CN112627995B - Supercharged gasoline engine and adjusting pipeline and adjusting method thereof - Google Patents
Supercharged gasoline engine and adjusting pipeline and adjusting method thereof Download PDFInfo
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- CN112627995B CN112627995B CN201910905914.5A CN201910905914A CN112627995B CN 112627995 B CN112627995 B CN 112627995B CN 201910905914 A CN201910905914 A CN 201910905914A CN 112627995 B CN112627995 B CN 112627995B
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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
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
- F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of 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
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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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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- 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
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Exhaust Gas After Treatment (AREA)
- Supercharger (AREA)
Abstract
The invention relates to a supercharged gasoline engine and an adjusting pipeline and an adjusting method thereof, wherein the adjusting pipeline of the supercharged gasoline engine comprises an air bleed pipeline and a first adjusting valve arranged on the air bleed pipeline, the first adjusting valve is connected with an ECU, and one end of the air bleed pipeline is communicated with the front end of a three-way catalyst; when the excess air coefficient of the gas at the front end of the three-way catalyst is smaller than a preset value, the ECU controls the opening of the first adjusting valve and introduces air to the front end of the catalyst through the air introduction pipeline. The treatment efficiency of the three-way catalyst of the supercharged gasoline engine can be ensured while the protection of the supercharger and the power index of the engine are not influenced, and the emission of the supercharged gasoline engine is ensured to meet the standard.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a supercharged gasoline engine and an adjusting pipeline and an adjusting method thereof.
Background
At present, the emission and oil consumption regulations of internal combustion engines are getting tighter and tighter, and energy conservation and emission reduction are the mainstream directions for the development of the internal combustion engines.
At present, the mainstream aftertreatment device of the gasoline engine for the vehicle is a three-way catalyst, but the three-way catalyst can only treat exhaust gas with lambda (excess air ratio) of which the value is near 1, and if the lambda deviates from 1 to be too large (such as fuel excess and enrichment), the treatment efficiency of the three-way catalyst is greatly reduced. Generally, because of the protection of a supercharger, the supercharged gasoline engine generally needs to be enriched at a high speed and under a large load to reduce the exhaust temperature, so that the treatment efficiency of the three-way catalyst is reduced, and the gaseous emission is deteriorated.
The GB6b regulation adds the RDE (actual driving condition) cycle requirement, and under the RDE cycle, the gasoline engine always runs to an enrichment area, and at the moment, the emission is easy to exceed the standard. A common countermeasure is to reduce the engine external characteristics and to discard the enrichment region, but this also means a reduction in the engine power index.
Therefore, how to ensure the treatment efficiency of the three-way catalyst of the supercharged gasoline engine without influencing the supercharger protection and the engine power index and further ensure that the emission of the supercharged gasoline engine meets the standard is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a supercharged gasoline engine, an adjusting pipeline and an adjusting method thereof, which can ensure the treatment efficiency of a three-way catalyst of the supercharged gasoline engine and further ensure that the emission of the supercharged gasoline engine meets the standard while not influencing the protection of a supercharger and the power index of an engine.
In order to solve the technical problem, the invention provides a regulating pipeline of a supercharged gasoline engine, which comprises an air bleed pipeline and a first regulating valve arranged on the air bleed pipeline, wherein the first regulating valve is connected with an ECU (electronic control unit), and one end of the air bleed pipeline is communicated with the front catalytic end of a three-way catalyst; and when the excess air coefficient of the gas at the front end of the three-way catalyst is smaller than a preset value, the ECU controls the opening of the first regulating valve and leads air into the front end of the catalyst through the bleed air pipeline.
Detecting the oxygen content in the gas at the front end of the catalyst by the oxygen sensor, feeding the detection result of the oxygen content back to the ECU, calculating a numerical value (lambda) of an excess air coefficient according to the oxygen content by the ECU, comparing the calculated result lambda with a preset value, if the lambda is smaller than the preset value, indicating that the air content (oxygen content) in the gas at the front end of the catalyst is insufficient and the fuel is excessive (enriched), opening and adjusting the opening degree of a first adjusting valve by the ECU, supplementing air to the front end of the catalyst through a bleed air pipeline, calculating the lambda according to the oxygen content in the gas at the front end of the catalyst after air is supplemented, comparing the lambda with the preset value, if the lambda reaches the preset value, ending the adjustment, and if the lambda is still smaller than the preset value, increasing the opening degree of the first adjusting valve, calculating the lambda again and comparing the lambda with the preset value until the lambda of the gas at the front end of the catalyst reaches the preset value.
That is to say, when the boost gasoline engine is in high speed and heavy load, the lambda of the raw gas at the front end of the catalyst (the exhaust gas after the turbine of the boost gasoline engine is pushed to work) is smaller than the preset value due to the reasons of enrichment and reduction of exhaust temperature, namely when the air content of the raw gas is insufficient, air is supplemented into the front end of the catalyst through the air introducing pipeline, the supplemented air and the raw gas are introduced into the three-way catalyst together from the front end of the catalyst, the air content in the gas introduced into the three-way catalyst can be improved, the oxygen sensor detects the oxygen content at the front end in real time, the ECU calculates the lambda of the front end of the catalyst in real time and gradually increases the opening of the first regulating valve until the lambda of the gas at the front end of the catalyst meets the preset value, and then the opening of the first regulating valve is kept, so that the processing efficiency of the three-way catalyst can be effectively ensured.
On the basis of the structure of an original supercharged gasoline engine, the adjusting pipeline of the supercharged gasoline engine is simple in structure and convenient to achieve, and can adjust the gas lambda led into the three-way catalyst from the front end to reach the preset value when the gas lambda of the front end is smaller than the preset value by additionally arranging the gas guiding pipeline and the first adjusting valve, so that the treatment efficiency of the three-way catalyst is guaranteed.
Optionally, the bleed air pipeline is communicated with the pressure front end and the pressure rear end of the supercharger.
Optionally, the system further comprises an exhaust pipeline and a second regulating valve arranged on the exhaust pipeline, the second regulating valve is connected with the ECU, and one end of the exhaust pipeline is communicated with the rear end of the pressure sensor; and when the excess air coefficient is not less than the preset value and a throttle valve of the supercharged gasoline engine is not fully opened, the ECU controls the opening degree of the second regulating valve and exhausts air at the rear end of the compressor through the exhaust pipeline.
Optionally, the exhaust line is communicated with the after-pressure end and the after-catalyst end of the three-way catalyst.
Optionally, the adjusting pipeline comprises a three-way valve, a first branch communicated with the rear end of the pressure device, a second branch communicated with the front end of the pressure device, and a third branch communicated with the rear end of the pressure device; the first branch and the second branch are connected in series through the three-way valve to form the bleed pipeline, and the first branch and the third branch are connected in series through the three-way valve to form the exhaust pipeline; the first branch is provided with a regulating valve, and the regulating valve forms the first regulating valve and the second regulating valve.
Optionally, the first branch is provided with a flow detection unit in communication with the ECU for detecting the ventilation of the bleed air line and the exhaust line.
Optionally, the flow detection unit is a differential pressure sensor disposed at two ends of the regulating valve.
Optionally, the first branch is provided with a check valve, and the flow direction of the check valve is from the first branch to the second branch and the third branch.
The invention also provides a supercharged gasoline engine which comprises a three-way catalyst, a supercharger and the adjusting pipeline, wherein an oxygen sensor is arranged at the front end of the three-way catalyst.
The technical effect of the supercharged gasoline engine with the adjusting pipeline is similar to that of the adjusting pipeline, and is not repeated herein for saving space.
The invention also provides an adjusting method of the supercharged gasoline engine, which comprises the following steps:
s1: detecting the oxygen content of gas at the front end of the three-way catalyst;
s2: calculating an excess air factor from the oxygen content;
s3: and when the excess air coefficient is smaller than a preset value, supplementing air to the front end of the catalyst through an air entraining pipeline, and gradually increasing the supplemented air quantity until the excess air coefficient reaches the preset value.
When the supercharged gasoline engine is in high speed and heavy load, the lambda of the raw gas (waste gas after the turbine of the supercharged gasoline engine is pushed to work) at the front end is smaller than the preset value due to the reasons of enrichment, reduction of exhaust temperature and the like, namely when the air content of the raw gas is insufficient, air is supplemented into the front end of the supercharged gasoline engine through the air introducing pipeline, the supplemented air and the raw gas are introduced into the three-way catalyst together from the front end of the supercharged gasoline engine, and the air content of the gas introduced into the three-way catalyst can be improved.
Specifically, the oxygen sensor detects the oxygen content of the catalytic front end in real time, calculates the lambda of the gas at the catalytic front end in real time, and gradually increases the supplemented air amount until the lambda of the gas at the catalytic front end meets a preset value, so that the treatment efficiency of the three-way catalyst can be effectively ensured.
Alternatively, in step S3, the step of supplementing air to the front end of the catalyst through the bleed air line means that air at the rear end of the supercharger is introduced into the front end of the catalyst through the bleed air line.
Optionally, step S4 is further included after step S2: when the excess air coefficient is not less than a preset value and the throttle valve of the supercharged gasoline engine is not fully opened, discharging air at the rear end of the supercharger through an exhaust pipeline, gradually increasing the discharged air quantity and simultaneously increasing the opening degree of the throttle valve until the throttle valve is fully opened.
Drawings
FIG. 1 is a schematic structural diagram of a supercharged gasoline engine provided by an embodiment of the invention;
FIG. 2 is a block flow diagram of a method of regulating a supercharged gasoline engine provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of a regulation of a supercharged gasoline engine according to an embodiment of the present invention.
In the accompanying fig. 1-3, the reference numerals are illustrated as follows:
1-a first branch; 2-a second branch; 3-a third branch; 4-three-way valve; 5-adjusting the valve; 6-a differential pressure sensor; 7-a one-way valve; 10-three-way catalyst, 11-catalytic front end, 12-catalytic rear end; 20-supercharger, 21-pressure wheel, 22-turbine, 23-rear end of pressure; 30-a throttle valve; 40-an ECU; 50-oxygen sensor.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-3, fig. 1 is a schematic structural diagram of a supercharged gasoline engine according to an embodiment of the present invention; FIG. 2 is a block flow diagram of a method of regulating a supercharged gasoline engine provided by an embodiment of the present invention; FIG. 3 is a schematic diagram of a boost gasoline engine according to an embodiment of the present invention.
The embodiment of the invention provides a supercharged gasoline engine and an adjusting pipeline thereof, wherein as shown in figure 1, the supercharged gasoline engine comprises a supercharger 20, a three-way catalyst 10 and the adjusting pipeline, and an oxygen sensor 50 is arranged at the front end 11 of the three-way catalyst 10.
Specifically, the regulating pipeline of the supercharged gasoline engine comprises an air bleed pipeline and a first regulating valve arranged on the air bleed pipeline, one end of the air bleed pipeline is communicated with the front end 11 of the three-way catalyst 10 and used for supplementing air to the front end 11, and the first regulating valve is connected with the ECU 40.
Herein, the rear end 23 of the supercharger 20 refers to the end of the supercharger 20 facing the pressure wheel 21, i.e., the end after supercharging; the catalyst front end 11 of the three-way catalyst 10 refers to an end before catalyst, that is, an air intake end of the three-way catalyst 10; the catalyst rear end 12 of the three-way catalyst 10 is the catalyzed end, namely the air outlet end of the three-way catalyst 10; the preset value of the excess air factor can be adjusted according to the specific structure, parameters and the like of the supercharged gasoline engine, and the preset value can be a specific numerical value (such as 1) or a numerical range (such as 0.95-1.05), and is not limited specifically herein.
The oxygen sensor 50 is configured to detect an oxygen content of the gas in the catalyst front end 11, detect the oxygen content in the gas in the catalyst front end 11 through the oxygen sensor 50, and feed back a detection result of the oxygen content to the ECU40, the ECU40 calculates a value (lambda) of an excess air coefficient according to the oxygen content, compares the calculated result lambda with a preset value, if the lambda is smaller than the preset value, it indicates that the air content (oxygen content) in the gas in the catalyst front end 11 is insufficient, and the fuel is excessive (rich), at this time, the ECU40 opens and adjusts an opening degree of the first adjusting valve, and supplies air to the catalyst front end 11 through the bleed pipe, then calculates the lambda according to the oxygen content in the gas in the catalyst front end 11 after supplying air and compares with the preset value, if the lambda reaches the preset value, the adjustment is completed, and if the lambda is still smaller than the preset value, increases the opening degree of the first adjusting valve, calculates the lambda again and compares with the preset value until the lambda of the gas in the catalyst front end 11 reaches the preset value.
That is, when the lambda of the raw gas (the exhaust gas after the turbine 22 of the supercharged gasoline engine is pushed to do work) of the catalyst front end 11 is smaller than the preset value due to the reasons of enrichment and temperature reduction of the supercharged gasoline engine under high speed and heavy load, that is, when the air content of the raw gas is insufficient, air is supplied to the catalyst front end 11 through the air introducing pipeline, the supplied air and the raw gas are introduced into the three-way catalyst 10 from the catalyst front end 11 together, the air content of the gas introduced into the three-way catalyst 10 can be increased, the oxygen sensor 50 detects the oxygen content of the catalyst front end 11 in real time, the ECU40 calculates the lambda of the catalyst front end 11 in real time and gradually increases the opening of the first adjusting valve until the lambda of the gas of the catalyst front end 11 meets the preset value, and the opening of the first adjusting valve is maintained, so that the treatment efficiency of the three-way catalyst 10 can be effectively ensured.
The adjusting pipeline of the supercharged gasoline engine provided by the embodiment is based on the structure of the original supercharged gasoline engine, and can adjust the gas lambda introduced into the three-way catalyst 10 from the front end 11 to reach the preset value only by additionally arranging the gas guiding pipeline and the first adjusting valve when the gas lambda of the front end 11 is smaller than the preset value, so that the treatment efficiency of the three-way catalyst 10 is ensured, and the adjusting pipeline is simple in structure and convenient to realize.
In the above embodiment, the bleed air pipeline is connected to the front end 11 and the rear end 23 of the supercharger 20, that is, the bleed air pipeline is used to introduce the supercharged air into the front end 11, or in this embodiment, the bleed air pipeline may also be used to supplement the external air into the front end 11, and the lambda of the gas in the front end 11 may also be realized.
And when communicating the bleed air pipeline in the pressure rear end 23 of urging front end 11 and booster 20, because the air pressure increase after the pressure boost for the bleed air pipeline is greater than the pressure towards the pressure of urging one side of front end 11 towards the pressure of one side of pressure rear end 23, press rear end 23 promptly and urge front end 11 to have pressure differential, consequently, ECU40 only needs the aperture of adjusting first governing valve, the air after the pressure boost can be under the effect of pressure differential to urging front end 11 one side to flow, need not to establish driving part such as pump in addition, can simplify overall structure.
When the pressurized gas is introduced into the catalyst tip 11 through the bleed air line, the opening degree of the throttle valve 30 of the supercharged steam turbine needs to be increased appropriately, which reduces the throttle loss and reduces the fuel consumption.
In the above embodiment, the regulating circuit further comprises an exhaust line and a second regulating valve disposed in the exhaust line, wherein the second regulating valve is connected to the ECU40, and one end of the exhaust line is communicated with the rear end 23 of the supercharger 20 for discharging the supercharged air. Specifically, when the above lambda is not less than the preset value and the throttle valve 30 of the supercharged gasoline engine is not fully opened, the ECU40 controls the opening degree of the second regulating valve and exhausts the gas of the pressure rear end 23 of the supercharger 20 through the exhaust line.
In detail, when the above lambda is not less than the preset value, the processing efficiency of the three-way catalyst 10 can be ensured, at this time, the bleed air pipe does not need to be operated, and if the throttle valve 30 of the supercharged gasoline engine is fully opened at this time, the exhaust pipe does not need to be operated, if the throttle valve 30 of the supercharged gasoline engine is not fully opened at this time, the ECU40 can gradually increase the opening degree of the second regulating valve and the opening degree of the throttle valve 30 at the same time, the opening degree of the throttle valve 30 is increased, the intake air amount into the supercharger 20 is increased, and the supercharged air is discharged through the exhaust pipe, the opening degree of the second regulating valve is increased, the exhaust gas amount is increased, and the required air amount of the supercharged gasoline engine before the start of exhaust (before the opening degree of the second regulating valve and the opening degree of the throttle valve 30 are increased) and after the start of exhaust (after the opening degree of the second regulating valve and the opening degree of the throttle valve 30 are increased) is constant, and therefore, the increase of the intake air amount and the balance of exhaust gas amount are maintained by adjusting the opening degree of the throttle valve 30 and the engine can be maintained until the engine is fully opened. If the engine speed/load changes midway, the engine stops, and the working condition of the supercharged gasoline engine is not influenced.
That is to say, on the structural basis of original pressure boost gasoline engine, only through addding exhaust pipe and second governing valve, can be on the basis of guaranteeing normal work, increase this pressure boost gasoline engine's throttle valve 30's aperture, reduce the throttle loss, reduce the oil consumption, its simple structure, be convenient for realize.
Furthermore, the exhaust pipeline is communicated with the rear pressing end 23 and the rear pressing end 12 of the three-way catalyst 10, namely, the exhaust pipeline discharges the pressurized air and the gas treated by the three-way catalyst 10 together and enters the muffler, so that the air outlet of the pressurized gasoline engine can be reduced, the change of the original structure is reduced, and the integral structure is simplified.
In the above embodiment, the regulating pipeline includes a three-way valve 4, and a first branch 1, a second branch 2, and a third branch 3 respectively connected to the three-way valve 4, where the first branch 1 and the second branch 2 are connected in series to form the bleed pipeline, and the first branch 1 and the third branch 3 are connected in series to form the exhaust pipeline. That is, the first branch 1 communicates with the transition end 23, the second branch 2 communicates with the catalyst front end 11, and the third branch 3 communicates with the catalyst rear end 12.
Moreover, the first branch 1 is provided with a regulating valve 5, when the first branch 1 is communicated with the second branch 2, the regulating valve 5 is the first regulating valve, when the first branch 1 is communicated with the third branch 3, the regulating valve 5 is the second regulating valve, namely, the air guide pipeline and the exhaust pipeline share the same regulating valve 5 and the first branch 1, so that the whole structure can be simplified, and the regulating pipeline can be conveniently arranged in the supercharged gasoline engine.
In the above embodiment, the first branch 1 is provided with the flow rate monitoring unit for detecting the ventilation amount of the bleed air line and the exhaust line, the flow rate monitoring unit is communicated with the ECU40 and feeds back the detection result thereof to the ECU40 so as to know the air drawn from the rear end 23, and the assist ECU40 monitors the adjustment of lambda and the adjustment of the opening degree of the throttle valve 30. And the flow detection unit is arranged to facilitate monitoring of the regulating pipeline, so as to avoid abnormality of the bleed air system caused by failure of the oxygen sensor 50 and other conditions.
Specifically, when the bleed air pipeline and the exhaust pipeline are two mutually independent pipelines, the bleed air pipeline and the exhaust pipeline can be respectively provided with the flow detection unit, and when the bleed air pipeline and the exhaust pipeline share the first branch 1, the flow detection unit can be arranged on the first branch 1, so that the overall structure is simplified.
Further, the flow rate detecting unit is a differential pressure sensor 6 disposed at both ends of the regulating valve 5, and is configured to detect a differential pressure at both ends of the regulating valve 5, and calculate an air flow rate flowing through the first branch 1 according to the differential pressure. Alternatively, in the present embodiment, the flow rate detection unit may be provided as the differential pressure sensor 6, which is more economical than other measurement components such as an air flow meter.
In the above embodiment, the first branch 1 is provided with the check valve 7, and the flow direction of the check valve 7 is from the first branch 1 to the second branch 2 and the third branch 3, so as to prevent the gas urging the front end 11 and the gas urging the rear end 12 from flowing back to the rear end 23.
In addition, an embodiment of the present invention further provides a method for adjusting a supercharged gasoline engine, specifically, as shown in fig. 2, the method for adjusting a supercharged gasoline engine includes the following steps:
s1: the oxygen content of the gas at the catalyst tip 11 of the three-way catalyst 10 is detected.
An oxygen sensor 50 is provided at the catalyst tip 11 of the three-way catalyst 10 for detecting the oxygen content of the gas at the catalyst tip 11, that is, the oxygen content of the gas introduced into the three-way catalyst 10.
S2: the excess air factor is calculated from the above oxygen content.
The oxygen sensor 50 feeds back the oxygen content detected in step S1 to the ECU40, and the ECU40 calculates the current excess air coefficient (lambda) based on the oxygen content.
S3: when the excess air ratio is smaller than the preset value, air is supplemented to the catalyst front end 11 through the bleed air duct, and the amount of supplemented air is gradually increased until the excess air ratio reaches the preset value.
Comparing the lambda obtained in the step S2 with a preset value, if the lambda is smaller than the preset value, it indicates that the air content (oxygen content) in the gas is insufficient and the fuel is excessive (rich), at this time, air is supplemented to the catalyst front end 11, then the lambda is calculated based on the oxygen content in the gas of the catalyst front end 11 after the air is supplemented and compared with the preset value, if the lambda reaches the preset value, the adjustment is finished, if the lambda is still smaller than the preset value, the opening degree of the first regulating valve (i.e., the regulating valve 5) of the bleed air pipeline is increased, and the lambda is calculated again and compared with the preset value until the lambda of the gas of the catalyst front end 11 reaches the preset value.
That is to say, when the boost gasoline engine is in high speed and heavy load, the lambda of the raw gas (the exhaust gas after the turbine 22 of the boost gasoline engine is pushed to do work) at the catalyst front end 11 is smaller than the preset value due to the reasons of enrichment and reduction of exhaust temperature, that is, when the air content of the raw gas is insufficient, air is supplemented into the catalyst front end 11 through the bleed air pipeline, and the supplemented air and the raw gas are introduced into the three-way catalyst 10 through the catalyst front end 11, so that the air content in the gas introduced into the three-way catalyst 10 can be increased.
Specifically, the oxygen sensor 50 detects the oxygen content of the catalytic front end 11 in real time, calculates the lambda of the gas of the catalytic front end 11 in real time, and gradually increases the amount of the supplemented air until the lambda of the gas of the catalytic front end 11 meets a preset value, thereby effectively ensuring the treatment efficiency of the three-way catalyst 10.
In the above embodiment, the air is supplied to the catalyst tip 11 in step S3, which means that air at the post-compression end 23 of the supercharger 20 is introduced into the catalyst tip 11 through the bleed air line, that is, the bleed air line is connected to the post-compression end 23 and the catalyst tip 11, and pressurized air can be supplied to the catalyst tip 11. Alternatively, in this embodiment, the air-introducing pipeline may also supplement external air to the catalyst tip 11, and similarly, lambda of the gas in the catalyst tip 11 may be adjusted.
And when communicating the bleed air pipeline in urging the pressure rear end 23 of front end 11 and booster 20, because the air pressure increase after the pressure boost for the bleed air pipeline is greater than the pressure towards urging one side of front end 11 towards the pressure of one side of pressure rear end 23, presses rear end 23 promptly and urges front end 11 to have pressure differential, makes the air after the pressure boost can urge one side of front end 11 to flow under the effect of pressure differential, need not to establish driving part such as pump in addition, can simplify overall structure.
When the pressurized gas is introduced into the catalytic front end 11 through the bleed air line, the opening degree of the throttle valve 30 of the supercharged steam turbine needs to be appropriately increased, so that the throttle loss can be reduced and the fuel consumption can be reduced.
In the above embodiment, as shown in fig. 2, after step S2, step S4 is further included: when the excess air ratio is not less than the preset value and the throttle valve 30 of the supercharged gasoline engine is not fully opened, the air at the rear end 23 of the supercharger is discharged through the exhaust line, the discharged air amount is gradually increased and simultaneously the opening degree of the throttle valve 30 is increased until the throttle valve 30 is fully opened.
In detail, when the lambda is not less than the preset value, the processing efficiency of the three-way catalyst 10 can be ensured, the bleed air pipe does not need to work, at this time, if the throttle valve 30 of the supercharged gasoline engine is fully opened, the exhaust pipe does not need to work, if the throttle valve 30 of the supercharged gasoline engine is not fully opened at this time, the exhaust amount of the exhaust pipe (the opening degree of the second regulating valve, namely the opening degree of the regulating valve 5 is increased) and the opening degree of the throttle valve 30 can be simultaneously and gradually increased, so that the intake air amount entering the supercharger 20 is increased, the exhaust amount of the supercharged air is increased through the exhaust pipe, and the required air amounts of the supercharged gasoline engine before and after the exhaust is started are not changed, therefore, the increase of the intake air amount and the balance of the exhaust amount are maintained by regulating the opening degree of the throttle valve 30 and the opening degree of the regulating valve 5, and the engine can be maintained at the original rotation speed/load until the throttle valve 30 is fully opened. If the engine speed/load changes midway, the engine stops, and the working condition of the supercharged gasoline engine is not influenced. And the opening degree of the throttle valve 30 of the supercharged gasoline engine is increased, so that the throttling loss can be reduced, and the oil consumption can be reduced.
Referring to fig. 3, under the same condition, lambda of the gas at the catalyst front end 11 is detected and calculated in real time, when lambda is smaller than a preset value, the air quantity of the gas at the catalyst front end 11 of the three-way catalyst 10 in the supercharged gasoline engine is adjusted through the bleed air pipeline (the first branch 1 and the second branch 2 are communicated) so that lambda of the catalyst front end 11 reaches (is not smaller than) the preset value to ensure the treatment efficiency of the three-way catalyst 10, then the adjustment is stopped (the opening degree of the adjusting valve 5 is kept unchanged), when the condition changes, lambda of the gas at the catalyst front end 11 is detected and calculated again, and when lambda is smaller than the preset value, the gas is supplemented to the catalyst front end 11 through the bleed air pipeline again according to the above method.
If lambda is not less than the preset value and the regulating valve 5 is in a closed state (i.e. the make-up air adjustment is not performed on the front end 11), at this time, if the throttle valve 30 is fully opened, the regulating valve 5 is closed without any adjustment, if the throttle valve 30 is not fully opened, the air of the rear end 23 of the supercharger 20 is exhausted through an exhaust pipeline (the first branch 1 and the third branch 3 are communicated), meanwhile, the adjustment is stopped when the opening degree of the throttle valve 30 is increased until the throttle valve 30 is fully opened, the opening degree of the regulating valve 5 is kept unchanged, the opening degree of the throttle valve 30 is increased, the throttling loss can be reduced, the fuel consumption can be reduced, whether the original rotating speed/load of the engine can be maintained or not is observed while the opening degree of the regulating valve 5 and the opening degree of the throttle valve 30 are gradually increased, and if the critical value of the original rotating speed/load of the engine is maintained, the adjustment is stopped, and the opening degree of the regulating valve 5 is kept unchanged.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and embellishments can be made without departing from the principle of the present invention, and these modifications and embellishments should also be regarded as the protection scope of the present invention.
Claims (8)
1. The regulating pipeline of the supercharged gasoline engine is characterized by comprising a gas drainage pipeline and a first regulating valve arranged on the gas drainage pipeline, wherein the first regulating valve is connected with an ECU (40), and one end of the gas drainage pipeline is communicated with a catalytic front end (11) of a three-way catalyst (10);
when the excess air coefficient of the gas at the front catalytic end (11) of the three-way catalyst (10) is smaller than a preset value, the ECU (40) controls the opening of the first regulating valve and leads air to the front catalytic end (11) through the air-leading pipeline;
the air-entraining pipeline is communicated with the front end (11) and the rear end (23) of the supercharger (20);
the exhaust system also comprises an exhaust pipeline and a second regulating valve arranged on the exhaust pipeline, the second regulating valve is connected with the ECU (40), and one end of the exhaust pipeline is communicated with the pressure rear end (23);
when the excess air ratio is not less than the preset value and a throttle valve (30) of a supercharged gasoline engine is not fully opened, the ECU (40) controls the opening degree of the second regulating valve and exhausts the air of the rear end (23) through the exhaust line.
2. The regulating circuit according to claim 1, characterized in that the exhaust line communicates with the after-pressure end (23) and the after-pressure end (12) of the three-way catalyst (10).
3. The regulating circuit according to claim 2, characterized in that it comprises a three-way valve (4), a first branch (1) communicating with the pressure rear end (23), a second branch (2) communicating with the pressure front end (11) and a third branch (3) communicating with the pressure rear end (12);
the first branch (1) and the second branch (2) are connected in series through the three-way valve (4) to form the gas guiding pipeline, and the first branch (1) and the third branch (3) are connected in series through the three-way valve (4) to form the gas exhaust pipeline;
first branch way (1) is equipped with governing valve (5), governing valve (5) form first governing valve with the second governing valve.
4. The regulating circuit according to claim 3, characterized in that the first branch (1) is provided with a flow detection unit communicating with the ECU (40) for detecting the ventilation of the bleed line and the exhaust line.
5. The regulating circuit according to claim 4, characterized in that the flow detection unit is a differential pressure sensor (6) provided at both ends of the regulating valve (5).
6. The regulating circuit according to claim 3, characterized in that the first branch (1) is provided with a non-return valve (7), the flow direction of the non-return valve (7) being directed from the first branch (1) to the second (2) and third (3) branch.
7. A supercharged gasoline engine, characterized by comprising a three-way catalyst (10), a supercharger (20) and an adjusting pipeline according to any one of claims 1-6, wherein the catalytic front end (11) of the three-way catalyst (10) is provided with an oxygen sensor (50).
8. A method for regulating a supercharged gasoline engine is characterized by comprising the following steps:
s1: detecting the oxygen content of the gas at the catalytic front end (11) of the three-way catalyst (10);
s2: calculating an excess air factor from the oxygen content;
s3: when the excess air coefficient is smaller than a preset value, supplementing air to the front end (11) through a bleed air pipeline, and gradually increasing the amount of supplemented air until the excess air coefficient reaches the preset value;
in the step S3, the air supplement to the front end (11) through the air guide pipeline means that the air of the rear end (23) of the supercharger (20) is introduced into the front end (11) through the air guide pipeline;
step S4 is also included after step S2: when the excess air ratio is not less than a preset value and a throttle valve (30) of the supercharged gasoline engine is not fully opened, air at a rear end (23) of the supercharger is exhausted through an exhaust pipeline, the exhaust air amount is gradually increased, and meanwhile, the opening degree of the throttle valve (30) is increased until the throttle valve (30) is fully opened.
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| US5493858A (en) * | 1992-06-23 | 1996-02-27 | Mitsubishi Denki Kabushiki Kaisha | Controlling apparatus for introduction air into exhaust pipe of internal combustion engine |
| US8438841B2 (en) * | 2009-09-29 | 2013-05-14 | Ford Global Technologies, Llc | Particulate filter regeneration in an engine |
| DE102010015295A1 (en) * | 2010-04-17 | 2011-10-20 | Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) | Device for charging an internal combustion engine, vehicle and method for charging an internal combustion engine |
| CN202017543U (en) * | 2011-03-07 | 2011-10-26 | 陈国华 | Electronic air injection device for purifying vehicle tail gas |
| US9238983B2 (en) * | 2012-09-06 | 2016-01-19 | Ford Global Technologies, Llc | Secondary air introduction system |
| CN103511042A (en) * | 2013-09-22 | 2014-01-15 | 潍柴动力股份有限公司 | Diesel engine filter active regeneration control method and system |
| DE102013226063A1 (en) * | 2013-12-16 | 2015-06-18 | Volkswagen Aktiengesellschaft | Internal combustion engine and method for operating an internal combustion engine |
| GB2522130A (en) * | 2015-01-20 | 2015-07-15 | Daimler Ag | Internal combustion engine for a vehicle |
| DE102015215373A1 (en) * | 2015-08-12 | 2017-02-16 | Volkswagen Ag | A method for the regeneration of exhaust aftertreatment components of an internal combustion engine and exhaust aftertreatment device for an internal combustion engine |
| US20170175655A1 (en) * | 2015-12-16 | 2017-06-22 | Caterpillar Inc. | Method for operating an engine |
| DE102017209693A1 (en) * | 2017-06-08 | 2018-12-13 | Volkswagen Aktiengesellschaft | Method for regenerating a particle filter in the exhaust system of an internal combustion engine and internal combustion engine |
| CN109386349A (en) * | 2017-08-09 | 2019-02-26 | 北京福田康明斯发动机有限公司 | Internal combustion engine regenerative system and internal combustion engine |
| CN108869012B (en) * | 2018-06-29 | 2019-12-10 | 潍柴动力股份有限公司 | Engine intake and exhaust device and control system |
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