CN113586269A - Three-way catalyst protection method and device, vehicle and storage medium - Google Patents
Three-way catalyst protection method and device, vehicle and storage medium Download PDFInfo
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- CN113586269A CN113586269A CN202111030859.3A CN202111030859A CN113586269A CN 113586269 A CN113586269 A CN 113586269A CN 202111030859 A CN202111030859 A CN 202111030859A CN 113586269 A CN113586269 A CN 113586269A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000002485 combustion reaction Methods 0.000 claims description 35
- 239000000446 fuel Substances 0.000 claims description 35
- 238000010304 firing Methods 0.000 claims description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 230000001012 protector Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 9
- 239000003345 natural gas Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 238000013021 overheating Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to the technical field of vehicles, and particularly discloses a three-way catalyst protection method, a device, a vehicle and a storage medium.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a three-way catalyst protection method and device, a vehicle and a storage medium.
Background
The three-way catalyst of the engine is a natural gas engine aftertreatment core component, and when the natural gas engine runs, an internal combustion engine of the engine burns fuel, such as: burning methane CH4Carbon monoxide CO, nitrogen oxides NOx, hydrocarbons HC and the like in the engine exhaust gas causing air pollution are generated, and at present, the reaction is often performed by using noble metals in the three-way catalyst to purify CO, nitrogen oxides NOx, hydrocarbons HC and the like in the engine exhaust gas,NOx, HC, and the like.
However, when the mixture fails to be combusted in the cylinder, the unburned mixture enters the catalyst for combustion, which causes the temperature of the catalyst to exceed its heat resistance limit, thereby damaging the three-way catalyst, resulting in aftermarket complaints and pollution of the atmosphere.
Disclosure of Invention
The invention aims to: provided are a three-way catalyst protection method, device, vehicle and storage medium, so as to prevent the three-way catalyst from being damaged due to overheating.
In one aspect, the present invention provides a three-way catalyst protection method, including:
acquiring the total number of times of ignition and the total number of times of non-ignition in a set time period in the combustion cycle process of a cylinder of an engine;
determining a misfire rate based on the total number of firings and the total number of non-firings;
when the misfire rate is greater than a set value;
and deactivating the cylinder to stop fuel supply to the cylinder.
The method is used as a preferred technical scheme of a three-way catalyst protection method, and the real-time temperature of the three-way catalyst is collected after the cylinder is disconnected;
when the real-time temperature is less than or equal to the set temperature;
the cylinder is refueled after N combustion cycles.
The method is used as a preferred technical scheme of a three-way catalyst protection method, and the real-time temperature of the three-way catalyst is collected after the cylinder is disconnected;
when the real-time temperature is greater than or equal to the set temperature;
keeping the cylinder deactivated and until the engine stalls.
As a preferred technical scheme of the three-way catalyst protection method, after the cylinder is disconnected, a warning is sent out through an alarm device.
The preferable technical scheme of the three-way catalyst protection method further comprises the following steps before the misfire rate of the cylinder of the engine is obtained:
acquiring the real-time working condition of an engine;
acquiring a corresponding relation graph of working conditions and set values;
and inputting the real-time working condition into the corresponding relation graph and outputting the set value.
The invention also provides a three-way catalyst protector, which comprises:
the device comprises a parameter acquisition module, a parameter acquisition module and a parameter calculation module, wherein the parameter acquisition module is used for acquiring the total times of ignition and the total times of non-ignition of a cylinder of an engine in a set time period in the combustion cycle process;
a misfire rate determination module to determine a misfire rate based on the total number of firings and the total number of non-firings;
the misfire rate comparison module is used for comparing the misfire rate with a set value;
and the execution module is used for cutting off the cylinder when the misfire rate is greater than a set value.
As a preferable technical scheme of the three-way catalyst protector, the three-way catalyst protector further includes:
the temperature acquisition module is used for acquiring the real-time temperature of the three-way catalyst after the cylinder is broken;
and the execution module is also used for re-supplying fuel to the cylinder after N combustion cycles when the real-time temperature is less than or equal to the set temperature.
The present invention also provides a vehicle comprising:
an engine;
the three-way catalyst is arranged on an exhaust gas discharge pipe of the engine;
an ignition device for igniting fuel in a cylinder of the engine;
a controller;
the sensor is used for acquiring the total times of non-ignition and the total ignition times of the ignition device in a set time period in the combustion cycle process of the cylinder and sending the total times of non-ignition and the total ignition times to the controller;
a control valve for closing a fuel supply line that supplies fuel to the cylinder when the misfire rate is greater than a set value;
a memory for storing one or more programs;
the one or more programs, when executed by the controller, cause the controller to control a vehicle to implement the three-way catalyst guard method described in any of the above aspects.
As a preferred technical scheme of the vehicle, the engine is a natural gas engine.
The present invention also provides a storage medium having stored thereon a computer program that, when executed by a controller, implements the three-way catalyst protection method described in any of the above aspects.
The invention has the beneficial effects that:
the invention provides a three-way catalyst protection method, which comprises the steps of collecting the total ignition times and the total non-ignition times of an air cylinder in a set time period, determining a fire catching rate based on the total ignition times and the total non-ignition times, comparing the fire catching rate with a set value, and disconnecting the air cylinder when the fire catching rate is greater than the set value, so as to ensure that the temperature of the three-way catalyst does not exceed the threshold temperature at which the three-way catalyst can normally work, so as to protect the three-way catalyst and prevent the three-way catalyst from being damaged due to overheating.
The invention provides a three-way catalyst protector and a vehicle, wherein the three-way catalyst protector acquires the total times of ignition and the total times of non-ignition in a set time period in the combustion cycle process of a cylinder of an engine through a parameter acquisition module, and determines the misfire rate through a misfire rate determination module based on the total times of ignition and the total times of non-ignition; comparing the misfire rate with a set value through a misfire rate comparison module; when the misfire rate is larger than a set value, the cylinder is cut off through the execution module, so that the temperature of the three-way catalyst cannot exceed the threshold temperature of the three-way catalyst capable of working normally, the three-way catalyst is protected, and the three-way catalyst is prevented from being damaged due to overheating.
The invention also provides a storage medium, which stores a computer program, and when the program is executed by a controller, the three-way catalyst protection method is realized, and the same beneficial effects as the three-way catalyst protection method are achieved.
Drawings
FIG. 1 is a flow chart of a three-way catalyst protection method provided in a first embodiment of the present invention;
FIG. 2 is a flowchart of a three-way catalyst guard method provided in the second embodiment of the present invention;
FIG. 3 is a flowchart of a three-way catalyst guard method provided in the third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a three-way catalyst protector provided in the fourth embodiment of the invention;
fig. 5 is a schematic structural diagram of a vehicle provided in the fifth embodiment of the present invention.
In the figure:
410. a parameter acquisition module; 420. a misfire rate determination module; 430. a misfire rate comparison module; 440. an execution module;
510. an engine; 520. a three-way catalyst; 530. an ignition device; 540. a controller; 550. a sensor; 560. and (4) controlling the valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, a three-way catalyst is an aftertreatment device that can reduce NOx, CO, HC emissions simultaneously. Misfire refers to the phenomenon in which a mixture of fuel and air is not ignited within a cylinder. Cylinder deactivation refers to the phenomenon in which a particular cylinder stops injecting fuel. And the combustion cycle refers to a process that each cylinder does work and drives the crankshaft to rotate 720 degrees. Misfire rate, which is the ratio of the total number of misfires to the total number of firings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
The three-way catalyst is a natural gas engine aftertreatment core component, and when the natural gas engine runs, an internal combustion engine of the engine burns fuel, such as: burning methane CH4Carbon monoxide CO, nitrogen oxides NOx, hydrocarbons HC and the like in the engine exhaust gas causing air pollution are generated, and at present, pollutants such as CO, NOx, HC and the like in the engine exhaust gas are often purified by reacting with precious metals in the three-way catalyst. However, when the mixture fails to be combusted in the cylinder, the unburned mixture enters the catalyst for combustion, which causes the temperature of the catalyst to exceed its heat resistance limit, thereby damaging the three-way catalyst, resulting in aftermarket complaints and pollution of the atmosphere.
Therefore, the embodiment provides a three-way catalyst protection method, and the three-way catalyst protection method can solve the problem that a mixture of fuel and air is combusted in a three-way catalyst due to cylinder fire, so that the three-way catalyst fails. The three-way catalyst protection method may be performed by a three-way catalyst protection device, which may be implemented in software and/or hardware, and integrated in a vehicle.
Specifically, as shown in fig. 1, the three-way catalyst guard method includes the following steps.
S110: the total number of firings and the total number of non-firings of a cylinder of the engine over a set period of time during a combustion cycle are obtained.
It will be appreciated that the engine has a plurality of cylinders and that the firing order of the cylinders follows the rotation of the crankshaft, and that the plurality of cylinders drive the crankshaft to rotate 720 ° and the 720 ° rotation of the crankshaft is shared by each cylinder during a combustion cycle to form a segment window through which the cylinder drives the crankshaft.
When a certain cylinder is ignited, timing is started, ignition can be performed through an ignition device, such as a spark plug, after ignition is started, the spark plug is ignited once every fixed time before ignition is not successful, when the time length of the set time period is accumulated, the timing is stopped, and the counted total number of times of ignition and the total number of times of non-ignition in the time period are output. The ignition result may be that the cylinder has been successfully ignited or not ignited, and when the ignition is successful, the total number of times of ignition is more than that of non-ignition; when not ignited, the total number of ignitions is equal to the total number of unignitions. Thus, the total number of firings may be determined by the total number of non-firings, and whether the firings were successful within a set period of time. Wherein misfire may be deemed to occur in the cylinder when the ignition is not successful for a set period of time.
The total number of misfires and total number of ignitions can be obtained by sensors, and it is known in the art to obtain the total number of misfires and total number of ignitions by sensors, which was disclosed in the earlier patent application No. CN201710632790.9, gaseous fuel engine spark plug failure detection.
In other embodiments, the total number of times of non-ignition may also be obtained by a sensor, and since the total number of times of non-ignition may be equal to or more than the total number of times of non-ignition, after the total number of times of non-ignition is detected, whether the cylinder successfully ignites may be determined, and the total number of times of ignition may also be calculated. Specifically, when the ignition is successful, the cylinder normally works, the crankshaft normally rotates, and when the ignition is unsuccessful, the crankshaft only rotates by means of inertia, so that whether the ignition is successful can be judged by detecting whether the rotation speed of the crankshaft passing through the segmented window is smaller than a set speed value, and the detection can be performed by a rotation speed sensor. When the ignition is judged to be successful, the total ignition frequency may be equal to the total number of times of non-ignition plus one time; when it is judged that the ignition is not successful, the total number of times of ignition is equal to the total number of times of non-ignition.
S120: the misfire rate is determined based on the total number of firings and the total number of non-firings.
The controller may calculate the misfire rate by calculating a ratio of the total number of firings to the total number of non-firings.
S130: the misfire rate and the set value are compared in magnitude, and when the misfire rate is greater than the set value, S140 is performed. If the misfire rate is less than or equal to the set value, the routine returns to S110.
The set value can be adjusted according to the specific model of the three-way catalytic converter and the model of the engine, and can be determined through a large number of previous experiments.
S140: the cylinder is deactivated and the fuel supply to the cylinder is stopped.
Each cylinder of the engine is provided with a fuel supply pipeline, the fuel supply pipelines are used for supplying fuel to the corresponding cylinders, each fuel supply pipeline is provided with a control valve, the control valves adopt an electric control mode, and the fuel supply pipelines can be closed or opened through a controller.
It is understood that when each cylinder of the engine is normally operated, the temperature of the three-way catalyst is approximately between 500 ℃ and 600 ℃, and when a cylinder misfire occurs, the fuel that is not combusted can be combusted in the three-way catalyst, which in turn tends to cause the temperature of the three-way catalyst to exceed its threshold temperature for proper operation. A threshold temperature, such as 950 c to 980 c, will cause the three-way catalyst to fail when the temperature of the three-way catalyst exceeds the threshold temperature. In order to avoid the failure of the three-way catalyst, in the embodiment, when the misfire rate of at least one cylinder is greater than the set value during the combustion cycle, it can be ensured that the temperature of the three-way catalyst does not exceed the threshold temperature thereof.
It is noted that the three-way catalyst protection method described above is performed during each combustion cycle, which ensures that the three-way catalyst is most fully protected during engine operation.
According to the three-way catalyst protection method provided by the embodiment, the misfire rate of the air cylinder in the set time period is collected and compared with the set value, and when the misfire rate is larger than the set value, the air cylinder is cut off, so that the temperature of the three-way catalyst cannot exceed the threshold temperature of the three-way catalyst capable of normally working, the three-way catalyst is protected, and the three-way catalyst is prevented from being damaged due to overheating.
Example two
As shown in fig. 2, this embodiment provides a three-way catalyst protection method, which is further embodied on the basis of the first embodiment, and includes the following steps.
S210: the total number of firings and the total number of non-firings of a cylinder of the engine over a set period of time during a combustion cycle are obtained.
S220: the misfire rate is determined based on the total number of firings and the total number of non-firings.
S230: the misfire rate and the set value are compared in magnitude, and when the misfire rate is greater than the set value, S240 is performed. If the misfire rate is less than or equal to the set value, the routine returns to S210.
S240: the cylinder is deactivated and the fuel supply to the cylinder is stopped.
S250: and sending out a warning through the warning device.
The controller accessible display screen is reported to the police and is indicateed, also can report to the police through sound, light alarm device and indicate to warn the driver, the cylinder breaks jar this moment, and engine output torque will be limited, when being in the heavy load operating mode of low-speed high load very much, needs in time to deal with, takes place in order to avoid unfavorable phenomena such as the vehicle nest of lying prone.
S260: the real-time temperature of the three-way catalyst is collected.
The real-time temperature of the three-way catalyst may be collected by a temperature sensor disposed in the three-way catalyst.
S270: and comparing the real-time temperature with the set temperature. When the real-time temperature is less than or equal to the set temperature, executing S280; if the real-time temperature is greater than the set temperature, S260 is re-executed.
The set temperature can be set according to the requirement, for example, the set temperature can be 600 ℃ to 650 ℃.
S280: the cylinders are refueled after N combustion cycles.
The control valve may be opened by the controller to cause the fuel supply line to resume supplying fuel to the cylinder.
Because the probability of the fire occurring in the cylinder is not high, particularly the probability of two continuous fires is not high, when the real-time temperature is less than or equal to the set temperature, the three-way catalyst is under the current temperature, after N combustion cycles, if no other cylinder fires in the N combustion cycles, the real-time temperature of the three-way catalyst is reduced, and even if one cylinder of the engine fires in the N +1 combustion cycles, the temperature of the three-way catalyst can be ensured not to exceed the threshold temperature of the three-way catalyst. Wherein the specific value of N can be given empirically.
Alternatively, if the misfire rate of another cylinder of the engine exceeds the set value in the next N combustion cycles after the cylinder is deactivated, the cylinder is continuously fueled for N combustion cycles, i.e., the cylinder is reactivated after 2N combustion cycles after the cylinder is deactivated. This ensures to some extent that the three-way catalyst can function properly with a high probability before the cylinder is refueled.
It can be understood that when one of the cylinders of the engine is deactivated, the engine will shake to a greater extent, which will have a certain negative effect on the engine and will affect the experience of drivers and passengers, and on the premise of not affecting the normal operation of the three-way catalyst, the deactivated cylinder is re-fueled as soon as possible, so as to eliminate the above negative factors.
As an alternative, step S280 may be replaced by:
the cylinder is held deactivated until the engine stalls. When the engine is started next time, the deactivated cylinders may be refueled. By the arrangement, the normal operation of the three-way catalyst can be fully ensured.
According to the three-way catalyst protection method provided by the embodiment, the misfire rate of the air cylinder in the set time period is collected and compared with the set value, and when the misfire rate is larger than the set value, the air cylinder is cut off, so that the temperature of the three-way catalyst cannot exceed the threshold temperature of the three-way catalyst capable of normally working, the three-way catalyst is protected, and the three-way catalyst is prevented from being damaged due to overheating. And when the cylinder is broken, the real-time temperature of the three-way catalyst is acquired, and when the real-time temperature is less than or equal to the set temperature, the fuel is supplied to the cylinder again after N combustion cycles, so that the negative effects of shaking and the like of the engine caused by the cylinder breakage can be avoided on the premise of ensuring the normal operation of the three-way catalyst.
EXAMPLE III
As shown in fig. 3, this embodiment provides a three-way catalyst protection method, which can be further embodied on the basis of the first embodiment, and includes the following steps.
S310: and acquiring the real-time working condition of the engine.
The real-time working conditions of the engine such as heavy-load working conditions, normal working conditions and light-load working conditions can be evaluated through the output torque, the vehicle speed and the opening degree of an accelerator of the engine. The controller is connected with an ECU of the whole vehicle to acquire the output torque, the vehicle speed and the accelerator opening of the current engine, and inputs the acquired output torque and the vehicle speed to the relation graph of the output torque, the vehicle speed and the working condition to output the corresponding working condition, namely the real-time working condition of the engine. The relation graph of the output torque, the vehicle speed and the working condition can be obtained through a large number of early tests. It is understood that the ECU acquires the output torque of the engine through a torque sensor integrated in the vehicle, acquires the vehicle speed through a speed sensor integrated in the vehicle, and detects the opening degree of the accelerator through a position sensor provided on the accelerator pedal or a flow sensor provided on the accelerator.
S320: and obtaining a corresponding relation graph of the working condition and the set value.
The corresponding relation graph of the working condition and the set value can be obtained through a large number of tests in the early stage and is stored in the controller in advance. It can be understood that, when the vehicle normally runs, the temperature of the three-way catalyst also differs under different working conditions, and the air inflow of the cylinder also differs, so that when the cylinder catches fire, the amount of the mixture of the fuel and the air entering the three-way catalyst also differs, and then different set values need to be set corresponding to different working conditions. And thus the corresponding misfire rates may also differ.
S330: and inputting the real-time working condition into the corresponding relation graph and outputting a set value.
S340: the total number of firings and the total number of non-firings of a cylinder of the engine over a set period of time during a combustion cycle are obtained.
S350: the misfire rate is determined based on the total number of firings and the total number of non-firings.
S360: the misfire rate and the set value are compared in magnitude, and when the misfire rate is greater than the set value, S370 is performed. If the misfire rate is less than or equal to the set value, the routine returns to S340.
S370: the cylinder is deactivated and the fuel supply to the cylinder is stopped.
S380: and sending out a warning through the warning device.
Optionally, S390 to S410 after S380 are further included.
S390: the real-time temperature of the three-way catalyst is collected.
The real-time temperature of the three-way catalyst may be collected by a temperature sensor disposed in the three-way catalyst.
S400: and comparing the real-time temperature with the set temperature. When the real-time temperature is less than or equal to the set temperature, S401 is executed; if the real-time temperature is greater than the set temperature, S390 is re-executed. .
The set temperature can be set according to the requirement, for example, the set temperature can be 600 ℃ to 650 ℃.
S401: the cylinder is refueled after N combustion cycles.
Example four
As shown in fig. 4, a three-way catalyst protector according to a fourth embodiment of the present invention is capable of performing the three-way catalyst protection method according to the first embodiment, and specifically, the three-way catalyst protector includes:
a parameter acquisition module 410 is configured to acquire a total number of firings and a total number of non-firings of a cylinder of the engine over a set period of time during a combustion cycle.
A misfire rate determination module 420 determines a misfire rate based on the total number of firings and the total number of non-firings.
A misfire rate comparison module 430 compares the misfire rate to a set point.
An execution module 440 deactivates a cylinder when the misfire rate is greater than a set point.
According to the three-way catalyst protector, the total times of ignition and the total times of non-ignition in a set time period in the combustion cycle process of a cylinder of an engine are obtained through a parameter obtaining module 410, and a misfire rate is determined through a misfire rate determining module 420 based on the total times of ignition and the total times of non-ignition; comparing the misfire rate to a set point by the misfire rate comparison module 430; when the misfire rate is larger than a set value, the execution module 440 is used for deactivating the cylinder, so that the temperature of the three-way catalyst is guaranteed not to exceed the threshold temperature at which the three-way catalyst can normally work, the three-way catalyst is protected, and the three-way catalyst is prevented from being damaged due to overheating.
Optionally, the three-way catalyst protector further comprises a temperature acquisition module and a temperature comparison module. The temperature acquisition module is used for acquiring the real-time temperature of the three-way catalyst after the cylinder is broken; the temperature comparison module is used for comparing the real-time temperature with the set temperature, and the execution module 440 is further used for re-supplying fuel to the cylinder after N combustion cycles when the real-time temperature is less than or equal to the set temperature, so that negative effects such as shaking of the engine caused by cylinder failure can be avoided on the premise of ensuring normal operation of the three-way catalyst.
Optionally, the three-way catalyst protector further comprises:
and the working condition acquisition module is used for acquiring the real-time working condition of the engine.
And the set value determining unit is used for determining the set value according to the real-time working condition. Specifically, the set value determining unit is configured to input the real-time operating condition to the operating condition-set value correspondence map, and output the set value from the operating condition-set value correspondence map.
The three-way catalyst protector provided by the fourth embodiment of the invention is used for executing the three-way catalyst protection method and has corresponding functions and beneficial effects.
EXAMPLE five
As shown in fig. 5, a fifth embodiment of the present invention provides a vehicle, which is characterized by comprising an engine 510, a three-way catalyst 520, an ignition device 530, a controller 540, a sensor 550, and a control valve 560. The engine 510, three-way catalyst 520, ignition 530, controller 540, sensor 550, and control valve 560 may be connected by a bus or other means. The three-way catalyst 520 is disposed at an exhaust gas discharge pipe of the engine 510; the ignition device 530 is used to ignite fuel in the cylinders of the engine 510. Sensor 550 is used to collect the total number of misfires of the ignition device 530 during a set period of time during the combustion cycle for the cylinder and to send the total number of misfires and the total number of firings to the controller 540. The control valve 560 is used to close the fuel supply line that supplies fuel to the cylinder when the misfire rate is greater than a set value.
The memory, which is a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to a three-way catalyst protection method in an embodiment of the present invention. The controller 540 executes various functional applications and data processing of the vehicle by executing software programs, instructions, and modules stored in the memory, that is, implements the three-way catalyst protection method of the above-described embodiment.
The memory mainly comprises a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory may further include memory located remotely from the controller 540, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Optionally, the engine 510 is a natural gas engine. Accordingly, the fuel supplied to the cylinders is natural gas. Of course, in other embodiments, the engine 510 may also be a diesel engine, and accordingly, the fuel supplied to the cylinders is diesel.
The vehicle provided by the fifth embodiment of the invention and the three-way catalyst protection method provided by the foregoing embodiment belong to the same inventive concept, and the technical details that are not described in detail in the present embodiment can be referred to the foregoing embodiment, and the present embodiment has the same beneficial effects as the execution of the three-way catalyst protection method.
EXAMPLE six
The sixth embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the computer program, when executed by a controller, implements the three-way catalyst protection method according to the foregoing embodiment of the present invention.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the operations in the three-way catalyst protection method described above, and may also perform the related operations in the three-way catalyst protection method provided by the embodiments of the present invention, and has the corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the three-way catalyst protection method according to the embodiments of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A three-way catalyst protection method, comprising:
acquiring the total number of times of ignition and the total number of times of non-ignition in a set time period in the combustion cycle process of a cylinder of an engine;
determining a misfire rate based on the total number of firings and the total number of non-firings;
when the misfire rate is greater than a set value;
and deactivating the cylinder to stop fuel supply to the cylinder.
2. The three-way catalyst protection method according to claim 1, characterized by collecting the real-time temperature of the three-way catalyst after the cylinder is deactivated;
when the real-time temperature is less than or equal to the set temperature;
the cylinder is refueled after N combustion cycles.
3. The three-way catalyst protection method according to claim 1, characterized by collecting the real-time temperature of the three-way catalyst after the cylinder is deactivated;
when the real-time temperature is greater than or equal to the set temperature;
keeping the cylinder deactivated and until the engine stalls.
4. The three-way catalyst protection method according to claim 1, characterized in that after the cylinder is deactivated, a warning is given by a warning device.
5. The three-way catalyst guard method according to claim 1, further comprising, prior to obtaining the misfire rate of the cylinder of the engine:
acquiring the real-time working condition of an engine;
acquiring a corresponding relation graph of working conditions and set values;
and inputting the real-time working condition into the corresponding relation graph and outputting the set value.
6. A three-way catalyst protector, comprising:
the device comprises a parameter acquisition module, a parameter acquisition module and a parameter calculation module, wherein the parameter acquisition module is used for acquiring the total times of ignition and the total times of non-ignition of a cylinder of an engine in a set time period in the combustion cycle process;
a misfire rate determination module to determine a misfire rate based on the total number of firings and the total number of non-firings;
the misfire rate comparison module is used for comparing the misfire rate with a set value;
and the execution module is used for cutting off the cylinder when the misfire rate is greater than a set value.
7. The three-way catalyst protector as recited in claim 6, further comprising:
the temperature acquisition module is used for acquiring the real-time temperature of the three-way catalyst after the cylinder is broken;
and the execution module is also used for re-supplying fuel to the cylinder after N combustion cycles when the real-time temperature is less than or equal to the set temperature.
8. A vehicle, characterized by comprising:
an engine;
the three-way catalyst is arranged on an exhaust gas discharge pipe of the engine;
an ignition device for igniting fuel in a cylinder of the engine;
a controller;
the sensor is used for acquiring the total times of non-ignition and the total ignition times of the ignition device in a set time period in the combustion cycle process of the cylinder and sending the total times of non-ignition and the total ignition times to the controller;
a control valve for closing a fuel supply line that supplies fuel to the cylinder when the misfire rate is greater than a set value;
a memory for storing one or more programs;
the one or more programs, when executed by the controller, cause the controller to control a vehicle to implement the three-way catalyst guard method of any one of claims 1-5.
9. The vehicle of claim 8, characterized in that the engine is a natural gas engine.
10. A storage medium on which a computer program is stored, characterized in that the computer program, when executed by a controller, implements the three-way catalyst prevention method according to any one of claims 1 to 5.
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| CN202111030859.3A CN113586269A (en) | 2021-09-03 | 2021-09-03 | Three-way catalyst protection method and device, vehicle and storage medium |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837234A1 (en) * | 1996-10-15 | 1998-04-22 | Ford Global Technologies, Inc. | Method and system for estimating a midbed temperature of a catalytic converter |
| US20050193986A1 (en) * | 2004-03-05 | 2005-09-08 | Cullen Michael J. | Engine system and fuel vapor purging system with cylinder deactivation |
| CN102374094A (en) * | 2010-08-20 | 2012-03-14 | 阿尔特(中国)汽车技术有限公司 | Engine fire fault diagnosis method |
| CN103133162A (en) * | 2011-12-02 | 2013-06-05 | 福特环球技术公司 | Method and system for pre-ignition control |
| CN104213978A (en) * | 2013-05-31 | 2014-12-17 | 福特环球技术公司 | Methods and systems for cylinder bank misfire detection and reactivation |
| KR20180062043A (en) * | 2016-11-30 | 2018-06-08 | 현대자동차주식회사 | Method for preventing damage of catalyst caused by misfire |
-
2021
- 2021-09-03 CN CN202111030859.3A patent/CN113586269A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837234A1 (en) * | 1996-10-15 | 1998-04-22 | Ford Global Technologies, Inc. | Method and system for estimating a midbed temperature of a catalytic converter |
| US20050193986A1 (en) * | 2004-03-05 | 2005-09-08 | Cullen Michael J. | Engine system and fuel vapor purging system with cylinder deactivation |
| CN102374094A (en) * | 2010-08-20 | 2012-03-14 | 阿尔特(中国)汽车技术有限公司 | Engine fire fault diagnosis method |
| CN103133162A (en) * | 2011-12-02 | 2013-06-05 | 福特环球技术公司 | Method and system for pre-ignition control |
| CN104213978A (en) * | 2013-05-31 | 2014-12-17 | 福特环球技术公司 | Methods and systems for cylinder bank misfire detection and reactivation |
| KR20180062043A (en) * | 2016-11-30 | 2018-06-08 | 현대자동차주식회사 | Method for preventing damage of catalyst caused by misfire |
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