CN114033568B - Natural gas engine mixer monitoring method - Google Patents
Natural gas engine mixer monitoring method Download PDFInfo
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- CN114033568B CN114033568B CN202111439684.1A CN202111439684A CN114033568B CN 114033568 B CN114033568 B CN 114033568B CN 202111439684 A CN202111439684 A CN 202111439684A CN 114033568 B CN114033568 B CN 114033568B
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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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 relates to the field of vehicles and discloses a natural gas engine mixer monitoring method. In a vehicle equipped with a mixer, the actual pressure difference between the actual pressure in the intake manifold and the actual pressure at the throttle outlet differs greatly from the target difference representing the throttle loss between the intake manifold and the throttle outlet under normal conditions, whereas if the mixer is removed, the actual pressure difference between the actual pressure in the intake manifold and the actual pressure at the throttle outlet differs little from the target difference. According to the working characteristics of the mixer, the invention utilizes throttling loss to compare the actual pressure difference between the actual pressure in the air inlet manifold and the actual pressure at the outlet of the throttle valve with the target difference, confirms that the mixer is dismantled when the actual pressure difference is smaller than the target difference, and forcibly limits the torsion of the natural gas engine so as to prevent the aging of the catalyst which accelerates the aftertreatment due to the rise of the exhaust temperature of the natural gas engine after the mixer is dismantled.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a natural gas engine mixer monitoring method.
Background
In areas where the ambient temperature is low, vehicles using natural gas engines often suffer from mixer icing problems, which can result in the vehicle not being started properly. In order to solve the above technical problems, some users may privately detach the mixer without knowing the function of the mixer. Although the problem of icing of the mixer can be solved by the operation, the problems of poor combustion effect, increased gas consumption, accelerated aging of the catalyst and the like are caused by uneven mixing of air, natural gas and EGR waste gas.
Disclosure of Invention
The invention aims to provide a natural gas engine mixer monitoring method which can confirm whether a mixer of a natural gas engine is disassembled privately and forcedly limit torsion of the natural gas engine when the mixer is disassembled privately so as to prevent an after-treatment catalyst from aging accelerated due to the disassembly of the mixer and ensure the combustion effect.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a natural gas engine mixer monitoring method, which comprises the following steps:
acquiring the actual rotation speed of the natural gas engine, and acquiring the actual pressure in the air inlet manifold and the actual pressure at the outlet of the throttle valve when the actual rotation speed of the natural gas engine is greater than a preset rotation speed;
calculating an actual pressure difference between an actual pressure within the intake manifold and an actual pressure at the throttle outlet;
and comparing the actual pressure difference with a target difference, and if the actual pressure difference is smaller than the target difference, confirming that the mixer is dismantled and forcedly limiting the torsion of the natural gas engine.
As an alternative technical scheme of the natural gas engine mixer monitoring method, when the actual opening of the throttle valve is maximum, acquiring the actual pressure of the inlet of the throttle valve;
the actual pressure at the throttle inlet is taken as the actual pressure at the throttle outlet.
As an alternative to the above method for monitoring a natural gas engine mixer, the target difference value is obtained according to the following steps:
acquiring the actual rotating speed of a natural gas engine and the actual air flow entering an air inlet mixer through a throttle valve;
the pressure difference corresponding to the actual rotational speed of the natural gas engine and the actual air flow rate into the intake mixer through the throttle valve is set as a target difference value based on a map between the pressure difference between the pressure in the intake manifold and the pressure at the throttle valve outlet, the rotational speed of the natural gas engine, and the air flow rate into the intake mixer through the throttle valve.
As an alternative technical solution of the above method for monitoring a natural gas engine mixer, when it is determined that the actual pressure difference is smaller than the target difference, if the duration time of the actual pressure difference smaller than the target difference is longer than a preset duration time, it is determined that the mixer is removed.
As an alternative to the above method for monitoring a natural gas engine mixer, the actual exhaust temperature of the natural gas engine is obtained after confirming that the mixer is removed and before forcing the natural gas engine to be limited in torsion;
when the actual exhaust temperature of the natural gas engine is greater than the target temperature, the natural gas engine is forced to be limited.
As an alternative to the above method for monitoring a natural gas engine mixer, the target temperature is obtained according to the following steps:
acquiring the actual rotating speed of a natural gas engine and the actual air flow entering an air inlet mixer through a throttle valve;
the natural gas engine exhaust temperature corresponding to the actual rotational speed of the natural gas engine and the actual air flow rate into the intake mixer through the throttle valve is taken as the target temperature based on a map between the natural gas engine exhaust temperature, the rotational speed of the natural gas engine, and the air flow rate into the intake mixer through the throttle valve.
As an alternative technical scheme of the above-mentioned natural gas engine mixer monitoring method, before the natural gas engine is forced to be limited in torsion, judging whether the duration of the actual exhaust temperature of the natural gas engine being greater than the target temperature reaches the target duration;
and when the duration that the actual exhaust temperature of the natural gas engine is greater than the target temperature reaches the target duration, the natural gas engine is forced to be limited.
As an alternative to the above method for monitoring a natural gas engine mixer, the target time length is obtained according to the following steps:
and taking the duration corresponding to the actual exhaust temperature of the natural gas engine as the target duration based on the mapping relation between the duration that the exhaust temperature of the natural gas engine is greater than the target temperature and the exhaust temperature of the natural gas engine.
As an optional technical solution of the above method for monitoring a natural gas engine mixer, the forcing the natural gas engine to be limited in torsion includes:
acquiring the actual exhaust temperature of the natural gas engine and the actual torque of the natural gas engine;
based on the mapping relation between the exhaust temperature of the natural gas engine and the torque limiting coefficient, obtaining the torque limiting coefficient corresponding to the actual exhaust temperature of the natural gas engine;
the torque of the natural gas engine is forcibly limited to a target torque, which is=the actual torque of the natural gas engine×the torque limiting coefficient.
As an alternative technical scheme of the natural gas engine mixer monitoring method, acquiring the actual opening of a throttle valve and the actual pressure of an inlet of the throttle valve;
when the actual opening degree of the throttle valve does not reach the maximum opening degree, the pressure of the throttle valve outlet corresponding to the actual opening degree of the throttle valve and the actual pressure of the throttle valve inlet is taken as the actual pressure of the throttle valve outlet based on the mapping relation among the pressure of the throttle valve outlet, the pressure of the throttle valve inlet and the throttle valve opening degree.
The invention has the beneficial effects that: in a vehicle equipped with a mixer, the actual pressure difference between the actual pressure in the intake manifold and the actual pressure at the throttle outlet differs greatly from the target difference representing the throttle loss between the intake manifold and the throttle outlet under normal conditions, whereas if the mixer is removed, the actual pressure difference between the actual pressure in the intake manifold and the actual pressure at the throttle outlet differs little from the target difference. According to the natural gas engine mixer monitoring method, according to the working characteristics of the mixer, the actual pressure difference between the actual pressure in the air inlet manifold and the actual pressure at the outlet of the throttle valve is compared with the target difference value by utilizing throttling loss, when the actual pressure difference is smaller than the target difference value, the fact that the mixer is removed is confirmed, and the natural gas engine is limited by force, so that the aging of a catalyst for post-treatment due to the fact that the exhaust temperature of the natural gas engine rises after the mixer is removed is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a mixer and other piping connection according to an embodiment of the invention;
FIG. 2 is a main flow chart of a method for monitoring a natural gas engine mixer provided by an embodiment of the invention;
fig. 3 is a detailed flow chart of a method for monitoring a natural gas engine mixer according to an embodiment of the present invention.
In the figure:
1. an air line; 2. a throttle valve; 3. a mixer; 4. a gas line; 5. an EGR exhaust line; 6. an intake manifold; 7. a first pressure sensor; 8. and a second pressure sensor.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
For a vehicle using a natural gas engine, the vehicle is provided with a mixer, as shown in fig. 1, the mixer 3 is provided with an air inlet, an exhaust port, a natural gas inlet and an EGR exhaust port, wherein the air inlet is connected with an air pipeline 1, the exhaust port is connected with an air inlet manifold 6, the natural gas inlet is connected with a gas pipeline 4, the EGR exhaust port is connected with an EGR exhaust pipeline 5, a throttle valve 2 is arranged in the air pipeline 1, and the inlet of the throttle valve 2 is provided with a first pressure sensor 7 for detecting the pressure of the inlet of the throttle valve 2; a second pressure sensor 8 is provided in the intake manifold 6 for detecting the pressure in the intake manifold 6.
Since the mixer 3 has a problem of ice formation, some users may privately remove the mixer 3 in order to prevent the mixer 3 from ice formation, but such operations may cause problems such as deterioration of combustion effect, increase of gas consumption, accelerated aging of the post-treated catalyst, and the like. To this end, the present embodiment provides a natural gas engine mixer monitoring method to confirm whether the mixer 3 of the natural gas engine is privately removed, and when the mixer 3 is privately removed, to forcibly twist the natural gas engine to prevent the post-treated catalyst from being aged due to the removal of the mixer 3, ensuring the combustion effect.
Due to the vehicle in which the mixer 3 is installed, the actual pressure difference between the actual pressure in the intake manifold 6 and the actual pressure at the outlet of the throttle valve 2 differs greatly from the target difference representing the throttle loss between the intake manifold 6 and the outlet of the throttle valve 2 under normal conditions, whereas if the mixer 3 is removed, the actual pressure difference between the actual pressure in the intake manifold 6 and the actual pressure at the outlet of the throttle valve 2 differs little from the target difference.
When the actual opening degree of the throttle valve 2 reaches the maximum opening degree, the pressure at the inlet of the throttle valve 2 and the pressure at the inlet of the intake air outlet are substantially equal, and the mixer 3 has a throttling effect on the EGR exhaust gas and the natural gas, so that the pressure at the outlet of the throttle valve 2 is greater than the pressure in the intake manifold 6, thereby preventing the gas in the mixed gas from flowing backwards. After the removal of the mixer 3, the pressure loss of the EGR exhaust gas and the fuel gas is reduced, and the pressure difference between the pressure at the outlet of the throttle valve 2 and the pressure in the intake manifold 6 is reduced. Therefore, as shown in fig. 2, the present embodiment confirms that the mixer 3 is removed and forcibly twists the natural gas engine to reduce the exhaust temperature of the natural gas engine by comparing the actual pressure difference between the actual pressure in the intake manifold 6 and the actual pressure at the outlet of the throttle valve 2 with the target difference value, when the actual pressure difference between the actual pressure in the intake manifold 6 and the actual pressure at the outlet of the throttle valve 2 is smaller than the target difference value.
Fig. 3 is a detailed flowchart of a method for monitoring a natural gas engine mixer according to the present embodiment, and the diagnostic method is described in detail below with reference to fig. 3.
S1, starting the engine by electrifying.
S2, judging whether the actual rotation speed of the engine is larger than a preset rotation speed, if not, continuously judging whether the actual rotation speed of the engine is larger than the preset rotation speed, and if so, executing S3.
When the engine load is small, the engine speed and torque are small, the required EGR exhaust gas amount and fuel electricity are small, and at this time, the pressure loss of the mixer 3 is small, which is disadvantageous to make a larger difference between the actual pressure in the intake manifold 6 and the actual pressure at the outlet of the throttle valve 2 and the target difference value to determine whether the mixer 3 is removed, in which case the risk of erroneous judgment of the mixer 3 monitoring is large. Preferably, the preset rotation speed is greater than or equal to 1000r/min.
S3, judging whether the actual opening degree of the throttle valve reaches the maximum opening degree, if so, executing S4, and if not, returning to S2.
Since the natural gas engine is provided with the first pressure sensor 7 only at the inlet of the throttle valve 2, and is not provided with the pressure sensor at the outlet of the throttle valve 2, and when the actual opening of the throttle valve 2 reaches the maximum opening, the throttle valve 2 does not play a role in throttling, the pressure at the inlet of the throttle valve 2 and the pressure at the outlet of the throttle valve 2 are basically equal, and in order to obtain the actual pressure at the outlet of the throttle valve 2, when the actual opening of the throttle valve 2 reaches the maximum opening, the actual pressure at the inlet of the throttle valve 2 can be used as the actual pressure at the outlet of the throttle valve 2, and no change is required to be made to the structure of the natural gas engine.
In other embodiments, when the actual opening of the throttle valve 2 does not reach the maximum opening, a mapping relationship, such as a map, between the pressure at the outlet of the throttle valve 2, the pressure at the inlet of the throttle valve 2, and the opening of the throttle valve 2 may be established by a relationship between the pressure at the inlet of the throttle valve 2, the pressure at the outlet of the throttle valve 2, and the opening of the throttle valve 2, and based on the mapping relationship, the pressure at the outlet of the throttle valve 2 corresponding to the actual opening of the throttle valve 2 and the actual pressure at the inlet of the throttle valve 2 may be used as the actual pressure at the outlet of the throttle valve 2. However, when the actual opening degree of the throttle valve 2 reaches the maximum opening degree, the error is relatively large compared with the present embodiment in which the actual pressure at the inlet of the throttle valve 2 is directly used as the actual pressure at the outlet of the throttle valve 2.
S4, judging whether the actual pressure difference is smaller than the target difference, if so, executing S5, and if not, returning to S2.
Since the actual pressure difference between the pressure at the outlet of the throttle valve 2 and the pressure in the intake manifold 6 varies with the rotational speed and torque of the natural gas engine when the actual opening degree of the throttle valve 2 reaches the maximum opening degree, the torque of the natural gas engine directly affects the air flow rate into the mixer 3 through the throttle valve 2. For this reason, the present embodiment regards, as the target difference value, a pressure difference corresponding to the actual rotation speed of the natural gas engine and the air flow rate into the mixer 3 through the throttle valve 2, based on a map, such as a map or a data table, etc., between the pressure difference between the pressure in the intake manifold 6 and the pressure at the outlet of the throttle valve 2, the rotation speed of the natural gas engine, and the air flow rate into the mixer 3 through the throttle valve 2.
Because the air flow entering the mixer 3 through the throttle valve 2 is inconvenient to measure, the actual opening of the throttle pedal directly affects the torque of the engine, and the torque of the natural gas engine directly affects the air flow entering the mixer 3 through the throttle valve 2, the actual opening of the throttle pedal is obtained, and the torque of the natural gas engine corresponding to the actual opening of the throttle pedal is obtained based on the mapping relation between the opening of the throttle pedal and the torque of the natural gas engine; based on the map between the torque of the natural gas engine and the air flow rate into the mixer 3 through the throttle valve 2, the air flow rate into the mixer 3 through the throttle valve 2 corresponding to the torque of the natural gas engine is obtained.
S5, judging whether the duration time of the actual pressure difference smaller than the target difference value is longer than a preset duration time; if yes, the mixer is dismantled, a fault prompt of the dismantling of the mixer is reported, and S6 is executed; if not, returning to S2.
In order to prevent false alarm when the actual pressure difference is smaller than the target difference, the present embodiment calculates the duration for which the actual pressure difference is smaller than the target difference, and confirms that the mixer 3 is removed when the duration is longer than the preset duration. Once the mixer 3 is removed, a fault indication is given that the mixer 3 is removed.
S6, judging whether the actual exhaust temperature of the natural gas engine is greater than the target temperature, if so, executing S7, and otherwise, returning to S2.
And S7, judging whether the duration that the actual exhaust temperature of the natural gas engine is greater than the target temperature reaches the target duration, if so, forcibly limiting the torsion of the natural gas engine, and if not, not limiting the torsion of the natural gas engine.
After the mixer 3 is dismantled, air, natural gas and EGR waste gas can be unevenly mixed, and after the mixed gas enters a cylinder, combustion effect is poor, and slight knocking and fire problems exist, but because of the knocking and fire correction strategy in the vehicle control strategy, if the knocking and fire correction strategy can not achieve the corresponding effect, the temperature of the engine exhaust gas can be increased to different degrees, and the aging of a catalyst is accelerated to influence emission. Therefore, when the actual exhaust temperature of the natural gas engine is higher than the target temperature, the natural gas engine is forced to be limited in torsion, so that the combustion effect is ensured, and the problems of knocking and fire are avoided.
In order to prevent misjudgment, before the natural gas engine is forced to be limited, judging whether the duration of the actual exhaust temperature of the natural gas engine being greater than the target temperature reaches the target duration, and when the duration of the actual exhaust temperature of the natural gas engine being greater than the target temperature reaches the target duration, the natural gas engine is forced to be limited.
Since there is a direct relationship between the natural gas engine exhaust temperature and the air flow rate into the intake mixer 3 through the throttle valve 2, a map, such as a map or a data table, is established in advance between the natural gas engine exhaust temperature, the rotational speed of the natural gas engine, and the air flow rate into the intake mixer 3 through the throttle valve 2, and the natural gas engine exhaust temperature corresponding to the actual rotational speed of the natural gas engine and the actual air flow rate into the intake mixer 3 through the throttle valve 2 is set as the target temperature based on the map.
In consideration of the tolerance of the catalyst to different temperatures, a mapping relationship between the duration of the natural gas engine exhaust temperature being greater than the target temperature and the natural gas engine exhaust temperature, such as a map or a data table, is established in advance, and the duration of the natural gas engine exhaust temperature being greater than the target temperature, which corresponds to the actual exhaust temperature of the natural gas engine, is taken as the target duration.
When the duration that the actual exhaust temperature of the natural gas engine is greater than the target temperature reaches the target duration, the method for limiting the torque of the natural gas engine is forced, and comprises the following steps of:
acquiring the actual exhaust temperature of the natural gas engine and the actual torque of the natural gas engine; based on the mapping relation between the exhaust temperature of the natural gas engine and the torque limiting coefficient, obtaining the torque limiting coefficient corresponding to the actual exhaust temperature of the natural gas engine; the torque of the natural gas engine is forcibly limited to a target torque, which is=the actual torque of the natural gas engine×the torque limiting coefficient. The torque limiting coefficient is larger than 0 and smaller than 1.
The exhaust temperature of the natural gas engine in this embodiment refers to the temperature in the exhaust pipe of the natural gas engine.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Claims (10)
1. A method of monitoring a natural gas engine mixer, comprising the steps of:
acquiring the actual rotation speed of the natural gas engine, and acquiring the actual pressure in the air inlet manifold (6) and the actual pressure at the outlet of the throttle valve (2) when the actual rotation speed of the natural gas engine is greater than a preset rotation speed;
calculating an actual pressure difference between an actual pressure in the intake manifold (6) and an actual pressure at an outlet of the throttle valve (2);
and comparing the actual pressure difference with a target difference, and if the actual pressure difference is smaller than the target difference, confirming that the mixer (3) is dismantled and forcing the natural gas engine to be limited.
2. The natural gas engine mixer monitoring method according to claim 1, characterized in that the actual pressure of the inlet of the throttle valve (2) is obtained when the actual opening of the throttle valve (2) is maximum;
the actual pressure at the inlet of the throttle valve (2) is taken as the actual pressure at the outlet of the throttle valve (2).
3. The method of monitoring a natural gas engine mixer according to claim 2, wherein the target difference is obtained by:
acquiring the actual rotating speed of the natural gas engine and the actual air flow entering the air inlet mixer (3) through the throttle valve (2);
based on a map between a pressure difference between a pressure in the intake manifold (6) and a pressure at an outlet of the throttle valve (2), a rotational speed of the natural gas engine, and an air flow rate into the intake mixer (3) through the throttle valve (2), a pressure difference corresponding to an actual rotational speed of the natural gas engine and an actual air flow rate into the intake mixer (3) through the throttle valve (2) is taken as a target difference value.
4. A natural gas engine mixer monitoring method according to claim 1, characterized in that when the actual pressure difference is determined to be smaller than the target difference, if the duration of the actual pressure difference being smaller than the target difference is longer than a preset duration, the mixer (3) is determined to be removed.
5. The natural gas engine mixer monitoring method according to claim 1, characterized in that the actual exhaust gas temperature of the natural gas engine is obtained after confirming that the mixer (3) is removed and before forcing the natural gas engine to be limited in torsion;
when the actual exhaust temperature of the natural gas engine is greater than the target temperature, the natural gas engine is forced to be limited.
6. The method of monitoring a natural gas engine mixer of claim 5, wherein the target temperature is obtained by:
acquiring the actual rotating speed of the natural gas engine and the actual air flow entering the air inlet mixer (3) through the throttle valve (2);
based on a map between the natural gas engine exhaust temperature, the rotational speed of the natural gas engine, and the flow rate of air into the intake mixer (3) through the throttle valve (2), the natural gas engine exhaust temperature corresponding to the actual rotational speed of the natural gas engine and the actual flow rate of air into the intake mixer (3) through the throttle valve (2) is taken as a target temperature.
7. The method of claim 5, wherein prior to forcing the natural gas engine to be limited in torque, determining whether a duration of time that the actual exhaust temperature of the natural gas engine is greater than a target temperature reaches a target duration;
and when the duration that the actual exhaust temperature of the natural gas engine is greater than the target temperature reaches the target duration, the natural gas engine is forced to be limited.
8. The method of monitoring a natural gas engine mixer of claim 7, wherein the target time period is obtained by:
and taking the duration corresponding to the actual exhaust temperature of the natural gas engine as the target duration based on the mapping relation between the duration that the exhaust temperature of the natural gas engine is greater than the target temperature and the exhaust temperature of the natural gas engine.
9. A natural gas engine mixer monitoring method as claimed in any one of claims 1 to 8, wherein said forcing the natural gas engine to be limited in torque comprises:
acquiring the actual exhaust temperature of the natural gas engine and the actual torque of the natural gas engine;
based on the mapping relation between the exhaust temperature of the natural gas engine and the torque limiting coefficient, obtaining the torque limiting coefficient corresponding to the actual exhaust temperature of the natural gas engine;
the torque of the natural gas engine is forcibly limited to a target torque, which is=the actual torque of the natural gas engine×the torque limiting coefficient.
10. A natural gas engine mixer monitoring method according to any one of claims 1 to 8, characterized in that the actual opening of the throttle valve (2) and the actual pressure of the inlet of the throttle valve (2) are obtained;
when the actual opening degree of the throttle valve (2) does not reach the maximum opening degree, the pressure of the throttle valve (2) outlet corresponding to the actual opening degree of the throttle valve (2) and the actual pressure of the throttle valve (2) inlet is used as the actual pressure of the throttle valve (2) outlet based on the mapping relation among the pressure of the throttle valve (2) outlet, the pressure of the throttle valve (2) inlet and the opening degree of the throttle valve (2).
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