JPS6310322Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Industrial application field) The present invention can maintain the temperature of the air coming out of the outlet constant regardless of changes in outside air temperature, and can The present invention relates to an air conditioner for automobiles that allows the air outlet temperature to be freely adjusted regardless of changes in temperature.

(Prior art) A conventional automobile air conditioner that adjusts the temperature inside the vehicle to a predetermined temperature even if the temperature of the outside air or the temperature inside the vehicle changes is shown in Figure 1. There is something to show. This type of device is also called an automatic air conditioner, and as shown in the figure, there is a variable resistance for setting the temperature inside the vehicle (hereinafter referred to as PTC).
21, an inside air sensor 22 and an outside air sensor 23 are connected in series, a fixed resistor 24 and a mix door position detection variable resistor (hereinafter referred to as PBR) 25 are connected in series, and these series circuits are connected in parallel with the battery 10. ing. In addition, the connection point between PTC21 and internal air sensor 22 is set as point A, and resistor 24 and PBR2
Let B be the connection point with 5. The points A and B are connected to a differential amplifier 40. The differential amplifier 40 is connected to a transducer 50, which converts the signal output of the differential amplifier 40 into negative pressure. Further, the power servo 60 opens and closes the mix door 70 in response to the negative pressure generated by the transducer 50. Note that the movable contact of the PBR 25 is adapted to move in accordance with the amount of movement of the axis provided in the power servo 60.

The operation of the above conventional device will now be described. Assume that the voltage at point A of the automobile air conditioner shown in FIG. 1 increases from a certain stable state. The reason why the voltage at point A becomes high is that the occupant increases the set temperature by adjusting the value of PTC 21 to a small value, or the temperature inside or outside the vehicle becomes low. Thus, when the voltage at point A becomes higher than the previous state, it becomes higher than the voltage at point B, causing differential amplifier 40 to generate a positive output signal and transducer 50 to open the atmospheric valve. This causes the power servo 60 to control the mix door 70.
It is gradually driven toward the HOT side, that is, in the direction of increasing the amount of hot air. In the process in which the power servo 60 gradually drives the mix door 70 in this way, the axis provided in the power servo 60 moves, and in conjunction with this, the value of PBR25 gradually increases. As a result, the voltages at points A and B match, and the differential amplifier 4
0 will no longer be output. This closes the atmospheric side valve of the transducer 50. Therefore, power servo 60 and mix door 70 are stopped. As a result, the temperature of the air coming out of the outlet becomes higher than before. In this way, this air conditioner operates the mixer door 70 so that the values at point A and point B match as the temperature inside the vehicle changes. As a result, the temperature is adjusted to correspond to the value of PTC21.

Contrary to the above case, when the voltage at point A becomes low, the differential amplifier 40 generates a negative output, and the transducer 50 opens the negative pressure side valve. As a result, the power servo 60 is connected to the mix door 70.
gradually towards the COOL side, that is, in the direction of reducing the amount of hot air. During this process, the resistance value of the variable resistor 25 interlocked with the axis of the power servo 60 gradually decreases. As a result, the values of the voltage at point A and the voltage at point B match, the differential amplifier 40 stops outputting, and the power servo 60 and mix door 70 stop. As a result, the temperature of the air coming out of the air outlet becomes lower than before, and as a result, the temperature inside the vehicle is adjusted in the same way as described above.

As mentioned above, in the conventional example, the opening degree of the mixer door 70 changes depending on the values of the PTC 21, the inside air sensor 22, and the outside air sensor 23, and the temperature of the warm air coming out of the outlet changes. As a result, the temperature of the air blown into the cabin changes,
The vehicle interior temperature set by PTC 21 will be maintained constant even if the outside air temperature changes.

(Problem that the invention attempts to solve) However, in the above conventional example, when starting a vehicle under the scorching sun, the PTC 21 is set to the maximum cooling state (MAX).
COOL), the outside air temperature detected by the outside air sensor 23 and the inside air temperature detected by the outside air sensor 22 are both high, so the cold air that has passed through the cooler unit is mainly supplied to the passenger compartment. It turns out. However, if you leave the air conditioner operating for a certain period of time, the temperature inside the vehicle will drop, and the interior will reach the maximum cooling state you set.
The resistance value of the inside air sensor 22 changes. As this resistance value changes, the mixture door 70 rotates so that air with a higher temperature than the initial temperature is blown into the vehicle interior.

The opening/closing operation of the mixer door 70 is set based on the normal sensible temperature of the occupant. Therefore, in the conventional automatic air conditioner, the opening degree of the mixer door 70 is set according to the temperature of the outside air and the inside of the vehicle, which are set in advance by the inside air sensor 22 and the outside air sensor 23. For this reason, in the above-mentioned conventional auto air conditioner type automobile air conditioner, the opening degree of the mix door 70 is determined by the resistance value determined by the PTC 21 and both sensors 22 and 23. The passenger cannot set the opening degree to a desired opening degree. For example, as in the above case, even if the inside of the vehicle is set to the maximum cooling state under the scorching sun, once the inside of the vehicle reaches a certain temperature, the inside of the vehicle will no longer be cooled, regardless of the capacity of the evaporator in the cooler unit. cannot be cooled down.

Therefore, in conventional automatic air conditioners, for example,
If someone who has been exposed to the hot sun for a long time gets on board,
Naturally, the PTC 21 will be set to the maximum cooling state and the air conditioner will be activated, but after a certain period of time, the temperature inside the vehicle will drop to the maximum coolness for normal occupants, and no more The internal air sensor 22 controls the temperature so that it does not drop, so even if the passenger wishes to lower the temperature further to get rid of hot flashes more quickly, the problem is that the temperature never drops below a certain level. have.

Therefore, the present invention is capable of automatically adjusting the temperature of the air coming out of the air outlet to a predetermined temperature regardless of changes in the temperature of the outside air, and also allows the passenger to directly control the opening of the mixer door as necessary. The purpose is to be able to freely adjust the temperature.

"Structure of the invention" (Means for solving the problem) The present invention to achieve the above-mentioned purpose outputs an output according to the temperature difference between the temperature detected by the inside air sensor and the outside air sensor and the set temperature in the vehicle interior. In an automotive air conditioner having a differential amplifier circuit and a mixture door drive mechanism that drives the mixture door to an opening degree according to the output of the differential amplifier circuit, the air conditioner is connected in parallel to the inside air and outside air sensors that are connected in series with each other. The air conditioner for an automobile is characterized by having a fixed resistor provided in the air conditioner, and a changeover switch that switches between the inside air and outside air sensors and the fixed resistor.

(Function) When the changeover switch is connected to the inside/outside air sensor side,
It becomes a so-called automatic air conditioner, and even if the outside temperature changes, the temperature inside the vehicle will be maintained at the set temperature by opening and closing the mixer door. On the other hand, when the changeover switch is connected to a fixed resistor, the system becomes a manual air conditioner, and temperature control is achieved with the mixer door fixed at the desired position. In this way, the automatic air conditioner condition and the manual air conditioner condition can be obtained by operating the changeover switch.

(Example) The present invention will be described in detail below based on an example shown in the accompanying drawings. FIG. 2 is a circuit diagram showing an embodiment of the present invention. Note that the same members are given the same reference numerals. In this embodiment, an inside air sensor 22 and an outside air sensor 23 are connected in series, and a fixed resistor 30 is provided in parallel with them. Then, the internal air sensor 22, the external air sensor 23, and the fixed resistor 30, which are connected in series with each other, are alternately switched.
A changeover switch 31 connected to the PTC 21 is provided. The other parts are almost the same as the conventional example shown in FIG. However, there is a display on PTC21, and MAX HOT is displayed at the knob position where the value of PTC21 is the minimum, and when this knob is set to MAX HOT, the mix door 70
is set to be fully open (MAX HOT), that is, the maximum heating position. Furthermore, MAX COOL is displayed on the opposite side of the part where MAX HOT is displayed, and when set to this position, it will be in the maximum cooling state. Specifically, PTC21 and PBR25 have a one-to-one relationship, that is, PTC21 and PBR
If the maximum resistance value of PBR 21 is the same as that of PBR 25, and the maximum resistance value of PBR 21 is, for example, 1 KΩ, the PBR 25 may also be set to a maximum of 1 KΩ.

Next, the operation of the above embodiment will be explained. First, the changeover switch 21 is switched to the fixed resistor 30 side.
If the voltage at point A is higher than the voltage at point B, the power servo 60 gradually drives the mixer door 70 in the direction of MAX HOT via the differential amplifier 40 and transducer 50.
The mix door 70 stops at the point where the voltages at point A and point B match. That is, in this case, hot air having a higher temperature than before the switch 31 is turned will come out from the outlet.

When the changeover switch 31 is switched to the fixed resistor 30 side, if the voltage at point A is lower than the voltage at point B, contrary to the above case, the operation is opposite to that in the above case. That is, the mix door 70 is driven in the fully closed direction and stops at a position where the voltage at point A and the voltage at point B become equal. That is, in this case, the temperature of the hot air coming out of the air outlet is lower than that in the previous state. Thereafter, even if the temperature inside and outside the vehicle changes, the temperature of the air coming out of the air outlet will always be the same as the temperature of the mixer door 70 at a constant opening.
This is because in the above case, since the sensors 22 and 23 do not work, the force that changes the opening degree of the mixer door 70 does not work. Therefore, if you feel that the air temperature at that time is too high or too low after switching the changeover switch 31 to the fixed resistance 30, you can adjust the PTC 21 appropriately to adjust the adjusted air temperature. becomes constant. By using the present invention in this manner, the temperature of the hot air coming out of the outlet can be freely adjusted according to preference, and the temperature of the hot air remains constant.

Although the above embodiments have mainly been described with respect to an air conditioner for an automobile that has a heater and a compressor, it is of course possible to apply an air conditioner for an automobile that does not have a compressor.

Alternatively, the changeover switch 31 may be linked to an air conditioner switch for turning on and off the operation of the cooling circuit, so that when the air conditioner switch is turned off, the changeover switch 31 is switched to the fixed resistor 30 side. In this case, when the air conditioner switch is turned off, the blower fan rotates, and the entire circuit shown in Figure 2 operates, and by adjusting the value of PTC21, the temperature can be set to the desired temperature. The wind is starting to come out.
By setting the ratio of PTC21 and PBR25 to 1:1, the movement of the resistance for setting the cabin temperature and the mixer door can be made to operate at 1:1. Of course, when the air conditioner is turned on, the compressor operates and cool air comes out of the outlet depending on the temperature inside the vehicle. By interlocking the air conditioner switch and the changeover switch 31 in this way, the air conditioner switch and the changeover switch 3
1, the inconvenience of having to switch between each one is eliminated.

Furthermore, the defrost switch and changeover switch 3
1, so that when the defrost switch is turned on, the changeover switch 31 can be switched to the fixed resistor 30 side. By doing so, in the case of the defrost mode, the temperature of the warm air coming out of the defrost duct can be freely adjusted. In other words, in the past, when the defrost mode was set, MAX HOT warm air came out from the defrost duct, but in this case, the warm air would accumulate in the upper part of the passenger compartment, causing the occupants' heads to become too hot. By doing so, the harmful effects can be prevented. This is because the room temperature cannot often be controlled with the A/C SW OFF or in defrost mode.

``Effects of the invention'' As mentioned above, the invention consists of a differential amplifier circuit that outputs an output according to the temperature difference between the temperature detected by the inside air sensor and the outside air sensor and the set temperature inside the vehicle; In the air conditioner for an automobile, the air conditioner has a mixer door driving mechanism that drives the mixer door to a different opening degree; Since it has a changeover switch that switches between a fixed resistance and a fixed resistance, it is possible to set the vehicle to a so-called automatic air conditioner state and set the temperature inside the vehicle to a desired temperature by controlling the opening and closing of the mixer door regardless of changes in the temperature of the outside air. In addition, it is also possible to set the air conditioner to a so-called manual type air conditioner by operating a changeover switch, and it is also possible to achieve temperature control with the mix door fixed at a desired position.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional air conditioner for an automobile, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 21...Variable resistance for vehicle interior temperature setting (PTC),
22... Inside air sensor, 23... Outside air sensor, 25
...variable resistor (PBR) for detecting the position of the mixer door,
30... Fixed resistance, 31... Changeover switch, 40
...Differential amplifier.

Claims (1)

[Scope of claim for utility model registration] (1) A differential amplifier circuit that outputs an output according to the temperature difference between the temperature detected by the inside air sensor and the outside air sensor and the set temperature inside the vehicle, and a An air conditioner for an automobile having a mix door drive mechanism that drives a mix door depending on the opening degree, a fixed resistor provided in parallel to the inside air and outside air sensors connected in series, and the inside air and outside air sensor and the fixed resistor. 1. An air conditioner for an automobile, comprising a changeover switch for switching between a resistance and a resistance. (2) The vehicle according to claim 1, wherein the changeover switch is interlocked so that it is connected to the fixed resistor when the air conditioner switch is turned off. air conditioning equipment. (3) the selector switch is connected to the fixed resistor when the differential switch is turned on;
An air conditioner for an automobile according to claim (1) of the utility model registration claim, characterized in that the air conditioner is interlocked.