JP2565869Y2 - Control circuit of pneumatic automatic door for automobile - 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 circuit for a pneumatic automatic door for an automobile which prevents the door from being moved by an external force when the door is opened and closed.

[0002]

2. Description of the Related Art Conventionally, a door of a vehicle such as a bus has been designed so that an occupant such as a driver can remotely open and close the door to reduce labor. Automatic doors are known.

However, in the control circuit of the pneumatic automatic door for an automobile, if the open / close switch S1 is returned to the neutral state with the door closed, the solenoid valve V2 is communicated with the atmosphere and the cylinder head a1 of the door engine a is opened. Is opened to the atmosphere, while the passage b between the solenoid valves V1, V2, and V3 is closed on the cylinder tail side a2 because the passage b between the solenoid valve V3 and the cylinder tail side a2 is closed.
Due to the remaining negative pressure, the piston a3 of the door engine a moves in the direction to open the door, and has a disadvantage that the door cannot be completely closed despite the fact that it is originally closed,
Also, in this state, the cylinder head side a of the door engine a
1. Since the cylinder tail side a2 is at atmospheric pressure,
When an external force such as wind pressure during traveling is applied to the door, the door easily moves and has a drawback that a fluttering sound is generated during traveling.

When the door is opened, the open / close switch S1 is opened.
When returning to neutral, contrary to the above,
Negative pressure remaining in the passage b (hatched portion) of the solenoid valves V1, V2, V3 causes the piston a3 of the door engine a to move in a direction to close the door, and the door a is completely opened despite being originally open. It has a drawback that it cannot be performed, and the door can easily move when an external force is applied to the door, and the holding function is impaired.

[0005]

[Problems to be Solved by the Invention] The present invention prevents the door from moving due to external force after opening and closing, eliminates noise (when closed), and has a stop holding function (when opened) to improve safety. It is intended to provide a control circuit for a pneumatic automatic door.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the problem of the door movement due to external force after opening and closing based on the above-mentioned prior art, and always keeps one of the ports of the door engine closed even after opening and closing. To provide a control circuit for a pneumatic automatic door for automobiles that aims to provide a resistance to external force, eliminate the movement of the door to prevent noise, and provide a stop holding function to improve safety. This is to eliminate the above disadvantages.

The control circuit for a pneumatic automatic door for a vehicle according to the present invention comprises a power control circuit and an electric control circuit.

The power control circuit operates the opening / closing door. First and second three-port solenoid valves are interposed between the pressure source and the open port and the closed port of the door engine, respectively. A two-port solenoid valve is interposed between the first and second three-port solenoid valves and the pressure source, and the first and second three-port solenoid valves allow the open port and the closed port to communicate with the atmosphere or a pressure source. On the other hand, the passage between the pressure source and the first and second 3-port solenoid valves is communicated or blocked by the 2-port solenoid valve.

The electric control circuit controls the first and second 3-port solenoid valves and the 2-port solenoid valve in the power control circuit to shut off the passage to the open side port or the close side port in the door engine. The door is always pressed by the door engine in the same direction, and the first relay and the solenoid of the two-port solenoid valve are connected so that power is supplied to the open contact of the neutral return type two-way switch. The second relay and the solenoid of the 2-port solenoid valve are connected so as to conduct electricity at the contacts, and the 2-port solenoid valve, the first relay, and the second
The relay is operating.

A make contact side of the first relay and a break contact side of the second relay are interposed in series between the solenoid of the first three-port solenoid valve and the first relay and the power supply, and a two-way switch is provided. The first three-port solenoid valve is operated even in the neutral position.

A break contact side of the first relay is interposed between the solenoid of the second three-port solenoid valve and the power source, and the second three-port solenoid valve is operated even when the two-way switch is in the neutral position. .

[0012]

According to the present invention, the closing contact of the two-way switch is connected to energize the solenoid of the second relay and the two-port solenoid valve, and the second relay is connected to the break contact of the first relay. The solenoid of the port solenoid valve is energized to communicate the pressure source with the closed port of the door engine, and the first 3 port solenoid valve is deactivated to open the open port to the atmosphere and close the door engine. Operate in the direction.

When the two-way selector switch is returned to the neutral position from the above state, the power supply to the solenoid of the two-port solenoid valve is cut off, and the power supply to the solenoid of the second three-port solenoid valve is turned off by the first relay. Since the port is maintained via the break contact side and the open side port is also kept open to the atmosphere, the closed port of the door engine is closed and the stopped state of the door engine is maintained.

Next, the open side contact of the two-way selector switch is connected to energize the solenoid of the two-port solenoid valve, the solenoid of the first three-port solenoid valve is energized, and the first relay is also energized to make up. It is switched to the contact side, the energization of the solenoid of the second 3 port solenoid valve is cut off, the opening port of the door engine communicates with the pressure source, and the closing port is opened to the atmosphere to open the door engine in the opening direction. Activate.

When the two-way selector switch is returned to the neutral position from the above state, the energization of the solenoid of the two-port solenoid valve is cut off, and the energization of the solenoid of the first three-port solenoid valve is performed by the make-up of the first relay. The contact port is maintained through the break contact side of the second relay, and the closing port is also kept open to the atmosphere, so that the opening port of the door engine is sealed and the stopped state of the door engine is maintained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The control circuit 1 includes a power control circuit 4 and an electric control circuit 5.

The power control circuit 4 operates a first branch pipe 9 branched from a main pipe 8 from a pressure source 7 comprising a pressure reducing tank connected to a vacuum pump 6 by air pressure (negative pressure in this embodiment). A second branch pipe 12 branched from the main pipe 8 is connected to a closing port 13 of the door engine 10 while being connected to an opening port 11 of the door engine 10 composed of an air cylinder.

The main pipe 8 is provided with a two-port solenoid valve 14 for communicating or shutting off the main pipe 8, and the first branch pipe 9 has an open port 11 connected to the atmosphere or the pressure source 7. A first three-port solenoid valve 15 for communication is provided, and a second three-port solenoid valve 16 for connecting the closed port 13 to the atmosphere or the pressure source 7 is provided in the second branch pipe 12.

The electric control circuit 5 has an ignition switch 18 as a main switch and a fuse
A neutral position return type two-way switch 20 is connected via 19, and the close contact 20a of the two-way switch 20 is connected to ground via a second relay 21 and is connected in the forward direction. A diode 22, a solenoid 14a of the two-port solenoid valve 14, a diode 23 connected in the forward direction, and an emergency switch 24 are connected to the ground.

The open contact 20b of the two-way selector switch 20
Is connected to the solenoid 14a of the two-port solenoid valve 14 via the diode 25 connected in the forward direction, and is connected to the solenoid 15a of the first three-port solenoid valve 15 by branching off from the diode 26 connected in the forward direction. Connected between the emergency switch 24 and the diode 23 via the diode 27 connected in the forward direction, the other is connected between the emergency switch 24 and the diode 23 via the first relay 28 and the diode 29 connected in the forward direction. Connected.

The common side 20c of the two-way selector switch 20
Is connected to the common side 28a of the relay contact of the first relay 28, and the break contact side 28b of the relay contact is connected to the solenoid 16a of the second 3-port solenoid valve 16 and the emergency switch via the diode 30 connected in the forward direction. 24 and diode 23
Connected between

The make contact side 28c of the relay contact of the first relay 28 is connected to the common side 21a of the relay contact of the second relay 21, and the break contact side 21b of the relay contact is connected to the diode 26 and the first relay 28. Connected between.

Next, the operation of the control circuit for a pneumatic automatic door for a vehicle according to the present invention will be described. First, when the door 3 is closed, the two-way switch 20 is switched to connect the closing contact 20a to the DC power supply. By connecting to 17, the second relay 21 is energized, the solenoid 14 a of the two-port solenoid valve 14 is also energized via the diode 22, and the main pipe 8 is communicated by the operation of the two-port solenoid valve 14. On the other hand, since the first relay 28 is not energized, the first relay 28
Current flows through the break contact side 28b of the second 3 port solenoid valve
The solenoid 16a of 16 is energized, whereby the second 3 port solenoid valve 16 is operated to connect the closing port 13 with the pressure source 7 and to apply a negative pressure to the cylinder head side 10a of the door engine 10 through the closing port 13. The piston 10c is extended to the arrow A side.

In this state, since the solenoid 15a of the first three-port solenoid valve 15 is not energized, the solenoid 15a of the door engine 10
10b is open to the atmosphere.

When the two-way selector switch 20 is returned to neutral from the above state, the solenoid 14 of the two-port solenoid valve 14
a to the main pipe 8
Is shut off, while the solenoid 16 of the second 3-port solenoid valve 16 is closed.
a is maintained through the break contact side 21b of the first relay 28, and the cylinder tail side 10b of the door engine 10 is also open to the atmosphere, so the cylinder head side 10a of the door engine 10 is closed. As a result, the stopped state of the piston 10c is maintained.

Next, when the door 3 is opened, the two-way switch 20 is switched to connect the open-side contact 20b to the DC power supply.
17, the solenoid 14 a of the two-port solenoid valve 14 is energized via the diode 25, and the main pipe 8 is communicated by the operation of the two-port solenoid valve 14, while the first third port is connected via the diode 26. Solenoid 15 for solenoid valve 15
a is energized and the first three-port solenoid valve 15 operates to
The branch pipe 9 communicates and the first
The relay 28 is also energized, the relay contact of the first relay 28 is switched to the make contact side 28c, the energization to the solenoid 16a of the second 3 port solenoid valve 16 is cut off, and the cylinder head 10a of the door engine 10 is turned off. As a result, the first branch pipe 9 and the pressure source 7 are communicated with each other, so that the cylinder tail side 10b of the door engine 10 has a negative pressure and the piston
10c is retracted in the direction of arrow B.

When the two-way selector switch 20 is returned to neutral from the above state, the solenoid 14 of the two-port solenoid valve 14
a, the main pipe 8 is cut off by the two-port solenoid valve 14, and the first relay 28 connects the make contact side 28c of the first relay 28 and the break contact side 21b of the second relay 21. Power (self-holding), the power to the solenoid 15a of the first 3-port solenoid valve 15 is maintained, so the cylinder tail side 10b of the door engine 10
Is closed, and the stopped state of the piston 10c is maintained.

[0028]

[Effects of the Invention] In short, the present invention interposes first and second three-port solenoid valves 15 and 16 between the pressure source 7 and the open side port 11 and the closed side port 13 of the door engine 10, respectively. The first and second three-port solenoid valves 15, 16 and the pressure source 7
Power control circuit 4 with a two-port solenoid valve 14 interposed between
And a first relay 28 and a two-port solenoid valve so as to energize at the open side contact 20b of the neutral return type two-way switch 20.
The solenoid 14a of the two-way selector switch 20 is connected, and the second relay 21 and the solenoid 14a of the two-port solenoid valve 14 are connected so as to be energized at the close contact 20a of the two-way selector switch 20. Between the power supply 17 and the solenoid 15a of the first relay 28 and the make contact side 28 of the first relay 28.
c, a break contact 21b of the second relay 21 is interposed in series, and a break contact 28b of the first relay 28 is interposed between the solenoid 16a of the second 3-port solenoid valve 16 and the power supply 17. After the door engine 10 is operated in the closing direction with the two-way switch 20 closed (the contact 20a is closed), the two-way switch
When 20 is returned to neutral, the first three-port solenoid valve 15 is deactivated, the second three-port solenoid valve 16 is activated, and the two-port solenoid valve 14 is deactivated. The door engine 10 can be kept closed, and the door engine 10 can be kept stopped. Similarly, after the two-way switch 20 is opened (the open-side contact 20b is connected) and the door engine 10 is operated in the opening direction, When the directional switch 20 is returned to the neutral position, the first three-port solenoid valve 15 is activated, the second three-port solenoid valve 16 is deactivated, and the two-port solenoid valve 14 is deactivated. Cylinder tail side 10
b is closed, and the stopped state of the door engine 10 can be held, so that noise caused by flapping due to external force when the door is closed as in the related art is eliminated, and the movement of the door when the door is opened is regulated to provide a stop holding function. Thus, the practical effect is extremely large, for example, the safety of ascending and descending can be secured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a door is closed in a control circuit of a pneumatic automatic door for an automobile according to the present invention.

FIG. 2 is a diagram illustrating a state in which a two-way switch is set to a neutral state after a door is closed.

FIG. 3 is a diagram showing a state in which a door is opened in a control circuit of a pneumatic automatic door for an automobile.

FIG. 4 is a diagram showing a state in which a two-way selector switch is set to a neutral position after the door is opened.

FIG. 5 is a schematic perspective view of a vehicle such as a bus having a double-folded opening / closing door.

FIG. 6 is a diagram showing a state in which a switch is returned from a closed position to a neutral position in a conventional control circuit.

[Explanation of symbols]

 4 Power control circuit 5 Electric control circuit 7 Pressure source 10 Door engine 11 Opening port 13 Closed port 14 2-port solenoid valve 14a solenoid 15 1st port solenoid valve 15a solenoid 16 2nd port solenoid valve 17 DC power supply 20 2 Direction switch 20a Close contact 20b Open contact 21 Second relay 21b Break contact 28 First relay 28b Break contact 28c Make contact

Claims (1)

(57) [Scope of request for utility model registration] A first and a second three-port solenoid valve are interposed between a pressure source and an open port and a closed port of a door engine, respectively. A power control circuit having a two-port solenoid valve interposed between the power source and a solenoid connected to the first relay and the two-port solenoid valve so that power is supplied to the open-side contact of the neutral return type two-way switch; The second relay and the solenoid of the 2-port solenoid valve are connected so as to energize at the close contact of the two-way selector switch, and the first relay is connected between the solenoid of the first 3-port solenoid valve and the first relay and the power supply. An electric control circuit in which a make contact side of the relay and a break contact side of the second relay are interposed in series, and a break contact side of the first relay is interposed between a solenoid and a power supply of the second 3-port solenoid valve. Consisting of And a control circuit for a pneumatic automatic door for an automobile.