CN114135405A - Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine - Google Patents
Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine Download PDFInfo
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- CN114135405A CN114135405A CN202111375020.3A CN202111375020A CN114135405A CN 114135405 A CN114135405 A CN 114135405A CN 202111375020 A CN202111375020 A CN 202111375020A CN 114135405 A CN114135405 A CN 114135405A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 230000033228 biological regulation Effects 0.000 claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 4
- 230000004069 differentiation Effects 0.000 claims abstract description 4
- 230000010354 integration Effects 0.000 claims abstract description 4
- 238000011217 control strategy Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000004043 responsiveness Effects 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides an open-loop control method for a two-stage supercharging system of a gas circuit of a high-pressure common rail diesel engine, which comprises the following steps: when the control system detects that the rotating speed of the diesel engine is unchanged and the accelerator is unchanged, the control system judges the operating condition to be a steady-state operating condition, obtains a target boost pressure by inquiring a target boost pressure map, obtains a target position of the bypass valve by PID (proportion integration differentiation) closed-loop of the target boost pressure and the actual boost pressure, and adds a correction feedforward term obtained by inquiring a valve opening map to obtain a position of the bypass valve subjected to PID feedforward regulation; when the control system detects that the working condition of the diesel engine changes from a steady state to a dynamic state, the bypass valve is closed quickly, the opening alpha before the bypass valve is closed is recorded, then the bypass valve returns to the opening alpha again when the excess air coefficient starts to rise until the fuel injection quantity and the rotating speed are not changed, and then the table lookup is carried out to obtain the opening beta of the bypass valve at the moment. The open-loop control method for the two-stage supercharging system of the gas circuit of the high-pressure common rail diesel engine can effectively improve the combustion efficiency.
Description
Technical Field
The invention belongs to the field of diesel engine control, and particularly relates to an open-loop control method for a two-stage supercharging system of a gas circuit of a high-pressure common-rail diesel engine.
Background
In a high pressure common rail system, the in-cylinder ambient conditions and injection parameters at the closing time of the intake valve of the diesel engine cylinder are the key to determine the combustion mode of the diesel engine. Due to the influence of various factors such as air inlet conditions, total air inlet and outlet amount, residual exhaust gas state in a cylinder, engine operation conditions and the like, the control of the environmental conditions in the cylinder has certain difficulty.
Disclosure of Invention
In view of this, the present invention is directed to provide an open-loop control method for a two-stage supercharging system of a gas path of a high-pressure common-rail diesel engine, so as to establish a model of an air system and analyze characteristics of the air system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an open-loop control method for a two-stage supercharging system of a gas circuit of a high-pressure common rail diesel engine comprises the following steps: when the control system detects that the rotating speed of the diesel engine is unchanged and the accelerator is unchanged, the control system judges the operating condition to be a steady-state operating condition, obtains the target boost pressure by inquiring a target boost pressure map, obtains the target position of the bypass valve by PID (proportion integration differentiation) closed-loop of the target boost pressure and the actual boost pressure, and adds the target position and a correction feedforward term obtained by inquiring a valve opening map to obtain the position of the bypass valve subjected to PID feedforward regulation;
when the control system detects that the working condition of the diesel engine changes from a steady state to a dynamic state, the bypass valve is closed quickly, the opening alpha before the bypass valve is closed is recorded, then the bypass valve returns to the opening alpha again when the excess air coefficient starts to rise until the fuel injection quantity and the rotating speed are not changed, and then the table lookup is carried out to obtain the opening beta of the bypass valve at the moment.
Further, after the fuel injection quantity and the rotating speed are finally stable, the working condition of the diesel engine is judged to be recovered to the stable state, and therefore control strategy adjustment under a feed-forward PID control algorithm is carried out.
Compared with the prior art, the open-loop control method for the gas circuit two-stage supercharging system of the high-pressure common rail diesel engine has the following advantages:
(1) the open-loop control method for the two-stage supercharging system of the gas circuit of the high-pressure common rail diesel engine can effectively control various parameters of the gas circuit of the diesel engine, thereby improving the conditions in a cylinder, improving the combustion efficiency and reducing the emission of pollutants.
(2) The open-loop control method of the gas circuit two-stage supercharging system of the high-pressure common rail diesel engine establishes a model of an air system by constructing a quick realization and test environment of an air system control algorithm, forms a virtual test environment based on the model by adopting hardware-in-the-loop simulation, and analyzes the characteristics of the air system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural diagram of an open-loop control system of a two-stage supercharging system of a gas circuit of a high-pressure common rail diesel engine according to an embodiment of the present invention;
FIG. 2 is a graph illustrating a comparison of dynamic performance of different control strategies under 500Nm acceleration according to an embodiment of the present invention;
FIG. 3 is a comparison of dynamic performance of different control strategies when the speed regulation characteristic 800r/min is loaded according to an embodiment of the present invention;
FIG. 4 is a diagram of a gas path system of a diesel engine according to an embodiment of the present invention;
fig. 5 is a measurement and control block diagram of the adjustable two-stage supercharging system according to the embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
An open-loop control method for a two-stage supercharging system of a gas circuit of a high-pressure common rail diesel engine is shown in figure 1 and comprises the following steps: when the control system detects that the rotating speed of the diesel engine is unchanged and the accelerator is unchanged, the control system judges the operating condition to be a steady-state operating condition, obtains the target boost pressure by inquiring a target boost pressure map, obtains the target position of the bypass valve by PID (proportion integration differentiation) closed-loop of the target boost pressure and the actual boost pressure, and adds the target position and a correction feedforward term obtained by inquiring a valve opening map to obtain the position of the bypass valve subjected to PID feedforward regulation; when the control system detects that the working condition of the diesel engine changes from a steady state to a dynamic state, the bypass valve is closed quickly, the opening alpha before the bypass valve is closed is recorded, then the bypass valve returns to the opening alpha again when the excess air coefficient starts to rise until the fuel injection quantity and the rotating speed are not changed, and then the table lookup is carried out to obtain the opening beta of the bypass valve at the moment.
The invention relates to a method for open-loop control of a two-stage supercharging system of a gas circuit of a high-pressure common-rail diesel engine, which can effectively control various parameters of the gas circuit of the diesel engine, thereby improving the conditions in a cylinder, improving the combustion efficiency and reducing the emission of pollutants.
Preferably, considering that the bypass valve will cause the fluctuation of the intake pressure again from full close to a certain opening, the fuel injection quantity and the rotating speed are judged to be recovered to the steady state after being finally stabilized, so that the control strategy regulation under the feed-forward PID control algorithm is carried out.
As shown in fig. 3, in the speed regulation characteristic test, the engine of the diesel engine suddenly encounters an external load, the rotation speed rapidly decreases, and then gradually recovers. The bypass valve is closed in the whole process until the final working condition is stable, the intake pressure is obviously improved in the process, although the total response effect of the rotating speed is not changed greatly, the adjusting time is still shortened by about 3s, and a certain lifting effect still appears in the interval from 11s to 16 s.
In one embodiment, as shown in FIG. 2, at a constant torque of 500Nm, the speed of the diesel engine is accelerated from 800r/min to 1200r/min, keeping the bypass valve opening at 10 ° under the economy strategy. The intake pressure and the excess air ratio are improved from the 4 th s to the 10 th s, particularly the lowest value of the excess air ratio is improved by 10.5%, at the moment, the responsiveness of the change of the engine speed is improved compared with the condition that a bypass valve is not adjusted, the overshoot is reduced, the adjusting time is shortened by 14.6%, and the dynamic performance of a supercharging system is also improved. As shown in FIG. 3, the throttle opening is set to 80%, and the diesel engine speed is stabilized at 4700 r/min. And when the time reaches 5s, the rotating speed of the engine is gradually reduced, and the fuel injection quantity is gradually increased so as to improve the rotating speed of the engine.
As shown in fig. 4, a complex intake system model of a supercharger combination of a diesel engine is established. Because the diesel engine is over-oxygen combustion, the throttle valve control mainly has the functions of matching with the EGR valve to control the mixed air inflow so as to improve the combustion efficiency and reduce the emission pollutants. For high power special engines that do not require emissions requirements, supercharger control is a key factor in boosting engine power.
As shown in FIG. 5, a test block diagram of the adjustable two-stage supercharging system is established. The core of the control of the whole gas circuit is the control of the supercharger, the dynamic response of the supercharger determines the dynamic response of the whole gas circuit, in the series connection supercharging system, according to the characteristics of the double-supercharging system, the dynamic and steady-state control of the two-stage adjustable supercharging system needs to be analyzed in a distinguishing way, the matching performance with an engine is improved to the greatest extent, on the basis of analyzing the generation reasons of the oil consumption rate, the air intake lag and the like, the control rule of the two-stage adjustable supercharging system is researched, and the oil consumption rate and the supercharging pressure can be reduced. According to the scheme, the model of the air system is established by constructing the quick realization and test environment of the control algorithm of the air system, the virtual test environment based on the model is formed by hardware-in-loop simulation, and the characteristics of the air system are analyzed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. An open-loop control method for a two-stage supercharging system of a gas circuit of a high-pressure common rail diesel engine is characterized by comprising the following steps of: the method comprises the following steps: when the control system detects that the rotating speed of the diesel engine is unchanged and the accelerator is unchanged, the control system judges the operating condition to be a steady-state operating condition, obtains the target boost pressure by inquiring a target boost pressure map, obtains the target position of the bypass valve by PID (proportion integration differentiation) closed-loop of the target boost pressure and the actual boost pressure, and adds the target position and a correction feedforward term obtained by inquiring a valve opening map to obtain the position of the bypass valve subjected to PID feedforward regulation;
when the control system detects that the working condition of the diesel engine changes from a steady state to a dynamic state, the bypass valve is closed quickly, the opening alpha before the bypass valve is closed is recorded, then the bypass valve returns to the opening alpha again when the excess air coefficient starts to rise until the fuel injection quantity and the rotating speed are not changed, and then the table lookup is carried out to obtain the opening beta of the bypass valve at the moment.
2. The open-loop control method for the gas circuit two-stage supercharging system of the high-pressure common rail diesel engine according to claim 1, characterized in that: and after the fuel injection quantity and the rotating speed are finally stable, judging that the working condition of the diesel engine is recovered to the stable state, and adjusting the control strategy under the feedforward PID control algorithm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375020.3A CN114135405A (en) | 2021-11-19 | 2021-11-19 | Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111375020.3A CN114135405A (en) | 2021-11-19 | 2021-11-19 | Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine |
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| CN114135405A true CN114135405A (en) | 2022-03-04 |
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| CN202111375020.3A Pending CN114135405A (en) | 2021-11-19 | 2021-11-19 | Open-loop control method for gas circuit two-stage supercharging system of high-pressure common-rail diesel engine |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018119473A (en) * | 2017-01-25 | 2018-08-02 | いすゞ自動車株式会社 | Engine and control method thereof |
| CN109854394A (en) * | 2017-11-30 | 2019-06-07 | 中国人民解放军陆军军事交通学院 | Become the double VGT second level adjustable supercharging control methods of height above sea level |
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2021
- 2021-11-19 CN CN202111375020.3A patent/CN114135405A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018119473A (en) * | 2017-01-25 | 2018-08-02 | いすゞ自動車株式会社 | Engine and control method thereof |
| CN109854394A (en) * | 2017-11-30 | 2019-06-07 | 中国人民解放军陆军军事交通学院 | Become the double VGT second level adjustable supercharging control methods of height above sea level |
Non-Patent Citations (1)
| Title |
|---|
| 沈笠;崔毅;邓康耀;张宝川;李先南;王新权;: "基于空燃比控制的可调两级增压动态性能研究", 柴油机 * |
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