CN116255261A - Exhaust gas circulation injection control device and control method - Google Patents

Exhaust gas circulation injection control device and control method Download PDF

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Publication number
CN116255261A
CN116255261A CN202310345214.1A CN202310345214A CN116255261A CN 116255261 A CN116255261 A CN 116255261A CN 202310345214 A CN202310345214 A CN 202310345214A CN 116255261 A CN116255261 A CN 116255261A
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China
Prior art keywords
exhaust
exhaust gas
hydrogen
air
air inlet
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CN202310345214.1A
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Chinese (zh)
Inventor
谭丕强
王家俊
楼狄明
石秀勇
张允华
赵克秦
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Nanchang Intelligent New Energy Vehicle Research Institute
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Nanchang Intelligent New Energy Vehicle Research Institute
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Priority to CN202310345214.1A priority Critical patent/CN116255261A/en
Publication of CN116255261A publication Critical patent/CN116255261A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
    • 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
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • 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
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
    • 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
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0814—Oxygen storage amount

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention provides an exhaust gas circulation injection control device and a control method, wherein the device comprises a cylinder, an ignition device, an air inlet mechanism and an exhaust mechanism are arranged on the cylinder, the circulation mechanism is respectively connected with the air inlet mechanism and the exhaust mechanism, the sensing mechanism is arranged on the exhaust mechanism, and the ECU control mechanism is respectively and electrically connected with the ignition device, the air inlet mechanism, the circulation mechanism and the sensing mechanism. According to the invention, through detecting the nitrogen oxide concentration data, the oxygen concentration data and the temperature data on the exhaust mechanism, if the nitrogen oxide concentration data on the exhaust mechanism does not accord with the set threshold value, the ECU control mechanism controls the circulation mechanism, so that the discharged gas returns to the cylinder again through the circulation mechanism for combustion, the backfire phenomenon in the engine can be restrained, the ECU control mechanism controls the ignition device and the air inlet mechanism to adjust the hydrogen injection strategy, the thermal efficiency of the hydrogen engine is improved, and the emission of pollutants can be effectively reduced.

Description

Exhaust gas circulation injection control device and control method
Technical Field
The invention relates to the technical field of engine exhaust gas recirculation, in particular to an exhaust gas recirculation injection control device and an exhaust gas recirculation injection control method.
Background
Hydrogen has a high flame propagation rate over a wide range of temperatures and pressures, compared to other fuels, and has a high flame propagation rate even under lean conditions, with a reduced burn time. Meanwhile, the lean-burn capability of the hydrogen is stronger than that of other fuels, and the engine can stably work under lean mixture.
The present patent CN200610000803.2 discloses a control method and device for hydrogen-fuelled internal combustion engine, the invention relates to a control method and device for fuel supply of hydrogen engine intake pipe, the device is applicable to all internal combustion engines fuelled by hydrogen, the device includes a group of sensors for providing information reflecting hydrogen supply system and engine state. The device can realize that hydrogen is sprayed into the combustion chamber at the position closest to the air inlet valve seat of the engine, greatly reduces the possibility of backfire of the air inlet pipe, reduces the emission of NOx and controls pre-combustion. However, the device does not dynamically combine the EGR rate with the control strategy.
The prior patent CN200810183235.3 discloses a device for controlling the emission of a hydrogen internal combustion engine by hot exhaust gas recirculation, and the invention relates to a device for controlling the emission of a hydrogen internal combustion engine by hot exhaust gas recirculation. And receiving position sensor signals of a crankshaft, a camshaft and an accelerator in real time through an engine control unit, calculating the rotating speed, an ignition cylinder and the load, looking up a table to obtain an initial value of the concentration of the mixture, and correcting by utilizing feedback of an oxygen sensor to obtain the final concentration of the mixture. And determining whether to open the EGR valve according to the concentration of the mixed gas. But the device does not contemplate reducing emissions of nitrogen oxides.
The invention discloses a control method, a system, a processor and an electronic device for hydrogen injection of an engine, and discloses a control method, a system, a processor and an electronic device for hydrogen injection of an engine, wherein the control method for hydrogen injection of an engine comprises the following steps: the engine enters an operating mode when the vehicle is started, wherein the engine at least comprises the following components: an intake valve, a spark plug, a piston and a combustion chamber which are arranged in the cylinder; collecting working data of an engine in a working period, wherein the working data comprises: the opening time when the opening value of the intake valve is maximum, the closing time when the intake valve is closed, the ignition time of the spark plug, and the stroke time when the piston is compressed to a preset stroke; at least one control command is generated based on the operating data of the engine during the operating cycle, wherein the control command is used for controlling the injector to inject hydrogen with different duty ratios into the combustion chamber of the engine during corresponding control time. But the device does not contemplate setting the feedback adjustment by combustion characteristics.
In summary, in the prior art, the EGR rate and the control strategy cannot be dynamically combined and controlled in the exhaust emission process of the hydrogen engine, and the reduction of the emission of nitrogen oxides and the feedback adjustment by the combustion characteristics are not considered.
Disclosure of Invention
Accordingly, it is an object of the present invention to provide an exhaust gas recirculation injection control device and control method, which at least solve the above-mentioned drawbacks of the prior art.
The invention provides an exhaust gas circulation injection control device and a control method, comprising the following steps:
the ignition device is arranged on the cylinder;
the air inlet mechanism and the air exhaust mechanism are connected to the air cylinder;
the circulating mechanism is respectively connected with the air inlet mechanism and the air exhaust mechanism;
the sensing mechanism is arranged on the exhaust mechanism;
the ECU control mechanism is respectively and electrically connected with the ignition device, the air inlet mechanism, the circulating mechanism and the sensing mechanism;
the sensing mechanism is used for collecting data on the exhaust mechanism, the data comprise nitrogen oxide concentration data, oxygen concentration data and temperature data, the ECU control mechanism is used for detecting the data and controlling the ignition device, the air inlet mechanism and the circulating mechanism based on the detected data, so that the ignition device, the air inlet mechanism and the circulating mechanism mutually cooperate to adjust a hydrogen injection strategy, the hydrogen injection strategy is that exhaust gas in the exhaust mechanism is redirected back into the air inlet mechanism through the circulating mechanism, the exhaust gas is enabled to reenter the cylinder, and meanwhile the ignition device is controlled by the ECU control mechanism to adjust ignition time in the cylinder.
Compared with the prior art, the invention has the beneficial effects that: the ECU control mechanism detects the nitrogen oxide concentration data, the oxygen concentration data and the temperature data on the exhaust mechanism, which are acquired by the sensing mechanism, if the nitrogen oxide concentration data on the exhaust mechanism does not accord with the set threshold value, the ECU control mechanism controls the circulating mechanism at the moment, so that the discharged gas returns to the cylinder again through the circulating mechanism for combustion, the backfire phenomenon in the engine can be effectively restrained, the ECU control mechanism controls the ignition device and the air inlet mechanism to adjust the hydrogen injection strategy, the thermal efficiency of the hydrogen engine is improved, and the emission of pollutants can be effectively reduced.
Further, the air inlet mechanism comprises air storage equipment, an air guide pipeline, a hydrogen nozzle, an air inlet pipe and a first air valve, wherein the input end of the hydrogen nozzle is connected with the air storage equipment through the air guide pipeline, the other end of the hydrogen nozzle is arranged on the air inlet pipe, and one end of the air inlet pipe is connected with the air cylinder through the first air valve.
Further, one end of the air inlet pipe, which is far away from the first air valve, is connected with an air inlet supercharging system through an intercooler.
Further, the gas storage device is electrically connected with the ECU control mechanism through a circuit.
Further, the exhaust mechanism comprises an exhaust pipe and a second valve, and the input end of the exhaust pipe is connected to the cylinder through the second valve.
Further, the circulation mechanism comprises a circulation air pipe, an EGR and an electromagnetic valve, two ends of the circulation air pipe are respectively connected to the air inlet mechanism and the exhaust mechanism, the EGR and the electromagnetic valve are both arranged on the circulation air pipe, and the electromagnetic valve is electrically connected with the ECU control mechanism through a circuit.
Further, the sensing mechanism comprises a nitrogen oxide sensor, an oxygen sensor and an exhaust temperature sensor, wherein the nitrogen oxide sensor, the oxygen sensor and the exhaust temperature sensor are sequentially arranged in the exhaust mechanism along the exhaust direction.
Further, the ECU control means is electrically connected to the nitrogen oxide sensor, the oxygen sensor, and the exhaust gas temperature sensor through circuits, respectively.
Further, the ECU control mechanism is connected with a crank angle sensor through a circuit.
The invention also provides an exhaust gas circulation injection control method which is applied to the exhaust gas circulation injection control device, and the method comprises the following steps:
detecting nitrogen oxide concentration data, oxygen concentration data and temperature data on the exhaust mechanism through an ECU control mechanism to obtain detected data;
establishing a characterization function of emission pollution degree and a characterization function of engine combustion efficiency based on the detected data, simultaneously establishing a function of combustion and emission characteristics based on the characterization function of emission pollution degree and the characterization function of engine combustion efficiency, and setting a threshold value of emission pollution degree;
detecting the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure in a hydrogen nozzle through the ECU control mechanism, constructing a hydrogen injection strategy characterization function based on the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure, and setting an EGR rate characterization function;
constructing a characteristic relation function of the engine based on a function of combustion and emission characteristics, a hydrogen injection strategy characterization function and a characterization function of the EGR rate;
and judging the magnitude of the threshold value of the emission pollutant concentration and the emission pollutant degree, and if the emission pollutant concentration exceeds the threshold value of the emission pollutant degree, adjusting the hydrogen injection control strategy through the characteristic relation function of the engine.
Drawings
Fig. 1 is a schematic configuration diagram of an exhaust gas recirculation injection control device in a first embodiment of the present invention;
FIG. 2 is a control flow chart of the hydrogen injection strategy adjustment in the first embodiment of the present invention;
fig. 3 is a flowchart of an exhaust gas recirculation injection control method in a second embodiment of the invention.
Description of main reference numerals:
10. a cylinder; 11. an ignition device;
20. an air inlet mechanism; 21. a gas storage device; 22. an air guide pipe; 23. a hydrogen gas nozzle; 24. an air inlet pipe; 25. a first valve; 26. an intercooler; 27. an intake boost system;
30. an exhaust mechanism; 31. an exhaust pipe; 32. a second valve;
40. a circulation mechanism; 41. a circulation gas pipe; 42. EGR; 43. an electromagnetic valve;
50. a sensing mechanism; 51. a nitrogen oxide sensor; 52. an oxygen sensor; 53. an exhaust gas temperature sensor; 54. a crank angle sensor;
60. and an ECU control mechanism.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, an exhaust gas recirculation injection control apparatus according to a first embodiment of the present invention includes a cylinder 10, an intake mechanism 20, an exhaust mechanism 30, a recirculation mechanism 40, a sensing mechanism 50, and an ECU control mechanism 60.
The ignition device 11 is arranged on the cylinder 10, the air inlet mechanism 20 and the air outlet mechanism 30 are connected to the cylinder 10, the circulation mechanism 40 is respectively connected with the air inlet mechanism 20 and the air outlet mechanism 30, the sensing mechanism 50 is arranged on the air outlet mechanism 30, the ECU control mechanism 50 is respectively electrically connected with the ignition device 11, the air inlet mechanism 20, the circulation mechanism 40 and the sensing mechanism 50, wherein the sensing mechanism 50 is used for collecting data on the air outlet mechanism 30, the data comprise nitrogen oxide concentration data, oxygen concentration data and temperature data, the ECU control mechanism 60 is used for detecting the data, the ECU control mechanism 60 is also used for controlling the ignition device 11, the air inlet mechanism 20 and the circulation mechanism 40 based on the detected data, so that the ignition device 11, the air inlet mechanism 20 and the circulation mechanism 40 are mutually matched and adjust a hydrogen injection strategy, and the hydrogen injection strategy is that the exhaust gas in the air outlet mechanism 30 is redirected into the ignition device 20 through the circulation mechanism 40, the exhaust gas is re-entering the air inlet mechanism 10, and the ignition device 11 is controlled by the ignition device 11, and the ignition device 11 is controlled by the air inlet mechanism 60 at the same time.
It will be appreciated that the air intake mechanism 20The hydrogen is led into the cylinder 10 and is ignited by the ignition device 11 on the cylinder 10, so that the hydrogen in the cylinder 10 is ignited to push the cylinder 10 to work, the cylinder 10 generates power, the ignited hydrogen generates gas, the gas is discharged through the exhaust mechanism 30, at the moment, the sensing mechanism 50 on the exhaust mechanism 30 collects the nitrogen oxide concentration data, the oxygen concentration data and the temperature data in the discharged gas of the exhaust mechanism 30, and the ECU control mechanism 60 is electrically connected with the sensing mechanism 50, so that the ECU control mechanism 60 can detect the concentration of nitrogen oxide, the oxygen concentration and the temperature on the exhaust mechanism 30, and in specific implementation, the characteristic function of the pollution degree of the emission is F (a), the characteristic function of the combustion efficiency of the engine is g (n, T), wherein n is the oxygen concentration, T is the discharge temperature, and the function F of the pollution degree of the emission pollution degree and the combustion efficiency is established 1 (F, g), and sets an exhaust pollutant concentration threshold value m, in this embodiment, the ECU control means 60 makes the hydrogen injection control strategy characterization function F by detecting the flow rate of hydrogen, the hydrogen injection timing, the hydrogen injection pressure in the intake means 20 2 (q, t, p), wherein q is hydrogen flow, t is hydrogen injection time, p is hydrogen injection pressure, and the characterization function of EGR rate is set to be F 3 (eta), followed by the procedure of G (F) 1 ，F 2 ，F 3 ) Is the characteristic relation of the engine, wherein F 1 Representing the function of emission pollution level and combustion efficiency, F 2 The table hydrogen injection control strategy characterization function, F3 represents the characterization function of EGR rate, then determines if the emission pollutant concentration exceeds a threshold value m, if F (a)>m, call G (F 1 ，F 2 ，F 3 ) Function, if f (a)<m, call G (G, F) 2 ，F 3 ) And if the concentration of the discharged pollutants does not exceed the threshold value m, judging whether the discharged pollutants exceed the threshold value for one time after the hydrogen injection strategy is regulated by the function, and obtaining the optimal control injection strategy of the hydrogen after the operation is finished, as shown in fig. 2. Through the implementation process, the backfire phenomenon in the hydrogen engine is restrained by controlling the hydrogen injection strategy and the EGR rate through the function, the thermal efficiency of the hydrogen engine is effectively improved, and the pollutant emission is reduced.
Referring to fig. 1, in this embodiment, the air intake mechanism 20 includes an air storage device 21, an air guide pipe 22, a hydrogen nozzle 23, an air intake pipe 24 and a first valve 25, wherein an input end of the hydrogen nozzle 23 is connected to the air storage device 21 through the air guide pipe 22, the other end of the hydrogen nozzle 23 is disposed on the air intake pipe 24, one end of the air intake pipe 24 is connected to the air cylinder 10 through the first valve 25, one end of the air intake pipe 24 far away from the first valve 25 is connected to an air intake pressurization system 27 through an intercooler 26, and the air storage device 21 is electrically connected to the ECU control mechanism 60 through a circuit.
It will be appreciated that a large amount of hydrogen is stored in the gas storage device 21, the hydrogen in the gas storage device 21 reaches the hydrogen nozzle 23 through the gas guide pipeline 22, then the hydrogen nozzle 23 ejects the hydrogen and enters the cylinder 10 through the gas inlet pipe 24 and the first valve 25, the ignition device 11 in the cylinder 10 is ignited at this time, so that the hydrogen combusts in the cylinder 10, and the hydrogen drives air to enter the cylinder 10 through the gas inlet pressurization system 27 and the intercooler 26 in the process of entering the cylinder 10, so that the hydrogen combusts with the air in the cylinder 10. It should be noted that, the gas storage device 21 is electrically connected with the ECU control mechanism 60, so that the ECU control mechanism 60 can control the amount of the hydrogen discharged by the gas storage device 21, and further can effectively adjust the hydrogen injection strategy.
Referring to fig. 1, in the present embodiment, the exhaust mechanism 30 includes an exhaust pipe 31 and a second valve 32, and an input end of the exhaust pipe 31 is connected to the cylinder 10 through the second valve 32. The circulation mechanism 40 includes a circulation air pipe 41, an EGR42, and an electromagnetic valve 43, two ends of the circulation air pipe 41 are respectively connected to the intake mechanism 20 and the exhaust mechanism 30, the EGR42 and the electromagnetic valve 43 are both disposed on the circulation air pipe 41, and the electromagnetic valve 43 is electrically connected to the ECU control mechanism 60 through a circuit.
It should be explained that, when the hydrogen injection strategy is adjusted so that the exhaust pollutant concentration is less than the threshold value m, the gas with higher pollutant concentration passes through the solenoid valve 43 and then passes through the circulating gas pipe 41 and the EGR42 to return to the intake pipe 24 and then returns to the cylinder 10 for combustion, thereby effectively improving the thermal efficiency of the hydrogen engine and reducing the pollutant emission.
Referring to fig. 1, in the present embodiment, the sensing mechanism 50 includes a nitrogen oxide sensor 51, an oxygen sensor 52, and an exhaust gas temperature sensor 53, the nitrogen oxide sensor 51, the oxygen sensor 52, and the exhaust gas temperature sensor 53 are sequentially disposed in the exhaust mechanism 20 along the exhaust direction, and the ECU control mechanism 60 is electrically connected to the nitrogen oxide sensor 51, the oxygen sensor 52, and the exhaust gas temperature sensor 53 through circuits, respectively.
It should be noted that the nitrogen oxide sensor 51, the oxygen sensor 52, and the exhaust gas temperature sensor 53 are sequentially disposed in the exhaust pipe 31, so that the nitrogen oxide sensor 51, the oxygen sensor 52, and the exhaust gas temperature sensor 53 can collect nitrogen oxide data, oxygen data, and exhaust gas temperature data in the exhaust gas on the exhaust pipe 31, and then the nitrogen oxide sensor 51, the oxygen sensor 52, and the exhaust gas temperature sensor 53 transmit the collected data to the ECU control mechanism 60, respectively, so that the ECU control mechanism 60 can detect nitrogen oxide data, oxygen data, and exhaust gas temperature data in the exhaust gas.
Further, the ECU control mechanism 60 is electrically connected to the crank angle sensor 54. A crank angle sensor 54 is mounted on a flywheel housing of the engine.
In summary, in the exhaust gas recirculation injection control device according to the first embodiment of the present invention, the ECU control mechanism 60 detects the nox concentration data, the oxygen concentration data and the temperature data on the exhaust mechanism 30 collected by the sensing mechanism 50, and if the nox concentration data on the exhaust mechanism 30 does not meet the set threshold, the ECU control mechanism 60 controls the recirculation mechanism 40 to enable the exhausted gas to return to the cylinder for combustion through the recirculation mechanism 40, so as to effectively inhibit the backfire phenomenon in the engine, and the ECU control mechanism 60 controls the ignition device 11 and the air intake mechanism to adjust the hydrogen injection strategy, thereby improving the thermal efficiency of the hydrogen engine and effectively reducing the emission of pollutants.
Example two
Referring to fig. 3, a second embodiment of the present invention provides an exhaust gas recirculation injection control method applied to the exhaust gas recirculation injection control device in the first embodiment, the method includes steps S101 to S105:
s101, detecting nitrogen oxide concentration data, oxygen concentration data and temperature data on the exhaust mechanism 20 through the ECU control mechanism 60 to obtain detected data;
s102, establishing a characterization function of emission pollution degree and a characterization function of engine combustion efficiency based on the detected data, simultaneously establishing a function of combustion and emission characteristics based on the characterization function of emission pollution degree and the characterization function of engine combustion efficiency, and setting a threshold value of emission pollution degree;
in particular embodiments, the emission pollution level is characterized by a function F (a), the engine combustion efficiency is characterized by a function g (n, T), where n is the oxygen concentration, T is the emission temperature, and a function F of emission pollution level and combustion efficiency is established 1 (f, g) an emission pollutant concentration threshold m.
S103, detecting the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure in a hydrogen nozzle through the ECU control mechanism 60, constructing a hydrogen injection strategy characterization function based on the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure, and setting an EGR rate characterization function;
in specific implementation, the characterization function of the hydrogen injection control strategy is F 2 (q, t, p), wherein q is hydrogen flow, t is hydrogen injection time, p is hydrogen injection pressure, and the characterization function of EGR rate is set to be F 3 (η)。
S104, constructing a characteristic relation function of the engine based on a function of combustion and emission characteristics, a hydrogen injection strategy characterization function and the EGR rate characterization function;
in particular, the characteristic relation function of the engine is G (F 1 ，F 2 ，F 3 ) Wherein F is 1 Representing the function of emission pollution level and combustion efficiency, F 2 Table hydrogen injection control strategy characterization function, F3 represents a table of EGR ratesAnd (5) a sign function.
S105, judging the magnitude of the emission pollutant concentration and the threshold value of the emission pollutant degree, and if the emission pollutant concentration exceeds the threshold value of the emission pollutant degree, adjusting the hydrogen injection control strategy through the characteristic relation function of the engine.
In practice, it is determined whether the concentration of the exhaust pollutant exceeds a threshold value m, if f (a)>m, call G (F 1 ，F 2 ，F 3 ) Function, if f (a)<m, call G (G, F) 2 ，F 3 ) And if the concentration of the discharged pollutants does not exceed the threshold value m, judging whether the discharged pollutants exceed the threshold value for one time after the hydrogen injection strategy is regulated by the function, and ending. Through the implementation process, the backfire phenomenon in the hydrogen engine is restrained by controlling the hydrogen injection strategy and the EGR rate through the function, the thermal efficiency of the hydrogen engine is effectively improved, and the pollutant emission is reduced.
In summary, the exhaust gas circulation injection control method in the second embodiment of the present invention couples the hydrogen injection strategy with the EGR control, has a more optimized solution to the problems of backfire, excessive emission of nitrogen oxides, etc. of the hydrogen engine, and has less system influence on the hydrogen engine itself, and the control method has controllability, so that the combustion characteristics and emission characteristics of the hydrogen engine can be obviously improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. An exhaust gas recirculation injection control apparatus, characterized by comprising:
the ignition device is arranged on the cylinder;
the air inlet mechanism and the air exhaust mechanism are connected to the air cylinder;
the circulating mechanism is respectively connected with the air inlet mechanism and the air exhaust mechanism;
the sensing mechanism is arranged on the exhaust mechanism;
the ECU control mechanism is respectively and electrically connected with the ignition device, the air inlet mechanism, the circulating mechanism and the sensing mechanism;
the sensing mechanism is used for collecting data on the exhaust mechanism, the data comprise nitrogen oxide concentration data, oxygen concentration data and temperature data, the ECU control mechanism is used for detecting the data and controlling the ignition device, the air inlet mechanism and the circulating mechanism based on the detected data, so that the ignition device, the air inlet mechanism and the circulating mechanism mutually cooperate to adjust a hydrogen injection strategy, the hydrogen injection strategy is that exhaust gas in the exhaust mechanism is redirected back into the air inlet mechanism through the circulating mechanism, the exhaust gas is enabled to reenter the cylinder, and meanwhile the ignition device is controlled by the ECU control mechanism to adjust ignition time in the cylinder.
2. The exhaust gas circulation injection control device according to claim 1, wherein the air intake mechanism comprises an air storage device, an air guide pipeline, a hydrogen nozzle, an air inlet pipe and a first air valve, the input end of the hydrogen nozzle is connected with the air storage device through the air guide pipeline, the other end of the hydrogen nozzle is arranged on the air inlet pipe, and one end of the air inlet pipe is connected with the air cylinder through the first air valve.
3. The exhaust gas recirculation injection control apparatus according to claim 2, wherein an end of the intake pipe remote from the first valve is connected to an intake supercharging system through an intercooler.
4. The exhaust gas recirculation injection control apparatus according to claim 2, wherein the gas storage device is electrically connected to the ECU control mechanism through an electric circuit.
5. The exhaust gas recirculation injection control apparatus according to claim 1, wherein the exhaust mechanism includes an exhaust pipe and a second valve, and an input end of the exhaust pipe is connected to the cylinder through the second valve.
6. The exhaust gas recirculation injection control device according to claim 1, wherein the recirculation mechanism includes a recirculation pipe, an EGR, and an electromagnetic valve, both ends of the recirculation pipe are connected to the intake mechanism and the exhaust mechanism, respectively, the EGR and the electromagnetic valve are both provided on the recirculation pipe, and the electromagnetic valve is electrically connected to the ECU control mechanism through a circuit.
7. The exhaust gas recirculation injection control apparatus according to claim 1, wherein the sensing mechanism includes a nitrogen oxide sensor, an oxygen sensor, and an exhaust gas temperature sensor, the nitrogen oxide sensor, the oxygen sensor, and the exhaust gas temperature sensor being sequentially arranged in the exhaust mechanism in an exhaust gas direction.
8. The exhaust gas recirculation injection control device according to claim 7, wherein the ECU control means is electrically connected to the nitrogen oxide sensor, the oxygen sensor, and the exhaust gas temperature sensor, respectively, through an electric circuit.
9. The exhaust gas recirculation injection control apparatus according to claim 1, wherein the ECU control mechanism is electrically connected to a crank angle sensor.
10. An exhaust gas recirculation injection control method applied to the exhaust gas recirculation injection control apparatus according to any one of claims 1 to 9, characterized by comprising:
detecting nitrogen oxide concentration data, oxygen concentration data and temperature data on the exhaust mechanism through the ECU control mechanism to obtain detected data;
establishing a characterization function of emission pollution degree and a characterization function of engine combustion efficiency based on the detected data, simultaneously establishing a function of combustion and emission characteristics based on the characterization function of emission pollution degree and the characterization function of engine combustion efficiency, and setting a threshold value of emission pollution degree;
detecting the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure in a hydrogen nozzle through the ECU control mechanism, constructing a hydrogen injection strategy characterization function based on the hydrogen injection quantity, the hydrogen injection time and the hydrogen injection pressure, and setting an EGR rate characterization function;
constructing a characteristic relation function of the engine based on a function of combustion and emission characteristics, a hydrogen injection strategy characterization function and a characterization function of the EGR rate;
and judging the magnitude of the threshold value of the emission pollutant concentration and the emission pollutant degree, and if the emission pollutant concentration exceeds the threshold value of the emission pollutant degree, adjusting the hydrogen injection control strategy through the characteristic relation function of the engine.
CN202310345214.1A 2023-04-03 2023-04-03 Exhaust gas circulation injection control device and control method Pending CN116255261A (en)

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