JP2018165659A - Irregularity detection system, and irregularity detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently detect whether an irregularity detection device detecting irregularity of a battery works normally.SOLUTION: An irregularity detection system according to an embodiment comprises: a first irregularity detection device; and a second irregularity detection device. The first irregularity detection device comprises: a first acquisition unit ; and a first detection unit. The first acquisition unit is configured to acquire information indicative of a battery state from a sensor via an input signal line, and the first detection unit is configured to detect irregularity of the battery on the basis of the acquired information. The second irregularity detection device comprises: a second acquisition unit; and a second detection unit. The second acquisition unit is configured to acquire information from the sensor via the input signal line. The second detection unit is configured to detect the irregularity of the battery on the basis of the acquired information. The first irregularity detection device is configured to output test information to the input signal line. The second detection unit is configured to detect irregularity of the battery from the acquired test information. The first irregularity detection device is configured to determine presence or absence of irregularity of the second irregularity detection device in accordance with a detection result of the second detection unit.SELECTED DRAWING: Figure 1B

Description

  The present invention relates to an abnormality detection system and an abnormality detection device.

  Conventionally, for example, vehicles such as hybrid vehicles and electric vehicles include a battery such as a lithium ion secondary battery as a power source for supplying electric power to a motor as a power source. A device that monitors the state of the battery and detects an abnormality is connected to the battery.

  For example, such a device has a comparator that monitors the state of the battery, and checks whether the comparator can normally perform a monitoring operation when the secondary battery is in a normal state (see, for example, Patent Document 1).

JP 2006-64639 A

  However, the technique described in Patent Document 1 has room for further improvement in that it efficiently detects whether or not a device that detects battery abnormality operates normally.

  For example, Patent Document 1 merely detects the presence / absence of an abnormality of a comparator. For example, an abnormality that has occurred other than a comparator such as a signal line needs to be detected individually for each abnormality.

  One embodiment of the present invention has been made in view of the above, and provides an abnormality detection system and an abnormality detection device that can efficiently detect whether or not an abnormality detection device that detects battery abnormality is normal. The purpose is to provide.

  An abnormality detection system according to an aspect of an embodiment includes a first abnormality detection device and a second abnormality detection device. The first abnormality detection device includes a first acquisition unit and a first detection unit. A 1st acquisition part acquires the information which shows the state of a battery from a sensor via the signal line for input. The first detection unit detects a battery abnormality based on the information acquired by the first acquisition unit. The second abnormality detection device includes a second acquisition unit and a second detection unit. The second acquisition unit acquires information indicating the state of the battery from the sensor via the input signal line. The second detection unit detects a battery abnormality based on the information acquired by the second acquisition unit. In addition, the first abnormality detection device outputs test information to the input signal line. The second detection unit of the second abnormality detection device detects an abnormality of the battery based on the test information acquired by the second acquisition unit via the input signal line. The first abnormality detection device determines whether there is an abnormality in the second abnormality detection device according to the detection result detected by the second detection unit based on the test information.

  According to one aspect of the embodiment, it is possible to efficiently detect whether or not the abnormality detection device that detects abnormality of the battery is normal.

Drawing 1A is a figure explaining the outline of the battery system concerning an embodiment. Drawing 1B is a figure explaining the outline of the battery system concerning an embodiment. FIG. 2 is a block diagram illustrating a configuration example of the battery system according to the embodiment. FIG. 3 is a diagram illustrating signals transmitted and received between the abnormality detection system and the sensor according to the embodiment. FIG. 4 is a flowchart illustrating a processing procedure of an operation test process executed by the first abnormality detection device according to the embodiment.

  Hereinafter, embodiments of an abnormality detection system and an abnormality detection device disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

  The abnormality detection system 1 according to the embodiment is used in a battery system S including a battery such as a lithium ion secondary battery, for example, and detects an abnormality of the battery as a monitoring target.

  The battery system S is mounted on a vehicle such as a hybrid vehicle (HEV), an electric vehicle (EV), and a fuel cell vehicle (FCV) (not shown). The battery system S is a system that supplies electric power to a motor that is a power source of the vehicle. First, the outline of the battery system S according to the embodiment will be described with reference to FIGS. 1A and 1B.

<1. Outline of Battery System>
1A and 1B are diagrams illustrating an overview of a battery system S according to an embodiment. As shown in FIG. 1A, the battery system S according to the embodiment includes a battery 2, a sensor 3, and an abnormality detection system 1.

  The battery 2 is, for example, a lithium ion secondary battery, and supplies (discharges) electric power to a load (not shown) such as a motor. Further, the battery 2 is charged by receiving supply of electric power generated by regenerative braking of the motor, for example.

  The sensor 3 detects information indicating the state of the battery 2. Examples of the information indicating the state of the battery 2 include a voltage value, a current value, and a temperature of the battery 2. The sensor 3 has an A / D converter when detecting the voltage value of the battery 2, for example. For example, the sensor 3 includes a current detection unit when detecting the current value of the battery 2 and a temperature sensor when detecting the temperature.

  Note that the information detected by the sensor 3 is not limited to one. For example, the sensor 3 may detect two of the voltage value, current value, and temperature of the battery 2, or may detect all three. Hereinafter, in order to simplify the description, it is assumed that the sensor 3 detects the voltage value of the battery 2.

  The abnormality detection system 1 detects an abnormality of the battery 2 based on the voltage value of the battery 2 detected by the sensor 3. As shown in FIG. 1A, the abnormality detection system 1 includes a first abnormality detection device 10 and a second abnormality detection device 20. The first and second abnormality detection devices 10 and 20 detect the abnormality of the battery 2 based on the voltage value detected by the sensor 3, respectively.

  As described above, the abnormality detection system 1 detects the abnormality of the battery 2 by the two systems of the first abnormality detection device 10 and the second abnormality detection device 20. Therefore, even if one of the first and second abnormality detection devices 10 and 20 fails, the abnormality of the battery 2 can be detected and the safety of the battery system S can be improved.

  As illustrated in FIG. 1A, the first abnormality detection device 10 includes a first acquisition unit 11, a first detection unit 12, an information output unit 13, a determination unit 14, and a switch 15. The second abnormality detection device 20 includes a second acquisition unit 21 and a second detection unit 22.

  The 1st acquisition part 11 of the 1st abnormality detection apparatus 10 acquires the voltage value of the battery 2 from the sensor 3 via the signal wire | line MISO (refer the arrow of FIG. 1A). Further, the second acquisition unit 21 of the second abnormality detection device 20 also acquires the voltage value of the battery 2 from the sensor 3 via the signal line MISO, similarly to the first acquisition unit 11. Thus, the signal line MISO is an input signal line to which a voltage value is input from the sensor 3.

  The first detection unit 12 of the first abnormality detection device 10 detects an abnormality of the battery 2 based on the voltage value acquired by the first acquisition unit 11. For example, the first detection unit 12 compares the voltage value with a threshold value, and when the voltage value is equal to or greater than the threshold value, detects that the battery 2 is in an overcharged state.

  Similarly, the second detection unit 22 of the second abnormality detection device 20 detects an abnormality of the battery 2 based on the voltage value acquired by the second acquisition unit 21. At this time, the threshold used by the second detector 22 for comparison with the voltage value may be the same as or different from the threshold used by the first detector 12 for comparison with the voltage value.

  Moreover, the 1st abnormality detection apparatus 10 is provided with the information output part 13, the determination part 14, and the switch 15 as mentioned above, and performs the operation | movement test of the 2nd abnormality detection apparatus 20, A 2nd abnormality detection apparatus 20 abnormalities are detected. Specifically, the first abnormality detection device 10 outputs test information to the second abnormality detection device 20 to perform an operation test, and detects an abnormality in the second abnormality detection device 20 based on the result of the operation test.

  As illustrated in FIG. 1B, the first abnormality detection apparatus 10 connects the information output unit 13 and the signal line MISO by switching the switch 15. The information output unit 13 outputs test information to the second abnormality detection device 20 via the signal line MISO (see the arrow in FIG. 1B). Here, the information output part 13 shall output the voltage value when the battery 2 is normal, for example as test information.

  As described above, the information output unit 13 outputs the test information to the input signal line MISO, so that the second acquisition unit 21 of the second abnormality detection device 20 acquires the detection result of the sensor 3. The test information can be acquired via the input signal line MISO.

  When the second acquisition unit 21 acquires the test information, the second detection unit 22 detects an abnormality of the battery 2 based on the test information. The second detection unit 22 outputs the detection result to the determination unit 14 of the first abnormality detection device 10.

  The determination unit 14 of the first abnormality detection device 10 determines whether an abnormality has occurred in the second abnormality detection device 20 based on the detection result of the second detection unit 22. For example, if the information output unit 13 outputs the voltage value indicating that the battery 2 is normal as the test information, but the second detection unit 22 detects an abnormality in the battery 2, the determination unit 14 2 It is determined that an abnormality has occurred in the detection unit 22.

  Here, the first abnormality detection apparatus 10 according to the embodiment outputs test information to the second abnormality detection apparatus 20 via the input signal line MISO into which the voltage value is input from the sensor 3. Therefore, when an abnormality such as a disconnection occurs in the signal line MISO, the second abnormality detection device 20 cannot acquire test information, and the second detection unit 22 outputs an erroneous detection result to the determination unit 14. become.

  As described above, the information output unit 13 outputs the test information to the signal line MISO, so that even when an abnormality occurs in the signal line MISO, the determination unit 14 detects that the abnormality has occurred. be able to. That is, the first abnormality detection device 10 can determine whether there is an abnormality in the second abnormality detection device 20 including the signal line MISO.

  As described above, the abnormality detection system 1 outputs the test information to the second abnormality detection device 20 via the signal line MISO to which the voltage value is input from the sensor 3. Thereby, the abnormality detection system 1 detects an abnormality that has occurred in at least one of the second acquisition unit 21, the second detection unit 22, and the signal line MISO of the second abnormality detection device 20 using one test information. be able to. As described above, the abnormality detection system 1 according to the present embodiment can efficiently detect the abnormality of the second abnormality detection device 20 including the signal line MISO.

  Here, the information output unit 13 outputs the voltage value indicating that the battery 2 is normal as the test information, but the present invention is not limited to this. For example, the information output unit 13 may output a voltage value indicating that the battery 2 is abnormal as test information, or a voltage value indicating that the battery 2 is normal and the battery 2 is abnormal. Both of the voltage values indicating may be output. Below, the detail of the battery system S containing the abnormality detection system 1 is demonstrated.

<2. Details of the battery system>
Details of the battery system S according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration example of the battery system S according to the embodiment. In FIG. 2, constituent elements necessary for explaining the characteristics of the embodiment are represented by functional blocks, and descriptions of general constituent elements are omitted.

  In other words, each component illustrated in FIG. 2 is functionally conceptual and does not necessarily need to be physically configured as illustrated. For example, the specific form of distribution / integration of each functional block is not limited to the one shown in the figure, and all or a part thereof is functionally or physically distributed in arbitrary units according to various loads or usage conditions.・ It can be integrated and configured.

  As shown in FIG. 2, the battery system S includes a battery 2, a sensor 3, and an abnormality detection system 1.

<2.1. Battery>
The battery 2 is a lithium ion secondary battery, for example, and is connected to the load 5 via the relay 4. The battery 2 has a configuration in which, for example, a plurality of battery cells (not shown) are connected in series or in parallel. Alternatively, the battery 2 may have a configuration in which, for example, a plurality of battery stacks (not shown) are connected in parallel or in series. The battery stack includes a plurality of battery cells.

  The battery 2 supplies power to the load 5 when the relay 4 is turned on. The load 5 is, for example, a motor, and the battery 2 is charged with electric power generated when the motor is braked.

<2.2. Sensor>
The sensor 3 detects information indicating the state of the battery 2 and outputs a detection result based on an instruction from the abnormality detection system 1. The sensor 3 includes, for example, an A / D converter (not shown), and detects the voltage of the battery 2 (battery voltage).

  Here, the sensor 3 detects the battery voltage, but the present invention is not limited to this. For example, the sensor 3 may detect the voltage (cell voltage) of each cell battery of the battery 2. In this case, the sensor 3 becomes a cell monitoring IC and is provided for each battery stack, for example, and sequentially detects the voltage of the cell battery included in the corresponding battery stack.

  The sensor 3 may detect the current of the battery 2 (battery current) or the current of the cell battery (cell current). Alternatively, the sensor 3 may detect the voltage and current of the battery stack. In addition to the voltage and current described above, the sensor 3 may detect the temperature of the battery 2, for example.

  In addition, here, the information detected by the sensor 3 is one type (voltage), but the present invention is not limited to this. The sensor 3 may detect two or more types of information such as a cell voltage and a cell current.

<2.3. Abnormality detection system>
The abnormality detection system 1 detects an abnormality of the battery 2 based on the battery voltage detected by the sensor 3. The abnormality detection system 1 turns off (cuts off) the relay 4 when detecting an abnormality of the battery 2 such as overcharge or overdischarge. Thereby, charging or discharging of the battery 2 can be stopped, and failure or heat generation of the battery 2 can be suppressed.

  The abnormality detection system includes a first abnormality detection device 10 and a second abnormality detection device 20. The abnormality detection system 1 includes four signal lines that connect the sensor 3 to the first and second abnormality detection devices 10 and 20. The four signal lines are a signal line MISO, a first signal line CS, a second signal line CLK, and a third signal line MOSI, respectively.

  The signal line MISO is an input signal line for inputting the detection result output from the sensor 3 to the first abnormality detection device 10. The first signal line CS is an output signal line for outputting a control signal for controlling the sensor 3 from the first abnormality detection device 10 to the sensor 3.

  The second signal line CLK is an output signal line for outputting a synchronization clock signal from the first abnormality detection device 10 to the sensor 3. The fourth signal line SO is an output signal line for outputting a command such as a designation signal for designating the type of information detected by the sensor 3 from the first abnormality detection device 10 to the sensor 3. The details of each signal that the first abnormality detection apparatus 10 inputs and outputs to each signal line will be described later with reference to FIGS.

<2.3.1. First Abnormality Detection Device>
The first abnormality detection device 10 controls the sensor 3 to acquire a battery voltage, and detects an abnormality of the battery 2 based on the acquired battery voltage. The first abnormality detection device 10 performs an operation test of the second abnormality detection device 20 and detects an abnormality of the second abnormality detection device 20 based on the test result.

  The first abnormality detection device 10 is a microcomputer including a CPU (Central Processing Unit), a first storage unit 140, and the like, and controls the first abnormality detection device 10 as a whole. The first abnormality detection device 10 is mounted on, for example, an ECU (Electronic Control Unit). The first abnormality detection device 10 includes an abnormality detection unit 110, a sensor control unit 120, and an inspection unit 130.

<Sensor control unit>
The sensor control unit 120 controls the sensor 3 by determining the timing for acquiring information from the sensor 3 and the type of information to be acquired. The sensor control unit 120 includes a request output unit 121, a designation signal output unit 122, and a clock output unit 123.

<Request output section>
The request output unit 121 outputs an output request signal for requesting the sensor 3 to output the detection result of the battery voltage via the first signal line CS when the abnormality detection unit 110 detects abnormality of the battery 2. Output.

  The request output unit 121 outputs an output stop signal for stopping output of the detection result of the battery voltage when the abnormality detection unit 110 does not detect abnormality of the battery 2. The output request signal and the output stop signal are also collectively referred to as an output control signal. Details of the output control signal will be described later with reference to FIG.

<Specified signal output section>
The designation signal output unit outputs a designation signal for designating the type of information acquired from the sensor 3 to the sensor 3 via the third signal line MOSI. For example, when the sensor 3 detects a plurality of pieces of information (cell voltage, stack voltage, current, etc.), the designation signal output unit 122 uses the designation signal to specify the type of information (eg, current) acquired from the sensor 3. specify. In addition, when the information acquired from the sensor 3 is one type, the designation signal can be omitted.

<Clock output section>
The clock output unit 123 generates a clock signal that repeats High / Low at a predetermined cycle, and outputs the clock signal to the sensor 3 via the second signal line CLK. The clock signal is used for synchronization when signals are transmitted and received between the sensor 3 and the abnormality detection system 1, such as an output request signal.

<Abnormality detection unit>
The abnormality detection unit 110 detects an abnormality of the battery 2 based on the detection result of the battery voltage input from the sensor 3 while the request output unit 121 outputs the output request signal. The abnormality detection unit 110 includes a first acquisition unit 11, a first detection unit 12, and a first relay control unit 111.

<First acquisition unit>
The first acquisition unit 11 acquires a detection signal indicating the detection result from the sensor 3 while the request output unit 121 outputs an output request signal for requesting the sensor 3 to output a detection result. The first acquisition unit 11 outputs the acquired detection signal to the first detection unit 12.

<First detection unit>
Based on the detection signal acquired by the first acquisition unit 11, the first detection unit 12 compares the detection result of the battery voltage with a threshold value and detects an abnormality of the battery 2. For example, the first detection unit 12 compares the battery voltage value with an overcharge threshold, and detects an abnormality (overcharge) of the battery 2 when the battery voltage value is greater than the overcharge threshold.

  The first detection unit 12 compares the battery voltage value with the overdischarge threshold, and detects an abnormality (overdischarge) of the battery 2 when the battery voltage value is smaller than the overdischarge threshold. The first detection unit 12 outputs the detection result to the first relay control unit 111.

  In addition, the threshold value (overcharge threshold value and overdischarge threshold value) that the first detection unit 12 uses to detect abnormality of the battery 2 is stored in the first storage unit 140 as threshold information 142, for example.

<First relay control unit>
The first relay control unit 111 controls charging / discharging of the battery 2 by cutting off the relay 4 when an abnormality occurs in the battery 2 based on the detection result of the first detection unit 12.

<Inspection Department>
The inspection unit 130 inspects whether or not the second abnormality detection device 20 operates normally. For example, the test unit 130 outputs a test signal 141 stored in the first storage unit 140 as test information while the sensor 3 does not output a detection signal, that is, while the request output unit 121 outputs an output stop signal. The operation test of the second abnormality detection device 20 is performed.

  The inspection unit 130 includes an information output unit 13, a determination unit 14, and a control unit 131.

<Control unit>
The control unit 131 switches the connection destination of the signal line MISO between the first acquisition unit 11 and the information output unit 13 by controlling the switch 15. The control unit 131 controls the switch 15 so that the signal line MISO and the information output unit 13 are connected during the operation test of the second abnormality detection device 20. During other periods, the control unit 131 controls the switch 15 so that the signal line MISO and the first acquisition unit 11 are connected.

  Further, the control unit 131 controls the clock output unit 123 so that a clock signal is output during the operation test of the second abnormality detection device 20. The control unit 131 controls the designation signal output unit 122 to output a designation signal corresponding to the type of the test signal output from the information output unit 13. For example, when the second abnormality detection device 20 detects an abnormality of the battery 2 based on a plurality of pieces of information (for example, a battery voltage value or a battery current value), the designation signal indicates which information is used to perform the operation test. The signal to be specified.

<Information output part>
The information output unit 13 outputs a test signal 141 stored in the first storage unit 140 as test information to the signal line MISO when performing an operation test of the second abnormality detection device 20. The test signal 141 will be described later with reference to FIG.

<Determining unit>
The determination unit 14 determines whether an abnormality has occurred in the second abnormality detection device 20 including the signal line MISO according to the abnormality detection result of the battery 2 based on the test signal 141 by the second abnormality detection device 20.

  For example, when the test signal 141 is a signal indicating an abnormality of the battery 2 and the second abnormality detection device 20 detects an abnormality of the battery 2, the determination unit 14 determines that the second abnormality detection device 20 is normal. It is determined that

  On the other hand, when the test signal 141 is a signal indicating an abnormality of the battery 2, the second abnormality detection device 20 does not detect the abnormality because the battery 2 is normal, or the second abnormality detection device. When the determination signal is not returned from 20, the determination unit 14 determines that an abnormality has occurred in the second abnormality detection device 20.

<2.3.2. Second abnormality detection device>
The second abnormality detection device 20 detects an abnormality of the battery 2 based on a signal acquired via the signal line MISO.

  The second abnormality detection device 20 is a microcomputer including a CPU, a second storage unit 25, and the like, and controls the second abnormality detection device 20 as a whole. The second abnormality detection device 20 is mounted on an IC chip different from the first abnormality detection device 10, such as an ECU different from the first abnormality detection device 10, for example. The second abnormality detection device 20 includes a second acquisition unit 21, a second detection unit 22, an output switching unit 23, and a second relay control unit 24.

<Second acquisition unit>
The second acquisition unit 21 acquires a signal from the sensor 3 or the first abnormality detection device 10 via the signal line MISO in synchronization with the clock signal of the second signal line CLK. When the first abnormality detection device 10 performs an operation test of the second abnormality detection device 20, the second acquisition unit 21 acquires the test signal 141, and when the abnormality detection of the battery 2 is performed, the sensor 3 Obtain the detection signal. The second acquisition unit 21 outputs the acquired signal to the second detection unit 22.

<Second detection unit>
Based on the signal acquired by the second acquisition unit 21, the second detection unit 22 compares the detection result of the battery voltage with a threshold value, and detects an abnormality of the battery 2. For example, the second detection unit 22 compares the battery voltage value with an overcharge threshold, and detects an abnormality (overcharge) of the battery 2 when the battery voltage value is greater than the overcharge threshold.

  The second detection unit 22 compares the battery voltage value with the overdischarge threshold, and detects an abnormality (overdischarge) of the battery 2 when the battery voltage value is smaller than the overdischarge threshold. The second detection unit 22 outputs the detection result to the second relay control unit 24 or the first abnormality detection device 10.

  In addition, the threshold value (overcharge threshold value and overdischarge threshold value) that the second detection unit 22 uses to detect abnormality of the battery 2 is stored in the second storage unit 25 as threshold information 251, for example. The second detection unit 22 acquires a threshold value from the second storage unit 25 according to the type of detection signal included in the designation signal acquired via the third signal line MOSI.

<Second relay control unit>
The second relay control unit 24 controls charging / discharging of the battery 2 by cutting off the relay 4 in accordance with the presence or absence of abnormality of the battery 2 detected by the second detection unit 22 based on the detection signal of the sensor 3. .

<Output switching part>
The output switching unit 23 switches the output destination of the detection result of the second detection unit 22 by controlling the switch 26. For example, the output switching unit 23 sets the output destination of the second detection unit 22 as the second relay control unit 24 while receiving the output request signal via the first signal line CS, and receives the output stop signal while receiving the output stop signal. The first abnormality detection device 10 is assumed.

  As a result, the second abnormality detection device 20 can output the detection result of the second detection unit 22 to the first abnormality detection device 10 while receiving the test signal 141. Therefore, for example, even when the test signal 141 is a signal indicating an abnormality of the battery 2, the second relay control unit 24 does not cut off the relay 4, and the second abnormality detection device 20 is in an operation test. However, the battery 2 can be charged and discharged appropriately.

<2.4. Example of transmission / reception signal>
Here, the signal transmitted / received between the abnormality detection system 1 and the sensor 3 is demonstrated using FIG. FIG. 3 is a diagram illustrating signals transmitted and received between the abnormality detection system 1 and the sensor 3 according to the embodiment. As shown in FIG. 2, the signal line MISO, the first to third signal lines CS, CLK, and SO are branched and connected to the first abnormality detection device 10, the second abnormality detection device 20, and the sensor 3. Is done.

  FIG. 3A is a diagram illustrating an example of a control signal output from the request output unit 121 to the first signal line CS. The request output unit 121 outputs an output request signal 151 (Low signal) for requesting information from the sensor 3 from time t1 to time t2 in FIG. Further, during time t2 to time t5, the request output unit 121 outputs an output stop signal 152 (High signal) that does not request information from the sensor 3.

  As described above, the battery system S is operating in a low active state, and the sensor 3 is operated as shown in FIG. 3D between time t1 and time t2 when the Low signal is output to the first signal line CS. A detection signal 156 is output.

  It is assumed that the request output unit 121 repeatedly outputs the output request signal 151 and the output stop signal 152 at a cycle T1 when the abnormality detection system 1 is activated. As described above, the abnormality detection system 1 repeatedly detects the abnormality of the battery 2 at the cycle T1. Note that a period during which the abnormality detection system 1 detects abnormality of the battery 2 is referred to as an abnormality detection period. The abnormality detection period is, for example, a period from when the abnormality detection system 1 is started to when it is stopped.

  Next, as illustrated in FIG. 3B, the clock output unit 123 outputs the clock signal 153 between time t1 and time t2 when the request output unit 121 outputs the request signal. The clock output unit 123 outputs the clock signal 153 during the operation test of the second abnormality detection device 20 (between time t3 and time t4). As a result, the second abnormality detection device 20 acquires the detection signal 156 or the test signal 141 output from the sensor 3 in synchronization with the clock signal 153.

  As shown in FIG. 3C, the designation signal output unit 122 transmits the designation signal 154 to the third signal line between time t1 and time t2 and from time t3 to time t4 when the clock output unit 123 outputs the clock signal 153. Output to MOSI. Between time t1 and time t2, the sensor 3 outputs a detection signal 156 corresponding to the designation signal 154. Further, the second abnormality detection device 20 detects an abnormality of the battery 2 using a threshold corresponding to the designation signal 154.

  3D, the sensor 3 outputs the detection signal 156 while the request output unit 121 outputs the output request signal 151 (from time t1 to time t2 in FIG. 3A). As shown in FIG. 3E, the information output unit 13 outputs the test signal 141 to the signal line MISO from time t3 to time t4 when the clock output unit 123 outputs the clock signal 153.

  Therefore, when the second abnormality detection device 20 acquires the signal of the signal line MISO in synchronization with the clock signal 153 shown in FIG. 3B, the detection signal 156 is acquired from time t1 to time t2, and from time t3. The test signal 141 is acquired during the time t4.

  As described above, the first abnormality detection device 10 outputs the test signal 141 to the signal line MISO while the sensor 3 is not outputting the detection signal 156, so that the second abnormality detection device 20 is connected via the signal line MISO. Thus, the test signal 141 can be acquired. Further, based on the detection result of the abnormality of the battery 2 performed by the second abnormality detection device 20 based on the test signal 141, the first abnormality detection device 10 can perform an operation test of the second abnormality detection device 20. .

  As shown in FIG. 3, it is possible to ensure a long abnormality detection period by performing the operation test of the second abnormality detection device 20 while the abnormality detection of the battery 2 is not performed (between time t2 and time t5). it can. For example, if the operation test of the second abnormality detection device 20 is performed when the abnormality detection system 1 is activated, the abnormality detection of the battery 2 cannot be detected until the operation test of the second abnormality detection device 20 is performed, and the activation time is reduced. It will be long.

  Therefore, as shown in FIG. 3, an operation test of the second abnormality detection device 20 is performed during an abnormality detection period of the battery 2 and during which the detection signal 156 from the sensor 3 is not acquired (between time t2 and time t5). By doing so, the activation time can be shortened compared with the case of performing at the time of activation. Thereby, the abnormality detection period can be lengthened.

  The operation test of the second abnormality detection device 20 may be performed at least once during the abnormality detection period, and need not be performed every period T1, that is, every period when the detection signal 156 from the sensor 3 is not acquired. However, the operation test of the second abnormality detection device 20 may be performed periodically during the abnormality detection period.

<3. Operation test process>
Next, the procedure of the operation test process executed by the first abnormality detection apparatus 10 according to the embodiment will be described with reference to FIG. FIG. 4 is a flowchart illustrating a processing procedure of an operation test process executed by the first abnormality detection apparatus 10 according to the embodiment. The first abnormality detection device 10 executes the operation test process shown in FIG. 4 at a predetermined timing, for example, when a predetermined period has elapsed since the start.

  The first abnormality detection apparatus 10 determines whether the request output unit 121 outputs an output request signal and requests the sensor 3 to output a detection result (step S101). When the output request signal is output (Yes in step S101), the process returns to step S101 and waits for the output request signal to be output.

  On the other hand, when the request output unit 121 does not output the output request signal (No in step S101), the first abnormality detection device 10 outputs the clock signal 153 to the second signal line CLK (step S102), and the test signal 141 is output to the signal line MISO (step S103). Further, the first abnormality detection device 10 outputs the designation signal 154 to the third signal line MOSI (step S104).

  The second abnormality detection device 20 that has acquired the test signal 141 detects an abnormality of the battery 2 based on the test signal 141 and outputs the detection result to the first abnormality detection device 10. The first abnormality detection device 10 receives this detection result (step S105).

  The first abnormality detection device 10 determines whether or not the result of the abnormality detection of the battery 2 by the second abnormality detection device 20 received in step S105 is correct (step S106).

  When the abnormality detection result is correct (Yes in step S106), the first abnormality detection device 10 determines that the second abnormality detection device 20 is normal (step S107). On the other hand, if the abnormality detection result is incorrect or if the abnormality detection result cannot be received (No in step S106), the first abnormality detection device 10 determines that the second abnormality detection device 20 is abnormal ( Step S108).

  As described above, the first abnormality detection device 10 of the abnormality detection system 1 according to the embodiment outputs the test signal 141 to the signal line MISO for input of the first abnormality detection device 10, thereby causing the signal line MISO to be connected. An operation test of the included second abnormality detection device 20 can be performed. Thereby, the abnormality detection system 1 can detect the abnormality of the second abnormality detection device 20 efficiently.

<4. Modification>
As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various deformation | transformation is possible. Below, such a modification is demonstrated. All the forms including the above embodiment and the forms described below can be appropriately combined.

  Although the abnormality detection system 1 according to the above-described embodiment detects the abnormality of the battery 2 with the two systems of the first abnormality detection device 10 and the second abnormality detection device 20, it is not limited to this. For example, the second abnormality detection device 20 may include a second abnormality detection unit that detects an abnormality of the battery 2 in addition to the abnormality detection unit 110. Thus, by increasing the number of paths through which the abnormality detection system 1 detects an abnormality in the battery 2, redundancy of abnormality detection can be ensured, and the safety of the battery 2 can be further improved.

  In this case, the battery system S may include a plurality of sensors 3. That is, the abnormality detection unit 110 and the second abnormality detection unit of the first abnormality detection device 10 may detect abnormality of the battery 2 based on detection results of different sensors.

  Thereby, for example, even when one of the sensors 3 has a problem and the information of the battery 2 cannot be detected, the abnormality detection system 1 detects the abnormality of the battery 2 based on the information detected by the other sensor 3. Can do. As described above, the safety of the battery 2 can be further improved by ensuring redundancy of abnormality detection including the sensor 3.

  In the abnormality detection system 1 of the above-described embodiment, the first abnormality detection device 10 and the second abnormality detection device 20 are mounted on different IC chips, but the present invention is not limited to this. It is also possible to mount the first abnormality detection device 10 and the second abnormality detection device 20 on the same IC chip.

  If the first abnormality detection device 10 and the second abnormality detection device 20 are mounted on different IC chips, even if a failure occurs in one IC chip, the abnormality detection device mounted on the other IC chip is used. Thus, since the abnormality of the battery 2 can be detected, the safety of the battery 2 can be further improved.

  In the above embodiment, the battery has been described as an example of the monitoring target. However, the present invention is not limited to this. For example, motors and millimeter wave radars can be monitored, and the motor status can be double monitored with current and voltage, or the millimeter wave radar status can be double monitored with measured distance and relative speed information. can do.

<5. Effect>
The abnormality detection system 1 according to the embodiment includes a first abnormality detection device 10 and a second abnormality detection device 20. The first abnormality detection device 10 includes a first acquisition unit 11 and a first detection unit 12. The first acquisition unit 11 acquires information indicating the state of the battery 2 from the sensor 3 via the input signal line MISO. The first detection unit 12 detects an abnormality of the battery 2 based on the information acquired by the first acquisition unit 11.

  The second abnormality detection device 20 includes a second acquisition unit 21 and a second detection unit 22. The second acquisition unit 21 acquires information indicating the state of the battery 2 from the sensor 3 via the input signal line MISO. The second detection unit 22 detects an abnormality of the battery 2 based on the information acquired by the second acquisition unit 21.

  The first abnormality detection device 10 outputs test information (test signal 141) to the input signal line MISO. The second detection unit 22 of the second abnormality detection device 20 detects an abnormality of the battery 2 based on the test information (test signal 141) acquired by the second acquisition unit 21 via the input signal line MISO. The first abnormality detection device 10 determines whether there is an abnormality in the second abnormality detection device 20 according to the detection result detected by the second detection unit 22 based on the test information (test signal 141).

  Thereby, the abnormality detection system 1 can detect the abnormality of the second abnormality detection device 20 including the input signal line MISO, and can efficiently detect the abnormality of the second abnormality detection device 20.

  The first abnormality detection device 10 of the abnormality detection system 1 according to the embodiment further includes a sensor control unit 120 and an information output unit 13. The sensor control unit 120 controls the sensor 3. The information output unit 13 outputs test information (test signal 141) while the sensor control unit 120 performs control so as not to output information to the sensor 3.

  Thereby, the abnormality detection system 1 can perform the operation test of the second abnormality detection device 20 while the sensor 3 does not output the detection result.

  The information output unit 13 of the first abnormality detection device 10 according to the embodiment is an abnormality detection period in which the first detection unit 12 detects an abnormality of the battery 2, and the sensor control unit 120 sends information to the sensor 3. Test information (test signal 141) is output during a period in which control is performed so as not to output.

  Thereby, the abnormality detection system 1 can perform the operation test of the second abnormality detection device 20 during the abnormality detection period in which the abnormality of the battery 2 is detected. For example, compared with the case where an operation test is performed when the abnormality detection system 1 is activated, the activation time can be shortened and the abnormality detection period can be elongated.

  The second abnormality detection device 20 of the abnormality detection system 1 according to the embodiment further includes a control unit (second relay control unit 24) and an output switching unit 23. The control unit (second relay control unit 24) controls charging / discharging of the battery 2 when the second detection unit 22 detects an abnormality of the battery 2. When the second detection unit 22 detects an abnormality in the battery 2 based on the test information (test signal 141), the output switching unit 23 changes the output destination of the detection result from the control unit (second relay control unit 24). 1 Switch to the abnormality detection device 10.

  Thereby, since the 2nd abnormality detection apparatus 20 does not control charging / discharging of the battery 2 at the time of an operation test, charging / discharging of the battery 2 can be performed appropriately at the time of an operation test.

  The first abnormality detection device 10 of the abnormality detection system 1 according to the embodiment further includes a designation signal output unit 122. The designation signal output unit 122 outputs a designation signal 154 that designates the type of information acquired from the sensor 3 to the sensor 3 via the output signal line (third signal line MOSI). Further, when the information output unit 13 outputs test information (test signal 141), the designation signal output unit 122 outputs a designation signal 154 corresponding to the type of the test information (test signal 141).

  Accordingly, the abnormality detection system 1 can perform an operation test of the second abnormality detection device 20 according to the type of information detected by the sensor 3.

  The abnormality detection device (first abnormality detection device 10) according to the embodiment includes an acquisition unit (first acquisition unit 11), a detection unit (first detection unit 12), an information output unit 13, and a determination unit 14. Is provided. The acquisition unit (first acquisition unit 11) acquires information indicating the state of the battery 2 from the sensor 3 via the input signal line MISO. The detection unit (first detection unit 12) detects an abnormality in the battery 2 based on the information acquired by the acquisition unit (first acquisition unit 11). The information output unit 13 outputs test information (test signal 141) via the input signal line MISO to the second abnormality detection device 20 that detects an abnormality of the battery 2 based on the information. The determination unit 14 determines whether there is an abnormality in the second abnormality detection device 20 according to the abnormality detection result of the battery 2 based on the test information (test signal 141) by the second abnormality detection device 20.

  Thereby, the abnormality detection device (first abnormality detection device 10) can detect the abnormality of the second abnormality detection device 20 including the input signal line MISO, and the abnormality of the second abnormality detection device 20 can be efficiently detected. Can be detected.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Abnormality detection system 2 Battery 3 Sensor 10, 20 Abnormality detection apparatus 11, 21 Acquisition part 12, 22 Detection part 13 Information output part 14 Judgment part 120 Sensor control part 121 Request output part 122 Specification signal output part

Claims (6)

A first acquisition unit that acquires information indicating a state of a monitoring target from a sensor via an input signal line;
A first detection unit that detects an abnormality of the monitoring target based on the information acquired by the first acquisition unit;
A first abnormality detection device comprising:
A second acquisition unit for acquiring the information from the sensor via the input signal line;
A second detection unit that detects an abnormality of the monitoring target based on the information acquired by the second acquisition unit;
A second abnormality detection device comprising:
With
The first abnormality detection device includes:
Output test information to the input signal line,
The second detection unit of the second abnormality detection device includes:
Detecting an abnormality of the monitoring target based on the test information acquired by the second acquisition unit via the input signal line;
The first abnormality detection device includes:
An abnormality detection system, wherein the second detection unit determines whether there is an abnormality in the second abnormality detection device according to a detection result detected based on the test information. The first abnormality detection device includes:
A sensor control unit for controlling the sensor;
An information output unit that outputs the test information while the sensor control unit controls the sensor not to output the information;
The abnormality detection system according to claim 1, further comprising: The information output unit of the first abnormality detection device is:
The test information is output during an abnormality detection period in which the first detection unit detects an abnormality of the monitoring target and the sensor control unit performs control so as not to output the information to the sensor. The abnormality detection system according to claim 2. The monitoring target is a battery,
The second abnormality detection device includes:
A control unit that controls charging / discharging of the battery when the second detection unit detects an abnormality of the battery;
An output switching unit that switches an output destination of a detection result from the control unit to the first abnormality detection device when the second detection unit detects an abnormality of the battery based on the test information;
The abnormality detection system according to claim 1, further comprising: The first abnormality detection device includes:
A designation signal that designates the type of the information acquired from the sensor, and a designation signal output unit that outputs the designation signal to the sensor via an output signal line;
The designation signal output unit is
The abnormality detection system according to any one of claims 1 to 4, wherein when the test information is output, the designation signal according to a type of the test information is output. An acquisition unit that acquires information indicating a state of a monitoring target from a sensor via an input signal line;
A detection unit for detecting an abnormality of the monitoring target based on the information acquired by the acquisition unit;
An information output unit that outputs test information via the input signal line to a second abnormality detection device that detects an abnormality of the monitoring target based on the information;
A determination unit that determines presence or absence of an abnormality in the second abnormality detection device in accordance with an abnormality detection result of the monitoring target based on the test information by the second abnormality detection device;
An abnormality detection device comprising:

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