CN107120200B - Gas pressure-tail gas oxygen content double closed-loop air inlet control system and control method - Google Patents
Gas pressure-tail gas oxygen content double closed-loop air inlet control system and control method Download PDFInfo
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- CN107120200B CN107120200B CN201710496184.9A CN201710496184A CN107120200B CN 107120200 B CN107120200 B CN 107120200B CN 201710496184 A CN201710496184 A CN 201710496184A CN 107120200 B CN107120200 B CN 107120200B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
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- 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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- 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
- Y02T10/40—Engine management systems
Abstract
The invention discloses a gas pressure-tail gas oxygen content double closed-loop air inlet control system and a control method, wherein the control system comprises a gas pressure sensor, an oxygen sensor, a controller, a frequency converter and a fan; the oxygen sensor is arranged in the tail gas pipe of the unit and is used for detecting the actual excess air coefficient and transmitting the actual excess air coefficient to the controller; the controller is used for comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and further determining an air inlet pressure set value controlled by the inner ring through outer ring control; the air pressure sensor is arranged in the air inlet pipe of the unit and used for detecting the air inlet pressure of the unit and transmitting the air inlet pressure to the controller; the controller is used for comparing the received air inlet pressure of the unit with an air inlet pressure set value determined by outer ring control, further determining the working frequency of the frequency converter, and finally changing the air inlet amount of the fuel gas by carrying out frequency conversion speed regulation on the fan through the frequency converter so as to realize the air-fuel ratio control of the inner ring.
Description
Technical Field
The invention belongs to the field of environmental protection and energy, and particularly relates to a gas pressure-tail gas oxygen content double closed-loop air inlet control system and a control method
Background
In recent years, energy problems and environmental problems become more and more of the problems of the public, the good ecological environment and the existing fossil energy are more and more precious, and more energy is needed for human development, so that people begin to pay attention to renewable energy sources in order to solve the contradiction. China is a traditional agricultural large country, and has the unique advantage of developing biogas. The biomass is used for producing the biogas, so that pollution caused by biomass incineration can be reduced, fossil energy can be replaced to a certain extent, and the energy problem and the environmental problem are relieved.
The heat value of the biogas is lower than that of natural gas, and the fluctuation of the content of the combustible gas is large, so that the biogas internal combustion generating set is difficult to start, unstable in rotating speed, suddenly extinguished in high-power operation and the like, and the problems can be well solved by controlling the air-fuel ratio of the internal combustion generating set.
At present, the literature related to air-fuel ratio control is mostly aimed at gas sources with stable components such as natural gas, and the components of methane are influenced by fermentation conditions and vary from 50% to 80% due to larger fluctuation range of methane content. Therefore, the air-fuel ratio control system for methane is required to be studied because the air-fuel ratio control system for natural gas has insufficient adjustment capability and unmatched parameters in some extreme cases.
For example: patent No. 201110124798.7, entitled: the application calculates the flow required by the fuel gas in advance by feeding back signals such as the pressure of the air inlet pipe, the pressure difference of the fuel gas, the temperature of the fuel gas, the rotating speed and the like, and adjusts the flow through a control valve, but the system is basically similar to open-loop control, and the idea of using a temperature sensor which is a severely lagging detection device for advanced control is not strict enough. In addition, all air-fuel ratio control systems of the gas internal combustion generating set almost all need to be added with electric control valves to adjust air inflow before longitudinal observation, the control method can increase air inflow resistance and consume extra energy, and the gas inflow and the valve opening belong to serious nonlinear relations, so that the system adjustment range is limited, and the control difficulty is high. Therefore, the traditional air-fuel ratio control system of the gas internal combustion generating set is difficult to popularize, and many internal combustion engine manufacturers prefer to select the traditional series mechanical pressure reducing valve for manual adjustment.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a gas pressure-tail gas oxygen content double closed-loop air inlet control system which can ensure that the air-fuel ratio of a methane internal combustion engine is stabilized in a high-efficiency operation area in real time.
The air-fuel ratio refers to the ratio of the volume of air to fuel in the mixture gas entering the cylinder, and in practice, the air-fuel ratio is often replaced with the excess air ratio λ (λ is the ratio of the amount of air actually supplied at the time of combustion to the amount of air theoretically required for complete combustion), and the air-fuel ratio of the present invention actually refers to the excess air ratio λ.
The invention discloses a gas pressure-tail gas oxygen content double closed-loop air inlet control system which comprises a gas pressure sensor, an oxygen sensor, a controller, a frequency converter and a fan, wherein the gas pressure sensor is connected with the oxygen sensor;
the oxygen sensor is arranged in the tail gas pipe of the unit and is used for detecting the actual excess air coefficient and transmitting the actual excess air coefficient to the controller; the controller is used for comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and further determining an air inlet pressure set value controlled by the inner ring through outer ring control;
the air pressure sensor is arranged in the air inlet pipe of the unit and used for detecting the air inlet pressure of the unit and transmitting the air inlet pressure to the controller; the controller is used for comparing the received air inlet pressure of the unit with an air inlet pressure set value determined by outer ring control, further determining the working frequency of the frequency converter, and finally changing the air inlet amount of the fuel gas by carrying out frequency conversion speed regulation on the fan through the frequency converter so as to realize the air-fuel ratio control of the inner ring.
Further, the fan is a Roots fan with constant torque load.
Roots blower constant torque load, and its delivery gas flow rate can be considered approximately proportional to rotational speed. When the system works normally, the frequency converter works between 20Hz and 50Hz, and the frequency of the frequency converter and the rotating speed of the Roots blower are approximately in a linear relation according to the knowledge of the U/f frequency conversion speed regulation of the alternating current motor, which can be similar to the mechanical characteristics of strict constant magnetic flux control. From the above two conclusions, it can be seen that the frequency of the frequency converter and the gas flow can be approximately in a linear relationship, in other words, the conventional nonlinear system is converted into a linear system by the present invention.
Further, the inlet of the fan is also provided with a filter device.
Furthermore, a buffer tank is connected in series between the filtering equipment and the fan.
Further, the controller is further configured to:
and comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and determining an air inlet pressure set value controlled by the inner ring by using the PID control algorithm.
Further, the controller is further configured to:
after the received air inlet pressure of the unit is compared with an air inlet pressure set value determined by outer ring control, the working frequency of a frequency converter is determined by utilizing a PID control algorithm, and finally, the frequency converter is used for carrying out frequency conversion speed regulation on a fan to change the air inlet amount of fuel gas so as to realize the air-fuel ratio control of the inner ring.
The invention also provides a control method of the gas pressure-tail gas oxygen content double closed-loop air inlet control system.
The control method of the gas pressure-tail gas oxygen content double closed-loop air inlet control system comprises the following steps:
the oxygen sensor detects the actual excess air ratio and transmits the actual excess air ratio to the controller; the controller compares the received actual excess air coefficient with an air coefficient set value under the current working condition, and then the air inlet pressure set value controlled by the inner ring is determined by the outer ring control;
the air pressure sensor detects the air inlet pressure of the unit and transmits the air inlet pressure to the controller; and the controller compares the received air inlet pressure of the unit with an air inlet pressure set value determined by outer ring control, so as to determine the working frequency of the frequency converter, and finally, the frequency converter is used for carrying out frequency conversion speed regulation on the fan to change the air inlet amount of the fuel gas, thereby realizing the inner ring control of the air-fuel ratio.
Further, when the variable working condition or the sudden disturbance action is adopted, the gas sucking quantity of the unit is changed, the wind pressure of the fan fluctuates, and the inner ring is coarsely adjusted before the outer ring acts.
Further, the controller sets an air factor threshold for the excess air factor according to different conditions.
Further, the working conditions include: a start-up condition, an idle or light load condition, and a rated load condition.
Working condition one: and (5) starting working conditions. The working condition has small rotating speed and large throttle opening and input power. The condition must provide a relatively dense mixture, otherwise, difficult starting and other conditions are caused.
Working condition II: no-load or light-load conditions. The working condition has zero external output power, small throttle opening and small input power, and the lean mixture can still ensure the stable operation of the internal combustion engine.
And (3) working condition III: rated load conditions. The internal combustion engine under the working condition runs stably, the rotating speed is maintained at 1500r/min, and the opening degree of a throttle valve and the input power are moderate.
Compared with the prior art, the invention has the beneficial effects that:
(1) Because the fluctuation period of methane concentration is long and is far longer than the combustion period of an internal combustion engine, the outer ring only can obtain satisfactory regulation effect on methane concentration change of methane. When the unit runs under variable working conditions, if waiting for excessive air coefficient feedback, the required time is long, and even the unit is stopped under extreme conditions, at the moment, the requirement cannot be met by using only the outer ring, namely the excessive air coefficient feedback. When the unit runs under variable working conditions, the required gas quantity can be changed instantaneously, the gas pipeline is narrow in space, and the gas inlet pressure can be changed rapidly, so that the response speed can be increased by introducing the pressure inner ring.
(2) The inner ring has the characteristics of first adjusting, rough adjusting and fast adjusting; the outer ring has the characteristics of back adjustment, fine adjustment and slow adjustment, and thoroughly overcomes the interference influence of the auxiliary loop which is not completely overcome. The coordination of the inner ring and the outer ring achieves the effect of rapidly and accurately controlling the excess air coefficient to be maintained at a set value. The dual closed loop control system has some characteristics as follows: the double closed loop system has strong capability of overcoming disturbance entering the inner ring; the existence of the inner ring improves the response speed of the system; the double closed loop system has certain self-adaptive capacity.
(3) The invention not only focuses on improving the combustion efficiency of the internal combustion engine, but also leads the fluid resistance of the air inlet pipeline to be minimum by the novel structure, thereby saving the electric energy which is added on the fan to overcome the fluid resistance when the traditional structure is used, and having more obvious energy-saving effect when the engine is at full power.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of a gas pressure-exhaust oxygen content dual closed loop air intake control system of the present invention;
FIG. 2 is a control schematic diagram of the gas pressure-exhaust oxygen content dual closed loop air intake control system of the present invention;
FIG. 3 is a flow chart of a control method of the gas pressure-exhaust oxygen content dual closed loop air intake control system of the present invention.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The air-fuel ratio refers to the ratio of the volume of air to fuel in the mixture gas entering the cylinder, and in practice, the air-fuel ratio is often replaced with the excess air ratio λ (λ is the ratio of the amount of air actually supplied at the time of combustion to the amount of air theoretically required for complete combustion), and the air-fuel ratio of the present invention actually refers to the excess air ratio λ.
FIG. 1 is a schematic diagram of a gas pressure-exhaust oxygen content dual closed loop air intake control system of the present invention.
As shown in FIG. 1, the gas pressure-tail gas oxygen content double-closed-loop air inlet control system comprises a gas pressure sensor, an oxygen sensor, a controller, a frequency converter and a fan;
the oxygen sensor is arranged in the tail gas pipe of the unit and is used for detecting the actual excess air coefficient and transmitting the actual excess air coefficient to the controller; the controller is used for comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and further determining an air inlet pressure set value controlled by the inner ring through outer ring control;
the air pressure sensor is arranged in the air inlet pipe of the unit and used for detecting the air inlet pressure of the unit and transmitting the air inlet pressure to the controller; the controller is used for comparing the received air inlet pressure of the unit with an air inlet pressure set value determined by outer ring control, further determining the working frequency of the frequency converter, and finally changing the air inlet amount of the fuel gas by carrying out frequency conversion speed regulation on the fan through the frequency converter so as to realize the air-fuel ratio control of the inner ring.
The traditional air-fuel ratio control system often needs to be added with an electric control valve branch or change the opening degree of an air inlet pipeline valve to control the air-fuel ratio, so that the air inlet resistance is increased, energy waste is caused, and the control difficulty of the traditional air-fuel ratio control system is high because the gas flow and the valve opening degree are in a strong nonlinear relation under the condition of constant pressure difference. The methane content of the biogas in the actual system has a larger range, and the controller parameters are not suitable for the actual system, so that a relatively complex control algorithm is required.
Unlike most internal combustion generating set air-fuel ratio control systems, the execution element of the invention is a Roots blower on an air inlet pipeline, the Roots blower belongs to constant torque load, the flow of conveying gas can be approximately considered to be in direct proportion to the rotating speed, and the blower is a Roots blower with constant torque load.
When the system works normally, the frequency converter works between 20Hz and 50Hz, and the frequency of the frequency converter and the rotating speed of the Roots blower are approximately in a linear relation according to the knowledge of the U/f frequency conversion speed regulation of the alternating current motor, which can be similar to the mechanical characteristics of strict constant magnetic flux control. From the above two conclusions, it can be seen that the frequency of the frequency converter and the gas flow can be approximately in a linear relationship, in other words, the conventional nonlinear system is converted into a linear system by the present invention.
Wherein, filter equipment is still installed to the entry of fan.
A buffer tank is also connected in series between the filter equipment and the fan.
As shown in fig. 2, the controller of the present invention is further configured to:
and comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and determining an air inlet pressure set value controlled by the inner ring by using the PID control algorithm.
The controller of the present invention is also for:
after the received air inlet pressure of the unit is compared with an air inlet pressure set value determined by outer ring control, the working frequency of a frequency converter is determined by utilizing a PID control algorithm, and finally, the frequency converter is used for carrying out frequency conversion speed regulation on a fan to change the air inlet amount of fuel gas so as to realize the air-fuel ratio control of the inner ring.
Aiming at the defect that the hardware structure of the traditional air-fuel ratio control system is irreversible in software, the invention creatively improves and simplifies the hardware structure of the system, overturns the traditional thought of changing the air inlet resistance to control the flow, saves the electric energy which is originally used for overcoming the air resistance, changes the nonlinearity into linearity and realizes the direct control of the air inlet flow.
Aiming at a brand new hardware structure, the invention provides a double closed-loop control method for excess air coefficient and methane air inlet pressure.
As shown in fig. 3, the control method of the gas pressure-exhaust gas oxygen content double closed-loop air intake control system of the invention comprises the following steps:
the oxygen sensor detects the actual excess air ratio and transmits the actual excess air ratio to the controller; the controller compares the received actual excess air coefficient with an air coefficient set value under the current working condition, and then the air inlet pressure set value controlled by the inner ring is determined by the outer ring control;
the air pressure sensor detects the air inlet pressure of the unit and transmits the air inlet pressure to the controller; and the controller compares the received air inlet pressure of the unit with an air inlet pressure set value determined by outer ring control, so as to determine the working frequency of the frequency converter, and finally, the frequency converter is used for carrying out frequency conversion speed regulation on the fan to change the air inlet amount of the fuel gas, thereby realizing the inner ring control of the air-fuel ratio.
When the working condition is changed or sudden disturbance acts, the gas sucking quantity of the unit is changed, the wind pressure of the fan fluctuates, and the inner ring is coarsely adjusted before the outer ring acts. The inner loop is roughly estimated to be about 10 times faster than the outer loop response. After a period of delay, the wide-area oxygen sensor detects the change of the excessive air coefficient, the outer ring responds according to feedback, the set value of the pressure inner ring is changed, the controller compares the feedback value with the set value, and double closed-loop control is started until the excessive air coefficient is restored to the set value.
The controller sets an air factor threshold for the excess air factor according to different operating conditions.
The working conditions comprise: a start-up condition, an idle or light load condition, and a rated load condition.
Working condition one: and (5) starting working conditions. The rotating speed under the working condition is smaller,throttle opening and input power are large. The condition must provide a relatively dense mixture, otherwise, difficult starting and other conditions are caused. The excess air coefficient lambda is set to lambda 1 。
Working condition II: no-load or light-load conditions. The working condition has zero external output power, small throttle opening and small input power, and the lean mixture can still ensure the stable operation of the internal combustion engine. The excess air coefficient lambda is set to lambda 2 。
And (3) working condition III: rated load conditions. The internal combustion engine under the working condition runs stably, the rotating speed is maintained at 1500r/min, and the opening degree of a throttle valve and the input power are moderate. An empirical value may be used at this time, with the excess air coefficient lambda set to lambda 3 。
Because the overvoltage and overcurrent of the generator set after exceeding rated power endanger the safety of the generator set, overload or heavy-load operation is forbidden, and three working conditions and operation characteristics of the internal combustion engine set are shown in table 1.
Table 1: six working conditions of internal combustion engine set
| Working conditions of | Rotating speed (r/min) | Throttle opening | Input power | Air excess factor |
| Start-up | 0～1500 | Larger size | Larger size | λ 1 |
| Light or no load | 1500 | Smaller size | Smaller size | λ 2 |
| Rated load | 1500 | Moderate to moderate | Moderate to moderate | λ 3 |
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The gas pressure-tail gas oxygen content double closed-loop air inlet control system is characterized by comprising a gas pressure sensor, an oxygen sensor, a controller, a frequency converter and a fan;
the oxygen sensor is arranged in the tail gas pipe of the methane internal combustion generating set and is used for detecting the actual excess air coefficient and transmitting the actual excess air coefficient to the controller; the controller is used for comparing the received actual excess air coefficient with an air coefficient set value under the current working condition, and determining an air inlet pressure set value controlled by the inner ring by using a PID control algorithm after comparing the actual excess air coefficient with the air coefficient set value controlled by the current working condition;
the air pressure sensor is arranged in the unit air inlet pipe and is used for detecting the air inlet pressure of the methane internal combustion generating unit and transmitting the air inlet pressure to the controller; the controller is used for comparing the received air inlet pressure of the methane internal combustion generating set with an air inlet pressure set value determined by outer ring control, determining the working frequency of the frequency converter by utilizing a PID control algorithm, and finally changing the air inlet amount of the fuel gas by carrying out frequency conversion speed regulation on the fan by the frequency converter so as to realize the inner ring control of the air-fuel ratio.
2. The gas pressure-exhaust oxygen content dual closed loop intake control system of claim 1, wherein the fan is a constant torque load Roots fan.
3. The gas pressure-exhaust oxygen content dual closed loop intake control system of claim 1, wherein the inlet of the blower is further equipped with a filter device.
4. A gas pressure-exhaust gas oxygen content dual closed loop intake control system as claimed in claim 3, wherein a buffer tank is further connected in series between said filter device and said fan.
5. A control method of the gas pressure-exhaust gas oxygen content dual closed-loop intake control system according to any one of claims 1 to 4, comprising:
the oxygen sensor detects the actual excess air ratio and transmits the actual excess air ratio to the controller; the controller compares the received actual excess air coefficient with an air coefficient set value under the current working condition, and then the air inlet pressure set value controlled by the inner ring is determined by the outer ring control;
the air pressure sensor detects the air inlet pressure of the methane internal combustion generator set and transmits the air inlet pressure to the controller; and the controller compares the received air inlet pressure of the biogas internal combustion generating set with an air inlet pressure set value determined by outer ring control, so as to determine the working frequency of the frequency converter, and finally, the frequency converter is used for carrying out frequency conversion speed regulation on the fan to change the air inlet amount of the fuel gas, thereby realizing the inner ring control of the air-fuel ratio.
6. The control method of the gas pressure-tail gas oxygen content double closed-loop air intake control system according to claim 5, wherein when the variable working condition or the sudden disturbance action is used, the gas sucking quantity of the methane internal combustion generating set is changed, the wind pressure of the fan fluctuates, and the inner ring is coarsely regulated before the outer ring acts.
7. The method of claim 5, wherein the controller sets the air factor threshold for excess air factor based on different operating conditions.
8. The method for controlling a gas pressure-exhaust oxygen content dual closed loop intake control system of claim 7, wherein the operating conditions include: a start-up condition, an idle or light load condition, and a rated load condition.
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| CN111322153A (en) * | 2019-12-30 | 2020-06-23 | 上海沼鑫环保新能源科技有限公司 | Method and system for generating power by utilizing methane |
| CN113294266B (en) * | 2020-02-21 | 2022-07-05 | 中国石油天然气股份有限公司 | Air-fuel ratio regulating and controlling device and method for compressor |
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| JPH0612087B2 (en) * | 1987-12-14 | 1994-02-16 | 日本電子機器株式会社 | Electronically controlled fuel injection device for internal combustion engine |
| US5781875A (en) * | 1995-02-25 | 1998-07-14 | Honda Giken Kogyo Kabushiki Kaisha | Fuel metering control system for internal combustion engine |
| US6119670A (en) * | 1997-08-29 | 2000-09-19 | Autotronic Controls Corporation | Fuel control system and method for an internal combustion engine |
| CN1670351A (en) * | 2004-03-17 | 2005-09-21 | 吴雄良 | Ultralow discharging electric control device of electric jetting motor and its controlling method |
| DE102006020522A1 (en) * | 2006-05-03 | 2007-11-08 | Robert Bosch Gmbh | Method for operating an IC engine with pressure pulse supercharger to drive air into engine in relation to actual engine parameters |
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| JP6497048B2 (en) * | 2014-12-03 | 2019-04-10 | スズキ株式会社 | Air-fuel ratio learning control device for internal combustion engine |
| CN105257415B (en) * | 2015-11-05 | 2017-12-19 | 山东大学 | A kind of small-sized biomass gas internal combustion engine generator set control system and control method |
| CN105298664B (en) * | 2015-11-20 | 2017-12-19 | 山东大学 | A kind of biogas internal combustion engine generator group auxiliary fuel supply-system and its control method |
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