JP2018149829A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of deodorizing air and capable of more reliably removing fine particles in the air.SOLUTION: The air conditioner for a vehicle has a first air conditioning pipe 10 for supplying an outside air taken in by a blower 34 to a passenger compartment, a second air conditioning pipe 20 branching from the first air conditioning pipe 10 at a branching portion 11 and joining a merging portion 12 on a downstream side of the branching portion 11, a first heat exchanger 21 which is provided in the second air conditioning pipe 20 and heats an air flowing through the second air conditioning pipe 20 with an exhaust heat of an exhaust gas flowing through an exhaust pipe 3 provided in an engine 2 as a heat source, an oxidation catalyst 23 provided on a downstream side of the first heat exchanger 21 of the second air conditioning pipe 20, a second heat exchanger 22 provided on an upstream side of the first heat exchanger 21 of the second air conditioning pipe 20, a filter 35, an exhaust gas sensor 36, a cooler 37 and a heater 38 provided on a downstream side of the merging portion 12 of the first air conditioning pipe 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle air conditioner capable of supplying clean air into a vehicle interior.

  2. Description of the Related Art Conventionally, a vehicle air conditioner that takes in outside air, removes particulates such as dust and pollen with a filter, and supplies the air to a passenger compartment is known. There is also known a vehicle air conditioner that deodorizes and sterilizes by heating outside air with a heat exchanger (see, for example, Patent Document 1).

  However, deodorization by the vehicle air conditioner having the above-described configuration is not sufficient, and there is a possibility that fine particles such as so-called PM2.5 cannot be removed sufficiently.

JP 2014-189077 A

  This invention is made | formed in view of such a situation, and it aims at providing the vehicle air conditioner which can deodorize air and can remove the microparticles | fine-particles in air more reliably.

  A first aspect of the present invention that solves the above problem is a vehicle air conditioner mounted on a vehicle equipped with an internal combustion engine, the first air conditioning pipe for supplying outside air taken in by a blower to a passenger compartment, The second air conditioning pipe branched from the first air conditioning pipe at a branching section and joined to the joining section downstream of the branching section, and the second air conditioning pipe are provided in the internal combustion engine. More than the first heat exchanger that heats the air flowing through the second air conditioning pipe using the exhaust heat of the exhaust gas flowing through the exhaust pipe as a heat source, and the first heat exchanger of the second air conditioning pipe And an oxidation catalyst provided on the downstream side.

  In the first aspect, air flowing from the first air-conditioning pipe to the passenger compartment is branched to the second air-conditioning pipe, particles such as pollen are purified by the first heat exchanger, fine particles are removed by the oxidation catalyst, and Deodorization can be performed. In particular, an oxidation catalyst generally operates at a high temperature, and requires a large amount of power because it needs to be heated with a heater. However, since the vehicle air conditioner of the present invention effectively uses the exhaust heat of the internal combustion engine as a heat source for increasing the temperature of the oxidation catalyst, it is possible to remove fine particles and deodorize without requiring a large amount of power. .

  According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the second air conditioning pipe has a second heat exchanger upstream of the first heat exchanger. The second heat exchanger is provided in a vehicle air conditioner that cools air after flowing through the oxidation catalyst with air supplied from the branch portion.

  In the second aspect, the first air conditioning pipe is provided with a second heat exchanger upstream of the first heat exchanger, and the air after flowing through the oxidation catalyst is cooled. Thereby, the air which distribute | circulated the oxidation catalyst can be cooled to the temperature suitable for the vehicle interior. Moreover, it cools with the air taken in from the branch part. That is, it is not necessary to prepare a separate cooling source for cooling the air that has flowed through the oxidation catalyst, and the configuration of the vehicle air conditioner can be prevented from becoming complicated.

  According to a third aspect of the present invention, in the vehicle air conditioner according to the first or second aspect, a filter is disposed downstream of the merging portion in the first air conditioning pipe. The vehicle air conditioner is characterized.

  In the third aspect, the first air conditioning pipe is provided with a filter on the downstream side of the junction. The fine particles in the air are removed by circulating the second air conditioning pipe. Therefore, since the fine particles captured by the filter are reduced, the frequency of replacing or cleaning the filter can be reduced.

  According to a fourth aspect of the present invention, in the vehicle air conditioner according to any one of the first to third aspects, the temperature of the air flowing through the first air conditioning pipe is set in the first air conditioning pipe. The vehicle air conditioner is provided with a cooler or a heater to be adjusted.

  In the fourth aspect, the first air conditioning pipe is provided with a cooler or a heater. Thereby, temperature adjustment of a vehicle interior can be performed with clear air.

  According to a fifth aspect of the present invention, in the vehicle air conditioner according to the fourth aspect, after the cooler stops, the cooler is dried from air heated through the second air conditioning pipe. It is in the vehicle air conditioner characterized by making it.

  In the fifth aspect, generation of mold or the like in the cooler can be suppressed, and clean air that does not have an unpleasant odor when the air-conditioning operation is started can be supplied to the passenger compartment.

  According to a sixth aspect of the present invention, in the vehicle air conditioner according to any one of the first to fifth aspects, the first air conditioning pipe is provided with an exhaust gas sensor on the downstream side of the junction. It is in the vehicle air conditioner characterized by the above-mentioned.

  In the sixth aspect, exhaust gas in the air can be detected.

  According to a seventh aspect of the present invention, in the vehicle air conditioner according to the sixth aspect, the first air conditioning pipe is branched upstream from the passenger compartment and communicated to the outside of the vehicle, and the passenger compartment. Or a valve for switching to one of the branch pipes, and when the exhaust gas sensor detects an exhaust gas component in the air when air is circulated through the second air conditioning pipe, the air is supplied to the branch pipe. A vehicle air conditioner comprising a control device for switching the valve so as to be discharged out of the vehicle.

  In the seventh aspect, when the exhaust air is detected in the air while the air is heated and purified by the second air conditioning pipe, the air is discharged out of the vehicle via the branch pipe. Thereby, even if exhaust gas leaks into the 2nd air conditioning piping, it can avoid flowing into a compartment.

  According to an eighth aspect of the present invention, in the vehicle air conditioner according to the sixth or seventh aspect, air is circulated through the first air conditioning pipe, and air is circulated through the second air conditioning pipe. When the exhaust gas sensor detects the exhaust gas component in the air when the exhaust gas sensor is not present, the vehicle air conditioner introduces air in the vehicle compartment to the first air conditioning pipe.

  In the eighth aspect, when air is not circulated through the second air conditioning pipe, when exhaust gas is detected in the air, the air in the passenger compartment is switched to the inside air circulation, which is introduced into the first air conditioning pipe. Thereby, when the exhaust gas discharged | emitted from the front vehicle flows in into a compartment, the air of a compartment can be purified.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle air conditioner which can deodorize air and can remove the microparticles | fine-particles in air more reliably is provided.

It is a schematic block diagram of the vehicle air conditioner in a normal air-conditioner mode. It is a schematic block diagram of the vehicle air conditioner in an air purifying mode. It is a schematic block diagram of the vehicle air conditioner in a cooler drying mode.

Hereinafter, modes for carrying out the present invention will be described. In addition, description of embodiment is an illustration and this invention is not limited to the following description.
<Embodiment 1>
FIG. 1 is a schematic configuration diagram of a vehicle air conditioner. The vehicle air conditioner 1 according to the present embodiment is mounted on a vehicle including an engine 2 (internal combustion engine). The vehicle engine 2 is provided with an exhaust pipe 3 for discharging exhaust gas to the outside, and the exhaust pipe 3 is provided with a three-way catalyst 4 for removing NOx and the like in the exhaust gas.

  The vehicle air conditioner 1 includes a first air conditioning pipe 10 for supplying outside air to the passenger compartment. The first air conditioning pipe 10 is provided with a blower 34 on one end side, and the other end side communicates with the passenger compartment. Outside air is taken into the first air conditioning pipe 10 by the blower 34. In the present embodiment, the blower 34 can also take in the air in the passenger compartment via a pipe (not shown), a valve provided in the pipe, and the like.

The first air conditioning pipe 10 is provided with a branch portion 11 and a junction portion 12 on the downstream side of the branch portion 11. The first air conditioning pipe 10 is connected to a second air conditioning pipe 20 that branches off at the branching section 11 and joins the joining section 12. Further, the first air conditioning pipe 10 is connected to a branch pipe 14 that branches upstream from the passenger compartment and communicates with the outside of the vehicle. A portion where the first air conditioning pipe 10 and the branch pipe 14 branch is referred to as a switching unit 13.
A first switching valve 31, a second switching valve 32, and a third switching valve 33 are provided in each of the branching unit 11, the merging unit 12, and the switching unit 13, respectively.

  The first switching valve 31 has a path through which air introduced from the blower 34 flows as it is downstream of the first air conditioning pipe 10 and a path through which the air flows from the branching section 11 to the second air conditioning pipe 20. And a valve for switching to one of the paths.

  The second switching valve 32 has a path through which the air introduced from the blower 34 flows as it is downstream of the first air conditioning pipe 10 and the air that has passed through the second air conditioning pipe 20 from the junction 12 to the first. This is a valve for switching to any one of the routes to be circulated to the air conditioning pipe 10.

  The third switching valve 33 is a valve that switches to one of a path for flowing air from the first air conditioning pipe 10 to the passenger compartment and a path for flowing air from the switching unit 13 to the branch pipe 14. .

Further, the first air conditioning pipe 10 is provided with a filter 35, an exhaust gas sensor 36, a cooler 37 and a heater 38.
The filter 35 filters the air flowing through the first air conditioning pipe 10. The filter 35 is provided on the downstream side of the merging portion 12 in the first air conditioning pipe 10 and on the upstream side of the exhaust gas sensor 36, the cooler 37, and the heater 38.

  The exhaust gas sensor 36 is a device that detects exhaust gas components contained in the air flowing through the first air conditioning pipe 10. The exhaust gas sensor 36 is provided downstream of the filter 35 in the first air conditioning pipe 10 and upstream of the cooler 37 and the heater 38. Examples of the exhaust gas component include NOx components and fine particles peculiar to the exhaust gas. As the exhaust gas sensor 36, a Nox sensor for detecting the NOx concentration, a sensor for detecting the amount of fine particles, or the like can be used.

  The cooler 37 and the heater 38 are devices that cool or heat air used in a general vehicle air conditioner, and the device configuration is not particularly limited. The cooler 37 and the heater 38 are provided on the downstream side of the exhaust gas sensor 36 and on the upstream side of the passenger compartment in the first air conditioning pipe 10. For example, an evaporator can be used as the cooler 37. As the heater 38, a heater using the cooling water of the engine 2 as a heat source can be used.

The second air conditioning pipe 20 is provided with a first heat exchanger 21, a second heat exchanger 22, and an oxidation catalyst 23.
The first heat exchanger 21 is a device that heats the air flowing through the second air conditioning pipe 20 using the exhaust heat of the exhaust gas flowing through the exhaust pipe 3 as a heat source. In this embodiment, the 1st heat exchanger 21 is comprised by arrange | positioning a part of 2nd air conditioning piping 20 inside the exhaust pipe 3 so that it may become concentric.

  In the first heat exchanger 21 having such a configuration, the air in the second air conditioning pipe 20 is indirectly heated by the heat of the exhaust gas inside the exhaust pipe 3. The temperature of the air at the outlet of the first heat exchanger 21, that is, the portion of the second air conditioning pipe 20 that has exited from the exhaust pipe 3 to the outside is preferably a temperature suitable for the oxidation catalyst 23.

  The second heat exchanger 22 is a device that cools the air heated by the first heat exchanger 21 with the air supplied from the branching section 11. Of the second air conditioning pipe 20, a portion from the branching section 11 to the first heat exchanger 21 is referred to as an upstream air conditioning pipe 25, and a section from the oxidation catalyst 23 to the joining section 12 is referred to as a downstream air conditioning pipe 26. In this embodiment, the 2nd heat exchanger 22 is comprised by arrange | positioning a part of downstream air conditioning piping 26 so that it may become concentric inside the upstream air conditioning piping 25. As shown in FIG.

  In the second heat exchanger 22 having such a configuration, the air in the downstream air conditioning pipe 26 is indirectly cooled by the air from the branching section 11 inside the upstream air conditioning pipe 25. The temperature of the air at the outlet of the second heat exchanger 22, that is, the portion of the downstream side air conditioning pipe 26 that exits from the upstream side air conditioning pipe 25 to the outside is the filter 35, the exhaust gas sensor 36, the cooler 37, and the heater 38. It is preferable to set the temperature suitable for the temperature.

  The oxidation catalyst 23 is a catalyst provided downstream of the first heat exchanger 21. The oxidation catalyst 23 is made of a known material, adsorbs particulates such as PM2.5 contained in the air, and adsorbs substances that cause odors. In order for the oxidation catalyst 23 to exhibit the adsorption function and the deodorization function of the fine particles and the like, it needs to be placed at a high temperature of, for example, 200 ° C. or higher. In the present embodiment, the air supplied to the oxidation catalyst 23 is heated by the first heat exchanger 21. Since the degree of heating is set to the above appropriate temperature, the adsorption function and the deodorizing function by the oxidation catalyst 23 can be exhibited well.

  The vehicle air conditioner 1 includes a control device 40. The control device 40 is configured by a microcomputer including a central processing unit and a main storage device, and operates various devices such as switching the vehicle engine 2 and the first switching valve 31 to the third switching valve 33. It is a device to control.

In the vehicle air conditioner 1 having the above-described configuration, an operation (normal air conditioner mode) when performing normal air blowing, cooling, or heating will be described.
The control device 40 activates the blower 34, the cooler 37, or the heater 38 according to the operation content when the user operates the vehicle air conditioner 1 to blow, cool, or heat the vehicle. .

  In the normal air conditioner mode, the control device 40 causes the blower 34 to introduce outside air when introducing outside air. Moreover, the control apparatus 40 switches the 1st switching valve 31 and the 2nd switching valve 32 so that air distribute | circulates from the branch part 11 to the 1st air conditioning piping 10. FIG. In other words, the first switching valve 31 and the second switching valve 32 are switched so as to shut off the second air conditioning pipe 20 from the first air conditioning pipe 10. As a result, air flows from the blower 34 to the downstream filter 35 and the like. Furthermore, the control device 40 switches the third switching valve 33 so that air flows from the first air conditioning pipe 10 to the passenger compartment. Thereby, the air whose temperature has been adjusted by the cooler 37 or the heater 38 is supplied to the passenger compartment.

  In such a normal air conditioner mode, for example, exhaust gas discharged by the vehicle ahead may enter from the blower 34. Such exhaust gas is detected by the exhaust gas sensor 36. The detection of the exhaust gas by the exhaust gas sensor 36 is transmitted to the control device 40. And the control apparatus 40 introduces the air in a vehicle interior to the 1st air conditioning piping 10 via the blower 34, when exhaust gas is detected. That is, the control device 40 switches to so-called inside air circulation. Thus, the exhaust gas is reduced by the filter 35, and the purified air can be supplied to the vehicle compartment.

Next, with reference to FIG. 2, an operation (air cleaning mode) for purifying air in the vehicle air conditioner 1 having the above configuration will be described.
The control device 40 shifts to the air cleaning mode on condition that the exhaust temperature of the engine 2 has reached a predetermined temperature. Of course, other conditions may be added. For example, a condition that the user gives an instruction to shift to the air cleaning mode to the control device 40 may be added.

  The method for detecting the exhaust temperature of the exhaust gas from the engine 2 is not particularly limited. For example, there is a method for detecting the exhaust temperature by acquiring the coolant temperature of the engine 2 with a temperature sensor and estimating the exhaust temperature from the coolant temperature. It is done.

  Here, the temperature of the air supplied from the first heat exchanger 21 to the oxidation catalyst 23 is preferably close to an appropriate temperature because the oxidation catalyst 23 exhibits a fine particle removing function and a deodorizing function well. Therefore, it is preferable that the exhaust temperature of the exhaust gas is a temperature necessary for setting the temperature of the air near the outlet of the first heat exchanger 21 to the appropriate temperature (this is the predetermined temperature). Such a predetermined temperature depends on the heat transfer area of the first heat exchanger 21, the flow rate of the exhaust gas, the flow rate or temperature of the air flowing from the second heat exchanger 22 to the first heat exchanger 21, and the like. Etc. can be determined based on the above.

  When the control device 40 determines that the exhaust temperature estimated from the cooling water temperature is a predetermined temperature, the control device 40 shifts to the air cleaning mode. In the air cleaning mode, the control device 40 operates the blower 34 to introduce outside air into the first air conditioning pipe 10. Note that the air cleaning mode can be applied to either outside air introduction or inside air circulation.

  Next, the control device 40 causes the first switching valve 31 and the second switching device 31 so that air flows from the branching section 11 to the second air conditioning pipe 20 and air flows from the second air conditioning pipe 20 to the joining section 12. The switching valve 32 is switched. As a result, air is introduced from the blower 34 to the first air conditioning pipe 10 and is further introduced from the branch portion 11 to the second air conditioning pipe 20.

  In the second air conditioning pipe 20, the air is heated by the first heat exchanger 21. By this heating, pollen, mold, virus, etc. contained in the air are rendered harmless, and clean air is obtained. Further, air is adsorbed and removed by particulates such as PM2.5 and substances that cause odors by the oxidation catalyst 23. In this way, air can be circulated to the second air conditioning pipe 20 to remove pollen, mold, virus, fine particles, and the like, thereby obtaining deodorized clean air.

The air flowing through the second air conditioning pipe 20 is filtered by the filter 35 and further purified. The air is sent to the cooler 37 during the cooling operation and sent to the heater 38 during the heating operation, and the temperature is adjusted.
In addition, the control device 40 switches the third switching valve 33 so that air is supplied from the first air conditioning pipe 10 to the passenger compartment. As a result, clean and temperature-controlled air is supplied to the passenger compartment.

  Here, the control when the exhaust gas is mixed into the second air conditioning pipe 20 in the first heat exchanger 21 will be described. In this case, the control device 40 is notified from the exhaust gas sensor 36 that exhaust gas has been detected in the air. The control device 40 stops the blower 34 and further switches the third switching valve 33 so as to go from the first air conditioning pipe 10 to the branch pipe 14.

  By such control, the air containing the exhaust gas is discharged from the branch pipe 14 to the outside of the vehicle, so that the exhaust gas can be prevented from flowing into the vehicle interior. In other words, it is possible to supply clean air to the passenger compartment after confirming by the exhaust gas sensor 36 that the first air conditioning pipe 10 does not contain exhaust gas.

Next, the operation (cooler drying mode) when the cooler 37 is dried in the vehicle air conditioner 1 having the above configuration will be described with reference to FIG.
The control device 40 causes the air to flow from the branching unit 11 to the second air conditioning pipe 20 and the air to flow from the second air conditioning pipe 20 to the merging unit 12 after the cooling operation is stopped by a user operation. The first switching valve 31 and the second switching valve 32 are switched to each other. That is, the first switching valve 31 and the second switching valve 32 are switched as in the air cleaning mode. Furthermore, the control device 40 switches the third switching valve 33 so that air is discharged from the first air conditioning pipe 10 to the outside of the vehicle. Further, the control device 40 introduces outside air into the blower 34.

  By such control, the air introduced into the first air conditioning pipe 10 is heated and purified by the first heat exchanger 21 and the oxidation catalyst 23 via the second air conditioning pipe 20. Then, since the heated and purified air is supplied to the cooler 37, the cooler 37 is dried.

  In the conventional vehicle air conditioner 1, condensation occurs in the cooler 37 after the cooling operation is stopped. If this condensation is left unattended, mold may be generated, which causes an unpleasant odor. However, in the vehicle air conditioner 1 of the present embodiment, the cooler 37 is dried with heated and purified air, so that condensation can be suppressed and generation of mold can be suppressed. Thereby, when the air-conditioning operation is started, the temperature in the passenger compartment can be adjusted with clean air without an unpleasant odor caused by mold or the like.

  In the vehicle air conditioner 1 of the present embodiment described above, the air flowing from the first air conditioning pipe 10 to the passenger compartment is branched to the second air conditioning pipe 20, and pollen or the like is made by the first heat exchanger 21. The particles can be purified, and fine particles can be removed and deodorized by the oxidation catalyst 23. In particular, the oxidation catalyst 23 generally operates at a high temperature, and requires a large amount of power because it needs to be heated by a heater. However, since the vehicle air conditioner 1 according to the present embodiment effectively uses the exhaust heat of the engine 2 as a heat source for increasing the temperature of the oxidation catalyst 23, the removal of the fine particles and the deodorization can be realized without requiring high power. be able to.

  In the vehicle air conditioner 1 of the present embodiment, the air after the second air exchanger 22 is provided upstream of the first heat exchanger 21 in the first air conditioning pipe 10 and the oxidation catalyst 23 is circulated. Cool down. Thereby, the air which distribute | circulated the oxidation catalyst 23 can be cooled to the temperature suitable for the vehicle interior. Moreover, it cools with the air taken in from the branch part 11. FIG. That is, it is not necessary to prepare a separate cooling source for cooling the air that has passed through the oxidation catalyst 23, and it is possible to avoid complication of the configuration of the vehicle air conditioner 1.

  In the vehicle air conditioner 1 of the present embodiment, the first air conditioning pipe 10 is provided with a filter 35 on the downstream side of the junction 12. By circulating the second air conditioning pipe 20, fine particles in the air are removed. Accordingly, since the particulates captured by the filter 35 are reduced, the frequency of replacing or cleaning the filter 35 can be reduced.

  In the vehicle air conditioner 1 of this embodiment, the first air conditioning pipe 10 is provided with a cooler 37 or a heater 38. Thereby, temperature adjustment of a vehicle interior can be performed with clear air.

  In the vehicle air conditioner 1 of the present embodiment, after the cooling operation is stopped, that is, after the cooler 37 is stopped, the cooler 37 is dried (see FIG. 3 and the like). Thereby, generation | occurrence | production of mold | fungi in the cooler 37 can be suppressed and clean air without an unpleasant odor when the air-conditioning operation is started can be supplied to the passenger compartment.

  In the vehicle air conditioner 1 of the present embodiment, the first air conditioning pipe 10 is provided with an exhaust gas sensor 36 on the downstream side of the junction 12. Thereby, the exhaust gas in the air can be detected.

  In the vehicle air conditioner 1 of this embodiment, when exhaust gas is detected in the air while the air is heated and purified by the second air conditioning pipe 20, the air is discharged out of the vehicle via the branch pipe 14. . As a result, even if exhaust gas leaks from the exhaust pipe 3 of the engine 2 to the second air conditioning pipe 20, it can be prevented from flowing into the passenger compartment.

  In the vehicle air conditioner 1 of the present embodiment, when exhaust gas is detected in the air when air is not circulated through the second air conditioning pipe 20, the air in the vehicle compartment is introduced into the first air conditioning pipe 10. , Switch to inside air circulation. Thereby, when the exhaust gas discharged | emitted from the front vehicle flows in into a compartment, the air of a compartment can be purified.

<Other embodiments>
As mentioned above, although one embodiment of the present invention has been described, of course, the present invention is not limited to the above-described embodiment, and addition, omission, replacement, etc., of a configuration is possible without departing from the spirit of the present invention. And other changes are possible.

  In the first embodiment, the first heat exchanger 21 is provided on the upstream side of the three-way catalyst 4 of the exhaust pipe 3, but is not limited to such an attachment position. As long as the air of the 2nd air conditioning piping 20 can be heated to the temperature mentioned above, the downstream of the three-way catalyst 4 may be sufficient. The first heat exchanger 21 has a configuration in which a part of the first heat exchanger 21 is concentrically arranged in the exhaust pipe 3, but is not limited to such a configuration. What is necessary is just the structure which can heat the air of the 2nd air conditioning piping 20 with the heat | fever of the exhaust pipe 3. FIG.

  Although the 2nd heat exchanger 22 is the structure by which a part of downstream air conditioning piping 26 was arrange | positioned in the upstream air conditioning piping 25, it is not limited to this. What is necessary is just the structure which can cool the air of the downstream air conditioning piping 26 with the air from the branch part 11. FIG. Furthermore, although the air flowing in from the branch part 11 was used as a cooling source, it is not limited to this, Arbitrary cooling sources can be used.

DESCRIPTION OF SYMBOLS 1 ... Vehicle air conditioner, 2 ... Engine (internal combustion engine), 3 ... Exhaust pipe, 4 ... Three-way catalyst, 10 ... 1st air conditioning piping, 11 ... Branch part, 12 ... Merging part, 13 ... Switching part, 14 ... branch pipe, 20 ... second air conditioning pipe, 21 ... first heat exchanger, 22 ... second heat exchanger, 23 ... oxidation catalyst, 25 ... upstream air conditioning pipe, 26 ... downstream air conditioning pipe, 31 ... 1st switching valve, 32 ... 2nd switching valve, 33 ... 3rd switching valve, 34 ... Blower, 35 ... Filter, 36 ... Exhaust gas sensor, 37 ... Cooler, 38 ... Heater, 40 ... Control device

Claims (8)

A vehicle air conditioner mounted on a vehicle equipped with an internal combustion engine,
A first air conditioning pipe for supplying outside air taken in by the blower to the passenger compartment;
A second air conditioning pipe that branches off from the first air conditioning pipe at a branching section and joins a joining section on the downstream side of the branching section;
A first heat exchanger which is provided in the second air conditioning pipe and heats the air flowing through the second air conditioning pipe by using exhaust heat of exhaust gas flowing through the exhaust pipe provided in the internal combustion engine as a heat source; ,
And an oxidation catalyst provided on a downstream side of the first heat exchanger of the second air conditioning pipe. In the vehicle air conditioner according to claim 1,
The second air conditioning pipe is provided with a second heat exchanger upstream of the first heat exchanger,
The air conditioner for a vehicle, wherein the second heat exchanger cools air after flowing through the oxidation catalyst with air supplied from the branch portion. In the vehicle air conditioner according to claim 1 or 2,
The vehicle air conditioner, wherein the first air conditioning pipe is provided with a filter on the downstream side of the junction. In the vehicle air conditioner according to any one of claims 1 to 3,
The first air-conditioning pipe is provided with a cooler or a heater that adjusts the temperature of air flowing through the first air-conditioning pipe. The vehicle air conditioner according to claim 4,
After the said cooler stops, the said cooler is dried from the air which distribute | circulated the said 2nd air conditioning piping and was heated. The vehicle air conditioner characterized by the above-mentioned. The vehicle air conditioner according to any one of claims 1 to 5,
The vehicle air conditioner is characterized in that an exhaust gas sensor is provided on the first air conditioning pipe on the downstream side of the junction. The vehicle air conditioner according to claim 6,
The first air conditioning pipe includes a branch pipe branched upstream from the passenger compartment and communicated to the outside of the vehicle, and a valve that switches to either the passenger compartment or the branch pipe.
A control device for switching the valve so that air is discharged from the branch pipe to the outside of the vehicle when an exhaust gas component in the air is detected by the exhaust gas sensor when air is circulated through the second air conditioning pipe; A vehicle air conditioner comprising: The vehicle air conditioner according to claim 6 or 7,
When air is circulated through the first air conditioning pipe and air is not circulated through the second air conditioning pipe, when exhaust gas components in the air are detected by the exhaust gas sensor, The vehicle air conditioner is introduced into the first air conditioning pipe.

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