JPH0913960A - Combined system for heating device and cooling device for catalyst - Google Patents

Abstract

PURPOSE: To provide a combined system for a heating device and a cooling device for a catalyst having good energy efficiency. CONSTITUTION: This combined system is constituted of a heating device 10 for a catalyst reducing and purifying exhaust gas 81 and a cooling device 20 depriving heat from the surrounding via a heat exchanger 21. The heating device 10 has a heating means such as a heat absorbing agent heated when it receives a refrigerant of the cooling device 20. A passage 31 connecting the cooling device 20 and the heating device 10 and feeding the refrigerant 29 and an opening/closing means (solenoid valve) 32 opening or closing the passage 31 are provided between the cooling device 20 and the heating device 10. A control means 40 operating the opening/closing means 32 to control degree of cooling or heating is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine system for a vehicle in which a catalyst heating device and a cooling device such as a cooling device are linked.

[0002]

2. Description of the Related Art An exhaust gas purification device for purifying harmful components of exhaust gas is provided in an exhaust passage of an automobile engine. A three-way catalyst that exhibits excellent purification characteristics for harmful carbon monoxide, hydrocarbons, and nitrogen oxides is used as a catalyst for an exhaust purification device. Further, in a diesel engine in which combustion is performed in an oxygen excess state compared to the stoichiometric air-fuel ratio, the composition of the exhaust gas is in an oxygen excess (lean) state, and a catalyst device using a metal-supported zeolite that exhibits excellent characteristics even in a lean atmosphere. Is used.

In order to activate the above catalysts, a constant high temperature is required in all cases, and it is common to provide some kind of heating device when the temperature of exhaust gas is low such as when the engine is started. Is. For example, Japanese Patent Laid-Open No. 5-263
Japanese Patent No. 627 proposes a method of heating a catalyst device using an electric heater or the like. On the other hand, recently, most vehicles are provided with a cooling device. Then, the thermal energy of the refrigerant, which has been absorbed by cooling the air in the vehicle compartment, is released to the outside of the vehicle, and a large amount of energy is consumed to maintain the thermal cycle of the refrigerant.

[0004]

However, in the conventional exhaust emission control device, a device for heating the catalyst must be separately provided, which increases the energy consumption of the vehicle and causes the catalyst device to increase in size. . Similarly, energy saving of the cooling device is also an important issue. The present invention
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a combine system of a catalyst heating device and a cooling device, which has good energy efficiency.

[0005]

The present invention provides a combine system for a vehicle comprising a catalyst heating device for reducing and purifying engine exhaust gas, and a cooling device configured to remove heat from the surroundings via a heat exchanger. Then, the heating device has a heat generating means that takes in the refrigerant of the cooling device and generates heat, and a flow passage that connects both devices and circulates the refrigerant between the cooling device and the heating device. And a control means for controlling the degree of cooling or heating by operating the opening / closing means and the opening / closing means for opening / closing the flow passage. It is in the combine system of the device and the cooling device.

What is most noticeable in the present invention is that the heating device for the catalyst is provided with a heating means for taking in the refrigerant of the cooling device to generate heat, and both devices are connected between the cooling device and the heating device. A flow passage for circulating the refrigerant and an opening / closing means for opening / closing the flow passage are provided, and a control means for operating the opening / closing means to control the degree of cooling or heating is provided. .

An adsorbent that adsorbs a refrigerant to generate heat is provided in the heat generating means that takes in some kind of refrigerant to generate heat, and the heat of adsorption (for example, heat generated when zeolite adsorbs water) is utilized. There are things. The cooling device includes a cooling device (including a cooling auxiliary device) that cools the air in the passenger compartment.

In the above structure, a temperature detecting means for detecting or estimating the temperature of the catalyst is further provided, and the control means receives the output signal of the temperature detecting means so that the catalyst temperature exceeds a predetermined temperature T2. It is preferable to control the opening / closing means to be closed when the temperature rises and to open the opening / closing means when the temperature becomes equal to or lower than a predetermined temperature T1. The catalyst has a predetermined temperature T2
By stopping the inflow of the refrigerant at the stage of exceeding the temperature, the catalyst is not overheated, and when the temperature becomes equal to or lower than the predetermined temperature T1, the opening / closing means is opened again to keep the catalyst within the appropriate temperature range. It becomes possible. Further, when the heat generating means is an adsorbent or the like, when the temperature of the adsorbent exceeds a predetermined value, there is a problem that the refrigerant is released and the cooling device is heated (heat backflow phenomenon). It is possible to prevent it from occurring.

Alternatively, as another preferable configuration,
In the above configuration, further, a refrigerant amount detecting means for detecting or estimating the amount of the refrigerant in the cooling device is provided, and the control means receives the output signal of the refrigerant amount detecting means, and once the refrigerant amount decreases once again, It is preferable to control so that the opening / closing means is closed when the number starts to increase. The fact that the amount of refrigerant once decreases and then starts to increase again means that the heat flow is reversed and the cooling device is heated.However, when such a phenomenon is detected, the opening / closing means of the flow passage is closed. By doing so, it is possible to prevent the heat flow from being reversed and the cooling device from being heated.

Similarly, as another preferred configuration,
In the above configuration, further, a direction detecting means for detecting or estimating the direction of the flow of the refrigerant in the flow passage connecting the both devices is provided, and the control means receives the output signal of the direction detecting means and receives the flow of the refrigerant. It is preferable to control the opening / closing means to be closed when the direction of (1) changes from the direction of flowing toward the heating device to the direction of flowing toward the cooling device. This is because it is possible to prevent the heat flow from being reversed and the cooling device to be heated similarly.

The cooling device includes, for example, a cooling device (or a cooling auxiliary device that supplements the main cooling device) for exchanging heat with the air in the passenger compartment. When the cooling device is a cooling device, the cooling device is provided with a first flow path for taking in air in the vehicle interior and a second flow path for taking in air outside the vehicle, and the cooling device is provided with the first or second cooling device. It is preferable to provide a switching unit that is selectively connected to the flow path and control the switching unit according to the thermal state (heat generation or heat absorption state) of the cooling device and the temperature state of the air in the passenger compartment.

With this configuration, the catalyst device is maintained at a desired temperature state, while the heat or cold heat generated on the cooling (auxiliary) device side by this depends on the state of the air in the passenger compartment. It can be used appropriately. That is,
When the heat generated in the cooling device brings the air in the passenger compartment into a more preferable state, the cooling device is connected to the first flow path, and the heat generated in the cooling device does not lead the air in the passenger compartment to the preferable state. A cooling device is connected to the second flow path. That is, the above-mentioned structure has a primary purpose to control the temperature of the catalyst device, and attempts to utilize the heat or heat generated at this time as effectively as possible in the cooling device.

[0013]

In the combine system according to the present invention, the heating device for the catalyst takes in the refrigerant from the cooling device to generate heat, while the cooling device supplies the refrigerant to evaporate and expand the internal refrigerant to lower the temperature. However, heat can be taken from the outside through the heat exchanger to cool it. As a result, heat flow can be generated between the catalyst heating device and the cooling device to realize heating and cooling at the same time, and the overall thermal efficiency can be improved.

Further, an opening / closing means is provided in the refrigerant flow passage connecting the two devices, and a desired heat flow is generated between the two devices by controlling the opening / closing means by the control means. Can be prevented. As described above, according to the present invention, it is possible to provide a combine system of a catalyst heating device and a cooling device, which has good energy efficiency.

[0015]

【Example】

Example 1 In this example, as shown in FIG. 1, a heating device 10 for a catalyst (catalyst device 80) for reducing and purifying engine exhaust gas 81,
Combine system 1 for a vehicle, comprising a cooling device 20 configured to remove heat from the surroundings via a heat exchanger 21
It is. The heating device 10 has a heating unit that takes in the refrigerant 29 of the cooling device 20 to generate heat, and the cooling device 20
Between the heating device 10 and the heating device 10, there are provided a flow passage 31 that connects the devices 10 and 20 and allows the refrigerant 29 to flow therethrough, and an opening / closing means (electromagnetic valve) 32 that opens and closes the flow passage 31. A control unit (ECU) 40 for controlling the degree of cooling or heating by operating the opening / closing unit 32 is provided. The heat generating means has an adsorbent 11 that adsorbs the refrigerant 29 and generates heat. The refrigerant 29 is pure water and the adsorbent 11
Is a zeolite.

Further, a temperature detecting means (temperature sensor) 41 for detecting the temperature of the catalyst and a refrigerant amount sensor 42 for detecting the amount of the refrigerant 29 of the cooling device 20 are provided, and the control means 40 has this temperature detecting means. The electromagnetic valve 32 is controlled in response to the output signals of 41 and the refrigerant amount sensor 42. For example, when the engine is started, as shown in steps 601 to 604 of FIG. 2, it is detected that the catalyst temperature is low and the amount of the refrigerant 29 is the normal value W1 or more, and the solenoid valve 32 is opened.
The inside of the cooling device 20 and the heating device 10 connected by the flow passage 31 is maintained in a low-pressure vacuum state, and when the electromagnetic valve 32 is opened, the refrigerant 29 flows through the flow passage 31 to the heating device 10 side. Adsorbed on the adsorbent 11. When the adsorbent 11 adsorbs the refrigerant 29, heat of adsorption is generated, and the catalyst is heated via the case 801 of the catalyst device 80.

At this time, at the same time, on the side of the cooling device 20, the refrigerant 29 is newly evaporated as the amount of the refrigerant 29 decreases and the temperature decreases, so that heat is taken from the outside air via the heat exchanger 21. FIG.
In, reference numeral 22 is a fan for promoting heat exchange. When the engine operates and the temperature of the exhaust gas rises and the temperature of the catalyst rises, the temperature of the adsorbent 11 rises via the case 801, and the adsorbent 11 desorbs the refrigerant 29. Then, the desorbed refrigerant 29 flows back to the cooling device 20 side this time.

In this case, the control means 40 determines that the temperature of the catalyst 81 exceeds the predetermined temperature T2 from the output signals of the temperature sensor 41 and the refrigerant amount sensor 42 as shown in steps 605 to 607 of FIG. When it is detected that the amount of 29 is equal to or greater than the predetermined value W2, the electromagnetic valve 32 is closed to stop the flow of the refrigerant 29 and suppress the reverse heating of the cooling device 20.
The above is the control flow when the engine is started.

Even after the engine is started, for example, if the idling continues for a long time, the temperature of the catalyst may drop below a predetermined value T1. In this case as well, through step 610 in FIG. 2, similar control is performed to heat the catalyst and suppress heating of the cooling device 20. FIG. 2 is a flowchart showing the flow of the above control.

As described above, in the combine system 1 of this example, the catalyst heating device 10 takes in the refrigerant 29 of the cooling device 20 to generate heat, while the cooling device 20 supplies the refrigerant 29 to generate the internal heat. The refrigerant 29 evaporates and expands to lower the temperature, and heat can be taken from the outside through the heat exchanger 21 to cool it. As a result, the catalyst heating device 10
It is possible to improve the overall thermal efficiency by generating a heat flow between the cooling device 20 and the cooling device 20 to realize heating and cooling at the same time.

An opening / closing means (electromagnetic valve) 32 is provided in the refrigerant flow passage 31 connecting the two devices 10 and 20, and the control means 40 controls the opening / closing means 32.
It is possible to generate a desired heat flow between both devices 10 and 20 and prevent unnecessary heat flow. as mentioned above,
According to this example, it is possible to provide the combine system 1 of the catalyst heating device 10 and the cooling device 20 with good energy efficiency.

Second Embodiment In this embodiment, as shown in FIG. 3, in the first embodiment, the cooling device 20 is provided with a first passage 35 for taking in the air in the passenger compartment and a second passage 36 for taking in the air outside the vehicle. Further, a switching means (switching valve) 37 for selectively connecting the cooling device 20 to the first or second flow paths 35, 36 is provided, and the control means 40 controls the thermal state of the cooling device 20 and the vehicle state. This is another embodiment in which the switching means 37 is controlled according to the temperature condition of the air in the chamber.

As described above, when the temperature of the catalyst rises and the refrigerant 29 desorbs from the adsorbent 11, the temperature of the cooling device 20 rises. And in the normal case, the cooling device 2
Since it is not preferable that 0 heats the air in the passenger compartment, in this example, the switching valve 37 is operated so as to open the second flow path 36 side. Therefore, the air in the vehicle compartment is not heated by the cooling device 20, and unnecessary heat is released to the outside. Others are the same as in the first embodiment.

In the first and second embodiments, the solenoid valve 32 is automatically controlled by the automatic control means 30, but the solenoid valve 3 is manually operated by a key switch or the like.
If 2 is operated, a cheaper device can be obtained. Further, in the first and second embodiments, the heating device 10 directly heats the catalyst device 80. However, the exhaust pipe line upstream of the catalyst device 80 is heated to heat the exhaust gas, thereby indirectly heating the catalyst device 80. You may. Further, the cooling device 10 can also be used as an auxiliary device for a main cooling device provided separately.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a combine system according to a first embodiment.

FIG. 2 is a control flowchart of the combine system according to the first embodiment.

FIG. 3 is a configuration diagram of an air flow path of the cooling device according to the second embodiment.

[Explanation of symbols]

 1. . . Combine system 10. . . Heating device 11. . . Adsorbent 20. . . Air conditioner 21. . . Heat exchanger 29. . . Refrigerant 31. . . Flow passage 32. . . Opening / closing means 40. . . Control means

Claims (8)

[Claims] 1. A combine system for a vehicle comprising a catalyst heating device for reducing and purifying exhaust gas of an engine, and a cooling device configured to remove heat from the surroundings via a heat exchanger. The device has a heat generating means for taking in the refrigerant of the cooling device and generating heat, and between the cooling device and the heating device, a flow passage for connecting both devices and flowing the refrigerant and a flow passage for this flow passage are provided. An opening / closing means for opening and closing is provided, and a control means for controlling the degree of cooling or heating by operating the opening / closing means is further provided. Combine system. 2. The combine system of a catalyst heating device and a cooling device for a vehicle according to claim 1, wherein the heat generating means has an adsorbent that adsorbs the refrigerant and generates heat. 3. The temperature detecting means for detecting or estimating the temperature of the catalyst according to claim 1 or 2, wherein the control means receives the output signal of the temperature detecting means and receives the catalyst temperature. Is controlled to close the opening / closing means when the temperature exceeds a predetermined temperature T2, and to open the opening / closing means when the temperature becomes equal to or lower than the predetermined temperature T1. Combine system. 4. The refrigerant amount detection means for detecting or estimating the amount of refrigerant in the cooling device according to claim 1 or 2, wherein the control means is an output signal of the refrigerant amount detection means. In response to this, when the amount of the refrigerant once decreases and then increases again, the opening / closing means is controlled to be closed, and the combine system of the catalyst heating device and the cooling device for a vehicle. 5. The direction detecting means according to claim 1 or 2, further comprising a direction detecting means for detecting or estimating a flow direction of a refrigerant in a flow passage connecting the both devices, wherein the control means detects the direction. When the output signal of the means is received and the direction of the flow of the refrigerant is changed from the direction of flowing toward the heating device to the direction of flowing toward the cooling device, the opening / closing means is controlled to be closed. Combined system for heating and cooling of catalysts for vehicles. 6. The catalyst for a vehicle according to claim 1, wherein the cooling device is a cooling device that exchanges heat with the air in the passenger compartment. Combine system of heating device and cooling device. 7. The air conditioner according to claim 6, wherein:
A first flow path for taking in the air in the vehicle compartment and a second flow path for taking in the air outside the vehicle are provided, and a switching means for selectively connecting the cooling device to the first or second flow path is provided. The control system controls the switching means in accordance with a thermal state of the cooling device and a temperature state of the air in the passenger compartment, the combine system of a heating device and a cooling device for a catalyst for a vehicle. 8. The combine of a heating device and a cooling device for a catalyst for a vehicle according to claim 2, wherein the adsorbent is zeolite and the refrigerant is water. system.