JP2019217844A - Control apparatus and control method for the same - Google Patents

Abstract

To provide a control apparatus capable of detecting the occurrence of battery clearing in a main controller comprising a nonvolatile memory, and a control method for the same.SOLUTION: A control apparatus according to one aspect of an embodiment comprises a main controller with a nonvolatile memory, and a sub-controller to which electric power is constantly supplied from a battery. Additionally, the sub-controller comprises a battery clearing detection part and a transmission part. The battery clearing detection part detects the occurrence of battery clearing that indicates that the battery is electrically attached/detached. The transmission part transmits a battery clearing signal, which indicates the occurrence of the battery clearing detected by the battery clearing detection part, to the main controller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device and a control method of the control device.

  2. Description of the Related Art Conventionally, for example, a vehicle such as a hybrid vehicle or an electric vehicle includes a battery that supplies power to an electric motor serving as a power source, and a control device that monitors a state of the battery is known (for example, Patent Document 1). reference).

  In the above-described control device, for example, the occurrence of battery clear indicating that the battery has been electrically attached / detached due to battery replacement or the like is detected. For example, in the above-described related art, when the control device includes a volatile memory and the data stored in the volatile memory is lost due to the removal of the battery and no power being supplied, the occurrence of the battery clear is determined. Detected.

JP 2014-146494 A

  By the way, the above-mentioned control device may include, for example, a main control device (main microcomputer) and a sub-control device (sub-microcomputer). Further, in order to reduce power consumption, when the ignition switch is turned off, for example, when the vehicle is stopped, power is supplied only to the sub control device, and power supply to the main control device may be cut off. In such a case, the main control device is configured to include a nonvolatile memory so that data is not lost when power supply is cut off.

  However, if the main control device is configured as described above, the data stored in the non-volatile memory will not be lost even when power is not supplied due to the attachment / detachment of the battery, so that the occurrence of battery clear may not be detected.

  The present invention has been made in view of the above, and an object of the present invention is to provide a control device and a control method of the control device capable of detecting occurrence of battery clear in a main control device including a nonvolatile memory. .

  In order to solve the above problems and achieve the object, the present invention provides a control device including a main control device having a nonvolatile memory, and a sub control device to which power is constantly supplied from a battery. Further, the sub control device includes a battery clear detection unit and a transmission unit. The battery clear detection unit detects occurrence of a battery clear indicating that the battery has been electrically detached. The transmission unit transmits a battery clear signal indicating occurrence of battery clear detected by the battery clear detection unit to the main control device.

  According to the present invention, it is possible to detect occurrence of battery clear in a main control device including a nonvolatile memory.

FIG. 1 is a diagram illustrating an outline of a control method according to the embodiment. FIG. 2 is a block diagram illustrating a configuration example of a vehicle-mounted system including a control device. FIG. 3 is a timing chart of a control method performed by the control device. FIG. 4 is a timing chart of a control method performed by the control device. FIG. 5 is a flowchart illustrating a processing procedure executed by the sub control device. FIG. 6 is a flowchart illustrating a processing procedure executed by the main control device.

  Hereinafter, embodiments of a control device and a control method of the control device disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited by the embodiments described below.

<1. Overview of control method by controller>
Hereinafter, first, an outline of a control method by the control device according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an outline of a control method according to the embodiment.

  The control method according to the embodiment is executed by, for example, the control device 1. The control device 1 is mounted on a vehicle such as a hybrid electric vehicle (HEV), an electric vehicle (EV), and a fuel cell vehicle (FCV) (not shown).

  The control device 1 includes a main control device 10 and a sub-control device 40. The main controller 10 and the sub controller 40 are supplied with electric power from the battery 100. The battery 100 is different from the large-capacity battery 120 (see FIG. 2) that supplies power to the electric motor 140 (see FIG. 2) described later. For example, the battery 100 is a lead storage battery or the like, and is configured to have a smaller capacity than the large capacity battery 120.

  The main control device 10 causes, for example, a power supply monitoring device 110 (see FIG. 2), which will be described later, to execute a process of monitoring the state of charge of the large-capacity battery 120 or equalizes the voltage of the battery cells of the large-capacity battery 120 Or the like can be executed. In addition, the sub-control device 40 can execute, for example, a process of measuring time used for a process of monitoring the large-capacity battery 120.

  Main controller 10 has a higher processing capacity and a larger power consumption than sub controller 40. Therefore, in the control device 1 according to the present embodiment, for example, when the ignition switch is turned off such as when the vehicle is stopped, power is supplied only to the sub-control device 40, and the power to the main control device 10 is The supply is cut off. That is, power is always supplied from the battery 100 to the sub-control device 40, and power is not always supplied to the main control device 10. Thus, power consumption of the control device 1 can be reduced.

  The main control device 10 includes a non-volatile memory 32, and the sub control device 40 includes a volatile memory 61. Thereby, main controller 10 can prevent data from being lost even when the power supply is cut off when the ignition switch is turned off.

  Note that, even when the ignition switch is turned off, the sub-control device 40 can be activated by transmitting a start instruction to the main control device 10 when processing by the main control device 10 is necessary.

  By the way, if the main control device 10 is configured to include the nonvolatile memory 32, the data stored in the nonvolatile memory 32 will not be lost, for example, when the battery 100 is electrically connected or detached due to replacement of the battery 100 or the like. It will be. Therefore, main controller 10 may not be able to detect the occurrence of “battery clear” indicating that battery 100 has been electrically detached.

  Therefore, in the control device 1 according to the present embodiment, the following control is performed. Specifically, it is assumed that the battery 100 is first detached by a worker or a work robot (not shown) (step S1). Here, the attachment / detachment of the battery 100 means, for example, that the battery 100 is reconnected after being removed. The battery 100 to be reconnected may be the same as or different from the removed battery 100.

  Then, in the control device 1 according to the present embodiment, the sub control device 40 detects occurrence of battery clear (step S2). For example, when data stored in the volatile memory 61 included in the sub-controller 40 is lost (damaged), the sub-controller 40 detects occurrence of battery clear.

  Next, the sub control device 40 transmits a battery clear signal indicating occurrence of battery clear to the main control device 10 (step S3).

  As described above, even when the main control device 10 is configured to include the nonvolatile memory 32, the occurrence of battery clear can be detected because the battery clear signal is transmitted from the sub control device 40.

<2. Configuration of in-vehicle system equipped with control device>
Next, the configuration of the vehicle-mounted system 2 including the control device 1 according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration example of the in-vehicle system 2 including the control device 1. In the block diagram of FIG. 2, components necessary for explaining the features of the present embodiment are mainly represented by functional blocks, and some of the general components are omitted.

  In other words, each component illustrated in the block diagram of FIG. 2 is a functional concept 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 illustrated one, and all or a part of the functional blocks may be functionally or physically distributed in arbitrary units according to various loads and usage conditions. -It is possible to integrate and configure.

  As shown in FIG. 2, the in-vehicle system 2 includes the above-described control device 1, battery 100, power supply monitoring device 110, large-capacity battery 120, power converter 130, electric motor 140, and vehicle control device 150. , An ignition switch 160 (hereinafter sometimes referred to as “IG switch 160”).

  Battery 100 supplies power to control device 1. Further, the battery 100 is configured to be detachable at the time of battery replacement or the like.

  The power monitoring device 110 can monitor the state of the large capacity battery 120. For example, the power supply monitoring device 110 can execute a monitoring process for monitoring the state of charge of the large-capacity battery 120 and the like, and can execute an equalizing process for equalizing the voltage of the battery cells of the large-capacity battery 120.

  Large-capacity battery 120 supplies electric power to electric motor 140 via power converter 130. Note that, as the large capacity battery 120, for example, a lithium ion secondary battery, a nickel hydride secondary battery, or the like can be used, but the present invention is not limited to this. Although not shown, the large capacity battery 120 is, for example, an assembled battery formed by connecting a plurality of battery stacks in series. The battery stack is configured by, for example, connecting a plurality of battery cells in series. The electric motor 140 is a power source of the vehicle, and for example, an electric motor can be used.

  The vehicle control device 150 controls the vehicle by charging / discharging the large capacity battery 120 according to, for example, the state of charge of the large capacity battery 120 notified from the power supply monitoring device 110. For example, vehicle control device 150 causes power converter 130 to convert the voltage charged in large-capacity battery 120 from DC to AC, and supplies the converted voltage to motor 140 to drive motor 140. As a result, the large capacity battery 120 is discharged.

  Further, vehicle control device 150 causes power converter 130 to convert a voltage generated by regenerative braking of electric motor 140 from an AC to a DC voltage, and supplies the voltage to large-capacity battery 120. As a result, the large capacity battery 120 is charged.

  The IG switch 160 is a start switch of the vehicle. The IG switch 160 outputs a signal (ON signal) indicating a vehicle start instruction to the control device 1 according to, for example, a driver's operation.

  The control device 1 includes the main control device 10 and the sub-control device 40 as described above. The main control device 10 and the sub-control device 40 are connected via a communication line 70. The communication line 70 includes, for example, an uplink UP communication line 70U and a downlink DN communication line 70D, and communicably connects the main control device 10 and the sub control device 40. Further, for example, the UP communication line 70U and the DN communication line 70D are communication lines (so-called direct lines) that directly connect the main control device 10 and the sub-control devices 40 in a one-to-one manner.

  Specifically, main controller 10 has an output port 11 and an input port 12, and sub controller 40 has an output port 41 and an input port 42. The output port 11 of the main control device 10 and the input port 42 of the sub control device 40 are connected by a DN communication line 70D, while the input port 12 of the main control device 10 and the output port 41 of the sub control device 40 are connected. By being connected by the UP communication line 70U, the main control device 10 and the sub control device 40 can communicate with each other.

  In the communication on the communication line 70, for example, when a signal is sent from the sub control device 40 to the main control device 10, a predetermined state is set for the UP communication line 70U by the sub control device 40. The predetermined state is, for example, a logic level setting, for example, a voltage of 0 V / 3.3 V. Thereby, main controller 10 can read the signal from sub controller 40 only by acquiring the state (here, the voltage value) of UP communication line 70U, and the processing load of signal reading in main controller 10 is increased. And the response time can be reduced.

  In the above description, the voltage value has been described as an example of the state of the UP communication line 70U set by the sub-control device 40. However, the present invention is not limited to this. For example, an AC signal having a different frequency may be used. The communication line 70 itself does not need to be electrically connected directly. For example, a level shifter for compensating for a difference in logic level, various conversion circuits, optical connection means such as a photocoupler, and magnetic connection using a transformer or the like. You may comprise so that it may be through a means.

  In the above description, the main control device 10 and the sub control device 40 are connected by a direct line, that is, a communication protocol that has a very low level but a small processing load and a short response time. However, the present invention is not limited to this. In other words, the main control device 10 and the sub-control device 40 communicate with each other, for example, a higher-level communication protocol between the control unit 20 of the main control device 10 and the control unit 50 of the sub-control device 40, which will be described later. Communication such as serial communication with various signal changes, communication between CPUs such as SPI (Serial Peripheral Interface) and I2C (Inter-Integrated Circuit) sharing communication lines with multiple CPUs, and CAN (Controller Area Network) and wireless devices Up to the level of inter-communication, the connection may be made communicable by other methods and protocols as needed.

  Main controller 10 includes control unit 20 and storage unit 30. In the following, the control unit 20 of the main control device 10 may be referred to as “main control unit 20” in order to distinguish it from the control unit 50 of the sub-control device 40 described below.

  The main control unit 20 is a microcomputer including an acquisition unit 21 and a main processing unit 22 and having a CPU (Central Processing Unit) and the like. Note that the main processing unit 22 is an example of a processing unit.

  The storage unit 30 is a storage device including a first volatile memory 31 and a nonvolatile memory 32. The first volatile memory 31 may be an SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory), but is not limited thereto. As the nonvolatile memory 32, for example, a data flash or the like can be used, but it is not limited to this.

  The first predetermined data 31a is stored in the first volatile memory 31, while the second predetermined data 32a is stored in the non-volatile memory 32. The first and second predetermined data 31a and 32a have different contents from each other. For example, each of the first and second predetermined data 31a and 32a includes, for example, various types of processing (monitoring processing of the large capacity battery 120 in the power supply monitoring apparatus 110, equalization processing, etc. ) Includes data used for execution control. Since the first predetermined data 31a is stored in the first volatile memory 31, it is assumed that the first predetermined data 31a includes, for example, data that disappears when the IG switch 160 is turned off and power supply is cut off. .

  The obtaining unit 21 can obtain a battery clear signal transmitted from a sub-control device 40 described later. Then, the acquisition unit 21 notifies the main processing unit 22 that the battery clear signal has been transmitted.

  The main processing unit 22 performs a process for causing the power supply monitoring device 110 to execute the monitoring process and the equalization process of the large capacity battery 120 described above. Further, when notified that the battery clear signal has been transmitted by the acquisition unit 21, the main processing unit 22 can execute a predetermined process accompanying the battery clear. Hereinafter, such predetermined processing may be referred to as “battery clear processing”.

  In the battery clearing process, for example, a process of erasing data (such as abnormal data) from the nonvolatile memory 32 that may affect other processes if remaining in the nonvolatile memory 32 after the battery is cleared, or initialization at the time of battery clearing Data initialization processing is performed, but these are only examples and are not limited.

  The sub-control device 40 includes a control unit 50 and a storage unit 60. In the following, the control unit 50 of the sub control device 40 may be referred to as “sub control unit 50” in order to distinguish it from the main control unit 20 of the main control device 10.

  The sub control unit 50 is a microcomputer that includes an acquisition unit 51, a battery clear detection unit 52, a start determination unit 53, a transmission unit 54, and a sub processing unit 55, and includes a CPU and the like.

  The storage unit 60 is a storage device including the second volatile memory 61. In addition, as the second volatile memory 61, an SRAM, a DRAM, or the like can be used, but is not limited thereto. Further, the second volatile memory 61 corresponds to the volatile memory 61 shown in FIG.

  The second volatile memory 61 stores third predetermined data 61a and boot history data 61b. The third predetermined data 61a includes, for example, data used by the sub-control device 40 to execute various processes (such as a process of measuring time used for monitoring the battery 100).

  The boot history data 61b is data indicating a boot history of the main control device 10. For example, the start history data 61b is data indicating that there is a start history when the main control device 10 is started by first outputting a start instruction to the main control device 10 after the occurrence of the battery clear.

  As described above, since the sub-control device 40 is constantly supplied with power even when the IG switch 160 is turned off, the third predetermined data 61a stored in the second volatile memory 61 and the start-up The history data 61b does not disappear. However, when the battery 100 is removed, for example, the power is not supplied to the sub-control device 40, so that the third predetermined data 61a and the activation history data 61b are lost.

  The acquisition unit 51 can acquire information indicating a state of data stored in the second volatile memory 61. For example, the acquisition unit 51 accesses the second volatile memory 61 and acquires information indicating whether the third predetermined data 61a is in a predetermined state or in a state different from the predetermined state.

  Here, in the present specification, "data is in a predetermined state" means that data is in a normal state without data loss, and "data is in a state different from the predetermined state" , A state in which data has been lost, and more specifically, a state in which data has been lost due to no power supply.

  When the third predetermined data 61a stored in the second volatile memory 61 is in a state different from the predetermined state, that is, when the third predetermined data 61a has disappeared, the acquisition unit 51 determines whether the third predetermined data 61a has been lost. Is notified to the battery clear detection unit 52.

  That is, the acquisition unit 51 determines whether or not the third predetermined data 61a stored in the second volatile memory 61 is in an intended state (disappeared state) before and after unintended power shutdown. it can. Specifically, for example, when the battery 100 is attached and the sub-control device 40 starts, it is first checked whether the third predetermined data 61a is an intended value, and then the intended value is written.

  When the data has been lost due to the attachment / detachment of the battery 100, the third predetermined data 61a confirmed by the acquisition unit 51 is different from the intended value written at the time of the previous activation. Therefore, the acquisition unit 51 can confirm whether the data is in the predetermined state, that is, whether the data has been lost, that is, whether the battery has been cleared. Further, in the second volatile memory 61, a hash value such as a checksum or a CRC (Cyclic Redundancy Check) may be recorded in an area where the third predetermined data 61a is written. Accordingly, the acquisition unit 51 can confirm whether the third predetermined data 61a is in an intended state by confirming the hash value at the time of startup. Note that the determination of the disappearance of the third predetermined data 61a in the acquisition unit 51 is not limited to the above, and another determination method may be used.

  The battery clear detection unit 52 detects the occurrence of battery clear when the above-described notification is made from the acquisition unit 51. That is, when the third predetermined data 61a stored in the second volatile memory 61 is in a state different from the predetermined state, the battery clear detection unit 52 detects the occurrence of battery clear. Thereby, the battery clear detection unit 52 can reliably detect that the battery 100 has been electrically detached and the battery has been cleared.

  Then, battery clear detection section 52 notifies transmission section 54 that the occurrence of battery clear has been detected. In the above description, when the third predetermined data 61a of the second volatile memory 61 has disappeared, the battery clear detection unit 52 detects the occurrence of the battery clear, but is not limited thereto. That is, for example, the battery clear detection unit 52 may always detect the voltage of the battery 100, and may detect the occurrence of the battery clear when the battery 100 is electrically connected / detached and the voltage decreases.

  The activation determination unit 53 determines whether or not the main control device 10 has been activated after the occurrence of the battery clear. For example, the start determination unit 53 accesses the start history data 61b of the second volatile memory 61, and when the start history data 61b includes data indicating that there is a start history, the main control device 10 Is determined to have been activated. On the other hand, when the start history data 61b does not include data indicating that there is a start history, the start determination unit 53 determines that the main control device 10 has not been started after the occurrence of the battery clear. Then, the activation determining unit 53 notifies the transmitting unit 54 of the determination result.

  The transmitting unit 54 can transmit a battery clear signal indicating the occurrence of battery clear to the main control device 10. For example, when the transmission section 54 is notified that the battery clear has been detected from the battery clear detection section 52 at the timing when the IG switch 160 is turned on or the battery 100 is reconnected, the transmission section 54 transmits a battery clear signal. It can be transmitted to main controller 10. As described above, main controller 10 can detect occurrence of battery clear even in a configuration including nonvolatile memory 32.

  Further, transmitting section 54 may transmit a battery clear signal according to the determination result notified from activation determining section 53. For example, when the transmission determination unit 54 determines that the main control device 10 has not been activated by the activation determination unit 53, the main control device 10 presumes that the battery clear processing has not been executed yet. Send a clear signal.

  On the other hand, when the transmission determination unit 54 determines that the main control device 10 has been activated by the activation determination unit 53, the main control device 10 side presumes that the battery clear process has been performed at the time of the previous activation. Stop transmitting the battery clear signal.

  Thereby, it is possible to prevent the sub-control device 40 from transmitting a battery clear signal to the main control device 10 even though the main control device 10 is executing the battery clear process.

  The transmitting unit 54 transmits a battery clear signal to the main control device 10 via an UP communication line (direct line) 70U that directly connects the sub control device 40 and the main control device 10. For example, transmitting section 54 transmits a battery clear signal to main controller 10 by setting UP communication line 70U to a predetermined state (for example, a voltage value indicating transmission of a battery clear signal). Accordingly, the transmission unit 54 can perform a process of transmitting a battery clear signal when a battery clear occurs, so that the process is less likely to be delayed than in the case where, for example, communication between CPUs is used. A clear signal can be transmitted to main controller 10.

  The sub-processing unit 55 can execute various processes such as a process of measuring time used for the above-described monitoring process of the large-capacity battery 120, and can execute a process of transmitting a start instruction to the main control device 10.

  For example, when the IG switch 160 is turned on, the sub-processing unit 55 transmits a start instruction to the main control device 10. At this time, the sub-processing unit 55 may transmit the activation instruction after the battery clear signal is transmitted. As a result, when the main control device 10 is activated by the activation instruction, the battery clear signal has already been transmitted, so that it is possible to reliably execute the battery clear processing and the like.

  In addition, when the IG switch 160 is turned off, the sub-processing unit 55 may execute a process associated with the IG switch 160 being turned off, and then shift to a sleep state in which at least a part of the process is stopped. In the sleep state, for example, transmission of the above-described battery clear signal is stopped.

  Further, even when the IG switch 160 is turned off, for example, the sub-processing unit 55 transmits a start instruction to the main control device 10 when processing by the main control device 10 such as equalization processing is required. May be activated. Note that the transmission of the activation instruction to the main control device 10 by the sub-processing unit 55 may be a regular timing or an arbitrary timing that is irregular.

  Here, the main processing unit 22 to which the start instruction is transmitted will be described. As described above, when the IG switch 160 is turned on and the activation instruction is transmitted from the sub-processing unit 55, the main processing unit 22 executes the activation process and activates. At this time, for example, when a battery clear signal is also transmitted from the sub control device 40, the main processing unit 22 executes the battery clear process as described above.

  When the IG switch 160 is turned off, the main processing unit 22 performs a termination process. When the termination process is completed, a power supply to the main control device 10 is shut off by controlling a relay (not shown) and the like. The control of the relay and the like may be performed by either the main processing unit 22 or the sub-processing unit 55.

  Also, as described above, when the termination process is completed and the supply of power to main controller 10 is cut off, first predetermined data 31a stored in first volatile memory 31 of main controller 10 is lost. I do. Therefore, the main processing unit 22 according to the present embodiment may execute the above-described battery clear processing in accordance with the battery clear signal and the state of the first predetermined data 31a stored in the first volatile memory 31. Good. Thus, erroneous determination of occurrence of battery clear in main controller 10 can be suppressed.

  More specifically, for example, after the main processing unit 22 performs battery clear processing in response to the battery clear signal, the IG switch 160 is turned off, and then the IG switch 160 is turned off before the end processing by the main processing unit 22 is completed. It shall be turned on again. At this time, if the sub control device 40 has not shifted to the sleep state, the transmission of the battery clear signal is not stopped, and the transmission is continued.

  Therefore, in the main processing unit 22, the battery clear signal is transmitted when the IG switch 160 is turned on again to perform the start-up process. It may be erroneously determined that an error has occurred, and the battery clear process may be executed again.

  Therefore, the main processing unit 22 according to the present embodiment transmits the battery clear signal and sets the first predetermined data 31a stored in the first volatile memory 31 of the main control device 10 to a predetermined state, When the first predetermined data 31a is not lost and is in a normal state, the battery clear processing is not executed.

  That is, it can be estimated that the predetermined state in which the first predetermined data 31a has not been lost is, for example, a timing before the end processing when the IG switch 160 is turned off is completed. Therefore, even when the battery clear signal is transmitted, the main processing unit 22 determines that the battery clear process accompanying the battery clear signal is being executed when the previous IG switch 160 was turned on. At this time, the battery clear process is not executed at the timing when the IG switch 160 is turned on.

  Thus, in the present embodiment, even when IG switch 160 is turned off and then immediately turned on again, main controller 10 suppresses erroneous determination of occurrence of battery clear. Can be.

<3. Timing chart of control method>
Next, a timing chart of a control method performed by the control device 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a timing chart of a control method performed by the control device 1.

  In FIG. 3, “battery connection (power supply to sub-control device)”, “IG switch”, “power supply to main control device”, “start history flag”, “battery A clear signal transmission, a status flag of the first volatile memory, and a battery clear processing execution flag.

  ON of “battery connection (supply of power to the sub-control device)” indicates that the battery 100 is electrically connected, and OFF indicates that the battery 100 has been removed. When the battery 100 is connected, power is supplied to the sub-control device 40, and thus the on / off timing is substantially the same as the on / off timing of power supply to the sub-control device 40. .

  ON of the “IG switch” indicates that the IG switch 160 has been turned on, and OFF indicates that the IG switch 160 has been turned off. ON of “power supply to main controller” indicates that power is being supplied to main controller 10, and OFF indicates that power is not being supplied. The “start history flag” corresponds to the start history data 61b, and “ON” indicates that the main control device 10 starts first after the battery is cleared and has a start history, and “OFF” indicates that there is no start history.

  “Battery clear signal transmission” ON indicates that the battery clear signal is being transmitted from the sub control device 40, and OFF indicates that the battery clear signal is not transmitted or transmission is stopped. The ON state of the “state flag of the first volatile memory” indicates that the first predetermined data 31a stored in the first volatile memory 31 is different from the predetermined state, that is, the first predetermined data 31a has disappeared. Indicates a state. ON of the "battery clearing process execution flag" indicates that the main controller 10 executes the battery clearing process, and OFF does not.

  As shown in FIG. 3, it is assumed that the battery 100 is removed at the time T1. As a result, since power is not supplied to the sub-control device 40, the start history data 61b is lost, and the start history of the main control device 10 is lost (the start history flag is turned off).

  Next, when the battery 100 is reconnected at the time T2, the sub control device 40 detects the occurrence of battery clear, and since there is no activation history of the main control device 10, the sub control device 40 outputs the battery clear signal to the main control device. Send to 10. In the example shown in FIG. 3, since the IG switch 160 has not been turned on yet, the main control device 10 is not activated.

  However, although not shown, if the IG switch 160 is turned on immediately after the battery 100 is reconnected and the main control device 10 is started, the main control device 10 responds to the battery clear signal transmitted at time T2. The battery clear processing is executed based on this.

  Next, at time T3, the sub control device 40 shifts to the sleep state, and thus stops transmitting the battery clear signal.

  Next, it is assumed that the IG switch 160 is turned on at time T4. The sub-control device 40 transmits a battery clear signal to the main control device 10 because the occurrence of the battery clear has already been detected and there is no activation history of the main control device 10.

  Then, at time T5, the sub control device 40 transmits a start instruction to the main control device 10 to start the main control device 10, and power is supplied to the main control device 10. At this time, main controller 10 transmits a battery clear signal from sub controller 40, and the state of first predetermined data 31a in first volatile memory 31 at the time of activation is different from the predetermined state, that is, Since the battery has disappeared, the battery clear process is executed (the battery clear process execution flag is turned on). When the main controller 10 is started, the state of the first predetermined data 31a in the first volatile memory 31 becomes a predetermined state.

  Next, at time T6, IG switch 160 is turned off. Thereby, main controller 10 performs the termination process, and when the termination process is completed at time T7, the supply of power to main controller 10 is cut off. When the power supply is stopped, the state of the first predetermined data 31a in the first volatile memory 31 is different from the predetermined state, that is, the state disappears, and the battery clear processing execution flag is also turned off.

  Next, at time T8, the sub control device 40 shifts to the sleep state, and thus stops transmitting the battery clear signal.

  Next, at time T9, the IG switch 160 is turned on. The sub control device 40 does not transmit the battery clear signal to the main control device 10 because the occurrence of the battery clear is not detected and the activation history of the main control device 10 exists.

  Then, at time T10, sub-control device 40 transmits a start instruction to main control device 10 to start the main control device 10, and power is supplied to main control device 10. At this time, main controller 10 does not execute the battery clear process because the battery clear signal is not transmitted from sub controller 40. When the main controller 10 is started, the state of the first predetermined data 31a in the first volatile memory 31 becomes a predetermined state.

  Next, a process when the IG switch 160 is turned on immediately after the IG switch 160 is turned off will be described with reference to FIG. FIG. 4 is a timing chart of a control method performed by the control device 1. Note that, in FIG. 4, up to time T6 is the same as up to time T6 shown in FIG.

  As shown in FIG. 4, it is assumed that the IG switch 160 is turned on again at time T61. The time T61 is before the IG switch 160 is turned off and before the termination processing by the main control device 10 is completed, and before the supply of power to the main control device 10 is interrupted. Since the sub control device 40 has not yet shifted to the sleep state, the battery clear signal is continuously transmitted to the main control device 10.

  At this time, the main controller 10 determines that the first predetermined data 31a of the first volatile memory 31 is in a predetermined state (not damaged), and therefore, the battery clear processing is performed when the IG switch 160 is turned on last time. (Here, it is determined that the process is executed at times T4 and T5), and the battery clear process is not executed (the battery clear process execution flag is turned off).

<4. Control Process of Control Device According to Embodiment>
Next, a processing procedure executed by the control device 1 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a flowchart illustrating a processing procedure executed by the sub control device 40 according to the present embodiment. FIG. 6 is a flowchart illustrating a processing procedure executed by main controller 10 according to the present embodiment.

  First, the processing procedure executed by the sub-control device 40 will be described. As shown in FIG. 5, the sub-control unit 50 of the sub-control device 40 determines whether or not the IG switch 160 has been turned on (step S10).

  When it is determined that the IG switch 160 has been turned on (Yes at Step S10), the sub control unit 50 transmits a start instruction to the main control device 10 (Step S11). On the other hand, when it is not determined that the IG switch 160 has been turned on (step S10, No), the sub-control unit 50 skips the process of step S11.

  Next, the sub control unit 50 determines whether or not the occurrence of the battery clear is detected (Step S12). When it is determined that the occurrence of battery clear has been detected (Yes at Step S12), the sub-controller 40 determines whether there is a startup history of the main controller 10 (Step S13).

  When it is not determined that there is an activation history of main control device 10 (No at Step S13), that is, when there is no activation history, sub-control unit 50 transmits a battery clear signal to main control device 10 (Step S14).

  On the other hand, when it is not determined that the occurrence of battery clear has been detected (No at Step S12), or when it is determined that there is an activation history of main controller 10 (Yes at Step S13), sub-control unit 50 determines whether the battery has been cleared. The transmission of the clear signal is stopped (step S15).

  Next, a processing procedure executed by main controller 10 will be described with reference to FIG. Here, it is assumed that main controller 10 has been started by transmitting a start instruction from sub-controller 40.

  The main control unit 20 of the main control device 10 determines whether or not a battery clear signal has been transmitted from the sub control device 40 (step S20). When it is determined that the battery clear signal has not been transmitted (step S20, No), the main control unit 20 skips the subsequent processing.

  On the other hand, when it is determined that the battery clear signal is being transmitted (step S20, Yes), the main control unit 20 determines whether the first predetermined data 31a of the first volatile memory 31 is in a predetermined state. (Step S21).

  When the first predetermined data 31a of the first volatile memory 31 is not determined to be in the predetermined state, that is, when it is determined that the first predetermined data 31a is different from the predetermined state (step S21, No), the main control unit 20 clears the battery. The process is executed (Step S22).

  On the other hand, when it is determined that the first predetermined data 31a of the first volatile memory 31 is in the predetermined state (Step S21, Yes), the main control unit 20 skips the process of Step S22, in other words, clears the battery. Do not execute processing.

  As described above, the control device 1 according to the embodiment includes the main control device 10 including the nonvolatile memory 32 and the sub-control device 40 to which power is constantly supplied from the battery 100. The sub control device 40 includes a battery clear detection unit 52 and a transmission unit 54. The battery clear detection unit 52 detects occurrence of battery clear indicating that the battery 100 has been electrically detached. Transmitter 54 transmits a battery clear signal indicating occurrence of battery clear detected by battery clear detector 52 to main controller 10. Thus, occurrence of battery clear can be detected in main controller 10 including the nonvolatile memory.

  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 may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

REFERENCE SIGNS LIST 1 control device 10 main control device 20 main control unit 22 main processing unit 31 first volatile memory 32 nonvolatile memory 40 sub-control device 50 sub-control unit 52 battery clear detection unit 53 start-up determination unit 54 transmission unit 61 second volatile Memory 70 Communication line 100 Battery

Claims (7)

A main controller having a non-volatile memory;
And a sub-control device to which power is constantly supplied from a battery.
The sub-control device includes:
A battery clear detection unit that detects the occurrence of battery clear indicating that the battery has been electrically detached,
A transmission unit that transmits a battery clear signal indicating the occurrence of battery clear detected by the battery clear detection unit to the main control device. The sub-control device includes a volatile memory,
The battery clear detection unit,
The control device according to claim 1, wherein when the data stored in the volatile memory is in a state different from a predetermined state, occurrence of a battery clear is detected. The sub-control device includes:
An activation determination unit that determines whether the main control device has been activated after the occurrence of a battery clear,
The transmitting unit includes:
3. The control device according to claim 1, wherein when the activation determination unit determines that the main control device has been activated, transmission of the battery clear signal is stopped. 4. The main controller,
Volatile memory;
A processing unit that executes a predetermined process associated with battery clearing according to the battery clear signal transmitted from the transmission unit of the sub control device and a state of data stored in the volatile memory of the main control device The control device according to any one of claims 1 to 3, further comprising: The processing unit includes:
When the battery clear signal is transmitted from the transmission unit of the sub-control device and the data stored in the volatile memory of the main control device is in a predetermined state, the predetermined process is not performed. The control device according to claim 4, wherein The transmitting unit includes:
The battery clear signal is transmitted to the main control device by setting a communication line connecting the sub control device and the main control device to a predetermined state. The control device according to item 1. A control method for a control device including a main control device including a non-volatile memory and a sub control device to which power is constantly supplied from a battery,
In the sub-control device, a battery clear detection step of detecting the occurrence of battery clear indicating that the battery is electrically detached,
A transmitting step of transmitting a battery clear signal indicating the occurrence of a battery clear detected by the battery clear detecting step to the main control device.

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