CN110529270A - A kind of control method of engine exhaust temperature elevation system - Google Patents
A kind of control method of engine exhaust temperature elevation system Download PDFInfo
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- CN110529270A CN110529270A CN201910778248.3A CN201910778248A CN110529270A CN 110529270 A CN110529270 A CN 110529270A CN 201910778248 A CN201910778248 A CN 201910778248A CN 110529270 A CN110529270 A CN 110529270A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0082—Controlling each cylinder individually per groups or banks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
Abstract
The present invention relates to engine arts, disclose a kind of control method of engine exhaust temperature elevation system.The control method of engine exhaust temperature elevation system provided by the invention, by the connection aperture for increasing the exhaust outlet of the second air cylinder group and the air inlet of air cylinder group, the air capacity that EGR circulation is used in the exhaust of second air cylinder group can be increased, in the case that total air inflow is constant, it will be reduced into the cold air amount in air cylinder group, increase the intake air temperature of air cylinder group, correspondingly the delivery temperature of air cylinder group will so increased, then increase the intake air temperature of exhaust gas post-treatment device, the intake air temperature of exhaust gas post-treatment device is set to meet the fuel oil injection conditions of the requirement of SCR initiation temperature and DPF initiative regeneration.
Description
Technical field
The present invention relates to engine art more particularly to a kind of control methods of engine exhaust temperature elevation system.
Background technique
Exhaust aftertreatment sets device and is located in the exhaust pipe in engine turbine downstream, to reduce or remove gas such as nitrogen oxygen
Compound (NO or NO2, it is referred to as NOx) and the pollutants such as particle emission, to reach the requirement of emission regulation.
Existing various types of exhaust gas post-treatment device, such as SCR technology (SCR) is to be directed to
NO in exhaust gas from diesel vehicle dischargexThat is, under the effect of the catalyst a kind of technique handled is quantitatively given in last handling process
Material unit according to the instruction accurate that engine electric-controlled unit provides can spray into the urea to match with engine operation condition
In exhaust pipe, the ammonia and nitrogen oxides that urea decomposites ultimately produce in SCR catalyst by catalytic reduction reaction harmless
Nitrogen and water.
Diesel particulate filter (DPF) is mounted in engine exhaust system, and is reduced by filtering in exhaust
The device of grain object.Diesel particulate filter captures particle by the filter device of surface and internal mix, such as precipitin, used
Property precipitating or it is linear intercept, can effectively purify in exhaust 70%~90% particle, be purification diesel engine particulate matter most
Effectively, one of most direct structure.
Wherein temperature is the important parameter for influencing SCR system transformation efficiency and dpf regeneration efficiency, under the same terms, temperature
Higher, the efficiency of SCR catalyst conversion is higher, and the regeneration efficiency of DPF is higher.The world's uniform effluent wink required in emission regulation
The operation characteristic of state test loop WHTC discharge cycle is that the slow-speed of revolution, underload, low row's temperature area are more, cause delivery temperature without
Method meets the fuel oil injection conditions of the requirement of SCR initiation temperature and DPF initiative regeneration.
Summary of the invention
The purpose of the present invention is to provide a kind of control methods of engine exhaust temperature elevation system, are able to solve the prior art
Middle delivery temperature is relatively low and the problem of lead to not to meet the fuel oil injection conditions of the requirement of SCR initiation temperature and DPF initiative regeneration.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of control method of engine exhaust temperature elevation system, engine include air cylinder group and exhaust gas post-treatment device, institute
State the second air cylinder group that air cylinder group includes the first air cylinder group and setting connected in parallel；The exhaust outlet of first air cylinder group with it is described
The air inlet of exhaust gas post-treatment device is connected to；The exhaust outlet of second air cylinder group selectively with the exhaust gas post-treatment device
Air inlet and/or the air cylinder group air inlet connection；
When the intake air temperature of exhaust gas post-treatment device is less than the first preset temperature, increase the exhaust of second air cylinder group
The connection aperture of mouth and the air inlet of the air cylinder group makes the intake air temperature of exhaust gas post-treatment device be more than or equal to the first default temperature
Degree.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, in second gas
When the connection aperture maximum of the exhaust outlet of cylinder group and the air inlet of the air cylinder group, if the intake air temperature of exhaust gas post-treatment device is still
Less than the first preset temperature, then reduce the company of the exhaust outlet of second air cylinder group and the air inlet of the exhaust gas post-treatment device
Degree of opening up makes the intake air temperature of exhaust gas post-treatment device be more than or equal to the first preset temperature.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system is reducing described the
While the connection aperture of the air inlet of the exhaust outlet of two air cylinder groups and the exhaust gas post-treatment device, reduce second cylinder
Fuel quantity in group increases described the under the premise of total fuel quantity is equal to total fuel quantity corresponding with engine current loads
Fuel quantity in one air cylinder group.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, in first gas
When fuel quantity in cylinder group reaches total fuel quantity, if the intake air temperature of exhaust gas post-treatment device still less than the first preset temperature,
The aperture for being set to the intake-air throttle valve of the air cylinder group air inlet is adjusted, the intake air temperature of exhaust gas post-treatment device is more than or equal to
First preset temperature.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, in first gas
The air-fuel ratio of cylinder group is equal to the first default air-fuel ratio, then first air cylinder group is kept the first default air-fuel ratio.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system is increasing described the
Before the connection aperture of the exhaust outlet of two air cylinder groups and the air inlet of the air cylinder group, further includes:
Obtain engine current loads；
When engine current loads are less than the first default load, increase the exhaust outlet and the gas of second air cylinder group
The connection aperture of the air inlet of cylinder group.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, it is current in engine
When load is greater than the first default load and less than the second default load, if the intake air temperature of the exhaust gas post-treatment device is less than
First preset temperature, the then air-fuel ratio for adjusting first air cylinder group make it equal to the first default air-fuel ratio.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, in first gas
When the air-fuel ratio of cylinder group is less than the first default air-fuel ratio, reduce described in fuel quantity and/or the increase of first air cylinder group
The aperture of intake-air throttle valve；
When the air-fuel ratio of first air cylinder group is greater than the first default air-fuel ratio, increase first air cylinder group
Fuel quantity and/or the aperture for reducing the intake-air throttle valve.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, in first gas
When the air-fuel ratio of cylinder group is equal to the first default air-fuel ratio, if the intake air temperature of the exhaust gas post-treatment device is still less than described
The air-fuel ratio of first air cylinder group is then kept the first default air-fuel ratio, and adjusts described second by the first preset temperature
The air-fuel ratio of air cylinder group makes it equal to the second default air-fuel ratio.
A kind of optimal technical scheme of control method as above-mentioned engine exhaust temperature elevation system, engine are in
It is cold-started under operating condition, the connection aperture of the air inlet of the exhaust outlet and air cylinder group of second air cylinder group is maximum and described
The connection aperture of the air inlet of the exhaust outlet of second air cylinder group and the exhaust gas post-treatment device is zero, and first air cylinder group
Interior fuel quantity is equal to total fuel quantity corresponding with engine current loads, and is equal to the in the air-fuel ratio of first air cylinder group
One default air-fuel ratio.
Beneficial effects of the present invention: the control method of engine exhaust temperature elevation system provided by the invention, by increasing the
The connection aperture of the air inlet of the exhaust outlet and air cylinder group of two air cylinder groups can be followed EGR is used in the exhaust of the second air cylinder group
The air capacity of ring increases, and in the case that total air inflow is constant, will reduce into the cold air amount in air cylinder group, make air cylinder group
Intake air temperature increases, then the delivery temperature of air cylinder group will correspondingly increased, then increase exhaust gas post-treatment device into
Temperature degree makes the intake air temperature of exhaust gas post-treatment device meet the fuel oil jet strip of the requirement of SCR initiation temperature and DPF initiative regeneration
Part.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the engine exhaust temperature elevation system that the embodiment of the present invention one provides；
Fig. 2 is the flow chart one of the control method for the engine exhaust temperature elevation system that the embodiment of the present invention one provides；
Fig. 3 is the flowchart 2 of the control method for the engine exhaust temperature elevation system that the embodiment of the present invention one provides；
Fig. 4 is the structural schematic diagram of engine exhaust temperature elevation system provided by Embodiment 2 of the present invention.
In figure:
1, the first air cylinder group；2, the second air cylinder group；3, exhaust manifold；4, first exhaust pipeline；5, second exhaust pipeline；6,
Third gas exhaust piping；7, exhaust cycle pipeline；8, intake-air throttle valve；9, exhaust regulating valve；10, exhaust cycle regulating valve；11, whirlpool
Turbine；12, exhaust cycle cooler；13, inlet manifold；14, compressor；15, air intake intercooler；16, adjustable control valve.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
In conjunction with attached drawing and pass through specific embodiment to further illustrate the technical scheme of the present invention.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing and it is not all.
Embodiment one
Fig. 1 is the structural schematic diagram of engine exhaust temperature elevation system provided in this embodiment, as shown in Figure 1, the present embodiment
Provide a kind of control method of engine exhaust temperature elevation system, wherein engine include air cylinder group, exhaust gas post-treatment device and
Control valve group, wherein air cylinder group includes the first air cylinder group 1 and the second air cylinder group 2 connected in parallel, the first air cylinder group 1 and the second gas
The number of cylinders that cylinder group 2 includes can be 1,2,3 or more, include extremely in the first air cylinder group 1 or the second air cylinder group 2
When few two cylinders, at least two cylinders are arranged in parallel.In the present embodiment, the first air cylinder group 1 and the second air cylinder group 2 include being
Three cylinders.
Exhaust outlet in first air cylinder group 1 is connected to the air inlet of exhaust gas post-treatment device.Specifically, the first air cylinder group 1
In the exhaust outlet of each cylinder be all connected with an exhaust manifold 3, each exhaust manifold 3 connects with one end of second exhaust pipeline 5
Logical, the other end of second exhaust pipeline 5 is connected to the air inlet of turbine 11, after the exhaust outlet of turbine 11 is connected to exhaust
Manage the air inlet of device.
The exhaust outlet of each cylinder is all connected with an exhaust manifold 3 in second air cylinder group 2, and each exhaust manifold 3 is with
One end of three gas exhaust pipings 6 is connected to.The other end of third gas exhaust piping 6 passes through the air inlet of exhaust cycle pipeline 7 and air cylinder group
Connection, exhaust cycle pipeline 7 are equipped with exhaust cycle cooler 12, the gas of each cylinder discharge in the second air cylinder group 2
It is cooled down, and gas after cooling is sent into air cylinder group and is recycled again, to reduce the gas of air cylinder group discharge
The content of middle nitrogen oxides.The other end of third gas exhaust piping 6 also passes through first exhaust pipeline 4 and the air inlet of turbine 11 connects
It is logical.
In other embodiments, first exhaust pipeline 4 can also be connected to second exhaust pipeline 5, pass through second exhaust
Pipeline 5 makes the air inlet of third gas exhaust piping 6 Yu turbine 11.
When engine is run under middle-low load working condition, the delivery temperature of engine is lower, illustrates to be sent into exhaust aftertreatment
Gas temperature in device is too low, is unable to satisfy the fuel oil injection conditions of the requirement of SCR initiation temperature and DPF initiative regeneration.For this purpose,
The present embodiment is adjusted the delivery temperature of air cylinder group by the cooperation of control valve group, intake-air throttle valve 8 and fuel injection assemblies
To adjust the intake air temperature of exhaust aftertreatment.Wherein, control valve group control the second air cylinder group 2 exhaust outlet selectively with exhaust
The air inlet of after-treatment device and/or the air inlet connection of air cylinder group, and after the exhaust outlet of the second air cylinder group 2 of adjusting and exhaust
Manage the connection aperture of the air inlet of the connection aperture of the air inlet of device and the exhaust outlet and air cylinder group of the second air cylinder group 2；Combustion
Expect that injection control component adjusts the fuel quantity in the first air cylinder group 1 and the second air cylinder group 2；Intake-air throttle valve 8 is set to air cylinder group
Air inlet, for adjusting the air inflow of air cylinder group.By the adjusting to control valve group, fuel quantity and air inflow, make air cylinder group
Delivery temperature increase, increases the intake air temperature of exhaust gas post-treatment device, thus make feeding after-treatment device in gas
Temperature meets the fuel oil injection conditions of the requirement of SCR initiation temperature and DPF initiative regeneration.
In the present embodiment, control valve group includes exhaust regulating valve 9 and exhaust cycle regulating valve 10, wherein exhaust regulating valve
9, it is set on first exhaust pipeline 4, exhaust regulating valve 9 is used to adjust the exhaust outlet and exhaust gas post-treatment device of the second air cylinder group 2
Air inlet connection aperture；Exhaust cycle regulating valve 10 is set on exhaust cycle pipeline 7 and in parallel with exhaust regulating valve 9 sets
It sets, exhaust cycle regulating valve 10 can adjust the connection aperture of the exhaust outlet of the second air cylinder group 2 and the air inlet of air cylinder group.Pass through
The gas of exhaust regulating valve 9 and the discharge of 10 the second air cylinder group of co- controlling 2 of exhaust cycle regulating valve, by 2 row of the second air cylinder group
The gas put is sent into air cylinder group and is recycled, and/or is sent into exhaust gas post-treatment device.
Further, the air inlet of air cylinder group is equipped with the inlet manifold 13 being connected to exhaust cycle pipeline 7, intake-air throttle valve
8 are set on inlet manifold 13.Inlet manifold 13 is equipped with the pressure for being located at and intake-air throttle valve 8 upstream and setting gradually along airflow direction
Mechanism of qi 14 and air intake intercooler 15.Above-mentioned compressor 14 and the coaxially connected formation turbocharger of turbine 11.
Further, turbocharger can only have a runner, it is possible to have two equal-sized symmetrical turbines
Runner, it is possible to have the unequal Asymmetric Vortex wheel runner of two sizes.There is asymmetric double turbine flow in turbocharger
When road, one end of second exhaust pipeline 5 is connected to the big runner in the asymmetric double turbine runner of turbocharger, first exhaust
One end of pipeline 4 is connected to small runner in the asymmetric double turbine runner of turbocharger.There is symmetric double in turbocharger
When turbine runner, first exhaust pipeline 4 and second exhaust pipeline 5 are connected to from different turbine runners respectively.
The control method of above-mentioned engine exhaust temperature elevation system includes mainly four kinds of situations, the first is worked as in engine
Preload is less than the first default load；It is for second that engine current loads are more than or equal to the first default load and are less than or equal to the
Two default loads；The third is that engine current loads are greater than the second default load；4th kind is that engine is in cold start-up work
Condition.Above four kinds of situations are specifically introduced separately below.
Engine current loads are arranged in a one-to-one correspondence with total fuel quantity, in the case where engine current loads determine, always
Fuel quantity is also constant.
Fig. 2 is the flow chart one of the control method of engine exhaust temperature elevation system provided in this embodiment, as shown in Fig. 2,
When engine current loads are less than the first default load, the control method of above-mentioned engine exhaust temperature elevation system includes following step
It is rapid:
S11, when current loads are less than the first default load, obtain the intake air temperature of exhaust gas post-treatment device.
S12, whether judge the intake air temperature of exhaust gas post-treatment device less than the first preset temperature, if so, execute S13,
If it is not, then keeping current state.
When the intake air temperature of exhaust gas post-treatment device is less than the first preset temperature, it will be unable to meet SCR initiation temperature and want
The fuel oil injection conditions of summation DPF initiative regeneration passes through the company of the air inlet of the exhaust outlet and air cylinder group that increase the second air cylinder group 2
Degree of opening up can increase the air capacity that EGR circulation is used in the exhaust of the second air cylinder group 2, in the case that total air inflow is constant,
It will be reduced into the cold air amount in air cylinder group, increase the intake air temperature of air cylinder group, then will correspondingly make air cylinder group
Delivery temperature increase, then increase the intake air temperature of exhaust gas post-treatment device, keep the intake air temperature of exhaust gas post-treatment device full
Sufficient SCR initiation temperature requires and the fuel oil injection conditions of DPF initiative regeneration.
Whether the connection aperture of the air inlet of S13, the exhaust outlet for judging the second air cylinder group 2 and air cylinder group is maximum opening,
If so, executing S14, if it is not, then increasing the connection aperture of the exhaust outlet of the second air cylinder group 2 and the air inlet of air cylinder group, and return
Return S12.
When the connection aperture of the air inlet of the exhaust outlet and air cylinder group of the second air cylinder group 2 is not up to maximum, if after exhaust
The intake air temperature of processing unit is greater than the first preset temperature, then can pass through the exhaust outlet and air cylinder group of the second air cylinder group 2 of increase
Air inlet connection aperture, increase the second air cylinder group 2 and be used for the capacity that is again introduced into air cylinder group, to improve air cylinder group
Intake air temperature increases the delivery temperature of the first air cylinder group 1.
The connection aperture of the air inlet of S14, the exhaust outlet for judging the second air cylinder group 2 and exhaust gas post-treatment device whether be
Zero, if so, executing S15；If it is not, then reducing the company of the exhaust outlet of the second air cylinder group 2 and the air inlet of exhaust gas post-treatment device
Degree of opening up, and return to S12；
S15, judge whether the air-fuel ratio of the first air cylinder group 1 is equal to the first default air-fuel ratio, if so, by the first air cylinder group
1 keeps the first default air-fuel ratio；If it is not, then executing S16.
The fuel quantity of S16, the aperture for adjusting intake-air throttle valve 8 and/or the first air cylinder group 1, make exhaust gas post-treatment device
Intake air temperature is more than or equal to the first preset temperature.
Wherein adjust intake-air throttle valve aperture specifically includes the following steps:
When the air-fuel ratio of the first air cylinder group 1 is less than the first default air-fuel ratio, reduce the first air cylinder group 1 fuel quantity and/
Or increase the aperture of intake-air throttle valve 8.Before the aperture for increasing intake-air throttle valve 8, it need to judge that the aperture of intake-air throttle valve 8 is
It is no to reach maximum, if so, the aperture of intake-air throttle valve 8 is kept maximum, if it is not, then increasing opening for intake-air throttle valve 8
Degree.When reducing the fuel quantity of the first air cylinder group, it need to judge whether the fuel quantity of the first air cylinder group is equal to zero, if so, by the
The fuel quantity of one air cylinder group keeps zero, if it is not, then reducing the fuel quantity of the first air cylinder group 1.
The first air cylinder group 1 air-fuel ratio be greater than the first default air-fuel ratio when, increase the first air cylinder group 1 fuel quantity and/
Or reduce the aperture of intake-air throttle valve 8.Before the fuel quantity for increasing the first air cylinder group 1, the fuel quantity of the first air cylinder group 1 is judged
Whether total fuel quantity corresponding with engine current loads is equal to, if so, the fuel quantity of the first air cylinder group 1 to be maintained at and send out
The corresponding total fuel quantity of motivation current loads, if it is not, then increasing the fuel quantity of the first air cylinder group 1.Due to engine operation
In the process, the aperture of intake-air throttle valve can not be zero, it is possible to directly reduce the aperture of intake-air throttle valve 8, but need to protect
The aperture for demonstrate,proving intake-air throttle valve 8 cannot be zero.
Output power in order to guarantee engine is constant, needs to be equal in total fuel quantity corresponding with engine current loads
Under the premise of total fuel quantity, the fuel quantity in the first air cylinder group 1 is equal to the fuel quantity in the second air cylinder group 2, therefore is adjusting the
When fuel quantity in one air cylinder group 1, while the fuel quantity in the second air cylinder group 2 will also change.
The step for S12 is returned in the other embodiment of the present invention, in above-mentioned steps S13, S14, can increase step
Judge that the intake air temperature of exhaust gas post-treatment device whether less than the first preset temperature, and simplifies the execution efficiency of program.
Engine can be made in the case where engine load is less than the first default load using the above method, to air cylinder group
Exhaust heat up, to improve the intake air temperature of exhaust gas post-treatment device, keep the gas temperature being sent into after-treatment device full
Sufficient SCR initiation temperature requires and the fuel oil injection conditions of DPF initiative regeneration, exhaust gas post-treatment device still can be transported efficiently
Row, and the harmful substance in the gas discharged by exhaust gas post-treatment device to air cylinder group is adequately handled.
In the case that engine current loads are greater than the second default load, it is believed that the air inlet temperature of exhaust gas post-treatment device at this time
Spend meet demand, the then exhaust of the connection aperture, the second air cylinder group 2 of the air inlet of the exhaust outlet and air cylinder group of the second air cylinder group 2
Mouthful with the fuel quantity of the connection aperture of the air inlet of exhaust gas post-treatment device, the aperture of intake-air throttle valve 8, the first air cylinder group 1 with
And second the fuel quantity of air cylinder group 2 remain unchanged.
Engine current loads are more than or equal to the first default load and are less than or equal under the operating condition of the second default load, are arranging
When the intake air temperature of gas after-treatment device is less than the first preset temperature, it is still necessary to improve the delivery temperature of air cylinder group.Fig. 3 is this reality
The flowchart 2 of the control method of the engine exhaust temperature elevation system of example offer is applied, as shown in figure 3, engine exhaust heats up at this time
The control method of system specifically comprises the following steps:
S21, engine current loads be more than or equal to the first default load and be less than or equal to the second default load when, obtain
The intake air temperature of exhaust gas post-treatment device.
S22, whether judge the intake air temperature of exhaust gas post-treatment device less than the first preset temperature, if so, execute S23,
If it is not, then keeping current state.
S23, judge whether the air-fuel ratio of the first air cylinder group 1 is equal to the first default air-fuel ratio, if so, by the first air cylinder group
1 keeps the first default air-fuel ratio, and executes S24；If it is not, then adjusting the fuel quantity and/or intake-air throttle valve 8 of the first air cylinder group 1
Aperture, and return to S22.
When the air-fuel ratio of the first air cylinder group 1 is less than the first default air-fuel ratio, reduce the first air cylinder group 1 fuel quantity and/
Or increase the aperture of intake-air throttle valve 8；When the air-fuel ratio of the first air cylinder group 1 is greater than the first default air-fuel ratio, increase the first gas
The fuel quantity of cylinder group 1 and/or the aperture for reducing intake-air throttle valve 8.
Wherein, the premise for increasing the fuel quantity of the first air cylinder group 1 is that the fuel quantity of the first air cylinder group 1 is less than and engine
The corresponding total fuel quantity of current loads.The premise for increasing the aperture of intake-air throttle valve 8 is that the aperture of intake-air throttle valve 8 is less than it
Maximum opening.
S24, judge whether the air-fuel ratio of the second air cylinder group 2 is equal to the second default air-fuel ratio, if so, by the second air cylinder group
2 keep the second default fuel air ratio constant, if it is not, then adjusting the aperture of intake-air throttle valve 8, and execute S25.
S25, whether judge the intake air temperature of exhaust gas post-treatment device less than the first preset temperature, if so, return to S24,
If it is not, the air-fuel ratio of the second air cylinder group 2 is then kept current air fuel ratio.
Wherein, when the air-fuel ratio of the second air cylinder group 2 is less than the second default air-fuel ratio, increase the aperture of intake-air throttle valve 8；
When the air-fuel ratio of the second air cylinder group 2 is greater than the second default air-fuel ratio, reduce the aperture of intake-air throttle valve 8.
Wherein, the premise for increasing the aperture of intake-air throttle valve 8 is that the aperture of intake-air throttle valve 8 is less than its maximum opening.
Above-mentioned first default air-fuel ratio is that the delivery temperature of the first air cylinder group 1 is instigated to reach highest air capacity and fuel quantity
Ratio, the second default air-fuel ratio is the ratio for instigating the delivery temperature of the second air cylinder group 2 to reach highest air capacity and fuel quantity
Value.The specific value for determining the first default air-fuel ratio and the second default air-fuel ratio can be tested by being repeated several times.
The delivery temperature of exhaust gas post-treatment device can be further improved using the above method, it is not necessary to again to air cylinder group into
Row fuel post injection, solve because using fuel post injection Shi Yinqi timing node rearward, fuel may in air cylinder group by
It soaks and causes fuel that engine is made to generate mechanical problem because of oil dilution；The thermal efficiency of the fuel in air cylinder group is higher, drop
The low consumption of fuel.
Above-mentioned first preset temperature refers to the fuel oil injection conditions for meeting the requirement of SCR initiation temperature and DPF initiative regeneration
Exhaust aftertreatment intake air temperature.The specific value for determining the first preset temperature can be tested by being repeated several times.
Engine is in the case where being cold-started operating condition, and the connection of the air inlet of the exhaust outlet and air cylinder group of the second air cylinder group 2 is opened
Degree is maximum, and the connection aperture of the air inlet of the exhaust outlet and exhaust gas post-treatment device of the second air cylinder group 2 is zero, and the first cylinder
Fuel quantity in group 1 is equal to total fuel quantity corresponding with engine current loads, and is equal to the in the air-fuel ratio of the first air cylinder group 1
One default air-fuel ratio.
The present embodiment is cooperated by exhaust regulating valve 9 and exhaust cycle regulating valve 10, and association control is by exhaust cycle pipeline 7
The gas flow being sent into air cylinder group, and the gas flow in exhaust gas post-treatment device is sent by first exhaust pipeline 4.It is followed in exhaust
When ring regulating valve 10 completely closes, exhaust regulating valve 9 is opened, and engine EGR rate is 0 at this time, is beaten in exhaust cycle regulating valve 10
It opens, when exhaust regulating valve 9 completely closes, engine EGR rate 50% realizes the capacity for being used to recycle to air cylinder group
It adjusts, realizes the flexible modulation between 0-50% of the EGR rate under all operating conditions of engine.
Embodiment two
Fig. 4 is the structural schematic diagram of engine exhaust temperature elevation system provided in this embodiment, as shown in figure 4, the present embodiment
Difference with embodiment one is that control valve group is adjustable control valve 16, the air inlet of adjustable control valve 16 and the second air cylinder group 2
Exhaust outlet connection, two exhaust outlets of adjustable control valve 16 respectively with the air inlet of exhaust gas post-treatment device and air cylinder group into
Port connection；Adjust the exhaust outlet of the second air cylinder group 2 and the air inlet of exhaust gas post-treatment device simultaneously using adjustable control valve 16
Connection aperture and the second air cylinder group 2 exhaust outlet and air cylinder group air inlet connection aperture.
When the connection aperture of the air inlet of the exhaust outlet and air cylinder group of the second air cylinder group 2 reduces, the row of the second air cylinder group 2
The connection aperture of the air inlet of port and exhaust gas post-treatment device increases；The second air cylinder group 2 exhaust outlet and air cylinder group into
When the connection aperture of port increases, the connection aperture of the air inlet of the exhaust outlet and exhaust gas post-treatment device of the second air cylinder group 2 subtracts
It is small.
Preferably, when the connection aperture of the air inlet of the exhaust outlet and air cylinder group of the second air cylinder group 2 is zero, the second cylinder
The connection aperture of the air inlet of the exhaust outlet and exhaust gas post-treatment device of group 2 is maximum；In the exhaust outlet and cylinder of the second air cylinder group 2
When the connection aperture maximum of the air inlet of group, the connection of the air inlet of the exhaust outlet and exhaust gas post-treatment device of the second air cylinder group 2
Aperture is zero.
When needing to increase the intake air temperature for entering exhaust gas post-treatment device, increase the exhaust outlet and gas of the second air cylinder group 2
The connection aperture of the air inlet of cylinder group reduces the connection of the exhaust outlet of the second air cylinder group 2 and the air inlet of exhaust gas post-treatment device
Aperture.
Obviously, the above embodiment of the present invention is just for the sake of clearly illustrating examples made by the present invention, and being not is pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ", only
For descriptive purposes, it is not understood to indicate or imply relative importance.Wherein, term " first position " and " second position "
For two different positions.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Claims (10)
1. a kind of control method of engine exhaust temperature elevation system, which is characterized in that after engine includes air cylinder group and is vented
Device is managed, the air cylinder group includes the second air cylinder group (2) of the first air cylinder group (1) and setting connected in parallel；First cylinder
The exhaust outlet of group (1) is connected to the air inlet of the exhaust gas post-treatment device；The exhaust outlet selectivity of second air cylinder group (2)
Ground is connected to the air inlet of the air inlet of the exhaust gas post-treatment device and/or the air cylinder group；
When the intake air temperature of the exhaust gas post-treatment device is less than the first preset temperature, increase second air cylinder group (2)
The connection aperture of the air inlet of exhaust outlet and the air cylinder group makes the intake air temperature of the exhaust gas post-treatment device be more than or equal to the
One preset temperature.
2. the control method of engine exhaust temperature elevation system according to claim 1, which is characterized in that in second gas
When the connection aperture maximum of the air inlet of the exhaust outlet and air cylinder group of cylinder group (2), if the exhaust gas post-treatment device into
Temperature degree then reduces the exhaust outlet and the exhaust gas post-treatment device of second air cylinder group (2) still less than the first preset temperature
Air inlet connection aperture, make the exhaust gas post-treatment device intake air temperature be more than or equal to the first preset temperature.
3. the control method of engine exhaust temperature elevation system according to claim 2, which is characterized in that reducing described the
While the connection aperture of the air inlet of the exhaust outlet and exhaust gas post-treatment device of two air cylinder groups (2), reduce described second
Fuel quantity in air cylinder group (2) increases under the premise of total fuel quantity is equal to total fuel quantity corresponding with engine current loads
Fuel quantity in first air cylinder group (1).
4. the control method of engine exhaust temperature elevation system according to claim 3, which is characterized in that in first gas
When fuel quantity in cylinder group (1) reaches total fuel quantity, if the intake air temperature of the exhaust gas post-treatment device is default still less than first
Temperature, then adjust be set to the air cylinder group air inlet intake-air throttle valve (8) aperture, make the exhaust gas post-treatment device into
Temperature degree is more than or equal to the first preset temperature.
5. the control method of engine exhaust temperature elevation system according to claim 4, which is characterized in that in first gas
The air-fuel ratio of cylinder group (1) is equal to the first default air-fuel ratio, then first air cylinder group (1) is kept the first default air-fuel ratio.
6. the control method of engine exhaust temperature elevation system according to claim 5, which is characterized in that increasing described the
Before the connection aperture of the air inlet of the exhaust outlet and air cylinder group of two air cylinder groups (2), further includes:
Obtain engine current loads；
When engine current loads are less than the first default load, increase the exhaust outlet and the gas of second air cylinder group (2)
The connection aperture of the air inlet of cylinder group.
7. the control method of engine exhaust temperature elevation system according to claim 6, which is characterized in that current in engine
Load is greater than the first default load and when less than the second default load, if the intake air temperature of the exhaust gas post-treatment device is less than the
One preset temperature, the then air-fuel ratio for adjusting first air cylinder group (1) make it equal to the first default air-fuel ratio.
8. the control method of engine exhaust temperature elevation system according to claim 7, which is characterized in that in first gas
When the air-fuel ratio of cylinder group (1) is less than the first default air-fuel ratio, reduce fuel quantity and/or the increasing of first air cylinder group (1)
The aperture of the big intake-air throttle valve (8)；
When the air-fuel ratio of first air cylinder group (1) is greater than the first default air-fuel ratio, increase first air cylinder group (1)
Fuel quantity and/or reduce the aperture of the intake-air throttle valve (8).
9. the control method of engine exhaust temperature elevation system according to claim 7, which is characterized in that in first gas
The air-fuel ratio of cylinder group (1) be equal to the first default air-fuel ratio when, if the intake air temperature of the exhaust gas post-treatment device still less than
The air-fuel ratio of first air cylinder group (1) is then kept the first default air-fuel ratio, and adjusts institute by first preset temperature
The air-fuel ratio for stating the second air cylinder group (2) makes it equal to the second default air-fuel ratio.
10. the control method of engine exhaust temperature elevation system according to claim 1, which is characterized in that engine is in
In the case where being cold-started operating condition, the connection aperture of the air inlet of the exhaust outlet and air cylinder group of second air cylinder group (2) is maximum, and
The connection aperture of the air inlet of the exhaust outlet and exhaust gas post-treatment device of second air cylinder group (2) is zero, and described
Fuel quantity in one air cylinder group (1) is equal to total fuel quantity corresponding with engine current loads, and in first air cylinder group (1)
Air-fuel ratio be equal to the first default air-fuel ratio.
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| CN201910778248.3A CN110529270A (en) | 2019-08-22 | 2019-08-22 | A kind of control method of engine exhaust temperature elevation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110985474A (en) * | 2019-12-30 | 2020-04-10 | 三一重机有限公司 | Hydraulic control system and control method for engineering machinery and engineering machinery |
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Application publication date: 20191203 |