CN105508086B - A kind of exhaust gas recirculatioon constant-voltage equipment meeting high pressure engine self adaptive control and control method - Google Patents

A kind of exhaust gas recirculatioon constant-voltage equipment meeting high pressure engine self adaptive control and control method Download PDF

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Publication number
CN105508086B
CN105508086B CN201511006099.7A CN201511006099A CN105508086B CN 105508086 B CN105508086 B CN 105508086B CN 201511006099 A CN201511006099 A CN 201511006099A CN 105508086 B CN105508086 B CN 105508086B
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accumulator
exhaust
engine
pressure
constant
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CN105508086A (en
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王�忠
赵怀北
瞿磊
刘帅
赵洋
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Jiangsu University
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Jiangsu University
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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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/36—Control for minimising NOx emissions

Abstract

The present invention provides a kind of exhaust gas recirculatioon constant-voltage equipment for meeting high pressure engine self adaptive control and control methods, including setting gradually electric booster pump, cooler, accumulator and controller on the waste gas circulation access between enmgine exhaust and inlet manifold；The air inlet of accumulator is provided with breather check valve, and gas outlet is arranged exhaust valve, is equipped with energy storage pressure sensor in accumulator；Back pressure transducer is equipped between engine and exhaust manifold；Energy storage pressure sensor, back pressure transducer, electric booster pump, accumulator exhaust valve are connect with controller, and controller is connect with engine load sensor.Setting pressurization, energy storage equipment, maintain the pressure of exhaust gas constant in waste gas circulation pipeline, so that engine reduces NO with EGRxTechnology smoothly implement.Meanwhile by the aperture of self adaptive control accumulator exhaust valve and time, EGR rate is adjusted, meeting engine reduces NOxRequirement.

Description

A kind of exhaust gas recirculatioon constant-voltage equipment meeting high pressure engine self adaptive control And control method
Technical field
The present invention relates to engines exhaust gas recirculation technology, in particular to a kind of to meet high pressure engine self-adaptive controlled The exhaust gas recirculatioon constant-voltage equipment and control method of system.
Background technique
It is to reduce maximum combustion temperature and high temperature by reducing burning velocity that exhaust gas recirculatioon (EGR) is used in engine Duration, to destroy NOxHigh-temperature oxygen-enriched condition needed for generating, reduces the NO of enginexDischarge.EGR technology is Reduce NOxOne of effective measures to discharge pollutants, EGR technology is on middle-size and small-size vehicular engine using relatively broad at present.
Meanwhile the study found that when not taking other measures, NOxThere is tradeoff between exhaust particulate (PM) (trade-off) curved line relation.The increase of EGR rate influences the discharge of PM smaller under small engine load；And middle high load capacity The increase of lower EGR rate but makes PM amplification larger, needs to limit EGR rate.So by comprehensive analysis, when Smaller load can with compared with Big EGR rate, and centering high load capacity, then need to adjust EGR rate, limit EGR rate.
Currently, the technical measures that EGR is taken are, waste gas circulation is set between enmgine exhaust and inlet manifold Access sends a part of the exhaust gas of engine discharge back to cylinder again.Under middle high load capacity, pressure at expulsion and temperature are all larger, hold Easily enter cylinder under the control of EGR valve by circulation loop；And when Smaller load, pressure at expulsion and temperature are lower, are especially increasing High supercharging pressure level makes exhaust gas is more difficult to be passed through cylinder in hydraulic motor.So certain measure is taken to improve portion pressure, reduce In the case of high supercharging pressure level, the technical difficulty of waste gas stream air return cylinder, for reduce engine NOx discharge be there is an urgent need to.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of EGR for meeting high pressure engine self adaptive control is permanent Pressure device and control method reduce NO according to engine with supercharger workload suitable control EGR ratexDischarge.
The present invention achieves the above technical objects by the following technical means.
A kind of EGR constant-voltage equipment meeting high pressure engine self adaptive control, it is characterised in that: be included in engine Electric booster pump, cooler, accumulator, and control are set gradually on waste gas circulation access between exhaust manifold and inlet manifold Device processed；The accumulator is provided with breather check valve for storing exhaust gas and constant pressure, the air inlet of accumulator, and gas outlet is set Exhaust valve is set, is equipped with energy storage pressure sensor in accumulator；Exhaust pressure is equipped in pipeline between engine and exhaust manifold Force snesor；The energy storage pressure sensor, back pressure transducer, electric booster pump, accumulator exhaust valve with control Device connection, controller are connect with engine load sensor existing in intake channel, and the controller is according to energy storage pressure Sensor, back pressure transducer and engine load sensor output signal then control the start and stop of electric booster pump, store The opening and closing of exhaust valve is arranged in the breather check valve of energy device, gas outlet.
Further, the pipe diameter of the waste gas circulation access is 35~45mm.
Further, the volume of the accumulator is
mEG/(m1+mEG)=[ηEGR]
The equation of gas state: PEGV=(mEGRT/M)=nRT
Wherein: m1——For every circulation actual fresh charge；
mEG——For every cycle gas quality；
[ηEGR]-be maximum EGR rate in engine；
V-accumulator volume；
M-perfect gas molal weight；
N-substance amount；
R-gas constant；
PEGConstant exhaust gas pressure in-accumulator takes 1.3~1.5 times of atmospheric pressure.
Further, maximum EGR rate [η in engineEGR] take 40%.
Further, air-breathing turbine, the exhaust driven gas turbine of the electric booster pump are all made of heat-resisting material.
A kind of control method meeting high pressure engine self adaptive control EGR constant-voltage equipment, which is characterized in that The following steps are included:
(1) self adaptive control in accumulator: engine operation, electric booster pump bring into operation, and improve exhaust gas pressure, exhaust gas After into cooler for recycled exhaust gas temperature reduce, exhaust gas after cooling by cooler rear end pipeline by accumulator breather check valve into Enter accumulator, the PFE Exhaust Pressure Transducer real-time detection exhaust gas pressure being installed in accumulator, and exhaust gas pressure electric signal is defeated Out to controller, when exhaust gas pressure is lower than 1.3~1.5 atmospheric pressure, control unit controls electric booster pump operation；Work as exhaust gas When pressure reaches 1.3~1.5 atmospheric pressure, suspend electric booster pump；
(2) self adaptive control of accumulator exhaust valve: control unit combination throttle position sensor output signal and Engine operation condition signal is adjusted by the aperture and time parameter of accumulator exhaust valve under Smaller load in Experimental Calibration determination EGR rate is saved, accomplishes to reduce engine pollutant emission, improves engine power performance, specific manifestation are as follows: when using EGR skill For the engine of art when Smaller load is run, the increase of engine EGR rate is smaller on the discharge of PM influence, really according to Experimental Calibration institute Fixed accumulator exhaust valve opening and time parameter, using the EGR rate suitably increased；In engine under high load capacity, the increasing of EGR rate Add and but make PM amplification larger, so accumulator exhaust valve opening and time parameter determined by Experimental Calibration, control accumulation of energy Device exhaust valve opening reduces, and the time shortens, and the smaller EGR rate of use especially closes EGR under high load capacity.
NO is reduced using exhaust gas recirculatioon technology (EGR)xThe supercharged diesel engine and inner cylinder direct injection gasoline supercharging of discharge For machine when partial load condition is run, pressure at expulsion is lower, and after supercharging technology, the admission pressure in air inlet pipe is apparently higher than Exhaust gas pressure in EGR device causes the phenomenon that exhaust gas in EGR device is difficult to enter engine air inlet tube.In the present invention, electricity Dynamic booster pump is that responsiveness and controllability are good for improving exhaust gas pressure, feature, and maximum (top) speed is up to 50000r/min.It stores Energy device is for storing exhaust gas and constant pressure.Using accumulator, plays storage exhaust gas and constant exhaust gas pressure is 1.3~1.5 times Atmospheric pressure can smoothly enter into inlet manifold with the exhaust gas of 1.3~1.5 times of constant atmospheric pressure, mix with air into cylinder.Using Experimental Calibration method more accurately controls accumulator exhaust valve under different operating conditions according to engine operation condition by control unit Opening size and the time, adjust EGR rate, reduce NOx emission.
Setting pressurization, energy storage equipment, maintain the pressure of exhaust gas constant in waste gas circulation pipeline, so that engine is with useless Gas, which recycles (EGR), reduces NOxTechnology smoothly implement.Meanwhile by the aperture of self adaptive control accumulator exhaust valve and time, EGR rate is adjusted, meeting engine reduces NOxRequirement.
The PFE Exhaust Pressure Transducer being installed in accumulator plays self adaptive control for detecting exhaust gas pressure in accumulator Effect, i.e., in accumulator exhaust gas pressure be lower than required range when, by control unit control EGR electric booster pump operation；It stores When exhaust gas pressure reaches required range in energy device, control unit controls EGR electric booster pump operation suspension.It is transported by engine The signals such as row operating condition and throttle position sensor, the start-up time of EGR accumulator exhaust valve, and determined by Experimental Calibration method The aperture of EGR accumulator exhaust valve and opening time, adjust appropriate EGR rate.
Detailed description of the invention
Fig. 1 is the structure chart of the EGR constant-voltage equipment of the present invention for meeting high pressure engine self adaptive control.
Fig. 2 is self adaptive control flow chart of the invention.
Fig. 3 is the working principle of the invention flow chart.
In figure:
1-EGR admission line；2-EGR cooling liquid outlet；3-EGR cooler；4-EGR coolant inlet；5- accumulator into Gas check valve；6- energy storage pressure sensor；7- accumulator；8- accumulator exhaust valve；9- inlet manifold；10- engine；11- Back pressure transducer；The electronic EGR booster pump energization port 12-；13- exhaust manifold；14- exhaust gas processing device；15- booster pump Air-breathing turbine；The electronic EGR booster pump of 16-；17- booster pump exhaust driven gas turbine.
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, but protection scope of the present invention is simultaneously It is without being limited thereto.
As inscribed shown in 1, the exhaust gas recirculatioon constant pressure dress of the present invention for meeting high pressure engine self adaptive control It sets, it is characterised in that: electronic including being set gradually on the waste gas circulation access between enmgine exhaust and inlet manifold Booster pump 16, cooler 3, accumulator 7 and controller；The accumulator 7 is for storing exhaust gas and constant pressure, accumulator 7 Air inlet be provided with breather check valve 5, exhaust valve 8 is arranged in gas outlet, is equipped with energy storage pressure sensor 6 in accumulator 7；Hair Back pressure transducer 11 is equipped in pipeline between motivation and exhaust manifold；The energy storage pressure sensor 6, pressure at expulsion Sensor 11, electric booster pump 16, accumulator exhaust valve 8 are connect with controller, existing section in controller and intake channel The connection of valve opening sensor, the controller is according to energy storage pressure sensor 6, back pressure transducer 11 and air throttle Jaw opening sensor output signal then controls the breather check valve 5 of the start and stop of electric booster pump 16, accumulator 7, gas outlet setting The opening and closing of exhaust valve 8.
Air-breathing turbine 15, the exhaust driven gas turbine 17 of the electric booster pump 16 are all made of heat-resisting material.Booster pump is using electricity Machine driving, responsiveness and controllability are good, and the pressure of exhaust gas can be improved up to 50000r/min in maximum (top) speed.
Since by the way of pressurization, exhaust gas flow, pressure and flow velocity be increased, to reduce exhaust gas pressure decaying, institute Reduce by 6-10mm compared to the pipeline nowadays applied with the diameter of waste gas circulation pipeline in the device.The waste gas circulation is logical The pipe diameter on road is 35~45mm.
Accumulator, playing storage exhaust gas and constant exhaust gas pressure is 1.3~1.5 times of atmospheric pressure, with constant 1.3~1.5 The exhaust gas of times atmospheric pressure can smoothly enter into inlet manifold, mix with air into cylinder, accumulator volume is
The calculating of accumulator volume
When diesel engine is run under Smaller load, it can suitably increase EGR rate, maximum EGR rate is up to 40%.So with small The calculating of accumulator volume is carried out under load on the basis of maximum EGR rate 40%:
Total air mass m=actual fresh charge m1+ exhaust mass mEG
mEG/(m1+mEG)=[ηEGR]
Wherein: m1——For every circulation actual fresh charge
mEG——For every cycle gas quality
[ηEGR]-be maximum EGR rate in engine
The equation of gas state: PEGV=(mEGRT/M)=nRT
Wherein: V-accumulator volume；
M-perfect gas molal weight；
N-substance amount；
R-gas constant；
PEGConstant exhaust gas pressure in-accumulator takes 1.3~1.5 times of atmospheric pressure.
Engine 10 is run, and piston, intake and exhaust are working properly, and electric booster pump 16 starts running.Pressurized exhaust gas leads to Subcooler 3, is reduced exhaust gas temperature.Accumulator breather check valve 5 is opened, and exhaust gas is stored in accumulation of energy by circulation duct In device 7.The pressure sensor 6 being installed in accumulator detects exhaust gas pressure.Exhaust gas pressure reaches 1.3~1.5 times in accumulator When atmospheric pressure, control unit controls 16 operation suspension of EGR electric booster pump.Control unit is according to engine operation condition and solar term The signals such as door position sensor control accumulator exhaust valve opening and time, adjust EGR rate.It is embodied in, using EGR skill When Smaller load is run, control accumulator exhaust valve opening suitably increases the engine of art, and the opening time extends；It is high in engine Under load, suitable control accumulator exhaust valve opening suitably reduces, and the time suitably shortens, and especially closes EGR under high load capacity.Accumulation of energy Device exhaust valve 8 is opened, and pressurized exhaust gas can smoothly enter into inlet manifold, subsequently into cylinder.
As shown in Fig. 2, shown in Fig. 3, the control method of the constant-voltage equipment, specifically includes the following steps:
1) self adaptive control in accumulator: engine operation, electric booster pump 16 bring into operation, and improve exhaust gas pressure, give up Temperature reduces after gas enters cooler for recycled exhaust gas 3, and exhaust gas after cooling passes through accumulator breather check valve by cooler rear end pipeline 5 into accumulator 7, the 6 real-time detection exhaust gas pressure of PFE Exhaust Pressure Transducer being installed in accumulator 7, and exhaust gas pressure is electric Signal is exported to controller, and when exhaust gas pressure is lower than 1.3~1.5 atmospheric pressure, control unit controls electric booster pump 16 and transports Row；When exhaust gas pressure reaches 1.3~1.5 atmospheric pressure, suspend electric booster pump 16；
2) self adaptive control of accumulator exhaust valve: the signal and hair of control unit combination throttle position sensor output Motivation operating condition signal is adjusted by the aperture and time parameter of accumulator exhaust valve 8 under Smaller load in Experimental Calibration determination EGR rate accomplishes to reduce engine pollutant emission, improves engine power performance, specific manifestation are as follows: when using EGR technology Engine when Smaller load is run, the increase of engine EGR rate influences the discharge of PM smaller, is determined according to Experimental Calibration Accumulator exhaust valve opening and time parameter, using the EGR rate suitably increased；The increase of EGR rate but makes PM amplification larger, So accumulator exhaust valve opening and time parameter determined by Experimental Calibration, control accumulator exhaust valve opening reduces, when Between shorten, close EGR under the smaller EGR rate of use especially high load capacity.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement Or modification all belongs to the scope of protection of the present invention.

Claims (6)

1. a kind of exhaust gas recirculatioon constant-voltage equipment for meeting high pressure engine self adaptive control, it is characterised in that: be included in Electric booster pump (16), the cooler set gradually on waste gas circulation access between enmgine exhaust and inlet manifold (3), accumulator (7) and controller；The accumulator (7) is for storing exhaust gas and constant pressure, the air inlet of accumulator (7) Mouth is provided with breather check valve (5), gas outlet setting exhaust valve (8), is equipped with energy storage pressure sensor (6) in accumulator (7)； Back pressure transducer (11) are equipped in pipeline between engine and exhaust manifold；The energy storage pressure sensor (6), row Air pressure force snesor (11), electric booster pump (16), exhaust valve (8) are connect with controller, in controller and intake channel Engine load sensor connection, the controller according to energy storage pressure sensor (6), back pressure transducer (11) and Engine load sensor output signal then controls the breather check valve (5) of the start and stop of electric booster pump (16), accumulator (7) And the opening and closing of the exhaust valve (8) of gas outlet setting.
2. constant-voltage equipment according to claim 1, it is characterised in that: the pipe diameter of the waste gas circulation access be 35~ 45mm。
3. constant-voltage equipment according to claim 1, it is characterised in that: the volume of the accumulator (7) is
mEG/(m1+mEG)=[ηEGR]
The equation of gas state: PEGV=(mEGRT/M)=nRT
Wherein: m1It is every circulation actual fresh charge；
mEGIt is every cycle gas quality；
[ηEGR]-be maximum EGR rate in engine；
V-accumulator volume；
M-perfect gas molal weight；
N-substance amount；
R-gas constant；
PEGConstant exhaust gas pressure in-accumulator takes 1.3~1.5 times of atmospheric pressure.
4. constant-voltage equipment according to claim 2, it is characterised in that: maximum EGR rate [η in engineEGR] take 40%.
5. constant-voltage equipment according to claim 1, it is characterised in that: the air-breathing turbine of the electric booster pump (16) (15), exhaust driven gas turbine (17) is all made of heat-resisting material.
6. a kind of control method for meeting high pressure engine self adaptive control EGR constant-voltage equipment according to claim 1, Characterized by comprising the following steps:
(1) self adaptive control in accumulator: engine operation, electric booster pump (16) bring into operation, and improve exhaust gas pressure, exhaust gas Into cooler for recycled exhaust gas (3), temperature is reduced afterwards, and exhaust gas after cooling passes through accumulator breather check valve by cooler rear end pipeline (5) enter accumulator (7), PFE Exhaust Pressure Transducer (6) the real-time detection exhaust gas pressure being installed in accumulator (7), and will give up Air pressure force electrical signal is exported to controller, when exhaust gas pressure is lower than PEGWhen, controller controls electric booster pump (16) operation；When useless Atmospheric pressure reaches PEGWhen, suspend electric booster pump (16)；Wherein, constant exhaust gas pressure P in accumulatorEGIt takes 1.3~1.5 times big Air pressure；
(2) self adaptive control of exhaust valve (8): the signal of controller combination throttle position sensor output and engine operation Working condition signal, by Experimental Calibration determine under Smaller load exhaust valve (8) aperture and time parameter, EGR rate is adjusted, when starting Machine is when Smaller load is run, (8) aperture of the exhaust valve according to determined by Experimental Calibration and time parameter, using what is suitably increased EGR rate；In engine under high load capacity, (8) aperture of the exhaust valve determined by Experimental Calibration and time parameter control exhaust valve (8) aperture reduces, and the opening time of exhaust valve (8) shortens, the smaller EGR rate of use, closes EGR under high load capacity.
CN201511006099.7A 2015-12-29 2015-12-29 A kind of exhaust gas recirculatioon constant-voltage equipment meeting high pressure engine self adaptive control and control method Active CN105508086B (en)

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CN106644611A (en) * 2017-02-16 2017-05-10 大友（苏州）风洞技术有限公司 Discharge sampling tester of engine plateau simulation system
CN107559106A (en) * 2017-10-30 2018-01-09 潍柴动力股份有限公司 A kind of egr system and its mixed admission structure
CN110145417B (en) * 2019-06-28 2023-12-15 潍柴动力股份有限公司 Pressurizing device for improving EGR rate

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CN205445831U (en) * 2015-12-29 2016-08-10 江苏大学 Satisfy exhaust gas recirculatioon constant voltage equipment of high supercharging than engine adaptive control

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CN102996289A (en) * 2012-12-04 2013-03-27 哈尔滨工程大学 Supercharged diesel engine system based on EGR (exhaust gas recirculation) high pressure chamber
CN204255668U (en) * 2014-11-21 2015-04-08 江苏大学 The circulating device of simulated engine waste gas test cooler for recycled exhaust gas
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