JP2004249814A - Power consumption correction device and power consumption correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct the power consumption of equipment connected to a dc power supply to a proper one and increase the accuracy of the energy balance of a system including the dc power supply. <P>SOLUTION: When a running motor 26 is stopped, a DC/DC converter 30 is stopped, and an output voltage and an output current outputted from the dc power supply 20 are detected and the power consumption of an air conditioner 40, efficiency η of an inverter 42, and a correction value K used when the power consumption is calculated are acquired from an air conditioner ECU46. Then, a deviation between the product of the output voltage by the output current and a value obtained by dividing the power consumption by the product of the efficiency η by the correction value K is calculated. Based on the deviation, the correction value K is corrected, and the correction value K of the air conditioner ECU46 is updated with the corrected correction value K. As a result, the power consumption of the air conditioner 40 can be more appropriated, and the accuracy of the energy balance of an electric vehicle 10 can be increased. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power consumption correction device and a power consumption correction method, and more particularly, to a DC power supply, a load connected to the DC power supply via a first power conversion circuit, and a load connected to the DC power supply via a second power conversion circuit. The present invention relates to a power consumption correction device and a power consumption correction method for correcting power consumption of a target device in a system including a target device connected to the power supply.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of power consumption calculation device, a device that calculates the power consumption of an electric compressor connected to a DC power supply via an inverter has been proposed (for example, see Patent Document 1). This device includes a current sensor that detects a current input to the inverter and a voltage sensor that detects a voltage applied to the inverter, and calculates a product of the detected current and voltage to reduce the power consumption of the electric compressor. And
[0003]
[Patent Document 1]
JP-A-6-72135 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, such a power consumption computing device cannot verify whether or not the obtained power consumption is appropriate, and cannot perform correction if the power consumption is not appropriate. When a plurality of loads are connected to a DC power supply, it is necessary to obtain more accurate power consumption of devices connected to the DC power supply in order to more appropriately manage the energy balance of the system. If the calculated power consumption is inappropriate, it is necessary to correct the power consumption to an appropriate value.
[0005]
An object of the power consumption correction device and the power consumption correction method of the present invention is to correct power consumption of a device connected to a DC power supply to a more appropriate one. Another object of the power consumption correction device and the power consumption correction method of the present invention is to improve the accuracy of the energy balance of a system including a DC power supply.
[0006]
[Means for Solving the Problems and Their Functions and Effects]
The power consumption correction device and the power consumption correction method of the present invention employ the following means in order to achieve at least a part of the above object.
[0007]
The power consumption correction device of the present invention,
Consumption of target equipment in a system including a DC power supply, a load connected to the DC power supply via a first power conversion circuit, and a target equipment connected to the DC power supply via a second power conversion circuit A power consumption correction device for correcting power,
Output current voltage detection means for detecting the output current and output voltage of the DC power supply,
Power consumption acquisition means for acquiring power consumption of the target device from the target device,
When power conversion by the first power conversion circuit is not performed, based on the output current and the output voltage detected by the output current / voltage detection unit and the power consumption acquired by the power consumption acquisition unit, Correction means for correcting the power consumption of the target device;
The gist is to provide
[0008]
In the power consumption correction device of the present invention, when the power conversion by the first power conversion circuit interposed between the DC power supply and the load is not performed, the output current and the output voltage from the DC power supply are detected, and the DC power is corrected. The power consumption is obtained from the target device connected to the power supply via the second power conversion circuit, and the power consumption of the target device is corrected based on the detected output current and output voltage and the obtained power consumption. I do. That is, the power consumption of the target device is corrected using the physical quantities (output current and output voltage) on the side that supplies power to the target device. As a result, the power consumption of the target device can be corrected to a more appropriate one. Therefore, the accuracy of the energy balance of the system can be improved.
[0009]
In such a power consumption correction apparatus of the present invention, the target device includes: a supply current / voltage detection unit configured to detect a supply current and a supply voltage supplied to the second power conversion circuit; Power consumption calculating means for calculating power consumption based on the product of the power consumption and the efficiency of the second power conversion circuit; and power consumption storing means for storing the calculated power consumption. The device may be a unit that acquires the device power consumption from the power consumption storage unit included in the device.
[0010]
Further, in the power consumption correction device of the present invention, the correction means may include a first product of the detected output current and the output voltage, the obtained power consumption, and a reciprocal of an efficiency of the second power conversion circuit. And a means for correcting the power consumption of the target device based on a deviation from the second product.
[0011]
In the power consumption correction device according to the present invention, the system includes an auxiliary device connected to the DC power supply via a third power conversion circuit, and the correction unit performs power conversion by the second power conversion circuit. The power conversion unit may stop the power conversion by the third power conversion circuit when the power conversion is not performed and correct the power consumption of the target device. In this way, even in a system in which a plurality of devices are connected to a DC power supply, an opportunity to correct the power consumption of the target device to a more appropriate one can be obtained. As a result, the accuracy of the energy balance of the system can be improved.
[0012]
In the power consumption correction device of the present invention, the system is a drive system mounted on a vehicle, the load is a generator motor for traveling, and the DC power source is at least one of a secondary battery, a capacitor, and a fuel cell. The target device may be an air conditioner in a passenger compartment of a vehicle.
[0013]
The power consumption correction method of the present invention,
Consumption of target equipment in a system including a DC power supply, a load connected to the DC power supply via a first power conversion circuit, and a target equipment connected to the DC power supply via a second power conversion circuit A power consumption correction method for correcting electric power,
(A) detecting the output current and output voltage of the DC power supply and obtaining the power consumption of the target device when the power conversion by the first power conversion circuit is not performed;
(B) correcting the power consumption of the target device based on a deviation of a product of the detected output current and the output voltage, a product of the obtained power consumption, and a reciprocal of the efficiency of the second power conversion circuit. That is the gist.
[0014]
According to the power consumption correction method of the present invention, the output current and the output voltage from the DC power supply are detected when the power conversion by the first power conversion circuit interposed between the DC power supply and the load is not performed. And the power consumption of the target device connected to the DC power supply via the second power conversion circuit is obtained, and the power consumption of the target device is calculated based on the detected output current and output voltage and the obtained power consumption. Since the correction is performed, that is, the power consumption of the target device is corrected using the physical quantities (output current and output voltage) on the side that supplies power to the target device, so that the power consumption of the target device is corrected to a more appropriate one. can do. Therefore, the accuracy of the energy balance of the system can be improved.
[0015]
In such a power consumption correction method according to the present invention, the system includes an auxiliary device connected to the DC power supply via a third power conversion circuit, and the step (a) performs the power conversion by the third power conversion circuit. It may be a step of stopping the conversion and detecting the output current and the output voltage of the DC power supply. In this way, even in a system in which a plurality of devices are connected to a DC power supply, an opportunity to correct the power consumption of the target device to a more appropriate one can be obtained. As a result, the accuracy of the energy balance of the system can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram schematically illustrating a system configuration of an electric vehicle 10 equipped with a power consumption correction device according to an embodiment of the present invention. The electric vehicle 10 of the embodiment includes a DC power supply 20 such as a fuel cell or a secondary battery, a traveling motor 26 connected to the DC power supply 20 via a system main relay 22 and an inverter 24, and a DC power supply 20. , An auxiliary device 34 and a battery 32 connected to the vehicle via a system main relay 22 and a DC / DC converter 30, an air conditioner 40 as an air conditioner in a passenger compartment of the vehicle driven by electric power from the DC power supply 20, And an electronic control unit 50 for controlling the whole.
[0017]
The traveling motor 26 is configured, for example, as a well-known synchronous generator motor, and is connected to an axle attached to a drive wheel (not shown) so as to output traveling power. The traveling motor 26 outputs motive power by applying pseudo three-phase AC power obtained by converting DC power from the DC power supply 20 by turning on / off each switching element of the inverter 24.
[0018]
The DC / DC converter 30 is configured as a voltage conversion circuit that converts the DC power of the DC power supply 20 into DC power having a low voltage and supplies the DC power to the auxiliary device 34 and the battery 32. Is controlled based on the remaining capacity (SOC) of the vehicle. When the DC power supply 20 is a fuel cell, for example, the auxiliary device 34 corresponds to a fuel supply pump or the like. The battery 32 is configured as a secondary battery (for example, a lead battery) having a capacity that can supply power to the auxiliary device 34 when the DC / DC converter 30 is temporarily stopped.
[0019]
The air conditioner 40 includes an inverter 42 for converting DC power from the DC power supply 20 into three-phase AC power, a compressor 44 driven by the three-phase AC power from the inverter 42, and an operation panel (not shown) installed in the passenger compartment. And an air conditioner electronic control unit (hereinafter, referred to as an air conditioner ECU) 46 for controlling the driving of the compressor 44 by turning on and off the switching element of the inverter 42 based on the operation of A supply voltage Vinv from a voltage sensor 47 for detecting a voltage supplied to the inverter 42 and a supply current Iinv from a current sensor 48 for detecting a current supplied to the inverter 42 are supplied to the air conditioner ECU 46 via an input port (not shown). The air conditioner ECU 46 calculates the power consumption Pair of the air conditioner 40 by multiplying the product of the input supply voltage Vinv and the supply current Iinv by the efficiency η of the inverter 42 and the correction value K, and not shown. It is stored in the storage area. Note that the efficiency η and the correction value K of the inverter 42 are also stored in a storage area (not shown), and are taken out and used as needed.
[0020]
The electronic control unit 50 is configured as a microprocessor having a CPU 52 as a center. In addition to the CPU 52, a ROM 54 for storing a processing program and the like, a RAM 56 for temporarily storing data, an input / output port (not shown), It has a port. The electronic control unit 50 includes a phase current from a current sensor that detects a rotor position from a position detection sensor (not shown) attached to the traveling motor 26 and a current applied to the traveling motor 26 attached to the inverter 24. , An output voltage Vb from a voltage sensor 60 attached to an output terminal of the DC power supply 20, an output current Ib from a current sensor 62 also attached to an output terminal of the DC power supply 20, and the like are input via an input port. From the electronic control unit 50, a drive signal to the system main relay 22, a switching control signal to the inverter 24, a drive signal to the DC / DC converter 30, and the like are output via output ports. The electronic control unit 50 is connected to the air conditioner ECU 46 of the air conditioner 40 via a communication port. The electronic control unit 50 receives data from the air conditioner ECU 46 and transmits data to the air conditioner ECU 46 via the communication port as needed. I do.
[0021]
In the electric vehicle 10 of the embodiment thus configured, the voltage sensor 60, the current sensor 62, and the electronic control unit 50 function as a power consumption correction device that corrects the power consumption of the air conditioner 40. Hereinafter, a process of correcting the power consumption of the air conditioner 40 in the electronic control unit 50 functioning as the power consumption correction device will be described.
[0022]
FIG. 2 is a flowchart illustrating an example of a power consumption correction process performed by the electronic control unit 50. This process is repeatedly performed at predetermined time intervals. When the power consumption correction process is performed, the CPU 52 of the electronic control unit 50 first determines whether the traveling motor 26 has stopped (step S100). This determination can be made based on the switching control signal output to the inverter 24. When the traveling motor 26 is being driven, it is determined that the power consumption cannot be corrected, and the process ends.
[0023]
When the traveling motor 26 is stopped, the DC / DC converter 30 is stopped (step S110), and the output voltage Vb from the voltage sensor 60 and the output current Ib from the current sensor 62 are read (step S120). Then, the efficiency η of the inverter 42, the power consumption Pair of the air conditioner 40, and the correction value K are input by communication from the air conditioner ECU 46 of the air conditioner 40 (step S130). Then, the DC / DC converter 30 is returned to the normal drive (step S140), and the deviation ΔP is calculated by the following equation (1) (step S150). Here, in the equation (1), the first term on the right side is the power supplied from the DC power supply 20, and the second term on the right side is power obtained by converting the power consumption Pair calculated by the air conditioner ECU 46 into the supplied power side. It can be seen that if the correction value K is proper, the deviation ΔP becomes zero.
[0024]
(Equation 1)
ΔP = Ib · Vb−Pair / (K · η) (1)
[0025]
Then, the correction value K is corrected based on the deviation ΔP according to the following equation (2) (step S160), and the corrected correction value K is transmitted to the air conditioner ECU 46 of the air conditioner 40 (step S170). finish. In the embodiment, as shown in Expression (2), the correction value K is corrected by adding a function value obtained by using the deviation ΔP as an argument to the correction value K used so far. When the value is a positive value, the correction value K is adjusted to be small, and when the deviation ΔP is a negative value, the correction value K is adjusted to be greatly corrected. The air conditioner ECU 46 of the air conditioner 40 that has received the corrected correction value K updates the correction value K in a storage area (not shown) to the corrected correction value K. Therefore, the air conditioner ECU 46 uses the updated correction value K for the subsequent calculation of the power consumption Pair.
[0026]
K ← K + f (ΔP) (2)
[0027]
In the electric vehicle 10 of the embodiment described above, the correction value K used when calculating the power consumption Pair of the air conditioner 40 is determined by the physical quantity (output voltage Vb, output current Ib) on the power supply side to the air conditioner 40. Can be modified using Moreover, since the DC / DC converter 30 is stopped and the correction value K is corrected when the traveling motor 26 is stopped, the correction frequency of the correction value K can be increased. As a result, the power consumption Pair of the air conditioner 40 can be made more appropriate, and the accuracy of the energy balance of the electric vehicle 10 can be improved.
[0028]
In the electric vehicle 10 of the embodiment, the power consumption Pair of the air conditioner 40 is corrected by correcting the correction value K used when calculating the power consumption Pair of the air conditioner 40. The correction may correct the power consumption Pair of the air conditioner 40, or may correct the power consumption Pair by increasing or decreasing the deviation ΔP to the calculated power consumption Pair.
[0029]
In the electric vehicle 10 of the embodiment, the DC / DC converter 30 is stopped to correct the correction value K when the traveling motor 26 is stopped. However, the electric vehicle 10 does not include the battery 32 and the auxiliary machine 34. In other words, in a case where the DC / DC converter 30 is not provided, the correction value K may be corrected immediately when the traveling motor 26 is stopped.
[0030]
In the electric vehicle 10 of the embodiment, a fuel cell or a secondary battery can be used as the DC power supply 20. However, any DC power supply such as a fuel cell and a capacitor connected in parallel can be used. Can also be used.
[0031]
In the electric vehicle 10 according to the embodiment, the power consumption Pair of the air conditioner 40 that performs air conditioning of the passenger compartment is corrected, but the power consumption of other devices mounted on the electric vehicle 10 may be corrected.
[0032]
In the embodiment, the system mounted on the electric vehicle 10 has been described as an example. However, the present invention may be applied to a system mounted on a moving body such as a vehicle other than the electric vehicle, a ship, or an aircraft.
[0033]
In the embodiment, the embodiment as the power consumption correction device including the electronic control unit 50, the voltage sensor 60, and the current sensor 62 has been described. A method of correcting the power may be used.
[0034]
As described above, the embodiments of the present invention have been described using the examples. However, the present invention is not limited to these examples, and may be implemented in various forms without departing from the gist of the present invention. Obviously you can get it.
[Brief description of the drawings]
FIG. 1 is a configuration diagram schematically illustrating a system configuration of an electric vehicle 10 equipped with a power consumption correction device according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an example of a power consumption correction process performed by an electronic control unit 50.
[Explanation of symbols]
Reference Signs List 10 electric vehicle, 20 DC power supply, 22 system main relay, 24 inverter, 26 traveling motor, 30 DC / DC converter, 32 battery, 34 auxiliary equipment, 40 air conditioner, 42 inverter, 44 compressor, 46 air conditioner ECU, 47 voltage Sensor, 48 current sensor, 50 electronic control unit, 52 CPU, 54 ROM, 56 RAM, 60 voltage sensor, 62 current sensor.

Claims (7)

Consumption of target equipment in a system including a DC power supply, a load connected to the DC power supply via a first power conversion circuit, and a target equipment connected to the DC power supply via a second power conversion circuit A power consumption correction device for correcting power,
Output current voltage detection means for detecting the output current and output voltage of the DC power supply,
Power consumption acquisition means for acquiring power consumption of the target device from the target device,
When power conversion by the first power conversion circuit is not performed, based on the output current and the output voltage detected by the output current / voltage detection unit and the power consumption acquired by the power consumption acquisition unit, Correction means for correcting the power consumption of the target device;
A power consumption correction device comprising: The power consumption correction device according to claim 1,
The target device includes: a supply current / voltage detection unit that detects a supply current and a supply voltage supplied to the second power conversion circuit; and the detected supply current and the supply voltage, and an efficiency of the second power conversion circuit. Power consumption calculating means for calculating the power consumption by the product of, and power consumption storage means for storing the calculated power consumption,
The power consumption correction device, wherein the power consumption acquisition unit is a unit that acquires the device power consumption from the power consumption storage unit included in the target device. The correction unit is configured to calculate a first product of the detected output current and the output voltage, and a second product of a second product of the obtained power consumption and a reciprocal of an efficiency of the second power conversion circuit. 3. The power consumption correction device according to claim 1, wherein the power consumption correction device corrects power consumption of the target device. The power consumption correction device according to any one of claims 1 to 3,
The system includes an auxiliary device connected to the DC power supply via a third power conversion circuit,
The correction unit is a unit that stops the power conversion by the third power conversion circuit when the power conversion by the second power conversion circuit is not performed, and corrects the power consumption of the target device. Power consumption correction device. The power consumption correction device according to any one of claims 1 to 4,
The system is a drive system mounted on a vehicle,
The load is a generator motor for traveling,
The DC power supply is a power supply including at least one of a secondary battery, a capacitor, and a fuel cell,
The power consumption correction device is an air conditioner for a passenger compartment of a vehicle. Consumption of target equipment in a system including a DC power supply, a load connected to the DC power supply via a first power conversion circuit, and a target equipment connected to the DC power supply via a second power conversion circuit A power consumption correction method for correcting electric power,
(A) detecting the output current and output voltage of the DC power supply and obtaining the power consumption of the target device when the power conversion by the first power conversion circuit is not performed;
(B) correcting the power consumption of the target device based on a deviation of a product of the detected output current and the output voltage, a product of the obtained power consumption, and a reciprocal of the efficiency of the second power conversion circuit. Power consumption correction method. The power consumption correction method according to claim 6, wherein
The system includes an auxiliary device connected to the DC power supply via a third power conversion circuit,
The power consumption correction method, wherein the step (a) is a step of stopping power conversion by the third power conversion circuit and detecting an output current and an output voltage of the DC power supply.

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