KR101914981B1 - Industrial low-emission engine and facilities gardening system having the same and Engine control method - Google Patents

Abstract

The present invention relates to an industrial low-emission engine system, a facilities gardening system having the same, and an engine control method, wherein exhaust gas discharged after burning fuel in a combustion chamber of an engine passes through a catalyst to control an engine for harmful gas of the exhaust gas to be reduced. When the engine is continuously operated in one point more than specific time in a dangerous operation area more than a specific load, operation of the engine is controlled by returning to an original operation area after operating the engine by changing an operation area of at least one of a lower load and the lower number of rotation compared to a current operation area of the engine for a predetermined time. Therefore, oxygen storage ability of the catalyst is recovered to normalize discharged gas.

Description

Technical Field [0001] The present invention relates to a low-emission industrial engine system,

TECHNICAL FIELD The present invention relates to a low-pollution industrial engine system including facility horticulture, and more particularly, to a low-pollution industrial engine system that can restore the oxygen storage capacity of a catalyst and normalize exhaust gas, And a control method.

In general, a generator using a gas engine or a trailer system using a gas engine heat pump (GHP) uses low-cost gaseous fuels (natural gas, city gas, etc.) to perform heating (hot water supply), cooling and carbon dioxide And is configured to generate electric power by using a generator driven by a gas engine.

At this time, an industrial engine or a facility gardening engine used in conventional generators, geothermic and the like is characterized in that the number of revolutions of the engine or the number of revolutions of the engine is operated for a long time in the operation region of a specific load and a certain number of revolutions.

However, if the engine is operated for more than a certain time in the operating range above a certain load, the oxygen storage capacity of the catalyst, which serves to reduce the harmful gas in the exhaust gas, is lowered, do.

Accordingly, the exhaust gas is the exhaust gas discharged through the catalyst, even if higher concentrations, such as a hydrocarbon (HC) of harmful gases in the exhaust gas, carbon monoxide (CO) and nitrogen oxides (NO _X), and increases the air pollution, the exhaust from the engine There is a problem that it is difficult to utilize directly for the carbon dioxide fertilization required for the cultivation of crops in the facility horticultural house.

KR 10-0936983 B1 (2010.01.07)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-pollution industrial engine system including a plant for gardening, A low-pollution industrial engine system that enables the recovery of the oxygen storage capacity of the catalyst and the normalization of the exhaust gas by controlling the operation region of the engine by an appropriate operation region change algorithm when the operation state in the region occurs And to provide a facility gardening system and an engine control method.

According to an aspect of the present invention, there is provided an engine control method of an engine system for reducing exhaust gas flowing through a catalyst while exhausting a fuel from a combustion chamber of an engine, An operation region determination step of determining whether the engine is continuously operating at a point more than a specific time in a dangerous operation region of a specific load or more; Wherein the engine is operated in one of at least one of a lower load and a lower rotational speed than a present operating region of the engine for a predetermined time when the engine is continuously operated at a point longer than a specific time in the dangerous operation region, A region changing step; And returning to the original operation region again after the operation region changing step and operating the engine.

In addition, if the engine is continuously operated at a point longer than a specific time in the dangerous operation region beyond a specific load after the operation region returning step, the operation region changing step and the operation region returning step may be repeatedly performed.

The dangerous operation region may be an operation region of an engine load of 60 kPa or more.

Further, the specific time in the operation region determination step may be a phenomenon in which the phenomenon that the concentration of the noxious gas in the exhaust gas discharged through the catalyst starts to increase from the time when the engine starts to operate at a point in the dangerous operation region beyond a specific load Lt; / RTI > time.

Further, the specific time may be a time until a specific one of the noxious gas concentrations in the exhaust gas exceeds a preset reference value.

Also, the catalyst may include a first three-way catalyst installed in the exhaust pipe of the engine to remove noxious gases contained in the exhaust gas, and may include a front oxygen sensor installed in the exhaust pipe on the front side of the first three- And the rear oxygen sensor provided on the rear side exhaust pipe, the air-fuel ratio of the engine can be controlled.

The engine may also be an industrial or institutional garden engine.

And, the engine system for a low polluting industry of the present invention comprises an engine; A first three-way catalyst installed in an exhaust pipe of the engine to remove noxious gases contained in the exhaust gas; A front oxygen sensor disposed in front of the first three-way catalyst in a flow direction of the exhaust gas, and a rear oxygen sensor disposed behind the first three-way catalyst; And a controller connected to the engine, the front oxygen sensor, and the rear oxygen sensor, wherein when the engine is continuously operated at a point more than a specific time in a dangerous operation area of a specific load or more, The engine may be changed to at least one of the low engine speed region and the low engine speed region, and then the engine may be returned to the original operation region to operate the engine.

The apparatus may further include a second three-way catalyst provided in a rear-side exhaust pipe of the rear oxygen sensor in the flow direction of the exhaust gas.

Further, the facility horticultural system of the present invention is characterized by comprising: the engine system for the low-pollution industrial industry; And a facility horticultural house connected to the end of the exhaust pipe in the flow direction of the exhaust gas, wherein the exhaust gas from which the harmful gas is removed from the exhaust gas after combustion in the engine is used for the fertilization of the carbon dioxide in the facility horticultural house .

The radiator may further include a radiator connected to the engine to cool the engine. The radiator and the exhaust pipe may be used for heating the facility horticultural house.

The compressor may further include a compressor driven by the engine to compress the refrigerant. The refrigerant compressed by the compressor may be used for at least one of cooling and heating of the facility horticultural house.

Further, the apparatus further includes a generator driven by the engine to generate electricity, and electricity generated by the generator can be utilized in the facility for gardening.

In the present invention, when the oxygen storage capacity of the catalyst starts to decrease or is expected to decrease, the engine operation region is changed to an operation region that is lower than an engine load and a rotational speed lower than the current operation region, The exhaust gas discharged from the end of the exhaust pipe after the removal of the noxious gases can be directly returned to the facility horticultural house through the control method of the engine for restoring the oxygen storage capacity of the catalyst, And it can be utilized for the carbon dioxide fertilization stably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an engine system for a low-polluting industry according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION Field of the Invention [0001]
3 is a flowchart showing an engine control method according to an embodiment of the present invention.
4 is a conceptual diagram illustrating an operation area mapping area in an engine control method according to an embodiment of the present invention.
FIGS. 5 and 6 are graphs showing a divergence phenomenon of the exhaust gas due to a decrease in the oxygen storage capacity of the catalyst when the engine is continuously operated at a point in the dangerous operation region according to the conventional engine control method.
FIG. 7 is a graph illustrating a control method for a fuel amount correction according to an embodiment of the present invention.
FIG. 8 is a graph illustrating a state in which a threshold value for a voltage value measured by a rear oxygen sensor according to an exemplary embodiment of the present invention is set to a slightly rich value.
FIGS. 9 and 10 are graphs showing a state in which the exhaust gas is regulated to a normal level by restoring the oxygen storage capacity of the catalyst when the engine control method according to an embodiment of the present invention is applied.
FIG. 11 is a block diagram of a facility horticultural system according to an embodiment of the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the engine system for a low polluting industrial environment according to the present invention, the facility gardening system and the engine control method including the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an engine system for a low-polluting industry according to an embodiment of the present invention.

1, an engine system for a low-pollution industrial engine according to an embodiment of the present invention includes an engine 100, a first three-way catalyst 410, a second three-way catalyst 420, a front oxygen sensor 430, 440 and a control unit 500. [

The engine 100 can be, for example, a gas engine and the gas engine can be driven using relatively low cost gaseous fuels such as liquefied petroleum gas (LPG), natural gas, city gas, biogas and renewable fuels . An exhaust pipe 110 is connected to the engine 100, and an exhaust gas discharged from the combustion chamber of the engine 100 after the fuel is burned is exhausted through the exhaust pipe 110.

The first three-way catalyst 410 is installed in the exhaust pipe 110 of the engine 100 and removes noxious gases contained in the exhaust gas of the engine 100 to reduce the concentration of noxious gas in the exhaust gas.

The second three-way catalyst 420 may be additionally installed in the exhaust pipe 110 on the rear side of the rear oxygen sensor 440 in the flow direction of the exhaust gas according to the embodiment. Here, the first three-way catalyst 410 is referred to as a MCC (Manifold Catalyst Converter), and is mainly used for reducing carbon monoxide and hydrocarbons during cold start, and may also reduce some nitrogen oxides. Also, the second three-way catalyst 420 is called an underbody catalyst converter (UCC), and can simultaneously reduce carbon monoxide, hydrocarbon, and nitrogen oxides as a main catalyst. Thus, by removing the noxious gases in the exhaust gas once more by using the second three-way catalyst 420 installed further behind the rear oxygen sensor 440, the concentration of the nitrogen oxide can be kept close to zero.

The front oxygen sensor 430 and the rear oxygen sensor 440 measure the concentration of oxygen contained in the exhaust gas passing through the exhaust pipe 110 at the respective installed points, And a rear oxygen sensor 440 is installed in a rear exhaust pipe 110 of the first three-way catalyst 410. The front oxygen sensor 430 is installed in the exhaust pipe 110 on the front side of the first three-

The control unit 500 is connected to the engine 100, the front oxygen sensor 430 and the rear oxygen sensor 440. The control unit 500 periodically measures the rotational speed and the load of the engine 100, Or the like. In addition, the control unit 500 receives a signal regarding the oxygen concentration measured by the front oxygen sensor 430 and the rear oxygen sensor 440, and controls the air-fuel ratio of the engine 100 and the like.

According to an embodiment of the present invention, when the engine is continuously operated at a point longer than a specific time in a dangerous operation region of a specific load or more, The oxygen storage capacity of the catalyst is restored by changing to the operation region and then returning to the original operation region. The specific operation of the control unit 500 will be described later.

FIG. 2 is a view illustrating a facility horticultural system according to an embodiment of the present invention.

Referring to FIG. 2, the facility horticultural system according to an embodiment of the present invention includes a facility horticultural house 700 connected to the end of an exhaust pipe 110 of the low-pollution industrial engine system, The exhaust gas from which harmful gases have been removed from the exhaust gas that has been exhausted is utilized for fertilizing carbon dioxide in the facility horticultural house 700. [

The facility horticultural system according to an embodiment of the present invention includes a radiator 200 connected to the engine 100 to cool the engine 100, a compressor 300 driven by the engine 100 to compress the refrigerant, A generator 600 driven by the engine 100 to generate electricity, and the like. Thus, the cooling water of the radiator 200 can be utilized as the heating and hot water of the facility horticultural house 700, and at least one of cooling and heating of the facility horticultural house 700 using the refrigerant compressed by the compressor 300 And the electricity generated by using the generator 600 can be utilized in an electric device such as a lighting of the facility horticultural house 700. [

FIG. 3 is a flowchart illustrating an engine control method of a control unit according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram illustrating a driving region mapping area according to an exemplary embodiment of the present invention.

Referring to FIG. 3, an engine control method according to an exemplary embodiment of the present invention includes an operation region determination step (S100), an operation region change step (S200), and an operation region return operation (S300).

The operation region determination step S100 is a step of determining whether the current operation region in which the engine is currently operating is continuously operated at a point longer than a specific time in a dangerous operation region (see Fig.

Here, the dangerous operation region may be an operation region over a specific engine load, in which the oxygen storage capacity (OSC) of the catalyst is lowered and control of the concentration of the harmful gas in the exhaust gas in the catalyst becomes impossible. That is, the operation region determination step S100 measures the engine load, the engine speed, and the operation time, and determines the operation state of the engine at a point (constant engine load and rotation number) It is determined whether or not the engine is operating, and it is predicted in advance that the oxygen storage capacity (OSC) of the catalyst will be lowered. This oxygen storage capacity (OSC) is the ability of the catalyst to precisely control the oxygen concentration in the microspace. When the oxygen concentration in the exhaust gas discharged from the engine is too high or low, the removal rate of the noxious gas in the catalyst is greatly lowered. In order to reduce the variation range of the oxygen concentration, ceria (CeO ₂ ) And an oxygen storage capacity (OSC), which is a function capable of storing oxygen. Further, during the operation of the engine, since the engine air-fuel ratio deviates from the stoichiometric air-fuel ratio according to various conditions of the engine output, the adjustment is electronically controlled using an oxygen sensor. However, since this control can not be done completely, the purification efficiency is limited. Thus, precise control in the microspace by the catalyst itself is an oxygen storage capacity (OSC), and is becoming a basic technique of engine exhaust treatment.

 When the engine is continuously operated at a certain point in the dangerous operation region for a predetermined time or more and it is predicted that the oxygen storage capacity (OSC) of the catalyst will be lowered, the operation region changing step (S200) The engine is operated by changing the engine operating region to at least one of a lower load and a lower rotational speed so as to restore the oxygen storage capacity of the catalyst and normalize the exhaust gas.

That is, as shown in FIG. 4, it is possible to fix the number of revolutions in the current operation region and lower the load (1. rpm fixing, movement to the load fluctuation region) Fixed, moving to the rpm fluctuation area). Also, it is possible to restore the oxygen storage capacity of the catalyst by simultaneously lowering the engine load and the number of revolutions (movement to the load and rpm fluctuation region).

In the operation region returning step S300, the engine is operated for a predetermined time after changing the operation region, and then returned to the original operation region in the dangerous operation region and the engine is operated again. That is, after the oxygen storage capacity of the catalyst is recovered through the operation region changing step (S200), the operation is returned to the original operation region and the operation is continued, so that the operation can be continued by the load and the rotation number of the engine that was originally operated. Normalization can be achieved.

Thus, the engine control method of the present invention is capable of controlling the concentration of harmful gas in the exhaust gas in the exhaust gas due to a decrease in the oxygen storage capacity (OSC) of the catalyst, When the engine is operated for more than a predetermined time, the engine is temporarily changed to an operation region of at least one of an engine load and a revolution number lower than the current operation region, and then returned to the original operation region and controlled to operate, So that the concentration of the noxious gas in the exhaust gas is normalized to a preset reference value or less. Or when the oxygen storage capacity of the catalyst starts to decrease or is expected to decrease, the operation region of the engine is changed to an operation region of at least one of the engine load and the revolution number lower than the current operation region and then returned to the original operation region The control method of the engine can restore the oxygen storage capacity of the catalyst to normalize the exhaust gas and thereby continue operation at a point in the original operating area within the dangerous operating area.

If the engine is continuously operated at a point longer than a specific time in the dangerous operation region beyond a specific load after the operation region returning step S300, the operation region changing step S200 and the operation region returning step S300 are repeated .

In other words, if the engine is changed from the current operation region of the engine to the operation region of a lower load or the number of revolutions for a while and then returns to the original operation region and is operated, the operation can be continuously performed at a specific point in the dangerous operation region Therefore, by repeating the above steps, the oxygen storage capacity of the catalyst can be continuously restored.

As shown in FIG. 4, the dangerous operation region may be an operation region of an engine load of 60 kPa or more.

That is, irrespective of the number of revolutions of the engine, the oxygen storage capacity of the catalyst is lowered in a relatively high load operating region where the engine load is 60 kPa or more, so that the exhaust gas control can not be controlled in the catalyst. . Here, when the engine load is higher than 60 kPa, the higher the number of revolutions, the better the oxygen storage capacity of the catalyst is lowered. The meaning of the engine load of 60 kPa means that the measured value of the intake air pressure of the engine is 60 kPa, which is expressed as the load condition of the normal engine. That is, the engine opens the throttle valve and sucks air when the driver or the accelerator is depressed with the value already inputted. At this time, since the air is sucked in the air, the intake pressure is lower than the atmospheric pressure. Since the atmospheric pressure is 100 kPa, when the pressure is about 60 kPa, the throttle valve is opened.

FIGS. 5 and 6 are graphs showing a divergence phenomenon of the exhaust gas due to a decrease in the oxygen storage capacity of the catalyst when the engine is continuously operated at a point in the dangerous operation region according to the conventional engine control method.

Referring to FIGS. 5 and 6, the specific time in the operation region determining step S100 is determined based on the noxious gas concentration in the exhaust gas discharged through the catalyst from the point in time when the engine starts to operate at one point in the dangerous operation region, May be a time until a phenomenon in which the divergence starts to increase.

That is, for example, it can be seen that the concentration of nitrogen oxide (NOx) or the concentration of carbon monoxide (CO) is increased at about 30 minutes after the start of operation of the engine at a point in a dangerous operation region over a specific load, It can be seen that exhaust gas control in the catalyst becomes impossible after exceeding the preset reference value of the noxious gas concentration.

Accordingly, the specific time, which is the time during which the engine can be continuously operated at a point in the dangerous operation region, is determined based on the fact that the noxious gas in the exhaust gas, which is exhausted through the catalyst, To the point at which the phenomenon that the concentration begins to increase while diverging.

Further, the specific time may be a time until a specific one of the noxious gas concentrations in the exhaust gas exceeds a preset reference value.

That is, before the concentration of the noxious gas in the exhaust gas exceeds a preset reference value, the oxygen storage capability of the catalyst can be restored in advance and the exhaust gas control in the catalyst can be normalized.

The front oxygen sensor 430, the first three-way catalyst 410, and the rear oxygen sensor 440 are arranged in order in the exhaust gas flow direction in the exhaust pipe 110 connected to the engine 100 according to an embodiment of the present invention And the air-fuel ratio of the engine can be controlled using the oxygen concentration in the exhaust gas measured by the front oxygen sensor 430 and the rear oxygen sensor 440. At this time, the amount of fuel corrected by the value measured by the front oxygen sensor 430 and the amount of fuel corrected by the value measured by the rear oxygen sensor 440 are added to the basic fuel amount set in advance in the control unit 500, The amount of fuel supplied to the engine 100 can be controlled to be corrected. The control unit 500 may be provided with map data for the basic fuel amount that can control the lambda of the engine 100 to be the stoichiometric air-fuel ratio.

FIG. 7 is a graph illustrating a control method for a fuel amount correction according to an embodiment of the present invention.

7, in the control unit 500, the fuel amount corrected by the value measured by the front oxygen sensor 430 and the fuel amount corrected by the value measured by the rear oxygen sensor 440 are added to the mixer of the engine 100, The amount of fuel of the gaseous fuel supplied to the control valve 180 is corrected. At this time, the I gain control is performed through the value measured by the front oxygen sensor 430, the delay control is performed in the rich state and the lean state, and the P gain ratio So that the correction of the amount of fuel can be made.

FIG. 8 is a graph illustrating a state in which a threshold value for a voltage value measured by a rear oxygen sensor according to an embodiment of the present invention is set to a slightly rich value.

Referring to FIG. 8, it is possible to control the output of the rear oxygen sensor 440 to be fed back near the desired threshold value by adjusting the rich delay time and the lean delay time. At this time, So that the concentration of carbon monoxide is slightly increased and the concentration of nitrogen oxide is maintained at 0 (zero) or close to zero. For example, the voltage value measured and output from the rear oxygen sensor 440 is controlled to be a value (0.48 V) slightly higher than a reference value (0.45 V) corresponding to a predetermined stoichiometric air-fuel ratio to slightly increase the amount of generated carbon monoxide, The occurrence can be zeroed.

The engine may also be an industrial or institutional garden engine.

That is, an industrial engine or a facility gardening engine used for a generator or a geothermal device is characterized in that the number of revolutions of the engine and the number of revolutions do not change from time to time and are operated for a long period of time at a specific load and a certain point of rotation. The oxygen storage capability of the catalyst is restored and the function of controlling the exhaust gas in the catalyst can be normalized by using the control method of the engine in which the operation region of the engine of the engine is returned to the original operation region.

FIGS. 9 and 10 are graphs showing a state in which the exhaust gas is regulated to a normal level by restoring the oxygen storage capacity of the catalyst when the engine control method according to an embodiment of the present invention is applied.

9 and 10, the oxygen storage capacity (OSC) of the catalyst is lowered when the engine is operated for more than 30 minutes in the current operation region at a rotation speed of 2,000 rpm and a load of 70 kPa, which is one of the dangerous operation regions, The concentration of the noxious gas (NOx or CO) in the exhaust gas increased while radiating. As described above, when the engine is operated at a rotation speed of 2,000 rpm and a load of 70 kPa for 30 minutes or more, the concentration of carbon monoxide (CO) in the exhaust gas does not increase below the reference value but remains steady. Min for 1 hour, and then comes back to the normal range below the reference value. Alternatively, as described above, when the engine is operated at a rotational speed of 2,000 rpm and a load of 70 kPa for 30 minutes or more, the concentration of nitrogen oxides (NOx) in the exhaust gas does not increase below the reference value but remains normal. .

At this time, the load is changed to a relatively low load (30 to 40 kPa) while the revolution speed of the engine is fixed in the present operation region, or the operation is performed for 1 to 2 minutes or the load of the engine is fixed It is possible to change the number of revolutions by the number of revolutions (1300 ~ 1500rpm) and to operate for 1 ~ 2 minutes or to change the load at the relatively low load (30 ~ 40kPa) (1,300 to 1,500 rpm), and then the operation is performed for 1 to 2 minutes. Thereafter, the operation is returned to the operation region of 2,000 rpm of revolution and the load of 70 kPa, which is the original operation region. If the operation is repeated for more than 30 minutes in the dangerous operation region, the same method as above can be repeatedly applied. In this case, it is effective to change both the load and the rotational speed of the engine to maximize the effect of restoring the oxygen storage capacity of the catalyst, and then to change the load with the rotational speed of the engine fixed. Finally, It may be effective to change the number of revolutions while the load is fixed. (Effect size: number of revolutions and load variation> variation only in load> variation in number of revolutions)

In general, when the oxygen storage capacity (OSC) of the catalyst is not lowered, the exhaust gas may react normally and be zeroed even if the air-fuel ratio for catalysis is fluctuated. However, when operating for more than 30 minutes in a fixed operating region within a relatively high load operating area, the fuel amount correction control (lean delay control and rich delay control) for the oxidation-reduction reaction occurring in the catalyst due to the decrease of the oxygen storage capacity (OSC) Control) width is extremely precisely (shortened), and the exhaust gas diverges to the fluctuation of the air-fuel ratio artificially generated in the first three-way catalyst to exceed the control target value (noxious gas concentration reference value). At this time, if the load or the rotational speed is changed or the load and the rotational speed are simultaneously changed, the precise control range of the control unit (ECU) is changed and the control range (lean delay, rich delay) The control can be normalized again.

As a result of operating the engine by using the engine control method of the present invention and by changing the engine load and rotation speed, the concentration of nitrogen oxides and carbon monoxide, which are noxious gases in the exhaust gas, ≪ / RTI >

As described above, according to the present invention, when the engine is operating continuously for a predetermined time or more continuously at a point in the operating region of the engine, which may become impossible to control the concentration of noxious gas in the exhaust gas in the catalyst, (OSC) deteriorates or is expected to be lowered, the operation is temporarily changed to an operation region of at least one of the engine load and the rotational speed lower than the current operation region, and then the operation is returned to the original operation region It is possible to restore the oxygen storage capacity of the catalyst and to normalize the concentration of the noxious gas in the exhaust gas to a predetermined reference value or less so that the operation can be continued at a point in the original operation region in the dangerous operation region.

FIG. 11 is a view illustrating a facility horticultural system according to an embodiment of the present invention.

Referring to FIG. 11, the facility horticultural system according to an embodiment of the present invention includes: the engine system for the low-polluting industry; And a facility horticultural house 700 connected to the end of the exhaust pipe 110 in the flow direction of the exhaust gas, wherein the exhaust gas discharged after the combustion in the engine 100 is exhausted from the exhaust gas, It can be utilized for fertilizing carbon dioxide in the facility horticultural house 700.

That is, by connecting the end of the exhaust pipe 110 of the engine system for low-pollution industry to the facility horticultural house 700, the exhaust gas discharged through the end of the exhaust pipe 110 after the noxious gases are removed, Can be supplied to the horticultural house 700 and utilized stably for carbon dioxide fertilization. At this time, the carbon dioxide and nitrogen contained in the exhaust gas can be utilized in the crop of the facility horticultural house 700.

The facility horticultural system according to an embodiment of the present invention further includes a radiator 200 connected to the engine 100 to cool the engine 100. The radiator 200 and the exhaust pipe 110 And can be utilized for heating the facility horticultural house 700 by using any one or more waste heat.

That is, the heat generated by the driving of the engine 100 can be used for heating the facility horticultural house 700 and the cooling water of the radiator 200 for circulating the cooling water for cooling the engine 100 or the exhaust pipe 110) can be utilized as heating or hot water.

The compressor (300) further includes a compressor (300) driven by the engine (100) to compress the refrigerant. The refrigerant compressed by the compressor (300) It can be used for more than one.

That is, the refrigerant can be compressed by using the compressor 300 connected to the engine 100, and utilized for cooling the facility horticultural house 700 using the compressed refrigerant. Alternatively, a heat pump using compressed refrigerant may be used to switch between heating and cooling.

The power generator 600 may further include a generator 600 driven by the engine 100 to generate electricity. The electricity produced by the generator 600 may be utilized in the facility horticultural house 700.

That is, electricity is generated using the generator 600 connected to the engine 100, and the generated electricity can be utilized in an electric device such as lighting of the facility horticultural house 700.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

100: engine
110: Exhaust pipe
200: Radiator
300: Compressor
410: first three-way catalyst
420: second three-way catalyst
430: Front oxygen sensor
440: rear oxygen sensor
500:
600: generator
700: Facilities Garden House

Claims (13)

An engine control method for an engine system in which exhaust gas discharged after a fuel is combusted in a combustion chamber of an engine passes through a catalyst and noxious gas in the exhaust gas is reduced,
An operation region determining step of determining whether the engine is continuously operating at a point longer than a specific time in a dangerous operation region of a specific load or more;
Wherein the engine is operated in one of at least one of a lower load and a lower rotational speed than a present operating region of the engine for a predetermined time when the engine is continuously operated at a point longer than a specific time in the dangerous operation region, A region changing step; And
And returning to the original operation region again after the operation region changing step,
And the engine control method comprising:
The method according to claim 1,
Wherein the operation region changing step and the operation region returning step are repeatedly performed when the engine is continuously operated at a point longer than a specific time in the dangerous operation region beyond a specific load after the operation region returning step.
The method according to claim 1,
And the dangerous operation region is an operation region of an engine load of 60 kPa or more.
The method according to claim 1,
The specific time in the operation region determination step is a period of time from when the engine starts to operate at one point in the dangerous operation region beyond a specific load until a point where the concentration of the noxious gas in the exhaust gas discharged through the catalyst starts to increase while diverging ≪ / RTI >
5. The method of claim 4,
Wherein the specific time is a time until a concentration of one specific noxious gas in the exhaust gas exceeds a preset reference value.
The method according to claim 1,
The catalyst includes a first three-way catalyst installed in an exhaust pipe of the engine to remove noxious gases contained in the exhaust gas,
Wherein the air-fuel ratio of the engine is controlled through a front oxygen sensor provided on a front-side exhaust pipe of the first three-way catalyst and a rear oxygen sensor provided on a rear-side exhaust pipe in a flow direction of the exhaust gas.
The method according to claim 1,
Wherein the engine is an engine for industrial or institutional gardening.
engine;
A first three-way catalyst installed in an exhaust pipe of the engine to remove noxious gases contained in the exhaust gas;
A front oxygen sensor disposed in front of the first three-way catalyst in a flow direction of the exhaust gas, and a rear oxygen sensor disposed behind the first three-way catalyst; And
Wherein the engine is connected to the engine, the front oxygen sensor, and the rear oxygen sensor, and when the engine is continuously operated at a point more than a specific time in a dangerous operation area of a specific load or more, The engine is operated again after returning to the original operation region by changing to the operation region of at least one of the engine speed,
And a low-pollution industrial engine system.
9. The method of claim 8,
Further comprising a second three-way catalyst provided in a rear-side exhaust pipe of a rear oxygen sensor in a flow direction of the exhaust gas.
An engine system for a low pollutant industry according to claim 8 or 9; And
And a facility horticultural house connected to the end of the exhaust pipe in the flow direction of the exhaust gas,
Wherein the exhaust gas discharged from the engine after the combustion is exhausted from the exhaust gas from which the harmful gas has been removed, is utilized for fertilizing the carbon dioxide in the facility horticultural house.
11. The method of claim 10,
Further comprising a radiator coupled to the engine to cool the engine,
Wherein the heating is utilized for heating the facility horticultural house using waste heat of any one of the radiator and the exhaust pipe.
11. The method of claim 10,
Further comprising a compressor driven by the engine to compress the refrigerant,
Wherein the refrigerant is utilized for at least one of cooling and heating of the facility horticultural house using the refrigerant compressed by the compressor.
11. The method of claim 10,
Further comprising a generator driven by the engine to generate electricity,
And electricity generated by the generator is utilized in the facility horticultural house.

Images