CN117072306A - Supercharger transient protection control method and device - Google Patents
Supercharger transient protection control method and device Download PDFInfo
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- CN117072306A CN117072306A CN202311282915.1A CN202311282915A CN117072306A CN 117072306 A CN117072306 A CN 117072306A CN 202311282915 A CN202311282915 A CN 202311282915A CN 117072306 A CN117072306 A CN 117072306A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000002699 waste material Substances 0.000 claims abstract description 17
- 238000001228 spectrum Methods 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- 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
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D23/00—Controlling engines characterised by their being supercharged
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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
- F02B2037/122—Control of rotational speed of the pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
A supercharger transient protection control method and device relates to the technical field of engine control, and the supercharger transient protection control method comprises the following steps: acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine; acquiring control parameters of PID control of a waste gate bypass electromagnetic valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure; acquiring integral correction parameters of integral parameters in the control parameters according to the rotating speed and the rotating speed change rate; acquiring a correction coefficient of an integral correction parameter according to the current atmospheric pressure; and correcting the integral parameter according to the integral correction parameter and the correction coefficient. The transient protection control method and device for the supercharger can ensure that the rotating speed of the supercharger has no overspeed risk even if the load is changed in a transient mode when the engine runs in different environments, and solve the technical problem that the supercharger is damaged due to the transient overspeed risk of the supercharger caused by the load transient change in the related art.
Description
Technical Field
The application relates to the technical field of engine control, in particular to a supercharger transient protection control method and device.
Background
Currently, a turbocharger is used as an air compressor, the air inflow is increased by compressing air, the inertial impulsive force of exhaust gas discharged by an engine is used for pushing a turbine in a turbine chamber, the turbine drives a coaxial impeller, and the impeller presses and pumps air sent by an air filter pipeline to be supercharged into an engine cylinder.
In the related art, a gas engine with a turbocharger adopts an air quantity closed loop in the operation process, and the duty ratio of a waste gas bypass electromagnetic valve of the turbocharger is controlled based on the required boost pressure in the heavy load so as to realize the boost pressure closed loop control of the turbocharger.
However, when the atmospheric environment changes, for example, when the gas engine enters a plateau region, the rotation speed of the turbocharger is increased due to the decrease of the intake pressure, and there is a risk of transient overspeed of the turbocharger due to the transient change of load, so that the turbocharger is damaged.
Disclosure of Invention
The application provides a supercharger transient protection control method and device, which can solve the technical problem that in the prior art, the supercharger is at a transient overspeed risk due to load transient change, so that the supercharger is damaged.
In a first aspect, an embodiment of the present application provides a turbocharger transient protection control method, including:
acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine and the current atmospheric pressure;
acquiring control parameters of PID control of a waste gate bypass electromagnetic valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure;
acquiring an integral correction parameter of an integral parameter in the control parameters according to the rotating speed and the rotating speed change rate;
acquiring a correction coefficient of the integral correction parameter according to the current atmospheric pressure;
and correcting the integral parameter according to the integral correction parameter and the correction coefficient.
With reference to the first aspect, in one embodiment, the correcting the integral parameter according to the integral correction parameter and the correction coefficient specifically includes:
obtaining the product of the integral correction parameter and the correction coefficient;
the sum of the product and the integral parameter is taken as the integral parameter after correction.
With reference to the first aspect, in one implementation manner, after taking the sum of the product and the integral parameter as the corrected integral parameter, the method further includes:
and obtaining the driving duty ratio of the supercharger waste gate solenoid valve according to the supercharging pressure difference, the proportional parameter, the derivative parameter and the corrected integral parameter of the control parameter.
With reference to the first aspect, in an embodiment, before the obtaining the integral correction parameter of the integral parameter in the control parameters according to the rotation speed and the rotation speed change rate, the method further includes:
and obtaining integral correction parameter pulse spectrums under different pre-calibrated rotating speeds and rotating speed change rates.
With reference to the first aspect, in one embodiment, the calibrating the integral correction parameter spectrum at different rotational speeds and rotational speed change rates specifically includes:
setting a reference atmospheric pressure;
under the reference atmospheric pressure, sequentially performing an accelerator stepping-on-accelerator stepping-off test under different gears, and performing integral parameter correction on transient speed overspeed points of the supercharger to obtain integral correction parameters under each transient speed overspeed point;
each transient speed overspeed point corresponds to an engine operating point, and each engine operating point comprises an engine speed and a speed change rate.
With reference to the first aspect, in an implementation manner, before the obtaining the correction coefficient of the integral correction parameter according to the current atmospheric pressure, the method further includes:
and obtaining a correction coefficient curve under different prestarted atmospheric pressures.
With reference to the first aspect, in one embodiment, the calibrating the correction coefficient curve under different atmospheric pressures specifically includes:
setting a correction coefficient at the reference atmospheric pressure as 1, and setting a plurality of calibration air pressures;
and respectively carrying out a tipin-tipout test under different gears in sequence under each calibration air pressure, carrying out coefficient correction on integral correction parameters of transient speed overspeed points of the supercharger to obtain correction coefficients under each transient speed overspeed point, and taking the maximum correction coefficient as the correction coefficient under the corresponding calibration air pressure.
With reference to the first aspect, in an implementation manner, the obtaining the current required boost pressure of the engine specifically includes:
acquiring a first engine demand charge according to the engine speed and the accelerator opening based on a first engine demand charge pulse spectrum under different preset speeds and accelerator opening;
acquiring a second engine demand charge according to the engine speed and the atmospheric pressure based on a second engine demand charge pulse spectrum at different preset speeds and the atmospheric pressure;
taking the smaller of the first and second engine demand charges as the current demand charge of the engine;
the product of the current demand charge and the charge pressure conversion coefficient of the engine is taken as the demand boost pressure.
In a second aspect, an embodiment of the present application provides a turbocharger transient protection control device, where the turbocharger transient protection control device includes:
the first acquisition module is used for acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine and the current atmospheric pressure;
the second acquisition module is used for acquiring control parameters of PID control of the waste gate bypass electromagnetic valve of the supercharger according to the supercharging pressure difference between the required supercharging pressure and the actual supercharging pressure;
the third acquisition module is used for acquiring integral correction parameters of integral parameters in the control parameters according to the rotating speed and the rotating speed change rate;
a fourth acquisition module for acquiring the correction coefficient of the integral correction parameter according to the current atmospheric pressure;
and the correction module is used for correcting the integral parameter according to the integral correction parameter and the correction coefficient.
With reference to the second aspect, in one embodiment, the correction module includes:
a calculation sub-module for obtaining the product of the integral correction parameter and the correction coefficient;
and the correction submodule is used for taking the sum of the product and the integral parameter as a corrected integral parameter.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
the method comprises the steps of obtaining the current required boost pressure, the actual boost pressure, the current rotating speed and the rotating speed change rate of an engine and the atmospheric pressure when the engine is operated, further obtaining control parameters of PID control of a waste gate bypass electromagnetic valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure, obtaining integral correction parameters of integral parameters in the control parameters according to the rotating speed and the rotating speed change rate, obtaining correction coefficients of the integral correction parameters according to the current atmospheric pressure, and then correcting the integral parameters according to the integral correction parameters and the correction coefficients so as to ensure that the rotating speed of the supercharger has no overspeed risk even if the load is changed in a transient state when the engine is operated in different environments, and further solving the technical problem of supercharger damage caused by transient overspeed risk of the supercharger due to the load transient state change in the related art.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for transient protection control of a supercharger according to the present application;
fig. 2 is a flow chart of another embodiment of the method for controlling transient protection of a supercharger according to the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which 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 those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the foregoing drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The terms "first," "second," and "third," etc. are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order, and are not limited to the fact that "first," "second," and "third" are not identical.
In describing embodiments of the present application, "exemplary," "such as," or "for example," etc., are used to indicate by way of example, illustration, or description. Any embodiment or design described herein as "exemplary," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and furthermore, in the description of the embodiments of the present application, "plural" means two or more than two.
In some of the processes described in the embodiments of the present application, a plurality of operations or steps occurring in a particular order are included, but it should be understood that the operations or steps may be performed out of the order in which they occur in the embodiments of the present application or in parallel, the sequence numbers of the operations merely serve to distinguish between the various operations, and the sequence numbers themselves do not represent any order of execution. In addition, the processes may include more or fewer operations, and the operations or steps may be performed in sequence or in parallel, and the operations or steps may be combined.
In a first aspect, an embodiment of the present application provides a method for controlling transient protection of a supercharger.
As shown in fig. 1, the method for controlling transient protection of a supercharger includes the steps of:
s1, acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine and the current atmospheric pressure.
S2, obtaining control parameters of PID control of the waste gate bypass solenoid valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure.
The control parameters of the PID control comprise a proportional parameter, an integral parameter and a differential parameter.
S3, acquiring integral correction parameters of integral parameters in the control parameters according to the rotating speed and the rotating speed change rate.
S4, acquiring a correction coefficient of the integral correction parameter according to the current atmospheric pressure.
The current atmospheric pressure, the required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine during operation can be acquired or calculated through corresponding sensors.
S5, correcting the integral parameter according to the integral correction parameter and the correction coefficient.
Alternatively, the order of the above-described step S2, step S3, and step S4 may be exchanged. Alternatively, in other embodiments, the above steps S2, S3 and S4 may be performed simultaneously.
According to the control method, the current required boost pressure, the actual boost pressure, the current rotating speed and the rotating speed change rate of the engine and the atmospheric pressure when the engine is currently operated are obtained, further, the control parameter of the PID control of the waste gate bypass solenoid valve of the supercharger is obtained according to the boost pressure difference between the required boost pressure and the actual boost pressure, the integral correction parameter of the integral parameter in the control parameter is obtained according to the rotating speed and the rotating speed change rate, the correction coefficient of the integral correction parameter is obtained according to the current atmospheric pressure, and then, the integral parameter can be corrected according to the integral correction parameter and the correction coefficient, so that when the engine is operated in different environments, even if the load transient changes, the rotating speed of the supercharger does not have overspeed risk, and the technical problem that the supercharger is damaged due to the transient overspeed risk of the load transient change in the related technology is solved.
Further, in an embodiment, the step S5 corrects the integral parameter according to the integral correction parameter and the correction coefficient, and specifically includes the following steps:
first, the product of the integral correction parameter and the correction coefficient is obtained.
Then, the sum of the product and the integral parameter is taken as the integral parameter after correction.
Further, in an embodiment, after taking the sum of the product and the integral parameter as the corrected integral parameter, the method further includes the following steps:
and obtaining the driving duty ratio of the supercharger waste gate solenoid valve according to the supercharging pressure difference, the proportional parameter, the derivative parameter and the corrected integral parameter of the control parameter.
Optionally, when the proportional parameter, the derivative parameter and the corrected integral parameter of the PID controller are obtained, the proportional control duty cycle, the derivative control duty cycle and the integral control duty cycle can be output according to the supercharging pressure difference, so that the drive duty cycle of the supercharger waste gate solenoid valve is obtained by summing the proportional control duty cycle, the derivative control duty cycle and the integral control duty cycle.
In the embodiment, the integral parameters are corrected through the integral correction parameters and the correction coefficients, so that the duty ratio of the waste gas bypass electromagnetic valve is obtained according to the corrected integral parameters, and the speed overrun risk of the supercharger caused by the overshoot of the supercharging pressure in the transient acceleration and deceleration process when the steady-state supercharger has no overspeed risk can be effectively avoided.
Further, before the obtaining the integral correction parameter of the integral parameter in the control parameters according to the rotation speed and the rotation speed change rate, the method further includes:
and obtaining integral correction parameter pulse spectrums under different pre-calibrated rotating speeds and rotating speed change rates.
In this embodiment, the calibrating the integral correction parameter pulse spectrum under different rotation speeds and rotation speed change rates specifically includes the following steps:
first, a reference atmospheric pressure is set.
And then, under the reference atmospheric pressure, sequentially performing a sudden accelerator stepping tipin-sudden accelerator loosening tipout test under different gears, and performing integral parameter correction on transient speed overspeed points of the supercharger so as to reduce the speed of the supercharger to a speed not exceeding a preset speed threshold value, thereby obtaining integral correction parameters under each transient speed overspeed point.
Each transient speed overspeed point corresponds to an engine operating point, and each engine operating point comprises an engine speed and a speed change rate.
And finally, forming an integral correction parameter pulse spectrum under different rotating speeds and rotating speed change rates based on integral correction parameters corresponding to the different rotating speeds and rotating speed change rates.
Further, before the obtaining the correction coefficient of the integral correction parameter according to the current atmospheric pressure, the method further includes:
and obtaining a correction coefficient curve under different prestarted atmospheric pressures.
In this embodiment, the calibration of the correction coefficient curves under different atmospheric pressures specifically includes the following steps:
first, a correction coefficient at the reference atmospheric pressure is set to 1, and a plurality of target atmospheric pressures different from the reference atmospheric pressure are set. Alternatively, the plurality of target pressures are each greater than the reference atmospheric pressure, or a portion of the target pressures are greater than the reference atmospheric pressure and another portion of the target pressures are less than the reference atmospheric pressure.
And then, respectively carrying out a tipin-tipout test under different gears in sequence under each calibration air pressure, and carrying out coefficient correction on integral correction parameters of transient speed overspeed points of the supercharger so as to reduce the speed of the supercharger to a speed threshold value which does not exceed the preset speed threshold value, so as to obtain correction coefficients under each transient speed overspeed point, and taking the maximum correction coefficient as the correction coefficient under the corresponding calibration air pressure.
And finally, obtaining a correction coefficient curve under different atmospheric pressures based on the correction coefficients corresponding to different calibration air pressures.
In this embodiment, different altitude calibration points, i.e., different atmospheric pressure calibration points, may be defined according to different model requirements. In this embodiment, with the reference atmospheric pressure being c, the plurality of calibration pressures are atmospheric pressure a and atmospheric pressure b smaller than c, and atmospheric pressure d and atmospheric pressure e larger than c, respectively.
And when the integral correction parameter pulse spectrum is acquired, transient supercharger protection calibration is carried out under the reference atmospheric pressure c. The method comprises the steps of performing a tipin-tipout test under different gears, performing I integral correction on transient speed overspeed points of the supercharger, and reducing the speed of the supercharger to obtain integral correction parameters under each transient speed overspeed point. And finally, filling the integral correction parameters of different rotation speeds and rotation speed change rates into the map to obtain an integral correction parameter pulse spectrum.
When the correction coefficient curve is obtained, a correction coefficient at the reference atmospheric pressure c is defined as 1, namely, the correction coefficient is used as a reference for integrating the correction parameter pulse spectrum, so that coefficient correction is carried out on other altitudes on the basis.
Specifically, first, under the atmospheric pressure a, a tipin-tipout test is sequentially carried out under different gears, and the coefficient of the integral correction parameter of the transient speed overspeed point of the supercharger is corrected to reduce the speed of the supercharger, so as to obtain the correction coefficient of each transient speed overspeed point. Further, the maximum value of the correction coefficients is used as the correction coefficient at the atmospheric pressure a.
And then, under the atmospheric pressure b, sequentially performing a tipin-tipout test under different gears, and correcting the coefficient of the integral correction parameter of the transient speed overspeed point of the supercharger so as to reduce the speed of the supercharger and obtain the correction coefficient of each transient speed overspeed point. Further, the maximum value of the correction coefficients is used as the correction coefficient at the atmospheric pressure b.
Similarly, a correction coefficient at the atmospheric pressure d and a correction coefficient at the atmospheric pressure e are obtained, respectively.
At this time, the final correction coefficient curve can be obtained from the correction coefficient corresponding to the atmospheric pressure a, the correction coefficient corresponding to the atmospheric pressure b, the correction coefficient 1 corresponding to the atmospheric pressure c, the correction coefficient corresponding to the atmospheric pressure d, and the correction coefficient corresponding to the atmospheric pressure e.
In this embodiment, the integral correction parameter pulse spectrums of the correction coefficient curves curve and the integral of the I term correspond to the correction requirements of the integral of the supercharger control I term under different transient situations at different altitudes, so as to realize that the transient rotation speed of the supercharger does not exceed the preset rotation speed threshold of the supercharger. The preset rotation speed threshold value can be defined according to the requirements of different models.
Further, in the step S1, the current required boost pressure of the engine is obtained, which specifically includes the following steps:
first, based on a first engine demand charge pulse spectrum under different preset rotation speeds and accelerator opening degrees, a first engine demand charge is obtained according to the rotation speeds of the engine and the accelerator opening degrees.
Second, a second engine demand charge is obtained from the engine speed and the barometric pressure based on a second engine demand charge pulse spectrum at a preset different speed and barometric pressure.
Then, taking the smaller of the first and second engine demand charges as the current demand charge of the engine;
finally, the product of the current desired charge of the engine and the charge pressure conversion coefficient is used as the desired boost pressure.
In some embodiments, the required boost pressure can be obtained according to the required charge, and the output Kp, ki and Kd are calculated by means of the PID controller according to the pressure deviation between the required boost pressure and the actual boost pressure, so as to obtain the duty ratio of the waste gate solenoid valve, and control the booster bleed valve to realize closed-loop control of the boost pressure. On the plateau, the demand charge is limited by the atmospheric pressure, so that the demand boost pressure is limited, and the purpose of limiting the rotation speed of the supercharger to protect the supercharger is realized.
However, because the responsiveness of the boost pressure of the gas engine directly determines the acceleration performance of the engine, when the control calibration of the supercharger is performed, in order to ensure the dynamic responsiveness of the engine, larger Kp and Ki are generally used to ensure the acceleration capability, when the actual boost pressure in the acceleration process is smaller than the required boost pressure, the Ki integral is accumulated, after the actual boost pressure is larger than the required boost pressure, the Ki integral is gradually reduced again, so as to reduce the out-of-tolerance, and the risk of overshoot of the boost pressure and overspeed of the supercharger exists when the transient acceleration and deceleration are caused by the adjustment lag of the Ki integral. There is a need to sacrifice steady state supercharger performance at altitude to address transient supercharger overspeed risks, by limiting more charge to achieve transient non-overspeed goals.
As shown in fig. 2, the control method of the present embodiment includes:
A1. based on the rotation speed N and the accelerator opening A of the gas engine, a first engine demand charge pulse spectrum M of the engine under different working conditions is established rlsol The abscissa of the pulse spectrum is the rotating speed N, the ordinate is the accelerator opening A, and the pulse spectrum value represents the engine demand charge rlsol of the corresponding working condition;
A2. based on the rotation speed N of the gas engine and the atmospheric pressure P (corresponding to different altitudes), a second engine demand charge pulse spectrum M of the engine under different atmospheric pressures is established rlp The abscissa of the pulse spectrum is the rotating speed N, the ordinate is the atmospheric pressure P, and the pulse spectrum value represents the engine demand charge rl corresponding to the altitude p As a charge limitation;
A3. will berlsol and rl p Comparing, taking a smaller value as the current demand charge output of the engine;
A4. converting the current required charge of the engine into required boost pressure through a charge pressure conversion coefficient, and then, differentiating the required boost pressure from the actual boost pressure to obtain a boost pressure difference delta P between the current required boost pressure and the actual boost pressure;
A5. according to the boost pressure difference delta P between the current required boost pressure and the actual boost pressure, and then according to the control adjustment of the PID controller, the proportional parameter Kp, the integral parameter Ki and the differential parameter Kd of the current required supercharger waste gate valve control can be obtained;
A6. based on the rotation speed N and the rotation speed change rate Dn of the gas engine, an integral correction parameter pulse spectrum M controlled by a supercharger waste gate solenoid valve Ki of the gas engine under different rotation speeds and rotation speed change rates is established LKi The abscissa of the pulse spectrum is the rotation speed change rate Dn, the ordinate is the rotation speed N, and the pulse spectrum value represents the integral correction parameter Ld of Ki integral of the corresponding working condition Ki_map ；
A7. Obtaining correction coefficient fac of integral correction parameter under different altitudes through curve based on atmospheric pressure (different altitudes) p The method comprises the steps of carrying out a first treatment on the surface of the Correction coefficient and integral correction parameter pulse spectrum value Ld under current working condition Ki_map Multiplying to obtain final Ki correction value Ld Ki The correction value is added to the Ki integral output by the PID controller to correct the I term, and finally the I term is output to the duty ratio of the waste gate solenoid valve.
In the present embodiment, the correction coefficient fac obtained from the atmospheric pressure is calculated p Integral correction parameter Ld corresponding to I term under the working condition Ki_map Integral correction Ld obtained by multiplication Ki And adding the integral value to the integral value I to limit the supercharger when the transient working condition is reached, thereby reducing the risk of transient overspeed of the supercharger.
In a second aspect, the embodiment of the application further provides a transient protection control device for the supercharger. The transient protection control device of the supercharger comprises a first acquisition module, a second acquisition module, a third acquisition module, a fourth acquisition module and a correction module.
The first acquisition module is used for acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine. The first acquisition module is further used for acquiring the current atmospheric pressure.
The second obtaining module is used for obtaining control parameters of PID control of the waste gate bypass solenoid valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure.
And the third acquisition module is used for acquiring an integral correction parameter of the integral parameters in the control parameters according to the rotating speed and the rotating speed change rate.
And the fourth acquisition module is used for acquiring the correction coefficient of the integral correction parameter according to the current atmospheric pressure.
The correction module is used for correcting the integral parameter according to the integral correction parameter and the correction coefficient.
Further, in an embodiment, the correction module includes a calculation sub-module and a correction sub-module.
The calculation submodule is used for obtaining the product of the integral correction parameter and the correction coefficient.
The correction submodule is used for taking the sum of the product and the integral parameter as the integral parameter after correction.
Further, in an embodiment, the first obtaining module includes a comparing sub-module and an obtaining sub-module.
The comparison sub-module is used for acquiring a first engine demand charge according to the engine speed and the accelerator opening based on a first engine demand charge pulse spectrum under the preset different speeds and the accelerator opening, and acquiring a second engine demand charge according to the engine speed and the atmospheric pressure based on a second engine demand charge pulse spectrum under the preset different speeds and the atmospheric pressure; and is further configured to compare the first and second engine demand charges and take a smaller value of the first and second engine demand charges as a current demand charge for the engine.
The acquisition sub-module is configured to take a product of a current desired charge of the engine and a charge pressure conversion coefficient as the desired boost pressure.
Further, the transient protection control device of the supercharger further comprises a fifth acquisition module, wherein the fifth acquisition module is used for acquiring the integral correction parameter pulse spectrum under different pre-calibrated speeds and speed change rates and the correction coefficient curve under different pre-calibrated atmospheric pressures.
The transient protection control device for the supercharger is suitable for the transient protection control method for each supercharger, and based on the integral correction curve of the supercharging control Ki of the engine at different altitudes and the integral correction parameter pulse spectrum of the I control based on the rotation speed and the rotation speed change rate of the engine, the final correction coefficient of the supercharger I control can be obtained, and the Ki output by the PID controller of the supercharger is further subjected to integral correction, so that the overspeed risk of the supercharger caused by the overshoot of the supercharging pressure in the transient acceleration and deceleration process when the steady-state supercharger does not have overspeed risk is avoided, and the overspeed risk of the supercharger when the load transient change of the engine in the plateau operation is ensured.
The function implementation of each module in the supercharger transient protection control device corresponds to each step in the supercharger transient protection control method embodiment, and the function and implementation process of each module are not described in detail herein. It should be noted that, the foregoing reference numerals of the embodiments of the present application are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A supercharger transient protection control method, characterized in that the supercharger transient protection control method comprises:
acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine and the current atmospheric pressure;
acquiring control parameters of PID control of a waste gate bypass electromagnetic valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure;
acquiring an integral correction parameter of an integral parameter in the control parameters according to the rotating speed and the rotating speed change rate;
acquiring a correction coefficient of the integral correction parameter according to the current atmospheric pressure;
and correcting the integral parameter according to the integral correction parameter and the correction coefficient.
2. The supercharger transient protection control method of claim 1, wherein correcting the integral parameter according to the integral correction parameter and correction coefficient comprises:
obtaining the product of the integral correction parameter and the correction coefficient;
and taking the sum of the product and the integral parameter as a corrected integral parameter.
3. The supercharger transient protection control method of claim 2, further comprising, after taking the sum of the product and the integral parameter as a corrected integral parameter:
and obtaining the driving duty ratio of the supercharger waste gate solenoid valve according to the supercharging pressure difference, the proportional parameter, the derivative parameter and the corrected integral parameter of the control parameter.
4. The supercharger transient protection control method of claim 1, wherein before obtaining the integral correction parameter of the integral parameters in the control parameters according to the rotation speed and the rotation speed change rate, further comprising:
and obtaining integral correction parameter pulse spectrums under different pre-calibrated rotating speeds and rotating speed change rates.
5. The method for transient protection control of a supercharger of claim 4 wherein calibrating the integral correction parameter pulse spectrum at different speeds and rates of change of speed comprises:
setting a reference atmospheric pressure;
under the reference atmospheric pressure, sequentially performing an accelerator stepping-on-accelerator stepping-off-accelerator stepping-on test under different gears, and performing integral parameter correction on transient speed overspeed points of the supercharger to obtain integral correction parameters under each transient speed overspeed point;
each transient speed overspeed point corresponds to an engine operating point, and each engine operating point comprises an engine speed and a speed change rate.
6. The supercharger transient protection control method of claim 5, wherein prior to obtaining the correction coefficient of the integral correction parameter based on the current atmospheric pressure, further comprising:
and obtaining a correction coefficient curve under different prestarted atmospheric pressures.
7. The method for transient protection control of a supercharger of claim 6 wherein calibrating the correction factor curves at different atmospheres comprises:
setting a correction coefficient at the reference atmospheric pressure as 1, and setting a plurality of calibration air pressures;
and respectively carrying out a tipin-tipout test under different gears in sequence under each calibration air pressure, carrying out coefficient correction on integral correction parameters of transient speed overspeed points of the supercharger to obtain correction coefficients under each transient speed overspeed point, and taking the maximum correction coefficient as the correction coefficient under the corresponding calibration air pressure.
8. The method for transient protection control of a supercharger according to claim 1, wherein the obtaining the current required boost pressure of the engine comprises:
acquiring a first engine demand charge according to the engine speed and the accelerator opening based on a first engine demand charge pulse spectrum under different preset speeds and accelerator opening;
acquiring a second engine demand charge according to the engine speed and the atmospheric pressure based on a second engine demand charge pulse spectrum at different preset speeds and the atmospheric pressure;
taking the smaller of the first and second engine demand charges as the current demand charge of the engine;
the product of the current demand charge and charge pressure conversion coefficient of the engine is taken as the demand boost pressure.
9. A supercharger transient protection control device, characterized in that it comprises:
the first acquisition module is used for acquiring the current required boost pressure, the actual boost pressure, the rotating speed and the rotating speed change rate of the engine and the current atmospheric pressure;
the second acquisition module is used for acquiring control parameters of PID control of the waste gate bypass electromagnetic valve of the supercharger according to the boost pressure difference between the required boost pressure and the actual boost pressure;
the third acquisition module is used for acquiring integral correction parameters of integral parameters in the control parameters according to the rotating speed and the rotating speed change rate;
a fourth acquisition module for acquiring a correction coefficient of the integral correction parameter according to the current atmospheric pressure;
and the correction module is used for correcting the integral parameter according to the integral correction parameter and the correction coefficient.
10. The supercharger transient protection control device of claim 9, wherein the correction module comprises:
a calculation sub-module for obtaining the product of the integral correction parameter and the correction coefficient;
and the correction submodule is used for taking the sum of the product and the integral parameter as a corrected integral parameter.
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| CN202311282915.1A CN117072306A (en) | 2023-09-28 | 2023-09-28 | Supercharger transient protection control method and device |
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| CN202311282915.1A CN117072306A (en) | 2023-09-28 | 2023-09-28 | Supercharger transient protection control method and device |
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