JP2020048148A - AD converter and self-diagnosis method - Google Patents

Abstract

To determine that an AD converter is abnormal even when it is determined that pieces of digital data do not match only in certain types of self-diagnosis data when multiple types of pieces of self-diagnosis data are input to an AD converter.SOLUTION: When a higher-level control unit 6 determines that digital data after AD conversion of self-diagnosis 1-bit pulse data Sv1 does not match digital data Dv1 continues for a threshold NG1-th or more, or determines that digital data after AD conversion of self-diagnosis 1-bit pulse data Sv2 does not match digital data Dv2 continues for a threshold NG2-th or more, it is determined that an AD converter 5 is abnormal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a self-diagnosis technology of an AD converter.

  As an AD converter, a plurality of types of self-diagnosis data are converted into digital data by an AD converter, and whether or not each of the AD-converted digital data matches predetermined digital data corresponding to each of the self-diagnosis data is determined. Are determined sequentially, and when two or more consecutive cases where the digital data do not match each other are determined, the AD converter may determine that the AD converter is abnormal.

  As a related technique, there is Patent Document 1 or Patent Document 2.

JP 2005-323273 A JP-A-08-0556160

  However, when it is determined that only one type of self-diagnosis data among a plurality of types of self-diagnosis data does not match each other, the A / D conversion apparatus performs the next type of self-diagnosis of the certain type of self-diagnosis data. In the data, it is determined that the digital data match each other, and the mismatch does not continue two or more times. Therefore, it is determined that the AD converter is not abnormal even though the AD converter is abnormal for a certain type of self-diagnosis data. There is a concern.

  An object according to one aspect of the present invention is to provide a case where a plurality of types of self-diagnosis data are input to an AD converter, even when it is determined that digital data does not match only in a certain type of self-diagnosis data. , AD converter is determined to be abnormal.

  An AD converter according to one aspect of the present invention includes a higher-level control unit that outputs first and second self-diagnosis commands and a first self-diagnosis data when a first self-diagnosis command is input. An A / D converter for performing A / D conversion and receiving an input of the second self-diagnosis command when the second self-diagnosis command is input, wherein the higher-level control unit outputs the first self-diagnosis command and outputs the first self-diagnosis command; If the digital data after the AD conversion of the self-diagnosis data matches the first digital data, a second self-diagnosis instruction is output, a second self-diagnosis instruction is output, and the AD of the second self-diagnosis data is output. If the converted digital data matches the second digital data, a first self-diagnosis command is output, a first self-diagnosis command is output, and the digital data of the first self-diagnosis data after AD conversion is If it does not match the first digital data, , The first self-diagnosis command is output, the second self-diagnosis command is output, and if the digital data after the AD conversion of the second self-diagnosis data does not match the second digital data, the second self-diagnosis command is output again. A self-diagnosis instruction is output, and if the digital data after AD conversion of the first self-diagnosis data does not match the first digital data continues for a first threshold or more, or the AD of the second self-diagnosis data If the fact that the converted digital data does not match the second digital data continues for a second threshold or more, it is determined that the AD converter is abnormal.

  This makes it possible to determine whether or not the AD converter is abnormal for each of a plurality of types of self-diagnosis data input to the A / D converter. Even when it is determined not to do so, it can be determined that the AD converter is abnormal.

  Further, an AD converter according to an aspect of the present invention includes a higher-level control unit that repeatedly outputs the first and second self-diagnosis instructions in order, and a first self-diagnosis instruction when the first self-diagnosis instruction is input. An A / D converter for performing A / D conversion of the self-diagnosis data and receiving an input of a second self-diagnosis command when the second self-diagnosis command is input; If the converted digital data does not match the first digital data continuously for a third threshold or more, or the AD converted digital data of the second self-diagnosis data does not match the second digital data. Is continuous for more than the fourth threshold value, it is determined that the AD converter is abnormal.

  Even with such a configuration, it is possible to determine whether or not the AD converter is abnormal for each of a plurality of types of self-diagnosis data input to the AD converter. Even when it is determined that the digital data do not match, it is possible to determine that the AD converter is abnormal.

  After determining that the AD converter is abnormal, the higher-level control unit continues that the digital data after the AD conversion of the first self-diagnosis data matches the first digital data is equal to or more than the fifth threshold value. In this case, if the digital data after the AD conversion of the second self-diagnosis data coincides with the second digital data for the sixth threshold or more, it is determined that the AD converter is normal.

  Thereby, the upper control unit can recognize that the abnormal AD converter has returned to normal.

  After determining that the AD converter is abnormal, the higher-level control unit determines that the digital data after AD conversion of the first self-diagnosis data matches the first digital data, and that the second self-diagnosis data If the total value of the coincidence of the digital data after AD conversion with the second digital data continues for a seventh threshold value or more, it is determined that the AD converter is normal.

  Thereby, the upper control unit can recognize that the abnormal AD converter has returned to normal.

  The digital data after the AD conversion of the first self-diagnosis data is obtained by inverting each bit of the bit string constituting the digital data after the AD conversion of the second self-diagnosis data.

  This makes it possible to easily set the digital data after the AD conversion of the first self-diagnosis data apart from the digital data after the AD conversion of the second self-diagnosis data.

  According to the present invention, when a plurality of types of self-diagnosis data are input to an AD converter, even if it is determined that digital data does not match only in a certain type of self-diagnosis data, the A / D converter Can be determined to be abnormal.

It is a figure showing the AD converter of an embodiment. 5 is a flowchart illustrating an operation of the AD converter. 9 is a flowchart illustrating an example of an operation of a higher-level control unit. 6 is a flowchart illustrating an operation of a higher-level control unit according to the first embodiment. 9 is a flowchart illustrating an operation of a higher-level control unit according to a modification of the first embodiment. 9 is a flowchart illustrating an operation of a higher-level control unit according to the second embodiment. 13 is a flowchart illustrating an operation of a higher-level control unit according to a modification of the second embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an AD converter according to an embodiment.

The AD converter 1 shown in FIG. 1 is provided in a battery pack Bp.
The battery pack Bp is mounted on the vehicle Ve.

  The vehicle Ve is a hybrid vehicle or an electric vehicle, and includes a load Lo such as a traveling motor in addition to the battery pack Bp.

  The battery pack Bp includes, in addition to the AD converter 1, a battery B that supplies power to the load Lo.

  The AD converter 1 includes a voltage measuring unit 2, a current measuring unit 3, a temperature measuring unit 4, an AD converter 5, an upper control unit 6, and a storage unit 13.

  The voltage measurement unit 2 is a voltmeter that measures the voltage of the battery B and outputs a measurement analog value Av that is the measurement result to the AD converter 5.

  The current measuring unit 3 is an ammeter that measures a current flowing through the battery B, and outputs a measured analog value Ai that is a result of the measurement to the AD converter 5.

  The temperature measuring unit 4 is a thermometer that measures the temperature of the battery B and outputs a measurement analog value At that is a measurement result to the AD converter 5.

  The AD converter 5 is configured by an IC (Integrated Circuit), and includes a multiplexer 7, a modulator 8, a self-diagnosis data output unit 9, a changeover switch 10, a digital filter 11, and a storage unit 12.

  The multiplexer 7 outputs any one of the measured analog value Av, the measured analog value Ai, and the measured analog value At to the modulator 8. When there is only one type of measured analog value, the multiplexer 7 may be omitted and the measured analog value may be directly output to the modulator 8.

  The modulator 8 converts the input measurement analog value Av into measurement 1-bit pulse data Sv. Further, the modulator 8 converts the input measurement analog value Ai into measurement 1-bit pulse data Si. Further, the modulator 8 converts the input measurement analog value At into measurement 1-bit pulse data St.

  The self-diagnosis data output unit 9 outputs self-diagnosis 1-bit pulse data Svn, Sin, and Stn as self-diagnosis data. Note that n indicates the number of types of the self-diagnosis 1-bit pulse data Sv, Si, and St. The number of types of each of the self-diagnosis 1-bit pulse data Sv, Si, and St is two or more. The plurality of types of self-diagnosis 1-bit pulse data Sv are different from each other, the plurality of types of self-diagnosis 1-bit pulse data Si are also different from each other, and the plurality of types of self-diagnosis 1-bit pulse data St are also different from each other. Data.

  The measurement 1-bit pulse data Sv, Si, St and the self-diagnosis 1-bit pulse data Svn, Sin, Stn alternately include a high-level pulse having a constant pulse width and a low-level pulse having a variable pulse width. It is a pulse signal. As the measured analog value increases, the density of high-level pulses of the measured 1-bit pulse data Sv, Si, and St (the number of high-level pulses per unit time) increases. Also, when the measured analog value decreases, the density of the high-level pulses of the measurement 1-bit pulse data Sv, Si, St decreases.

  Further, it is assumed that the 1-bit pulse data Svn for self-diagnosis is set by an experiment or a simulation so as to be converted into predetermined digital data Dvn. For example, the self-diagnosis 1-bit pulse data Svn is output from the modulator 8 via the voltage measuring unit 2 and the multiplexer 7 when the voltage of the battery B is overdischarge voltage <voltage of the battery B <overcharge voltage. The same data as the measured 1-bit pulse data Sv is used.

  Also, it is assumed that the 1-bit pulse data Sin for self-diagnosis is set by an experiment or a simulation so as to be converted into predetermined digital data Din. The 1-bit pulse data Sin for self-diagnosis is, for example, the measured 1-bit pulse data Si output from the modulator 8 via the current measuring unit 3 and the multiplexer 7 when the current flowing through the battery B is smaller than the overcurrent threshold. The same data as

  Also, it is assumed that the 1-bit pulse data for self-diagnosis Stn is set by an experiment or a simulation so as to be converted into predetermined digital data Dtn. The 1-bit pulse data Stn for self-diagnosis is, for example, the measured 1-bit pulse data St output from the modulator 8 via the temperature measuring unit 4 and the multiplexer 7 when the temperature of the battery B is smaller than the over-temperature threshold. Same data.

  Note that the self-diagnosis 1-bit pulse data may be simply referred to as self-diagnosis 1-bit pulse data without distinguishing the self-diagnosis 1-bit pulse data Svn, Sin, and Stn. Similarly, the measurement 1-bit pulse data Sv, Si, and St may be simply referred to as measurement 1-bit pulse data without distinction.

  Further, the measurement 1-bit pulse data Sv, Si, St and the self-diagnosis 1-bit pulse data Svn, Sin, Stn may be digital bit streams which are binary data strings. In this case, the values of the measured 1-bit pulse data Sv, Si, St represented by a binary number change according to the measured analog value.

  The changeover switch 10 outputs one of the measured 1-bit pulse data Sv, Si, and St output from the modulator 8 or the self-diagnosis 1-bit pulse data Svn, Sin, output from the self-diagnosis data output unit 9. Any one of Stn is output.

  The digital filter 11 converts the measured 1-bit pulse data Sv, Si, St and the self-diagnosis 1-bit pulse data Svn, Sin, Stn output from the changeover switch 10 into digital data of a predetermined number of bits and stores the converted data in the storage unit 12. Output.

  The storage unit 12 stores the input digital data in a corresponding storage area. In addition, the storage unit 12 may be provided outside the AD converter 5 and inside the AD conversion device 1.

  For example, when digital data converted from the self-diagnosis 1-bit pulse data Svn is input, the storage unit 12 stores the digital data in a voltage storage area, and then performs a voltage AD conversion process to perform measurement. When digital data converted from the analog value Av (or the measured 1-bit pulse data Sv) is input, the digital data is stored in the voltage storage area.

  When digital data converted from the 1-bit pulse data Sin for self-diagnosis is input, the storage unit 12 stores the digital data in a current storage area, and then performs a current AD conversion process, and performs measurement. When digital data converted from the analog value Ai (or the measured 1-bit pulse data Si) is input, the digital data is stored in the current storage area.

  When digital data converted from the self-diagnosis 1-bit pulse data Stn is input, the storage unit 12 stores the digital data in a temperature storage area, and then performs a temperature A / D conversion process and performs measurement. When digital data converted from the analog value At (or the measured 1-bit pulse data St) is input, the digital data is stored in the temperature storage area.

  The upper control unit 6 is constituted by, for example, a CPU (Central Processing Unit), a multi-core CPU, or a programmable device (FPGA (Field Programmable Gate Array) or PLD (Programmable Logic Device)), and executes a self-diagnosis instruction or an AD conversion instruction. Output to the AD converter 5.

The storage unit 13 may be provided outside the upper control unit 6 or may be provided inside.
Note that the AD converter 1 may be composed of a plurality of different units. For example, the upper control unit 6 may be provided in the control unit, and the part of the AD converter 1 other than the upper control unit 6 may be provided in the monitoring unit. In this case, the AD converter 1 may be configured with one monitoring unit and one control unit, or a plurality of monitoring units that monitor a plurality of batteries B and one control unit that controls the plurality of monitoring units. May be configured.

FIG. 2 is a flowchart showing the operation of the AD converter 5.
First, in steps S201 and S202, the AD converter 5 repeatedly determines whether a self-diagnosis command or an AD conversion command has been input.

  Next, when determining that the self-diagnosis command is input (Step S201: Yes), the AD converter 5 performs a self-diagnosis process (Step S203).

  When the AD converter 5 determines that the AD conversion command has been input (step S202: Yes), the AD converter 5 performs the AD conversion process (step S204).

  As an example, when the voltage self-diagnosis command Cv1 is input, the AD converter 5 executes the voltage self-diagnosis processing Pv1. First, when the AD converter 5 starts the voltage self-diagnosis process Pv1, the operation of the self-diagnosis data output unit 9 is controlled to output the self-diagnosis 1-bit pulse data Sv1 from the self-diagnosis data output unit 9. . Next, the AD converter 5 controls the operation of the changeover switch 10 to cause the digital filter 11 to output the self-diagnosis 1-bit pulse data Sv1 output from the self-diagnosis data output unit 9. Next, the AD converter 5 controls the operation of the digital filter 11 to convert the self-diagnosis 1-bit pulse data Sv1 output from the changeover switch 10 into digital data. The AD converter 5 controls the operation of the storage unit 12 to store the digital data converted by the digital filter 11 in the voltage storage area and sends the digital data to the higher-level control unit 6. The self-diagnosis process ends.

  Alternatively, when the voltage self-diagnosis command Cv2 is input, the AD converter 5 performs the voltage self-diagnosis processing Pv2. First, when the AD converter 5 starts the voltage self-diagnosis process Pv2, the operation of the self-diagnosis data output unit 9 is controlled so that the self-diagnosis data output unit 9 outputs the self-diagnosis 1-bit pulse data Sv2. . Next, the AD converter 5 controls the operation of the changeover switch 10 to cause the digital filter 11 to output the self-diagnosis 1-bit pulse data Sv2 output from the self-diagnosis data output unit 9. Next, the AD converter 5 controls the operation of the digital filter 11 to convert the self-diagnosis 1-bit pulse data Sv2 output from the changeover switch 10 into digital data. The AD converter 5 controls the operation of the storage unit 12 to store the digital data converted by the digital filter 11 in the voltage storage area and sends the digital data to the higher-level control unit 6. The self-diagnosis process ends.

  The 1-bit pulse data for self-diagnosis Sv2 (second self-diagnosis data) has a different value from the 1-bit pulse data for self-diagnosis Sv1 (first self-diagnosis data).

  The self-diagnosis processing for current and the self-diagnosis processing for temperature are also performed for each type of 1-bit pulse data for self-diagnosis.

  After receiving the digital data transmission command from the higher-level control unit 6, the AD converter 5 transmits the digital data stored in the voltage storage area, the current storage area, or the temperature storage area to the higher-level control unit 6. You may send it.

FIG. 3 is a flowchart illustrating an example of the operation of the higher-level control unit 6.
After performing the self-diagnosis processing (output of the self-diagnosis instruction and the normal / abnormal judgment of the AD converter 5) in step S301, the higher-level control unit 6 performs a series of processing (step S301, step S302) to output the AD conversion instruction in step S302. S302) is repeatedly performed. For example, the higher-level control unit 6 sequentially repeats a series of processes of a voltage self-diagnosis process, a voltage AD conversion command output, a current self-diagnosis process, a current AD conversion command output, a temperature self-diagnosis process, and a temperature AD conversion command output. carry out.

The self-diagnosis processing in step S301 will be described later with reference to FIGS.
Further, the order of the voltage AD conversion processing, the current AD conversion processing, and the temperature AD conversion processing is not particularly limited.

  The upper control unit 6 outputs three types of A / D conversion commands of voltage, current and temperature, but may output one or two types of A / D conversion commands among voltage, current and temperature. Alternatively, four or more types of AD conversion instructions may be output. When there are a plurality of types of AD conversion processes, each of the plurality of AD conversion processes is a different process.

  Further, the AD converter 5 and the upper control unit 6 repeatedly perform the self-diagnosis processing (output of the self-diagnosis instruction and the normal / abnormal judgment of the AD converter 5) and the AD conversion processing (output of the AD conversion instruction) in order. However, performing one or more AD conversion processes after a plurality of self-diagnosis processes may be repeated, or performing a plurality of AD conversion processes after one self-diagnosis process may be repeated.

  Here, the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv1 of the self-diagnosis 1-bit pulse data Sv1 and Sv2 does not match the digital data Dv1, and It is assumed that the digital data after Sv2 AD conversion matches the digital data Dv2, and that when the digital data does not match two or more consecutive times, the AD converter 5 is determined to be abnormal.

  In such a case, after the digital data do not match in the self-diagnosis 1-bit pulse data Sv1, the digital data in the self-diagnosis 1-bit pulse data Sv2 match and the digital data do not match. Since the continuation is not continuous, it is determined that the AD converter 5 is not abnormal even though the AD converter 5 is abnormal with respect to the self-diagnosis 1-bit pulse data Sv1.

  Therefore, the higher-level control unit 6 of the present embodiment suppresses the determination that the AD converter 5 is not abnormal even though the AD converter 5 is abnormal with respect to the self-diagnosis 1-bit pulse data Sv1. Therefore, for each type of the self-diagnosis 1-bit pulse data Svn (self-diagnosis 1-bit pulse data Sv1 and Sv2), the counter value NGn for counting the number of times the digital data did not match each other is used for AD. It is determined whether converter 5 is abnormal. Embodiments 1 and 2 described below show variations of a method for determining an abnormality of the AD converter 5 using the counter value NGn.

<Example 1>
FIG. 4 is a flowchart illustrating the operation of the upper control unit 6 when performing the voltage self-diagnosis processing according to the first embodiment. The operation of the higher-level control unit 6 when performing the current self-diagnosis processing and the temperature self-diagnosis processing in the first embodiment is the same as the operation of the higher-level control unit 6 when performing the voltage self-diagnosis processing in the first embodiment. The description is omitted here. As described above, n indicates the number of types of 1-bit pulse data Svn for self-diagnosis. When n is “1”, the voltage self-diagnosis instruction Cvn is replaced with the voltage self-diagnosis instruction Cv1 and the self-diagnosis 1 The bit pulse data Svn is the self-diagnosis 1-bit pulse data Sv1, the digital data Dvn is the digital data Dv1, the counter value OKn is the counter value OK1, the counter value NGn is the counter value NG1, the threshold value OKnth is the threshold value OK1th, and the threshold value is the threshold value OK1th. NGnth corresponds to the threshold value NG1th. When n is “2”, the voltage self-diagnosis command Cvn is the voltage self-diagnosis command Cv2, the self-diagnosis 1-bit pulse data Svn is the self-diagnosis 1-bit pulse data Sv2, and the digital data Dvn is the digital data Dvn. In the data Dv2, the counter value OKn corresponds to the counter value OK2, the counter value NGn corresponds to the counter value NG2, the threshold value OKnth corresponds to the threshold value OK2th, and the threshold value NGnth corresponds to the threshold value NG2th. The counter value OKn indicates the number of times that the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Svn coincides with the digital data Dvn, and the counter value NGn indicates the AD of the self-diagnosis 1-bit pulse data Svn. The number of times that the converted digital data and the digital data Dvn did not match each other is shown, and their initial values are set to “0”.

  First, the upper control unit 6 outputs the voltage self-diagnosis command Cvn to the AD converter 5 (step S401).

  Next, the higher-level control unit 6 determines that the digital data of the self-diagnosis 1-bit pulse data Svn after AD conversion does not match the digital data Dvn, that is, the self-diagnosis 1-bit pulse data Svn is correctly converted to the digital data Dn. If not converted (Step S402: No), the counter value NGn is incremented (+1) (Step S403), and the counter value OKn is set to zero (Step S404).

  Next, when the higher-level control unit 6 determines that at least one of the counter values NGn corresponding to all types of 1-bit pulse data for self-diagnosis Svn is not greater than or equal to the threshold value NGnth (step S405: No), the voltage self-diagnosis processing ends. Note that the threshold value NGnth is set to 2 or more. As described above, by setting the threshold value NGnth to 2 or more, it is included in the self-diagnosis 1-bit pulse data even though the AD converter 5 is actually normal, compared to the case where the threshold value NGnth is set to 1. This makes it possible to reduce the possibility that the AD converter 5 is erroneously determined to be abnormal due to the influence of the noise, and improve the accuracy of determining the abnormality of the AD converter 5.

  On the other hand, when the higher-level control unit 6 determines that at least one of the counter values NGn corresponding to all types of self-diagnosis 1-bit pulse data Svn is equal to or larger than the threshold value NGnth (step S405: Yes), it is determined that the AD converter 5 is abnormal (step S406), and the self-diagnosis processing ends. As described above, since the counter value NGn is prepared for each type of the self-diagnosis 1-bit pulse data Svn, whether the AD converter 5 is abnormal is determined for each type of the self-diagnosis 1-bit pulse data Svn. Can be determined.

  Also, when the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Svn matches the digital data Dvn, that is, the higher-level control unit 6 correctly converts the self-diagnosis 1-bit pulse data Svn into the digital data Dvn. If (Yes at Step S402), the counter value OKn is incremented (+1) (Step S407), and the counter value NGn is set to zero (Step S408).

  Next, when the higher-level control unit 6 determines that the counter values OKn respectively corresponding to all types of 1-bit pulse data for self-diagnosis Svn are not equal to or larger than the threshold value OKnth (step S409: No), the process proceeds to step S411.

  On the other hand, if the higher-level control unit 6 determines that the counter values OKn respectively corresponding to all types of 1-bit pulse data Svn for self-diagnosis are equal to or larger than the threshold value OKnth (step S409: Yes), the AD converter 5 operates normally. Is determined (step S410), n is incremented (+1) (step S411), and the process proceeds to step S412.

  Next, in step S412, the higher-level control unit 6 determines whether or not n is greater than a threshold value nth.

  When determining that n is not larger than the threshold value nth (Step S412: No), the higher-level control unit 6 ends the self-diagnosis process, and when determining that n is larger than the threshold value nth (Step S4121 Yes), sets n to “1” (Step S4121). Step S413), the self-diagnosis processing ends.

  Here, the operation of the upper-level control unit 6 of the first embodiment when the AD converter 5 becomes abnormal only for the self-diagnosis 1-bit pulse data Sv1 will be described. Note that n is used in the voltage self-diagnosis processing, the current self-diagnosis processing, and the temperature self-diagnosis processing, and the initial value of each n is “1”. The threshold value nth is the same value as the number of types of 1-bit pulse data for self-diagnosis, and is set to “2”. The counter value OK1, the counter value NG1, the counter value OK2, and the counter value NG2 are each set to “0” as an initial value. The threshold values OK1th and OK2th may be the same value or different values. In the first embodiment, each of the threshold values OK1th and OK2th is “1”. Further, the threshold values NG1th and NG2th may be the same value or different values. In the first embodiment, each of the threshold values is set to “2”. In the following description, only the self-diagnosis processing of the self-diagnosis processing and the AD conversion processing repeatedly performed in FIG. 2 or FIG. 3 will be described.

<First voltage self-diagnosis process>
First, the upper control unit 6 outputs the voltage self-diagnosis command Cv1 (first self-diagnosis command) to the AD converter 5 (step S401), and outputs the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data). If the digital data after A / D conversion does not match the digital data Dv1 (first digital data) (step S402: No), the counter value NG1 is incremented (+1) from "0" to "1". (Step S403), the counter value OK1 is set to “0” (Step S404).

  Next, since the threshold value NG1th (first threshold value) and the threshold value NG2th (second threshold value) are “2”, the counter value NG1 is “1”, and the counter value NG2 is “0”, The unit 6 determines that the counter value NG1 is not equal to or larger than the threshold value NG1th and the counter value NG2 is not equal to or larger than the threshold value NG2th, that is, of the counter values NG1 and NG2 corresponding to the self-diagnosis 1-bit pulse data Sv1 and Sv2, respectively. It is determined that at least one of the counter values NGn is not greater than or equal to the threshold value NGnth (step S405: No), and the first voltage self-diagnosis processing ends.

  Since n is “1”, the voltage self-diagnosis command Cv1 is output again from the upper control unit 6 in the second voltage self-diagnosis processing.

<Second voltage self-diagnosis process>
First, the higher-level control unit 6 outputs the voltage self-diagnosis command Cv1 to the AD converter 5 (step S401), and the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv1 does not match the digital data Dv1. (Step S402: No), the counter value NG1 is incremented (+1) from "1" to "2" (Step S403), and the counter value OK1 is set to "0" (Step S404).

  Next, since the threshold values NG1th and NG2th are “2”, the counter value NG1 is “2”, and the counter value NG2 is “0”, the upper control unit 6 determines that the counter value NG1 is equal to or larger than the threshold value NG1th. It is determined that the counter value NG2 is not equal to or greater than the threshold value NG2th, that is, at least one of the counter values NG1 and NG2 corresponding to the self-diagnosis 1-bit pulse data Sv1 and Sv2 is equal to or greater than the threshold value NGnth. Judgment is made (Step S405: Yes), and it is judged that the AD converter 5 is abnormal (Step S406), and the second voltage self-diagnosis processing ends.

  Since n is “1”, the voltage self-diagnosis command Cv1 is output from the upper control unit 6 in the third voltage self-diagnosis processing.

  The abnormality of the AD converter 5 means that at least one of the changeover switch 10, the digital filter 11, and the storage unit 12 does not operate normally.

  Further, the higher-level control unit 6 determines whether to use the digital data obtained by the AD conversion after the self-diagnosis according to the self-diagnosis result (the determination result as to whether or not the AD converter 5 is abnormal). You may comprise so that it may judge.

  As described above, the upper-level control unit 6 determines that the 1-bit pulse data Sv1 for self-diagnosis (first self-diagnosis data) does not match the digital data after the AD conversion and the digital data Dv1 (first digital data). If NG1th (first threshold value) or more continues, it is determined that the AD converter 5 is abnormal with respect to the self-diagnosis 1-bit pulse data Sv1. That is, the upper control unit 6 determines that there is an abnormality in the AD converter 5 with respect to the voltage.

  Next, the operation of the higher-level control unit 6 of the first embodiment when the A / D converter 5 recovers from the abnormality to the normal state with respect to the self-diagnosis 1-bit pulse data Sv1 will be described. Note that the initial value of the n counter is “1”, the counter value OK1 is “0”, the counter value NG1 is “2”, the counter value OK2 is “0”, and the counter value NG2 is “0”.

<K (≧ 3) th voltage self-diagnosis processing>
First, the upper control unit 6 outputs the voltage self-diagnosis command Cv1 (first self-diagnosis command) to the AD converter 5 (step S401), and outputs the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data). If the digital data after the AD conversion of ()) matches the digital data Dv1 (first digital data) (step S402: Yes), the counter value OK1 is incremented (+1) from “0” to “1” ( In step S407, the counter value NG1 is changed from "2" to "0" (step S408).

  Next, the threshold OK1th (fifth threshold) and the threshold OK2th (sixth threshold) are “1”, the counter value OK1 is “1”, and the counter value OK2 is “0”. The unit 6 determines that the counter value OK1 is equal to or greater than the threshold value OK1th and the counter value OK2 is not equal to or greater than the threshold value OK2th. That is, the counter values OKn respectively corresponding to all types of self-diagnosis 1-bit pulse data Sv1 and Sv2 are determined. It is determined that it is not equal to or greater than the threshold OKnth (step S409: No), and n corresponding to the voltage self-diagnosis processing is incremented (+1) to change from "1" to "2" (step S411).

  Next, since the threshold value nth is “2” and n is “2”, the upper-level control unit 6 determines that n is not larger than the threshold value nth (step S412: No), The diagnostic processing ends.

  Since n is “2”, the voltage self-diagnosis command Cv2 is output from the upper control unit 6 in the (k + 1) th voltage self-diagnosis processing.

<K + 1-th voltage self-diagnosis process>
First, the higher-level control unit 6 outputs a voltage self-diagnosis command Cv2 (second self-diagnosis command) to the AD converter 5 (step S401), and outputs 1-bit pulse data Sv2 for self-diagnosis (second self-diagnosis data). If the digital data after the AD conversion of ()) matches the digital data Dv2 (second digital data) (step S402: Yes), the counter value OK2 is incremented (+1) to “1” from “0” ( In step S407, the NG counter value NG2 is set to "0" (step S408). The digital data Dv2 (second digital data) has a different value from the digital data Dv1 (first digital data). The higher-level control unit 6 may hold the digital data Dv1 and Dv2 by itself or may store the digital data Dv1 and Dv2 in the storage unit 13.

  Next, the threshold value OK1th (fifth threshold value) and the threshold value OK2th (sixth threshold value) are “1”, the counter value OK1 is “1”, and the counter value OK2 is “1”. The unit 6 determines that the counter value OK1 is equal to or larger than the threshold value OK1th and the counter value OK2 is equal to or larger than the threshold value OK2th, that is, the counter values OKn respectively corresponding to all types of the self-diagnosis 1-bit pulse data Sv1 and Sv2. Is greater than or equal to the threshold OKnth (step S409: Yes), and it is determined that the AD converter 5 is normal (step S410). That is, the upper control unit 6 determines that the AD converter 5 is normal with respect to the voltage, in other words, that the AD converter 5 has returned from the abnormal state to the normal state in the voltage self-diagnosis processing. The normal condition of the AD converter 5 is a state in which the changeover switch 10, the digital filter 11, and the storage unit 12 all operate normally.

  Next, the higher-level control unit 6 increments (+1) n in the voltage self-diagnosis process from “2” to “3” (step S411).

  Next, since the threshold value nth is “2” and n is “3”, the higher-level control unit 6 determines that n in the voltage self-diagnosis process is larger than the threshold value nth (step S412: Yes), and In the power self-diagnosis processing, n is changed from "3" to "1" (step S409), and the (k + 1) th voltage self-diagnosis processing ends.

  Since n is “1”, the voltage self-diagnosis command Cv1 is output from the upper control unit 6 in the (k + 2) th voltage self-diagnosis processing.

  As described above, after determining that the AD converter 5 is abnormal, the upper control unit 6 converts the digital data of the 1-bit pulse data Sv1 for self-diagnosis (first self-diagnosis data) after AD conversion into digital data. The coincidence with Dv1 (first digital data) continues for the threshold NG1th or more, and the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv2 (second self-diagnosis data) is digital data Dv2 ( When the coincidence with the second digital data) continues for the threshold value OK2th or more, it can be recognized that the abnormal AD converter 5 has returned to normal.

  Although the threshold value OK1th (fifth threshold value) and the threshold value OK2th (sixth threshold value) are “1”, if both are 2 or more, the normality determination can be performed more accurately.

<Modification of First Embodiment>
FIG. 5 is a flowchart illustrating the operation of the higher-level control unit 6 when performing the voltage self-diagnosis process according to the modification of the first embodiment. Note that the operation of the higher-level control unit 6 when performing the current self-diagnosis processing and the temperature self-diagnosis processing in the modification of the first embodiment is the same as that performed when performing the voltage self-diagnosis processing in the modification of the first embodiment. Since the operation is the same as that of the upper control unit 6, the description thereof is omitted.

  The flowchart shown in FIG. 5 differs from the flowchart shown in FIG. 4 in that the higher-level control unit 6 determines that the total value of the counter values OKn is not greater than or equal to a threshold OKth (seventh threshold) (step S409 ′: No). In step S11, n is incremented (+1), and when it is determined that the total value of the counter values OKn is equal to or larger than the threshold value OKth (step S409 ′: Yes), it is determined in step S410 that the AD converter 5 is normal. It is a point to do. The threshold value OKth is equal to or greater than n, which is the number of types of 1-bit pulse data for self-diagnosis. However, if it is equal to or greater than (n × 2), the normality determination can be performed more accurately.

  As an example, when the threshold value NG1th is “2” and the counter value NG1 becomes “2”, the upper control unit 6 determines that at least one of the counter values NG1 and NG2 is equal to or larger than the threshold value NGnth. (Step S405: Yes), it is determined that the AD converter 5 is abnormal.

  Next, in the case where the threshold value OKth is “2”, when the counter value OK1 becomes “1” and the counter value OK2 becomes “1”, the higher-level control unit 6 sets the total value of the counter value OK1 and the counter value OK2. Is greater than or equal to the threshold OKth (step S409 ′: Yes), and it is determined that the AD converter 5 is normal (step S410).

  As described above, after determining that the AD converter 5 is abnormal, the upper control unit 6 in the modification of the first embodiment performs the AD conversion of the 1-bit pulse data Sv1 for self-diagnosis (first self-diagnosis data). Is the same as the digital data Dv1 (first digital data), and the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv2 (second self-diagnosis data) is the digital data Dv2 (second digital data). If the total value of coincidences with the digital data (i.e., digital data) continues for a threshold value OKth (seventh threshold value) or more, it is determined that the AD converter 5 is normal.

  That is, in the first embodiment and the modification of the first embodiment, the higher-level control unit 6 converts the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data) into the digital data Dv1 (first self-diagnosis data). In the case of coincidence with the first digital data, the self-diagnosis instruction Cv2 (second self-diagnosis instruction) is output, and the digital data of the 1-bit pulse data for self-diagnosis Sv2 (second self-diagnosis data) after AD conversion is converted. , And the digital data Dv2 (second digital data), the self-diagnosis command Cv1 (first self-diagnosis command) is output, and the AD of the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data) is output. When the converted digital data does not match the digital data Dv1 (first digital data), the self-diagnosis instruction Cv1 (first self-diagnosis instruction) is again performed. When the output digital data of the self-diagnosis 1-bit pulse data Sv2 (second self-diagnosis data) does not match the digital data Dv2 (second digital data), the self-diagnosis instruction Cv2 ( (A second self-diagnosis instruction).

  In the first embodiment and the modification of the first embodiment, the higher-level control unit 6 converts the digital data after the AD conversion of the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data) into the digital data Dv1 (first self-diagnosis data). If the digital data after the A / D conversion of the 1-bit pulse data Sv2 (second self-diagnosis data) for self-diagnosis is equal to or more than the threshold NG1th (first threshold) or not, When the non-coincidence with the digital data Dv2 (second digital data) continues for the threshold NG2th (second threshold) or more, it is determined that the AD converter 5 is abnormal. Thus, it is possible to determine whether or not the AD converter 5 is abnormal for each type of the self-diagnosis data (the self-diagnosis 1-bit pulse data Sv1 and Sv2) input to the AD converter 5.

  Further, in the modified example of the first embodiment, the type of the threshold OKnth for determining whether the AD converter 5 is normal can be reduced as compared with the first embodiment, and the threshold OKnth is stored. For this purpose, the storage area inside the upper control unit 6 or the storage area of the storage unit 13 can be reduced.

<Example 2>
FIG. 6 is a flowchart illustrating the operation of the upper control unit 6 when performing the voltage self-diagnosis processing according to the second embodiment. The operation of the higher-level control unit 6 when performing the current self-diagnosis processing and the temperature self-diagnosis processing in the second embodiment is the same as the operation of the higher-level control unit 6 when performing the voltage self-diagnosis processing in the second embodiment. The description is omitted here.

  The flowchart shown in FIG. 6 differs from the flowchart shown in FIG. 4 in that the higher-level control unit 6 determines that the 1-bit pulse data Svn for self-diagnosis is not correctly converted into the digital data Dvn (step S402: No). , The voltage self-diagnosis process is not immediately terminated, and the process proceeds to step S411, where n is incremented (+1). That is, in the second embodiment, the self-diagnosis 1-bit pulse data Sv1 and Sv2 are output alternately regardless of whether or not the self-diagnosis 1-bit pulse data Svn is correctly converted into the digital data Dvn. The other operations in the flowchart shown in FIG. 6 are the same as those in the flowchart shown in FIG.

  Here, the operation of the higher-level control unit 6 of the second embodiment when the AD converter 5 becomes abnormal only for the self-diagnosis 1-bit pulse data Sv1 will be described. Note that the initial value of the n counter is “1”, and the threshold value nth is “2”. The counter value OK1, the counter value NG1, the counter value OK2, and the counter value NG2 are each set to “0”. Further, the threshold NG1th and the threshold NG2th are each “2”, and the threshold OK1th and the threshold OK2th are each “1”.

<First voltage self-diagnosis process>
First, the upper control unit 6 outputs the voltage self-diagnosis command Cv1 (first self-diagnosis command) to the AD converter 5 (step S401), and outputs the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data). If the digital data after A / D conversion does not match the digital data Dv1 (first digital data) (step S402: No), the counter value NG1 is incremented (+1) from "0" to "1". (Step S403), the counter value OK1 is set to “0” (Step S404).

  Next, since the threshold value NG1th (third threshold value) and the threshold value NG2th (fourth threshold value) are “2”, the counter value NG1 is “1”, and the counter value NG2 is “0”, The unit 6 determines that the counter value NG1 is not greater than or equal to the threshold value NG1thth and that the counter value NG2 is not greater than or equal to the threshold value NG2th. That is, of the counter values NG1 and NG2 corresponding to the self-diagnosis 1-bit pulse data Sv1 and Sv2, respectively. It is determined that at least one of the counter values NGn is not greater than or equal to the threshold value NGnth (step S405: No), and n corresponding to the voltage self-diagnosis processing is incremented (+1) to change from “1” to “2” (step S405). S411).

  Next, since the threshold value nth is “2” and n is “2”, the upper-level control unit 6 determines that n is not larger than the threshold value nth (Step S412: No). The diagnostic processing ends.

  Since n is “2”, the voltage self-diagnosis command Cv2 is output from the upper control unit 6 in the second voltage self-diagnosis processing.

<Second voltage self-diagnosis process>
First, the higher-level control unit 6 outputs a voltage self-diagnosis command Cv2 (second self-diagnosis command) to the AD converter 5 (step S401), and outputs 1-bit pulse data Sv2 for self-diagnosis (second self-diagnosis data). If the digital data after the AD conversion of ()) matches the digital data Dv2 (second digital data) (step S402: Yes), the counter value OK2 is incremented (+1) to “1” from “0” ( In step S407, the counter value NG2 is set to "0" (step S408).

  Next, since the threshold value OK1th and the threshold value OK2th are “1”, the counter value OK1 is “0”, and the counter value OK2 is “1”, the upper-level control unit 6 determines that the counter value OK1 is greater than or equal to the threshold value OK1th. No, it is determined that the counter value OK2 is equal to or greater than the threshold value OK2th, that is, it is determined that the counter values OKn corresponding to all types of 1-bit pulse data Sv1 and Sv2 for self-diagnosis are not equal to or greater than the threshold value OKnth (step S409: No), n corresponding to the voltage self-diagnosis process is incremented (+1) to change from "2" to "3" (step S411).

  Next, since the threshold value nth is “2” and n is “3”, the upper-level control unit 6 determines that n is larger than the threshold value nth (step S412: Yes), and changes n from “3” to “3”. 1 "(step S413), and the second voltage self-diagnosis processing ends.

  Since n is “1”, the voltage self-diagnosis command Cv1 is output from the upper control unit 6 in the third voltage self-diagnosis processing.

<Third voltage self-diagnosis process>
First, the upper control unit 6 outputs the voltage self-diagnosis command Cv1 (first self-diagnosis command) to the AD converter 5 (step S401), and outputs the self-diagnosis 1-bit pulse data Sv1 (first self-diagnosis data). If the digital data after A / D conversion does not match the digital data Dv1 (first digital data) (step S402: No), the counter value NG1 is incremented (+1) to “2” from “1”. (Step S403), the counter value OK1 is set to “0” (Step S404).

  Next, since the threshold value NG1th (third threshold value) and the threshold value NG2th (fourth threshold value) are “2”, the counter value NG1 is “2”, and the counter value NG2 is “0”, The unit 6 determines that the counter value NG1 is equal to or greater than the threshold value NG1thth and the counter value NG2 is not equal to or greater than the threshold value NG2th, that is, the counter value NG1 or NG2 corresponding to the self-diagnosis 1-bit pulse data Sv1 or Sv2, respectively. Is determined to be greater than or equal to the threshold value NGnth (step S405: Yes), and the AD converter 5 is determined to be abnormal (step S406).

  Next, the higher-level control unit 6 increments (+1) n in the voltage self-diagnosis processing from “1” to “2” (step S411).

  Next, since the threshold value nth is “2” and n is “2”, the upper-level control unit 6 determines that n is not larger than the threshold value nth (Step S412: No), The diagnostic processing ends.

  Since n is “2”, the voltage self-diagnosis command Cv2 is output from the upper control unit 6 in the fourth voltage self-diagnosis processing.

  Further, the higher-level control unit 6 determines whether to use the digital data obtained by the AD conversion after the self-diagnosis according to the self-diagnosis result (the determination result as to whether or not the AD converter 5 is abnormal). You may comprise so that it may judge.

  As described above, the upper-level control unit 6 determines that the digital data of the 1-bit pulse data for self-diagnosis Sv1 (first self-diagnosis data) after AD conversion does not match the digital data Dv1 (first digital data). When the threshold value NG1th (third threshold value) or more is continuous, it is determined that the AD converter 5 is abnormal with respect to the self-diagnosis 1-bit pulse data Sv1. That is, the upper control unit 6 determines that there is an abnormality in the AD converter 5 with respect to the voltage.

  Note that the operation of the upper-level control unit 6 of the second embodiment when the AD converter 5 returns to normal from the abnormality in the voltage self-diagnosis processing is as follows. In this case, the operation is the same as the operation of the higher-level control unit 6 in the first embodiment, and thus the description thereof is omitted.

<Modification of Second Embodiment>
FIG. 7 is a flowchart illustrating the operation of the higher-level control unit 6 when performing the self-diagnosis processing according to the modification of the second embodiment. Note that the operation of the upper-level control unit 6 when performing the current self-diagnosis processing and the temperature self-diagnosis processing in the modification of the second embodiment is the same as that performed when performing the voltage self-diagnosis processing in the modification of the second embodiment. Since the operation is the same as that of the upper control unit 6, the description thereof is omitted.

  The flowchart shown in FIG. 7 differs from the flowchart shown in FIG. 6 in that the higher-level control unit 6 determines that the total value of the counter values OKn is not more than the threshold value OKth (seventh threshold value) (step S409 ″: No). In step S11, n is incremented (+1), and when it is determined that the total value of the counter values OKn is equal to or larger than the threshold value OKth (step S409 ″: Yes), the AD converter 5 is normal in step S410. It is a point to judge.

  As an example, when the threshold value NG1th is “2” and the counter value NG1 becomes “2”, the upper control unit 6 determines that at least one of the counter values NG1 and NG2 is equal to or larger than the threshold value NGnth. (Step S405: Yes), it is determined that the AD converter 5 is abnormal.

  Next, in the case where the threshold value OKth is “2”, when the counter value OK1 becomes “1” and the counter value OK2 becomes “1”, the higher-level control unit 6 sets the total value of the counter value OK1 and the counter value OK2. Is greater than or equal to the threshold value OKth (step S409 ″: Yes), and it is determined that the AD converter 5 is normal (step S410).

  As described above, the upper-level control unit 6 in the modification of the second embodiment, like the upper-level control unit 6 in the modification of the first embodiment, determines that the A / D converter 5 is abnormal, and then performs a 1-bit self-diagnosis. The digital data obtained by AD conversion of the pulse data Sv1 (first self-diagnosis data) matches the digital data Dv1 (first digital data), and the 1-bit pulse data Sv2 for self-diagnosis (second self-diagnosis) The AD converter 5 is normal when the sum of the coincidence of the digital data after the AD conversion of the data) with the digital data Dv2 (the second digital data) exceeds the threshold value OKth (the seventh threshold value). Judge.

  That is, in the second embodiment and the modification of the second embodiment, the higher-level control unit 6 sets the voltage regardless of whether the digital data after the AD conversion of the 1-bit pulse data for self-diagnosis matches the digital data Dvn. The self-diagnosis instructions Cv1 and Cv2 (first and second self-diagnosis instructions) are sequentially and repeatedly output.

  In the second embodiment and the modification of the second embodiment, the upper control unit 6 performs the self-diagnosis 1-bit pulse data Sv1 (the first self-diagnosis data) similarly to the higher control unit 6 in the modification of the first embodiment. ), If the digital data after AD conversion does not match the digital data Dv1 (first digital data) for more than the threshold NG1th (third threshold) or the 1-bit pulse data Sv2 for self-diagnosis (first digital data). If the digital data after the A / D conversion of the self-diagnosis data 2) does not match the digital data Dv2 (the second digital data) continuously for the threshold NG2th (fourth threshold) or more, the AD converter 5 is abnormal. Judge that there is. Thus, it is possible to determine whether or not the AD converter 5 is abnormal for each type of the self-diagnosis data (the self-diagnosis 1-bit pulse data Sv1 and Sv2) input to the AD converter 5.

  Further, in the modified example of the second embodiment, the type of the threshold OKnth for determining whether the AD converter 5 is normal can be reduced as compared with the second embodiment, and the threshold OKnth is stored. For this purpose, the storage area inside the upper control unit 6 or the storage area of the storage unit 13 can be reduced.

  As described above, the AD converter 1 of the present embodiment can determine whether or not the AD converter 5 is abnormal for each type of 1-bit pulse data for self-diagnosis. Even when it is determined that the digital data does not match only in the 1-bit pulse data for use, the AD converter 5 can be determined to be abnormal.

  In addition, in the AD converter 1 of the present embodiment, since the self-diagnosis data output unit 9 outputs 1-bit pulse data for self-diagnosis to the digital filter 11, the self-diagnosis data output unit 9 sends the self-diagnosis to the modulator 8 or the multiplexer 7. As compared with the configuration in which the analog value is output, the conversion error by the modulator 8 can be prevented from being included in the digital data, and it can be accurately determined whether the 1-bit pulse data for self-diagnosis has been correctly converted into the digital data. You can judge.

  Further, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention.

<Modification 1>
The self-diagnosis analog values Av1 and Av2 may be output as self-diagnosis data from the self-diagnosis data output unit 9 to the multiplexer 7. In such a configuration, the modulator 8 converts the analog value Av1 for self-diagnosis into 1-bit pulse data Sv1 for self-diagnosis, and converts the analog value Av2 for self-diagnosis into 1-bit pulse data Sv2 for self-diagnosis. I do. Further, the changeover switch 10 can be omitted. If the digital data after the A / D conversion of the 1-bit pulse data for self-diagnosis does not match the digital data corresponding to the 1-bit pulse data for self-diagnosis for more than the threshold value NGnth, the changeover switch 10 and the digital filter 11 , And the storage unit 12 as well as the multiplexer 7 and the modulator 8 can be determined to be abnormal. The same applies to the current self-diagnosis processing and the temperature self-diagnosis processing.

<Modification 2>
The self-diagnosis data output unit 9 may output the self-diagnosis analog values Av1 and Av2 to the modulator 8 as self-diagnosis data. In such a configuration, the modulator 8 converts the analog value Av1 for self-diagnosis into 1-bit pulse data Sv1 for self-diagnosis, and converts the analog value Av2 for self-diagnosis into 1-bit pulse data Sv2 for self-diagnosis. I do. The changeover switch 10 is connected not between the modulator 8 and the digital filter 11 but between the multiplexer 7 and the modulator 8. If the digital data after the A / D conversion of the 1-bit pulse data for self-diagnosis does not match the digital data corresponding to the 1-bit pulse data for self-diagnosis for more than the threshold value NGnth, the changeover switch 10 and the digital filter 11 , And the storage unit 12 as well as the modulator 8 can be determined to be abnormal. The same applies to the current self-diagnosis processing and the temperature self-diagnosis processing.

  When the first and second modifications are adopted, the AD converter 5 includes a self-diagnosis data output unit 9 for outputting a self-diagnosis analog value as self-diagnosis data, and a 1-bit pulse data for measuring a measured analog value. And a digital filter 11 for converting the analog value for self-diagnosis into 1-bit pulse data for self-diagnosis, a digital filter 11 for converting 1-bit pulse data for measurement and 1-bit pulse data for self-diagnosis into digital data, and a digital filter. And a storage unit 12 for storing digital data converted by the storage unit 11.

  When the first and second modifications are adopted, the modulator 8 may have the function of the digital filter 11. That is, the modulator 8 may function as a digital filter that converts the measured 1-bit pulse data and the self-diagnosis 1-bit pulse data into digital data. In the case of such a configuration, the digital filter 11 can be omitted.

<Modification 3>
In the flowcharts shown in FIGS. 4 to 7, the digital data after the AD conversion of the 1-bit pulse data for self-diagnosis Sv1 (first self-diagnosis data) used in the voltage self-diagnosis process Pv1 is referred to as a voltage self-diagnosis process. It is assumed that each bit of a bit string constituting the digital data after AD conversion of the self-diagnosis 1-bit pulse data Sv2 (second self-diagnosis data) used for Pv2 is inverted. Thus, the digital data obtained by AD conversion of the self-diagnosis 1-bit pulse data Sv1 used in the voltage self-diagnosis process Pv1 is converted to the AD of the self-diagnosis 1-bit pulse data Sv2 used in the voltage self-diagnosis process Pv2. The value can be easily separated from the converted digital data. The same applies to the current self-diagnosis processing and the temperature self-diagnosis processing.

Reference Signs List 1 AD converter 2 Voltage measuring unit 3 Current measuring unit 4 Temperature measuring unit 5 AD converter 6 Host control unit 7 Multiplexer 8 Modulator 9 Self-diagnosis data output unit 10 Changeover switch 11 Digital filter 12 Storage unit 13 Storage unit Ve Vehicle Lo load BP Battery Pack B Battery

Claims (7)

An upper-level control unit that outputs first and second self-diagnosis instructions;
An A / D converter for AD-converting the first self-diagnosis data when the first self-diagnosis command is input, and AD-converting the second self-diagnosis data when the second self-diagnosis command is input When,
With
The higher-level control unit includes:
Outputting the first self-diagnosis instruction, and outputting the second self-diagnosis instruction when the digital data after the AD conversion of the first self-diagnosis data matches the first digital data;
Outputting the second self-diagnosis instruction, and outputting the first self-diagnosis instruction when the digital data after the AD conversion of the second self-diagnosis data matches the second digital data;
Outputting the first self-diagnosis instruction, and outputting the first self-diagnosis instruction again when the digital data after AD conversion of the first self-diagnosis data does not match the first digital data;
Outputting the second self-diagnosis instruction, and outputting the second self-diagnosis instruction again when the digital data after AD conversion of the second self-diagnosis data does not match the second digital data;
When the digital data after the AD conversion of the first self-diagnosis data does not match the first digital data continuously for a first threshold or more, or when the digital conversion after the AD conversion of the second self-diagnosis data is performed If the data does not match the second digital data continuously for a second threshold or more, it is determined that the AD converter is abnormal. A higher-level control unit that sequentially and repeatedly outputs the first and second self-diagnosis instructions;
An A / D converter for AD-converting the first self-diagnosis data when the first self-diagnosis command is input, and AD-converting the second self-diagnosis data when the second self-diagnosis command is input When,
With
The higher-level control unit may determine that the digital data after the AD conversion of the first self-diagnosis data does not match the first digital data continuously for a third threshold or more, or If the digital data after AD conversion does not match the second digital data continuously for a fourth threshold or more, it is determined that the AD converter is abnormal. The AD converter according to claim 1, wherein:
After determining that the A / D converter is abnormal, the higher-level control unit determines that the digital data of the first self-diagnosis data after the A / D conversion matches the first digital data is equal to or greater than a fifth threshold value. If continuous, and if the digital data after AD conversion of the second self-diagnosis data coincides with the second digital data for a sixth threshold or more, the AD converter is normal. An AD converter characterized in that: The AD converter according to claim 1, wherein:
The upper control unit, after determining that the AD converter is abnormal, that the digital data after AD conversion of the first self-diagnosis data matches the first digital data; and If the total value of the coincidence of the digital data of the self-diagnosis data after the AD conversion with the second digital data continues for a seventh threshold or more, it is determined that the AD converter is normal. AD converter. The AD converter according to claim 1, wherein:
The digital data after the AD conversion of the first self-diagnosis data is obtained by inverting each bit of a bit string constituting the digital data after the AD conversion of the second self-diagnosis data. Conversion device. A higher-level control unit that outputs first and second self-diagnosis instructions; and, when the first self-diagnosis instruction is input, AD-converts the first self-diagnosis data and receives the second self-diagnosis instruction. A self-diagnosis method for an AD conversion device including: an AD converter that performs AD conversion of the second self-diagnosis data.
The higher-level control unit includes:
Outputting the first self-diagnosis instruction, and outputting the second self-diagnosis instruction when the digital data after the AD conversion of the first self-diagnosis data matches the first digital data;
Outputting the second self-diagnosis instruction, and outputting the first self-diagnosis instruction when the digital data after the AD conversion of the second self-diagnosis data matches the second digital data;
Outputting the first self-diagnosis instruction, and outputting the first self-diagnosis instruction again when the digital data after AD conversion of the first self-diagnosis data does not match the first digital data;
Outputting the second self-diagnosis instruction, and outputting the second self-diagnosis instruction again when the digital data after AD conversion of the second self-diagnosis data does not match the second digital data;
When the digital data after the AD conversion of the first self-diagnosis data does not match the first digital data continuously for a first threshold or more, or when the digital conversion after the AD conversion of the second self-diagnosis data is performed If the data does not match the second digital data continuously for a second threshold or more, it is determined that the AD converter is abnormal. A higher-level control unit that sequentially and repeatedly outputs the first and second self-diagnosis instructions; and, when the first self-diagnosis instruction is input, AD-converts the first self-diagnosis data and outputs the second self-diagnosis instruction. Is input, an AD converter for AD-converting the second self-diagnosis data is provided.
The higher-level control unit may determine that the digital data after the AD conversion of the first self-diagnosis data does not match the first digital data continuously for a third threshold or more, or A self-diagnosis method comprising: determining that the AD converter is abnormal when the digital data after AD conversion does not match the second digital data continuously for a fourth threshold or more.

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