JP4576889B2 - Warning display device - Google Patents

Description

  The present invention relates to a warning display device for notifying a user by emitting a warning light when an electronic control unit is operating abnormally.

  Conventionally, a technique for notifying a user of an abnormality when an abnormality occurs in the operation of an electronic control unit mounted on a vehicle is known, for example, in Patent Document 1 below.

  In the vehicle abnormality notification device described in Patent Document 1, when a valid light-off signal is received from the electronic control unit of the airbag to be inspected, the warning light is not turned on and the light is kept off. The warning light is turned on when it becomes impossible to receive a valid turn-off signal from the electronic control unit.

  As described above, as an apparatus for notifying the abnormality of the electronic control unit, as shown in FIG. 3, the warning lamp display 110 built in the meter device and the electronic control unit 120 are connected by the communication harness 130, and the warning lamp The display 110 receives power from the power supply 140 and controls the warning lights PD1 and PD2 corresponding to the functions of the electronic control unit 120 to be turned on or off. The warning light indicator 110 is connected to a power source 140, a microcomputer 111, warning lights PD1, and PD2 via a power harness, and further, the warning light PD1, current control resistor R1, and drive circuit TR1 are connected to the power source 140. The warning lamp PD2, the current control resistor R2, and the drive circuit TR2 are further connected in series to the power source 140.

  Such a warning light indicator 110 communicates with the electronic control unit 120 by the microcomputer 111 to monitor the operation state of the electronic control unit 120, and warns when the electronic control unit 120 is operating normally. The lights PD1 and PD2 are turned off.

  On the other hand, when the electronic control unit 120 is abnormally stopped, the microcomputer 111 recognizes that fact and controls the lighting of the warning lamps PD1 and PD2. At this time, if the function corresponding to the warning light PD1 is abnormally stopped, the microcomputer 111 turns on the drive circuit TR1 and the drive circuit TR2 to supply current to the warning light PD1 and the warning light PD2 and turn on the light. And

JP 2003-231455 A

  By the way, when an electronic control unit having a plurality of functions is mounted on a vehicle having different specifications, there are functions to be used and functions not to be used among the functions of the electronic control unit depending on the specifications and grades of the vehicle. However, when the above-described vehicle abnormality notification device is applied to a meter device, the meter device cannot determine the presence or absence of each function of the electronic control unit. It is necessary to prepare.

  On the other hand, even if the microcomputer 111 cannot determine the presence or absence of the function of the electronic control unit 120, as shown in FIG. 4, for example, when the electronic control unit 120 has a function corresponding to the warning light PD1. A harness 150 for connecting the power supply 140 and the warning lamp PD1 is provided, and when the electronic control unit 120 does not have a function corresponding to the warning lamp PD1, the harness 150 is not provided. Thereby, use or non-use of warning light PD1 can be distinguished.

  However, when the harness 150 is provided, it is necessary to sufficiently ensure the reliability of the harness 150 against disconnection or ground fault. That is, when a disconnection or a ground fault occurs, if an abnormality occurs in the function of the electronic control unit 120, power supply from the power supply 140 to the warning lamp PD1 becomes impossible, and the warning lamp PD1 cannot be turned on. It was not possible to control the turning on and off of the warning light corresponding to the function.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a warning display device that can reliably turn on a warning lamp when an abnormality occurs in an electronic control unit. .

The present invention is a warning display device that notifies an abnormal state of an electronic control unit having a plurality of functions, and is provided corresponding to each function of the electronic control unit, and a plurality of warnings that emit light when a voltage is applied thereto. A plurality of drive circuits that are provided for each of the lamps and switch between an ON state in which a voltage is applied to the warning lamp and an OFF state in which no voltage is applied to the warning lamp, and the state of the electronic control unit Control means for turning on the drive circuit and applying a voltage to the warning lamp when an abnormality of the control unit is detected.
In such a warning display device, the warning lamp corresponding to the function that does not exist in the electronic control unit solves the above-mentioned problem by stopping the application of the voltage to the warning lamp by the function stop means. The function stop means is a harness that connects the power source connected to the anode side of the warning light and the cathode side of the warning light. The function stop means may include a switch connected to the cathode side of the warning light, and a harness for connecting the power source and the ground terminal connected to the anode side of the warning light and holding the switch in a cut-off state. good.

  According to the warning display device of the present invention, even when a warning light corresponding to a function that does not exist in the electronic control unit is provided, the operation of lighting the warning light can be stopped. Therefore, at the time of manufacturing to connect the warning light and the power supply, it is possible to stop the light emission of the warning light only by providing a function stop means corresponding to the function not used by the electronic control unit, and an abnormality occurs in the electronic control unit. If this happens, the warning light can be turned on reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The present invention is applied to, for example, a warning light indicator 10 configured as shown in FIG.

  The warning light indicator 10 is built in, for example, a meter device of a vehicle, and is configured to be connected by an electronic control unit 20 and a communication harness 30. This warning lamp display 10 notifies the user when an abnormality occurs in the function of the electronic control unit 20.

  The electronic control unit 20 includes, for example, an ABS (Anti-lock Brake System), a VDC (Vehicle Dynamics control), a BCM (Body Control Module), a TPMS (Tire Pressure Monitoring System), and an airbag control function. An ECU (Electric Control Unit) having a plurality of functions. Such an electronic control unit 20 is divided into a function to be used and a function not to be used depending on the specification and grade of the vehicle on which it is mounted, and executes only the function set to be used. Therefore, the electronic control unit 20 is configured to be used in common regardless of the specification and grade of the vehicle.

  On the other hand, the meter device is provided with a warning display unit corresponding to the function of the electronic control unit 20 and mounted on the vehicle, and the warning light indicator 10 has a warning light PD corresponding to all the functions of the electronic control unit 20. Provided. In the following description, it is assumed that the electronic control unit 20 having two functions or the electronic control unit 20 having one function is connected to the warning light indicator 10, and as the warning light indicator 10, FIG. A case where two warning lights PD1 and PD2 are provided will be described.

  The warning light indicator 10 includes two warning display circuits (first warning display) provided corresponding to two functions of the microcomputer 11 connected to the electronic control unit 20 via the communication harness 30 and the electronic control unit 20. Circuit, a second warning display circuit). The microcomputer 11, the first warning display circuit, and the second warning display circuit are branched from the connection point a of the power supply harness 41 and connected in parallel to the power supply 40, and are configured to operate with current flowing therethrough. .

  The first warning display circuit includes a photodiode PD1 (warning lamp PD1) that is a warning light, a current control resistor R1, and a drive circuit 12 connected in series, and a drive circuit 12 that is a transistor switch connected to a ground terminal 42. Has been. Similarly, in the second warning display circuit, a photodiode PD2 (warning lamp PD2) that is a warning light, a current control resistor R2, and a driving circuit 13 are connected in series, and the driving circuit 13 that is a transistor switch is connected to the ground terminal 42. Has been configured.

  In the first warning display circuit and the second warning display circuit, the drive circuit 12 and the drive circuit 13 are connected to the microcomputer 11, and the state of the drive circuit 12 and the drive circuit 13 is turned on by a control signal from the microcomputer 11. And can be switched between shut-off states.

  The microcomputer 11 monitors the communication state with the electronic control unit 20, and when the communication with the electronic control unit 20 is interrupted, that is, when an abnormality occurs in the function of the electronic control unit 20, the drive circuit 12 and the drive circuit 13. Is in a conductive state (on state). As a result, the current from the power supply 40 flows from the anode to the cathode of the warning lamp PD1 and the warning lamp PD2 to emit light. Further, the currents flowing through the warning lamp PD1 and the warning lamp PD2 are limited by the current control resistor R1 and the current control resistor R2, respectively. Such a microcomputer 11 functions as a control unit that controls application of voltage to the warning lamp PD1 and the warning lamp PD2.

  In such a warning light indicator 10, the function stopping power harness 43 branched from the power harness 41 is connected to the first warning display circuit corresponding to one of the two functions of the electronic control unit 20 that is not used. Has been. One end of the function stopping power supply harness 43 is connected to the connection point b of the power supply harness 41, and the other end is connected to the cathode side of the warning light PD1, that is, the connection point c between the warning light PD1 and the current control resistor R1. It is connected.

  In the warning light indicator 10 provided with the function stop power harness 43 as described above, when the microcomputer 11 detects an abnormality of the electronic control unit 20 and makes the drive circuit 12 and the drive circuit 13 conductive, the current control From the resistance value Ra of the resistor R1, the voltage drop Vad of the drive circuit 12, and the potential Va at the connection point c, a current Ia expressed by the following equation flows through the drive circuit 12.

Ia = (Va−Vad) / Ra
At this time, the potential Vi at the connection point a and the potential Va at the connection point c are the same potential, so that no current flows through the warning lamp PD1, and no light is emitted. As a result, only the warning lamp PD2 corresponding to only the function possessed by the electronic control unit 20 is emitted, and the warning lamp PD1 corresponding to the function not possessed by the electronic control unit 20 is not emitted.

[Effect of the first embodiment]
As described in detail above, according to the warning light indicator 10 according to the first embodiment to which the present invention is applied, even when the warning light PD1 corresponding to the function not used by the electronic control unit 20 is provided. By providing the function stopping power supply harness 43, the operation of turning on the warning lamp PD1 can be stopped. Therefore, at the time of manufacture in which the warning light indicator 10 and the power source 40 are connected, the warning light of the warning display circuit can be obtained only by providing the function stop power harness 43 in the warning display circuit corresponding to the function not used by the electronic control unit 20. The light emission of the PD can be stopped, and the warning lamp PD can be reliably turned on when an abnormality occurs in the electronic control unit 20.

  Therefore, for example, even when a disconnection or a ground fault occurs in the function stopping power supply harness 43, only the warning lamp PD of the warning display circuit to which the function stopping power supply harness 43 is connected is turned on. It is possible to avoid a situation in which the warning lamp PD is not turned on when an abnormality occurs in the control unit 20, and the reliability can be improved. That is, according to this warning light indicator 10, as shown in the above-mentioned FIG. 4, the harness is connected to the warning light PD that should be turned on when an abnormality occurs, as in the case where a harness connected to the power source 40 is provided. When disconnection or the like occurs in the case, it is possible to avoid a situation in which the warning lamp PD cannot be turned on even if an abnormality of the electronic control unit is detected by the microcomputer.

[Second Embodiment]
Next, the warning light indicator 10 according to the second embodiment will be described. In addition, about the part similar to the above-mentioned 1st Embodiment, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIG. 2, this warning lamp indicator 10 is provided with an on / off circuit 21 as a switch between the current control resistor R1 and the drive circuit 12 as a function stop means for stopping the lighting, and the warning lamp A function stopping harness 22 connected to a connection point d connecting the power source 40 and the on / off circuit 21 on the anode side of the PD 1 is provided.

  In such a warning light indicator 10, one end of the function stopping harness 22 is connected to the on / off circuit 21, the resistor R 11 and the power supply 40, and the other end of the function stopping harness 22 is connected to the ground terminal 23. . In such a configuration, since the current from the power supply 40 normally flows to the ground terminal 23 and the on / off circuit 21 is in a cut-off state, even when the drive circuit 12 is turned on by the microcomputer 11, The current does not flow through the warning lamp PD1, and the lighting can be stopped.

On the other hand, when the function of the warning lamp PD1 is not stopped and the function stop harness 22 and the ground terminal 23 are not provided from the connection point d, the current corresponding to the voltage drop of the on / off circuit 21 is warned. It will not flow to the lamp PD1. That is, the current flowing through the warning lamp PD1 is Von / off when the voltage drop of the on / off circuit 21 is Von / off.
Ia = (Vi−Vad−Von / off) / Ra
It becomes.

  As described above in detail, according to the warning light indicator 10 according to the second embodiment to which the present invention is applied, the on / off circuit 21 that cuts off the current flowing through the drive circuit 12 and the on / off circuit 21 are held in the cut off state. By providing the function stopping harness 22 and the grounding terminal 23, the operation of turning on the warning lamp PD can be stopped. Therefore, only the on / off circuit 21, the function stopping harness 22 and the grounding terminal 23 are provided in the warning display circuit corresponding to the function not used by the electronic control unit 20 at the time of manufacturing for connecting the warning lamp display 10 and the power source 40. Light emission of the warning lamp PD of the warning display circuit can be stopped.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is a circuit diagram which shows the structure of the warning light indicator which concerns on 1st Embodiment to which this invention is applied. It is a circuit diagram which shows the structure of the warning light indicator which concerns on 2nd Embodiment to which this invention is applied. It is a circuit diagram which shows the structure of the conventional warning light indicator. It is a circuit diagram for demonstrating the subject with respect to the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Warning light indicator 11 Microcomputer 12, 13 Drive circuit 20 Electronic control unit 21 On-off circuit 22 Function stop harness 30 Communication harness 40 Power supply 41 Power harness 42 Grounding terminal 43 Function stop power harness PD1, PD2 Warning light R1, R2 Current Resistance for control

Claims (2)

In a warning display device that notifies an abnormal state of an electronic control unit having a plurality of functions,
A plurality of warning lights that are provided corresponding to each function of the electronic control unit and emit light when a voltage is applied;
A plurality of drive circuits that are provided for each of the warning lights and switch between an on state in which a voltage is applied to the warning lights and an off state in which no voltage is applied to the warning lights;
Control means for monitoring the state of the electronic control unit and detecting an abnormality of the electronic control unit to turn on the drive circuit and apply a voltage to the warning light;
A function stop means for stopping the application of voltage to the warning light corresponding to a function not present in the electronic control unit ;
The warning display device , wherein the function stop means is a harness connecting a power source connected to the anode side of the warning light and a cathode side of the warning light . In a warning display device that notifies an abnormal state of an electronic control unit having a plurality of functions,
A plurality of warning lights that are provided corresponding to each function of the electronic control unit and emit light when a voltage is applied;
A plurality of drive circuits that are provided for each of the warning lights and switch between an on state in which a voltage is applied to the warning lights and an off state in which no voltage is applied to the warning lights;
Control means for monitoring the state of the electronic control unit and detecting an abnormality of the electronic control unit to turn on the drive circuit and apply a voltage to the warning light;
A function stop means for stopping the application of voltage to the warning light corresponding to a function not present in the electronic control unit ;
The function stopping means is
A switch connected to the cathode side of the warning light;
A warning display device , comprising: a harness that connects a power source connected to an anode side of the warning light and a ground terminal, and holds the switch in a cut-off state .

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