CN105443272B - Combustion engine low temp burning Smaller load stable combusting device and method - Google Patents
Combustion engine low temp burning Smaller load stable combusting device and method Download PDFInfo
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- CN105443272B CN105443272B CN201510854265.2A CN201510854265A CN105443272B CN 105443272 B CN105443272 B CN 105443272B CN 201510854265 A CN201510854265 A CN 201510854265A CN 105443272 B CN105443272 B CN 105443272B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses the stable combustion method of combustion engine low temp burning Smaller load, it comprises the following steps：In engine operation process, ECU reads the temperature signal for the temperature sensor being arranged on inlet manifold, when the intake air temperature of engine is less than the set temperature value of ECU, ECU is successively to high pressure exhaust gas recirculation by-pass valve, low pressure exhaust gas recirculation by-pass valve, intercooler bypass valve, gas storage pot valve untill meeting design temperature.The present invention ensures that intake air temperature high efficiency smart is adjustable.
Description
Technical field
The present invention relates to field of internal combustion engine, more particularly to a kind of combustion engine low temp burning Smaller load stable combusting device and side
Method.
Background technology
" homogeneity compression-ignition, low-temperature burning " theory is considered as that most potential high-efficiency cleaning internal combustion engine substitutes combustion technology,
So as to more and more be paid attention to.But the combustion process of this combustion system is mainly by Chemical Kinetics control.It
Ignition timing and combustion rate control it is difficult；And this combustion system operating condition narrow scope, gaseous mixture is excessively dilute
Or antiknock gasoline under Smaller load and idling operation easy " catching fire ", and then easily occur " pinking under high load working condition
Burning " (especially high-cetane fuel), therefore its operating condition scope need to big load and small load condition extension.This
Outside, in this combustion system, waste gas recycling (EGR) turns into most important Combustion System means, higher octane in combustion process
Be worth fuel requirement by residual gas improve gaseous mixture temperature can pressuring combustion ignition, and high-cetane fuel then needs
Using outside cooling exhaust gas dilution reduction combustion velocity, and the dilution of waste gas can reduce combustion flame temperature, so that
Suppress NOx generations.
In order to avoid in idling and small load condition, in-cylinder combustion temperature is relatively low, is hardly formed stable involuntary ignition bar
Hcci engine catches fire the generation of phenomenon under part.EGR Technology can be used, traditional method is to use changeable air valve
Technology, allows hot waste gas directly to stay in cylinder, improves intake air temperature, so as to improve burning, this method is referred to as internal EGR.But
The hot waste gas introduced in this way is, it is necessary to which the changeable air valve technology of complexity, is based especially on large driving force the need for diesel engine
Variable valve actuator for air it is more complicated, not yet have the report of Commercialization application.On the other hand, will for conventional external EGR methods
Air inlet pipe is incorporated into after waste gas cooling, to control combustion rate higher under " homogeneity compression-ignition, low-temperature burning " big load
Or the extension Fuel air mixing time, but its drawback is that the final intake air temperature of formation is unadjustable, it is impossible to hair is met well
The requirement of the stable burning of motivation Smaller load.
The content of the invention
It is an object of the invention to overcome the shortcomings of prior art, there is provided the air inlet that a kind of raising eventually enters into inlet manifold
The adjustable combustion engine low temp burning Smaller load stable combusting device of temperature, guarantee intake air temperature high efficiency smart and method.
In order to achieve the above object, the technical solution adopted by the present invention is：
The combustion engine low temp burning Smaller load stable combusting device of the present invention, it includes entering for being connected with engine intake
Gas house steward and the exhaust main being connected with engine exhaust port, air intake duct are sequentially connected with air cleaner, compressor, air inlet
In cold control system and inlet manifold, cold control system is bypassed by the charge air cooler and charge air cooler that are arranged in parallel in described air inlet
Valve group is into first pipeline one end is connected with exhaust main and the other end is sequentially connected with high pressure exhaust gas recirculation control system, list
To valve and inlet manifold, described high pressure exhaust gas recirculation control system is by the high pressure exhaust gas recycle cooler that is arranged in parallel
With high pressure exhaust gas recirculation by-pass valve group into the described axle of compressor and the axle of turbine is fixedly linked, described exhaust main
Outlet be connected with the air inlet of turbine, the gas outlet of described turbine is connected with two branch roads, and wherein tie point is provided with
Exhaust backpressure valve and the branch way outlet and atmosphere, the other end of the second branch road are sequentially connected with low pressure exhaust gas recycling control
System and air intake duct, described low pressure exhaust gas recirculation control system is by the low pressure exhaust gas recycle cooler that is arranged in parallel
With low pressure exhaust gas recirculation by-pass valve group into, second pipeline one end connection tie point port of export and the other end be sequentially connected with into
Mouth check valve, air accumulator, Outlet check valves, gas storage pot valve and inlet manifold, temperature is provided with described inlet manifold
Sensor, ECU respectively with intercooler bypass valve, high pressure exhaust gas recirculation by-pass valve, low pressure exhaust gas recirculation by-pass valve and
Gas storage pot valve is connected by control line.
The stable combustion method of combustion engine low temp burning Smaller load of the present invention, it comprises the following steps：
Step 1: in engine operation process, ECU reads the temperature sensor on inlet manifold
Temperature signal, when the intake air temperature of engine is less than the set temperature value of ECU, ECU is followed again to high pressure exhaust gas
Ring control system output control signal, it is 50% to open high pressure exhaust gas recirculation by-pass valve to aperture, makes the waste gas before turbine
High pressure exhaust gas recycle cooler is bypassed, then by check valve, imports inlet manifold；Set if detecting now intake air temperature and being higher than
Constant temperature degree, then high pressure exhaust gas recirculation by-pass valve aperture is sequentially reduced based on 50% aperture to 25%, 12.5%, 0, until
Untill meeting design temperature；If detect now intake air temperature be less than design temperature, high pressure exhaust gas recirculation by-pass valve with
Increase aperture based on 50% aperture successively to 75%, 87.5%, 100%, untill meeting design temperature；If high pressure exhaust gas
Recirculation by-pass valve opening increases to 100%, and intake air temperature still is below design temperature, then low pressure exhaust gas recirculation by-pass valve starts
Response；
Step 2: ECU sends instruction to low pressure exhaust gas recirculation control system, low pressure exhaust gas recycling is opened other
Port valve to aperture is 50%, the waste gas after turbine is bypassed low pressure exhaust gas recycle cooler, and compressor front end is imported afterwards；
If detecting now intake air temperature is higher than design temperature, low pressure exhaust gas recirculation by-pass valve is subtracted successively based on 50% aperture
Small guide vane is to 25%, 12.5%, 0, untill meeting design temperature；If detecting now intake air temperature is less than design temperature,
Then low pressure exhaust gas recirculation by-pass valve increased successively based on 50% aperture aperture to 75%, 87.5%, 100%, Zhi Daoman
Untill sufficient design temperature；If low pressure exhaust gas recirculation by-pass valve opening increases to 100%, intake air temperature still is below design temperature,
Then intercooler bypass valve is begun to respond to；
Step 3: ECU cold control system into air inlet sends instruction, opening intercooler bypass valve to aperture is
50%, the air inlet after compressor is bypassed charge air cooler, inlet manifold is imported afterwards；Set if detecting now intake air temperature and being higher than
Constant temperature degree, then intercooler bypass valve aperture is sequentially reduced based on 50% aperture to 25%, 12.5%, 0, until meeting setting
Untill temperature；If detect now intake air temperature be less than design temperature, intercooler bypass valve based on 50% aperture successively
Increase aperture to 75%, 87.5%, 100%, untill meeting design temperature；If intercooler bypass valve aperture increases to 100%,
Then gas storage pot valve is begun to respond to；
Step 4: ECU sends instruction to high-temp waste gas gas storage can system, it is 50% to open gas storage pot valve to aperture,
To introduce the high-temp waste gas in air accumulator to inlet manifold；If detecting now intake air temperature is higher than design temperature, air accumulator
Valve is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, untill meeting design temperature；If detecting this
When intake air temperature be less than design temperature, then gas storage pot valve increased successively based on 50% aperture aperture to 75%, 87.5%,
100% untill meeting design temperature.
Compared with prior art, the invention has the advantages that：
Firstth, cold control system and high-temp waste gas air accumulator in high pressure EGR control system, low pressure EGR control system, air inlet
System, can receive the instruction that ECU is sent, and response is sent according to the sequencing of priority, and raising eventually enters into inlet manifold's
Intake air temperature；Secondth, the by-passing valve in each control system follows dichotomy principle and performs command statement, it is ensured that intake air temperature is high
Effect intelligence is adjustable；Third and fourth control system does not interfere with each other autonomous working, and has widened intake air temperature domain；4th, the present apparatus
And method not only can ensure big load by introducing stable the burning of hot waste gas guarantee Smaller load, but also can cool down after waste gas
Stable conditions, it is often more important that more complicated variable valve actuator for air more simplifies and cheap.
Brief description of the drawings
Fig. 1 is the schematic diagram of the combustion engine low temp burning Smaller load stable combusting device of the present invention；
Fig. 2 is the control figure of the stable burning charge temperature control method of combustion engine low temp burning Smaller load of the present invention.
Embodiment
With reference to specific embodiment, the present invention will be described in detail.
The combustion engine low temp burning Smaller load stable combusting device of the present invention as shown in drawings, it includes entering with engine
The connected inlet manifold 3 of gas port and the exhaust main 4 being connected with engine exhaust port, air intake duct is sequentially connected with air-filtering
Cold control system and inlet manifold 3 in device 13, compressor 12, air inlet, cold control system is by being arranged in parallel in described air inlet
Charge air cooler 8 and intercooler bypass valve 9 constitute, first pipeline one end is connected with exhaust main 4 and the other end is sequentially connected with height
Waste gas and recycles control system, check valve 7 and inlet manifold 3 are pressed, described high pressure exhaust gas recirculation control system is by parallel connection
The high pressure exhaust gas recycle cooler 5 and high pressure exhaust gas recirculation by-pass valve 6 of setting are constituted, the axle of described compressor 12 and whirlpool
The axle of wheel 11 is fixedly linked, and the outlet of described exhaust main 4 is connected with the air inlet of turbine 11, the outlet of described turbine 11
Mouth is connected with two branch roads, and wherein tie point is provided with exhaust backpressure valve 10 and the branch way outlet and atmosphere, second
The other end of branch road is sequentially connected with low pressure exhaust gas recirculation control system and air intake duct, described low pressure exhaust gas recycling control
System processed is made up of the low pressure exhaust gas recycle cooler 14 and low pressure exhaust gas recirculation by-pass valve 15 being arranged in parallel, the second pipeline
One end connects the tie point port of export and the other end is sequentially connected with import check valve 17, air accumulator 18, Outlet check valves 19, storage
Gas tank valve 20 and inlet manifold 3, are provided with temperature sensor on described inlet manifold, and ECU 16 is cold with respectively
Device by-passing valve 9, high pressure exhaust gas recirculation by-pass valve 6, low pressure exhaust gas recirculation by-pass valve 15 and gas storage pot valve 20 pass through control line
It is connected.
The intake and exhaust flow direction of apparatus of the present invention is as illustrated by the arrows in fig. 1.Air passes through air cleaner 13, in pressure
Enter charge air cooler 8 and intercooler bypass valve 9 after being pressurized in mechanism of qi 12, then enter cylinder body 2 by inlet manifold 3；Engine is discharged
Waste gas, by exhaust main 4 produce a branch road flow to high pressure exhaust gas recycle cooler 5 and high pressure exhaust gas recirculation by-pass
Valve 6, by check valve 7, imports inlet manifold 3；The waste gas of another branch road of exhaust main 4 flows into turbine 11, is done work in turbine
After be divided into two-way, be discharged to all the way through exhaust backpressure valve 10 in air, another road enters low pressure exhaust gas recycle cooler 14 and low
Waste gas recirculation by-pass valve 15 is pressed, then imports the front end of compressor 12.The high-temp waste gas of the tie point port of export is unidirectional by import
Valve 17 is stored in air accumulator 18, then is imported by Outlet check valves 19 and gas storage pot valve 20 in inlet manifold.
It is illustrated in figure 2 based on dichotomy principle intake air temperature control figure, point four steps control intake air temperature.
The stable combustion method of combustion engine low temp burning Smaller load, it comprises the following steps：
Step 1: in engine operation process, ECU 16 reads the temperature sensor being arranged on inlet manifold
Temperature signal to monitor intake air temperature, when engine intake air temperature be less than ECU 16 set temperature value when, it is automatically controlled
Unit 16 is to high pressure exhaust gas recirculation control system output control signal, and opening high pressure exhaust gas recirculation by-pass valve 6 to aperture is
50%, the waste gas before making turbine 11 bypasses high pressure exhaust gas recycle cooler 5, so as to improve high pressure exhaust gas EGR gas temperature
Degree, then by check valve 7, import inlet manifold 3；If detecting now intake air temperature is higher than design temperature, high pressure exhaust gas is again
Circulation by-passing valve 6 is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, untill meeting design temperature；
If detect now intake air temperature be less than design temperature, high pressure exhaust gas recirculation by-pass valve 6 based on 50% aperture successively
Increase aperture to 75%, 87.5%, 100%, untill meeting design temperature；If the aperture of high pressure exhaust gas recirculation by-pass valve 6
100% is increased to, intake air temperature still is below design temperature, then low pressure exhaust gas recirculation by-pass valve 15 is begun to respond to；
Step 2: ECU 16 sends instruction to low pressure exhaust gas recirculation control system, low pressure exhaust gas recycling is opened
By-passing valve 15 to aperture is 50%, the waste gas after turbine 11 is bypassed low pressure exhaust gas recycle cooler 14, so as to improve low
Waste gas EGR gas temperature is pressed, the front end of compressor 12 is imported afterwards；If detecting now intake air temperature is higher than design temperature,
Low pressure exhaust gas recirculation by-pass valve 15 is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, is set until meeting
Untill constant temperature degree；If detecting now intake air temperature is less than design temperature, low pressure exhaust gas recirculation by-pass valve 15 is opened with 50%
Increase aperture based on degree successively to 75%, 87.5%, 100%, untill meeting design temperature；If low pressure exhaust gas is recycled
The aperture of by-passing valve 15 increases to 100%, and intake air temperature still is below design temperature, then intercooler bypass valve 9 is begun to respond to；
Step 3: the cold control system into air inlet of ECU 16 sends instruction, opening intercooler bypass valve 9 to aperture is
50%, the air inlet after compressor 12 is bypassed charge air cooler 8, so as to improve the intake air temperature after compressor 12, import afterwards into
Gas house steward 3；If detect now intake air temperature be higher than design temperature, intercooler bypass valve 9 based on 50% aperture successively
Reduce aperture to 25%, 12.5%, 0, untill meeting design temperature；If it is warm less than setting to detect now intake air temperature
Spend, then intercooler bypass valve 9 increases aperture to 75%, 87.5%, 100% successively based on 50% aperture, is set until meeting
Untill constant temperature degree；If the aperture of intercooler bypass valve 9 increases to 100%, gas storage pot valve 20 is begun to respond to；
Step 4: ECU sends instruction to high-temp waste gas gas storage can system, opening gas storage pot valve 20 to aperture is
50%, to introduce the high-temp waste gas in air accumulator 18 to inlet manifold 3；If detecting now intake air temperature is higher than design temperature,
Then gas storage pot valve 20 is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, untill meeting design temperature；
If detecting now intake air temperature is less than design temperature, gas storage pot valve 20 increases aperture extremely successively based on 50% aperture
75%th, 87.5%, 100% untill meeting design temperature.
It should be noted that apparatus of the present invention have widened intake air temperature domain, required intake air temperature is completely covered.
Embodiment 1
Step 1: in engine operation process, ECU 16 reads the temperature sensor being arranged on inlet manifold
Temperature signal, temperature is 25 DEG C, and the set temperature value of ECU 16 is 45 DEG C, and ECU 16 is recycled to high pressure exhaust gas
Control system output control signal, it is 50% to open high pressure exhaust gas recirculation by-pass valve 6 to aperture, makes the waste gas before turbine 11
Bypass high pressure exhaust gas recycle cooler 5, so as to improve high pressure exhaust gas EGR gas temperature, then by check valve 7, import into
Gas house steward 3；It is 28 DEG C to detect now intake air temperature, high pressure exhaust gas recirculation by-pass valve 6 increase successively aperture to 75%,
87.5%th, after 100%, intake air temperature is detected again for 30 DEG C, then low pressure exhaust gas recirculation by-pass valve 15 is begun to respond to；
Step 2: ECU 16 sends instruction to low pressure exhaust gas recirculation control system, low pressure exhaust gas recycling is opened
By-passing valve 15 to aperture is 50%, the waste gas after turbine 11 is bypassed low pressure exhaust gas recycle cooler 14, so as to improve low
Waste gas EGR gas temperature is pressed, the front end of compressor 12 is imported afterwards；It is 33 DEG C to detect now intake air temperature, and low pressure exhaust gas is again
It is 35 DEG C that circulation by-passing valve 15 increase aperture to intake air temperature after 75%, 87.5%, 100%, is detected again successively, then in it is cold
Device by-passing valve 9 is begun to respond to；
Step 3: the cold control system into air inlet of ECU 16 sends instruction, opening intercooler bypass valve 9 to aperture is
50%, the air inlet after compressor 12 is bypassed charge air cooler 8, so as to improve the intake air temperature after compressor 12, import afterwards into
Gas house steward 3；It is 38 DEG C to detect now intake air temperature, and intercooler bypass valve 9 increases aperture to 75%, 87.5%, 100% successively
Afterwards, intake air temperature is detected again for 40 DEG C, then gas storage pot valve 20 is begun to respond to；
Step 4: ECU sends instruction to high-temp waste gas gas storage can system, opening gas storage pot valve 20 to aperture is
50%, to introduce the high-temp waste gas in air accumulator 18 to inlet manifold 3；It is 43 DEG C, gas storage pot valve to detect now intake air temperature
20 increase apertures to after 87.5%, detecting that intake air temperature is 45 DEG C, meets 45 DEG C of design temperature again.So far it is former based on dichotomy
Reason intake air temperature control flow terminates.
--- by detection, temperature control equipment of the invention and method can improve intake air temperature to setting value, meet
Combustion engine low temp burning stable burning in idling and Smaller load.
Claims (2)
- The Smaller load stable combusting device 1. combustion engine low temp burns, it is characterised in that:It includes what is be connected with engine intake Inlet manifold and the exhaust main being connected with engine exhaust port, air intake duct are sequentially connected with air cleaner, compressor, entered Cold control system and inlet manifold in gas, cold control system is by the charge air cooler and charge air cooler being arranged in parallel in described air inlet Port valve constitute, first pipeline one end is connected with exhaust main and the other end be sequentially connected with high pressure exhaust gas recirculation control system, Check valve and inlet manifold, described high pressure exhaust gas recirculation control system is recycled by the high pressure exhaust gas being arranged in parallel to be cooled down Device and high pressure exhaust gas recirculation by-pass valve group are into the described axle of compressor and the axle of turbine is fixedly linked, and described exhaust is total The outlet of pipe is connected with the air inlet of turbine, and the gas outlet of described turbine is connected with two branch roads, and wherein tie point is installed There are exhaust backpressure valve and the branch way outlet and atmosphere, the other end of the second branch road is sequentially connected with low pressure exhaust gas recycling control System processed and air intake duct, described low pressure exhaust gas recirculation control system is recycled by the low pressure exhaust gas being arranged in parallel to be cooled down Device and low pressure exhaust gas recirculation by-pass valve group are into second pipeline one end connects the tie point port of export and the other end is sequentially connected with Import check valve, air accumulator, Outlet check valves, gas storage pot valve and inlet manifold, temperature is provided with described inlet manifold Spend sensor, ECU respectively with intercooler bypass valve, high pressure exhaust gas recirculation by-pass valve, low pressure exhaust gas recirculation by-pass valve It is connected with gas storage pot valve by control line.
- 2. the stable combustion method of combustion engine low temp burning Smaller load, it is characterised in that it comprises the following steps：Step 1: in engine operation process, ECU reads the temperature for the temperature sensor being arranged on inlet manifold Signal, when the intake air temperature of engine is less than the set temperature value of ECU, ECU is recycled to high pressure exhaust gas and controlled System output control signal processed, it is 50% to open high pressure exhaust gas recirculation by-pass valve to aperture, bypasses the waste gas before turbine High pressure exhaust gas recycle cooler, then by check valve, import inlet manifold；If it is warm higher than setting to detect now intake air temperature Spend, then high pressure exhaust gas recirculation by-pass valve is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, until meeting Untill design temperature；If detecting now intake air temperature is less than design temperature, high pressure exhaust gas recirculation by-pass valve is opened with 50% Increase aperture based on degree successively to 75%, 87.5%, 100%, untill meeting design temperature；If high pressure exhaust gas is recycled Bypass valve opening increases to 100%, and intake air temperature still is below design temperature, then low pressure exhaust gas recirculation by-pass valve is begun to respond to；Step 2: ECU sends instruction to low pressure exhaust gas recirculation control system, low pressure exhaust gas recirculation by-pass valve is opened It is 50% to aperture, the waste gas after turbine is bypassed low pressure exhaust gas recycle cooler, compressor front end is imported afterwards；If inspection Measure now intake air temperature and be higher than design temperature, then low pressure exhaust gas recirculation by-pass valve is sequentially reduced out based on 50% aperture Degree is to 25%, 12.5%, 0, untill meeting design temperature；If detecting now intake air temperature is less than design temperature, low Pressure waste gas recirculation by-pass valve increases aperture to 75%, 87.5%, 100% successively based on 50% aperture, is set until meeting Untill constant temperature degree；If low pressure exhaust gas recirculation by-pass valve opening increases to 100%, intake air temperature still is below design temperature, then in Cooler by-passing valve is begun to respond to；Step 3: ECU cold control system into air inlet sends instruction, it is 50% to open intercooler bypass valve to aperture, is made Air inlet after compressor bypasses charge air cooler, and inlet manifold is imported afterwards；If detecting now intake air temperature is higher than design temperature, Then intercooler bypass valve is sequentially reduced aperture to 25%, 12.5%, 0 based on 50% aperture, is until meeting design temperature Only；If detecting now intake air temperature is less than design temperature, intercooler bypass valve based on 50% aperture open successively by increase Degree is to 75%, 87.5%, 100%, untill meeting design temperature；If intercooler bypass valve aperture increases to 100%, gas storage Pot valve is begun to respond to；Step 4: ECU sends instruction to high-temp waste gas gas storage can system, it is 50% to open gas storage pot valve to aperture, to draw Enter high-temp waste gas in air accumulator to inlet manifold；If detect now intake air temperature be higher than design temperature, gas storage pot valve with Aperture is sequentially reduced based on 50% aperture to 25%, 12.5%, 0, untill meeting design temperature；Now enter if detecting Temperature degree is less than design temperature, then gas storage pot valve increases aperture to 75%, 87.5%, 100% successively based on 50% aperture Untill meeting design temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110206641A (en) * | 2019-04-29 | 2019-09-06 | 天津大学 | Compression ignition engine and its method for realizing low temperature combustion mode |
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| CN108716433B (en) * | 2018-03-06 | 2020-09-11 | 广西玉柴机器股份有限公司 | Engine thermal management system and control method thereof |
| CN110685793A (en) * | 2019-09-26 | 2020-01-14 | 湖南行必达网联科技有限公司 | Intercooling bypass device, diesel engine air intake system, control method and vehicle |
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| CN112211717B (en) * | 2020-08-31 | 2022-08-19 | 东风商用车有限公司 | Multi-stage supercharging flexible air system with electric supercharging function for engine |
| CN112523877B (en) * | 2020-10-21 | 2022-08-30 | 广西玉柴机器股份有限公司 | Control method for high-pressure exhaust gas recirculation cooling bypass valve |
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| CN105443272A (en) | 2016-03-30 |
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