JPS5946803B2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and particularly to an air conditioner suitable for application to an automobile.

In the conventional air conditioner for automobiles disclosed in Japanese Patent Application Laid-Open No. 51-31431, mode switching is performed by a purely mechanical control device using mechanical means such as wires or negative pressure, or by wires or wires.
In addition to negative pressure, we relied on an electro-mechanical control device that uses an air valve, which is a negative pressure opening/closing solenoid valve, but pure mechanical control devices require a large amount of operating force and have more elements to deal with. As a result, the control device becomes more complex and larger.

On the other hand, even in the case of electro-mechanical control devices, it is most rational to integrate the operation panel and the control mechanism, so it is necessary to install the control device in a relatively large space on the dash panel of the driver's seat. The disadvantage of occupying space is inevitable.

Furthermore, in order to use negative pressure for mode switching, a negative pressure distributor is required to switch and distribute negative pressure to each actuator according to a predetermined program, but well-known negative pressure distributors are made of metal, etc. Since the negative pressure distribution passage is formed by processing, it is difficult to change the selection of various modes, and there is a problem that there is little freedom in design.

In response to this, in recent years there has been a demand to reduce the operating force of air conditioning control devices, to reduce the space occupied by control devices and operation panels in the dash panel, and to be able to easily set arbitrary modes. This is increasing, and devices that apply electric power to part of their control devices are also being put into practical use.

However, because the system adopts a configuration in which the electrical signals for controlling each door in the air flow path of the air conditioner using negative pressure are directly taken out by an electrical switch installed corresponding to each door, many This requires the power to open and close an electric switch using a lever with a complicated shape, or an electric switch with a complicated number of contacts, so there is a natural limit to the miniaturization of the device.

C1 Accordingly, the object of the present invention is to eliminate the drawbacks of the above-mentioned prior art,
The present invention provides an air conditioner that has excellent operability, is small and lightweight, and further allows the installation of a control device part to be set arbitrarily.

The present invention provides a selection switch for mutually exclusive selection of one air conditioning mode from two or more air conditioning modes, a selection switch for decoding the output of the selection switch to determine the selected air conditioning mode, and a selection switch for mutually exclusive selection of one air conditioning mode from two or more air conditioning modes; The above object is achieved by providing a state determining means for determining switching open/close states of the plurality of doors in accordance with the above, and controlling each door in accordance with an output signal of the state determining means.

In addition, by providing means for storing the selected air conditioning mode for a predetermined period of time, and making it possible to use the stored air conditioning mode for setting the next mode or operating the air conditioner as necessary, operability in mode setting is improved. and other operability of air conditioning equipment.

Hereinafter, the air conditioner of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows a schematic diagram illustrating the operating principle of the automotive air conditioner according to the present invention. In the figure, 1 is a heater core, and 2 is a water heater core for intermittent hot water flowing into the heater core 1. The cock, 3, is the FICD (Fast) dlc"Contrnl"Device that automatically increases the idling speed to operate the cooler compressor even when the car is stopped to compensate for the lack of power.
), 4a to 4e are doors for opening and closing air passages to select wind outlets and ventilation passages, and 5a to 5e are doors provided corresponding to each of the doors 43 to 4e to open and close the doors. 5f is an actuator for opening and closing the water cock, 5g is an actuator for operating the FICD 3, and 18 is an actuator for selectively supplying negative pressure to each of the actuators 5b to 5g to operate the actuators. Negative pressure intermittent device operated by negative pressure, 1
9a.

19b is an air intake port, 190 to 19e are air discharge ports, 20 is an elevator, 22 is a fan, and 23 is the FIC
The engine carburetor controlled by D3, 25, represents a vacuum hose that connects the negative pressure interrupting device 18 and each of the actuators 5b to 5g.

Note that the negative pressure intermittent device 18 is connected to each actuator 5b to
This is a device to apply negative pressure to 5g or release it to the atmosphere as necessary. Conventionally, a negative pressure distributor, which is a mechanical negative pressure switching valve, was used, but a solenoid is used. This role is performed by an air valve, which is an electric negative pressure switching valve.

Then, the negative pressure intermittent device 18 and the actuators 5b to 5g
The actuators 5 and 5 cooperate with each other to constitute driving means for the doors 4b to 4e, etc., and each actuator 5 is controlled by this negative pressure interrupter 18.
By controlling the conduction of negative pressure to b~5g, the door 4b
-4e, etc., to select a mode.

Further, 19a is an air suction port for outside air, 19a is an air suction port for inside air, 19c is an air discharge port for the ventilator port, and 19d is an air discharge port I for the defroster.
D and 19e correspond to air discharge ports for the room, respectively.

Further, door 4a is a door for selecting whether or not to warm the inhaled air through heater core 1, door 4b is a door for selecting whether the inhaled air is outside air 1 or inside air I2, and 4c is a door for discharging the inhaled air. Door M, 4d selects whether to guide the air to the exit 19c, and door B, 4 selects whether to select 19c or 19d, 19e as the air discharge port.
e corresponds to the door D for switching between selecting 19d or 19e as the air outlet.

Various air conditioning modes are determined by the appropriate selection of the doors 4a to 4e and the states of the water cock 2W and FICD 3 [F], and the following modes are commonly used.

Strong cooling mode (MA) that cools the room using only the cooler
X C00L), mode to adjust the room temperature appropriately (A/C
), ventilation mode (VENT) that brings in outside air, cold head/feet/heat mode that blows warm air from below and cold air from above)' (Bi L
EVEL), ventilation heating (FR) that brings in outside air and turns it into warm air.
B-HEATER), internal air circulation heating (REC, HEATER) that circulates internal air as warm air, and defroster mode (DEF) that removes fog from the windshield.

The relationship between the above modes and negative pressure conduction for controlling the state of each actuator is shown in Table 1 below.

○: Negative pressure conduction ×: Open to atmosphere A/C mode The operation of the air conditioner shown in FIG. 1 will be explained. From Table 1, W of the negative pressure switching device 18,
11. Negative pressure is generated at the negative pressure output nipple of F, and the other nipples are open to the atmosphere.

Therefore, the door 4b is pulled to the intermediate position by the actuator 56, and the other doors 4c, 4d, and 4e are located on the side pushed back by the spring.

The water cock 2 is opened by the actuator 5f, and at the same time hot water from the vehicle engine flows into the heater core 1, the FICD 3 is activated by the actuator Sgl to keep the idle speed of the vehicle engine high.

The air sucked in by the door 4b from the inside and outside air suction ports 19a and 19b at a ratio of 80% inside air and 20% outside air is heated by passing through the heater core 1 by the door 4a, and by the evaporator 20. The warm air and cold air are mixed with each other to be cooled and are blown into the vehicle interior from the air conditioner outlet 19c.

Therefore, by changing the position of the door 4a,
L It is possible to change the proportion of hot air, and the temperature of air blown from the air conditioner outlet 19c can be changed.

When the Bi-LEVEL mode is set, as is clear from Table 1, the water cock 2 is opened and the doors 4b and 4b are opened.
4d and 4e are pulled by actuators 5b, sa, and 5e, and door 4c is pushed back by a spring.

Note that in this Bi-LEVBL mode, the compressor is not working, so the FICD 3 is not working.

The outside air sucked in through the outside air intake port 19a is divided into two parts by the door 4a as in the A/C mode, and the warm air heated by the heater core 1 is sent to the defroster outlet 19d.
The outside air that has passed through the evaporator 20 is blown out from the air conditioner outlet 19C with almost no temperature change.

Fig. 2 is a circuit diagram of a control section of an air conditioner according to an embodiment of the present invention for realizing various air conditioning modes as described above, and 6 in the figure shows mode selection arranged on the control panel. With switch, 6a is MAXCOOL, 6b is A/C16c
is V E N 'I', 6d is Bi-LEVEL, 6e
is FRB, -HEA,TER.

6f is a switch corresponding to RBC, -HEATER, 6g is a switch corresponding to each mode of DEF, In1 to 7 n4 is a NOR circuit,
71,~7σ3 are OR circuits, 8a~8g are W, respectively.
D, B, M, 11. I2. The air valve coils 93 to 9g corresponding to F are controlled by the outputs of the NOR circuits 7n1 to 7n4 and the OR circuits 7σ1 to Tσ3, and are air valve coils 8a to 8g that constitute the negative pressure intermittent device 18 of the drive means. 1γ is an air conditioner switch, and 21 is a control device.

Incidentally, the switches 6a to 6g are all self-holding type and include a mechanism to prevent simultaneous locking.

In the configuration as described above, when one of the mode selection switches 6a to 6g on the control pulse is selected,
It is logically determined which mode switch is pressed through the OR circuits 701 to 703 or 7n1 to 7n4 constituting the state determining means, and which door is opened or closed in order to switch to the mode selected by the mode switch. It determines the status of each door and outputs it as an electrical signal.

This electric signal is given to transistors 9a to 9b forming an output circuit for driving air valve coils 8a to 8g, and opens and closes each air valve according to the logical judgment,
Thus, each door is switched open and closed.

Note that the mode selection switch 6 maintains the on state by pressing one switch knob, and the switch that had been kept in the on state by pushing the other switch knob. As previously mentioned, the use of mutually exclusive interlocking switch types that turn off and return is used.

Here, in the OR circuits 7゜1 to 703, when a 1'' signal, represented by a certain positive voltage, is input to at least one input terminal, the output signal becomes ``1'', and all input terminals have zero voltage. It is well known that the output signal becomes '0' only when the representative '0' signal is input; on the other hand, the NOR circuit 7
Contrary to the OR circuits 7゜1 to 703, n 1 to 7n4 have an output signal of "0" when an input signal of '1' is input to at least one input terminal, and when all human input signals are '0'. It is also well known that the output signal becomes 1''.

Note that the OR circuits 76, to 763 and the NOR circuit 7n1
7n4, the air valve driving transistors 9a to 9g are turned on, and the air valves conduct negative pressure to the corresponding actuators by the air valve coils 8a to 8g.

Now, when the switch 6b for selecting the A/C mode is pressed, a "1" signal is input to the NOR circuit 7n2゜7n4 and the OR circuit 7σ3 of the state determining means, and the other NOR circuits and OR circuits are 0” signal is input.

Therefore, since the input signal of the NOR circuit 7n1 is "0",
An output signal of "1" is generated, the air valve driving transistor 9a forming the output circuit is turned on, and negative pressure is supplied to the actuator 5f forming the driving means.

The human input signal of the OR circuit 701 that constitutes the state determining means is also
This output is "0".

Therefore, the air valve driving transistor 9b constituting the output circuit is turned off, and the actuator 5e is opened to the atmosphere.

Similarly, the air valve coil 8 constituting the driving means
e t 8 g is driven, the corresponding air valve conducts negative pressure, and the air valve coils 8C98d and 8f are opened to the atmosphere, satisfying the A/C mode specifications shown in Table 1.

In the same way when setting other modes, each door 4
b to 4e are controlled to perform control according to the desired mode.

By relying on configuration E as described above, it is possible to obtain an air conditioner with extremely excellent operability, such as requiring little operating force and being able to obtain any mode with a single touch.

In addition, since only the mode setting switches 68 to 6g need to be installed on the operation panel, it occupies less space on the dash panel in terms of area and space, and by integrating the circuits, it is compact and It is also possible to obtain an inexpensive control circuit.

FIG. 3 is a circuit configuration diagram of a control section of an air conditioner according to another embodiment of the present invention in which a portion corresponding to the mode selection switch 6 shown in FIG. 2 is replaced with a circuit equipped with a drowsiness memory device. In the figure, fih, (ii is a mode switching switch, 1
0 indicates a memory circuit.

In the configuration as described above, each time the mode changeover switch 61 is pressed, the data from the memory circuit 10 is changed.

Switches 5a, 6b, 5c shown in FIG. 2...
The same signals as when pressing ・are output in sequence, and the last output position is memorized and retained.

Each time the other mode changeover switch 6h is pressed, the memory circuit 10 sends the switch 6gy shown in FIG.
Exactly the same signals as when pressing 6f, . . . are sequentially output, and the last output position is memorized and retained.

That is, by pressing the mode changeover switch 6h or 61 an appropriate number of times, it is possible to give a "1" signal to the control device section 21 from any position, and the rest is the same as in the case of the configuration shown in FIG. Setting mode selection control is performed in exactly the same manner.

Although the memory circuit 10 shown in FIG. 3 is capable of outputting seven mode positions, for the sake of simplicity, the block diagram of FIG. 4 illustrates a memory circuit that outputs three mode positions.

In the figure, 11a to 11c are D-type flip-flops, 12
a to 12f are AND circuits, 13a to 13d are OR circuits,
14 is a clock pulse generation circuit, and 15a to 15c are output terminals, respectively.

Incidentally, the D-type flip-flops 11a to 11c have at least two input terminals, CL and output terminal 0, and at the moment a clock pulse is input to the input terminal CL, the "θ" applied to the input terminal ” or “1” signal until the next clock pulse is input, and the stored content “0” or “1” is output to the output terminal O.
It has a function to output to.

On The clock pulse generator 14 uses a monostable multivibrator circuit, and the mode selection switch 6h
, 6i is a circuit that generates one clock pulse every time 6i is pressed.

Now, the output "1"' is output to the output terminal 15a, and the terminal 1
It is assumed that 5b and 15c have "0'' outputs.

When the mode changeover switch 61 is pressed here, the signal It 1 jj is input to the AND circuits 12b, 12d, and 12i, and at the same time, a reflock pulse is generated from the clock pulse generation circuit 14, and the respective flip-flops 11a, 1
Clock pulses are given to l b and 11 c.

At this time, only the AND circuit 12d receiving the "1" output from the output terminal 15a becomes conductive and outputs a "P1" signal, which is applied to the D2 terminal of the flip-flop 11b through the OR circuit 13b.

At this time, other AND circuits 12a to 12c, 12e to 12
At least one of the two outputs of f is "1", so all of these output signals are "0".

That is, the 1'' signal, which is the mode selection signal that was previously at the output terminal 15af, is applied to the input terminal D2 of the D-type flip-flop 11b, and this signal is stored in the flip-flop according to the clock pulse and output from the output terminal. It is output to terminal 02 as a °'1" signal.

At this time, the other two flip-flops 11a and 11C both have their input terminals D1. Since the human input signal to D2 is 0'', a 0'' signal is output to each output terminal 00, 03.

Therefore, by pressing the mode changeover switch 61 once, the output signal ``1'' is sent to the output terminal 15a. .

Next, when the mode changeover switch 6h is pressed, only the AND circuit 12a changes its output to 1", and the output signal at 1 ty to the output terminal 15b moves to the left by one position and outputs it. A tt 1 pp ratio output is made from the terminal 15a.

Furthermore, if a circuit block for the 3-mode position shown in Fig. 4 is added, the configuration can be easily achieved even if there are many setting modes, and the 7-mode position shown in Fig. 3 can be easily configured. It can also be easily adapted.

According to the configuration described above, there are only two switches for mode selection, which makes the operation extremely simple.The space occupied on the dash panel is also minimal, and the temperature setting knob, air volume setting knob, etc. are simplified. Due to the combination of automation and automation, the space for controlling the air conditioner on the dash panel is extremely small and can function satisfactorily.

Incidentally, the embodiments shown in FIGS. 2 and 3] An air conditioner for an automobile equipped with an electrical logic circuit for mode control and an electrical storage device for storing the mode signal is as follows:
For the reasons described below, remote control of modes from two or more operation panels has very advantageous conditions and is rational.

In other words, when performing remote control from two or more operation panels, since the control signals from each operation panel are simple electrical signals, it is easy to prioritize the control signals. In the configuration shown in FIG. 3, modes can be selected in exactly the same way from any operation panel simply by adding mode changeover switches equal to the number of operation panels.

FIG. 5 shows a circuit configuration diagram of a control section of an air conditioner according to another embodiment of the present invention, in which a magnetic memory element 16 is used as an electrical memory device, and the magnetization direction of the S-N pole is tt
1 u, tt □ pp signals (by making these correspond, the control signals are stored and retained).

According to this embodiment, the stored contents are not lost even when the power to the control circuit is turned off, so that it is convenient and easy to use.

FIG. 6 is a modified example for achieving the same purpose as shown in FIG. , the memory contents of the memory circuit 10 are always preserved.

By using a C-MO8 type integrated circuit or the like as the memory circuit 10, the power consumption can be reduced to a negligible level, so the memory content can be retained without putting a burden on the car battery, and the magnetic The same effect as the structure shown in FIG. 5 using a memory element can be obtained.

FIG. 7 is a schematic diagram showing another example of the automotive air conditioner according to the present invention, which differs from the structure shown in FIG. 1 in that the structure of the device itself is simple and the number of mode settings is small.

In an air conditioner having such a configuration, in order to perform the mode control shown in Table 2 below, ○: Negative pressure conduction ×: Open to atmosphere Instead of the control device shown in FIG. 2, the control device shown in FIG. A control device having a configuration may be used.

Incidentally, in the configuration shown in FIG. 8E, the DEF mode selection switch 6g does not need to be electrically connected.

As described above, an air conditioner having any control mode can be replaced with an electrical logic circuit.

Furthermore, in each of the above embodiments, a gate circuit such as an OR circuit or a NOR circuit is used as a logic circuit, but a simple RO
It is obvious that M, a diode matrix, etc. can be applied.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the operating principle of an air conditioner for an automobile according to the present invention, FIG. 2 is a circuit diagram of a control section of an air conditioner according to an embodiment of the present invention, and FIG. FIG. 4 is a block diagram illustrating a simplified configuration of the storage circuit shown in FIG. 3; FIG. 5 is a circuit configuration diagram of a control unit of an air conditioner according to another embodiment of the invention; FIG. 6 is a circuit diagram of a control unit of the air conditioner according to the embodiment, FIG. 6 is a circuit diagram showing a modified example for achieving the same purpose as shown in FIG. 5, and FIG. 7 is a diagram of the automotive air conditioner according to the present invention. Schematic diagram showing another example of
This figure is a circuit configuration diagram of a control section applied to the configuration shown in FIG. 7. 1 explanation of the code, 1... heater core, 2...
...Watercock, 3...FICD, 4a~
4e...Door, 5a-5g...Actuator, 18...Negative pressure intermittent device, 20...
...Evaporator, 22...Fan, 6...
...Mode selection switch, 8...Air valve coil, 10...Memory circuit, 11a-1
1c...D type flip-flop, 14...
...Clock pulse generation circuit, 15a to 15c...
...Output terminal.

Claims (1)

[Scope of Claims] 1. A driving means for driving a plurality of doors that switch and open/close air flow paths, a mutually exclusive r4'' selection switch for selecting an air conditioning mode from two or more air conditioning modes, and said selection. a state determining means for decoding the output of the switch to determine the selected mode, and determining switching open/close states of the plurality of doors according to the air conditioning mode; An air conditioner for an automobile, characterized in that it is equipped with an output circuit that provides a drive control signal to the means. 2. A drive means that drives a plurality of doors that switch and open/close air flow paths, and two or more mutually exclusive air conditioning modes. a selection switch that selects one air conditioning mode from among; a state determination that determines the selected air conditioning mode by decoding the output of the selection switch; and determines the open/close state of the plurality of doors in accordance with the air conditioning mode; means for outputting a drive control signal to the drive means in response to an output signal of the state determining means; and a storage means for storing an electrical signal indicating the selected air conditioning mode for a necessary period of time. Automotive air conditioner.