JP2007309213A - Oxygen enriching device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen enriching device of a good mounting property improving engine torque by accurately controlling oxygen concentration of intake air mixed in an engine intake passage by a simple method without using a tank for storing oxygen in oxygen enriching device supplying air of high oxygen concentration to the engine intake air passage. <P>SOLUTION: In the oxygen enriching device 10 provided in parallel with the engine intake air passage 51, oxygen enriched air formed by a zeolite separation film 1 is stored to or discharged from an oxygen storage part 3 composed of an oxygen adsorption part 6 and a heat exchanger 7 based on an operation condition and data of oxygen concentration of mixed intake air detected by an O2 sensor 5, and opening of an oxygen supply valve 4 is controlled by ECU 8 to mix with normal air in an intake air path 51 to form mixed intake air. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oxygen enrichment device that supplies air with an increased oxygen concentration to the air in an engine intake passage in order to increase combustion efficiency by supplying air with a high oxygen concentration to an internal combustion engine, and control thereof.

The gasoline engine of the vehicle is said to be unable to obtain an acceleration feeling when the accelerator is depressed because the low-speed torque is insufficient compared to the diesel engine.
The reason why the low-speed torque is insufficient in a gasoline engine is that the thermal efficiency of the engine does not increase because the amount of oxygen introduced into the engine cylinder at low speed is small. Therefore, an oxygen enricher is used to increase the amount of oxygen introduced.
Conventionally, as a technique using an oxygen enrichment apparatus in an internal combustion engine, for example, there is Patent Document 1. This is because oxygen / nitrogen separation type adsorbent (zeolite, etc.) is used to extract high oxygen concentration air from the air, which is stored in a tank, and the high concentration oxygen is removed from the engine via a valve linked to the controller. This is a method of increasing the amount of oxygen introduced into the engine by supplying it to the air intake passage. A method of accumulating high-concentration oxygen in a tank and directly injecting it from a gas injection valve into a combustion chamber of an engine is also disclosed (for example, Patent Document 2).
JP 2002-155770 A JP 2001-182573 A

  However, in the conventional high-concentration oxygen supply system, not only is it difficult to supply air with a constant oxygen concentration, but in order to supply a large amount of high-concentration oxygen, a very large tank is required, There are problems such as mountability due to volume increase and fuel consumption deterioration due to weight increase.

  The present invention has been made in view of the above circumstances, and in an oxygen enrichment device that supplies high-concentration oxygen to the engine intake passage, the amount of high-concentration oxygen supplied to the intake passage and the oxygen concentration are controlled to supply the engine. To provide an oxygen enrichment device that can easily and accurately control the oxygen concentration of mixed oxygen-enriched air to improve engine torque, and that does not use a tank for storing oxygen. With the goal.

The oxygen enrichment apparatus according to claim 1 for solving the above-described problem includes a pressure difference generation unit that generates a pressure difference between both the front chamber and the rear chamber via the separation membrane, and the front chamber Normal oxygen is introduced into the rear chamber, oxygen or nitrogen is permeated into the rear chamber, oxygen is separated from the normal air, oxygen storage unit that stores oxygen-enriched air separated by the oxygen separation unit, A control device that adjusts a mixing amount of oxygen-enriched air stored in the oxygen storage unit with respect to normal air flowing through the engine intake passage, wherein the oxygen storage unit includes the separated oxygen-enriched device. It is characterized by comprising an oxygen adsorbing part that stores the oxidant air by reducing the volume for storing the oxidant air and increasing the amount of oxygen-enriched air per predetermined volume.
In the present invention, normal air (intake) before oxygen enrichment is referred to as normal air, and oxygen-enriched air in the oxygen separator is referred to as oxygen-enriched air. The mixed air is called mixed intake air to distinguish the three.

  In the oxygen enrichment device of the first aspect of the invention, the control device can control the oxygen concentration of the mixed intake air in the intake passage supplied to the engine by adjusting the amount of oxygen-enriched air mixed into the normal air in the intake passage. . Therefore, the oxygen concentration itself of the mixed intake air supplied to the engine can be accurately controlled in accordance with the operating condition of the engine. In addition, when there is no need to increase the oxygen concentration of the intake air supplied to the engine depending on the operating conditions, the oxygen storage unit can be dedicated to storing oxygen. Furthermore, since the oxygen storage unit is constituted by an oxygen adsorption unit instead of a conventional tank, the space and weight for storing oxygen-rich air can be greatly reduced, and the mountability can be remarkably improved.

  According to a second aspect of the present invention, there is provided the oxygen enrichment apparatus according to the first aspect, wherein the oxygen adsorbing unit is configured to lower the temperature of the oxygen adsorbing unit and store oxygen in the oxygen adsorbing unit, and the temperature of the oxygen adsorbing unit. And a temperature raising means for releasing oxygen from the oxygen adsorbing portion.

According to a third aspect of the present invention, in the oxygen enrichment apparatus according to the second aspect, the apparatus is provided with a temperature lowering means that is performed by supplying a refrigerant for an air conditioner to the heat exchanger.
In the invention of claim 4, the heating of the oxygen adsorbing section may be performed by supplying warm water for heater to the heat exchanger as a temperature raising means.
According to a fifth aspect of the present invention, in the oxygen enrichment apparatus according to the third to fourth aspects, the supply amount of the air conditioner refrigerant and the warm water for the heater to the heat exchanger is adjusted, And an adjustment unit for adjusting the discharge amount.

  According to the structure of Claims 2-5, since oxygen is discharge | released by heating an oxygen adsorption part, and oxygen storage is performed by cooling, heat sources, such as a vehicle-mounted warm water for heaters, and a refrigerant | coolant for air conditioners, are utilized. be able to. Therefore, in addition to the above effect (the effect of the invention of claim 1), a new device is not required and the cost increase can be suppressed.

According to a sixth aspect of the present invention, in the oxygen enrichment apparatus of the first aspect, the separation membrane of the oxygen separation section is constituted by a zeolite separation membrane.
By using a zeolite permeable membrane that selectively permeates only oxygen (or nitrogen) depending on the pressure difference, it is possible to easily generate oxygen-enriched air from the air taken from the outside air by decompression or pressurization. It is possible to make the system simpler than that of an oxygen separator using the above.

According to a seventh aspect of the present invention, in the oxygen enrichment device according to the first to sixth aspects, the control device is configured to control the heating amount and the cooling amount of the oxygen adsorbing portion based on the driving state of the vehicle for heating and cooling. Yes.
According to the structure of claim 7, when the engine does not require oxygen-enriched air, oxygen is stored, and oxygen is released only when the engine is in an operating condition requiring oxygen-enriched air, thereby efficiently The enrichment device can be controlled.

According to an eighth aspect of the present invention, in the oxygen enrichment device according to any one of the first to sixth aspects, the control device mixes the operating state of the vehicle and the mixed intake air in the engine intake passage (normal air and oxygen enriched air in the oxygen storage section). The oxygen concentration of the oxygen-enriched air supplied to the engine is controlled by controlling the heating amount of the oxygen adsorbing part and the opening of the oxygen supply valve based on the information from the O2 sensor that detects the oxygen concentration of It is the composition to do.
According to this configuration, the oxygen enricher can accurately supply air (intake air) having an oxygen concentration according to the driving situation to the engine, so that the vehicle driver can easily provide the necessary torque according to the driving situation. Can get to.

According to a ninth aspect of the present invention, in the oxygen enrichment apparatus according to the first to eighth aspects, the oxygen adsorbing portion may be configured using copper calcinate.
Copper calcinate has a characteristic that a large amount of oxygen molecules are adsorbed on its surface by cooling or pressurizing and easily released by heating. Therefore, by using an oxygen adsorbing portion made of copper calcinate instead of the conventional oxygen storage tank, it is possible to significantly reduce both weight and capacity. Further, since the occlusion and release of oxygen can be controlled by cooling and heating, the configuration and operation of the oxygen adsorbing portion are easy.

As described above, the oxygen enrichment device for an internal combustion engine according to the present invention first detects the oxygen concentration of the air supplied to the engine by the O2 sensor, and controls the oxygen adsorption unit, the oxygen supply valve, and the throttle valve. Thus, since the oxygen concentration can be accurately controlled, air having an oxygen concentration corresponding to the driving situation can be supplied to the engine, and the thermal efficiency of the engine can be improved to obtain the necessary torque.
Secondly, oxygen molecules can be further released from the oxygen adsorbing unit to the oxygen-enriched air generated in the oxygen separation unit, so that the oxygen concentration is higher than that of the conventional oxygen-enriched air. This has the effect of shortening the time to reach the target oxygen concentration when increasing the oxygen concentration of the air supplied to the engine.
Third, instead of a tank for storing high oxygen concentration air, oxygen is stored in the adsorbent material, so that the weight is reduced and the capacity is reduced, and the oxygen enrichment apparatus has good mountability.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 is an overall configuration diagram showing an oxygen enrichment apparatus 10 according to Embodiment 1 of the present invention and an engine intake passage and a control system related to the oxygen enrichment apparatus 10.
As shown in FIG. 1, the oxygen enrichment device 10 includes an oxygen separation unit 1, a pressure generation unit 2, an oxygen storage unit 3, an oxygen supply valve 4, an O2 sensor 5, and an ECU 8 as a control device. The pressure generator 2 includes a decompression pump 2a, a power source 2c for driving the decompression pump 2a, and a pressure channel 2b that connects the decompression pump 2a and the oxygen separation unit 1.
The oxygen storage unit 3 includes an oxygen adsorption unit 6 and a heat exchanger 7. Further, an ECU 8 is connected to the oxygen storage unit 3, the oxygen supply valve 4 and the O 2 sensor 5 in order to control the oxygen enrichment device 10.
A branch path 9 for introducing normal air branched from the engine intake path 51 to the oxygen separation section 1 is connected to the upstream side of the engine intake path 51. Is provided with a mixed layer 54 for mixing the oxygen-enriched air from the oxygen enricher 10 with normal air and sending it to the downstream engine 50 as oxygen-enriched mixed intake air. An air cleaner 52 that removes atmospheric dust and the like is provided at the air inlet of the engine intake passage 51, and a throttle valve 53 is provided at the inlet side of the mixed layer 54 provided in the engine intake passage 51. The throttle valve 53 is controlled by the ECU 8.

The configuration and operation of the main part constituting the present invention will be described below.
<Oxygen separator>
As shown in the cross-sectional view of FIG. 2, the oxygen separation unit 1 as a nitrogen / oxygen separation membrane incorporates a cylindrical zeolite separation membrane 1b that selectively permeates nitrogen into a sealed cylindrical vessel 1a. It is a thing. The zeolite separation membrane 1b uses the difference in adsorption characteristics of nitrogen molecules and oxygen molecules to the zeolite (the adsorption amount of nitrogen molecules is several times larger than the adsorption amount of oxygen molecules). A pressure difference is applied between the inside and outside of the membrane to selectively permeate only nitrogen and produce oxygen-enriched air.
The oxygen separation unit 1 is connected to a branch passage 9 branched from the engine intake passage 51 on the inlet side of the sealed container 1a, and the downstream branch passage 9 to which oxygen-enriched oxygen-enriched air is sent out on the outlet side. It is connected to the. A pressure channel 2b communicating with the decompression pump 2a is connected to the side surface of the container 1a. The normal air introduced into the cylindrical zeolite separation membrane 1b (front chamber 1c) from the inlet side of the oxygen separation unit 1 flows through the front chamber 1c from the inlet side to the outlet side. Since the air in the section (rear chamber 1d) is sucked by the decompression pump 2a, only nitrogen passes through the zeolite separation membrane 1b and is sucked into the pressure flow path 2b, so that it is sent from the outlet side to the oxygen storage section. It is oxygen enriched air with a high oxygen concentration. On the other hand, the nitrogen sucked into the pressure channel 2b is discharged to the outside from the discharge channel 2d via the decompression pump 2a. The decompression pump 2a is driven by a drive source 2c that is operated by exhaust gas.
<Oxygen storage unit>

As shown in the schematic diagram of FIG. 3, the oxygen storage unit 3 incorporates an oxygen adsorbing unit 6 made of copper calcinate in a sealed container 3a. The oxygen adsorbing unit 6 is a perspective view of FIG. As shown in FIG. 4, the contact surface with the oxygen-enriched air sent from the oxygen separation unit 1 is widened, and is formed in a fin shape so that heat exchange is easy. Between each fin-like oxygen adsorbing portion, there is an air flow passage 3b through which oxygen-enriched air passes.
As the temperature lowering means of the oxygen adsorption section of the oxygen storage section, a cooling action can be used, and as the temperature increasing means, a heating action can be used. In the present embodiment, a refrigerant for car air conditioners (alternative chlorofluorocarbon, CO2, etc.) is used as a cooling medium, and warm water for engine cooling waste heat is used as hot water for heating.
Therefore, as shown in the cross-sectional views of FIGS. 5 and 6, a heating pipe 7 a and a cooling pipe 7 b constituting the heat exchanger 7 are embedded in the fin-like oxygen adsorption unit 6. On the inlet side of the heating pipe 7a, a hot water valve 7H is provided as a control unit for controlling the oxygen release amount of the oxygen adsorbing unit 6 by adjusting the flow rate of the heating hot water flowing in the heating pipe 7a, and the cooling pipe 7b. A cooling water valve 7 </ b> C is provided as a control unit for controlling the oxygen storage amount of the oxygen adsorbing unit 6 by adjusting the flow rate of the cooling medium flowing in the cooling pipe 7 b on the inlet side. The hot water valve 7H and the cooling water valve 7C are connected to the ECU 8, respectively.
<Oxygen adsorption part>

The storage of oxygen by the oxygen adsorption unit will be described. The oxygen adsorbing part is a porous copper calcinate thin film formed on a support base of a metal having a relatively high thermal conductivity (for example, copper). FIG. 7 shows storage by the oxygen adsorbing part. It is shown schematically. Copper calcinate forming the surface of the oxygen adsorbing portion is obtained by synthesizing an integrated metal complex by adding terephthalic acid to copper acetate. Its structure is that two-dimensionally polymerized metal carboxylate sheets are three-dimensionally integrated to form uniform micropores. The copper calcinate is cooled by a heat exchanger disposed inside the oxygen adsorbing portion, whereby oxygen molecules (O 2) are adsorbed on the micropores on the surface. Also, oxygen molecules are adsorbed by pressurization of the surrounding air (oxygen-rich air) in contact with copper calcinate. On the other hand, it has the property of releasing oxygen molecules when heated. That is, by pressing or cooling the adsorbent, only oxygen molecules are taken in from the surrounding air and stored, and by heating, the stored oxygen molecules are released to increase the oxygen concentration in the surrounding air.
The adsorbent (copper calcinate) can store 30 l of oxygen at 100 g (where l is the volume of oxygen molecules O 2 adsorbed on the adsorbent and g is the weight of the adsorbent).

Next, operation | movement of this oxygen enrichment apparatus 10 is demonstrated.
As shown in FIG. 1, the normal air introduced into the engine intake passage 51 from the outside passes through the air cleaner 52, and then is partially guided to the oxygen separation unit 1 via the branch passage 9. The normal air introduced into the oxygen separator 1 has only nitrogen (N2) in the outer peripheral portion (rear chamber) while passing through the hollow portion (front chamber 1c) of the cylindrical zeolite separation membrane 1b from the inlet side to the outlet side. It moves to 1d) and becomes air with high oxygen concentration (oxygen-enriched air). The oxygen-enriched air sent from the outlet side of the oxygen separation unit 1 is introduced into the oxygen storage unit 3 downstream. The oxygen storage unit 3 has a function of performing either oxygen storage or oxygen release on the supplied oxygen-enriched air based on a command from the ECU 8. At this time, the ECU 8 simultaneously controls the oxygen storage unit 3, the oxygen supply valve 4, and the throttle valve 53 to guide the oxygen concentration of the mixed intake air in the engine intake passage to a target value.

Control of the oxygen concentration of the mixed intake air supplied to the engine is performed as shown in the flowchart of FIG. 8 and the timing chart of FIG.
First, the ECU 8 determines an oxygen concentration request value (target value) and inputs an oxygen concentration measurement value as parameters for oxygen concentration control of the mixed intake air (step S1 in FIG. 8). The required oxygen concentration value determines the oxygen concentration of the air (intake) supplied to the engine in relation to the accelerator opening, and the oxygen concentration required value is determined based on the map of the accelerator opening and the oxygen concentration input to the ECU 8. It is determined. At the same time, the oxygen concentration detected by the O2 sensor 5 is input to the ECU 8 as an oxygen concentration measurement value. In step S2, the required oxygen concentration value is compared with the measured oxygen concentration value. If the required oxygen concentration value is larger than the measured oxygen concentration value (YES in step S2), the process proceeds to step S3.

Here, step S3 corresponds to the condition of switching 1 shown in the timing chart of FIG. 9, and the ECU 8 fully opens the hot water valve 7H of the heat exchanger 7, fully closes the cooling water valve 7C, and fully opens the oxygen supply valve 4. The operation of adjusting the opening of the throttle valve 53 is performed in parallel.
By opening the warm water valve 7H and supplying warm water to the heating pipe 7a of the heat exchanger 7 to heat the oxygen adsorbing part 6, oxygen molecules adsorbed on the surface of the oxygen adsorbing part 6 are released. Thus, the oxygen-enriched air introduced from the inlet side of the oxygen storage unit 3 is further increased in oxygen concentration and sent out from the outlet side, and sent to the mixed layer 54 through the oxygen supply valve 4 that is fully opened. At this time, the ECU 8 reduces the opening of the throttle valve 53 to reduce the amount of normal air flowing into the mixed layer 54. That is, the operation is performed so that the amount corresponding to the amount of oxygen-enriched air flowing from the oxygen supply valve 4 via the branch path 9 is reduced.

If the required oxygen concentration value is smaller than the measured oxygen concentration value in the comparison between the required oxygen concentration value and the measured oxygen concentration value in step S2 (NO in step S2), the process proceeds to step S4.
The condition for switching 2 shown in the timing chart of FIG. 9 is an example corresponding to step S4. The oxygen concentration required value (target value) of the mixed intake air supplied to the engine is set to a value (for example, 25%) higher than the atmospheric oxygen concentration (about 21%), but has been set and maintained in the switching 1 The value is set lower than the density. The ECU 8 fully closes the hot water valve 7H of the heat exchanger 7, and increases the refrigerant supplied to the cooling pipe 7b while gradually increasing the opening degree of the cooling water valve 7C. At the same time, the oxygen supply valve 4 is controlled to gradually reduce the valve opening. In the next step S2 of this series of control cycles (S1 to S4), if the required oxygen concentration value is smaller than the measured oxygen concentration value, the opening degree of the cooling water valve 7C is further increased and the oxygen adsorbing portion 6 is released. The amount of oxygen molecules is reduced to lower the oxygen concentration of the oxygen-enriched air, and the opening of the oxygen supply valve 4 is reduced to lower the oxygen concentration of the mixed intake air.

Thus, after the oxygen concentration requirement value of the mixed intake air is achieved, the oxygen-enriched air generated in the oxygen separation unit 1 is turned on as shown in B) Oxygen supply valve opening degree in the timing chart of FIG. It is sent to the mixed layer 54 of the engine intake passage 51 at a fixed opening that is considerably narrowed.
At this time, the opening degree of the throttle valve 53 is adjusted so that the flow rate of normal air is increased by the amount of decrease in the flow rate of oxygen-rich air due to the opening degree adjustment of the oxygen supply valve 4.
Since the hot water valve 7H is closed and the cooling water valve 7C is fully opened, the oxygen adsorbing portion 6 is cooled. Furthermore, the oxygen-rich air generated in the oxygen separation unit 1 and introduced into the container 3a of the oxygen storage unit 3 has a reduced flow rate that is sent to the engine intake passage 51 when the oxygen supply valve 4 is throttled. The pressure rises. Oxygen molecules are adsorbed on the surface of the oxygen adsorbing unit 6 by the cooling and pressurization of the oxygen adsorbing unit 6 (that is, oxygen is stored).

  The above series of operations is repeated as one cycle, and the oxygen concentration of the mixed intake air supplied to the engine is controlled to an optimum value.

(Embodiment 2)
FIG. 10 is an overall configuration diagram showing the oxygen enrichment apparatus 20 and its control system according to Embodiment 2 of the present invention.
The oxygen enrichment apparatus 20 shown in FIG. 10 is different from the oxygen enrichment apparatus 10 (Embodiment 1) in FIG. 1 in the oxygen separation unit. The oxygen separation part 1 of Embodiment 1 decompresses the outer peripheral part of a cylindrical zeolite separation membrane, extracts nitrogen from the air in the cylinder to the outside of the outer peripheral part, and against the air that passes through the cylinder in the axial direction. Oxygen enrichment. On the other hand, in the case of the oxygen separation unit 21 of the second embodiment, the first path through which the nitrogen-enriched air discharged outside through the zeolite separation membrane passes and the zeolite separation membrane do not pass through the container. A second path is provided through which the air (which becomes oxygen-enriched air because nitrogen moves into the first path). By sending air to the oxygen separation part 21 with the pressurizing pump 22a, a pressure difference is given with respect to a zeolite separation membrane, and oxygen-enriched air is produced | generated. Then, the oxygen-enriched air in the second path enriched with oxygen is sent to the oxygen storage unit 3. The nitrogen-enriched air in the first path is discharged to the outside from the discharge path 21d.
Other configurations and operations are the same as those of the first embodiment shown in FIG.

  In the first and second embodiments, the air introduced into the oxygen separation unit 1 (21) is branched and sent from the intake passage 51. However, the air may be directly introduced from the atmosphere. Moreover, although the zeolite separation membranes of Embodiments 1 and 2 are permeable to nitrogen, they may be permeable to oxygen to generate oxygen-enriched air.

  In the embodiment, heating of the oxygen adsorbing unit 6 of the oxygen storage unit 3 is configured such that a heating pipe is embedded in the oxygen adsorbing unit 6 and hot water is supplied. It is good also as composition to do.

It is explanatory drawing which shows the whole structure of the oxygen enrichment apparatus of Embodiment 1 of this invention. It is explanatory drawing of the oxygen separation part 1 in the sectional view on the AA line of FIG. 3 is a schematic diagram of an oxygen storage unit 3 according to Embodiment 1. FIG. 2 is a perspective view of an oxygen storage unit 3 according to Embodiment 1. FIG. It is XX sectional drawing in FIG. It is the YY sectional view taken on the line in FIG. It is explanatory drawing of oxygen adsorption by an oxygen adsorption part. It is a flowchart of oxygen enrichment apparatus control. It is a timing chart of oxygen concentration control of oxygen enriched air. It is explanatory drawing which shows the whole structure of the oxygen enrichment apparatus of Embodiment 2. FIG.

Explanation of symbols

1, 2: 1: Oxygen separator 1a: Container (oxygen separator)
2: Pressure difference generating part 1b: Zeolite separation membrane 3: Oxygen storage part 1c: Front chamber 4: Oxygen supply valve 1d: Rear chamber 5: O2 sensor 2a: Pressure reducing pump 6: Oxygen adsorption unit 2b: Pressure channel 7: Heat Exchanger 2c: Drive source 8: ECU (control device) 2d, 21d: Discharge path 9: Branch path 3a: Container (oxygen storage section)
10, 20: Oxygen enrichment device 3b: Air flow passage 50: Engine 7a: Heating pipe 51: Engine intake passage 7b: Cooling pipe 52: Air cleaner 7H: Hot water valve (regulator)
53: Throttle valve 7C: Cooling water valve (adjusting part)
54: Mixed layer 21a: First path
21b: Second route
22a: Pressurizing pump

Claims (9)

A pressure difference generating section that generates a pressure difference between both the front chamber and the rear chamber through the separation membrane, and normal air is introduced into the front chamber to allow oxygen or nitrogen to pass through the rear chamber, An oxygen separator for separating oxygen from the air;
An oxygen storage unit for storing oxygen-enriched air separated by the oxygen separation unit;
A control device that adjusts the amount of oxygen-enriched air stored in the oxygen storage unit with respect to normal air flowing through the engine intake passage;
In an oxygen enrichment apparatus comprising:
The oxygen storage unit includes an oxygen adsorbing unit that stores the oxygen-enriched air that has been separated by reducing the volume for storing the oxygen-enriched air and increasing the amount of oxygen-enriched air per predetermined volume. Device. The oxygen adsorbing part, a temperature lowering means for lowering the temperature of the oxygen adsorbing part and storing oxygen in the oxygen adsorbing part;
2. The oxygen enrichment device for an internal combustion engine according to claim 1, further comprising a temperature raising means for raising the temperature of the oxygen adsorbing portion to release oxygen from the oxygen adsorbing portion.   3. The oxygen enrichment apparatus for an internal combustion engine according to claim 2, further comprising the temperature lowering means, which is performed by supplying a refrigerant for an air conditioner to a heat exchanger.   3. The oxygen enrichment apparatus for an internal combustion engine according to claim 2, further comprising the temperature raising means, which is performed by supplying warm water for the heater to the heat exchanger.   An adjustment unit is provided that adjusts the supply amount of the air-conditioning refrigerant and the heater hot water to the heat exchanger and adjusts the amount of oxygen stored and released in the oxygen adsorption unit. The oxygen enrichment device for an internal combustion engine according to any one of claims 3 to 4.   The oxygen enrichment device for an internal combustion engine according to claim 1, wherein the separation membrane is a zeolite separation membrane.   7. The oxygen enrichment device for an internal combustion engine according to claim 1, wherein the control device controls a heating amount and a cooling amount of the oxygen adsorbing portion based on a driving situation of the vehicle. The control device includes a driving situation of the vehicle,
Information from the O2 sensor for detecting the oxygen concentration of the mixed intake air generated by mixing the normal air and the oxygen-enriched air released from the oxygen storage unit;
7. The oxygen concentration of the mixed intake air supplied to the engine is controlled by controlling the heating amount and cooling amount of the oxygen adsorbing portion and the opening degree of the oxygen supply valve based on the control. Enrichment device in an internal combustion engine.   The oxygen enrichment device for an internal combustion engine according to claim 1, wherein the oxygen adsorbing portion is made of copper calcinate.

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