CN113417748A - Engine system - Google Patents
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- CN113417748A CN113417748A CN202110676859.4A CN202110676859A CN113417748A CN 113417748 A CN113417748 A CN 113417748A CN 202110676859 A CN202110676859 A CN 202110676859A CN 113417748 A CN113417748 A CN 113417748A
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 67
- 239000007789 gas Substances 0.000 claims description 106
- 239000002912 waste gas Substances 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
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- 238000000429 assembly Methods 0.000 claims description 2
- 230000004043 responsiveness Effects 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000005474 detonation Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0082—Controlling each cylinder individually per groups or banks
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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
- 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
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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
- 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
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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]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/08—EGR systems specially adapted for supercharged engines for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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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
- 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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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
Abstract
The invention discloses an engine system, wherein one of the original cylinders is independently used as an independent cylinder, on the basis that the working cylinder carries out combustion working according to different working conditions of the engine, the independent air inlet control assembly controls air inlet quantity and the independent exhaust control assembly controls the quantity of exhaust gas participating in combustion, independent combustion control is carried out according to the requirements of the working cylinder under different working conditions, the generated exhaust gas meeting the requirements is supplemented into the working cylinder for auxiliary combustion, the working cylinder can be stably combusted under the EGR rate of about 33 percent, the heat efficiency is improved while the oil consumption is low, and the responsiveness of the engine is improved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to an engine system.
Background
The development of gasoline engines with high efficiency and low fuel consumption is an important subject facing the automobile industry. The main factors restricting the low-load thermal efficiency improvement of the gasoline engine comprise high pumping loss, low geometric compression ratio, low specific heat ratio of mixed gas and the like. While for high loads, detonation combustion is the main obstacle leading to low thermal efficiency of gasoline engines. Fuel consumption is necessary to improve the thermal efficiency, which leads to high fuel consumption.
Therefore, how to improve the thermal efficiency while reducing the oil consumption is an urgent problem to be solved at present.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides an engine system, the engine including: the working cylinder and the independent cylinder are any one of original cylinders of the engine, and the working cylinder is a cylinder except the independent cylinder in the original cylinders of the engine;
the working cylinder is used for performing combustion working according to different working conditions of the engine;
the independent cylinder is used for carrying out independent combustion control according to the requirements of the working cylinder under different working conditions, and waste gas meeting the requirements is generated and supplemented into the working cylinder for combustion; wherein the individual cylinders are configured with individual intake and exhaust control assemblies; the air inlet control assembly is arranged between an air inlet passage of the working cylinder and the single cylinder and is used for adjusting the air inlet amount in the single cylinder under different working conditions; the exhaust control assembly is connected with the working cylinder through a gas mixed flow device on the air inlet passage, and is used for adjusting the amount of waste gas entering the gas mixed flow device under different working conditions and supplementing the waste gas into the working cylinder through the gas mixed flow device for combustion.
Preferably, an ignition system and an intake manifold are arranged in the single cylinder;
and under different working conditions, selecting the ignition system to perform combustion control, or selecting the intake manifold to assist the ignition system to perform enrichment combustion control together.
Preferably, the intake air control assembly includes: the air conditioner comprises a branch air inlet passage and an individual cylinder air throttle arranged on the branch air passage, wherein the individual cylinder air throttle is used for adjusting the air inlet amount of an individual cylinder under different working conditions.
Preferably, the exhaust gas control assembly includes: a first exhaust branch flow passage and a second exhaust branch flow passage; the first branch exhaust flow passage is arranged between the single cylinder and the gas mixing device, and the second branch exhaust flow passage is obtained by diversion of the first branch exhaust flow passage;
an exhaust gas circulation valve is arranged on the first exhaust branch passage, and an exhaust check valve is arranged on the second exhaust branch passage;
under different working conditions, the amount of the exhaust gas entering the gas mixing device is adjusted through the exhaust gas circulating valve and the exhaust check valve together.
Preferably, the intake passage, the branch intake passage, the first branch exhaust passage, and the second branch exhaust passage are provided with various sensors.
Preferably, the exhaust check valve is provided with a water cooling passage.
Preferably, an exhaust gas heat exchange device is further disposed on the first exhaust branch flow path, and exhaust gas discharged from the single cylinder is introduced into the gas mixing device through the exhaust gas heat exchange device and the exhaust gas circulation valve;
the second exhaust branch flow passage is provided with a front exhaust pipe, and the exhaust gas guided from the first exhaust branch flow passage to the second exhaust branch flow passage is discharged through the exhaust check valve and the front exhaust pipe.
Preferably, the single cylinder is a compression ignition single cylinder engine or an ignition single cylinder engine.
Preferably, the ignition system is high energy ignition, and/or electrophoretic ignition.
Preferably, the system further comprises: a turbocharger;
the turbocharger is connected between the air inlet passage and the working cylinder, and air in the air inlet passage enters the working cylinder through the turbocharger according to different working conditions or enters the working cylinder through the air flow mixing device;
the turbocharger is also connected between the exhaust check valve and the preceding stage exhaust pipe.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides an engine system, wherein one of the original cylinders is independently used as an independent cylinder, on the basis that the working cylinder performs combustion working according to different working conditions of the engine, the independent air inlet control assembly controls air inlet quantity and the independent exhaust control assembly controls the quantity of exhaust gas participating in combustion, independent combustion control is performed according to the requirements of the working cylinder under different working conditions, the exhaust gas meeting the requirements is generated and supplemented into the working cylinder for auxiliary combustion, the working cylinder can be stably combusted under the EGR rate of about 33 percent, the heat efficiency of the working cylinder is improved while the oil consumption is low, and the responsiveness of the engine is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a schematic diagram of an engine system according to an embodiment of the invention.
Description of reference numerals: the device comprises an air filter 1, an electronic control supercharging component 2, a supercharger adjusting one-way valve 3, a turbocharger 4, a preceding stage exhaust pipe 5, an exhaust one-way valve 6, an exhaust gas heat exchange device 7, an exhaust gas circulation valve 8, a gas mixing device 9, a working cylinder throttle valve 10, a single cylinder throttle valve 11, an air flow sensor 12, an oxygen sensor 13, a first oxygen sensor 14, a temperature sensor 15, a differential pressure sensor 16, a supercharging pressure sensor 17, a second oxygen sensor 18, a first temperature pressure sensor 19, a second temperature pressure sensor 20, an intake manifold 21, a high-energy ignition 22, an ignition system 23 and a cold-heat exchanger 24.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
In order to solve the problems, the invention provides an engine system, on the basis of the traditional D-EGR and the D-EGR, only the external parts of the engine are designed correspondingly, and the accurate combustion control of a special exhaust gas recirculation system is realized, so that the effects of improving the thermal efficiency of the engine and reducing the fuel consumption are realized. Specifically, the main idea of the present invention is to perform a dedicated combustion control for a single cylinder of an engine, and to perform a lean combustion by separately performing an intake operation and a separate combustion control for the single cylinder. The cylinder is controlled according to the working requirement of the engine to generate special waste gas which is favorable for the combustion products and temperature of the working cylinder, and H in the waste gas2And combustion stabilizers such as CO, e.g. H in exhaust gas2The content of (A) is between 1% and 2.7%. The part of waste gas is led into the working cylinder to participate in combustion, so that the combustion stability of the working cylinder can be ensured, the compression ratio of the working cylinder is improved (can be improved to be more than 15: 1), the original emission of the engine is reduced, and the engine can stably combust at the EGR rate of about 33%. The heat efficiency of the engine can be improved to about 45 percent, the engine can meet the dynamic property and achieve excellent oil consumption at the same time by improving the heat efficiency, and the oil consumption rate is reduced to about 10 to 15 percent. In addition, the quick ignition of the catalyst can be promoted, the volume of the catalyst is effectively reduced, and the cost of the catalyst is reduced.
The engine system will now be described in detail with reference to fig. 1.
The engine includes: a working cylinder and a separate cylinder. The independent cylinder is any cylinder in the original cylinders of the engine, and the working cylinder is a cylinder in the original cylinders of the engine except the independent cylinder. And the working cylinder is used for performing combustion working according to different working conditions of the engine. And the independent cylinder is used for carrying out independent combustion control according to the requirements of the working cylinder under different working conditions, and generating waste gas meeting the requirements to be supplemented into the working cylinder for combustion. Taking a four-cylinder gasoline engine as an example, one of the cylinders is separated, and the single cylinder can be understood as a single-cylinder engine, and the single cylinder is used for carrying out specific combustion control according to the requirements of the engine.
The individual cylinders need to adopt over-rich combustion due to most working conditions, and in order to meet stable combustion control of the individual cylinders, the individual cylinders are provided with an individual intake control assembly and an individual exhaust control assembly. The independent air inlet control assembly and the independent air outlet control assembly of the independent cylinder are coordinately controlled when the independent cylinder is required to supplement the working cylinder, and the independent air inlet control assembly and the independent air outlet control assembly are used for coordinating the independent cylinder combustion control under special working conditions of low-temperature cold start, high-speed dynamic property, rapid catalyst ignition and the like of the working cylinder, so that the performance requirement of an engine is met.
Specifically, the air inlet control assembly is arranged between an air inlet passage of the working cylinder and the single cylinder and used for adjusting air inlet amount in the single cylinder under different working conditions. The exhaust control assembly is connected with the working cylinder through a gas mixed flow device 9 on the air inlet passage, and is used for adjusting the amount of the exhaust gas entering the gas mixed flow device 9 under different working conditions, and supplementing the exhaust gas into the working cylinder for combustion through the gas mixed flow device 9.
In the following embodiments, the present invention will be specifically described with respect to the specific structures of the working cylinder and the individual cylinder.
For the working cylinders, the intake passage leads gas to each working cylinder and each working cylinder is itself provided with a high energy ignition 22.
An electric control supercharging component 2, a turbocharger 4 and a gas mixed flow device 9 are sequentially arranged on the air inlet passage according to the air inlet flow direction. In addition, the electronic control supercharging component 2 is connected with the supercharger adjusting one-way valve 3 in parallel, and the electronic control supercharging component 2 or the turbocharger 4 can be selectively used for supercharging under different working conditions under the action of the supercharger adjusting one-way valve 3. If the electrically controlled pressurizing assembly 2 is used for pressurizing, the pressurized gas is guided into the acting cylinder through the gas mixed flow device 9. If the electric control supercharging component 2 is used for supercharging, the turbocharger 4 is connected to the air inlet passage and is connected with the working cylinder, and the gas in the air inlet passage enters the working cylinder after being supercharged by the turbocharger 4, or is guided into the working cylinder through the gas mixing device 9 after being supercharged by the turbocharger 4. Further, the turbocharger 4 is also connected between an exhaust check valve and the front exhaust pipe 5. The detailed description of the specific connection structure will be described later.
The gas mixing device 9 is connected to the working cylinder through a working cylinder air throttle, and the working cylinder air throttle is used for adjusting the air input into the working cylinder.
As an alternative embodiment, an air cleaner 1 and a heat exchanger 24 are further provided in the intake passage. After being filtered by the air filter 1, the gas is pressurized by the electric control pressurizing assembly 2 or the turbocharger 4 according to working conditions, enters the cold-heat exchanger 24 to reduce pressure and then exhaust temperature, and enters the acting cylinder through the gas mixing device 9.
Various sensors are also arranged on the air inlet passage. For example, an air flow sensor 12 is provided behind the air cleaner 1, and a boost pressure sensor 17 and a first line oxygen sensor 18 are provided behind the turbocharger 4 in terms of the gas flow direction. A first temperature/pressure sensor 19 is arranged behind the power cylinder throttle 10.
For the single cylinder, the single cylinder can be a compression ignition single cylinder engine or a combustion single cylinder engine and is used for adjusting the air-fuel ratio of the mixer for combustion control.
An ignition system 23 and an intake manifold 21 are provided in the individual cylinders. Under the working condition, the ignition system 23 is selected to carry out combustion control, or the air inlet manifold 21 is selected to inject to assist the ignition system 23 to carry out enrichment combustion control together because enrichment combustion is needed under most working conditions. The ignition system 23 is high energy ignition, and/or electrophoretic ignition. Combustion of individual cylinders may later use electrophoretic ignition.
The single-cylinder air inlet control assembly comprises an air inlet branch passage and a single cylinder air throttle valve arranged on the branch passage, wherein the single cylinder air throttle valve is used for adjusting the air inlet amount of the single cylinder under different working conditions. Specifically, an intake direct current path is led out from between the cold heat exchanger and the gas mixing device 9 to the individual cylinder. Further, various sensors are arranged on the branch air inlet passage. A second temperature and pressure sensor 20 is arranged behind the individual cylinder throttle, based on the gas flow direction.
For an individual cylinder exhaust control assembly, the exhaust control assembly comprising: a first exhaust branch flow passage and a second exhaust branch flow passage. The first branch exhaust gas flow passage is provided between the single cylinder and the gas mixing device 9, and the second branch exhaust gas flow passage is derived by being branched from the first branch exhaust gas flow passage.
An exhaust gas circulation valve 8 is arranged on the first exhaust branch flow passage, and an exhaust check valve is arranged on the second exhaust branch flow passage. The exhaust check valve is provided with a water cooling passage.
Under different working conditions, the amount of the exhaust gas entering the gas mixing device 9 is adjusted through the exhaust gas circulating valve 8 and the exhaust check valve together.
More specifically, an exhaust gas heat exchange device 7 is further disposed on the first exhaust branch flow path, and exhaust gas discharged from the single cylinder is introduced into the gas mixing device 9 through the exhaust gas heat exchange device 7 and the exhaust gas circulation valve 8;
a front exhaust pipe 5 is provided in the second branch exhaust gas flow passage, and the exhaust gas guided from the first branch exhaust gas flow passage to the second branch exhaust gas flow passage is discharged through the exhaust check valve and the front exhaust pipe 5.
As an alternative embodiment, the turbocharger 4 is also connected between the exhaust check valve and the foreline exhaust pipe 5.
As an alternative embodiment, various sensors are disposed on the first exhaust branch flow passage and the second exhaust branch flow passage. Specifically, in the first exhaust gas bypass flow path, the second oxygen sensor 14 is provided in front of the exhaust gas heat exchange device 7 and the temperature sensor 15 is provided behind the second oxygen sensor, in accordance with the flow direction of the exhaust gas. A differential pressure sensor 16 is arranged on the exhaust gas recirculation valve 8 for measuring the differential pressure. In the second branch exhaust gas passage, an oxygen sensor 13 is provided between the turbocharger 4 and the front-stage exhaust pipe 5.
As an optional embodiment, the various sensors collect monitoring parameters under different working conditions and transmit the monitoring parameters to the controller, the controller calibrates data under different working conditions according to the monitoring parameters, adjusts the air intake of the working cylinder air throttle 10 and the single cylinder air throttle 11 according to the calibrated data, and adjusts the exhaust gas amount of the exhaust check valve and the exhaust gas circulation valve 8 according to the calibrated data.
Based on the structure, the specific principle of the embodiment of the invention is that for the requirements of the working cylinder under different working conditions, the air inlet control component of the single cylinder adjusts the air inlet amount according to the corresponding calibration data under the working condition, the single cylinder performs single combustion control according to the corresponding calibration data under the working condition according to the controller to generate the waste gas meeting the requirements, and the exhaust control component of the single cylinder adjusts the waste gas amount according to the corresponding calibration data under the working condition, guides the waste gas amount into the gas mixed flow device 9, mixes with the inlet air of the working cylinder, and then enters the working cylinder to participate in combustion, so that the combustion stability of the working cylinder is kept. Furthermore, in the process of adjusting the air inflow, the air throttle of the single cylinder adjusts the air inflow to participate in combustion according to the corresponding calibration data under the working condition. In the combustion process, the ignition system 23 is adjusted and selected according to the corresponding calibration data under the working condition, or the intake manifold 21 assists the ignition system 23 to perform combustion control together, so that exhaust gas meeting the requirement is generated. In the process of adjusting the gas output, the exhaust gas circulating valve 8 and the exhaust check valve jointly adjust the exhaust gas output according to the corresponding calibration data under the working condition.
The following describes the specific implementation principle of the present invention under various working conditions.
In a low-speed region of the engine, the engine may have problems of pre-ignition, knocking and the like, so that the working condition mainly solves the problem of unstable combustion of the engine and improves the responsiveness of the engine.
Under the working condition, for the working cylinder, under the low speed and low load, the invention is distributed on the air inlet passage according to the requirement in order to meet the quick response of the engine. Specifically, after being supercharged by the electronically-controlled supercharging assembly 2, the gas reaches a branch point through the turbocharger 4, the branch point is a connection point of the intake passage connected to the first branch intake passage, and the turbocharger 4 only serves as intake air at this time. (alternatively, if the cold-heat exchanger 24 is provided, the exhaust temperature can be reduced through the turbocharger 4 and the cold-heat exchanger 24 to reach the diversion stage), and the opening degree of the throttle valve of the special cylinder is adjusted according to the calibration data of the controller, so that the special cylinder is promoted to burn. Under the working condition, the air inlet manifold 21 of the special cylinder does not work, the high-energy ignition work of the special cylinder promotes the special cylinder to generate 1% hydrogen approximately, the exhaust gas of the cylinder is led into the gas mixing device 9 through the interaction of the exhaust gas circulating valve 8 and the exhaust check valve (optionally, if the exhaust gas heat exchange device 7 is arranged, the exhaust gas reaches the exhaust gas circulating valve 8 through the exhaust gas heat exchange device 7 and is led into the gas mixing device 9 through the interaction of the exhaust gas circulating valve 8 and the exhaust check valve), and the exhaust gas is mixed with the intake gas of the working cylinder and then enters the working cylinder to participate in combustion.
In the middle and high rotating speed area, according to the requirement of the combustion characteristic of the engine, the supercharger adjusting one-way valve 3 is opened, so that gas enters after being pressurized by the turbocharger 4, the temperature of the exhaust gas is reduced by the cold-heat exchanger 24 (certainly, the exhaust gas can directly reach the shunting stage after being pressurized), and according to the data calibrated by the controller, in the air inlet shunting stage, the working cylinder throttle valve and the single cylinder throttle valve are controlled to be opened, wherein the working cylinder throttle valve 10 of the main flow passage is in a full-open state. The individual cylinder throttle valves 11 on the branch passages are subjected to opening degree adjustment according to data calibrated by the controller. Under the working condition, the single cylinder needs to adopt over-enrichment combustion, so the cylinder needs the assistance of the intake manifold 21, the lamder of the cylinder is about 0.6 by the matching use of the intake manifold 21 and the combustion in the cylinder, and the H in the waste gas2The content of the (B) can reach more than 2.7 percent,H2the waste gas generated by the cylinder (after heat exchange through the waste gas heat exchange device 7) enters the gas mixing device 9 after the gas flow is adjusted through the interaction of the waste gas circulating valve 8 and the exhaust check valve, is fully mixed with the air entering through the acting cylinder throttle valve 10, and enters the acting cylinder to participate in combustion. The mixed gas contains a combustion stabilizer and a combustion catalyst, so that the working cylinder can keep lamder 1 stable combustion, the higher dynamic property and the higher combustion efficiency can be achieved by using less fuel injection quantity, the heat efficiency of the engine can be increased to about 45%, the effective utilization of the EGR rate of 33% is realized, and the fuel consumption is reduced by about 10%.
In the external characteristic region, the traditional exhaust gas circulation technology cannot basically use exhaust gas recirculation because the combustion stability of the engine cannot be controlled, and the invention uses the matching use of the double throttle valves, the bypass valve and the exhaust gas recirculation valve, so that the engine can also apply the exhaust gas recirculation technology in the external characteristic region, thereby reducing the exhaust temperature and optimizing the original emission of the engine on the premise of effectively improving the dynamic property. The implementation mode is as follows: in the outer characteristic region, the exhaust check valve is closed, the single cylinder throttle valve 11 is opened by a small opening degree according to the calibration data, the intake manifold 21 injection is closed, and the single cylinder throttle valve operates according to the calibration data of the controller, so that the cylinder produces approximately 1.2% of H2. Meanwhile, the waste gas contains a large amount of inert gas, the part of the waste gas containing the combustion stabilizer and the inert gas passes through the waste gas heat exchange device 7 and the waste gas circulating valve 8, is fully mixed with the air passing through the throttle valve 10 of the working cylinder in the gas mixing flow device 9, and then enters the working cylinder to participate in combustion, and at the moment, the waste gas contains the combustion stabilizer H2And inert gas, so that the traditional multi-fuel injection strategy is not used for controlling the external characteristic temperature, the combustion efficiency is improved under the condition of effectively reducing the fuel consumption on the external characteristic, the exhaust temperature of an engine system is reduced, and the dynamic property is improved.
The above is a detailed description of the structure and implementation principles of the engine system according to the embodiment of the present invention.
For the engine system of the embodiment of the invention, the independent cylinder is used for independent combustion control according to the working condition and is led into the acting cylinder to participate in combustion, the independent cylinder can be adjusted in time according to the technical development of the engine and is used for providing beneficial waste gas for the acting cylinder, the EGR rate of the gasoline engine can reach 33 percent stably, the heat efficiency of the special cylinder is improved according to the combustion stability, and the fuel consumption is reduced. The knocking of the engine controlled by the working cylinder can be effectively avoided, the compression ratio of the working cylinder is further improved, and the responsiveness of the engine is improved.
Furthermore, one cylinder of the engine system provided by the embodiment of the invention adopts independent air intake and exhaust control, the independent cylinder can be adjusted in time according to specific requirements in the performance area of the engine, and the independent cylinder can also be adaptively optimized according to the technical development, for example, the independent cylinder adopts ignition/compression ignition single cylinder control to supplement the performance requirements of the whole engine such as quick response and the like.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An engine system, characterized in that the engine comprises: the working cylinder and the independent cylinder are any one of original cylinders of the engine, and the working cylinder is a cylinder except the independent cylinder in the original cylinders of the engine;
the working cylinder is used for performing combustion working according to different working conditions of the engine;
the independent cylinder is used for carrying out independent combustion control according to the requirements of the working cylinder under different working conditions, and waste gas meeting the requirements is generated and supplemented into the working cylinder for combustion; wherein the individual cylinders are configured with individual intake and exhaust control assemblies; the air inlet control assembly is arranged between an air inlet passage of the working cylinder and the single cylinder and is used for adjusting the air inlet amount in the single cylinder under different working conditions; the exhaust control assembly is connected with the working cylinder through a gas mixed flow device on the air inlet passage, and is used for adjusting the amount of waste gas entering the gas mixed flow device under different working conditions and supplementing the waste gas into the working cylinder through the gas mixed flow device for combustion.
2. The engine system of claim 1, wherein an ignition system and an intake manifold are disposed in the individual cylinders;
and under different working conditions, selecting the ignition system to perform combustion control, or selecting the intake manifold to assist the ignition system to perform enrichment combustion control together.
3. The engine system of claim 2, wherein the intake control assembly comprises: the air conditioner comprises a branch air inlet passage and an individual cylinder air throttle arranged on the branch air passage, wherein the individual cylinder air throttle is used for adjusting the air inlet amount of an individual cylinder under different working conditions.
4. The engine system of claim 3, wherein the exhaust control assembly comprises: a first exhaust branch flow passage and a second exhaust branch flow passage; the first branch exhaust flow passage is arranged between the single cylinder and the gas mixing device, and the second branch exhaust flow passage is obtained by diversion of the first branch exhaust flow passage;
an exhaust gas circulation valve is arranged on the first exhaust branch passage, and an exhaust check valve is arranged on the second exhaust branch passage;
under different working conditions, the amount of the exhaust gas entering the gas mixing device is adjusted through the exhaust gas circulating valve and the exhaust check valve together.
5. The engine system of claim 4, wherein the intake passage, the branch intake passage, the first branch exhaust passage, and the second branch exhaust passage are provided with sensors of various types.
6. The engine system of claim 4, wherein the exhaust check valve is provided with a water cooling passage.
7. The engine system according to claim 4, wherein an exhaust gas heat exchanging device is further provided in the first exhaust branch flow path, and exhaust gas discharged from the individual cylinder is introduced into the gas mixing device through the exhaust gas heat exchanging device and the exhaust gas circulation valve;
the second exhaust branch flow passage is provided with a front exhaust pipe, and the exhaust gas guided from the first exhaust branch flow passage to the second exhaust branch flow passage is discharged through the exhaust check valve and the front exhaust pipe.
8. The engine system of claim 1, wherein the single cylinder is a compression ignition single cylinder engine or an ignition single cylinder engine.
9. The engine system of claim 2, wherein the ignition system is high energy ignition, and/or electrophoretic ignition.
10. The engine system of claim 5, further comprising: a turbocharger;
the turbocharger is connected between the air inlet passage and the working cylinder, and air in the air inlet passage enters the working cylinder through the turbocharger according to different working conditions or enters the working cylinder through the air flow mixing device;
the turbocharger is also connected between the exhaust check valve and the preceding stage exhaust pipe.
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| CN202110676859.4A CN113417748A (en) | 2021-06-18 | 2021-06-18 | Engine system |
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| CN202110676859.4A CN113417748A (en) | 2021-06-18 | 2021-06-18 | Engine system |
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Application publication date: 20210921 |