JPS6040353Y2 - Notification means check circuit for vehicle central warning system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a notification means check circuit for a central warning system for vehicles.

BACKGROUND OF THE INVENTION A vehicle centralized warning system that detects and warns of abnormalities in various devices mounted on a vehicle generally uses a lamp or a buzzer as an abnormality indicator (notification means).

Normally, these abnormality indicators are turned off or inactive when various devices mounted on the vehicle are normal, in order to exhibit their display effects and to save power.

By the way, in this case, the error indicator will turn off or become fully operational even when the lamp is disconnected or the buzzer is malfunctioning, so just because the error indicator is off or inactive, does it mean that the installed equipment is normal? Or it cannot be determined whether the display is abnormal.

Therefore, it is necessary to check the operation of indicators such as these lamps at the time of the initial inspection of the vehicle.

FIG. 1 is a circuit diagram showing a conventional example of a warning means (lamp) check circuit of a central warning system for vehicles.

In Fig. 1, switches S11 to S1n are installed in various devices mounted on a vehicle, and are turned on when each device is normal, but when an abnormality occurs, they are turned off and a high-potential signal 1 is turned on. (V.

. ) is added to the AND circuits A11 to A1n.

Therefore, if an abnormality occurs in any device, the corresponding switches Sll to S in are turned off, the corresponding AND circuits A11 to A1n become operable, and the output signal of the pulse oscillator Os 1 is output from the AND circuit that is enabled to operate. It is applied to the gates of transistors T11-Tin via circuits A11-Aln and OR circuits 011-01n, turning transistors T1□-T1n on and off.

As a result, the corresponding lamps L11 to L□wa blink.

Use check switch S to check the lamp at the start of work inspection.

This is done by turning on.

That is, the output signals of all the OR circuits become 1, and all the transistors T11 to Tin are turned on.

Therefore, a normal lamp lights up continuously, and a lamp with an abnormality such as a disconnection does not light up.

By checking the lighting status of these lamps, it is determined whether the lamps are normal or abnormal.

However, such a check circuit requires an operator to operate the check switch Sc every time a start-up inspection is performed.

Furthermore, since the operation of the display device is inspected even when all the lamps are normal, there is a drawback that the start-up inspection takes a long time.

This invention was made to eliminate the above-mentioned drawbacks.
After turning on the key switch, detect the disconnection of each lamp on the display. If there is even one disconnection, a lighting signal is applied to all the lamps, the normal lamp is turned on, the malfunctioning lamp is turned off, and the display is abnormal. The present invention provides a lamp check circuit for a vehicle centralized warning system that detects.

Hereinafter, the present invention will be described in detail based on one embodiment of the accompanying drawings.

In FIG. 2, sensors C□ to Cn detect an abnormality in each on-vehicle device, and generate a lighting signal when an abnormality occurs in the device.

This lighting signal is applied to the drive circuits D1-D to light or blink the corresponding lamps L1-Ln.

The disconnection detection circuits B and -Bn detect disconnections in the corresponding lamps L1 to Ln, and when detecting a disconnection, generate a disconnection signal and apply it to the lighting signal generator G.

When the lighting signal generator G receives the disconnection signal, it generates a lighting signal for all drive circuits D1 to Dn.

As a result, a normal lamp (a lamp with no disconnection) lights up, but a malfunctioning lamp does not light up, so that a malfunctioning lamp can be clearly detected.

FIG. 3 shows a specific circuit example of the circuit shown in FIG.

In FIG. 3, switches 521 to S2n correspond to the sensors C1 to Cn shown in FIG. 2, and are turned on when each device is normal and turned off when an abnormality occurs.

All switches S21 to S2n are on, and lamps L21 to
When all L2n are normal, the output of the latch circuit is O as described later, so all the inputs of the OR circuits 021 to 02n become O and output O.

Therefore, the outputs of the AND circuits A21 to A2n become 0, and none of the lamps h, to L2n light up.

Now, when an abnormality occurs in the device corresponding to switch S21 and switch S2□ is turned off, signal 1 is applied to AND circuit A2□ via OR circuit 021.

Therefore, the AND circuit A21 becomes operational and outputs the output pulse signal P of the pulse oscillation IS2.

As a result, the transistor T21 is turned on and off, and the lamp L21 is turned on and off at the cycle of the signal P.

Now, if any one of the lamps L21 to L2n, for example the lamp L2n, is disconnected, the NAND circuit NA will output the signal 1.
is output and added to the AND circuit AD.

The AND circuit AD has a signal obtained by inverting the output of the pulse oscillator Os2 by an inverter Iv added to its other input, and outputs a signal 1 when the output power of the pulse oscillator Os2 is at the - level.

This signal is held in the latch circuit, and the OR circuit 0
Added to 2□~02n.

As a result, all the AND circuits N□-A2y1 become operational and output the signal P output from the pulse oscillator Os2 to the gates of the transistors T21-T2n.

Therefore, all the lamps L21 to L2 (n-□) other than the disconnected lamp L2n are turned on and off at the same cycle as the signal P.

Naturally, the disconnected lamp L2n does not light up.

Note that the above operations are performed immediately after a key switch (not shown) is turned on at the time of start-up inspection.

In addition, the latch circuit is initially cleared after the key switch is turned on.

Further, when the broken lamp L2n is visually recognized, the latch circuit L1 is reset by appropriately applying a reset signal R8 to stop the lighting operation.

Note that the output signal P of the pulse oscillator 032 is connected to the inverter I.
The reason why the output of the NAND circuit N^ is applied to the latch circuit via the AND circuit Aゎ to which the signal inverted at V is applied is that when the lamps L21 to L2n are off, the output of the NAND circuit N^ is applied to the latch circuit. This is to check for disconnections.

This is because when a lamp lights up, the input of the NAND circuit N corresponding to the lamp becomes low level, and the AND circuit A
Without D, there will be a latch circuit even if the lamp is normal.

This is because signal 1 is latched.

Note that the buzzer can be checked in the same manner in a vehicle centralized warning system in which a buzzer is connected instead of the above-mentioned lamps L21 to L2n.

Further, in the device of the above embodiment, the lamps are checked even when the vehicle is in operation, and when an abnormality occurs, the other lamps except the lamp in which the abnormality has occurred are blinked.

As explained above, according to the present invention, it is possible to check the notification means of the central warning system for vehicles without any special operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example of a notification means check circuit of a central vehicle warning system, and FIG. 2 is a block diagram showing an embodiment of a notification means check circuit of a central vehicle warning system according to the present invention. FIG. 3 is a circuit diagram showing a detailed circuit example of the notification means check circuit of the central warning system for vehicles according to the present invention. A21~A2n, AD...AND circuit, B□~
Bn...Disconnection detection circuit, C1-Cn...
・Sensor, D□~Dn...Drive circuit, G...
...Lighting signal generator, ■, ...Inverter,
蜆〜Ln、L、21〜L2n・・・・・・Lamp, La
......Latch circuit, NA...NAND circuit, 0,2...Pulse oscillator, 02□~Ozn・
...OR circuit, S21-S2n...switch, T2□-T2n...transistor.

Claims (1)

[Scope of utility model registration request] In a centralized warning system for a vehicle, in which notification means are provided corresponding to devices mounted on a vehicle, and an abnormality in each device is alerted by the operation of the notification means, when an abnormality occurs in at least one of the notification means, An alarm means check circuit for a centralized alarm system for vehicles, comprising an alarm signal generation circuit that sends an alarm signal to all alarm means, and when an abnormality occurs, all the other alarm means except the alarm means in which the abnormality has occurred are operated. .