CN114738121A - Control method of engine control system - Google Patents
Control method of engine control system Download PDFInfo
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- CN114738121A CN114738121A CN202210574435.1A CN202210574435A CN114738121A CN 114738121 A CN114738121 A CN 114738121A CN 202210574435 A CN202210574435 A CN 202210574435A CN 114738121 A CN114738121 A CN 114738121A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008859 change Effects 0.000 claims description 17
- 239000000110 cooling liquid Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 10
- 230000014509 gene expression Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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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
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of engines, and discloses a control method of an engine control system. The first acquisition module is arranged at the inlet end of the supercharger, the actual pre-vortex pressure value of the supercharger can be acquired in real time, the target opening value of the exhaust throttle valve is calculated according to the operation information of the engine, the operation condition of the engine and the actual pre-vortex pressure value, the delay time of the exhaust throttle valve on exhaust temperature control can be reduced, and the situation that the exhaust temperature is controlled too high or too low due to the consistency deviation of the exhaust throttle valve is avoided. The control method of the engine control system realizes accurate control and quick response of exhaust temperature, can meet the use requirements of SCR and DPF in an engine post-treatment system, avoids severe fluctuation of the pressure of a supercharger of an engine before vortex, and can improve the reliability of a supercharger assembly and a related sealing gasket.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method of an engine control system.
Background
At present, the exhaust gas of the engine of the automobile is usually treated by an after-treatment device so as to reduce the pollution of harmful gas in the exhaust gas to the air.
The prior art generally controls engine exhaust temperature via an exhaust throttle open loop control method to bring exhaust after aftertreatment to engine emission standards. However, due to the consistency deviation of the exhaust throttle valve, the actual opening degree of the exhaust throttle valve is often different under the same target control opening degree, resulting in different exhaust temperature rise effects. If the exhaust temperature is controlled too high, the fuel consumption of the engine is affected, and even the aging of an after-processor is accelerated. Too low exhaust temperature control can result in excessive NOx emissions, increased risk of urea crystallization, and failure of DPF regeneration.
In addition, in the whole vehicle running process, the engine is in a transient working condition, the opening of the exhaust throttle valve can be changed rapidly according to the transient working condition, the exhaust throttle valve can be opened or closed suddenly, pressure fluctuation before vortex of the supercharger of the engine is severe, and the reliability of the supercharger assembly and the related sealing gaskets is further influenced.
Therefore, a control method of an engine control system is needed to solve the above problems.
Disclosure of Invention
Based on the above problems, the present invention aims to provide a control method for an engine control system, which can realize accurate control and quick response of exhaust temperature, meet the use requirements of SCR and DPF in an engine post-treatment system, avoid severe pressure fluctuation of an engine supercharger before vortex, and improve the reliability of a supercharger assembly and a related sealing gasket.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method of an engine control system comprises an engine, a supercharger, an exhaust throttle valve, a first acquisition module, a second acquisition module and a relation chart, wherein the first acquisition module is arranged on an exhaust pipe of the engine and is positioned at an inlet end of the supercharger, the first acquisition module is used for acquiring an actual pre-vortex pressure value of the supercharger, the exhaust throttle valve is arranged on the exhaust pipe of the engine and is positioned at an outlet end of the supercharger, and the second acquisition module is used for acquiring running information of the engine;
the control method of the engine control system includes the steps of:
acquiring the running information of the engine through the second acquisition module, and acquiring the running working condition of the engine;
and searching and obtaining corresponding control data information on the relation chart according to the operation information of the engine and the operation working condition of the engine, and calculating and obtaining a target opening value of the exhaust throttle valve according to the control data information and the actual pre-vortex pressure value.
As a preferable mode of the control method of the engine control system of the invention, the control data information includes a feed-forward opening value of the exhaust throttle valve and a feedback opening value of the exhaust throttle valve, and the target opening value is equal to a sum of the feed-forward opening value and the feedback opening value.
As a preferable aspect of the control method of the engine control system of the present invention, the method of calculating the feedforward opening degree value includes the steps of:
acquiring a basic opening value of the exhaust throttle valve, wherein the relation chart comprises a first chart, the running information of the engine comprises rotating speed information and oil quantity information, and the basic opening value is obtained by searching the first chart according to the rotating speed information and the oil quantity information;
acquiring a corrected opening value of the exhaust throttle valve, wherein the relation chart further comprises a second chart, the operation information of the engine further comprises cooling liquid temperature information, atmospheric pressure information and atmospheric temperature information, and the corrected opening value is obtained by searching and calculating the second chart according to the rotating speed information, the oil quantity information, the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information;
the feed-forward opening value is equal to a sum of the base opening value and the corrected opening value.
As a preferable aspect of the control method of the engine control system of the invention, the corrected opening value is equal to a product of a corrected base opening value of the exhaust throttle valve and an opening correction factor of the exhaust throttle valve;
and the second graph comprises a first correction table and a second correction table, the correction basic opening degree value is obtained by searching the first correction table according to the rotating speed information and the oil amount information, and the opening degree correction factor is obtained by searching the second correction table according to the coolant temperature information, the atmospheric pressure information and the atmospheric temperature information.
As a preferable aspect of the control method of the engine control system of the present invention, the feedback opening degree value is obtained by calculation using a PID algorithm, and the calculation method includes the steps of:
obtaining a P control parameter Kp, an I control parameter Ki and a D control parameter Kd of the PID algorithm according to the operation information of the engine and the target output value of the preswirl pressure of the supercharger;
the relation graph further comprises a third graph, the operation information of the engine comprises rotating speed information and oil quantity information, and Kp, Ki and Kd are obtained by searching and calculating on the third graph according to the rotating speed information, the oil quantity information and the pre-vortex pressure target output value;
obtaining a P control output value, an I control output value and a D control output value of the PID algorithm according to the target output value of the vortex front pressure, the actual vortex front pressure value, Kp, Ki and Kd;
the feedback opening value is equal to the sum of the P control output value, the I control output value and the D control output value.
As a preferable aspect of the control method of the engine control system of the invention, the pre-vortex pressure target output value of the supercharger is equal to the sum of the pre-vortex pressure basic target value of the supercharger and the pre-vortex pressure correction value of the supercharger;
the third diagram comprises a first diagram and a second diagram, the basic target value of the pre-vortex pressure is obtained by searching the first diagram according to the rotating speed information and the oil quantity information, the operation information of the engine further comprises coolant temperature information, atmospheric pressure information and atmospheric temperature information, and the corrected value of the pre-vortex pressure is obtained by searching and calculating the second diagram according to the rotating speed information, the oil quantity information, the coolant temperature information, the atmospheric pressure information and the atmospheric temperature information;
the pre-vortex pressure correction value is equal to the product of a pre-vortex pressure correction base value of the supercharger and a pre-vortex pressure correction factor of the supercharger;
the second chart comprises a third correction table and a fourth correction table, the vortex front pressure correction base value is obtained by searching the third correction table according to the rotating speed information and the oil amount information, and the vortex front pressure correction factor is obtained by searching the fourth correction table according to the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information.
As a preferable embodiment of the control method of the engine control system of the present invention, Kp is equal to the product of Kp base value and Kp correction factor, Ki is equal to the product of Ki base value and Ki correction factor, and Kd is equal to the product of Kd base value and Kd correction factor;
taking the target output value of the pre-vortex pressure as a target pre-vortex pressure value of the exhaust throttle valve, and defining the difference value between the target pre-vortex pressure value and the actual pre-vortex pressure value as De;
the third diagram further comprises a third diagram and a fourth diagram, the Kp basic value, the Ki basic value and the Kd basic value are obtained by searching on the third diagram according to the rotating speed information and the oil quantity information, and the Kp correction factor, the Ki correction factor and the Kd correction factor are obtained by searching on the fourth diagram according to De;
the P control output value, the I control output value and the D control output value satisfy the following relational expression:
the P control output value is DexKp;
the I control output value is DexKi;
d control output value ═ De (n) (De) (n-1) ] × Kp, n represents the number of cycles.
As a preferable aspect of the control method of the engine control system according to the present invention, a relationship between the opening degree of the exhaust throttle valve and the actual preswirl pressure of the supercharger is linearized, an intermediate variable flow (x) is introduced, the opening degree of the exhaust throttle valve is defined as ETVpos, the actual preswirl pressure of the supercharger is P _ ETVpos, and flow (x) satisfies the following relational expression:
Flow(x)＝[P_(ETVpos_0)-P_(ETVpos_x)]/[P_(ETVpos_0)-P_(ETVpos_100)]×100。
as a preferable mode of the control method of the engine control system according to the present invention, the relationship chart further includes a chart four, the engine operation information includes rotation speed information and oil amount information, a maximum opening value and a minimum opening value of the exhaust throttle valve are found and obtained on the chart four according to the rotation speed information and the oil amount information, and the target opening value of the exhaust throttle valve is located between the maximum opening value and the minimum opening value.
As a preferable aspect of the control method of the engine control system according to the present invention, the relationship table further includes a table five, the engine operation information includes rotation speed information and oil amount information, a maximum rate of change value and a minimum rate of change value of the exhaust throttle valve switch are found and obtained on the table five according to the rotation speed information and the oil amount information, and the opening/closing rate of change of the exhaust throttle valve is located between the maximum rate of change value and the minimum rate of change value.
The beneficial effects of the invention are as follows:
according to the control method of the engine control system, the first acquisition module is arranged at the inlet end of the supercharger, the actual pre-vortex pressure value of the supercharger can be acquired in real time, the target opening value of the exhaust throttle valve is calculated and obtained according to the operation information of the engine, the operation working condition of the engine and the actual pre-vortex pressure value, the delay time of the exhaust throttle valve on the exhaust temperature control can be reduced, and the situation that the exhaust temperature is controlled too high or too low due to the consistency deviation of the exhaust throttle valve is avoided. The control method of the engine control system realizes accurate control and quick response of exhaust temperature, can meet the use requirements of SCR and DPF in an engine post-treatment system, avoids severe fluctuation of the pressure of a supercharger of an engine before vortex, and can improve the reliability of a supercharger assembly and a related sealing gasket.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic block diagram of an engine control system according to an embodiment of the present invention;
FIG. 2 is a graph of the relationship between the pressure at the front of the vortex and the temperature of the exhaust gas of a supercharger according to an embodiment of the present invention;
FIG. 3 is a control flow diagram of an engine control system according to an embodiment of the present invention;
FIG. 4 is a graph of exhaust throttle opening versus actual pre-turbo pressure of the supercharger provided by the present invention;
FIG. 5 is a graph of exhaust throttle opening versus an intermediate variable flow (x) provided by the present invention;
fig. 6 is a graph showing the relationship between the intermediate variable flow (x) and the actual preswirl pressure of the supercharger according to the present invention.
In the figure:
1. an engine; 2. a supercharger; 3. an exhaust throttle valve; 4. a first acquisition module; 5. an intercooler; 6. and a post processor.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
As shown in fig. 1, the present embodiment provides a control method of an engine control system, where the engine control system includes an engine 1, a supercharger 2, an exhaust throttle valve 3, a first collecting module 4, a second collecting module and a relationship chart, the first collecting module 4 is disposed on an exhaust pipe of the engine 1 and located at an inlet end of the supercharger 2, the first collecting module 4 is configured to collect an actual pre-vortex pressure value of the supercharger 2, the exhaust throttle valve 3 is disposed on the exhaust pipe of the engine 1 and located at an outlet end of the supercharger 2, and the second collecting module is configured to collect operation information of the engine 1.
The control method of the engine control system includes the steps of:
s1, acquiring the operation information of the engine 1 through a second acquisition module, and acquiring the operation condition of the engine 1;
and S2, searching and obtaining corresponding control data information on the relation chart according to the operation information of the engine 1 and the operation condition of the engine 1, and calculating and obtaining a target opening value of the exhaust throttle valve 3 according to the control data information and the actual pre-vortex pressure value.
Further, referring to fig. 1, the engine control system further includes an after intercooler 5 and a processor 6, the intercooler 5 is located between the engine 1 and the supercharger 2 and is used for reducing the temperature of the supercharged high-temperature air so as to reduce the heat load of the engine 1 and improve the air intake amount, thereby increasing the power of the engine 1. The post-processor 6 is installed on the exhaust pipe of the engine 1 and located downstream of the exhaust throttle valve 3, and an oxidation type catalytic converter, a particulate trap DPF, and a rear-stage selective catalytic reduction SCR + ammonia slip catalyst ASC (not shown) are provided in the post-processor 6 for processing the exhaust gas and ensuring that the exhaust gas meets the environmental requirements.
According to the control method of the engine control system provided by the embodiment, the first acquisition module 4 is arranged at the inlet end of the supercharger 2, the actual pre-vortex pressure value of the supercharger 2 can be acquired in real time, the target opening value of the exhaust throttle valve 3 is calculated and obtained according to the operation information of the engine 1, the operation condition of the engine 1 and the actual pre-vortex pressure value, the delay time of the exhaust throttle valve 3 for controlling the exhaust temperature can be reduced, and the situation that the exhaust temperature is controlled too high or too low due to the consistency deviation of the exhaust throttle valve 3 is avoided. The control method of the engine control system realizes accurate control and quick response of exhaust temperature, can meet the use requirements of SCR and DPF in an engine 1 post-treatment system, avoids severe fluctuation of the preswirl pressure of a supercharger 2 of the engine 1, and can improve the reliability of a supercharger assembly and a related sealing gasket.
Preferably, the first collecting module 4 of the present embodiment is a pressure sensor, and the pressure sensor is disposed at the inlet end of the supercharger 2, so that the measurement of the preswirl pressure value of the supercharger 2 is more stable, and the accurate control of the exhaust throttle valve 3 on the exhaust temperature can be realized. Meanwhile, the arrangement of the pressure sensor at the inlet end of the supercharger 2 is easier to realize, and the pressure acquisition technology is more mature.
In step S1, the operation information of the engine 1 collected by the second collection module includes, but is not limited to, the rotational speed, torque, fuel injection amount, atmospheric temperature, atmospheric pressure, coolant temperature, opening degree of the exhaust throttle valve 3, and the like of the engine 1. The obtained operation conditions of the engine 1 include, but are not limited to, operation conditions of universal characteristics, WHTC cycle, WHSC cycle, DPF regeneration, and the like. As shown in fig. 2, there is an approximately linear proportional relationship between the pre-vortex pressure and the exhaust temperature under different engine 1 operating conditions, so that accurate control of the exhaust temperature can be achieved by accurately controlling the actual pre-vortex pressure of the supercharger 2 in a closed loop.
In step S2, the control data information includes a feedforward opening value of the exhaust throttle valve 3 and a feedback opening value of the exhaust throttle valve 3, and the target opening value of the exhaust throttle valve 3 is equal to the sum of the feedforward opening value of the exhaust throttle valve 3 and the feedback opening value of the exhaust throttle valve 3.
In the present embodiment, the control flow of the engine control system is as shown in fig. 3, and the feedforward opening value of the exhaust throttle valve 3 is obtained by the open-loop control of the exhaust throttle valve 3 according to the collected operation information of the engine 1, and the feedback opening value of the exhaust throttle valve 3 is obtained by the closed-loop control of the exhaust throttle valve 3 according to the collected operation information of the engine 1 and the actual preswirl pressure value of the supercharger 2.
The method for calculating the feedforward opening value of the exhaust throttle valve 3 includes the following steps:
s21, acquiring a basic opening value of the exhaust throttle valve 3;
s22, acquiring a corrected opening value of the exhaust throttle valve 3;
s23, the feedforward opening value is equal to the sum of the basic opening value and the correction opening value.
In step S21, the operation information of the engine 1 includes rotation speed information and oil amount information, and the map includes a first map on which the basic opening value of the exhaust throttle valve 3 is found based on the rotation speed information and the oil amount information. In this embodiment, the first map is a two-dimensional map (the X axis is the rotation speed, and the Y axis is the oil amount), and the basic opening value of the exhaust throttle valve 3 corresponding to the state can be found by searching the two-dimensional map according to the obtained rotation speed and oil amount.
In step S22, the operation information of the engine 1 further includes coolant temperature information, atmospheric pressure information, and atmospheric temperature information, and the relationship chart further includes a second chart on which the corrected opening value of the exhaust throttle valve 3 is found and calculated based on the rotational speed information, the oil amount information, the coolant temperature information, the atmospheric pressure information, and the atmospheric temperature information.
Further, in step S22, the corrected opening value is equal to the product of the corrected base opening value of the exhaust throttle valve 3 and the opening correction factor of the exhaust throttle valve 3. The second graph comprises a first correction table and a second correction table, a correction basic opening degree value can be obtained by searching on the first correction table according to the rotating speed information and the oil quantity information, and an opening degree correction factor can be obtained by searching on the second correction table according to the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information.
In the present embodiment, the atmospheric pressure information is taken as an example, the first correction table is a two-dimensional map correction table (X-axis is the rotational speed, Y-axis is the oil amount), and the second correction table is a one-dimensional correction factor table (X-axis is the atmospheric pressure). The corrected basic opening value of the exhaust throttle valve 3 corresponding to the state can be inquired on the two-dimensional map correction chart by inputting the rotation speed information and the oil amount information, the opening correction factor can be inquired on the one-dimensional correction factor chart by inputting the atmospheric pressure information, and the final corrected opening value can be obtained by multiplying the corrected basic opening value by the opening correction factor. The coolant temperature information and the atmospheric temperature information are calculated by the same correction method as the atmospheric pressure information. The first correction table and the second correction table are known relation charts and can be directly called according to corresponding rotating speed information, oil quantity information and the like.
In step S23, the feedforward opening value of the exhaust throttle valve 3 is obtained by adding the calculated base opening value and the corrected opening value. The control process described above is the open-loop control of the exhaust throttle valve 3, and the open-loop control output value of the exhaust throttle valve 3 is used as the feedforward opening value of the closed-loop control of the exhaust throttle valve 3.
Referring to fig. 3, in the present embodiment, the feedback opening degree value of the exhaust throttle valve 3 is calculated by the PID algorithm, and the calculation method includes the steps of:
s24, obtaining a P control parameter Kp, an I control parameter Ki and a D control parameter Kd of a PID algorithm according to the operation information of the engine 1 and the pre-vortex pressure target output value of the supercharger 2;
s25, obtaining a P control output value, an I control output value and a D control output value of a PID algorithm according to the pre-vortex pressure target output value, the actual pre-vortex pressure value, Kp, Ki and Kd;
s26, the feedback opening value of the exhaust throttle valve 3 is equal to the sum of the P control output value, the I control output value, and the D control output value.
The PID controller (also called PID regulator) is controlled according to the proportion (P), integral (I) and differential (D) of the deviation in the process control, has the advantages of simple principle, easy realization, wide application range, mutually independent control parameters, simpler parameter selection and the like, and is an algorithm which not only has simple control industry but also can embody the idea of feedback control.
In step S24, the operation information of the engine 1 includes rotation speed information and oil amount information, and the relationship map further includes a third map on which Kp, Ki, and Kd (as closed-loop control parameters of the exhaust throttle valve 3) are found and calculated based on the rotation speed information, the oil amount information, and the pre-turbine pressure target output value.
Specifically, Kp is equal to the product of the Kp base value and a Kp correction factor, Ki is equal to the product of the Ki base value and a Ki correction factor, and Kd is equal to the product of the Kd base value and a Kd correction factor.
Further, in step S24, the pre-vortex pressure target output value of the supercharger 2 is equal to the sum of the pre-vortex pressure base target value of the supercharger 2 and the pre-vortex pressure correction value of the supercharger 2.
The third graph comprises a first graph and a second graph, the basic target value of the pre-vortex pressure can be searched and obtained on the first graph according to the rotating speed information and the oil quantity information, the operation information of the engine 1 further comprises cooling liquid temperature information, atmospheric pressure information and atmospheric temperature information, and the corrected value of the pre-vortex pressure can be searched and calculated on the second graph according to the rotating speed information, the oil quantity information, the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information.
In the present embodiment, the pre-vortex pressure correction value is equal to the product of the pre-vortex pressure correction base value of the supercharger 2 and the pre-vortex pressure correction factor of the supercharger 2;
the second chart comprises a third correction table and a fourth correction table, a vortex front pressure correction base value can be obtained by searching on the third correction table according to the rotating speed information and the oil quantity information, and a vortex front pressure correction factor can be obtained by searching on the fourth correction table according to the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information. That is, the first table, the third correction table, and the fourth correction table are all known relationship tables, and may be called directly according to the corresponding rotation speed information, the oil amount information, and the like.
In this embodiment, the target output value of the pre-vortex pressure is used as a target pre-vortex pressure value for closed-loop control of the exhaust throttle valve 3, and the difference between the target pre-vortex pressure value and the actual pre-vortex pressure value is De. The third graph also comprises a third graph and a fourth graph, a Kp basic value, a Ki basic value and a Kd basic value can be obtained by searching on the third graph according to the rotating speed information and the oil quantity information, and a Kp correction factor, a Ki correction factor and a Kd correction factor can be obtained by searching on the fourth graph according to De. Namely, the third graph and the fourth graph are known relationship graphs, and the third graph and the fourth graph can be directly called according to corresponding rotating speed information, oil quantity information and a difference De between a target vortex front pressure value and an actual vortex front pressure value.
Preferably, the third graph is a two-dimensional map graph (the X axis is the rotating speed, the Y axis is the oil mass), the fourth graph is a one-dimensional correction factor graph (the X axis is De), the corresponding Kp basic value, Ki basic value and Kd basic value under the state can be obtained by respectively inquiring the two-dimensional map graph through inputting the rotating speed information and the oil mass information, the Kp correction factor, Ki correction factor and Kd correction factor can be obtained by respectively inquiring the one-dimensional correction factor graph through inputting the difference De between the target preswirl pressure value and the actual preswirl pressure value, the Kp basic value is multiplied by the Kp correction factor, the Ki basic value is multiplied by the Ki correction factor, and the Kd basic value is multiplied by the Kd correction factor to obtain Kp, Ki and Kd.
In step S25, the P control output value, the I control output value, and the D control output value satisfy the following relational expressions:
the P control output value is DexKp;
the I control output value is DexKi;
the D control output value ═ De (n) (De) (n-1) ] × Kp, n represents the number of cycles of differentiation.
In step S26, the feedback opening value of the exhaust throttle valve 3 is obtained by adding the P control output value, the I control output value, and the D control output value.
In the PID algorithm, a linear relationship is required for the control system, whereas the relationship between the opening degree of the exhaust throttle valve 3 and the actual preswirl pressure of the supercharger 2 is nonlinear (as shown in fig. 4), which affects the control effect. Therefore, in the present embodiment, the relationship between the opening degree of the exhaust throttle valve 3 and the actual preswirl pressure of the supercharger 2 is linearized, and an intermediate variable flow (x) is introduced to define the opening degree of the exhaust throttle valve 3 as ETVpos, the actual preswirl pressure of the supercharger 2 as P _ ETVpos, and flow (x) satisfies the following relational expression:
Flow(x)＝[P_(ETVpos_0)-P_(ETVpos_x)]/[P_(ETVpos_0)-P_(ETVpos_100)]×100。
where P _ (ETVpos _0) represents the actual pre-turbo pressure P _ ETVpos of the supercharger 2 when the opening ETVpos of the exhaust throttle valve 3 is 0. Similarly, P _ (ETVpos _100) represents the actual preswirl pressure P _ ETVpos of the supercharger 2 when the opening ETVpos of the exhaust throttle valve 3 is 100, and P _ (ETVpos _ x) represents the actual preswirl pressure P _ ETVpos of the supercharger 2 when the opening ETVpos of the exhaust throttle valve 3 is x.
As shown in fig. 5 and fig. 6, a process diagram of the linearization process is given, and the flow (x) after the linearization process and the actual pre-vortex pressure P _ ETVpos of the supercharger 2 satisfy a linear relationship.
In this embodiment, the relationship chart further includes a fourth chart, the operation information of the engine 1 includes rotation speed information and oil amount information, the maximum opening value and the minimum opening value of the exhaust throttle valve 3 are found and obtained on the fourth chart according to the rotation speed information and the oil amount information, and the target opening value of the exhaust throttle valve 3 is located between the maximum opening value and the minimum opening value. By limiting the target opening value of the exhaust throttle valve 3, the opening of the exhaust throttle valve 3 can be adjusted within a safe range. The maximum opening value and the minimum opening value both include a base value and a correction value, and the base value is respectively added and corrected by coolant temperature information, atmospheric pressure information, and atmospheric temperature information of the engine 1 in consideration of plateau, high temperature, and cold start conditions, so that the final maximum opening value and the final minimum opening value of the exhaust throttle valve 3 are obtained.
Further, the relation chart further comprises a fifth chart, the operation information of the engine 1 comprises rotation speed information and oil quantity information, a maximum change rate value and a minimum change rate value of the opening and closing of the exhaust throttle valve 3 are searched and obtained on the fifth chart according to the rotation speed information and the oil quantity information, and the opening and closing change rate of the exhaust throttle valve 3 is located between the maximum change rate value and the minimum change rate value. By limiting the change rate of the exhaust throttle valve 3 in the opening or closing process, the severe fluctuation of the preswirl pressure of the supercharger 2 of the engine 1 can be avoided, and the reliability of the supercharger assembly and the related sealing gasket is improved.
That is, the target opening value of the exhaust throttle valve 3 is an opening limited by the maximum opening value and the minimum opening value of the exhaust throttle valve 3 and by the opening/closing change rate of the exhaust throttle valve 3, and the target opening value is output to the actuator of the exhaust throttle valve 3 to keep the exhaust throttle valve 3 at an appropriate opening.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The control method of the engine control system is characterized in that the engine control system comprises an engine (1), a supercharger (2), an exhaust throttle valve (3), a first acquisition module (4), a second acquisition module and a relation chart, wherein the first acquisition module (4) is arranged on an exhaust pipe of the engine (1) and is positioned at an inlet end of the supercharger (2), the first acquisition module (4) is used for acquiring an actual pre-vortex pressure value of the supercharger (2), the exhaust throttle valve (3) is arranged on the exhaust pipe of the engine (1) and is positioned at an outlet end of the supercharger (2), and the second acquisition module is used for acquiring operation information of the engine (1);
the control method of the engine control system includes the steps of:
the operation information of the engine (1) is acquired through the second acquisition module, and the operation condition of the engine (1) is obtained;
and searching and obtaining corresponding control data information on the relation chart according to the operation information of the engine (1) and the operation working condition of the engine (1), and calculating and obtaining a target opening value of the exhaust throttle valve (3) according to the control data information and the actual pre-vortex pressure value.
2. The control method of an engine control system according to claim 1, characterized in that the control data information includes a feed-forward opening value of the exhaust throttle valve (3) and a feedback opening value of the exhaust throttle valve (3), and the target opening value is equal to a sum of the feed-forward opening value and the feedback opening value.
3. The control method of an engine control system according to claim 2, characterized in that the calculation method of the feed-forward opening value includes the steps of:
acquiring a basic opening value of the exhaust throttle valve (3), wherein the relation chart comprises a first chart, the operation information of the engine (1) comprises rotating speed information and oil quantity information, and the basic opening value is obtained by searching the first chart according to the rotating speed information and the oil quantity information;
acquiring a corrected opening value of the exhaust throttle valve (3), wherein the relation chart further comprises a second chart, the operation information of the engine (1) further comprises cooling liquid temperature information, atmospheric pressure information and atmospheric temperature information, and the corrected opening value is obtained by searching and calculating on the second chart according to the rotating speed information, the oil quantity information, the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information;
the feed-forward opening value is equal to a sum of the base opening value and the corrected opening value.
4. The control method of an engine control system according to claim 3, characterized in that the corrected opening value is equal to a product of a corrected base opening value of the exhaust throttle valve (3) and an opening correction factor of the exhaust throttle valve (3);
and the second graph comprises a first correction table and a second correction table, the correction basic opening degree value is obtained by searching the first correction table according to the rotating speed information and the oil quantity information, and the opening degree correction factor is obtained by searching the second correction table according to the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information.
5. The control method of an engine control system according to claim 2, characterized in that the feedback opening degree value is calculated by a PID algorithm, the calculation method including the steps of:
obtaining a P control parameter Kp, an I control parameter Ki and a D control parameter Kd of the PID algorithm according to the operation information of the engine (1) and the target output value of the preswirl pressure of the supercharger (2);
the relation graph further comprises a third graph, the operation information of the engine (1) comprises rotating speed information and oil quantity information, and Kp, Ki and Kd are obtained by searching and calculating on the third graph according to the rotating speed information, the oil quantity information and the pre-vortex pressure target output value;
obtaining a P control output value, an I control output value and a D control output value of the PID algorithm according to the pre-vortex pressure target output value, the actual pre-vortex pressure value, Kp, Ki and Kd;
the feedback opening value is equal to the sum of the P control output value, the I control output value and the D control output value.
6. The control method of the engine control system according to claim 5, characterized in that the target output value of the preswirl pressure of the supercharger (2) is equal to the sum of the basic target value of the preswirl pressure of the supercharger (2) and the preswirl pressure correction value of the supercharger (2);
the third graph comprises a first graph and a second graph, the basic target value of the pre-vortex pressure is obtained by searching the first graph according to the rotating speed information and the oil quantity information, the operation information of the engine (1) further comprises coolant temperature information, atmospheric pressure information and atmospheric temperature information, and the corrected value of the pre-vortex pressure is obtained by searching and calculating the second graph according to the rotating speed information, the oil quantity information, the coolant temperature information, the atmospheric pressure information and the atmospheric temperature information;
the preswirl pressure correction value is equal to the product of the preswirl pressure correction base value of the supercharger (2) and the preswirl pressure correction factor of the supercharger (2);
the second chart comprises a third correction table and a fourth correction table, the vortex front pressure correction base value is obtained by searching the third correction table according to the rotating speed information and the oil amount information, and the vortex front pressure correction factor is obtained by searching the fourth correction table according to the cooling liquid temperature information, the atmospheric pressure information and the atmospheric temperature information.
7. The control method of an engine control system according to claim 6, characterized in that Kp is equal to the product of Kp base value and Kp correction factor, Ki is equal to the product of Ki base value and Ki correction factor, and Kd is equal to the product of Kd base value and Kd correction factor;
taking the target output value of the preswirl pressure as a target preswirl pressure value of the exhaust throttle valve (3), and defining the difference value between the target preswirl pressure value and the actual preswirl pressure value as De;
the third graph further comprises a third graph and a fourth graph, the Kp basic value, the Ki basic value and the Kd basic value are obtained by searching on the third graph according to the rotating speed information and the oil quantity information, and the Kp correction factor, the Ki correction factor and the Kd correction factor are obtained by searching on the fourth graph according to De;
the P control output value, the I control output value and the D control output value satisfy the following relational expression:
the P control output value is DexKp;
the I control output value is DexKi;
d control output value ═ De (n) (De) (n-1) ] × Kp, n represents the number of cycles.
8. The control method of an engine control system according to claim 7, characterized in that a relationship between the opening degree of the exhaust throttle valve (3) and the actual preswirl pressure of the supercharger (2) is linearized, an intermediate variable flow (x) is introduced, the opening degree of the exhaust throttle valve (3) is defined as ETVpos, the actual preswirl pressure of the supercharger (2) is P _ ETVpos, and flow (x) satisfies the following relational expression:
Flow(x)＝[P_(ETVpos_0)-P_(ETVpos_x)]/[P_(ETVpos_0)-P_(ETVpos_100)]×100。
9. the control method of an engine control system according to any one of claims 1 to 8, characterized in that the relationship map further includes a map four, the engine (1) operation information includes rotation speed information and oil amount information, a maximum opening value and a minimum opening value of the exhaust throttle valve (3) are found on the map four based on the rotation speed information and the oil amount information, and the target opening value of the exhaust throttle valve (3) is located between the maximum opening value and the minimum opening value.
10. The control method of an engine control system according to any one of claims 1-8, characterized in that the relationship map further includes a map five, the engine (1) operation information includes rotation speed information and oil amount information, a maximum rate of change value and a minimum rate of change value of the opening and closing of the exhaust throttle valve (3) are found on the map five based on the rotation speed information and the oil amount information, and the opening and closing rate of change of the exhaust throttle valve (3) is located between the maximum rate of change value and the minimum rate of change value.
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