CN113153547B - Gas engine scavenging method, device, equipment, vehicle and storage medium - Google Patents

Gas engine scavenging method, device, equipment, vehicle and storage medium Download PDF

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Publication number
CN113153547B
CN113153547B CN202110496461.2A CN202110496461A CN113153547B CN 113153547 B CN113153547 B CN 113153547B CN 202110496461 A CN202110496461 A CN 202110496461A CN 113153547 B CN113153547 B CN 113153547B
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China
Prior art keywords
gas engine
gas
rotating speed
valve
engine
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CN202110496461.2A
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Chinese (zh)
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CN113153547A (en
Inventor
曹石
秦涛
孙明峰
赵婧如
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Priority to CN202110496461.2A priority Critical patent/CN113153547B/en
Publication of CN113153547A publication Critical patent/CN113153547A/en
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Classifications

    • 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
    • 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
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0404—Throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The embodiment of the invention provides a gas engine scavenging method, a device, equipment, a vehicle and a storage medium, wherein the method comprises the following steps: if the shutdown operation of the gas engine is detected, the gas cut-off valve is closed, the rotating speed of the gas engine is improved by utilizing residual gas in a gas engine pipeline, and when the rotating speed of the gas engine meets the preset requirement, the throttle valve and the EGR valve are opened to discharge water vapor in the gas engine through external air, so that the condition of condensing the water vapor of each part of the gas engine in a cold environment can be improved under the condition that no additional part is required to be added, and the performance of the gas engine is improved.

Description

Gas engine scavenging method, device, equipment, vehicle and storage medium
Technical Field
The invention relates to the field of gas engines, in particular to a gas engine scavenging method, a device, equipment, a vehicle and a storage medium.
Background
Gas engines are a generic term with engines containing different gaseous fuels, with natural engines being the most common type of gas engine in everyday life. When the gas engine is operated, the gaseous fuel burns to produce a large amount of water vapor, which is present in the various components of the gas engine. When the gas machine stops working, the water vapor can be condensed into ice or frost at a lower temperature to adhere to each part of the gas machine, so that the normal starting of the gas machine is affected next time.
In the prior art, generated water vapor can be led out by adding parts, so that the water vapor is prevented from being condensed on each part of the gas machine. However, the method requires modification of the original device, and the process is complex.
Disclosure of Invention
The embodiment of the invention provides a gas engine scavenging method, a device, equipment, a vehicle and a storage medium, which are used for improving the problem of water vapor condensation of a gas engine on the basis of not adding additional parts.
In a first aspect, an embodiment of the present invention provides a gas engine scavenging method, including:
if the gas machine stopping operation is detected, closing the gas shut-off valve;
the rotating speed of the gas engine is improved by using residual fuel gas in a gas engine pipeline;
and when the rotating speed of the gas engine meets the preset requirement, opening a throttle valve and an EGR valve to discharge water vapor in the gas engine through external air.
Optionally, if a gas engine shutdown operation is detected, closing the gas shut-off valve, including:
if the fact that the state of the T15 original signal is changed from the first value to the second value is detected, judging whether the locomotive parameter meets the preset condition or not; wherein the locomotive parameters include at least one of: vehicle speed, throttle opening, ambient temperature;
and if the locomotive parameter meets the preset condition and the second value of the T15 original signal is kept for more than the preset time, closing the gas shut-off valve.
Optionally, determining whether the locomotive parameter meets the preset condition includes:
judging whether the ambient temperature is less than or equal to a first preset threshold value;
if the accelerator opening is smaller than or equal to a first preset threshold value, judging whether the accelerator opening is equal to a second preset threshold value and whether the vehicle speed is smaller than or equal to a third preset threshold value;
and if the accelerator opening is equal to a second preset threshold value and the vehicle speed is smaller than or equal to a third preset threshold value, determining that the locomotive parameter meets a preset condition.
Optionally, using the remaining fuel gas in the gas engine pipeline, raising the rotation speed of the gas engine, including:
the rotating speed of the gas engine is controlled to be increased to a target rotating speed by utilizing residual fuel gas in a gas engine pipeline;
correspondingly, when the rotating speed of the gas engine meets the preset requirement, opening a throttle valve and an EGR valve, and comprising the following steps:
and opening a throttle valve and an EGR valve when the rotational speed of the gas engine is detected to fall back.
Optionally, after opening the throttle valve and the EGR valve, the method further includes:
judging whether the rotating speed of the gas engine is reduced to 0;
if the rotation speed is reduced to 0, the gas engine is towed back by the starter to idle.
Optionally, the reverse dragging gas machine idles through a starter, comprising:
determining idling duration and idling times;
and controlling the gas engine to idle for a plurality of times through the starter according to the idle times, wherein the duration of each idle time is determined by the idle time.
In a second aspect, an embodiment of the present invention provides a gas engine scavenging apparatus, the apparatus comprising:
the closing module is used for closing the gas shut-off valve when the gas machine shutdown operation is detected;
the lifting module is used for lifting the rotating speed of the gas engine by utilizing residual fuel gas in the gas engine pipeline;
and the opening module is used for opening the throttle valve and the EGR valve when the rotating speed of the gas engine meets the preset requirement so as to discharge the water vapor in the gas engine through the external air.
In a third aspect, an embodiment of the present invention provides a gas engine scavenging apparatus comprising:
at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the method of any one of the first aspects above.
In a fourth aspect, an embodiment of the present invention provides a vehicle including: a gas engine and a gas engine scavenging apparatus according to the third aspect.
In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium having stored therein computer-executable instructions for implementing the gas engine scavenging method according to any one of the first aspects above, when executed by a processor.
In a sixth aspect, embodiments of the invention provide a computer program product comprising a computer program which, when executed by a processor, implements a gas engine scavenging method according to any one of the first aspects above.
According to the scavenging method, the scavenging device, the scavenging equipment, the scavenging vehicle and the scavenging storage medium for the gas engine, if the shutdown operation of the gas engine is detected, the gas cut-off valve is closed, the rotating speed of the gas engine is increased by using residual gas in a gas engine pipeline, and when the rotating speed of the gas engine meets the preset requirement, the throttle valve and the EGR valve are opened to discharge water vapor in the gas engine through external air, so that the condition of water vapor condensation of each part of the gas engine in a cold environment can be improved under the condition that no additional part is needed, and the performance of the gas engine is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a gas engine scavenging method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a scavenging method for a natural gas engine according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a scavenging device of a gas engine according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a gas engine scavenging apparatus according to an embodiment of the present invention.
Specific embodiments of the present invention have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
The following describes the technical scheme of the present invention and how the technical scheme of the present invention solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
An application scenario provided by the embodiment of the present invention is explained below: the scheme provided by the embodiment of the invention relates to a gas machine. The common gas engine comprises natural gas engine (LNG (Liquefied Natural Gas, liquefied natural gas) and CNG (Compressed Natural Gas ) as fuel, and methane (CH) 4 ). When the natural gas engine is started, methane can burn in a cylinder and generate a large amount of water vapor, and in a cold environment, the water vapor remained in the cylinder, a spark plug, a mixer, an exhaust pipeline and an EGR (Exhaust Gas Recirculation ) system when the natural gas engine is stopped can cause frosting or ice if not timely emptied, so that the next starting and normal running of the engine are affected.
In some technologies, a condensed water discharging channel and a water discharging electromagnetic valve can be added on the mixer, and when the mixer has the risks of condensing water vapor into water and icing, the electromagnetic valve is opened to discharge water, so that the problem that an engine cannot be started and normally operates due to the fact that the condensed water in the mixer is frozen in extremely cold weather can be effectively prevented. This method requires additional components in the original device, and the process is complicated.
Therefore, the embodiment of the invention provides a scavenging method for a gas engine, when the gas engine on the whole vehicle is detected to stop working, a gas cut-off valve is closed, the rotating speed of the gas engine is regulated and controlled to the maximum rotation degree by using residual gas in a gas engine pipeline, when the rotating speed of the gas engine meets a certain condition, a throttle valve and an EGR valve are opened, and fresh air is used for scavenging and evacuating waste gas, so that the situation of icing or frosting caused by residual water vapor is avoided, and the problem of water vapor condensation of each part of the gas engine caused in a cold environment can be solved to a certain extent under the condition that no additional part is required to be added.
Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present invention. As shown in fig. 1, the temperature sensor receives the external temperature information and transmits the external temperature information to the control system. The control system judges the external temperature information, and when the external temperature information is lower than a certain threshold value, the control system indicates that the water vapor remained in the gas engine is easy to condense, can perform scavenging operation on the gas engine, and avoids the water vapor in the gas engine from condensing in each part.
Wherein the control system may be a system independent of the gas engine. Or, the method in the embodiment of the invention can also be applied to a control device in the gas engine, and the control device controls other components in the gas engine according to the external temperature information.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the case where there is no conflict between the embodiments, the following embodiments and features in the embodiments may be combined with each other.
Fig. 2 is a schematic flow chart of a scavenging method for a gas engine according to an embodiment of the present invention. The main execution body of the method in this embodiment may be an ECU (Electronic Control Unit ). As shown in fig. 2, includes:
step 201, if the gas engine shutdown operation is detected, the gas shutoff valve is closed.
Among them, gas engines are collectively called various gas engines, and the most common is a natural gas engine.
The gas shut-off valve may be provided between the means for storing gas and the means for burning gas to conduct or shut off a gas supply path through the gas shut-off valve.
Taking a natural gas engine as an example, when the gas cut-off valve is opened, natural gas can enter the cylinder from the gas storage device after passing through a pipeline, a mixer and other devices, and power is provided by combustion work; when the gas cut-off valve is opened, the gas storage device stops outputting the natural gas outwards.
When it is detected that the gas machine on the whole vehicle determines to stop the operation, the gas shut-off valve may be closed to stop the gas supply.
And 202, utilizing residual fuel gas in a gas engine pipeline to increase the rotating speed of the gas engine.
Optionally, after the gas stops being supplied, as the residual gas is still in the pipeline, the rotating speed of the gas machine can be increased under the condition that the residual gas can be consumed, so that the residual gas in the gas machine can be rapidly consumed.
And 203, opening a throttle valve and an EGR valve when the rotating speed of the gas engine meets the preset requirement so as to discharge the water vapor in the gas engine through the external air.
Wherein the throttle valve and the EGR valve may be used to regulate the flow of external fresh air into the gas engine. EGR is referred to as exhaust gas recirculation, i.e. an internal combustion engine after combustion separates a portion of the exhaust gases and introduces them into the intake side into the cylinders for combustion.
Alternatively, the throttle valve may be used to control the flow of gas into the cylinders and the EGR valve may be used to perform the function of exhaust gas recirculation. When the rotating speed of the gas engine meets the preset requirement, the throttle valve and the EGR valve can be fully opened, and the waste gas in the gas engine is scavenged and emptied by using the fresh air, so that the residual water vapor in the gas engine is discharged.
Alternatively, the preset requirement may be when the rotation speed starts to fall back. For example, when the rotational speed of the gas engine is raised to a certain value by using the residual fuel gas, the throttle valve and the EGR valve can be fully opened when the rotational speed of the gas engine falls back, and the water vapor in the gas engine is emptied by using the fresh air.
Optionally, the rotation speed of the gas engine can be raised by using the residual fuel gas to enable the rotation speed of the gas engine to reach the maximum rotation speed and then to continue for a period of time, and the rotation speed can be returned, or the rotation speed of the gas engine can be returned after reaching the maximum value.
In other alternative implementations, the throttle and EGR valves may also be opened upon detecting that the speed of the gas engine reaches the target speed.
According to the scavenging method for the gas engine, if the shutdown operation of the gas engine is detected, the gas cut-off valve is closed, the rotating speed of the gas engine is increased by using residual gas in the gas engine pipeline, and when the rotating speed of the gas engine meets the preset requirement, the throttle valve and the EGR valve are opened to discharge water vapor in the gas engine through external air, so that the condition of condensing the water vapor of each part of the gas engine in a cold environment can be improved without adding additional parts, and the performance of the gas engine is improved.
On the basis of the technical solution provided in the foregoing embodiment, optionally, if a gas machine shutdown operation is detected, closing the gas shutoff valve includes:
if the fact that the state of the T15 original signal is changed from the first value to the second value is detected, judging whether the locomotive parameter meets the preset condition or not; wherein the locomotive parameters include at least one of: vehicle speed, throttle opening, ambient temperature; and if the locomotive parameter meets the preset condition and the second value of the T15 original signal is kept for more than the preset time, closing the gas shut-off valve.
The T15 signal line may be a gas engine ECU power supply line, and the ECU starts executing the control program only when the T15 signal line is equal to 1, and the T15 original signal is used to indicate whether the T15 signal line is turned on, that is, the state of the T15 original signal is 1 after the T15 signal line is turned on, that is, 0 after the T15 signal line is turned off, and the debounce process is not performed. The debounce processing is to prevent the virtual connection of the T15 signal line, namely frequent connection and disconnection, and add a delay judgment module after the T15 original signal to obtain the T15 signal. For example, after the original signal state of T15 is equal to 1, if the original signal state lasts for 100ms (debounce time) to be 1, the corresponding T15 signal state is set to 1, otherwise, after the original signal state is changed from 1 to 0, the T15 signal state also satisfies the time judgment and then is changed from 1 to 0. Alternatively, the T15 signal may be an enable signal that controls the operation of the ECU. When the T15 signal state is 1, the ECU works normally, and when the T15 signal state is 0, the ECU stops working.
Optionally, when some emergency occurs, the driver may take some action, which causes the gas engine to stop rotating, affecting the normal running of the locomotive. For example, when the driver makes an emergency brake, the rotational speed of the gas engine may become 0 in a short time, but then the gas may return to the normal rotational speed. Therefore, when judging whether the gas engine is stopped, the judgment result is given when the rotating speed of the gas engine is not only 0, and a plurality of parameter indexes of the locomotive can be obtained to judge whether the gas engine is not rotated continuously.
Alternatively, the first value may be set to 1 and the second value to 0. The preset duration is 100ms.
When detecting that the state of the T15 original signal is changed from 1 to 0, indicating that the gas engine has an indication of stopping, in order to judge that the operation is not wrong by an operator and the locomotive is stopped temporarily, locomotive parameters such as a vehicle speed, an accelerator opening, an ambient temperature and the like can be further detected, and whether the gas engine determines to execute stopping operation or not is comprehensively considered. When the locomotive parameter is judged to meet the preset condition, and the time period when the original signal of T15 is kept to be 0 exceeds the preset time period, the scavenging operation is determined to be needed, at the moment, the gas valve is closed, the gas supply is stopped, and the operation of discharging water vapor is realized by adjusting the rotating speed and controlling the throttle valve and the EGR valve according to the method in the embodiment.
By detecting the state of the T15 original signal, the preset conditions met by the parameters of each locomotive and the time delay conditions met by the state of the T15 original signal are determined, and the factors in all aspects are comprehensively considered, so that whether the gas engine needs scavenging operation can be accurately judged, false triggering and false operation are avoided, and the working stability of the gas engine is improved.
Optionally, determining whether the locomotive parameter meets the preset condition includes:
judging whether the ambient temperature is less than or equal to a first preset threshold value;
if the accelerator opening is smaller than or equal to a first preset threshold value, judging whether the accelerator opening is equal to a second preset threshold value and whether the vehicle speed is smaller than or equal to a third preset threshold value;
and if the accelerator opening is equal to a second preset threshold value and the vehicle speed is smaller than or equal to a third preset threshold value, determining that the locomotive parameter meets a preset condition.
The first preset threshold value can be set to be-10, which means that when the ambient temperature is less than-10 ℃, residual water vapor after the gas engine works is easy to be condensed in each part in the gas engine, and the scavenging operation can be continuously carried out on the residual water vapor of the gas engine. And setting a second preset threshold value as 0, and setting a third preset threshold value as 0, wherein when the accelerator opening is equal to 0 and the vehicle speed is less than or equal to 0km/h, the locomotive parameters meet the conditions, and the operation is stopped.
Specifically, when the external environment temperature is-15 degrees and is smaller than a first preset threshold value, whether the accelerator opening and the vehicle speed of the locomotive are 0 or not can be judged, if the accelerator opening and the vehicle speed of the locomotive are 0, the locomotive parameters meet preset conditions, and the gas engine does not work any more.
If one of the parameters does not meet the corresponding condition, the condition that the shutdown operation is not met is considered to be met, and the state of the T15 original signal and each parameter need to be continuously monitored.
By setting the preset threshold value, firstly, the influence of the ambient temperature on the icing of each part of the gas engine is considered, then the accelerator opening and the vehicle speed are judged, and whether each parameter meets the preset condition is judged, so that the scavenging method is more accurate and reliable in application.
Optionally, using the remaining fuel gas in the gas engine pipeline, raising the rotation speed of the gas engine, including:
the rotating speed of the gas engine is controlled to be increased to a target rotating speed by utilizing residual fuel gas in a gas engine pipeline;
correspondingly, when the rotating speed of the gas engine meets the preset requirement, opening a throttle valve and an EGR valve, and comprising the following steps: and opening a throttle valve and an EGR valve when the rotational speed of the gas engine is detected to fall back.
The target rotating speed can be set to be the maximum rotating speed of the gas engine in the current running process of the locomotive, and a larger rotating speed can be set according to an empirical value, so that the rotating speed of the gas engine can just reach the set target rotating speed or not reach the set target rotating speed after the residual fuel gas is burnt out.
Optionally, when the rotational speed of the gas engine reaches the maximum value and falls back, the throttle valve and the EGR valve are all opened, and the fresh air is used for scavenging and evacuating the waste gas. The exhaust gas contains a large amount of water vapor, and the sweeping of the exhaust gas is actually the sweeping of the water vapor.
When the throttle valve and the EGR valve are opened, the engine can be opened when the rotation speed of the engine reaches the maximum value and just falls back, so that the scavenging effect is good, and exhaust gas can be emptied to a large extent.
The rotating speed of the gas engine is controlled to reach the maximum value by utilizing the residual fuel gas, so that the residual fuel gas can be consumed as soon as possible, the rotating speed of the gas engine is furthest increased, and when the rotating speed of the gas engine falls back, the throttle valve and the EGR valve are opened, so that waste gas generated by consuming the fuel gas can be swept out, and a large amount of water vapor is prevented from remaining in the gas engine.
Optionally, after opening the throttle valve and the EGR valve, the method further includes:
judging whether the rotating speed of the gas engine is reduced to 0;
if the rotation speed is reduced to 0, the gas engine is towed back by the starter to idle.
When the throttle valve and the EGR valve are fully opened, the rotational speed of the gas engine slowly drops to 0, and the rotation is stopped. When the rotation speed of the gas engine is detected to be 0, the exhaust gas generated by fuel combustion is possibly not completely swept out, and the starter can be used for backing the gas engine to idle, so that the residual exhaust gas is further subjected to scavenging and emptying treatment.
After the scavenging and emptying treatment of the waste gas is carried out by opening the throttle valve and the EGR valve, the starter is used for backing the gas machine to idle and sweep out the residual waste gas, so that the waste gas can be completely discharged, the residual water vapor is prevented from being frozen on each part of the gas machine, and the water vapor emptying effect is further improved.
Optionally, the reverse dragging gas machine idles through a starter, comprising:
determining idling duration and idling times; and controlling the gas engine to idle for a plurality of times through the starter according to the idle times, wherein the duration of each idle time is determined by the idle time.
When the starter drags the gas engine reversely, the time of idling of the gas engine and the number of idling can be set, and after the gas engine rotates for the specified idling time and the specified number of idling, the T15 signal state is changed from 1 to 0, namely, the waste gas in the gas engine is cleaned, and the gas engine stops working.
The idle time length of each time can be set to be the same, and the idle times can be set manually, so that the residual water vapor in the gas machine is completely discharged after the gas machine meets the idle time length and the idle times.
Specifically, the time of each idling of the gas engine can be set to 5 minutes, and the number of idling is 3. When the gas engine execution operation is completed, the T15 signal state changes from 1 to 0.
By setting the idle time and the idle time, the waste gas in the gas machine can be completely discharged by using the starter to drag the gas machine, so that no residual water vapor is remained in the gas machine.
Fig. 3 is a schematic flow chart of a scavenging method of a natural gas engine according to an embodiment of the present invention. As shown in fig. 3, parameters such as a vehicle speed, an accelerator opening, a T15 original signal state, a T15 signal state, an engine speed, an ambient temperature and the like of the locomotive can be acquired first, and whether the T15 original signal state is changed from 1 to 0 can be judged. And if the state of the original signal of the T15 is not changed, acquiring the parameters again for judgment, and if the state of the original signal of the T15 is changed from 1 to 0, judging whether the accelerator opening, the vehicle speed and the ambient temperature meet preset conditions or not. If the ambient temperature does not meet the preset condition, the current ambient temperature does not meet the condition of water vapor condensation in the engine, scavenging operation is not needed, if the ambient temperature meets the preset condition, the current ambient temperature is easy to cause the condition of water vapor condensation in the engine, scavenging operation is needed, whether the accelerator opening and the vehicle speed meet the preset condition is judged, if the condition is not met, all parameters of the locomotive are required to be acquired again for judgment, and if the condition is met, the T15 signal state delay is changed from 1 to 0. The delay here indicates that the T15 signal state does not change from 1 to 0 immediately after the T15 original signal state changes to 0 and the locomotive parameter satisfies the preset condition. Alternatively, it may be changed from 1 to 0 after the scavenging operation is performed.
When the T15 signal state needs to be changed from 1 to 0 in a delay manner, the locomotive is indicated to be stopped, the gas cut-off valve is closed, gas supply is forbidden, the engine speed is controlled to a preset target speed, and the gas remained in the engine is consumed. When the rotation speed of the engine reaches the maximum value and falls back, the throttle valve and the EGR valve can be maintained at the full-open position, the engine is stopped normally (fuel-burning automatic stop), and then whether the rotation speed of the engine is equal to 0 is judged. If the engine speed is not 0, the throttle valve and the EGR valve can be kept open until the engine speed is 0, the engine is started and a period of time T is maintained, the operation steps can be calibrated and executed for a plurality of times, when the gas engine stops rotating, the T15 signal state is changed from 1 to 0, the scavenging operation of the engine is finished, and the residual waste gas in the engine is completely exhausted.
Fig. 4 is a schematic structural diagram of a gas engine scavenging device according to an embodiment of the present invention. As shown in fig. 4, the gas engine scavenging apparatus provided in this embodiment may include:
a closing module 401 for closing the gas shutoff valve when a gas machine shutdown operation is detected;
a lifting module 402, configured to lift a rotation speed of the gas engine by using residual fuel gas in a gas engine pipeline;
and an opening module 403, configured to open a throttle valve and an EGR valve to exhaust water vapor in the gas engine through external air when the rotational speed of the gas engine meets a preset requirement.
Optionally, the closing module 401 is specifically configured to:
if the fact that the state of the T15 original signal is changed from the first value to the second value is detected, judging whether the locomotive parameter meets the preset condition or not; wherein the locomotive parameters include at least one of: vehicle speed, throttle opening, ambient temperature;
and if the locomotive parameter meets the preset condition and the second value of the T15 original signal is kept for more than the preset time, closing the gas shut-off valve.
Optionally, the shutdown module 401 is specifically configured to, when determining whether the locomotive parameter meets the preset condition:
judging whether the ambient temperature is less than or equal to a first preset threshold value;
if the accelerator opening is smaller than or equal to a first preset threshold value, judging whether the accelerator opening is equal to a second preset threshold value and whether the vehicle speed is smaller than or equal to a third preset threshold value;
and if the accelerator opening is equal to a second preset threshold value and the vehicle speed is smaller than or equal to a third preset threshold value, determining that the locomotive parameter meets a preset condition.
Optionally, the lifting module 402 is specifically configured to:
the rotating speed of the gas engine is controlled to be increased to a target rotating speed by utilizing residual fuel gas in a gas engine pipeline;
correspondingly, when the rotation speed of the gas engine meets the preset requirement, the opening module 403 is specifically configured to:
and opening a throttle valve and an EGR valve when the rotational speed of the gas engine is detected to fall back.
Optionally, the opening module 403 is further configured to, after opening the throttle valve and the EGR valve:
judging whether the rotating speed of the gas engine is reduced to 0;
if the rotation speed is reduced to 0, the gas engine is towed back by the starter to idle.
Optionally, the opening module 403 is specifically configured to, when the reverse towing gas engine idles through the starter:
determining idling duration and idling times;
and controlling the gas engine to idle for a plurality of times through the starter according to the idle times, wherein the duration of each idle time is determined by the idle time.
The device provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 1 to 3, and its implementation principle and technical effects are similar, and are not described here again.
Fig. 5 is a schematic structural diagram of a gas engine scavenging apparatus according to an embodiment of the present invention. As shown in fig. 5, the apparatus provided in this embodiment may include: at least one processor 51 and a memory 52;
the memory 52 stores computer-executable instructions;
the at least one processor 51 executes computer-executable instructions stored in the memory 52 such that the at least one processor 51 performs the method of any of the embodiments described above.
Wherein the memory 52 and the processor 51 may be connected by a bus 53.
The specific implementation principle and effect of the device provided in this embodiment may refer to the relevant descriptions and effects corresponding to the embodiments shown in fig. 1 to 3, which are not repeated here.
The embodiment of the invention also provides a vehicle, which comprises a gas engine and the gas engine scavenging equipment as shown in fig. 5.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the gas engine scavenging method provided by any one of the embodiments of the invention.
The embodiment of the invention also provides a computer program product, which comprises a computer program, and the computer program realizes the gas engine scavenging method according to any one of the embodiments of the invention when being executed by a processor.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to implement the solution of this embodiment.
In addition, each functional module in the embodiments of the present invention may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.
The integrated modules, which are implemented in the form of software functional modules, may be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or processor to perform some of the steps of the methods described in the various embodiments of the invention.
It should be appreciated that the processor may be a central processing unit (Central Processing Unit, CPU for short), other general purpose processors, digital signal processor (Digital Signal Processor, DSP for short), application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile memory NVM, such as at least one magnetic disk memory, and may also be a U-disk, a removable hard disk, a read-only memory, a magnetic disk or optical disk, etc.
The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component Interconnect, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present invention are not limited to only one bus or to one type of bus.
The storage medium may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuits, ASIC for short). It is also possible that the processor and the storage medium reside as discrete components in an electronic device or a master device.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (7)

1. A gas engine scavenging method, comprising:
if the gas machine stopping operation is detected, closing the gas shut-off valve;
the rotating speed of the gas engine is controlled to be increased to a target rotating speed by utilizing residual fuel gas in a gas engine pipeline;
when detecting that the rotating speed of the gas engine falls back, opening a throttle valve and an EGR valve, and judging whether the rotating speed of the gas engine is reduced to 0; if the rotation speed is reduced to 0, the gas engine is dragged by the starter in a reverse way to idle;
so as to discharge the water vapor in the gas machine through the external air;
if a gas engine shutdown operation is detected, closing the gas shut-off valve, including:
if the fact that the state of the T15 original signal is changed from the first value to the second value is detected, judging whether the locomotive parameter meets the preset condition or not; wherein the locomotive parameters include at least one of: vehicle speed, throttle opening, ambient temperature;
and if the locomotive parameter meets the preset condition and the second value of the T15 original signal is kept for more than the preset time, closing the gas shut-off valve.
2. The method of claim 1, wherein determining whether the locomotive parameter meets a predetermined condition comprises:
judging whether the ambient temperature is less than or equal to a first preset threshold value;
if the accelerator opening is smaller than or equal to a first preset threshold value, judging whether the accelerator opening is equal to a second preset threshold value and whether the vehicle speed is smaller than or equal to a third preset threshold value;
and if the accelerator opening is equal to a second preset threshold value and the vehicle speed is smaller than or equal to a third preset threshold value, determining that the locomotive parameter meets a preset condition.
3. The method of claim 1, wherein the reverse towing the gas engine by the starter is idle, comprising:
determining idling duration and idling times;
and controlling the gas engine to idle for a plurality of times through the starter according to the idle times, wherein the duration of each idle time is determined by the idle time.
4. A gas engine scavenging apparatus, the apparatus comprising:
the closing module is used for closing the gas shut-off valve when the gas machine shutdown operation is detected;
the lifting module is used for controlling the rotating speed of the gas engine to be lifted to a target rotating speed by utilizing residual fuel gas in a gas engine pipeline;
the opening module is used for opening the throttle valve and the EGR valve when detecting that the rotating speed of the gas engine falls back, and judging whether the rotating speed of the gas engine is reduced to 0; if the rotating speed is reduced to 0, the gas machine is dragged by the starter in a reverse way to idle so as to discharge water vapor in the gas machine through external air;
the closing module is specifically configured to determine whether the locomotive parameter meets a preset condition if it is detected that the state of the T15 original signal is changed from the first value to the second value; wherein the locomotive parameters include at least one of: vehicle speed, throttle opening, ambient temperature;
and if the locomotive parameter meets the preset condition and the second value of the T15 original signal is kept for more than the preset time, closing the gas shut-off valve.
5. A gas engine scavenging apparatus, characterized by comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored in the memory, causing the at least one processor to perform the gas engine scavenging method of any one of claims 1-3.
6. A vehicle, characterized by comprising: a gas engine and a gas engine scavenging apparatus according to claim 5.
7. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out a gas engine scavenging method according to any one of claims 1-3.
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