CN114623013B - Stable combustion control method suitable for compression ignition type methanol engine - Google Patents
Stable combustion control method suitable for compression ignition type methanol engine Download PDFInfo
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- CN114623013B CN114623013B CN202210282417.6A CN202210282417A CN114623013B CN 114623013 B CN114623013 B CN 114623013B CN 202210282417 A CN202210282417 A CN 202210282417A CN 114623013 B CN114623013 B CN 114623013B
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
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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
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
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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
- F02D41/30—Controlling fuel injection
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses a stable combustion control method suitable for a compression ignition type methanol engine, which overcomes the defect that the addition content of a cetane number improver cannot change in real time along with the working condition by using a transition fuel, wherein the improver initiates the transition fuel to ignite, the transition fuel burns to release heat so as to improve the temperature in a cylinder, and the combustion stability of methanol is promoted by combining with the recirculation of exhaust gas. The cetane number improver used under different working conditions in the invention accounts for 2% of the total fuel injection volume, and the injection proportion and the exhaust gas recirculation rate of the transition fuel are adjusted according to the air inlet temperature. The hot atmosphere and the active atmosphere created by the cetane number improver, the transition fuel and the exhaust gas simultaneously promote the ignition of the methanol, so that the requirement on the addition content of the cetane number improver is greatly reduced.
Description
Technical Field
The invention relates to the field of engines, in particular to a stable combustion control method of a compression ignition type methanol engine.
Background
The carbon neutral fuel methanol is considered as a potential alternative fuel for the internal combustion engine, the production source of the carbon neutral fuel methanol is very rich, and the carbon neutral fuel methanol can be prepared from coal, coke oven gas, coal bed gas, natural gas, biomass and carbon dioxide and can realize carbon neutral circulation. The compression ignition engine has the characteristics of high thermal efficiency, large torque, less pollution emission, high reliability and the like, and the development of methanol fuel on the compression ignition engine to replace petroleum fuel has important significance for reducing carbon emission and realizing a double-carbon target. In addition, methanol has no C-C bond and contains 50% oxygen, so that the methanol combustion generates substantially no soot.
However, the characteristics of high latent heat of vaporization, high autoignition temperature and low cetane number of methanol make it difficult to ignite methanol in an engine. The conventional method for promoting the stable compression ignition of the methanol mainly comprises the methods of air inlet heating, spark combustion supporting, glow plug combustion supporting, diesel oil ignition and the like. However, the stable ignition of the methanol requires the temperature of the inlet air to reach more than about 100 ℃, the energy consumed by heating the inlet air is too high, the engine needs to be modified for spark combustion supporting and glow plug combustion supporting, and the spark plug and the glow plug have short service life and high price; diesel ignition requires very high diesel proportions.
The cetane number improver can be used for improving methanol ignition, but the addition proportion of the improver in blended fuel is difficult to change in real time along with working conditions. A higher proportion of additive is required for methanol ignition at cold start; under a high-load working condition, the temperature in the cylinder is higher, and the requirement on the additive is less. The use of higher proportions of additives to ensure stable ignition of methanol under all operating conditions would result in a waste of cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a stable combustion control strategy suitable for a compression ignition type methanol engine, makes up the defect that the addition content of a cetane number improver cannot change along with the working condition in real time by using transition fuel, and promotes the stable ignition of methanol by using heat and active free radicals in exhaust gas.
In order to achieve the above object, a stable combustion control method for a compression ignition type methanol engine includes the steps of:
the method comprises the following steps that firstly, an electronic control unit respectively reads a rotating speed signal of a sensor arranged on an engine crankshaft and a position signal of a sensor arranged on an accelerator pedal and judges the operating condition of an engine according to the read signals;
step two, if the operating condition of the engine is a cold start or a small load condition, the electronic control unit controls an intake manifold fuel injector arranged on an intake manifold to be opened, reads a temperature signal output by an intake temperature sensor arranged on an intake pipe, and then executes the following steps:
if the air inlet temperature is less than or equal to 0 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the transition fuel accounts for 10% of the volume fraction of the total fuel injection quantity, and the cetane number of the transition fuel is higher than that of the methanol; controlling an in-cylinder injector to inject blended fuel, and simultaneously controlling the opening and closing time of an exhaust valve to ensure that the exhaust gas recirculation rate is 50 percent, wherein the blended fuel consists of a cetane number improver and 88 percent of methanol which account for 2 percent of the volume ratio of the total fuel injection quantity;
if the air inlet temperature is higher than 0 ℃ and lower than or equal to 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the volume fraction of the transition fuel in the total fuel injection quantity is 8%, the in-cylinder injector is controlled to inject blended fuel, and the opening and closing time of an exhaust valve is controlled at the same time, so that the exhaust gas recirculation rate EGR is 45%, and the blended fuel consists of a cetane number improver and 90% methanol which respectively account for 2% of the total fuel injection quantity in volume ratio;
if the air inlet temperature is higher than 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the transition fuel accounts for 5% of the volume fraction of the total injected fuel quantity, the in-cylinder injector is controlled to inject blended fuel, the opening and closing time of an exhaust valve is controlled at the same time, the exhaust gas recirculation rate EGR is enabled to be 40%, and the blended fuel consists of a cetane number improver and 93% of methanol, wherein the cetane number improver and the 93% of methanol respectively account for 2% of the volume fraction of the total injected fuel quantity;
the total fuel injection quantity is the sum of the fuel injection quantity in the intake manifold and the fuel injection quantity injected by a fuel injector in the cylinder of the engine cylinder;
step three, if the operating condition of the engine is a medium load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98 percent methanol which respectively account for 2 percent of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to ensure that the exhaust gas recirculation rate EGR is 30 percent;
if the inlet air temperature is more than 10 ℃, controlling the opening and closing time of an exhaust valve to enable the exhaust gas recirculation rate EGR to be 20%;
step four, if the operating condition of the engine is a high-load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98% methanol which respectively account for 2% of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to enable the exhaust gas recirculation rate EGR to be 25%;
if the intake air temperature is higher than 10 ℃, the opening and closing time of the exhaust valve is controlled so that the exhaust gas recirculation rate EGR is 10%.
Compared with the prior art, the invention has the following beneficial effects:
1. the defect that the addition content of the cetane number improver cannot change in real time along with the working condition is overcome by using the transition fuel. The methanol can be stably ignited only at a high ambient temperature, and the methanol can be ignited at a lower temperature by using the cetane number improver through the active free radicals generated by the self reaction. However, when the temperature is too low, the free radicals generated by the modifier also hardly react with the methanol molecules. Therefore, in cold start or under a small load condition, the temperature in the cylinder is low, the effect of improving the ignition of the methanol is not good by only using the cetane number improver, and the improver with a high proportion is needed for ensuring the stable ignition of the methanol, so that the cost is greatly increased. The transition fuel is added under the working conditions of cold start and small load, the cetane number of the transition fuel is higher than that of methanol, and the transition fuel is easier to ignite, the improver can initiate the transition fuel to ignite firstly, then the transition fuel is combusted to release heat, and the temperature in the cylinder is improved. Meanwhile, a waste gas recirculation strategy is used, a part of waste gas is left in the cylinder, the temperature in the cylinder can be increased by the burnt waste gas, and the waste gas also contains incompletely burnt formaldehyde, some active free radicals and the like. In conclusion, the hot atmosphere and the active atmosphere created by the cetane number improver, the transition fuel and the exhaust gas simultaneously promote the ignition of the methanol, so that the requirement on the addition content of the cetane number improver is greatly reduced.
2. Methanol is not completely combusted, harmful emission such as formaldehyde, formic acid and the like can be generated, waste gas is recycled, and the waste gas is left in the cylinder for secondary combustion, so that the emission outside the engine can be reduced.
3. The diesel ignition method needs diesel with higher proportion, so that the methanol proportion in the mixed fuel is smaller, and the methanol proportion in the invention is still very high, thus the advantages of methanol carbon neutral fuel can be greatly exerted.
Drawings
FIG. 1 is a control schematic diagram of a compression ignition methanol engine stable combustion control strategy of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
The invention discloses a stable combustion control method suitable for a compression ignition type methanol engine, which comprises the following steps:
the method comprises the following steps that firstly, an electronic control unit respectively reads a rotating speed signal of a sensor arranged on an engine crankshaft and a position signal of a sensor arranged on an accelerator pedal and judges the operating condition of an engine according to the read signals;
step two, if the working condition of the engine operation is a cold start or a small load working condition, the electronic control unit controls an intake manifold injector arranged on an intake manifold to be opened, reads a temperature signal output by an intake temperature sensor arranged on an intake pipe, and then executes the following steps:
if the air inlet temperature is less than or equal to 0 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, wherein the transition fuel accounts for 10 percent of the volume fraction of the total fuel injection quantity, the cetane number of the transition fuel is higher than that of methanol, and the preferred cetane number of the transition fuel is between 35 and 65, such as diesel; the in-cylinder injector is controlled to inject the blended fuel while the opening and closing timing of the exhaust valve is controlled so that the exhaust gas recirculation rate (the mass of exhaust gas staying in the cylinder of the engine accounts for the total mass of gas in the cylinder) becomes 50%. The blended fuel consists of a cetane number improver and 88% methanol which respectively account for 2% of the total fuel injection volume; the total fuel injection amount in the step includes air inlet channel (transition fuel) + cylinder (blended fuel), i.e. 10% + (2% + 88%) =100%, which are volume ratios of the total fuel injection amount.
If the air inlet temperature is higher than 0 ℃ and lower than or equal to 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the volume fraction of the transition fuel in the total oil injection quantity is 8%, the in-cylinder injector is controlled to inject blended fuel, and the opening and closing time of the exhaust valve is controlled at the same time, so that the exhaust gas recirculation rate EGR is 45%. The blended fuel consists of a cetane number improver and 90% methanol which respectively account for 2% and 90% of the total fuel injection volume;
if the air inlet temperature is higher than 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the transition fuel accounts for 5% of the volume fraction of the total injected fuel quantity, the in-cylinder injector is controlled to inject blended fuel, and meanwhile the opening and closing time of the exhaust valve is controlled, so that the exhaust gas recirculation rate EGR is 40%. The blended fuel consists of a cetane number improver and 93 percent methanol which respectively account for 2 percent of the volume ratio of the total fuel injection quantity;
the total fuel injection quantity is the sum of the fuel injection quantity in the intake manifold and the fuel injection quantity injected by the fuel injector in the cylinder of the engine cylinder;
the cetane number improver can be one of isooctyl nitrate, ethylene glycol dinitrate or di-tert-butyl peroxide;
step three, if the operating condition of the engine is a medium load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98 percent methanol which respectively account for 2 percent of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
and if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to enable the exhaust gas recirculation rate EGR to be 30%.
If the intake air temperature is greater than 10 ℃, the opening and closing timings of the exhaust valves are controlled so that the exhaust gas recirculation rate EGR is 20%.
Step four, if the operating condition of the engine is a high-load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98% methanol which respectively account for 2% of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
and if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to enable the exhaust gas recirculation rate EGR to be 25%.
If the intake air temperature is greater than 10 ℃, the opening and closing timings of the exhaust valves are controlled so that the exhaust gas recirculation rate EGR is 10%.
The opening and closing time of the exhaust valve can be controlled by adopting the conventional variable valve timing mechanism, such as: see the Mazxft variable valve timing mechanism (Kang Jianjun, guo Zhaosong, chai Hui, structure and operation principle analysis of Mazxft variable valve timing mechanism [ J ]. Shanxi traffic technology, 2004 (06): 85-86.).
Claims (4)
1. A stable combustion control method suitable for a compression ignition methanol engine is characterized by comprising the following steps:
the method comprises the following steps that firstly, an electronic control unit respectively reads a rotating speed signal of a sensor arranged on an engine crankshaft and a position signal of a sensor arranged on an accelerator pedal and judges the operating condition of an engine according to the read signals;
step two, if the operating condition of the engine is a cold start or a small load condition, the electronic control unit controls an intake manifold fuel injector arranged on an intake manifold to be opened, reads a temperature signal output by an intake temperature sensor arranged on an intake pipe, and then executes the following steps:
if the air inlet temperature is less than or equal to 0 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the transition fuel accounts for 10% of the volume fraction of the total fuel injection quantity, and the cetane number of the transition fuel is higher than that of the methanol; controlling an in-cylinder injector to inject blended fuel, and simultaneously controlling the opening and closing time of an exhaust valve to ensure that the exhaust gas recirculation rate is 50 percent, wherein the blended fuel consists of a cetane number improver accounting for 2 percent of the total fuel injection volume by volume and 88 percent of methanol;
if the air inlet temperature is higher than 0 ℃ and lower than or equal to 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the volume fraction of the transition fuel in the total fuel injection quantity is 8%, the in-cylinder injector is controlled to inject blended fuel, and the opening and closing time of an exhaust valve is controlled at the same time, so that the exhaust gas recirculation rate EGR is 45%, and the blended fuel consists of a cetane number improver and 90% methanol which respectively account for 2% of the total fuel injection quantity in volume ratio;
if the air inlet temperature is higher than 15 ℃, the electronic control unit controls the air inlet manifold injector to inject transition fuel, the transition fuel accounts for 5% of the volume fraction of the total injected fuel quantity, the in-cylinder injector is controlled to inject blended fuel, the opening and closing time of an exhaust valve is controlled at the same time, the exhaust gas recirculation rate EGR is enabled to be 40%, and the blended fuel consists of a cetane number improver and 93% of methanol, wherein the cetane number improver and the 93% of methanol respectively account for 2% of the volume fraction of the total injected fuel quantity;
the total fuel injection quantity is the sum of the fuel injection quantity in the intake manifold and the fuel injection quantity injected by a fuel injector in the cylinder of the engine cylinder;
step three, if the operating condition of the engine is a medium load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98 percent methanol which respectively account for 2 percent of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to ensure that the exhaust gas recirculation rate EGR is 30 percent;
if the inlet air temperature is more than 10 ℃, controlling the opening and closing time of an exhaust valve to enable the exhaust gas recirculation rate EGR to be 20%;
step four, if the operating condition of the engine is a high-load condition, the electronic control unit controls an intake manifold oil injector arranged on an intake manifold to close, controls an in-cylinder oil injector to inject blended fuel, and reads signals of an intake temperature sensor, wherein the blended fuel consists of a cetane number improver and 98% methanol which respectively account for 2% of the volume ratio of the oil injection quantity of the in-cylinder oil injector, and then the following steps are executed:
if the inlet air temperature is less than or equal to 10 ℃, controlling the opening and closing time of the exhaust valve to ensure that the exhaust gas recirculation rate EGR is 25 percent;
if the intake air temperature is higher than 10 ℃, the opening and closing time of the exhaust valve is controlled so that the exhaust gas recirculation rate EGR is 10%.
2. The stable combustion control method suitable for a compression ignition methanol engine according to claim 1, characterized in that: the cetane number improver is one of isooctyl nitrate, ethylene glycol dinitrate or di-tert-butyl peroxide.
3. The stable combustion control method suitable for a compression ignition methanol engine according to claim 1 or 2, characterized in that: the cetane number of the transition fuel is between 35 and 65.
4. The stable combustion control method suitable for a compression ignition methanol engine according to claim 3, characterized in that: the transition fuel is diesel oil.
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| CN202210282417.6A CN114623013B (en) | 2022-03-22 | 2022-03-22 | Stable combustion control method suitable for compression ignition type methanol engine |
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| US7284506B1 (en) * | 2006-05-08 | 2007-10-23 | Ford Global Technologies, Llc | Controlling engine operation with a first and second fuel |
| CN110206642A (en) * | 2019-04-16 | 2019-09-06 | 温州大学瓯江学院 | The heat liberation rate, heat release rate active control system and its control method that internal-combustion piston engine is burnt based on multi-region |
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