JPS6215362B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention particularly relates to a control device for an air conditioning unit for an automobile that allows forced ventilation to be performed with a single touch. Generally, in automotive air conditioning units, outside air or circulating inside air is blown out from the defroster outlet, vent outlet, and floor outlet by switching modes (see, for example, Japanese Utility Model Application Publication No. 53-88943). When it is necessary to close all windows, for example when it is raining or when the car is air-conditioned and the car is filled with cigarette smoke, forced ventilation is performed. However, with conventional forced ventilation, the blower is simply rotated at a high altitude using a manual switch, and the ventilation exhaust fan is rotated, and the mode switching is not taken into account. There is a risk of strong wind blowing, or if the outside air inlet is closed and the inside air circulation port is left open, there will be no ventilation at all, and other problems may occur, such as nicotine adhering to the heat exchanger and causing a bad odor. It was a lot. The present invention has been made in view of the above conventional problems, and includes a heat exchanger and a blower provided between an outside air inlet and an inside air circulation port, and a defroster outlet, a vent outlet, and a floor outlet. , a switching means for switching the door for opening and closing each of the openings into a plurality of modes, a mode selection means for operating the switching means, a selection means for selecting the rotational speed of the blower, and independent of the mode selection means and the selection means. a forced ventilation switch which is provided as a switch and manually operates the ventilation means; switching the forced ventilation switch gives priority to switching the mode selection means and the selection means, opens the outside air intake port and closes the inside air circulation port; A forced ventilation control means that opens the defroster outlet or the floor outlet, closes the vent outlet, and controls the blower to rotate at high speed is provided, and the device is equipped with a forced ventilation control means that controls the blower to rotate at high speed, so as to prevent strong wind blowing or forced ventilation that does not involve ventilation. This is designed to prevent harmful effects. Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the front part of the automobile is equipped with a blower duct 3 having an outside air intake port 1 leading to the outside of the vehicle and an inside air circulation port 2 leading to the interior of the vehicle at an upstream portion thereof. In the instrument panel 4 in the vehicle interior, there are a defroster outlet 5 that opens toward the front window 43, a vent outlet 6 that opens toward the chest of the occupant, and a floor outlet 7 that opens toward the floor. The rear part of the vehicle is provided with a ventilation duct 10 having an external exhaust port 8 communicating with the outside of the vehicle and an internal exhaust port 9 communicating with the interior of the vehicle. The blower duct 3 is provided with a blower 12 rotated by a blower motor 11, a cooler core 13, a heater core 14, and an air mix door 15 for opening and closing the upstream side of the heater core 14. A defroster door 17 opens and closes the defroster outlet 5, a vent door 18 opens and closes the vent outlet 6, and a floor door 19 opens and closes the floor outlet 7. The above-mentioned inside/outside air switching door 16, defroster door 1
7. The vent door 18 and the floor door 19 are provided with opening/closing devices 20, 21, 22, and 23 for opening and closing the doors 16 to 19, respectively. Each opening/closing device 20 to 23 has a diaphragm 20a
Negative pressure chambers 20b to 23 partitioned by ~23a
b and atmospheric chambers 20c to 23c, negative pressure chamber 20
b to 23b are communicated with a negative pressure source through negative pressure introducing passages 20e to 23e having electromagnetic valves 20d to 23d, and springs 20f to 23f are compressed in the negative pressure chambers 20b to 23b to supply negative pressure. Introduction passage 20
The diaphragms 20a to 23a are changed by the negative pressure introduced into the negative pressure chambers 20b to 23b from e to 23e against the spring force of the springs 20f to 23f, and the connecting arm 2 is connected to the diaphragms 20a to 23a.
Each of the above doors 16~ supported via 0g~23g
19 will be opened and closed. When the above-mentioned solenoid valves 20d to 23d are turned on, they open the negative pressure introduction passages 20e to 23e and open the atmospheric ports 20h to 23d.
23h is closed and the opposite operation is performed when it is off. A blower 25 rotated by an exhaust motor 24 is provided inside the ventilation duct 10. As shown in FIG. 2, the instrument panel 4 includes a mode select switch 26, a fan switch 27, an inside/outside air changeover switch 28, and a forced ventilation mode switch 29. The mode select switch 26 is the knob 3.
It has a movable contact 32 that slides on fixed contacts 31, ..., 31 when the knob 30 is operated.
At the VENT position, the solenoid valve 22d is turned on, the opening/closing device 22 opens the door 18 to the b position, and the BI-
At LEVEL position, solenoid valves 21d, 22d, 23d
is turned on and the opening/closing devices 21, 22, 23 open the doors 17, 18, 19 to position b, and in the HEAT position, the solenoid valves 21d, 23d are turned on and the opening/closing device 2 is opened.
1, 23 to open the doors 17, 19 to position b,
At the DEF position, the solenoid valve 21d is turned on and the opening/closing device 21 opens the door 17 to the b position. The fan switch 27 has a movable contact 35 that slides on a fixed contact 34 when a knob 33 is operated.
1 is switched from the OFF position to the position (low speed rotation), position (medium speed rotation), and position (high speed rotation). The inside/outside air changeover switch 28 has a movable contact 38 that comes into contact with a fixed contact 37 when a knob 36 is operated, and when the knob 36 is operated from the FRESH position to the REC position, the solenoid valve 20d is turned on and the opening/closing device 2
0, the inside/outside air switching door 16 is swung to position b, where the outside air inlet 1 is closed and the inside air circulation port 2 is opened. The forced ventilation mode switch 29 is operated by knob 3.
The movable contact 4 slides on the fixed contact 40 by the operation in step 9.
1, and by operating the knob 39 from the OFF position to the ON position, the exhaust motor 24 is turned on and the relay coil 42 is turned on at the same time. The relay coil 42 includes a b contact 42a that turns off the solenoid valve 20d when the relay coil 42 is turned on (setting the inside/outside air switching door 16 to the a position), and an a contact 42b that rotates the blower motor 11 at high speed.
Turn off the solenoid valves 22d and 23d (vent door 1
8. Place the floor door 19 in position a. ) b contact 4
2c, 42d, and the solenoid valve 21d are turned on (the defroster door 17 is placed in position b). A contact 42e
and. If the control device of the automobile air conditioning unit is configured as described above, the mode select switch 26 can be set to the VENT position, the BI-LEVEL position, the HEAT position, and the DEF position.
(differential) position, each opening/closing device 21, 2
2, 23, vent door 18, floor door 1
9. When the defroster door 17 is switched to the a position or the b position and the fan switch 27 is switched to the ~ position, the blower motor 11 is switched to low, medium, and high speed rotation, and when the inside/outside air changeover switch 28 is set to the FRESH position, the inside/outside air is When the switching door 16 is in the a position and the REC position, the opening/closing device 20 switches it to the b position. The mode select switch 26, the fan switch 27, and the inside/outside air changeover switch 28 can be switched in any combination as shown in the table below according to the operator's selection.

[Table] Next, when the forced ventilation mode switch 29 is switched to the ON position, the exhaust motor 24 is turned on, the relay coil 42 is turned on, and the b contact 42 is turned on.
a, 42c, 42d open, a contacts 42b, 42
e will be closed. As a result, the blower 25 of the exhaust motor 24 rotates for exhaust, and the mode select switch 2
6, fan switch 27, inside/outside air changeover switch 2
Regardless of the operating position of 8, the solenoid valve 20
When d is forcibly turned off, the inside/outside air switching door 16 swings to position a, which closes the inside air circulation port 2. When the blower motor 11 is forcibly turned on, the blower 12 rotates at high speed, while when the solenoid valves 22d and 23d are forcibly turned off, the vent door 18 is turned on. , the floor door 19 swings to the respective positions and closes, and the defroster door 17 swings to the b position and opens by forcibly turning on the solenoid valve 21d. Therefore, the outside air introduced into the air duct 3 from the outside air inlet 1 by the blower 12 is blown out into the vehicle interior from the defroster outlet 5 along the front window 43, and the inside air inside the vehicle interior is blown out through the blower 25. Accordingly, the air is introduced into the exhaust duct 10 from the internal exhaust port 9 along the rear window 44, and is discharged to the outside from the external exhaust port 8, thereby performing forced ventilation. When the air inside the vehicle compartment becomes clean due to forced ventilation and the forced ventilation mode switch 29 is switched to the OFF position, the exhaust motor 24 and the relay coil 42 are turned off, and the contacts 42a to 42e return to their original positions. Air conditioning is started again in the state in which each switch 26, 27, 28 is in the switching position. In the above embodiment, the forced ventilation mode switch 29 may be a manual switch, or may have an interlocking structure in which it is turned on for a predetermined period of time when the cigarette lighter is turned on, or it is turned on only when the ashtray is open. . Further, although forced air is forced out from the defroster air outlet 5 during forced ventilation, it may be configured to force air out from the floor air outlet 7. Note that the defroster air outlet 5 that performs forced air blowing is not limited to the one provided for the front window 43, but may also be used from the same type of air outlet provided for the side window (not shown). It may also be configured to do this. Further, in the above embodiment, the doors 16 to 19 are electrically opened and closed during forced ventilation using the relay coil 42, but a mechanical switching mechanism may also be used. As is clear from the above explanation, the present invention
In an automotive air conditioning unit, during forced ventilation, the forced ventilation switch opens the outside air inlet, closes the inside air circulation opening, and opens the defroster outlet or floor outlet, giving priority to switching the mode selection means and selection means. Since forced ventilation control means is provided to close the vent outlet and simultaneously control the blower to rotate at high speed, forced ventilation can be performed by one-touch operation of the forced ventilation control means. Therefore, forced ventilation without ventilation effect such as strong wind being blown onto the face from the vent outlet and problems caused by this are eliminated, and forced ventilation can be performed quickly and comfortably. Note that it is even more effective if the exhaust motor is operated simultaneously by the forced ventilation control means as in this embodiment.

[Brief explanation of the drawing]

Figure 1 is a side view of an automotive air conditioning unit, Figure 2
The figure is a circuit diagram of the control device of FIG. 1. 1...Outside air intake port, 2...Inside air circulation port, 3...Blower duct, 5...Defroster outlet, 6...Vent outlet, 7...Floor outlet, 8...External exhaust port, 9...Internal exhaust port, 10...Ventilation Duct, 11...Blower motor, 16...Inside/outside air switching door, 17...Defroster door, 18...Vent door, 19...Floor door, 20
~23... Opening/closing device, 24... Exhaust motor, 26... Mode select switch, 27... Fan switch,
28...Inside/outside air changeover switch, 29...Forced ventilation mode switch.

Claims (1)

[Claims] 1. A heat exchanger and a blower are provided between the outside air intake port and the inside air circulation port, and the defroster outlet, vent outlet, and floor outlet, and a switching means for switching the door that opens and closes each of the above ports to multiple modes. a mode selection means for operating the switching means; a selection means for selecting the rotational speed of the blower; and a forced ventilation switch that is provided independently of the mode selection means and the selection means and operates the ventilation means by manual operation. By switching the forced ventilation switch, the outside air inlet is opened and the inside air circulation port is closed, the defroster outlet or the floor outlet is opened, and the vent outlet is closed, with priority given to the mode selection means and the selection means. A control device for an air conditioning unit for an automobile, comprising: forced ventilation control means for controlling the blower to rotate at high speed.