CN114720133A - Calibration method and calibration system for air-fuel ratio of high-power gas engine - Google Patents
Calibration method and calibration system for air-fuel ratio of high-power gas engine Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 130
- 239000001301 oxygen Substances 0.000 claims abstract description 35
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000012937 correction Methods 0.000 claims description 25
- 238000012423 maintenance Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002737 fuel gas Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000010408 sweeping Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002440 industrial waste Substances 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
- 238000010248 power generation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a calibration method and a calibration system for the air-fuel ratio of a high-power gas engine, which are characterized in that the gas engine is controlled to operate under a calibration working condition to obtain gas flow, air flow and real-time air leakage flow, and the air leakage flow is made to be the real-time air leakage flow; calculating an air-fuel ratio according to the gas flow and the air flow; and marking the leakage gas flow and the air-fuel ratio in a coordinate system with the leakage gas flow and the air-fuel ratio as coordinates, forming a map of the leakage gas flow and the air-fuel ratio under a calibration working condition when a relation graph of the leakage gas flow and the air-fuel ratio is formed in the coordinate system, and repeating the steps after maintaining or changing the calibration working condition when the relation graph is not formed in the coordinate system. Therefore, the air-fuel ratio is calibrated by utilizing the relation between the air leakage flow and the air-fuel ratio under different working conditions, the technical problem of calibrating the air-fuel ratio by utilizing an oxygen sensor in the prior art is solved, and the calibration method disclosed by the invention has the advantages of high operation reliability, easiness in implementation and stable operation.
Description
Technical Field
The invention relates to the technical field of gas machines, in particular to a method and a system for calibrating the air-fuel ratio of a high-power gas machine.
Background
In the control of the high-power lean-burn gas engine, the air-fuel ratio control is always an important parameter, namely the ratio of air to fuel gas needs to be determined, and the air-fuel ratio needs to be measured. At present, an oxygen sensor installed in an exhaust system is generally used to measure the oxygen content after high-temperature combustion and then calculate the air-fuel ratio. However, the oxygen sensor has the drift problem, and in the application of the vehicle with the natural gas engine, the oxygen sensor is calibrated in the atmosphere and the measurement is recovered mainly in the fuel cut-off process of the engine. However, in the application of continuous power generation, the engine must be stopped by adopting the fuel cut, and the running efficiency of the engine is influenced. In addition, the use of oxygen sensors in high temperature environments can reduce the lifetime and be costly to maintain.
The gas engine is a system capable of burning combustible gas such as natural gas, methane, industrial waste gas and the like to generate kinetic energy, and belongs to one type of engine.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: the air-fuel ratio is calibrated through the leakage flow, and the technical problem of controlling the air-fuel ratio by the oxygen sensor is solved.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for calibrating the air-fuel ratio of a high-power gas engine comprises the following steps:
s1, controlling the gas engine to operate under a calibration working condition;
s2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
s3, calculating an air-fuel ratio according to the gas flow and the air flow;
s4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
s5, after the calibration working condition is maintained or changed, executing S1;
s6, the relational graph is a map of the leakage air flow and the air-fuel ratio under the calibration working condition.
Preferably, the calibration working condition is power;
the S1 is as follows: controlling the gas engine to operate under the calibrated power;
the S5 is as follows: keeping the power unchanged, and then executing S1;
the S6 is as follows: the map is a first map of the blow-by gas flow rate and the air-fuel ratio at constant horsepower.
Preferably, the calibration working condition comprises power and rotating speed;
the S1 is as follows: controlling the gas engine to operate under the conditions of the calibrated power and the calibrated rotating speed;
the S5 is as follows: changing the calibration power and the calibration rotating speed, and then executing S1;
the S6 is: the map is a second map of blow-by gas flow and air-fuel ratio at different power and at different rotational speeds.
Preferably, the calibration working condition comprises the pressure and the rotating speed of the air inlet pipe;
the S1 is as follows: controlling the gas engine to operate under the conditions of calibrating the pressure of the air inlet pipe and calibrating the rotating speed;
the S5 is as follows: changing the pressure of the calibrated air inlet pipe and the calibrated rotating speed, and then executing S1;
the S6 is as follows: the map is a third map of the blow-by gas flow rate and the air-fuel ratio at different intake pipe pressures and different rotational speeds.
Preferably, the S2 further includes a calibration correction step, specifically:
s20, judging whether the maintenance cycle is a regular maintenance cycle;
s21, if not, acquiring the gas flow, the air flow and the real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
if yes, acquiring gas flow, air flow, real-time air leakage flow and an operation time correction coefficient K, and enabling the air leakage flow to be K x real-time air leakage flow.
Preferably, the air-fuel ratio is represented by the formula λ ═ Qair/(QgasLHV), where λ is the air-fuel ratio, QairIs the air flow rate, QgasThe LHV is the low heating value of the fuel gas.
A calibration system for the air-fuel ratio of a high-power gas engine comprises a control unit and a calibration unit, wherein the control unit is electrically connected with the control unit respectively: the gas flow valve is used for collecting gas flow under a calibration working condition and transmitting a gas electric signal corresponding to the gas flow to the control unit; the gas flow valve is used for collecting the air flow of the inlet air under the calibration working condition and transmitting an air electric signal corresponding to the air flow to the control unit; the air-fuel ratio calculating unit is used for calculating the air-fuel ratio according to the gas electric signal and the air electric signal transmitted by the control unit and transmitting the air-fuel ratio electric signal to the control unit; the air leakage flow measuring instrument is used for obtaining real-time air leakage flow under a calibration working condition and transmitting a corresponding air leakage electric signal to the control unit, and the control unit obtains the air leakage flow by using a formula air leakage flow which is the real-time air leakage flow; and the calibration unit marks the air leakage flow and the air leakage flow in a coordinate system with the air leakage flow and the air leakage ratio as coordinates after receiving the air-fuel ratio electrical signal and the air leakage flow electrical signal transmitted by the control unit until a relational graph of the air leakage flow and the air-fuel ratio is obtained in the coordinate system, wherein the relational graph is a map of the air leakage flow and the air-fuel ratio under a calibration working condition.
Preferably, the calibration system further comprises a correction unit electrically connected with the control unit, and the correction unit is used for acquiring an operating time correction coefficient K after a periodic maintenance cycle is reached and transmitting the correction coefficient K to the control unit; and the control unit corrects the real-time air leakage flow by using the formula air leakage flow K.
Preferably, the calibration system further comprises an oxygen sensor starting unit electrically connected with the control unit, wherein the oxygen sensor starting unit is used for starting the oxygen sensor during maintenance, controlling the air-fuel ratio through an oxygen sensor pair, and closing the oxygen sensor after the maintenance is finished.
Preferably, the calibration unit calibrates map maps of air leakage flow and air-fuel ratio under different calibration conditions according to the different calibration conditions.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the calibration method and the calibration system for the air-fuel ratio of the high-power gas engine, the gas engine is controlled to operate under the calibration working condition, so that the gas flow, the air flow and the real-time air leakage flow are obtained, and the air leakage flow is equal to the real-time air leakage flow; calculating an air-fuel ratio according to the gas flow and the air flow; and marking the leakage gas flow and the air-fuel ratio in a coordinate system with the leakage gas flow and the air-fuel ratio as coordinates, forming a map of the leakage gas flow and the air-fuel ratio under a calibration working condition when a relation graph of the leakage gas flow and the air-fuel ratio is formed in the coordinate system, and repeating the steps after maintaining or changing the calibration working condition when the relation graph is not formed in the coordinate system. Therefore, the air-fuel ratio is calibrated by utilizing the relation between the air leakage flow and the air-fuel ratio under different working conditions, the technical problem of calibrating the air-fuel ratio by utilizing an oxygen sensor in the prior art is solved, and the calibration method disclosed by the invention has the advantages of high operation reliability, easiness in implementation and stable operation.
Drawings
FIG. 1 is a schematic flow chart of a method for calibrating an air-fuel ratio of a high-power gas engine;
FIG. 2 is a map of blow-by gas flow and air-fuel ratio in the present invention;
FIG. 3 is a block diagram of a high power gas engine;
FIG. 4 is a functional block diagram of a system for calibrating the air-fuel ratio of a high power gas engine;
in the figure: 1-air filter, 2-mixer, 3-gas metering valve, 4-supercharger, 5-intercooler, 6-electronic throttle valve, 7-oil-gas separator, 8-air leakage flow measuring instrument, 9-tail pipe, 10-oxygen sensor, 11-air inlet pipe, 12-exhaust pipe and 13-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, a method for calibrating an air-fuel ratio of a high-power gas engine is applied to a system for calibrating an air-fuel ratio of a high-power gas engine described in the second embodiment, and the method for calibrating an air-fuel ratio of a high-power gas engine includes the following steps:
step S1, controlling the gas engine to operate under a calibration working condition;
step S2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow; in this embodiment, step S2 further includes a calibration correction step, which specifically includes:
step S20, judging whether the maintenance cycle is a regular maintenance cycle; the maintenance period is usually 1000-2000h, after the maintenance is finished and the test is started again, the oxygen sensing test function is started, and the oxygen sensing test air-fuel ratio function is closed after the maintenance is finished;
step S21, if not (the maintenance cycle is not a regular maintenance cycle), acquiring gas flow, air flow and real-time air leakage flow, and making the air leakage flow equal to the real-time air leakage flow;
if so (the maintenance period is a regular maintenance period), acquiring gas flow, air flow, real-time air leakage flow and an operating time correction coefficient K, and enabling the air leakage flow to be K x real-time air leakage flow;
step S3, calculating the air-fuel ratio according to the gas flow and the air flow; wherein the air-fuel ratio is represented by the formula λ ═ Qair/(QgasLHV), where λ is the air-fuel ratio, QairIs the air flow rate, QgasFor gas flow, LHV is the lower heating value of the gas, and for a given gas, LHV is constant.
Step S4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
step S5, after the calibration working condition is maintained or changed, S1 is executed, namely the steps are repeated until a relation graph is formed;
step S6, making a map of the leakage air flow rate and the air-fuel ratio under a calibration condition, where the relationship between the leakage air flow rate and the air-fuel ratio in the map is λ ═ f (qleak); the corrected blowby gas flow rate and air-fuel ratio are in a relationship of λ ═ K × f (qleak), qleak is the blowby gas flow rate, and λ is the air-fuel ratio.
The invention obtains the relation between the corresponding air leakage flow and the air-fuel ratio by controlling the gas engine to operate under the calibration working condition, establishes the relation in the coordinate system, and obtains the relation between the corresponding air leakage flow and the air-fuel ratio in the coordinate system by controlling the calibration working condition until a relation graph is formed in the coordinate system, thereby completing the calibration of the air-fuel ratio. Therefore, the air-fuel ratio is calibrated by mainly utilizing the leakage flow, the technical problem of calibrating the air-fuel ratio by utilizing an oxygen sensor in the prior art is solved, and the calibration method has the advantages of high operation reliability, easiness in realization and stable operation.
When the calibration working condition is power:
step S1 is: controlling the gas engine to operate under the calibrated power;
step S2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
step S3, calculating the air-fuel ratio according to the gas flow and the air flow;
step S4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
step S5 is: keeping the power unchanged, and then executing step S1;
step S6 is: the map is a first map of the blow-by gas flow rate and the air-fuel ratio at constant horsepower.
And (3) calibration under a constant power working condition, namely performing air-fuel ratio sweeping through the steps, and finally forming a first map in a coordinate system.
When the calibration conditions include power and rotation speed:
step S1 is: controlling the gas engine to operate under the conditions of the calibrated power and the calibrated rotating speed;
step S2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
step S3, calculating the air-fuel ratio according to the gas flow and the air flow;
step S4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
step S5 is: changing the calibration power and the calibration rotating speed, and then executing S1;
step S6 is: the map is a second map of blow-by gas flow and air-fuel ratio at different power and different rotational speed.
And adjusting power and rotating speed, and performing air-fuel ratio point sweeping under different powers and different rotating speeds to finally obtain a second map of air-fuel ratio and air leakage flow under different powers and different rotating speeds.
When the calibration conditions include intake pipe pressure and speed:
s1 is: controlling the gas engine to operate under the conditions of calibrating the pressure of the air inlet pipe and calibrating the rotating speed;
step S2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
step S3, calculating the air-fuel ratio according to the gas flow and the air flow;
step S4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
s5 is: changing the pressure of the calibrated air inlet pipe and the calibrated rotating speed, and then executing S1;
s6 is: the relationship diagram is a third map of the blow-by gas flow and the air-fuel ratio at different intake pipe pressures and different rotational speeds.
And adjusting the pressure and the rotating speed of the air inlet pipe, and performing air-fuel ratio point sweeping under different pressures and different rotating speeds of the air inlet pipe to finally obtain a third map of the air-fuel ratio and the air leakage flow under different pressures and rotating speeds of the air inlet pipe.
In summary, according to the relationship between the air leakage flow and the air-fuel ratio under different calibrated rotating speeds, and the relationship between the air leakage flow and the air-fuel ratio under different powers or different air inlet pipe pressures, the corresponding calibration model is obtained according to the relationship between the air-fuel ratio and the air leakage flow. And then operating a maintenance period, then performing operation period correction calibration, after the maintenance is completed and the engine is restarted, loading the engine to a certain load, starting an air-fuel ratio testing function of the oxygen sensor, performing operation period calibration on the air leakage flow to obtain an operation period correction coefficient k, and then closing the testing function of the oxygen sensor.
Example two:
as shown in fig. 3 and 4, the system for calibrating the air-fuel ratio of the high-power gas engine comprises an air filter 1, a mixer 2, a supercharger 4, an intercooler 5, an electronic throttle valve 6, an oil-gas separator 7, an exhaust tail pipe 9, an oxygen sensor 10, an air inlet pipe 11 and an exhaust pipe 12.
The calibration system comprises a control unit, a gas flow valve 3, an air flow valve, an air-fuel ratio calculation unit, a gas leakage flow measuring instrument 8, a calibration unit, a correction unit and an oxygen sensor starting unit, wherein the gas flow valve, the air-fuel ratio calculation unit, the gas leakage flow measuring instrument, the calibration unit, the correction unit and the oxygen sensor starting unit are respectively and electrically connected with the control unit.
The gas flow valve is used for collecting gas flow under a calibration working condition and transmitting a gas electric signal corresponding to the gas flow to the control unit;
the gas flow valve is used for collecting intake air flow under a calibration working condition and transmitting an air electric signal corresponding to the air flow to the control unit;
the air-fuel ratio calculation unit is used for calculating the air-fuel ratio according to the gas electric signal and the air electric signal transmitted by the control unit and transmitting the air-fuel ratio electric signal to the control unit; the air-fuel ratio is represented by the formula λ ═ Qair/(QgasLHV), where λ is the air-fuel ratio, QairIs the air flow rate, QgasFor gas flow, LHV is the lower heating value of the gas, and for a given gas, LHV is constant.
The air leakage flow measuring instrument is used for obtaining real-time air leakage flow under a calibration working condition and transmitting a corresponding air leakage electric signal to the control unit, and the control unit obtains the air leakage flow by using a formula air leakage flow which is the real-time air leakage flow;
after receiving the air-fuel ratio electrical signal and the air leakage flow electrical signal transmitted by the control unit, the calibration unit marks the air leakage flow and the air-fuel ratio in a coordinate system with coordinates until a relational graph of the air leakage flow and the air-fuel ratio is obtained in the coordinate system, wherein the relational graph is a map of the air leakage flow and the air-fuel ratio under a calibration working condition; and the calibration unit calibrates map maps of the air leakage flow and the air-fuel ratio under different calibration working conditions according to the different calibration working conditions.
The correction unit is used for acquiring an operating time correction coefficient K after a periodic maintenance cycle is up, and transmitting the correction coefficient K to the control unit; and the control unit corrects the real-time leakage flow by using the formula leakage flow K.
The oxygen sensor starting unit is used for starting the oxygen sensor during maintenance, controlling the air-fuel ratio through the oxygen sensor pair, and closing the oxygen sensor after the maintenance is finished.
When the calibration system of the air-fuel ratio of the high-power gas engine is used, the control unit controls the gas engine to operate under a calibration working condition, the gas flow is collected through the gas flow valve, the air flow is collected through the air flow valve, the air leakage flow under the calibration working condition is obtained through the air leakage flow measuring instrument, then the gas electric signal and the air electric signal are transmitted to the air-fuel ratio calculation unit, the air-fuel ratio is calculated through the air-fuel ratio calculation unit, the air-fuel ratio correction unit is started to correct the air leakage flow, then the air-fuel ratio electric signal and the air leakage electric signal are respectively transmitted to the calibration unit, the calibration unit marks the air-fuel ratio and the air leakage flow in a coordinate system, then the control unit keeps or changes the calibration working condition, the operation is repeated, the corresponding air leakage flow and the air-fuel ratio are marked in the coordinate system until a relation graph of the air leakage flow and the air-fuel ratio is formed in the coordinate system, and finishing the calibration of the leakage flow and the air-fuel ratio under the calibration working condition to obtain a map under the corresponding calibration working condition.
In the actual calibration process, the control unit obtains a first map under the working condition of constant power, obtains a second map under different powers and different rotating speeds, and obtains a third map under different intake pipe pressures and different rotating speeds.
After the calibration system is put into use, the air-fuel ratio can be controlled according to the working conditions.
Therefore, the invention solves the technical problem of controlling the air-fuel ratio by using the oxygen sensor in the prior art, and the system has reliable operation and is simple and easy to realize.
In addition, after the correction unit is started, the oxygen sensor starting unit is started at the same time, so that the oxygen sensor works to control the air-fuel ratio in the process of acquiring the operating time correction coefficient k, and after the correction is finished, the oxygen sensor testing function is closed.
The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent to the calibration method and the calibration system of the air-fuel ratio of the high-power gas engine, which are within the spirit and principle of the present invention, should be included in the protection scope of the present invention.
Claims (10)
1. A method for calibrating the air-fuel ratio of a high-power gas engine is characterized by comprising the following steps:
s1, controlling the gas engine to operate under a calibration working condition;
s2, acquiring gas flow, air flow and real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
s3, calculating an air-fuel ratio according to the gas flow and the air flow;
s4, marking the leakage air flow rate and the air-fuel ratio in a coordinate system with the leakage air flow rate and the air-fuel ratio as coordinates, executing S6 when a relation graph of the leakage air flow rate and the air-fuel ratio is formed in the coordinate system, and otherwise executing S5;
s5, after the calibration working condition is maintained or changed, executing S1;
s6, the relational graph is a map of the leakage air flow and the air-fuel ratio under the calibration working condition.
2. The method for calibrating the air-fuel ratio of the high-power gas engine as recited in claim 1, wherein the calibration condition is power;
the S1 is as follows: controlling the gas engine to operate under the calibrated power;
the S5 is: keeping the power unchanged, and then executing S1;
the S6 is as follows: the map is a first map of the blow-by gas flow rate and the air-fuel ratio at constant horsepower.
3. The method for calibrating the air-fuel ratio of the high-power gas engine as recited in claim 1, wherein the calibration conditions comprise power and rotation speed;
the S1 is as follows: controlling the gas engine to operate under the conditions of the calibrated power and the calibrated rotating speed;
the S5 is as follows: changing the calibration power and the calibration rotating speed, and then executing S1;
the S6 is as follows: the map is a second map of blow-by gas flow and air-fuel ratio at different power and at different rotational speeds.
4. The method for calibrating the air-fuel ratio of the high-power gas engine as recited in claim 1, wherein the calibration condition comprises an intake pipe pressure and a rotating speed;
the S1 is: controlling the gas engine to operate under the conditions of calibrating the pressure of the air inlet pipe and calibrating the rotating speed;
the S5 is as follows: changing the pressure of the calibrated air inlet pipe and the calibrated rotating speed, and then executing S1;
the S6 is as follows: the map is a third map of the blow-by gas flow rate and the air-fuel ratio at different intake pipe pressures and different rotational speeds.
5. The method for calibrating the air-fuel ratio of a high-power gas engine as recited in any one of claims 1 to 4, wherein the step S2 further comprises a calibration correction step, specifically:
s20, judging whether the maintenance cycle is a regular maintenance cycle;
s21, if not, acquiring the gas flow, the air flow and the real-time air leakage flow, and enabling the air leakage flow to be the real-time air leakage flow;
if yes, acquiring gas flow, air flow, real-time air leakage flow and an operation time correction coefficient K, and enabling the air leakage flow to be K x real-time air leakage flow.
6. The method for calibrating the air-fuel ratio of a high-power gas engine as claimed in claim 5, wherein the air-fuel ratio is represented by the formula λ Qair/(QgasLHV) calculationIs obtained, where λ is the air-fuel ratio, QairIs the air flow rate, QgasThe LHV is the low heating value of the fuel gas.
7. The system for calibrating the air-fuel ratio of the high-power gas engine is characterized by comprising a control unit and a calibration unit, wherein the calibration unit is respectively electrically connected with the control unit:
the gas flow valve is used for collecting gas flow under a calibration working condition and transmitting a gas electric signal corresponding to the gas flow to the control unit;
the gas flow valve is used for collecting the air flow of the inlet air under the calibration working condition and transmitting an air electric signal corresponding to the air flow to the control unit;
the air-fuel ratio calculating unit is used for calculating the air-fuel ratio according to the gas electric signal and the air electric signal transmitted by the control unit and transmitting the air-fuel ratio electric signal to the control unit;
the air leakage flow measuring instrument is used for obtaining real-time air leakage flow under a calibration working condition and transmitting a corresponding air leakage electric signal to the control unit, and the control unit obtains the air leakage flow by using a formula air leakage flow which is the real-time air leakage flow;
and the calibration unit marks the air leakage flow and the air leakage flow in a coordinate system with the air leakage flow and the air leakage ratio as coordinates after receiving the air-fuel ratio electrical signal and the air leakage flow electrical signal transmitted by the control unit until a relational graph of the air leakage flow and the air-fuel ratio is obtained in the coordinate system, wherein the relational graph is a map of the air leakage flow and the air-fuel ratio under a calibration working condition.
8. The system for calibrating the air-fuel ratio of a high-power gas engine as claimed in claim 7, further comprising a correction unit electrically connected to the control unit, wherein the correction unit is configured to obtain an operating time correction coefficient K after a periodic maintenance cycle is completed, and transmit the correction coefficient K to the control unit;
and the control unit corrects the real-time leakage flow by using the formula leakage flow (K) real-time leakage flow.
9. The system for calibrating the air-fuel ratio of a high power gas engine as recited in claim 7, further comprising an oxygen sensor start unit electrically connected to the control unit, wherein the oxygen sensor start unit is used for starting the oxygen sensor during maintenance, controlling the air-fuel ratio through the oxygen sensor pair, and turning off the oxygen sensor after the maintenance is completed.
10. The system for calibrating the air-fuel ratio of a high-power gas engine as recited in claim 7, wherein the calibration unit calibrates map maps of the leakage flow and the air-fuel ratio under different calibration conditions according to different calibration conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210408999.8A CN114720133A (en) | 2022-04-19 | 2022-04-19 | Calibration method and calibration system for air-fuel ratio of high-power gas engine |
| PCT/CN2023/080448 WO2023202253A1 (en) | 2022-04-19 | 2023-03-09 | Air-fuel ratio calibration method and calibration system of high-power gas engine |
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| CN202210408999.8A CN114720133A (en) | 2022-04-19 | 2022-04-19 | Calibration method and calibration system for air-fuel ratio of high-power gas engine |
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| WO2023202253A1 (en) * | 2022-04-19 | 2023-10-26 | 潍柴动力股份有限公司 | Air-fuel ratio calibration method and calibration system of high-power gas engine |
Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6287726A (en) * | 1985-10-11 | 1987-04-22 | Yokoi Kikai Kosakusho:Kk | Air-fuel ratio control system in burning device |
| JPH02308950A (en) * | 1989-05-25 | 1990-12-21 | Japan Electron Control Syst Co Ltd | Air leakage self-diagnostic device for control device of internal combustion engine and air leakage learning correcting device |
| JPH03167467A (en) * | 1989-11-28 | 1991-07-19 | Ngk Insulators Ltd | Air/fuel ratio sensor |
| JPH05280403A (en) * | 1992-03-31 | 1993-10-26 | Toyota Motor Corp | Device for detecting intake-air leakage from air intake system in engine of vehicle |
| US5469827A (en) * | 1993-02-02 | 1995-11-28 | Unisia Jecs Corporation | Method and apparatus for control of the start-up air-fuel ratio of an internal combustion engine |
| JPH09242587A (en) * | 1996-03-08 | 1997-09-16 | Suzuki Motor Corp | Air-fuel ratio control device for internal combustion engine |
| US20040261498A1 (en) * | 2003-06-04 | 2004-12-30 | Toyota Jidosha Kabushiki Kaisha | Abnormality detection device for air-fuel ratio sensor |
| JP2007009845A (en) * | 2005-07-01 | 2007-01-18 | Toyota Motor Corp | Air-fuel ratio controller of internal combustion engine |
| US7171960B1 (en) * | 2005-11-28 | 2007-02-06 | Mitsubishi Denki Dabushiki Kaisha | Control apparatus for an internal combustion engine |
| JP2013080362A (en) * | 2011-10-04 | 2013-05-02 | Nippon Telegr & Teleph Corp <Ntt> | Dialogue type information transmission device, dialogue type information transmission method, and program |
| US20140316678A1 (en) * | 2011-11-24 | 2014-10-23 | Toyota Jidosha Kabushiki Kaisha | Air-fuel ratio detection device and air-fuel ratio detection method |
| JP2017008721A (en) * | 2015-06-16 | 2017-01-12 | 愛三工業株式会社 | Blow-by gas control device |
| JP2017115802A (en) * | 2015-12-25 | 2017-06-29 | トヨタ自動車株式会社 | Air fuel ratio controller for internal combustion engine |
| CN107110044A (en) * | 2014-12-19 | 2017-08-29 | 丰田自动车株式会社 | The abnormity diagnostic system of air-fuel ratio sensor |
| CN109209661A (en) * | 2018-10-13 | 2019-01-15 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine plateau power compensating for loss and damage control method |
| CN110630396A (en) * | 2019-09-30 | 2019-12-31 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN110671218A (en) * | 2019-09-30 | 2020-01-10 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN110671219A (en) * | 2019-12-05 | 2020-01-10 | 潍柴动力股份有限公司 | Method and system for controlling air-fuel ratio of gas engine |
| CN112081677A (en) * | 2020-08-28 | 2020-12-15 | 奇瑞汽车股份有限公司 | Air-fuel ratio control method and device |
| CN112594073A (en) * | 2020-12-15 | 2021-04-02 | 潍柴动力股份有限公司 | Control method of air-fuel ratio of engine and engine |
| CN112664319A (en) * | 2020-12-25 | 2021-04-16 | 航天时代飞鸿技术有限公司 | Control system and fault diagnosis method for aviation piston two-stroke supercharged engine |
| CN113202652A (en) * | 2021-06-18 | 2021-08-03 | 潍柴动力股份有限公司 | Gas engine gas injection correction method and gas engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05163993A (en) * | 1991-12-10 | 1993-06-29 | Japan Electron Control Syst Co Ltd | Detecting device for generation of blow-by gas and diagnostic device for abnormality of fuel supply system in internal combustion engine |
| JPH06288265A (en) * | 1993-04-02 | 1994-10-11 | Tokyo Gas Co Ltd | Air-fuel ratio control method and device for gas engine |
| JP3531221B2 (en) * | 1994-08-26 | 2004-05-24 | 日産自動車株式会社 | Air-fuel ratio control device for internal combustion engine |
| CN114720133A (en) * | 2022-04-19 | 2022-07-08 | 潍柴动力股份有限公司 | Calibration method and calibration system for air-fuel ratio of high-power gas engine |
-
2022
- 2022-04-19 CN CN202210408999.8A patent/CN114720133A/en active Pending
-
2023
- 2023-03-09 WO PCT/CN2023/080448 patent/WO2023202253A1/en unknown
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6287726A (en) * | 1985-10-11 | 1987-04-22 | Yokoi Kikai Kosakusho:Kk | Air-fuel ratio control system in burning device |
| JPH02308950A (en) * | 1989-05-25 | 1990-12-21 | Japan Electron Control Syst Co Ltd | Air leakage self-diagnostic device for control device of internal combustion engine and air leakage learning correcting device |
| US5007399A (en) * | 1989-05-25 | 1991-04-16 | Japan Electronic Control Systems Co., Ltd. | Method and apparatus for self-diagnosis of air leakage in control system of internal combustion engine |
| JPH03167467A (en) * | 1989-11-28 | 1991-07-19 | Ngk Insulators Ltd | Air/fuel ratio sensor |
| JPH05280403A (en) * | 1992-03-31 | 1993-10-26 | Toyota Motor Corp | Device for detecting intake-air leakage from air intake system in engine of vehicle |
| US5469827A (en) * | 1993-02-02 | 1995-11-28 | Unisia Jecs Corporation | Method and apparatus for control of the start-up air-fuel ratio of an internal combustion engine |
| JPH09242587A (en) * | 1996-03-08 | 1997-09-16 | Suzuki Motor Corp | Air-fuel ratio control device for internal combustion engine |
| US20040261498A1 (en) * | 2003-06-04 | 2004-12-30 | Toyota Jidosha Kabushiki Kaisha | Abnormality detection device for air-fuel ratio sensor |
| JP2007009845A (en) * | 2005-07-01 | 2007-01-18 | Toyota Motor Corp | Air-fuel ratio controller of internal combustion engine |
| US7171960B1 (en) * | 2005-11-28 | 2007-02-06 | Mitsubishi Denki Dabushiki Kaisha | Control apparatus for an internal combustion engine |
| JP2013080362A (en) * | 2011-10-04 | 2013-05-02 | Nippon Telegr & Teleph Corp <Ntt> | Dialogue type information transmission device, dialogue type information transmission method, and program |
| US20140316678A1 (en) * | 2011-11-24 | 2014-10-23 | Toyota Jidosha Kabushiki Kaisha | Air-fuel ratio detection device and air-fuel ratio detection method |
| CN107110044A (en) * | 2014-12-19 | 2017-08-29 | 丰田自动车株式会社 | The abnormity diagnostic system of air-fuel ratio sensor |
| JP2017008721A (en) * | 2015-06-16 | 2017-01-12 | 愛三工業株式会社 | Blow-by gas control device |
| JP2017115802A (en) * | 2015-12-25 | 2017-06-29 | トヨタ自動車株式会社 | Air fuel ratio controller for internal combustion engine |
| CN109209661A (en) * | 2018-10-13 | 2019-01-15 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine plateau power compensating for loss and damage control method |
| CN110630396A (en) * | 2019-09-30 | 2019-12-31 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN110671218A (en) * | 2019-09-30 | 2020-01-10 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN110671219A (en) * | 2019-12-05 | 2020-01-10 | 潍柴动力股份有限公司 | Method and system for controlling air-fuel ratio of gas engine |
| CN112081677A (en) * | 2020-08-28 | 2020-12-15 | 奇瑞汽车股份有限公司 | Air-fuel ratio control method and device |
| CN112594073A (en) * | 2020-12-15 | 2021-04-02 | 潍柴动力股份有限公司 | Control method of air-fuel ratio of engine and engine |
| CN112664319A (en) * | 2020-12-25 | 2021-04-16 | 航天时代飞鸿技术有限公司 | Control system and fault diagnosis method for aviation piston two-stroke supercharged engine |
| CN113202652A (en) * | 2021-06-18 | 2021-08-03 | 潍柴动力股份有限公司 | Gas engine gas injection correction method and gas engine |
Non-Patent Citations (3)
| Title |
|---|
| 严浩铭;孙仁云;陈德刚;汪科任;: "点燃式发动机瞬态空燃比自适应控制策略研究", 中国测试, no. 3, 31 March 2016 (2016-03-31), pages 119 - 122 * |
| 周重光, 严兆大, 王希珍, 苏石川, 曹韵华: "空燃比对LPG发动机排放特性影响的研究", 内燃机工程, no. 05, 15 October 2002 (2002-10-15), pages 26 - 29 * |
| 张腾;韩文涛;田占勇;王林波;安宁;姚旺;: "天然气发动机EGR***应用研究", 内燃机与动力装置, no. 04, 15 August 2020 (2020-08-15), pages 84 - 89 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202253A1 (en) * | 2022-04-19 | 2023-10-26 | 潍柴动力股份有限公司 | Air-fuel ratio calibration method and calibration system of high-power gas engine |
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| WO2023202253A1 (en) | 2023-10-26 |
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