JPS6349642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioner that is provided with a maximum cooling/heating switch and an air volume control switch in addition to a temperature setting lever.

Many modern vehicles are equipped with an air conditioner (hereinafter referred to as an "air conditioner") that cools or heats air to control the temperature inside the vehicle to a set temperature. In such an air conditioner, in midsummer or midwinter, the air conditioner can be operated in maximum cooling mode or maximum heating mode in order to bring the temperature inside the vehicle close to a set temperature in a short time. Figure 1 shows the schematic configuration of a conventional air conditioner, in which a blower fan 1 connects an air intake port 2.
The air sucked into the air conditioner from the evaporator 3
A part of the cold air is passed through the heater core 4 and heated, mixed with the cold air from the evaporator 3, and discharged into the passenger compartment from the air outlet 5. The blowout temperature is adjusted by operating the valve 8 with the negative pressure actuator 6 to change the mixing ratio of hot air and cold air and the flow rate of hot water to the heater core 4. On the other hand, by changing the rotational speed of the blower fan motor 9, the amount of air blown is adjusted and the indoor temperature is controlled (see Japanese Patent Application Laid-open No. 47914/1983).

The temperature setting section of such conventional air conditioners is
As shown in the figure, there is a slit 10 in the front panel 10.
a is formed, and the temperature setting lever 11 can be moved horizontally within this slit 10a. Slit this temperature setting lever 11 into the slit 10.
When the temperature is set using the temperature scale provided along the line a, the vehicle interior temperature is adjusted to the set temperature by a bridge circuit, which will be described later. In addition, the temperature setting lever 11 is set to the maximum cooling (full cool) position C or the maximum heating (full hot) position provided at both ends of the slit 10a.
When set to position H, the air conditioner is configured to operate in full cool mode or full hot mode. In this way, if the temperature setting lever is shared for the normal temperature setting and the full cool and full hot settings, the structure of the temperature setting section and the structure of the temperature control circuit can be simplified.

By the way, in such air conditioners, the same temperature setting lever is used to set the room temperature, maximum cooling, and maximum heating, so to operate the air conditioner in maximum cooling/heating mode, move the temperature setting lever to the previous room temperature. Since the temperature setting lever must be manually moved from the set position to the maximum cooling/heating position, there is the inconvenience of having to return the temperature setting lever to the room temperature setting position after canceling the maximum cooling/heating operation. Furthermore, during maximum cooling/heating, it is preferable to operate the blower at the maximum rotational speed in order to enhance the cooling/heating effect, but in the conventional air conditioner mentioned above, it is necessary to switch the fan switch from automatic operation to manual operation and set the fan speed to the maximum rotational speed. There is,
There is the same hassle as with the temperature setting lever.

The present invention has been made in view of the above points, and aims to eliminate the troublesome operation of returning the temperature setting lever when the maximum cooling/heating operation is canceled, and to obtain a rapid cooling/heating effect, and achieves this purpose. In order to do this, a maximum cooling/heating operation means and an air volume control means are provided, and when the air conditioning operation switch is on, when the maximum cooling and heating operation means is operated, the system operates in the maximum cooling mode, and when the air conditioning operation switch is off. When the maximum cooling/heating operating means is operated, the system operates in the maximum heating mode, and in either case, the air volume control means operates in the maximum air volume mode.

Next, the air conditioner of the present invention will be explained with reference to FIGS. 3 to 5.

FIG. 3 is a front view of the temperature setting operation panel of the air conditioner according to the present invention, in which the temperature setting lever 11 moves along the slit 10a formed in the front panel 10.
In addition to this, a maximum cooling/heating operation button 12 and a fan speed changeover switch 35 are provided, and the fan speed changeover switch 35 may be a push-pull type switch or a push-lock type switch.

In FIG. 4, a temperature control section is composed of an absolute value conversion circuit 40, voltage dividing resistors 41, 42, 43, 44, comparators 45, 46, AND circuits 47, 48, a NOT circuit 49, and transistors 51, 52. ,
This control section operates as follows. The potential change at point a corresponding to the deviation between the temperature set by the temperature setting sliding resistor 15 and the room temperature detected by the thermistor 14 is converted into an absolute value by the absolute value conversion circuit 40,
A comparator 45 compares the deviation signal with the potential at point d divided by resistors 41 and 42, and determines whether the deviation signal is greater than or equal to a predetermined value determined by the potential at point d. On the other hand, a comparator 46 compares the potential at point a and the potential at point e divided by resistors 43 and 44,
It is determined whether the deviation signal is positive or negative, that is, whether the room temperature is lower or higher than the set temperature. When the deviation signal is smaller than the predetermined value, the output of the comparison circuit 45 is "0", so the outputs of the AND circuits 47 and 48 are also "0", and the transistors 51 and 52 are both non-conductive. In this state, the sliding resistances 16, 17,
A control section consisting of fixed resistors 18 and 19, comparators 20 and 21, and transistors 22 and 32 performs normal control operations, and the negative pressure actuator 6 is activated by the control signal to set the air mix door 7 to the H value or L side. to maintain the room temperature at the set temperature.

When the deviation signal from the absolute value conversion circuit 40 is greater than or equal to a predetermined value, the comparator 45 produces an output of "1". At this time, if the room temperature is lower than the set temperature, the comparator circuit 46 outputs "1".
The output of the AND circuit 47 becomes "1", and this signal makes the transistor 52 conductive, and the sliding resistors 16, 1
7 is short-circuited to lower the potential at point c, bringing point c to zero potential. Therefore, the comparator 20 continues to output an output of "1" until the deviation signal from the absolute value conversion circuit 40 falls below the voltage at point d and the output of the comparator 45 becomes "0". Therefore, the coil 24 is energized and the three-way valve 26 is switched to lower the piston 28 and move the air mix door 7 to the maximum heating position P ₁ (see FIG. 1) and fix it there. This causes the blowing temperature to rise to the maximum temperature, causing the room temperature to rise rapidly.

Conversely, when the room temperature is higher than the set temperature and the deviation signal from the absolute value conversion circuit 40 is equal to or higher than the predetermined value, the output of the comparator 46 is "0", so the output is sent to the AND circuit 48 via the NOT circuit 49. An input of "1" is input, and this and an input of "1" from the comparator 45 produce an output of "1" in the AND circuit 48. This signal makes the transistor 51 conductive and short-circuits the resistor 18, so that the potential at point b becomes the power supply voltage +V, and the potential at point c rises. Therefore, the comparator 21 continues to output "1" until the deviation signal falls below a predetermined value. Therefore, the coil 25 is energized, the three-way valve 27 is switched, the piston 28 is raised, and the air mix door 7 is moved to the maximum cooling position P ₃ (first
(see figure) and fix it in this position.
As a result, the blowing temperature is lowered to the lowest temperature, and the room temperature is rapidly lowered.

Next, the air volume control section controls the temperature setting sliding resistor 15.
The potential change at a point corresponding to the deviation between the set temperature and the room temperature detected by the thermistor 14 is converted into an absolute value by an absolute value conversion circuit 53. Comparator 5
7 produces an output of "1" when the deviation signal from the absolute value conversion circuit 53 exceeds the potential of the voltage division point f formed by the resistors 54, 55, and 56, and the comparator 58 outputs "1" when the deviation signal from the absolute value conversion circuit 53 exceeds the potential of the voltage division point f formed by the resistors 54, 55, and 56. When the potential exceeds , an output of "1" is generated. The comparator 63 produces an output of "1" when the deviation signal exceeds the potential of the voltage dividing point h formed by the resistors 64 and 65. Here, the partial pressure points f, g,
Let the potentials of h be α ₁ , α ₂ , α ₃ respectively, then α ₁ <α ₂
The relationship is <α ₃ .

The output of comparators 57, 58, 63 causes resistance 5
The potential at the voltage dividing point i of 9, 60, 61, and 62 changes as follows. That is, the potential at the voltage dividing point i is lowest when the outputs of the comparators 57, 58, and 63 are all "0", and gradually increases as the outputs of the comparators 57, 58, and 63 sequentially become "1". become higher.
As the potential at the voltage dividing point i changes, the current flowing from the voltage dividing point i into the base of the control transistor 66 connected to the circuit of the blower fan motor 9 changes, and the voltage applied to the motor 9 changes. . As a result, the amount of air blown changes in stages according to the rotational speed of the motor 9.

Figure 5 is a diagram showing the relationship between deviation and air volume.The air volume is L when the deviation reaches α ₁ from 0, M ₁ when the deviation reaches α ₁ to α ₂ , and M when the deviation reaches α ₂ from α ₃ . is _M2
and changes in stages. L, M ₁ , and M ₂ are normal control regions, and when the deviation is equal to or greater than a predetermined value α ₃ , the air volume becomes the maximum value H, and this state continues until the deviation becomes smaller than α ₃ . In addition, when the output of the comparator 63 becomes "1" in FIG. 5, the transistor 67 is made conductive by that output, and the coils 68 and 69 are excited. The coils 68 and 69 move the outlet door in FIG. 1 to the dotted line position to fully open the outlet 5, which corresponds to maximum heating or maximum cooling.

Now, in the above control circuit, a relay 100 is provided, one end of which coil 100a is grounded, and the other end is connected to the air conditioning switch 101 and the compressor 1.
02 solenoid 102a.
The common contact d of the relay 100 is connected to the power supply voltage +V via the maximum cooling/heating operation button 12, one switching contact e is connected to the bases of the transistors 22 and 23, and the other switching contact f is connected to the transistor 32.
and is connected to the base of 23. On the other hand, another one
A relay 200 is provided, the coil 200
One end of a is grounded, and the other end is connected to a common contact d of the relay 100. Contact 20 of relay 200
0b is connected between the collector and emitter of the transistor 66 of the air volume control section. relay 100
A pilot lamp 13 is connected between the common contact d and ground.

Next, the operation will be explained.

When the air conditioning switch 101 is turned on, the compressor 102 is driven and the coil 100a of the relay 100 is excited, so that the common contact d is connected to the switching contact f. When the maximum cooling/heating operation button 12 is pressed, the pilot lamp 13 lights up and +V voltage is applied to the bases of the transistors 32 and 23, making them conductive. As a result, the transistor 22 becomes non-conductive, but the coil 25
is excited, and the operation of the three-way valve 27 causes the piston 28 to move to the maximum cooling position. On the other hand, since the coil 200a of the relay 200 is also excited, contact 2
00b is closed, and as a result, +V voltage is directly applied to the blower fan motor 9, so the motor 9 rotates at the maximum rotational speed and the air volume becomes maximum.

Next, when the air conditioning switch 101 is turned off, the coil 100a of the relay 100 is not excited, so the common contact d is connected to the switching contact e, and when the maximum cooling/heating operation button 12 is turned on in this state, the pilot lamp 13 lights up and +V voltage is applied to the bases of transistors 22 and 33, making them conductive, coil 24 is excited, and transistor 23 becomes non-conductive. As a result, the three-way valve 26 is activated and the piston 28 is moved to the maximum heating position. On the other hand, since the coil 200a of the relay 200 is also excited, the motor 9 rotates at the maximum rotational speed and the air volume becomes maximum, as in the case of the maximum cooling mode described above.

In this way, the air conditioner can be set to maximum heating mode if the air conditioning switch is off by pressing the maximum cooling/heating operation button 12 without operating the temperature setting lever at all.
When the air conditioning switch is on, it operates in the maximum cooling mode and maximum airflow mode, and when the operation button 12 is released, the temperature control lever remains at the optimal position that has already been set, so the temperature There is no need to worry about setting the setting lever to the optimum position again.

As explained above, in the present invention, in addition to the temperature setting lever, a maximum cooling/heating operation button and an air volume control means are provided, and simply by operating this operation button, the air conditioner is automatically set to the maximum cooling/heating mode and the maximum air volume mode. When you release the operation button, you can automatically return to temperature control using the temperature setting lever, so especially when you release the maximum cooling/heating mode, you can set the temperature setting lever to the original optimum temperature position. There's no hassle of fixing it. It also provides rapid cooling and heating effects. The same is true for the fan speed switch button. The invention thus significantly simplifies maximum heating and cooling operations.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional air conditioner, FIG. 2 is an external view of the temperature setting section of the conventional air conditioner, and FIG. 3 is an external view of an embodiment of the operation section of the air conditioner according to the present invention. FIG. 4 is an embodiment of a temperature control circuit for an air conditioner according to the present invention, and FIG. 5 is an explanatory diagram of an air volume control operation. 1... Blower fan, 2... Air intake port, 3... Evaporator, 4... Heater core, 5... Air outlet, 6...
Negative pressure actuator, 7... Air mix door, 8
…Hot water valve, 9…Blow fan motor, 11…Temperature setting lever, 12…Maximum cooling/heating operation button, 13
...Pilot lamp, 14...Thermistor for temperature detection, 15, 16...Sliding resistance for temperature setting, 20, 2
1... Comparator, 26, 27... Three-way valve, 28... Piston, 35... Fan speed selection switch, 100, 2
00...Relay, 100a, 200a...Coil.

Claims (1)

[Claims] 1. A temperature setting section, a room temperature detection section, a control section that controls the temperature of air blown into the room based on the temperature difference between the temperature set by the temperature setting section and the room temperature detected by the room temperature detection section, and the temperature setting section. A maximum cooling/heating operation means is provided separately from the control section and outputs a maximum cooling/heating mode command to the control section when operated, and an air conditioning operation switch turns on the maximum cooling/heating mode command output by the operation of the maximum cooling/heating operation means. The first switch switches to the maximum cooling/heating mode command when OFF, and switches to the maximum heating mode command when OFF.
a second relay means for switching the air volume control means to a maximum air volume mode when the maximum cooling/heating operation means is operated; A vehicle air conditioner featuring: