to the main battery 5 and supplied to the load group 25 through the noise filter 8, the backflow prevention diode 9, the backflow prevention diode 10 and the switch circuit 6. .
The electric power output from the main battery 5 is supplied to the ventilation group ECU (Electronic Control Unit) 19 through the switching circuit 17 in addition to being supplied to the load group 25. The ventilation ECU 19 drives and controls the blower motor 20 which is a ventilation air conditioning system load.
The power output from the main battery 5 is also supplied to the audio system load and output terminal (cigarette lighter) of the accessory system through the accessory switch (relay) 16 and the switching circuit 18.

The switching circuits (second switching circuits) 17 and 18 switch the connection between the power line from the main battery 5 or the power line from the solar battery 7 and the sub battery 12 and each load.
The control unit 14 detects the output voltage of the sub-battery 12 by a voltage detector (first voltage detector) 22 and detects the output voltage of the main battery 5 by a voltage detector (second voltage detector) 21, respectively. To do. The control unit 14 also detects the output voltage value of the solar cell 7 in which noise is suppressed by the noise filter 8 with the built-in voltage detector 26, and the solar cell 7 generates power based on the detected output voltage value. It is determined whether or not.

The control unit 14 is operated by the supply destination switch 15 provided on the front panel of the vehicle, the voltage value detected by the voltage detectors 21, 22, and 26, and traveling from the drive system (engine 1, drive motor). Based on the state signal indicating that the vehicle is in the middle / parking state, the switching circuits 11, 17, and 18 are switched and the switch circuit 6 is turned on / off.
The supply destination changeover switch 15 can be switched between [normal] and [accessory], and includes a “ventilation / air purification switch” as a subordinate switch of [normal]. The “ventilation / air cleaning switch” is turned on, for example, when an indoor temperature sensor (not shown) detects 30 degrees or more.

Hereinafter, an example of the operation of the vehicular power supply control device having such a configuration will be described with reference to an explanatory diagram showing the operation.
(Supplied to the main battery system when the vehicle is running)
When the vehicle is traveling, when the supply destination switch 15 is switched to [normal] and the solar cell 7 is generating power, the switch circuit 6 is turned on and the switching circuit 11 is the charge / discharge path 23 as shown in FIG. On the side, the accessory switch 16 is on, and the switching circuits 17 and 18 are on the power line side from the main battery 5.
Thereby, the electric power generated by the solar cell 7 is charged to the main battery 5 through the diode 10 and the switch circuit 6, and is supplied to the load group 25, the blower motor 20 and the accessory system, and is supplied to the sub battery 12 through the switching circuit 11. Charged.

The control unit 14 determines whether or not the output voltage of the sub-battery 12 detected by the voltage detector 22 has reached the first voltage value. When it is determined that the output voltage has reached the first voltage value, the control circuit 14 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the sub-battery 12 is stopped.
The control unit 14 determines whether or not the output voltage of the main battery 5 detected by the voltage detector 21 has reached the second voltage value. When it is determined that the output voltage has reached the second voltage value, the switch circuit 6 is turned off, the switching circuit 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the main battery 5 is stopped.

  When the switching circuit 11 is switched to the discharge path 24 side, the DC / DC converter 13 boosts the output power of the sub-battery 12 from 12.5V to 14.0V. If the switch circuit 6 is on, the boosted power is charged to the main battery 5 through the diode 10 and the switch circuit 6, and is supplied to the load group 25, the blower motor 20, and the accessory system, and the switch circuit 6 is turned off. If so, it will not flow to either.

When the vehicle is traveling, when the supply destination switch 15 is switched to [Normal] and the solar cell 7 is not generating power, the switch circuit 6 is turned on, the switch circuit 11 is on the discharge path 24 side, and the accessory switch 16 is turned on. In addition, the switching circuits 17 and 18 are on the power line side from the main battery 5.
The DC / DC converter 13 boosts the output power of the sub-battery 12 from 12.5V to 14.0V. The boosted power is charged to the main battery 5 through the diode 10 and the switch circuit 6, and is supplied to the load group 25, the blower motor 20, and the accessory system.

(Supplied to accessory system when parking)
When parking, when the supply destination switch 15 is switched to [Accessories] and the solar cell 7 is generating power, as shown in FIG. 3, the switch circuit 6 is off and the switch circuit 11 is on the charge / discharge path 23 side. In addition, the accessory switch 16 is turned off. The switching circuit 17 is on the power line side from the main battery 5, and the switching circuit 18 is on the power line side from the solar battery 7 and the sub battery 12.

Since the switching circuit 18 is on the solar cell 7 and sub battery 12 side, power is supplied from the solar cell 7 and the sub battery 12 to the load of the accessory system regardless of whether the accessory switch 16 is on or off.
The electric power generated by the solar cell 7 is charged to the sub battery 12 through the switching circuit 11 and supplied to the accessory system through the switching circuit 18.

  The control unit 14 determines whether or not the output voltage of the sub-battery 12 detected by the voltage detector 22 has reached the first voltage value. When it is determined that the output voltage has reached the first voltage value, the control circuit 14 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the sub-battery 12 is stopped.

(When parking, supply to ventilation / air purification system)
When parking, when the supply destination switch 15 is switched to [normal], the ventilation / air purification switch is on, and the solar cell 7 is generating power, the switch circuit 6 is switched off as shown in FIG. The circuit 11 is on the charge / discharge path 23 side, and the accessory switch 16 is off. The switching circuit 17 is on the power line side from the solar cell 7 and the sub battery 12, and the switching circuit 18 is on the power line side from the main battery 5.

Since the switching circuit 17 is on the solar battery 7 and sub battery 12 side, the blower motor 20 is supplied with power from the solar battery 7 and the sub battery 12 if the power switch is on. As a result, the vehicle compartment can be ventilated and air-cleaned without imposing a burden on the main battery 5 even during parking.
The electric power generated by the solar cell 7 is also charged into the sub-battery 12 through the switching circuit 11 and supplied to the blower motor 20 through the switching circuit 17.

  The control unit 14 determines whether or not the output voltage of the sub-battery 12 detected by the voltage detector 22 has reached the first voltage value. When it is determined that the output voltage has reached the first voltage value, the control circuit 14 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the sub-battery 12 is stopped.

When parking, when the supply destination switch 15 is switched to [normal] and the solar cell 7 is not generating power, the switch circuit 6 is turned off, the switch circuit 11 is on the charge / discharge path 23 side, and the accessory switch 16 is turned on. Or it is off. The switching circuit 17 is on the power line side from the solar cell 7 and the sub battery 12, and the switching circuit 18 is on the power line side from the main battery 5.
The electric power from the sub battery 12 is supplied to the blower motor 20 through the switching circuit 17.

(Supplied to main battery and sub battery when parking)
When parking, when the supply destination switch 15 is switched to [normal], the ventilation / air purification switch is off, and the solar cell 7 is generating power, the switch circuit 6 is switched on as shown in FIG. The circuit 11 is on the charge / discharge path 23 side, and the accessory switch 16 is off. The switching circuits 17 and 18 are on the power line side from the main battery 5.
Thereby, the electric power generated by the solar cell 7 is charged to the main battery 5 through the diode 10 and the switch circuit 6 and is supplied to the load group 25 (dark current), the blower motor 20 and the accessory system, and through the switching circuit 11. The sub battery 12 is charged.

The control unit 14 determines whether or not the output voltage of the sub-battery 12 detected by the voltage detector 22 has reached the first voltage value. When it is determined that the output voltage has reached the first voltage value, the control circuit 14 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the sub-battery 12 is stopped.
The control unit 14 determines whether or not the output voltage of the main battery 5 detected by the voltage detector 21 has reached the second voltage value. When it is determined that the output voltage has reached the second voltage value, the switch circuit 6 is turned off, the switching circuit 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the main battery 5 is stopped.

  During parking, when the supply destination switch 15 is switched to [normal] and the solar battery 7 is not generating power, the switch circuit 6 is turned on, the switch circuit 11 is on the discharge path 24 side, and the accessory switch 16 is turned off. It has become. The switching circuits 17 and 18 are on the power line side from the main battery 5.

(Supplied to the sub battery when the vehicle is running)
When the vehicle travels, when the supply destination changeover switch 15 is switched to [Accessories] and the solar cell 7 is generating power, in FIG. 5, the switch circuit 6 is turned off, and the switching circuit 11 is on the charging / discharging path 23 side. The accessory switch 16 is turned on. The switching circuits 17 and 18 are on the power line side from the main battery 5.
Thereby, the electric power generated by the solar cell 7 is not charged in the main battery 5 but is charged in the sub-battery 12 through the switching circuit 11.

  The control unit 14 determines whether or not the output voltage of the sub-battery 12 detected by the voltage detector 22 has reached the first voltage value. When it is determined that the output voltage has reached the first voltage value, the control circuit 14 11 is switched to the discharge path 24 side, and charging from the solar cell 7 to the sub-battery 12 is stopped.

When parking, the supply destination changeover switch 15 is switched to [Accessories], and when the solar cell 7 is not generating power, the switch circuit 6 is turned off, the switching circuit 11 is on the discharge path 24 side, and the accessory switch 16 is turned on or off. Is turned off. The switching circuits 17 and 18 are on the power line side from the main battery 5.
In the present embodiment, the vehicle power supply control device applied to the hybrid vehicle has been described, but it goes without saying that the vehicle power supply control device according to the present invention can also be applied to an engine-driven vehicle and an electric vehicle.

DESCRIPTION OF SYMBOLS 1 Engine 2 Generator 3 High voltage battery 4,13 DC / DC converter 5 Main battery (vehicle-mounted battery)
6 Switch Circuit 7 Solar Cell 9.10 Diode 11 Switching Circuit 12 Sub Battery (Accumulator)
14 Control unit (first determination means, second determination means)
15 Supply switch 16 Accessory switch 17, 18 Switching circuit (second switching circuit)
20 Blower motor 21 Voltage detector (second voltage detector)
22 Voltage detector (first voltage detector)
23 Charging / Discharging Path (Charging Path)
24 Discharge path 25 Load group 26 Voltage detector

Claims (7)

In a vehicle power supply control device that controls charging / discharging of a power supply device that includes a vehicle-mounted battery that supplies power to a load group, and a solar cell that charges the vehicle-mounted battery with generated power,
A power storage device for storing the power generated by the solar cell; a switch circuit for turning on or off the connection between the solar cell and the power storage device and the in-vehicle battery; and an operation unit for turning the switch circuit on or off. A power control device for a vehicle characterized by the above.   A charging path to the capacitor, a discharging path from the capacitor, a switching circuit for switching connection between the charging path and the discharging path of the capacitor, and an output voltage of the capacitor are provided in the discharging path. The vehicular power supply control device according to claim 1, further comprising a boosting circuit that boosts the output voltage higher than the output voltage of the in-vehicle battery.   3. The vehicle power supply control device according to claim 1, further comprising a diode connected in series to the switch circuit to prevent backflow from the in-vehicle battery to the solar cell and the battery.   The power supply apparatus includes a generator that generates power in conjunction with an engine, and is configured to make an output voltage of the battery higher than an output voltage of the generator for charging the in-vehicle battery. Item 4. The vehicle power supply control device according to any one of Items 1 to 3.   One or a plurality of second switching circuits for switching connection between a predetermined load or a plurality of loads in the load group, a solar cell, a capacitor, and a vehicle-mounted battery are provided, and the operation unit includes the second switching circuit as a solar cell. 5. The vehicle power supply control device according to claim 1, wherein the vehicle power supply control device is configured to limit a supply destination of power from the solar cell and the storage device to the load by switching to the storage device.   A first voltage detector for detecting an output voltage value of the battery; a first determination means for determining whether or not a voltage value detected by the first voltage detector has reached a first voltage value; A second voltage detector for detecting the output voltage value of the output voltage, and a second determination means for determining whether or not the voltage value detected by the second voltage detector has reached the second voltage value. Is switched to the charging path, the first determination is made when the switching circuit is switched to the charging path and the switch circuit is turned on. When the means determines that the first voltage value has been reached, the switching circuit is switched to the discharge path, and when the second determination means determines that the second voltage value has been reached, the switch circuit is turned off. Any one of Claims 1 thru | or 5 comprised so that it may do The vehicle power control system according to.   The vehicle power supply control device according to any one of claims 1 to 6, wherein the operation unit is configured to turn off the switch circuit when the switching circuit is switched to a charging path. .

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