JP2017134717A - Power supply control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control system capable of detecting anomalies in dark current as well as anomalies of an ECU with no communication capability, and of quickly performing an initialization process.SOLUTION: Drive control means (CPU 100) controls a power supply device (P1, P2) to stop supplying power to a control device (ECU1, etc.) determined to have a dark current anomaly happening therein by the drive control means in accordance with a predefined capacity of a capacitor (701) over a predetermined power supply cutoff period (T2) before completion of an initialization process.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a power supply control system, and more particularly to a power supply control system that monitors dark current and controls power supply to a load or power supply cutoff.

  In recent years, the number of electronic devices (electronic devices) mounted on vehicles and the like has been increasing, and the number of mounted ECUs (Electronic Control Units) as control devices for controlling these electronic devices is also increasing. . For this reason, the probability that any one of the ECUs causes an operation failure tends to increase.

  In particular, when the vehicle system mounted on the vehicle is turned off (that is, when the ignition switch is turned off), any ECU can shift to a power saving state (also called a sleep state) due to some trouble. If not, dark current will increase. Due to this increased dark current, the power of the in-vehicle battery may be consumed, or the battery itself may be deteriorated, and the vehicle may not be able to start.

  “Dark current” refers to current that flows through various circuits in a vehicle with the ignition switch turned off, and includes current consumed by a standby current of a microcomputer constituting the ECU, a clock, a security system, and the like. It is. The dark current in a vehicle is generally 50 mA or less, but some vehicles that are equipped with more electrical components may consume a larger dark current.

  Therefore, various technologies relating to a power supply control system that suppresses dark current by monitoring the current consumption of each ECU and shutting off the power supply based on the monitoring result have been proposed (for example, Patent Document 1). .

  In the power supply control system according to Patent Document 1, each control device (ECU) self-reports the current value state, calculates a threshold value by the monitoring device based on the total value, and shuts off the power supply when the threshold value is exceeded. Like to do.

  More specifically, in the power supply control system 600 according to Patent Document 1, as shown in FIG. 11, a plurality of control devices 501A, 501B, and 501C connected to the same power supply line 500 have their own knowledge. The operating state or the assigned threshold current value suitable for the operating state is self-reported to the monitoring device 501E via the communication line 530 as information for calculating the cutoff threshold current value. In response to this, the monitoring device 501E determines allocation threshold current values for the individual control devices 501A, 501B, and 501C, and dynamically updates the cutoff threshold current values using the calculated values of the allocation threshold power supply currents. When the power output current value is set and exceeds the cutoff threshold current value, the power switch 510 on the power supply line 500 is set to the cutoff state.

JP 2009-81948 A

  However, in the technique described in Patent Document 1, a plurality of control devices (ECUs) perform self-reporting by communication for setting the threshold value, and there is a merit that the accuracy of the threshold value is high. Need to be connected. Therefore, there is a problem that power control cannot be performed for an ECU or the like that does not have a communication function.

  In addition, since the occurrence of current abnormality can be determined only by the total current obtained by summing the currents of the ECUs, there is a problem that the abnormality may not be detected depending on the combination of operation states of electronic devices controlled by the ECUs.

  In addition, since the current abnormality detection circuit in the prior art is shared during sleep and wake, it is necessary to achieve both high accuracy of current detection and expansion of the detection range, which complicates the circuit configuration and increases costs. There was also an inconvenience.

  Further, when a current abnormality is detected and the power supply to the ECU is shut off, a capacitor is provided in the ECU, and the power supply voltage inside the ECU is not immediately shut off. That is, since the voltage gradually decreases depending on the current consumption of the power supply IC and CPU provided in the ECU, it takes time until the CPU is reset, and a quick initialization process (power-on reset) cannot be performed. was there.

  The present invention has been made in view of the above problems, can detect an abnormality in dark current, can also detect an abnormality in an ECU that does not have a communication function, and performs a quick initialization process. An object of the present invention is to provide a power supply control system capable of performing the above.

  In order to achieve the above object, a power supply control system according to the first aspect of the present invention includes an operating state for controlling operations performed by a plurality of electronic devices according to predetermined conditions, and a power saving state for pausing the control. A plurality of control devices that can be transferred to the control system, a predetermined number of power supply devices that supply drive power to the control devices of each system, a secondary battery that supplies power to each of the power supply devices, and charging of the secondary battery A current sensor for detecting a discharge current; and a drive control means for controlling the drive of the control device and the power supply device. The drive control means is based on a detection result of the discharge current of the secondary battery by the current sensor. And determining whether or not a dark current abnormality has occurred in any of the control devices, and each of the power supply devices includes a first switch for supplying power to the control device and a system division of the control devices. Second to do The drive control means controls the on / off states of the first switch and the second switch so as to perform an initialization process for returning the control device to a normal state. A capacitor having a predetermined capacity for holding an internal power supply voltage, and the drive control means determines whether the abnormality of the dark current has occurred or not, according to the predetermined capacity of the capacitor, The power supply device is controlled to stop power supply over a predetermined power-off time until the initialization process is completed.

  According to a second aspect of the present invention, in the power supply control system according to the first aspect, when the holding time of the internal power supply voltage of the capacitor is T1, and the power cut-off time is T2, the relationship of T2> T1 is established. It is comprised so that it may become.

  According to a third aspect of the present invention, in the power supply control system according to the first or second aspect, the power cut-off time includes a maximum value of a power supply voltage of each power supply device and a minimum current consumption of each control device. It is calculated from the value, the maximum capacity of the capacitor, and the minimum value of the reset voltage when the initialization process is performed.

  According to a fourth aspect of the present invention, in the power supply control system according to any one of the first to third aspects, the drive control means operates the electronic device within the power cut-off time. In this case, the power supply device is controlled so that power supply to the corresponding control device is resumed even when dark current abnormality occurs and the initialization process is being executed.

  According to a fifth aspect of the present invention, in the power supply control system according to any one of the first to fourth aspects, the first switch detects a current flowing through the first switch. In addition to the detection result of the discharge current of the secondary battery by the current sensor and the ON / OFF state of the first switch and the second switch, the drive control means is connected to the current detection means. In consideration of the detection result, it is determined which of the systems has an abnormality of dark current.

  According to a sixth aspect of the present invention, in the power supply control system according to the fifth aspect, the drive control means is configured to shut off the power supply to the system that is determined to have a dark current abnormality. It is characterized in that the switching of the on / off state of one switch or the second switch is controlled.

  According to a seventh aspect of the present invention, in the power supply control system according to the fifth or sixth aspect, the drive control means is normal for a control device belonging to a system in which it is determined that a dark current abnormality has occurred. An on / off state of the first switch and the second switch is controlled so as to perform an initialization process for returning to a state.

  According to the present invention, it is possible to provide a power supply control system that can detect an abnormality in dark current, can detect an abnormality in an ECU that does not have a communication function, and can perform a quick initialization process. Can do.

It is a circuit diagram which shows the example of the circuit structure of the power supply control system which concerns on embodiment. It is a block diagram which shows the example of the whole structure of the power supply control system which concerns on embodiment. It is a block diagram which shows the structural example of ECU applied to the power supply control system which concerns on embodiment. It is a graph which shows the relationship of the ECU internal power supply voltage at the time of supply voltage interruption | blocking in the case where immediate execution of power-on reset is impossible. It is a graph which shows the relationship of ECU internal power supply voltage at the time of supply voltage interruption | blocking in the case where immediate execution of a power-on reset is possible. It is a flowchart which shows the example of the process sequence of the process at the time of the dark current abnormality generation | occurrence | production performed with the power supply control system which concerns on embodiment. It is a flowchart which shows the example of the process sequence of the subroutine which concerns on the dark current abnormal system detection process in the power supply control system which concerns on embodiment. It is a flowchart which shows the example of the process sequence of the subroutine which concerns on the power-on reset process in the power supply control system which concerns on embodiment. It is a graph which shows the ON / OFF state of each switch at the time of the dark current abnormality detection in the power supply control system which concerns on embodiment. It is a graph which shows the ON / OFF state of each switch at the time of the power-on reset in the power supply control system which concerns on embodiment. It is a circuit diagram which shows the example of a circuit structure of the power supply control system which concerns on a prior art.

[Embodiment]
An embodiment of the present invention will be described with reference to FIGS.

(About configuration example of power control system)
FIG. 1 is a circuit diagram illustrating an example of a circuit configuration of the power supply control system S1 according to the embodiment.

  The power supply control system S1 according to the present embodiment includes, for example, an operating state (also referred to as a wake state) for controlling operations performed by a plurality of electronic devices (not shown) such as a vehicle-mounted watch and a security system, and the control. Control devices (ECU1 to ECU4, ECU10, 11, etc., hereinafter referred to as ECUs), which can be shifted to a power saving state (also referred to as a sleep state) to be suspended. A predetermined number (two in the example shown in FIG. 1) of power supply devices (first power supply device P1 and second power supply device P2) for supplying driving power to ECU1 to ECU4 of each system, and power to each power supply device A secondary battery 300 composed of a nickel metal hydride battery, a lithium ion battery, etc., a current sensor SN for detecting the charge / discharge current of the secondary battery 300, and ECU1 to ECU4 Fine power supply P1, P2 drive control means for controlling the driving of (composed of CPU or logic IC, and the like. Incidentally, abbreviated as later CPU) is a system comprising a 100.

  Further, as shown in FIG. 1, each power supply device P1 control device (ECU1 to ECU4, etc.), P2 is a first switch (supplied with standby power supply) to the control devices (ECU1 to ECU4, etc.) SW0) and second switches (SW1 to SW3) for systematic control devices (ECU1 to ECU4, etc.).

  More specifically, the first power supply device P1 will be described as an example (that is, other power supply devices such as the second power supply device P2 have the same configuration), and the connection connector of the first power supply device P1. A secondary battery 300 is connected to C3 via a power line PL1. Power line PL1 branches in power supply device P1, and is connected to external second power supply device P2 via fuse 150 and power line PL2.

  In addition, the first switch SW0 and the second switches SW1 to SW3 are connected in parallel to the power line extending through the fuse 150 via the node N1.

  Details of other configurations will be described later.

  The second switches SW1 to SW3 are predetermined control devices (ECU1 to ECU4, etc.) so that the first switch SW0 is kept in an on state in normal times and energizes each control device (ECU1, ECU4, etc.). And is configured to be switched on / off according to various states.

  The first switch SW0 is connected to a current detection unit 400 that detects a current flowing through the first switch SW0.

  More specifically, the current detection unit 400 includes a sense resistor R connected in series to the first switch SW0 and a comparator 200 connected via wirings L2 and L3 extending from both ends of the sense resistor R. Consists of A signal output from the comparator 200 based on the voltage drop due to the current flowing through the sense resistor R is input to the A / D (analog-digital conversion) terminal 107 of the CPU 100 via the wiring L4. . With this configuration, the current flowing through the first switch SW0 can be detected.

  Here, the current detection unit 400 is not an essential configuration, and the current detection unit 400 may be omitted.

  That is, when the current detection unit 400 is provided as will be described later, it is possible to specify whether any dark current abnormality has occurred in any of the systems (for example, systems 1 to 3), while the current detection unit If the ECU 400 is not provided, it is possible to determine whether any of the ECUs 1 to 4 can determine whether a dark current abnormality has occurred. If an abnormality has occurred, But it will be reset.

  On the opposite side to the first switch SW0 of the sense resistor R, backflow prevention diodes D1a to D1c are connected via a node N2, and are connected to ECU1 to ECU4 via nodes N4 to N6 and connectors C4 to C6. It is connected.

  In the example shown in FIG. 1, ECU1 and ECU2 are connected and belong to the same system at a node N7 outside the first power supply device P1.

  A second switch SW1 is connected between the nodes N1 and N4. The control terminal included in the second switch SW1 is connected to the control signal output terminal 104 of the CPU 100 via the wiring L5.

  A second switch SW2 is connected between the nodes N1 and N5. The control terminal included in the second switch SW2 is connected to the control signal output terminal 105 of the CPU 100 via the wiring L6.

  A second switch SW3 is connected between the nodes N1 and N6. The control terminal included in the second switch SW3 is connected to the control signal output terminal 106 of the CPU 100 via the wiring L7.

  Further, the current sensor SN is connected to the communication terminal 101 of the CPU 100 via the interface I / F 201, the connector C1, and the data line DL1, and the detection result of the charge / discharge current of the secondary battery 300 is received. Yes.

  Further, the second power supply device P2 is connected to the communication terminal 102 of the CPU 100 via the interface I / F 202, the connector C2, and the data line DL2.

  A specific example of the system (system 1 to system 3) will be described later with reference to FIG.

  Then, the CPU 100 determines the detection result of the discharge current of the secondary battery 300 by the current sensor SN, the on / off state of the first switch SW0 and the second switches SW1 to SW3, and the detection result by the current detection unit 400. Based on this, it is determined which of the systems (system 1 to system 3) has the dark current abnormality. Details of how to determine the dark current abnormality will be described later.

  Further, the CPU 100 controls switching of the on / off state of the first switch SW0 or the second switches SW1 to SW3 so as to cut off the power supply to the system where it is determined that the dark current abnormality has occurred. It is supposed to be. Thereby, unnecessary power supply from the secondary battery 300 is prevented, and consumption of the secondary battery 300 (so-called battery exhausted state) can be suppressed in advance. Therefore, when the power supply control system S1 according to the present embodiment is mounted on a vehicle or the like, it is possible to suppress the occurrence of a situation where the engine cannot be started due to battery exhaustion.

  Further, the CPU 100 performs control so as to perform initialization processing (power-on reset) for returning the control devices (ECU1 to ECU4, etc.) belonging to the system determined to have an abnormality in dark current to the normal state. It has become. The processing procedure for each control will be described later.

(About the overall configuration of the power control system)
FIG. 2 is a configuration diagram illustrating an example of the overall configuration of the power supply control system S1 according to the embodiment.

  FIG. 2 shows an example in which the power supply control system S1 is configured by four power supply devices P1 to P4. Note that the number of power supply devices is not limited to two as shown in FIG. 1 and four as shown in FIG. 2, but can be any number.

  Each of the power supply devices P1 to P4 has the same configuration as the power supply device P1 shown in FIG.

  In the example shown in FIG. 2, for the power system, the secondary battery 300 and the power supply devices P1 to P4 are connected via the power lines PL1 to PL4.

  As for the signal system, the current sensor SN and the CPU 100 included in each of the power supply devices P1 to P4 are connected via the data lines DL1 to DL4.

  With the power supply control system S1 having such a configuration, even when an abnormality occurs in an ECU that is not connected to communication in each of the power supply devices P1 to P4, it can be detected. Further, it is possible to determine an abnormality based on the current value for each system, and it is possible to achieve an effect that an abnormality recovery operation of the ECU can be performed by performing a power-on reset.

(ECU configuration, etc.)
The configuration and the like of the ECU (ECU1 to ECU4, ECU10, 11) will be described with reference to FIGS.

  FIG. 3 is a block diagram illustrating a configuration example of an ECU applied to the power supply control system according to the embodiment.

  As shown in FIG. 3, ECUs (ECU1 to ECU4, ECU10, 11) are connected via connector C to supply power supply voltage V1 supplied from the above-described secondary battery 300 and power supply devices P1 to P4. .

  The connector C is connected in series with a backflow preventing diode D10, a CPU 704 that controls various electronic devices, and a power supply IC 702 that generates a driving power source for the CPU 704.

  A capacitor 701 having a predetermined capacity is connected in parallel with the diode D10 to the cathode N10 of the diode D10.

  A predetermined voltage ECU internal power supply voltage V2 appears at the node 10 to which the capacitor 701 is connected.

  Here, with reference to FIG. 4 and FIG. 5, the relationship of the ECU internal power supply voltage when the supply voltage is cut off will be described.

  FIG. 4 is a graph showing the relationship between the ECU internal power supply voltage when the supply voltage is cut off when immediate execution of the power-on reset is impossible.

  As shown in FIG. 4A, when the supply power supply voltage V1 is cut off over the time (power supply cut-off time) T10 by the control of the CPU 100, the ECU internal power supply voltage V2 is reset as shown in FIG. It will not be lower than Vr.

  This is because even if the power supply to the ECU is cut off, the power supply voltage V2 inside the ECU is not cut off immediately due to the electricity stored in the capacitor 701 inside the ECU, and as shown in FIG. This is because the ECU internal power supply voltage V2 gradually decreases due to the current consumption.

  Therefore, when the power cut-off time T10 shown in FIG. 4 is shorter than the holding time T1 of the internal power supply voltage V2 of the capacitor 701, the power-on reset of the CPU 704 is not immediately executed and takes time. .

  Therefore, in the present invention, the CPU 100 as the drive control means performs power-on reset (initialization processing) on the ECU determined to have an abnormality in dark current in accordance with the predetermined capacity of the capacitor 701. When stopping power supply over a predetermined power-off time T2 until completion, assuming that the internal power-supply voltage holding time of the capacitor 701 is T1 and the power-off time is T2, T2> T1 It is configured.

  With this configuration, as shown in FIG. 5A, when the supply power supply voltage V1 is cut off over the power cut-off time T2 under the control of the CPU 100 as shown in FIG. V2 falls below the reset voltage Vr.

  Note that the reset voltage Vr is determined by a voltage when the power supply voltage of the CPU 703 is monitored and the reset function of the CPU 703 is operated, a voltage at which the CPU 703 itself cannot hold internal information, and the like.

  Thereby, it is possible to perform a power-on reset (initialization process) quickly.

  The power shut-off time T2 includes the maximum value of the power supply voltage of each power supply device P1 to P4, the minimum value of the current consumption of each ECU (ECU1 to 4, ECU10, 11), the maximum capacity of the capacitor 701, and the power-on reset (initial It can be calculated from the minimum value of the reset voltage Vr when performing the conversion process.

  In addition, if the user operates the electronic device within the power cut-off time T2, the CPU 100 applies even if a dark current abnormality occurs and a power-on reset (initialization process) is being performed. The power supply devices P1 to P4 may be controlled so as to resume power supply to the braking ECU. Thereby, the user's request for using the electronic device can be satisfied, and the power supply reset (initialization process) of the corresponding ECU can be performed thereafter to cope with the dark current abnormality.

  Moreover, according to the power supply control system S1 having such a configuration, it is possible to detect even when an abnormality occurs in an ECU that is not connected to communication. Moreover, abnormality can be determined based on the electric current value for every system | strain. Furthermore, an effect such as being able to perform an abnormal recovery operation by power-on reset can be obtained.

  Further, in the power supply control system S1 according to the present embodiment, the current sensor SN is a monitoring device (for example, installed outside) that monitors the charge state of the secondary battery 300 based on the detection result of the charge / discharge current of the secondary battery 300. May be configured to be transmitted to a server or the like.

  Further, when current consumption larger than a predetermined vehicle dark current is detected by current sensor SN, power supply devices P1, P2 or a control device (ECU1 to ECU4, etc.) may be activated by communication. .

  Moreover, when ECU1-ECU4 grade | etc., Is started by dark current abnormality detection by the current sensor SN, ECU1-ECU4 grade | etc., Can also be comprised so that generation | occurrence | production of dark current abnormality may be notified to each power supply device P1, P2. .

  The power supply devices P1 and P2 may control the on / off states of the first switch SW0 and the second switches SW1 to SW3 when the dark current abnormality occurrence signal is received.

  Further, the power supply devices P1, P2 or the ECU1 to ECU4 and the like may perform control so that the current sensor SN shifts to the sleep state after executing the power-on reset.

  The power supply devices P1 and P2 detect the current value of each system in a state where no dark current abnormality has occurred and record it in a nonvolatile memory or the like, and use the difference between the recorded result and the detected current value as a reference. Thus, the system in which the dark current abnormality has occurred may be determined. As a result, it is not necessary to increase the accuracy of current detection, and the cost can be reduced.

  Further, according to the above-described configuration, when the engine cannot be started due to the battery running out even when the dark current is in the normal range due to long-term parking or the like, the first switch SW0 and the second switch The occurrence of such a situation can be suppressed in advance by turning off the switches SW1 to SW3.

(Process when dark current abnormality occurs)
With reference to the flowcharts shown in FIGS. 6 to 8, examples of processing procedures of dark current abnormality occurrence processing and power-on reset processing executed in the power supply control system S1 according to the present embodiment will be described.

  Here, FIG. 6 is a flowchart showing an example of a processing procedure of dark current abnormality occurrence processing executed in the power supply control system S1 according to the present embodiment.

  FIG. 7 is a flowchart showing an example of a subroutine procedure related to dark current abnormal system detection processing, and FIG. 8 is a flowchart showing an example of a subroutine procedure related to power-on reset processing.

  For convenience of explanation, it is assumed that the power supply control system S1 is mounted on the vehicle, and the dark current abnormality processing is executed by the CPU 100 of the power supply device P1 shown in FIG.

  When the dark current abnormality occurrence process shown in the flowchart of FIG. 6 is started, it is first determined in step S10 whether or not a dark current abnormality occurrence signal has been received. That is, when the current sensor SN included in the secondary battery 300 detects a consumption current larger than a preset vehicle dark current (when a dark current abnormality occurs), the detection result indicates the data line DL1. It is determined whether or not the detection result signal (dark current abnormality occurrence signal) has been received.

  If the determination result is “No”, the process is terminated as is, and if “Yes”, the process proceeds to step S11.

  In step S11, a dark current abnormal system detection processing subroutine is executed.

  Here, the processing procedure of the dark current abnormal system detection processing will be described with reference to the flowchart of FIG. The on / off state of each switch (first switch SW0, second switch SW1 to SW3) during execution of the dark current abnormal system detection process is as shown in the chart of FIG.

  In step S1101, the first switch SW0 is turned on again. Thereby, as shown in FIG. 9, in the dark current abnormal system detection process in each system (system 1 to system 3), SW0 maintains the “ON” state.

  Next, in step S1102, an ON setting process is performed for the second switches SW1 to SWn (n is an integer; n = 3 in the example illustrated in FIG. 1). Thereby, all the second switches SW1 to SWn are once set to the ON state.

  In step S1103, the system number “i” is set to 1 (system i = 1), and the process proceeds to step S1104.

  In step S1104, SWi OFF setting processing is executed. Accordingly, for “system 1” in FIG. 9, only the second switch SW1 is turned off, and the other first switch SW0, second switch SW2, and SW3 are turned on.

  In step S1105, a current detection process using the detection result of the current detection unit 400 connected to the first switch SW0 is executed. In step S1106, a dark current abnormality determination process is executed based on the current detection result. That is, when the detection result by the current detection unit 400 exceeds a preset dark current abnormality threshold value, it is determined as “abnormal”, and when it does not exceed it, it is determined as “normal”.

  If it is determined as “abnormal”, the process proceeds to step S1107 to perform an abnormal system recording process. That is, if it is determined as “abnormal” in the system 1, that fact is stored in, for example, a non-volatile memory (not shown) connected to the CPU 100, and the process proceeds to step S1108.

  On the other hand, if “normal” is determined in step S1106, the process proceeds to step S1108, an ON setting process of SWi (ie, SW1) is executed, and the process proceeds to step S1109.

  In step S1109, an abnormal system determination end confirmation process is performed to determine whether i ≧ n. When it is determined that i ≧ n is not yet satisfied (in the case of “No”), the process proceeds to step S1110, the system number “i” is incremented by “1”, and then the process proceeds to step S1104. Thus, the processes from steps S1104 to 1109 are repeatedly executed until the system number “i” reaches a predetermined number (i = 3 in the configuration shown in FIG. 1).

  That is, as shown in FIG. 9, for the “system 2”, only the second switch SW2 is turned off, and the dark current abnormality occurs when the other first switches SW0, second switches SW1, SW3 are turned on. Whether or not there is a dark current abnormality in the state where only the second switch SW3 is turned off and the other first switch SW0, second switch SW1 and SW2 are turned on. These determination processes and the like are sequentially executed.

  As a result, it is possible to detect in which system the dark current abnormality has occurred without leakage.

  On the other hand, if it is determined in step S1109 that i ≧ n (“Yes”), the process proceeds to step S1111 to execute processing for setting all the second switches SW1 to SWn to OFF. Return to the main process of FIG.

  Returning to the flowchart of FIG. 6, it is then determined in step S12 whether a dark current abnormal system has been detected. Then, if it is determined that it has not been detected (in the case of “No”), the processing is ended as it is. On the other hand, when it is determined that it has been detected (in the case of “Yes”), the process proceeds to step S13 and a subroutine of power-on reset processing is executed.

  Here, a processing procedure of the power-on reset process will be described with reference to the flowchart of FIG. Note that the on / off states of the respective switches (the first switch SW0 and the second switches SW1 to SW3) during execution of the power-on reset process are as shown in the chart of FIG.

  In step S101, ON setting processing is performed for the second switches SW1 to SWn (n is an integer. In the example illustrated in FIG. 1, n = 3). Thereby, all the second switches SW1 to SWn are once set to the ON state.

  Next, in step S102, an OFF setting process of the first switch SW0 is performed.

  Next, in step S103, the system number “i” is set to 1 (system i = 1), and the process proceeds to step S104.

  In step S104, it is determined whether or not system i (that is, system 1 here) = abnormal system.

  If the determination result is “No”, the process proceeds to step S108, and if “Yes”, the process proceeds to step S105.

  In step S105, an OFF setting process of SWi (here, SW1) is executed.

  As a result, as shown in FIG. 10, for the system 1, the first switch SW0 and the second switch SW1 are turned off, and the second switches SW2 and SW3 are turned on.

  In step S106, time excess (determining whether a predetermined time (power-on reset time) has elapsed) and system operation confirmation processing (determining whether the user has operated the electronic device) are executed.

  If the power-on reset time is less than (that is, T2 <T1 when the holding time of the internal power supply voltage of the capacitor 701 is T1 and the power cut-off time is T2), and there is no system operation by the user If it is determined, the same determination process is repeated.

  On the other hand, when it is determined that the power-on reset time has been exceeded (that is, T2> T1 when the holding time of the internal power supply voltage of the capacitor 701 is T1 and the power-off time is T2), or the user If it is determined that there is a system operation according to, the process proceeds to step S107.

  In step S107, after performing ON setting processing of SWi, the process proceeds to step S1308.

  In step S108, a system operation confirmation process is executed, and if it is determined that there is a system operation, the process returns to the main process in FIG.

  On the other hand, if it is determined that there is no system operation, the process proceeds to step S109, and a power-on reset end confirmation process is performed to determine whether i ≧ n.

  If it is determined that i ≧ n is not yet satisfied (if i <n), the process proceeds to step S110, the system number “i” is incremented by “1”, and the process returns to step S104. Thereby, the processing from step S104 to step S109 is repeatedly executed until the system number “i” reaches a predetermined number (i = 3 in the configuration shown in FIG. 1).

  That is, as shown in FIG. 10, for “system 2”, the power-on reset in the state where the first switch SW0 and the second switch SW2 are OFF and the second switches SW1 and SW3 are ON, The power-on reset is sequentially executed in a state where the first switch SW0 and the second switch SW3 are OFF and the second switches SW1 and SW2 are ON.

  As a result, power-on reset can be executed without omission for ECUs belonging to the system in which the dark current abnormality occurs.

  On the other hand, if it is determined in step S109 that i ≧ n, the process proceeds to step S111, the on-setting process for the first switch SW0 is executed, and then the process proceeds to step S112.

  In step S112, after executing the process of setting all the second switches SW1 to SWn to OFF, the process returns to the main process of FIG.

  As described above, according to the power supply control system S1 according to the present embodiment, the power-on reset (initialization process) can be quickly executed for the ECU in which the dark current abnormality has occurred.

  Further, according to the present embodiment, it is possible to detect even when an abnormality occurs in an ECU that is not connected to communication.

  Further, it is possible to determine an abnormality based on the current value for each system, and it is possible to obtain an effect that an abnormality recovery operation can be performed by a power-on reset.

  Further, in the power supply device P1 or the like, the current value of each system in a state where no dark current abnormality has occurred is detected and recorded in a nonvolatile memory or the like, and the difference between the recorded result and the detected current value is used as a reference. When the system in which the dark current abnormality has occurred is determined, it is not necessary to increase the accuracy of current detection, and the cost can be reduced.

  The power supply control system of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit is replaced with an arbitrary configuration having the same function. Can do.

S1 ... Power control system C1-C6 ... Connectors D1a-D1c, D10 ... Backflow prevention diode ECU1-ECU4, ECU10, ECU11 ... Control device L1-L7 ... Wiring N1-N7, N10 ... Node P1-P4 ... Power supply device R ... Sense resistor SN ... Current sensor 100 ... CPU (drive control means)
101, 102 ... Communication terminals 104 to 106 ... Output terminals 107 ... A / D terminals 150, 151 ... Fuse 200 ... Comparator 201, 202 ... I / F
DESCRIPTION OF SYMBOLS 300 ... Secondary battery 400 ... Current detection means 500 ... Power supply line 501A ... Control apparatus 501E ... Monitoring apparatus 510 ... Power switch 530 ... Communication line 600 ... Power supply control system 701 ... Capacitor 702 ... Power supply IC
703 ... CPU

Claims (7)

A control device of a plurality of systems capable of shifting to an operating state for controlling operations performed by a plurality of electronic devices according to a predetermined condition and a power saving state for stopping the control,
A predetermined number of power supply devices for supplying driving power to the control devices of the respective systems;
A secondary battery for supplying power to each of the power supply devices;
A current sensor for detecting a charge / discharge current of the secondary battery;
Drive control means for controlling the drive of the control device and the power supply device,
The drive control means determines whether a dark current abnormality has occurred in any of the control devices based on the detection result of the discharge current of the secondary battery by the current sensor,
Each of the power supply devices includes a first switch for supplying power to the control device, and a second switch for dividing the control device,
The drive control means controls on / off states of the first switch and the second switch so as to perform an initialization process for returning the control device to a normal state;
Each control device includes a capacitor having a predetermined capacity for holding an internal power supply voltage,
The drive control means has a predetermined power-off time until the initialization process is completed according to the predetermined capacity of the capacitor for a control device that is determined to have an abnormality in dark current. A power supply control system that controls the power supply device to stop power supply.   2. The power supply control according to claim 1, wherein T <b> 2> T <b> 1 is established, where T <b> 1 is a holding time of the internal power supply voltage of the capacitor and T <b> 2 is a power-off time. system.   The power shutdown time is calculated from the maximum value of the power supply voltage of each power supply device, the minimum value of the current consumption of each control device, the maximum capacity of the capacitor, and the minimum value of the reset voltage when performing the initialization process. The power supply control system according to claim 1, wherein the power supply control system is a power supply control system.   When the electronic device is operated within the power cut-off time, the drive control means is directed to the corresponding control device even if dark current abnormality occurs and the initialization process is being executed. The power supply control system according to any one of claims 1 to 3, wherein the power supply apparatus is controlled so as to resume power supply. The first switch is connected to current detection means for detecting a current flowing through the first switch,
The drive control means considers the detection result of the current detection means in addition to the detection result of the discharge current of the secondary battery by the current sensor and the on / off state of the first switch and the second switch. The power supply control system according to any one of claims 1 to 4, wherein a dark current abnormality is detected in which of the systems.   The drive control means controls the switching of the on / off state of the first switch or the second switch so as to cut off the power supply to the system where it is determined that the dark current abnormality has occurred. The power supply control system according to claim 5, wherein   The drive control means turns on the first switch and the second switch so as to perform initialization processing for returning to a normal state for a control device belonging to a system in which it is determined that a dark current abnormality has occurred. The power supply control system according to claim 5 or 6, wherein an off state is controlled.

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