CN202108613U - Waste gas circulation system for combustion engine - Google Patents
Waste gas circulation system for combustion engine Download PDFInfo
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- CN202108613U CN202108613U CN2011200692146U CN201120069214U CN202108613U CN 202108613 U CN202108613 U CN 202108613U CN 2011200692146 U CN2011200692146 U CN 2011200692146U CN 201120069214 U CN201120069214 U CN 201120069214U CN 202108613 U CN202108613 U CN 202108613U
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- gas circulation
- exhaust gas
- waste gas
- exhaust
- circulation canal
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model relates to a waste gas circulation system for a combustion engine, which comprises an exhausting channel (4), an gas inlet channel (22), a turbocharger (14) and a low voltage waste gas circulation channel (10). The low voltage waste gas circulation channel (10) is shunted at the down stream of a turbine (12) of the turbocharger (14) and accessed to the gas inlet channel (22) from the upper stream of a compressor (20) of the turbocharger (14). At present, how to adjust the waste gas circulation system with fewer equipment expenses is not disclosed so that a first waste gas mass flow sensor (24) is advised to be arranged in the low voltage waste gas circulation channel (10), and then mass flow of the waste gas in a low voltage branch can be directly determined.
Description
Technical field
The utility model relates to a kind of scheme for exhaust gas circulation system that is used for internal-combustion engine; It has exhaust passage and gas-entered passageway, turbosupercharger and low pressure exhaust gas circulation canal, and it feeds in the gas-entered passageway from the exhaust passage in the turbine downstream of turbosupercharger along separate routes and at the upstream of compressor of turbosupercharger.
Background technique
This system is well-known with turbo charged internal-combustion engine.Extraly, also known pure low pressure exhaust gas circulation is called the scheme for exhaust gas circulation system of double-circuit system.At this, especially the major component of waste gas circulates via low tension loop usually in diesel engine.Yet this shunt only has the very little pressure reduction that is used for waste gas circulation, and this pressure reduction should increase through the outlet valve in the waste gas branch road that extends.Yet, be difficult to realize high cycling rate, so high tension loop additionally is used for waste gas circulation.Especially this high tension loop is used for heating rapidly internal-combustion engine after cold start-up.
When the efficient of motor is desirable as far as possible, be difficult to be embodied as the adjusting that the best combustion parameter of adjustment is used to reduce the scheme for exhaust gas circulation system of harmful matter.Therefore use big quantity sensor, so as except inhaled air, also can to carry optimised quantity, from the waste gas of two waste gas circulation branch roads of firing chamber.Adjusting expends at this quite high and relevant with the characteristic family of storage at least, is confirmed the amount of cycle gas indirectly by this characteristic family.Yet this indirect definite federation causes inaccurate.
In order to be assigned to air and cycle gas in the internal-combustion engine as far as possible exactly; In DE 10 2,006,038 863 A1, advise, divide the upper reaches at crossing in gas-entered passageway, to arrange one first Air flow meter and in gas-entered passageway, arrange one second Air flow meter in the downstream, branch crossing of low pressure exhaust gas circulation canal and the upper reaches, branch crossing of high pressure exhaust gas circulation canal at the low pressure exhaust gas circulation canal.Should estimate and regulate the exhaust flow that gets in the exhaust gas recirculation passage by these two sensors.For this reason; Additionally use air inlet low voltage detector, pressure transducer, in the low pressure exhaust gas circulation canal, use exhaust elbow pressure transducer, pressure transducer and in gas-entered passageway, use the charge-air temperature prober at the upper reaches, branch crossing of high pressure exhaust gas circulation canal.Obtain a differential equation through various measurements and modeling, calculate the low pressure exhaust gas circular flow by this differential equation then.For this reason, utilize this result of calculation like this: air quantity and formed difference through recording are also confirmed the exhaust flow in the high tension loop.
This adjusting quite expends and needs very high instrument to expend.Extraly through various calculating and the characteristic family that is used to calculate exhausted air quantity produce inaccurate measurement result.Therefore,, both can confirm the pressure in the exhaust piping, also can estimate exhausted air quantity through pressure transducer for correct adjustment waste gas circulating valve.
The model utility content
Therefore; The utility model technical problem to be solved is; Create a kind of scheme for exhaust gas circulation system, can reduce the known result who is used for expending and can realizing better measurement and adjusting at the equipment of low pressure and double-circuit system adjusting and measurement cycle gas amount through this scheme for exhaust gas circulation system.
This technical problem promptly, is arranged the first exhaust gas flow sensor through solving like this in the low pressure exhaust gas circulation canal.This allows in the low pressure exhaust gas circulation canal, directly to measure exhaust mass stream, to guarantee accurately to regulate motor.Additionally, this sensor is used to regulate waste gas circulating valve.Whole adjustings of air and waste gas can be in this device be only undertaken by the pressure and temperature sensor at exhaust mass flow sensor, air mass flow sensor and suction pipe place.When using the high pressure exhaust gas circulation means extraly, can calculate the EGR rate of high pressure exhaust gas circulation canal through calculating, this can produce very little error, because this high-pressure system is mainly used in the stage at the hot machine of motor.
Preferred first waste gas circulating valve is arranged in the low pressure exhaust gas circulation canal and the first exhaust mass flow sensor is arranged in the upper reaches of first waste gas circulating valve.The advantage of this mounting point is that this is in the highest EGT of existence in the low pressure exhaust gas race way, thus, avoids the formation condensation at exhaust mass flow sensor place.Additionally in this zone, do not exist and disturb stream or have the less interference stream relevant with valve.
Advantageously, can cool off the ground cycle gas through this first gaseous effluent at arranged downstream first gaseous effluent of the first exhaust mass flow sensor.This has reduced the emission of harmful substances that in thermo-motor, occurs.
In a kind of preferred design proposal; Scheme for exhaust gas circulation system has the high pressure exhaust gas circulation canal; Its turbine upper reaches in turbosupercharger feed gas-entered passageway along separate routes and in the compressor downstream of turbosupercharger from the exhaust passage; Wherein, in the high pressure exhaust gas circulation canal, arrange one second exhaust mass flow sensor, also can directly flow with the cycle gas of accurately measuring through from here through this second exhaust mass flow sensor.When using this second exhaust mass flow sensor, can cancel Air flow meter and air stream and confirm by pressure transducer in the suction pipe and temperature transducer.This causes when regulating the circuit exhausted air quantity, having improved extraly the result and has therefore improved burning, can reduce emission of harmful substances thus.
In a kind of improvement project of the utility model, in the high pressure exhaust gas circulation canal, arrange one second waste gas circulating valve, wherein, the second exhaust mass flow sensor is arranged in the downstream of second waste gas circulating valve and second gaseous effluent in the high pressure exhaust gas circulation canal.Temperature in this zone is lower than the temperature in the zone before the cooler, and waste gas still has very high temperature owing to it is adjacent with the firing chamber in this zone.Therefore, the calibration owing to sensor can realize measuring more accurately.
The preferred first and second exhaust mass flow sensor are worked according to hotting mask pneumatic measurement ratio juris.This has formed cheap, system reliably and accurately gradually in air mass sensor.These two kinds of sensors are for example put down in writing in DE 10 2,005 061 533 B4 that the applicant writes.This sensor is insensitive to the cigarette ash in the waste gas and other pollutant.
In a kind of improvement project of the waste gas system of pressing the utility model, the low pressure exhaust gas circulation canal is in the downstream of particulate filter and upper reaches shunt from the exhaust passage of outlet valve.Prevent that through diesel particulate filter particle from drawing through the low pressure exhaust gas circulation canal like cigarette ash and to be back in the firing chamber.This improves combustion process again.The layout of outlet valve is guaranteed to increase via low pressure branch road circuit exhaust flow, because can improve the waste gas back pressure and therefore improve the pressure difference that exists by this valve.
In the favourable organization plan of another kind, the high pressure exhaust gas circulation canal feeds gas-entered passageway in the downstream of charger-air cooler.This especially uses in the stage at hot machine, because waste gas can circulate in hot state, and can in charger-air cooler, not be cooled.Then take place that internal-combustion engine heats faster and therefore the hot machine stage of internal-combustion engine shorten, generally produce most harmful matter in the stage at this hot machine.
Therefore, create a kind of scheme for exhaust gas circulation system, in this system, directly confirm exhaust mass stream, so that can regulate more reliably.The outstanding performance of described system be used for further reducing harmful matter, adjustment process accurately and fast.
Description of drawings
Followingly further set forth the utility model according to accompanying drawing.In the accompanying drawings:
Fig. 1 schematically illustrates a kind of form of implementation by the diesel exhaust circulatory system of the utility model.
Embodiment
Press the scheme for exhaust gas circulation system of the utility model and be made up of engine cylinder-body 2, fuel-air mixture burns with the waste gas of input in the known manner in this engine cylinder-body 2.The exhaust passage 4 that mainly is the exhaust elbow form is directed to exhaust outlet 6 from engine cylinder-body 2, sees along the flow direction of waste gas and before this exhaust outlet 6, arranges an outlet valve 8.Low pressure exhaust gas circulation canal 10 in the upper reaches of outlet valve 8 and downstream that are arranged in the diesel particulate filter 9 in the exhaust passage 4 equally from exhaust passage 4 along separate routes.
This low pressure exhaust gas circulation canal 10 is positioned at the area of low pressure of internal-combustion engine, just the downstream of exhaust turbine supercharger 14 exhaust driven gas turbines 12.In low pressure exhaust gas circulation canal 10, arrange one first waste gas circulating valve 16 and one first gaseous effluent 18, can regulate the exhausted air quantity of EGT and expectation by this first waste gas circulating valve 16 and first gaseous effluent 18.Low pressure exhaust gas circulation canal 10 is in the downstream of gaseous effluent 18, feed in the gas-entered passageway 22 of internal-combustion engine at the upper reaches of the compressor 20 of the downstream of unshowned air inlet and turbosupercharger 14, at this just in the area of low pressure before the compression set at waste gas-air mixture.
Press the utility model and in low pressure exhaust gas circulation canal 10, arranging an exhaust air mass flow sensor 24 before first waste gas circulating valve 16 with before first gaseous effluent 18 along the flow direction of waste gas.This exhaust air mass flow sensor 24 is used for confirming exhaust mass stream and is connected with a unshowned device for controlling engine usually that this device for controlling engine is handled the data of the first exhaust air mass flow sensor 24 and for example is used for adjusting best waste gas circulating valve 16.The trend of formation condensation in gaseous effluent 18 and position before the waste gas circulating valve 18 are reduced in the zone of exhaust air mass flow sensor; Because before gaseous effluent, in low pressure exhaust gas circulation canal 10, there is the highest temperature; Wherein, EGT has been starkly lower than the temperature in engine cylinder-body 2 outlet ports.Device preventing before waste gas circulating valve 16, the interference of flowing through waste gas circulating valve 16 exerts an influence to measurement.
This high pressure exhaust gas circulation canal 28 is in the shunt from exhaust passage 4 of the upper reaches of turbosupercharger 14 turbines 12.Second waste gas circulating valve 30 and second gaseous effluent 32 that is used to regulate EGT that is used to regulate exhaust mass stream is set in this high pressure exhaust gas circulation canal 28.Additionally the second exhaust air mass flow sensor 34 also in this exhaust gas recirculation passage 28, work according to hotting mask pneumatic measurement ratio juris by this second exhaust air mass flow sensor 34 as the first exhaust air mass flow sensor 24.
This means that the heating resistor of sensor heating, wherein, the heat transfer that heating resistor is produced through convection current is to the medium that flows.The heating resistor variation of temperature that causes thus or be the yardstick of existing mass flow for obtaining heating resistor temperature extra power consumption.These sensors are worked in the known manner very reliably.Only avoid the sediments on these sensor surfaces, making provides the possibility of combustion deposit usually when in vent systems, using.
This first exhaust air mass flow sensor 34 is arranged in the downstream of gaseous effluent 32.There is not the EGT higher at this than the inlet of high pressure exhaust gas circulation canal 28.This allows to measure more accurately, because these sensors are not to design and calibrate for high EGT.Therefore be that identical sensor 24,34 is used in two exhaust passages 10,28.Can measure the exhaust mass stream in the high pressure exhaust gas circulation canal 28 by direct and accurate way equally through exhaust air mass flow sensor 34, and offer the control unit of engine that is used to regulate this second exhausted air quantity and internal-combustion engine.
When internal combustion engine, draw to be back to gas-entered passageway 22 and therefore to draw through low pressure exhaust gas circulation canal 10 or through high pressure exhaust gas circulation canal 28 or through two path 10s, 28 according to the characteristic family waste gas of storage and be back to engine cylinder-body 2.Can in the suction pipe zone, regulate circuit exhaust mass stream and inhaled air mass flow by two waste gas circulating valves 16,30 and through easy temperature and pressure sensor through two exhaust air mass flow sensors 24,34 fully, because amount of air drawn can be calculated by simple method by the total air flow that maybe will calculate that records through the temperature and pressure sensor with the difference that exhaust flow forms.
Therefore realize accurately with directly measuring with a spot of measuring instrument according to simple method, this measurement can be used to improve the control of burning.Can not produce through the measuring instrument of saving other yet and to compare the higher cost of known form of implementation.
Obviously, the protection domain of the utility model is not limited to described form of implementation.Therefore; For example also can the exhaust air mass flow sensor only be set in the low pressure exhaust gas circulation canal and through gas-entered passageway in the additive air flowmeter that is provided with regulate; Wherein, in pressure duct, distribute also more inaccuracy through and waste gas more inaccurate to the adjusting of the necessary calculating exhausted air quantity of other measured value.
Also can consider about parts in this system,, but not allow to exceed the protection domain of independent claims like the variation of waste gas circulating valve and gaseous effluent, outlet valve or other layout of particulate filter.
Claims (7)
1. scheme for exhaust gas circulation system that is used for internal-combustion engine; It has exhaust passage (4) and gas-entered passageway (22), turbosupercharger (14) and low pressure exhaust gas circulation canal (10); This low pressure exhaust gas circulation canal (10) feeds in the said gas-entered passageway (22) from said exhaust passage (4) in said turbine (12) downstream of said turbosupercharger (14) along separate routes and at said compressor (20) upper reaches of said turbosupercharger (14); It is characterized in that, in said low pressure exhaust gas circulation canal (10), arrange the first exhaust gas flow sensor (24).
2. the scheme for exhaust gas circulation system that is used for internal-combustion engine as claimed in claim 1; It is characterized in that said first waste gas circulating valve (16) is arranged in the said low pressure exhaust gas circulation canal (10) and the said first exhaust mass flow sensor (24) is arranged in the upper reaches of said first waste gas circulating valve (16).
3. according to claim 1 or claim 2 the scheme for exhaust gas circulation system that is used for internal-combustion engine is characterized in that, at arranged downstream first gaseous effluent (18) of the said first exhaust mass flow sensor (24).
4. the scheme for exhaust gas circulation system that is used for internal-combustion engine as claimed in claim 1; It is characterized in that; Said scheme for exhaust gas circulation system has high pressure exhaust gas circulation canal (28); This high pressure exhaust gas circulation canal (28) feeds said gas-entered passageway (22) at turbine (12) upper reaches of said turbosupercharger (14) along separate routes and in said compressor (20) downstream of said turbosupercharger (14) from said exhaust passage (4); Wherein, in said high pressure exhaust gas circulation canal (28), arrange one second exhaust mass flow sensor (34).
5. the scheme for exhaust gas circulation system that is used for internal-combustion engine as claimed in claim 4; It is characterized in that; In said high pressure exhaust gas circulation canal (28), arrange one second waste gas circulating valve (30); Wherein, the said second exhaust mass flow sensor (34) be arranged in said second waste gas circulating valve (30) and second gaseous effluent (32) downstream in said high pressure exhaust gas circulation canal (28).
6. the scheme for exhaust gas circulation system that is used for internal-combustion engine as claimed in claim 1 is characterized in that, said low pressure exhaust gas circulation canal (10) is in the downstream of particulate filter (9) and upper reaches shunt from said exhaust passage (4) of outlet valve (8).
7. the scheme for exhaust gas circulation system that is used for internal-combustion engine as claimed in claim 4 is characterized in that, said high pressure exhaust gas circulation canal (28) feeds said gas-entered passageway (22) in the downstream of charger-air cooler (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200692146U CN202108613U (en) | 2011-03-16 | 2011-03-16 | Waste gas circulation system for combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200692146U CN202108613U (en) | 2011-03-16 | 2011-03-16 | Waste gas circulation system for combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202108613U true CN202108613U (en) | 2012-01-11 |
Family
ID=45434050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200692146U Expired - Fee Related CN202108613U (en) | 2011-03-16 | 2011-03-16 | Waste gas circulation system for combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202108613U (en) |
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2011
- 2011-03-16 CN CN2011200692146U patent/CN202108613U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20170316 |
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| CF01 | Termination of patent right due to non-payment of annual fee |