JP4618617B2 - Fault diagnosis device for power supply path of external power supply type controller - Google Patents

Description

  The present invention provides a power supply path failure of an external power supply type controller that diagnoses that the power supply path to the controller of an external power supply type controller (control device) that receives power supply from an external DC power supply source is broken. The present invention relates to a diagnostic device.

  If the power supply path from the external DC power supply source to the controller is disconnected, the controller cannot operate and the disconnection detection determination cannot be performed. As a conventional power failure detection device for a controller, Patent Document 1 below discloses a failure detection device that includes an instantaneous interruption countermeasure circuit and detects an instantaneous interruption failure. If there is a failure, it cannot be detected.

  Further, Patent Document 2 below discloses a device having a circuit only for power failure detection and using a memory backup power source as a second power supply path. Using a memory is not possible with a controller that does not have a memory backup power supply.

JP-A-8-114530 JP-A-8-198038

  As described above, in this conventional main device, if a power failure has occurred before the operation of the controller, the failure cannot be detected. In the method using the nonvolatile memory, the memory backup power source is not used. There was a problem that it could not be realized with a controller without it.

  The present invention provides an external power supply type controller that does not have a memory backup power supply or the like and receives power from an external DC power supply source even when the power supply path to the controller is disconnected before the operation of the controller. It is an object of the present invention to provide a power supply path failure diagnosis device for an external power supply type controller capable of diagnosing a failure such as a disconnection of a road.

  The present invention is a power supply path failure diagnosis device for an external power supply type controller that receives power from an external DC power supply source, and is provided between a positive terminal and a negative terminal of the external DC power supply source by a first power supply path. A power supply unit that is connected and supplied with power, and is connected in series with the external load so that an external load comes to the positive electrode terminal side between the positive electrode terminal and the negative electrode terminal of the external DC power supply source by a second power supply path, A load driving circuit for switching between operation and non-operation of the external load by opening and closing the second power supply path; the second power supply path between the external load and the load driving circuit; When the second power supply path is higher in voltage than the first power supply path, the power supply from the second power supply path is transferred to the first power supply path. A commutation path including a backflow prevention element to be flown, and a front A voltage detection unit for detecting a power supply voltage in the power supply unit; a communication unit for receiving a power supply voltage value detected by another controller having the same configuration and the same specification supplied from the external DC power supply source; and the load drive circuit A control unit connected to the voltage detection unit and the communication unit, wherein the control unit is configured to provide a difference between a power supply voltage value detected by the voltage detection unit and a power supply voltage value from another unit from the communication unit. In the power supply path failure diagnosis device for an external power supply type controller, the first power supply path includes a failure diagnosis means for determining that the first power supply path is faulty when the power supply is greater than or equal to a predetermined value.

  According to the present invention, even if the power supply path to the controller is disconnected before the operation of the controller, it is possible to diagnose a failure such as a disconnection of the power supply path.

Embodiment 1 FIG.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a power supply path failure diagnosis apparatus for an external power supply type controller according to an embodiment of the present invention. In FIG. 1, a first controller 1, a second controller 2, and an external load 4 are connected to an external DC power supply source 3.

  The first controller 1 switches a load drive circuit 5 having a circuit configuration for switching the operation / non-operation of the external load 4 and commutating the power supply of the second power supply path P2 to the first power supply path P1. Prepare. Further, the voltage detection unit 7 that detects a power supply voltage from the external DC power supply source 3 in the power supply unit 6 and outputs a power supply voltage signal (power supply voltage value) indicating the detected voltage is the same as the first controller 1 and has the same configuration. A communication unit 8 that receives a power supply voltage signal (power supply voltage value) indicating a power supply voltage from the external DC power supply source 3 at the power supply unit 26 detected by the voltage detection unit 27 from the second controller 2 of the specification, disconnection, etc. The control unit (not shown) for notifying the occurrence of a failure caused by the control and the control unit (not shown) is connected to the load drive circuit 5, the voltage detection unit 7, the communication unit 8, and the notification unit 10 to control failure diagnosis. The control part 9 which consists of a computer etc. to perform is provided.

  The power supply unit 6 is connected between the positive terminal A and the negative terminal C of the external DC power supply source 3 by a first power supply path (power supply line) P1. The load driving circuit 5 is connected in series with the external load 4 so that the external load 4 comes to the positive terminal A side between the positive terminal A and the negative terminal C of the external DC power supply source 3 by the second power supply path P2. The second power supply path (power supply line) P2 is opened and closed to switch the operation and non-operation of the external load 4, and is a switch composed of a transistor Tr as shown in FIG. The commutation path (commutation line) TP connects the second power supply path P2 between the external load 4 and the load drive circuit 5 and the first power supply path P1 of the power supply unit 6 to the second power supply path P1. When the voltage of the power supply path P2 is higher than that of the first power supply path P1, the power supply path from the second power supply path P2 is commutated to the first power supply path P1 and is a backflow prevention element. Including a diode D;

  In the state where the second power supply path P2 is opened by the load driving circuit 5 and the external load 4 and the power supply unit 6 are connected in series to both ends of the external DC power supply source 3 by the commutation path TP, the external load 4 Since the current for operating the device does not flow, the device becomes non-operational.

  The control unit 9 includes a load drive circuit control unit 9a, a failure diagnosis unit 9b, a failure notification unit 9c, and a main control unit 9d that controls a control target. The control of the control target by the main control means 9d may be control applied to any application, and since it is not particularly relevant to the present invention, description thereof will be omitted.

  On the other hand, the second controller 2 includes a power supply unit 26 and a power supply unit 26 connected between the positive terminal A and the negative terminal C of the external DC power supply source 3 by a third power supply path (power supply line) P3. The voltage detection unit 27 that detects the power supply voltage at the output and outputs a power supply voltage signal (power supply voltage value) indicating this, and the power supply voltage detected by the voltage detection unit 27 with respect to the communication unit 8 of the first controller 1 A communication unit 28 for sending signals is provided.

  In the control unit 9 of the first controller 1, the failure diagnosis unit 9 b is configured such that the difference between the power supply voltage value detected by the voltage detection unit 7 and the power supply voltage value from the communication unit 8 in the second controller 2 is a predetermined value or more. In this case, it is determined that there is a failure such as disconnection in the first power supply path P1. The load drive circuit control means 9a controls opening and closing of the load drive circuit 5, and maintains the load drive circuit 5 in an open state until the failure diagnosis means 9b finishes the failure diagnosis. Further, the load drive circuit control means 9a continues to maintain the load drive circuit 5 in the open state when the failure diagnosis means 9b determines that there is a failure. The failure notification unit 9c causes the notification unit 10 to notify the failure when the failure diagnosis unit 9b determines that there is a failure.

  As a specific method for achieving the failure diagnosis means 9b, the absolute value of the difference between the power supply voltage value V1 detected by the first controller 1 and the power supply voltage value V2 detected by the second controller 2 is predetermined. It is determined that the first power supply path P1 to the first controller 1 has failed when the value is equal to or greater than the value and the state equal to or greater than the predetermined value continues for a predetermined time.

  If the power supply unit 6 of the first controller 1 and the power supply unit 26 of the second controller 2 connected to the common external DC power supply source 3 have the same configuration and the same specification, power is supplied through the first power supply path P1. In this case, the power supply voltage value V1 detected by the voltage detection unit 7 of the first controller 1 and the power supply voltage value V2 detected by the voltage detection unit 27 of the second controller 2 are the same.

  However, the first controller 1 causes the load driving circuit 5 to open the second power supply path P2, and the second power supply path P2, the external load 4, the second power supply path P2, and the commutation path TP (diode). D) → power supply unit 6 → first power supply path P1, that is, when power is supplied via the second power supply path P2, the power supply voltage value V1 detected by the voltage detector 7 is the first Since the power is supplied directly to the power supply unit 6 via the power supply path P1, the external load 4 and the diode D are used. Therefore, the power supply voltage value V2 of the second controller 2 having the same configuration and the same specification as that of the power supply voltage value V1 is compared. If the following expression (1) is satisfied, the power is supplied through the first power supply path P1. I can judge.

  Power supply voltage value V1-Power supply voltage value V2 <predetermined value α (1)

  On the other hand, when the power supply voltage value V1 and the power supply voltage value V2 are compared and the following expression (2) is satisfied, the first power supply path P1 has failed and power is supplied via the second power supply path P2. Can be judged.

  Power supply voltage value V1-Power supply voltage value V2 ≧ predetermined value α (2)

  Since the voltage of the power supply may vary depending on the load drive or the like, it is ensured that the first power supply path P1 is broken by confirming that the expression (2) continues for a predetermined time. Can be detected.

  If the failure diagnosis unit 9b determines that a failure has occurred, the failure notification unit 9c receives a result and generates a predetermined warning in the notification unit 10 including a lamp, a lighting device, and the like, and the first power supply to the first controller 1 The user is warned that the supply path P1 has failed.

  FIG. 2 is an operation flowchart showing a failure diagnosis processing operation in the failure diagnosing means 9b of the control unit 9. Hereinafter, the operation will be described according to this flowchart. Note that the operation of this operation flowchart is repeated (for example, at a predetermined cycle).

  First, an absolute value of a difference between the power supply voltage value V1 and the power supply voltage value V2 is obtained, and it is determined whether or not this is equal to or greater than a predetermined value α (step S1). If it is determined in step S1 that | feed voltage value V1−feed voltage value V2 | ≧ predetermined value α, the failure determination time is counted (step S2), and the counted failure determination time has exceeded a predetermined time. Whether or not (step S3). If it is determined in step S1 that | feed voltage value V1−feed voltage value V2 | <predetermined value α, the failure determination time is reset (step S4). Finally, if it is determined in step S3 that the counted failure determination time has exceeded the predetermined value α, it is determined that there is a failure and the failure determination process is terminated (step S5).

  If it is determined in step S3 that the failure determination time has not exceeded the predetermined value α, the routine returns to step S1 as failure diagnosis is in progress and the routine is repeated. On the other hand, in step S4, since the failure cannot be determined, the failure determination time is reset and the failure diagnosis process is terminated.

  Thus, the power supply voltage value V1 and the power supply voltage value V2 are the power supply voltage value V1 of the power supply unit 6 of the first controller 1 and the power supply voltage value V2 of the power supply unit 26 of the second controller 2 received by communication. Is determined to be greater than or equal to a predetermined value, and it is determined that the first power supply path P1 to the first controller 1 has failed such as disconnection by determining that this state continues for a predetermined time. be able to.

  Further, since the failure diagnosis result is notified to the user by an alarm, the user can recognize that the first power supply path P1 to the first controller 1 has failed.

  FIG. 3 is a partial block diagram when the load drive circuit of FIG. When the transistor Tr is driven by the control unit 9, a circuit to the negative terminal C on the minus (−) side of the external DC power supply source 3 is connected and the external load 4 is activated. In this configuration, when the external load 4 is operating, power is not supplied to the commutation channel TP, and the second power supply path P2 functions to supply power to the power supply unit 6 of the first controller 1. Disappear. At this time, if the first power supply path P1 fails, the first controller 1 stops.

  Therefore, until the failure diagnosis for the first power supply path P1 is performed, the transistor Tr is opened (OPEN), the external load 4 is deactivated, and the second power supply path P2 is connected via the commutation path TP. By making it possible to continue supplying power to the power supply unit 6, it is possible to reliably diagnose that the first power supply path P1 to the first controller 1 has failed. The transistor Tr is kept open until the failure diagnosis is completed.

  Further, as a result of the failure diagnosis on the first power supply path P1, if it is determined that the first power supply path P1 is faulty, the transistor Tr is not closed and the external load 4 is not operated. By allowing the second power supply path P2 to continue to supply power to the power supply unit 6 via the commutation path TP, the first controller 1 has failed in the first power supply path P1. Can be notified to the user by the notification unit 10.

1 is a block configuration diagram of a power supply path failure diagnosis device for an external power supply type controller according to an embodiment of the present invention. FIG. 2 is an operation flowchart showing a failure diagnosis processing operation in a failure diagnosis unit of the control unit in FIG. 1. FIG. 2 is a partial block configuration diagram when the load driving circuit of FIG. 1 is configured by transistors.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st controller, 2nd controller, 3 external DC power supply source, 4 external load, 5 load drive circuit, 6 power supply part, 7 voltage detection part, 8 communication part, 9 control part, 9a load drive circuit control Means 9b failure diagnosis means 9c failure notification means 9d main control means 10 notification section 26 power supply section 27 voltage detection section 28 communication section A positive terminal C negative terminal D diode P1 first power supply Supply path, P2 Second power supply path, TP commutation path, Tr transistor.

Claims (4)

A power supply path failure diagnosis device for an external power supply type controller that receives power from an external DC power supply source,
A power supply unit connected between a positive electrode terminal and a negative electrode terminal of the external DC power supply source through a first power supply path to be fed;
The second power supply path is connected in series with the external load so that the external load is on the positive terminal side between the positive terminal and the negative terminal of the external DC power supply source, and opens and closes the second power supply path. A load drive circuit for switching operation and non-operation of the external load;
The second power supply path between the external load and the load driving circuit is connected to the first power supply path of the power supply unit, and the second power supply path is connected to the first power supply path. A commutation path including a backflow prevention element that commutates power supplied from the second power supply path to the first power supply path when the voltage is high;
A voltage detection unit for detecting a power supply voltage in the power supply unit;
The same configuration fed from the external DC power supply source, a communication unit that receives a feeding voltage value detected by another controller of the same specification,
A control unit connected to the load driving circuit, the voltage detection unit, and the communication unit;
With
When the difference between the supply voltage value detected by the voltage detection unit and the supply voltage value at another controller from the communication unit is equal to or greater than a predetermined value, the control unit has a failure in the first power supply path. An apparatus for diagnosing a power supply path of an external power supply type controller, comprising a failure diagnosis means for determining.   The control unit further includes load drive circuit control means for controlling opening and closing of the load drive circuit, and maintains the load drive circuit in an open state until the failure diagnosis is completed by the failure diagnosis means. The power supply path failure diagnosis device for the external power supply type controller according to claim 1.   3. The power supply for an externally fed controller according to claim 2, wherein the load drive circuit control means continues to maintain the load drive circuit in an open state when the failure diagnosis means determines that there is a failure. Road fault diagnosis device.   4. The apparatus according to claim 1, further comprising a notification unit that notifies a failure, wherein the control unit further includes a failure notification unit that notifies the failure by the notification unit when the failure diagnosis unit determines that there is a failure. The power supply path failure diagnostic apparatus for an externally fed controller according to any one of the above.

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