CN112228234A - Transient fuel control method and system of gas engine for power generation - Google Patents
Transient fuel control method and system of gas engine for power generation Download PDFInfo
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- CN112228234A CN112228234A CN202011048179.XA CN202011048179A CN112228234A CN 112228234 A CN112228234 A CN 112228234A CN 202011048179 A CN202011048179 A CN 202011048179A CN 112228234 A CN112228234 A CN 112228234A
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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
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- F02D41/30—Controlling fuel injection
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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
Abstract
The embodiment of the application discloses a transient fuel control method and a transient fuel control system of a gas engine for power generation, which are used for optimizing fuel supply of the engine under transient working conditions and improving the stability of the engine under different working conditions. The method in the embodiment of the application comprises the following steps: judging whether the engine runs under a steady-state working condition or not; if so, calculating the air flow by adopting an air flow model of an air inlet main pipe; if not, calculating the air flow by adopting a throttle air flow model, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air inlet main pipe gas pressure parameter; and calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
Description
Technical Field
The embodiment of the application relates to the field of gas engines, in particular to a transient fuel control method and a transient fuel control system of a gas engine for power generation.
Background
In the prior art, the control of engine fuel by a medium-Pressure gas engine for power generation at present adopts an intake Manifold air flow model, namely, the engine air flow is calculated according to the Absolute intake Pressure (MAP) of an intake Manifold of the engine, the intake Manifold Temperature (MAT), the engine displacement and the inflation coefficient, and the fuel injection quantity required by the operation of the engine is calculated according to the air flow and a preset air-fuel ratio, so that the calculation precision of the air flow directly influences the control precision of the air-fuel ratio, the combustion in a cylinder is influenced, and the response performance of the engine is influenced finally.
However, when the engine load is transient, the throttle valve of the engine is suddenly opened up or down to control the air intake amount, at this time, the air intake amount is suddenly increased or decreased, so that the actual air flow of the engine is suddenly changed, the actual data of the MAP is also suddenly changed, but the signal collected by the intake manifold pressure MAP sensor is delayed, so that the MAP data in the intake manifold air flow model is inaccurate, therefore, the fuel injection quantity data calculated by using the model is also subjected to error, and finally, the combustible mixture of the engine is over-rich or over-lean, so that the normal operation of the engine is affected, and the operation fluctuation of the engine is caused.
Disclosure of Invention
The embodiment of the application provides a transient fuel control method and a transient fuel control system of a gas engine for power generation, which are used for optimizing fuel supply of the engine under transient working conditions and improving the stability of the engine under different working conditions.
In a first aspect, an embodiment of the present application provides a transient fuel control method for a gas engine for power generation, including:
judging whether the engine runs under a steady-state working condition or not;
if so, calculating the air flow by adopting an air flow model of an air inlet main pipe;
if not, calculating the air flow by adopting a throttle air flow model, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air inlet main pipe gas pressure parameter;
and calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
Optionally, the method further includes:
acquiring an effective flow area parameter of a throttle valve, a gas pressure parameter before the throttle valve, a gas pressure parameter of an air inlet main pipe and a correction coefficient parameter, wherein the correction coefficient parameter is calibrated according to an engine rack, and the correction coefficient parameter is used for compensating and correcting the air flow under the transient working condition;
and establishing a throttle air flow model according to the acquired throttle effective flow area parameter, the throttle front gas pressure parameter, the intake manifold gas pressure parameter and the correction coefficient parameter, wherein the throttle air flow model is used for calculating the air flow under the transient working condition of the engine.
Optionally, the determining whether the engine is operating under the steady-state operating condition includes:
acquiring an absolute value of a throttle opening change rate;
judging whether the absolute value is smaller than a preset value;
if so, determining that the engine operates under a steady-state working condition;
and if not, determining that the engine runs under the transient working condition.
Optionally, the preset value is calibrated according to actual operating parameters of the engine.
Optionally, the method further includes:
an air-fuel ratio of the engine is controlled according to the fuel injection amount.
A second aspect of an embodiment of the present application provides a transient fuel control system of a gas engine for power generation, including:
the judging unit is used for judging whether the engine runs under a steady-state working condition or not;
the first calculating unit is used for calculating the air flow by adopting an air flow model of an air inlet main pipe when the judging unit judges that the engine runs under the steady-state working condition;
the second calculation unit is used for calculating the air flow by adopting a throttle air flow model when the judgment unit judges that the engine runs under the transient working condition, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air inlet main pipe gas pressure parameter;
and the third calculating unit is used for calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
Optionally, the system further includes:
the system comprises an acquisition unit, a correction unit and a control unit, wherein the acquisition unit is used for acquiring an effective flow area parameter of a throttle valve, a gas pressure parameter before the throttle valve, a gas pressure parameter of an air inlet main pipe and a correction coefficient parameter, the correction coefficient parameter is calibrated according to an engine rack, and the correction coefficient parameter is used for compensating and correcting the air flow under a transient working condition;
and the establishing unit is used for establishing a throttle air flow model according to the acquired throttle effective flow area parameter, the throttle front gas pressure parameter, the intake manifold gas pressure parameter and the correction coefficient parameter, and the throttle air flow model is used for calculating the air flow under the transient working condition of the engine.
Optionally, the determining unit includes:
the acquiring module is used for acquiring an absolute value of the throttle opening change rate;
the judging module is used for judging whether the absolute value is smaller than a preset value;
the first determining module is used for determining that the engine runs under a steady-state working condition when the judging module judges that the absolute value is smaller than a preset value;
and the second determination module is used for determining that the engine runs under the transient working condition when the judgment module judges that the absolute value is larger than the preset value.
Optionally, the preset value is calibrated according to actual operating parameters of the engine.
Optionally, the system further includes:
a control unit for controlling an air-fuel ratio of the engine according to the fuel injection amount.
According to the technical scheme, the embodiment of the application has the following advantages:
in order to solve the problem that the change of the air inlet main pipe pressure MAP data is delayed under the transient working condition, if an air inlet main pipe air flow model is adopted, the calculated air flow data has a large error, and the air flow under the transient working condition is calculated more accurately by adopting a throttle air flow model. In the throttle air flow model, the MAP data is required to be referred, and the effective flow area of the throttle valve and the gas pressure in front of the throttle valve are combined for calculation, so that the air flow calculated by using the model is closer to the actual air quantity which is actually introduced into a cylinder in the transient working condition, and the calculated fuel injection quantity is more suitable.
The air flow is calculated by adopting the air inlet main pipe air flow model under the steady-state working condition and adopting the air throttle air flow model under the transient working condition, so that the problem of larger fuel injection quantity data deviation obtained by calculating by using the air inlet main pipe model under the transient working condition is solved, and the fuel supply of the engine under the transient working condition is optimized, thereby improving the stability of the engine under different working conditions and optimizing the response performance of the engine.
Drawings
FIG. 1 is a schematic flow chart illustrating an embodiment of a transient fuel control method for a gas engine for power generation according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating a method for transient fuel control of a gas engine for power generation according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of an embodiment of a transient fuel control system of a gas engine for power generation according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another embodiment of a transient fuel control system of a gas engine for power generation according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a transient fuel control method and a transient fuel control system of a gas engine for power generation, which are used for optimizing fuel supply of the engine under transient working conditions and improving the stability of the engine under different working conditions.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, 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 application.
The method of the present application is applied to an electronic control unit of an engine or other devices having logic processing capability, and the present application is not limited thereto.
Referring to fig. 1, an embodiment of a transient fuel control method for a gas engine for power generation according to the embodiment of the present application includes:
101. judging whether the engine runs under a steady-state working condition, if so, executing step 102, and if not, executing step 103;
the fuel injection amount of a gas engine is calculated according to a target air-fuel ratio based on the air flow rate entering the engine cylinder, so that the calculation of the air flow rate directly affects the control accuracy of the air-fuel ratio, and thus affects the performance of the engine. Unlike the steady state operating conditions, when the engine is operated under transient operating conditions, the air flow also changes suddenly due to the sudden opening or closing of the throttle, and the engine performance is affected by using the same model calculation, for example: when the throttle valve is opened, the amount of air actually entering the cylinder is larger than the calculated amount of air, and the calculated fuel injection amount is not changed, so that the air-fuel ratio in the cylinder is too large, and the engine may be misfired; when the throttle valve is closed suddenly, the amount of air actually taken into the cylinder is smaller than the calculated amount of air, and the air-fuel ratio in the cylinder is too small, which may cause a failure such as engine knocking.
Therefore, before calculating the fuel injection quantity of the engine, whether the engine is currently operated under a steady-state working condition or a transient working condition needs to be judged, so that the air flow which is more in line with the actual condition is obtained to achieve accurate control of the fuel. It should be noted that the steady-state operating condition refers to that the engine operates in a state where the load is not changed or the change is small; transient operating conditions refer to operating conditions when engine load changes suddenly.
102. Calculating the air flow by adopting an air flow model of an air inlet main pipe;
when the engine is operating in a steady state condition, an intake manifold air flow model is used to calculate the air flow. The intake manifold air flow rate model is a model for calculating the air flow rate from the intake absolute pressure map (kpa) of the intake manifold of the engine, the intake manifold temperature mat (K), the engine displacement (K), and the charge coefficient. The inflation coefficient is a function of the engine speed and the gas pressure in the air inlet main pipe, and under the normal use of the engine, factors actually influencing the inflation coefficient mainly comprise the engine speed and the load.
It should be noted that step 104 is executed directly after step 102 is executed to calculate the fuel injection amount.
103. Calculating air flow by adopting a throttle air flow model, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air pressure parameter of an air inlet main pipe;
when the engine is operating in a transient condition, a throttle airflow model is used to calculate airflow. The throttle valve mainly comprises a throttle valve body, a throttle valve plate, a throttle position sensor and the like, wherein the throttle valve plate is used for controlling the air flow passing through the throttle valve, and the throttle position sensor is used for feeding back the opening angle of the throttle valve.
The throttle air flow model comprises a throttle effective flow area (A) and a throttle front air pressure (kPA), wherein the throttle effective flow area refers to a section effective area for air to flow when a throttle valve plate is partially opened, the section effective area continuously changes along with the opening angle of the throttle, and the flow area increases along with the increase of the opening degree within a certain range. The air pressure in front of the throttle valve can be measured by a pressure sensor, the effective flow area of the throttle valve can be combined with the air pressure in front of the throttle valve to estimate the current air flow of the throttle valve, and the air flow calculated by the model is close to the actual air flow under the transient working condition.
104. And calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
Note that in this step, the airflow is calculated for the intake manifold airflow model during steady state conditions and for the throttle airflow model during transient conditions.
In the embodiment, in order to solve the problem that the calculated air flow data has a large error due to inaccurate MAP data under the transient operating condition, the air flow under the transient operating condition is calculated by adopting a throttle air flow model. In the throttle air flow rate model, not only MAP data is referred to, but also the throttle effective flow area and the pre-throttle gas pressure are combined for calculation, so that the air flow rate calculated by using the model is close to the air amount actually entering the cylinder, and the calculated fuel injection amount is more appropriate.
In the embodiment, the air flow is calculated by adopting the air inlet main pipe air flow model under the steady-state working condition and adopting the air throttle air flow model under the transient working condition, so that the problem of larger fuel injection quantity data deviation obtained by calculating by using the air inlet main pipe model under the transient working condition is solved, and the fuel supply of the engine under the transient working condition is optimized, thereby improving the stability of the engine under different working conditions and optimizing the response performance of the engine.
Referring to fig. 2, another embodiment of the transient fuel control method for a gas engine for power generation according to the embodiment of the present application includes:
201. acquiring an effective flow area parameter of a throttle valve, a gas pressure parameter before the throttle valve, a gas pressure parameter of an air inlet main pipe and a correction coefficient parameter, wherein the correction coefficient parameter is calibrated according to an engine rack, and the correction coefficient parameter is used for compensating and correcting the air flow under the transient working condition;
the throttle valve is used for controlling the air intake flow of the engine and determining the operation condition of the engine, and it should be noted that the effective flow area parameter of the throttle valve is the effective area of the section for air circulation, the gas pressure parameter in front of the throttle valve is the gas pressure value in front of the throttle valve, and the gas pressure parameter of the air intake main pipe is the pressure value in the rear of the throttle valve in the air intake main pipe, the value of the effective flow area parameter can indirectly reflect the air intake amount of the engine, the correction coefficient parameter is used for carrying out transient compensation on the air flow, the value of the correction coefficient parameter is calibrated according to the actual operation of the engine stand, and.
202. Establishing a throttle air flow model according to the acquired throttle effective flow area parameter, the throttle front gas pressure parameter, the intake manifold gas pressure parameter and the correction coefficient parameter, wherein the throttle air flow model is used for calculating the air flow under the transient working condition of the engine;
the air flow model of the throttle valve established according to the parameters needs to refer to MAP data, is calculated by combining the effective flow area of the throttle valve and the gas pressure in front of the throttle valve, and compensates the air flow entering the cylinder under the transient working condition according to the correction coefficient, so that the air flow calculated by using the model is similar to the air flow actually entering the cylinder under the transient working condition, and the calculated fuel injection quantity is more suitable.
203. Acquiring an absolute value of a throttle opening change rate;
the throttle opening (%) is the opening angle of the throttle, and the air intake amount of the engine is changed when the throttle opening is changed, and different throttle openings mark different operating conditions of the engine. The throttle opening degree can be measured by a throttle position sensor, and when the throttle opening degree changes, the throttle position sensor generates a corresponding voltage signal which can reflect the size and the change rate of the throttle opening degree.
The throttle opening change rate is a change value of the throttle opening per second, and has a unit of%/s. When the engine enters the transient working condition, the throttle valve is suddenly opened to be larger or smaller, and the value of the throttle opening is increased or reduced at the moment, so that whether the engine enters the transient working condition or not can be reflected by judging the absolute value of the change rate of the throttle opening in a short time.
204. Judging whether the absolute value is smaller than a preset value, if so, executing step 205, otherwise, executing step 207;
it should be noted that the preset value is calibrated in bench tests according to the actual performance of the engine, and when the current throttle opening change rate is smaller than the preset value, it can be determined that the engine is operated in a steady state, and then step 205 and step 206 are executed to calculate the air flow according to the air flow model of the intake manifold. When the throttle opening change rate is greater than this value, it can be determined that the engine is operating in a transient condition, where steps 207 and 208 are performed to calculate the air flow rate based on the throttle air flow rate model.
Optionally, the preset value is calibrated according to the actual operating parameters of the engine, for example, the preset value may be 200%/s. That is, when the absolute value of the rate of change of the throttle opening of the engine is less than 200%/s, it is determined that the engine is operating in the steady state condition.
205. Determining that the engine is operating in a steady state condition;
206. calculating the air flow by adopting an air flow model of an air inlet main pipe;
step 206 is similar to step 102, and will not be described herein.
207. Determining that the engine is operating in a transient operating condition;
and when the throttle opening change rate of the engine is greater than a preset value, judging that the engine runs under the transient working condition.
Optionally, the preset value is calibrated according to the actual operating parameters of the engine, for example, the preset value may be 200%/s. That is, when the absolute value of the rate of change of the throttle opening of the engine is greater than 200%/s, it is determined that the engine is operating in the transient operating condition.
208. Calculating air flow by adopting a throttle air flow model, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air pressure parameter of an air inlet main pipe;
209. calculating fuel injection quantity according to the air flow and a preset air-fuel ratio;
210. An air-fuel ratio of the engine is controlled according to the fuel injection amount.
In the embodiment, whether the engine enters the transient operating condition or not is judged through the opening change rate of the throttle valve of the engine, the parameter can reflect whether the throttle valve is suddenly opened or closed or not, and the operating condition of the engine can be accurately judged through the parameter. When the engine is judged to be in the transient working condition, the throttle flow model is adopted for calculation, after the throttle is opened or closed suddenly, the calculated air quantity is close to the air quantity actually entering the cylinder, and the calculated gas injection quantity is more appropriate, so that the air-fuel ratio control is accurate, the engine can obtain rapid power improvement, and the response speed of the engine entering the transient working condition is improved.
The transient fuel control method of the gas engine for power generation in the embodiment of the present application is described above, and the transient fuel control system of the gas engine for power generation in the embodiment of the present application is described below:
referring to fig. 3, an embodiment of a transient fuel control system of a gas engine for power generation in an embodiment of the present application includes:
the judging unit 301 is used for judging whether the engine runs under a steady-state working condition;
a first calculating unit 302, configured to calculate an air flow by using an air intake manifold air flow model when the determining unit determines that the engine is operating under a steady-state operating condition;
a second calculating unit 303, configured to calculate an air flow by using a throttle air flow model when the determining unit determines that the engine is operating under the transient operating condition, where the throttle air flow model includes a throttle effective flow area parameter, a throttle front gas pressure parameter, and an intake manifold gas pressure parameter;
and a third calculating unit 304 for calculating a fuel injection amount according to the air flow and a preset air-fuel ratio.
In this embodiment, whether the engine operates under a steady-state condition is determined by the determining unit 301, and when the engine operates under the steady-state condition, the first calculating unit 302 adopts an intake manifold air flow rate model, and when the engine operates under a transient condition, the second calculating unit 303 calculates the air flow rate by adopting a throttle air flow rate model, so that the problem that the deviation of fuel injection quantity data calculated by using the intake manifold model under the transient condition is large is solved, the fuel supply of the engine under the transient condition is optimized, the stability of the engine under different conditions is improved, and the response performance of the engine is optimized.
Referring to fig. 4, the transient fuel control system of the gas engine for power generation in the embodiment of the present application is described in detail below, and another embodiment of the transient fuel control system of the gas engine for power generation in the embodiment of the present application includes:
the judging unit 401 is configured to judge whether the engine operates under a steady-state working condition;
a first calculating unit 402, configured to calculate an air flow by using an air intake manifold air flow model when the determining unit determines that the engine is operating under a steady-state operating condition;
a second calculating unit 403, configured to calculate an air flow by using a throttle air flow model when the determining unit determines that the engine is operating under the transient operating condition, where the throttle air flow model includes a throttle effective flow area parameter, a throttle front gas pressure parameter, and an intake manifold gas pressure parameter;
and a third calculating unit 404 for calculating a fuel injection amount according to the air flow and a preset air-fuel ratio.
In this embodiment, the transient fuel control system of the gas engine for power generation further includes:
an obtaining unit 405, configured to obtain an effective flow area parameter of a throttle, a gas pressure parameter before the throttle, a gas pressure parameter of an intake manifold, and a correction coefficient parameter, where the correction coefficient parameter is calibrated according to an engine bench, and the correction coefficient parameter is used to compensate and correct an air flow rate under a transient operating condition;
and the establishing unit 406 is configured to establish a throttle air flow model according to the acquired throttle effective flow area parameter, the pre-throttle gas pressure parameter, the intake manifold gas pressure parameter, and the correction coefficient parameter, where the throttle air flow model is used to calculate the air flow under the transient operating condition of the engine.
In this embodiment, the determining unit 401 includes:
the acquiring module 4011 is configured to acquire an absolute value of a throttle opening change rate;
the judging module 4012 is configured to judge whether the absolute value is smaller than a preset value;
the first determining module 4013 is configured to determine that the engine operates under a steady-state operating condition when the determining module determines that the absolute value is smaller than the preset value;
and the second determining module 4014 is configured to determine that the engine operates under the transient operating condition when the determining module determines that the absolute value is greater than the preset value.
In this embodiment, the transient fuel control system of the gas engine for power generation further includes:
a control unit 407 for controlling the air-fuel ratio of the engine according to the fuel injection amount.
In this embodiment, the functions of each unit and each module correspond to the steps in the embodiment shown in fig. 2, and are not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (10)
1. A transient fuel control method for a gas engine for power generation, comprising:
judging whether the engine runs under a steady-state working condition or not;
if so, calculating the air flow by adopting an air flow model of an air inlet main pipe;
if not, calculating the air flow by adopting a throttle air flow model, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air inlet main pipe gas pressure parameter;
and calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
2. The method of claim 1, wherein prior to said determining whether the engine is operating in a steady state operating condition, the method further comprises:
acquiring an effective flow area parameter of a throttle valve, a gas pressure parameter before the throttle valve, a gas pressure parameter of an air inlet main pipe and a correction coefficient parameter, wherein the correction coefficient parameter is calibrated according to an engine rack, and the correction coefficient parameter is used for compensating and correcting the air flow under the transient working condition;
and establishing a throttle air flow model according to the acquired throttle effective flow area parameter, the throttle front gas pressure parameter, the intake manifold gas pressure parameter and the correction coefficient parameter, wherein the throttle air flow model is used for calculating the air flow under the transient working condition of the engine.
3. The method of claim 1, wherein determining whether the engine is operating in a steady state condition comprises:
acquiring an absolute value of a throttle opening change rate;
judging whether the absolute value is smaller than a preset value;
if so, determining that the engine operates under a steady-state working condition;
and if not, determining that the engine runs under the transient working condition.
4. A method according to claim 3, characterized in that said preset value is calibrated according to actual engine operating parameters.
5. The method according to any one of claims 1 to 4, further comprising:
an air-fuel ratio of the engine is controlled according to the fuel injection amount.
6. A transient fuel control system for a gas engine for power generation, comprising:
the judging unit is used for judging whether the engine runs under a steady-state working condition or not;
the first calculating unit is used for calculating the air flow by adopting an air flow model of an air inlet main pipe when the judging unit judges that the engine runs under the steady-state working condition;
the second calculation unit is used for calculating the air flow by adopting a throttle air flow model when the judgment unit judges that the engine runs under the transient working condition, wherein the throttle air flow model comprises a throttle effective flow area parameter, a throttle front gas pressure parameter and an air inlet main pipe gas pressure parameter;
and the third calculating unit is used for calculating the fuel injection quantity according to the air flow and a preset air-fuel ratio.
7. The system of claim 6, further comprising:
the system comprises an acquisition unit, a correction unit and a control unit, wherein the acquisition unit is used for acquiring an effective flow area parameter of a throttle valve, a gas pressure parameter before the throttle valve, a gas pressure parameter of an air inlet main pipe and a correction coefficient parameter, the correction coefficient parameter is calibrated according to an engine rack, and the correction coefficient parameter is used for compensating and correcting the air flow under a transient working condition;
and the establishing unit is used for establishing a throttle air flow model according to the acquired throttle effective flow area parameter, the throttle front gas pressure parameter, the intake manifold gas pressure parameter and the correction coefficient parameter, and the throttle air flow model is used for calculating the air flow under the transient working condition of the engine.
8. The system according to claim 6, wherein the judging unit includes:
the acquiring module is used for acquiring an absolute value of the throttle opening change rate;
the judging module is used for judging whether the absolute value is smaller than a preset value;
the first determining module is used for determining that the engine runs under a steady-state working condition when the judging module judges that the absolute value is smaller than a preset value;
and the second determination module is used for determining that the engine runs under the transient working condition when the judgment module judges that the absolute value is larger than the preset value.
9. The system of claim 8, wherein the predetermined value is calibrated based on actual engine operating parameters.
10. The system of any one of claims 6 to 9, further comprising:
a control unit for controlling an air-fuel ratio of the engine according to the fuel injection amount.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113191071A (en) * | 2021-03-29 | 2021-07-30 | 广西玉柴机器股份有限公司 | Method for virtually calibrating engine model and related device thereof |
| CN113343597A (en) * | 2021-06-01 | 2021-09-03 | 潍柴动力股份有限公司 | Method and device for calculating virtual pressure behind throttle valve |
| CN114738135A (en) * | 2022-03-24 | 2022-07-12 | 东风汽车集团股份有限公司 | Gas flow reaction time calculation method, device, equipment and readable storage medium |
| CN114810405A (en) * | 2022-05-19 | 2022-07-29 | 潍柴动力股份有限公司 | Control method and device |
| CN117871771A (en) * | 2024-03-13 | 2024-04-12 | 山东国研自动化有限公司 | Big data-based gas energy monitoring method |
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| CN111075584A (en) * | 2019-12-31 | 2020-04-28 | 潍柴动力股份有限公司 | Method and device for determining air inflow of engine, storage medium and electronic equipment |
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| CN111075584A (en) * | 2019-12-31 | 2020-04-28 | 潍柴动力股份有限公司 | Method and device for determining air inflow of engine, storage medium and electronic equipment |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113191071A (en) * | 2021-03-29 | 2021-07-30 | 广西玉柴机器股份有限公司 | Method for virtually calibrating engine model and related device thereof |
| CN113191071B (en) * | 2021-03-29 | 2023-06-02 | 广西玉柴机器股份有限公司 | Method for virtually calibrating engine model and related device thereof |
| CN113343597A (en) * | 2021-06-01 | 2021-09-03 | 潍柴动力股份有限公司 | Method and device for calculating virtual pressure behind throttle valve |
| CN113343597B (en) * | 2021-06-01 | 2023-04-18 | 潍柴动力股份有限公司 | Method and device for calculating virtual pressure behind throttle valve |
| CN114738135A (en) * | 2022-03-24 | 2022-07-12 | 东风汽车集团股份有限公司 | Gas flow reaction time calculation method, device, equipment and readable storage medium |
| CN114810405A (en) * | 2022-05-19 | 2022-07-29 | 潍柴动力股份有限公司 | Control method and device |
| CN117871771A (en) * | 2024-03-13 | 2024-04-12 | 山东国研自动化有限公司 | Big data-based gas energy monitoring method |
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