JP2682288B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for controlling air conditioning conditions based on a detected value of a vehicle interior temperature.

[0002]

2. Description of the Related Art An air conditioner for a vehicle of this type is provided with an indoor temperature sensor for detecting a vehicle interior temperature, and a value obtained by multiplying the detected vehicle interior temperature by a predetermined gain and a preset temperature set manually beforehand. Based on the above, a well-known blower fan and an air mix door are controlled so that the actual vehicle interior temperature approaches the set temperature (for example, Nissan Motor Co., Ltd. Service Weekly Report No. 578, issued in June 1987). .

[0003]

However, in the conventional air conditioner, the gain of the passenger compartment temperature detected by the passenger compartment temperature sensor is set to be high in order to improve the control response under all conditions. As shown in FIG. 11, an indoor temperature sensor 44 is provided in the vicinity of the vent outlet 7 of the instrument panel 72, and detects the vehicle interior temperature by the air introduced from the opening 72a provided in the instrument panel 72. In some cases, there are the following inconveniences.

Now, it is assumed that warm air is being blown from the foot outlet 11 and the difference between the vehicle interior temperature and the set temperature is less than a predetermined value (hereinafter referred to as the heating stable period). At this time, for example, when the window glass 71 is opened, the indoor temperature sensor 44 provided in the instrument panel immediately reacts to the outside air (cold air) that has entered the vehicle interior, and the detected value thereof sharply drops. Then, since a higher gain is applied to the detected value, the air mix door door is driven to the hot side as shown by the solid lines in FIGS. 8B and 8C, and the outlet temperature rises sharply. The fan voltage, that is, the blower fan air volume, also increases rapidly. As a result, since a large amount of warm air is blown out from the foot outlet, the detection value of the indoor temperature sensor 44 becomes high again, the air mix door opening is driven to the cool side, and the blowout temperature decreases, and the blower fan air flow rate increases. Also decreases. That is,
The blowing temperature and the blower fan air volume fluctuate drastically (hereinafter referred to as hunting), which gives an occupant an unpleasant feeling.

On the other hand, a fresh vent passage for guiding the air (cold air) from the blower fan to the vent outlet 7 without passing through the heater core and an opening / closing door for opening / closing the fresh vent passage are provided. An air conditioner is known in which cold air that has passed through the fresh vent passage is blown out from the vent outlet 7 in the state (for example,
Nissan Motor Co., Ltd. New model manual R10-1 19
Published June 1990). In such an air conditioner, even when the open / close door is opened at the time of stable heating as described above, the room temperature sensor 44 is provided in the cold air blown out from the vent outlet 7.
Reacts immediately, and the detected value drops sharply, causing the same problem as described above.

An object of the present invention is to provide a vehicle air conditioner which prevents hunting of the blowout temperature and the blower fan air volume during the heating stable period.

[0007]

The present invention will be described with reference to FIG. 1, which is a diagram corresponding to claims. The present invention is directed to an interior temperature sensor 101 for detecting the interior temperature of a vehicle from the air introduced into an interior of an instrument panel. And a gain setting means 102 for setting a gain to be applied to the detected vehicle interior temperature, and the detected vehicle interior temperature based on the gained vehicle interior temperature and the manually set temperature. Control means 10 for controlling the air conditioning conditions so that
3 is applied to a vehicle air conditioner. Then, the environment determination means 104 for determining whether or not the temperature detected by the indoor temperature sensor 101 is in a predetermined environment in which the temperature suddenly decreases, and whether or not the difference between the set temperature and the detected vehicle interior temperature is a predetermined value or less. The above problem is solved by providing the temperature determining means 105 for determining whether or not and configuring the gain setting means 102 as follows. That is, the gain setting means 102 gives the output of the indoor temperature sensor 101 when it is determined that the difference between the set temperature and the detected vehicle interior temperature is less than or equal to a predetermined value, and that it is under the predetermined environment. Make the gain smaller than usual. Further, in particular, the invention of claim 2 is configured such that the environment determining means 104 is configured to detect that the temperature detected by the indoor temperature sensor 101 has decreased by a predetermined value or more within a predetermined time and determine that the environment is under a predetermined environment. is there. Further, the invention of claim 3 further comprises a fresh vent passage for guiding the cool air to the vent outlet, and an opening / closing door for opening / closing the fresh vent passage, and detecting that the opening / closing door is in an open state, and under the predetermined environment. The environment determining means 104 is configured to determine that Furthermore, in the invention of claim 4, the control means 103 is configured to control the air conditioning condition by controlling the air volume of the blower fan based on the vehicle interior temperature to which the gain is given and the preset temperature. It is a thing. The invention of claim 5 is
The air mix door is further provided for controlling the blowout temperature by adjusting the amount of air passing through the heater core, and the opening of the air mix door is based on the vehicle interior temperature to which the gain is given and the preset temperature. The control means 103 is configured to control the air conditioning conditions by controlling the control.

[0008]

The difference between the set temperature and the vehicle interior temperature detected by the indoor temperature sensor 101 is determined to be a predetermined value or less, and the temperature detected by the indoor temperature sensor 101 is determined to be rapidly reduced. If it is done, the gain setting means 102
Causes the gain given to the output of the indoor temperature sensor 101 to be smaller than usual. As a result, even if, for example, the window glass is opened during the stable heating period and the indoor temperature sensor immediately responds and the detected value drops sharply, the air mix door does not suddenly move to the hot side and blows out. Not only a rapid increase in temperature is prevented, but also a rapid increase in blower fan airflow is prevented. That is, rapid changes in heating conditions (hunting) are prevented. Further, particularly in the invention of claim 2, the environment determining means 104 determines that the temperature is a predetermined environment by detecting that the temperature detected by the indoor temperature sensor 101 has decreased by a predetermined value or more within a predetermined time. Further, in the invention of claim 3, the environment determining means 104 determines that the predetermined environment is present by detecting that the opening / closing door that opens / closes the fresh vent passage is in an open state. Further, in the invention of claim 4, the control means 103 controls the air conditioning condition by controlling the air volume of the blower fan based on the vehicle interior temperature to which the gain is given and the preset temperature. In the invention of claim 5,
The control unit 103 controls the air conditioning condition by controlling the opening degree of the air mix door based on the vehicle interior temperature to which the gain is applied and the preset temperature.

[0009]

【Example】

—First Embodiment— A first embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows the configuration of the vehicle air conditioner according to the present invention.
As is well known, a blower fan 2, an evaporator 3, a heater core 4, an air mix door 5 are provided in the air conditioning duct 1, and a vent having a center vent outlet 7C and left and right side vent outlets 7L, 7R is provided. An air outlet 7 and a foot air outlet 11 are provided. The air mix door 5 controls the blowout temperature by adjusting the amount of air passing through the heater core 4. In addition, vent outlet 7
Is to blow air to the upper body of the occupant, and the foot outlet 11 is to blow air to the feet of the occupant. And
The vent from the vent outlet 7 is controlled by opening and closing the vent door 8, and the vent from the foot outlet 11 is controlled by the foot door 12.
It is controlled by the open / close control of each.

FIG. 3 shows an example of the control unit 40 of the vehicle air conditioner according to the present invention. A control circuit 41 (hereinafter, simply referred to as CPU 41) including a CPU, a ROM, a RAM, and the like, via an input circuit 42, an outside air temperature sensor 43 that detects an outside air temperature Tamb, and an indoor temperature sensor 44 that detects a vehicle interior temperature Tinc. (The temperature inside the vehicle is detected by the air that is installed near the vent outlet 7 of the instrument panel 72 as shown in FIG. 11 and that is introduced from the opening 72a provided in the instrument panel 72), and the amount of solar radiation Qsun is detected. An insolation sensor 45 and an air mix door opening sensor 46 for detecting the opening X of the air mix door 11 are connected, and various temperature information and heat quantity information are C from these sensors 43 to 46.
It is input to the PU 41.

Further, the CPU 41 is provided with an intake actuator 50, an air mix door actuator 51, and a vent door actuator 52 via an output circuit 49.
V, foot door actuator 52F, defroster door actuator 52D and blower fan control circuit 54
The blower fan motor 2M is connected to the blower fan control circuit 54.

The CPU 41 drives and controls various actuators such as the air mix door actuator 51 based on various information input from the sensors 43 to 47 to control the blowout temperature and the blowout port. Further, the blower fan motor 2M is drive-controlled by the blower fan control circuit 54 by the blower amount control signal to appropriately control the blower amount of the blower fan 2.

Next, the operation of the embodiment will be described. Figure 4 is CP
It is a flow chart which shows basic control of an air-conditioning control device performed by U41. In step S10, initialization is performed, and in the normal auto air conditioner mode, for example, the set temperature Tptc is initialized to 25 ° C. Step S20
Then, input various information from each sensor.

The data information of each of these sensors will be specifically described. The set temperature Tptc is obtained from a control panel (not shown), the vehicle interior temperature Tinc is obtained from the indoor temperature sensor 44, the outside air temperature Tamb is obtained from the outside air temperature sensor 43, and the amount of solar radiation. Qs
un is given from the solar radiation sensor 45, respectively.

Next, in step S30, the outside air temperature sensor 4
The outside air temperature Tamb obtained from No. 3 is processed to a value Tam corresponding to the actual outside air temperature by removing influences from other heat sources. In step S40, the solar radiation amount information as the light amount from the solar radiation sensor 45 is processed into a value Q'sun as a heat amount suitable for the subsequent conversion. In step S50, the set temperature Tptc set on the control panel is processed to a value T'ptc corrected according to the outside air temperature. In step S60, the target outlet temperature Xm is calculated from T'ptc, Tinc, Tam, Q'sun, and the target outlet temperature Xm is calculated, as will be described later in detail.
The actual opening degree of the air mix door 11 is controlled according to the above.

In step S70, a compressor (not shown) that pressure-feeds the refrigerant to the evaporator 3 is controlled. In step S80, the actuators 52V, 52F, 52D
To control each outlet. That is, this type of air conditioner has, as the air outlet mode, a vent mode in which air is blown from the vent outlet 7, a foot mode in which air is blown from the foot outlet 11 and a diff mode in which air is blown from a defroster air outlet (not shown). In addition to being settable, a bi-level mode (hereinafter, B / L mode) in which air is blown from both the vent outlet 7 and the foot outlet 11 is also settable.

Next, in step S90, an intake door (not shown) is driven by the intake door actuator 50 to control the selective switching of the intake port, that is, the outside air introduction port and the inside air introduction port. In step S100, the blower fan 2 is controlled to control the air volume from the air outlet. Thereafter, the process returns to step S20.

5 and 6 are subroutine flowcharts showing the details of the air mix door control (step S60) described above. First, the constants A to C are initialized in step S601 of FIG. 5, and then, in step S602, the current air mix door opening X is input by the signal of the air mix opening sensor 46. In step S603, the outside air temperature Tamb detected by the outside air temperature sensor 43 is 20 ° C.
It is determined whether or not: This is a judgment as to whether it is heating or cooling. When the outside air temperature is higher than 20 ° C., it is determined that the cooling is being performed, and the routine proceeds to step S604, where variables D and E are set to normal values, that is, 5.1 and -1.92, respectively, and the routine proceeds to step S607. Here, the variable D corresponds to the gain given to the vehicle interior temperature Tinc when the target blowout temperature Xm is calculated by the equation described later.

If it is determined in step S603 that the outside air temperature is 20 ° C. or lower, it is determined that heating is in progress, and step S6 is performed.
In step 05, it is determined whether the difference between the set temperature T'ptc and the passenger compartment temperature Tinc exceeds 3 ° C (T'ptc-Tinc> 3). If step S605 is positive, step S605
At 606, the variable D is set to 6.1 and the variable E is set to -7.92, and the process proceeds to step S607. That is, T'ptc-Tin
c> 3 means that the vehicle interior temperature is much lower than the set temperature, so the vehicle interior temperature T should be increased in order to improve the heating performance.
Set inc gain higher.

On the other hand, if step S605 is denied,
That is, when the vehicle interior temperature is close to the set temperature, the process proceeds to step S607 in FIG. 6 and it is determined whether the timer is operating. If it is in operation, the process proceeds to step S610, and if it is not in operation, the timer is started in step S608, and in step S609, the vehicle interior temperature Tinc detected at this time is assigned to the variable T'inc and step S610. Proceed to. In step S610, it is determined whether or not 5 seconds have elapsed from the start of the timer operation. If negative, the process proceeds to step S604 in FIG. 5, and if affirmative, the process proceeds to step S611.

In step S611, the timer is stopped, the timer is reset in step S612, and the process proceeds to step S613, where the previous vehicle interior temperature T'inc obtained in step S609 and the currently detected vehicle interior temperature Tinc are set. It is determined whether or not the difference is 2 ° C or more. Step S
If 613 is denied, the process proceeds to step S604 in FIG. 5, and if affirmed, the variables D and E are set to 2.
5 and -5.5, respectively, and the process proceeds to step S615 in FIG. That is, the gain given to the detected temperature of the indoor temperature sensor 44 is made smaller than the normal value mentioned above. Here, T'inc is the vehicle interior temperature at the time when the timer is started, that is, 5 seconds before, so that the affirmative determination in step S613 indicates that the vehicle interior temperature has dropped by 2 degrees or more within 5 seconds. This can happen, for example, when the windshield is opened.

In step S615, the target outlet temperature Xm is obtained based on Xm = (A + D) T'ptc + B.Tam + C.Q'sun-D.Tinc + E, and then step S615.
At 616, the deviation S between the target outlet temperature Xm and the actual air mix door opening X (the value read in step S602) is obtained by S = Xm-X.

Then, in step S617, the deviation S is compared with a predetermined value So. If S <-So, then in step S618, the air mix door opening is set to the cold side, that is, to the closed side so that the flow rate of air passing through the heater unit 10 decreases. If S> + So, step S
At 619, the opening degree of the air mix door is set to the hot side, that is, the open side so that the air flow rate passing through the heater unit 10 increases. If | S | ≦ + So, step S62
At 0, the current opening is maintained.

FIG. 7 is a subroutine flow chart showing details of the air volume setting control in step S100 (FIG. 4). In FIG. 7, first, in step S101, it is determined whether or not the air volume is commanded by an air volume setting switch (not shown). When step S101 is affirmed, the routine proceeds to step S102, where the blower fan applied voltage V is determined according to the operation of the air volume setting switch, and the step S104
Proceed to. When step S101 is denied, in step S103, the blower fan applied voltage V is obtained from the characteristic shown in the figure based on the target air mix opening degree Xm calculated in step S607 of FIG.
Proceed to 4. In step S104, the applied voltage V determined in step S102 or S103 is applied to the blower fan motor 2M via the blower fan control circuit 54. As a result, the blower fan 2 is driven with an air volume according to the applied voltage.

According to the above procedure, when the temperature is heating and the difference between the set temperature T'ptc and the detected value Tinc of the vehicle interior temperature is less than the predetermined value, the vehicle interior temperature is 2 degrees or more within 5 seconds. When it is detected that the temperature has dropped (when it is determined that the temperature detected by the indoor temperature sensor 44 is in a predetermined environment in which it suddenly drops), the gain given to the output of the indoor temperature sensor 44 is made smaller than usual. It Then, using the value obtained by multiplying the vehicle interior temperature Tinc by the gain, the target blowout temperature Xm is obtained by the above equation, and the actual air mix door opening is controlled accordingly.

Therefore, even if, for example, the window glass is opened during the stable heating period and the indoor temperature sensor 44 immediately reacts to cold air and its detected value sharply drops, the value obtained by multiplying Tinc by the gain is shown in FIG. ), The air mix door opening degree changes gently as shown in FIG. 8 (b), so that a sudden rise and fall of the blowout temperature is prevented. Further, since the blower fan applied voltage V, that is, the blower fan air volume is controlled based on the target blowout temperature Xm, the blower fan air volume also changes gently as shown in FIG. 8C.

In the configuration of the above embodiment, the CPU 41
The CPU 41, the air mix door actuator 51, and the blower fan control circuit 54 configure the gain setting means 102, the environment determination means 104, and the temperature determination means 105, respectively.

-Second Embodiment- Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 9 shows the configuration of a vehicle air conditioner according to the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. In addition to the configuration shown in FIG. 2, a fresh vent passage 6 that bypasses the heater core 4 is provided in the air conditioning duct 1. The fresh vent passage 6 is provided so as to guide the air downstream of the evaporator 3 to the passage 9 between the vent outlet 7 and the vent door 8, and the fresh vent passage 6 has a fresh vent door ( An opening / closing door) 10 is provided. Control circuit 41
(FIG. 3) shows that when the fresh vent switch 47 is turned on, the fresh vent door 10 is fully opened via the fresh vent door actuator 53, and when the switch 47 is off, depending on the air mix door opening degree. The opening degree of the fresh vent door 10 is controlled. When the air mix door is fully closed during cooling (the position shown by the solid line in the figure), the fresh vent door 10 is fully opened.

Here, in such an air conditioner, the air that has passed through the air mix door 5 (the mixed air of the air A heated by the heater core 4 and the air B not heated) is blown out from the foot outlet. The air that has passed through the air mix door 5 and the fresh vent passage 6 (the mixed air of the above-mentioned air A and B and the air C passing through the fresh vent passage 6) is blown out from the vent outlet 7 to achieve the effect of head cold foot heat. There is.

Next, the procedure of air mix door control by the control circuit 51 will be described with reference to the flowchart of FIG. The same steps as those in FIG. 5 will be assigned the same step numbers, and the description will focus on the differences. Step S60
When 3 is affirmed, the process proceeds to step S605A, and it is determined whether or not the difference between the set temperature Tptc and the vehicle interior temperature T'inc exceeds 6 ° C (whether T'ptc-Tinc> 6). Step S
If 605A is affirmed, the process proceeds to step S606, and if not, the process proceeds to step S605B. Step S605
In B, the difference between the set temperature T'ptc and the passenger compartment temperature Tinc is 3
It is determined whether the temperature is lower than C (whether T'ptc-Tinc <3 or not), and if negative, the process proceeds to step S604, and if positive, the process proceeds to step S631. In step S631, it is determined whether the D / F1 mode is set as the outlet mode and the fresh vent door 10 is fully opened. here,
The D / F1 mode is a mode in which air is blown from both a defroster outlet (not shown) for removing window fog and the foot outlet 11, and is set during heating.
Therefore, affirmative determination in step S631 indicates that the fresh vent door 10 is fully opened by turning on the fresh vent switch 47.

If step S631 is denied, the routine proceeds to step S604, where the variables D and E are set to normal values, and if affirmed, the variables D and E are set to values 2.5, -5. Set to 5, respectively.

According to the above procedure, the gains D and E given to the temperature detected by the indoor temperature sensor 44 become smaller than usual when the fresh vent door 10 is fully opened during the heating stable period. That is, normally D = 5.1 and E = -1.
What was 92 becomes D = 2.5 and E = -5.5. Here, FIG. 11 shows the set temperature T'ptc and the room temperature Tin.
It is a figure which shows the change of the target blowing temperature Xm with respect to the change of difference (DELTA) T of c, when both the outside air temperature Tam and the solar radiation amount Qsun are set to zero, and set temperature T'ptc is made into a fixed value. L1 is D = 5.1 and E = -1.92,
That is, the characteristic when the fresh vent door 10 is closed is shown, and L2 shows the characteristic when D = 2.5 and E = -5.5, that is, the characteristic when the fresh vent door 10 is opened. Now, consider a case where the fresh vent door 10 changes from closed to open when ΔT is zero (heating stable period). When the fresh vent door 10 is opened, the detected value T of the room temperature
If inc decreases by 3.5 degrees, for example, ΔT increases by 3.5 degrees. At this time, if the characteristic of L1 is used, the target outlet temperature Xm becomes Xm1 in the figure. On the other hand, when the characteristic of L2 is used when the fresh vent door 10 is opened to closed as in this embodiment, the target outlet temperature Xm after the indoor temperature change is Xm2 (<Xm1).
After that, Xm gradually rises as compared with L1 as ΔT rises.

Therefore, even when the indoor temperature sensor 44 immediately reacts to the cold air from the vent outlet 7 and the detected value sharply drops, the air mix door door changes gently without hunting as in the above. The sudden rise and fall of the blowout temperature are prevented. Further, since the blower fan applied voltage, that is, the air volume is controlled based on the target blowout temperature Xm by the control of FIG. 7, the air volume of the blower fan changes gently as shown in FIG.

In the above description, the heating stable period is determined when the difference between the set temperature Tptc and the vehicle interior temperature Tinc is 3 ° C. or less, but this is not limited to 3 ° C. Further, the specific numerical values of the gains (variables D and E) given to the vehicle interior temperature Tinc are not limited to the examples.

[0035]

According to the present invention, when it is determined that the temperature detected by the indoor temperature sensor is suddenly lowered when the difference between the set temperature and the detected vehicle interior temperature is less than a predetermined value. Since the gain given to the output of the indoor temperature sensor is made smaller than usual, the detected value of the indoor temperature sensor suddenly increases due to, for example, opening of the wind glass or activation of the fresh vent system during the heating stable period. Even when the air temperature drops to 0, the air mix door is not suddenly driven to the hot side, the blow temperature is prevented from rising rapidly, and the blower fan air volume is also prevented from increasing rapidly. That is, the heating conditions do not change suddenly (hunting), and the passengers are prevented from feeling uncomfortable.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims.

FIG. 2 is a configuration diagram of a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 3 is a block diagram showing a control system of the air conditioner.

FIG. 4 is a main flowchart.

FIG. 5 is a subroutine flow chart showing details of air mix door opening control.

FIG. 6 is a flowchart following FIG. 5;

FIG. 7 is a subroutine flowchart showing details of blower fan air volume control.

FIG. 8 is a time chart showing a temporal change in a value obtained by adding a gain to an output of an indoor temperature sensor, an air mix door opening degree, and a blower fan air flow rate.

FIG. 9 is a configuration diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 10 is a subroutine flowchart showing details of air mix door opening control.

FIG. 11 is a characteristic diagram showing a change in a target outlet temperature with respect to a change in a difference between a set temperature and an indoor temperature.

FIG. 12 is a diagram illustrating a conventional problem.

[Explanation of symbols]

 2 Blower fan 2M Blower fan motor 3 Evaporator 4 Heater core 5 Air mix door 6 Fresh vent passage 7 Vent outlet 8 Vent door 10 Fresh vent door 11 Foot outlet 12 Foot door 41 CPU 44 Indoor temperature sensor 47 Air mix door opening sensor 51 air mix door actuator 53 fresh vent door actuator 54 blower fan control circuit 101 indoor temperature sensor 102 gain setting means 103 heating control means 104 temperature determination means 105 environment determination means

Claims (5)

(57) [Claims] 1. An indoor temperature sensor for detecting a vehicle interior temperature by air inside a vehicle compartment introduced through an opening provided in an instrument panel, and a gain setting means for setting a gain to be applied to the detected vehicle interior temperature. A vehicle air conditioner comprising: a control unit that controls an air conditioning condition such that the detected vehicle interior temperature becomes the set temperature based on the vehicle interior temperature to which the gain is applied and a manually set temperature. , An environment determining means for determining whether or not the temperature detected by the indoor temperature sensor is in a predetermined environment in which the temperature suddenly decreases, and whether or not a difference between the set temperature and the detected vehicle interior temperature is a predetermined value or less. The temperature determining means for determining and the gain setting means, when the difference between the set temperature and the detected vehicle interior temperature is determined to be a predetermined value or less, and when it is determined that the predetermined environment The vehicle air conditioner is characterized in that the gain given to the output of the indoor temperature sensor is made smaller than usual. 2. The environment determining means detects that the temperature detected by the indoor temperature sensor has decreased by a predetermined value or more within a predetermined time and determines that the environment is the predetermined environment. The vehicle air conditioner described in. 3. A fresh vent passage for guiding cold air to the vent outlet, and an opening / closing door for opening and closing the fresh vent passage, wherein the environment determining means detects that the opening / closing door is in an open state. The vehicle air conditioner according to claim 1, wherein it is determined that the vehicle is in the predetermined environment. 4. The control means controls the air conditioning condition by controlling the air volume of a blower fan based on a vehicle interior temperature to which the gain is given and a preset temperature. The vehicle air conditioner according to any one of claims 1 to 3. 5. An air mix door for controlling the blowout temperature by adjusting the amount of air passing through the heater core, wherein the control means has a vehicle interior temperature to which the gain is applied and a preset temperature. The vehicle air conditioner according to any one of claims 1 to 3, wherein the air conditioning condition is controlled by controlling the opening degree of the air mix door based on the above.