JP2012205469A - Power supply device, power control device, and power supply program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device supplying a power to equipment mounted on a vehicle capable of performing charging from one battery to the other battery even in a configuration having a breaker for breaking an output from the one battery.SOLUTION: A power supply system 1 has: a high-voltage power source 12 supplying a power to a motor generator 27 and the like mounted on a vehicle; a low-voltage power source 13 supplying a power to a light and the like mounted on the vehicle; a DC-DC converter 15 for supplying a power used for charging the low-voltage power source 13 from the high-voltage power source 12 to the low-voltage power source 13; and a system main relay 14 that can break an output from the high-voltage power source 12. An electronic control unit 11 acquires information of a charging capacitance in the low-voltage power source 13, and when the acquired charging capacitance in the low-voltage power source 13 is a capacitance required to be charged, forbids the system main relay 14 to break the output from the high-voltage power source 12.

Description

  The present invention relates to a power supply device, a power control device, and a power supply program for supplying power to equipment mounted on a vehicle.

  As the above-described power supply device, for example, a plurality of batteries including a battery for supplying power for driving a motor used for traveling of the vehicle and a battery for supplying power to electrical components of the vehicle The one with is known. In particular, in a configuration including a plurality of batteries, one that can charge the other battery from one battery is known (see, for example, Patent Document 1).

JP 2007-288918 A

  By the way, in what can charge with respect to the other battery from one battery as mentioned above, the interruption | blocking part for interrupting | blocking the output from one battery may be provided. This breaker is usually provided to prevent leakage of electric power in the event of an emergency such as a vehicle collision with respect to a battery capable of releasing large electric power. Then, the power supply from the battery is stopped.

  However, in the configuration including such a blocking unit, when charging from one battery to the other battery is performed, if the blocking unit stops supplying power from the battery, There was a problem that the battery could not be charged.

  Accordingly, in view of such problems, in a power supply device, a power control device, and a power supply program for supplying power to a device mounted on a vehicle, a blocking unit for blocking output from one battery It is an object of the present invention to enable charging from one battery to the other battery even in a configuration including the above.

  In the power supply device having the first configuration configured to achieve the above object, a first battery for supplying power to the first device mounted on the vehicle, and a second battery mounted on the vehicle. A second battery for supplying power to the device, a supply unit for supplying power for charging the second battery from the first battery to the second battery, and And a blocking portion capable of blocking output. Then, the prohibiting unit obtains information on the charge capacity of the second battery, and when the charge capacity of the second battery is less than the required charge capacity, which is a capacity that requires charging, the blocking unit detects from the first battery. It is prohibited to cut off the output of

  According to such a power supply device, even when the first battery is provided with a safety shut-off unit, the operation of the shut-off unit can be limited when necessary. Power can be supplied to the two batteries. In addition, the interruption | blocking part is arrange | positioned between the supply part and between the 1st battery and the 1st apparatus, and when the 1st apparatus is not used, the electric power with respect to the 1st apparatus is provided. It is good to have the structure which has the function which interrupts | blocks supply.

  Moreover, in the said electric power supply apparatus, the information of the charge capacity in a 1st battery is acquired like the 2nd structure, and the charge capacity in a 1st battery has no room to supply electric power to a 2nd battery. Limiting means for limiting the operation of the prohibiting means may be provided when the capacity is a supply impossible capacity.

  According to such a power supply device, when the charge capacity of the first battery is in a state where there is no margin, power is not supplied from the first battery to the second battery. By supplying electric power to the first battery, it is possible to prevent the first battery from running out of capacity.

  Further, the power supply apparatus may include a suppression unit that suppresses power consumption in the second device when the limiting unit limits the operation of the prohibiting unit, as in the third configuration.

  According to such a power supply device, when power cannot be supplied from the first battery to the second battery, power consumption in the second device is suppressed, so that it is difficult to reduce the charge capacity of the second battery. can do.

  Next, in the power control device as a fourth configuration made to achieve the above object, the first battery, the second battery, the supply unit, the cutoff unit, and the first battery to the second battery are used. Power control means for controlling the power supplied to the battery, and the power control means is configured as each means constituting the power supply device described in any one of the above.

  Moreover, the power supply program as the fifth configuration is a program for causing a computer to function as each means constituting the power supply device or the power control device described above.

  According to such a power control apparatus and power supply program, at least the same effects as those of the power supply apparatus according to claim 1 can be enjoyed.

1 is a block diagram showing a schematic configuration of a power supply system 1. FIG. It is a flowchart which shows an electric power supply process.

Embodiments according to the present invention will be described below with reference to the drawings.
[Configuration of this embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a power supply system 1 (power supply apparatus) to which the present invention is applied. The power supply system 1 is mounted on a vehicle such as a passenger car, for example, and is configured as a system that supplies power to devices mounted on the vehicle.

  As shown in FIG. 1, the power supply system 1 includes an electronic control unit 11, a high voltage power source 12 (first battery), a low voltage power source 13 (second battery), and a system main relay 14 (blocking unit). , DCDC converter 15 (supply unit), boost converter 16, main machine load (first device) operated by high-voltage power supply 12, and auxiliary machine loads 21-23 (second device) operated by low-voltage power supply 13. ) And.

  The high-voltage power supply 12 and the low-voltage power supply 13 are provided with current sensors 31 and 34, voltage sensors 32 and 35, and temperature sensors 33 and 36, respectively. ) And the power supplied from each of the power supplies 12 and 13 can be monitored. Further, a current sensor 37 is also disposed on the power line for the auxiliary machine loads 21 to 23 so that the power consumed in the auxiliary machine loads 21 to 23 can be monitored.

  The electronic control unit 11 is configured as a known microcomputer including a CPU, a ROM, a RAM, and the like. The electronic control unit 11 executes a program (including a power supply program) stored in the ROM and the like, and is detected by each of the sensors 31 to 37. Processing such as operating the system main relay 14 according to the value to be executed is performed. The electronic control unit 11 is connected to the in-vehicle LAN 5 and has a function of communicating with other devices such as auxiliary loads 21 to 23 connected to the in-vehicle LAN 5.

  The high-voltage power supply 12 is a battery whose voltage is set relatively high with respect to the low-voltage power supply 13, and main machines such as motor generators 27 and 28 and an electric air conditioner 26 mounted on the vehicle via the system main relay 14 and the like. Supply power to the load. Further, the high voltage power supply 12 is set so as to be able to supply power to the low voltage power supply 13 and the auxiliary machine loads 21 to 23 as needed via the DCDC converter 15. The voltage of the high voltage power supply 12 is set to about 300V to 650V.

The low-voltage power supply 13 supplies power to the auxiliary machine loads 21 to 23 mounted on the vehicle. The voltage of the low voltage power supply 13 is set to about 12V to 14V.
The system main relay 14 is disposed between the DCDC converter 15 and the main engine load, and has a function of cutting off power supply to the main engine load when the main engine load is not used. ing. That is, the system main relay 14 prevents the leakage from the high-voltage power supply 12 in the event of a vehicle accident or the like by enabling the output from the high-voltage power supply 12 to which a large amount of power is supplied.

  Therefore, the system main relay 14 is in a disconnected state in which the output from the high-voltage power supply 12 is cut off in a normal state, and is in a connected state in which the output from the high-voltage power supply 12 is supplied only when the main engine load is operated in principle. . In such a connected state, power is also supplied to the DCDC converter 15. However, in the present embodiment, the system main relay 14 is set in the connected state even when a predetermined condition is satisfied in the power supply process described later.

  The DCDC converter 15 supplies power supplied from the high-voltage power supply 12 to a voltage (for example, 14 V) for charging the low-voltage power supply 13 in order to supply power from the high-voltage power supply 12 to the low-voltage power supply 13. And output to the low-voltage power supply 13 side.

  Boost converter 16 transforms the voltage to the optimum voltage when supplying power to motor generators 27 and 28 from high-voltage power supply 12 or charging power generated by motor generators 27 and 28 to high-voltage power supply 12. It has a function. Inverters 41 and 42 are arranged between boost converter 16 and motor generators 27 and 28. These inverters 41 and 42 are well-known control circuits used for driving and controlling the motor generators 27 and 28.

  Here, the motor generators 27 and 28 are connected to the engine 51 of the vehicle via the planetary gear mechanism 52. One motor generator 27 (MG1) functions as a starter of the engine and also functions as a generator using regenerative energy. The other motor generator 28 (MG2) functions as power for the vehicle.

  The other motor generator 28 (MG2) can also be used as a generator. Further, the power from the engine 51 and the power from the motor generator 28 (MG 2) are transmitted to the drive wheels 54 through the differential gear 53.

  The auxiliary loads 21 to 23 include navigation devices, meters, lights, and the like that are operated by the low-voltage power supply 13. Note that various types of equipment other than those listed above may be applicable to the main machine load and the auxiliary machine load.

[Process of this embodiment]
In the power supply system 1 configured as described above, when the charging capacity of the low-voltage power supply 13 is insufficient, the process of setting the system main relay 14 to the connected state is performed. This process will be described with reference to FIG. FIG. 2 is a flowchart showing power supply processing executed by the electronic control unit 11.

  The power supply process is a process that is started when a vehicle such as an ignition switch (not shown) is turned on, and is repeatedly executed thereafter. In the power supply process, as shown in FIG. 2, first, it is determined whether or not the key matching in the vehicle is completed (S110).

  In this process, in the case of a method in which the shape of the key is collated by the keyhole, it is determined whether or not the key is turned at least one stage from the state in which the key is inserted into the keyhole. Further, in the case of a method of recognizing an ID unique to an electronic key by wireless communication with the electronic key, it is determined whether or not authentication by this wireless communication is completed.

  If the key verification is not completed (S110: NO), the power supply process is terminated. When the key verification is not completed, it is considered that the auxiliary loads 21 to 23 are also in an unusable state, and power is not consumed, so that the charging capacity of the low-voltage power supply 13 is not insufficient. This is because it is assumed.

  If the key collation is completed (S110: YES), the state of the system main relay 14 is determined (S120). If the system main relay 14 is in a connected state (S120: YES), the power supply process is terminated.

  Further, if the system main relay 14 is in the cut-off state (S120: NO), the stored power amount (charge capacity) of the low-voltage power supply 13 and the power consumption by the auxiliary loads 21 to 23 are multiplied by a certain time (for example, 20 minutes). The power consumption (required charge capacity) is compared (S130: prohibition means). Here, the amount of stored power in each of the power supplies 12 and 13 can be obtained by using a known method based on the detection results of the current sensors 31 and 34, the voltage sensors 32 and 35, and the temperature sensors 33 and 36. Further, the power consumption can be obtained by using the detection results of the current sensor 37 arranged on the power line for the auxiliary loads 21 to 23 and the voltage sensor 35 provided in the low voltage power supply 13.

  If the stored power amount of the low-voltage power supply 13 is equal to or greater than the power consumption amount (S130: NO), the low-voltage power supply 13 is not required to be charged and the power supply process is terminated. If the stored power amount of the low-voltage power source 13 is less than the consumed power amount (capacity that cannot be supplied) (S130: NO), the stored power amount of the high-voltage power source 12 and a value that allows the high-voltage power source 12 to operate the main engine load for a certain time or more (S140: Limiting means).

  If the stored power amount of the high-voltage power supply 12 is less than the required power amount (S140: NO), the power consumption by the auxiliary loads 21 to 23 is suppressed (S150: suppression means), and the power supply process is terminated. In the process of S150, for example, the power switches of the auxiliary machine loads 21 to 23 are disconnected.

  If the stored power amount of the high-voltage power supply 12 is equal to or greater than the required power amount (S140: YES), the system main relay 14 is set in the connected state (S160: prohibition means), and the power supply process is terminated.

[Effects of this embodiment]
In the power supply system 1 described in detail above, the high-voltage power supply 12 that supplies power to the main engine loads (motor generators 27 and 28, electric air conditioner 26) mounted on the vehicle, and the auxiliary device mounted on the vehicle. A low-voltage power supply 13 for supplying power to the mechanical loads 21 to 23, a DCDC converter 15 for supplying power for charging the low-voltage power supply 13 from the high-voltage power supply 12 to the low-voltage power supply 13, and an output from the high-voltage power supply 12 And a system main relay 14 capable of interrupting. The system main relay 14 is disposed between the DCDC converter 15 and the main engine load, and has a function of cutting off power supply to the main engine load when the main engine load is not used. ing.

  Then, the electronic control unit 11 acquires information on the charging capacity in the low-voltage power supply 13, and when the charging capacity in the low-voltage power supply 13 is less than the required charging capacity that is a capacity that requires charging, the system main relay 14 is connected to the high-voltage power supply 12. It is forbidden to cut off the output from.

  According to such a power supply system 1, even when the high-voltage power supply 12 is provided with the system main relay 14 for safety, the operation of the system main relay 14 can be limited when necessary. Therefore, power can be supplied to the low-voltage power supply 13.

  Further, in the power supply system 1, the electronic control unit 11 acquires information on the charge capacity in the high voltage power supply 12, and the charge capacity in the high voltage power supply 12 is a supply impossible capacity that is a capacity that cannot afford to supply power to the low voltage power supply 13. In some cases, the system main relay 14 cuts off the output from the high voltage power supply 12 so that power is not supplied from the high voltage power supply 12 to the low voltage power supply 13.

  According to such a power supply system 1, power is not supplied from the high-voltage power supply 12 to the low-voltage power supply 13 when the charge capacity of the high-voltage power supply 12 is not sufficient. By supplying, it is possible to prevent the capacity of the high-voltage power supply 12 from becoming insufficient.

  Further, in the power supply system 1, the electronic control unit 11 is configured to prevent the auxiliary load 21 from being supplied from the high-voltage power supply 12 to the low-voltage power supply 13 when the charging capacity of the high-voltage power supply 12 is not sufficient. The power consumption in ˜23 is suppressed.

  According to such a power supply system 1, when power cannot be supplied from the high-voltage power supply 12 to the low-voltage power supply 13, power consumption in the auxiliary loads 21 to 23 is suppressed, so that it is difficult to reduce the charging capacity of the low-voltage power supply 13. can do.

[Other Embodiments]
Embodiments of the present invention are not limited to the above-described embodiments, and can take various forms as long as they belong to the technical scope of the present invention.

  For example, in the above embodiment, in the process of S130, the stored power amount in the low-voltage power source 13 and the power consumption amount (variation values according to the power consumption by the auxiliary loads 21 to 23) are compared. You may compare electric energy and reference | standard electric energy (the fixed value which is not influenced by the power consumption by auxiliary machine load 21-23).

  In the above embodiment, the stored power amount is obtained from the battery current, the battery voltage, and the battery temperature. However, the stored power amount may be obtained from the battery voltage and the battery temperature without using the battery current. In this case, for example, a correlation map between the battery internal resistance and the battery temperature is prepared in advance based on experiments or the like, and the battery internal resistance is estimated from the battery temperature using this map.

  Then, the battery current is estimated from the estimated battery internal resistance and the battery voltage. In this way, the amount of stored power can be determined without directly monitoring the battery current.

  Furthermore, in the said embodiment, in order to suppress the power consumption by auxiliary machine load 21-23, it comprised so that the electronic control unit 11 cut | disconnected the power supply (switch) of auxiliary machine load 21-23, but vehicle-mounted LAN is used. The auxiliary loads 21 to 23 transmit a signal indicating that the load is limited, and the auxiliary loads 21 to 23 that have received the signal save power such as suppressing the brightness of the light. You may comprise so that it may become a mode.

  Moreover, in the said embodiment, although the process at the time of connecting the system main relay 14 was demonstrated, when the power supply process is complete | finished without implementing the process of S160 after the connection of the system main relay 14, You may make it make the system main relay 14 into the interruption | blocking state.

  DESCRIPTION OF SYMBOLS 1 ... Electric power supply system, 11 ... Electronic control unit, 12 ... High voltage power supply, 13 ... Low voltage power supply, 14 ... System main relay, 15 ... DCDC converter, 16 ... Boost converter, 21 ... Auxiliary load, 26 ... Electric air conditioner, 27 , 28 ... Motor generator, 31 ... Current sensor, 32 ... Voltage sensor, 33 ... Temperature sensor, 34 ... Current sensor, 35 ... Voltage sensor, 36 ... Temperature sensor, 37 ... Current sensor, 41 ... Inverter, 51 ... Engine, 52 ... planetary gear mechanism, 53 ... differential gear, 54 ... drive wheel.

Claims (5)

A power supply device that supplies power to equipment mounted on a vehicle,
A first battery for supplying power to a first device mounted on the vehicle;
A second battery for supplying power to a second device mounted on the vehicle;
A supply unit for supplying electric power for charging the second battery from the first battery to the second battery;
A blocking unit capable of blocking output from the first battery;
The information on the charge capacity in the second battery is obtained, and when the charge capacity in the second battery is less than the required charge capacity, which is a capacity that requires charging, the blocking unit outputs from the first battery. A prohibition means for prohibiting blocking,
A power supply device comprising: The power supply device according to claim 1,
The prohibition unit obtains information on a charge capacity in the first battery, and the charge capacity in the first battery is an unsuppliable capacity that is a capacity that cannot afford to supply power to the second battery. A power supply device comprising: a restricting means for restricting the operation of the power supply. The power supply device according to claim 2,
A power supply apparatus comprising: a suppression unit configured to suppress power consumption in the second device when the limiting unit limits the operation of the prohibiting unit. A first battery for supplying power to a first device mounted on the vehicle;
A second battery for supplying power to a second device mounted on the vehicle;
A supply unit for supplying electric power for charging the second battery from the first battery to the second battery;
A blocking unit capable of blocking output from the first battery;
Power control means for controlling power supplied from the first battery to the second battery;
With
The power control device is configured as each unit constituting the power supply device according to any one of claims 1 to 3. The power control device according to any one of claims 1 to 3.   A power supply program for causing a computer to function as each means constituting the power supply device according to any one of claims 1 to 3 or the power control device according to claim 4.

Images