CN116255260A

CN116255260A - Anti-surge control method and device for engine, storage medium and electronic equipment

Info

Publication number: CN116255260A
Application number: CN202310273399.XA
Authority: CN
Inventors: 梁帅帅; 代子阳; 梁恒山; 史彦晓
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-06-13
Anticipated expiration: 2043-03-16
Also published as: CN116255260B

Abstract

The application provides an anti-surge control method and device of an engine, a storage medium and electronic equipment. The control method comprises the following steps: acquiring working condition information of a thermal management system in a preset time interval, wherein the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve; under the condition that the working condition information indicates that the current moment of the engine is in a surge state, determining the accumulated duration of the engine in the surge state in a preset time interval, wherein the current moment is positioned in the preset time interval; and carrying out iterative correction on the minimum opening and closing speed of the air inlet throttle valve, and outputting a control signal after each correction in the iterative correction until the correction condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed. The method well balances the problems of engine thermal management and surge in the thermal management system, and solves the problem of engine surge in the prior art.

Description

Anti-surge control method and device for engine, storage medium and electronic equipment

Technical Field

The present application relates to the technical field of engines, and in particular, to an anti-surge control method for an engine, an anti-surge control device for an engine, a storage medium, and an electronic device.

Background

In the technical field of engines, it is important to improve the service performance of the engine. In some practical application scenarios, the engine is usually connected with the air inlet throttle valve, and when the engine suddenly encounters a condition of running from a large load area to a small load area, the air inlet throttle valve is correspondingly closed from the small closing degree to the large closing degree, so that the larger air inlet pressure in the air inlet pipeline is blocked by the air inlet throttle valve, the circulation rate in the air inlet pipeline is greatly reduced, the air inlet pressure flow is changed, even the air inlet pressure flows back to the air compressor, the air compressor outlet pressure fluctuation is caused, the surge is generated, the air compressor and the whole engine are damaged, and the service life of the engine is greatly reduced.

Currently, in the prior art, an engine anti-surge control device and method are provided, when the closing degree of an intake throttle valve is smaller than a certain preset threshold value, the intake throttle valve is closed to execute a second operation speed, namely, a speed value obtained after consideration is balanced according to the regeneration temperature control of a particle trap (DPF) and the control stability of the intake throttle valve, and if the closing degree of the intake throttle valve is larger, the intake throttle valve is closed to execute a normal speed. According to the scheme, the engine is prevented from surging according to the threshold value of the opening of the air inlet throttle valve, whether surging occurs or not cannot be accurately identified, and the heat management is unfavorable.

Disclosure of Invention

The main object of the present application is to provide an anti-surge control method of an engine, an anti-surge control device of an engine, a storage medium and an electronic device, so as to at least solve the problem of surge caused by thermal management of the engine in the prior art.

To achieve the above object, according to one aspect of the present application, there is provided an anti-surge control method of an engine, including: acquiring working condition information of a thermal management system in a preset time interval, wherein the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve; under the condition that the working condition information indicates that the engine is in a surge state at the current moment, determining the accumulated duration of the engine in the surge state in a preset time interval, wherein the current moment is positioned in the preset time interval; performing iterative correction on the minimum opening and the closing speed of the air inlet throttle valve, and outputting a control signal after each correction in the iterative correction until the correction stopping condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed, and the correction stopping condition comprises at least one of the following: the engine is not in a surge condition and the number of corrections reaches a preset number of times, wherein each correction in the iterative correction comprises: judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold value or smaller than a second threshold value; under the condition that the ratio is larger than a first threshold value, the minimum opening is positively corrected according to a first correction coefficient, and the closing speed is negatively corrected according to a second correction coefficient; and when the ratio is smaller than the second threshold value, carrying out negative correction on the minimum opening according to the first correction coefficient, and carrying out positive correction on the closing speed according to the second correction coefficient.

Optionally, determining whether the ratio of the accumulated duration to the total duration of the preset time interval is greater than a first threshold or less than a second threshold includes: judging whether the ratio is larger than a first threshold value; and judging whether the ratio is smaller than a second threshold value or not under the condition that the ratio is smaller than or equal to the first threshold value.

Optionally, each correction further comprises: judging whether the corrected minimum opening degree meets a first preset range or not to obtain a first judgment result; judging whether the corrected closing speed meets a second preset range or not to obtain a second judging result; if the first judgment result is negative and the minimum opening is the first corrected opening, updating the corrected minimum opening to be the maximum value of a first preset range, wherein the first corrected opening is the minimum opening for positive correction; if the first judgment result is negative and the minimum opening is the second corrected opening, updating the corrected minimum opening to the minimum value of the first preset range, wherein the second corrected opening is the minimum opening for negative correction; if the second judgment result is negative and the closing speed is the first correction speed, updating the corrected closing speed to the minimum value of the second preset range, wherein the first correction speed is the closing speed for negative correction; and if the second judgment result is negative and the minimum opening degree is the second correction speed, updating the corrected closing speed to the maximum value of the first preset range, wherein the second correction speed is the closing speed for positive correction.

Optionally, the thermal management system further includes a compressor, the working condition information includes a first intake flow rate and a first pressure ratio of the compressor at a current moment, and the control method further includes: judging whether the engine is in a surge state at the current moment or not according to at least the first air inlet flow, the first pressure ratio and the surge threshold set, wherein a plurality of surge thresholds in the surge threshold set are expressed as a plurality of preset pressure ratios corresponding to a plurality of preset air inlet flows one by one, the plurality of preset air inlet flows comprise the first air inlet flow, and the plurality of preset pressure ratios comprise the first pressure ratio.

Optionally, determining whether the engine is in a surge state at the current time based at least on the first intake air flow, the first pressure ratio, and the set of surge thresholds includes one of: judging whether the first pressure ratio is larger than a target preset pressure ratio, wherein the target preset pressure ratio is a preset pressure ratio corresponding to the first air inlet flow in a plurality of preset pressure ratios, and if the first pressure ratio is larger than the target preset pressure ratio, a first judgment result is obtained and is used for determining that the engine is in a surge state at the current moment; judging whether the first air inlet flow is larger than a target preset air inlet flow or not, wherein the target preset air inlet flow is a preset air inlet flow corresponding to a first pressure ratio in a plurality of preset air inlet flows, and obtaining a second judging result which is used for determining that the engine is in a surge state at the current moment under the condition that the first air inlet flow is larger than the target preset air inlet flow.

Optionally, the working condition information further includes a smoke limit oil amount and a circulating oil supply amount corresponding to the thermal management system, and the method further includes determining whether the engine is in a surge state at the current moment at least according to the first intake air flow, the first pressure ratio and the surge threshold set, and further includes: calculating the difference between the smoke limit oil quantity and the circulating oil supply quantity to obtain a first difference; and judging whether the first difference value is smaller than a transient degree threshold value or not, wherein the transient degree threshold value is expressed as the minimum transient degree when the engine does not surge, and under the condition that the first difference value is smaller than the transient degree threshold value, a third judgment result is obtained and is used for determining that the engine is in a surge state at the current moment.

Optionally, the working condition information further includes a first accelerator opening of the engine at the current moment, and judges whether the engine is in a surge state at the current moment at least according to the first intake air flow, the first pressure ratio and the surge threshold set, and the working condition information further includes: acquiring a second accelerator opening of the engine at a preset time, wherein the preset time is before the current time; determining a reduction gradient according to the first accelerator opening and the second accelerator opening; judging whether the decreasing gradient is larger than a gradient threshold value, wherein a fourth judging result is obtained under the condition that the decreasing gradient is larger than the gradient threshold value, and the fourth judging result is used for determining that the engine is in a surge state at the current moment.

Optionally, the starting time of the preset time interval is the starting time of the engine, and the ending time of the preset time interval is the current time.

Optionally, performing iterative correction on the minimum opening and the closing speed, and outputting a control signal after each correction in the iterative correction until the correction stopping condition is met, including: iterative correction is carried out on the minimum opening and the closing speed, and a control signal is output after each correction, so that the air inlet throttle valve executes the corrected minimum opening and the corrected closing speed; after each correction, working condition information of the engine thermal management system in a preset time interval is obtained, wherein the ending time of the preset time interval is updated current time; when the working condition information indicates that the engine is in a surge state at the updated current moment and the correction times do not reach the preset times, continuing iterative correction; and stopping iterative correction when the working condition information indicates that the stopping correction condition is met.

In order to achieve the above object, according to one aspect of the present application, there is provided an anti-surge control apparatus of an engine, comprising: the acquisition module is used for acquiring working condition information of the thermal management system in a preset time interval, the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve; the determining module is used for determining the accumulated duration of the engine in the surge state in a preset time interval under the condition that the working condition information indicates that the engine is in the surge state at the current moment, wherein the current moment is positioned in the preset time interval; the correction module is used for carrying out iterative correction on the minimum opening degree and the closing speed of the air inlet throttle valve, outputting a control signal after each correction in the iterative correction until the correction stopping condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening degree and the corrected closing speed, and the correction stopping condition comprises at least one of the following conditions: the engine is not in a surge condition and the number of corrections reaches a preset number of times, wherein each correction in the iterative correction comprises: the judging module is used for judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold value or smaller than a second threshold value; the first correction submodule is used for carrying out positive correction on the minimum opening according to the first correction coefficient and carrying out negative correction on the closing speed according to the second correction coefficient when the ratio is larger than a first threshold value; and the second correction submodule is used for carrying out negative correction on the minimum opening according to the first correction coefficient and carrying out positive correction on the closing speed according to the second correction coefficient under the condition that the ratio is smaller than the second threshold value.

According to another aspect of the present application, there is provided a computer readable storage medium, the computer readable storage medium including a stored program, wherein the apparatus in which the computer readable storage medium is controlled to execute the above-described anti-surge control method of an engine when the program runs.

According to still another aspect of the present application, there is provided an electronic apparatus including: the engine comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising an anti-surge control method for executing the engine.

By means of the technical scheme, whether an engine in the thermal management system is in a surge state at the current moment or not is judged through obtaining working condition information of the thermal management system in a preset time interval, under the condition that the engine is in the surge state, the accumulated time length of the engine in the surge state in the preset time interval is determined, further, the minimum opening and closing speed of an air inlet throttle valve connected with the engine are subjected to iterative correction, a control signal is output after each correction until a condition of stopping correction is met, in each correction, firstly, the ratio of the accumulated time length to the total time length of the preset time interval is determined, and under the condition that the ratio is larger than a first threshold value, namely, the engine is in the surge state for a longer time, the risk is higher, positive correction is carried out on the minimum opening of the air inlet throttle valve through the first correction coefficient, so that the opening of the air inlet throttle valve is increased, and the minimum opening of the air inlet throttle valve is subjected to negative correction through the second correction coefficient, so that the closing speed of the air inlet throttle valve is reduced, and the purposes of reducing surge and protecting a supercharger are achieved; and when the ratio is smaller than the second threshold value, that is, the engine is in a surge state for a short time, it can be determined that the surge strength is weak and the risk is low, at this time, the minimum opening of the air intake throttle valve is negatively corrected by adopting the first correction coefficient to reduce the opening of the air intake throttle valve, and the minimum opening of the air intake throttle valve is positively corrected by adopting the second correction coefficient to increase the closing speed of the air intake throttle valve, so that certain thermal management capability can be recovered. Therefore, through the iterative correction, the correction direction of the minimum opening degree of the air inlet throttle valve and the correction direction of the closing speed can be determined by evaluating the surge degree in the preset time interval, so that the problem of surge caused by engine thermal management in the prior art is solved, and the aim of better balancing the engine thermal management in the thermal management system is fulfilled.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 shows a hardware block diagram of a mobile terminal performing an anti-surge control method of an engine according to an embodiment of the present application;

FIG. 2 shows a flow diagram of an anti-surge control method for an engine provided in accordance with a first embodiment of the present application;

FIG. 3 is a detailed flow chart of each correction in an anti-surge control method of an engine according to a first embodiment of the present application;

FIG. 4 shows a flow diagram of an anti-surge control method for an engine provided in accordance with a second embodiment of the present application;

FIG. 5 is a detailed flow chart illustrating a method for anti-surge control of an engine according to a second embodiment of the present application for determining whether the engine is in a surge condition at a current time;

fig. 6 shows a further detailed flowchart of step S2011 in an anti-surge control method of an engine according to a second embodiment of the present application;

FIG. 7 illustrates a particular flow diagram of an anti-surge control method for an engine provided in accordance with a third embodiment of the present application;

fig. 8 shows a block diagram of an anti-surge control apparatus for an engine according to an embodiment of the present application.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terms related to the embodiments of the present application:

the thermal management system in the scheme at least comprises an engine, an air inlet throttle valve connected with the engine and a gas compressor.

Surging, namely the rotation speed of a working impeller of the air compressor in the thermal management system is fixed, and when the inlet air flow entering the air compressor is reduced to a certain degree, gas separation occurs at the back of the impeller of the air compressor, and the phenomenon of strong vibration of air flow is surging.

Intake throttle valve (TV valve), which is exemplarily applied to a diesel engine, the device for the diesel engine to change intake air amount and raise exhaust temperature by installing a butterfly valve after intercooling for heat management is the intake throttle valve.

Pressure ratio, the ratio of total pressure at the outlet of the compressor to total pressure at the inlet.

And (3) reducing the flow, and calculating the dimensionless number of the air inlet of the reaction supercharger through the air inlet temperature, pressure, flow, ambient pressure and temperature of the air compressor.

As described in the background art, in the prior art, when the closing degree of the air intake throttle valve is smaller than a certain preset threshold, the closing of the air intake throttle valve executes the second operation speed, that is, the speed value obtained after consideration is compromised according to the regeneration temperature control of the particle catcher (DPF) and the control stability of the air intake throttle valve, and if the closing degree of the air intake throttle valve is larger, the closing of the air intake throttle valve executes the normal speed, in the above scheme, the surge of the engine is prevented according to the opening degree threshold of the air intake throttle valve, whether the surge occurs or not can not be accurately identified, and for the disadvantage of thermal management, in order to solve the surge problem caused by the thermal management of the engine in the prior art, the embodiments of the application provide an anti-surge control method, an anti-surge control device of the engine, a storage medium and an electronic device.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal of an anti-surge control method of an engine according to an embodiment of the present invention. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a display method of device information in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-described method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, an anti-surge control method of an engine operating on a mobile terminal, a computer terminal, or a similar computing device is provided, it is to be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.

FIG. 2 is a flow chart of an anti-surge control method for an engine according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

step S201, working condition information of a thermal management system in a preset time interval is obtained, the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve;

specifically, the preset time interval is a minimum time interval when the self-heating management system starts to start, and the engine surge is likely to occur, the working condition information is real-time working condition information of the thermal management system in the preset time interval, and preset working condition information of the thermal management system in the preset time interval, the preset working condition information represents working condition information of the thermal management system in an ideal working state, wherein the ideal working state at least comprises that the engine in the thermal management system does not surge. Specifically, the above-described thermal management system includes an engine and an intake throttle valve, and the intake throttle valve and the engine are connected in a relationship for controlling an intake air amount of the engine.

Step S202, under the condition that the working condition information indicates that the engine is in a surge state at the current moment, determining the accumulated duration of the engine in the surge state in a preset time interval, wherein the current moment is positioned in the preset time interval;

specifically, the working condition information comprises real-time working condition information of the thermal management system in the preset time interval and preset working condition information of the thermal management system in the preset time interval, so that the working condition information of the thermal management system at the current moment in the preset time interval can be obtained by comparing the real-time working condition information with the preset working condition information, the condition that the engine is in a surge state according to the working condition information at the current moment can be further obtained, and the accumulated time length of the engine in the surge state in the preset time interval can be further determined.

And step S203, performing iterative correction on the minimum opening and closing speed of the air inlet throttle valve, and outputting a control signal after each correction in the iterative correction until the correction stopping condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed.

In particular, the minimum opening and closing speed of the intake throttle can be used to regulate the engine so as to avoid that the engine is always in a surge condition. And in order to make the engine deviate from the surge state, the minimum opening degree and the closing speed of the air inlet throttle valve are iteratively corrected under the condition that the working condition information indicates that the engine is in the surge state at the current moment. And under the condition that the working condition information indicates that the engine is in a surge state at the current moment, at least one stop correction condition that the engine is in the surge state and the correction times reach the preset times is preset, so that the engine is regulated through the minimum opening degree and the closing speed after the iterative correction is finished after the iterative correction is stopped.

Wherein each correction in the iterative correction includes: and judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold value or smaller than a second threshold value.

Specifically, in the first correction process, firstly, a ratio of the accumulated time length of the engine in the surge state in the preset time interval to the total time length of the preset time interval and a first threshold value are obtained, wherein the first threshold value is smaller than the preset time interval, the first threshold value is expressed as the maximum time length of the engine in the surge state in the preset time interval, and according to whether the ratio of the accumulated time length of the engine in the surge state in the preset time interval to the total time length of the preset time interval is larger than the first threshold value or not, and further, the minimum opening degree and the closing speed of the air inlet throttle valve are corrected correspondingly according to different judging results.

For example, after the first correction, the minimum opening and closing speed after the correction may be stored in an Electronic Control Unit (ECU) of the engine, the working condition information of the engine at the current time after the first correction may be further obtained, and according to whether the working condition information indicates that the engine is in a surge state at the current time, in the case that the engine is still in a surge state, the minimum opening and closing speed of the air intake throttle valve may be corrected for the second time, and the correction may be sequentially circulated until the correction condition is satisfied, so that the air intake throttle valve is executed at the minimum opening and closing speed corresponding to the minimum opening and closing speed stored in the ECU when the correction condition is satisfied.

For example, a preset number of iterative corrections, which is a minimum number of iterations that can cause the engine to deviate from a surge state, is preset so that the engine deviates from the surge state after the minimum opening and closing speed of the intake throttle valve are iteratively corrected to the preset number of times.

Iterative correction is carried out on the minimum opening and the closing speed of the air inlet throttle valve, the correction is stopped until the correction times reach the preset times, and a control signal is output, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed, and the method comprises the following steps: performing iterative correction on the minimum opening and the closing speed, and outputting a control signal after each correction in the iterative correction until a stop correction condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed, and the stop correction condition comprises at least one of the following: the engine is not in a surge condition and the number of corrections reaches a preset number.

Optionally, the preset number of times may be the maximum number of times of correcting the minimum opening and closing speed of the air intake throttle valve in the thermal management system, and after the corrected number of times reaches the preset number of times, controlling the minimum opening and closing speed of the air intake throttle valve to be unchanged, or locking the minimum opening and closing speed of the air intake throttle valve; accordingly, if the number of corrections does not reach the preset number of corrections, the minimum opening and closing speed of the air intake throttle valve need to be iteratively corrected according to the working condition information of the thermal management system in the preset time interval, and further if the working condition information indicates that the engine is in a surge state at the current moment.

Specifically, in order to determine whether to stop the correction according to the new minimum opening and the new closing speed after each correction of the minimum opening and the closing speed of the intake throttle valve, a control signal is output after each correction so that the obtained corrected minimum opening and the corrected closing speed can be executed according to the control signal after each correction, and further whether the engine is in a surge state is determined according to the corrected minimum opening and the corrected closing speed; or directly accumulating the times of the output control signals, stopping correction under the condition that the accumulated times of the output control signals reach the preset times, and judging whether the engine is in a surge state according to the minimum opening and the closing speed after the correction reaches the preset times.

Under the condition that the ratio is larger than a first threshold value, the minimum opening is positively corrected according to a first correction coefficient, and the closing speed is negatively corrected according to a second correction coefficient;

specifically, in each correction process, when the ratio of the cumulative duration of the engine in the surge state in the preset time interval to the total duration of the preset time interval is greater than a first threshold value, the minimum opening degree of the air inlet throttle valve connected with the engine is excessively large, and the closing speed of the air inlet throttle valve is excessively slow, so that the minimum opening degree is corrected by adopting a first correction coefficient, and the closing speed is corrected by adopting a second correction coefficient.

The first correction coefficient and the second correction coefficient can be calibrated through actual whole vehicle strategy verification and used for different application scenes, so that surge phenomena in different application scenes are effectively reduced. Illustratively, in the case where the minimum opening degree range of the intake throttle valve is 15% to 100%, the above-described first correction coefficient may be 1%; for example, in the case where the closing speed of the intake throttle valve is in the range of 4%/s to 50%/s, the above-described second correction coefficient may be 2%/s.

And when the ratio is smaller than the second threshold value, carrying out negative correction on the minimum opening according to the first correction coefficient, and carrying out positive correction on the closing speed according to the second correction coefficient.

Specifically, when the ratio of the cumulative duration of the engine in the surge condition in the preset time interval to the total duration of the preset time interval is smaller than the second threshold, it is indicated that the minimum opening degree of the intake throttle valve connected with the engine is too small, and the closing speed of the intake throttle valve is too fast, that is, the minimum opening degree is not located in the first opening degree interval, and the closing speed is not located in the first speed interval, so that the first correction coefficient is used for correcting the minimum opening degree, and the second correction coefficient is used for correcting the closing speed.

According to the embodiment, whether an engine in a thermal management system is in a surge state at the current moment or not is judged through obtaining working condition information of the thermal management system in a preset time interval, and under the condition that the engine is in the surge state, the accumulated time length of the engine in the surge state in the preset time interval is determined, further, the minimum opening and closing speed of an air inlet throttle valve connected with the engine are subjected to iterative correction, a control signal is output after each correction until a condition of stopping correction is met, in each correction, the ratio of the accumulated time length to the total time length of the preset time interval is firstly determined, and is larger than a first threshold value, namely, the engine is in the surge state for a longer time, so that the surge strength is judged to be larger, and the risk is higher; and when the ratio is smaller than the second threshold value, that is, the engine is in a surge state for a short time, it can be determined that the surge strength is weak and the risk is low, at this time, the minimum opening of the air intake throttle valve is negatively corrected by adopting the first correction coefficient to reduce the opening of the air intake throttle valve, and the minimum opening of the air intake throttle valve is positively corrected by adopting the second correction coefficient to increase the closing speed of the air intake throttle valve, so that certain thermal management capability can be recovered. Therefore, through the iterative correction, the correction direction of the minimum opening degree of the air inlet throttle valve and the correction direction of the closing speed can be determined by evaluating the surge degree in the preset time interval, so that the problem of surge caused by engine thermal management in the prior art is solved, and the aim of better balancing the engine thermal management in the thermal management system is fulfilled.

In a specific implementation, in some optional embodiments, step S203 includes: step S2031, judging whether the ratio is larger than a first threshold; step S2032, performing positive correction on the minimum opening according to the first correction coefficient and performing negative correction on the closing speed according to the second correction coefficient when the ratio is greater than the first threshold; step S2033, determining whether the ratio is smaller than the second threshold if the ratio is smaller than or equal to the first threshold; in step S2034, when the ratio is smaller than the second threshold, the minimum opening is negatively corrected according to the first correction coefficient, and the closing speed is positively corrected according to the second correction coefficient, as shown in fig. 3.

Specifically, when the first threshold is greater than the second threshold, the opening range of the intake throttle valve is set as a first opening interval when the engine of the thermal management system is not in a surge condition, and when the engine of the thermal management system is not in a surge condition, the speed range of the closing speed of the intake throttle valve is set as a first speed interval. In this case, the thermal management system still needs to correct the minimum opening and closing speed of the air intake throttle valve, so as to judge whether the minimum opening is located in the first opening section and the closing speed is located in the first speed section by judging whether the ratio of the cumulative time length of the engine in the surge state in the preset time section to the total time length of the preset time section is smaller than the second threshold value.

In some alternative embodiments, each correction further comprises: judging whether the corrected minimum opening degree meets a first preset range or not to obtain a first judgment result; judging whether the corrected closing speed meets a second preset range or not to obtain a second judging result; if the first judgment result is negative and the minimum opening is the first corrected opening, updating the corrected minimum opening to be the maximum value of a first preset range, wherein the first corrected opening is the minimum opening for positive correction; if the first judgment result is negative and the minimum opening is the second corrected opening, updating the corrected minimum opening to the minimum value of the first preset range, wherein the second corrected opening is the minimum opening for negative correction; if the second judgment result is negative and the closing speed is the first correction speed, updating the corrected closing speed to the minimum value of the second preset range, wherein the first correction speed is the closing speed for negative correction; and if the second judgment result is negative and the minimum opening degree is the second correction speed, updating the corrected closing speed to the maximum value of the first preset range, wherein the second correction speed is the closing speed for positive correction.

In the above embodiment, in each correction process, the opening degree of the intake throttle valve has a first preset range of allowable opening degree, and when the opening degree of the intake throttle valve is located between the first preset ranges, the intake throttle valve is regarded as having the minimum opening degree, and after the minimum opening degree of the intake throttle valve is corrected, the corrected minimum opening degree is updated to a new minimum opening degree of the intake throttle valve at the current time. Wherein, in the case that the new minimum opening after each update is not in the first preset range, the new minimum opening is taken as the maximum value or the minimum value of the first preset range. Specifically, the minimum opening degree at the time of performing the positive correction is taken as a first correction opening degree, so that the minimum opening degree after the completion of the update of the first correction opening degree is taken as the maximum value of the first preset range; the minimum opening at the time of negative correction is set as the second corrected opening, so that the minimum opening after the completion of the update of the second corrected opening is set as the minimum value of the first preset range.

In the above embodiment, in each correction process, the intake throttle valve has a second preset range in which the closing speed is allowable, and when the speed of the intake throttle valve is within the second preset range, the intake throttle valve is regarded as having the closing speed, and after the closing speed of the intake throttle valve is corrected, the corrected closing speed is updated to be the new closing speed of the intake throttle valve at the current time. Wherein, in case that the new closing speed after each update is not in the second preset range, the new closing speed is taken as the maximum value or the minimum value of the second preset range. Specifically, the closing speed at the time of negative correction is taken as a first correction speed, so that the closing speed after the completion of the update of the first correction speed is taken as the minimum value of a first preset range; the closing speed at the time of the positive correction is set as the second correction speed, and thus the closing speed after the completion of the update of the second correction speed is set as the maximum value of the second preset range.

As shown in fig. 4, in some alternative embodiments, in addition to the steps shown in fig. 2, the thermal management system further includes a compressor, and the operating condition information includes a first intake air flow rate and a first pressure ratio of the compressor at a current time, and before step S202, the control method of this embodiment further includes: in step S2011, whether the engine is in a surge state at the current moment is determined at least according to the first intake air flow, the first pressure ratio and the surge threshold set, wherein a plurality of surge thresholds in the surge threshold set are represented as a plurality of preset pressure ratios corresponding to a plurality of preset intake air flows one by one, the plurality of preset intake air flows comprise the first intake air flow, and the plurality of preset pressure ratios comprise the first pressure ratio.

In the above embodiment, a coordinate system may be established with the intake air flow and the pressure ratio as coordinate axes, and a curve located in the coordinate system is established according to the correspondence between the plurality of preset intake air flows and the plurality of preset pressure ratios in the surge threshold set, so as to obtain a surge line. Specifically, when the coordinates corresponding to the first intake air flow and the first pressure ratio exceed the surge line, the engine is determined to be in a surge state, and otherwise, the engine is determined not to be in the surge state.

In some alternative embodiments, step S2011, determining whether the engine is in a surge condition at the current time based at least on the first intake air flow, the first pressure ratio, and the set of surge thresholds, includes one of: judging whether the first pressure ratio is larger than a target preset pressure ratio, wherein the target preset pressure ratio is a preset pressure ratio corresponding to the first air inlet flow in a plurality of preset pressure ratios, and if the first pressure ratio is larger than the target preset pressure ratio, a first judgment result is obtained and is used for determining that the engine is in a surge state at the current moment; judging whether the first air inlet flow is larger than a target preset air inlet flow or not, wherein the target preset air inlet flow is a preset air inlet flow corresponding to a first pressure ratio in a plurality of preset air inlet flows, and obtaining a second judging result which is used for determining that the engine is in a surge state at the current moment under the condition that the first air inlet flow is larger than the target preset air inlet flow.

In the above embodiment, as one of the determination modes, among the plurality of preset pressure ratios, the preset pressure ratio corresponding to the first intake air flow rate obtained by the engine at the present time is first set as the target preset pressure ratio, and at this time, in the coordinate system established with the intake air flow rate and the pressure ratio as the abscissa axes, the first pressure ratio and the target preset pressure ratio have the same abscissa, so that by the longitudinal determination, that is, the determination as to whether the first pressure ratio is greater than the target preset pressure ratio, it is possible to determine whether the engine is in the surge state at the present time. Specifically, when the first pressure ratio is greater than the target preset pressure ratio (i.e., the first judgment result), it is judged that the engine is in a surge state at the current moment, otherwise, it is determined that the engine is not in the surge state.

In the above embodiment, as another determination method, among the plurality of preset intake air flows, the preset intake air flow corresponding to the first pressure ratio obtained by the engine at the current time is first set as the target preset intake air flow, and at this time, in the coordinate system established by taking the intake air flow and the pressure ratio as the horizontal axis and the vertical axis, the first intake air flow and the target preset intake air flow have the same vertical axis, so that by the horizontal determination, that is, the determination whether the first intake air flow is greater than the target preset intake air flow, it can be determined whether the engine is in the surge state at the current time. Specifically, when the first intake air flow is greater than the target preset intake air flow (i.e., the second judgment result), it is judged that the engine is in a surge state at the current moment, otherwise, it is determined that the engine is not in the surge state.

In some alternative embodiments, as shown in fig. 5, the operating mode information further includes a smoke limit oil amount and a circulating oil supply amount corresponding to the thermal management system, and the method further includes determining whether the engine is in a surge state at the current moment according to at least the first intake air flow, the first pressure ratio, and the surge threshold set, and further includes: step S2082, calculating a difference between the smoke limit oil quantity and the circulating oil supply quantity to obtain a first difference; step S2083, judging whether the first difference value is smaller than a transient degree threshold, wherein the transient degree threshold is expressed as the minimum transient degree when the engine is not in surge, and obtaining a third judging result when the first difference value is smaller than the transient degree threshold, and the third judging result is used for determining that the engine is in a surge state at the current moment.

In the above embodiment, the smoke limit oil amount is determined by the first intake air flow rate and the smoke limit excess air ratio, wherein the smoke limit excess air ratio is obtained by calibrating the MAP based on the engine speed and the intake air flow rate query, and optionally, the calibration value of the MAP is slightly higher than the excess air ratio of the steady-state engine. Specifically, the smoke limit oil quantity=air inlet flow rate×14.5/smoke limit excess air coefficient, wherein the thermal management system further comprises an engine air inlet booster, and when in a transient state, the engine air inlet booster has hysteresis, so that the air inlet flow rate is lower, the calculated smoke limit oil quantity is lower than the circulating oil quantity, the oil quantity is further limited, and the transient smoke degree is reduced; the circulating oil supply quantity can be obtained by actual measurement, and the transient degree threshold value is expressed as the minimum transient degree when the engine does not surge, wherein the transient degree threshold value is determined by a transient degree coefficient, a smoke limit oil quantity and the circulating oil supply quantity. When the excess air ratio of the steady-state engine is high, the calculated smoke limit oil quantity is also larger than the circulating oil supply quantity, but the smoke limit oil quantity in the transient process is limited, so that the smoke limit oil quantity is smaller and is closer to the circulating oil supply quantity when the transient degree is larger. Specifically, the above-described transient degree coefficient a= (real-time smoke limit oil amount-circulating oil amount)/(steady-state smoke limit oil amount-circulating oil amount), and further, the transient degree threshold value = a× (steady-state smoke limit oil amount-circulating oil amount), so that in the case where the transient degree is strong, the real-time smoke limit oil amount and the circulating oil amount agree with each other so that the transient degree coefficient is 0; and under the condition of weak transient degree, the transient degree coefficient is increased, so that the surge degree of the engine is judged. In order to determine whether the engine is in a surge state at the current time, in the process of acquiring working condition information of the thermal management system in a preset time interval, acquiring a smoke limit oil quantity and a circulating oil supply quantity corresponding to the thermal management system in addition to a first intake air flow, a first pressure ratio and a surge threshold set is further acquired, so that a first difference value is determined according to the smoke limit oil quantity and the circulating oil supply quantity, wherein the first difference value is used for indicating an oil supply quantity difference between an actual smoke limit oil quantity and a circulating oil supply quantity, a corresponding determination result can be obtained after the first difference value and a transient degree threshold value are compared, and further, when the determination result is that the first difference value is smaller than the transient degree threshold value (namely, a third determination result), the engine is in a surge state at the current time.

In some alternative embodiments, as shown in fig. 6, the working condition information further includes a first accelerator opening of the engine at a current time, and determining, at least according to the first intake air flow, the first pressure ratio, and the surge threshold set, whether the engine is in a surge state at the current time, further includes: step S2084, obtaining a second accelerator opening of the engine at a preset time, wherein the preset time is before the current time; step S2085, determining a decrease gradient according to the first accelerator opening and the second accelerator opening; and S2086, judging whether the decreasing gradient is larger than a gradient threshold, wherein a fourth judgment result is obtained under the condition that the decreasing gradient is larger than the gradient threshold, and the fourth judgment result is used for determining that the engine is in a surge state at the current moment.

In the above embodiment, a large accelerator development gradient indicates a severe change in the engine operating condition, and is one of the manifestations of surge. The gradient threshold is expressed as a maximum accelerator development gradient corresponding to when the engine is not in surge, in this embodiment, by acquiring a first accelerator opening at a current time and a second accelerator opening at a preset time before the current time, an opening difference between the first accelerator opening and the second accelerator opening can be determined, so as to determine a gradient of decrease in the accelerator opening in a process of reaching the first accelerator opening from the second accelerator opening, and further, in order to determine whether the engine is in a surge state at the current time, in addition to the first determination result and the third determination result or in addition to the second determination result and the third determination result, it is further determined whether the decreased gradient is greater than the gradient threshold, and in a case that the decreased gradient is greater than the gradient threshold (i.e., the fourth determination result), it is determined that the engine is in a surge state at the current time.

In some alternative embodiments, the starting time of the preset time interval is the starting time of the engine, and the ending time of the preset time interval is the current time.

In the above embodiment, by setting the starting time of the engine as the starting time of the preset time interval and the current time as the ending time of the preset time interval, the surge state of the engine from the starting time to the current time and the accumulated time length of the surge state can be obtained, and the accumulated time length is located in the preset time interval.

In some alternative embodiments, performing iterative correction on the minimum opening and closing speed, and outputting a control signal after each correction in the iterative correction until the correction stopping condition is satisfied, including: iterative correction is carried out on the minimum opening and the closing speed, and a control signal is output after each correction, so that the air inlet throttle valve executes the corrected minimum opening and the corrected closing speed; after each correction, working condition information of the engine thermal management system in a preset time interval is obtained, wherein the ending time of the preset time interval is updated current time; when the working condition information indicates that the engine is in a surge state at the updated current moment and the correction times do not reach the preset times, continuing iterative correction; and stopping iterative correction when the working condition information indicates that the stopping correction condition is met.

In the above embodiment, in order to avoid that when the number of times of correction reaches the preset number of times, there is a case that the minimum opening degree of the air intake throttle valve after correction and the closing speed after correction still do not meet the requirement of stopping correction, the present embodiment adopts the steps that firstly after each correction, the air intake throttle valve is made to execute the minimum opening degree after correction and the closing speed after correction according to the output control signal, and the current time updated after each correction is taken as the ending time of the preset time interval, the preset time interval is prolonged, the preset time interval is updated, the preset number of times after the update is further obtained, so that in the further iterative correction process, if the number of times of correction does not reach the preset number of times after the update, iterative correction is continued until the preset number of times is reached, further, if the preset number of times is reached, whether the correction condition is met is judged according to the instruction of the preset time interval after the update, and if the correction condition is met, the iterative correction is stopped, and the air intake throttle valve is made to work according to the minimum opening degree and closing speed after the last correction before the iterative correction is stopped.

In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the anti-surge control method of the engine of the present application will be described in detail below with reference to specific embodiments.

The present embodiment relates to a specific anti-surge control method of an engine, as shown in fig. 7, including the following steps of cyclically executing:

judging whether the coordinates corresponding to the first air inlet flow and the first pressure ratio at the current moment exceed the surge line, judging whether a first difference value corresponding to the smoke limit oil quantity and the circulating oil supply quantity is smaller than a transient degree threshold value (namely a transient degree condition), judging whether a reduction gradient corresponding to the first accelerator opening and the second accelerator opening is larger than a gradient threshold value (namely a gradient condition with smaller accelerator opening), and determining that the engine is in a surge state under the condition that the three judgment conditions are yes, namely the surge line is exceeded, the transient degree condition is reached, the gradient condition for reducing the accelerator opening is reached, and the engine is in a surge state so as to enable the engine to enter a self-learning state 1 and delay for a certain time;

the enabling time is accumulated in a set power window, namely, the duration in a preset time interval in a surge state is accumulated, and the accumulated duration is obtained;

Judging whether the ratio of the accumulated time of the self-learning state 1 to the total time is larger than a threshold value 1 or not, namely judging whether the ratio of the accumulated time to the total time of a preset time interval is larger than a first threshold value or not, if yes, entering a self-learning state 2 to enable, executing the steps of the minimum opening degree of the TV valve + the correction coefficient 1 and the closing speed of the TV valve-the correction coefficient 2, wherein the correction coefficient is a first correction coefficient, the correction coefficient 2 is a second correction coefficient, namely, positive correction is carried out on the minimum opening degree according to the first correction coefficient, and negative correction is carried out on the closing speed according to the second correction coefficient; if the judgment result is negative, further judging whether the ratio of the enabling accumulated time to the total time is smaller than a second threshold, wherein the second threshold is threshold 2, and if the judgment result is positive, entering a self-learning state 2 for resetting, and executing the steps of the minimum opening degree of the TV valve-correction coefficient 1 and the closing speed of the TV valve + the correction coefficient 2, namely, carrying out negative correction on the minimum opening degree according to the first correction coefficient, and carrying out positive correction on the closing speed according to the second correction coefficient so as to realize the maximum and minimum limit on the minimum opening degree of the TV valve and the maximum and minimum limit on the closing speed of the TV valve; executing the current minimum opening degree and closing speed of the TV valve under the condition that the ratio is larger than a second threshold value;

After the step of performing positive correction or negative correction on the minimum opening and the closing speed, respectively, performing a step of storing the corrected minimum opening ECU, that is, storing the corrected minimum opening in an Electronic Control Unit (ECU), performing according to the current TV valve minimum opening and closing speed stored in the Electronic Control Unit (ECU), and making the number of times of entering a set power window +1, that is, accumulating the number of times of correction, so that the number of times of correction is increased by one;

judging whether the number of times of driving circulation entering a set power window is larger than a threshold value 3, wherein the number of times of the set power window is the correction number, and the threshold value 3 is the preset number;

if the judgment result is negative, continuing to circulate the steps so as to accumulate the correction times;

and if the judgment result is yes, locking the minimum opening degree and the closing speed of the current TV valve, and executing the minimum opening degree and the closing speed of the current TV valve.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides an anti-surge control device of the engine, and the anti-surge control device of the engine can be used for executing the anti-surge control method for the engine. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes an anti-surge control apparatus for an engine provided in an embodiment of the present application.

Fig. 8 is a schematic diagram of an anti-surge control apparatus of an engine according to an embodiment of the present application. As shown in fig. 8, the apparatus includes:

the acquiring module 301 is configured to acquire working condition information of a thermal management system in a preset time interval, where the thermal management system includes an engine, and an air inlet of the engine is connected with an air inlet throttle valve;

The determining module 302 is configured to determine, when the working condition information indicates that the engine is in a surge state at a current time, an accumulated duration of the engine in the surge state in a preset time interval, where the current time is located in the preset time interval;

The correction module 303 is configured to perform iterative correction on the minimum opening and the closing speed of the intake throttle valve, and output a control signal after each correction in the iterative correction until a stop correction condition is satisfied, where the control signal is used to control the intake throttle valve to perform the minimum opening and the closing speed after the correction, and the stop correction condition includes at least one of: the engine is not in a surge condition and the number of corrections reaches a preset number.

Wherein each correction in the iterative correction includes: the judging module is used for judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold value or smaller than a second threshold value;

The method includes the steps of obtaining working condition information of an engine at a current moment after first correction, determining whether the engine is in a surge state at the current moment according to the working condition information, and performing second correction on the minimum opening degree and the closing speed of an air inlet throttle valve and sequentially circulating until correction conditions are met under the condition that the engine is still in the surge state.

For example, a preset number of iterative corrections, which is a minimum number of iterations that can cause the engine to deviate from a surge state, is preset so that the engine deviates from the surge state after the minimum opening and closing speed of the intake throttle valve are iteratively corrected to the preset number of times. Iterative correction is carried out on the minimum opening and the closing speed of the air inlet throttle valve, the correction is stopped until the correction times reach the preset times, and a control signal is output, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed, and the method comprises the following steps: performing iterative correction on the minimum opening and the closing speed, and outputting a control signal after each correction in the iterative correction until a stop correction condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the corrected minimum opening and the corrected closing speed, and the stop correction condition comprises at least one of the following: the engine is not in a surge condition and the number of corrections reaches a preset number.

The first correction submodule is used for carrying out positive correction on the minimum opening according to the first correction coefficient and carrying out negative correction on the closing speed according to the second correction coefficient when the ratio is larger than a first threshold value;

specifically, in each correction process, when the ratio of the cumulative duration of the engine in the surge state in the preset time interval to the total duration of the preset time interval is greater than a first threshold value, the minimum opening degree of the air inlet throttle valve connected with the engine is excessively large, and the closing speed of the air inlet throttle valve is excessively slow, so that the minimum opening degree is corrected by adopting a first correction coefficient, and the closing speed is corrected by adopting a second correction coefficient. And when the ratio is smaller than the second threshold value, carrying out negative correction on the minimum opening according to the first correction coefficient, and carrying out positive correction on the closing speed according to the second correction coefficient.

In a specific implementation process, in some optional embodiments, the judging module includes: the first judging submodule is used for judging whether the ratio is larger than a first threshold value or not; the second judging submodule is used for judging whether the ratio is smaller than a second threshold value or not under the condition that the ratio is smaller than or equal to the first threshold value;

In some alternative embodiments, each correction further comprises: the first processing module is used for judging whether the corrected minimum opening degree meets a first preset range or not to obtain a first judgment result; the second processing module is used for judging whether the corrected closing speed meets a second preset range or not to obtain a second judging result; the third processing module is used for updating the corrected minimum opening to the maximum value of the first preset range under the condition that the first judging result is no and the minimum opening is the first corrected opening, wherein the first corrected opening is the minimum opening for positive correction; a fourth processing module, configured to update the corrected minimum opening to a minimum value in the first preset range when the first determination result is no and the minimum opening is a second corrected opening, where the second corrected opening is the minimum opening for negative correction; a fifth processing module, configured to update the corrected closing speed to a minimum value in a second preset range when the second determination result is no and the closing speed is a first correction speed, where the first correction speed is a closing speed for performing negative correction; and a sixth processing module, configured to update the corrected closing speed to a maximum value of the first preset range when the second determination result is no and the minimum opening is the second correction speed, where the second correction speed is the closing speed that is being corrected.

In some alternative embodiments, the thermal management system further includes a compressor, the operating condition information includes a first intake flow rate and a first pressure ratio of the compressor at a current time, and the control device further includes: the first judging module is used for judging whether the engine is in a surge state at the current moment or not according to at least the first air inlet flow, the first pressure ratio and the surge threshold value set, wherein a plurality of surge threshold values in the surge threshold value set are expressed as a plurality of preset pressure ratios corresponding to a plurality of preset air inlet flow one by one, the plurality of preset air inlet flow comprises the first air inlet flow, and the plurality of preset pressure ratios comprise the first pressure ratio.

In some alternative embodiments, the first determining module includes one of: the third judging submodule is used for judging whether the first pressure ratio is larger than a target preset pressure ratio or not, wherein the target preset pressure ratio is a preset pressure ratio corresponding to the first air inlet flow in a plurality of preset pressure ratios, and a first judging result is obtained when the first pressure ratio is larger than the target preset pressure ratio and is used for determining that the engine is in a surge state at the current moment; and the fourth judging submodule is used for judging whether the first air inlet flow is larger than a target preset air inlet flow or not, wherein the target preset air inlet flow is a preset air inlet flow corresponding to the first pressure ratio in a plurality of preset air inlet flows, and a second judging result is obtained when the first air inlet flow is larger than the target preset air inlet flow and is used for determining that the engine is in a surge state at the current moment.

In some alternative embodiments, the operating mode information further includes a smoke limit oil amount and a circulating oil supply amount corresponding to the thermal management system, and the first judging module further includes: the seventh processing module is used for calculating the difference value between the smoke limit oil quantity and the circulating oil supply quantity to obtain a first difference value; and the fourth judging submodule is used for judging whether the first difference value is smaller than a transient degree threshold value or not, wherein the transient degree threshold value is expressed as the minimum transient degree when the engine does not surge, and a third judging result is obtained under the condition that the first difference value is smaller than the transient degree threshold value and is used for determining that the engine is in a surge state at the current moment.

In some optional embodiments, the working condition information further includes a first accelerator opening of the engine at a current time, and the first judging module further includes: the eighth processing module is used for acquiring a second accelerator opening of the engine at a preset time, wherein the preset time is before the current time; the ninth processing module is used for determining a reduction gradient according to the first accelerator opening and the second accelerator opening; and the fifth judging submodule is used for judging whether the decreasing gradient is larger than a gradient threshold value, wherein a fourth judging result is obtained under the condition that the decreasing gradient is larger than the gradient threshold value, and the fourth judging result is used for determining that the engine is in a surge state at the current moment.

In some optional embodiments, the setting module is configured to set a start time of the preset time interval to be a start time of the engine, and an end time of the preset time interval to be a current time.

In some alternative embodiments, the tenth processing module comprises: the first processing submodule is used for carrying out iterative correction on the minimum opening and the closing speed and outputting a control signal after each correction so that the air inlet throttle valve executes the corrected minimum opening and the corrected closing speed; the second processing sub-module is used for acquiring the working condition information of the engine thermal management system in a preset time interval after each correction, wherein the ending time of the preset time interval is updated current time; the third processing sub-module is used for continuing iterative correction when the working condition information indicates that the engine is in a surge state at the updated current moment and the correction times do not reach the preset times; and the fourth processing submodule is used for stopping iterative correction under the condition that the working condition information indicates that the stopping correction condition is met.

The anti-surge control device of the engine comprises a processor and a memory, wherein the acquisition module, the determination module, the correction module, the first judgment sub-module, the first correction sub-module, the second judgment sub-module, the second correction sub-module and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel can be provided with one or more than one kernel, and the aim of solving the surge problem caused by engine heat management in the prior art is fulfilled by adjusting kernel parameters.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein when the program runs, equipment where the computer readable storage medium is controlled to execute an anti-surge control method of an engine.

The embodiment of the invention provides electronic equipment, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the anti-surge control method of the engine. The electronic device herein may be a server, a PC, a PAD, a mobile phone, etc.

The present application also provides a computer program product adapted to perform a program initialized with at least the steps of an anti-surge control method of an engine as described above when executed on a data processing device.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that 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.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. 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.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

judging whether an engine in a thermal management system is in a surge state at the current moment or not through acquiring working condition information of the thermal management system in a preset time interval, determining the accumulated time length of the engine in the surge state in the preset time interval under the condition of the surge state, further carrying out iterative correction on the minimum opening and closing speed of an air inlet throttle valve connected with the engine, and outputting a control signal after each correction until a condition of stopping correction is met, wherein in each correction, firstly, determining the ratio of the accumulated time length to the total time length of the preset time interval, and under the condition that the ratio is larger than a first threshold value, namely, the engine is in the surge state for a longer time, determining that the surge strength is larger, and the risk is higher; and when the ratio is smaller than the second threshold value, that is, the engine is in a surge state for a short time, it can be determined that the surge strength is weak and the risk is low, at this time, the minimum opening of the air intake throttle valve is negatively corrected by adopting the first correction coefficient to reduce the opening of the air intake throttle valve, and the minimum opening of the air intake throttle valve is positively corrected by adopting the second correction coefficient to increase the closing speed of the air intake throttle valve, so that certain thermal management capability can be recovered. Therefore, through the iterative correction, the correction direction of the minimum opening degree of the air inlet throttle valve and the correction direction of the closing speed can be determined by evaluating the surge degree in the preset time interval, so that the problem of surge caused by engine thermal management in the prior art is solved, and the aim of better balancing the engine thermal management in the thermal management system is fulfilled.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An anti-surge control method of an engine, comprising:

acquiring working condition information of a thermal management system in a preset time interval, wherein the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve;

determining the accumulated duration of the engine in the surge state in the preset time interval under the condition that the working condition information indicates that the engine is in the surge state at the current time, wherein the current time is located in the preset time interval;

performing iterative correction on the minimum opening degree and the closing speed of the air inlet throttle valve, and outputting a control signal after each correction in the iterative correction until a stopping correction condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the minimum opening degree after the correction and the closing speed after the correction, and the stopping correction condition comprises at least one of the following: the engine is not in a surge condition, and the number of corrections reaches a preset number of times, wherein each correction in the iterative correction comprises:

Judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold or smaller than a second threshold;

when the ratio is larger than the first threshold value, positive correction is performed on the minimum opening according to a first correction coefficient, and negative correction is performed on the closing speed according to a second correction coefficient;

2. The method of claim 1, wherein the determining whether the ratio of the accumulated time length to the total time length of the preset time interval is greater than a first threshold or less than the second threshold comprises:

judging whether the ratio is greater than the first threshold;

and judging whether the ratio is smaller than the second threshold value or not under the condition that the ratio is smaller than or equal to the first threshold value.

3. The method of claim 1, wherein each correction further comprises:

judging whether the corrected minimum opening degree meets a first preset range or not to obtain a first judgment result;

Judging whether the corrected closing speed meets a second preset range or not to obtain a second judging result;

if the first judgment result is no and the minimum opening is a first corrected opening, updating the corrected minimum opening to be the maximum value of the first preset range, wherein the first corrected opening is the minimum opening subjected to positive correction;

if the first judgment result is no and the minimum opening is a second corrected opening, updating the corrected minimum opening to be the minimum value of the first preset range, wherein the second corrected opening is the minimum opening subjected to negative correction;

if the second judgment result is no and the closing speed is a first correction speed, updating the corrected closing speed to the minimum value of the second preset range, wherein the first correction speed is the closing speed for negative correction;

and if the second judgment result is negative and the minimum opening degree is a second correction speed, updating the corrected closing speed to be the maximum value of the first preset range, wherein the second correction speed is the closing speed subjected to positive correction.

4. A control method according to claim 3, wherein the thermal management system further comprises a compressor, the operating condition information comprising a first intake flow rate and a first pressure ratio of the compressor at the current time, the control method further comprising:

judging whether the engine is in a surge state at the current moment or not according to at least the first air inlet flow, the first pressure ratio and a surge threshold set, wherein a plurality of surge thresholds in the surge threshold set are expressed as a plurality of preset pressure ratios corresponding to a plurality of preset air inlet flows one by one, the plurality of preset air inlet flows comprise the first air inlet flow, and the plurality of preset pressure ratios comprise the first pressure ratio.

5. The method of claim 4, wherein the determining whether the engine is in a surge condition at the current time based at least on the first intake air flow, the first pressure ratio, and the set of surge thresholds comprises one of:

judging whether the first pressure ratio is larger than a target preset pressure ratio, wherein the target preset pressure ratio is a preset pressure ratio corresponding to the first intake air flow in the preset pressure ratios, and if the first pressure ratio is larger than the target preset pressure ratio, obtaining the first judgment result, wherein the first judgment result is used for determining that the engine is in a surge state at the current moment;

Judging whether the first air inlet flow is larger than a target preset air inlet flow or not, wherein the target preset air inlet flow is the preset air inlet flow corresponding to the first pressure ratio in the preset air inlet flows, and obtaining a second judging result when the first air inlet flow is larger than the target preset air inlet flow, wherein the second judging result is used for determining that the engine is in a surge state at the current moment.

6. The method of claim 4, wherein the operating condition information further includes a smoke limit oil amount and a circulating oil supply amount corresponding to the thermal management system, the determining whether the engine is in a surge state at a current time based at least on the first intake air flow, the first pressure ratio, and the set of surge thresholds, further comprising:

calculating the difference value between the smoke limit oil quantity and the circulating oil supply quantity to obtain a first difference value;

judging whether the first difference value is smaller than a transient degree threshold value or not, wherein the transient degree threshold value is expressed as the minimum transient degree when the engine is not in surge, and obtaining a third judging result under the condition that the first difference value is smaller than the transient degree threshold value, wherein the third judging result is used for determining that the engine is in a surge state at the current moment.

7. The method of claim 4, wherein the operating condition information further comprises a first accelerator opening of the engine at the current time, the determining whether the engine is in a surge condition at the current time based at least on the first intake air flow, the first pressure ratio, and the set of surge thresholds, further comprising:

acquiring a second accelerator opening of the engine at a preset time, wherein the preset time is before the current time;

determining a reduction gradient according to the first accelerator opening and the second accelerator opening;

and judging whether the reduction gradient is larger than a gradient threshold value, wherein a fourth judgment result is obtained under the condition that the reduction gradient is larger than the gradient threshold value, and the fourth judgment result is used for determining that the engine is in a surge state at the current moment.

8. The method according to any one of claims 1 to 7, characterized in that a start time of the preset time interval is a start time of the engine and an end time of the preset time interval is the current time.

9. The method according to any one of claims 1 to 7, characterized in that performing iterative correction of the minimum opening degree and the closing speed, and outputting a control signal after each correction in the iterative correction until the correction stop condition is satisfied, includes:

Performing iterative correction on the minimum opening and the closing speed, and outputting a control signal after each correction so that the air inlet throttle valve executes the corrected minimum opening and the corrected closing speed;

after each correction, acquiring working condition information of the engine thermal management system in the preset time interval, wherein the ending time of the preset time interval is updated current time;

continuing the iterative correction when the working condition information indicates that the engine is in a surge state at the updated current moment and the correction times do not reach the preset times;

and stopping the iterative correction under the condition that the working condition information indicates that the stopping correction condition is met.

10. An anti-surge control apparatus for an engine, comprising:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring working condition information of a thermal management system in a preset time interval, the thermal management system comprises an engine, and an air inlet of the engine is connected with an air inlet throttle valve;

the determining module is used for determining the accumulated duration of the engine in the surge state in the preset time interval under the condition that the working condition information indicates that the engine is in the surge state at the current time, wherein the current time is located in the preset time interval;

The correction module is used for carrying out iterative correction on the minimum opening degree and the closing speed of the air inlet throttle valve and outputting a control signal after each correction in the iterative correction until a stop correction condition is met, wherein the control signal is used for controlling the air inlet throttle valve to execute the minimum opening degree and the closing speed after the correction, and the stop correction condition comprises at least one of the following: the engine is not in a surge condition, and the number of corrections reaches a preset number of times, wherein each correction in the iterative correction comprises:

the judging module is used for judging whether the ratio of the accumulated time length to the total time length of the preset time interval is larger than a first threshold value or smaller than a second threshold value;

the first correction submodule is used for carrying out positive correction on the minimum opening according to a first correction coefficient and carrying out negative correction on the closing speed according to a second correction coefficient when the ratio is larger than the first threshold value;

and the second correction submodule is used for carrying out negative correction on the minimum opening according to the first correction coefficient and carrying out positive correction on the closing speed according to the second correction coefficient when the ratio is smaller than the second threshold value.

11. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to perform the anti-surge control method of the engine according to any one of claims 1 to 9.

12. An electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the anti-surge control method of the engine of any of claims 1-9.