CN109339996B - Air inlet system, air inlet control method and control device of large-cylinder-diameter gas engine - Google Patents
Air inlet system, air inlet control method and control device of large-cylinder-diameter gas engine Download PDFInfo
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- CN109339996B CN109339996B CN201811267428.7A CN201811267428A CN109339996B CN 109339996 B CN109339996 B CN 109339996B CN 201811267428 A CN201811267428 A CN 201811267428A CN 109339996 B CN109339996 B CN 109339996B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10268—Heating, cooling or thermal insulating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D2200/1012—Engine speed gradient
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The application discloses an air inlet system, an air inlet control method and a control device of a large-cylinder-diameter gas machine. The first intake passage supports an intake mode of premixed intake air before supercharging. By closing the controllable bypass valve for air intake bypass and cooperating with the control of the opening of the throttle valve, the mixed air can be quickly introduced into the cylinder. The second intake passage supports an intake mode in which intake air is injected from an intake port. By controlling the fuel gas injection valve, fuel gas can be directly injected into the cylinder, so that the air-fuel ratio of mixed gas in the cylinder is quickly thickened. Therefore, the air intake system of the large-cylinder-diameter gas engine in the embodiment of the application supports an air intake mode capable of simultaneously realizing rapid increase of air intake quantity in the cylinder and rapid change of the air-fuel ratio of the mixed gas, and effectively solves the technical problem of poor transient response performance of the large-cylinder-diameter gas engine.
Description
Technical Field
The application relates to the field of engine control, in particular to an air inlet system, an air inlet control method and a control device of a large-cylinder-diameter gas engine.
Background
The large-cylinder-diameter gas engine is an engine using gas as fuel. With the development of technology and the gradual improvement of environmental protection requirements, large-cylinder-diameter gas engines have been widely applied to various fields.
The transient response performance of the large-cylinder-diameter gas engine is an important index for measuring the performance of the large-cylinder-diameter gas engine, and the transient response performance refers to the change of the rotating speed of the engine when the load changes and the time required from an initial state to a stable state. For a large cylinder diameter gas engine, the intake air amount and the air-fuel ratio are two key factors that affect the transient response performance.
However, the air intake system of the current large-bore gas engine supports an air intake mode of pre-mixing air intake before supercharging. The pre-mixing air intake before supercharging refers to an air intake mode that fuel gas and air are mixed before the supercharger and enter the cylinder after being supercharged by the supercharger. Under the air inlet mode, when the large-cylinder-diameter gas engine is in a transient working condition that the load is rapidly increased, the air quantity entering the cylinder cannot be rapidly increased, and the air-fuel ratio of the mixed gas entering the cylinder cannot be rapidly changed, so that the transient response performance of the large-cylinder-diameter gas engine is poor.
Disclosure of Invention
In view of this, the present application provides an air intake system, an air intake control method and a control device for a large-cylinder-diameter gas engine, so as to solve the problem of poor transient response performance of the existing large-cylinder-diameter gas engine.
To achieve the above object, in one aspect, the present application provides an intake system of a large cylinder diameter gas engine, including:
the air inlet pipe is communicated with an air cylinder of the large-cylinder-diameter gas engine;
the two paths of air inlet passages are communicated with the gas inlet and the air inlet pipe;
the two air inlet passages comprise a first air inlet passage and a second air inlet passage;
the first intake passage includes: the system comprises a mixer, a supercharger, an intercooler, a throttle valve and a controllable bypass valve; the mixer, the supercharger and the intercooler are sequentially connected with the throttle valve, one air inlet end of the mixer is communicated with the fuel gas inlet, the other air inlet end of the mixer is communicated with the air inlet, and the air outlet end of the throttle valve is connected with the air inlet pipe; the controllable bypass valve is arranged on a pipeline for communicating the air outlet end of the intercooler with the air inlet end of the supercharger;
the second intake passage includes: and the gas outlet faces to at least one gas injection valve of the gas inlet pipe.
Preferably, the gas injection valve is a vehicle gas injection valve.
Preferably, the air inlet pipe is provided with at least one path of air inlet manifold communicated with the cylinder;
the gas injection valve is arranged on the air inlet manifold, and the gas outlet of the gas injection valve is communicated with the air inlet manifold.
Preferably, the air inlet pipe is provided with a plurality of paths of air inlet manifolds which are respectively communicated with the plurality of cylinders, and each path of air inlet manifold is provided with one fuel gas injection valve.
Preferably, the second intake passage further includes: a pressure regulating valve disposed between the gas inlet and the gas inlet of the gas injection valve.
Preferably, the first intake passage further includes: the gas inlet end of the pressure regulating valve is connected with the gas inlet, the gas outlet end of the pressure regulating valve is connected with the gas inlet end of the zero pressure valve, and the gas outlet end of the zero pressure valve is connected with the mixer.
In still another aspect, the present application further provides an air intake control method for a large-cylinder-diameter gas engine, the method being based on the air intake system described above, the method including:
acquiring the rotating speed of the large-cylinder-diameter gas engine;
judging whether the change rate of the rotating speed is greater than or equal to a preset value or not;
and under the condition that the change rate of the rotating speed is larger than or equal to the preset value, closing the controllable bypass valve, controlling the opening of the throttle valve, and controlling the gas injection valve to inject gas into the cylinder.
Preferably, in the case where it is determined that the rate of change of the rotation speed is less than a preset value, the controllable bypass valve is opened, and the opening degree of the throttle valve is controlled.
Preferably, the controlling of the gas injection valve to inject the gas into the cylinder includes:
acquiring an excess air coefficient before the change rate of the rotating speed is greater than or equal to a preset value;
and determining the gas injection quantity according to the excess air coefficient and the change rate of the rotating speed, and controlling a gas injection valve to inject gas to the cylinder according to the gas injection quantity.
In still another aspect, the present application provides an intake control apparatus for a large-cylinder-diameter gas engine, which is applied to the intake system described above, the apparatus including:
the acquisition unit is used for acquiring the rotating speed of the large-cylinder-diameter gas engine;
the determining unit is used for judging whether the change rate of the rotating speed acquired by the acquiring unit is greater than or equal to a preset value;
and the first control unit is used for closing the controllable bypass valve, controlling the opening of the throttle valve and controlling the gas injection valve to inject gas into the cylinder under the condition that the determining unit determines that the change rate of the rotating speed is greater than or equal to a preset value.
It can be seen that, in the embodiment of the present application, the air intake system of the large-cylinder-diameter gas engine includes an air intake pipe communicated with the cylinder of the large-cylinder-diameter gas engine and two air intake passages communicating the gas inlet and the air intake pipe. An intake passage including a mixer, a supercharger, an intercooler, a throttle valve, and a controllable bypass valve supports an intake mode of premixed intake air before supercharging. Therefore, the pressure of the mixed gas at the throttle valve can be quickly increased by closing the controllable bypass valve for air inlet bypass without air inlet bypass, and the mixed gas can quickly enter the cylinder by matching with the control of the opening degree of the throttle valve. Further, the other intake passage including the gas injection valve supports the intake mode of port injection intake air. Because this gas injection valve sets up in the intake pipe, through control gas injection valve, can directly spray the gas to the cylinder in, make the gas mixture air-fuel ratio in the cylinder turn thick fast. Therefore, the air intake system of the large-cylinder-diameter gas engine in the embodiment of the application supports an air intake mode capable of simultaneously realizing rapid increase of air intake quantity in the cylinder and rapid change of the air-fuel ratio of the mixed gas, and effectively solves the technical problem of poor transient response performance of the large-cylinder-diameter gas engine.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the provided drawings without creative efforts.
FIG. 1 shows a schematic view of an air induction system of a large bore gas engine in an embodiment of the present application;
FIG. 2 shows a further schematic view of the air intake system of a large bore gas engine in an embodiment of the present application;
FIG. 3 is a schematic flow chart illustrating an intake control method for a large-bore gas engine according to an embodiment of the present application;
FIG. 4 is a schematic flow chart illustrating a further method for controlling intake of a large-bore gas engine according to an embodiment of the present disclosure;
fig. 5 shows a schematic composition diagram of an intake control device of a large-cylinder-diameter gas engine in the embodiment of the present application.
Detailed Description
The air inlet system, the air inlet control method and the air inlet control device of the large-cylinder-diameter gas engine are suitable for solving the problem that the transient response performance of the existing large-cylinder-diameter gas engine is poor.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For ease of understanding, the large bore gas engine will be described first.
The large-cylinder-diameter gas engine comprises an electronic control unit ECU, a cylinder and an air inlet system.
The electronic control unit ECU is the brain of the large-cylinder-diameter gas engine and is used for executing various control functions, such as controlling air intake of an air intake system.
The large-bore gas engine generally comprises a plurality of cylinders, and the common large-bore gas engines comprise 12 cylinders, 16 cylinders and 20 cylinders. The cylinder is communicated with an air inlet pipe of the air inlet system, and air enters the cylinder through the air inlet pipe.
In one possible implementation, a plurality of cylinders share a single intake pipe. Taking a 12-cylinder large-cylinder-diameter gas engine as an example, six cylinders share one air inlet pipe and are matched with an air inlet system comprising two air inlet pipes.
Currently, the structure of an intake system of a large-cylinder-diameter gas engine is shown in fig. 1, and the intake system 100 includes an intake pipe 105 communicating with a cylinder of the large-cylinder-diameter gas engine and an intake passage communicating a gas inlet and the intake pipe 105.
Wherein the intake passage includes: a mixer 101, a supercharger 102, an intercooler 103, and a throttle valve 104, which are connected in this order. Further comprising: and a bypass valve 106 provided in a pipe formed between an outlet end of the intercooler 103 and an inlet end of the supercharger 102. The air outlet end of the throttle valve 104 is connected to an air inlet pipe 105.
Based on this air intake system 100, the air intake process includes: the fuel gas and the air enter a mixer 101 to be mixed, then the mixed gas is pressurized by a supercharger 102 and cooled by an intercooler 103, and then a part of the mixed gas enters a cylinder through an air inlet pipe 105; and the other part of the mixed gas passes through the bypass valve and returns to the air inlet end of the supercharger. The intake air amount is adjusted only by the throttle valve 104, and the bypass valve 106 is not controllable and does not participate in adjustment of the intake air amount.
When the load of the large-cylinder-diameter gas engine is increased, in order to adapt to the load change, the air inflow entering the large-cylinder-diameter gas engine needs to be increased so as to improve the total energy of combustion work; it is also necessary to change the air-fuel ratio entering the large-bore gas engine to improve the combustion quality. The inventor of the application discovers that under the air intake system, on one hand, because the rotary inertia of the supercharger is large, the pressure of the air mixture in the air intake channel cannot be increased rapidly, so that the air mixture cannot enter the air cylinder rapidly, and the energy available for combustion work is insufficient, thereby causing the transient response performance to be poor. On the other hand, the mixed gas can enter the cylinder only through the mixer, the supercharger, the intercooler, the throttle valve and the air inlet pipe, the air inlet channel is long, the volume of the air inlet channel of the large-cylinder-diameter gas machine is very large compared with that of the small-cylinder-diameter gas machine, and the mixed gas after the air-fuel ratio is changed can enter the cylinder only after a period of time, so that the air-fuel ratio of the mixed gas is changed slowly, the gas cannot be combusted fully, and the transient response performance is poor.
In order to solve the technical problem of poor transient response performance of the existing large-cylinder-diameter gas engine, the inventor of the application researches and discovers that an air inlet passage which is used for introducing air through a gas injection valve can be additionally arranged on the basis of the air inlet system. The gas injection valve is arranged on the gas inlet pipe, and the gas can be directly injected into the cylinder by controlling the gas injection valve, so that the air-fuel ratio of the mixed gas in the cylinder is quickly changed to be rich, and the air-fuel ratio of the mixed gas in the cylinder is quickly changed. Meanwhile, the bypass valve in the air intake system is replaced by the controllable bypass valve, when the air intake amount is controlled, the control of the controllable bypass valve can be increased, the air intake bypass of the large-cylinder-diameter gas engine is avoided by closing the controllable bypass valve, the pressure of mixed gas at the throttle valve is quickly increased, and the mixed gas can quickly enter the cylinder by matching with the control of the throttle valve. Therefore, the air intake system of the large-cylinder-diameter gas engine in the embodiment of the application supports an air intake mode capable of simultaneously realizing the rapid change of the air-fuel ratio of the air-fuel mixture in the cylinder and the rapid increase of the air intake quantity, and effectively solves the technical problem of poor transient response performance of the large-cylinder-diameter gas engine.
The air intake system of the large-cylinder-diameter gas engine according to the embodiment of the present application will be described with reference to the accompanying drawings. For example, referring to fig. 2, a schematic structural diagram of an intake system of a large-cylinder-diameter gas engine according to an embodiment of the present application is shown, where the intake system 200 includes: an intake pipe 106; and a two-way intake passage communicating the gas inlet with the intake pipe 106.
Wherein the air inlet pipe 106 is communicated with the cylinder of the large-cylinder-diameter gas engine.
For the sake of convenience of distinction, these two intake passages are referred to as a first intake passage and a second intake passage, respectively.
Wherein the first path intake passage includes: mixer 101, supercharger 102, intercooler 103, throttle valve 104, and controllable bypass valve 108.
Wherein the mixer 101 comprises two inlet ports and one outlet port. The two gas inlet ends are respectively a gas inlet end and an air inlet end, and the gas inlet end is connected with a gas inlet and is communicated with the gas inlet and the first path of gas inlet passage; the air inlet end is connected with the air inlet. The mixer 101 is used to mix air and gas.
In one possible implementation, an air filter is also provided between the air inlet and the air intake of the mixer 101 for filtering the air entering from the air inlet.
The outlet end of the mixer 101 is connected with the inlet end of the supercharger 102, and the mixed gas obtained by mixing through the mixer 101 can flow into the supercharger.
The supercharger 102 is used to supercharge the mixture flowing from the mixer 101 into the supercharger 102. The air outlet end of the supercharger 102 is connected with the air inlet end of the intercooler 103, and the mixed air supercharged by the supercharger 102 can flow into the intercooler.
The intercooler 103 is used to cool the mixture flowing from the supercharger 102 into the intercooler. An air outlet end of the intercooler 103 is connected with an air inlet end of the throttle valve 104. The mixture cooled by the intercooler 103 may flow into the throttle valve 104.
The air outlet end of the throttle valve 104 is connected to an air inlet pipe 106, and is used for controlling the amount of air of the air-fuel mixture cooled by the intercooler flowing into the air inlet pipe 106.
The controllable bypass valve 108 is disposed on a pipeline communicating the air outlet end of the intercooler 103 and the air inlet end of the supercharger 102, and can return a part of the mixed air cooled by the intercooler to the supercharger 102 for realizing air inlet bypass. By closing the bypass valve and not performing air inlet bypass, all mixed air cooled by the intercooler can flow into the air inlet pipe, and the effect of increasing the air inlet amount is achieved.
In addition, the first intake passage further includes: air-vent valve and zero-pressure valve, air-vent valve and zero-pressure valve all set up on the pipeline of blender and gas inlet intercommunication, and the inlet end and the gas inlet of air-vent valve link to each other, and the end of giving vent to anger of air-vent valve links to each other with the inlet end of zero-pressure valve, and the end of giving vent to anger of zero-pressure valve links to each other with the blender. The gas from the gas inlet is firstly regulated by a pressure regulating valve, then the pressure is regulated to zero pressure by a zero pressure valve, and the zero pressure gas enters the mixer 101.
The second intake passage includes: at least one gas injection valve 107. At least one gas injection valve 107 is arranged on the gas inlet pipe 106, the gas inlet of each gas injection valve is communicated with the gas inlet, and the gas outlet faces the gas inlet pipe. The gas injection valve 107 is used to inject gas into the intake pipe.
The gas injection valve utilizes an electromagnetic principle, the coil is electrified to generate magnetic force to enable the valve to overcome the pretightening force of the spring to be opened, the coil is powered off, the valve is closed under the action of the spring, and the gas can be injected by a device which can enable the valve to be quickly opened and closed by controlling the on-off of a coil power supply. Only need spray a small amount of gas in this application embodiment, can adopt automobile-used gas injection valve. The fuel gas injection valve for the vehicle has reliable performance and low price, and is favorable for market popularization and application.
In a possible implementation, the air inlet pipe is provided with at least one path of air inlet manifold communicated with the cylinder, the gas injection valve is arranged on the air inlet manifold, and an air outlet of the gas injection valve is communicated with the air inlet manifold.
Wherein, a plurality of paths of air inlet manifolds which are respectively communicated with a plurality of cylinders can be arranged on one air inlet pipe, and each path of air inlet manifold is provided with a fuel gas injection valve. Still taking a 12-cylinder large-cylinder-diameter gas engine as an example, six intake manifolds are arranged on each intake pipe, and each intake manifold is provided with a gas injection valve. The control of the gas injection valve may inject gas into the cylinder corresponding to the gas injection valve.
The second intake passage further includes: a pressure regulating valve. The pressure regulating valve is arranged between the gas inlet and the gas inlet of the gas injection valve and used for regulating the pressure of gas entering the gas injection valve.
In addition to the above structure, the intake system 200 includes: gas trip valve. The gas shut-off valve is arranged at a gas inlet and used for shutting off fuel supply under the condition of safety risk or accident.
Under the air inlet system, the fuel gas is divided into two paths after passing through the fuel gas stop valve, the first path of fuel gas enters the mixer after being subjected to pressure regulation by the pressure regulating valve and the zero pressure valve and is mixed with the air entering the mixer through the air filter, the mixed gas enters the air cylinder through the supercharger, the intercooler, the throttle valve and the air inlet pipe, and part of the mixed gas at the throttle valve flows back to the air inlet end of the supercharger through the bypass valve. The first intake air amount can be controlled by controlling a throttle valve and a bypass valve. And the second path of fuel gas is subjected to pressure regulation by a pressure regulating valve, and then is injected into the air inlet pipe through the fuel gas injection valve corresponding to each cylinder to enter the cylinder. The second path air inlet quantity can be controlled by controlling the fuel gas injection valve.
When the large-bore gas engine has the above intake system, the cylinder can be ventilated only through one of the intake passages. For example, the air intake may be performed only through the first path, and the air intake process is the same as the air intake process in the air intake system of fig. 1, and is not described herein again. The air inlet can be carried out only through the second path, and the requirement of the large-cylinder-diameter gas engine can be met only by adopting a large-flow gas injection valve and injecting a large amount of gas into the cylinder in the air inlet mode.
However, considering that the gas is only fed through the first path, the transient response performance of the large-cylinder-diameter gas engine is poor, the gas is only fed through the second path, the price of the large-flow gas injection valve is very expensive, and the gas and the air are directly mixed in the cylinder, so that the problems of uneven mixing of the gas and the air exist, the gas consumption is high, and the reliability is poor. In the embodiment of the application, the mode of simultaneously carrying out air inlet through two paths is preferred, the fuel of the large-cylinder-diameter gas engine is mainly the mixed gas entering from the first path in the air inlet mode, and the air-fuel ratio of the mixed gas can be changed by only injecting a small amount of fuel gas. Therefore, the vehicle gas injection valve with reliable performance and low price can be adopted, and the cost is low. Meanwhile, in a two-way air inlet mode, the air-fuel ratio of the mixed gas is controllable, so that the fuel can be fully combusted, the gas consumption is low, and the reliability is high.
In other embodiments, the supercharger 102 in the intake system described above may be replaced with a plurality of small superchargers in cascade. The mixed gas is pressurized for many times through a plurality of small superchargers, and the effect of quickly improving the pressure of the mixed gas and enabling the mixed gas to quickly enter the cylinder can also be achieved.
In the embodiment of the application, the air inlet system of the large-cylinder-diameter gas engine comprises an air inlet pipe communicated with a cylinder of the large-cylinder-diameter gas engine and two air inlet passages communicated with a gas inlet and the air inlet pipe. An intake passage including a mixer, a supercharger, an intercooler, a throttle valve, and a controllable bypass valve supports an intake mode of premixed intake air before supercharging. Therefore, the pressure of the mixed gas at the throttle valve can be quickly increased by closing the controllable bypass valve for air inlet bypass without air inlet bypass, and the mixed gas can quickly enter the cylinder by matching with the control of the opening degree of the throttle valve. Further, the other intake passage including the gas injection valve supports the intake mode of port injection intake air. Because this gas injection valve sets up in the intake pipe, through control gas injection valve, can directly spray the gas to the cylinder in, make the gas mixture air-fuel ratio in the cylinder turn thick fast. Therefore, the air intake system of the large-cylinder-diameter gas engine in the embodiment of the application supports an air intake mode capable of simultaneously realizing rapid increase of air intake quantity in the cylinder and rapid change of the air-fuel ratio of the mixed gas, and effectively solves the technical problem of poor transient response performance of the large-cylinder-diameter gas engine.
The air intake system in this application embodiment adds the gas injection system on current air intake system's basis, need not carry out big change to former engine structure to can adopt automobile-used gas injection valve, the engine cost increases very little, is favorable to marketing.
Based on the air inlet system of the large-cylinder-diameter gas engine in the embodiment, the embodiment of the application provides an air inlet control method of the large-cylinder-diameter gas engine. For example, referring to fig. 3, which shows a schematic flowchart of an embodiment of the intake control method for a large-cylinder-diameter gas engine according to the present application, the method of the present embodiment is executed by an electronic control unit ECU of the large-cylinder-diameter gas engine, and the method may include:
s301, the rotating speed of the large-cylinder-diameter gas engine is obtained.
The rotating speed of the large-cylinder-diameter gas engine can be obtained by obtaining a rotating speed measured value of a rotating speed sensor arranged on the large-cylinder-diameter gas engine.
S302, judging whether the change rate of the rotating speed of the large-cylinder-diameter gas engine is larger than or equal to a preset value.
It will be appreciated that the rate of change of the speed of the engine is capable of reflecting changes in the load on the engine. In the embodiment of the application, whether the large-cylinder-diameter gas engine is in a transient working condition or a steady working condition with suddenly increased load is determined according to the rotating speed change rate of the large-cylinder-diameter gas engine. And under the condition that the change rate of the rotating speed of the large-cylinder-diameter gas engine is greater than or equal to a preset value, the large-cylinder-diameter gas engine is in a transient working condition that the load is suddenly increased, and under the condition that the change rate of the rotating speed of the large-cylinder-diameter gas engine is less than the preset value, the large-cylinder-diameter gas engine is in a steady-state working condition.
The preset value can be preset according to the type, application scene and the like of the large-cylinder-diameter gas engine. This is not to be taken in any way limiting by the present application.
And S303, under the condition that the change rate of the rotating speed of the large-cylinder-diameter gas engine is determined to be larger than or equal to a preset value, closing the controllable bypass valve, controlling the opening of the throttle valve, and controlling the gas injection valve to inject gas into the cylinder.
Wherein controlling the opening degree of the throttle valve includes: presetting a pressure value and a temperature value of an air inlet pipe; acquiring an opening value before the controllable bypass valve is closed; and controlling the opening degree of the throttle valve according to the rotating speed change rate, the opening degree value before the controllable bypass valve is closed, a preset air inlet pipe pressure value and an air inlet pipe temperature value.
It will be appreciated that because the bypass valve inlet bypass will cause a portion of the mixture at the throttle to bypass back to the supercharger inlet, this will relieve a portion of the pressure of the mixture at the throttle. And the bypass valve is quickly closed, so that the supercharged and cooled mixed gas cannot flow back, the opening of the throttle valve is increased, the pressure of the mixed gas can be quickly increased, and the mixed gas can quickly enter the air inlet channel.
When the opening of the throttle valve is controlled by closing the bypass valve to adjust the air inflow of the mixture, the excess air coefficient before the change rate of the rotating speed is larger than or equal to the preset value, namely the excess air coefficient before the load of the large-cylinder-diameter gas engine is rapidly increased, can be obtained, and the air-fuel ratio of the mixture is controlled according to the obtained excess air coefficient. The large-cylinder-diameter gas engine can burn the mixed gas fully entering the cylinder, the gas consumption is reduced, and the reliability and the economical efficiency of the engine are ensured.
At present, a waste gas bypass valve is also arranged on the large-cylinder-diameter gas engine, and in another embodiment, the pressure of mixed gas can be quickly increased by controlling the waste gas bypass valve, so that the aim of quickly increasing the air inflow is fulfilled.
Wherein, control gas injection valve includes: acquiring an excess air coefficient before the change rate of the rotating speed of the large-cylinder-diameter gas engine is larger than or equal to a preset value, namely the excess air coefficient before the load of the large-cylinder-diameter gas engine is rapidly increased, determining the gas injection quantity according to the acquired excess air coefficient and the change rate of the rotating speed, and controlling the gas injection valve to inject gas into the cylinder according to the gas injection quantity. In one possible implementation, the ECU determines a first injection amount correction coefficient in accordance with a rotation speed change rate; judging the air-fuel ratio condition of the current air-fuel mixture according to the excess air coefficient, and determining a second injection quantity correction coefficient according to the air-fuel ratio condition of the current air-fuel mixture; determining a target injection amount correction coefficient based on the first injection amount correction coefficient and the second injection amount correction coefficient; and correcting the injection quantity of the gas injection valve according to the target injection quantity correction coefficient.
It will be appreciated that the control of the gas injection valve allows gas to be injected directly into the cylinder, which mixes with the mixture entering the cylinder and the air-fuel ratio changes rapidly.
In the embodiment of the application, under the condition that the rotating speed change rate of the gas engine is larger than or equal to the preset value, namely when the gas engine operates under the transient working condition, the control of the bypass valve and the gas injection valve is increased on the basis of only controlling the throttle valve originally. The intake air amount of the mixture can be quickly increased by controlling the bypass valve and the throttle valve. The air-fuel ratio of the mixture can be changed quickly by controlling the gas injection valve. Thereby improving the transient response performance of the large-cylinder-diameter gas engine. In addition, in the embodiment of the application, the air-fuel ratio of the mixed gas is controlled, the engine is fully combusted, the gas consumption is low, and the reliability and the economy of the engine are ensured.
Referring to fig. 4, a schematic flow chart of yet another embodiment of the intake control method of the large cylinder gas engine of the present application is shown, the method comprising:
s401, the rotating speed of the large-cylinder-diameter gas engine is obtained.
S402, judging whether the change rate of the rotating speed of the large-cylinder-diameter gas engine is larger than or equal to a preset value.
And S403, closing the controllable bypass valve, controlling the opening of the throttle valve and controlling the gas injection valve to inject gas into the cylinder under the condition that the change rate of the rotating speed of the large-cylinder-diameter gas engine is determined to be greater than or equal to a preset value.
When the large-cylinder-diameter gas engine is in a transient working condition, the air inflow of the mixed gas is rapidly increased by closing the bypass valve and controlling the opening of the throttle valve; the transient response performance of the large-cylinder-diameter gas engine is improved by controlling the gas injection valve to rapidly change the air-fuel ratio of the mixed gas.
The steps S401 to S403 can refer to the related description above, and are not described herein again.
And S404, under the condition that the change rate of the rotating speed of the large-cylinder-diameter gas engine is smaller than the preset value, opening the controllable bypass valve and controlling the opening of the throttle valve.
Wherein opening the controllable bypass valve may be adjusting an opening value of the controllable bypass valve to be non-zero. The specific opening value is determined by the need for the intake bypass function.
Controlling the opening degree of the throttle valve includes: presetting a pressure value and a temperature value of an air inlet pipe; and controlling the opening of the throttle valve according to the rotating speed change rate, the preset air inlet pipe pressure value and the preset air inlet pipe temperature value.
The excess air coefficient before the change rate of the rotating speed is larger than or equal to a preset value can be obtained while the air inflow of the mixed gas is controlled through a throttle valve; that is, the excess air ratio before the load of the large-bore gas engine is rapidly increased, and the air-fuel ratio of the mixture is controlled according to the acquired excess air ratio. The large-cylinder-diameter gas engine can burn fuel which fully enters the cylinder, the gas consumption is reduced, and the reliability and the economical efficiency of the engine are ensured.
In the embodiment of the application, when the large-cylinder-diameter gas engine runs, the working condition of the large-cylinder-diameter gas engine is determined according to the rotating speed change rate of the large-cylinder-diameter gas engine, air is fed in according to the air inlet mode suitable under the working condition under different working conditions, when the engine works under the transient working condition that the load is suddenly increased, air is fed in through a pre-mixing air inlet mode before pressurization and an air inlet channel injection air inlet mode, and the transient response performance of the engine is guaranteed; when the engine works in a steady state working condition, air is fed in a premixing mode before pressurization, and the reliability and the economic performance are good. The scheme of the embodiment realizes the automatic switching of the air inlet mode, enables the engine to be in the most appropriate running state all the time, expands the application range of the large-cylinder-diameter gas engine, can be applied to pumps, compressors, drilling machines and the like, and can also be used as a mobile power supply or a power source.
The application also provides an air inlet control device of the large-cylinder-diameter gas engine.
For example, referring to fig. 5, it shows a schematic structural diagram of the composition of an embodiment of the intake control device for a large-cylinder-diameter gas engine according to the present application, which is applied to the electronic control unit ECU of the large-cylinder-diameter gas engine based on the intake system of the large-cylinder-diameter gas engine in the above embodiment. The apparatus may include:
an obtaining unit 501, configured to obtain a rotation speed of the large-cylinder-diameter gas engine;
a determining unit 502, configured to determine whether the change rate of the rotation speed of the large-cylinder-diameter gas engine obtained by the obtaining unit 501 is greater than or equal to a preset value;
and a first control unit 503, configured to close the bypass valve, control the opening of the throttle valve, and control the gas injection valve to inject gas into the cylinder when the determining unit 502 determines that the change rate of the rotation speed of the large-cylinder-diameter gas engine is greater than or equal to the preset value.
In a possible implementation, the apparatus further comprises a second control unit 504 for opening the controllable bypass valve and controlling the opening of the throttle valve in case the determination unit 502 determines that the rate of change of the rotational speed of the large-bore gas engine is smaller than a preset value.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. Air intake system of big cylinder diameter gas engine, its characterized in that includes:
the air inlet pipe is communicated with an air cylinder of the large-cylinder-diameter gas engine;
the two paths of air inlet passages are communicated with the gas inlet and the air inlet pipe;
the two air inlet passages comprise a first air inlet passage and a second air inlet passage;
the first intake passage includes: the system comprises a mixer, a supercharger, an intercooler, a throttle valve and a controllable bypass valve; the mixer, the supercharger and the intercooler are sequentially connected with the throttle valve, one air inlet end of the mixer is communicated with the fuel gas inlet, the other air inlet end of the mixer is communicated with the air inlet, and the air outlet end of the throttle valve is connected with the air inlet pipe; the controllable bypass valve is arranged on a pipeline for communicating the air outlet end of the intercooler with the air inlet end of the supercharger;
the second intake passage includes: and the gas outlet faces to at least one gas injection valve of the gas inlet pipe.
2. The air intake system of claim 1, wherein the gas injection valve is a vehicular gas injection valve.
3. The air intake system of claim 1, wherein the intake pipe is provided with at least one intake manifold communicating with the cylinders;
the gas injection valve is arranged on the air inlet manifold, and the gas outlet of the gas injection valve is communicated with the air inlet manifold.
4. An intake system according to claim 3, wherein a plurality of intake manifolds that communicate with a plurality of cylinders, respectively, are provided in the intake pipe, and one of the gas injection valves is provided in each of the intake manifolds.
5. The intake system of claim 1, wherein the second intake passage further comprises: a pressure regulating valve disposed between the gas inlet and the gas inlet of the gas injection valve.
6. The intake system of claim 1, wherein the first intake passage further comprises: the gas inlet end of the pressure regulating valve is connected with the gas inlet, the gas outlet end of the pressure regulating valve is connected with the gas inlet end of the zero pressure valve, and the gas outlet end of the zero pressure valve is connected with the mixer.
7. An intake control method for a large-bore gas engine having an intake system according to any one of claims 1 to 6, the method comprising:
acquiring the rotating speed of the large-cylinder-diameter gas engine;
judging whether the change rate of the rotating speed is greater than or equal to a preset value or not;
and under the condition that the change rate of the rotating speed is larger than or equal to the preset value, closing the controllable bypass valve, controlling the opening of the throttle valve, and controlling the gas injection valve to inject gas into the cylinder.
8. The intake control method according to claim 7, wherein in a case where it is determined that the rate of change in the rotational speed is less than a preset value, the controllable bypass valve is opened, and the opening degree of the throttle valve is controlled.
9. The intake control method according to claim 7, wherein the controlling of the gas injection valve to inject the gas into the cylinder includes:
acquiring an excess air coefficient before the change rate of the rotating speed is greater than or equal to a preset value;
and determining the gas injection quantity according to the excess air coefficient and the change rate of the rotating speed, and controlling a gas injection valve to inject gas to the cylinder according to the gas injection quantity.
10. An intake control apparatus for a large-bore gas engine having an intake system according to any one of claims 1 to 6, the apparatus comprising:
the acquisition unit is used for acquiring the rotating speed of the large-cylinder-diameter gas engine;
the determining unit is used for judging whether the change rate of the rotating speed acquired by the acquiring unit is greater than or equal to a preset value;
and the first control unit is used for closing the controllable bypass valve, controlling the opening of the throttle valve and controlling the gas injection valve to inject gas into the cylinder under the condition that the determining unit determines that the change rate of the rotating speed is greater than or equal to a preset value.
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| CN109958528A (en) * | 2019-04-08 | 2019-07-02 | 西安航天基地思普动力科技有限公司 | A kind of double pressurized cylinders of gas engine are interior to mix regulation device and its regulation method |
| CN110030121A (en) * | 2019-05-23 | 2019-07-19 | 重庆普什机械有限责任公司 | The powered controls of gas engine |
| CN110714836B (en) * | 2019-09-12 | 2020-11-20 | 潍柴动力股份有限公司 | Natural gas engine system and control method of natural gas engine system |
| CN111156096B (en) * | 2020-04-07 | 2020-08-21 | 潍柴动力股份有限公司 | Engine control method, ECU and engine |
| CN113107722B (en) * | 2021-04-20 | 2022-06-14 | 山东大学 | Gas inlet mechanism for improving quality of mixed gas formed by high-power gas machine and control method |
| CN113653569B (en) * | 2021-09-17 | 2023-04-14 | 潍柴动力股份有限公司 | Gas injection control method and device and vehicle |
| CN115306598A (en) * | 2022-08-12 | 2022-11-08 | 河南柴油机重工有限责任公司 | Device for uniformly feeding air to gas engine |
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