JP7279009B2 - Power calculation device and power calculation method - Google Patents

Description

The present invention provides a power computing device that computes the power value of power supplied via a power line based on the voltage value of the voltage applied to the power line and the current value of the current flowing through the power line, and It relates to a power calculation method.

For example, the following patent document discloses a control drive device for an electric compressor for automobiles (an electric compressor constituting an air conditioner for automobiles). In this case, in an electric vehicle equipped with this control drive device, a configuration is adopted in which electric power stored in a battery is used to drive a driving motor to obtain power for driving. Further, the electric power stored in the battery is consumed not only by the driving motor but also by the electric compressor and the like. Therefore, in order to extend the distance that can be traveled by the electric power stored in the battery, it is necessary to suitably control the amount of electric power consumed by the electric compressor.

Therefore, in the invention disclosed in this patent document, in an inverter (an example of a "control drive device") that converts direct current supplied from a battery into alternating current and supplies it to an electric compressor, a power value of power consumption by the electric compressor is calculated. Then, a configuration is adopted in which the operating state of the electric compressor, that is, the amount of electric power consumed by the electric compressor is adjusted based on the calculation result.

Specifically, the inverter (control drive device) disclosed in this patent document converts the DC voltage and DC current on the input side (the voltage value and current value of the power line when power is being supplied from the battery to the inverter). DC voltage detection means and DC current detection means are provided for detecting and outputting to the control section. Also, in this inverter, the control section calculates the power value of the power consumed by the operation of the electric compressor based on the voltage value and the current value detected by the detecting means. At this time, when the calculated electric power value is equal to or higher than the allowable value, the control unit performs control to decrease the rotational speed of the electric compressor. As a result, the electric power consumption associated with the operation of the electric compressor is reduced, and as a result, it is possible to extend the travelable distance.

Japanese Patent Application Laid-Open No. 6-72135 (pages 4-5, Figures 1-4)

However, the control drive device disclosed in the above patent document has the following problems to be solved. Specifically, in the control drive device disclosed in the above patent document, the electric power value of the electric power consumed by the operation of the electric compressor of the air conditioner during actual use (when the automobile is used by the user) is intended to control. For this reason, the means for detecting the voltage and current values used to calculate the power value and the calculation unit for calculating the power value based on the detection results (voltage and current values) are installed in the vehicle permanently, specifically is provided in an inverter (control drive device) that supplies power to the electric compressor.

In this case, automobile developers (automobile manufacturers) and aftermarket parts manufacturers repeatedly run the automobile under various environments that assume actual use, and evaluate the driving performance and the operating state of the equipment. ing. Some such evaluation tasks require specifying the power value of the power consumed by any motor or electronic device. However, in the inverter (control drive device) disclosed in the above patent document, although the configuration necessary for calculating the power value is provided as a permanent device (inverter) of the automobile, the calculated power value and the calculation of the power value It is configured such that the detected voltage value and current value cannot be output to a device (external device) other than the permanent device of the vehicle.

Therefore, for example, when it becomes necessary to monitor "the value of power consumed by the operation of the air conditioner", an external It is necessary to connect a voltage measuring device and a current measuring device as devices to the power line from the battery to the inverter and measure the voltage value and the current value, respectively. For this reason, there is a problem that the cost of specifying the power value is soaring due to the need to prepare such measuring instruments.

In addition, among the power lines of automobiles and the like, a large current corresponding to the load flows through the power lines for air conditioners. For this reason, such power lines have their conductors covered with an insulator for safety reasons. Therefore, it is currently difficult to connect a voltage measuring device or a current measuring device as an external device to such a power line. Moreover, in order to connect a measuring instrument as an external device to such a power line, it is necessary to expose the conductor portion by peeling off the insulating coating or removing the protective cover. As a result, the insulation of the power line will be in a state different from that during actual use, which may make accurate evaluation difficult.

Although the problems associated with specifying power values in the field of automobiles have been exemplified, problems similar to those described above arise when specifying power values in fields other than automobiles, such as the field of mechanical equipment in factories. ing.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems to be solved, and provides a power calculation device and a power calculation method capable of specifying the power value of power supplied via a power line at low cost. The main purpose is Another object of the present invention is to provide a power calculation device and a power calculation method that can specify a power value in a state similar to an operational state during actual use.

In order to achieve the above object, a power computing device according to claim 1 periodically specifies a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line. and a processing unit that calculates the power value of the power supplied via the power line based on the specified voltage value and current value, the power calculation device comprising a serial bus for CAN communication a reading unit for reading a CAN frame transmitted through the serial bus from the serial bus, the reading unit reading a second voltage applied to the frame transmission conductor of the serial bus when the CAN frame is transmitted; a voltage detection unit having a non-contact voltage sensor capable of detecting a conductor without contact; and transmission via the serial bus based on a change in the voltage level of the second voltage detected by the voltage detection unit. a voltage value data frame as the CAN frame capable of specifying the voltage value; and a current value data frame as the CAN frame capable of specifying the current value. read from the serial bus and output to the processing unit, and the processing unit converts the voltage value specified based on the voltage value data frame and the current value specified based on the current value data frame into The power value is calculated based on

The power arithmetic device according to claim 2 periodically specifies the voltage value of the first voltage applied to the power line and the current value of the current flowing through the power line, and the specified voltage value and a processing unit for calculating a power value of the power supplied through the power line based on the current value, the CAN frame transmitted via a serial bus for CAN communication from the serial bus, and a current measuring unit that measures the current value and outputs current value data. a voltage detection unit having a non-contact voltage sensor capable of detecting an applied second voltage with respect to the frame transmission conductor without contact; and a voltage level of the second voltage detected by the voltage detection unit. and a frame identification unit that identifies the CAN frame transmitted via the serial bus based on a change in the voltage value data frame as the CAN frame that can identify the voltage value from the serial bus. output to the processing unit, and the processing unit calculates the power value based on the voltage value specified based on the voltage value data frame and the current value specified based on the current value data .

The power arithmetic device according to claim 3 is the power arithmetic device according to claim 2, wherein the current measurement unit is a non-contact type that can measure the current value without contacting the power supply conductor of the power line. It has a current sensor.

The power arithmetic device according to claim 4 periodically specifies the voltage value of the first voltage applied to the power line and the current value of the current flowing through the power line, and the specified voltage value and a processing unit for calculating a power value of the power supplied through the power line based on the current value, the CAN frame transmitted via a serial bus for CAN communication from the serial bus, and a voltage measurement unit that measures the voltage value and outputs voltage value data, wherein the reading unit is the current value data as the CAN frame that can specify the current value A frame is read from the serial bus and output to the processing unit, and the processing unit outputs the voltage value specified based on the voltage value data and the current value specified based on the current value data frame. The power value is calculated based on

The power arithmetic device according to claim 5 is the power arithmetic device according to claim 4, wherein the voltage measuring unit is a non-contact type voltage measuring unit capable of measuring the voltage value without contacting the power supply conductor of the power line. It has a voltage sensor.

According to a sixth aspect of the present invention, there is provided a power arithmetic device according to any one of the first to fifth aspects, wherein the reading unit is one of the plurality of serial buses through which the CAN frame is relayed via a repeater. read the CAN frame necessary for the calculation of the power value from the serial bus to which the CAN frame output device for outputting the CAN frame necessary for the calculation of the power value is connected.

The power arithmetic device according to claim 7 is the power arithmetic device according to any one of claims 4 to 6, wherein the reading unit includes a second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame. 2 voltage with respect to the frame transmission conductor without contact; and a frame specifying unit for specifying the CAN frame transmitted via the serial bus.

The power computing device according to claim 8 is the power computing device according to any one of claims 1 to 7, wherein a power value data frame is generated as the CAN frame capable of specifying the power value computed by the processing unit. and a CAN frame output unit for outputting to the serial bus.

The power calculation method according to claim 9 periodically specifies the voltage value of the first voltage applied to the power line and the current value of the current flowing through the power line, and the specified voltage value and a power calculation method for calculating a power value of power supplied via the power line based on the current value, the voltage of the CAN frame transmitted via a serial bus for CAN communication A voltage value data frame capable of specifying a value and a current value data frame capable of specifying the current value in the CAN frame are read from the serial bus, respectively, and the voltage specified based on the voltage value data frame. and the current value specified based on the current value data frame applied to the frame transmission conductor of the serial bus during transmission of the CAN frame. detecting the second voltage using a contactless voltage sensor capable of contactlessly detecting a voltage on the frame transmission conductor, and based on a change in the voltage level of the detected second voltage; Identify the CAN frame transmitted over the serial bus .

11. The power calculation method according to claim 10, wherein the voltage value of the first voltage applied to the power line and the current value of the current flowing through the power line are periodically specified, and the specified voltage value and a power calculation method for calculating a power value of power supplied via the power line based on the current value, the voltage of the CAN frame transmitted via a serial bus for CAN communication reading from the serial bus a voltage value data frame with an identifiable value and measuring the current value; a non-contact voltage sensor capable of detecting a second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame without contacting the frame transmission conductor when calculating the value; is used to detect the second voltage and to identify the CAN frame transmitted over the serial bus based on the detected voltage level change of the second voltage.

The power calculation method according to claim 11, wherein the voltage value of the first voltage applied to the power line and the current value of the current flowing through the power line are periodically specified, and the specified voltage value and a power calculation method for calculating a power value of power supplied via the power line based on the current value, the voltage value being measured and transmitted via a serial bus for CAN communication. read from the serial bus a current value data frame capable of specifying the current value among the CAN frames, and based on the measured voltage value and the current value specified based on the current value data frame, the power Calculate values.

The power calculation method according to claim 12 is the power calculation method according to any one of claims 9 to 11, wherein the power value of the plurality of serial buses through which the CAN frame is relayed via a repeater. The CAN frame required for calculating the power value is read from the serial bus to which the CAN frame output device that outputs the CAN frame required for calculation is connected.

A power calculation method according to claim 13 is the power calculation method according to claim 11 or 12 , wherein the second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame is applied to the frame transmission conductor. Detecting the second voltage using a contactless voltage sensor capable of contactlessly detecting the second voltage, and transmitting via the serial bus based on a change in voltage level of the detected second voltage Identify the CAN frame that has been processed.

A power calculation method according to claim 14 is the power calculation method according to any one of claims 9 to 13, wherein a power value data frame is generated as the CAN frame capable of specifying the calculated power value, and the serial output to the bus.

In the power computing device according to claim 1 and the power computing method according to claim 9, the voltage value data frame as a CAN frame capable of specifying the voltage value of the first voltage applied to the power line, and the power line A current value data frame as a CAN frame capable of specifying the current value of the current flowing through is read from the serial bus for CAN communication, and the voltage value specified based on the voltage value data frame and the current value data frame The power value of the power supplied through the power line is calculated based on the current value specified based on the current value.

Therefore, according to the power calculation device of claim 1 and the power calculation method of claim 9, the voltage value specified based on the voltage value data frame read from the serial bus and the current value read from the serial bus The voltage of the first voltage applied to the power supply conductor of the power line is calculated by calculating the power value of the power supplied through the power line based on the current value specified based on the data frame. The power value can be calculated at low cost, because the measuring device for measuring the value and the measuring device for measuring the current value of the current flowing through the power supply conductor of the power line are not required. .
Further, in this power calculation device and power calculation method, the second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame can be detected without contact with the frame transmission conductor. A sensor is used to detect the second voltage and to identify CAN frames transmitted over the serial bus based on changes in voltage level of the detected second voltage. Therefore, according to the power calculation device and the power calculation method, the CAN frame can be read out without peeling off the insulating coating covering the frame transmission conductor in each signal line of the serial bus. Therefore, it is possible to preferably avoid a state in which the insulation of the frame transmission conductor is deteriorated.

In the power computing device according to claim 2 and the power computing method according to claim 10, the voltage value data frame as a CAN frame capable of specifying the voltage value of the first voltage applied to the power line is used for CAN communication. reading from the serial bus of the power line and measuring the current value of the current flowing through the power line, and based on the voltage value specified based on the voltage value data frame and the measured current Calculate the power value of the power

Therefore, according to the power calculation device of claim 2 and the power calculation method of claim 10, based on the voltage value specified based on the voltage value data frame read from the serial bus and the measured current value, By calculating the power value of the power supplied through the power line, a measuring device for measuring the voltage value of the first voltage applied to the power supply conductor of the power line becomes unnecessary. Only the power value can be calculated at low cost.
Further, in this power calculation device and power calculation method, the second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame can be detected without contact with the frame transmission conductor. A sensor is used to detect the second voltage and to identify CAN frames transmitted over the serial bus based on changes in voltage level of the detected second voltage. Therefore, according to the power calculation device and the power calculation method, the CAN frame can be read out without peeling off the insulating coating covering the frame transmission conductor in each signal line of the serial bus. Therefore, it is possible to preferably avoid a state in which the insulation of the frame transmission conductor is deteriorated.

According to the power calculation device and the power calculation method according to claim 3, the current value is measured using a non-contact current sensor capable of measuring the current value without contact with the power supply conductor of the power line. As a result, the current value of the current flowing through the power supply conductor can be measured without peeling off the insulation coating covering the power supply conductor of the power line, so the power supply can be used to calculate the power value. It is possible to suitably avoid a state in which the insulation of the electric conductor is deteriorated, and to specify the electric power value in a state similar to the operating state in actual use.

In the power computing device according to claim 4 and the power computing method according to claim 11, the current value data frame as a CAN frame capable of specifying the current value of the current flowing through the power line is transmitted from the serial bus for CAN communication. reading and measuring the voltage value of the first voltage being applied to the power line; and based on the measured voltage value and the current value identified based on the current value data frame, the Calculate the power value of the power

Therefore, according to the power calculation device of claim 4 and the power calculation method of claim 11, based on the measured voltage value and the current value specified based on the current value data frame read from the serial bus, , by calculating the power value of the power supplied through the power line, the amount of power is reduced by eliminating the need for a measuring device for measuring the current value of the current flowing through the power supply conductor of the power line. Values can be computed at low cost.

According to the power calculation device and the power calculation method according to claim 5, the voltage value is measured using a non-contact voltage sensor capable of measuring the voltage value without contact with respect to the power supply conductor of the power line. As a result, the voltage value of the first voltage applied to the power supply conductor can be measured without peeling off the insulating coating covering the power supply conductor of the power line. Therefore, it is possible to suitably avoid a state in which the insulation of the power supply conductor is lowered, and it is possible to specify the power value in a state similar to the operating state during actual use.

According to the power calculation device of claim 6 and the power calculation method of claim 12, a CAN frame necessary for calculating a power value is selected from among a plurality of serial buses through which CAN frames are relayed via repeaters. By reading the CAN frame necessary for calculating the power value from the serial bus to which the output CAN frame output device is connected, the power value can be calculated without outputting a control command instructing the relay of the CAN frame to the repeater. Since the necessary CAN frames can be read and the relay of a large amount of CAN frames required for power value calculation from the serial bus to which the CAN frame output device is connected to another serial bus is avoided, The power value can be calculated without interfering with transmission of CAN frames on other serial buses.

In the power computing device according to claim 7 and the power computing method according to claim 13, the second voltage applied to the frame transmission conductors of the serial bus during CAN frame transmission is applied to the frame transmission conductors in a non-contact manner. A second voltage is detected using a non-contact voltage sensor detectable at and a CAN frame transmitted over the serial bus is identified based on a change in voltage level of the detected second voltage. Therefore, according to the power computing device of claim 7 and the power computing method of claim 13, the CAN frame can be read without peeling off the insulation covering the frame transmission conductor in each signal line of the serial bus. Therefore, it is possible to preferably avoid a state in which the insulation of the frame transmission conductor is degraded due to the calculation of the power value.

According to the power calculation device of claim 8 and the power calculation method of claim 14, by generating a power value data frame as a CAN frame that can specify the calculated power value and outputting it to the serial bus, The power value specified based on the output power value data frame can be used on the equipment side to which the calculated power value is supplied without having a configuration for calculating the power value.

1 is a configuration diagram showing an example configuration of an electric vehicle 100 and a power measurement system 10 (10A, 10B); FIG. 1 is a configuration diagram showing the configuration of a power measurement system 10; FIG. 2 is a configuration diagram showing the configuration of a recording device 2; FIG. 3 is a configuration diagram showing a configuration of a repeater 3; FIG. It is a block diagram which shows the structure of 10 A of power measurement systems. It is a block diagram which shows the structure of the power measurement system 10B. 3 is a configuration diagram showing the configuration of a voltage detection unit 50; FIG. 1 is a configuration diagram showing an example configuration of an electric vehicle 100A and power measurement system 10 (10A, 10B); FIG.

Embodiments of a power computing device and a power computing method will be described below with reference to the accompanying drawings.

The power computing device and the power computing method according to the present invention have a configuration in which power is supplied from a power supply to a load via a power line, and the voltage value of the voltage applied to the power line (the first voltage voltage value) and the current value of the current flowing through the power line are transmitted via a serial bus. As an example, an example of use in the electric vehicle 100 shown in FIG. 1 will be described below.

In this case, the electric vehicle 100 includes a driving battery 101, an auxiliary battery 102, a battery control unit 103, a voltage control unit 104, a charging mechanism 105, an inverter unit 106, a motor 107, an air conditioner control unit 108, an air conditioner 109, It includes a main control unit 110 and a serial bus SB1, and is detachably attached with a power measurement system 10, which is an example of a "power computing device." In the electric vehicle 100, illustration and detailed description of components that are not related to the specification of the power value by the power measurement system 10, which will be described later, are omitted.

The driving battery 101 is mainly composed of a secondary battery capable of storing electric power consumed by the running of the electric vehicle 100 . Auxiliary device battery 102 supplies power necessary for operating electronic devices such as battery control unit 103, voltage control unit 104, air conditioner control unit 108, main control unit 110, and repeater 3 of power measurement system 10, which will be described later. It consists of a secondary battery that can store electricity. The battery control unit 103 monitors the state of the drive battery 101 under the control of the main control section 110 and controls the power output from the drive battery 101 .

The voltage control unit 104 includes a DC/DC converter and is configured to be able to convert a voltage value, and is supplied from commercial alternating current via the power line L0, the charging mechanism 105 and the power line L1. A process of transmitting power supplied from a power generation mechanism that does not operate to drive battery 101 via power line L2 (a process of charging drive battery 101), and a charging mechanism from power supplied from drive battery 101 and commercial AC. 105 and power supplied from a power generation mechanism (not shown) to auxiliary battery 102 via power line L3 (processing for charging auxiliary battery 102). 110 to be executable.

Further, the voltage control unit 104 performs processing for transmitting power supplied from the drive battery 101 to the inverter unit 106 via the power line L4, and transmits power supplied from the drive battery 101 to the air conditioner control unit 108. The process of transmitting via line L6 can be executed under the control of main control unit 110. FIG. Charging mechanism 105 AC/DC-converts electric power supplied from commercial alternating current through electric power line L0, and transmits the converted electric power to voltage control unit 104 through electric power line L1.

Inverter unit 106 is configured to be capable of executing processing of DC/AC-converting power supplied from voltage control unit 104 and transmitting the converted power to motor 107 via power line L5 under the control of main control unit 110 . Motor 107 rotates the driving wheels of electric vehicle 100 (makes electric vehicle 100 run) with electric power supplied via inverter unit 106 .

The air conditioning equipment control unit 108 controls the main control unit 110 to perform a process of DC/AC converting the electric power supplied from the voltage control unit 104 and transmitting it to the air conditioning equipment 109 (electric compressor or heat generator) via the power line L7. configured to run under The air conditioner 109 adjusts the temperature inside the electric vehicle 100 by driving the electric compressor to generate cool air or by using the heat generator to generate warm air using the power supplied from the air conditioner control unit 108 .

Main control unit 110 comprehensively controls each electronic device of electric vehicle 100 . In this case, in the electric vehicle 100 of this example, various processes are executed under the control of a detector (such as a sensor unit: not shown) for detecting the operating state of each part of the electric vehicle 100 and the main control unit 110. (Battery control unit 103, voltage control unit 104, inverter unit 106, air conditioner control unit 108, etc.) are connected to a serial bus SB1 (an example of an in-vehicle communication network corresponding to a "serial bus for CAN communication"). It is In this case, the signal lines (such as "CANH (CAN high)", "CANL (CAN low)" and "SG" signal lines) constituting the serial bus SB1 and the serial bus SB2 in the power measurement system 10 described later are It is configured with an insulation-coated conductor (an example of a “frame transmission conductor”).

The main control unit 110 also controls the CAN frame Fc output from the detector to the serial bus SB1 so that the detection result by the detector can be specified, and the CAN frame Fc that is output from the electronic device to the serial bus SB1 so that the operating state of the electronic device can be specified. The operating state of each part of the electric vehicle 100 is specified by acquiring the CAN frame Fc. Further, main control unit 110 outputs a CAN frame Fc that can specify a control command for controlling each electronic device to serial bus SB1 according to the operating program according to the specified operating state. As a result, each electronic device executes a predetermined process according to the control command specified based on the CAN frame Fc. Since CAN communication (transmission of CAN frames) by various nodes such as detectors and electronic devices connected to the serial bus SB1 (communication network for CAN communication) is well known, detailed description thereof will be omitted.

On the other hand, the power measurement system 10 is an example of a "power calculation device" configured to be able to calculate a power value according to a "power calculation method". 2, a repeater 3 and a serial bus SB2. Further, the power calculation device 1 is, for example, a device that can be attached to and detached from a power calculation target facility such as an electric vehicle 100. As shown in FIG. , a signal output unit 14 , a processing unit 15 and a storage unit 16 .

The voltage detection unit 11 corresponds to a "voltage detection unit" and includes a clamp-type non-contact voltage sensor 11a, which is an example of a "non-contact voltage sensor." Configure the reading unit that reads from the serial bus. Specifically, according to the control of the processing unit 15, the voltage detection unit 11 applies the voltage to the frame transmission conductor of the serial bus SB1 when various CAN frames Fc are transmitted from various devices to the serial bus SB1, as will be described later. A voltage (an example of a “second voltage”) is detected in a non-contact manner with respect to the frame transmission conductor via the non-contact voltage sensor 11a, and information enabling identification of the voltage level of the detected voltage is output to the processing unit 15. do.

The operation unit 12 includes a plurality of operation switches (not shown) capable of setting operating conditions of the power calculation device 1 (conditions related to calculation of power, notification and recording of calculation results, etc.). The operation signal is output to the processing unit 15 . The display unit 13 displays, under the control of the processing unit 15, the operation state of the power calculation device 1, the calculation result (calculated power value) by the processing unit 15, and the like. The signal output unit 14 constitutes a "CAN frame output unit" together with the processing unit 15 and the repeater 3, and as described later, outputs a CAN frame generated by the processing unit 15 so that the calculated power value can be specified. By outputting the power value data frame Fcp as Fc to the serial bus SB2, the repeater 3 executes processing for relaying the power value data frame Fcp to the serial bus SB1.

The processing unit 15 comprehensively controls the power calculation device 1 . Specifically, the processing unit 15 functions as a “frame identification unit” and detects changes in the “voltage level” of the voltage detected by the voltage detection unit 11 when the CAN frame Fc is transmitted over the serial bus SB1 of the electric vehicle 100. based on the process of specifying the CAN frame Fc being transmitted over the serial bus SB1 (process of functioning as a "reading unit" and outputting the specified CAN frame Fc to the processing unit 15 itself as a "processing unit": "voltage (an example of the process of "periodically specifying the value and the current value") is executed.

Further, the processing unit 15 functions as a “processing unit”, and the “voltage value” specified based on the voltage value data frame Fcv (an example of the “voltage value data frame”) in the CAN frame Fc, and the CAN A process of calculating the power value of the power supplied via the power line based on the "current value" specified based on the current value data frame Fca (an example of the "current value data frame") of the frame Fc to run. Further, the processing unit 15 generates a power value data frame Fcp that can identify the calculated power value, outputs the power value data frame Fcp from the signal output unit 14 to the serial bus SB2, and, as will be described later, outputs data to the recording device based on the power value data frame Fcp. 2 is recorded in the recording device 2, and the power value data frame Fcp is output to the serial bus SB1 via the repeater 3. In addition, the processing unit 15 causes the display unit 13 to display the calculated power value. It should be noted that the specific contents of each of the above processes performed by the processing unit 15 will be described later in detail.

The storage unit 16 stores the operation program of the processing unit 15, the frame identification data for identifying the CAN frame Fc, and the calculation result (calculated power value) of the processing unit 15. FIG.

The recording device 2 includes a recording medium 21, a data input/output unit 22, a processing unit 23, and a storage unit 24, as shown in FIG. The recording medium 21 is composed of a large-capacity recording medium such as an HDD or SSD, and records various data (such as power value data Dp, which will be described later) under the control of the processing section 23 . Under the control of the processing unit 23, the data input/output unit 22 transmits each data input from an external device (portable electronic terminal, etc.) to the processing unit 23 to record it on the recording medium 21, or record it on the recording medium 21. The stored data is output to an external device (portable electronic terminal, etc.).

The processing unit 23 comprehensively controls the recording device 2 . Specifically, the processing unit 23 acquires the power value data frame Fcp output to the serial bus SB2 by the power calculation device 1 (signal output unit 14), and calculates the power value based on the acquired power value data frame Fcp. Data Dp is generated and recorded on the recording medium 21 . Further, when various data are transmitted from an external device via the data input/output unit 22, the processing unit 23 records the data in the recording medium 21, and outputs power values from the recording medium 21 in accordance with a request from the external device. The data Dp and the like are read out and output to an external device via the data input/output unit 22 . The storage unit 24 stores an operation program of the processing unit 23, frame identification data for identifying the CAN frame Fc, and the like.

The repeater 3 is, for example, a device permanently installed on the serial bus SB1 of the electric vehicle 100 (a device for outputting the CAN frame Fc output from a device other than the components of the electric vehicle 100 to the serial bus SB1). As shown in FIG. 4, it includes a voltage detection section 31, a signal output section 32, a processing section 33 and a storage section .

The voltage detection unit 31 includes a clamp-type non-contact voltage sensor 31a similar to the non-contact voltage sensor 11a in the same manner as the voltage detection unit 11 in the power computing device 1, and together with the processing unit 33, " A [reading unit] for reading the CAN frame Fc from the serial bus SB2 is constructed. Specifically, according to the control of the processing unit 33, the voltage detection unit 31 applies the voltage to the frame transmission conductor of the serial bus SB2 when the power value data frame Fcp is output from the power calculation unit 1 to the serial bus SB2. The voltage value of the voltage is measured in a non-contact manner with respect to the frame transmission conductor via the non-contact voltage sensor 31 a and the measurement result is output to the processing section 33 .

The signal output unit 32 is always connected to the serial bus SB1, and outputs the power value data frame Fcp to the serial bus SB1 under the control of the processing unit 33. The processing unit 33 comprehensively controls the repeater 3 . Specifically, the processing unit 33 functions as a “frame identification unit” like the processing unit 15 of the power calculation device 1, and when the power value data frame Fcp is output from the power calculation device 1 to the serial bus SB2, 2, based on the change in the voltage value detected (measured) by the voltage detection unit 31, a process of identifying the power value data frame Fcp transmitted over the serial bus SB2 is executed.

Further, the processing unit 33 outputs the specified power value data frame Fcp to the signal output unit 32, thereby causing the signal output unit 32 to output the power value data frame Fcp to the serial bus SB1. The specific contents of each of the above processes performed by the processing unit 33 will be described in detail later. The storage unit 34 stores an operation program of the processing unit 33 and frame identification data for identifying the CAN frame Fc.

Next, an example of each process of specifying a power value by the power measurement system 10 and displaying and recording the specified power value will be described. As described above, the repeater 3 is assumed to be connected to the serial bus SB1 of the electric vehicle 100 (permanently installed in the electric vehicle 100 as one of the equipment of the electric vehicle 100). do. Further, it is assumed that charging of driving battery 101 via charging mechanism 105 and the like has already been completed.

As an example, when the power measurement system 10 specifies the power value of the power consumed by the operation of the air conditioner 109 in the electric vehicle 100, as shown in FIGS. The non-contact voltage sensor 11a in the section 11 is attached to the serial bus SB1 of the electric vehicle 100 (the signal line of the serial bus SB1 is clamped by the non-contact voltage sensor 11a), and the repeater connected to the serial bus SB1. 3 is attached to the serial bus SB2 of the power measuring system 10 (the signal line of the serial bus SB2 is clamped by the non-contact voltage sensor 31a).

Note that FIG. 1 and the like show a state in which one non-contact voltage sensor 11a is attached to the serial bus SB1 and one non-contact voltage sensor 31a is attached to the serial bus SB2. Actually, in order to detect the voltage values of "CANH" and "CANL" on the serial bus SB1, separate non-contact voltage sensors 11a are attached to both signal lines, and "CANH" on the serial bus SB2 is mounted. and a separate non-contact voltage sensor 31a for each signal line to detect the voltage value for each "CANL". In order to facilitate understanding of the principle of operation of the power measurement system 10, the operation of each unit will be described below without distinguishing between "CANH" and "CANL".

At this time, by attaching the non-contact voltage sensor 11a to the serial bus SB1, the frame transmission conductors of the signal lines constituting the serial bus SB1 and the electrodes of the non-contact voltage sensor 11a are separated from each other by the insulating coating of the signal lines. The conductor for frame transmission and the electrode are in a state of being capacitively coupled. By attaching the non-contact voltage sensor 31a to the serial bus SB2, the frame transmission conductors of the signal lines constituting the serial bus SB2 and the electrodes of the non-contact voltage sensor 31a are connected through the insulating coating of the signal lines. They are brought close to each other, and the frame transmission conductor and the electrode are capacitively coupled.

On the other hand, in the electric vehicle 100, when an instruction is given by operating the operation panel (not shown) to perform air conditioning to an arbitrary room temperature, the air conditioner control unit 108 outputs to the serial bus SB1 by a temperature sensor (not shown), for example. CAN frame Fc (the CAN frame Fc that can specify the outside temperature and the CAN frame Fc that can specify the room temperature), and the CAN frame Fc that is output to the serial bus SB1 by the battery control unit 103 (the remaining battery capacity, etc. can be specified). possible CAN frame Fc, etc.), it is determined how to operate the air conditioner 109 to achieve the indicated room temperature. At this time, as an example, it is determined to operate the electric compressor of the air conditioner 109 to lower the room temperature.

Next, the air conditioner control unit 108 outputs to the serial bus SB1 a CAN frame Fc requesting power supply for operating the air conditioner 109 (electric compressor) in an arbitrary operating state. Voltage control unit 104 adjusts the power supplied from drive battery 101 through power line L2 to a predetermined voltage value in accordance with CAN frame Fc output from air conditioner control unit 108 to serial bus SB1. The voltage value (" a voltage value data frame Fcv capable of specifying a "voltage value"), and a current value data frame Fca capable of specifying a current value (an example of a "current value") flowing through the supply conductor of the power line L6. is output to the serial bus SB1.

In addition, the air conditioner control unit 108 controls the power line according to the voltage value specified based on the voltage value data frame Fcv transmitted over the serial bus SB1 and the current value specified based on the current value data frame Fca. The power supplied via L6 is DC/AC converted and supplied to the air conditioner 109 . As a result, the electric compressor of the air conditioner 109 operates and the room temperature is lowered by the refrigeration circuit.

In this state, when the power measurement system 10 specifies the power value of the power consumed by the operation of the air conditioner 109 (the power supplied from the voltage control unit 104 to the air conditioner control unit 108), power calculation By operating the operation unit 12 of the apparatus 1, the start of processing is instructed. At this time, the processing unit 15 first starts reading the CAN frame Fc (voltage value data frame Fcv, current value data frame Fca, etc.) transmitted via the serial bus SB1.

In this case, the CAN frame Fc being transmitted via the serial bus SB1 is the voltage applied to the frame transmission conductor of the signal line corresponding to "CANH" (the frame transmission conductor of the signal line corresponding to "SG"). (the potential of the frame transmission conductor of the signal line corresponding to "CANH"), and the voltage applied to the frame transmission conductor of the signal line corresponding to "CANL" (the signal line corresponding to "SG") is transmitted by the "two-wire differential voltage method" based on the fluctuation of the potential of the frame transmission conductor of the signal line corresponding to "CANL" with respect to the potential of the frame transmission conductor of . Since the transmission method of this CAN frame Fc is well known, a detailed description thereof will be omitted. Reading of the CAN frame Fc (voltage value data frame Fcv and current value data frame Fca) will be described.

In this case, when the CAN frame Fc is transmitted, the voltage of the frame transmission conductor of the signal line corresponding to "CANH" (hereinafter also simply referred to as "transmission conductor") and the voltage of the signal line corresponding to "SG" for transmission When the potential difference from the voltage of the conductor (that is, the voltage of the reference potential in the voltage detection unit 11) increases, the current of the current signal flows from the transmission conductor to the electrode of the non-contact voltage sensor 11a via capacitive coupling. increase in quantity. Also, during the transmission of the CAN frame Fc, the potential difference between the voltage of the transmission conductor corresponding to "CANH" and the voltage of the transmission conductor corresponding to "SG" (the voltage of the reference potential in the voltage detection unit 11) decreases. When this is done, the current amount of the current signal flowing from the transmission conductor to the electrode of the non-contact voltage sensor 11a via capacitive coupling decreases.

Therefore, in the power calculation device 1 in the power measurement system 10 of the present example, as an example, the voltage detection unit 11 causes the electrode of the non-contact voltage sensor 11a to have the same potential as the transmission conductor of "CANH" and the above current The potential of the electrode is feedback-controlled so that the value becomes "0", and the potential of the electrode is measured in this state to determine the "voltage level" of the voltage applied to the transmission conductor of "CANH". ” is repeatedly executed at a predetermined cycle. Also, the voltage detection unit 11 sequentially outputs voltage data indicating the identification result (voltage level) to the processing unit 15 .

In response to this, the processing unit 15 identifies the contents of the CAN frame Fc transmitted via the serial bus SB1 based on the voltage value indicated by the voltage data output from the voltage detection unit 11, and stores the information in the storage unit 16. be memorized. Specifically, the voltage of the electrode capacitively coupled to the transmission conductor corresponding to "CANH" exceeds a predetermined voltage level and the electrode capacitively coupled to the transmission conductor corresponding to "CANL" is below a predefined voltage level (when the potential difference between CANH and CANL exceeds a predefined level), a digital signal "0" is transmitted and discriminate. In addition, the voltage of the electrode capacitively coupled to the transmission conductor corresponding to "CANH" is below a predetermined voltage level and the voltage of the electrode capacitively coupled to the transmission conductor corresponding to "CANL" is When the voltage level is equal to or higher than a predetermined voltage level (when the potential difference between "CANH" and "CANL" is equal to or lower than a predetermined level), it is determined that the digital signal "1" is being transmitted.

In this manner, by sequentially determining which of the digital signals "0" and "1" is being transmitted based on the voltage of the electrodes of the non-contact voltage sensor 11a, the non-contact voltage sensor 11a is installed. The voltage value data frame Fcv and the current value data frame Fca that are being transmitted via the serial bus SB1 are specified. During operation of the air conditioner 109, various CAN frames Fc other than the voltage value data frame Fcv and the current value data frame Fca are output to the serial bus SB1. The CAN frames Fc other than the data frames Fca are also specified, but the CAN frames Fc that are unnecessary for the calculation of the power value are not used, and the voltage value data frame Fcv and the current value data frame Fca are used to perform the following processing. to run.

In addition, the processing unit 15 determines the voltage value specified based on the specified voltage value data frame Fcv (the “voltage value” of the “first voltage” applied to the supply conductor of the power line L6), and the current The current value specified based on the value data frame Fca (the “current value” of the “current” flowing through the supply conductor of the power line L6) is displayed on the display unit 13 . Further, based on the specified voltage value and current value, the processing unit 15 controls the electric power supplied from the voltage control unit 104 of the electric vehicle 100 to the air conditioner control unit 108 via the power line L6 ( power consumption) is calculated, and the calculated power value is displayed on the display unit 13 .

Further, the processing unit 15 generates a power value data frame Fcp that can identify the calculated power value, and causes the signal output unit 14 to output the generated power value data frame Fcp to the serial bus SB2. At this time, in the recording device 2, the processing unit 23 acquires the power value data frame Fcp output to the serial bus SB2, and the power value indicating the power value specified based on the acquired power value data frame Fcp. Data Dp is generated and recorded on the recording medium 21 . Thereby, the power value calculated by the power calculation device 1 is recorded in the recording device 2 (recording medium 21).

On the other hand, in the power measurement system 10 of this example, in parallel with the processing of power value calculation by the power calculation device 1 and the processing of recording the power value data Dp by the recording device 2, the repeater 3 performs A process of outputting (relaying) the transmitted CAN frame Fc (power value data frame Fcp in this example) to the serial bus SB1 is executed.

In this case, the voltage of the transmission conductor corresponding to "CANH" on the serial bus SB2 and the voltage of the transmission conductor corresponding to "CANH" on the serial bus SB2 also when transmitting the CAN frame Fc on the serial bus SB2 in the same manner as when transmitting the CAN frame Fc on the serial bus SB1. , and the voltage of the transmission conductor corresponding to "SG" (that is, the voltage of the reference potential in the voltage detection unit 31) increases, the capacitance from the transmission conductor to the electrode of the non-contact voltage sensor 31a increases. The amount of current in the current signal flowing through the coupling increases. Also, when the CAN frame Fc is transmitted on the serial bus SB2, the voltage of the transmission conductor corresponding to "CANH" and the voltage of the transmission conductor corresponding to "SG" (the voltage of the reference potential in the voltage detection unit 31) When the potential difference between and decreases, the current amount of the current signal flowing from the transmission conductor to the electrode of the non-contact voltage sensor 31a via capacitive coupling decreases.

Therefore, in the repeater 3 in the power measurement system 10 of the present example, the voltage detection section 31 detects that the electrode of the non-contact voltage sensor 31a is "CANH" in the same manner as the voltage detection section 11 in the power calculation device 1 described above. The potential of the electrode is feedback controlled so that the potential of the transmission conductor becomes the same and the above current value becomes "0". A process of specifying (measuring) the voltage value of the voltage applied to the conductor is repeatedly executed at a predetermined cycle. In addition, the voltage detection unit 31 sequentially outputs voltage data indicating measurement results (voltage values) to the processing unit 33 .

In response to this, the processing unit 33, based on the voltage value indicated by the voltage data output from the voltage detection unit 31, determines the CAN frame Fc transmitted via the serial bus SB2 (in this example, the power arithmetic unit 1 The content of the power value data frame Fcp) output from the signal output unit 14 is specified and output from the signal output unit 32 to the serial bus SB1. As a result, the power measurement system 10 outputs the power value data frame Fcp to the serial bus SB<b>1 of the electric vehicle 100 . Therefore, for example, the main control unit 110 acquires the power value data frame Fcp transmitted via the serial bus SB1, and uses the power supplied via the power line L6 (consumed by the operation of the air conditioner 109). power) is grasped, and predetermined processing is executed, for example, in the test operation mode.

Although detailed description is omitted, various CAN frames Fc other than the power value data frame Fcp output from the power arithmetic unit 1 may be output to the serial bus SB2. At this time, in the power measurement system 10 (repeater 3) of the present example, as an example, the processing unit 33 identifies various CAN frames Fc, and only predetermined CAN frames Fc among the identified CAN frames Fc is output to the serial bus SB1. As a result, any CAN frame Fc that can be used in the electric vehicle 100 is output to the serial bus SB1 via the repeater 3. FIG.

After that, the power calculation device 1, the recording device 2, and the repeater 3 perform the above-described processing until a series of processing of calculation, display, and recording of the power value is instructed by operating the operation unit 12 of the power calculation device 1. Continuously repeat.

On the other hand, when the processing as described above is completed and it is no longer necessary to continue the calculation, display, and recording of power values by the power measurement system 10, the components (the power calculation device 1, the recording device 2, and the power calculation device 1, the recording device 2, and the The serial bus SB2) is removed from the electric vehicle 100.

At this time, in the power measurement system 10 of this example, the non-contact voltage sensor 11a of the voltage detection unit 11 in the power arithmetic unit 1 is in a non-contact state (the signal line is non-contact) with respect to the transmission conductor of the serial bus SB1. (clamped by the voltage sensor 11a) is employed to specify a change in the "voltage level" accompanying the transmission of the CAN frame Fc. Therefore, when the non-contact voltage sensor 11a is removed from the serial bus SB1, the insulation of the transmission conductor is prevented from deteriorating from the state before the non-contact voltage sensor 11a is attached.

Further, the repeater 3, which reads the CAN frame Fc (power value data frame Fcp) from the serial bus SB2 and outputs it to the serial bus SB1, remains attached to the electric vehicle 100 as a permanent device of the electric vehicle 100. FIG. Therefore, it is possible to avoid the situation where the insulation of the transmission conductor of the serial bus SB1 is deteriorated due to the presence of the component for outputting the CAN frame Fc to the serial bus SB1.

Thus, a series of operations related to calculation of power values and the like by the power measurement system 10 are completed. Further, the power value data Dp recorded in the recording device 2 (recording medium 21) by the above work can be recorded by connecting various information processing terminals as external devices to the data input/output unit 22 of the recording device 2. The information can be output from the device 2 to the information processing terminal. As a result, the power value data Dp can be analyzed by the information processing terminal as an external device, and arbitrary information about the power value can be displayed/printed.

Thus, in the power measurement system 10 and its power calculation method, the voltage value data frame Fcv (CAN frame Fc) capable of specifying the "voltage value" of the "first voltage" applied to the power line L6 , and a current value data frame Fca (CAN frame Fc) capable of specifying the "current value" of the current flowing through the power line L6 from the serial bus SB1 for CAN communication, and specified based on the voltage value data frame Fcv and the current value specified based on the current value data frame Fca, the power supplied through the power line L6 (in this example, the The "power value" of the power supplied from the voltage control unit 104 to the air conditioner control unit 108 is calculated.

Therefore, according to the power measurement system 10 and power calculation method, the "voltage value" specified based on the voltage value data frame Fcv read from the serial bus SB1 and the current value data frame Fca read from the serial bus SB1 By calculating the "power value" of the power supplied through the power line L6 based on the "current value" specified based on the The measuring device for measuring the "voltage value" of the "voltage" and the measuring device for measuring the "current value" of the current flowing through the power supply conductor of the power line L6 are unnecessary. power value” can be calculated at low cost.

Further, in this power measurement system 10 and its power calculation method, the "second voltage" applied to the frame transmission conductors of the serial bus SB1 during transmission of the CAN frame Fc can be applied to the frame transmission conductors without contact. A "second voltage" is detected using the detectable non-contact voltage sensor 11a, and a change in "voltage level" of the detected "second voltage" is transmitted via the serial bus SB1. identify the CAN frame Fc. Therefore, according to the power measurement system 10 and the power calculation method, the CAN frame Fc can be read without peeling off the insulation covering the frame transmission conductors of the signal lines of the serial bus SB1. It is possible to preferably avoid a state in which the insulation of the frame transmission conductor is degraded due to computation.

Further, according to the power measurement system 10 and its power calculation method, a power value data frame Fcp (CAN frame Fc) capable of identifying the calculated "power value" is generated and output from the repeater 3 to the serial bus SB1. By doing so, the power value specified based on the power value data frame Fcp output from the power measurement system 10 without having a configuration for calculating the power value on the equipment side to which the calculated power value is supplied can be used.

Next, another embodiment of the "power computing device" and the "power computing method" will be described with reference to the accompanying drawings. Components similar to those of the power measurement system 10 described above are denoted by the same reference numerals, and overlapping descriptions are omitted.

A power measuring system 10A shown in FIG. 5 is another example of a "power computing device" configured to be able to compute a power value according to a "power computing method". Instead, it includes a power computing device 1A, a recording device 2, a repeater 3 (none of which are shown), and a serial bus SB2. Further, the power calculation device 1A is a device that can be attached to and detached from the electric power calculation target equipment such as the electric vehicle 100 like the power calculation device 1, and includes a voltage detection unit 11, an operation unit 12, a display unit 13, and a signal output unit. It includes a section 14 , a processing section 15 , a storage section 16 , and a current measuring section 17 .

The current measuring unit 17 corresponds to a "current measuring unit" and includes a clamp-type non-contact current sensor 17a, which is an example of a "non-contact current sensor." The current measurement unit 17 measures the current value (“current value”) is measured in a non-contact manner with respect to the supply conductor via the non-contact current sensor 17a, and current value data Da (an example of “current value data”) indicating the measurement result is output to the processing unit 15. do.

When calculating (measuring), displaying, and recording the power value by the power measurement system 10A, as shown in FIG. The signal line of the serial bus SB1 is clamped by the non-contact voltage sensor 11a), and the non-contact voltage sensor 31a in the voltage detection unit 31 of the repeater 3 connected to the serial bus SB1 is clamped to the serial bus of the power measurement system 10A. SB2 (the signal line of the serial bus SB2 is clamped by the non-contact voltage sensor 31a), and further, the non-contact current sensor 17a is mounted on the power line L6 of the electric vehicle 100 (the power line L6 is clamped by the current sensor 17a). At this time, by attaching the non-contact current sensor 17a to the power line L6, the supply conductor of the power line L6 and the detection coil of the non-contact current sensor 17a are connected to the insulation coating of the electric wire and the non-contact current sensor 17a. are brought close to each other through the casing of the .

Next, in a state where power is being supplied from the voltage control unit 104 to the air conditioner control unit 108 via the power line L6, the operation unit 12 of the power calculation device 1A is operated to instruct the start of processing. At this time, the processing unit 15 first starts reading the CAN frame Fc (voltage value data frame Fcv, etc.) transmitted via the serial bus SB1. Since the identification of the CAN frame Fc by the voltage detection unit 11 is the same as the above-described processing in the power calculation device 1, detailed description thereof will be omitted. Thereby, the voltage value data frame Fcv that can specify the "voltage value" of the "first voltage" applied to the supply conductor of the power line L6 is specified.

In parallel with reading the voltage value data frame Fcv, the processing unit 15 controls the current measurement unit 17 to start measuring the "current value". In response to this, the current measurement unit 17 measures the current value of the current flowing through the supply conductor of the power line L6 to generate current value data Da, and outputs the generated current value data Da to the processing unit 15. do. In addition, the processing unit 15 determines the voltage value specified based on the voltage value data frame Fcv (the “voltage value” of the “first voltage” applied to the power line L6) and the current value data Da. The specified current value (“current value” flowing through the power line L6) is displayed on the display unit 13 . Further, based on the specified voltage value and current value, the processing unit 15 controls the electric power supplied from the voltage control unit 104 of the electric vehicle 100 to the air conditioner control unit 108 via the power line L6 ( power consumption) is calculated, and the calculated power value is displayed on the display unit 13 .

Further, the processing unit 15 generates a power value data frame Fcp that can identify the calculated power value, and causes the signal output unit 14 to output the generated power value data frame Fcp to the serial bus SB2. As a result, the power value data Dp indicating the power value specified based on the power value data frame Fcp output from the power calculation device 1A is output to the recording device 2 in the same manner as in the series of processing by the power measurement system 10 described above. is recorded on the recording medium 21, and the power value data frame Fcp is output to the serial bus SB1 via the repeater 3.

Thus, in the power measurement system 10A and its power calculation method, the voltage value data frame Fcv (CAN frame Fc) capable of specifying the "voltage value" of the "first voltage" applied to the power line L6 is read from the serial bus SB1 for CAN communication, the "current value" of the current flowing through the power line L6 is measured, and the "voltage value" specified based on the voltage value data frame Fcv and the measured "current value” of the power supplied via the power line L6 (in this example, the power supplied from the voltage control unit 104 to the air conditioner control unit 108 as the air conditioner 109 operates) based on the “power value " is calculated.

Therefore, according to the power measurement system 10A and the power calculation method, the "voltage value" specified based on the voltage value data frame Fcv read from the serial bus SB1 and the "current value" measured by the current measurement unit 17 Based on this, the "voltage value" of the "first voltage" applied to the power supply conductor of the power line L6 is measured by calculating the "power value" of the power supplied via the power line L6. The "power value" can be calculated at a low cost by eliminating the need for a measuring device.

Further, according to the power measurement system 10A and the power calculation method thereof, the non-contact current sensor 17a capable of measuring the "current value" without contact with respect to the power supply conductor of the power line L6 is used to " By measuring the "current value", it is possible to measure the "current value" of the current flowing through the power supply conductor without removing the insulating coating covering the power supply conductor of the power line L6. It is possible to suitably avoid a state where the insulation of the power supply conductor is lowered due to the calculation of the value, and to calculate the "power value" in a state similar to the operating state during actual use of the electric vehicle 100. can be specified.

Next, still other embodiments of the "power computing device" and the "power computing method" will be described with reference to the accompanying drawings. Components similar to those of the power measurement systems 10 and 10A described above are denoted by the same reference numerals, and overlapping descriptions are omitted.

The power measurement system 10B shown in FIG. 6 is still another example of the "power calculation device" configured to be able to calculate the power value according to the "power calculation method". and a power calculation device 1B in place of the power calculation device 1A in the power measurement system 10A, a recording device 2, a repeater 3 (none of which are shown), and a serial bus SB2. Further, the power calculation device 1B is a device that can be attached to and detached from the power calculation target equipment such as the electric vehicle 100 like the power calculation device 1, and includes a voltage detection unit 11, an operation unit 12, a display unit 13, and a signal output unit. It includes a unit 14 , a processing unit 15 , a storage unit 16 , and a voltage measurement unit 18 .

The voltage measurement unit 18 corresponds to a "voltage measurement unit" and includes a clamp-type non-contact voltage sensor 18a, which is an example of a "non-contact voltage sensor." The voltage measurement unit 18 measures the voltage value (“ An example of the “voltage value” of the first voltage” is measured in a non-contact manner with respect to the supply conductor via the non-contact voltage sensor 18a, and the voltage value data Dv (“voltage value data” indicating the measurement result) is measured in a non-contact manner. example) is output to the processing unit 15 .

When computing (measuring), displaying, and recording the power value by the power measurement system 10B, as shown in FIG. The signal line of the serial bus SB1 is clamped by the non-contact voltage sensor 11a), and the non-contact voltage sensor 31a in the voltage detection unit 31 of the repeater 3 connected to the serial bus SB1 is clamped by the serial bus of the power measurement system 10B. SB2 (the signal line of the serial bus SB2 is clamped by the non-contact voltage sensor 31a), and further, the non-contact voltage sensor 18a is mounted on the power line L6 of the electric vehicle 100 (the power line L6 is clamped by voltage sensor 18a). At this time, by attaching the non-contact voltage sensor 18a to the power line L6, the supply conductor of the power line L6 and the electrode of the non-contact voltage sensor 18a are in close proximity to each other via the insulating coating of the electric wire, and the supply The conductor and the electrode are capacitively coupled.

Next, in a state where power is being supplied from the voltage control unit 104 to the air conditioner control unit 108 via the power line L6, the operation unit 12 of the power calculation device 1B is operated to instruct the start of processing. At this time, the processing unit 15 first starts reading the CAN frame Fc (current value data frame Fca, etc.) transmitted via the serial bus SB1. Since the identification of the CAN frame Fc by the voltage detection unit 11 is the same as the above-described processing in the power arithmetic units 1 and 1A, detailed description thereof will be omitted. As a result, the current value data frame Fca that can specify the "current value" of the current flowing through the supply conductor of the power line L6 is specified.

In parallel with reading the current value data frame Fca, the processing unit 15 controls the voltage measurement unit 18 to start measuring the “voltage value”. In response to this, the voltage measurement unit 18 measures the voltage value of the voltage applied to the supply conductor of the power line L6 to generate voltage value data Dv, and transmits the generated voltage value data Dv to the processing unit 15. Output. The measurement of the "voltage value" by the voltage measurement unit 18 via the non-contact voltage sensor 18a is similar to the measurement of the "voltage value" by the voltage detection unit 11 via the non-contact voltage sensor 11a. For the sake of principle, detailed description is omitted.

In addition, the processing unit 15 determines the voltage value specified based on the voltage value data Dv (“voltage value” of the “first voltage” applied to the power line L6), and based on the current value data frame Fca The specified current value (“current value” flowing through the power line L6) is displayed on the display unit 13 . Further, based on the specified voltage value and current value, the processing unit 15 controls the electric power supplied from the voltage control unit 104 of the electric vehicle 100 to the air conditioner control unit 108 via the power line L6 ( power consumption) is calculated, and the calculated power value is displayed on the display unit 13 .

Further, the processing unit 15 generates a power value data frame Fcp that can identify the calculated power value, and causes the signal output unit 14 to output the generated power value data frame Fcp to the serial bus SB2. As a result, the power value data Dp indicating the power value specified based on the power value data frame Fcp output from the power calculation device 1B is recorded in the same manner as the above-described series of processing by the power measurement systems 10 and 10A. The power value data frame Fcp is recorded on the recording medium 21 of the device 2 and output to the serial bus SB1 via the repeater 3 .

Thus, in the power measurement system 10B and its power calculation method, the current value data frame Fca (CAN frame Fc) capable of specifying the "current value" of the current flowing through the power line L6 is serially transmitted for CAN communication. While reading from the bus SB1, the "voltage value" of the "first voltage" applied to the power line L6 is measured, and the "current value" specified based on the measured "voltage value" and the current value data frame Fca value” of the power supplied via the power line L6 (in this example, the power supplied from the voltage control unit 104 to the air conditioner control unit 108 as the air conditioner 109 operates) based on the “power value " is calculated.

Therefore, according to the power measurement system 10B and the power calculation method, the "voltage value" measured by the voltage measurement unit 18 and the "current value" specified based on the current value data frame Fca read from the serial bus SB1 A measuring device for measuring the "current value" of the current flowing through the power supply conductor of the power line L6 by calculating the "power value" of the power supplied through the power line L6 based on is unnecessary, the "power value" can be calculated at low cost.

Further, according to the power measurement system 10B and its power calculation method, the non-contact voltage sensor 18a capable of measuring the "voltage value" without contact with respect to the power supply conductor of the power line L6 is used to " By measuring the "voltage value", the "voltage value" of the "first voltage" applied to the power supply conductor is measured without removing the insulating coating covering the power supply conductor of the power line L6. Therefore, it is possible to suitably avoid a state in which the insulation of the power supply conductor is lowered due to the calculation of the power value, and a state similar to the operating state when the electric vehicle 100 is actually used. can specify the "power value".

The configuration of the "power computing device" and the procedure of the "power computing method" are not limited to the examples of the configuration of the power measurement systems 10, 10A, and 10B and the procedure of the "power computing method". For example, when reading the CAN frame Fc from the serial bus SB1 of the electric vehicle 100 via the non-contact voltage sensor 11a, the voltage of the frame transmission conductor of the signal line corresponding to "CANH" and the voltage corresponding to "CANL" The voltage detector 11 detects the voltages of the frame transmission conductors of the signal line, and the processing unit 15 detects the voltage difference between the two frame transmission conductors. Although the example of the configuration and method for identifying the content of the CAN frame Fc has been described, the following configuration can also be adopted.

Specifically, when reading the CAN frame Fc transmitted by the "two-wire differential voltage method", instead of the voltage detection unit 11 in the power arithmetic units 1, 1A, and 1B of the above example, the voltage detector shown in FIG. By providing the voltage detection unit 50 and configuring the “power calculation device”, it becomes possible for the processing unit 15 to accurately and easily read the CAN frame Fc (specify the content). The voltage detection section 50 includes amplifiers 51h and 51l, a difference circuit (eg, a transformer) 52, an amplifier 53, and an A/D converter 54, as shown in FIG.

When reading the CAN frame Fc from the serial bus SB1 by the power arithmetic devices 1, 1A, and 1B having the voltage detection unit 50 instead of the voltage detection unit 11, the signal line corresponding to "CANH" and A non-contact voltage sensor 11a is attached to each signal line corresponding to "CANL". In this state, when the CAN frame Fc is transmitted to the serial bus SB1, the frame transmission conductor of the signal line corresponding to "CANH" (hereinafter also referred to as "CANH transmission conductor") and the non-contact voltage sensor Via the capacitive coupling with the detection electrode 11a, the voltage corresponding to the current flowing according to the potential of the transmission conductor of "CANH" is amplified by the amplifier 51h, and the signal line corresponding to "CANL" is amplified. Through the capacitive coupling between the frame transmission conductor (hereinafter also referred to as "CANL transmission conductor") and the detection electrode of the non-contact voltage sensor 11a, the potential of the "CANL" transmission conductor A voltage corresponding to the current flowing in response to is amplified by the amplifier 51l.

Also, a voltage corresponding to the difference between the output voltage from the amplifier 51h and the output voltage from the amplifier 51l is output from the difference circuit 52. This output voltage is amplified by the amplifier 53 and A/D converted by the A/D converter 54. and output to the processing unit 15 as voltage value data. On the other hand, when the value of the voltage value data output from the A/D converter 54 is equal to or higher than a predetermined voltage value level, the processing unit 15 determines that the digital signal "0" is being transmitted. Further, the processing unit 15 determines that the digital signal "1" is being transmitted when the value of the voltage value data output from the A/D converter 54 is below a predetermined voltage value level. do. As a result, the contents of the CAN frame Fc transmitted over the serial bus SB1 are specified in the same manner as when reading the CAN frame Fc in the power arithmetic devices 1, 1A, and 1B having the voltage detection unit 11 described above.

Further, when reading the CAN frame Fc from the serial bus SB1 of the electric vehicle 100, the "second voltage" is detected through the non-contact voltage sensor 11a without contacting the conductor for frame transmission, and the "voltage Although the example of the power measurement system 10, 10A, 10B having a "reader" that identifies the CAN frame Fc based on changes in "level" has been described, direct contact (direct connection) to the frame transmission conductors of the serial bus SB1 has been described. ), a “reading unit” for reading the CAN frame Fc from the serial bus SB1 via the signal line (not shown).

In addition, when measuring the "current value" of the current flowing through the power line L6 of the electric vehicle 100, the current for measuring the "current value" is measured via the non-contact current sensor 17a in a non-contact manner with respect to the power supply conductor. Although the example of the power measurement system 10A having the measurement unit 17 has been described, the "power calculation device ” can also be constructed (not shown). Furthermore, when measuring the "voltage value" of the "first voltage" applied to the power line L6 of the electric vehicle 100, the "voltage Although the example of the power measurement system 10B having the voltage measurement unit 18 that measures the "value" has been described, the "voltage measurement unit" that directly contacts the power supply conductor of the power line L6 to measure the "voltage value" is used. A "power calculator" may also be provided (not shown).

Further, examples of the power measurement systems 10, 10A, and 10B provided with the recording device 2 for recording the power value data Dp capable of specifying the calculated "power value" have been described, but the configuration for recording the "power value data" is Since it is not an essential component of the "power computing device", it is also possible to employ a configuration in which "power value data" is not recorded. Furthermore, the power measurement systems 10, 10A, and 10B configured to output the power value data frame Fcp that can specify the calculated "power value" from the repeater 3 to the serial bus SB1 have been described as an example. is not an essential component of the "power computing device", a configuration that does not output the "power value data frame" can also be adopted.

Also, the battery control unit 103, the voltage control unit 104, the inverter unit 106, the air conditioner control unit 108, the main control unit 110, and the like are targeted for the power line L6 of the electric vehicle 100, which is connected to one serial bus SB1. Although the example of calculating the "value" has been described, in some devices or systems in which the "power line" for which the "power value" is to be calculated is arranged, the "CAN frame" is relayed via a "repeater". Some have multiple "serial buses".

As an example, an electric vehicle 100A shown in FIG. 8 has a plurality of (in this example, two) serial buses SB1m and SB1s connected via a repeater 130 instead of the serial bus SB1 in the electric vehicle 100 described above. It is configured in the same manner as the electric vehicle 100 except that it is provided. Components of the electric vehicle 100A having the same functions as those of the electric vehicle 100 and components of the power measurement systems 10, 10A, and 10B are denoted by the same reference numerals, and overlapping descriptions are omitted. Also, in the figure, illustration of the power lines L3, L6, L7, the auxiliary battery 102, the air conditioner controller 108, and the air conditioner 109 is omitted.

The repeater 130 is an example of a "repeater", and together with the serial buses SB1m and SB1s, constitutes a CAN frame FC transmission path (communication network) in the electric vehicle 100A. Specifically, the relay 130 relays various CAN frames Fc between the serial buses SB1m and SB1s (between the device connected to the serial bus SB1m and the device connected to the serial bus SB1s). Further, the serial buses SB1m and SB1s correspond to "a plurality of serial buses in which CAN frames are relayed via repeaters". can be transmitted.

In this case, in this electric vehicle 100A, the inverter unit 106 DC/AC-converts the electric power supplied from the voltage control unit 104 via the power line L4 and transmits the power to the motor 107 in the same manner as in the electric vehicle 100 described above. By doing so, the motor 107 is rotated, thereby rotating the driving wheels of the electric vehicle 100A. Therefore, based on the voltage value of the voltage applied to power line L4 and the current value of the current flowing through power line L4, the amount of power consumed by running electric vehicle 100A (hereinafter also referred to as "power consumption during running") is reduced. A "power value" can be specified.

In the electric vehicle 100A, the voltage control unit 104 (“CAN frame output 1) and the main control unit 110 are connected to the serial bus SB1m, and devices that complement the main devices are connected to the serial bus SB1s. Further, in the electric vehicle 100A of this example, as an example, the repeater 130 relays a predetermined CAN frame Fc among various CAN frames Fc transmitted via the serial bus SB1m to the serial bus SB1s, A configuration is adopted in which a predetermined CAN frame Fc among various CAN frames Fc transmitted via the serial bus SB1s is relayed to the serial bus SB1m.

Furthermore, in the electric vehicle 100A of this example, as an example, a connector 140 (Data Link Connector) for connecting a diagnostic device for diagnosing the state of various parts of the electric vehicle 100A during maintenance work of the electric vehicle 100A is a serial bus. SB1s, various CAN frames Fc transmitted via the serial bus SB1s are read by the device connected to the connector 140 for connection, and various kinds of CAN frames Fc are read from the device connected to the connector 140 to the serial bus SB1s. It is possible to output a CAN frame Fc. In this example, illustration and description of nodes connected to the serial bus SB1s are omitted.

On the other hand, when calculating the "power value" of the power consumption during running by the above-described power measurement systems 10, 10A, and 10B for the electric vehicle 100A as described above, the "power value" of the two serial buses SB1m, SB1s A non-contact voltage sensor 11a is attached to a serial bus SB1m, which is an example of a serial bus connected to a CAN frame output device that outputs a CAN frame necessary for value calculation, and a voltage value data frame Fcv and current value data are obtained. It is preferable to read the frame Fca etc. from the serial bus SB1m.

Specifically, in the electric vehicle 100A for which the "power value" is to be calculated, as described above, some of the various CAN frames Fc transmitted via the serial bus SB1m are transmitted by the repeater 130 to the serial bus SB1s. , and transmitted via the serial bus SB1s. However, such as the voltage value data frame Fcv and the current value data frame Fca that are output from the voltage control unit 104 to the serial bus SB1m, the CAN frame Fc that is frequently output, and the electric vehicle 100A when deterioration or tampering occurs. As for the CAN frame Fc, which may compromise safety, it is normally configured such that it is not relayed from the serial bus SB1m to the serial bus SB1s. A configuration in which the data is transmitted to the bus SB1s is adopted. Therefore, it is difficult for the power measurement systems 10, 10A, and 10B to accurately calculate the "power value" using only the CAN frame Fc that can be read from the serial bus SB1m.

Also, among the CAN frames Fc not relayed from the serial bus SB1m to the serial bus SB1s, the CAN frames Fc necessary for calculating the "power value" of the power consumption during running are relayed from the serial bus SB1m to the serial bus SB1s. By transmitting a control command to the relay 130 to relay all the necessary CAN frames Fc, there is a possibility that the "power value" can be calculated based on the CAN frames Fc read from the serial bus SB1s. However, due to the time required for relaying the CAN frame Fc by the repeater 130, the acquisition of the CAN frame Fc necessary for the calculation of the "power value" may be delayed, or the CAN frame Fc may be relayed from the serial bus SB1m to the serial bus SB1s. As the number of CAN frames Fc increases, the transmission of the CAN frames Fc that should normally be transmitted via the serial bus SB1s may be hindered.

Therefore, the voltage control unit 104 that outputs the CAN frame Fc necessary for calculating the "power value" of the power consumption during running of the plurality of serial buses SB1m and SB1s to which the CAN frame Fc is relayed via the repeater 130 is By reading the CAN frame Fc necessary for calculating the "power value" from the connected serial bus SB1m, the "power value" can be calculated without outputting a control command instructing relaying of the CAN frame Fc to the repeater 130. can read the CAN frame Fc necessary for the serial bus SB1s and avoid relaying a large amount of CAN frames Fc necessary for the calculation of the "power value" from the serial bus SB1m to the serial bus SB1s. The "power value" can be calculated without disturbing the transmission of the CAN frame Fc in .

Note that the procedure for calculating the "power value" of the power consumption during running based on the voltage value of the voltage applied to the power line L4 and the current value of the current flowing through the power line L4 is described in the power consumption of the electric vehicle 100 described above. Based on the voltage value of the voltage applied to the line L6 and the current value of the current flowing through the power line L6, the power consumed by the operation of the air conditioner 109 (from the voltage control unit 104 to the air conditioner through the power line L6) Since the procedure is the same as the procedure for calculating the power value of the power supplied to the device control unit 108, detailed description thereof will be omitted.

In this case, when the "power value" of the power consumption during running is calculated by the power calculation device 1A of the power measurement system 10A, the non-contact current sensor 17a is attached to the power line L4, The current value of the current flowing through the conductor is measured without contact with the supply conductor. Further, when calculating the "power value" of the power consumption during running by the power measurement system 10B (power calculation device 1B), the non-contact voltage sensor 18a is attached to the power line L4, The voltage value of the voltage applied to the conductor (the voltage value of the first voltage) is measured without contact with the supply conductor.

On the other hand, an example of calculating the "power value" for the electric vehicle 100A to which the serial buses SB1m and SB1s capable of transmitting various CAN frames Fc according to the same CAN protocol are connected by the repeater 130 has been described. Among the objects to be calculated of "value", there are a plurality of serial buses that are capable of transmitting various CAN frames according to mutually different CAN protocols. In some cases, when relaying, it is necessary to perform protocol conversion in a “relay device (gateway)”.

Under such an environment, serial buses other than the serial bus to which the CAN frame output device is connected (a serial bus in which CAN frames are transmitted with a CAN protocol different from the CAN protocol of the serial bus to which the CAN frame output device is connected) ), it takes a long time to convert the protocol in the repeater, so it is difficult to specify the voltage and current values required for the calculation in real time. may become Moreover, when the processing capability of the "relay device (gateway)" is low, it becomes difficult to relay (protocol conversion) all the CAN frames necessary for the calculation of the "power value". Therefore, it is preferable to read the necessary CAN frames from the serial bus to which the "CAN frame output device" is connected, as in the above example.

Further, when the connector 140 for connection is disposed on the serial bus SB1s as in the electric vehicle 100A of this embodiment, the connector 140 for connection is used instead of the non-contact voltage sensor 11a in the power measurement systems 10, 10A, and 10B. Connectable connection connectors (not shown) are connected to the power arithmetic units 1, 1A, and 1B, and the serial bus is connected via a signal line that is in direct contact (direct connection) with the frame transmission conductor of the serial bus SB1b. It is also possible to read the CAN frame Fc from SB1s.

However, when it is not possible to relay all of the CAN frame Fc (the CAN frame Fc output from the voltage control unit 104) required for calculating the "power value" from the serial bus SB1m to the serial bus SB1s, the connector 140 The "power value" cannot be calculated with only the read CAN frame Fc. Therefore, it is necessary to read the CAN frame Fc necessary for calculating the "power value" from the serial bus SB1m. If not, the voltage signal corresponding to the CAN frame must be read from the frame transmission conductors by peeling off the insulating coating covering the frame transmission conductors in each signal line of the serial bus SB1m.

On the other hand, in the power measurement systems 10, 10A, and 10B, the CAN frame Fc can be read without contacting the frame transmission conductor via the non-contact voltage sensor 11a. Regardless of whether or not all the CAN frames Fc required for the calculation of the "power value" can be relayed to the serial bus SB1s, whether or not the connector 140 for connection is disposed on the serial bus SB1s, and whether or not All the CAN frames Fc necessary for the calculation of the "power value" can be reliably read without damaging the signal line.

In this case, for example, when developing a new model vehicle, it is preferable to calculate the "electric power value" in an environment similar to the state after shipment of the vehicle with respect to the noise immunity of the serial buses SB1m and SB1s. For this reason, as in the power measurement systems 10, 10A, and 10B described above, by making it possible to read the CAN frame Fc without contacting the frame transmission conductor via the non-contact voltage sensor 11a, the serial bus SB1m, It is preferable to be able to calculate the "power value" without damaging the insulating coating of the frame transmission conductor in the SB1s. In addition, when the insulation coating of the frame transmission conductor is removed for the calculation of the "power value" when inspecting the vehicle after shipment, the removed insulation coating is repaired after the calculation of the "power value" is completed. need to be done. For this reason, even when calculating the "electric power value" for a vehicle after shipment, as in the above power measurement systems 10, 10A, and 10B, the non-contact voltage sensor 11a is applied to the frame transmission conductor. Preferably, the CAN frame Fc can be read contactlessly.

Further, the "power value" of the power supplied from the voltage control unit 104 to the air conditioner control unit 108 via the power line L6, and the "power value" of the power supplied from the voltage control unit 104 to the inverter unit 106 via the power line L4. An example of calculating the "power value" of electric power has been described, but the "power value" calculated based on the "voltage value" and "current value" by the "power calculation device" and the "power calculation method" AC power is not limited to "power value", and if the transmission rate of "CAN frame" on "serial bus" is within a range that does not cause omission of acquisition of "voltage value data frame" or "current value data frame" can be calculated by the "power calculation device" and the "power calculation method". In this case, the inventor believes that in the current "CAN" standard, if the AC power is 100 Hz or less (according to the congestion state of the "CAN frame" in the "serial bus", the AC power is 10 Hz or less), the above power It has been confirmed that the "power value" can be suitably calculated by the configuration and method in the same manner as the measurement systems 10, 10A, and 10B.

Also, the electric power value of the electric power supplied via the "power lines (in this example, power lines L6 and L4)" of the electric vehicle 100, 100A is set to the serial bus SB1 of the electric vehicle 100 or the serial bus SB1m of the electric vehicle 100A. The CAN frame Fc (the voltage value data frame Fcv and/or the current value data frame Fca) read out from the CAN frame Fc (the voltage value data frame Fcv and/or the current value data frame Fca) has been described as an example. Any "power value" in (fields such as networks for factory equipment and networks in cultivated land) is calculated by the same configuration and method as the "power calculation method" by the above power measurement systems 10, 10A, 10B, etc. be able to.

In addition, the “voltage value data frame” and/or the “current value data frame” read from the “serial bus” are not limited to “CAN frames” such as CAN frame Fc, and can be “CAN FD”, “FlexRay (registered trademark)”. )” and “LIN”, and frames (digital data) conforming to various communication standards that enable small-amplitude, low-power-consumption communication by “LVDS”. ” can be employed.

According to the present invention, the power supplied via the power line is determined based on the voltage value and current value specified based on the CAN frame such as the voltage value data frame and the current value data frame read from the serial bus. A measuring device for measuring the voltage value of the voltage applied to the power supply conductor of the power line and the current value of the current flowing through the power supply conductor of the power line by calculating the power value of becomes unnecessary. Therefore, as a result of being able to calculate the power value at low cost, it can be widely applied to a power calculation device and a power calculation method for calculating the power value of the power supplied via the power line.

Reference Signs List 10, 10A, 10B Power measurement system 1, 1A, 1B Power arithmetic device 2 Recording device 3 Repeater 11, 31, 50 Voltage detection unit 11a, 31a Non-contact voltage sensor 12 Operation unit 13 Display unit 14, 32 Signal output unit 15, 23, 33 processing unit 16, 24, 34 storage unit 17 current measurement unit 17a non-contact current sensor 18 voltage measurement unit 18a non-contact voltage sensor 21 recording medium 22 data input/output unit 51h, 51l, 53 amplifier 52 difference Circuit 54 A/D converter 100, 100A Electric vehicle 104 Voltage control unit 108 Air conditioner control unit 109 Air conditioner 130 Repeater 140 Connector for connection Da Current value data Dp Power value data Dv Voltage value data Fc CAN frame Fca Current value data Frame Fcp Power value data frame Fcv Voltage value data frame L6 Power line SB1, SB1m, SB1s, SB2 Serial bus

Claims (14)

Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power computing device comprising a processing unit that computes the power value of power supplied via
A reading unit for reading a CAN frame transmitted via a serial bus for CAN communication from the serial bus,
The reading unit includes a non-contact voltage sensor capable of detecting a second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame without contacting the frame transmission conductor. a detection unit; and a frame identification unit that identifies the CAN frame transmitted via the serial bus based on a change in the voltage level of the second voltage detected by the voltage detection unit, wherein the voltage value read from the serial bus a voltage value data frame as the CAN frame capable of specifying the current value and a current value data frame as the CAN frame capable of specifying the current value, and output to the processing unit;
The processing unit is a power calculation device configured to calculate the power value based on the voltage value specified based on the voltage value data frame and the current value specified based on the current value data frame. Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power computing device comprising a processing unit that computes the power value of power supplied via
a reading unit for reading a CAN frame transmitted via a serial bus for CAN communication from the serial bus;
A current measuring unit that measures the current value and outputs current value data,
The reading unit includes a non-contact voltage sensor capable of detecting a second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame without contacting the frame transmission conductor. a detection unit; and a frame identification unit that identifies the CAN frame transmitted via the serial bus based on a change in the voltage level of the second voltage detected by the voltage detection unit, wherein the voltage value reading from the serial bus a voltage value data frame as the CAN frame that can specify the voltage value data frame and outputting it to the processing unit;
The processing unit is a power calculation device configured to calculate the power value based on the voltage value specified based on the voltage value data frame and the current value specified based on the current value data. 3. The power arithmetic unit according to claim 2, wherein the current measuring unit includes a non-contact current sensor capable of measuring the current value without contacting the power supply conductor of the power line. Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power computing device comprising a processing unit that computes the power value of power supplied via
a reading unit for reading a CAN frame transmitted via a serial bus for CAN communication from the serial bus;
A voltage measuring unit that measures the voltage value and outputs voltage value data,
The reading unit reads a current value data frame as the CAN frame capable of specifying the current value from the serial bus and outputs the current value data frame to the processing unit,
The processing unit is a power calculation device configured to calculate the power value based on the voltage value specified based on the voltage value data and the current value specified based on the current value data frame. 5. The power arithmetic unit according to claim 4, wherein the voltage measurement unit includes a non-contact voltage sensor capable of measuring the voltage value without contacting the power supply conductor of the power line. The reading unit is connected to a CAN frame output device for outputting the CAN frame required for the calculation of the power value by the processing unit among the plurality of serial buses to which the CAN frame is relayed via a repeater. 6. The power calculation device according to claim 1, wherein the CAN frame necessary for calculation of the power value is read from the serial bus. The reading unit includes a non-contact voltage sensor capable of detecting a second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame without contacting the frame transmission conductor. and a frame identification section that identifies the CAN frame transmitted via the serial bus based on a change in the voltage level of the second voltage detected by the voltage detection section. 7. The power computing device according to any one of 4 to 6. 8. The CAN frame output unit according to any one of claims 1 to 7, further comprising a CAN frame output unit that generates a power value data frame as the CAN frame capable of specifying the power value calculated by the processing unit and outputs the generated power value data frame to the serial bus. power computing unit. Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power calculation method for calculating a power value of power supplied via
a voltage value data frame capable of specifying the voltage value and a current value data frame capable of specifying the current value of the CAN frame transmitted via a serial bus for CAN communication; When computing the power values based on the voltage values identified based on the voltage value data frame and the current values identified based on the current value data frames, respectively reading from the bus, the CAN The second voltage applied to the frame transmission conductor of the serial bus during frame transmission is detected by using a non-contact voltage sensor capable of detecting the second voltage without contact with the frame transmission conductor. A power calculation method for detecting and identifying the CAN frame transmitted over the serial bus based on the detected change in voltage level of the second voltage. Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power calculation method for calculating a power value of power supplied via
A voltage value data frame capable of specifying the voltage value among CAN frames transmitted via a serial bus for CAN communication is read from the serial bus, and the current value is measured, based on the voltage value data frame. and the measured current value, the second voltage applied to the frame transmission conductor of the serial bus during the transmission of the CAN frame is applied to the detecting the second voltage using a non-contact voltage sensor capable of detecting the frame transmission conductor without contact; A power calculation method for identifying the CAN frame transmitted via . Periodically specifying a voltage value of a first voltage applied to a power line and a current value of a current flowing through the power line, and based on the specified voltage value and current value, the power line A power calculation method for calculating a power value of power supplied via
measuring the voltage value, reading from the serial bus a current value data frame capable of specifying the current value among CAN frames transmitted via a serial bus for CAN communication, and measuring the voltage value; A power calculation method for calculating the power value based on the current value specified based on the current value data frame. of the plurality of serial buses to which the CAN frame is relayed via a repeater, to which a CAN frame output device for outputting the CAN frame required for calculating the power value is connected. 12. The power calculation method according to any one of claims 9 to 11, wherein CAN frames required for calculation are read. The second voltage applied to the frame transmission conductor of the serial bus during transmission of the CAN frame is detected by using a non-contact voltage sensor that can detect the frame transmission conductor in a non-contact manner. 13. The power calculation method according to claim 11 or 12, wherein a voltage is detected and the CAN frame transmitted via the serial bus is identified based on the detected voltage level change of the second voltage. 14. The power calculation method according to any one of claims 9 to 13, wherein a power value data frame is generated as said CAN frame capable of specifying said calculated power value and output to said serial bus.

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