CN115217620A - Control method and device for preventing surge of supercharger, vehicle and storage medium - Google Patents
Control method and device for preventing surge of supercharger, vehicle and storage medium Download PDFInfo
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- 238000001914 filtration Methods 0.000 claims description 6
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Supercharger (AREA)
Abstract
The invention discloses a control method and a control device for preventing surge of a supercharger, a vehicle and a storage medium, wherein the method comprises the following steps: collecting the current flow of a compressor of the supercharger; calculating an actual difference value between the current compressor flow and a preset surge flow of the supercharger; and matching the optimal compressor pressure ratio of the supercharger according to the actual difference value, and controlling the supercharging pressure of the supercharger according to the optimal compressor pressure ratio. According to the embodiment of the application, the optimal compressor pressure ratio of the internal combustion engine can be matched according to the actual difference value between the current compressor flow and the surge flow of the supercharger, so that the supercharger is controlled to drive air to enter the engine, the running working condition of the supercharger is guaranteed to run on the left side of a surge line all the time, and the purpose of preventing the supercharger from surging is achieved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a control method and device for preventing surge of a supercharger, a vehicle and a storage medium.
Background
Currently, the maximum power that can be generated by an internal combustion engine is determined primarily by the amount of heat released from the effective combustion of fuel in the cylinder, which is limited by the actual amount of air drawn into the cylinder per cycle, and therefore, a turbocharger is often required to drive the air intake. Specifically, the turbocharger can drive a turbine by utilizing the energy of exhaust gas, the turbine drives the compressor to rotate to apply work to air, and the air is compressed to increase the air inflow, so that the power performance of the internal combustion engine is improved, the economy is improved, and the plateau power compensation effect is realized.
In the related art, a Variable mechanism supercharger such as a VGT (Variable geometry turbocharger) turbocharger and an eWGT (electrically controlled bleed valve) supercharger can be controlled according to a use situation, and is generally applied to an internal combustion engine.
However, because the operating scenes of the internal combustion engine are different, the situation of surging of the supercharger can be avoided, the operating stability of the engine is affected, the supercharger is damaged seriously, or the service life of the supercharger is reduced, the reliability and stability of the vehicle are affected, and the driving experience of the vehicle is affected, and thus the solution is urgently needed.
Disclosure of Invention
In view of the above, the present invention aims to provide a control method for preventing surge of a supercharger, which can match an optimal compressor pressure ratio of an internal combustion engine according to an actual difference value between the current compressor flow and the surge flow of the supercharger, and further control the supercharger to drive air intake of the engine.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method for preventing surge in a supercharger comprising the steps of: collecting the current flow of a compressor of the supercharger; calculating an actual difference value between the current compressor flow and a preset surge flow of the supercharger; and matching the optimal compressor pressure ratio of the supercharger according to the actual difference value, and controlling the supercharging pressure of the supercharger according to the optimal compressor pressure ratio.
Optionally, in an embodiment of the present application, before calculating the actual difference between the current compressor flow and the surge flow of the supercharger, the method further includes: acquiring a surge line of the supercharger and a current compressor pressure ratio; and determining the preset surge flow corresponding to the current compressor pressure ratio of the supercharger based on the surge line.
Optionally, in an embodiment of the present application, the calculation formula of the current compressor pressure ratio is:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
where Pair is atmospheric pressure, pmix is pressure at the intake manifold, PICdiff is intercooling pressure drop, and PAFdiff is air filtration pressure drop.
Optionally, in an embodiment of the present application, the matching the optimal compressor pressure ratio of the internal combustion engine according to the actual difference value includes: calculating to obtain the flow deviation percentage according to the actual difference value and the current compressor flow of the supercharger; judging whether the flow deviation percentage is larger than a preset threshold value or not; if the flow deviation percentage is larger than the preset threshold value, taking the current compressor pressure ratio of the supercharger as the optimal compressor pressure ratio; and if the flow deviation percentage is less than or equal to the preset threshold, correcting the current compressor pressure ratio by using a preset correction coefficient, and taking the corrected current compressor pressure ratio as the optimal compressor pressure ratio.
Optionally, in an embodiment of the present application, the calculation formula of the flow deviation percentage is:
△m＝(m-m’)/m，
wherein m is the measured flow of the supercharger, and m' is the surge flow of the supercharger.
Optionally, in an embodiment of the application, after taking the corrected compressor pressure ratio as the optimal compressor pressure ratio, the controlling the boost pressure of the supercharger according to the optimal compressor pressure ratio includes: calculating the current required pressure of the supercharger according to the optimal compressor pressure ratio; and carrying out dynamic PID adjustment on the supercharger according to the current demand pressure so as to control the supercharging pressure of the supercharger to reach the current demand pressure.
Optionally, in an embodiment of the present application, the preset correction factor is 0.98, and the preset threshold is 5%.
Compared with the prior art, the control method for preventing the surge of the supercharger has the following advantages:
according to the control method for preventing the surge of the supercharger, the pressure ratio of the compressor of the internal combustion engine can be finely adjusted according to the actual difference value between the current compressor flow and the surge flow of the supercharger, the running condition of the supercharger is guaranteed to run on the left side of a surge line all the time, and the purpose of preventing the surge of the supercharger is achieved. Therefore, the technical problems that in the related technology, due to different use working scenes of the internal combustion engine, the surge of the supercharger is easily caused, the working stability of the engine is further influenced, the supercharger is damaged in serious cases, or the service life of the supercharger is shortened, the reliability and stability of a vehicle are influenced, and the driving experience of the vehicle is influenced are solved.
A second object of the present application is to provide a control device for preventing surge of a supercharger, which can match the optimum compressor pressure ratio of an internal combustion engine according to the actual difference between the current compressor flow and the surge flow of the supercharger, thereby controlling the supercharger to drive air intake of the engine.
In order to achieve the purpose, the technical scheme of the application is realized as follows:
a control device to prevent surge in a supercharger comprising: the acquisition module is used for acquiring the current flow of the compressor of the supercharger; the calculation module is used for calculating an actual difference value between the current compressor flow and a preset surge flow of the supercharger; and the control module is used for matching the optimal compressor pressure ratio of the supercharger according to the actual difference value and controlling the supercharging pressure of the supercharger according to the optimal compressor pressure ratio.
Optionally, in an embodiment of the present application, the method further includes: the acquisition module is used for acquiring a surge line of the supercharger and the current compressor pressure ratio; and the determining module is used for determining the preset surge flow corresponding to the current compressor pressure ratio of the supercharger based on the surge line.
Optionally, in an embodiment of the present application, the control module is further configured to: calculating to obtain the flow deviation percentage according to the actual difference value and the current compressor flow of the supercharger; judging whether the flow deviation percentage is greater than a preset threshold value or not; when the flow deviation percentage is larger than the preset threshold, taking the current compressor pressure ratio of the supercharger as the optimal compressor pressure ratio, and when the actual difference value is smaller than or equal to the preset threshold, correcting the current compressor pressure ratio by a preset correction coefficient, and taking the corrected compressor pressure ratio as the optimal compressor pressure ratio;
wherein, the calculation formula of the flow deviation percentage is as follows:
△m＝(m-m’)/m，
wherein m is the measured flow of the supercharger, and m' is the surge flow of the supercharger;
optionally, in an embodiment of the present application, the calculation formula of the current compressor pressure ratio is:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
wherein Pair is atmospheric pressure, pmix is pressure at the intake manifold, PICdiff is intercooling pressure drop, and PAFdiff is air filtration pressure drop.
The control device for preventing the surge of the supercharger and the control method for preventing the surge of the supercharger have the same advantages compared with the prior art, and the detailed description is omitted.
A third object of the present invention is to provide a vehicle, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor and configured to perform the control method for preventing surge in a supercharger as described in the above embodiments.
A fourth object of the present application is to provide a computer-readable storage medium storing computer instructions for causing the computer to execute the control method for preventing surge of a supercharger according to the above embodiment.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a control method for preventing surge in a supercharger according to an embodiment of the present application;
FIG. 2 is a schematic representation of a linear relationship of compressor pressure ratio to compressor flow for a control method of preventing supercharger surge according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a control method for preventing surge in a supercharger according to one embodiment of the present application;
FIG. 4 is a flow chart of a control method of preventing surge in a supercharger according to one embodiment of the present application;
FIG. 5 is a schematic structural diagram of a control device for preventing surge of a supercharger according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present application.
Description of reference numerals:
10-a control device to prevent surge of the supercharger; 100-an acquisition module, 200-a calculation module and 300-a control module; 400-compressor, 401-air flow meter, 402-supercharger, 403-intercooler, 404-intake manifold pressure sensor; 500-engine, 600-ECU; 601-memory, 602-processor and 603-communication interface.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The following describes a control method, a control device, a vehicle, and a storage medium for preventing surge of a supercharger according to an embodiment of the present application with reference to the drawings. Aiming at the problems that the supercharger can be controlled according to the using condition because the superchargers with variable mechanisms, such as a VGT turbocharger, an eWGT supercharger and the like, mentioned in the background technology, but the working scene of an internal combustion engine is different, and the condition of surge can occur to the inevitable supercharger, so that the working stability of an engine is influenced, and the supercharger is seriously damaged, the invention provides a control method for preventing the surge of the supercharger. Therefore, the technical problems that in the related art, due to different use working scenes of the internal combustion engine, the condition that the supercharger surges easily occurs, the working stability of the engine is influenced, the supercharger is damaged in serious cases, or the service life of the supercharger is reduced, the reliability and stability of a vehicle are influenced, and the driving experience of the vehicle is influenced are solved.
Specifically, FIG. 1 is a flow chart of a control method of preventing surge in a supercharger according to an embodiment of the present invention.
As shown in fig. 1, the control method for preventing surge of a supercharger according to an embodiment of the present invention comprises the steps of:
in step S101, the current compressor flow of the supercharger is collected.
It will be appreciated that the supercharger is actually an air compressor and can increase the amount of intake air by compressing the air to ensure proper operation of the engine. The method and the device for acquiring the current compressor flow of the supercharger are used for acquiring the current air flow of the supercharger, if the current compressor flow can be acquired in real time by adopting the air flow meter and then used as a basis for subsequently calculating an actual difference value between the current compressor flow and surge flow, the acquisition mode can be various, and no specific limitation is made here for avoiding redundancy.
In step S102, an actual difference between the current compressor flow and a preset surge flow of the supercharger is calculated.
In the actual execution process, the embodiment of the application can calculate the actual difference between the current compressor flow and the preset supercharger surge flow according to the collected current compressor flow of the supercharger, and then can finely adjust the air pressure of the internal combustion gas according to the actual difference, so as to achieve the purpose of preventing the supercharger surge, which will be described in detail below.
Optionally, in an embodiment of the present application, before calculating the actual difference between the current compressor flow and the surge flow of the supercharger, the method further includes: acquiring a surge line of the supercharger and the current pressure ratio of the compressor; and determining a preset surge flow corresponding to the current compressor pressure ratio of the supercharger based on the surge line.
Specifically, according to the embodiment of the application, the surge flow corresponding to the current surge point of the supercharger can be obtained according to the preset surge line, wherein the surge point is a working point where surge occurs, the surge flow is the flow corresponding to the surge point, the surge line is obtained by continuously obtaining all surge points at different rotating speeds, the surge line of the supercharger can be provided by a supercharger part supplier or obtained by actual measurement through experiments, the surge prevention accuracy and precision can be improved, the surge prevention requirement can be effectively met, and the prevention effect can be achieved.
Optionally, in an embodiment of the present application, the calculation formula of the current compressor pressure ratio is:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
where Pair is atmospheric pressure, pmix is pressure at the intake manifold, PICdiff is intercooling pressure drop, and PAFdiff is air filtration pressure drop.
As a possible implementation manner, the calculation formula of the compressor pressure ratio in the embodiment of the present application may be as follows:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
wherein Prat is the pressure ratio, pair is the atmospheric pressure, which is the measured value of the ECU, pmix is the pressure at the intake manifold, which is the measured value of the intake manifold pressure sensor, PICdiff is the intercooling pressure drop, which is the calculated value of the ECU model, PAFdiff is the air filter pressure drop, which is the calculated value of the ECU model, and the value obtained by Pmix + PICdiff is the required pressure value.
In step S103, the optimal compressor pressure ratio of the supercharger is matched according to the actual difference value, and the supercharging pressure of the supercharger is controlled according to the optimal compressor pressure ratio.
It can be understood that, during the operation of the supercharger, the pressure ratio is always reduced in a constant flow rate, as shown in fig. 2, it is easy to change the supercharger from the operation point a to a '(close to the surge line and with a surge risk) or even to a ″ (beyond the surge line and with a surge), in order to avoid the above situation, the embodiment of the present application may reduce the pressure ratio at the same time when the flow rate is reduced, so that the operation point is changed from a to B instead of a', thereby realizing the surge warning and prevention of the supercharger, which will be described in detail below.
As a possible implementation manner, the embodiment of the application can query a relation table between a difference value and an optimal compressor pressure ratio or query a database by taking the difference value as an index according to an actual difference value between the current compressor flow and the surge flow of the supercharger, match the current optimal compressor pressure ratio of the internal combustion engine, and control the operation of the supercharger according to the obtained current optimal compressor pressure ratio, so as to adjust the current intake flow of the engine, further achieve the purpose of preventing the surge of the supercharger, avoid the surge phenomenon, and achieve the purpose of protecting the supercharger.
Optionally, in an embodiment of the present application, matching an optimal compressor pressure ratio of the internal combustion engine according to the actual difference comprises: calculating to obtain the flow deviation percentage according to the actual difference value and the current compressor flow of the supercharger; judging whether the flow deviation percentage is greater than a preset threshold value or not; if the flow deviation percentage is larger than a preset threshold value, taking the current compressor pressure ratio of the supercharger as the optimal compressor pressure ratio; and if the flow deviation percentage is less than or equal to a preset threshold value, correcting the current compressor pressure ratio by using a preset correction coefficient, and taking the corrected compressor pressure ratio as the optimal compressor pressure ratio.
In the actual implementation process, the embodiment of the application can monitor the current compressor flow value of the supercharger and the current corresponding surge flow measured by the air flow meter in real time and calculate the deviation percentage of the current compressor flow value and the current corresponding surge flow.
The embodiment of the application can preset a threshold value, and compares the flow deviation percentage with the preset threshold value in real time:
when the flow deviation percentage is larger than the threshold value, the current compressor pressure ratio is not corrected, and the current compressor pressure ratio and the air inlet flow are kept unchanged;
when the flow deviation percentage is less than or equal to the threshold, the embodiment of the application can correct the current compressor pressure ratio by using the preset correction coefficient, and adjust the current compressor pressure ratio and the air intake flow by using the corrected compressor pressure ratio as the optimal compressor pressure ratio.
Note that the preset threshold value will be described below.
Optionally, in an embodiment of the present application, the calculation formula of the flow deviation percentage is:
△m＝(m-m’)/m，
wherein m is the measured flow of the supercharger, and m' is the surge flow of the supercharger.
In the actual implementation process, the embodiment of the application can monitor the current compressor flow value m of the supercharger and the current corresponding surge flow m 'which are actually measured by the air flow meter in real time, calculate the deviation percentage Δ m of the current compressor flow value m and the current corresponding surge flow m', and control the pressure ratio and the intake flow of the current compressor by comparing the flow deviation percentage with a preset threshold, wherein the calculation formula of the flow deviation percentage Δ m can be as follows:
△m＝(m-m’)/m。
optionally, in an embodiment of the present application, after taking the corrected compressor pressure ratio as the optimum compressor pressure ratio, controlling the supercharger to drive the air intake to the engine according to the optimum compressor pressure ratio includes: calculating the current required pressure of the supercharger according to the optimal compressor pressure ratio; and carrying out dynamic PID adjustment on the supercharger according to the current demand pressure so as to control the supercharging pressure of the supercharger to reach the current demand pressure.
Specifically, the preset threshold may be set as m1, and when the flow deviation Δ m is smaller than or equal to the threshold m1, the embodiment of the present application may multiply the current compressor pressure ratio by a correction coefficient k, and calculate the required pressure value according to the corrected pressure ratio.
The embodiment of the application can carry out dynamic PID adjustment to the supercharger according to the required supercharging pressure to realize the control of the opening degree of the supercharger or the opening degree of the air release valve, so that the required pressure is achieved.
At the moment, the pressure ratio of the air compressor under the working condition is reduced, the surge flow corresponding to the reduced pressure ratio of the air compressor is defined to be reduced to m2, at the moment, the actually measured flow m is continuously compared with the surge flow m2, the deviation percentage delta m is calculated, the delta m is continuously compared with m1, if the delta m is still smaller than or equal to the threshold m1, the current pressure ratio of the air compressor is continuously corrected until the delta m is larger than m1, and at the moment, the pressure ratio of the air compressor is the required pressure ratio after surge early warning correction.
The embodiment of the application can perform early warning protection when the supercharger is in the condition of easy surge (large pressure ratio and small flow), can also perform surge prevention under the condition that the flow is suddenly reduced when the pressure ratio is unchanged, and can provide boost pressure to the maximum extent on the premise of meeting the requirement of no surge by using dynamic PI regulation.
Note that the correction coefficient k will be described later.
Optionally, in an embodiment of the present application, the preset correction factor is 0.98, and the preset threshold is 5%.
It can be understood that the preset correction coefficient needs to be less than or equal to 1, and through a large amount of data analysis, the embodiment of the present application may set the value of the preset correction coefficient k to 0.98 and the value of the preset threshold m1 to 5%, thereby achieving the optimal anti-surge effect on the supercharger.
The control method for preventing surge of a supercharger according to the embodiment of the present application will be described in detail with reference to fig. 3 and 4.
As shown in fig. 3, the embodiment of the present application includes: compressor 400, air flow meter 401, supercharger 402, intercooler 403, intake manifold pressure sensor 404, engine 500, and ECU600.
As shown in fig. 4, the control method for preventing surge of a supercharger according to the embodiment of the present application specifically includes:
step S401: and actually measuring the flow m of the compressor. According to the embodiment of the application, the flow m of the compressor can be actually measured through the air flow meter 401.
Step S402: the percent flow deviation Δ m is calculated. In the embodiment of the present application, each pressure ratio and the corresponding surge flow value may be calibrated to an ECU (Electronic Control Unit) 600 according to a surge line of the supercharger 402 provided by a supplier of supercharger components. The ECU600 monitors the actual measurement value m of the air flow meter 401 and the surge flow m ' corresponding to the current pressure ratio in real time, and calculates the deviation percentages of the actual measurement value m and the surge flow m ' of the supercharger 402, and the flow deviation percentage Deltam between the actual measurement value m of the air flow meter 401 and the surge flow m ' of the supercharger 402.
Wherein, the calculation formula of the flow deviation percentage Δ m is as follows:
△m＝(m-m’)/m。
step S403: the flow deviation Δ m is compared with a threshold value m1. The embodiment of the application can compare the flow deviation Δ m with the threshold m1 in real time by setting the threshold m 1:
when the flow deviation is that the delta m is larger than the threshold value m1, the current pressure ratio is not corrected in the embodiment of the application, and the current pressure ratio of the gas compressor 400 and the gas inlet flow are kept unchanged;
when the flow deviation Δ m is less than or equal to the threshold m1, the embodiment of the present application may proceed to the next step.
Step S404: and correcting the pressure ratio of the current compressor 400 and calculating a required pressure value. According to the embodiment of the application, the current pressure ratio of the compressor 400 can be corrected by the preset correction coefficient, and the corrected pressure ratio of the compressor 400 is used as the optimal pressure ratio of the compressor 400 to adjust the pressure ratio of the compressor 400 and the air inflow.
Specifically, the adjusting method may be: according to the embodiment of the application, the current pressure ratio of the compressor 400 is multiplied by a correction coefficient k, and the required pressure value can be calculated according to the corrected pressure ratio.
The calculation formula of the demand pressure value may be as follows:
the demanded pressure value = Pmix + PICdiff,
where Pmix is the intake manifold pressure, measured by intake manifold pressure sensor 404, and PICdiff is the intercooling drop, calculated by the ECU600 model.
The compressor 400 pressure ratio may be calculated as follows:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
where Prat is the pressure ratio, pair is the atmospheric pressure, which is the measured value of the ECU600, pmix is the pressure at the intake manifold, which is the measured value of the intake manifold pressure sensor 404, PICdiff is the intercooling drop, which is the calculated value of the ECU600 model, and PAFdiff is the air filtration drop, which is the calculated value of the ECU600 model.
Step S405: ECU600 calculates the boost pressure PID adjustment in a closed loop. According to the embodiment of the application, the control on the opening degree of the supercharger 402 or the opening degree of the air bleed valve can be realized by carrying out dynamic PID (proportion integration differentiation) adjustment on the supercharger 402 according to the required supercharging pressure, so that the required pressure is achieved.
At the moment, the pressure ratio of the compressor 400 under the working condition is reduced, the surge flow corresponding to the reduced pressure ratio of the compressor 400 is reduced to m2, at the moment, the actually measured flow m is continuously compared with the surge flow m2, the deviation percentage delta m is calculated, the delta m is continuously compared with the m1, if the delta m is still smaller than the threshold m1, the current pressure ratio of the compressor 400 is continuously corrected until the delta m is larger than the m1, and the pressure ratio of the compressor 400 at the moment is the required pressure ratio of the compressor 400 after surge early warning correction.
According to the embodiment of the application, by the adjusting method, the boost pressure can be calculated in a closed loop mode through the ECU600, PID adjustment is carried out, the flow deviation delta m is detected and calculated in real time, and timely correction and adjustment of the pressure value are achieved.
It should be noted that, in the embodiment of the present application, the values of the correction coefficient k and the preset threshold m1 may be 0.98 and 5%, respectively, which are obtained by analyzing a large amount of data in the embodiment of the present application, and are more favorable for achieving the anti-surge effect of the supercharger.
According to the control method for preventing the surge of the supercharger, the pressure ratio of the compressor of the internal combustion engine can be finely adjusted according to the actual difference value between the current flow and the surge flow of the compressor of the supercharger, the running working condition of the supercharger is guaranteed to run on the left side of a surge line all the time, and the purpose of preventing the surge of the supercharger is achieved. Therefore, the technical problems that in the related art, due to different use working scenes of the internal combustion engine, the condition that the supercharger surges easily occurs, the working stability of the engine is influenced, the supercharger is damaged in serious cases, or the service life of the supercharger is reduced, the reliability and stability of a vehicle are influenced, and the driving experience of the vehicle is influenced are solved.
Further, as shown in fig. 5, the embodiment of the present invention also discloses a control device 10 for preventing surge of a supercharger, which comprises: an acquisition module 100, a calculation module 200 and a control module 300.
Specifically, as shown in fig. 5, the collecting module 100 is configured to collect a current compressor flow of the supercharger.
The calculation module 200 is used for calculating an actual difference value between the current compressor flow and the preset surge flow of the supercharger.
And the control module 300 is used for matching the optimal compressor pressure ratio of the supercharger according to the actual difference value and controlling the supercharging pressure of the supercharger according to the optimal compressor pressure ratio.
Optionally, in an embodiment of the present application, the control device 10 for preventing surge of a supercharger further comprises: the device comprises an acquisition module and a determination module.
The acquisition module is used for acquiring a surge line of the supercharger and the current compressor pressure ratio.
And the determining module is used for determining a preset surge flow corresponding to the current compressor pressure ratio of the supercharger based on the surge line.
Optionally, in an embodiment of the present application, the control module 300 is further configured to: calculating to obtain the flow deviation percentage according to the actual difference value and the current compressor flow of the supercharger; judging whether the flow deviation percentage is greater than a preset threshold value or not; when the flow deviation percentage is larger than a preset threshold value, taking the current compressor pressure ratio of the supercharger as the optimal compressor pressure ratio, and when the actual difference value is smaller than or equal to the preset threshold value, correcting the current compressor pressure ratio by using a preset correction coefficient, and taking the corrected compressor pressure ratio as the optimal compressor pressure ratio;
wherein, the calculation formula of the flow deviation percentage is as follows:
△m＝(m-m’)/m，
wherein m is the actually measured flow of the supercharger, and m' is the surge flow of the supercharger;
optionally, in an embodiment of the present application, the calculation formula of the current compressor pressure ratio is:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
where Pair is atmospheric pressure, pmix is pressure at the intake manifold, PICdiff is intercooling pressure drop, and PAFdiff is air filtration pressure drop.
According to the control device for preventing the surge of the supercharger, the compressor pressure ratio of the internal combustion engine can be finely adjusted according to the actual difference value between the current compressor flow and the surge flow of the supercharger, the running working condition of the supercharger is guaranteed to run on the left side of the surge line all the time, and the purpose of preventing the surge of the supercharger is achieved. Therefore, the technical problems that in the related art, due to different use working scenes of the internal combustion engine, the condition that the supercharger surges easily occurs, the working stability of the engine is influenced, the supercharger is damaged in serious cases, or the service life of the supercharger is reduced, the reliability and stability of a vehicle are influenced, and the driving experience of the vehicle is influenced are solved.
Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle may include:
a memory 601, a processor 602, and a computer program stored on the memory 601 and executable on the processor 602.
The processor 602, when executing the program, implements the control method for preventing surge of a supercharger provided in the above-described embodiments.
Further, the vehicle further includes:
a communication interface 603 for communicating between the memory 601 and the processor 602.
The memory 601 is used for storing computer programs that can be run on the processor 602.
If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 4, but that does not indicate only one bus or one type of bus.
Optionally, in a specific implementation, if the memory 601, the processor 602, and the communication interface 603 are integrated on a chip, the memory 601, the processor 602, and the communication interface 603 may complete mutual communication through an internal interface.
The processor 602 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
The present embodiment also provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the control method for preventing surge of a supercharger as above.
Claims (10)
1. A control method for preventing surge in a supercharger, comprising the steps of:
collecting the current compressor flow of a supercharger;
calculating an actual difference value between the current compressor flow and a preset surge flow of the supercharger; and
and matching the optimal compressor pressure ratio of the supercharger according to the actual difference value, and controlling the supercharging pressure of the supercharger according to the optimal compressor pressure ratio.
2. The method of claim 1, further comprising, prior to calculating an actual difference between a current compressor flow and the surge flow of the supercharger:
acquiring a surge line of the supercharger and a current compressor pressure ratio;
and determining the preset surge flow corresponding to the current compressor pressure ratio of the supercharger based on the surge line.
3. The method of claim 2, wherein the current compressor pressure ratio is calculated by the formula:
Prat＝(Pmix+PICdiff+Pair)/(Pair-PAFdiff)，
where Pair is atmospheric pressure, pmix is pressure at the intake manifold, PICdiff is intercooling pressure drop, and PAFdiff is air filtration pressure drop.
4. The method of claim 1, wherein said matching an optimal compressor pressure ratio of the internal combustion engine based on the actual difference comprises:
calculating to obtain the flow deviation percentage according to the actual difference and the current compressor flow of the supercharger;
judging whether the flow deviation percentage is greater than a preset threshold value or not;
if the flow deviation percentage is larger than the preset threshold value, taking the current compressor pressure ratio of the supercharger as the optimal compressor pressure ratio;
and if the flow deviation percentage is less than or equal to the preset threshold, correcting the current compressor pressure ratio by using a preset correction coefficient, and taking the corrected current compressor pressure ratio as the optimal compressor pressure ratio.
5. The method of claim 4, wherein the percent flow deviation is calculated by:
△m＝(m-m’)/m，
wherein m is the measured flow of the supercharger, and m' is the surge flow of the supercharger.
6. The method of claim 4, wherein said controlling the boost pressure of the supercharger in accordance with the optimum compressor pressure ratio after taking the corrected compressor pressure ratio as the optimum compressor pressure ratio comprises:
calculating the current required pressure of the supercharger according to the optimal compressor pressure ratio;
and carrying out dynamic PID adjustment on the supercharger according to the current demand pressure so as to control the supercharging pressure of the supercharger to reach the current demand pressure.
7. The method according to claim 4, wherein the preset correction factor is 0.98 and the preset threshold is 5%.
8. A control device for preventing surge in a supercharger, comprising:
the acquisition module is used for acquiring the current flow of the compressor of the supercharger;
the calculation module is used for calculating an actual difference value between the current compressor flow and the surge flow of the supercharger; and
and the control module is used for matching the optimal compressor pressure ratio of the internal combustion engine according to the actual difference value and controlling the supercharger to drive air to enter the engine according to the optimal compressor pressure ratio.
9. A vehicle, characterized by comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the control method of preventing surge in a supercharger of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor for implementing the control method of preventing surge of a supercharger according to any one of claims 1-7.
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| CN115492693A (en) * | 2022-11-17 | 2022-12-20 | 潍柴动力股份有限公司 | Supercharger surge identification method and device |
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| JP2001342840A (en) * | 2000-05-30 | 2001-12-14 | Mitsubishi Motors Corp | Control device of internal combustion engine having supercharger |
| US20070095063A1 (en) * | 2005-11-02 | 2007-05-03 | General Electric Company | Apparatus and method for avoidance of turbocharger surge on locomotive diesel engines |
| CN110159418A (en) * | 2019-05-22 | 2019-08-23 | 安徽江淮汽车集团股份有限公司 | Turbocharging method, pressurization control equipment, storage medium and device |
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| JP2001342840A (en) * | 2000-05-30 | 2001-12-14 | Mitsubishi Motors Corp | Control device of internal combustion engine having supercharger |
| US20070095063A1 (en) * | 2005-11-02 | 2007-05-03 | General Electric Company | Apparatus and method for avoidance of turbocharger surge on locomotive diesel engines |
| CN110159418A (en) * | 2019-05-22 | 2019-08-23 | 安徽江淮汽车集团股份有限公司 | Turbocharging method, pressurization control equipment, storage medium and device |
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| CN115492693A (en) * | 2022-11-17 | 2022-12-20 | 潍柴动力股份有限公司 | Supercharger surge identification method and device |
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