JPS61107436A - Fault diagnostic device of electronic equipment - Google Patents

Abstract

PURPOSE:To replace a defective electronic device only by designing the diagnostic device that a fault of a unit having an output/input device as an interface with other system is diagnosed automonously. CONSTITUTION:When it is supposed that a diagnostic switch 32 is turned on, a short-circuit switch 33 is turned on accordingly to make an output circuit 15 to on-state for a prescribed time only. Then the response state of an input circuit 16 is discriminated and when the said input circuit 16 is turned on in response to the on-state of the said output circuit 15, the corresponding keyboard unit 31 is discriminated as normal, and after all indicators 13a, 13b are lighted for a prescribed time, the system is restored to the normal operating state. On the other hand, when the input circuit 16 is not in on-state, the keyboard unit 31 is discriminatwed to be faulty, the indicators 13a, 13b are not lighted and the faulty state is informed to the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for diagnosing whether or not an electronic device using a microcomputer or the like is abnormal.

[Prior Art J] The applicant of the present application previously proposed a method for encoding and transmitting various vehicle data in Japanese Patent Laid-Open No. 59-80037. Using such a system, for example, the system shown in FIG. 5 can be considered. This example is a device that controls radio station selection, @listening, etc., which is a load, by using a single control.

In FIG. 5, 1 is a battery, 2 is an ignition switch, 3 is a keyboard unit for remote control, and 4 is a load control unit that controls the tuning, volume, etc. of the radio 7 based on commands from the keyboard unit 3. , keyboard unit)-3, load control unit 4
and the radio 7 are each supplied with power from the battery 1 via the ignition switch 2. The keyboard unit 3 includes a control section 11 composed of a microcombination unit 1 and the like, a key switch 12a for input operation,
12b, 12c 1 has an output circuit 15 made of a transistor as an interface with the load unit 4, and information corresponding to input operations from the key switches 12a to 12C (for example, channel selection, volume, etc.) is transmitted to the control unit 11.
A signal responsive to the time division multiplexed signal is transmitted from the output circuit 15 to the load control unit 4 via the signal line 5. The load control unit 4 includes a control section 21 composed of a microcomputer or the like, an input circuit 22 as an interface with the keyboard unit 3 composed of a pull-up resistor 228 and a protective resistor 22b, and a Yamauchi circuit 22 as an interface with the radio 7 consisting of a transistor C. Circuits 24a, 24b, 24c
1 from input circuit 22 in response to a time division multiplexed signal transmitted via signal line 5 as described above.
A signal is input and decoded by the control section 21, and a control signal for the radio 7 is outputted from the 11120 section 21 via each output circuit 24a to 24c in accordance with this decoding information.

The load control unit 4 also includes a pull-up resistor 25a1.
Input circuit consisting of protection resistor 25b and pull-up resistor 26
a, (!) It has an input circuit consisting of a low protection resistor 26b, and control status information signals (tuning status, sound m status, etc.) based on the above-mentioned control signals of the radio 7 are controlled via the respective input circuits. The load control unit 4 further has an output circuit 23 made of transistors as an interface with the keyboard unit 3, and receives input from the radio 7 through each of the above-mentioned input circuits. A signal corresponding to the control status information signal is output from the control unit 21 as a time division multiplexed signal, and a signal responsive to the signal is output from the output circuit 23 via the signal line 6 to the keyboard unit 3.
It is now transmitted to

Furthermore, the keyboard unit 3 has an input circuit 16 as an interface with the load control unit 4, which is composed of a pull-up resistor 1 (resistor 16a1 and a protective resistor 16b).
The control unit 11 receives the signal from the input circuit 16 in response to the time division multiplexed signal transmitted via the signal line 6 as described above.
inputs and decodes it, and in response to this decoding information, the control unit 11
Each output circuit 14a consists of a transistor.

A control signal is output to each indicator 13a, 13b via 14b.

That is, the control status (eg, channel selection status, etc.) of the radio 7 corresponding to the input operation from the key switches 12a to 12C is displayed on each indicator 13a113b.

By the way, abnormality diagnosis of the above-mentioned in-vehicle electronic equipment has conventionally been carried out by, for example, the control section 11 of the keyboard unit 3 according to the flowchart shown in FIG. this is,
In response to an input from a predetermined key switch, a time division multiplexed signal corresponding to the input is transmitted to the load control unit 4 side.

It waits for a response from the load control unit 4 to the transmission signal for a certain period of time. Here, if there is a response within the predetermined time, it is determined that the input operation is normal and the lighting of the indicator corresponding to the input operation is controlled. On the other hand, if there is no response from the load control unit 4 within the above-mentioned fixed time, it is determined that there is an abnormality in the electronic device. Fi is controlled so that all indicators blink.

[Problems that Hatsumachi is trying to solve] However, in the above-mentioned abnormality diagnosis, when it is determined that there is an abnormality in the device, the abnormality is determined to be an abnormality on the keyboard unit 3 side, for example, the output circuit 15 or the input circuit. 16, or an abnormality on the load control unit 4 side, for example, the input circuit 22, the output circuit 23, or the control section 2.
It is not possible to determine whether this is caused by abnormality 1.

Therefore, in the case of in-vehicle electronic equipment, dealers who do not own various testing equipment will have to check both the keyboard unit 3 and load control unit 4 when an abnormality is discovered in the electronic separate device through the above-mentioned abnormality diagnosis. I had to replace the unit.

[F-stage for solving problem J-] The present invention has been made in view of the above problems, so Ru11
To provide an abnormality diagnosing device for an electronic device that is capable of self-diagnosing an abnormality in an L unit body: a control device, and an output device and an input device connected to the clamping device and serving as an interface with other systems. In order to achieve this objective, the present invention provides at least one unit constituting an electronic device with a bypass means for constructing a path for bypassing a signal between the output device and the input device, and When a predetermined signal is outputted from the control device via the output device, it is provided with a discriminating means for discriminating the presence or absence of an input signal via the bypass means and the input device, and the discriminating result of the discriminating means is used to determine whether the device is correct or not. The apparatus is equipped with a notification means for notifying the result of an abnormality.

[Embodiments of the invention] Hereinafter, embodiments of the present invention will be explained based on the drawings.
do.

FIG. 1 shows an electronic 116 having an abnormality diagnosis device according to the present invention.
FIG. 2 is a block diagram showing a configuration example. This is similar to the one shown in FIG. 5, and is a device that can control the tuning volume of the radio, which is a load, by remote control.

In the same figure, the keyboard unit 30 is not shown in FIG.
1 Indicators 13a and 13b as notification means, and an output circuit 14a for driving each of the indicators 13a and 13b.
.

14b. In this keyboard unit 30, the control section 111 is further provided with another output port 19, and the output side of the output circuit 15 is connected to the inverter 17 and a NAND circuit 18 that is controlled by an output signal from one of the output ports. It is connected to the input side of the input circuit 16. Here, when one output port is in the on state, the signal state from the output circuit 15 and the signal state to the input circuit 16 are the same, and the inverter 1, 17 and the NAND circuit 18 are connected between the output circuit 15 and the input circuit 16. It has a signal bypass function and constitutes a bypass means.

The keyboard unit 30 having the above-mentioned structure, the load control unit 4, the radio 7, the battery 1, and the ignition switch 2 connected by each signal line 5.6 have the same structure as shown in FIG. ing.

Next, the abnormality diagnosis operation (operation of the control unit 111) in such an electronic device will be explained according to the flowchart shown in FIG.

When an input operation is performed using a predetermined key switch, the time division multiplexed signal corresponding to the input is transmitted to the load control unit 4IllI as in the conventional case, and the response from the load control unit 4 to the transmission multiplication is received for a certain period of time. wait. Here, if there is a response within the predetermined time period, it is determined that the input operation is normal, and the indicator display is controlled in accordance with the input operation. On the other hand, if there is no response from the load control unit 4 within the predetermined time, one output port is turned on and the output circuit 15 is also turned on for a predetermined time.

Then, in a step serving as a determining means, the input circuit 16
If the input circuit 16 is in the ON state in response to the ON state of the output circuit 150, it is determined that the keyboard unit 30 is normal and returns to the normal operating state. The above series of steps constitutes a determining means. On the other hand, if the input circuit 16 is not in the ON state, it is assumed that the keyboard unit 30 is abnormal. Assuming that there is an abnormality, all the indicators are controlled to light up for a certain period of time, and then the output port 19 is turned back on to return to the normal operating mode.

According to the above-mentioned abnormality diagnosis, after determining the overall abnormality as in the past, the normal abnormality of the Keyboard Cornit 3Q itself is determined, and all indicators are lit in the case of an abnormality. If all the indicators light up, it is easy to confirm that at least the keyboard unit 30 is abnormal.Furthermore, even if all the indicators do not light up, an indicator corresponding to the input operation must be displayed. , it can be easily confirmed that the load control unit 4 is abnormal. Therefore, in the event of an abnormality in the electronic device, the minimum number of units need to be replaced, and wasteful maintenance can be prevented as much as possible.

FIG. 3 is a block diagram showing a configuration example of an electronic device that implements another example of the abnormality diagnosis device according to the present invention.

This example is also a device for controlling a radio by remote control, similar to the devices shown in FIGS. 1 and 5.

In FIG. 3, the basic configuration of a keyboard unit 31, a load control unit 4, a radio 7, a battery 1,
The overall configuration including the ignition switch 2 is similar to that shown in FIGS. 1 and 5. Here, the keyboard unit 31 is provided with a diagnostic switch 32 as another example of bypass means, and when the diagnostic switch 32 is turned on, the control section 112 performs its own diagnostic control. Further, a short circuit switch 33 is provided between the output side of the output circuit 15 and the input side of the input circuit 16, and this short circuit switch 33 operates in synchronization with the on/off operation of the diagnostic switch f32. It has become.

Next, the abnormality diagnosis operation (operation of the control unit 112) in this embodiment will be explained according to the flowchart shown in FIG.

Normally, as in the past, each key switch 12a to 12
The signal corresponding to the input operation by G is transmitted to the load control unit 4 side as a time division multiplexed signal, while the time division multiplexed signal corresponding to the control condition +11 of the radio 7 transmitted from the load control unit 4 side is input. Based on the decoded information □, the lighting of each indicator □:□゛13a, 13b as a notification means is controlled.

Here, when the diagnostic switch 32 is turned on, the short circuit switch 33 is accordingly turned on. Thereafter, the output circuit 15 is turned on for a certain period of time. Then, the response state of the input circuit 16 is determined, and if the input circuit 16 is in the on state in response to the on state of the output circuit 15, it is assumed that the keyboard unit 31 is normal and all the indicators are turned off for a certain period of time. After controlling the lighting, it returns to the normal operating state. On the other hand, if the input circuit 16 is not in the on state, it is assumed that the keyboard unit 31 is abnormal, and normal operation is resumed without controlling the lighting of the indicator. The above series of steps constitutes a determining means.

According to the abnormality diagnosis as described above, it is possible to easily determine whether the keyboard unit 31 is normal or not based on the lighting state of the indicator. That is, if all the indicators light up when the diagnostic switch 32 is turned on, it can be confirmed that the keyboard unit 31 is normal; if the indicators do not light up when the diagnostic switch 32 is turned on, the keyboard unit It can be confirmed that either the output circuit 15 in 31, the input circuit 16, the path between the output circuit 15 and the input circuit 16, or the control unit 112 is abnormal.

If the abnormality diagnosis device shown in FIGS. 1 to 4 is adopted not only for the keyboard unit but also for the load control unit, more accurate abnormality judgment will be possible.

[Effects of the Invention] As explained above, according to the present invention, it is possible to detect an abnormality in a single functional unit having a control device and an output device and an input device connected to the control device and serving as an interface with other systems. Self-diagnosis will become possible, and if an electronic device that has multiple functional units malfunctions, it will only be necessary to replace the minimum number of functional units, making it possible to prevent wasteful maintenance of the electronic device as much as possible. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of an electronic device having an abnormality diagnosis device according to the present invention, and FIG.
3 is a flowchart showing the operation of the Ilj 111 section, FIG. 3 is a block diagram showing an example of the configuration of an electronic device that realizes another example of the abnormality diagnosis device according to the present invention, and FIG. 4 is a block diagram showing the control in FIG. 3. Fig. 5 is a block diagram showing an example of the configuration of an electronic device having a conventional abnormality diagnosis device, and Fig. 6 shows the operation of the 1lil control section in Fig. 5. FIG. 1...Battery 2...Ignition switch 3.30.31...Keyboard unit 4...Load control unit 5.6...Signal line 7...Radio 11.11
1.112...Control unit 12a, 12b, 12cm...Key switch 1' 13a, 13b...Indicator 15.23...-Output circuit 16.22...Input circuit

Claims (1)

[Claims] An abnormality diagnosis device for an electronic device, comprising at least two units having a control device, and an output device and an input device connected to the control device and serving as an interface with other systems, wherein at least one of the units A bypass means is provided for constructing a path for bypassing a signal between the output device and the input device, and when a predetermined signal is output from the control device via the output device, an input signal is input via the bypass means and the input device. What is claimed is: 1. An abnormality diagnostic device for electronic equipment, comprising a determining means for determining the presence or absence of a signal, and a reporting means for notifying a determination result by the determining means as a result of a normal abnormality in the equipment.