JP2009248608A - Air conditioning system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system for a vehicle capable of improving comfortability and reducing part cost. <P>SOLUTION: In the air conditioning system for the vehicle provided with a rotational frequency computing means S260 for computing rotational frequency of a blower 5 based on the generating number of surge voltage generated from a blower motor 6 for each prescribed time, an air conditioning control device 20 outputs information about cleaning or exchange of a filter 8 and corrects the rotational frequency of the blower 5 when there is a change by comparing the rotational frequency computed by the rotational frequency computing means S260 with rotational frequency computed the prescribed time before. Consequently, it is possible to improve the comfortability and to reduce the part cost. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner including a filter disposed in an air conditioning case, and more particularly to inspection and maintenance of a filter.

Conventionally, what is shown to patent document 1 is known as this kind of vehicle air conditioner, for example. That is, this apparatus includes a filter, a blower motor that drives the blower, detection means that detects power consumption or rotation speed of the blower motor, and a control circuit that controls the blower motor. When the detection means detects that the power consumption or the rotational speed of the blower motor changes when the filter is clogged, the passenger is notified by an inspection lamp or an inspection buzzer.
Japanese Patent Laid-Open No. 06-80019

  However, in the above-mentioned Patent Document 1, there is a problem that when a filter clogging is detected, only the filter clogging is notified, so that it is not always sufficient in terms of realizing a comfortable air-conditioning operation. For example, when the filter is clogged, there is a problem that comfort is impaired due to a decrease in the amount of air blown. In addition, by providing a separate detection means for detecting clogging of the filter, there is a problem that the cost of parts including the electric wire connecting the detection means and the control circuit is increased.

  By the way, this type of vehicle air conditioner has various operation modes. For example, in the air outlet mode, there are known face mode, bi-level mode, foot mode, foot defroster mode, and defroster mode. The electric power consumption or the rotational speed of the electric motor differs depending on the air outlet mode. However, in the above-mentioned Patent Document 1, a detailed description such as which operating mode the power consumption or the rotational speed of the blower motor should be compared with. Therefore, there is also a problem that the filter clogging cannot be detected accurately.

  Accordingly, a first object of the present invention is to provide a vehicle air conditioner that can improve comfort and reduce component costs. A second object is to provide a vehicle air conditioner that can accurately detect clogging of a filter.

In order to achieve the above object, the following technical means are adopted. That is, in the first aspect of the present invention, the air conditioning case (7) that forms the air passage, the air blowing means (5, 6) that pumps air into the air conditioning case (7), and the air conditioning case (7) In a vehicle air conditioner comprising: a filter (8) that is disposed in the filter and that filters air pumped from the blowing means (5, 6); and an air conditioning control means (20) that controls the blowing means (5, 6). ,
Rotational speed calculation means (S260) for determining the rotational speed of the blower means (5, 6) based on the number of occurrences of the surge voltage generated from the blower means (5, 6) every predetermined time is provided, and the air conditioning control means (20) outputs a notification of cleaning or replacement of the filter (8) when there is a change in comparison between the rotational speed obtained by the rotational speed calculating means (S260) and the rotational speed obtained a predetermined time ago. In addition, the rotational speed of the blower means (5, 6) is corrected.

  According to the present invention, a blower motor for a vehicle generally generates a surge voltage when a commutator in contact with a brush is switched for each segment. The number of revolutions can be obtained by measuring the number of occurrences of the surge voltage per time. Therefore, it is possible to calculate the rotation speed of the air blowing means (5, 6) without providing a separate detection means for detecting the rotation speed. Thereby, reduction of parts cost can be aimed at. In addition, when the filter (8) is clogged, the comfort can be improved by correcting the rotational speed of the air blowing means (5, 6).

  In the second aspect of the invention, the air conditioning control means (20) stores the rotational speed of the blower means (5, 6) obtained in advance or predetermined time when the rotational speed changes. It is characterized by correcting to the set value. According to this invention, even if the filter (8) is clogged, the rotational speed can be easily corrected.

  In the invention according to claim 3, the air conditioning control means (20) includes a plurality of air outlet modes for pumping conditioned air from the air conditioning case (7) toward the air outlet mounted in the vehicle interior, and air in the vehicle interior. Or it has the operation mode which consists of a suction port mode which introduces outside air into the air-conditioning case (7), and the rotation speed calculation means (S260) combines each of the suction port mode and the plurality of outlet modes. Based on the same operation mode, the number of rotations of the blowing means (5, 6) is calculated and compared.

  According to the present invention, when the suction port mode and the plurality of outlet modes are combined, at least 10 operation modes are conceivable. Since the ventilation resistance is different in each operation mode, the actual rotational speed of the air blowing means (5, 6) is different. Therefore, the change in the rotational speed can be accurately determined by obtaining the rotational speed of the blower means (5, 6) based on one of the same operation modes. Thereby, clogging of the filter (8) can be accurately detected.

  In the invention according to claim 4, the air conditioning control means (20) includes a plurality of outlet modes for pumping conditioned air from the air conditioning case (7) toward the outlet mounted in the passenger compartment, and the passenger compartment air. Or it has an operation mode consisting of a suction port mode for introducing outside air into the air conditioning case (7), and the rotation speed calculation means (S260) combines each of the blowout port modes with the inside air mode of the suction port mode. Based on the same operation mode, the rotational speed of the blowing means (5, 6) is calculated and compared.

  According to this invention, when the suction port mode of the inside air mode and the plurality of outlet modes are combined, at least five operation modes are conceivable. Since each of the five operation modes is the inside air mode, the rotational speed of the blowing means (5, 6) can be obtained without combining the above-described operation state at a vehicle speed of 0 km / h. Therefore, the clogging of the filter (8) can be accurately detected, and the rotation speed of the blower means (5, 6) can be calculated while the vehicle is traveling.

  In the fifth aspect of the present invention, the rotation speed calculating means (S260) is a predetermined voltage output from the air conditioning control means (20) to the blower means (5, 6) when the vehicle speed of the vehicle is 0 km / h. The number of rotations of the air blowing means (5, 6) is calculated on the basis of the operating state. According to this invention, the calculation accuracy of the rotational speed of the blower means (5, 6) is obtained by obtaining the rotational speed of the blower means (5, 6) based on the driving state consisting of a vehicle speed of 0 km / h and a predetermined voltage. Can be increased.

In the invention described in claim 6, the air conditioning case (7) forming the air passage, the air blowing means (5, 6) for pumping air into the air conditioning case (7), and the air conditioning case (7) are arranged. In a vehicle air conditioner provided with a filter (8) that is provided and filters the air pumped from the blowing means (5, 6) and an air conditioning control means (20) that controls the blowing means (5, 6).
A rotation speed calculation means (S260) for obtaining the rotation speed of the blower means (5, 6) is provided at predetermined time intervals. The air conditioning control means (20) is provided with a blower mounted in the vehicle compartment from the air conditioning case (7). It has an operation mode consisting of a plurality of outlet modes for pumping conditioned air toward the outlet, and a suction port mode for introducing vehicle interior air or vehicle exterior air into the air conditioning case (7),
The rotation speed calculating means (S260) is configured to send air blowing means from the air conditioning control means (20) in the same operation mode in which each of the inlet mode and the plurality of outlet modes is combined and when the vehicle speed of the vehicle is 0 km / h. While calculating the rotation speed of the air blowing means (5, 6) based on the operating state of the predetermined voltage output to (5, 6), the air conditioning control means (20) is operated by the rotation speed calculation means (S260). The obtained number of revolutions is compared with the number of revolutions obtained a predetermined time ago.

  According to the present invention, it is possible to accurately determine a change in the rotational speed. Thereby, clogging of the filter (8) can be accurately detected.

In the invention according to claim 7, the air conditioning case (7) forming the air passage, the air blowing means (5, 6) for pumping air into the air conditioning case (7), and the air conditioning case (7) are arranged. In a vehicle air conditioner provided with a filter (8) that is provided and filters the air pumped from the blowing means (5, 6) and an air conditioning control means (20) that controls the blowing means (5, 6).
A rotation speed calculation means (S260) for obtaining the rotation speed of the blower means (5, 6) is provided at predetermined time intervals. The air conditioning control means (20) is provided with a blower mounted in the vehicle compartment from the air conditioning case (7). It has an operation mode consisting of a plurality of outlet modes for pumping conditioned air toward the outlet, and a suction port mode for introducing vehicle interior air or vehicle exterior air into the air conditioning case (7),
The rotation speed calculation means (S260) is the same operation mode in which each of the outlet modes and the inside air mode of the suction port mode are combined, and the predetermined output that is output from the air conditioning control means (20) to the blower means (5, 6). On the basis of the operating state of the voltage, the rotation speed of the blower means (5, 6) is calculated, and the air conditioning control means (20) sets the rotation speed obtained by the rotation speed calculation means (S260) to a predetermined time before. It is characterized by comparing with the obtained rotation speed.

  According to this invention, the clogging of the filter (8) can be accurately detected, and the rotation speed of the blower means (5, 6) can be calculated while the vehicle is traveling.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

  Hereinafter, a vehicle air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a configuration diagram illustrating a schematic configuration of a vehicle air conditioner according to an embodiment. FIG. 2 is a flowchart of a control program for checking the degree of contamination of the filter. FIG. 3 is an explanatory diagram for explaining the operation of the DC motor.

  In the example shown in FIG. 1, the vehicle air conditioner 1 is divided into a blower unit 2 and an air conditioning unit 3. The blower unit 2 is arranged offset from the central part to the passenger seat side in the lower part of the instrument panel (instrument panel) in the passenger compartment, whereas the air conditioning unit 3 is lower in the instrument panel in the passenger compartment. Among these parts, it is arranged at a substantially central part in the vehicle left-right direction.

  The blower unit 2 is provided with an inside / outside air switching door 4 and a blower 5. The inside / outside air switching door 4 is a suction port switching means that is driven by an actuator (not shown) such as a servo motor to change the opening (so-called suction port mode) between the inside air introduction port 4a and the outside air introduction port 4b. .

  The inside air introduction port 4a is an introduction port for taking in vehicle interior air (inside air), and the outside air introduction port 4b is an introduction port for taking in vehicle interior air (outside air). The inside / outside air switching door 4 selectively opens and closes the inside air introduction port 4a and the outside air introduction port 4b according to the suction port mode. In the inside air mode, the inside / outside air switching door 4 opens the inside air introduction port 4a, and in the outside air mode, the outside air introduction port 4b is opened.

  The blower 5 is a blower that is driven to rotate by a blower motor 6 that is controlled by a blower motor drive circuit 14 and generates an air flow toward the vehicle interior in an air conditioning case 7 that forms the appearance of the air conditioning unit 3. That is, it is a blower that pumps air sucked from the blower unit 2 to an air passage in the air conditioning case 7. Here, the blower 5 and the blower motor 6 are referred to as blower means in the claims.

  The rotation speed of the blower 5 is determined according to the voltage applied to the blower motor 6 (blower voltage). That is, the blower 5 is rotated at the number of rotations corresponding to the applied voltage (blower voltage). The blower voltage is controlled based on a control signal from an air-conditioning control device 20 to be described later via the blower motor drive circuit 14.

  A filter 8 is disposed upstream of the air flow in the air conditioning case 7. The filter 8 is provided for the purpose of removing dust or the like that is about to enter the air conditioning case 7. The filter 8 filters the air blown from the blower 5. When the filter 8 is clogged, it is arranged so that it can be cleaned or replaced.

  An evaporator 9 including a refrigeration cycle is provided on the downstream side of the air flow of the filter 8. Here, the refrigeration cycle includes a compressor, a condenser, a liquid receiver, an expansion valve, and the evaporator 9 (not shown). Then, by turning on an electromagnetic clutch (not shown), the compressor is driven and the refrigerant circulates in the refrigeration cycle.

  The evaporator 9 is a cooling heat exchanger that exchanges heat with the refrigerant that flows in the air passing through the air conditioning case 7 and cools it. A heater core 11 is provided on the downstream side of the air flow of the evaporator 9. The heater core 11 is a heating heat exchanger that heats the air that has passed through the evaporator 9 by exchanging heat with engine cooling water.

  On the upstream side of the air flow of the heater core 11, a flat air mix door 10 that adjusts the mixing ratio of the cool air that flows around the heater core 11 and cool air flows through the heater core 11 and the warm air that flows through the heater core 11. Is rotatably arranged. The air mix door 10 is a blow temperature adjusting means that is driven by an actuator (not shown) such as a servo motor to adjust the blow temperature of the conditioned air blown into the vehicle interior.

  At the most downstream part of the air passage of the air conditioning case 7, a defroster blowing opening 13a for blowing conditioned air toward the front window glass of the vehicle, and a face blowing opening 13b for blowing conditioned air toward the upper body of the occupant And the foot blowing opening part 13c for blowing off an air-conditioning wind toward a passenger | crew's foot part is formed.

  A defroster door 12a, a face door 12b, and a foot door 12c are rotatably arranged on the upstream side of the outlet openings 13a, 13b, and 13c. These doors 12a, 12b, and 12c are blower outlet mode switching doors that are driven to rotate by an actuator (not shown) such as a common servomotor via a link mechanism (not shown).

  Further, the defroster outlet 13a is connected to a defroster outlet (not shown) provided in the vehicle via a defroster duct (not shown), and the temperature from the defroster outlet toward the inner surface of the front window glass of the vehicle. The conditioned air is blown out.

  The face outlet 13b is connected to a face outlet (not shown) provided in the vehicle via a face duct (not shown), and the conditioned air whose temperature is adjusted toward the upper body of the passenger from these face outlets. It is configured to blow out.

  Further, the foot outlet opening 13c is provided with a foot passage (not shown) in each of the left and right side walls of the air conditioning case 7, and a front seat foot passage (not shown) opens in the middle of the foot passage. ing. The front seat foot passage is configured to blow conditioned air toward the feet of the left and right passengers through a front seat foot duct (not shown) and a front seat foot outlet.

  Furthermore, a rear seat foot duct (not shown) and a rear seat foot outlet are connected to the end of the foot passage, and air conditioning is directed toward the feet of the left and right passengers through the rear seat foot outlet. It is configured to blow out the wind.

  Incidentally, as the outlet mode, there are a defroster mode, a foot defroster mode, a foot mode, a bi-level mode, and a face mode. In the defroster mode, the defroster blowing opening 13a is opened by the defroster door 12a. In the foot defroster mode, the foot blowout opening 13c and the defroster blowout opening 13a are opened by the foot door 12c and the defroster door 12a.

  In the foot mode, the foot blowing opening 13c is opened by the foot door 12c. In the bi-level mode, the face blowing opening 13b and the foot blowing opening 13c are opened by the face door 12b and the foot door 12c. In the face mode, the face blowing opening 13b is opened by the face door 12b.

  The air conditioning control device 20 includes a known microcomputer including a CPU, a ROM, a RAM, and the like, and peripheral circuits thereof. This air conditioning control device 20 stores a control program for air conditioning control in its ROM, and performs various calculations and processes based on the control program. The air conditioning controller 20 receives detection signals from a well-known air conditioning sensor group and various operation signals from an air conditioning operation panel (not shown). As an air conditioning sensor group, an inside air temperature sensor 21 that detects an inside air temperature (vehicle interior temperature), an outside air temperature sensor 22 that detects an outside air temperature (vehicle outside temperature), and a solar radiation amount sensor 23 that detects the amount of solar radiation incident on the vehicle interior. Etc. are provided.

  The air conditioning operation panel has a temperature setting switch for setting the temperature in the passenger compartment (not shown) to a desired temperature, a set temperature display for digitally displaying the temperature set by the temperature setting switch, and an auto command for instructing automatic control of the air conditioner Switch, off switch for commanding operation stop of air conditioner, inside / outside air switching switch for manually switching the inside / outside air mode, air conditioner switch for manually switching between operation (ON) and stop (OFF) of compressor, and air flow level of blower 5 An air volume setting switch that switches manually in stages, an air outlet changeover switch that manually switches the air outlet mode, and the like are provided.

  Further, the air conditioning operation panel is provided with a reset switch (not shown) to be operated when the filter 8 is cleaned or replaced, and a warning lamp (not shown) for notifying the timing of cleaning or replacement of the filter 8. It has been.

  The air conditioning control device 20 is provided with an air conditioning control program for automatically controlling the air conditioning device. As is well known, the blower voltage output to the blower motor drive circuit 14 is controlled based on the target blowout temperature TAO obtained from the air conditioning sensor group such as the sensors 21, 22, and 23. In the operation modes such as the suction port mode and the blowout port mode described above, the inside / outside air switching door 4 and the blowout doors 12a, 12b, 12c are automatically controlled based on the target blowout temperature TAO. .

  Further, the blower motor drive circuit 14 is provided with a function of reading a surge voltage (described later) generated in the blower motor 6 when the blower motor 6 is operated. Therefore, the blower motor drive circuit 14 is configured to output the read surge voltage to the air conditioning controller 20.

  By the way, the air-conditioning control apparatus 20 of this embodiment is provided with a control program for monitoring clogging of the filter 8. In this control program, the degree of clogging of the filter 8 is detected and notified to the occupant, and when the filter 8 is clogged, the rotational speed of the blower 5 is corrected.

  The operation of this embodiment will be described below based on the flowchart shown in FIG. First, when the auto switch of the air conditioning operation panel is in the ON state, an automatic operation of the air conditioner is started by turning on an ignition switch (not shown). In step S210, it is determined whether or not a reset switch (not shown) has been operated after the filter 8 has been cleaned or replaced. Here, the control process of the control program for monitoring the clogging of the filter 8 is started by operating the reset switch.

  In step S220, the rotational speed of the blower 5 and the operation mode at that time are stored as initial values. Here, one operation mode is generated among 10 operation modes in which the two suction port modes and the five outlet modes are combined. At this time, when the driving state of the vehicle and the air conditioner is in a predetermined state, or set to a predetermined state, the rotational speed (initial value) of the blower 5 is calculated.

  Here, the predetermined driving state is a state in which the vehicle speed is 0 km / h and the blower voltage is, for example, 8V. The reason why the vehicle speed is set to 0 km / h is that when the operation mode is set to the outside air mode, the rotational speed of the blower 5 varies depending on the vehicle speed, and thus the accurate rotational speed of the blower 5 cannot be detected. is there. That is, the detection in the state where the vehicle speed is 0 km / h is to eliminate the influence of the ventilation resistance in the air conditioning case 7.

  More specifically, the rotational speed of the blower 5 is calculated when a predetermined blower voltage is applied when the vehicle speed is 0 km / h, that is, when the vehicle is stopped. Although the predetermined blower voltage is 8 V here, the voltage value is not limited to this value.

  By the way, the rotational speed of the blower 5 is calculated based on the surge voltage generated from the blower motor 6. As shown in FIG. 3, the vehicle blower motor 6 is composed of a commutator 3a and a brush 3b. This kind of commutator 6a is provided to increase the number of segments. The blower motor 6 having such a configuration generates a surge voltage when the commutator 6a in contact with the brush 6b is switched for each segment when a blower voltage is applied.

  Moreover, the number of occurrences of the surge voltage is proportional to the number of segment divisions of the commutator 6a and the rotational speed of the blower 5. Therefore, it is possible to calculate the rotation speed of the blower 5 by measuring the number of occurrences of the surge voltage per time. Accordingly, in step S220, the rotational speed of the blower 5 is calculated based on the number of occurrences of the surge voltage read by the blower motor drive circuit 14.

  In the next step S230, the timer starts counting. Here, the predetermined time of the timer is, for example, about one month. For this reason, the timer continues to count even when the ignition switch is turned off. Further, when the count is continued, this control process is maintained until a predetermined time elapses.

  In step S240, it is determined whether or not a predetermined time set in advance has elapsed. Here, when the predetermined time has elapsed, in step S250, the operation mode stored in step S220 is forcibly set, and the predetermined operation state is further combined and read by the blower motor drive circuit 14. Read the number of occurrences of surge voltage.

  By the way, in each of the 10 operation modes, the rotational resistance of the blower 5 is different even if the blower voltage applied to the blower motor 6 is the same because the ventilation resistance of the air passage in the air conditioning case 7 is different. . Therefore, the correct rotational speed of the blower 5 can be obtained by forcibly setting the operation mode stored in step S220.

  Next, in step S260 which is a rotation speed calculation means, the rotation speed of the blower 5 is calculated based on the number of occurrences of the surge voltage. In step S270, the calculated current rotational speed is compared with the previous initial rotational speed. This determination is determination means for determining whether the degree of clogging of the filter 8 is a predetermined value or more or a predetermined value or less.

  Accordingly, in step S270, if the difference between the previous initial rotational speed and the current rotational speed is equal to or smaller than the predetermined value, it is determined that there is no change, and the process proceeds to step S300. If the difference between the previous rotation speed and the current rotation speed exceeds a predetermined value in step S270, it is determined that there is a change, and the process proceeds to step S280.

  In step S280, the passenger is notified of the clogging of the filter 8. Here, as a notification means, you may notify using a warning light etc. or a warning buzzer. In step S290, the rotational speed of the blower 5 is corrected. Specifically, the blower voltage applied to the blower motor 6 is corrected so that the previous rotation speed is obtained.

  Thereby, when the filter 8 is not clogged, that is, it can be increased to the previous blowing amount. Therefore, even if the filter 8 is clogged, the air flow rate can be increased, so that it is possible to prevent impairing comfort due to a decrease in the air flow rate.

  In step S290, the blower voltage is corrected so as to be the previous rotational speed. However, the blower voltage may be corrected to a preset value stored in advance. Then, the process proceeds to step S300. In step S300, the timer is reset and the process returns to step 230.

  According to the control process as described above, the number of occurrences of the surge voltage can be measured to easily calculate the number of revolutions without providing a separate detection means for detecting the number of revolutions of the blower 5. . Thereby, reduction of parts cost can be aimed at.

  Further, in step S270, a change in the rotational speed can be accurately determined by comparing the rotational speeds in the same operation mode. Therefore, the clogging of the filter 8 can be accurately detected. Furthermore, by adding a driving condition of a vehicle speed of 0 km / h to one of the generated driving modes, it is possible to increase the calculation accuracy of the rotation speed calculation means in step S260.

(Other embodiments)
In the above embodiment, when one of the ten operation modes is generated, the operation state of the vehicle and the air conditioner is in a predetermined state, or is set to a predetermined state. The number of rotations of the blower 5 is calculated, and when the operation state of the vehicle and the air conditioner is in a predetermined state by forcibly selecting one of the operation modes with a high probability of occurrence based on the target outlet temperature TA0, Alternatively, the rotational speed of the blower 5 may be calculated by setting to a predetermined state.

  For example, in summer, the operation mode of the face mode by the inside air mode can be selected. In winter, the foot mode operation mode can be selected in the inside air mode. Accordingly, it is possible to forcibly set the operation mode with a high probability of occurrence immediately after boarding and calculate the rotation speed of the blower 5 in a predetermined state in the operation mode.

  In the above-described embodiment, the rotational speed of the blower 5 is calculated by combining driving states with a vehicle speed of 0 km / h when one of the ten driving modes occurs. Alternatively, the number of rotations of the blower 5 may be calculated by selecting one of the operation modes in which the suction port mode in the inside air mode and the air outlet mode are combined, and combining the operation mode with a predetermined operation state.

  According to this, at least five operation modes are conceivable. Since both are in the inside air mode, the driving state at a vehicle speed of 0 km / h can be omitted. Thereby, the clogging of the filter 8 can be accurately detected, and the rotational speed of the blower 5 can be calculated while the vehicle is traveling.

It is a lineblock diagram showing the schematic structure of the air-conditioner for vehicles in one embodiment. It is a flowchart of the control program which checks the dirt condition of the filter in one Embodiment. It is explanatory drawing explaining the action | operation of the DC motor in one Embodiment.

Explanation of symbols

5 ... Blower (Blower)
6. Blower motor (blower means)
7 ... Air-conditioning case 8 ... Filter 20 ... Air-conditioning control device (air-conditioning control means)
S260: Rotational speed calculation means

Claims (7)

An air conditioning case (7) forming an air passage;
Air blowing means (5, 6) for pumping air into the air conditioning case (7);
A filter (8) disposed in the air conditioning case (7) and for filtering the air pumped from the blower means (5, 6);
In a vehicle air conditioner comprising air conditioning control means (20) for controlling the air blowing means (5, 6),
Rotational speed calculation means (S260) for obtaining the rotational speed of the blower means (5, 6) based on the number of occurrences of the surge voltage generated from the blower means (5, 6) every predetermined time is provided,
The air conditioning control means (20) compares the rotational speed obtained by the rotational speed computing means (S260) with the rotational speed obtained before the predetermined time, and when there is a change, the filter (8) A vehicle air conditioner that outputs a notification of cleaning or replacement and corrects the rotational speed of the blowing means (5, 6).   The air conditioning control means (20) corrects the rotational speed of the blower means (5, 6) to the rotational speed obtained before the predetermined time or a preset value stored when the rotational speed changes. The vehicle air conditioner according to claim 1, wherein: In the air conditioning control means (20), a plurality of air outlet modes for pumping conditioned air from the air conditioning case (7) toward the air outlet mounted in the passenger compartment, and air in the passenger compartment or air outside the passenger compartment are air-conditioned. It has an operation mode consisting of a suction port mode to be introduced into the case (7),
The said rotation speed calculating means (S260) calculates the rotation speed of the said ventilation means (5, 6) based on the same operation mode which combined each of the said suction inlet mode and the said several outlet mode. The vehicular air conditioner according to claim 1 or 2, wherein the comparison is performed. In the air conditioning control means (20), a plurality of air outlet modes for pumping conditioned air from the air conditioning case (7) toward the air outlet mounted in the passenger compartment, and air in the passenger compartment or air outside the passenger compartment are air-conditioned. It has an operation mode consisting of a suction port mode to be introduced into the case (7),
The rotation speed calculation means (S260) calculates the rotation speed of the air blowing means (5, 6) based on the same operation mode in which each of the air outlet modes and the inside air mode of the air inlet mode are combined. The vehicle air conditioner according to claim 1 or 2, wherein the vehicle air conditioner is compared.   The rotation speed calculation means (S260) is based on the operating state of a predetermined voltage output from the air conditioning control means (20) to the blower means (5, 6) when the vehicle speed is 0 km / h. The vehicle air conditioner according to claim 3 or 4, wherein the rotational speed of the blower means (5, 6) is calculated. An air conditioning case (7) forming an air passage;
Air blowing means (5, 6) for pumping air into the air conditioning case (7);
A filter (8) disposed in the air conditioning case (7) and for filtering the air pumped from the blower means (5, 6);
In a vehicle air conditioner comprising air conditioning control means (20) for controlling the air blowing means (5, 6),
A rotation speed calculation means (S260) for obtaining the rotation speed of the air blowing means (5, 6) is provided every predetermined time,
In the air conditioning control means (20), a plurality of air outlet modes for pumping conditioned air from the air conditioning case (7) toward the air outlet mounted in the passenger compartment, and air in the passenger compartment or air outside the passenger compartment are air-conditioned. It has an operation mode consisting of a suction port mode to be introduced into the case (7),
The rotation speed calculation means (S260) is configured to control the air conditioning control means (20) when the same operation mode in which each of the suction port mode and the plurality of outlet modes is combined and the vehicle speed of the vehicle is 0 km / h. ) To calculate the rotational speed of the blowing means (5, 6) based on the operating state of the predetermined voltage output to the blowing means (5, 6) from
The vehicle air conditioner is characterized in that the air conditioning control means (20) compares the rotational speed obtained by the rotational speed calculating means (S260) with the rotational speed obtained before the predetermined time. An air conditioning case (7) forming an air passage;
Air blowing means (5, 6) for pumping air into the air conditioning case (7);
A filter (8) disposed in the air conditioning case (7) and for filtering the air pumped from the blower means (5, 6);
In a vehicle air conditioner comprising air conditioning control means (20) for controlling the air blowing means (5, 6),
A rotation speed calculation means (S260) for obtaining the rotation speed of the air blowing means (5, 6) is provided every predetermined time,
In the air conditioning control means (20), a plurality of air outlet modes for pumping conditioned air from the air conditioning case (7) toward the air outlet mounted in the passenger compartment, and air in the passenger compartment or air outside the passenger compartment are air-conditioned. It has an operation mode consisting of a suction port mode to be introduced into the case (7),
The rotation speed calculation means (S260) is the same operation mode combining each of the outlet modes and the inside air mode of the suction port mode, and the air blowing means (5, 6) from the air conditioning control means (20). And calculating the rotational speed of the blowing means (5, 6) based on the operating state of the predetermined voltage output to
The vehicle air conditioner is characterized in that the air conditioning control means (20) compares the rotational speed obtained by the rotational speed calculating means (S260) with the rotational speed obtained before the predetermined time.

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