CN110206641B - Compression ignition engine and method for realizing low-temperature combustion mode thereof - Google Patents
Compression ignition engine and method for realizing low-temperature combustion mode thereof Download PDFInfo
- Publication number
- CN110206641B CN110206641B CN201910353061.9A CN201910353061A CN110206641B CN 110206641 B CN110206641 B CN 110206641B CN 201910353061 A CN201910353061 A CN 201910353061A CN 110206641 B CN110206641 B CN 110206641B
- Authority
- CN
- China
- Prior art keywords
- pressure
- exhaust gas
- low
- pipeline
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/02—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being water or steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
- F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
-
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/028—Adding water into the charge intakes
-
- 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
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- 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
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- 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
Abstract
A compression ignition engine and method of implementing a low temperature combustion mode thereof, comprising: step A, acquiring a first pressure difference between a front exhaust pipeline of a pressurizing unit and a rear intake pipeline of the pressurizing unit and a second pressure difference between the rear exhaust pipeline of the pressurizing unit and the front intake pipeline of the pressurizing unit; step B, judging whether the first pressure difference is positive, introducing the exhaust gas into the air inlet in a high-pressure exhaust gas recirculation mode until low-temperature combustion is realized, and executing one of the steps C1 or C2 if the first pressure difference is reduced to 0 and the low-temperature combustion is not realized; if the first pressure difference is negative, directly executing one of the steps C1 or C2; step C1, introducing waste gas into the intake air in a low-pressure waste gas recirculation mode until low-temperature combustion is realized, and introducing water into the intake air when the second pressure difference is reduced to 0 and the low-temperature combustion is not realized, and gradually increasing the water diversion amount until the low-temperature combustion is realized; step C2 introduces water into the intake air, gradually increasing the amount of water drawn until low temperature combustion is achieved.
Description
Technical Field
The invention relates to the field of internal combustion engines, in particular to a compression ignition engine and a method for realizing a low-temperature combustion mode thereof.
Background
The traditional diesel engine combustion belongs to diffusion combustion of spray combustion, and the mixed gas is ignited by means of the high temperature when the piston of the engine is compressed to be close to the end point. Because the mixing time of the spray and the air is short, the fuel oil and the air are mixed seriously and unevenly, and the mixed gas is divided into a high-temperature over-concentration area and a high-temperature flame area when being combusted. In the high temperature over-rich region, a large amount of soot is generated due to oxygen deficiency, wherein a portion of the soot is oxidized in a subsequent process. The oxygen content in the high-temperature flame zone is sufficient and the temperature can reach 2200K, and finally a large amount of NO is causedxAnd (4) generating. Thus, soot and NO in conventional diesel combustionxEmissions are almost unavoidable. In recent years, under the pressure of energy and environment, researchers are continuously searching for a high-efficiency clean combustion mode, wherein a low-temperature combustion mode is a novel combustion mode. Equivalence ratio-temperature history curves in low temperature combustion mode avoid soot-passing NOxThe generation area of the heat exchanger enables harmful emission to be close to 0, and meanwhile, the lower temperature of the working medium in the low-temperature combustion mode reduces the wall heat transfer quantity, so that the heat exchanger has higher heat efficiency. The low temperature combustion mode has the potential to achieve efficient clean combustion at part load.
Although the low-temperature combustion mode is a promising combustion mode, the combustion mode has the following defects:
1. from the technical means of realizing the low temperature process, the Exhaust Gas Recirculation (EGR) technology is one of the technologies mainly adopted for realizing the low temperature combustion, and the NO inhibition can be simultaneously obtained by reasonably using the large EGR ratexAnd the effect of soot generation. The exhaust gas enters the engine cylinder from the exhaust pipe, the pressure of the exhaust pipe is required to be larger than that of the air inlet pipe, a large proportion of exhaust gas recirculation rate is difficult to realize in the actual engine, and low-pressure exhaust gas recirculation and high-pressure exhaust gas recirculation are combined for use, wherein the low-pressure exhaust gas recirculation and the high-pressure exhaust gas recirculation are used for introducing the exhaust gas into the air inlet according to the air taking positionThe two modes of gas are low-pressure exhaust gas recirculation, namely, the exhaust gas is led out from an exhaust pipeline behind a turbine to an air inlet pipeline in front of a compressor of the supercharger, and the high-pressure exhaust gas recirculation refers to the exhaust gas is led out from an exhaust pipeline in front of the turbine of the supercharger to an air inlet pipeline behind the compressor.
2. The low temperature combustion mode has a limited operating load. According to literature reports, in the prior art, a low-temperature combustion mode of diesel oil is expanded to an average indicated pressure of 1.1MPa load on a single cylinder engine, and the average indicated pressure of external characteristics of the diesel engine is about 2-3 MPa generally. Therefore, the low-temperature combustion mode is only limited to medium and small loads, and the expansion of the operation load of the low-temperature combustion mode is also one of the research directions of academia.
The low-temperature combustion mode has two reasons that the running load is difficult to expand on the actual engine: (1) with the increase of the load, on one hand, the fuel entering the cylinder is increased, and in order to ensure the combustion efficiency, excessive waste gas is theoretically not allowed to enter the cylinder to replace fresh air; on the other hand, the pressure of an exhaust pipe and the pressure of an air inlet pipe of the engine are gradually reduced, the exhaust gas can not be introduced gradually by high-pressure exhaust gas recirculation, the exhaust back pressure is increased by simply adopting low-pressure exhaust gas recirculation, the fuel economy of the engine is reduced, and therefore a large proportion of EGR can not be introduced; (2) along with the increase of the load of an engine, the energy entering a cylinder is increased, the temperature in the cylinder is continuously increased, the temperature of a combustion boundary is increased, meanwhile, enough exhaust gas dilution air cannot be introduced, the slow burning period of diesel oil is too short, fuel cannot be mixed with fresh air, the high equivalent ratio in the combustion process can pass through a soot generation area, and NO can be achieved more easilyxGeneration area of soot and NO, hard to realizexLow emission.
Disclosure of Invention
In view of the above, it is a primary object of the present invention to provide a compression ignition engine and a method of implementing a low temperature combustion mode thereof, which is intended to at least partially solve at least one of the above mentioned technical problems.
The above purpose of the invention is realized by the following technical scheme:
as one aspect of the present invention, there is provided a method of implementing a low temperature combustion mode in a compression ignition engine, step a: acquiring a first pressure differential between the exhaust conduit and the intake conduit, and a second pressure differential between the exhaust conduit and the intake conduit, on a compression ignition engine comprising an engine block, the intake conduit, the exhaust conduit, and a supercharging unit; the supercharging device comprises an air inlet pipeline, an air outlet pipeline, a supercharging unit and a control unit, wherein the air inlet pipeline is used for providing air inlet for the engine body, the air outlet pipeline is used for discharging exhaust gas generated by the engine body, and the supercharging unit is arranged between the air outlet pipeline and the air inlet pipeline and is used for recovering energy of the discharged exhaust gas and increasing air inlet pressure;
and B: judging whether the first pressure difference is positive or not, if so, judging that the first pressure difference is positive
Leading the exhaust gas from the exhaust pipeline in front of the supercharging unit to the intake pipeline behind the supercharging unit by using a high-pressure exhaust gas recirculation mode so as to lead the exhaust gas in the intake air until a low-temperature combustion mode is realized, and alternatively executing the step C1 or the step C2 when the first pressure difference is gradually reduced to 0 and the low-temperature combustion mode is not realized;
judging whether the first pressure difference is negative or not, if so, judging that the first pressure difference is negative
Directly selecting to execute step C1 or C2;
step C1: leading out waste gas from an exhaust pipeline behind the supercharging unit to an air inlet pipeline in front of the supercharging unit in a low-pressure waste gas recirculation mode so as to introduce the waste gas into the inlet air until a low-temperature combustion mode is realized, and when the second pressure difference is gradually reduced to 0 and the low-temperature combustion mode is not realized, introducing water into the inlet air and gradually increasing the water diversion amount until the low-temperature combustion mode is realized;
step C2: water is introduced into the intake air and the amount of water drawn is gradually increased until a low temperature combustion mode is achieved.
As another aspect of the present invention, there is provided a compression ignition engine implementing a low temperature combustion mode, the compression ignition engine including an engine body, an intake duct, an exhaust duct, a supercharging unit, a low pressure exhaust gas recirculation duct, a high pressure exhaust gas recirculation duct, a water injection unit, and an electric control unit, wherein:
an intake duct, an output end of which is connected to the engine body, for supplying intake air to the engine body;
an exhaust duct, an input end of which is connected to the engine body, for discharging exhaust gas generated by the engine body;
the supercharging unit is arranged between the exhaust pipeline and the air inlet pipeline and used for recovering the energy of the exhaust gas output by the engine body and improving the air inlet pressure;
the input end of the low-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline behind the supercharging unit, the output end of the low-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline in front of the supercharging unit, and a low-pressure exhaust gas recirculation electric control valve is arranged on the low-pressure exhaust gas recirculation pipeline;
the input end of the high-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline in front of the supercharging unit, the output end of the high-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline behind the supercharging unit, and a high-pressure exhaust gas recirculation electric control valve is arranged on the high-pressure exhaust gas recirculation pipeline;
a water spray unit disposed in the intake duct behind the high-pressure exhaust gas recirculation duct for introducing water into the intake air;
and the electronic control unit is used for acquiring a first pressure difference between an exhaust pipeline in front of the supercharging unit and an air inlet pipeline behind the supercharging unit and a second pressure difference between the exhaust pipeline behind the supercharging unit and the air inlet pipeline in front of the supercharging unit, and controlling the supercharging unit, the low-pressure exhaust gas recirculation electronic control valve, the high-pressure exhaust gas recirculation electronic control valve and the water spraying unit according to the first pressure difference and the second pressure difference, so that the method for realizing the low-temperature combustion mode of the compression ignition engine is executed.
Based on the technical scheme, the invention has the beneficial effects that:
the invention provides a method for realizing a low-temperature combustion mode by combining exhaust gas recirculation and water spraying, which can replace part of exhaust gas recirculation, effectively broaden the operating load range of the low-temperature combustion mode, improve the thermal efficiency of an engine and simultaneously keep the low emission characteristic of the low-temperature combustion mode.
Drawings
Fig. 1 is a schematic structural view of a compression ignition engine that realizes a low temperature combustion mode according to an embodiment of the present invention.
In the above drawings, the reference numerals have the following meanings:
1. an air intake duct; 2. a water sprayer; 3. a one-way valve; 4. an air intake intercooler; 5. a high pressure exhaust gas recirculation cooler; 6. a high pressure exhaust gas recirculation electrically controlled valve; 7. an air inlet; 8. a low pressure exhaust gas recirculation conduit; 9. a low pressure exhaust gas recirculation cooler; 10. a particle trap; 11. a low pressure exhaust gas recirculation electrically controlled valve; 12. a pressurization system; 13. an exhaust port; 14. an exhaust duct; 15. an engine body; 16. a high pressure exhaust gas recirculation conduit.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
According to some embodiments of the invention there is provided a method of implementing a low temperature combustion mode in a compression ignition engine, comprising the steps of:
step A: acquiring a first pressure differential between the exhaust conduit and the intake conduit, and a second pressure differential between the exhaust conduit and the intake conduit, on a compression ignition engine comprising an engine block, the intake conduit, the exhaust conduit, and a supercharging unit; the supercharging device comprises an air inlet pipeline, an air outlet pipeline, a supercharging unit and a control unit, wherein the air inlet pipeline is used for providing air inlet for the engine body, the air outlet pipeline is used for discharging exhaust gas generated by the engine body, and the supercharging unit is arranged between the air outlet pipeline and the air inlet pipeline and is used for recovering energy of the discharged exhaust gas and increasing air inlet pressure;
and B: judging whether the first pressure difference is positive, if so, generally corresponding to the working conditions of low speed and small load and high speed and large load at the moment
Leading the exhaust gas from the exhaust pipeline in front of the supercharging unit to the intake pipeline behind the supercharging unit by using a high-pressure exhaust gas recirculation mode so as to lead the exhaust gas in the intake air until a low-temperature combustion mode is realized, and alternatively executing the step C1 or the step C2 when the first pressure difference is gradually reduced to 0 and the low-temperature combustion mode is not realized;
judging whether the first pressure difference is negative, if so, generally corresponding to the working condition of medium load or low speed and large load, and then judging whether the first pressure difference is negative or not
Directly selecting to execute step C1 or C2;
step C1: leading out waste gas from an exhaust pipeline behind the supercharging unit to an air inlet pipeline in front of the supercharging unit in a low-pressure waste gas recirculation mode so as to introduce the waste gas into the inlet air until a low-temperature combustion mode is realized, and when the second pressure difference is gradually reduced to 0 and the low-temperature combustion mode is not realized, introducing water into the inlet air and gradually increasing the water diversion amount until the low-temperature combustion mode is realized;
step C2: water is introduced into the intake air and the amount of water drawn is gradually increased until a low temperature combustion mode is achieved.
The water intake amount in the air intake of the compression ignition engine has the maximum limit value, and when the water intake amount reaches the maximum limit value, the relative humidity of the air intake in the compression ignition engine reaches 100 percent, namely the air intake is saturated humid air or a mixture of the saturated humid air and the introduced waste gas. If the water diversion quantity makes the relative humidity reach more than 100%, water drops appear in the air inlet, and the friction loss of the engine is increased.
Wherein, the maximum limit value of the water diversion amount is expressed by the following formula:
M＝(d′×(x-x×d0×φ/1000)-x×d0×φ)；
m is the maximum water diversion amount, and the unit is g/h; x is the mass flow of fresh air entering the compressor end of the compression ignition engine, and the unit is kg/h; d0Atmospheric pressure of the external environment is P0Temperature of T0The moisture content of saturated humid air in g/kg; phi is atmospheric pressure P0Temperature of T0The relative humidity of the air, d ' is the saturated humid air moisture content in g/kg at an intake air temperature T ' and an intake air pressure P '. The corresponding moisture content of the saturated humid air under different temperature and pressure is standard data, and can be found in formula calculation in an ASHRAE manual or standard data of the thermophysical property of the humid air.
The mode of introducing water into the air inlet of the compression ignition engine is single-point or multi-point air passage water spraying or air inlet humidifying.
There is also provided, in accordance with some embodiments of the present invention, a compression ignition engine implementing a low temperature combustion mode, including an engine body, an intake duct, an exhaust duct, a supercharging unit, a low pressure exhaust gas recirculation duct, a high pressure exhaust gas recirculation duct, a water injection unit, and an electronic control unit, wherein: an intake duct, an output end of which is connected to the engine body, for supplying intake air to the engine body; an exhaust duct, an input end of which is connected to the engine body, for discharging exhaust gas generated by the engine body; the supercharging unit is arranged between the exhaust pipeline and the air inlet pipeline and used for recovering the energy of the exhaust gas output by the engine body and improving the air inlet pressure; the input end of the low-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline behind the supercharging unit, the output end of the low-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline in front of the supercharging unit, and a low-pressure exhaust gas recirculation electric control valve is arranged on the low-pressure exhaust gas recirculation pipeline; the input end of the high-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline in front of the supercharging unit, the output end of the high-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline behind the supercharging unit, and a high-pressure exhaust gas recirculation electric control valve is arranged on the high-pressure exhaust gas recirculation pipeline; a water spray unit disposed in the intake duct behind the high-pressure exhaust gas recirculation duct for introducing water into the intake air; and the electronic control unit is used for acquiring a first pressure difference between an exhaust pipeline in front of the supercharging unit and an air inlet pipeline behind the supercharging unit and a second pressure difference between the exhaust pipeline behind the supercharging unit and the air inlet pipeline in front of the supercharging unit, and controlling the supercharging unit, the low-pressure exhaust gas recirculation electronic control valve, the high-pressure exhaust gas recirculation electronic control valve and the water spraying unit according to the first pressure difference and the second pressure difference, so that the method for realizing the low-temperature combustion mode of the compression ignition engine is executed.
Wherein, the high-pressure waste gas recirculation pipeline is also provided with a one-way valve and a high-pressure waste gas recirculation cooler;
wherein, the low-pressure exhaust gas recirculation pipeline is also provided with a particle catcher and a low-pressure exhaust gas recirculation cooler; an air inlet cooler is also arranged on the air inlet pipeline behind the air compressor.
Wherein, the supercharging unit adopts turbocharging. When turbocharging is adopted, the supercharging unit comprises a turbine and a compressor, wherein: the turbine is arranged on the exhaust pipeline and is pushed by the inertia impulse of the exhaust gas discharged by the exhaust pipeline; and the air compressor is arranged on the air inlet pipeline and used for improving the air inlet pressure.
The technical solution of the present invention is further illustrated by the following preferred embodiments:
as shown in fig. 1, the present embodiment provides a diesel engine, which includes, as an example of an internal combustion engine, an engine body 15, an intake duct 1, an exhaust duct 14, a supercharging unit, a low-pressure exhaust gas recirculation duct 8, a high-pressure exhaust gas recirculation duct 16, a water spray unit, and an electronic control unit.
An engine body 15 including basic components of the diesel engine such as a combustion unit, a crankshaft link mechanism, and a valve mechanism, which are not described herein;
an air intake duct 1, the output end of which is connected to an engine body 15, for supplying intake air to the engine body 15 of the diesel engine; an exhaust duct 14, an input end of which is connected to the engine body 15, for discharging exhaust gas generated by the engine body 15 of the diesel engine;
the supercharging unit 12 is configured to recover energy of high-temperature and high-pressure exhaust gas discharged from the engine body 15 and increase intake pressure of fresh air, and implements multiple modes such as single-stage supercharging, two-stage supercharging, and composite supercharging, as shown in fig. 1, the supercharging unit is only a schematic diagram of single-stage turbocharging, and specifically includes a turbine and a compressor, wherein the turbine is arranged on the exhaust pipeline 14, and the compressor is arranged on the intake pipeline 1;
a low-pressure exhaust gas recirculation pipe 8, the input end of which is connected to the exhaust pipe 14 behind the turbine and the output end of which is connected to the air inlet pipe 1 in front of the compressor, thereby forming a low-pressure exhaust gas recirculation loop between the air inlet 7 and the air outlet 13;
wherein a low-pressure exhaust gas recirculation cooler 9 is arranged on the low-pressure exhaust gas recirculation line 8, which functions to cool the exhaust gas of the low-pressure exhaust gas recirculation circuit; the particle catcher 10 is arranged on the low-pressure exhaust gas recirculation pipeline 8 and has the function of catching particulate matters in the exhaust gas and preventing the particulate matters from entering a pressurizing unit after being mixed with fresh air to damage blades of the compressor; the low-pressure exhaust gas recirculation electric control valve 11 is arranged on the low-pressure exhaust gas recirculation pipeline 8 and has the function of controlling the opening of the valve so as to control the low-pressure exhaust gas recirculation rate;
a high-pressure exhaust gas recirculation pipe 16, the input end of which is connected to the exhaust pipe 14 before the turbine and the output end of which is connected to the intake pipe 1 after the compressor, thereby forming a high-pressure exhaust gas recirculation loop between the intake port 7 and the exhaust port 13;
wherein, the check valve 3 is arranged on the high-pressure exhaust gas recirculation pipeline 16, and the main function of the check valve is to prevent the backflow of the inlet air; the intake air cooler 4 is arranged on the intake duct 1, and has a main function of cooling the intake air after the supercharging unit 12 supercharges the intake air, so that the charging efficiency of the cylinders in the engine body 15 is prevented from being reduced due to the overhigh temperature of the intake air; the high-pressure exhaust gas recirculation cooler 5 is provided on the high-pressure exhaust gas recirculation pipe 16, and functions to cool the high-temperature exhaust intake air of the engine; the high-pressure exhaust gas recirculation electronic control valve 6 is arranged on the high-pressure exhaust gas recirculation pipeline 16 and has the function of controlling the opening of the valve so as to control the recirculation rate of the high-pressure exhaust gas;
a water spray unit, which comprises a water tank, a water pump, a water pipe, a water sprayer 2 and other matched devices, wherein the water sprayer 2 is only marked in fig. 1, and has the main function of spraying water into the air inlet pipeline 1 to be mixed with fresh air and is positioned behind the high-pressure exhaust gas recirculation pipeline;
an electronic control unit, not shown in fig. 1, for controlling the pressurization unit, the low-pressure exhaust gas recirculation electronic control valve, the high-pressure exhaust gas recirculation electronic control valve, and the water injection unit according to a first pressure difference between the exhaust duct 14 before the turbine and the intake duct 1 after the compressor, and a second pressure difference between the exhaust duct 14 after the turbine and the intake duct 1 before the compressor, so as to implement the following method for implementing the low-temperature combustion mode:
when the pressure of the exhaust pipeline in front of the turbine of the engine is larger than the air inlet pressure, the high-pressure exhaust gas recirculation is favorably introduced. Gradually opening the high-pressure egr electrically controlled valve 6 introduces the exhaust gas by using high-pressure egr to reduce pumping loss, and after the high-pressure egr introduces the exhaust gas to the limit, that is, when the first pressure difference gradually decreases to 0, if low-temperature combustion has not been achieved, the operation can be selected from the following operations: 1. gradually opening the low-pressure exhaust gas recirculation electric control valve 11 to continuously introduce the exhaust gas, and after the capability of introducing the exhaust gas through low-pressure exhaust gas recirculation reaches the limit, namely when the second pressure difference is gradually reduced to 0, if the low-temperature combustion is not realized, spraying water by using the water sprayer 2 in the air inlet pipeline 1, and gradually increasing the water spraying amount until the low-temperature combustion mode is realized; 2. the water sprayer 2 is directly used for spraying water in the air inlet pipeline 1, and the water spraying amount is gradually increased until a low-temperature combustion mode is realized.
When the pressure of an exhaust pipeline and the pressure of inlet air in front of a turbine of the engine are basically equal, high-pressure exhaust gas recirculation cannot be introduced. To achieve the low temperature combustion mode, one can choose among the following operations: 1. gradually opening the low-pressure exhaust gas recirculation electric control valve 11 to introduce exhaust gas, and after the capability of introducing exhaust gas through low-pressure exhaust gas recirculation reaches the limit, namely the second pressure difference is gradually reduced to 0, if low-temperature combustion is not realized, spraying water by using a water sprayer 2 in the air inlet pipeline 1, and gradually increasing the water spraying amount until a low-temperature combustion mode is realized; 2. water is sprayed in the intake duct 1 using the water sprayer 2, and the amount of water spray is gradually increased until a low-temperature combustion mode is realized.
Wherein the performance of the engine is influenced by the introduction of water as follows: (1) because the latent heat of vaporization and the specific heat capacity of water are large, the combustion temperature in the cylinder is reduced due to the evaporation of the water, and meanwhile, the water vapor also participates in acting, so that the heat efficiency of the engine is improved; (2) most of emulsified diesel oil is a water-in-oil morphological system, and the boiling point of water is lower than that of diesel oil, so that along with the rapid rise of temperature, water can be evaporated from the diesel oil firstly and oil particles are crushed, thus causing the micro-explosion phenomenon and enhancing the atomization effect; (3) the oxidation reaction of diesel oil can generate a large amount of activated carbon atoms and hydrocarbon, and then the activated carbon atoms and the hydrocarbon are further polymerized, crystallized, expanded and adsorbed to form soot, however, water vapor can generate water gas reaction with the substances at high temperature, the reaction can not only eliminate the generation inducement of soot, but also generate hydrogen, and as the maximum flame propagation speed of the hydrogen is 9 times of that of the diesel oil, the wall quenching and slit effect can be greatly relieved after the fuel is hydrogenated, thereby being beneficial to improving the combustion of an engine and the generation of incomplete combustion products.
However, there is a very serious problem with in-cylinder water-blended combustion: if liquid water drops exist in the cylinder, the water drops can collide with the wall surface of the cylinder to dilute lubricating oil on the wall surface of the cylinder, so that the friction loss of the engine is increased, and the abrasion of the wall surface of the cylinder of the engine can be caused more seriously.
Thus, the applicant further proposes that the maximum diversion amount in the intake air is that the intake air of the compression ignition engine is all saturated humid air or a mixture of the saturated humid air and the introduced exhaust gas, so as to solve the problem of liquid drop impact, and the maximum diversion amount is expressed by the following formula:
M＝(d′×(x-x×d0×φ/1000)-x×d0×φ)；
wherein M is the maximum water diversion amount and the unit is g/h; x is the mass flow of fresh air entering the compressor end of the compression ignition engine, and the unit is kg/h; d0Atmospheric pressure of the external environment is P0Temperature of T0The moisture content of saturated humid air in g/kg; phi is atmospheric pressure P0Temperature of T0The relative humidity of the air; d ' is the saturated humid air moisture content in g/kg at an intake air temperature T ' and an intake air pressure P '.
The invention focuses on a strategy of realizing low-temperature combustion by combining EGR and water injection, the application of the invention is not limited to the device shown in the attached drawing of the invention, and the combustion control based on the gist of the invention is within the protection scope of the invention.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method of achieving a low temperature combustion mode in a compression ignition engine comprising an engine block, an intake conduit, an exhaust conduit and a supercharging unit, wherein:
the intake duct is for supplying intake air to the engine body,
the exhaust duct is for discharging exhaust gas generated by the engine body, an
The supercharging unit comprises a turbine and a compressor, wherein:
a turbine disposed on the exhaust duct and driven by an inertial impulse of exhaust gas discharged from the exhaust duct;
the air compressor is arranged on the air inlet pipeline and used for improving the air inlet pressure;
the method comprises the following steps:
step A: acquiring a first pressure difference between an exhaust pipeline in front of a turbine and an air inlet pipeline behind an air compressor and a second pressure difference between the exhaust pipeline behind the turbine and the air inlet pipeline in front of the air compressor on the compression ignition engine;
and B: judging whether the first pressure difference is positive or not, if so, judging that the first pressure difference is positive
Leading the exhaust gas out of an exhaust pipeline in front of the turbine to an air inlet pipeline behind the compressor by using a high-pressure exhaust gas recirculation mode so as to lead the exhaust gas into the air inlet until a low-temperature combustion mode is realized, and alternatively executing the step C1 or the step C2 when the low-temperature combustion mode is not realized when the first pressure difference is gradually reduced to 0;
judging whether the first pressure difference is negative or not, if so, judging that the first pressure difference is negative
Directly selecting to execute step C1 or C2;
step C1: leading out waste gas from an exhaust pipeline behind the turbine to an air inlet pipeline in front of the compressor in a low-pressure waste gas recirculation mode so as to introduce the waste gas into the air until a low-temperature combustion mode is realized, and when the second pressure difference is gradually reduced to 0 and the low-temperature combustion mode is not realized, introducing water into the air inlet and gradually increasing the water diversion amount until the low-temperature combustion mode is realized;
step C2: water is introduced into the intake air and the amount of water drawn is gradually increased until a low temperature combustion mode is achieved.
2. The method according to claim 1, characterized in that the intake air of the compression ignition engine has a maximum value of water intake, when the amount of water intake reaches the maximum value, the relative humidity of the intake air in the compression ignition engine reaches 100%.
3. The method according to claim 2, characterized in that the maximum limit value of the priming volume is expressed by the following formula:
M＝(d′×(x-x×d0×φ/1000)-x×d0×φ)；
wherein M is the maximum water diversion amount and the unit is g/h; x is the mass flow of fresh air entering the compressor end of the compression ignition engine, and the unit is kg/h; d0Atmospheric pressure of the external environment is P0Temperature of T0The moisture content of saturated humid air in g/kg; phi is atmospheric pressure P0Temperature of T0The relative humidity of the air; d ' is the saturated humid air moisture content in g/kg at an intake air temperature T ' and an intake air pressure P '.
4. The method according to claim 1, characterized in that the water is introduced into the intake air of the compression ignition engine by means of single-point or multi-point port water injection or intake air humidification.
5. A compression ignition engine for implementing a low temperature combustion mode, comprising an engine body, an intake conduit, an exhaust conduit, a supercharging unit, a low pressure exhaust gas recirculation conduit, a high pressure exhaust gas recirculation conduit, a water injection unit and an electronic control unit, wherein:
an intake duct, an output end of which is connected to the engine body, for supplying intake air to the engine body;
an exhaust duct, an input end of which is connected to the engine body, for discharging exhaust gas generated by the engine body;
the supercharging unit is arranged between the exhaust pipeline and the air inlet pipeline, comprises a turbine and a compressor, wherein the turbine is arranged on the exhaust pipeline and is pushed by the inertia impulse of the exhaust gas discharged by the exhaust pipeline; the air compressor is arranged on the air inlet pipeline and used for improving the air inlet pressure;
the input end of the low-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline behind the turbine, the output end of the low-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline in front of the compressor, and a low-pressure exhaust gas recirculation electric control valve is arranged on the low-pressure exhaust gas recirculation pipeline;
the input end of the high-pressure exhaust gas recirculation pipeline is connected to the exhaust pipeline in front of the turbine, the output end of the high-pressure exhaust gas recirculation pipeline is connected to the air inlet pipeline behind the compressor, and a high-pressure exhaust gas recirculation electric control valve is arranged on the high-pressure exhaust gas recirculation pipeline;
a water spray unit disposed in the intake duct behind the high-pressure exhaust gas recirculation duct for introducing water into the intake air;
an electronic control unit for obtaining a first pressure difference between an exhaust pipeline in front of the turbine and an air inlet pipeline in back of the compressor and a second pressure difference between the exhaust pipeline in back of the turbine and the air inlet pipeline in front of the compressor, and controlling the pressurization unit, the low-pressure exhaust gas recirculation electronic control valve, the high-pressure exhaust gas recirculation electronic control valve and the water injection unit according to the first pressure difference and the second pressure difference so as to execute the method for realizing the low-temperature combustion mode of the compression ignition engine according to any one of claims 1 to 4.
6. The compression ignition engine of claim 5, wherein:
the high-pressure waste gas recirculation pipeline is also provided with a one-way valve and a high-pressure waste gas recirculation cooler;
the low-pressure exhaust gas recirculation pipeline is also provided with a particle trap and a low-pressure exhaust gas recirculation cooler;
and an air inlet cooler is also arranged on the air inlet pipeline behind the air compressor.
7. The compression ignition engine of claim 5, wherein the water injection unit further comprises a water tank, a water pipe, a water pump, and a water injector, wherein:
a water pipe, the input end of which is connected to the water tank, and the output end of which is connected to the water sprayer, and used for conveying the water in the water tank to the water sprayer;
the water pump is arranged on the water pipe and provides power for water conveying;
and the water sprayer is arranged on the air inlet pipeline and used for spraying water into the air inlet.
8. The compression ignition engine as claimed in any one of claims 5 to 7, which is a diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353061.9A CN110206641B (en) | 2019-04-29 | 2019-04-29 | Compression ignition engine and method for realizing low-temperature combustion mode thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353061.9A CN110206641B (en) | 2019-04-29 | 2019-04-29 | Compression ignition engine and method for realizing low-temperature combustion mode thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110206641A CN110206641A (en) | 2019-09-06 |
| CN110206641B true CN110206641B (en) | 2021-04-02 |
Family
ID=67786650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910353061.9A Active CN110206641B (en) | 2019-04-29 | 2019-04-29 | Compression ignition engine and method for realizing low-temperature combustion mode thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110206641B (en) |
Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005076456A (en) * | 2003-08-29 | 2005-03-24 | Toyota Motor Corp | Internal combustion engine |
| US6973786B1 (en) * | 2004-10-12 | 2005-12-13 | International Engine Intellectual Property Company, Llc | Emission reduction in a diesel engine by selective use of high-and low-pressure EGR loops |
| CN1871412A (en) * | 2003-09-19 | 2006-11-29 | 美国环境保护署 | Low emission diesel combustion system with low charge-air oxygen concentration levels and high fuel injection pressures |
| CN101592090A (en) * | 2009-07-14 | 2009-12-02 | 天津大学 | A kind of method and device thereof that reduces emission of diesel engine for light vehicle |
| CN102889147A (en) * | 2012-09-26 | 2013-01-23 | 天津大学 | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine |
| CN103061909A (en) * | 2013-01-07 | 2013-04-24 | 天津大学 | Method for improving low-temperature combustion soot emission and fuel economy of diesel engine |
| CN103189633A (en) * | 2010-11-04 | 2013-07-03 | 戴姆勒股份公司 | Motor-vehicle internal combustion engine with exhaust-gas recirculation |
| CN103195595A (en) * | 2013-04-01 | 2013-07-10 | 天津大学 | External inlet air heating and internal exhaust gas recirculation (EGR) strategy cooperative control method |
| KR20150111048A (en) * | 2014-03-25 | 2015-10-05 | 두산인프라코어 주식회사 | Engine system for low temperature combustion in diesel engine |
| CN105339641A (en) * | 2013-06-28 | 2016-02-17 | 丰田自动车株式会社 | Control device for internal combustion engine |
| CN105386858A (en) * | 2014-08-28 | 2016-03-09 | 现代自动车株式会社 | Engine system |
| CN106321269A (en) * | 2016-08-22 | 2017-01-11 | 天津大学 | Method for controlling diluent or lean mixed gas burning and ignition through high-flammability fuel micro ignition |
| CN106368857A (en) * | 2015-07-24 | 2017-02-01 | 福特环球技术公司 | A variable exhaust gas recirculation diffuser |
| JP2017075608A (en) * | 2016-12-16 | 2017-04-20 | 三菱自動車エンジニアリング株式会社 | Egr gas condensate water treatment device |
| CN106939839A (en) * | 2015-12-14 | 2017-07-11 | 通用汽车环球科技运作有限责任公司 | The method of explosive motor of the operation with turbocharger |
| CN106958500A (en) * | 2016-01-12 | 2017-07-18 | 福特环球技术公司 | The direct injection boosting explosive motor and its operating method sprayed with water |
| CN106988935A (en) * | 2016-12-13 | 2017-07-28 | 中国第汽车股份有限公司 | A kind of EGR exhaust purification cooling pressurization integrated apparatus |
| CN105443272B (en) * | 2015-11-27 | 2017-09-19 | 天津大学 | Combustion engine low temp burning Smaller load stable combusting device and method |
| WO2017174254A1 (en) * | 2016-04-06 | 2017-10-12 | Robert Bosch Gmbh | Internal combustion engine having integrated water extraction |
| CN107401462A (en) * | 2016-05-18 | 2017-11-28 | 福特环球技术公司 | For operating the method and system of engine |
| CN108049965A (en) * | 2018-01-09 | 2018-05-18 | 天津大学 | A kind of cleaning engine with air intake duct spraying function |
| CN108087157A (en) * | 2018-01-09 | 2018-05-29 | 天津大学 | A kind of compression-ignition engine low-temperature burning system with air intake duct spraying function |
| CN108533424A (en) * | 2017-12-27 | 2018-09-14 | 沪东重机有限公司 | The changeable gas recirculation system of the pattern of two strokes low-speed diesel engine peculiar to vessel |
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4033160B2 (en) * | 2004-03-30 | 2008-01-16 | トヨタ自動車株式会社 | Control device for internal combustion engine capable of premixed compression self-ignition operation |
| US8352162B2 (en) * | 2010-07-29 | 2013-01-08 | Ford Global Technologies, Llc | Method and system for controlling fuel usage |
| US20130104543A1 (en) * | 2011-10-31 | 2013-05-02 | Transonic Combustion, Llc | Super-critically fueled direct-injection compression ignition system using exhaust gas recirculation |
| MX2015009309A (en) * | 2013-01-17 | 2016-04-13 | Nirmal Mulye | Internally cooled internal combustion engine and method thereof. |
-
2019
- 2019-04-29 CN CN201910353061.9A patent/CN110206641B/en active Active
Patent Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005076456A (en) * | 2003-08-29 | 2005-03-24 | Toyota Motor Corp | Internal combustion engine |
| CN1871412A (en) * | 2003-09-19 | 2006-11-29 | 美国环境保护署 | Low emission diesel combustion system with low charge-air oxygen concentration levels and high fuel injection pressures |
| US6973786B1 (en) * | 2004-10-12 | 2005-12-13 | International Engine Intellectual Property Company, Llc | Emission reduction in a diesel engine by selective use of high-and low-pressure EGR loops |
| CN101592090A (en) * | 2009-07-14 | 2009-12-02 | 天津大学 | A kind of method and device thereof that reduces emission of diesel engine for light vehicle |
| CN103189633A (en) * | 2010-11-04 | 2013-07-03 | 戴姆勒股份公司 | Motor-vehicle internal combustion engine with exhaust-gas recirculation |
| CN102889147A (en) * | 2012-09-26 | 2013-01-23 | 天津大学 | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine |
| CN103061909A (en) * | 2013-01-07 | 2013-04-24 | 天津大学 | Method for improving low-temperature combustion soot emission and fuel economy of diesel engine |
| CN103195595A (en) * | 2013-04-01 | 2013-07-10 | 天津大学 | External inlet air heating and internal exhaust gas recirculation (EGR) strategy cooperative control method |
| CN105339641A (en) * | 2013-06-28 | 2016-02-17 | 丰田自动车株式会社 | Control device for internal combustion engine |
| KR20150111048A (en) * | 2014-03-25 | 2015-10-05 | 두산인프라코어 주식회사 | Engine system for low temperature combustion in diesel engine |
| CN105386858A (en) * | 2014-08-28 | 2016-03-09 | 现代自动车株式会社 | Engine system |
| CN106368857A (en) * | 2015-07-24 | 2017-02-01 | 福特环球技术公司 | A variable exhaust gas recirculation diffuser |
| CN105443272B (en) * | 2015-11-27 | 2017-09-19 | 天津大学 | Combustion engine low temp burning Smaller load stable combusting device and method |
| CN106939839A (en) * | 2015-12-14 | 2017-07-11 | 通用汽车环球科技运作有限责任公司 | The method of explosive motor of the operation with turbocharger |
| CN106958500A (en) * | 2016-01-12 | 2017-07-18 | 福特环球技术公司 | The direct injection boosting explosive motor and its operating method sprayed with water |
| WO2017174254A1 (en) * | 2016-04-06 | 2017-10-12 | Robert Bosch Gmbh | Internal combustion engine having integrated water extraction |
| CN107401462A (en) * | 2016-05-18 | 2017-11-28 | 福特环球技术公司 | For operating the method and system of engine |
| CN106321269A (en) * | 2016-08-22 | 2017-01-11 | 天津大学 | Method for controlling diluent or lean mixed gas burning and ignition through high-flammability fuel micro ignition |
| CN106988935A (en) * | 2016-12-13 | 2017-07-28 | 中国第汽车股份有限公司 | A kind of EGR exhaust purification cooling pressurization integrated apparatus |
| JP2017075608A (en) * | 2016-12-16 | 2017-04-20 | 三菱自動車エンジニアリング株式会社 | Egr gas condensate water treatment device |
| CN108533424A (en) * | 2017-12-27 | 2018-09-14 | 沪东重机有限公司 | The changeable gas recirculation system of the pattern of two strokes low-speed diesel engine peculiar to vessel |
| CN108049965A (en) * | 2018-01-09 | 2018-05-18 | 天津大学 | A kind of cleaning engine with air intake duct spraying function |
| CN108087157A (en) * | 2018-01-09 | 2018-05-29 | 天津大学 | A kind of compression-ignition engine low-temperature burning system with air intake duct spraying function |
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
Non-Patent Citations (2)
| Title |
|---|
| Effect of different technologies on combustion and emissions of the diesel;Jiaqiang E等;《Renewable & Sustainable Energy Reviews》;ELSEVIER;20171215;第620-647页 * |
| State of the art of NOx mitigation technologies and their effect on the;S.M. Palash等;《Energy Conversion and Management》;ELSEVIER;20131215;第400-420页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110206641A (en) | 2019-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109083770B (en) | Method for operating an internal combustion engine | |
| CN102257258A (en) | An exhaust arrangement for an internal combustion engine | |
| WO2015027335A1 (en) | Direct exhaust gas recirculation system | |
| CN107905920A (en) | A kind of apparatus and method that supercharged diesel engine discharge is reduced based on air inlet Composition Control | |
| CN101907025A (en) | Multi-fuel combustion system of internal combustion machine | |
| CN101503983A (en) | Pure oxygen air-intake oxygen-enriched combustion control method and control system for internal combustion engine | |
| CN105673199A (en) | Hydrogen-doped inlet air and oxygen-enriched gasoline engine with EGR and combustion control method | |
| CN109538347A (en) | It is able to achieve the control system and method for full working scope range gasoline high-efficiency cleaning compression ignition | |
| CN109611242A (en) | A kind of high-efficiency cleaning burning diesel | |
| WO2016169428A1 (en) | Method for inhibiting low speed pre-ignition of direct-injection supercharged gasoline engine | |
| CN108087157A (en) | A kind of compression-ignition engine low-temperature burning system with air intake duct spraying function | |
| CN110067637A (en) | The air supply system of gas engine pre-burning component, the cylinder containing the component and cylinder | |
| CN209398491U (en) | A kind of control system that can effectively expand gasoline compression ignition high-efficiency cleaning range of operation | |
| CN114439608A (en) | Water circulation in-cylinder water spray hydrogen internal combustion engine and automobile | |
| CN110206641B (en) | Compression ignition engine and method for realizing low-temperature combustion mode thereof | |
| CN102953869A (en) | Low-emission straight external cooling EGR (exhaust gas recirculation) system | |
| CN101956633A (en) | Exhaust gas recirculation system for internal combustion engine | |
| CN112211759A (en) | Gas engine detonation suppression device and suppression method thereof | |
| CN202937375U (en) | Low-emission cooling exhaust gas recirculation system directly connected with exterior | |
| CN101078384B (en) | Steam ramjet internal and external combustion engine | |
| CN103925072A (en) | EGR (exhaust gas recirculation) and intake humidification based supercharged diesel engine environment protection device | |
| CN109838319A (en) | A kind of control method of combustion system of engine and combustion system of engine | |
| CN207905952U (en) | A kind of compression-ignition engine low-temperature burning system with air intake duct spraying function | |
| CN217582302U (en) | Ammonia engine system | |
| CN102720597A (en) | Homogeneous charge compression ignition (HCCI) and traditional combustion combined operating device and method for engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |