CN115075966A - Control method of high EGR (exhaust gas Recirculation) rate exhaust gas Recirculation System and power system - Google Patents
Control method of high EGR (exhaust gas Recirculation) rate exhaust gas Recirculation System and power system Download PDFInfo
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- CN115075966A CN115075966A CN202210690091.0A CN202210690091A CN115075966A CN 115075966 A CN115075966 A CN 115075966A CN 202210690091 A CN202210690091 A CN 202210690091A CN 115075966 A CN115075966 A CN 115075966A
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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
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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
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a control method of an exhaust gas recirculation system with a high EGR rate and a power system. Wherein, the method comprises the following steps: the method comprises the steps of collecting working condition information of the engine, wherein the working condition information comprises at least one of the following conditions: the engine is in a working state and the engine is in a stop state. A control instruction set is generated based on the operating condition information. Controlling opening and closing of a pre-vortex exhaust gas passageway and a post-vortex exhaust gas passageway based on a control instruction set, wherein an inlet end of the pre-vortex exhaust gas passageway is located between an outlet end of the engine and an inlet end of the turbine, and the inlet end of the post-vortex exhaust gas passageway is located downstream of the outlet end of the turbine. The invention solves the technical problems that the waste gas circulation efficiency can not be fully utilized and the waste gas emission is deteriorated because the pressure difference is small and enough waste gas can not enter the air inlet pipeline.
Description
Technical Field
The invention relates to the field of exhaust gas recirculation system control, in particular to a control method and a power system of an exhaust gas recirculation system with a high EGR rate.
Background
With increasingly strict fuel consumption and emission regulations, improving engine combustion efficiency and fuel economy becomes an important technology for automobile development. The EGR system can obviously improve fuel economy and reduce emission, and can reduce knocking and improve combustion efficiency. The EGR technology can be classified into external EGR and internal EGR technologies according to the path of the cycle, and the external EGR technology is further classified into high pressure EGR and low pressure EGR technologies. The low-pressure exhaust gas recirculation system drives exhaust gas to enter the air inlet pipe by utilizing the pressure difference between the exhaust gas recovery pipeline and the air inlet pipe, enough exhaust gas cannot enter the air inlet pipeline due to the fact that the pressure difference is small, the exhaust gas circulation efficiency cannot be fully utilized, and exhaust emission is deteriorated.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a control method and a power system of an exhaust gas recirculation system with a high EGR rate, which at least solve the technical problems that the exhaust gas circulation efficiency cannot be fully utilized and the exhaust gas emission is deteriorated because the pressure difference is small and enough exhaust gas cannot enter an air inlet pipeline.
According to an aspect of an embodiment of the present invention, there is provided a control method of a high EGR rate exhaust gas recirculation system, including: the method comprises the steps of collecting working condition information of the engine, wherein the working condition information comprises at least one of the following conditions: the engine is in a working state and is in a stop state; generating a control instruction set based on the working condition information; controlling opening and closing of a pre-vortex exhaust gas passageway and a post-vortex exhaust gas passageway based on a control instruction set, wherein an inlet end of the pre-vortex exhaust gas passageway is located between an outlet end of the engine and an inlet end of the turbine, and the inlet end of the post-vortex exhaust gas passageway is located downstream of the outlet end of the turbine.
Optionally, the operating condition information generates a control instruction set, and the control instruction set controls the opening and closing of the exhaust gas passageway before the vortex and the exhaust gas passageway after the vortex, including: and under the condition that the engine is determined to be in the working state, generating a first control instruction in a control instruction set, wherein the first control instruction is used for controlling the opening of the exhaust gas taking passage before the vortex and the closing of the exhaust gas taking passage after the vortex, and controlling the two-stage double turbines on the exhaust gas taking passage before the vortex and the exhaust gas taking passage after the vortex to be in the shutdown state.
Optionally, the method comprises: acquiring temperature information between the outlet end of a waste gas channel before vortex taking and the inlet end of a gas compressor; and judging whether the temperature information meets a first preset condition or not. And under the condition that the temperature information is determined to meet the first preset condition, generating a second control instruction in the control instruction set, wherein the second control instruction is used for controlling the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in an open state, and controlling the two-stage double turbines on the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in a shutdown state.
Optionally, determining whether the temperature information satisfies a first preset condition, and generating a second control instruction in the control instruction set when it is determined that the temperature information satisfies the first preset condition, including: judging whether the temperature information is larger than a minimum preset temperature value and lower than a combustion temperature limit value; if so, a second control instruction in the control instruction set is generated.
Alternatively, the intake pressure is acquired in a case where it is determined that the temperature information does not satisfy the first preset condition. And judging whether the intake pressure meets a second preset condition. And under the condition that the air inlet pressure meets a second preset condition, generating a third control instruction in the control instruction set, wherein the third control instruction is used for controlling the closing of the vortex front exhaust gas taking passage and the opening of the vortex rear exhaust gas taking passage, and controlling the two-stage double turbines on the vortex front exhaust gas taking passage and the vortex rear exhaust gas taking passage to be in a shutdown state.
Optionally, in a case that it is determined that the intake pressure does not satisfy the second preset condition, a fourth control instruction in the control instruction set is generated, where the fourth control instruction is used to control both the pre-vortex exhaust gas taking passage and the post-vortex exhaust gas taking passage to be opened, and control both the two-stage dual turbines on the pre-vortex exhaust gas taking passage and the post-vortex exhaust gas taking passage to be in an operating state.
Optionally, determining whether the intake pressure meets a second preset condition, and generating a third control instruction in the control instruction set if it is determined that the intake pressure meets the second preset condition, where the generating includes: it is determined whether the intake pressure is less than a pressure value at the inlet end of the post-vortex exhaust gas passageway downstream of the turbine outlet end. If so, a third control instruction in the set of control instructions is generated.
According to another aspect of the embodiments of the present invention, there is also provided a power system, including: the acquisition unit is used for acquiring the working condition information of the engine, wherein the working condition information comprises at least one of the following: the engine is in a working state and is in a stop state; the generating unit is used for generating a control instruction set based on the working condition information; and the control unit is used for controlling the opening and closing of a pre-vortex exhaust gas passage and a post-vortex exhaust gas passage based on a control instruction set, wherein the inlet end of the pre-vortex exhaust gas passage is positioned between the outlet end of the engine and the inlet end of the turbine, and the inlet end of the post-vortex exhaust gas passage is positioned at the downstream of the outlet end of the turbine.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, including: a stored program, wherein the program when executed controls an apparatus in which a computer readable storage medium stores instructions for executing the control method of the high EGR rate exhaust gas recirculation system according to the embodiment of the present invention.
According to another aspect of the embodiment of the invention, the processor is characterized by running the program, wherein the program is run to execute the control method of the high EGR rate exhaust gas recirculation system according to the embodiment of the invention.
In the embodiment of the invention, a mode of adding a circulating branch for taking exhaust gas from the front of a turbine of a turbocharger on the basis of a low-pressure EGR system and arranging double turbines in two pipelines is adopted, and the purposes that the two pipelines can be operated independently and can be opened simultaneously are achieved through different matching operation strategies of the two exhaust gas circulating branches, so that the technical effects of improving the EGR rate of an engine and reducing exhaust gas emission are realized under the condition of ensuring driving air pressure and air inlet temperature, and the technical problems that the exhaust gas circulating efficiency cannot be fully utilized and the exhaust gas emission can be deteriorated because enough exhaust gas cannot enter the air inlet pipeline due to small pressure difference are effectively solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a control method for a high EGR rate EGR system, a hardware configuration of a computer terminal of a power system, according to an embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of an alternative control method, powertrain system for a high EGR rate exhaust gas recirculation system, in accordance with an embodiment of the present invention;
FIG. 3 illustrates a schematic diagram of an alternative control method, powertrain system for a high EGR rate exhaust gas recirculation system, in accordance with an embodiment of the present invention;
FIG. 4 illustrates a schematic configuration diagram of an alternative high EGR rate EGR system control method, powertrain, in accordance with an embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of an alternative control method, powertrain system for a high EGR rate exhaust gas recirculation system, in accordance with an embodiment of the present invention;
the reference numbers illustrate:
1. an engine cylinder; 2. an air intake intercooler; 3. a compressor; 4. a turbine; 5. an air cleaner; 6. an EGR cooler; 7. an EGR cooler; 8. a turbine; 9. a turbine; 10. an EGR rate regulating valve; 11. an EGR rate regulating valve; 12. a pressure sensor; 13. a pressure sensor; 14. a pressure sensor; 15. an EGR flow control valve; 16. an EGR flow control valve; 17. an EGR switch valve; 18. an EGR switch valve; 19. a temperature sensor; 20. a temperature sensor; 21. a temperature sensor; 22. an EGR switch valve; 23. and an EGR switch valve.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for control of a high EGR rate exhaust gas recirculation system, wherein the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer executable instructions, and wherein, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The method embodiments may be performed in an electronic device or similar computing device that includes a memory and a processor in a vehicle. Taking the example of an electronic device operating on a vehicle, as shown in fig. 1, the electronic device of the vehicle may include one or more processors 102 (the processors may include, but are not limited to, Central Processing Units (CPUs), Graphics Processing Units (GPUs), Digital Signal Processing (DSP) chips, Microprocessors (MCUs), programmable logic devices (FPGAs), neural Network Processors (NPUs), Tensor Processors (TPUs), Artificial Intelligence (AI) type processors, etc.) and a memory 104 for storing data. Optionally, the electronic device of the automobile may further include a transmission device 106, an input-output device 108, and a display device 110 for communication functions. It will be understood by those skilled in the art that the structure shown in fig. 1 is merely an illustration and is not intended to limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may also include more or fewer components than described above, or have a different configuration than described above.
The memory 104 can be used for storing computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the information processing method in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, that is, implementing the information processing method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
The display device 110 may be, for example, a touch screen type Liquid Crystal Display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI) with which a user can interact by touching finger contacts and/or gestures on a touch-sensitive surface, where the human-machine interaction function optionally includes the following interactions: executable instructions for creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, emailing, call interfacing, playing digital video, playing digital music, and/or web browsing, etc., for performing the above-described human-computer interaction functions, are configured/stored in one or more processor-executable computer program products or readable storage media.
Fig. 2 is a control method of a high EGR rate exhaust gas recirculation system according to an embodiment of the present invention, as shown in fig. 2, including the steps of:
step S102, collecting working condition information of the engine, wherein the working condition information comprises at least one of the following: the engine is in a working state and the engine is in a stop state.
And step S104, generating a control instruction set by the working condition information.
And S106, controlling the opening and closing of a pre-vortex exhaust gas channel and a post-vortex exhaust gas channel based on the control instruction set, wherein the inlet end of the pre-vortex exhaust gas channel is positioned between the outlet end of the engine and the inlet end of the turbine, and the inlet end of the post-vortex exhaust gas channel is positioned at the downstream of the outlet end of the turbine.
Through the steps, the exhaust gas is divided into two paths after passing through the temperature sensor 20 and the pressure sensor 13, and the working condition can be detected according to the actual condition. Through the steps, the opening degree of the EGR rate adjusting valve can be continuously changed, so that the opening degree can be adjusted according to actual conditions. Through the steps, the exhaust gas amount in the two exhaust gas passages can be flexibly adjusted, and the aim of flexibly and accurately controlling the EGR rate is fulfilled.
In the above steps S102 to S106 of the present application, a circulation path for taking exhaust gas from the front of the turbine of the turbocharger is added on the basis of the low pressure EGR system, and a dual turbine mode is provided in the two pipelines, and by different matching operation strategies of the two exhaust gas circulation paths, the purpose that the two pipelines can be operated independently and opened simultaneously is achieved, thereby achieving the technical effects of improving the EGR rate of the engine and reducing the emission under the condition of ensuring the driving air pressure and the intake air temperature, and further solving the technical problem that the exhaust gas circulation efficiency cannot be fully utilized due to the fact that the pressure difference is small and enough exhaust gas cannot enter the intake pipeline, and the exhaust gas emission can deteriorate.
The above-described method of this embodiment is further described below.
As an alternative embodiment, a control instruction set is generated based on the operating condition information, and the control instruction set controls the opening and closing of the pre-vortex exhaust gas taking passage and the post-vortex exhaust gas taking passage, and includes: and under the condition that the engine is determined to be in the working state, generating a first control instruction in a control instruction set, wherein the first control instruction is used for controlling the opening of the exhaust gas taking passage before the vortex and the closing of the exhaust gas taking passage after the vortex, and controlling the two-stage double turbines on the exhaust gas taking passage before the vortex and the exhaust gas taking passage after the vortex to be in the shutdown state. The setting realizes accurate regulation of EGR rate and high-efficient utilization of exhaust energy through nimble control strategy to the operating condition that the engine is different like this. The exhaust gas circulation strategy before the vortex can be only utilized in the cold start stage of the engine, so that the air inlet temperature of the engine is quickly raised while sufficient exhaust gas circulation is ensured to enter the air inlet pipeline.
Specifically, the method comprises the following steps: and acquiring temperature information between the outlet end of the exhaust gas channel before the vortex and the inlet end of the compressor. Whether the temperature information meets a first preset condition is judged, for example, whether the temperature information is within a certain threshold or outside the threshold is judged. And under the condition that the temperature information is determined to meet the first preset condition, generating a second control instruction in the control instruction set, wherein the second control instruction is used for controlling the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in an open state, and controlling the two-stage double turbines on the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in a shutdown state. The two circulation passages are arranged to recycle exhaust gas together, the EGR rate and the intake air temperature are guaranteed, and the working efficiency of the turbine cannot be influenced by taking excessive exhaust gas in front of the turbocharger. And the accurate adjustment of the EGR rate and the high-efficiency utilization of the exhaust energy can be realized through a flexible control strategy according to different working conditions of the engine.
Specifically, judging whether the temperature information satisfies a first preset condition, and generating a second control instruction in the control instruction set when it is determined that the temperature information satisfies the first preset condition, including: and judging whether the temperature information is greater than the lowest preset temperature value and lower than the combustion temperature limit value. If so, a second control instruction in the control instruction set is generated. The arrangement ensures that the air inlet temperature is in a proper range, and improves the combustion efficiency.
And acquiring the intake pressure under the condition that the temperature information is determined not to meet the first preset condition. It is determined whether the intake air pressure meets a second predetermined condition, such as whether the pressure is within or outside a certain threshold. And under the condition that the air inlet pressure meets a second preset condition, generating a third control instruction in the control instruction set, wherein the third control instruction is used for controlling the closing of the vortex front exhaust gas taking passage and the opening of the vortex rear exhaust gas taking passage, and controlling the two-stage double turbines on the vortex front exhaust gas taking passage and the vortex rear exhaust gas taking passage to be in a shutdown state. Thus, the target EGR rate can be ensured by setting the pressure difference of the exhaust gas after the intake air temperature is raised to the temperature set by the system and the vortex.
And under the condition that the air inlet pressure is determined not to meet the second preset condition, generating a fourth control instruction in the control instruction set, wherein the fourth control instruction is used for controlling the exhaust gas taking passage before the vortex to be closed and controlling the exhaust gas taking passage after the vortex to be opened, and controlling the two-stage double turbines on the exhaust gas taking passage before the vortex and the exhaust gas taking passage after the vortex to be in a working state. The turbine front exhaust passage is used for supercharging the turbine rear exhaust passage, and sufficient exhaust gas can enter the air inlet pipeline to be recycled, so that the EGR rate is improved.
As an alternative embodiment, the determining whether the intake pressure meets the second preset condition, and in the case that it is determined that the intake pressure meets the second preset condition, generating a third control command in the control command set includes: it is determined whether the intake pressure is less than a pressure value at the inlet end of the post-vortex exhaust gas passageway downstream of the turbine outlet end. If so, a third control instruction in the set of control instructions is generated. Such an arrangement secures the EGR rate, the magnitude of which is controlled by the EGR rate adjustment valve 11, in accordance with the pressure difference.
There is also provided, in accordance with an embodiment of the present invention, a power system, as shown in fig. 3, including: an acquisition unit 40, a generation unit 42 and a control unit 44. The acquisition unit is used for acquiring the working condition information of the engine, wherein the working condition information comprises at least one of the following: the engine is in a working state and the engine is in a stop state. The generating unit is used for generating a control instruction set based on the working condition information. The control unit is used for controlling the opening and closing of a pre-vortex exhaust gas passage and a post-vortex exhaust gas passage based on a control instruction set, wherein the inlet end of the pre-vortex exhaust gas passage is positioned between the outlet end of the engine and the inlet end of the turbine, and the inlet end of the post-vortex exhaust gas passage is positioned at the downstream of the outlet end of the turbine.
Specifically, as shown in fig. 4, the present application provides a high EGR rate exhaust gas recirculation system, which adds a branch of exhaust gas recirculation from the turbine of the turbocharger to a low pressure EGR system, and provides dual turbines in the two lines. Through the different exhaust gas circulation schemes of intelligent selection, realize that low emission and high EGR rate control circulation system of engine exhaust gas recirculation system includes: the engine comprises an engine cylinder 1, an intake charge air cooler 2, a compressor 3, a turbine 4, an air filter 5, an EGR cooler 6, an EGR cooler 7, a turbine 8, a turbine 9, an EGR rate adjusting valve 10, an EGR rate adjusting valve 11, a pressure sensor 12, a pressure sensor 13, a pressure sensor 14, an EGR flow control valve 15, an EGR flow control valve 16, an EGR switch valve 17, an EGR switch valve 18, a temperature sensor 19, a temperature sensor 20, a temperature sensor 21, an EGR switch valve 22 and an EGR switch valve 23. The turbines 8 and 9 are two-stage twin turbines. In the embodiment, the exhaust gas of the engine cylinder 1 is divided into two branches after passing through the temperature sensor 20 and the pressure sensor 13, one branch is a turbine exhaust gas taking branch (i.e. a turbine exhaust gas taking branch), and the exhaust gas taking branch passes through the EGR flow control valve 15, the EGR cooler 6 and the EGR switch valve 22, and the turbine 9 and the EGR rate adjusting valve 11 are connected into an intake pipe in front of the compressor 3; the other branch is a post-turbine exhaust gas taking pipeline, and the exhaust gas passes through the turbine 4 and then is sequentially connected with the pressure sensor 14, the temperature sensor 21, the EGR flow control valve 16, the EGR cooler 7, the EGR switch valve 23, the turbine 8 and the EGR rate adjusting valve 10.
The waste gas of the EGR cooler 6 is divided into two branches, one branch passes through an EGR switch valve 22 and a turbine 9 in a two-stage double turbine, the other branch is controlled by an EGR switch valve 17, the waste gas of the EGR cooler 7 is divided into two branches, one branch passes through an EGR switch valve 23 and a turbine 8 in the two-stage double turbine, the other branch is controlled by an EGR switch valve 18, the opening degree of the EGR rate regulating valve is continuously variable, the opening degree can be regulated according to actual conditions, the temperature of the cooled waste gas can be regulated according to the actual conditions by the EGR cooler controller, a pressure sensor 12 is arranged between an air inlet and the connection part of the waste gas taking branch after the turbine and an air inlet pipe and is used for detecting the air inlet pressure at the air inlet in real time, a pressure sensor 13 is arranged between the outlet of an engine cylinder and the connection part of the waste gas taking before the turbine and is used for detecting the exhaust pressure discharged from the engine cylinder in real time, and a pressure sensor 14 is arranged behind the turbine, for detecting in real time the exhaust gas pressure after passing through the turbine, a temperature sensor 19 is installed at the inlet of the intake port for detecting in real time the intake air temperature, and a temperature sensor 20 is installed between the outlet of the engine cylinder 1 and the pressure sensor 13 for detecting in real time the exhaust gas temperature discharged from the engine cylinder.
In this embodiment, a method of taking two exhaust gas circulation lines respectively in front of and behind a turbocharger is utilized, and different matching operation strategies of the two exhaust gas circulation branches are adopted according to the operation states of the engine at different moments, so that the two exhaust gas circulation lines can be operated independently and can be opened simultaneously, and the EGR rate of the engine and the exhaust emission can be improved and reduced under the condition of ensuring the driving air pressure and the air inlet temperature.
As shown in FIG. 5, the temperature detected by the temperature sensor 19 is T E The temperature measured by the temperature sensor 20 is T O1 The temperature measured by the temperature sensor 21 is T 02 The pressure measured by the pressure sensor 12 is P E The pressure measured by the pressure sensor 13 is P 01 The pressure measured by the pressure sensor 14 is P 02 The appropriate temperature for combustion in the engine cylinder 1 according to the set requirement is T OL ～T OH . According to the pressure and temperature measured in each position of the pipeline, different exhaust gas circulation modes are adopted, and the high EGR rate and the efficient combustion of the engine are ensured.
Wherein the engine is in a cold start phase and the intake air temperature T E <System set dimension minimum T OL At this time, only the EGR flow rate control valve 15 and the EGR opening/closing valve 17 are opened, and after the exhaust gas is discharged from the engine cylinder 1, a part of the exhaust gas passes through the turbine 4 and the air cleaner 5 and is directly discharged, and another part of the exhaust gas passes through the EGR flow rate control valve 15, the EGR cooler 6, the EGR opening/closing valve 17, and the EGR rate adjusting valve 11. The exhaust gas is higher in temperature discharged from the cylinder, the gas is directly taken from the front of the turbine 4, the air inlet temperature is favorably and quickly improved, the combustion efficiency of the engine during starting is improved, the optimal temperature of the exhaust gas can be regulated by the EGR cooler 6 after being calculated by the ACU control system, because the pressure of the exhaust gas before vortex is higher, the exhaust gas has enough pressure difference with an air inlet pipeline to ensure the EGR rate, and the amount of the exhaust gas is controlled by the EGR rate regulating valve 11.
When the automobile is running, the air inlet temperature TE is higher than the system set temperature T OL And is below the combustion temperature limit T OH At this moment, the EGR flow control valve 15, the EGR flow control valve 16, the EGR switch valve 17 and the EGR switch valve 18 are opened, and the exhaust passage is taken before the vortex and the exhaust passage is taken after the vortex and is opened simultaneously, so that the working efficiency of the turbocharger is ensured while the air inlet temperature can be more effectively controlled and improved. And the air inlet proportion between the two exhaust gas passages is adjusted according to the feedback information of the ACU control system, so that the air inlet temperature is ensured to be in a proper range, and the combustion efficiency is improved.
As an alternative embodiment, the intake air temperature T is set during the driving of the vehicle E Continuously rising and above the combustion temperature limit T set by the system OH It is not suitable to continue taking exhaust gas from before the vortex, and taking exhaust gas before the vortex reduces the working efficiency of the turbocharger. At this time, the intake pressure PE is determined by the pressure sensor 12, and the exhaust pressure P at the inlet of the exhaust gas passageway before the vortex is determined by the pressure sensor 13 01 The pressure sensor 14 determines the exhaust pressure P at the inlet of the post-vortex exhaust gas passageway 02 . When the intake pressure P is E ＜P 02 When the air conditioner is in use, the EGR flow control valve 16 and the EGR switch valve 18 are opened, the EGR flow control valve 15 and the EGR switch valve 17 are closed, the exhaust gas taking passage before the vortex is closed, the exhaust gas taking passage after the turbine is opened, the exhaust gas discharged from the engine cylinder 1 only passes through the exhaust gas recirculation system from the exhaust gas taking passage after the vortex, and the ACU control system controls the EGR rate regulating valve 10 to control the air intake proportion of the exhaust gas air intake quantity according to the target EGR rate.
When the automobile is running, the air inlet pressure P is used E Exhaust pressure P > at the inlet of the post-vortex exhaust gas passageway 02 In the meantime, the pressure difference between the exhaust gas intake passage and the intake pipe after the vortex cannot allow sufficient exhaust gas to be mixed with intake air, and the target EGR rate cannot be satisfied. At this moment, the EGR flow control valve 15, the EGR flow control valve 16, the EGR switch valve 22 and the EGR switch valve 23 are opened, the turbine 8 and the turbine 9 are utilized to pressurize the recirculated exhaust gas after the vortex in the exhaust gas taking passage before the vortex, the amount of the exhaust gas in the two exhaust gas passages is flexibly adjusted through the ACU control system, the aim of flexibly and accurately controlling the EGR rate is achieved, meanwhile, the air inlet temperature information is fed back to the EGR cooler 6 and the EGR cooler 7, and the air inlet temperature can be better promoted to combust.
There is also provided, in accordance with an embodiment of the present invention, a computer-readable storage medium, including: a stored program, wherein the program when executed controls an apparatus in which a computer readable storage medium stores instructions for executing the control method of the high EGR rate exhaust gas recirculation system according to the embodiment of the present invention.
According to an embodiment of the invention, there is also provided a processor for running a program, wherein the program when running performs the control method of the high EGR rate exhaust gas recirculation system of the embodiment of the invention.
In another embodiment of the present application, as shown in fig. 4, after passing through the temperature sensor 20 and the pressure sensor 13, the exhaust gas of the engine cylinder 1 is divided into two paths, one path is a turbine pre-fetching exhaust gas path (i.e. a vortex pre-fetching exhaust gas path in the above embodiment), and the turbine 9 and the EGR rate adjusting valve 11 are connected into an intake pipe in front of the compressor 3 through the EGR flow control valve 15, the EGR cooler 6 and the EGR switch valve 22; the other passage is a post-swirl exhaust gas passage, and the exhaust gas passes through the turbine 4 and is connected in order to the pressure sensor 14, the temperature sensor 21, the EGR flow rate control valve 16, the EGR cooler 7, the EGR opening/closing valve 23, the turbine 8, and the EGR rate adjustment valve 10. The exhaust gas of the EGR cooler 6 is divided into two paths, one path passing through the EGR switching valve 22 and the turbine 9 in the two-stage twin turbine, and the other path being controlled by the EGR switching valve 17. The exhaust gas of the EGR cooler 7 is divided into two paths, one path passing through the EGR opening/closing valve 23 and the turbine 8, and the other path being controlled by the EGR opening/closing valve 18. The opening degree of the EGR rate regulating valve is continuously variable, and the opening degree can be regulated according to actual conditions. Also, the EGR cooling controller may adjust the temperature of the cooled exhaust gas according to actual conditions. The pressure sensor 12 is installed between the air inlet and the connection between the exhaust gas taking path and the air inlet pipe behind the turbine, and is used for detecting the air inlet pressure at the air inlet in real time. A pressure sensor 13 is mounted between the engine cylinder outlet and the exhaust gas take-off connection in front of the turbine for real-time sensing of the exhaust pressure exiting the engine cylinder. A pressure sensor 14 is installed behind the turbine for detecting the exhaust gas pressure after passing through the turbine in real time. The temperature sensor 19 is installed at the inlet of the air inlet and used for detecting the temperature of the inlet air in real time. A temperature sensor 20 is installed between the outlet of the engine cylinder 1 and the pressure sensor 13 for detecting the temperature of the exhaust gas discharged from the engine cylinder in real time.
The application introduces another branch circuit for taking exhaust gas from the front of the turbine and combines with low-pressure EGR, and aiming at different working conditions of the engine, the accurate adjustment of the EGR rate and the efficient utilization of the energy of the exhaust gas are realized through a flexible control strategy. The exhaust gas circulation strategy before the vortex can be only utilized in the cold start stage of the engine, so that the air inlet temperature of the engine is quickly raised while sufficient exhaust gas circulation is ensured to enter an air inlet pipeline; the exhaust gas is taken out after the automobile runs for a period of time after the vortex is introduced, and the two circulation branches recycle the exhaust gas together, so that the working efficiency of the turbine is not influenced by taking too much exhaust gas in front of the turbocharger while the EGR rate and the air inlet temperature are ensured; when the inlet air temperature is raised to the temperature set by the system and the pressure difference of the exhaust gas taken after the vortex can ensure the target EGR rate, only the exhaust gas taken after the turbine is recycled, namely the traditional low-pressure EGR system; get behind turbo charger the pressure differential of waste gas branch road and can't drive sufficient waste gas and enter into the air intake pipe, when unable achievement target EGR rate, two exhaust gas circulation passageways open simultaneously before the whirlpool and behind the whirlpool, utilize two turbo structures of second grade, utilize the whirlpool before the waste gas branch road for the whirlpool after the waste gas branch road carries out the pressure boost, guarantee that sufficient waste gas can enter into in the air intake pipe by cyclic utilization to this promotes EGR rate. Compare in traditional turbo charger, the structural strength of turbine ratio compressor is higher, and is better to the tolerance degree of high temperature waste gas.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of controlling a high EGR rate exhaust gas recirculation system, comprising:
collecting working condition information of an engine, wherein the working condition information comprises at least one of the following conditions: the engine is in a working state and is in a stop state;
generating a control instruction set based on the working condition information;
controlling opening and closing of a pre-vortex exhaust gas passageway and a post-vortex exhaust gas passageway based on the set of control instructions, wherein an inlet end of the pre-vortex exhaust gas passageway is located between an outlet end of the engine and an inlet end of a turbine, and the inlet end of the post-vortex exhaust gas passageway is located downstream of the outlet end of the turbine.
2. The method of claim 1, wherein generating a control command set based on the operating condition information, and controlling opening and closing of the pre-swirl and post-swirl exhaust gas passageways based on the control command set comprises:
and under the condition that the engine is determined to be in the working state, generating a first control instruction in the control instruction set, wherein the first control instruction is used for controlling the before-vortex exhaust gas taking passage to be opened and the after-vortex exhaust gas taking passage to be closed, and controlling two-stage double turbines on the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in a shutdown state.
3. The method of claim 2, wherein the method comprises:
acquiring temperature information between the outlet end of the pre-vortex exhaust gas taking passage and the inlet end of the compressor;
judging whether the temperature information meets a first preset condition or not;
and under the condition that the temperature information is determined to meet the first preset condition, generating a second control instruction in the control instruction set, wherein the second control instruction is used for controlling the exhaust gas taking passage before the vortex and the exhaust gas taking passage after the vortex to be in an open state, and controlling the two-stage double turbines on the exhaust gas taking passage before the vortex and the exhaust gas taking passage after the vortex to be in a shutdown state.
4. The method of claim 3, wherein determining whether the temperature information satisfies a first preset condition, and in a case that it is determined that the temperature information satisfies the first preset condition, generating a second control command in the control command set comprises:
judging whether the temperature information is larger than a minimum preset temperature value and lower than a combustion temperature limit value;
and if so, generating a second control instruction in the control instruction set.
5. The method of claim 3,
acquiring intake pressure under the condition that the temperature information is determined not to meet the first preset condition;
judging whether the air inlet pressure meets a second preset condition or not;
and under the condition that the air inlet pressure meets the second preset condition, generating a third control instruction in the control instruction set, wherein the third control instruction is used for controlling the vortex front exhaust gas taking passage to be closed, controlling the vortex rear exhaust gas taking passage to be opened, and controlling the two-stage double turbines on the vortex front exhaust gas taking passage and the vortex rear exhaust gas taking passage to be in a shutdown state.
6. The method of claim 5,
and under the condition that the air inlet pressure is determined not to meet the second preset condition, generating a fourth control instruction in the control instruction set, wherein the fourth control instruction is used for controlling the before-vortex exhaust gas taking passage to be closed and the after-vortex exhaust gas taking passage to be opened, and controlling two-stage double turbines on the before-vortex exhaust gas taking passage and the after-vortex exhaust gas taking passage to be in a working state.
7. The method of claim 5, wherein determining whether the intake air pressure satisfies a second preset condition, and in the event that the intake air pressure is determined to satisfy the second preset condition, generating a third control command of the set of control commands comprises:
determining whether the inlet pressure is less than a pressure value at an inlet end of the post-vortex exhaust gas passageway downstream of the turbine outlet end;
if so, generating a third control instruction in the control instruction set.
8. A power system, comprising:
the acquisition unit is used for acquiring the working condition information of the engine, wherein the working condition information comprises at least one of the following: the engine is in a working state and is in a stop state;
a generating unit, configured to generate a control instruction set based on the operating condition information;
and the control unit is used for controlling the opening and closing of a pre-vortex exhaust gas passage and a post-vortex exhaust gas passage based on the control instruction set, wherein the inlet end of the pre-vortex exhaust gas passage is positioned between the outlet end of the engine and the inlet end of the turbine, and the inlet end of the post-vortex exhaust gas passage is positioned at the downstream of the outlet end of the turbine.
9. A computer-readable storage medium, characterized by comprising a stored program, wherein the computer-readable storage medium, when the program is executed, controls an apparatus in which the computer-readable storage medium is located to perform the control method of the high EGR rate exhaust gas recirculation system according to any one of claims 1 to 7.
10. A processor for running a program, wherein the program is run to perform the control method of the high EGR rate exhaust gas recirculation system of any one of claims 1 to 7.
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| CN202210690091.0A CN115075966A (en) | 2022-06-17 | 2022-06-17 | Control method of high EGR (exhaust gas Recirculation) rate exhaust gas Recirculation System and power system |
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| CN202210690091.0A CN115075966A (en) | 2022-06-17 | 2022-06-17 | Control method of high EGR (exhaust gas Recirculation) rate exhaust gas Recirculation System and power system |
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| WO2008068574A1 (en) * | 2006-12-01 | 2008-06-12 | Toyota Jidosha Kabushiki Kaisha | Egr system for internal combustion engine and method for controlling the same |
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| CN207761832U (en) * | 2017-12-27 | 2018-08-24 | 潍柴动力股份有限公司 | A kind of egr system |
| CN111120154A (en) * | 2019-12-27 | 2020-05-08 | 潍柴动力股份有限公司 | Low-pressure exhaust gas recirculation system and engine |
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| WO2008068574A1 (en) * | 2006-12-01 | 2008-06-12 | Toyota Jidosha Kabushiki Kaisha | Egr system for internal combustion engine and method for controlling the same |
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