JPS623284Y2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a device for controlling switching between inside and outside air in an air conditioner for an automobile. A conventional control device for switching between inside and outside air in an automobile air conditioner is shown in FIG. That is, in the conventional control device, switching between inside and outside air is performed using two dampers 1 and 2, and one of the dampers 1 is actuated by the intake negative pressure by the actuator 3, and the intake negative pressure circuit 4 of the actuator 3 is operated. Vacuum switching valve (hereinafter referred to as VSV) 5
The VSV5 is separated from the power supply battery 6 in the electric circuit that operates the VSV5.
On the power supply side, a circuit 9 has a diode 7 and an indoor air mode switch 8 that can completely air the air in the indoor air mode, and a series circuit 13 consisting of a vent mode switch 10 and a blower switch 12 that is turned on at the high speed side of the blower motor 11. ON when flows
A circuit 17 in which a relay 14, a diode 15, and an air conditioner switch 16 are connected in series.
It consists of circuits connected in parallel.
In addition, in FIG. 1, the blower switch 12 is
Hi represents high speed, M ₂ and M ₁ represent medium speed, and LO represents low speed, 18 represents the amplifier amplifier of the air conditioner, 19 represents the compressor of the air conditioner, 20 represents the circuit breaker, and 21 represents the air conditioner compressor.
is the ignition switch, 22 is another load, 23
indicates another switch. In a conventional device having such a circuit configuration, diodes 7 and 1 are used to prevent current from flowing around.
5 was required, which inevitably led to higher costs. There was also the problem that the safety of the electric circuit was reduced because the load from the VSV 5 was not on the power supply 6 side. In order to solve these problems with conventional control devices, the present invention aims to reduce costs and simplify the circuit by removing the diode from the VSV electrical circuit, and also connects the load consisting of the VSV to the power supply side. The purpose is to improve the safety and reliability of circuits. The internal/external air control device for an automobile air conditioner according to the present invention, which meets this objective, is equipped with two dampers for switching between internal and external air, and a vacuum switch is installed in the intake negative pressure passage of the actuator that operates one of the dampers. A valve is provided, and the vacuum switching valve is connected to the power supply side of the electric circuit for operating the vacuum switching valve, and the inside air that can be completely brought into the room during the inside air mode is connected to the side opposite to the power supply side of the vacuum switching valve. ON at mode switch circuit, vent mode switch and high speed side
It consists of a series circuit of blower switches connected in parallel. In this circuit configuration, a relay may be further provided in the series circuit of the vent mode switch and the blower switch motor to turn on when the air conditioner is turned on. In the circuit configured in this way, the diode is removed, and the VSV is located on the power supply side of the various switches. As a result, circuit costs are reduced and reliability and safety are improved. DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the internal/external air control device for an automobile air conditioner according to the present invention will be described below with reference to the drawings. FIG. 2 shows a first embodiment of the invention. In the figure, 30 and 31 indicate two dampers. When the damper 30 is in the position indicated by the solid line in the figure, the damper 3
The inside air suction port 32 on the side where 0 is attached is open and closed at the position indicated by the broken line. Further, when the damper 31 is in the position shown by the solid line in the figure, the inside air suction port 33 on the side where the damper 31 is attached is closed, and when it is in the position shown by the broken line, it is open. When both dampers 30 and 31 are open, the outside air inlet 34 is fully closed, when both are closed, the outside air inlet is fully open, and when one is open, the outside air inlet is 1/2 open. becomes. One of the dampers 30 and 31 is opened and closed by an actuator 35. The actuator 35 has a diaphragm (not shown), and its operation is performed by introducing negative intake pressure. That is, when the intake negative pressure is guided to the actuator 35, the actuator 35 pulls the link of the damper 30, opening the damper 30. Further, when the intake negative pressure is cut off, the damper 30 is closed. Intake negative pressure passage 3 to actuator 35
6 is provided with a VSV 37, which communicates and cuts the intake negative pressure. In the electrical circuit for VSV37 operation, 38 is a battery, 39 is a fusible link, 40 is an ignition switch, and 41 is a fuse, and immediately after that, VSV37 is installed closer to the power source than other switches. . Immediately after VSV 37, the circuit branches into two parallel circuits, one circuit 42 is connected to ground 44 via shy mode switch 43.
has been done. The other circuit 45 consists of a series circuit of a vent mode switch 46 and a blower switch 47, and is connected to ground 48 via the blower switch 47. Also, the circuit is fuse 41 and VSV37
The branch circuit is connected to a blower switch 47 via a main relay 48. On the other hand, the electric circuit of the air conditioner includes a battery 38, a fusible link 49, a circuit breaker 50, a main relay 48, a fuse 51,
It consists of a series circuit of an air conditioner switch 52, an air conditioner amplifier amplifier 53, an air conditioner compressor 54, and a ground 55. The circuit branches between a main relay 48 and a fuse 51, the branch circuit is connected to a blower switch 47, and a blower motor 56 is provided on the branch circuit. The blower motor is a blower motor for driving a blower 57 shown in the dampers 30 and 31 section. Blower switch 47 has high speed Hi, medium high speed _M2 , and medium speed.
It is possible to selectively take the following states: M ₁ , low speed LO, and OFF, and the illustrated example is
This shows the case in Hi state. FIG. 3 shows a second embodiment of the present invention, and shows an alternative circuit to the electric circuit surrounded by the two-dot chain line in FIG. In FIG. 3, a relay 58 is provided between the vent mode switch 46 and the blower switch 48.
is when the air conditioner switch 52 is turned on and current flows through the air conditioner circuit.
It is connected so that it is ON. The rest of the structure is similar to that of the first embodiment, so the same parts are given the same reference numerals as in FIG. 2. Next, the operation of the device of the present invention will be explained.
First, the vent mode of the first embodiment is displayed as follows.

[Table] To explain the above table, when the heater control lever is set to indoor air mode switch 4
3 is ON, current flows through the VSV 37, guiding the intake negative pressure to the actuator 35 and opening the damper 30. Since the other damper 31 has already been pulled by a cable (not shown) and is in the open position when switching to inside air, both dampers 30 and 31 are opened, cutting off outside air and providing a complete inside air condition. In this case, regardless of the state of the blower switch 47, current flows through the circuit 42, so the VSV 37 continues to operate and the state of complete indoor air is maintained. Furthermore, when the heater control lever is turned to outside air, the inside air mode switch 43 is turned off and no current flows through the circuit 42. At this time, when the blower switch 47 is in the OFF, LO, _M1 position, the circuit 45 is not electrically connected to the ground 48, so no current flows through the circuit 45, and therefore,
No current flows through VSV37. Therefore, the actuator 35 does not operate and the damper 30 closes.
Since the other damper 31 is already in the closed state when the heater control lever is switched to outside air, both dampers 30 and 31 are in the closed position after all, and a complete outside air condition is obtained. Next, when the heater control lever is in the outside air position and the blower switch 47 reaches a high speed of M2 _or Hi, the circuit 45 becomes conductive to the ground 48 through the blower switch 47, and current flows through the circuit 45. A current flows through the VSV 37, leading to negative intake pressure to the actuator 35, and opening the damper 30.
At this time, the other damper 31 is closed when the heater control lever is set to the outside air position and remains in that state, so only one damper 30 opens and the air is 1/2 inside. Become.
Therefore, only when the blower is running at high speed, the inside of the vehicle can be efficiently cooled in the outside air mode with some inside air mixed in without reducing the air conditioner performance. In this state, the shyness mode switch 42 is OFF and the ignition switch 4 is OFF.
0 is ON, air conditioner switch 52 is
ON, the vent mode switch 46 is ON, and the blower switch is in the Hi or _M2 state, as shown in FIG. It is also an object of the present invention to provide a device that can achieve this state. Next, regarding the vent mode of the second embodiment, it is the same as the vent mode of the first embodiment only when the air conditioner switch 52 is ON. This is air conditioner switch 52.
This is because when the air conditioner is turned ON and the air conditioner is operating, the relay 58 is turned ON and the circuit shown in FIG. 3 becomes substantially the same as the circuit shown in FIG. In the second embodiment, the vent mode when the air conditioner switch 52 is turned off is as follows.

[Table] As shown in the table above, the air conditioner is OFF.
In this case, unlike the 1/2 inside air in the first embodiment, it is completely outside air, but since the air conditioner is turned off, there is no need to increase the cooling capacity and it may be completely outside air. As described above, the following various effects can be obtained when using the inside/outside air control device of the automotive air conditioner of the present invention. First, in both the first and second embodiments, no diode is used in the VSV control electric circuit;
In addition to reducing costs, the circuit configuration is also simplified, further reducing costs. In addition, since the load consisting of VSV is placed on the power supply side and each switch is placed on the ground side, it is highly safe for body shots and the like. Furthermore, when the blower speed is high, that is, in the above-mentioned M ₂ or Hi state, the vent mode can be set to 1/2 indoor air, and the cooling capacity of the air conditioner is higher with indoor air than with outdoor air. Since the air conditioner capacity is high, the air conditioner capacity can be kept high. In other words, only when the blower is running at high speed, the air conditioner is operated in an outside air mode with some inside air mixed in without reducing the air conditioner's ability. This simplifies the control system, making it less expensive, and improving the safety and reliability of the circuit. can improve sex.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional air conditioner control device for an automobile, and FIG. 2 is a circuit diagram of an air control device for an automobile air conditioner according to a first embodiment of the present invention.
FIG. 3 is a partial circuit diagram of an inside/outside air control device for an automobile air conditioner according to a second embodiment of the present invention. 30, 31... Two dampers, 35... Actuator, 36... Intake negative pressure passage, 37...
VSV, 38...Battery, 40...Ignition switch, 43...Shy mode switch, 4
6... Vent mode switch, 47... Blower switch, 48... Main relay, 52... Air conditioner stationer switch, 54... Air conditioner compressor, 56... Blower motor, 57
...Blower, 58...Relay.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Two dampers are provided for switching between inside and outside air, and a vacuum switching valve is provided in the intake negative pressure passage of an actuator that operates one of the dampers, The switching valve is connected to the power supply side of the electric circuit for operating the vacuum switching valve, and on the side opposite to the power supply side of the vacuum switching valve, there is an internal air mode switch circuit that allows complete internal air in the internal air mode, and a vent mode switch circuit. This internal/external air control device for an automobile air conditioner is characterized by a circuit connection in parallel between a switch and a series circuit of a blower switch that is turned ON on the high speed side. (2) The inside/outside air control device for an automobile air conditioner according to claim 1, wherein a relay is provided in the series circuit of the vent mode switch and the blower switch to turn on when the air conditioner is turned on.