CN113202652B - Gas engine gas injection correction method and gas engine - Google Patents
Gas engine gas injection correction method and gas engine Download PDFInfo
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- CN113202652B CN113202652B CN202110679060.0A CN202110679060A CN113202652B CN 113202652 B CN113202652 B CN 113202652B CN 202110679060 A CN202110679060 A CN 202110679060A CN 113202652 B CN113202652 B CN 113202652B
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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
- F02D41/0025—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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of gas engines, in particular to a gas engine gas injection correction method and a gas engine. The gas engine gas injection correction method comprises the steps of firstly calculating the volume flow of the mixed gas entering a cylinder, simultaneously obtaining the actual air-fuel ratio of the mixed gas, and calculating the density of the mixed gas entering the cylinder according to the actual air-fuel ratio of the mixed gas; then multiplying the volume flow of the mixed gas by the density of the mixed gas to obtain the mass flow of the mixed gas; then calculating the mass flow of the fuel gas according to the mass flow of the mixed gas, and correcting the obtained mass flow of the fuel gas; the corrected mass flow of fuel gas is then sent to the fuel gas injection device. According to the gas engine gas injection correction method provided by the invention, the density of the mixed gas is calculated, and the obtained mass flow of the mixed gas is more accurate, so that the required gas injection quantity can be calculated and controlled more accurately, and further the performance of the engine is improved.
Description
Technical Field
The invention relates to the technical field of gas engines, in particular to a gas engine gas injection correction method and a gas engine.
Background
The steady state engine operation is typically calculated using a Speed-Density Method (Speed-Density Method) for the volumetric flow of gas into the cylinder. For a fuel engine, the fuel cylinder is directly injected, and gaseous matters entering the cylinder are pure air, so that the mass flow of the air entering the cylinder can be obtained by multiplying the volume flow calculated according to a speed density method by the density of the air.
However, in the case of a gas engine, the mixing of the gas and air is upstream of the booster compressor or downstream of the booster compressor, and the gaseous substance entering the cylinder is a mixture of air and gas, so that the volumetric flow rate of the gaseous substance calculated by the velocity density method is the volumetric flow rate of the mixture containing gas and air. Therefore, if the volume flow of the mixture is multiplied by the air density, errors of the calculated mass flow of the mixture tend to be caused, which is disadvantageous for accurate control of the injection quantity of the fuel gas and further disadvantageous for improving the performance of the engine.
Disclosure of Invention
The invention aims to provide a gas engine gas injection correction method and a gas engine, the calculated mass flow accuracy of the mixed gas is higher, the required gas injection quantity can be calculated and controlled more accurately, and the performance of the engine is improved.
To achieve the purpose, the invention adopts the following technical scheme:
a gas engine fuel injection correction method comprises the steps of firstly calculating the volume flow of the mixture entering a cylinder, simultaneously obtaining the actual air-fuel ratio of the mixture, and calculating the density of the mixture entering the cylinder according to the actual air-fuel ratio of the mixture; then multiplying the volume flow of the mixed gas by the density of the mixed gas to obtain the mass flow of the mixed gas; then calculating the mass flow of the fuel gas according to the mass flow of the mixed gas, and correcting the obtained mass flow of the fuel gas; the corrected mass flow of fuel gas is then sent to the fuel gas injection device.
As a preferable technical scheme of the gas engine gas injection correction method, the method for acquiring the actual air-fuel ratio of the mixture gas is as follows: the concentration of oxygen in the exhaust gas is obtained, and the excess air ratio is obtained from the concentration of oxygen in the exhaust gas, and then the excess air ratio is multiplied by the stoichiometric air-fuel ratio of the mixture.
As a preferable technical scheme of the gas engine gas injection correction method, an oxygen sensor is used to obtain the concentration of oxygen in the exhaust gas.
As a preferable technical scheme of the gas injection correction method of the gas engine, the method for calculating the density of the mixture entering the cylinder according to the actual air-fuel ratio of the mixture is as follows: the ratio of the air mass to the total mass of the mixture is multiplied by the density of the air, and the ratio of the gas mass to the total mass of the mixture is multiplied by the density of the gas.
As a preferable technical scheme of the gas injection correction method of the gas engine, the method for calculating the volume flow of the mixed gas entering the cylinder is calculated by a speed density method.
As a preferable technical scheme of the gas injection correction method of the gas engine, a formula for calculating the volume flow of the mixed gas entering the cylinder by a speed density method is as follows:
wherein: q (Q) mix The volume flow (L/s) of the mixed gas, n is the engine speed (r/min), eta vol For the charging efficiency, V is the engine displacement (L), MAP is the pressure in the intake pipe (kPA), and MAT is the temperature of the gaseous matter in the intake pipe (K).
As a preferred technical scheme of the gas injection correction method of the gas engine, a formula for calculating the mass flow of the required gas according to the mass flow of the mixed gas is as follows:
the required mass flow rate of fuel gas=the mass flow rate of the mixture ++1 (stoichiometric air-fuel ratio×set excess air ratio) ].
As a preferred technical scheme of the gas injection correction method of the gas engine, the method for correcting the mass flow rate of the obtained required gas is as follows: the mass flow of the resulting gas is multiplied by an excess air factor closed loop control factor.
A gas engine employing the gas engine gas injection correction method according to any one of the above.
The invention has the beneficial effects that:
the invention provides a gas engine gas injection correction method, which comprises the steps of firstly calculating the volume flow of a mixed gas entering a cylinder, simultaneously obtaining the actual air-fuel ratio of the mixed gas, and calculating the density of the mixed gas entering the cylinder according to the actual air-fuel ratio of the mixed gas; then multiplying the volume flow of the mixed gas by the density of the mixed gas to obtain the mass flow of the mixed gas; then calculating the mass flow of the fuel gas according to the mass flow of the mixed gas, and correcting the obtained mass flow of the fuel gas; the corrected mass flow of fuel gas is then sent to the fuel gas injection device. According to the gas engine gas injection correction method provided by the invention, the density of the mixed gas is calculated, and the mass flow of the mixed gas is obtained by multiplying the density of the mixed gas by the volume flow of the mixed gas, compared with the mass flow of the mixed gas obtained by multiplying the density of air by the volume flow of the mixed gas in the prior art, the result is more accurate, so that the required gas injection quantity can be calculated and controlled more accurately, and the engine performance can be improved.
Drawings
Fig. 1 is a flowchart of a gas injection correction method for a gas engine according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
As shown in FIG. 1, the invention provides a gas injection correction method for a gas engine, wherein the gas engine is generally characterized in that gas and air are mixed at the upstream of a compressor of a supercharger and then enter the supercharger, and then enter an engine combustion chamber through an intercooler, a throttle valve and an air inlet cavity; the fuel gas and control of the fuel gas engine are mixed at the downstream of the supercharger and then enter the combustion chamber of the engine through the intercooler, the throttle valve and the air inlet cavity; still other gas engines inject fuel directly into the cylinder. The gas engine gas injection correction method provided by the invention is mainly applied to a gas engine of direct injection gas in a non-cylinder. The gas injection correction method of the gas engine comprises the following steps:
s11, calculating the volume flow of the mixed gas entering the cylinder.
In this embodiment, the method of calculating the volumetric flow rate of the mixture gas entering the cylinder is calculated by a velocity density method. The calculation formula of the speed density method is as follows:wherein: q (Q) mix The volume flow (L/s) of the mixed gas, n is the engine speed (r/min), eta vol For the charging efficiency, V is the engine displacement (L), MAP is the pressure in the intake pipe (kPA), and MAT is the temperature of the gaseous matter in the intake pipe (K). The method has the advantages that the obtained result of the volume flow of the mixed gas is accurate, and the implementation is simple. Of course, the method of calculating the volumetric flow rate of the mixture is not limited to this, and may be obtained by calculation of the throttle opening and the like, and will not be described in detail here.
S12, simultaneously acquiring the actual air-fuel ratio of the mixture, and calculating the density of the mixture entering the cylinder according to the actual air-fuel ratio of the mixture.
In the present embodiment, the method of acquiring the actual air-fuel ratio of the mixture is: the concentration of oxygen in the exhaust gas is obtained, and the excess air ratio is obtained from the concentration of oxygen in the exhaust gas, and then the actual air-fuel ratio of the mixture is obtained by multiplying the excess air ratio by the stoichiometric air-fuel ratio of the mixture. Preferably, the concentration of oxygen in the exhaust gas is obtained by using an oxygen sensor, and the obtained result is accurate and easy to implement. In addition, a nitrogen oxide sensor may be used to obtain the concentration of nitrogen oxides in the exhaust gas, and the excess air ratio may be obtained from the concentration of nitrogen oxides in the exhaust gas.
The stoichiometric air-fuel ratio (also referred to as stoichiometric ratio) refers to the mass ratio of air to fuel at which the fuel is just burned and exhausted. The theoretical air-fuel ratio of the gasoline is 14.7:1, namely, when the air quality is 14.7, the quality of the gasoline is 1, and the gasoline is just burnt out. I.e. 14.7g of air are required to burn 1g of gasoline. However, in practical use, the ratio of the air quantity actually supplied for combustion of the fuel to the theoretical air quantity is the excess air ratio, and the ratio of the air mass actually supplied to the fuel mass is the actual air-fuel ratio, so that the fuel is combusted as completely as possible. The actual air-fuel ratio can be obtained by multiplying the stoichiometric air-fuel ratio by the excess air ratio.
In the present embodiment, the method of calculating the density of the mixture gas entering the cylinder from the actual air-fuel ratio of the mixture gas is as follows: the sum of the value obtained by multiplying the ratio of the air mass to the total mass of the mixed gas by the density of the air and the value obtained by multiplying the ratio of the gas mass to the total mass of the mixed gas by the density of the gas is the density of the mixed gas. The calculation method is simple, and the calculation result is accurate.
And S20, multiplying the volume flow of the mixed gas by the density of the mixed gas to obtain the mass flow of the mixed gas.
The mass flow of the mixed gas is obtained by calculating the density of the mixed gas and multiplying the volume flow of the mixed gas by the density of the mixed gas, and compared with the mass flow of the mixed gas obtained by multiplying the volume flow of the mixed gas by the density of air in the prior art, the mass flow of the mixed gas is more accurate.
S30, calculating the mass flow of the fuel gas according to the mass flow of the mixed gas, and correcting the obtained mass flow of the fuel gas;
in this embodiment, the formula for calculating the required mass flow rate of the fuel gas according to the mass flow rate of the mixture is: the required mass flow rate of fuel gas=the mass flow rate of the mixture ++1 (stoichiometric air-fuel ratio×set excess air ratio) ].
In this embodiment, the method for correcting the mass flow rate of the obtained required fuel gas is as follows: and multiplying the mass flow of the obtained fuel gas by an excess air coefficient closed-loop control factor to obtain a corrected value. The excess air factor closed-loop control factor is a factor based on the difference between the set excess air factor and the actual excess air factor, and then enters the PID controller to be output.
And S40, transmitting the corrected mass flow rate of the fuel gas to a fuel gas injection device.
The gas injection device can inject the gas according to the corrected mass flow of the gas, so that the injected gas is more accurate in quality, and further the performance of the engine is improved.
The invention also provides a gas engine, and the gas engine gas injection correction method is adopted. By adopting the method for calculating the mass flow of the gas mixture of the gas engine, the calculated mass flow of the gas mixture has higher accuracy, thereby being beneficial to improving the performance of the gas engine.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. A gas engine fuel gas injection correction method is characterized in that firstly, the volume flow of the mixture entering a cylinder is calculated, meanwhile, the actual air-fuel ratio of the mixture is obtained, and the density of the mixture entering the cylinder is calculated according to the actual air-fuel ratio of the mixture; then multiplying the volume flow of the mixed gas by the density of the mixed gas to obtain the mass flow of the mixed gas; then calculating the mass flow of the fuel gas according to the mass flow of the mixed gas, and correcting the obtained mass flow of the fuel gas; then, the corrected mass flow of the fuel gas is sent to a fuel gas injection device;
the method for calculating the density of the mixture entering the cylinder according to the actual air-fuel ratio of the mixture is as follows: multiplying the ratio of the air volume to the total volume of the mixed gas by the density of the air and the ratio of the gas volume to the total volume of the mixed gas by the density of the gas;
the method for calculating the volume flow of the mixed gas entering the cylinder is obtained by calculating a speed density method;
the formula for calculating the volume flow of the mixture entering the cylinder by the speed density method is as follows:
wherein: q (Q) mix The volume flow (L/s) of the mixed gas, n is the engine speed (r/min), eta vol For the air charging efficiency, V is the engine displacement (L), MAP is the pressure (kPA) in the air inlet pipe, and MAT is the temperature (K) of gaseous substances in the air inlet pipe;
the formula for calculating the mass flow rate of the required fuel gas according to the mass flow rate of the mixed gas is as follows:
the required mass flow rate of fuel gas=the mass flow rate of the mixture ++1 (stoichiometric air-fuel ratio×set excess air ratio) ].
2. The gas engine fuel injection correction method according to claim 1, wherein the method of obtaining the actual air-fuel ratio of the mixture is: the concentration of oxygen in the exhaust gas is obtained, and the excess air ratio is obtained from the concentration of oxygen in the exhaust gas, and then the excess air ratio is multiplied by the stoichiometric air-fuel ratio of the mixture.
3. The gas engine fuel gas injection correction method according to claim 2, wherein the concentration of oxygen in the exhaust gas is obtained using an oxygen sensor.
4. The gas engine fuel gas injection correction method according to claim 1, wherein the method of correcting the mass flow rate of the obtained demanded fuel gas is: the mass flow of the resulting gas is multiplied by an excess air factor closed loop control factor.
5. A gas engine, characterized in that the gas engine gas injection correction method according to any one of claims 1 to 4 is employed.
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| CN202110679060.0A CN113202652B (en) | 2021-06-18 | 2021-06-18 | Gas engine gas injection correction method and gas engine |
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| CN114720133B (en) * | 2022-04-19 | 2024-06-18 | 潍柴动力股份有限公司 | Calibration method and calibration system for air-fuel ratio of high-power gas engine |
| CN115045743A (en) * | 2022-04-27 | 2022-09-13 | 东风柳州汽车有限公司 | GPF-based oxygen flow calculation method, device, equipment and storage medium |
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