JP2662356B2 - Air horn control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air horn which is retrofitted in place of an existing horn.

[0002]

2. Description of the Related Art For example, as a circuit for blowing a horn provided in a vehicle, there is a circuit as shown in FIG. In the figure, reference numeral 1 denotes a horn having one terminal grounded to GND, the other terminal connected to the positive contact of a battery 4 having a negative pole connected to the positive contact of the battery 4 via a contact a of the horn relay 2 and a fuse 3 grounded to GND. The positive pole is grounded to GND via a relay coil of the horn relay 2 and further via a horn switch 5. And
When the horn switch 5 is pressed, the coil of the horn relay 2 is excited, and the contact a of the relay is closed to supply the power supply voltage of the battery 4 to the horn 1.

As shown in FIG. 4 (b), one terminal of a horn 1 is grounded to GND via a horn switch 5, and the other terminal is connected to a positive electrode of a battery via a fuse 3. When the horn switch 5 is pressed, the horn 1 outputs a blow sound. The presence or absence of the horn relay 2, which is the difference between the above two circuits,
It depends on the type of vehicle. In general, the horn switch 5 is provided in a vehicle compartment (not shown), and other devices are provided in an engine room (not shown).

Here, an air horn may be optionally attached instead of the above-mentioned horn.
The air horn FIG. 5 (a), as shown in (b), closing the by switching <br/> cross at the position showing the power supply line of the horn 1 × mark, to press the horn switch 5 Hornli
To the coil of the power relay 29 via the
The Rukoto actuates <br/> the power relay 29 by applying a power supply voltage of Tteri 4, start the compressor 30, and outputs a blowing sound by supplying compressed air by the compressor to air horn 31.

[0005] In the air horn described above, Honsu
Power relay 29 is turned on in response to switch 5 being turned on.
Therefore, if the horn switch 5 is only turned on for a short time, the contact of the power relay 29 is opened immediately, so that the pressure of the compressor 30 does not rise completely and the air horn 31 blows sufficiently. Sound could not be output.

[0006]

The present inventor has sought to solve the above problem by newly connecting the control circuit shown in FIG. The input terminal 5 of the control circuit 51
2, a battery (not shown) via resistors R1 to R3
Are connected to the power supply terminal 53 to which the positive pole is connected.
The base of a PNP transistor 54 is connected to the nodes of the resistors R1 and R2. The emitter of the transistor 54 is connected to the power supply terminal 53 via a resistor R3, and its collector is grounded to GND via a resistor R4.

The collector of the transistor 54 includes:
An inverting input terminal of a comparator 57 is connected via a delay circuit including a resistor 55 and a capacitor 56.
A non-inverting input terminal + of the comparator 57 has a resistor R
6, is connected to the power supply terminal 53 via R3, and is also grounded to GND via a resistor R7. The output terminal of the comparator 57 is connected to a non-inverting input terminal + via a resistor R8, and is connected to resistors R9 and R1.
The power supply terminal 53 is connected via 0 and R3.

The output terminal of the comparator 57 has a PNP
Transistor 58 is connected, and the emitter of the transistor 58 is connected to the power supply terminal 53. The collector of the transistor 58 is grounded to GND via a diode D1 in the reverse direction, and is grounded to GND via an output terminal 59 and further via a relay coil of the power relay 29. This power relay 29
One terminal of the contact a is connected to the positive electrode, the other terminal is connected to one terminal of the compressor 30, and the other terminal of the compressor 30 is grounded to GND. An air horn 31 is connected to the compressor 30 via, for example, an air hose.

The operation of the circuit having the above configuration is as follows. The input terminal 52 is grounded to GND via the horn switch 5, and when the horn switch 5 is pressed, the input terminal 52 is grounded to GND and the transistor 54 is turned on. State. When the transistor 54 is turned on, a collector current flows, the capacitor 56 is rapidly charged, and the potential of the node between the resistor 55 and the capacitor 56 rises. Then, the output state of the comparator 57 is inverted to a low level,
The transistor 58 is turned on. Therefore, the coil of the power relay 29 is excited to close the a-contact, and the battery voltage is supplied to the compressor 30. Therefore,
Compressor 30 is driven and compressed air is supplied to air horn 31
And a blow sound is output. In this circuit, even when the pressed horn switch is pressed for a short time, the rapidly charged capacitor 56 discharges, so that the potential of the node between the resistor 55 and the capacitor 56 is maintained high for a predetermined time. , The compressor 30 can be driven for a predetermined time.

In the circuit having the above configuration, the input terminal 52
4B is operated by being grounded to GND, that is, since the circuit is designed corresponding to the horn switch 5 which is generally connected as a low-side switch, FIG. Horn relay 2 as shown in
When mounting on a vehicle without the mark, remove the terminal on the horn switch side of the horn 1 (portion indicated by 61 in the figure),
It is only necessary to connect the horn switch 5 and the input terminal 52.

However, when the horn is mounted on a vehicle equipped with a horn relay 2 as shown in FIG. 4 (a), the horn relay 2 side terminal of the horn 1 (portion 61 in the drawing) is removed. When the relay 2 is connected to the input terminal 52, the potential of the horn relay 2 becomes positive when the contact a is closed, and the input terminal 5 which should be grounded to GND.
There is a problem that the polarity differs from that of 2. Therefore, it is conceivable to cut the cable connecting the relay coil of the horn relay 2 and the horn switch 5 and connect the input terminal 52 to the horn switch 5.
Is generally housed in a relay unit together with a plurality of other relays, and the output from the unit (indicated by 62 in the figure) is taken into the vehicle interior through a harness in which a plurality of cables are integrated. Therefore, it is presently very difficult to cut this cable in the engine room. Therefore, the cable connected to the input terminal 52 must be routed from the engine room to the vehicle interior and connected near the horn switch 5 (the portion indicated by 63 in the figure). Was rare.

In view of the problems of the prior art, a main object of the present invention is to determine whether an existing horn is connected to a negative pole of a power supply by turning on a horn switch to output a blow sound, Conversely, whether the horn switch is turned on and connected to the positive pole of the power supply to output a blow sound, the air horn control device can be connected without considering the polarity and can output a sufficient blow sound. Is to provide.

[0013]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is achieved in that the potential is changed in conjunction with the connection of an existing horn switch.
The potential of the changing point α (terminal 6 in the description of the embodiment) is
Monitors and detects when the contact of the horn switch is closed.
In order to output a blowing sound by driving the compressors, existing ho
A control apparatus for air horn which is retrofitted by replacing the over down, the potential of the point α is linked to the connection of the horn switch
Circuit, one input terminal is connected to point α.
A first connection mode in which the other input terminal is grounded in advance;
The potential at point α goes low in conjunction with the connection of the horn switch.
Circuit, connect one input terminal to point α,
And the second connection mode in which the input terminal of
End in the description of the two floating input terminals (examples may-option
Terminals 8, 11) and a ground terminal (terminal 2 in the description of the embodiment ).
Have a input end consisting of a 6), first connection mode when retrofitting
And the second connection mode, the air horn system
Connect the drive switch of the control circuit to the circuit configuration of the existing horn.
However, it can be operated in conjunction with the connection of the horn switch.
This is attained by providing an air horn control device characterized by the above. Further, it is more preferable to have a delay circuit for delaying the fall of the contact signal from the horn switch input to the input terminal for a predetermined time.

[0014]

In this way, since the two floating input terminals at the input terminals of the control device can be connected in either positive or negative polarity, the connection can be made without considering the polarity, for example, an existing horn. Power supply line. Also, by having a delay circuit,
Since the fall of the input signal can be delayed, the power supply voltage can be supplied to the compressor for a predetermined time even when the horn switch is turned off in a short time.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is an electric circuit diagram showing an air horn control device to which the present invention is applied, which is mounted on, for example, an automobile. The horn 1 is connected to the positive electrode of a battery 4 via a contact of a horn relay 2 and further via a fuse 3. The negative pole of this battery 4 is G
In addition to being grounded to ND, the positive pole is grounded to GND via a relay coil of the horn relay 2 and further via a horn switch 5. The horn 1, the horn relay 2, the fuse 3, the battery 4, and the horn switch 5 are provided in advance in an automobile.

Next, to a terminal 6 provided between the horn 1 and the horn relay 2, a terminal 8 which is one floating input terminal of an air horn control device 7 is connected via a connection cable 9. I have. Terminal 8 is an air horn relay 10
Is connected to the terminal 11 which is the other floating input terminal through the relay coil. The positive electrode of the battery 4 is connected to the terminal 12 and the resistor 13, and further connected to the a contact of the air horn relay 10 and the resistor 14 in this order.
D is grounded. Further, a node between the a contact of the air horn relay 10 and the resistor 14 is grounded to GND via a resistor 15 and a capacitor 16 as a delay circuit.

The node between the resistor 15 and the capacitor 16 is connected to the inverting input terminal-of the comparator 18. The non-inverting input terminal + of the comparator 18 is connected to the terminal 12 via the resistors 19 and 13 and is also grounded via the resistor 20 to GND. The output terminal of the comparator 18 is connected via a resistor 21 to a non-inverting input terminal +, and the resistors 22, 23,
13 is connected to the terminal 12.

The base of a PNP transistor 24 is connected to the nodes of the resistors 22 and 23. The emitter of the transistor 24 is connected to the terminal 12, and the collector is connected through a diode 25 in the reverse direction. GND
Grounded. The terminal 11 is connected to the terminal 26 serving as a ground terminal via a short bar 27.

The collector of the transistor 24 has:
It is grounded via a terminal 28 and further via a relay coil of a power relay 29 to GND. The positive contact of the battery 4 is connected to one of the a contacts of the power relay 29, and the other terminal is connected to one terminal of a compressor 30. The other terminal of the compressor is connected to GND.
Grounded. An air horn 31 is connected to the compressor 30 via, for example, an air hose.

Next, an assembling procedure of the air horn control device having the above configuration and an operation procedure thereof will be described.

First, the air horn 31 and the compressor 3
0, air horn control device 7, and power relay 2
9. All of these are installed at appropriate positions in the engine room. Then, the lead wire on the positive electrode side of the horn 1 is removed from the terminal 6 , and power is supplied to the horn 1 as shown by the mark x in FIG.
Disconnect feeder. Next, the terminals 6 and 8 are short-circuited by the connection cable 9. Further, the positive electrode of the battery 4 and the terminal 1
2 and the a contact of the power relay are connected. Then, the terminals 11 and 26 are short-circuited by the short bar 27. In this way, it can be easily connected to the electric circuit of the existing horn 1, and all operations can be performed in the engine room.

Next, the horn switch 5 is depressed to output a blow sound from the air horn 31. In this case, when the horn switch 5 is pressed, the relay coil of the horn relay 2 is excited, and the contact a of the relay is closed. Then
The relay coil of the air horn relay 10 is excited via the positive pole of the battery 4, the a contact of the horn relay, the cable 9, and the terminal 8. And the air horn relay 10
Is closed, the capacitor 16 is rapidly charged, and the potential of the node between the resistor 15 and the capacitor 16 rises, so that the output of the comparator 18 is inverted to a low level. Then, a current flows between the emitter and the collector of the transistor 24. This current excites the relay coil of the power relay 29, closes its a contact, and supplies the voltage of the battery to the compressor 30. When the compressor 30 operates, air is supplied to the air horn 31 and a blow sound is output.

In the above operation, even when the horn switch 5 is turned on for a short time, the output state of the comparator 18 (in this case, the low level state) is held for a predetermined time by the time constant of the resistor 15 and the capacitor 16. Accordingly, the air horn 31 can output the blow sound for the predetermined time.

Next, FIG. 2 is an electric circuit diagram showing an embodiment in which the product of the present invention is mounted on a vehicle without the horn relay 2, and the same parts as those in FIG. Is omitted. This circuit differs from the circuit shown in FIG. 1 in that a short bar 27 that has short-circuited the terminals 11 and 26 is connected between the terminals 11 and 12. That is, the terminal 6 is the horn switch 5 in the circuit of FIG.
Is pressed to have the same potential as the positive pole of the battery 4, but in the circuit of FIG. 2, it has the same potential as the negative pole of the battery. Therefore, the terminal 8 has the same potential as the negative pole of the battery 4 when the horn switch 5 is pressed, but since the terminal 11 is connected to the positive pole of the battery, the terminals 8 and 1 have the same potential.
A potential difference can occur between the two. Therefore, by pressing the horn switch 5, the same operation as the circuit of FIG. 1 can be performed.

FIG. 3 is an electric circuit diagram showing another embodiment of the present invention. This circuit is different from the above-mentioned respective circuits in that four diodes 41 to 44 are provided between terminals 8 and 11.
A diode bridge rectifier circuit 45 composed of
The resistors 46 and 47 are connected to the output terminals. An NPN transistor 4 is connected to the nodes of the resistors 46 and 47.
8 base is connected and its collector is
It is connected to the positive pole of the battery 4 via 9, 50 and the resistor 13. The emitter of the transistor 48 is connected to the terminal 11 via the diode 44 in the forward direction.

The base of a PNP transistor 51 is connected to the nodes of the resistors 49 and 50, the emitter is connected to the terminal 12 via the resistor 13, the collector is connected via the resistor 14, and the terminal GND via 26
Grounded. The circuit in the subsequent stage of the transistor 51 is the same as the circuits in FIGS. 1 and 2 described above, and thus detailed description is omitted.

An assembling procedure of the control device thus configured and an operation procedure thereof will be described. Connection of each terminal is the same as that of the circuit of FIG. That is , from the terminal 6 to the horn 1
And the terminals 6 and 8 are short-circuited via the connection cable 9, and the terminals 11 and 26 are short-circuited via the short bar 27. Next, when the horn switch 5 is pressed, the terminal 8 and the positive electrode of the battery 4 are connected, and the diode 41, the resistors 46 and 47, the diode 44, the terminal 11, the show bar 2
7, a current flows in the order of GND, the transistor 48 is turned on, and the transistor 51 is turned on. Then, the capacitor 16 is rapidly charged, and the potential of the node between the resistor 15 and the capacitor 16 rises, so that the output of the comparator 18 is inverted to a low level. Hereinafter, the same operations as those of the above-described circuits are performed, and the blow sound is output from the air horn 31.

When the control device shown in FIG. 3 is installed in a vehicle in which the horn relay 2 is not installed, similarly to the control device shown in FIGS.
The short bar 27 that has short-circuited the terminals 6 is connected to the terminals 11 and 12.
The same operation can be performed by connecting them in between.

As is apparent from the above-described embodiments, since the terminals 8 and 11 can be connected to either the positive or negative polarity, power is supplied to the horn 1 regardless of the presence or absence of the horn relay 2. The line can be cut off, and the input end of the control device 7 can be connected to that part. Therefore, all operations can be performed in the engine room.

[0031]

As is apparent from the above description, according to the air horn control device of the present invention, since the input terminal has two floating input terminals, it is not necessary to consider the polarity of these terminals. Therefore, since the polarity of the circuit to be connected is not selected, for example, since the lead wire of the existing horn which can be easily found can be cut and connected at the cut portion, all work in the engine room can be performed. Yes, there is no need to perform line work from the engine room to the vehicle interior as before,
An air horn can be easily installed in place of the existing horn. Further, since the fall of the input signal can be delayed by the delay circuit and the power supply voltage can be supplied to the compressor for a predetermined time, it is possible to provide an air horn capable of outputting a sufficient blowing sound. From the above, the effect of the present invention is great.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an air horn control device to which the present invention is applied.

FIG. 2 is an electric circuit diagram showing another embodiment of the air horn control device.

FIG. 3 is an electric circuit diagram showing another embodiment of the air horn control device.

FIG. 4 is an electric circuit diagram showing an existing horn control device.

FIG. 5 is an electric circuit diagram showing a state where an air horn is connected to FIG. 4;

FIG. 6 is an electric circuit diagram showing a conventional air horn control device.

[Explanation of symbols]

 Reference Signs List 1 horn 2 horn relay 3 fuse 4 battery 5 horn switch 7 air horn control device 8, 11 terminal 9 connection cable 10 air horn relay 12, 26, 28 terminal 14 resistor 15 capacitor 18 comparator 24 transistor 27 short bar 29 power relay 30 compressor 31 air horn 45 rectifier circuit

Claims (2)

(57) [Claims] 1. Interlocking with the connection of an existing horn switch
Monitor the potential at the point α where the potential changes, and
Upon detection of the closing of the contacts of order and outputs a blowing sound by driving the compressor, a control device for air horn which is retrofitted by replacing the existing horn, the potential of the point α is the connection of the horn switch In conjunction
In the case of a circuit that goes high, one input terminal is connected to the point α.
A first connection state in which the other input terminal is connected in advance and grounded
And the potential of the point α interlocks with the connection of the horn switch.
In the case of a circuit that goes low, one input terminal is connected to the point α.
Connected, and the other input terminal is connected to the high side in advance.
Have a input for two floating input terminal capable of selecting the second connection mode to consist the ground terminal, to select the said second connection mode between said first connection mode when retrofitting
Select the drive switch of the air horn control circuit by selecting
The horn, regardless of the circuit configuration of the existing horn
An air horn control device characterized in that it can be operated in conjunction with connection of a switch . 2. The air horn control device according to claim 1, further comprising a delay circuit for delaying a fall of a contact signal of the horn switch input to the input terminal by a predetermined time.