CN113944552B - Control method, device, equipment and medium for two-stage supercharging system - Google Patents
Control method, device, equipment and medium for two-stage supercharging system Download PDFInfo
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- CN113944552B CN113944552B CN202111014474.8A CN202111014474A CN113944552B CN 113944552 B CN113944552 B CN 113944552B CN 202111014474 A CN202111014474 A CN 202111014474A CN 113944552 B CN113944552 B CN 113944552B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000011217 control strategy Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000010365 information processing Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/02—Drives of pumps; Varying pump drive gear ratio
- F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
- F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
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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
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a control method, a device, equipment and a medium of a two-stage supercharging system, which comprise the following steps: when the engine has a supercharging requirement and the turbocharger is in an opening state, acquiring the current rotating speed of the engine; determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed; inquiring a critical flow pressure ratio curve, and determining a critical supercharging pressure ratio under the condition of pre-estimated air inflow according to the surge margin of the turbocharger; and when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio, opening a bypass valve of the engine, and closing an electric supercharger of the engine. According to the method and the device, when the turbocharger can meet the engine requirement, only the turbocharger is used for supercharging, so that the electric supercharger is not used when the turbocharger is unnecessary, the energy consumption of the whole automobile is reduced, meanwhile, the control strategy is simplified, the supercharging control efficiency and accuracy are improved, and the matching speed of the engine and the supercharger is improved when the two-stage superchargers are switched.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method, a device, equipment and a medium of a two-stage supercharging system.
Background
With the development of the automobile industry, the power requirement on the engine is higher and higher. To improve engine dynamics and economy, a two-stage supercharging system is typically employed. By adopting the two-stage supercharging system, the vehicle can obtain higher air inlet pressure, and the dynamic property of the engine is improved.
In the related art, the supercharging method of the two-stage supercharging system is generally determined only based on the rotation speed, but when the two-stage supercharger is switched by using the method, the matching speed between the engine and the supercharger is slow, so that the vehicle is easy to feel a jerk, and the vehicle power response speed is further poor.
Disclosure of Invention
According to the control method, device, equipment and medium for the two-stage supercharging system, the technical problem that the matching speed between an engine and a supercharger is low when the two-stage supercharger is switched in the prior art is solved, and the technical effect that the matching speed between the engine and the supercharger is improved when the two-stage supercharger is switched is achieved.
In a first aspect, the present application provides a method for controlling a two-stage supercharging system, the two-stage supercharging system including a turbocharger and an electric supercharger, the method comprising:
when the engine has a supercharging requirement and the turbocharger is in an opening state, acquiring the current rotating speed of the engine;
determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed;
acquiring a critical supercharging pressure ratio of an engine at a current rotating speed;
and when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio, opening a bypass valve of the engine, and closing an electric supercharger of the engine.
Further, when the target boost pressure ratio is greater than the critical boost pressure ratio, the method further includes:
the bypass valve of the engine is closed and the electric supercharger of the engine is opened.
Further, when the target boost pressure ratio is greater than the critical boost pressure ratio, the method further includes:
and determining the target duty ratio of the electric supercharger according to the target supercharging pressure ratio and the critical supercharging pressure ratio.
Further, determining an estimated intake air amount and a target boost pressure ratio of the engine at the current rotational speed includes:
acquiring an accelerator pedal signal of an engine;
determining a target demand load rate of the engine according to the accelerator pedal signal;
and determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed according to the current rotating speed and the target demand load ratio.
Further, obtaining a critical boost pressure ratio of the engine at the current rotation speed comprises the following steps:
and determining the critical supercharging pressure ratio of the engine at the current rotating speed according to the surge parameter of the turbocharger of the engine.
In a second aspect, the present application provides a two-stage supercharging system control apparatus, the two-stage supercharging system including a turbocharger and an electric supercharger, the apparatus comprising:
the acquisition module is used for acquiring the current rotating speed of the engine when the engine has a supercharging requirement and the turbocharger is in an opening state;
the determining module is used for determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed;
the acquisition module is used for acquiring the critical supercharging pressure ratio of the engine at the current rotating speed;
and the execution module is used for opening a bypass valve of the engine and closing an electric supercharger of the engine when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio.
Further, the apparatus further comprises:
and the execution module is also used for closing a bypass valve of the engine and opening an electric supercharger of the engine when the target supercharging pressure ratio is larger than the critical supercharging pressure ratio.
Further, the apparatus further comprises:
the determining module is further used for determining the target duty ratio of the electric supercharger according to the target supercharging pressure ratio and the critical supercharging pressure ratio.
In a third aspect, the present application provides an electronic device, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to execute to implement a two-stage supercharging system control method.
In a fourth aspect, the present application provides a non-transitory computer readable storage medium that, when executed by a processor of an electronic device, enables the electronic device to perform a method of implementing a two-stage supercharging system control.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the method comprises the steps of firstly determining whether the engine has a supercharging requirement, and if so, controlling the turbocharger to be started to provide the supercharging requirement for the engine; and determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed, and opening a bypass valve of the engine to close an electric supercharger of the engine when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio. That is, when the turbocharger can meet the engine requirement, only the turbocharger is used for supercharging, so that the electric supercharger is not used when the turbocharger is unnecessary, the energy consumption of the whole vehicle is reduced, meanwhile, the control strategy is simplified, the supercharging control efficiency and accuracy are improved, and the matching speed of the engine and the supercharger when the two-stage superchargers are switched is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a two-stage supercharging system according to the present embodiment;
fig. 2 is a flow chart of a control method of a two-stage supercharging system according to the present embodiment;
FIG. 3 is a schematic diagram of a critical supercharging pressure ratio curve according to the present embodiment;
fig. 4 is a schematic structural diagram of a control device of a two-stage supercharging system according to the present embodiment;
fig. 5 is a schematic structural diagram of an electronic device according to the present embodiment.
Detailed Description
The embodiment of the application solves the technical problem that the matching speed between an engine and a supercharger is slower when the two-stage supercharger is switched in the prior art by providing the control method of the two-stage supercharging system.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
a method of controlling a two-stage supercharging system, the two-stage supercharging system including a turbocharger and an electric supercharger, the method comprising: when the engine has a supercharging requirement and the turbocharger is in an opening state, acquiring the current rotating speed of the engine; determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed; acquiring a critical supercharging pressure ratio of an engine at a current rotating speed; and when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio, opening a bypass valve of the engine, and closing an electric supercharger of the engine.
In the embodiment, whether the engine has a supercharging requirement is firstly determined, if so, the turbocharger is controlled to be started, and the supercharging requirement is provided for the engine; and determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed, and opening a bypass valve of the engine to close an electric supercharger of the engine when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio. That is, when the turbocharger can meet the engine requirement, only the turbocharger is used for supercharging, so that the electric supercharger is not used when the turbocharger is unnecessary, the energy consumption of the whole vehicle is reduced, meanwhile, the control strategy is simplified, the supercharging control efficiency and accuracy are improved, and the matching speed of the engine and the supercharger when the two-stage superchargers are switched is improved.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In order to improve the power and economy of an engine at lower speeds, vehicles typically employ a two-stage supercharging system of a turbocharger and an electric supercharger. In the related art, a control scheme of a two-stage supercharging system is provided, specifically, a rotation speed interval determined by a critical rotation speed lower limit and a critical rotation speed upper limit is set by taking rotation speed as a switching standard. When the rotating speed is lower than the critical rotating speed lower limit, an electric supercharger is singly adopted; when the rotating speed is between the critical rotating speed lower limit and the critical rotating speed upper limit, two-stage supercharging is adopted; when the rotational speed is higher than the critical rotational speed upper limit, the turbocharger alone is employed.
According to the scheme, the switching smoothness between the electric supercharger and the turbocharger can be improved to a certain extent, but when the engine is in a low-load running state, the problem that the engine load is not matched with the supercharging mode exists, namely the matching speed between the engine and the supercharger is slower, the vehicle is easy to feel the shock, and the vehicle power response speed is poor.
For example, when the rotation speed is within the above-determined rotation speed range, the above-described technical solution adopts a two-stage supercharging mode. However, in this rotation speed range, the engine demand load may be relatively low, only the turbocharger needs to be adopted at this time, but the control principle of the scheme still adopts the two-stage supercharging mode, and the turbocharger and the electric supercharger must be adjusted simultaneously by using the two-stage supercharging mode, so that the adjustment and control modes are complex, the operation process is complex, and the matching speed between the engine and the supercharger is further reduced. For example, regarding the target supercharging requirement of the engine as 1, the turbocharger and the electric supercharger jointly form 1, and the turbocharger and the electric supercharger respectively occupy a plurality of ratios, and meanwhile, whether the matching between the air inflow of the turbocharger and the electric supercharger and the air inflow of the engine, the exhaust emission of the turbocharger and the air inflow of the engine can be in virtuous cycle needs to be considered, so that the regulation and control mode is complex, the matching speed between the engine and the supercharger can be reduced, the vehicle is easy to feel the frustration, and the vehicle power response speed difference is further caused.
In addition, in the above technical solution, when the engine load is low, it is possible to use only the turbocharger for supercharging, and the turbocharger itself is dependent on the exhaust gas for energy supply, so that the energy consumption is negligible. However, the above scheme uses two-stage supercharging under the condition, and an electric supercharger is additionally added on the basis of turbocharging, so that the comprehensive energy consumption of the vehicle is high. That is, the above-described scheme uses the electric supercharger when the turbocharger does not exert the maximum load factor, which results in a high overall energy consumption of the vehicle.
In order to solve the above technical problems, the present embodiment provides a control method of a two-stage supercharging system, where the two-stage supercharging system may be as shown in fig. 1, and external atmosphere enters an engine through an air filter, and a bypass valve is used to cooperate with opening and closing of an electric supercharger. When the electric supercharger is in an open state, the bypass valve is in a closed state, and when the electric supercharger is in a closed state, the bypass valve is in an open state. The outside atmosphere reaches the turbocharger through a bypass valve or an electric supercharger, the turbocharger comprises a turbine and an impeller, the turbine is arranged at the tail part of the exhaust manifold, and the impeller is arranged in front of the intercooler. The turbine contacts with tail gas in the exhaust manifold, the tail gas drives the turbine to rotate, the turbine drives the impeller to rotate, the impeller conveys air to the intercooler, the air enters the air inlet manifold through the intercooler and finally enters the air cylinder to be burnt by the air cylinder. Exhaust gas generated by the cylinder is discharged into an exhaust pipe through an exhaust manifold, a catalyst in the exhaust pipe is used for treating the exhaust gas, and the exhaust gas is discharged into the atmosphere through a muffler.
As shown in fig. 2, the control method of the two-stage supercharging system provided in this embodiment is applied to a vehicle controller, and the method includes steps S21-S25.
Step S21, when the engine has a supercharging requirement and the turbocharger is in an on state, acquiring the current rotation speed of the engine.
Step S22, determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed (the pressure ratio refers to the absolute pressure of the outlet of the compressor divided by the absolute pressure of the inlet of the compressor, and is an index for representing the supercharging degree of the compressor).
Step S23, obtaining a critical boost pressure ratio of the engine at the current rotation speed.
And step S24, when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio, opening a bypass valve of the engine, and closing an electric supercharger of the engine.
Step S25, when the target supercharging pressure ratio is larger than the critical supercharging pressure ratio, a bypass valve of the engine is closed, and an electric supercharger of the engine is started. And determining a target duty cycle of the electric supercharger based on the target boost pressure ratio and the critical boost pressure ratio.
In a specific implementation, the turbocharger is always in operation as long as the engine has a boost demand. That is, when the turbocharger can meet the engine demand, only the turbocharger is used for supercharging, and when the turbocharger is in the maximum running state, the electric supercharger is used for compensating the residual supercharging demand when the turbocharger cannot meet the engine demand, so that the electric supercharger is not used when the turbocharger is unnecessary, the energy consumption of the whole vehicle is reduced, the control strategy is simplified, and the supercharging control efficiency and accuracy are improved.
In step S21, the vehicle control unit determines the current rotation speed of the engine. In step S22, step S31-step S33 may also be employed to determine the estimated intake air amount and the target boost pressure ratio of the engine at the current rotation speed, while the current rotation speed is determined.
Step S31, an accelerator pedal signal of the engine is acquired.
Step S32, determining a target demand load rate of the engine according to the accelerator pedal signal.
And step S33, determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed according to the current rotating speed and the target demand load rate.
When the engine is calibrated and developed, the charging efficiency scanning point is carried out, a plurality of supercharging pressure-charging efficiency data tables under different intake and exhaust VVT combinations are completed, and the tables are stored in the whole vehicle controller. When the engine runs, the whole vehicle controller determines target boost pressure at real-time rotating speed according to load rate requirements, and determines estimated air inflow according to the target boost pressure and intake and exhaust VVT combination.
The accelerator pedal signal can be determined according to the accelerator pedal travel signal, and the current target demand load rate required by the engine can be calculated according to the depth of the accelerator pedal.
And determining the target required torque according to the current rotating speed and the target required load rate. According to the target required torque, the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed can be determined.
In step S23, the step S41 of acquiring the critical supercharging pressure ratio of the engine at the current rotation speed may be included.
Step S41, determining the critical supercharging pressure ratio of the engine at the current rotating speed according to the surge parameter of the turbocharger of the engine.
That is, the critical supercharging pressure ratio at the current rotation speed is determined from the surge curve of the turbocharger of the engine, and the critical supercharging pressure ratio is the pressure ratio at which the turbocharger does not surge. Specifically, the turbocharger of the engine may be detected to detect the relationship between the intake air amount and the pressure ratio thereof, and then determine the critical pressure ratio curve as shown in fig. 3.
Of course, the relation between the intake air flow and the pressure ratio in the critical pressure ratio curve can be stored in the local memory of the vehicle, when the critical pressure ratio needs to be determined, the relation can be directly obtained from the memory, and then the real-time calculation is not needed, the calculation resource of the whole vehicle controller can be saved, the obtaining efficiency of the critical pressure ratio can be improved, the control efficiency of the two-stage supercharger is improved, and the matching speed between the engine and the supercharger is also improved to a certain extent.
In step S26, it is determined whether the target boost pressure ratio is not greater than the critical boost pressure ratio. As shown in fig. 3, step S26 is to determine whether the target boost pressure ratio under the estimated intake air amount is on the upper side of the threshold boost pressure ratio curve. When the target boost pressure ratio is greater than the critical boost pressure ratio, it means that if the turbocharger is relied on, the turbocharger will surge, and in order to avoid the occurrence of the surge phenomenon, the electric supercharger needs to be turned on to realize two-stage supercharging. When the target boost pressure ratio is not greater than the critical boost pressure ratio, the method means that the boost requirement of the engine can be met even though the turbocharger is only relied on, and the electric supercharger is not required to be started, so that the independent boost operation of the turbocharger is realized.
In step S24, when the target boost pressure ratio is not greater than the threshold boost pressure ratio, a bypass valve of the engine is opened, and an electric supercharger of the engine is turned off. As can be seen in connection with fig. 1, the atmosphere can be directly admitted to the turbocharger via the bypass valve without going through the electric supercharger, thus achieving a separate supercharging operation of the turbocharger.
The problem of low matching speed between the engine and the supercharger caused by the fact that two-stage supercharging is adopted when the engine is in a low-load running state can be solved, the matching speed between the engine and the supercharger is improved, the vehicle jerk is reduced, and the vehicle power response speed is improved. In addition, when the supercharging requirement provided by the turbocharger can meet the engine requirement, the electric supercharger is turned off, so that the electric supercharger can be prevented from generating unnecessary energy, the electric quantity of a battery is saved, and further the comprehensive energy consumption of a vehicle can be reduced.
In step S25, when the target boost pressure ratio is greater than the threshold boost pressure ratio, the bypass valve of the engine is closed, and the electric supercharger of the engine is turned on.
When the target boost pressure ratio is greater than the critical boost pressure ratio, it means that if the turbocharger is relied on, the turbocharger will surge, and in order to avoid the occurrence of the surge phenomenon, the electric supercharger needs to be turned on to realize two-stage supercharging. The electric supercharger is used for determining the supercharging amplitude by the duty ratio, so that the target duty ratio of the electric supercharger is determined according to the target supercharging pressure ratio and the critical supercharging pressure ratio, and the electric supercharger is used for supercharging at the duty ratio.
A specific example is now provided:
when a driver steps on an accelerator, the depth of the accelerator is 100%, and according to the opening of the accelerator, the load demand of the engine is calculated to be 100% by utilizing the relation between the accelerator pedal and the engine performance demand.
The ECU reads the real-time rotating speed of the engine to be 1500 revolutions, and determines that the corresponding estimated air inflow is 0.38kg/s when the engine rotates 1500 revolutions according to the load demand, and the target supercharging pressure ratio is 2.1.
Inquiring a critical flow pressure ratio curve, considering the surge margin of the turbocharger, determining that the critical supercharging pressure ratio of the compressor at the current flow is 2.0, judging the magnitude relation between the target pressure ratio and the critical supercharging pressure ratio of the compressor under the condition of pre-estimated air inflow, and determining that the electric supercharger needs to be started.
When the electric supercharger needs to be started, according to the target supercharging pressure ratio, the turbocharger critical supercharging pressure ratio and the two-stage supercharging pressure ratio superposition principle, the pressure ratio requirement of the electric supercharger is determined to be 2.1/2=1.05. And the whole vehicle controller determines a duty ratio signal corresponding to the electric supercharger under the conditions of 0.38kg/s of target flow and 1.05 of target supercharging pressure ratio according to the performance data sheet of the electric supercharger, and inputs a control signal to the electric supercharger. Turbocharger matching was then performed to achieve a target pressure ratio of 2.1.
In summary, the present embodiment determines the estimated intake air amount and the target boost pressure ratio of the engine at the current rotation speed, and opens the bypass valve of the engine to close the electric supercharger of the engine when the target boost pressure ratio is not greater than the threshold boost pressure ratio. When the target boost pressure ratio is greater than the critical boost pressure ratio, a bypass valve of the engine is closed, and an electric supercharger of the engine is opened. That is, when the turbocharger can meet the engine requirement, only the turbocharger is used for boosting, and when the turbocharger is in the maximum running state, and the engine requirement cannot be met, the electric supercharger is used for compensating the residual boosting requirement, so that the electric supercharger is not used when the turbocharger is not needed, the energy consumption of the whole vehicle is reduced, meanwhile, the control strategy is simplified, the boosting control efficiency and accuracy are improved, and the matching speed of the engine and the supercharger is improved when the two-stage superchargers are switched.
Based on the same inventive concept, the present embodiment provides a two-stage supercharging system control apparatus as shown in fig. 4, the two-stage supercharging system including a turbocharger and an electric supercharger, the apparatus including:
an obtaining module 41, configured to obtain a current rotation speed of the engine when the engine has a supercharging requirement and the turbocharger is in an on state;
a determining module 42 for determining an estimated intake air amount and a target supercharging pressure ratio of the engine at a current rotation speed;
an obtaining module 41, configured to obtain a critical boost pressure ratio of the engine at a current rotation speed;
the execution module 43 is configured to open a bypass valve of the engine and close an electric supercharger of the engine when the target boost pressure ratio is not greater than the threshold boost pressure ratio.
Further, the execution module 43 is further configured to close a bypass valve of the engine and open an electric supercharger of the engine when the target boost pressure ratio is greater than the threshold boost pressure ratio.
Further, the determining module 42 is further configured to determine a target duty cycle of the electric supercharger according to the target boost pressure ratio and the critical boost pressure ratio.
Further, the acquisition module 41 is further configured to acquire an accelerator pedal signal of the engine;
the determining module 42 is further configured to determine a target demand load rate of the engine according to the accelerator pedal signal; and determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed according to the current rotating speed and the target demand load ratio.
Further, the obtaining module 41 is further configured to: and determining the critical supercharging pressure ratio of the engine at the current rotating speed according to the surge parameter of the turbocharger of the engine.
Based on the same inventive concept, this embodiment provides an electronic device as shown in fig. 5, including:
a processor 51;
a memory 52 for storing instructions executable by the processor 51;
wherein the processor 51 is configured to execute to implement a two-stage supercharging system control method.
Based on the same inventive concept, the present embodiment provides a non-transitory computer-readable storage medium, which when executed by the processor 51 of the electronic device, enables the electronic device to perform implementing a two-stage supercharging system control method.
Since the electronic device described in this embodiment is an electronic device used to implement the method of information processing in this embodiment, those skilled in the art will be able to understand the specific implementation of the electronic device and various modifications thereof based on the method of information processing described in this embodiment, so how the method of this embodiment is implemented in this electronic device will not be described in detail herein. The electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present application falls within the scope of protection intended by the present application.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A two-stage supercharging system control method, characterized in that the two-stage supercharging system includes a turbocharger and an electric supercharger, the method comprising:
when the engine has a supercharging requirement and the turbocharger is in an opening state, acquiring the current rotating speed of the engine;
determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed;
inquiring a critical flow pressure ratio curve, and determining a critical supercharging pressure ratio under the condition of pre-estimated air inflow according to the surge margin of the turbocharger;
and when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio, opening a bypass valve of the engine, and closing the electric supercharger.
2. The method of claim 1, wherein when the target boost pressure ratio is greater than the critical boost pressure ratio, the method further comprises:
and closing a bypass valve of the engine and opening the electric supercharger.
3. The method of claim 2, wherein when the target boost pressure ratio is greater than the critical boost pressure ratio, the method further comprises:
and determining a target duty ratio of the electric supercharger according to the target supercharging pressure ratio and the critical supercharging pressure ratio.
4. The method of claim 1, wherein the determining the estimated intake air amount and the target boost pressure ratio of the engine at the current rotational speed comprises:
acquiring an accelerator pedal signal of the engine;
determining a target demand load rate of the engine according to the accelerator pedal signal;
and determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed according to the current rotating speed and the target demand load rate.
5. A two-stage supercharging system control apparatus, characterized in that the two-stage supercharging system includes a turbocharger and an electric supercharger, the apparatus comprising:
the acquisition module is used for acquiring the current rotating speed of the engine when the engine has a supercharging requirement and the turbocharger is in an opening state;
the determining module is used for determining the estimated air inflow and the target supercharging pressure ratio of the engine at the current rotating speed;
the acquisition module is used for inquiring a critical flow pressure ratio curve and determining a critical supercharging pressure ratio under the estimated air inflow according to the surge allowance of the turbocharger;
and the execution module is used for opening a bypass valve of the engine and closing the electric supercharger when the target supercharging pressure ratio is not greater than the critical supercharging pressure ratio.
6. The apparatus of claim 5, wherein the apparatus further comprises:
the execution module is further used for closing a bypass valve of the engine and opening the electric supercharger when the target supercharging pressure ratio is larger than the critical supercharging pressure ratio.
7. The apparatus of claim 6, wherein the apparatus further comprises:
the determining module is further configured to determine a target duty cycle of the electric supercharger according to the target boost pressure ratio and the critical boost pressure ratio.
8. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute to implement a two-stage supercharging system control method as claimed in any one of claims 1 to 4.
9. A non-transitory computer readable storage medium, which when executed by a processor of an electronic device, causes the electronic device to perform a two-stage supercharging system control method embodying any one of claims 1 to 4.
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