JP5817585B2 - Electronic control unit - Google Patents

Description

  The present invention relates to an electronic control device.

  In an in-vehicle electronic control device such as an ECU, a plurality of control circuits are generally provided, and power from a power supply unit provided in a predetermined control circuit is supplied to the plurality of control circuits via a power supply line. There are many cases. As an example, a power supply unit is provided on the side of a first control circuit configured as an integrated IC, and a power supply line is provided between the first control circuit and a second control circuit such as a microcomputer. For example, a configuration in which power is supplied from the first control circuit side to the second control circuit side through the circuit is used.

JP 2011-53065 A

  By the way, in the electronic control apparatus as described above, since it is assumed that the power supply line is disconnected for some reason, a configuration capable of detecting such a disconnection of the power supply line early and reliably is required.

  As a method of detecting the disconnection of the power supply line, a method of providing a voltage monitoring circuit in parallel with the power supply input to the second control circuit (for example, a microcomputer) can be considered, but when a dedicated voltage monitoring circuit is provided in this way, If it is provided inside the first control circuit or the second control circuit, a terminal for inputting the detection voltage from the power supply line to the voltage monitoring circuit has to be provided separately, and there is a problem that the number of terminals increases. In addition, when such a voltage monitoring circuit is provided outside the first control circuit and the second control circuit, there is a problem that the device configuration tends to be large. Furthermore, in such a voltage monitoring circuit, there is a problem that it is impossible to confirm whether the power supply voltage has surely reached the second control circuit side, and the downstream side of the connection point of the voltage monitoring circuit in the power supply line (second When disconnection occurs on the control circuit side), there is a possibility that the abnormality cannot be detected accurately.

  On the other hand, as a technique related to disconnection detection, there is a technique as disclosed in Patent Document 1. The technique of Patent Document 1 relates to a test apparatus that tests an open state (disconnection) of a device under test, and a power supply unit (32) that supplies a test signal to a power input terminal (22) of the device under test (20). ), A signal supply unit (36) for supplying a test signal to the signal terminal (24) of the device under test (20), and detection for detecting a current flowing from the signal supply unit (36) to the power input terminal (22) Unit (46), and an open determination unit (52) for determining that the space between the signal supply unit (36) and the signal terminal (24) is not open (disconnected). The detection unit (46) supplies the overvoltage input to the signal terminal (24) to the power input terminal (22) in a state where the power supply voltage lower than the voltage supplied to the signal terminal (24) is supplied to the power input terminal (22). 22), the current is detected via the protection diode (66) in the device under test (20) for flowing to the device under test (22), and the open determination unit (52) moves from the signal terminal (24) to the power input terminal (22). When the flowing current is detected, it is determined that it is not in an open state (disconnection).

  In the configuration of Patent Document 1, it is possible to detect a disconnection state under a certain condition, but a configuration in which a dedicated test device is provided outside the device under test, and the above-described problem (problem of increasing the size of the device) ) Cannot be eliminated, and the purpose and the premise configuration are greatly different from the configuration for detecting the disconnection state of the power supply line between the plurality of control circuits.

  In a configuration in which a power supply line and an input / output line are provided between the control circuits to supply power from one control circuit side to the other control circuit side and to input / output signals between the control circuits, the input / output line side In some cases, a protection circuit is provided on the power supply line side to allow current to escape. In this configuration, even if the power supply line is disconnected, the current flows into the power supply line through a protection circuit different from the original power supply path (that is, the power supply line), and the control circuit (first circuit) is in an abnormal state. (2 control circuit) may be supplied with electric power. When such wraparound occurs, for example, the second control circuit is driven with a voltage lower than the original power supply voltage, and there is a concern that unexpected abnormal operation may occur in the second control circuit.

  The present invention has been made to solve the above-described problem, and realizes a configuration capable of detecting a disconnection of a power supply line provided between control circuits with higher accuracy while suppressing an increase in the size of the device configuration. Objective.

In order to achieve the above object, the invention of claim 1 is directed to a power supply terminal (2a) for outputting a voltage based on power from a power supply unit (11) provided inside or outside the circuit, and at least a signal to the outside. A first control circuit (2) having an output terminal (2b) from which an external signal is output and an input terminal (2c) to which at least a signal from the outside is input;
The first control circuit (2) is supplied with power from the first control circuit (2) via a power supply line (L1) connected to the power supply terminal (2a) of the first control circuit (2), and the first control circuit (2 A second control circuit (3) capable of receiving a signal via a signal line (L2) connected to the output terminal (2b) of
With
A protection circuit capable of passing a current from the signal line (L1) side to the power supply line (L2) side between the signal line (L2) connected to the output terminal (2b) and the power supply line (L1). (42) is provided,
The second control circuit (3) operates based on power supply from the power supply line (L1) and receives power supply from the power supply terminal (2a) via the power supply line (L1). A signal processing unit (40) capable of outputting a voltage signal exceeding a reference voltage to the input terminal (2b) of the first control circuit (2) is sometimes provided,
The first control circuit (2)
A determination unit (20) that determines whether or not an abnormal state has occurred in which a voltage signal input from the second control circuit (3) through the input terminal (2c) is equal to or lower than the reference voltage (Vth, Vth1). )When,
A response unit (13) that performs a predetermined response operation when the determination unit (20) determines that the abnormal state has occurred;
It is characterized by having.

According to the first aspect of the present invention, power can be supplied from the first control circuit side to the second control circuit side through the power supply line, and current can be released from the signal line side to the power supply line side. Thus, circuit protection can be achieved.
On the other hand, with this configuration, there is a concern that even if the power supply line is disconnected, current flows from the signal line side to the power supply line side, and the second control circuit is supplied with power in an abnormally low voltage state. The When power is supplied in such a low voltage state, the voltage signal input from the second control circuit to the first control circuit is also lower than the normal voltage (voltage exceeding a predetermined voltage). The determination unit determines whether or not an abnormal state in which the input voltage is equal to or lower than the predetermined voltage has occurred, and accordingly, the response unit can appropriately deal with it. In particular, in this configuration, since it is not necessary to provide an external voltage monitoring circuit outside the first control circuit and the second control circuit, it is possible to suppress an increase in the size of the device configuration and to detect a disconnection state of the power supply line. Since there is no need to provide a dedicated signal monitoring terminal, an increase in the number of terminals can be suppressed. Further, in this configuration, even if a disconnection occurs in the power supply line in the first control circuit or in the second control circuit, and a sneak current occurs from the signal line side to the power supply line side, there is a problem caused by the sneak current. It is possible to detect and respond to normal operations more reliably.

In the invention of claim 2, in the judgment unit (20), a comparison unit (in which a voltage signal inputted from the second control circuit (3) via the input terminal (2c) is compared with a predetermined reference voltage (Vth). 23), and the corresponding part (13) of the first control circuit (2) outputs a voltage signal exceeding the reference voltage (Vth) from the second control circuit (3) to the input terminal (2c). When the comparison unit (23) determines that the voltage signal input through the input terminal (2c) is lower than the reference voltage (Vth) at a predetermined power time, a predetermined response operation is performed.
According to such a configuration, originally a normal signal (a voltage signal exceeding the reference voltage (Vth)) is input through the input terminal (2c), even though it is a predetermined time to be input to the input terminal (2c). Voltage drop (that is, voltage signal output in a low voltage state using a sneak current as a power source) can be reliably detected with a simple configuration. Depending on the part, it becomes possible to respond appropriately.

According to a third aspect of the present invention, the protection circuit (42) includes a protection diode (D1) having an anode connected to the signal line (L2) side and a cathode connected to the power supply line (L1) side. (20) includes a reference voltage generator (21) that generates a reference voltage (Vth), a voltage signal input from the second control circuit (3) via the input terminal (2c), and a reference voltage generator (21 ) Is compared with the reference voltage (Vth) generated in step (1), and the protection diode (D1) has a characteristic that the resistance value decreases as the temperature rises. 21) is generated so as to increase the reference voltage (Vth) as the temperature rises.
In this configuration, when a sudden voltage fluctuation or the like occurs on the signal line side, current can be released via the protection diode.
On the other hand, in this configuration, when a break occurs in the power supply line, current flows from the signal line side to the power supply line side via the protection diode, and thus power supply is performed. Is a value corresponding to the voltage drop across the protection diode. That is, since the resistance value of the protection diode decreases as the temperature rises, the power supply voltage due to the wraparound rises, and the voltage signal resulting from this power supply voltage (the voltage input to the first control circuit via the input terminal) Signal) also increases as the temperature rises. In the present invention, focusing on such characteristics, the reference voltage generator (21) generates the reference voltage (Vth) to be increased according to the temperature rise. It is easy to cancel the fluctuation of the value, and it is possible to set a more appropriate threshold value, and more appropriately monitor the abnormality.

In the invention of claim 4, the judging section (20) compares the voltage signal input from the second control circuit (3) via the input terminal (2c) with the first reference voltage (Vth1) as the reference voltage. In addition, a comparison unit (70) for comparing with a second reference voltage (Vth2) lower than the first reference voltage (Vth1) is provided. The signal processing unit (40) includes a first signal higher than the first reference voltage (Vth1) with respect to the input terminal (2c) and a second reference when the power supply line (L1) is not disconnected. The second signal lower than the voltage (Vth2) is switched and output, and the corresponding part (13) of the first control circuit (2) is connected to the input terminal (2c) from the second control circuit (3). ) At a predetermined time when a voltage signal equal to or higher than the first reference voltage (Vth1) or a voltage signal equal to or lower than the second reference voltage (Vth2) is to be output by the comparator (70) via the input terminal (2c). When it is determined that the input voltage signal is less than the first reference voltage (Vth1) and exceeds the second reference voltage (Vth2) , a predetermined corresponding operation is performed.
In this way, when normal, the signal processing unit sends an H level signal (first signal higher than the first reference voltage) and an L level signal (second signal lower than the second reference voltage) to the first control circuit. Can be switched and output to perform signal transmission. Even if the power supply line is disconnected and a current flows from the signal line side to the power supply line side, even if the second control circuit operates at a low operating voltage, the low output voltage ( A voltage signal lower than the first reference voltage and higher than the second reference voltage) can be detected on the comparison unit side, and an abnormal operation can be detected more reliably without using complicated control.

In the invention of claim 5, the second control circuit (3) includes a low voltage detector (46) for detecting a low voltage state in which the voltage of the power supply line is less than a predetermined low voltage (Vth3), and a low voltage detector. And a processing unit (41) that performs a reset operation of the second control circuit (3) when the low voltage state is detected by (46). The second reference voltage (Vth2) is set to a value approximately equal to the predetermined low voltage (Vth3) or a value lower than the predetermined low voltage.
In this configuration, when the level of the power supply due to the wraparound is a considerably low level that is lower than the second reference voltage, the reset operation can be automatically performed in the second control circuit, and the abnormal operation at this power supply level is possible. Is suppressed. Further, even when the level of the power supply due to wraparound does not lead to the reset operation but is lower than the normal voltage (a level lower than the first reference voltage and higher than the second reference voltage), it is input to the input terminal. Such an abnormal low-level state can be detected based on the voltage signal and can be appropriately handled.

In the invention of claim 6, the signal processing unit (40) of the second control circuit (3) is connected to the input terminal (2 b) at the time of power activation, at the time of entering low power operation, or at the return from low power operation. The voltage signal exceeding the reference voltage (Vth, Vth1) is output, and the corresponding part (13) of the first control circuit (2) is activated when the power supply of the second control circuit (3) is started or low power A predetermined response operation is performed when it is determined by the determination unit (20) that an abnormal state has occurred at the time of operation entry or return from low power operation.
In this way, it is determined that a voltage signal exceeding the reference voltage is output from the second control circuit side at the time of starting the power source, at the time of entering low power operation, or at the return from low power operation, and at this timing, the determination unit If the abnormality determination is performed, the abnormality determination can be performed more reliably and efficiently with an appropriate timing at which the mode is switched as a trigger.

In the invention of claim 7, the signal processing unit (40) of the second control circuit (3) exceeds the reference voltage (Vth, Vth1) with respect to the input terminal (2b) for a certain period after transmitting the predetermined information. A voltage signal is output. The corresponding unit (13) of the first control circuit (2) is configured to be able to detect the predetermined information from the second control circuit (3), and after detecting the predetermined information, the determination unit (20) When it is determined that a state has occurred, a predetermined response operation is performed.
According to this configuration, “the timing at which a signal exceeding the reference voltage is continuously output” can be transmitted from the second control circuit side to the first control circuit side, and the first control circuit side determines in this way. Therefore, it is possible to make an abnormality determination more reliably and efficiently at the determined timing.

FIG. 1 is a circuit diagram schematically illustrating an electronic control apparatus according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram schematically illustrating a circuit configuration for comparing the reference voltage and the input voltage (voltage signal at the input terminal) in the electronic control device of FIG. FIG. 3 is a timing chart showing the relationship among the operation state, possession state, and voltage signal state in the electronic control device of FIG. FIG. 4 is an explanatory diagram schematically illustrating the configuration of a determination unit and the like used in the electronic control device of the second embodiment. FIG. 5 is an explanatory diagram schematically illustrating a configuration of a determination unit and the like used in the electronic control device according to the modified example of the second embodiment. FIG. 6 is an explanatory diagram schematically illustrating a configuration of a determination unit and the like used in the electronic control device of the third embodiment. FIG. 7 shows the relationship between the voltage signal at the normal time (voltage input to the input terminal) and each signal at the window comparator and the voltage signal at the time of abnormality (input to the input terminal) in the electronic control device of the third embodiment. It is explanatory drawing which shows the relationship between each signal in a window comparator and a voltage.

[First embodiment]
Hereinafter, a first embodiment embodying the present invention will be described with reference to the drawings.
The electronic control device 1 shown in FIG. 1 is configured as an in-vehicle ECU or the like. For example, the first control circuit 2 and the second control circuit 3 are arranged on a common board so that they can communicate with each other. Thus, the operating power can be supplied from the first control circuit 2 to the second control circuit 3.

  The first control circuit 2 is configured as an integrated circuit such as an integrated IC, for example, and includes a power supply unit 11, a corresponding unit 13, a communication unit 15, a driver 17, a reset unit 19, a determination unit 20, a buffer unit 25 in the chip. 27 and the like, and is electrically connected to the second control circuit 3 through the power supply line L1 and the signal lines L2, L3, and L4. In addition, a power supply terminal 2a that outputs a voltage based on power from the power supply unit 11, an output terminal 2b that outputs at least a signal to the outside, an input terminal 2c that receives at least a signal from the outside, and a reset unit 19 is provided with a reset terminal 2d from which a reset signal is output. Note that the output terminal 2b and the input terminal 2c may be capable of inputting and outputting signals.

  The second control circuit 3 is configured as a microcomputer, for example, and includes a signal processing unit 40, a protection circuit 42, a low voltage detection unit 46, buffer units 43 and 45, an OR circuit 49, and the like. The second control circuit 3 is supplied with power from the first control circuit 2 side via the power supply line L1 connected to the power supply terminal 2a of the first control circuit 2, and is connected to the output terminal 2b of the first control circuit 2. A signal can be received via the connected signal line L2.

Here, each part of the first control circuit 2 will be described.
The power supply unit 11 is configured as a known power supply circuit, generates a constant voltage for operation (for example, 5 V), and outputs it to the power supply line L1 through the power supply terminal 2a. That is, at the normal time, the power supply line L1 is maintained at a constant voltage generated by the power supply unit 11. The constant voltage for operation is also supplied to each part in the control circuit such as the buffer units 25 and 27 in the first control circuit 2.

  The buffer units 25 and 27 are configured to form an input signal into a signal of a specified level and output it. For example, the buffer unit 25 outputs a signal of the same level as the power supply voltage level (for example, 5 V) of the power supply unit 11 when the corresponding unit 13 outputs an H level signal equal to or higher than a predetermined value. When the output is an L level less than a predetermined value, a signal of a predetermined low voltage level (for example, 0 V) is output. The buffer unit 27 outputs a signal of the power supply voltage level (for example, 5 V) of the power supply unit 11 to the corresponding unit 13 when the level of the signal input via the signal line L3 is an H level that is equal to or higher than a predetermined value. When the level of a signal input via the signal line L3 is an L level that is less than a predetermined value, a signal having a predetermined low voltage level (for example, 0 V) is output to the corresponding unit 13.

  The determination unit 20 includes a reference voltage generation unit 21 that generates a reference voltage Vth (reference potential), and a comparison unit 23. A voltage signal input from the second control circuit 3 through the input terminal 2c is received. Monitor to determine whether or not an abnormal state has occurred in which the voltage signal is below the reference voltage Vth in a time zone where the voltage should exceed the reference voltage Vth, and output an H level signal when the abnormal state occurs. It functions so as to output an L level signal at normal times when no state has occurred. The reference voltage generation unit 21 shown in FIGS. 1 and 2 is configured by a known constant voltage circuit or the like, and is generated by a low voltage generation unit 51 described later, which is lower than the power supply voltage Vb generated by the power supply unit 11. A constant voltage (reference voltage Vth) higher than the low voltage Vth3 is generated and output to the positive terminal of the comparator 23. In particular, the reference voltage Vth generated by the reference voltage generation unit 21 is a voltage value obtained by subtracting the voltage drop (that is, the forward voltage Vf) of the protection diode D1 from the power supply voltage (power supply potential) Vb generated by the power supply unit 11. Vb−Vf).

  The comparison unit 23 includes a known comparator or the like, and a voltage signal (that is, the potential of the signal line L3) input from the second control circuit 3 via the input terminal 2c is input to the negative input terminal. The voltage signal is compared with the reference voltage Vth input to the positive terminal. When the voltage signal input through the input terminal 2c exceeds the reference voltage Vth (for example, about the power supply voltage Vb), an L level signal (normal signal) is output, and the input signal is input through the input terminal 2c. When the input voltage signal is lower than the reference voltage Vth (for example, about Vb−Vf), an H level signal (abnormal signal) is output.

  The correspondence unit 13 is configured as a control circuit that performs arithmetic processing and various control processes. For example, the processing unit 13 is configured to give a communication command or a communication stop command to the communication unit 15. Further, a drive command or a drive stop command is given to the driver 17, and a reset operation command or a reset operation stop command is also given to the reset unit 19. Furthermore, the response unit 13 can detect whether or not an H level signal is output from the comparison unit 23 in the determination unit 20. Then, it is determined whether or not an abnormal signal (H level signal) is output in the time zone in which the L level signal is to be output from the comparison unit 23. When the abnormal signal is confirmed in this time zone, a predetermined corresponding operation is performed. To do. The predetermined corresponding operation will be described later.

  The communication unit 15 is a circuit part that performs communication processing with an external device (not shown). For example, the communication unit 15 can output a diagnosis signal to the outside of the first control circuit 2 in response to a diagnosis command from the processing unit 13. You may be comprised, and it may be comprised so that transmission / reception of data may be performed between external apparatuses according to the communication command from the process part 13. FIG. The driver 17 is a drive circuit portion that drives externally connected components (not shown), and is configured as, for example, a drive driver that drives an actuator. The driver 17 drives an external actuator or stops driving according to the processing of the corresponding unit 13. The reset unit 19 is a circuit part that can output a reset signal to the second control circuit 3, and outputs a reset signal via the signal line L4 when receiving a predetermined reset instruction signal from the corresponding unit 13. It has become.

Next, each part of the second control circuit 3 will be described.
The signal processing unit 40 includes a processing unit 41 configured as a control unit and a buffer unit 45, and both the processing unit 41 and the buffer unit 45 are output from the power supply unit 11 via the power supply terminal 2a. The power supply voltage (that is, the power supply voltage from the power supply line L1) is supplied to operate. The processing unit 41 is a part that can perform various kinds of arithmetic processing and control processing, and is configured to acquire a signal from the signal line L2 through the buffer unit 43 and also through the buffer unit 45. A signal can be output to L3. Further, when a reset signal is input from an OR circuit 49 described later, a predetermined reset operation (initialization operation) is performed.

  The buffer unit 45 is configured to operate in response to the supply voltage from the power supply line L1 and to form and output an input signal from the processing unit 41 into a signal of a specified level, and is input from the processing unit 41. When the voltage level (input potential) is an H level command that is equal to or higher than a predetermined value, a signal (H level signal) having a level similar to a power supply voltage (for example, 5 V) applied to the power supply line L1 is output from the processing unit 41. When the input voltage level (input potential) is an L level command that is less than a predetermined value, a signal of a predetermined low voltage level (for example, 0 V) is output. With this configuration, when the power supply voltage Vb is supplied to the signal processing unit 40 via the power supply terminal 2a and the power supply line L1 (that is, the power supply line L1 is maintained at the power supply voltage (for example, 5V)). When the signal is struck), a voltage signal of about the power supply voltage Vb (for example, 5 V) from the buffer unit 45 to the input terminal 2b of the first control circuit 2 in response to the H level command from the processing unit 41 (that is, the above-mentioned) Voltage signal exceeding the reference voltage Vth) is output, and the potential of the signal line L3 is maintained at the same level as the power supply voltage Vb.

  The buffer unit 43 connected to the signal line L2 through the input terminal 3b operates by receiving the supply voltage from the power supply line L1, and forms and outputs the potential (input signal) of the signal line L2 to a signal of a specified level. Is configured to do. Specifically, when the potential of the signal line L2 is at an H level where the potential is equal to or higher than a predetermined value, a signal having the same level as the power supply voltage Vb (for example, 5 V) applied to the power supply line L1 is output. When the L level is less than the predetermined value, a signal of a predetermined low voltage level (for example, 0 V) is output.

  The protection circuit 42 is configured to allow a current to flow from the signal line L2 side to the power supply line L1 side between the signal line L2 and the power supply line L1. The protection circuit 42 includes a protection diode D1 having an anode connected to the signal line L2 side and a cathode connected to the power supply line L1 side, and a protection diode D2 connected in series to the protection diode D1. These protective diodes D1 and D2 are connected in series between the power supply line L1 and the ground. The protection diode D1 is configured as a forward diode, the anode is connected to the input terminal 3b and the input side of the buffer unit 43, and the cathode is connected to the power supply line L1. The protection diode D <b> 2 is also configured as a forward diode, the anode is connected to the ground, and the cathode is connected to the input terminal 3 b and the input side of the buffer unit 43. In this configuration, when the power supply voltage Vb is supplied from the power supply line L1 to the processing unit 41 in a normal state, if the potential of the signal line L2 is up to a normal potential (for example, about 5 V), the power supply line is connected from the signal line L2 side. When no current flows on the L1 side and the potential of the signal line L2 exceeds a predetermined value (threshold value determined by the sum of the potential of the power supply line L1 and the forward voltage Vf of the protection diode D1), the signal line L2 side Thus, a current is allowed to flow to the power supply line L1 side to release the current, thereby protecting the current.

  The low voltage detection unit 46 functions to detect a low voltage state in which the voltage of the power supply line L1 is less than a predetermined reference low voltage (reference low potential) Vth3. The low voltage detection unit 46 includes a low voltage generation unit 51 that generates a reference low voltage Vth3, and a comparison unit 47 that compares the voltage of the power supply line L1 with the reference low voltage Vth3. The low voltage generation unit 51 is configured as a known constant voltage circuit, and generates a positive constant potential (reference low voltage Vth3) lower than the above-described reference voltage Vth. The level of Vth3 can be, for example, a value obtained by subtracting 2 × Vf from the supply voltage Vb of the power supply unit 11 (that is, Vth3 = Vb−2 × Vf: where Vf is a forward voltage of the protective diode D1 or the like). . The comparison unit 47 outputs an L level signal when the potential of the power supply line L1 is higher than the reference low voltage Vth3, and outputs an H level signal when the potential of the power supply line L1 is lower than the reference low voltage Vth3. Output a signal.

  The OR circuit 49 outputs an H level signal when the H level signal (reset signal) is output from the reset unit 19 in response to a reset command from the processing unit 13 or as a comparison result in the comparison unit 47. Sometimes, an H level signal is given to the processing unit 41.

Next, main control processing in the electronic control device 1 will be described.
As shown in FIG. 3, in this configuration, when the output of the power supply voltage from the power supply unit 11 is started (that is, when the power is turned on in the electronic control unit 1 or in the power saving mode (predetermined power consumption is lower than normal). At the time of return from the sleep mode), an H level command is issued from the signal processing unit 40 of the second control circuit 3 at least for a certain period from the output start timing t1, and during this certain period, H level is applied to the signal line L3. The level signal is continuously applied. On the other hand, the corresponding unit 13 of the first control circuit 2 continues to monitor the signal from the determination unit 20 for the predetermined period with the power supply voltage output start time t1 from the power supply unit 11 as a base point. In this configuration, when the power supply line L1 is not disconnected, the signal line L3 is maintained at the same level as the power supply voltage Vb during the predetermined period, and the L level signal is continuously output from the comparison unit 23. become. The response unit 13 does not perform predetermined response processing (abnormality response processing), which will be described later, when the output from the comparison unit 23 is maintained as an L level signal throughout this time period (the predetermined time).

  On the other hand, when the H level signal is output from the comparison unit 23 in the above-mentioned fixed period (the time period in which the H level command is continuously issued from the signal processing unit 40 of the second control circuit 3) starting from the power supply voltage output start time t1. When the potential of the signal line L3 falls below the reference potential Vth, the handling unit 13 performs a predetermined handling process. That is, the case where the H level signal is output from the comparison unit 23 during the predetermined period (the time period in which the H level command is continuously issued from the signal processing unit 40 of the second control circuit 3), that is, the disconnection in the power supply line L1. Is generated, and there is a high possibility that a sneak current is generated via the signal line L2. In such a case, the corresponding unit 13 performs a predetermined corresponding operation.

  For example, when a disconnection occurs in the power supply line L1 as shown in FIG. 1 (in the example of FIG. 1, the disconnection in the substrate wiring portion (P-plate wiring disconnection), the disconnection of the wire bond wiring, the disconnection in the chip, etc. Conceptually illustrated), when an H level signal (for example, 5V) corresponding to the power supply voltage Vb is output from the buffer unit 25 to the signal line L2, a sneak (through reference symbol Z shown in FIG. 1) via the protection diode D1. And the buffer unit 43 and the processing unit 41 have a voltage (Vb−Vf) lower than the power supply voltage Vb (for example, 5V) by a voltage drop (forward voltage Vf) due to the protection diode D1, or A low voltage close to this is input as the operating voltage. When such a situation (disconnection of the power supply line L1 and current sneak through the signal line L2) occurs, an H level signal output from the signal processing unit 40 to the signal line L3 (that is, H from the buffer unit 45). Since the level signal) has a value of about Vb−Vf lower than the original level (value of about the power supply voltage Vb), it is lower than the reference voltage Vth generated on the first control circuit 2 side. 23 outputs an H level signal. Accordingly, the corresponding unit 13 monitors the output from the comparison unit 23 in a time zone in which the potential of the signal line L3 should exceed the reference potential Vth (that is, the predetermined period from the time t1), and in this time zone, the comparison unit 23 When an H level signal is output from, a predetermined corresponding operation is performed on the assumption that a break has occurred in the power supply line L1.

  Various examples of the corresponding operation by the corresponding unit 13 can be considered. For example, a method in which a predetermined diagnostic command is given from the corresponding unit 13 to the communication unit 15 and a predetermined diagnostic signal is output from the communication unit 15 to the outside. Is mentioned. In this way, it is possible to grasp that the power supply line L1 is disconnected when a predetermined diagnostic signal is output to the outside. Alternatively, a method of giving a communication stop command from the corresponding unit 13 to the communication unit 15 and stopping the communication operation in the communication unit 15 for a certain time or more may be used. In this way, the external device can grasp that the power supply line L1 is disconnected when the communication unit 15 has been unable to communicate for a certain period of time. Alternatively, a corresponding operation may be performed in which a driving stop command is given from the corresponding unit 13 to the driver 17 to stop the driving function of the driver 17 and stop driving of external components (for example, driving of an actuator). Alternatively, the processing unit 41 may be reset by giving a reset command from the corresponding unit 13 to the reset unit 19 and outputting a reset signal from the reset unit 19 to the OR circuit 49 via the signal line L4. Further, such a reset signal may be continued until a predetermined return condition is satisfied. In other words, the reset signal may be continuously output until the return condition is satisfied as the corresponding operation, and the processing unit 41 may be continuously reset and not operated.

Note that the timing at which the signal line L3 is fixed to the H level by the signal processing unit 40 of the second control circuit 3 is not limited to when the power is turned on or when returning from the low power operation. It may be when entering a power operation (when entering a sleep mode). For example, an H level signal is sent from the signal processing unit 40 to the signal line L3 for a certain period starting from a timing at which a predetermined condition for entering the low power operation mode is satisfied (for example, timing at time t4 in FIG. 3). The output unit 13 continues to monitor the signal from the comparison unit 13 during this time period (the predetermined period), and confirms whether or not the H level signal is output from the comparison unit 13. Good. Various known timings can be used as the timing for switching the second control circuit 3 between the normal mode and the low power operation mode.

  In the above-described example, an H level signal is output from the second control circuit 3 side for a certain period at a predetermined time (such as when the power is turned on, when low power operation is entered, when returning from low power operation, etc.). Thus, the signal line L3 is set to the H level for a certain period, and the corresponding unit 13 determines whether or not an abnormal signal is output during this time period (the predetermined period). Is not limited to such an example. For example, the signal processing unit 40 of the second control circuit 3 transmits predetermined information (a predetermined command or the like) to the first control circuit 2 periodically or when the predetermined condition is satisfied, via the signal line L3, and this As described above, the H level signal may be continuously output to the signal line L3 for a certain period from the end of transmission of the predetermined information (for example, the timing at time t3 in FIG. 3). In this case, the corresponding unit 13 of the first control circuit 2 constantly monitors the predetermined information from the signal processing unit 40. When the predetermined information is detected, the corresponding unit 13 from the comparison unit 23 during the predetermined period from the detection time t3. What is necessary is just to confirm whether a level signal is output. Then, when the H level signal is acquired from the comparison unit 23 in the time period (the above-described fixed period), the above-described corresponding operation may be performed.

According to the above configuration, power can be supplied from the first control circuit 2 side to the second control circuit 3 side via the power line L1, and current can be released from the signal line L2 side to the power line L1 side. The circuit protection can be achieved by configuring the circuit as described above.
On the other hand, with this configuration, even if the power supply line L1 is disconnected, a current flows from the signal line L2 side to the power supply line L1 side, and the second control circuit 3 is supplied with power in an abnormally low voltage state. There is concern. When power is supplied in such a low voltage state, the voltage signal input from the second control circuit 3 to the first control circuit 2 is also lower than the voltage exceeding the normal voltage (predetermined voltage). In the configuration shown in 2 or the like, the determination unit 20 determines whether or not an abnormal state in which the input voltage is equal to or lower than the predetermined voltage is generated in this way, and accordingly, the response unit 13 can appropriately cope with it. It becomes. In particular, in this configuration, since it is not necessary to provide an external voltage monitoring circuit outside the first control circuit 2 or the second control circuit 3, it is possible to suppress an increase in the size of the device configuration and to prevent the power supply line L1 from being disconnected. Since there is no need to provide a dedicated signal monitoring terminal for detection, an increase in the number of terminals can be suppressed. Further, in this configuration, in the power supply line L1, a part in the first control circuit 2 or a part in the second control circuit 3 (for example, between the terminal 3a in FIG. 1 and the connection point on the cathode side of the protection diode D1). Even if a disconnection occurs and a sneak path as indicated by a broken line Z occurs from the signal line L2 side to the power supply line L1 side, it is possible to more reliably detect and respond to an abnormal operation caused by the sneak path. .

The determination unit 20 is provided with a comparison unit 23 that compares a voltage signal (the potential of the signal line L3) input from the second control circuit 3 through the input terminal 2c with a predetermined reference voltage Vth. The corresponding unit 13 of the control circuit 2 is input by the comparison unit 23 via the input terminal 2c at a predetermined time when a voltage signal exceeding the reference voltage Vth is to be output from the second control circuit 3 to the input terminal 2c. A predetermined corresponding operation is performed when it is determined that the voltage signal is lower than the reference voltage Vth.
According to such a configuration, a voltage signal that is originally input through the input terminal 2c even though a normal signal (a voltage signal exceeding the reference voltage Vth) is to be input to the input terminal 2c is a predetermined time. Is lower than the reference voltage Vth, that is, a voltage signal output in a low voltage state using a sneak current as indicated by a broken line Z can be reliably detected with a simple configuration. It will be possible to respond appropriately.

In addition, the signal processing unit 40 of the second control circuit 3 has an H level signal that is about the same as the power supply voltage Vb with respect to the input terminal 2b at the time of starting the power supply, entering the low power operation, or returning from the low power operation. (Corresponding to the voltage signal exceeding the reference voltage Vth), the corresponding unit 13 of the first control circuit 2 is activated when the power of the second control circuit 3 is activated, or when low power operation is started, or from low power operation. When the determination unit 20 determines that an abnormal state has occurred (that is, when the H level signal is output from the comparison unit 23), the predetermined response operation is performed.
As described above, it is determined that a voltage signal exceeding the reference voltage Vth is output from the second control circuit 3 side at the time of starting the power source, entering the low power operation, or returning from the low power operation. If the abnormality determination is performed by the unit 20, the abnormality determination can be performed more reliably and efficiently with an appropriate timing at which the mode is switched as a trigger.

As another example, the signal processing unit 40 of the second control circuit 3 has an H level signal (exceeding the reference voltage Vth) comparable to the power supply voltage Vb with respect to the input terminal 2b for a certain period after transmitting the predetermined information. Voltage signal). The corresponding unit 13 of the first control circuit 2 is configured to be able to detect the predetermined information from the second control circuit 3, and determines that an abnormal state has occurred by the determination unit 20 for a certain period after the detection of the predetermined information. If this occurs (that is, when an H level signal is output from the comparison unit 23), a predetermined corresponding operation is performed.
According to this configuration, “the timing at which a signal exceeding the reference voltage Vth continues to be output” can be transmitted from the second control circuit 3 side to the first control circuit 2 side. Thus, abnormality determination can be performed more reliably and efficiently at the determined timing.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIG.
Note that the electronic control device according to the second embodiment is the same as the first embodiment except for the configuration of the reference voltage generation unit 21, and the rest is the same as the first embodiment. Therefore, except for the reference voltage generation unit 21, the description of FIGS. 1 to 3 and the first embodiment is used, and the detailed description is omitted.

  Also in the present embodiment, in the determination unit 20 (FIG. 1), the reference voltage generation unit 21 that generates the reference voltage Vth and the voltage signal input from the second control circuit 3 via the input terminal 2c (the potential of the signal line L3). ) And the reference voltage Vth generated by the reference voltage generation unit 21. Also in the present embodiment, the corresponding unit 13 of the first control circuit 2 causes the second control circuit 3 to output a voltage signal exceeding the reference voltage Vth to the input terminal 2c (time shown in FIG. 3). When the comparison unit 23 determines that the voltage signal input via the input terminal 2c is lower than the reference voltage Vth in a certain period after t1, a certain period after time t3, or the like (that is, the comparison unit 23). When the H level signal is output from the first), the same “predetermined corresponding operation” as in the first embodiment is performed.

  Further, the protection diode D1 used in the protection circuit 42 has a characteristic that the resistance value decreases as the temperature rises, and the resistance value increases as the temperature decreases, and the processing caused by the sneak current as the temperature decreases. The applied voltage to the unit 41 and the buffer unit 45 decreases, and the applied voltage to the processing unit 41 and the buffer unit 45 caused by the sneak current increases as the temperature increases. That is, when the power supply line L1 is disconnected and a sneak current is generated from the signal line L2 to the processing unit 41 or the buffer unit 45, the signal line when the H level signal is output from the second control circuit 3 to the signal line L3. Is lower than the power supply voltage Vb, and in that range, the potential decreases as the temperature decreases, and increases as the temperature increases. Therefore, in the present embodiment, the reference voltage generation unit 21 is configured to generate a higher reference voltage Vth as the temperature rises. The reference voltage generation unit 21 is configured as shown in FIG. 4, for example, and a resistor R1, a transistor Tr2, and a resistor R1 are connected in series between the power supply unit 11 and the ground, and in parallel therewith, A resistor R3 and a transistor Tr1 are connected. The resistor R2 has one end connected to the power supply unit 11 and the other end connected to the collector of the transistor Tr2 and the positive terminal of the comparison unit 23. The transistor Tr2 has a base connected to the resistor R3 and the collector of the transistor, and an emitter connected to one end of the resistor R1 and the base of the transistor. The resistor R1 has one end connected to the emitter of the transistor Tr2 and the base of the transistor Tr1, and the other end grounded. In this configuration, the potential between the resistor R2, the collector of the transistor Tr2, and the resistor R2 is taken out as the reference voltage Vth and input to the positive terminal of the comparison unit 23. In this configuration, the transistor of the reference voltage generation unit 21 has a Vf temperature characteristic similar to the forward voltage Vf of the protection diode D1, and the reference voltage Vth increases as the temperature increases, and the reference voltage decreases as the temperature decreases.

  Further, the reference voltage generation unit 21 is not limited to the configuration as illustrated in FIG. 4, and may be configured as illustrated in FIG. 5, for example. In the configuration of FIG. 5, resistors R5, R6, and R7 are connected in series between the power supply unit 11 and the ground, and a diode D3 is connected in parallel with the resistors R5 and R6. The potential between the resistor R5 and the resistor R6 is inputted to the positive input terminal of the comparison unit 23 as the reference voltage Vth. In this configuration, the forward voltage Vf of the diode D3 of the reference voltage generator 21 has the same temperature characteristics as the forward voltage Vf of the protection diode D1, and the resistance value of the diode D3 increases as the temperature decreases, and the resistors R5, R6 Since the current flowing through the capacitor increases, the reference voltage Vth decreases. Conversely, the reference voltage Vth increases as the temperature increases.

  According to this configuration as described above, current can be released via the protective diode D1 when a sudden voltage fluctuation or the like occurs on the signal line L2 side. On the other hand, even in this configuration, when the power supply line L1 is disconnected, a current flows from the signal line L2 side to the power supply line L1 side via the protection diode D1, and thus power is supplied. The power supply voltage at that time has a value corresponding to the voltage drop at the protection diode D1. That is, since the resistance value of the protection diode D1 decreases as the temperature rises, the power supply voltage due to the wraparound increases, and the voltage signal resulting from this voltage (the voltage input to the first control circuit via the input terminal) Signal) also increases as the temperature rises. In this configuration, paying attention to such characteristics, the reference voltage generator 21 generates the reference voltage Vth so as to increase as the temperature rises. Therefore, the resistance value of the protection diode D1 varies due to the temperature change. Minutes can be easily canceled, and more appropriate threshold setting, and more appropriate abnormality monitoring can be performed.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIGS.
Note that the third embodiment is different from the first embodiment only in the configuration of the determination unit 20, and otherwise, the description of FIGS. 1 to 3 and the first embodiment can be used. In this configuration, a determination unit 20 (a determination unit including a reference voltage generation unit 75 and a comparison unit 70) as illustrated in FIG. 6 is used instead of the determination unit 20 illustrated in FIG.

  The determination unit 20 used in the third embodiment receives a reference voltage generation unit 75 that generates two reference voltages Vth1 and Vth2, and a voltage signal input through the input terminal 2c (that is, the potential of the signal line L3). A comparison unit 70 is provided for comparing with each of the reference voltages Vth1 and Vth2. The reference voltage generation unit 75 is configured as a known constant voltage circuit, and a first constant voltage (first reference voltage Vth1) lower than the power supply voltage Vb (for example, 5V) and the first constant voltage. A low second constant voltage (second reference voltage Vth2) is generated. The first reference voltage Vth1 is lower than the power supply voltage Vb generated by the power supply unit 11 (FIG. 1), and is a value obtained by subtracting the voltage drop (forward voltage Vf) at the protection diode D1 from the power supply voltage Vb (Vb−Vf). ), For example, a value of about Vb−Vf × ½. The second reference voltage Vth2 is set to a value that is lower than the value (Vb−Vf) obtained by subtracting the voltage drop (forward voltage Vf) at the protection diode D1 from the power supply voltage Vb, and is somewhat higher than 0V. Specifically, it is set to a value that is about the same as or lower than the reference low voltage Vth3 generated by the low voltage detection unit 46, for example, about Vb-2 × Vf.

  Even in this configuration, the signal processing unit 40 is configured in the same manner as in the first embodiment. When the power supply line L1 is not disconnected, the signal processing unit 40 is more than the first reference voltage Vth1 from the buffer unit 45 to the input terminal 2c. A high first signal (specifically, an H level signal comparable to the power supply voltage Vb) and a second signal lower than the second reference voltage Vth2 (specifically, an L level signal of 0 V) are switched and output. Is configured to do.

  On the other hand, the comparison unit 70 is configured as a window comparator, and the voltage signal input through the input terminal 2c (that is, the potential of the signal line L3) is less than the first reference voltage Vth1 and the second reference voltage Vth2 is set. If it exceeds, an H level signal is output and it is determined that there is an abnormality. On the other hand, when the voltage signal input through the input terminal 2c (ie, the potential of the signal line L3) is equal to or higher than the first reference voltage Vth1, or the voltage signal input through the input terminal 2c (ie, the potential of the signal line L3). ) Is equal to or lower than the second reference voltage Vth2, an L level signal is output and it is determined to be normal.

  In this configuration, when normal, the signal processing unit 40 sends an H level signal (first signal higher than the first reference voltage Vth1) and an L level signal (lower than the second reference voltage Vth2) to the first control circuit 2. 2 signals) can be switched and output for signal transmission. Further, even if the power supply line L1 is disconnected and a current flows from the signal line L2 side to the power supply line L1 side, and the second control circuit 3 operates at a low operating voltage, it is output during such operation. A low output voltage (a voltage signal lower than the first reference voltage Vth1 and higher than the second reference voltage Vth2) can be detected by the comparison unit 70, and an abnormal operation can be more reliably performed without using complicated control. Can be detected. In particular, when an H level signal is output from the comparison unit 70, it can be estimated that a disconnection abnormality has occurred regardless of the output timing, and therefore control is performed such that the signal line L3 is fixed at the H level only for abnormality determination. You do n’t have to.

  Also in this configuration, similarly to FIG. 1, in the second control circuit 3, the low voltage detection unit 46 that detects a low voltage state in which the voltage of the power supply line L <b> 1 is less than the predetermined low voltage Vth <b> 3, and the low voltage detection unit 46. And a processing unit 41 that performs a reset operation of the second control circuit 3 when a low voltage state is detected. The second reference voltage Vth2 generated by the reference voltage generation unit 75 is set to a value that is approximately the same as the low voltage Vth3 or lower than a predetermined low voltage. In this configuration, when the level of the power supply due to the wraparound is a considerably low level that is lower than the second reference voltage Vth3, the reset operation can be automatically performed in the second control circuit 3, and the failure at this power supply level can be prevented. Normal operation is suppressed. Further, even when the level of the power supply by the wraparound is a level less than the first reference voltage Vth1 and exceeds the second reference voltage Vth2, this is based on the voltage signal (the potential of the signal line L3) input to the input terminal 2c. Since such an abnormal low level state can be detected, for example, even when the supply voltage due to the wraparound does not reach the reset operation, the abnormality is detected even when the level is lower than the normal voltage Vb. Thus, the corresponding unit 13 can appropriately handle the problem.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  In the above embodiment, the power supply unit 11 is provided in the first control circuit 2 and the power supply voltage is supplied from the first control circuit 2 side to the second control circuit 3 side. A power supply unit similar to the power supply unit 11 may be provided outside, and a power supply voltage may be supplied from the power supply unit to the first control circuit 2. Even in this case, a power supply line is provided so as to connect the first control circuit 2 and the second control circuit 3 with the same configuration as in the above embodiment, and the power supply voltage supplied from the power supply unit to the first control circuit 2 is supplied to this power supply. What is necessary is just to comprise so that it may supply also to the 2nd control circuit 3 side via a line.

DESCRIPTION OF SYMBOLS 1 ... Electronic control apparatus 2 ... 1st control circuit 2a ... Power supply terminal 2b ... Output terminal 2c ... Input terminal 3 ... 2nd control circuit 11 ... Power supply part 13 ... Corresponding part 23 ... Judgment part 40 ... Signal processing part 42 ... Protection circuit L1 ... Power line L2 ... Signal line

Claims (7)

A power supply terminal (2a) that outputs a voltage based on electric power from a power supply unit (11) provided inside or outside the circuit, an output terminal (2b) that outputs a signal at least to the outside, and at least from the outside A first control circuit (2) having an input terminal (2c) to which a signal of
The first control circuit (2) is supplied with power from the first control circuit (2) via a power supply line (L1) connected to the power supply terminal (2a) of the first control circuit (2), and the first control circuit (2 A second control circuit (3) capable of receiving a signal via a signal line (L2) connected to the output terminal (2b) of
With
A protection circuit capable of passing a current from the signal line (L1) side to the power supply line (L2) side between the signal line (L2) connected to the output terminal (2b) and the power supply line (L1). (42) is provided,
The second control circuit (3) operates based on power supply from the power supply line (L1) and receives power supply from the power supply terminal (2a) via the power supply line (L1). A signal processing unit (40) capable of outputting a voltage signal exceeding a reference voltage to the input terminal (2b) of the first control circuit (2) is sometimes provided,
The first control circuit (2)
A determination unit (20) that determines whether or not an abnormal state has occurred in which a voltage signal input from the second control circuit (3) through the input terminal (2c) is equal to or lower than the reference voltage (Vth, Vth1). )When,
A response unit (13) that performs a predetermined response operation when the determination unit (20) determines that the abnormal state has occurred;
An electronic control device (1) characterized by comprising: The determination unit (20) includes a comparison unit (23) that compares a voltage signal input from the second control circuit (3) via the input terminal (2c) with a predetermined reference voltage (Vth). And
The corresponding part (13) of the first control circuit (2) should output a voltage signal exceeding the reference voltage (Vth) from the second control circuit (3) to the input terminal (2c). When the comparison unit (23) determines that the voltage signal input via the input terminal (2c) is lower than the reference voltage (Vth) at a predetermined time, the predetermined corresponding operation is performed. Electronic control device (1) according to claim 1, characterized in that. The protection circuit (42) includes a protection diode (D1) having an anode connected to the signal line (L2) side and a cathode connected to the power supply line (L1) side,
The determination unit (20) includes a reference voltage generation unit (21) that generates a reference voltage (Vth), a voltage signal input from the second control circuit (3) via the input terminal (2c), and the A comparison unit (23) that compares the reference voltage (Vth) generated by a reference voltage generation unit (21);
The protective diode (D1) has a characteristic that the resistance value decreases as the temperature rises.
The electronic control device (1) according to claim 1 or 2, wherein the reference voltage generation unit (21) generates the reference voltage (Vth) so as to increase in accordance with a temperature rise. The determination unit (20) compares a voltage signal input from the second control circuit (3) via the input terminal (2c) with a first reference voltage (Vth1) as the reference voltage, A comparison unit (70) for comparing with a second reference voltage (Vth2) lower than the first reference voltage (Vth1);
The signal processing unit (40) includes a first signal that is higher than the first reference voltage (Vth1) with respect to the input terminal (2c) when the power supply line (L1) is not disconnected. It is configured to switch and output a second signal lower than the second reference voltage (Vth2),
The corresponding unit (13) of the first control circuit (2) is configured to supply a voltage signal equal to or higher than the first reference voltage (Vth1) from the second control circuit (3) to the input terminal (2c) or the first control circuit (2). The voltage signal input via the input terminal (2c) by the comparator (70) at a predetermined time when a voltage signal equal to or lower than 2 reference voltage (Vth2) is to be output is the first reference voltage (Vth1). The electronic control device (1) according to claim 1 , wherein the predetermined corresponding operation is performed when it is determined that the second reference voltage (Vth2) is exceeded and the second reference voltage (Vth2) is exceeded. The second control circuit (3)
A low voltage detector (46) for detecting a low voltage state in which the voltage of the power supply line is less than a predetermined low voltage (Vth3);
A processing unit (41) for performing a reset operation of the second control circuit (3) when the low voltage state is detected by the low voltage detection unit (46);
With
5. The electron according to claim 4, wherein the second reference voltage (Vth2) is set to a value approximately equal to the predetermined low voltage (Vth3) or a value lower than the predetermined low voltage. Control device (1). The signal processing unit (40) of the second control circuit (3) is configured such that the reference voltage is applied to the input terminal (2b) at the time of power activation, at the time of entering low power operation, or at the return from low power operation. Configured to output a voltage signal exceeding (Vth, Vth1),
The corresponding unit (13) of the first control circuit (2) is configured to detect the determination unit (3) when the power source of the second control circuit (3) is turned on, at the time of low power operation entry, or at the return from low power operation. The electronic control device (1) according to any one of claims 1 to 5, wherein the predetermined corresponding operation is performed when it is determined by (20) that the abnormal state has occurred. The signal processing unit (40) of the second control circuit (3) outputs a voltage signal exceeding the reference voltage (Vth, Vth1) to the input terminal (2b) for a certain period after transmitting predetermined information. Configured to output,
The corresponding unit (13) of the first control circuit (2) is configured to be able to detect the predetermined information from the second control circuit (3), and after detecting the predetermined information, the determining unit (20) The electronic control device (1) according to any one of claims 1 to 5, wherein the predetermined corresponding operation is performed when it is determined that the abnormal state has occurred.

Images