JP4501604B2 - Electrical system control equipment - Google Patents

Description

  The present invention relates to a control device for an electrical system, and more particularly to control of an electrical system provided with a power storage device, a voltage regulator connected to the power storage device, and an electric device to which power is supplied via the voltage regulator. Relates to the device.

  In recent years, attention has been paid to vehicles such as hybrid vehicles, fuel cell vehicles, and electric vehicles that can be driven by driving force from a driving motor as part of countermeasures for environmental problems. Such a vehicle is equipped with a power storage device such as a battery or a capacitor for storing electric power to be supplied to the traveling motor. The electric power stored in the power storage device is supplied to electric devices such as auxiliary machines mounted on the vehicle in addition to the traveling motor. Since the voltage of the power storage device is high (for example, about 300 V), the auxiliary machinery is supplied with power whose voltage has been reduced by the DC / DC converter. By the way, since the electric power stored in the power storage device is limited, it is necessary to supply the electric power according to the state of the power storage device.

  Japanese Patent Laying-Open No. 2000-253507 (Patent Document 1) discloses a hybrid vehicle that manages charge / discharge power of a high-power battery that supplies power to a traveling motor. The hybrid vehicle described in Patent Document 1 supplies power to an engine, a first rotating electrical machine, a second rotating electrical machine that starts the engine, and each rotating electrical machine, each of which can transmit a driving force to a drive system of the vehicle. A high-power battery, a DC / DC converter that adjusts the output of the high-power battery to a voltage suitable for the electric system of the vehicle, and an amount of power supplied from the high-power battery to each rotating electrical machine and the DC / DC converter according to the driving state of the vehicle And a control circuit for controlling. When the controllable output power is smaller than the sum of the power consumption of the DC / DC converter, the starting power consumption of the second rotating electrical machine, and the powering power consumption of the first rotating electrical machine, the power consumption is in the order of power consumption. Priority is given to supplying high-power battery power.

According to the hybrid vehicle described in this publication, the output power of the high-power battery includes at least the power consumption of the DC / DC converter, the power consumption during start-up of the second rotating electrical machine, and the power consumption during power running of the first rotating electrical machine. Is less than the sum of the power, the power supplied to the first rotating electrical machine is suppressed, and the power of the high-power battery is preferentially distributed to the DC / DC converter or the second rotating electrical machine. Therefore, it is possible to avoid a situation in which the power supply to the auxiliary machines becomes impossible or the engine start is delayed due to traveling by the driving force of the first rotating electrical machine in a state where the output possible voltage of the high power battery is lowered. be able to. That is, it is possible to reliably maintain the function of the hybrid vehicle while preventing overdischarge of the high power battery.
JP 2000-253507 A

  However, in the hybrid vehicle described in Japanese Patent Laid-Open No. 2000-253507, electric power is supplied to the auxiliary equipment in a state where the output voltage of the high-power battery is reduced. In this state, in order to secure electric power necessary for the operation of the auxiliary machinery, it is necessary to increase the input current value to the DC / DC converter. Therefore, the rated current value on the input side of the DC / DC converter must be increased. As a result, the DC / DC converter must be designed to withstand a high current value, resulting in an increase in cost and weight.

  The present invention has been made to solve the above-described problems, and its purpose is to secure the output from the power adjustment device (DC / DC converter) while reducing the input current value to the power adjustment device. It is providing the control apparatus of the electric system which can reduce cost and weight by suppressing.

  An electric system control device according to a first aspect of the present invention is an electric system control device including a power supply device, a voltage adjustment device connected to the power supply device, and an electric device to which electric power is supplied via the voltage adjustment device. is there. The control device includes means for detecting at least one of an output voltage value and an output current value from the voltage regulator to the electric device, and at least an input voltage value and an input current value from the power supply device to the voltage regulator. Controlling the electrical system based on means for detecting either, at least one of the detected output voltage value and output current value, and at least one of the detected input voltage value and input current value And control means.

  According to the first invention, the electrical system is controlled based on at least one of the output voltage value and the output current value and at least one of the detected input voltage value and output current value. For example, when the output voltage value is lower than the predetermined output voltage value and the output current value is lower than the predetermined output current value, the output side of the voltage regulator only increases the output power value. It can be said that there is a margin. On the other hand, when the input current value is higher than the predetermined input current value (when the input voltage value is lower than the predetermined input voltage value), the input current value becomes the rated current value on the input side of the voltage regulator. It's close. In this case, it can be said that there is no room for further increasing the input current value by increasing the input current value. Under such a state, the electric system is controlled so that the input current value becomes low. At this time, the electric system is controlled so that the voltage value of the power storage device included in the power supply device is increased and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained. As a result, it is possible to provide a control device for an electric system that can reduce the cost and weight by suppressing the input current value to the power adjustment device while securing the output from the power adjustment device.

  In the control device for the electric system according to the second invention, in addition to the configuration of the first invention, the control means controls the electric system so that the input current value becomes low when a predetermined condition is satisfied. Means for controlling.

  According to the second invention, for example, the output voltage value is lower than the predetermined output voltage value, the output current value is lower than the predetermined output current value, and the input current value is predetermined. If the condition that the input current value is higher (the input voltage value is lower than the predetermined input voltage value) is satisfied, the electric system is controlled so that the input current value becomes lower. At this time, the electric system is controlled so that the voltage value of the power storage device included in the power supply device is increased and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  In the control apparatus for an electrical system according to the third invention, in addition to the configuration of the second invention, the predetermined condition is that the output voltage value is lower than the predetermined output voltage value and the output current value is At least one of the conditions that the output current value is lower than a predetermined output current value and the condition that the input current value is higher than a predetermined input current value.

  According to the third invention, at least one of the condition that the output voltage value is lower than the predetermined output voltage value and the condition that the output current value is lower than the predetermined output current value and the input current value Is higher than a predetermined input current value (when the input voltage value is lower than the predetermined input voltage value), the electrical system is controlled so that the input current value becomes lower . At this time, the electric system is controlled so that the voltage value of the power storage device included in the power supply device is increased and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  In the control device for an electric system according to the fourth invention, in addition to the configuration of the second or third invention, the power supply device is a power storage device. The control means includes means for controlling the electrical system such that the voltage value of the power storage device is increased and the input current value is decreased.

  According to the fourth invention, the electric system is controlled such that the voltage value of the power storage device is increased and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  In the control device for an electrical system according to the fifth invention, in addition to the configuration of the fourth invention, the power supply device further includes an inverter connected to the power storage device. The control means includes means for controlling the electric system such that the voltage value of the power storage device is increased by decreasing or stopping the power supply from the power storage device to the inverter, and the input current value is decreased.

  According to the fifth invention, by reducing or stopping the power supply from the power storage device to the inverter, the current flowing in the power storage device is reduced, and the voltage drop due to the internal resistance of the power storage device is reduced. The voltage value of the power storage device is increased by an amount corresponding to the decrease in voltage drop, and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  In the electrical system control device according to the sixth invention, in addition to the configuration of the fourth invention, the power supply device further includes an inverter connected to the power storage device. The control means includes means for controlling the electrical system such that the voltage value of the power storage device is increased by increasing the power supplied from the inverter to the power storage device, and the input current value is decreased.

  According to the sixth invention, by increasing the power supplied from the inverter to the power storage device, the power storage device is charged, the voltage value is increased by the internal resistance of the power storage device, and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  In the control device for an electrical system according to the seventh aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the power supply device further includes an inverter connected to the voltage regulator. The control means includes means for controlling the electrical system such that the voltage value of the power storage device is increased by increasing the power supplied from the inverter to the voltage regulator, and the input current value is decreased.

  According to the seventh invention, by increasing the power supplied from the inverter to the voltage regulator, the power supplied from the power storage device to the voltage regulator decreases, and the current flowing in the power storage device decreases, and the power storage device The voltage drop due to the internal resistance is reduced. The voltage value of the power storage device is increased by an amount corresponding to the decrease in voltage drop, and the input current value is decreased. Thereby, it is possible to increase the input voltage value to the voltage regulator and maintain the input power value while suppressing the input current value of the voltage regulator. Therefore, the output power value of the voltage regulator can be maintained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, a hybrid vehicle equipped with the control device for an electric system according to the present embodiment will be described. In this hybrid vehicle, an engine 100, an MG (Motor Generator) 200, an inverter 300, a battery 400, and an ECU (Electronic Control Unit) 900 are mounted. The control device according to the embodiment of the present invention is realized by a program executed by ECU 900. Although the present embodiment will be described using a hybrid vehicle equipped with engine 100, the present invention is not limited to a hybrid vehicle equipped with engine 100, but a hybrid vehicle equipped with a fuel cell instead of engine 100. (Fuel cell vehicle), an electric vehicle equipped with only the battery 400, or the like may be applied.

  The driving force generated by engine 100 is divided into two paths by power split mechanism 500. One is a path for driving the driving rod 600. The other is a path for driving MG 200 to generate power.

  MG200 is a three-phase AC motor. MG 200 generates power using the driving force of engine 100 divided by power split device 500. The electric power generated by MG 200 is converted from AC power to DC power by inverter 300 and then stored in battery 400. Note that the electric power after the voltage value is adjusted by the DC / DC converter may be stored in the battery 400.

  Further, MG 200 is driven by electric power stored in battery 400. The electric power stored in battery 400 is converted from DC power to AC power by inverter 300 and then supplied to MG 200. In addition, you may supply the electric power after adjusting a voltage value with a DC / DC converter to MG200.

  The driving force of MG 200 is transmitted to driving rod 600 via power split mechanism 500. Thereby, MG 200 assists engine 100 to cause the vehicle to travel, or causes the vehicle to travel only by the driving force from MG 200.

  On the other hand, at the time of regenerative braking of the hybrid vehicle, MG 200 is driven by drive rod 600 via power split mechanism 500, and MG 200 operates as a generator. Thereby, MG 200 acts as a regenerative brake that converts braking energy into electric power.

  The battery 400 is an assembled battery configured by connecting a plurality of battery modules in which a plurality of battery cells are integrated in series. The battery 400 has a high voltage (for example, about 300V). Note that a capacitor may be used instead of the battery 400.

  The electric power stored in the battery 400 is supplied to the MG 200, and after the voltage value is reduced to, for example, about 12V by the DC / DC converter 700, auxiliary electrical equipment such as a headlight, wiper, defogger, and air conditioner (Electric equipment) 800 is supplied. Auxiliary electrical equipment is not limited to headlights, wipers, defoggers, and air conditioners.

  ECU 900 receives signals representing detection results from input voltage sensor 902, output voltage sensor 904, and output current sensor 906. The input voltage sensor 902 detects the input voltage value VIN of the DC / DC converter 700. The output voltage sensor 904 detects the output voltage value VOUT from the DC / DC converter 700 to the auxiliary electrical equipment 800. The output current sensor 906 detects the output current value IOUT from the DC / DC converter 700 to the auxiliary equipment 800.

  ECU 900 is stored in the signal transmitted from each sensor, the driving state of the vehicle, the accelerator opening, the change rate of the accelerator opening, the shift position, the SOC (State Of Charge) of battery 400, and a memory (not shown). Arithmetic processing is performed based on maps and programs. Thereby, ECU 700 controls the devices mounted on the vehicle so that the vehicle is in a desired driving state.

  With reference to FIG. 2, a control structure of a program executed by ECU 900 of the control device for the electric system according to the present embodiment will be described.

  In step (hereinafter, step is abbreviated as S) 100, ECU 900 detects output current value IOUT from DC / DC converter 700 to auxiliary equipment 800 based on the signal transmitted from output current sensor 906. .

  In S102, ECU 900 detects an output voltage value VOUT from DC / DC converter 700 to auxiliary equipment 800 based on the signal transmitted from output voltage sensor 904.

  In S104, ECU 900 detects input voltage value VIN of DC / DC converter 700 based on the signal transmitted from input voltage sensor 902. In S106, ECU 900 calculates input current value IIN from inverter 300 and battery 400 to DC / DC converter 700 based on output current value IOUT, output voltage value VOUT, and input voltage value VIN.

  The input current value IIN may be calculated from the relationship between the input power value to the DC / DC converter 700 and the output power value from the DC / DC converter 700. For example, the input current value IIN may be calculated by dividing the sum of the output power value and the power loss value in the DC / DC converter 700 by the input voltage value VIN. Note that the input current value IIN may be directly detected by an input current sensor.

  In S108, ECU 900 determines that at least output current value IOUT is lower than the rated current value on the output side, or at least output voltage value VOUT is lower than a predetermined output voltage value VOUT (0), and input current value IIN is It is determined whether or not the input current value IIN is higher than a predetermined input current value IIN (0) and the input current value IIN is equal to or less than the rated current value on the input side.

  VOUT (0) is, for example, a voltage value required by auxiliary equipment 800 (voltage value that DC / DC converter 700 is trying to output). IIN (0) is a value that allows the input current value IIN to be considered close to the rated current value when the input current value IIN is larger than IIN (0). In the present embodiment, when the input current value IIN is higher than the predetermined input current value IIN (0), the input voltage value VIN is lower than the predetermined input voltage value.

  At least the output current value IOUT is lower than the rated current value on the output side, or at least the output voltage value VOUT is lower than the predetermined output voltage value VOUT (0), and the input current value IIN is the predetermined input current value. If it is higher than IIN (0) and input current value IIN is not more than the rated current value on the input side (YES in S108), the process proceeds to S200. If not (NO in S108), this process ends.

  In S200, ECU 900 determines whether electric power is being output from battery 400 to inverter 300 or not. That is, ECU 900 determines whether or not inverter 300 is operated and electric power is supplied from inverter 300 to MG 200. If power is being output from battery 400 to inverter 300 (YES in S200), the process proceeds to S202. If not (NO in S200), the process proceeds to S300. In S202, ECU 900 controls inverter 300 to limit (decrease) or stop output from battery 400 to inverter 300.

  In S300, ECU 900 determines whether or not the operation of inverter 300 is stopped. Whether or not the operation of the inverter 300 is stopped may be determined based on the operating states of the MG 200, the inverter 300, and the DC / DC converter 700, for example.

  If the operation of inverter 300 is stopped (YES in S300), the process proceeds to S302. If not (NO in S300), the process proceeds to S400. In S302, ECU 900 controls inverter 300 to start output of electric power from inverter 300 to battery 400 and DC / DC converter 700.

  In S400, ECU 900 determines whether or not electric power is being output from inverter 300 to battery 400 and DC / DC converter 700. Whether or not electric power is being output from inverter 300 to battery 400 and DC / DC converter 700 may be determined based on, for example, operating states of MG 200, inverter 300, and DC / DC converter 700.

  If power is being output from inverter 300 to battery 400 and DC / DC converter 700 (YES in S400), the process proceeds to S402. If not (NO in S400), this process ends. In S402, ECU 900 controls inverter 300 to increase the output of electric power from inverter 300 to battery 400 and DC / DC converter 700.

  The operation of ECU 900 of the control device for the electric system according to the present embodiment based on the above-described structure and flowchart will be described.

  During startup of the vehicle system, output current value IOUT, output voltage value VOUT, and input voltage value VIN of DC / DC converter 700 are detected (S100, S102, S104). Based on the detected output current value IOUT, output voltage value VOUT, and input voltage value VIN, an input current value IIN of the DC / DC converter 700 is calculated (S106).

  When at least the output current value IOUT is lower than the rated current value on the output side, or at least when the output voltage value VOUT is lower than the predetermined output voltage value VOUT (0), the output side of the DC / DC converter 700 is It can be said that there is a margin for increasing the output power.

  On the other hand, when the input current value IIN is higher than the predetermined input current value IIN (0) and the input current value IIN is equal to or less than the rated current value on the input side, the input current value IIN is close to the rated current value. In this state, even if the SOC of the battery 400 decreases and the voltage value of the battery 400 decreases, the input current value IIN cannot be increased.

  Therefore, at least the output current value IOUT is lower than the rated current value on the output side, or at least the output voltage value VOUT is lower than the predetermined output voltage value VOUT (0), and the input current value IIN is the predetermined input. If current value IIN (0) is higher and input current value IIN is less than or equal to the rated current value on the input side (YES in S108), the output power value may not be maintained even though there is a margin on the output side There is sex.

  Hereinafter, at least the output current value IOUT is lower than the rated current value on the output side, or at least the output voltage value VOUT is lower than the predetermined output voltage value VOUT (0), and the input current value IIN is the predetermined input. It is assumed that current value IIN (0) is higher and input current value IIN is equal to or lower than the rated current value on the input side (YES in S108).

  In this state (YES in S108), if power is being output from battery 400 to inverter 300 (YES in S200), the output from battery 400 to inverter 300 is limited (decreased) or stopped (S202). .

  When the output from the battery 400 to the inverter 300 is limited (decreased) or stopped (S202), the current flowing through the battery 400 decreases. Thereby, the voltage drop due to the internal resistance of battery 400 is reduced. Therefore, the voltage value of battery 400 increases by the amount that the voltage drop due to the internal resistance is reduced. As a result, it is possible to maintain the output power value while increasing the input voltage value VIN and decreasing the input current value IIN.

  On the other hand, when operation of inverter 300 is stopped (YES in S300), output of power from inverter 300 to battery 400 and DC / DC converter 700 is started (S302). At this time, if engine 100 is stopped, engine 100 is started and the electric power generated by MG 200 using the driving force of engine 100 is supplied from inverter 300 to battery 400 and DC / DC converter 700.

  In this case, the current output from battery 400 to DC / DC converter 700 is reduced by the amount of current corresponding to the power output from inverter 300 to DC / DC converter 700. As a result, the current flowing through the battery 400 is reduced, and the voltage drop due to the internal resistance of the battery 400 is reduced. Therefore, the voltage value of battery 400 increases by the amount that the voltage drop due to the internal resistance is reduced.

  Alternatively, the battery 400 is charged by the output of electric power from the inverter 300 to the battery 400, and the voltage rises due to the internal resistance of the battery 400. Therefore, the voltage value of the battery 400 becomes high. As a result, it is possible to maintain the output power value while increasing the input voltage value VIN and decreasing the input current value IIN.

  When operation of inverter 300 is not stopped (NO in S300) and power is being output from inverter 300 to battery 400 and DC / DC converter 700 (YES in S400), battery 400 and DC from inverter 300 are output. The power output to DC converter 700 is increased (S402).

  In this case, the current output from battery 400 to DC / DC converter 700 is reduced by the amount of current corresponding to the increased power output from inverter 300 to DC / DC converter 700. Thereby, the voltage drop due to the internal resistance of battery 400 is reduced. Therefore, the voltage value of battery 400 increases by the amount that the voltage drop due to the internal resistance is reduced.

  Alternatively, the amount of charge to battery 400 increases by the amount by which the output of power from inverter 300 to battery 400 is increased. Therefore, the voltage rises due to the internal resistance of battery 400, and the voltage value of battery 400 increases. As a result, it is possible to maintain the output power value while increasing the input voltage value VIN and decreasing the input current value IIN.

  As described above, the ECU of the control device for the electrical system according to the present embodiment increases the voltage value of the battery and increases the input voltage value of the DC / DC converter. Thereby, it is possible to maintain the input power value while suppressing the input current value. Therefore, it is possible to maintain the output power value while suppressing the input current value. As a result, the rated current value on the input side of the DC / DC converter can be suppressed, and the cost / size and weight of the DC / DC converter can be reduced.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a control block diagram which shows the vehicle carrying the control apparatus of the electric system which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program which ECU of the control apparatus of the electric system which concerns on embodiment of this invention performs.

Explanation of symbols

  100 Engine, 200 MG, 300 Inverter, 400 Battery, 500 Power split mechanism, 600 Driving rod, 700 DC / DC converter, 902 Input voltage sensor, 904 Output voltage sensor, 906 Output current sensor, 800 Auxiliary equipment, 900 ECU .

Claims (5)

A control device for an electric system including a power supply device, a voltage adjustment device connected to the power supply device, and an electric device to which electric power is supplied via the voltage adjustment device,
Means for detecting an output voltage value and an output current value from the voltage regulator to the electrical device;
Means for detecting an input voltage value from the power supply to the voltage regulator;
A means for calculating an input current value from the power supply device to the voltage regulator based on the detected output voltage value, output current value and input voltage value, or means for detecting the input current value;
If the predetermined condition is satisfied, the as input current value is low, at least one of the output voltage value and the output current value and based on the input voltage and the input current value, the Control means for controlling the electrical system ,
The condition is that at least one of a condition that the output voltage value is lower than a predetermined output voltage value and a condition that the output current value is lower than a predetermined output current value, and the input current value is A control device for an electrical system, which is a condition that the input current value is higher than a predetermined value . The power supply device is a power storage device,
Wherein, when the condition is satisfied, by increasing the voltage value of the electric storage device, so that the input current value is low, including means for controlling said electrical system, in claim 1 The control device of the electrical system described. The power supply device further includes an inverter connected to the power storage device,
The control means increases the voltage value of the power storage device by decreasing or stopping the power supply from the power storage device to the inverter and reducing the input current value when the condition is satisfied. 3. The electrical system controller of claim 2 , comprising means for controlling the electrical system. The power supply device further includes an inverter connected to the power storage device,
When the condition is satisfied , the control means increases the voltage supplied to the power storage device by increasing the power supplied from the inverter to the power storage device, so that the input current value decreases. 3. The electrical system controller of claim 2 , comprising means for controlling the electrical system. The power supply device further includes an inverter connected to the voltage regulator,
The control means increases the voltage value of the power storage device by increasing the power supplied from the inverter to the voltage regulator when the condition is satisfied, so that the input current value decreases. 3. The electrical system controller of claim 2 , comprising means for controlling the electrical system.

Images