CN114776486A - Exhaust gas water circulation direct injection system of hydrogen engine, control method and automobile - Google Patents
Exhaust gas water circulation direct injection system of hydrogen engine, control method and automobile Download PDFInfo
- Publication number
- CN114776486A CN114776486A CN202210190354.1A CN202210190354A CN114776486A CN 114776486 A CN114776486 A CN 114776486A CN 202210190354 A CN202210190354 A CN 202210190354A CN 114776486 A CN114776486 A CN 114776486A
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- engine
- water
- pressure
- channel
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0206—Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
-
- 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
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief 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
- F02M25/0221—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
- F02M25/032—Producing and adding steam
- F02M25/038—Producing and adding steam into the cylinder or the pre-combustion chamber
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (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 hydrogen engine exhaust gas water circulation direct injection system, which comprises: the system comprises an engine control unit ECU, a hydrogen tank, a hydrogen gas rail, a high-pressure water rail, an integrated pressure regulating module and a dual-channel ejector, wherein the dual-channel ejector only sprays hydrogen or simultaneously sprays hydrogen and waste water into an engine cylinder, and the pressure regulating module of the integrated device is provided with a water channel for circulating waste water and a hydrogen channel for circulating hydrogen; the hydrogen tank, the hydrogen channel of the integrated pressure regulating module, the hydrogen rail and the two-channel ejector are communicated to form a hydrogen flow channel for hydrogen to flow into an engine cylinder; the waste gas outlet of each engine cylinder, the water channel of the integrated pressure regulating module, the high-pressure water rail and the two-channel ejector are communicated to form a waste water circulating flow channel for the waste gas to flow into the engine cylinders; and the engine control unit ECU is electrically connected with the two-channel ejector and the integrated pressure regulating module.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an exhaust gas water circulation direct injection system of a hydrogen engine, a control method and an automobile.
Background
In recent years, hydrogen utilization is mainly focused on the field of fuel cells, however, with the conventional automobile power conversion, hydrogen engines also show considerable prospects. The development of the hydrogen engine can utilize the huge industrial foundation of the existing internal combustion engine and the development experience accumulated over the years, the development cost is obviously lower compared with that of a fuel cell, and along with the rapid development of the high thermal efficiency technology of the engine in recent years, the energy conversion efficiency of the hydrogen engine is expected to gradually approach the fuel cell, more importantly, the hydrogen engine has lower requirement on the purity of the hydrogen fuel and stronger applicability, and the cost of links such as hydrogen production, hydrogen storage, hydrogen transportation and the like can be greatly reduced. By combining the factors, the hydrogen engine has a wide application prospect and becomes a research hotspot of enterprises and research institutions.
The hydrogen lean-burn capability is strong, the combustion rate is high, and the combustion temperature is high, so in order to improve the thermal efficiency of the hydrogen engine, reduce the thermal load of the engine and improve the NVH of the engine, the hydrogen engine mostly adopts a lean-burn mode, and at the moment, in order to ensure sufficient air dilution, the engine needs to have strong supercharging capability. Hydrogen has a low volumetric energy density, and therefore, in order to obtain a high power output, direct injection is usually employed. Furthermore, while hydrogen engines can achieve zero carbon emissions, they still do not avoid the presence of NOx emissions, and to meet current stringent emission regulations, NOx lean aftertreatment systems must be retrofitted. Lean burn aftertreatment systems are typically less efficient at converting NOx, and therefore in order to meet regulatory requirements and reduce aftertreatment costs, it is desirable to control raw NOx emissions as effectively as possible. Patent CN109707505A proposes to further achieve zero NOx emission by pure oxygen combustion, but this method requires industrialization of both hydrogen and oxygen in practical engineering, and the feasibility is low, and in this patent, an air passage water spraying mode is mentioned, but its main purpose is to suppress the pressure rise rate, and since the air passage water spraying mode has a limited effect on reducing the temperature in the cylinder, the effect on reducing the NOx emission of the conventional hydrogen engine is also limited. In other studies, hydrogen engines usually also adopt an exhaust gas recirculation mode to improve combustion and emission, but on one hand, water in the recirculated exhaust gas exists in a gaseous state, so that the fresh air charging efficiency is reduced, and the power output is reduced, and on the other hand, the effect of the water in a gaseous state on reducing the temperature of the intake air or the temperature in the cylinder is poorer than that of a liquid water injection mode.
Disclosure of Invention
In order to solve the problems, the invention provides an exhaust gas water circulation direct injection system of a hydrogen engine, a control method and an automobile.
The technical scheme of the invention is as follows:
the invention provides a hydrogen engine exhaust gas water circulation direct injection system, which comprises:
the system comprises an engine control unit ECU, a hydrogen tank, a hydrogen gas rail, a high-pressure water rail, an integrated pressure regulating module and a dual-channel ejector, wherein the dual-channel ejector only sprays hydrogen or simultaneously sprays hydrogen and waste water into an engine cylinder, and the pressure regulating module of the integrated device is provided with a water channel for circulating waste water and a hydrogen channel for circulating hydrogen;
the hydrogen tank, the hydrogen channel of the integrated pressure regulating module, the hydrogen rail and the two-channel injector are communicated to form a hydrogen flow channel for hydrogen to flow into an engine cylinder;
the waste gas outlet of each engine cylinder, the water channel of the integrated pressure regulating module, the high-pressure water rail and the two-channel ejector are communicated to form a waste water circulating flow channel for the waste gas to flow into the engine cylinders;
the engine control unit ECU is electrically connected with the dual-channel ejector and the integrated pressure regulating module, and is controlled by the integrated pressure regulating module based on the real-time load working condition of the engine, so that the integrated pressure regulating module regulates the pressure of the gas rail entering the hydrogen gas rail and/or the pressure of the wastewater rail entering the high-pressure water rail.
Preferably, the hydrogen flow channel further includes:
the system comprises a first supercharger, a catalyst, an electric control three-way valve, a tail pipe, an exhaust gas cooler and a high-pressure mechanical water pump, wherein the first supercharger, the catalyst and the electric control three-way valve are communicated with an exhaust gas outlet of an engine cylinder;
a second outlet of the exhaust gas cooler is communicated with the tail pipe, and a third outlet of the exhaust gas cooler is communicated with a water channel inlet of the integrated pressure regulating module;
the outlet of the high-pressure mechanical water pump is communicated with the inlet of the high-pressure water rail;
the engine control unit ECU is electrically connected with the electric control three-way valve and the high-pressure mechanical water pump;
the engine control unit ECU controls the electric control three-way valve to enable the engine waste water to flow into or not flow into the high-pressure water rail;
and the engine control unit ECU controls the integrated pressure regulating valve to regulate the water pressure of the wastewater pumped into the high-pressure water rail through the high-pressure mechanical water pump.
Preferably, the wastewater circulation flow path further includes:
the pressure reducing valve is communicated with an outlet of the hydrogen tank, and an outlet of the pressure reducing valve is communicated with an inlet of the hydrogen rail;
the engine control unit ECU is electrically connected with the pressure reducing valve;
the engine control unit ECU controls the pressure reducing valve to reduce the pressure of the hydrogen flowing out of the hydrogen tank to a preset standard range;
and the engine control unit ECU controls the hydrogen channel of the integrated pressure regulating module to regulate the pressure of hydrogen flowing into the hydrogen rail through the pressure reducing valve.
Preferably, the system further comprises: the engine control unit ECU is electrically connected with each spark plug. Preferably, the system further comprises:
an air intake circuit for delivering fresh air to the engine cylinders.
The invention provides a hydrogen engine waste water circulation direct injection control method, which is applied to the hydrogen engine waste gas water circulation direct injection system and comprises the following steps:
step S1, after the engine is started, judging the current load working condition of the engine based on the average effective pressure of the engine;
step S2, if the current load working condition of the engine is a small load working condition, controlling the electric control three-way valve to be communicated to the water flow passage of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be closed, and controlling the water passage of the integrated pressure regulating module to be closed; controlling a hydrogen channel of the integrated pressure regulating module to enable the hydrogen engine to burn in a layered lean combustion mode; carrying out hydrogen injection on the dual-channel injector to control the hydrogen injection time within a first preset range;
step S3, if the current load working condition of the engine is a medium load working condition, controlling the electric control three-way valve to be communicated to the water flow channel of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be started, and controlling the water channel of the integrated pressure regulating module to be started; controlling a hydrogen channel of the integrated pressure regulating module to be opened, so that the hydrogen engine adopts a quasi-homogeneous lean combustion mode for combustion; controlling the dual-channel ejector to perform hydrogen ejection and wastewater ejection, controlling the hydrogen ejection time to be at a preset time after an inlet valve is closed, controlling the hydrogen ejection pressure to be above a preset pressure, controlling the wastewater circulation ejection time to be within a second preset range, and controlling the wastewater ejection pressure to be within a preset pressure range;
step S4, if the current load working condition of the engine is a large load working condition, controlling the electric control three-way valve to be communicated to the water flow channel of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be started, and controlling the water channel of the integrated pressure regulating module to be started; controlling a hydrogen channel of the integrated pressure regulating module to enable the hydrogen engine to burn in an equivalent combustion mode; control the binary channels sprayer carries out hydrogen injection and waste water injection, makes hydrogen injection moment control predetermine the moment after the (air) intake valve closes, makes hydrogen injection pressure control more than predetermineeing the pressure, makes waste water circulation injection moment control predetermine the within range at the second, and waste water injection pressure control is predetermine the pressure range.
Preferably, if the current load condition of the engine is a small load condition, the method further comprises:
step S5, collecting the amount of condensed water in the waste water cooler by an engine control unit ECU through a liquid level sensor;
step S6, if the amount of condensed water in the wastewater cooler exceeds a preset upper limit value, controlling the electric control three-way valve to be communicated to an exhaust tail pipe, and discharging all tail gas;
and step S7, if the amount of condensed water in the wastewater cooler is lower than a preset lower limit value, controlling the electric control three-way valve to be communicated to a water flow channel of the integrated pressure regulating module.
The invention also provides an automobile comprising the hydrogen engine exhaust gas water circulation direct injection system.
In summary, the beneficial effects of the invention are as follows: by designing the waste gas water circulation direct injection system in the hydrogen engine, the water generated after the hydrogen combustion can be fully utilized to effectively improve the high-load combustion in the hydrogen engine, reduce the heat transfer loss, further improve the thermal efficiency of the engine and inhibit the original emission of NOx.
Drawings
FIG. 1 is a schematic diagram of an EGR-water cycle direct injection system in an embodiment of the present invention;
1-an electrically controlled three-way valve; 2-an exhaust gas cooler; 3-high pressure mechanical water pump; 4-an integrated pressure regulating module; 5-a pressure reducing valve; 6-hydrogen gas rail; 7-two-channel ejector; 8-a spark plug; 9-high pressure water rail.
Detailed Description
To further illustrate the structural and functional features of the present invention, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments, but it should be understood that the scope of the present invention is not limited by the specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a hydrogen engine exhaust gas water circulation direct injection system, which mainly includes an engine control unit ECU, a hydrogen tank, an electrically controlled three-way valve 1, an exhaust gas cooler 2, a high-pressure mechanical water pump 3, an integrated pressure regulating module 4, a dual-channel injector 7 for injecting only hydrogen or simultaneously injecting hydrogen and wastewater into an engine cylinder, a high-pressure water rail 9, and a spark plug. The integrator pressure regulating module is provided with a water channel for wastewater circulation and a hydrogen channel for hydrogen circulation. The engine control unit ECU is electrically connected to the two-channel injector 7, the integrated pressure regulating module 4, and each of the spark plugs 8. The ECU can be based on the real-time load working condition of the engine, and the integrated pressure regulating module 4 is controlled to regulate the pressure of the gas rail entering the hydrogen gas rail 6 and/or the pressure of the wastewater rail entering the high-pressure water rail 9 by the integrated pressure regulating module 4.
Further, the inlet of the electric control three-way valve 1 is connected with the outlet of the first catalyst, two outlets of the electric control three-way valve 1 are respectively connected with the inlet of the exhaust gas cooler 2 and the exhaust tail pipe, and the outlet of the exhaust gas cooler 2 is also connected with the exhaust tail pipe. The electric control three-way valve 1 is mainly used for controlling the exhaust direction and the communication time of the engine. The exhaust gas cooler 2 is mainly used to condense and store gaseous water in the exhaust gas. The integrated pressure regulating module 4 is mainly used for regulating the rail pressure of the hydrogen gas rail 6 and the high-pressure water rail 9, and further controlling the injection pressure of the hydrogen and the waste gas circulating water.
In this embodiment, the integrated pressure regulating module 4 is a structure integrated with two electric control valves, and the two electric control valves are independently controlled to regulate the hydrogen injection pressure and the wastewater injection pressure.
And the condensed water in the waste gas cooler 2 is pressurized by the high-pressure mechanical water pump 3 and then enters the high-pressure water rail 9, and the rail pressure of the high-pressure water rail 9 is adjusted by the integrated pressure adjusting module 4. The two-channel ejector 7 is respectively connected with the high-pressure water rail 9 and the hydrogen gas rail 6 and is used for independently controlling the circulating water of the waste gas and the hydrogen gas. The dual-channel ejector structure has many similar patents, such as CN110344976A, CN110905703 and the like, and the dual-channel ejector structure is only used as a means for realizing water injection control in a cylinder of a hydrogen engine and one of parts forming an exhaust gas water circulation direct injection system, and does not independently create and protect patent points.
In this example, the hydrogen tank, the hydrogen channel of the integrated pressure regulating module 4, the hydrogen rail 6 and the two-channel ejector 7 are communicated with each other to form a hydrogen flow channel for hydrogen to flow into the cylinder of the engine, and the hydrogen flow channel further includes: the system comprises a first supercharger, a catalyst, an electric control three-way valve 1, an exhaust tail pipe, an exhaust gas cooler 2 and a high-pressure mechanical water pump 3, wherein the first supercharger, the catalyst and the electric control three-way valve 1 are communicated with an exhaust gas outlet of an engine cylinder; a second outlet of the exhaust gas cooler 2 is communicated with the tail pipe, and a third outlet of the exhaust gas cooler 2 is communicated with a water channel inlet of the integrated pressure regulating module 4; the outlet of the high-pressure mechanical water pump 3 is communicated with the inlet of the high-pressure water rail 9; the engine control unit ECU is electrically connected with the electrically controlled three-way valve 1 and the high-pressure mechanical water pump 3; the engine control unit ECU controls the electric control three-way valve 1 to make the engine waste water flow into or not flow into the high-pressure water rail 9; the engine control unit ECU controls the integrated pressure regulating valve to regulate the pressure of the wastewater pumped into the high-pressure water rail 9 through the high-pressure mechanical water pump 3.
The exhaust gas outlet of each engine cylinder, the water passageway of integrated form pressure regulating module 4, high pressure water rail 9 with communicate between the binary channels sprayer 7 and form the waste water circulation runner that supplies waste gas to flow into in the engine cylinder, waste water circulation runner still includes: a pressure reducing valve 5 communicated with an outlet of the hydrogen tank, wherein an outlet of the pressure reducing valve 5 is communicated with an inlet of the hydrogen gas rail 6; the engine control unit ECU is electrically connected with the pressure reducing valve 5; the engine control unit ECU controls the pressure reducing valve 5 to reduce the pressure of the hydrogen flowing out of the hydrogen tank to a preset standard range; the engine control unit ECU adjusts the pressure of hydrogen flowing into the hydrogen rail 6 through the pressure reducing valve 5 by controlling the hydrogen channel of the integrated pressure regulating module 4.
Of course, the system in this embodiment further includes: an air intake circuit for delivering fresh air to the engine cylinders. The air intake circuit is composed of an air filter, a supercharger intercooler, a throttle valve, an intake manifold and the like, and adopts the conventional technology.
Further, the invention also provides a control strategy of the hydrogen engine exhaust gas water circulation direct injection system, which mainly comprises the following steps:
1. when the engine control unit ECU determines that the engine is in a low-load working condition (generally the average effective pressure BMEP of the engine is less than 5 bar), the high-pressure water injection system of the exhaust gas water circulation direct injection system does not work, and at the moment, the electronic control three-way valve 1 is mainly controlled to store the condensed water in the exhaust gas cooler 2. Under the working condition of small load, the hydrogen engine adopts a layered lean combustion mode, and the hydrogen injection time is controlled to be near 100 degrees CA ATDC (within a first preset range which is formed by the upper and lower setting ranges of 100 degrees CA ATDC), so that the combustion stability of the engine is improved. And under the working condition, after the engine is started, the engine control unit ECU detects the amount of condensed water in the exhaust gas cooler 2 through a liquid level sensor, when the amount of condensed water in the exhaust gas cooler 2 exceeds a preset upper limit value, the electronic control three-way valve 1 is controlled to disconnect a pipeline connected with the exhaust gas cooler 2, so that exhaust gas directly enters an exhaust tail pipe, when the amount of condensed water is lower than a preset lower limit value, the electronic control three-way valve 1 is controlled to connect the exhaust gas cooler 2, the amount of condensed water is increased, and the pipeline is disconnected after the amount of condensed water reaches the upper limit value again.
2. The engine control unit ECU starts to operate after determining that the engine is currently in a medium load condition (generally, the average effective pressure BMEP of the engine is greater than 5 bar), and the high-pressure water injection system (i.e., the waste water circulation flow channel integrated passage) in the hydrogen engine waste gas water circulation direct injection system, and the engine control unit ECU controls the injection of the hydrogen gas and the waste gas circulation water respectively through the two-channel injector 7 and the integrated pressure regulating module 4. Under the medium load working condition, the hydrogen engine adopts a quasi-homogeneous lean combustion mode, the hydrogen injection time is controlled to be 5 degrees CA (preset time) after an air inlet valve is closed, and the injection pressure is controlled to be more than 30-40bar (preset pressure), so that the uniformity degree of mixed gas is improved, the increase of NOx emission caused by local over-concentration is avoided, and the backfire phenomenon is avoided. The spraying time of the waste gas circulating water is controlled between 90-150 CA ATDC (a second preset range), the spraying pressure is controlled between 15-25MPa (a preset pressure range), on one hand, the knocking tendency of the engine is effectively reduced, the combustion phase is improved, a water vapor heat insulation layer is formed near the top surface of the piston, the heat loss brought away by the piston is reduced, the heat efficiency of the engine is improved, on the other hand, the reduction of the in-cylinder combustion temperature caused by water spraying can also greatly reduce the original emission of NOx.
3. When the engine control unit ECU determines that the engine is in a large-load working condition at present, the hydrogen engine adopts an equivalent combustion mode to improve the power output of the engine, and the working mode of the waste gas water circulation direct injection system is similar to that of a medium-load working condition, so that the running reliability of the engine can be improved, and the original emission of NOx can be reduced.
It should be noted that, the above control strategy mainly points out key control parameters and recommended intervals of the exhaust gas-water circulation direct injection system, and in the specific application process, the key control parameters and the recommended intervals need to be optimized in combination with specific structural parameters and limitations such as the engine compression ratio, the single-cylinder displacement, the cylinder body strength and the like, and other related control parameters such as the use condition area division, the high-pressure water spray ratio, the injection angle and the like are optimized synchronously.
In conclusion, the beneficial effects of the invention are as follows: by designing the waste gas water circulation direct injection system in the hydrogen engine, the water generated after the hydrogen combustion can be fully utilized to effectively improve the high-load combustion in the hydrogen engine, reduce the heat transfer loss, further improve the thermal efficiency of the engine and inhibit the original emission of NOx.
The invention also provides an automobile comprising the hydrogen engine exhaust gas water circulation direct injection system.
Claims (8)
1. A hydrogen engine exhaust gas water cycle direct injection system, comprising:
the system comprises an engine control unit ECU, a hydrogen tank, a hydrogen gas rail, a high-pressure water rail, an integrated pressure regulating module and a dual-channel ejector, wherein the dual-channel ejector only sprays hydrogen or simultaneously sprays hydrogen and waste water into an engine cylinder, and the pressure regulating module of the integrated device is provided with a water channel for circulating waste water and a hydrogen channel for circulating hydrogen;
the hydrogen tank, the hydrogen channel of the integrated pressure regulating module, the hydrogen rail and the two-channel ejector are communicated to form a hydrogen flow channel for hydrogen to flow into an engine cylinder;
the waste gas outlet of each engine cylinder, the water channel of the integrated pressure regulating module, the high-pressure water rail and the two-channel ejector are communicated to form a waste water circulating flow channel for the waste gas to flow into the engine cylinders;
the engine control unit ECU is electrically connected with the dual-channel ejector and the integrated pressure regulating module, and is controlled by the integrated pressure regulating module based on the real-time load working condition of the engine, so that the integrated pressure regulating module regulates the pressure of the gas rail entering the hydrogen gas rail and/or the pressure of the wastewater rail entering the high-pressure water rail.
2. The hydrogen engine exhaust gas water-cycle direct injection system of claim 1, wherein the hydrogen gas flowpath further comprises:
the system comprises a first supercharger, a catalyst, an electric control three-way valve, a tail pipe, an exhaust gas cooler and a high-pressure mechanical water pump, wherein the first supercharger, the catalyst and the electric control three-way valve are communicated with an exhaust gas outlet of an engine cylinder;
a second outlet of the exhaust gas cooler is communicated with the tail pipe, and a third outlet of the exhaust gas cooler is communicated with an inlet of the water channel of the integrated pressure regulating module;
the outlet of the high-pressure mechanical water pump is communicated with the inlet of the high-pressure water rail;
the engine control unit ECU is electrically connected with the electric control three-way valve and the high-pressure mechanical water pump;
the engine control unit ECU controls the electric control three-way valve to make the engine wastewater flow into or not flow into the high-pressure water rail;
and the engine control unit ECU controls the integrated pressure regulating valve to regulate the water pressure of the wastewater pumped into the high-pressure water rail through the high-pressure mechanical water pump.
3. The hydrogen engine exhaust gas water circulation direct injection system according to claim 2, wherein the waste water circulation flow passage further comprises:
the pressure reducing valve is communicated with an outlet of the hydrogen tank, and an outlet of the pressure reducing valve is communicated with an inlet of the hydrogen rail;
the engine control unit ECU is electrically connected with the pressure reducing valve;
the engine control unit ECU controls the pressure reducing valve to reduce the pressure of the hydrogen flowing out of the hydrogen tank to a preset standard range;
and the engine control unit ECU controls the hydrogen channel of the integrated pressure regulating module to regulate the pressure of hydrogen flowing into the hydrogen rail through the pressure reducing valve.
4. The hydrogen engine exhaust gas water-cycle direct injection system of claim 3, further comprising: the engine control unit ECU is electrically connected with each spark plug.
5. The hydrogen engine exhaust gas water-cycle direct injection system of claim 4, further comprising:
an air intake circuit for delivering fresh air to the engine cylinders.
6. A hydrogen engine waste water circulation direct injection control method is applied to the hydrogen engine exhaust gas water circulation direct injection system of claim 5, and is characterized by comprising the following steps:
step S1, after the engine is started, judging the current load working condition of the engine based on the average effective pressure of the engine;
step S2, if the current load working condition of the engine is a small load working condition, controlling the electric control three-way valve to be conducted to the water flow channel of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be closed, and controlling the water channel of the integrated pressure regulating module to be closed; controlling a hydrogen channel of the integrated pressure regulating module to enable the hydrogen engine to burn in a layered lean combustion mode; carrying out hydrogen injection on the dual-channel injector, and controlling the hydrogen injection time within a first preset range;
step S3, if the current load working condition of the engine is a middle load working condition, controlling the electric control three-way valve to be conducted to the water flow channel of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be started, and controlling the water channel of the integrated pressure regulating module to be started; controlling a hydrogen channel of the integrated pressure regulating module to be opened, so that the hydrogen engine adopts a quasi-homogeneous lean combustion mode for combustion; controlling the dual-channel injector to perform hydrogen injection and wastewater injection, controlling the hydrogen injection moment at a preset moment after the inlet valve is closed, controlling the hydrogen injection pressure above a preset pressure, controlling the wastewater circulating injection moment within a second preset range, and controlling the wastewater injection pressure within a preset pressure range;
step S4, if the current load working condition of the engine is a large load working condition, controlling the electric control three-way valve to be communicated to the water flow channel of the integrated pressure regulating module, controlling the high-pressure mechanical water pump to be started, and controlling the water channel of the integrated pressure regulating module to be started; controlling a hydrogen channel of the integrated pressure regulating module to enable the hydrogen engine to burn in an equivalent burning mode; control the binary channels sprayer carries out hydrogen injection and waste water injection, makes hydrogen injection moment control predetermine the moment after the (air) intake valve closes, makes hydrogen injection pressure control more than predetermineeing the pressure, makes waste water circulation injection moment control predetermine the within range at the second, and waste water injection pressure control is predetermine the pressure range.
7. The hydrogen engine waste water circulation direct injection control method is characterized in that if the current load condition of the engine is a small load condition, the method further comprises the following steps:
step S5, collecting the amount of condensed water in the waste water cooler by an engine control unit ECU through a liquid level sensor;
step S6, if the amount of condensed water in the wastewater cooler exceeds a preset upper limit value, controlling the electric control three-way valve to be communicated to an exhaust tail pipe, and discharging all tail gas;
and step S7, if the amount of the condensed water in the wastewater cooler is lower than a preset lower limit value, controlling the electric control three-way valve to be communicated to a water flow channel of the integrated pressure regulating module.
8. An automobile comprising the hydrogen engine exhaust gas water circulation direct injection system according to claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190354.1A CN114776486B (en) | 2022-02-28 | 2022-02-28 | Hydrogen engine exhaust gas water circulation direct injection system, control method and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190354.1A CN114776486B (en) | 2022-02-28 | 2022-02-28 | Hydrogen engine exhaust gas water circulation direct injection system, control method and automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114776486A true CN114776486A (en) | 2022-07-22 |
| CN114776486B CN114776486B (en) | 2023-08-22 |
Family
ID=82422549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210190354.1A Active CN114776486B (en) | 2022-02-28 | 2022-02-28 | Hydrogen engine exhaust gas water circulation direct injection system, control method and automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114776486B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800617A (en) * | 2006-01-13 | 2006-07-12 | 镇江江奎科技有限公司 | Apparatus and method for controlling internal combustion engine with hydrogen fuel |
| CN101260846A (en) * | 2007-12-27 | 2008-09-10 | 奇瑞汽车股份有限公司 | Hydrogen engines and its burnt gas jet method |
| CN105114174A (en) * | 2015-09-16 | 2015-12-02 | 吉林大学 | Lean-burn gas duel-fuel spark-ignition-type internal combustion engine based on EGR system and control method |
| US20160097350A1 (en) * | 2012-11-01 | 2016-04-07 | Jared William Brown | High-enthalpy fluid injection integrated with spark plug |
| CN108506119A (en) * | 2017-02-24 | 2018-09-07 | 联合汽车电子有限公司 | External exhaust gas recirculation system and its working method |
| CN111379634A (en) * | 2018-12-27 | 2020-07-07 | 广州汽车集团股份有限公司 | Lean-burn engine and automobile |
| CN113446137A (en) * | 2021-07-21 | 2021-09-28 | 大连理工大学 | Hydrogen-ammonia dual-fuel engine system for catalytically reforming methanol to supply hydrogen by waste gas waste heat |
-
2022
- 2022-02-28 CN CN202210190354.1A patent/CN114776486B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800617A (en) * | 2006-01-13 | 2006-07-12 | 镇江江奎科技有限公司 | Apparatus and method for controlling internal combustion engine with hydrogen fuel |
| CN101260846A (en) * | 2007-12-27 | 2008-09-10 | 奇瑞汽车股份有限公司 | Hydrogen engines and its burnt gas jet method |
| US20160097350A1 (en) * | 2012-11-01 | 2016-04-07 | Jared William Brown | High-enthalpy fluid injection integrated with spark plug |
| CN105114174A (en) * | 2015-09-16 | 2015-12-02 | 吉林大学 | Lean-burn gas duel-fuel spark-ignition-type internal combustion engine based on EGR system and control method |
| CN108506119A (en) * | 2017-02-24 | 2018-09-07 | 联合汽车电子有限公司 | External exhaust gas recirculation system and its working method |
| CN111379634A (en) * | 2018-12-27 | 2020-07-07 | 广州汽车集团股份有限公司 | Lean-burn engine and automobile |
| CN113446137A (en) * | 2021-07-21 | 2021-09-28 | 大连理工大学 | Hydrogen-ammonia dual-fuel engine system for catalytically reforming methanol to supply hydrogen by waste gas waste heat |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114776486B (en) | 2023-08-22 |
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 | |
| EP2557300B1 (en) | Combustion control device for an internal combustion engine | |
| WO2017028389A1 (en) | New concept engine based on controllable combustion reaction path and control method therefor | |
| CN109538347B (en) | Control method capable of realizing efficient clean compression ignition of gasoline in full working condition range | |
| CN102278216A (en) | Multimode multi-fuel combustion system | |
| CN104500247B (en) | Combustion control method for all-condition plane of direct-injection compression-ignition engine | |
| CN109296469B (en) | Reaction activity control-based dual-fuel engine combustion control method | |
| CN105673199A (en) | Hydrogen-doped inlet air and oxygen-enriched gasoline engine with EGR and combustion control method | |
| CN108843446B (en) | Gasoline engine combustion control method suitable for medium and heavy duty vehicle and gasoline engine | |
| CN107939517B (en) | Jet ignition-based engine ultrahigh compression ratio combustion control device and method | |
| CN114439608A (en) | Water circulation in-cylinder water spray hydrogen internal combustion engine and automobile | |
| CN111379634B (en) | Lean-burn engine and automobile | |
| CN103225550A (en) | Combustion control method of novel gasoline homogenous charge compression ignition engine and implementation device of method | |
| CN108049991A (en) | The engine block of the double injections of hot water mixing in a kind of outer cold water tank of cylinder | |
| CN111336006B (en) | Multi-fuel intelligent charge compression combustion engine | |
| CN111305968B (en) | Fuel injection method and device for multi-fuel charge compression combustion engine | |
| CN114776486B (en) | Hydrogen engine exhaust gas water circulation direct injection system, control method and automobile | |
| CN116201630B (en) | Hydrogen engine combustion system and combustion mode control method | |
| CN111042955B (en) | Engine system and combustion method | |
| CN105508087B (en) | Series parallel type gas recirculation system and its application method | |
| CN107989718A (en) | The engine block of the double injections of cold water mix inside and outside a kind of cylinder | |
| CN111365133B (en) | Multi-fuel charging-quantity compression combustion engine combustion system and control method | |
| CN214997915U (en) | Hydrogen ethanol engine for range extender | |
| CN115962052A (en) | Ammonia-diesel dual-fuel engine adopting double-loop linkage supercharging EGR and combustion method thereof | |
| CN106168172B (en) | A kind of online fuel reforming variable combustion mode engine and control method |
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 |