CN114483334B - Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method - Google Patents

Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method Download PDF

Info

Publication number
CN114483334B
CN114483334B CN202210090304.6A CN202210090304A CN114483334B CN 114483334 B CN114483334 B CN 114483334B CN 202210090304 A CN202210090304 A CN 202210090304A CN 114483334 B CN114483334 B CN 114483334B
Authority
CN
China
Prior art keywords
water
control unit
signal
electronic control
exhaust gas
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
Application number
CN202210090304.6A
Other languages
Chinese (zh)
Other versions
CN114483334A (en
Inventor
汪硕峰
翟一凡
王喆
纪常伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN202210090304.6A priority Critical patent/CN114483334B/en
Publication of CN114483334A publication Critical patent/CN114483334A/en
Application granted granted Critical
Publication of CN114483334B publication Critical patent/CN114483334B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F02D19/12—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 non-fuel substances or with anti-knock agents, e.g. with anti-knock fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • 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
    • F02D19/02—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 gaseous fuels
    • F02D19/021—Control of components of the fuel supply system
    • 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
    • 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
    • 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
    • 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
    • F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
    • 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]
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1452—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a COx content or concentration
    • F02D41/1453—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a COx content or concentration the characteristics being a CO content or concentration
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • 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
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • 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
    • F02M25/03—Adding water into the cylinder or the pre-combustion chamber
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D2041/147—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrogen content or concentration of the exhaust gases
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention provides a byproduct hydrogen internal combustion engine combining exhaust gas recirculation with direct water injection and a method thereof, and particularly relates to a tail gas internal purification and byproduct hydrogen engine and an air intake and exhaust control technology. The system is additionally provided with a set of tail gas condensation system, a set of combustion control system and a combustion process electric control unit on the basis of keeping all parts of the internal combustion engine body. The tail gas condensation system can condense and collect water in the tail gas, and is matched with the combustion control system to realize low-moisture-content waste gas circulation and in-cylinder water spraying, the electric control unit in the combustion process judges the used waste gas recirculation rate and the in-cylinder water spraying amount according to the working condition characteristics of the engine, the water content of the circulating waste gas under low load is reduced, stable combustion is ensured, the combustion temperature is controlled by combining waste gas recirculation and in-cylinder water spraying under medium and high loads, NOx emission is reduced, water is utilized to promote water gas reaction and secondary work, and therefore the heat efficiency of the secondary hydrogen production internal combustion engine is improved, and the full-working-condition low-NOx emission operation is realized.

Description

Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method
Technical Field
The invention provides a byproduct hydrogen engine combining exhaust gas recirculation with direct water injection and a method thereof, and particularly relates to a tail gas internal purification and byproduct hydrogen engine and an air intake and exhaust control technology.
Background
The development of low-carbon and zero-carbon internal combustion engines is imperative for the demand of carbon neutralization in the field of energy. Hydrogen energy is an ideal alternative fuel for internal combustion engines to meet this demand. However, hydrogen used in actual production and life generally needs to be obtained by electrolyzing water or producing hydrogen from methanol by using renewable energy sources, which increases the loss in the energy conversion process and increases the use cost of hydrogen.
The internal combustion engine has low requirement on the purity of hydrogen, so that industrial by-product hydrogen can be used as fuel for combustion. The byproduct hydrogen is common in the fields of petrochemical industry, chlor-alkali chemical industry, coal chemical industry and the like. The purity of hydrogen in the by-product hydrogen from the fields of petrifaction and the like is generally low, if the by-product hydrogen is purified and used, the problems of energy consumption, cost increase and the like are caused, and the hydrogen can be directly combusted in an internal combustion engine, so that the cost of the hydrogen internal combustion engine can be effectively reduced, and lower harmful emission and higher thermal efficiency than those of the traditional gasoline and diesel engines are obtained.
The in-cylinder mixture of the engine fueled with the by-product hydrogen has a high combustion rate, which causes an increase in combustion temperature, resulting in increased NOx emissions produced during combustion of the mixture. Exhaust gas recirculation is one of effective methods for controlling nitrogen oxides of an engine, and mainly utilizes carbon dioxide, water and the like in exhaust gas to change the thermodynamic characteristics of an intake working medium, so that combustion is inhibited, the temperature is reduced, and the generation of thermal NOx is controlled.
Besides inert gases such as nitrogen, the exhaust gas recirculation also comprises water for controlling the combustion temperature, and under the condition of an internal combustion engine, the water in the exhaust gas enters a combustion chamber at the saturation humidity of the intake air temperature, so that the proportion of the water is difficult to adjust according to the requirement of the engine. For the byproduct hydrogen internal combustion engine, the existence of a large amount of water vapor in the exhaust gas can reduce the charging efficiency; excessive water in exhaust gas recirculation at low load reduces the combustion rate, affecting combustion efficiency and thermal efficiency; the water content cannot be increased under high load conditions, so that the combustion temperature cannot be effectively controlled; meanwhile, for byproduct hydrogen production, due to the existence of carbon-containing molecules, proper water spraying can promote the water gas reaction to improve the hydrogen content and the engine efficiency. In addition, the existing research shows that the water spraying into the cylinder can also utilize the gasification process of water under the high-temperature condition to do work for the second time and release heat, thereby improving the efficiency and the power of the engine. Therefore, the reasonable utilization of the water in the waste gas has important significance for improving the performance of the byproduct hydrogen internal combustion engine.
Disclosure of Invention
The invention provides a byproduct hydrogen internal combustion engine combining exhaust gas recirculation with direct water injection and a method thereof, aiming at the problem that the water content in the inlet air can not be adjusted in real time according to the combustion requirement of the internal combustion engine when the combustion and emission characteristics of the byproduct hydrogen internal combustion engine are controlled by exhaust gas recirculation. The invention can firstly reduce the water content in the waste gas through the condenser, and recover the condensed water, so that the condensed water can be directly injected into the internal combustion engine through the high-pressure pump and the nozzle, thereby reducing the influence of a large amount of water vapor on the charging efficiency of the internal combustion engine, and simultaneously adopting the low-temperature waste gas with lower water content to dilute the intake air under the condition of low load, thereby achieving the purpose of reducing the influence on the combustion rate and the efficiency while reducing the NOx emission; under the condition of medium load, a small amount of water is sprayed in the cylinder to promote the carbon-containing hydrocarbon in the byproduct hydrogen to react with water and gas so as to improve the hydrogen concentration in the combustion chamber, accelerate the combustion rate and promote the efficiency of the internal combustion engine to be improved; under the condition of large load, the temperature in the cylinder is controlled by combining early spraying in the cylinder with the increase of water spraying amount, the NOx emission is reduced, and the working capacity and efficiency of the engine are improved by utilizing the principle of large amount of water gasification working under the high-temperature condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of exhaust gas recirculation combines the by-product hydrogen internal-combustion engine of the direct injection of water, on the basis of keeping 1 internal-combustion engine, 2 hydrogen gas spray nozzle, air control valve 3 and original machine electric control unit 4 and increased a set of tail gas condensing system, a set of combustion control system and a combustion process electric control unit 5;
the tail gas condensation system comprises a tail gas condenser 12 connected to an exhaust pipe of the internal combustion engine and a water collecting tank 10 connected with the lower part of the tail gas condenser 12 through a pipeline, the temperature of high-temperature tail gas is reduced after the high-temperature tail gas passes through the tail gas condenser 12, redundant gaseous water exceeding the condensation temperature of the condenser naturally falls and is collected in the water collecting tank 10, an outlet at the upper part of the tail gas condenser 12 is connected with an exhaust gas circulating valve 11 through a pipeline, and the dried waste gas flowing through the tail gas condenser 12 is conveyed to a waste gas inlet one-way valve 6 through the exhaust gas circulating valve 11 and a connecting pipeline;
the combustion control system comprises a water nozzle 8 connected to a cylinder cover of the internal combustion engine 1, a high-pressure water pump 13 is installed in a pipeline connected between the water nozzle 8 and a water collecting tank 10, and water in the water collecting tank 10 is pressurized by the high-pressure water pump 13 and then forms direct jet flow in a combustion chamber through the water nozzle 8;
the combustion control system also comprises a spark plug type cylinder pressure sensor 7 for collecting combustion pressure signals and controlling spark-over, and an exhaust concentration sensor 9 for monitoring the concentrations of different substances in exhaust in real time;
the combustion process electronic control unit 5 adjusts the opening degree of the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a;
the combustion process electronic control unit 5 analyzes CO and O in the tail gas according to the concentration signal b of the emission component received from the emission concentration sensor 9 2 、H 2 NOx concentration;
the combustion process electronic control unit 5 controls the running state of the high-pressure water pump 13 by sending a water pump start-stop signal p;
the combustion process electronic control unit 5 adjusts the injection phase and the pulse width of the water nozzle 8 by sending a water nozzle control signal c;
the combustion process electronic control unit 5 analyzes the combustion heat release process of the byproduct hydrogen internal combustion engine according to the received cylinder pressure signal d from the spark plug type cylinder pressure sensor 7;
the combustion process electronic control unit 5 controls the injection phase and pulse width of the hydrogen nozzle 2 by sending a byproduct hydrogen injection signal f;
the combustion process electronic control unit 5 is connected with the original engine electronic control unit 4 and obtains a coolant temperature signal t, a target torque signal m, an actual torque signal n and an original engine hydrogen injection signal g;
the hydrogen nozzle 2 arranged on the internal combustion engine 1 is used for secondary hydrogen injection;
the maximum exhaust gas recirculation coefficient which can be provided by the exhaust gas recirculation valve 11 under the full-open condition is not more than 30%;
the opening and closing of the throttle valve 3 are controlled by an original machine electronic control unit 4.
The invention discloses a control method of a byproduct hydrogen internal combustion engine combining exhaust gas recirculation with direct water injection, which comprises the following steps:
the combustion process electronic control unit 5 firstly determines the control mode of the waste gas system according to the coolant temperature signal t;
(1) When the temperature of the cooling liquid is lower than 40 ℃, the combustion process electronic control unit 5 judges that the internal combustion engine 1 is in a cold stage, stops the operation of the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to stop the injection of the water nozzle 8, sends an exhaust gas circulating valve control signal a to set the opening of the exhaust gas circulating valve 11 to be 0, and thus stops the exhaust gas from entering an air inlet channel and stops water from being directly injected into a combustion chamber so as to eliminate the influence of the dilution of the exhaust gas and the water on the combustion stability of the byproduct hydrogen internal combustion engine under the low-temperature condition;
(2) When the temperature of the cooling liquid is greater than or equal to 40 ℃, the combustion process electronic control unit 5 judges that the internal combustion engine 1 is in a normal working temperature state, and at the moment, the combustion process electronic control unit 5 further calculates the load rate of the engine according to the target torque signal m and determines the control mode of the exhaust system according to the load rate (R);
R＝M r /M f equation 1
In formula 1, M r The actual demand torque of the byproduct hydrogen internal combustion engine is obtained through a target torque signal M f For the full load torque of the engine at a certain speed, M f The engine is obtained by the universal characteristics of the engine provided by manufacturers;
when R is more than or equal to 0 and less than or equal to 0.35, the combustion process electronic control unit 5 judges that the byproduct hydrogen internal combustion engine is in a low-load operation stage, and in order to avoid the problem of combustion stability reduction caused by water spraying in a cylinder, at the moment, the combustion process electronic control unit 5 stops the operation of the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to stop the spraying of the water nozzle 8, opens the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a, controls the opening degree (E) of the exhaust gas circulating valve 11 to change within the range of 0 and less than or equal to 50%, and the E is linearly increased along with the increase of R, at the moment, only the low-water-content exhaust gas from the exhaust gas circulating valve dilutes mixed gas in the combustion chamber, so that the temperature in the cylinder is reduced, the generation of NOx can be inhibited, and the combustion stability reduction caused by the fact that a large amount of water vapor enters the combustion chamber can not be caused;
when R is more than 0.35 and less than or equal to 0.75, the combustion process electronic control unit 5 judges that the hydrogen production byproduct internal combustion engine is in a medium-load operation stage, the fuel consumption in a cylinder is increased, the combustion stability is good, the water content in a combustion chamber can be improved to promote the water gas reaction, and NOx is controlled by combining water direct injection and exhaust gas recirculation, under the condition, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle 8, so that the opening phase of the water nozzle 8 is positioned at a crank angle of 10 degrees before ignition, the effective opening pulse width (H) of the water nozzle 8 is changed within 0 and less than or equal to 4ms, H is linearly increased along with the increase of R, meanwhile, the combustion process electronic control unit 5 opens the exhaust gas circulation valve 11 by sending an exhaust gas circulation valve control signal a, controls the opening degree (E) of the exhaust gas circulation valve 11 to be changed within 50 percent and less than or equal to 100 percent, and E is linearly increased along with the increase of R;
when R is more than 0.75 and less than or equal to 1.00, the combustion process electronic control unit 5 judges that the byproduct hydrogen internal combustion engine is in a high-load operation stage, and the combustion chamber is in a high-temperature state at the moment, the combustion stability is good, the combustion temperature can be controlled by increasing the water injection proportion and combining the sectional water injection and the secondary work-doing characteristic of water is utilized to further improve the work-doing capability and the heat efficiency of the byproduct hydrogen internal combustion engine, in which the combustion process ecu 5 opens the egr valve 11 by issuing the egr valve control signal a, and controls the opening degree of the exhaust gas circulating valve 11 to be kept at 80%, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle 8, enables the first opening phase of the water nozzle 8 to be located at a crank angle of 20 degrees before ignition, sets the first opening effective pulse width H of the water nozzle 8 according to the NO concentration and CO obtained by the combustion process electronic control unit 5 according to the emission component concentration signal b, the effective pulse width H is adjusted to open the water nozzle 8 for the first time to ensure that the concentration of NO and the concentration of CO are not higher than 50ppm and 90ppm respectively, the combustion process electric control unit 5 further sends a water nozzle control signal c according to the load rate R to control the second effective injection of the water nozzle 8 to promote the improvement of the dynamic property and the efficiency of the byproduct hydrogen internal combustion engine by utilizing the secondary heat release of water, the opening moment of the second water nozzle 8 is a crank angle of 10 degrees after ignition, at the moment, the mixed gas is combusted and enters a flame propagation period, and the gasification work of the secondary water injection is promoted by utilizing the high temperature in the flame propagation period, and the temperature in the combustion chamber is further reduced by secondary water spraying, and the secondary effective spraying pulse width (G) of the water nozzle 8 is set to be more than or equal to 1ms and less than or equal to 4ms and linearly increases along with the increase of R.
Under the condition that R is more than 0.35 and less than or equal to 1.00, the combustion process electronic control unit 5 starts the high-pressure water pump 13 and the water nozzle 8 to enable water to be directly injected into the combustion chamber, and under the condition that the water is directly injected and opened, in order to ensure the combustion stability, the combustion process electronic control unit 5 calculates the cyclic variation coefficient (CoVimep) of the average indicated pressure according to a cylinder pressure signal d sent by a spark plug type cylinder pressure sensor 7
Figure BDA0003488893920000051
P i,N = PdV formula 3
In equations 2 and 3, P is the cylinder pressure obtained from the cylinder pressure sensor 7, P i,N The effective pressure is indicated for the average of the nth cycle,
Figure BDA0003488893920000052
for adjusting the water nozzles 8 from the first cycle (i.e. the combustion process electronic control unit 5 by issuing a water nozzle control signal c)The first cycle of the injection pulse width) indicates the mean value of the effective pressures in the average over M cycles (M is set to be not less than 50 in the combustion process electronic control unit 5), and the relationship between the in-cylinder volume V of the internal combustion engine and the crank angle is preset in the combustion process electronic control unit 5 according to the structure of the engine body.
When the CoVimep is more than 10%, the combustion process electronic control unit 5 sends out a water nozzle control signal c to reduce the first injection pulse width of the water nozzle 8 by 0.3ms compared with the last cycle in each subsequent M cycles until the CoVimep is less than or equal to 8%;
when a pure hydrogen engine is reformed into a hydrogen production by-product internal combustion engine, a combustion process electronic control unit 5 controls the injection phase and the pulse width of a hydrogen nozzle 2 according to a received original engine hydrogen injection signal g, when a target torque signal m fed back by the original engine electronic control unit 4 is equal to an actual torque signal n, the combustion process electronic control unit 5 enables the rule of a hydrogen production by-product injection signal f to be consistent with that of the original engine hydrogen injection signal g, when the target torque signal m is larger than the actual torque signal n, the combustion process electronic control unit 5 increases the hydrogen production by 0.5ms per cycle on the basis of the original engine hydrogen injection signal g until the target torque signal m is equal to the actual torque signal n on the premise that the initial injection phase of the hydrogen production by-product injection signal f is consistent with that of the original engine hydrogen injection signal g, and when the target torque signal m is smaller than the actual torque signal n, the combustion process electronic control unit 5 reduces the hydrogen production by 0.5ms per cycle on the basis of the original engine hydrogen injection signal g until the target torque signal m is equal to the actual torque signal n.
The invention has the beneficial effects that: the invention provides a byproduct hydrogen internal combustion engine combining exhaust gas recirculation and direct water injection and a method thereof, aiming at the problem that the exhaust gas recirculation is difficult to control the water content according to the working condition requirement, wherein a condenser and a water collector are arranged in an exhaust passage to condense and collect water in tail gas, and the exhaust gas recirculation proportion and the water injection quantity are adjusted according to the working condition requirement, so that the engine adopts the exhaust gas with lower humidity to dilute mixed gas to control NOx emission under the condition of small load, and the content of mixed gas water under the working condition is reduced to achieve the purposes of ensuring the combustion stability and reducing the engine oil dilution; in thatUnder the working condition of medium load, the method of combining primary water spraying in the cylinder with exhaust gas recirculation is adopted to improve the water content in the cylinder and promote the water gas reaction to ensure that water reacts with CO and flows to H 2 The components of the mixed gas are converted, the NOx emission is controlled, and meanwhile, the combustion efficiency is improved; under the condition of large load, NOx emission is controlled in a mode of twice water direct injection and exhaust gas recirculation, water gas reaction is promoted by combining primary water injection and secondary water injection, and the purpose of improving the work capacity and efficiency of the byproduct hydrogen internal combustion engine is achieved by utilizing the secondary work of the gasification process of liquid water in a cylinder.
Drawings
FIG. 1 is a schematic diagram of the structure and operation of the present invention
In the figure: 1 an internal combustion engine; 2 a hydrogen gas nozzle; 3, a throttle valve; 4, an original machine electric control unit; 5 a combustion process electronic control unit; 6, a one-way valve of a tail gas inlet; 7 spark plug type cylinder pressure sensor; 8, water nozzles; 9 an emission concentration sensor; 10 water collecting tank; 11 an exhaust gas circulation valve; 12 tail gas condenser; 13 high-pressure water pump
a. An exhaust gas recirculation valve control signal; b. an emission component concentration signal; c. a water nozzle control signal; d. a cylinder pressure signal; f. a byproduct hydrogen injection signal; t. coolant temperature signal; m. a target torque signal; n. a load signal; p, starting and stopping a water pump; g. original machine hydrogen injection signal
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, in the byproduct hydrogen internal combustion engine combining exhaust gas recirculation and direct injection of water in the present embodiment, a set of tail gas condensation system, a set of combustion control system and a combustion process electronic control unit 5 are added on the basis of keeping an internal combustion engine 1, a hydrogen nozzle 2, a throttle 3 and an original engine electronic control unit 4;
the tail gas condensation system comprises a tail gas condenser 12 connected to an exhaust pipe of the internal combustion engine and a water collecting tank 10 connected with the lower part of the tail gas condenser 12 through a pipeline, the temperature of high-temperature tail gas is reduced after the high-temperature tail gas passes through the tail gas condenser 12, redundant gaseous water exceeding the condensation temperature of the condenser naturally falls and is collected in the water collecting tank 10, an outlet at the upper part of the tail gas condenser 12 is connected with an exhaust gas circulating valve 11 through a pipeline, and the dried waste gas flowing through the tail gas condenser 12 is conveyed to a waste gas inlet one-way valve 6 through the exhaust gas circulating valve 11 and a connecting pipeline;
the combustion control system comprises a water nozzle 8 connected to a cylinder cover of the internal combustion engine 1, a high-pressure water pump 13 is installed in a pipeline connected between the water nozzle 8 and a water collecting tank 10, and water in the water collecting tank 10 is pressurized by the high-pressure water pump 13 and then forms direct jet flow in a combustion chamber through the water nozzle 8;
the combustion control system also comprises a spark plug type cylinder pressure sensor 7 for collecting combustion pressure signals and controlling spark-over, and an exhaust concentration sensor 9 for monitoring the concentrations of different substances in exhaust in real time;
the combustion process electronic control unit 5 adjusts the opening degree of the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a;
the combustion process electronic control unit 5 analyzes CO and O in the exhaust gas according to the emission component concentration signal b received from the emission concentration sensor 9 2 、H 2 NOx concentration;
the combustion process electronic control unit 5 controls the running state of the high-pressure water pump 13 by sending a water pump start-stop signal p;
the combustion process electronic control unit 5 adjusts the injection phase and the pulse width of the water nozzle 8 by sending a water nozzle control signal c;
the combustion process electronic control unit 5 analyzes the combustion heat release process of the byproduct hydrogen internal combustion engine according to the received cylinder pressure signal d from the spark plug type cylinder pressure sensor 7;
the combustion process electronic control unit 5 controls the injection phase and pulse width of the hydrogen nozzle 2 by sending a byproduct hydrogen injection signal f;
the combustion process electronic control unit 5 is connected with the original engine electronic control unit 4 and obtains a coolant temperature signal t, a target torque signal m, an actual torque signal n and an original engine hydrogen injection signal g;
the hydrogen nozzle 2 arranged on the internal combustion engine 1 is used for secondary hydrogen injection;
the maximum exhaust gas recirculation coefficient that the exhaust gas recirculation valve 11 can provide under the full-open condition is not more than 30%;
the opening and closing of the throttle valve 3 is controlled by an original engine electronic control unit 4.
The invention discloses a control method of a byproduct hydrogen internal combustion engine combining exhaust gas recirculation with direct water injection, which comprises the following steps:
the combustion process electronic control unit 5 firstly determines the control mode of the waste gas system according to the coolant temperature signal t;
(1) When the temperature of the cooling liquid is lower than 40 ℃, the combustion process electronic control unit 5 judges that the internal combustion engine 1 is in a cold stage, stops the operation of the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to stop the injection of the water nozzle 8, sends an exhaust gas circulating valve control signal a to set the opening of the exhaust gas circulating valve 11 to be 0, and thus stops the exhaust gas from entering the air inlet channel and stops the water from being directly injected into the combustion chamber so as to eliminate the influence of the dilution of the exhaust gas and the water on the combustion stability of the byproduct hydrogen internal combustion engine under the low-temperature condition;
(2) When the temperature of the cooling liquid is greater than or equal to 40 ℃, the combustion process electronic control unit 5 judges that the internal combustion engine 1 is in a normal working temperature state, and at the moment, the combustion process electronic control unit 5 further calculates the load rate of the engine according to the target torque signal m and determines the control mode of the exhaust system according to the load rate (R);
R＝M r /M f equation 1
In formula 1, M r The actual required torque of the byproduct hydrogen internal combustion engine is obtained through a target torque signal M f For the full load torque of the engine at a certain speed, M f The engine is obtained by the universal characteristics of the engine provided by manufacturers;
when R is more than or equal to 0 and less than or equal to 0.35, the combustion process electronic control unit 5 judges that the byproduct hydrogen internal combustion engine is in a low-load operation stage, and in order to avoid the problem of combustion stability reduction caused by water spraying in a cylinder, at the moment, the combustion process electronic control unit 5 stops the operation of the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to stop the spraying of the water nozzle 8, opens the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a, controls the opening degree (E) of the exhaust gas circulating valve 11 to change within the range of 0 and less than or equal to 50%, and the E is linearly increased along with the increase of R, at the moment, only the low-water-content exhaust gas from the exhaust gas circulating valve dilutes mixed gas in the combustion chamber, so that the temperature in the cylinder is reduced, the generation of NOx can be inhibited, and the combustion stability reduction caused by the fact that a large amount of water vapor enters the combustion chamber can not be caused;
when R is more than 0.35 and less than or equal to 0.75, the combustion process electronic control unit 5 judges that the byproduct hydrogen internal combustion engine is in a medium-load operation stage, the fuel consumption in a cylinder is increased, the combustion stability is good, the water content in a combustion chamber can be improved to promote the water gas reaction, and the NOx is controlled by the combination of direct water injection and exhaust gas recirculation, under the condition, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle 8, so that the opening phase of the water nozzle 8 is positioned at a crank rotation angle of 10 degrees before ignition, the effective opening pulse width (H) of the water nozzle 8 is changed within the range of 0 and less than or equal to H and less than or equal to 4ms, and H is linearly increased along with the increase of R, and simultaneously, the combustion process electronic control unit 5 opens the exhaust gas circulation valve 11 by sending an exhaust gas circulation valve control signal a, controls the opening degree (E) of the exhaust gas circulation valve 11 to be changed within the range of 50 percent and less than or equal to 100 percent, and E is linearly increased along with the increase of R;
when R is more than 0.75 and less than or equal to 1.00, the combustion process electronic control unit 5 judges that the byproduct hydrogen internal combustion engine is in a high-load operation stage, and the combustion chamber is in a high-temperature state at the moment, the combustion stability is good, the combustion temperature can be controlled by increasing the water injection proportion and combining the sectional water injection, the working capacity and the heat efficiency of the byproduct hydrogen internal combustion engine can be further improved by utilizing the secondary working characteristic of water, in which the combustion process ecu 5 opens the exhaust gas recirculation valve 11 by issuing an exhaust gas recirculation valve control signal a, and controls the opening degree of the exhaust gas circulating valve 11 to be kept at 80%, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle 8, enables the first opening phase of the water nozzle 8 to be located at a crank angle of 20 degrees before ignition, sets the first opening effective pulse width H of the water nozzle 8 according to the NO concentration and CO obtained by the combustion process electronic control unit 5 according to the emission component concentration signal b, the effective pulse width H is adjusted to open the water nozzle 8 for the first time to ensure that the concentration of NO and the concentration of CO are not higher than 50ppm and 90ppm respectively, the combustion process electric control unit 5 further sends a water nozzle control signal c according to the load rate R to control the second effective injection of the water nozzle 8 to promote the improvement of the dynamic property and the efficiency of the byproduct hydrogen internal combustion engine by utilizing the secondary heat release of water, the opening moment of the second water nozzle 8 is a crank angle of 10 degrees after ignition, at the moment, the mixed gas is combusted and enters a flame propagation period, and the gasification work of the secondary water injection is promoted by utilizing the high temperature in the flame propagation period, and the temperature in the combustion chamber is further reduced by secondary water spraying, and the secondary effective spraying pulse width (G) of the water nozzle 8 is set to be more than or equal to 1ms and less than or equal to 4ms and linearly increases along with the increase of R.
Under the condition that R is more than 0.35 and less than or equal to 1.00, the combustion process electronic control unit 5 starts the high-pressure water pump 13 and the water nozzle 8 to enable water to be directly injected into the combustion chamber, and under the condition that the water is directly injected and opened, in order to ensure the combustion stability, the combustion process electronic control unit 5 calculates the cyclic variation coefficient (CoVimep) of the average indicated pressure according to a cylinder pressure signal d sent by a spark plug type cylinder pressure sensor 7
Figure BDA0003488893920000091
P i,N = PdV formula 3
In equations 2 and 3, P is the cylinder pressure obtained from the cylinder pressure sensor 7, P i,N The effective pressure is indicated for the average of the nth cycle,
Figure BDA0003488893920000092
in order to indicate the mean value of the mean effective pressures (setting M in the combustion process electronic control unit 5 is not less than 50) in M cycles from the first cycle (i.e., the first cycle in which the combustion process electronic control unit 5 adjusts the injection pulse width of the water nozzle 8 by issuing the water nozzle control signal c), the relation of the internal cylinder volume V of the internal combustion engine to the crank angle is preset in the combustion process electronic control unit 5 in accordance with the internal combustion engine body structure.
When the CoVimep is more than 10%, the combustion process electronic control unit 5 sends out a water nozzle control signal c to reduce the first injection pulse width of the water nozzle 8 by 0.3ms compared with the last cycle in each subsequent M cycles until the CoVimep is less than or equal to 8%;
when a pure hydrogen engine is reformed into a hydrogen production by-product internal combustion engine, a combustion process electronic control unit 5 controls the injection phase and the pulse width of a hydrogen nozzle 2 according to a received original engine hydrogen injection signal g, when a target torque signal m fed back by the original engine electronic control unit 4 is equal to an actual torque signal n, the combustion process electronic control unit 5 enables the rule of a hydrogen production by-product injection signal f to be consistent with that of the original engine hydrogen injection signal g, when the target torque signal m is larger than the actual torque signal n, the combustion process electronic control unit 5 increases the hydrogen production by 0.5ms per cycle on the basis of the original engine hydrogen injection signal g until the target torque signal m is equal to the actual torque signal n on the premise that the initial injection phase of the hydrogen production by-product injection signal f is consistent with that of the original engine hydrogen injection signal g, and when the target torque signal m is smaller than the actual torque signal n, the combustion process electronic control unit 5 reduces the hydrogen production by 0.5ms per cycle on the basis of the original engine hydrogen injection signal g until the target torque signal m is equal to the actual torque signal n.
The following experiment was carried out in this example with the coolant temperature ranging from 90 ℃ to 95 ℃ under three selected conditions:
(1) And in a small load experiment, the rotating speed of the byproduct hydrogen internal combustion engine is stabilized at 2000R/min, and the load rate R is set to be 30%.
Under the working condition, the combustion process electronic control unit 5 calculates the load factor to be 0.30 according to the target torque signal m and judges that the byproduct hydrogen internal combustion engine is in a low-load operation stage. At the moment, the combustion process electronic control unit 5 opens the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a and controls the opening degree of the exhaust gas circulating valve to be 42.3%, and meanwhile, the combustion process electronic control unit 5 stops the operation of the water nozzle 8 and the high-pressure water pump 13, and experimental results show that after the exhaust gas circulating valve is opened, the NOx emission of the byproduct hydrogen internal combustion engine under the same working condition is reduced to 27ppm from 308ppm of the original engine, and the heat efficiency is basically equivalent to that of the original engine;
(2) And in the medium load experiment, the rotating speed of the byproduct hydrogen internal combustion engine is stabilized at 2000R/min, and the load rate R is set to be 50%.
Under the working condition, the combustion process electronic control unit 5 calculates the load factor to be 0.50 according to the target torque signal m and judges that the byproduct hydrogen internal combustion engine is in the middle-load operation stage. Under the condition, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle 8, so that the opening phase of the water nozzle 8 is positioned at a crank angle of 10 degrees before ignition, the effective opening pulse width (H) of the water nozzle 8 is controlled to be 2.1ms, and simultaneously the combustion process electronic control unit 5 opens the exhaust gas circulating valve 11 by sending an exhaust gas circulating valve control signal a and controls the opening of the exhaust gas circulating valve 11 to be 83.5 percent. Experimental results show that the NOx emission of the byproduct hydrogen internal combustion engine under the same working condition is reduced to 37ppm from 467ppm of the original engine, and meanwhile, the thermal efficiency is improved to 35.2% of that after the system is started from 33.6% of the original engine due to the fact that the water gas reaction improves the mixed gas characteristic and the secondary work of direct injection water in the cylinder.
(3) And in a large-load experiment, the rotating speed of the byproduct hydrogen internal combustion engine is stabilized at 2000R/min, and the load rate R is set to be 100%.
Under the working condition, the combustion process electronic control unit 5 calculates the load factor to be 1.00 according to the target torque signal m and judges that the byproduct hydrogen internal combustion engine is in a large-load operation stage. The combustion process electronic control unit 5 opens the exhaust gas circulation valve 11 by sending an exhaust gas circulation valve control signal a, controls the opening degree of the exhaust gas circulation valve 11 to be kept at 80%, the combustion process electronic control unit 5 starts the high-pressure water pump 13 by sending a water pump start-stop signal p, sends a water nozzle control signal c to start the water nozzle 8, enables the first start phase of the water nozzle 8 to be located at a crank angle of 20 degrees before ignition, the first start effective pulse width of the water nozzle 8 is stabilized at 3.1ms after primary adjustment, the combustion process electronic control unit 5 further sends a water nozzle control signal c to control the second effective injection pulse width of the water nozzle 8 to be 4ms, the start time of the second water nozzle 8 is 10 degrees after ignition, under the condition, the combustion process electronic control unit 5 calculates the cycle variation coefficient (CoVimep) of the average indication pressure of 50 cycles according to a cylinder pressure signal d sent by the spark plug type cylinder pressure sensor 7 to be 10.5%, the combustion process electronic control unit 5 judges that the secondary injection pulse width is reduced, adjusts the secondary injection pulse width to be 3.7ms, the combustion process electronic control unit further calculates the secondary injection pulse width of the combustion process to be reduced to be 3.5, and further checks that the secondary injection pulse width of the combustion process is stabilized, and the combustion process is 3.5. The experimental result shows that the NOx emission of the byproduct hydrogen internal combustion engine under the same working condition is reduced to 33ppm from 702ppm of the original engine, the water spraying proportion in the cylinder is increased, the water gas reaction and the gasification work of water are promoted, and the heat efficiency of the byproduct hydrogen internal combustion engine is improved to 37.2% from 35.5% before the intervention of the system.
In the experimental process, the byproduct hydrogen internal combustion engine runs stably, and the invention shows that the byproduct hydrogen internal combustion engine combining exhaust gas recirculation and direct injection and the method thereof can effectively reduce NOx and improve the heat efficiency of part of engines under the working condition.

Claims (2)

1. The utility model provides a by-product hydrogen internal-combustion engine that exhaust gas recirculation combines direct injection of water which characterized in that: on the basis of reserving the internal combustion engine (1), the hydrogen nozzle (2), the throttle valve (3) and the original engine electric control unit (4), a set of tail gas condensation system, a set of combustion control system and a combustion process electric control unit (5) are added;
the tail gas condensation system comprises a tail gas condenser (12) connected to an exhaust pipe of the internal combustion engine and a water collecting tank (10) connected with the lower part of the tail gas condenser (12) through a pipeline, the temperature of high-temperature tail gas is reduced after the high-temperature tail gas passes through the tail gas condenser (12), redundant gaseous water exceeding the condensation temperature of the condenser naturally falls down and is collected in the water collecting tank (10), an outlet at the upper part of the tail gas condenser (12) is connected with an exhaust gas circulating valve (11) through a pipeline, and the dried waste gas flowing through the tail gas condenser (12) is conveyed to a waste gas inlet one-way valve (6) through the exhaust gas circulating valve (11) and a connecting pipeline;
the combustion control system comprises a water nozzle (8) connected to a cylinder cover of the internal combustion engine (1), a high-pressure water pump (13) is installed in a pipeline connected between the water nozzle (8) and a water collecting tank (10), and water in the water collecting tank (10) is pressurized by the high-pressure water pump (13) and then forms direct injection jet in a combustion chamber through the water nozzle (8);
the combustion control system also comprises a spark plug type cylinder pressure sensor (7) for collecting combustion pressure signals and controlling spark-over, and an exhaust concentration sensor (9) for monitoring the concentrations of different substances in exhaust in real time;
the combustion process electronic control unit (5) adjusts the opening degree of an exhaust gas circulating valve (11) by sending an exhaust gas circulating valve control signal a;
the combustion process electronic control unit (5) analyzes CO and O in the tail gas according to the emission component concentration signal b received from the emission concentration sensor (9) 2 、H 2 、NO x Concentration;
the combustion process electronic control unit (5) controls the running state of the high-pressure water pump (13) by sending a water pump start-stop signal p;
the combustion process electronic control unit (5) adjusts the injection phase and the pulse width of the water nozzle (8) by sending a water nozzle control signal c;
the combustion process electronic control unit (5) analyzes the combustion heat release process of the byproduct hydrogen internal combustion engine according to a received cylinder pressure signal d from the spark plug type cylinder pressure sensor (7);
the combustion process electronic control unit (5) controls the injection phase and pulse width of the hydrogen nozzle (2) by sending a byproduct hydrogen injection signal f;
the combustion process electronic control unit (5) is connected with the original engine electronic control unit (4) and obtains a cooling liquid temperature signal t, a target torque signal m, an actual torque signal n and an original engine hydrogen injection signal g;
the hydrogen nozzle (2) arranged on the internal combustion engine (1) is used for secondary hydrogen injection;
the maximum exhaust gas recirculation coefficient which can be provided by the exhaust gas recirculation valve (11) under the full-opening condition is not more than 30 percent;
the opening and closing of the throttle valve (3) is controlled by an original machine electric control unit (4).
2. Method for controlling an internal combustion engine with hydrogen production by-product with exhaust gas recirculation combined with direct injection of water according to claim 1, characterized in that:
the combustion process electronic control unit (5) firstly determines a control mode of a waste gas system according to the temperature signal t of the cooling liquid;
(1) When the temperature of the cooling liquid is lower than 40 ℃, the combustion process electronic control unit (5) judges that the internal combustion engine (1) is in a cold machine stage, stops the operation of the high-pressure water pump (13) by sending a water pump start-stop signal p, stops the injection of the water nozzle (8) by sending a water nozzle control signal c, and sends an exhaust gas circulating valve control signal a to set the opening of the exhaust gas circulating valve (11) to be 0, so that the exhaust gas is stopped from entering the air inlet channel, and the water is stopped from being directly injected into the combustion chamber to eliminate the influence of the dilution of the exhaust gas and the water on the combustion stability of the byproduct hydrogen internal combustion engine under the low-temperature condition;
(2) When the temperature of the cooling liquid is higher than or equal to 40 ℃, the combustion process electronic control unit (5) judges that the internal combustion engine (1) is in a normal working temperature state, and at the moment, the combustion process electronic control unit (5) further calculates the load rate of the engine according to the target torque signal m and determines the control mode of the exhaust system according to the load rate R;
R＝M r /M f equation 1
In formula 1, M r The actual required torque of the byproduct hydrogen internal combustion engine is obtained through a target torque signal M f For the full load torque of the engine at a certain speed, M f The engine is obtained by the universal characteristics of the engine provided by manufacturers;
when R is more than or equal to 0 and less than or equal to 0.35, the combustion process electronic control unit (5) judges that the hydrogen production by-product internal combustion engine is in a low-load operation stage, and in order to avoid the problem of reduction of combustion stability caused by water spraying in a cylinder, at the moment, the combustion process electronic control unit (5) stops the operation of the high-pressure water pump (13) by sending a water pump start-stop signal p, sends a water nozzle control signal c to stop the spraying of the water nozzle (8), the combustion process electronic control unit (5) opens the exhaust gas circulating valve (11) by sending an exhaust gas circulating valve control signal a, controls the opening E of the exhaust gas circulating valve (11) to change within the range of E being more than or equal to 0 and less than or equal to 50 percent, and linearly increases along with the increase of the load rate R, at the moment, only the low-water-content exhaust gas from the exhaust gas circulating valve dilutes the mixed gas in the combustion chamber, so that the reduction of the temperature in the cylinder can inhibit NO from reducing x The combustion stability is not reduced because a large amount of water vapor enters the combustion chamber;
when R is more than 0.35 and less than or equal to 0.75, the combustion process electronic control unit (5) judges that the byproduct hydrogen internal combustion engine is in a medium-load operation stage, the consumption of fuel in a cylinder is increased, the combustion stability is good, the water content in the combustion chamber can be improved to promote the water gas reaction, and the water gas is directly injected to be matchedCombined control of NO with exhaust gas recirculation x Under the condition, the combustion process electronic control unit (5) starts the high-pressure water pump (13) by sending a water pump start-stop signal p, sends a water nozzle control signal c to open the water nozzle (8), so that the opening phase of the water nozzle (8) is positioned at a crank angle of 10 degrees before ignition, the first opening effective pulse width H of the water nozzle (8) is changed within 0-H and 4ms, the first opening effective pulse width H of the water nozzle (8) is linearly increased along with the increase of the load factor R, and simultaneously the combustion process electronic control unit (5) opens the exhaust gas circulating valve (11) by sending an exhaust gas circulating valve control signal a, controls the opening E of the exhaust gas circulating valve (11) to be changed within 50-E and 100%, and the opening E is linearly increased along with the increase of the load factor R;
when R is more than 0.75 and less than or equal to 1.00, the combustion process electronic control unit (5) judges that the byproduct hydrogen internal combustion engine is in a high-load operation stage, the combustion chamber is in a high-temperature state at the moment, the combustion stability is good, the combustion temperature can be controlled in a mode of increasing the water injection proportion and combining segmented water injection, the working capacity and the heat efficiency of the byproduct hydrogen internal combustion engine can be further improved by utilizing the secondary working characteristic of water, under the condition, the combustion process electronic control unit (5) opens the exhaust gas circulating valve (11) by sending an exhaust gas circulating valve control signal a, controls the opening degree of the exhaust gas circulating valve (11) to be kept at 80%, the combustion process electronic control unit (5) starts the high-pressure water pump (13) by sending a water pump start-stop signal p, sends a water nozzle control signal c to start the water nozzle (8), the first opening phase of the water nozzle (8) is positioned at a crank angle of 20 degrees before ignition, the first opening effective pulse width H of the water nozzle (8) is set according to NO concentration and CO obtained by the combustion process electronic control unit (5) according to the emission component concentration signal b, the NO concentration and the CO concentration are respectively not higher than 50ppm and 90ppm by adjusting the first opening effective pulse width H of the water nozzle (8), the combustion process electronic control unit (5) further sends out a water nozzle control signal c according to the load rate R to control the second effective injection of the water nozzle (8) to promote the dynamic property and the efficiency improvement of the secondary hydrogen production internal combustion engine by utilizing the secondary heat release of water, the opening time of the second water nozzle (8) is 10 degrees after ignition, and at the moment, the mixed gas is combusted to enter a flame propagation period, the high temperature in the flame propagation period is utilized to promote the gasification work of the secondary water spray, the temperature in the combustion chamber is further reduced through the secondary water spray, the secondary effective spray pulse width G of the water nozzle (8) is set to be more than or equal to 1ms and less than or equal to 4ms, and the secondary effective spray pulse width G is linearly increased along with the increase of the load factor R;
under the condition that R is more than 0.35 and less than or equal to 1.00, the combustion process electronic control unit (5) starts the high-pressure water pump (13) and the water nozzle (8) to enable water to be directly injected into the combustion chamber, and under the condition that the water direct injection is started, in order to ensure the combustion stability, the combustion process electronic control unit (5) calculates the cyclic variation coefficient CoVimep of the average indicated pressure according to a cylinder pressure signal d sent by a spark plug type cylinder pressure sensor (7)
Figure FDA0003828532640000031
P i,N = PdV formula 3
In the equations 2 and 3, P is a cylinder pressure obtained from a cylinder pressure sensor (7), P i,N The effective pressure is indicated for the average of the nth cycle,
Figure FDA0003828532640000032
setting M to be not less than 50 in the combustion process electronic control unit (5) for the mean indicated effective pressure mean value over M cycles from the first cycle; the relation between the internal cylinder volume V of the internal combustion engine and the crank angle is preset in the combustion process electronic control unit (5) according to the structure of the internal combustion engine body;
when the CoVimep is more than 10%, the combustion process electronic control unit (5) sends a water nozzle control signal c to reduce the first injection pulse width of the water nozzle (8) by 0.3ms compared with the last cycle in each subsequent M cycles until the CoVimep is less than or equal to 8%;
when a pure hydrogen engine is modified into a hydrogen byproduct internal combustion engine, a combustion process electronic control unit (5) controls the injection phase and the pulse width of a hydrogen nozzle (2) according to a received original engine hydrogen injection signal g, when a target torque signal m fed back by an original engine electronic control unit (4) is equal to an actual torque signal n, the combustion process electronic control unit (5) enables a hydrogen byproduct injection signal f to be consistent with the original engine hydrogen injection signal g in rule, when the target torque signal m is larger than the actual torque signal n, the combustion process electronic control unit (5) increases the hydrogen byproduct injection signal f by 0.5ms per cycle on the basis of the original engine hydrogen injection signal g until the target torque signal m is equal to the actual torque signal n on the premise that the hydrogen byproduct injection signal f is consistent with the original engine hydrogen injection signal g in initial injection phase, and when the target torque signal m is smaller than the actual torque signal n, the combustion process electronic control unit (5) reduces the hydrogen byproduct injection signal f on the basis of the original engine hydrogen injection signal g by 0.5ms until the actual torque signal n is equal to the target torque signal n per cycle.
CN202210090304.6A 2022-01-25 2022-01-25 Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method Active CN114483334B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210090304.6A CN114483334B (en) 2022-01-25 2022-01-25 Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210090304.6A CN114483334B (en) 2022-01-25 2022-01-25 Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method

Publications (2)

Publication Number Publication Date
CN114483334A CN114483334A (en) 2022-05-13
CN114483334B true CN114483334B (en) 2022-10-11

Family

ID=81474944

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210090304.6A Active CN114483334B (en) 2022-01-25 2022-01-25 Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method

Country Status (1)

Country Link
CN (1) CN114483334B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115419523A (en) * 2022-08-29 2022-12-02 中南大学 Hydrogen internal combustion engine control device based on controllable activity of mixed gas

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983882A (en) * 1973-08-03 1976-10-05 Billings Energy Research Corporation Method and apparatus for hydrogen fueled internal combustion engines
JP2010216454A (en) * 2009-03-19 2010-09-30 Toyota Motor Corp Working medium circulation type engine
GB201215041D0 (en) * 2012-08-23 2012-10-10 Gm Global Tech Operations Inc Apparatus and method for increasing the efficiency of an internal combustion engine
CN105705747A (en) * 2013-11-15 2016-06-22 丰田自动车株式会社 Condensed water supply control device for cylinder injection type internal combustion engine
JP2016217262A (en) * 2015-05-21 2016-12-22 トヨタ自動車株式会社 Internal combustion engine control device
KR20200118624A (en) * 2019-04-08 2020-10-16 한국기계연구원 Near-zero emission engine with exhaust oxygen recirculation and control method thereof
CN113266494A (en) * 2021-05-28 2021-08-17 大连理工大学 System for recycling moisture in engine exhaust gas and reinjecting air inlet
DE102020002276A1 (en) * 2020-04-11 2021-10-14 Martin Steiner Power generation system and method for speed control of a drive unit in a power supply system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7637971B2 (en) * 2005-06-29 2009-12-29 Hsu Yang Wang Hydrogen fuel supply system
JP4586780B2 (en) * 2006-09-07 2010-11-24 トヨタ自動車株式会社 Working gas circulation engine
KR101160900B1 (en) * 2010-02-11 2012-06-28 국방과학연구소 Hydrogen fueled closed-cycle combustion system and method with recirculation of exhaust gas
JP2016501334A (en) * 2012-11-20 2016-01-18 ノストラム エナジー ピーティーイー．リミテッドＮｏｓｔｒｕｍ Ｅｎｅｒｇｙ Ｐｔｅ．Ｌｔｄ． Internally cooled exhaust gas recirculation system and method for internal combustion engines
US10330028B2 (en) * 2015-10-20 2019-06-25 Ford Global Technologies, Llc Method and system for determining knock control fluid composition
US10612497B2 (en) * 2018-04-24 2020-04-07 Saudi Arabian Oil Company Water injection to increase hydrogen production by on-board reforming of fuel for automotive internal combustion engines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983882A (en) * 1973-08-03 1976-10-05 Billings Energy Research Corporation Method and apparatus for hydrogen fueled internal combustion engines
JP2010216454A (en) * 2009-03-19 2010-09-30 Toyota Motor Corp Working medium circulation type engine
GB201215041D0 (en) * 2012-08-23 2012-10-10 Gm Global Tech Operations Inc Apparatus and method for increasing the efficiency of an internal combustion engine
CN105705747A (en) * 2013-11-15 2016-06-22 丰田自动车株式会社 Condensed water supply control device for cylinder injection type internal combustion engine
JP2016217262A (en) * 2015-05-21 2016-12-22 トヨタ自動車株式会社 Internal combustion engine control device
KR20200118624A (en) * 2019-04-08 2020-10-16 한국기계연구원 Near-zero emission engine with exhaust oxygen recirculation and control method thereof
DE102020002276A1 (en) * 2020-04-11 2021-10-14 Martin Steiner Power generation system and method for speed control of a drive unit in a power supply system
CN113266494A (en) * 2021-05-28 2021-08-17 大连理工大学 System for recycling moisture in engine exhaust gas and reinjecting air inlet

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
喷水温度对内燃兰金循环燃烧过程影响的试验研究;于潇等;《工程热物理学报》;20140115(第01期);全文 *
掺氢汽油机燃烧与排放特性的试验研究;汪硕峰;《中国博士学位论文全文数据库工程科技Ⅱ辑》;20140315(第3期);C039-9 *
氢内燃机在汽车上的应用;纪常伟;《商用汽车》;20080704(第07期);全文 *
混氢汽油机的燃烧及排放特性试验;纪常伟等;《北京工业大学学报》;20081215(第12期);全文 *

Also Published As

Publication number Publication date
CN114483334A (en) 2022-05-13

Similar Documents

Publication Publication Date Title
CN111206999A (en) Electric control diesel-methanol dual-fuel engine control system and method based on EGR (exhaust gas recirculation) technology
CN111997746B (en) Air inlet channel and direct injection composite hydrogen-doped gasoline fuel rotor machine and control method thereof
CN110318891B (en) Multi-mode combustion organization method for natural gas/diesel dual-fuel engine
US20080022680A1 (en) Apparatus and method for increasing the hydrogen content of recirculated exhaust gas in fuel injected engines
WO2007027327A2 (en) Increasing hydrogen content in egr system
CN105673199A (en) Hydrogen-doped inlet air and oxygen-enriched gasoline engine with EGR and combustion control method
CN111472891A (en) Diesel ignition natural gas engine combustion system and control method thereof
CN111997744B (en) Pure oxyhydrogen fuel two-stroke rotor machine capable of spraying water in cylinder and control method thereof
CN110552805A (en) combustion control system and method for hydrogen repeated direct injection internal combustion engine
CN114183262A (en) Direct-injection hydrogen internal combustion engine in jet ignition cylinder of pre-combustion chamber and control method
CN114483334B (en) Byproduct hydrogen internal combustion engine combining exhaust gas recirculation with water direct injection and method
CN114439608A (en) Water circulation in-cylinder water spray hydrogen internal combustion engine and automobile
CN112855358A (en) Special gas engine control system for gas heat pump
CN109707505B (en) Zero-nitrogen engine based on water injection control pressure rise rate oxygen closed cycle and control method thereof
CN111197532A (en) Hydrogen/methanol composite fuel engine
CN117514534A (en) Ammonia diesel engine with air inlet channel for multi-point liquid ammonia injection and post-treatment ammonia supply system
CN115111089A (en) Pre-combustion chamber type ammonia fuel engine system
CN209398491U (en) A kind of control system that can effectively expand gasoline compression ignition high-efficiency cleaning range of operation
CN102748143B (en) Control method for power system of dimethyl ether/hydrogen internal combustion engine
CN111456845B (en) Clean zero-carbon-emission spark ignition type internal combustion engine and control method thereof
CN214997915U (en) Hydrogen ethanol engine for range extender
CN214997916U (en) Hydrogen and gasoline dual-purpose fuel engine
CN212003356U (en) Electric control diesel-methanol dual-fuel engine control system based on EGR
CN114576028A (en) Hydrogen-doped direct injection ammonia engine in cylinder and control method thereof
CN114060153A (en) Fuel supply system and control method of dual-fuel 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