CN115750103A - Anti-surge control method and device, electronic equipment and storage medium - Google Patents
Anti-surge control method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The application discloses an anti-surge control method and device, electronic equipment and a storage medium, and relates to the technical field of control. In the method, during closing of the ETV, the current measurement time and the actual pressure ratio of the gas compressor are determined through the pressure sensor, and then the target pressure ratio section to which the actual pressure ratio belongs is determined based on the candidate pressure ratio section set corresponding to the current reduced flow of the gas compressor, so that the ETV is controlled based on the ETV control mode set corresponding to the target pressure ratio section. By adopting the mode, the technical defects that in the prior art, the closing judgment basis of the ETV is controlled to be simpler only according to whether the closing degree of the ETV reaches the preset threshold value or not, and accurate judgment is not directly carried out according to the factor triggering the surge phenomenon are avoided, so that the accuracy of the anti-surge control of the gas compressor is improved.
Description
Technical Field
The present disclosure relates to the field of control technologies, and in particular, to an anti-surge control method and apparatus, an electronic device, and a storage medium.
Background
The turbocharger is a mechanical structure commonly adopted in the field of automobiles at present, and utilizes the energy of exhaust gas discharged by an engine to drive an exhaust gas turbine, so that the turbine drives a coaxial compressor to do work on air, and compressed air is sent into a cylinder of a gasoline engine.
However, when the working condition of the compressor in the turbocharger changes, a surge phenomenon easily occurs, for example, when the engine runs from a large load area to a small load area (i.e. the Throttle is released) during acceleration and sudden Throttle loss (i.e. deceleration), an electronically controlled Throttle (ETV) is suddenly closed from a small closing degree to a large closing degree, so that a larger intake pressure in an intake pipeline is blocked by the ETV, the flow rate is greatly reduced, the flow of the intake pressure is changed, even the intake pressure flows back to the compressor, the outlet pressure of the compressor fluctuates, and the surge phenomenon occurs, so that the surge phenomenon can cause strong mechanical vibration and hot end over-temperature of the engine, and cause serious damage to the engine in a short time.
In the prior art, in order to prevent the compressor from surging as much as possible, the opening information of the ETV is generally acquired through an electric control unit, and then whether the acquired ETV starts to be closed or not is judged; if yes, judging whether the closing degree of the ETV reaches a preset threshold value, and controlling the ETV to close according to a first operation speed when the closing degree of the ETV does not reach the preset threshold value, wherein the first operation speed is the normal closing speed of the ETV; similarly, when the closing degree of the ETV is determined to reach the preset threshold, the ETV is controlled to be closed according to a second running speed, wherein the second running speed is the closing speed of the ETV according to the preset speed; finally, the ETV is controlled to close to the target position.
Therefore, by adopting the anti-surge control method, the judgment basis for controlling the closing of the ETV by adopting the first running speed or the second running speed is simpler only according to whether the closing degree of the ETV reaches the preset threshold value, and the accurate judgment is not directly carried out according to the factor triggering the surge phenomenon, so that the condition that the surge phenomenon cannot be avoided in the process of controlling the ETV is caused.
Therefore, the accuracy of the compressor anti-surge control is low by adopting the mode.
Disclosure of Invention
The embodiment of the application provides an anti-surge control method and device, electronic equipment and a storage medium, which are used for improving the accuracy of anti-surge control of a gas compressor.
In a first aspect, an embodiment of the present application provides an anti-surge control method, where the method includes:
in the closing process of the ETV, determining the actual pressure ratio of the compressor at the current measuring moment through a pressure sensor; wherein, the actual pressure ratio is characterized: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment;
determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor; wherein, the current reduced flow rate is characterized by: measuring the gas quantity entering the gas compressor at the current moment;
and controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio section.
In a second aspect, an embodiment of the present application further provides an anti-surge control device, where the device includes:
the acquisition module is used for determining the actual pressure ratio of the compressor at the current measurement moment through the pressure sensor in the closing process of the electric control throttle ETV; wherein, the actual pressure ratio is characterized by: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment;
the determining module is used for determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor; wherein, the current reduced flow is characterized by: measuring the gas quantity entering the compressor at the current moment;
and the control module is used for controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval.
In a possible embodiment, when determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to a current reduced flow of the compressor, the determining module is specifically configured to:
determining a surge pressure ratio matched with the current reduced flow from a preset gas compressor operation database, and obtaining a corresponding strong critical pressure ratio, a corresponding weak critical pressure ratio upper limit and a corresponding weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
obtaining a candidate pressure ratio interval set corresponding to the current reduced flow based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit;
and determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set.
In a possible embodiment, the target pressure ratio interval is a first candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the first candidate pressure ratio interval is greater than the strong critical pressure ratio;
when the ETV is controlled based on the ETV control method set in the corresponding target pressure ratio interval, the control module is specifically configured to:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to a preset fixed valve opening; wherein, the fixed valve opening satisfies the preset anti-surge valve opening condition.
In a possible embodiment, the target pressure ratio interval is a second candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit;
when the ETV is controlled based on the ETV control method set in the corresponding target pressure ratio interval, the control module is specifically configured to:
determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset slow valve closing speed and a set first valve opening adjusting duration;
and adjusting the current valve opening to the first expected valve opening according to the slow closing speed of the valve.
In a possible embodiment, the target pressure ratio interval is a third candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the third candidate pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
when the ETV is controlled based on the ETV control method set in the corresponding target pressure ratio interval, the control module is specifically configured to:
acquiring the historical valve closing speed of the ETV at the last historical measurement time adjacent to the current measurement time;
obtaining a corresponding second expected valve opening degree based on the historical valve closing speed and the set second valve opening degree adjusting time length;
and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
In a possible embodiment, the target pressure ratio interval is a fourth candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the fourth candidate pressure ratio interval is smaller than the weak critical pressure ratio lower limit;
when the ETV is controlled based on the ETV control method set in the corresponding target pressure ratio interval, the control module is specifically configured to:
adjusting the duration based on the preset normal closing speed of the valve and the set third valve opening to obtain a corresponding third expected valve opening;
and adjusting the current valve opening to a third expected valve opening according to the normal closing speed of the valve.
In a third aspect, an electronic device is proposed, which comprises a processor and a memory, wherein the memory stores program code, which, when executed by the processor, causes the processor to perform the steps of the anti-surge control method of the first aspect.
In a fourth aspect, a computer-readable storage medium is proposed, which comprises program code for causing an electronic device to perform the steps of the anti-surge control method of the first aspect described above, when the program code is run on the electronic device.
In a fifth aspect, a computer program product is provided, which, when invoked by a computer, causes the computer to perform the anti-surge control method steps as described in the first aspect.
The beneficial effect of this application is as follows:
in the anti-surge control method provided by the embodiment of the application, in the closing process of the ETV, the actual pressure ratio of the compressor at the current measurement moment is determined through the pressure sensor, wherein the actual pressure ratio represents: determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor, wherein the current reduced flow is characterized by the ratio of the total outlet pressure to the total inlet pressure at the current measurement moment of the gas compressor: and measuring the gas quantity entering the gas compressor at the current moment, and controlling the ETV based on an ETV control mode set corresponding to the target pressure ratio interval.
By adopting the mode, the ETV is controlled according to the target pressure ratio interval to which the actual pressure ratio belongs and the ETV control mode set corresponding to the target pressure ratio interval, so that the technical defects that in the prior art, the judgment basis for controlling the closing of the ETV at the first running speed or the second running speed is simple and accurate judgment is not directly carried out according to the factor triggering the surge phenomenon is avoided, and the accuracy of the anti-surge control of the gas compressor is improved.
Furthermore, other features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. In the drawings:
FIG. 1 is a schematic diagram illustrating a structure of an intake pipe of an engine according to an embodiment of the present disclosure;
FIG. 2 is a flow chart illustrating an implementation of an anti-surge control method provided by an embodiment of the present application;
FIG. 3 is a logic diagram illustrating a target pressure ratio interval to which an actual pressure ratio belongs according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a combined compressor operation curve provided by the embodiment of the application;
FIG. 5 is a logic diagram illustrating an ETV adjustment provided by an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating a method flow of control logic of an ETV according to an embodiment of the present application;
fig. 7 is a schematic diagram illustrating a specific application scenario based on fig. 2 according to an embodiment of the present application;
FIG. 8 is a schematic diagram illustrating the structure of an anti-surge control device provided by an embodiment of the present application;
fig. 9 schematically illustrates a structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the technical solutions of the present application. All other embodiments obtained by a person skilled in the art without any inventive step based on the embodiments described in the present application are within the scope of the protection of the present application.
It should be noted that "a plurality" is understood as "at least two" in the description of the present application. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. A is connected with B and can represent: a and B are directly connected and A and B are connected through C. In addition, in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.
Before introducing the anti-surge control method provided by the embodiments of the present application, for the convenience of understanding, some terms and phrases referred to in the embodiments of the present application will be briefly described and explained as follows:
surging: it refers to the phenomenon of low-frequency (usually only a few hertz or tens of hertz) and high-amplitude (strong pressure and flow fluctuation) airflow oscillation along the axial direction of the compressor. The low-frequency high-amplitude airflow oscillation is a great excitation force source, can cause the turbo charger to generate strong mechanical vibration and hot end overtemperature, and can cause serious damage to components in a short time, so that the compressor of the turbo charger is prevented from entering a surge region to work in any state.
An electric control throttle valve: namely an air inlet throttle valve, and a butterfly valve is arranged after intercooling for heat management to change the air inlet quantity and improve the exhaust temperature.
Flow reduction: and calculating a dimensionless number for reflecting the air inlet quantity of the supercharger according to the air inlet temperature, pressure, flow, ambient pressure and temperature of the air compressor.
Electronic Control Unit (ECU): the computer is also called as a traveling computer or a vehicle-mounted computer, and is composed of a microcontroller, a memory, an input/output interface, an analog-to-digital converter, a shaping circuit, a driving circuit and other large-scale integrated circuits.
It should be noted that the naming manner of the above terms is only an example, and the embodiments of the present application do not limit the naming manner of the above terms.
Further, based on the above nouns and related term explanations, the following briefly introduces the design ideas of the embodiments of the present application:
when the working condition of the compressor is changed, the surge phenomenon easily occurs, in an actual application scene, if the accelerator is suddenly lost (i.e. the accelerator is loosened) for deceleration after acceleration, the engine can run from a large load area to a small load area, the ETV can be suddenly closed from a small closing degree to a large closing degree, so that the larger air inlet pressure in an air inlet pipeline is blocked by the ETV, the flow rate is greatly reduced, the air inlet pressure flow is changed, even the air inlet pressure flows back to the compressor, the pressure fluctuation of an outlet of the compressor is caused, the surge phenomenon is generated, the fatigue damage of internal parts such as blades of the compressor is accelerated by the surge phenomenon, the existing cracks are rapidly expanded, the compressor and the whole engine are damaged in severe cases, and the service life of the engine is shortened.
In view of this, an embodiment of the present application provides an anti-surge control method, which can alleviate a surge problem caused by thermal management of an engine, and effectively improve a service life of the engine, and specifically includes: during closing of the ETV, the actual pressure ratio of the compressor at the current measurement moment is determined through the pressure sensor, and then the target pressure ratio interval to which the actual pressure ratio belongs is determined based on the candidate pressure ratio interval set corresponding to the current folded flow of the compressor, so that the ETV is controlled based on the ETV control mode set corresponding to the target pressure ratio interval.
In particular, the following description will briefly describe preferred embodiments of the present application with reference to the drawings of the specification, and it should be understood that the preferred embodiments described herein are only for illustrating and explaining the technical solutions provided by the present application, and are not used for limiting the present application, and features in embodiments and embodiments related to the present application may be combined with each other without conflict.
In this embodiment of the application, an execution main body of the anti-surge control method may be a server, an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing basic cloud computing services such as cloud service, a cloud database, cloud computing, a cloud function, cloud storage, network service, cloud communication, middleware service, domain name service, security service, content Delivery Network (CDN), big data, and an artificial intelligence platform.
In particular, in the embodiment of the present application, the server is configured to determine, by means of the pressure sensor, an actual pressure ratio of the compressor at the current measurement time during the closing of the ETV, wherein the actual pressure ratio is indicative of: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment; further, a target pressure ratio interval to which the actual pressure ratio belongs is determined based on a candidate pressure ratio interval set corresponding to the current reduced flow of the compressor, wherein the current reduced flow is characterized in that: the gas quantity entering the gas compressor at the current measuring moment; finally, the ETV is controlled based on the ETV control method set corresponding to the target pressure ratio section.
It should be noted that, in the embodiment of the present application, the server may be an ECU configured with the engine; in addition, referring to fig. 1, it is a schematic structural diagram of an engine intake pipe provided in an embodiment of the present application, where the engine intake pipe includes: the system comprises an Air inlet pipe 1, a supercharger compressor 2, an inter-cooling front pressure 3, an inter-cooling 4, a flowmeter 5 (such as a Mass Air Flow (MAF) meter), an ETV6, an Air inlet temperature/pressure sensor 7, an engine 8, an accelerator opening sensor 9, an Exhaust Gas Recirculation (EGR) valve 10 and a supercharger turbine 11, wherein the supercharger compressor 2 and the supercharger turbine 11 belong to a turbocharger.
The anti-surge control method provided by the exemplary embodiment of the present application is described below with reference to the accompanying drawings in conjunction with the above-described actuator and the above-described engine structure, it is to be noted that the above-described actuator and the above-described engine structure are merely illustrated for the convenience of understanding the spirit and principle of the present application, and the embodiment of the present application is not limited in any way in this respect.
Referring to fig. 2, which is a flowchart illustrating an implementation of an anti-surge control method according to an embodiment of the present application, an execution subject takes an ECU as an example, and a specific implementation flow of the method is as follows:
s201: and in the closing process of the ETV, determining the actual pressure ratio of the compressor at the current measurement moment through a pressure sensor.
Wherein, the actual pressure ratio is characterized: and the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment.
Specifically, when step S201 is executed, that is, during the process of reducing the valve opening of the ETV or closing the ETV, the ECU measures the gas pressure between the inside and the outside of the compressor, that is, the outlet total pressure and the inlet total pressure at any measurement time through a pressure sensor in the turbocharger, and further obtains a corresponding pressure ratio according to the obtained outlet total pressure and the obtained inlet total pressure, so that the actual pressure ratio of the compressor at the current measurement time can be determined through the pressure sensor.
Illustratively, in the closing process of the ETV, the ECU respectively obtains the gas pressure (total outlet pressure and total inlet pressure) between the inner part and the outer part of the compressor at the current measurement moment through a pressure sensor, which are sequentially marked as P 1 And P 2 Furthermore, combining the calculation formula of the preset actual pressure ratio, P can be obtained 1 And P 2 The preset actual pressure ratio is calculated according to the following formula:
wherein δ represents the actual pressure ratio, P 1 Indicating the gas pressure in the compressor, i.e. total outlet pressure, P 2 The pressure outside the compressor, i.e. the total outlet pressure, is indicated.
For example, assume the outlet pressure P described above 1 =58.2Kpa, inlet pressure P 2 If not less than 25.3Kpa, the ECU obtains the outlet air pressure P 1 With inlet air pressure P 2 Then, based on the above-mentioned calculation formula of preset actual pressure ratio, the correspondent actual pressure ratio can be obtained
S202: and determining a target pressure ratio interval to which the actual pressure ratio belongs based on the candidate pressure ratio interval set corresponding to the current reduced flow of the compressor.
Specifically, referring to fig. 3, when step S202 is executed, after determining the actual pressure ratio of the compressor at the current measurement time, the ECU may determine a surge pressure ratio matched with the current reduced flow from a preset compressor operation database, and obtain a corresponding strong critical pressure ratio, a weak critical pressure ratio upper limit, and a weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference included in a preset pressure ratio difference set; then, based on a strong critical pressure ratio, a weak critical pressure ratio upper limit and a weak critical pressure ratio lower limit, obtaining a candidate pressure ratio interval set corresponding to the current reduced flow; finally, from the set of candidate pressure ratio sections, a target pressure ratio section to which the actual pressure ratio belongs is determined.
It should be noted that, under a certain specific reduced flow, if the actual pressure ratio of the compressor reaches or exceeds the surge pressure ratio, a corresponding surge occurs, and the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit under the certain specific reduced flow are all smaller than the corresponding surge pressure ratio, it is not difficult to know that the strong critical pressure ratio is greater than the weak critical pressure ratio upper limit and is greater than the weak critical pressure ratio lower limit, and a critical pressure ratio interval between the strong critical pressure ratio and the weak critical pressure ratio upper limit and a critical pressure ratio interval between the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit can be obtained according to the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit.
For example, referring to fig. 4, a schematic diagram of a combined operating curve of a compressor provided in an embodiment of the present application includes: the surge line a, the strong critical pressure ratio line B, the weak critical pressure ratio upper limit epsilon Hi line C and the weak critical pressure ratio lower limit epsilon Lo line D obtained according to the weak critical pressure ratio hysteresis loop line, it should be noted that all three lines B, C, D are obtained by reserving a certain margin (i.e. pressure ratio difference) according to the surge line a, and specifically, the margin that can be reserved is a little bit less as the surge is more likely to occur according to the calibration of the surge condition of the supercharger.
Further, since the candidate pressure ratio interval set is obtained according to the strong critical pressure ratio, the weak critical pressure ratio upper limit, and the weak critical pressure ratio lower limit, it is easy to see that the candidate pressure ratio interval set at any measurement time includes 4 candidate pressure ratio intervals, that is, a first candidate pressure ratio interval, a second candidate pressure ratio interval, a third candidate pressure ratio interval, and a fourth candidate pressure ratio interval, wherein each pressure ratio included in the first candidate pressure ratio interval is greater than the strong critical pressure ratio, each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit, each pressure ratio included in the third candidate pressure ratio interval is not greater than the weak critical pressure ratio upper limit and is not less than the weak critical pressure ratio lower limit, and each pressure ratio included in the fourth candidate pressure ratio interval is less than the weak critical pressure ratio lower limit.
S203: and controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio section.
Specifically, in executing step S203, after determining the target pressure ratio section to which the actual pressure ratio belongs, the ECU may control the ETV based on the ETV control method set corresponding to the target pressure ratio section.
Since the target pressure ratio section to which the actual pressure ratio belongs may be any one of the 4 candidate pressure ratio sections included in the pressure ratio candidate section set, the ECU may control the ETV based on the ETV control method provided for the target pressure ratio section in 4 cases as follows:
case 1: if the target pressure ratio interval is the first candidate pressure ratio interval, the current valve opening of the ETV can be determined through the valve opening sensor, and therefore the current valve opening is adjusted to be the preset fixed valve opening.
The preset fixed valve opening degree meets a preset anti-surge valve opening degree condition, which is to be noted that the preset anti-surge valve opening degree condition includes, but is not limited to, other surge enabling conditions, for example, the boost pressure is greater than a set value, the intake air flow is less than the set value, the temperature upstream of a Selective Catalytic Reduction (SCR) is less than the set value, the required torque is reduced, and the requirement includes the vehicle condition, for example, in a lower gear.
Therefore, based on the above manner, it can be avoided that surge is likely to occur when the current valve opening is small, so that the current valve opening is adjusted to be a larger valve opening (i.e. a fixed valve opening, for example, 60%), thereby avoiding surge occurring due to too fast ETV closing.
Case 2: if the target pressure ratio interval is the second candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset valve slow closing speed and a set first valve opening adjusting duration, so that the current valve opening is adjusted to the first expected valve opening according to the valve slow closing speed.
It should be noted that the preset slow closing speed of the valve and the set adjustment duration of the first valve opening are both obtained empirically and are mainly used to ensure that the compressor does not surge during the closing process.
Optionally, when the ECU determines that the target pressure ratio interval is the second candidate pressure ratio interval and needs to adjust the current valve opening to the first expected valve opening according to the slow closing speed of the valve, there may be a certain time delay for state switching, for example, T1.
Case 3: if the target pressure ratio interval is a third candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and acquiring the historical valve closing speed of the ETV at the last historical measurement time adjacent to the current measurement time; then, obtaining a corresponding second expected valve opening degree based on the historical valve closing speed and the set second valve opening degree adjusting time length; and finally, adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
It should be noted that the set adjustment time length of the opening of the second valve is obtained empirically and is mainly used to ensure that no surge occurs during the closing process of the compressor.
Case 4: if the target pressure ratio interval is the fourth candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding third expected valve opening based on the preset normal valve closing speed and the set third valve opening adjusting duration, so that the current valve opening is adjusted to the third expected valve opening according to the normal valve closing speed.
It should be noted that the preset normal closing speed of the valve and the set adjustment duration of the opening of the third valve are both obtained empirically and are mainly used to ensure that the compressor does not surge during the closing process.
Optionally, when determining that the target pressure ratio interval is the fourth candidate pressure ratio interval, the ECU needs to adjust the current valve opening to the third expected valve opening according to the normal valve closing speed, and there may be a certain time delay for state switching, for example, T2.
In addition, it should be noted that the set adjustment time length of the first valve opening, the set adjustment time length of the second valve opening, and the set adjustment time length of the third valve opening may be the same or different, and in the embodiment of the present application, the values thereof are not limited at all.
Based on the above, the generation of surge is avoided while the influence on the thermal management is minimized by changing the control speed of the ETV and setting the valve opening (the fixed valve opening and the expected valve opening) according to the degree of surge (i.e., the possibility of surge generation).
In a possible implementation manner, when step S203 is executed, referring to fig. 5, which is a logic diagram of adjusting the ETV provided in the embodiment of the present application, facSrgB _ CUR, facSrgC _ CUR, facSrgD _ CUR are curves calibrated based on B, C, D, drtvadecno _ MAP is a preset normal valve closing speed, drTvaDecSlow _ MAP is a preset slow valve closing speed, rB is a preset fixed valve opening, drtvinc _ MAP is an opening rate of the ETV, rgovvarraw is a valve opening of the non-interfered ETV, that is, a current valve opening, rgovva is a corrected ETV valve opening, and rB is a preset fixed valve opening, respectively.
Further, when the ECU executes the anti-surge control method, the current reduced flow obtains a weak critical pressure ratio upper limit epsilon Hi through facSrgC _ CUR, obtains a weak critical pressure ratio lower limit epsilon Lo through facSrgD _ CUR, if the actual pressure ratio epsilon exceeds epsilon Hi, the closing speed of the ETV needs to be adjusted to DrTvaDecSlow _ MAP, and the state switching has t1 delay; if the actual pressure ratio epsilon is lower than epsilon Lo, the closing speed of the ETV needs to be adjusted to DrTvaDecNor _ MAP, and the state switching has t2 delay; if the actual pressure ratio ε is between ε Hi and ε Lo, then the closing rate of the ETV remains at the last state closing rate; and if the actual pressure ratio epsilon is larger than the strong critical pressure ratio epsilon B and meets other surge enabling conditions, the current valve opening of the ETV needs to be adjusted to be a preset fixed valve opening, so that the current valve opening of the ETV is adjusted to be the ETV opening rGovTva after speed correction, wherein dpIntP is the change rate of the intake pressure, n is the rotating speed, epsilon is the pressure ratio, and Ac is the converted flow.
Further, referring to fig. 6, which is a schematic flow chart of a method of a control logic of an ETV according to an embodiment of the present application, the method includes the following specific steps:
s601: and calculating the actual pressure ratio.
S602: if the actual pressure ratio is larger than the upper limit of the weak critical pressure ratio, the operation goes to S603; if not, the process proceeds to S607.
S603: if the actual pressure ratio is larger than the strong critical pressure ratio, executing S604, and after adjusting the current valve opening to a preset fixed valve opening, turning to S602; if not, the process proceeds to S605.
S604: and adjusting the current valve opening to a preset fixed valve opening.
S605: and adjusting the current valve opening to the first expected valve opening according to the slow closing speed of the valve.
S606: the control of the ETV is ended.
S607: if the actual pressure ratio is smaller than the lower limit of the weak critical pressure ratio, the operation goes to step S608, and after the current valve opening is adjusted to the third expected valve opening, the operation goes to step S606; if not, the process proceeds to S609, and after the current valve opening is adjusted to the second expected valve opening, the process proceeds to S606.
S608: and adjusting the current valve opening to a third expected valve opening according to the normal closing speed of the valve.
S609: and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
Therefore, referring to fig. 7, which is a schematic diagram of a specific application scenario of the anti-surge control provided in the embodiment of the present application, the ECU determines, through the pressure sensor sensor.pr, that the current measurement time (e.g., 2022.09.28 14: the method comprises the steps that the ratio of outlet total pressure to inlet total pressure of the compressor at the current measurement time is determined, and then a target pressure ratio interval pre.rat.Ran3 to which an actual pressure ratio 1.5 belongs is determined based on a candidate pressure ratio interval set Can.Pre.set corresponding to the current reduced flow of the compressor, so that ETV is controlled based on an ETV control mode Con.Mode3 set corresponding to the target pressure ratio interval.
In summary, in the anti-surge control method provided in the embodiment of the present application, in the closing process of the ETV, the actual pressure ratio of the compressor at the current measurement time is determined by the pressure sensor, where the actual pressure ratio represents: determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor, wherein the current reduced flow is characterized by the ratio of the total outlet pressure to the total inlet pressure at the current measurement moment of the gas compressor: and measuring the gas quantity entering the gas compressor at the current moment, and controlling the ETV based on an ETV control mode set corresponding to the target pressure ratio interval.
By adopting the mode, the ETV is controlled according to the target pressure ratio interval to which the actual pressure ratio belongs and the ETV control mode set corresponding to the target pressure ratio interval, so that the technical defects that in the prior art, the judgment basis for controlling the closing of the ETV at the first running speed or the second running speed is simple and accurate judgment is not directly carried out according to the factor triggering the surge phenomenon is avoided, and the accuracy of the anti-surge control of the gas compressor is improved.
Further, based on the same technical concept, the embodiment of the present application provides an anti-surge control device, which is used to implement the above method flow of the embodiment of the present application.
Referring to fig. 8, the anti-surge control apparatus includes: an obtaining module 801, a determining module 802, and a control module 803, wherein:
an obtaining module 801, configured to determine, through a pressure sensor, an actual pressure ratio of the compressor at a current measurement time in a closing process of the electronically controlled throttle ETV; wherein, the actual pressure ratio is characterized: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment;
a determining module 802, configured to determine a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to a current reduced flow of the gas compressor; wherein, the current reduced flow is characterized by: measuring the gas quantity entering the compressor at the current moment;
and a control module 803, configured to control the ETV based on the ETV control manner set in the corresponding target pressure ratio interval.
In a possible embodiment, when determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to a current reduced flow of the compressor, the determining module 802 is specifically configured to:
determining a surge pressure ratio matched with the current reduced flow from a preset gas compressor operation database, and obtaining a corresponding strong critical pressure ratio, a corresponding weak critical pressure ratio upper limit and a corresponding weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
obtaining a candidate pressure ratio interval set corresponding to the current reduced flow based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit;
and determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set.
In a possible embodiment, the target pressure ratio interval is a first candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the first candidate pressure ratio interval is greater than the strong critical pressure ratio;
when the ETV is controlled based on the ETV control manner set in the corresponding target pressure ratio section, the control module 803 is specifically configured to:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to a preset fixed valve opening; wherein, the fixed valve opening satisfies the preset anti-surge valve opening condition.
In a possible embodiment, the target pressure ratio interval is a second candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit;
when the ETV is controlled based on the ETV control manner set in the corresponding target pressure ratio section, the control module 803 is specifically configured to:
determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset slow valve closing speed and a set first valve opening adjusting duration;
and adjusting the current valve opening to be the first expected valve opening according to the slow closing speed of the valve.
In a possible embodiment, the target pressure ratio interval is a third candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the third candidate pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
when the ETV is controlled based on the ETV control manner set in the corresponding target pressure ratio section, the control module 803 is specifically configured to:
acquiring the historical valve closing speed of the ETV at the last historical measurement time adjacent to the current measurement time;
obtaining a corresponding second expected valve opening degree based on the historical valve closing speed and the set second valve opening degree adjusting time length;
and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
In a possible embodiment, the target pressure ratio interval is a fourth candidate pressure ratio interval included in the pressure ratio candidate interval set, and each pressure ratio included in the fourth candidate pressure ratio interval is smaller than the weak critical pressure ratio lower limit;
when the ETV is controlled based on the ETV control manner set in the corresponding target pressure ratio section, the control module 803 is specifically configured to:
obtaining a corresponding third expected valve opening degree based on the preset normal valve closing speed and the set third valve opening degree adjusting duration;
and adjusting the current valve opening to a third expected valve opening according to the normal closing speed of the valve.
Based on the same technical concept, the embodiment of the application also provides electronic equipment, and the electronic equipment can realize the flow of the anti-surge control method provided by the embodiment of the application. In one embodiment, the electronic device may be a server, a terminal device, or other electronic device. As shown in fig. 9, the electronic device may include:
at least one processor 901 and a memory 902 connected to the at least one processor 901, in this embodiment, a specific connection medium between the processor 901 and the memory 902 is not limited in this application, and fig. 9 illustrates an example where the processor 901 and the memory 902 are connected through a bus 900. The bus 900 is shown in fig. 9 by a thick line, and the connection between other components is merely illustrative and not limited thereto. The bus 900 may be divided into an address bus, a data bus, a control bus, etc., and is shown with only one thick line in fig. 9 for ease of illustration, but does not represent only one bus or type of bus. Alternatively, the processor 901 may also be referred to as a controller, without limitation to name a few.
In the embodiment of the present application, the memory 902 stores instructions executable by the at least one processor 901, and the at least one processor 901 can execute one of the anti-surge control methods discussed above by executing the instructions stored in the memory 902. The processor 901 may implement the functions of the respective modules in the apparatus shown in fig. 8.
The processor 901 is a control center of the apparatus, and may connect various parts of the entire control device by using various interfaces and lines, and perform various functions and process data of the apparatus by executing or executing instructions stored in the memory 902 and calling data stored in the memory 902, thereby performing overall monitoring of the apparatus.
In one possible design, processor 901 may include one or more processing units and processor 901 may integrate an application processor that handles primarily the operating system, user interfaces, applications, etc., and a modem processor that handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 901. In some embodiments, the processor 901 and the memory 902 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.
The processor 901 may be a general-purpose processor, such as a CPU, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like, that may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of an anti-surge control method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
The processor 901 is programmed to solidify the code corresponding to an anti-surge control method described in the foregoing embodiments into the chip, so that the chip can execute the steps of an anti-surge control method of the embodiment shown in fig. 2 when running. How to program the processor 901 is well known to those skilled in the art and will not be described herein.
Based on the same inventive concept, the present application also provides a storage medium storing computer instructions, which when executed on a computer, cause the computer to execute an anti-surge control method as discussed above.
In some possible embodiments, the present application provides that the various aspects of an anti-surge control method can also be realized in the form of a program product comprising program code for causing the control apparatus to perform the steps of an anti-surge control method according to various exemplary embodiments of the present application described above in this specification when the program product is run on a device.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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.
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.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An anti-surge control method, comprising:
in the closing process of the ETV, determining the actual pressure ratio of the compressor at the current measuring moment through a pressure sensor; wherein the actual pressure ratio characterizes: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment;
determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor; wherein the current reduced flow is characterized by: the gas quantity entering the gas compressor at the current measuring moment;
and controlling the ETV based on an ETV control mode set corresponding to the target pressure ratio interval.
2. The method of claim 1, wherein the determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to a current reduced flow rate of the compressor comprises:
determining a surge pressure ratio matched with the current reduced flow from a preset gas compressor operation database, and obtaining a corresponding strong critical pressure ratio, a corresponding weak critical pressure ratio upper limit and a corresponding weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
obtaining a candidate pressure ratio interval set corresponding to the current reduced flow based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit;
and determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set.
3. The method of claim 2, wherein the target pressure ratio interval is a first candidate pressure ratio interval included in the set of pressure ratio candidate intervals, each pressure ratio included in the first candidate pressure ratio interval being greater than the strong critical pressure ratio;
controlling the ETV based on the ETV control manner set corresponding to the target pressure ratio section, including:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to a preset fixed valve opening; and the opening of the fixed valve meets the preset anti-surge valve opening condition.
4. The method of claim 2, wherein the target pressure ratio interval is a second candidate pressure ratio interval included in the set of pressure ratio candidate intervals, and each of the second candidate pressure ratio intervals includes a pressure ratio that is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit;
then, the controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval includes:
determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset slow valve closing speed and a set first valve opening adjusting duration;
and adjusting the current valve opening to the first expected valve opening according to the slow closing speed of the valve.
5. The method of claim 4, wherein the target pressure ratio interval is a third candidate pressure ratio interval included in the set of pressure ratio candidate intervals, and each pressure ratio included in the third candidate pressure ratio interval is not greater than the upper weak critical pressure ratio limit and not less than the lower weak critical pressure ratio limit;
controlling the ETV based on the ETV control manner set corresponding to the target pressure ratio section, including:
acquiring the historical valve closing speed of the ETV at the last historical measurement time adjacent to the current measurement time;
obtaining a corresponding second expected valve opening degree based on the historical valve closing speed and the set second valve opening degree adjusting time length;
and adjusting the current valve opening to the second expected valve opening according to the historical valve closing speed.
6. The method of claim 4, wherein the target pressure ratio interval is a fourth candidate pressure ratio interval included in the set of pressure ratio candidate intervals, each pressure ratio included in the fourth candidate pressure ratio interval being less than the lower weak critical pressure ratio limit;
controlling the ETV based on the ETV control manner set corresponding to the target pressure ratio section, including:
adjusting the duration based on the preset normal closing speed of the valve and the set third valve opening to obtain a corresponding third expected valve opening;
and adjusting the current valve opening to the third expected valve opening according to the normal closing speed of the valve.
7. An anti-surge control device is characterized by comprising
The acquisition module is used for determining the actual pressure ratio of the compressor at the current measurement moment in the closing process of the electric control throttle ETV; wherein the actual pressure ratio characterizes: the ratio of the total outlet pressure to the total inlet pressure of the compressor at the current measurement moment;
the determining module is used for determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current reduced flow of the gas compressor; wherein the current reduced flow is characterized by: the gas quantity entering the gas compressor at the current measuring moment;
and the control module is used for controlling the ETV based on an ETV control mode set corresponding to the target pressure ratio interval.
8. The apparatus according to claim 7, wherein, when determining the target pressure ratio interval to which the actual pressure ratio belongs based on the candidate pressure ratio interval set corresponding to the current reduced flow rate of the compressor, the determining module is specifically configured to:
determining a surge pressure ratio matched with the current reduced flow from a preset gas compressor operation database, and obtaining a corresponding strong critical pressure ratio, a corresponding weak critical pressure ratio upper limit and a corresponding weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
obtaining a candidate pressure ratio interval set corresponding to the current reduced flow based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit;
and determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-6 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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