JP5455760B2 - Air purification device - Google Patents

Description

  The present invention relates to an air purification device.

  In recent years, with increasing awareness of environmental problems, an air purification apparatus using a catalyst that purifies chemical substances in the air, such as ozone, may be mounted on a vehicle. As the vehicle travels, the air flows in contact with the air purification device and is purified.

  Patent Document 1 discloses an air purification device mounted on a radiator in which a catalyst is coated on a metal. Patent Document 2 discloses a sensor element that ensures air circulation.

Special table 2003-527951 gazette JP 2002-139472 A

  However, in the conventional air purification device, the purification function of the catalyst may be deteriorated. An object of this invention is to provide the air purification apparatus which can improve the purification function of a catalyst in view of the said subject.

  The present invention comprises a catalyst made of metal and purifying a chemical substance in the atmosphere, an energizing means for energizing the catalyst, and a resistance measuring means for measuring the electric resistance of the catalyst, the resistance measuring means When the temperature of the catalyst estimated based on the electrical resistance measured by the above is lower than the activation temperature of the catalyst, the energization means energizes the energization so that the temperature of the catalyst rises to the activation temperature It is. According to the present invention, by energizing the catalyst, the temperature of the catalyst can be raised to the activation temperature, and the purification function of the catalyst can be enhanced. Further, the temperature of the catalyst can be grasped with a simple configuration.

  In the above configuration, a purification function diagnosing means for diagnosing the purification function of the catalyst based on the electrical resistance measured by the resistance measuring means can be provided. According to this configuration, the self-diagnosis of the purification function can be performed with a simple configuration.

  In the above configuration, when the purification function diagnosis unit diagnoses that the purification function of the catalyst is abnormal, the energization unit performs energization to restore the purification function of the catalyst and restores the purification function of the catalyst. The energization to do so may be configured to increase the temperature of the catalyst to such a temperature that the purification function of the catalyst is restored. According to this configuration, it is possible to perform self-diagnosis of the purification function and recovery of the purification function with a simple configuration.

  In the above configuration, when the purification function diagnosis unit diagnoses that the purification function of the catalyst is abnormal, the energization unit performs energization to restore the purification function of the catalyst and restores the purification function of the catalyst. The energization to do so may be a configuration that causes electrolysis of the oxide generated in the catalyst. According to this configuration, it is possible to perform self-diagnosis of the purification function and recovery of the purification function with a simple configuration.

  In the above configuration, the vehicle includes a travel distance measuring unit that measures a travel distance of a vehicle on which the air purification device is mounted, or an operation time measurement unit that measures an operation time of the engine of the vehicle, and is measured by the travel distance measuring unit. When the measured travel distance becomes a predetermined distance, or when the operation time measured by the operation time measurement means reaches a predetermined time, the energization means changes the temperature of the catalyst to the catalyst purification function. It can be set as the structure which supplies with electricity so that it may raise to the temperature which recovers. According to this configuration, the poisoning component of the catalyst can be desorbed and the purification function can be recovered.

  In the above configuration, the apparatus includes a speed measuring unit that measures a speed of a vehicle on which the air purification device is mounted, and when the speed measured by the speed measuring unit is larger than a first speed, the energizing unit It can be set as the structure which supplies with electricity so that it may raise. According to this configuration, the temperature of the catalyst can be increased more easily. In addition, the air can be purified more efficiently.

  In the above configuration, the energization means may be configured to energize so as to cause the electrolysis when in contact with a liquid for electrolyzing the oxide generated in the catalyst. According to this configuration, the purification function of the catalyst can be recovered by performing electrolysis by energization.

  The said structure WHEREIN: The said electrolyte solution can be set as the structure which is rain water or the washer liquid sprayed by the vehicle by which the said air purification apparatus is mounted.

  In the above configuration, the apparatus includes a speed measuring unit that measures a speed of a vehicle on which the air purification device is mounted, and the energizing unit energizes when the speed measured by the speed measuring unit is smaller than a second speed. can do. According to this configuration, the purification function can be recovered during low-speed traveling with a low purification function, and the purification can be performed during high-speed traveling with a high purification function, thereby enabling efficient purification.

  The said structure WHEREIN: When the said purification function diagnostic means diagnoses that the purification function of the said catalyst is abnormal, the said electricity supply means can be set as the structure which supplies with electricity. According to this configuration, it is possible to perform self-diagnosis of the purification function and recovery of the purification function with a simple configuration.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the air purification apparatus which can improve the purification function of a catalyst.

FIG. 1A is a schematic view illustrating the configuration of the air purification device according to the first embodiment, and FIG. 1B is a functional block diagram illustrating the configuration of the air purification device according to the first embodiment. FIG. 2A and FIG. 2B are flowcharts illustrating the control of the air purification device according to the first embodiment. FIG. 3 is a flowchart illustrating the control of the atmospheric control device according to the second embodiment. FIG. 4 is a flowchart illustrating the control of the atmospheric control apparatus according to the second embodiment. 5A and 5B are diagrams illustrating the relationship between the travel distance and the purification function, and FIG. 5C is a diagram illustrating the relationship between the vehicle speed and the ozone purification amount of the catalyst. FIG. 6 is a flowchart illustrating the control of the atmospheric control apparatus according to the third embodiment.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of the air purification device according to the first embodiment will be described. FIG. 1A is a schematic view illustrating the configuration of the air purification device according to the first embodiment, and FIG. 1B is a functional block diagram illustrating the configuration of the air purification device according to the first embodiment.

  As shown in FIG. 1A, an air purification apparatus 1 according to the first embodiment includes an ECU (Engine Control Unit) 2, a catalyst 4, a wiring 6, a battery 8 (energization means), and an odometer 10 (travel distance measurement). Means), a timepiece 12 (operation time measuring means), a speedometer 14 (speed measuring means), and an ammeter 15 (resistance measuring means). The air purification device 1 is mounted on a vehicle. Further, the vehicle equipped with the air purification device 1 includes the electrolyte solution spraying means 16.

The catalyst 4 is made of, for example, a monolithic metal layer, and decomposes chemical substances in the atmosphere by coming into contact with the atmosphere. The catalyst 4 is made of a metal such as Ag (silver), Pt (platinum), Pd (palladium), Rh (rhodium), Cu (copper), Co (cobalt), Ni (nickel), or Mn (manganese). The catalyst 4 may be composed of one metal or a plurality of metals. As chemicals in the atmosphere in which the catalyst 4 is clean, for example, ozone, HC (hydrocarbons), there is a NO _x or the like. In the figure, the catalyst 4 is formed in a monolith shape, but may be formed in a pellet shape or a honeycomb shape, for example, and the shape is not limited.

  When the temperature of the catalyst 4 reaches the activation temperature, the purification function of the catalyst 4 is enhanced. When the temperature of the catalyst 4 is lower than the activation temperature, the purification function of the catalyst 4 is lowered. Further, the purification function also deteriorates when foreign matter is adsorbed on the catalyst 4 or when the catalyst 4 is oxidized.

  The battery 8 is electrically connected to the catalyst 4 via the wiring 6, and a current can flow through the catalyst 4. The wiring 6 is covered with a water-repellent resin. The odometer 10 measures the mileage of a vehicle equipped with an air purification device. The clock 12 measures the driving time of the vehicle. The speedometer 14 measures the speed (vehicle speed) of the vehicle. The ammeter 15 measures the current flowing through the catalyst 4 when the battery 8 is energized. Further, the electric resistance of the catalyst 4 can be measured from the current detected by the ammeter 15 and the voltage of the battery 8. The electrolyte solution spraying means 16 is, for example, a vehicle washer liquid spraying means. The air purification device 1 is preferably provided at a location where the washer fluid reaches the catalyst 4, for example, a radiator. That is, a vehicle washer fluid can be used as the electrolyte.

  The ECU 2 controls the energization by the battery 8 and also controls the spraying of the electrolyte solution by the electrolyte solution spraying means 16. Further, the ECU 2 acquires the travel distance from the odometer 10, the operation time from the clock 12, the speed from the speedometer 14, and the current from the ammeter 15. Next, the configuration of the air purification device 1 will be further described with reference to a functional block diagram.

  As shown in FIG. 1B, the ECU 2 functions as a temperature estimation unit 18, an energization control unit 20, and a purification function diagnosis unit 22. The temperature estimating means 18 estimates the temperature of the catalyst 4 based on the electric resistance of the catalyst 4. In Example 1, the electrical resistance of the catalyst 4 decreases as the temperature of the catalyst 4 increases. The energization control means 20 controls energization by the battery 8. The purification function diagnostic means 22 diagnoses the purification function of the catalyst 4. The catalyst 4 may be deteriorated depending on the usage time and usage environment, and the electric resistance may change from the start of use. When the catalyst 4 is deteriorated, the ECU 2 can estimate the temperature of the catalyst 4 from the electric resistance of the catalyst 4 according to the deterioration state of the catalyst 4. Details will be described later.

  Next, control performed by the air purification device 1 will be described. FIG. 2A and FIG. 2B are flowcharts illustrating the control of the air purification device according to the first embodiment.

  As shown in FIG. 2A, the energization control means 20 first determines whether energization by the battery 8 is possible (step S10). The control for determining whether or not energization is performed will be described with reference to FIG.

  As shown in FIG. 2B, the energization control means 20 determines whether the vehicle speed V of the vehicle measured by the speedometer 14 is greater than a predetermined speed V3 (third speed) (step S15). V3 is a speed predetermined as a threshold value. If no, the control repeats step S15. In the case of Yes, the energization control means 20 determines that energization by the battery 8 is possible (step S16). After step S16, the control for determining whether or not energization is completed. Returning to FIG. 2A, the control after step S10 will be described.

  As shown in FIG. 2A, after step S10, the energization control unit 20 determines whether or not the electric resistance R of the catalyst 4 is larger than a predetermined electric resistance R1 (step S11). If No, the control repeats step S11.

  In the case of Yes, the energization control means 20 turns on the energization of the catalyst 4 by the battery 8 (step S12). After step S12, the energization control means 20 determines whether or not the electrical resistance R is smaller than the predetermined electrical resistance R2 (step S13). R2 is an electric resistance smaller than R1. If no, control returns to step S12.

  In the case of Yes, the energization control means 20 turns off the energization by the battery 8 (step S14). After step S14, the control ends.

  According to the first embodiment, the battery 8 energizes the catalyst 4 when the electric resistance R of the catalyst 4 is larger than R1 (steps S11 and S12). By energizing the catalyst 4, the temperature of the catalyst 4 rises and the electric resistance R decreases. The temperature of the catalyst 4 increases so that the electric resistance R falls within the range from R2 to R1 (steps S13 and S14). The range from the electric resistance R2 to R1 corresponds to the range of the activation temperature of the catalyst 4. That is, when the temperature of the catalyst 4 is lower than the activation temperature, the energization control unit 20 performs control such that the battery 8 is energized so as to increase to the activation temperature. Thereby, the temperature of the catalyst 4 rises to the activation temperature, and the purification function of the catalyst 4 can be enhanced.

  Since the catalyst 4 is made of metal, the temperature can be estimated based on the electrical resistance to check whether the temperature of the catalyst 4 is the activation temperature (step S11 in FIG. 2A). Further, as described above, the temperature can be increased by energizing the catalyst 4. That is, grasping of the temperature of the catalyst 4 and improvement of the active function can be realized with a simple configuration. Thereby, cost reduction and size reduction of an air purification apparatus are attained.

  When the vehicle speed V is lower than V3, the energization control means 20 performs control so that the battery 8 is not energized (FIG. 2 (b)). Thereby, for example, when the air purification device is mounted on the radiator, the temperature of the radiator is prevented from rising due to energization. By suppressing the temperature rise of the radiator, it is possible to reduce the burden on the radiator, particularly during low-speed traveling. Moreover, it can suppress that the foreign material which infiltrated from the outside of a vehicle contacts the catalyst 4 or the wiring 6, and leaks.

  The wiring 6 is covered with a water-repellent resin. Since the resin suppresses the ingress of water, for example, malfunction of the air purification device due to a short circuit caused by rainwater or the like is suppressed. Further, since the catalyst 4 is purified by contact with the atmosphere, it is preferably not covered with a resin.

  The catalyst 4 purifies the atmosphere by contacting the atmosphere. For this reason, it is preferable to mount the air purification apparatus in a place that comes into contact with a large amount of air. For example, by mounting the air purification device 1 in front of the vehicle, it can come into contact with the traveling wind and can be efficiently purified. Specifically, it is a bumper or a radiator of a vehicle.

  The second embodiment is an example in which the air purification device performs self-diagnosis (OBD: On-board diagnostics) and recovery control. First, self-diagnosis will be described. FIG. 3 is a flowchart illustrating self-diagnosis control of the atmospheric control device according to the second embodiment. The configuration of the air purification device 1 has already been described with reference to FIGS. 1 (a) and 1 (b), and a description thereof will be omitted.

  As shown in FIG. 3, first, the ECU 2 determines whether the air purification device 1 is under recovery control (step S17). The recovery control will be described later. In the case of Yes, the purification function diagnostic means 22 determines whether or not the measured electric resistance R of the catalyst 4 is within a range from R3 to R4, which is a predetermined electric resistance (step S18).

  In the case of Yes in step S18, the purification function diagnosis means 22 diagnoses that the purification function of the air purification device is normal (step S19). After step S19, the control ends.

  In the case of No in step S18, the purification function diagnosis means 22 diagnoses that the purification function of the air purification device is abnormal (step S20). After step S20, the air purification device performs recovery control (step S21). After step S21, the control ends.

  In the case of No in step S17, the purification function diagnosis unit 22 determines whether the measured electric resistance R of the catalyst 4 is within a range from R5 to R6, which is a predetermined electric resistance (step S22). If Yes in step S22, control proceeds to step S19. If no, the control proceeds to step S20. Since the control after step S20 has already been described, a description thereof will be omitted. This completes the self-diagnosis control.

  As described above, when the electric resistance R of the catalyst 4 is not included in the range from R3 to R4 (step S18) or not included in the range from R5 to R6 (step S22), the purification function The diagnostic means 22 diagnoses that the purification function of the catalyst 4 is abnormal (step S20). The abnormality of the purification function is caused by, for example, the adsorbed components in the atmosphere adsorbed on the catalyst 4.

  Next, recovery control will be described. FIG. 4 is a flowchart illustrating recovery control of the atmospheric control device according to the second embodiment.

  As shown in FIG. 4, first, the energization control means 20 determines whether or not the vehicle travel distance L measured by the odometer 10 is greater than a predetermined distance L1 (step S23). L1 is a distance predetermined as a threshold value. If no, the control repeats step S23.

  In the case of Yes, the energization control means 20 determines whether energization by the battery 8 is possible (step S24). If no, control repeats step S24. In the case of Yes, the energization control means 20 determines whether the vehicle speed V measured by the speedometer 14 is greater than a predetermined speed V1 (first speed) (step S25). The speed V1 is larger than the speed V3 in FIG. 2B and is set in advance as a threshold value.

  If no, the control repeats step S25. In the case of Yes, the energization control means 20 determines whether or not the electric resistance R of the catalyst 4 is greater than a predetermined electric resistance R7 (step S26). If no, the control repeats step S26. In the case of Yes, the energization control means 20 turns on the energization by the battery 8 (step S27). The temperature of the catalyst 4 rises by energization. At this time, the temperature of the catalyst 4 rises to a temperature at which the poisoning component adsorbed on the catalyst 4 is desorbed and the purification function of the catalyst 4 is restored.

  After step S27, the energization control means 20 determines whether the electric resistance R is smaller than a predetermined electric resistance R8 (step S28). R8 has a larger electric resistance than R7. If no, the control returns to step S27. In the case of Yes, the energization control unit 20 determines whether the travel distance L of the vehicle is greater than a predetermined distance L2 (step S29). The distance L2 is larger than the distance L1. If no, the control returns to step S27. In the case of Yes, the energization control means 20 turns off the energization by the battery 8 (step S30). This completes the recovery control.

  According to the second embodiment, the purification function diagnosis unit 22 diagnoses the purification function of the catalyst 4 based on the resistance of the catalyst 4 (FIG. 3). Therefore, the air purification device can perform self-diagnosis on the purification function. For example, when the catalyst 4 is a catalyst having a low heat of reaction such as a room temperature catalyst, it is difficult to diagnose the purification function of the catalyst only by the temperature. In the second embodiment, the diagnosis is performed based on the electric resistance. Therefore, the diagnosis can be performed even when the reaction heat of the catalyst 4 is small.

  Further, according to the second embodiment, when the purification function is abnormal, the battery 8 is energized, whereby the temperature of the catalyst 4 rises to a predetermined temperature (step S27). Thereby, the poisoning component adhering to the catalyst 4 is desorbed, and the purification function is restored. In other words, according to the second embodiment, the battery 8 energizes the catalyst 4, thereby enabling the self-diagnosis of the purification function and the recovery of the purification function with a simple configuration. Further, as described in Example 1, the temperature of the catalyst 4 can be raised to the activation temperature. In order to desorb the poisoned component, it is preferable to raise the temperature of the catalyst 4 to a temperature higher than the activation temperature in step S27.

  The electric resistance of the catalyst 4 varies depending on the temperature. That is, the electrical resistance of the catalyst 4 detected by the air purification device varies depending on whether the recovery control is being performed or not. Therefore, in step S17 in FIG. 3, it is determined whether recovery control is being performed, and depending on the result, self-resistances having different electrical resistances as threshold values, such as R3 and R4 in step S18 and R5 and R6 in step S22, are used as the threshold values. It is preferable to make a diagnosis. Note that it is also possible to estimate the temperature of the catalyst 4 from the electric resistance of the catalyst 4 according to the deterioration state of the catalyst 4.

  Here, the relationship between the travel distance of the vehicle and the purification function with the catalyst 4 will be described with reference to the drawings. FIG. 5A and FIG. 5B are diagrams illustrating the relationship between the travel distance and the catalyst purification function. The horizontal axis represents the vehicle travel distance, and the vertical axis represents the catalyst purification efficiency.

  As shown in FIG. 5A, the purification efficiency of the catalyst 4 decreases as the travel distance increases. When the vehicle travels, the air purification device comes into contact with more air. For this reason, when the travel distance of the vehicle increases, more poisonous components in the atmosphere are adsorbed on the catalyst 4. As a result, the purification efficiency decreases as shown in FIG.

  As shown in FIG. 5 (b), in Example 2, the purification efficiency is recovered at every constant travel distance. According to the second embodiment, energization is performed when the travel distance L of the vehicle becomes the predetermined distance L1 (step S23). The energization control unit 20 continues energization until the travel distance L reaches the predetermined distance L2 (step S29). That is, after the vehicle has traveled a certain distance, the air purification device raises the temperature of the catalyst 4 and maintains the temperature raised state. As a result, as shown in FIG. 5B, poisoning components are desorbed from the catalyst 4 every time the vehicle travels a fixed distance, and the purification efficiency is restored.

  In addition to the travel distance, the travel time of the vehicle may be measured by the timepiece 12 and energized at regular intervals. Further, recovery control may be performed based on both the travel distance and the travel time.

  Next, the relationship between the vehicle speed and the purification function of the catalyst 4 will be described. FIG. 5C is a diagram illustrating the relationship between the vehicle speed and the ozone purification amount of the catalyst. The horizontal axis is the vehicle speed, and the vertical axis is the ozone purification amount.

  As shown in FIG. 5C, the ozone purification amount increases as the vehicle speed increases. This is because the catalyst comes into contact with more atmosphere at higher vehicle speeds. Further, for example, when the air purification device is mounted on the radiator, the radiator becomes hot when traveling at a high speed, and the temperature of the catalyst 4 increases accordingly. Therefore, the catalyst tends to reach the activation temperature.

  In the second embodiment, when the vehicle speed V is higher than the speed V1, the energization control unit 20 controls to energize (step S25). That is, energization in the recovery control is performed during high-speed traveling such as the area indicated by the dotted line in FIG. Since the temperature of the radiator and the like is higher during high speed travel than during low speed travel, the temperature of the catalyst 4 can be easily increased. Further, since the catalyst 4 whose purification function has been recovered comes into contact with a large amount of air by high speed traveling, the air can be purified more efficiently. The energization in the recovery control may be performed during low-speed traveling, but it is preferable during high-speed traveling in order to efficiently recover and purify the purification function as described above.

  In the second embodiment, the purification efficiency is recovered every certain traveling distance or traveling time, but the application example of the invention is not limited to this. That is, when the purification function diagnosis unit 22 diagnoses an abnormality, the recovery control may be performed regardless of the travel distance or travel time. Further, the recovery control may be performed without performing the self-diagnosis control, for example, every certain travel distance or travel time.

  In the third embodiment, as in the second embodiment, the air purification apparatus performs self-diagnosis and recovery control. FIG. 5 is a flowchart illustrating recovery control of the air purification device according to the third embodiment. The self-diagnosis control is the same as that shown in FIG.

  Steps S31 to S33 shown in FIG. 6 are the same controls as steps S23, S24 and S26 of FIG. After step S33, the vehicle speed V is measured by the speedometer 14. The energization control means 20 determines whether the vehicle speed V measured by the speedometer 14 is included in the range of the speed V3 to V2 (second speed) (step S34). The speed V2 is larger than V3 and is determined in advance as a threshold value. If no, the control repeats step S34.

  In the case of Yes, the ECU 2 determines whether or not the vehicle wiper is operating (step S35). In the case of Yes, that is, in case of rain, the control proceeds to step S37. In the case of No, the electrolyte solution spraying means 16 sprays the washer liquid (step S36). The catalyst 4 contacts the washer liquid sprayed by the electrolytic solution spraying means 16. After step S36, control proceeds to step S37.

  The energization control means 20 turns on the energization by the battery 8 (step S37). After step S37, control proceeds to step S38. Step S38, step S39, and step S40 are the same control as step S28, step S29, and step S30 of FIG. After step S40, the control ends.

  When the catalyst 4 is made of a metal, the oxide may adhere and the purification efficiency may decrease. According to the third embodiment, the catalyst 4 is energized in a state where the washer liquid is sprayed on the catalyst 4 or in a state where the catalyst 4 is wet with rain water due to rain. By energization, electrolysis is performed using washer liquid or rainwater as an electrolytic solution. By electrolysis, the oxide adhering to the catalyst 4 is reduced to become a metal. As a result, the oxide is removed, and the purification function of the catalyst 4 degraded by oxidation is restored.

  As shown in FIG. 5 (c), the ozone purification amount of the catalyst 4 is low during low-speed traveling. According to the third embodiment, the energization by the battery 8 is performed when the vehicle speed V is included in the range from V3 to V2 (step S34). That is, in a low speed state where the vehicle speed is in the range of V3 to V2, it is possible to travel at high speed after the purification function of the catalyst 4 is recovered. This makes it possible to efficiently purify when traveling at high speed. Note that energization may be performed during high-speed traveling. Further, energization may be performed when the vehicle speed V is lower than V3. However, as described above, it is preferable to energize at a vehicle speed higher than V3 in order to suppress the burden on the radiator and the like and to suppress leakage due to foreign matter from outside the vehicle.

  The electrolyte solution may be a liquid other than the washer liquid as long as it is a liquid for electrolysis. However, in order to simplify the configuration of the air purification device, reduce the cost, and reduce the size, it is preferable that the electrolytic solution is a washer liquid and the electrolytic solution spraying means 16 is a washer liquid spraying means. As in the second embodiment, in the third embodiment, when the purification function diagnostic unit 22 diagnoses an abnormality, the recovery control may be performed regardless of the travel distance or the travel time, or the self-diagnosis control is performed. Alternatively, recovery control may be performed. Further, the energization may be performed in accordance with the spraying of the washer liquid regardless of the travel distance, travel time, and self-diagnosis control.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

ECU 2
Catalyst 4
Wiring 6
Battery 8
Odometer 10
Clock 12
Speedometer 14
Ammeter 15
Electrolyte spraying means 16
Temperature estimation means 18
Energization control means 20
Purification function diagnosis means 22

Claims (9)

A catalyst made of metal and purifying chemicals in the atmosphere;
Energization means for energizing the catalyst;
Comprising a resistance measuring means for measuring the electrical resistance of the catalyst,
When the temperature of the catalyst estimated based on the electrical resistance measured by the resistance measuring unit is lower than the activation temperature of the catalyst, the energization unit energizes the catalyst so that the temperature of the catalyst rises to the activation temperature. An air purification apparatus characterized by performing.   2. The air purification device according to claim 1, further comprising a purification function diagnosing means for diagnosing the purification function of the catalyst based on the electrical resistance measured by the resistance measuring means. When the purification function diagnosis means diagnoses that the purification function of the catalyst is abnormal, the energization means performs energization to restore the purification function of the catalyst,
3. The air purification apparatus according to claim 2, wherein the energization for recovering the purification function of the catalyst is an energization for raising the temperature of the catalyst to a temperature at which the purification function of the catalyst is restored. . When the purification function diagnosis means diagnoses that the purification function of the catalyst is abnormal, the energization means performs energization to restore the purification function of the catalyst,
3. The air purification apparatus according to claim 2, wherein the energization for recovering the purification function of the catalyst is an energization that causes electrolysis of an oxide generated in the catalyst. A travel distance measuring means for measuring a travel distance of a vehicle on which the air purification device is mounted, or an operating time measuring means for measuring an operating time of an engine of the vehicle,
When the travel distance measured by the travel distance measurement means reaches a predetermined distance, or when the operation time measured by the operation time measurement means reaches a predetermined time, the energization means The air purification device according to any one of claims 1 to 3, wherein energization is performed so that the temperature is raised to a temperature at which the purification function of the catalyst is restored. Comprising speed measuring means for measuring the speed of a vehicle on which the air purification device is mounted;
The air purification apparatus according to claim 3 or 5, wherein when the speed measured by the speed measuring means is greater than the first speed, the energizing means energizes the catalyst so as to raise the temperature of the catalyst.   The atmosphere according to claim 4, wherein the energization means energizes so as to cause the electrolysis when in contact with a liquid for electrolyzing an oxide generated in the catalyst. Purification equipment.   The air purification device according to claim 7, wherein the electrolytic solution is rainwater or a washer liquid sprayed by a vehicle on which the air purification device is mounted. Comprising speed measuring means for measuring the speed of a vehicle on which the air purification device is mounted;
The air purification device according to any one of claims 4, 7, and 8, wherein the energization unit conducts energization when the speed measured by the speed measurement unit is smaller than a second speed.

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