CN210343515U - Engine fuel control system for unsteady component gas source - Google Patents
Engine fuel control system for unsteady component gas source Download PDFInfo
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- CN210343515U CN210343515U CN201921321569.2U CN201921321569U CN210343515U CN 210343515 U CN210343515 U CN 210343515U CN 201921321569 U CN201921321569 U CN 201921321569U CN 210343515 U CN210343515 U CN 210343515U
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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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model discloses an engine fuel control system aiming at an unstable component gas source, which comprises a proportional mixer, an engine electric control unit, a crankshaft speed sensor, an electronic throttle valve, an air inlet temperature and pressure sensor and an oxygen sensor; and a gas bypass pipeline containing a gas temperature and pressure sensor and a gas bypass valve is arranged between the gas inlet end and the mixed gas outlet end of the proportional mixer. Based on the difference value between the actual air-fuel ratio and the initial air-fuel ratio under the current working condition, the opening of a gas bypass valve is adjusted through PID control to carry out air-fuel ratio closed-loop control; meanwhile, the opening degree is corrected according to the gas temperature and pressure signal; the adjustment of the opening degree is stopped until the actual air-fuel ratio becomes approximately equal to the initial air-fuel ratio. The utility model discloses can do the adaptive control of pertinence according to unsteady composition air supply, guarantee engine normal operating and power stable output.
Description
Technical Field
The utility model belongs to the technical field of engine fuel control, especially, relate to an engine fuel control system to unsteady composition air supply.
Background
The natural gas mainly comprises CH4 and is a high-quality clean fuel, and the extracted natural gas is mainly stored and utilized in the form of CNG and LNG through refining and purification, and is partially widely applied to gas engine products. However, in the industrial field, there are many special gas sources, the main component of which is CH4 and contains other gas impurities, such as petroleum associated gas, landfill gas, biogas and the like. The characteristics of the gas source are that the gas components are unstable, the difference of various regions is large, and the gas components change along with the change of the environmental temperature, the environmental temperature is high under the normal condition, the CH4 concentration in the gas source is high, the environmental temperature is low, and the CH4 concentration is reduced. The engine uses the stable air supply of gas composition, can control the air-fuel ratio of gas more easily, and power output is also comparatively stable. If an unstable component gas source (gas source with variable gas components) is used, the conventional combustion control system is difficult to perform effective air-fuel ratio control, so that the starting of an engine is difficult and the power is unstable; frequent adjustments to the engine data or the mixer are therefore required. The adjustment of the data or the mixer needs to be carried out under the condition that the engine is in a stop state, the actual use of a client is influenced by the adjustment process, the production stop of the client is caused due to power failure in some cases, and economic loss is often brought to the client.
SUMMERY OF THE UTILITY MODEL
Aim at overcoming exist not enoughly among the above-mentioned prior art, the utility model provides a technical problem is, has provided an engine fuel control system to unsteady composition air supply, can do the adaptive control of pertinence according to the air supply that the customer is different, guarantees the normal operating of engine to and the stable output of power.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: an engine fuel control system aiming at an unstable component gas source comprises a proportional mixer, an engine electronic control unit, a crankshaft rotating speed sensor for monitoring the rotating speed of an engine, an electronic throttle valve for controlling the flow of a mixed gas entering an air inlet pipe, an air inlet temperature and pressure sensor for monitoring the temperature and pressure of the mixed gas in the air inlet pipe and an oxygen sensor for monitoring the oxygen concentration in an exhaust pipe; the crankshaft rotating speed sensor, the electronic throttle valve, the intake air temperature and pressure sensor and the oxygen sensor are all electrically connected with the engine electronic control unit;
a gas bypass pipeline is arranged between a gas inlet end and a mixed gas outlet end of the proportional mixer, and a gas temperature pressure sensor for monitoring the temperature and pressure of gas and a gas bypass valve for controlling the flow of the gas entering the gas bypass pipeline are arranged on the gas bypass pipeline.
Further, the gas temperature pressure sensor is located on the gas bypass line upstream of the gas bypass valve.
Further, the intake air temperature pressure sensor is provided on the intake pipe downstream of the electronic throttle valve.
Further, the oxygen sensor is disposed on the exhaust pipe downstream of the turbine outlet end.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
the utility model discloses an engine fuel control system to unsteady composition air supply, including proportional mixer, engine electrical control unit, the bent axle speed sensor who is connected with engine electrical control unit electricity, electronic air throttle, inlet air temperature pressure sensor and oxygen sensor; a gas bypass pipeline is arranged between the gas inlet end and the mixed gas outlet end of the proportional mixer, and a gas temperature pressure sensor and a gas bypass valve are arranged on the gas bypass pipeline. The engine electronic control unit adjusts the opening degree of a gas bypass valve through PID control to perform air-fuel ratio closed-loop control based on the difference value between the actual air-fuel ratio lambda 1 and the calibrated initial air-fuel ratio lambda 2 under the current working condition; meanwhile, the opening degree of the current gas bypass valve is corrected according to a gas temperature pressure signal transmitted by a gas temperature pressure sensor; and stopping adjusting the opening of the gas bypass valve until the difference value between the actual air-fuel ratio lambda 1 and the calibrated initial air-fuel ratio lambda 2 is within a preset deviation range.
The utility model discloses an above-mentioned control system, the corresponding control method of matching can be according to the different air supplies of customer do the pertinence adaptive control, can carry out effective control to the air-fuel ratio according to the aperture of gas composition accurate control gas bypass valve, guarantees the normal operating of engine and the stable output of power. The adjustment of data or a mixer is not needed when the engine is in a stop state due to the instability of gas components, so that the production stop of a user due to power failure is avoided, and the economic benefit of the user is ensured.
Drawings
FIG. 1 is a plan view of an engine fuel control system of the present invention for an unsteady component gas source;
FIG. 2 is a control schematic of the engine fuel control system of the present invention for an unsteady component gas source;
FIG. 3 is a flow chart of a method of engine fuel control for an unsteady component gas source;
FIG. 4 is a flowchart of an initial calibration step performed on the initial air-fuel ratio λ 2 in FIG. 3;
FIG. 5 is a flowchart illustrating the steps of FIG. 3 for correcting the opening of the gas bypass valve based on the gas temperature and pressure signal transmitted by the gas temperature and pressure sensor;
in the figure: 1-a proportional mixer, 2-an engine electronic control unit, 3-a crankshaft speed sensor, 4-an electronic throttle valve, 5-an air inlet temperature and pressure sensor, 6-an oxygen sensor, 7-a gas bypass pipeline, 8-a gas temperature and pressure sensor, 9-a gas bypass valve, 10-gas, 11-an air inlet pipe, 12-an air outlet pipe and 13-a turbine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for simplicity of description only and are not intended to limit the invention.
As shown in fig. 1 and fig. 2 together, the engine fuel control system for the unsteady component gas source comprises a proportional mixer 1, an engine electronic control unit 2, a crankshaft rotation speed sensor 3 for monitoring the rotation speed of the engine, an electronic throttle 4 for controlling the flow of the mixture entering an intake pipe 11, an intake air temperature and pressure sensor 5 for monitoring the temperature and pressure of the mixture in the intake pipe 11, and an oxygen sensor 6 for monitoring 5 the oxygen concentration in an exhaust pipe 12; the crankshaft rotation speed sensor 3, the electronic throttle 4, the intake air temperature and pressure sensor 5 and the oxygen sensor 6 are all electrically connected with the engine electronic control unit 2; besides, a gas bypass pipeline 7 is arranged between the gas inlet end and the mixed gas outlet end of the proportional mixer 1, and a gas temperature pressure sensor 8 for monitoring the gas temperature and pressure and a gas bypass valve 9 for controlling the gas flow entering the gas bypass pipeline 7 are arranged on the gas bypass pipeline 7. The components of the fuel gas 10 entering the proportional mixer 1 are unstable and belong to unstable component gas sources.
In the present embodiment, the intake air temperature and pressure sensor 5 is provided on the intake pipe 11 downstream of the electronic throttle valve 4, and the oxygen sensor 6 is provided on the exhaust pipe 12 downstream of the outlet end of the turbine 13; the gas temperature and pressure sensor 8 is positioned at the upstream of the gas bypass pipeline 7; the accuracy of the monitoring data is ensured by reasonably arranging the sensors.
The embodiment also discloses a control method of the engine fuel control system based on the unstable ingredient air source. As shown in fig. 1 and fig. 3 to 5, the core steps of the control method include:
s1, initializing and calibrating the engine, pre-storing gas components (the gas components comprise average heat value gas components, maximum heat value gas components and minimum heat value gas components), a reference air-fuel ratio lambda 0 (lambda 0 actually represents an MAP chart for inquiring the air-fuel ratio) under different working conditions and a gas bypass valve basic opening k0(k0 actually represents the MAP chart for inquiring the gas bypass valve basic opening) under different working conditions in the engine electronic control unit 2; and carrying out initialization calibration on the initial air-fuel ratio lambda 2 under different working conditions.
It should be noted that the prestored reference air-fuel ratio λ 0 under different working conditions and the prestored basic opening k0 of the gas bypass valve under different working conditions are tentative according to empirical values and are not completely correct, so that initialization calibration is required; i.e. recalibrated on the basis of empirical values.
S2, the engine runs normally, and the engine electronic control unit 2 controls the engine to run normally through the electronic throttle 4, the crankshaft speed sensor 3, the oxygen sensor 6 and the intake pressure temperature sensor 5; and acquiring the opening of an electronic throttle valve, the rotating speed of an engine, the oxygen concentration and the air inlet temperature and pressure data, and analyzing and processing the acquired data to obtain the actual air-fuel ratio lambda 1 under the current working condition.
S3, the engine electronic control unit 2 adjusts the opening degree of the gas bypass valve 9 through PID control to perform air-fuel ratio closed-loop control based on the difference value between the actual air-fuel ratio lambda 1 under the current working condition and the calibrated initial air-fuel ratio lambda 2; meanwhile, the current opening degree of the gas bypass valve 9 is corrected according to a gas temperature pressure signal transmitted by the gas temperature pressure sensor 8.
That is, the principle of PID control is: if the calibrated initial air-fuel ratio lambda 2 is greater than the actual air-fuel ratio lambda 1 under the current working condition, it is indicated that the concentration of CH4 in the fuel gas 10 is increased, the engine electronic control unit 2 controls and adjusts the opening of the fuel gas bypass valve 9 to decrease, so that the amount of fuel gas entering the engine is decreased, and meanwhile, the size of the opening can be corrected according to the temperature pressure (the components of the fuel gas 10 are increased by the influence of the temperature pressure, so that the correction is needed); if the calibrated initial air-fuel ratio lambda 2 is smaller than the actual air-fuel ratio lambda 1 under the current working condition, which indicates that the concentration of CH4 in the fuel gas 10 becomes smaller, the engine electronic control unit 2 controls and adjusts the opening of the fuel gas bypass valve 9 to increase the amount of fuel gas entering the engine, and the opening is corrected according to the temperature and the pressure. PID control is a technique commonly used by those skilled in the art and will not be described in detail herein.
And S4, stopping adjusting the opening of the gas bypass valve 9 until the difference value between the actual air-fuel ratio lambda 1 and the calibrated initial air-fuel ratio lambda 2 is within a preset deviation range.
In this embodiment, the step of performing initial calibration on the initial air-fuel ratio λ 2 specifically includes:
s11, initially running the engine, and closing the air-fuel ratio closed-loop regulation function; at the moment, the oxygen sensor 6 is not required to provide a feedback signal for the engine electronic control unit 2, and is only used for monitoring the oxygen concentration, namely the actual air-fuel ratio; the engine electronic control unit 2 acquires the data of the opening of the electronic throttle valve, the rotating speed of the engine, the oxygen concentration and the pressure of the air inlet temperature through the electronic throttle valve 4, the crankshaft rotating speed sensor 3, the oxygen sensor 6 and the air inlet pressure and temperature sensor 5, and analyzes and processes the acquired data to obtain the actual air-fuel ratio lambda 1 under the current working condition; at this time, calibration is not started, namely calibration is not performed temporarily under the operation of the idle condition and the partial load condition of the engine.
S12, when the air-fuel ratio is in a rated working condition, the actual air-fuel ratio lambda 1 is pre-adjusted by manually adjusting the opening degree of the proportional mixer 1 (lambda 0-c is not less than lambda 1 and not more than lambda 0+ c, and c is a fixed value; and then, under different working conditions, according to the difference between the actual air-fuel ratio lambda 1 and the reference air-fuel ratio lambda 0, manually (manually means that a basic opening value is set in the engine electronic control unit 2 again, and the original basic opening k0 is replaced) initializing and calibrating the basic opening k0 of the gas bypass valve to obtain an initial basic opening k1 of the gas bypass valve (k1 actually represents a MAP chart for inquiring the basic opening of the gas bypass valve after the initial calibration) until the difference between the actual air-fuel ratio lambda 1 and the corresponding reference air-fuel ratio lambda 0 under different working conditions is within a preset deviation range.
S13, in the process of initializing and calibrating the basic opening k1 of the initial gas bypass valve, initializing and calibrating the reference air-fuel ratio lambda 0 manually (manually means that the air-fuel ratio is set in the engine electronic control unit 2 again and the original reference air-fuel ratio lambda 0 is replaced) according to the actual running condition of the engine to obtain an initial air-fuel ratio lambda 2; and after calibration is finished, starting an air-fuel ratio closed-loop adjusting function and verifying calibration data.
In the actual operation of the engine, no matter how the opening degree of the gas bypass valve 9 is calibrated and adjusted, the difference value between the reference air-fuel ratio lambda 0 and the actual air-fuel ratio lambda 1 still cannot be within the preset deviation range or the engine cannot normally work (the engine has unstable rotating speed and power fluctuation); in this case, it is explained that the reference air-fuel ratio λ 0 set by the empirical value is not appropriate, and therefore, it is necessary to recalibrate it.
And S14, storing the newly calibrated initial basic opening k1 of the gas bypass valve under different working conditions and the initial air-fuel ratio lambda 2 under different working conditions. The engine is convenient to search and call after the engine normally runs.
In short, the process of initializing the calibration is modified and perfected on the basis of the empirical preset value. Making the control of its subsequent air-fuel ratio more accurate.
In this embodiment, in step S3, the step of correcting the opening degree of the gas bypass valve 9 based on the gas temperature pressure signal transmitted from the gas temperature pressure sensor 8 specifically includes:
s30, a temperature correction constant α and a pressure correction constant β are preset in the engine ecu 2.
S31, the engine electric control unit 2 adjusts a fuel gas temperature coefficient Ft based on the difference value between the real-time collected fuel gas temperature actual value Ta (real-time monitoring of the fuel gas temperature pressure sensor 8) and the fuel gas temperature preset value Td, wherein the fuel gas temperature coefficient Ft is (Ta-Td) multiplied by α, namely, when Ta is larger than Td, Ft is increased, and when Ta is smaller than Td, Ft is decreased.
S310, when the actual value Ta of the gas temperature is greater than or equal to a preset maximum temperature limit Tmax, triggering a gas temperature high alarm; and when the actual gas temperature value Ta is less than or equal to the preset minimum temperature limit value Tmin, triggering gas temperature low alarm.
S32, the engine electronic control unit 2 adjusts a gas pressure coefficient Fp based on the difference value between the real-time collected gas pressure actual value Pa (real-time monitoring of the gas temperature and pressure sensor 8) and the preset gas pressure value Pd, wherein the gas pressure coefficient Fp is (Pd-Pa) multiplied by β, namely, when Pa is larger than Pd, Fp is reduced, and when Pa is smaller than Pd, Fp is increased.
S320, when the actual gas pressure Pa is greater than or equal to a preset maximum pressure limit value Pmax, triggering high gas pressure to alarm; and when the actual gas pressure Pa is less than or equal to the preset lowest pressure Pmin, triggering the gas pressure low alarm.
S33, the corrected opening degree of the gas bypass valve is equal to the current opening degree of the gas bypass valve x (1+ Ft + Fp); the current opening degree of the gas bypass valve in the formula is the opening degree after the air-fuel ratio closed-loop control.
The utility model discloses an above-mentioned control system, the adaptive control of pertinence can be done according to the air supply that the customer is different to match above-mentioned control method, can carry out effective control to the air-fuel ratio according to the aperture of gas composition accurate control gas bypass valve, guarantees the normal operating of engine and the stable output of power. The adjustment of data or a mixer is not needed when the engine is in a stop state due to the instability of gas components, so that the production stop of a user due to power failure is avoided, and the economic benefit of the user is ensured.
The above description is a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The engine fuel control system for the unstable component gas source comprises a proportional mixer, an engine electric control unit, a crankshaft rotating speed sensor for monitoring the rotating speed of an engine, an electronic throttle valve for controlling the flow of a mixed gas entering an air inlet pipe, an air inlet temperature and pressure sensor for monitoring the temperature and pressure of the mixed gas in the air inlet pipe and an oxygen sensor for monitoring the oxygen concentration in an exhaust pipe; the crankshaft rotating speed sensor, the electronic throttle valve, the intake air temperature and pressure sensor and the oxygen sensor are all electrically connected with the engine electronic control unit; it is characterized in that the preparation method is characterized in that,
a gas bypass pipeline is arranged between a gas inlet end and a mixed gas outlet end of the proportional mixer, and a gas temperature pressure sensor for monitoring the temperature and pressure of gas and a gas bypass valve for controlling the flow of the gas entering the gas bypass pipeline are arranged on the gas bypass pipeline.
2. The engine fuel control system for an unsteady component air supply of claim 1, wherein the gas temperature pressure sensor is located on the gas bypass line upstream of the gas bypass valve.
3. The engine fuel control system for an unsteady component air supply according to claim 1, characterized in that the intake air temperature pressure sensor is provided on the intake pipe downstream of the electronic throttle valve.
4. An engine fuel control system for a non-stabilized component air supply as recited in claim 1, wherein said oxygen sensor is disposed on said exhaust pipe downstream of a turbine outlet end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921321569.2U CN210343515U (en) | 2019-08-14 | 2019-08-14 | Engine fuel control system for unsteady component gas source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921321569.2U CN210343515U (en) | 2019-08-14 | 2019-08-14 | Engine fuel control system for unsteady component gas source |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410225A (en) * | 2019-08-14 | 2019-11-05 | 潍柴西港新能源动力有限公司 | For the engine fuel control system and control method of unstable ingredient gas source |
| CN112253321A (en) * | 2020-10-13 | 2021-01-22 | 东风汽车集团有限公司 | Single-cylinder air-fuel ratio closed-loop control method of multi-cylinder engine based on oxygen sensor |
| CN112523882A (en) * | 2020-11-09 | 2021-03-19 | 广西玉柴机器股份有限公司 | Fuel control device and fuel control method of gas engine air inlet pressure closed loop |
| CN114251180A (en) * | 2021-12-22 | 2022-03-29 | 重庆康明斯发动机有限公司 | Method, device and equipment for starting control of gas engine and storage medium |
-
2019
- 2019-08-14 CN CN201921321569.2U patent/CN210343515U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410225A (en) * | 2019-08-14 | 2019-11-05 | 潍柴西港新能源动力有限公司 | For the engine fuel control system and control method of unstable ingredient gas source |
| CN112253321A (en) * | 2020-10-13 | 2021-01-22 | 东风汽车集团有限公司 | Single-cylinder air-fuel ratio closed-loop control method of multi-cylinder engine based on oxygen sensor |
| CN112523882A (en) * | 2020-11-09 | 2021-03-19 | 广西玉柴机器股份有限公司 | Fuel control device and fuel control method of gas engine air inlet pressure closed loop |
| CN112523882B (en) * | 2020-11-09 | 2023-04-28 | 广西玉柴船电动力有限公司 | Fuel control method for gas engine air inlet pressure closed loop |
| CN114251180A (en) * | 2021-12-22 | 2022-03-29 | 重庆康明斯发动机有限公司 | Method, device and equipment for starting control of gas engine and storage medium |
| CN114251180B (en) * | 2021-12-22 | 2024-05-28 | 重庆康明斯发动机有限公司 | Method, device, equipment and storage medium for gas engine starting control |
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