CN115962059B - Engine control method and device - Google Patents
Engine control method and device Download PDFInfo
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- CN115962059B CN115962059B CN202211712843.5A CN202211712843A CN115962059B CN 115962059 B CN115962059 B CN 115962059B CN 202211712843 A CN202211712843 A CN 202211712843A CN 115962059 B CN115962059 B CN 115962059B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The application discloses an engine control method and a device, which relate to the technical field of engines, and are applied to a vehicle comprising a multi-stage three-way catalyst TWC, wherein the multi-stage TWC at least comprises a first-stage TWC and a second-stage TWC, the first-stage TWC processes tail gas of the vehicle in preference to the second TWC, and the method comprises the following steps: acquiring the air inlet temperature of the second-stage TWC; if the air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold, controlling the fuel enrichment process with a first target value higher than a standard value; and if the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process according to a second target value lower than the standard value. Thus, the method can reduce fuel consumption.
Description
Technical Field
The application relates to the technical field of engines, in particular to an engine control method and an engine control device.
Background
In order to further reduce pollutants emitted by a vehicle, the vehicle is equipped with two-stage three-way catalysts (TWCs), namely a first-stage TWC and a second-stage TWC, where the first-stage TWC is mainly used for purifying exhaust gas of an engine to a certain extent, removing pollutants such as nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO) and the like in the exhaust gas, specifically, oxidizing the pollutants to obtain non-pollutants, and then discharging the non-pollutants.
In the process of purifying the tail gas by the first-stage TWC, the process of calibrating the required oxygen amount and the fuel enrichment amount in advance is needed, so that the tail gas after the treatment of the first-stage TWC can be effectively purified.
However, as the TWC ages, the calibration data needs to be continuously updated, that is, the calibration data corresponding to each aging degree needs to be calibrated, which requires a large number of aging samples and consumes a large amount of time and cost, and is difficult to realize in engineering.
It can be seen that as the TWC ages, the amount or duration of fuel enrichment achieved by the new TWC device calibration will no longer apply, and thus will increase fuel consumption.
Disclosure of Invention
The application provides an engine control method and device, which can reduce fuel consumption.
In order to achieve the above purpose, the application adopts the following technical scheme:
In a first aspect, the present application provides an engine control method for use with a vehicle including a multi-stage three-way catalyst TWC including at least a first-stage TWC and a second-stage TWC, the first-stage TWC treating exhaust gas of the vehicle in preference to the second TWC, the method comprising:
Acquiring the air inlet temperature of the second-stage TWC;
If the air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold, controlling the fuel enrichment process with a first target value higher than a standard value;
and if the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process according to a second target value lower than the standard value.
Optionally, the method further comprises:
Acquiring the amount of ammonia discharged by the TWC of the first stage;
And if the ammonia amount discharged by the first-stage TWC is greater than or equal to a preset ammonia threshold value, controlling the fuel enrichment process according to a third target value lower than the second target value.
Optionally, the method further comprises:
Acquiring the amount of ammonia discharged by the TWC of the first stage;
according to a preset corresponding relation between the ammonia amount and a target value, a fourth target value corresponding to the ammonia amount discharged by the first-stage TWC is obtained;
and controlling the fuel enrichment process at the fourth target value.
Optionally, the controlling the fuel enrichment process includes:
controlling the enrichment amount of the fuel; and/or the number of the groups of groups,
The duration of the enrichment of the fuel is controlled.
Optionally, the fuel comprises fuel oil or fuel gas.
In a second aspect, the present application provides an engine control apparatus for use in a vehicle including a multi-stage TWC including at least a first-stage TWC and a second-stage TWC, the first-stage TWC treating exhaust gas of the vehicle in preference to the second TWC, the apparatus comprising:
an acquisition module for acquiring an air inlet temperature of the second-stage TWC;
the control module is used for controlling the fuel enrichment process with a first target value higher than a standard value if the air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold value; and if the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process according to a second target value lower than the standard value.
Optionally, the obtaining module is further configured to obtain an amount of ammonia gas emitted by the first-stage TWC;
The control module is further configured to control a fuel enrichment process with a third target value that is lower than the second target value if the amount of ammonia gas emitted by the first-stage TWC is greater than or equal to a preset ammonia gas threshold.
Optionally, the obtaining module is further configured to obtain an ammonia amount discharged by the first-stage TWC, and obtain a fourth target value corresponding to the ammonia amount discharged by the first-stage TWC according to a preset correspondence between the ammonia amount and the target value;
the control module is further configured to control a fuel enrichment process at the fourth target value.
Optionally, the control module is specifically configured to control an enrichment amount of the fuel; and/or controlling the duration of the enrichment of the fuel.
Optionally, the fuel comprises fuel oil or fuel gas.
In a third aspect, the present application provides an electronic device comprising a processor and a memory; wherein one or more computer programs are stored in the memory, the one or more computer programs comprising instructions; the instructions, when executed by the processor, cause the electronic device to perform any one of the possible methods of the first aspect described above.
In a fourth aspect, the present application provides a computer storage medium comprising computer instructions which, when run on an electronic device, performs a method as any one of the above-described possible methods of the first aspect.
In a fifth aspect, the present application provides a computer program product for performing any one of the possible methods of the first aspect above when the computer program product is run on a computer.
The application has the following beneficial effects:
In the application, the vehicle comprises a plurality of stages of TWCs, wherein the first stage TWC is connected with the second stage TWC, the first stage TWC processes the tail gas of the vehicle in preference to the second stage TWC, and the second stage TWC processes the tail gas processed by the first stage TWC again. After the engine has been turned on in a fuel cut off mode (FSO), an Electronic Control Unit (ECU) may enrich the fuel injection of the engine so that the first stage TWC is fully operative to treat pollutants in the exhaust gas. However, when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the second-stage TWC cannot oxidize ammonia (NH 3) generated by the fuel enrichment, so that when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the fuel enrichment process is controlled at a target value lower than a standard value, so that unnecessary fuel consumption is reduced, and meanwhile, the emission of ammonia (NH 3) is reduced; when the air inlet temperature of the second-stage TWC reaches a preset temperature threshold, the fuel enrichment process is controlled according to the target value so as to oxidize ammonia (NH 3) generated by the first-stage TWC and reduce the emission of pollutants.
It should be appreciated that the description of technical features, aspects, benefits or similar language in the present application does not imply that all of the features and advantages may be realized with any single embodiment. Conversely, it should be understood that the description of features or advantages is intended to include, in at least one embodiment, the particular features, aspects, or advantages. Therefore, the description of technical features, technical solutions or advantageous effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and advantageous effects described in the present embodiment may also be combined in any appropriate manner. Those of skill in the art will appreciate that an embodiment may be implemented without one or more particular features, aspects, or benefits of a particular embodiment. In other embodiments, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments.
Drawings
FIG. 1 is a schematic diagram of a two-stage TWC according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another two-stage TWC according to an embodiment of the present application;
FIG. 3 is a flow chart of an engine control method according to an embodiment of the present application;
FIG. 4 is a flow chart of yet another engine control method provided by an embodiment of the present disclosure;
Fig. 5 is a schematic diagram of an engine control device according to an embodiment of the present application.
Detailed Description
The terms first, second, third and the like in the description and in the claims and in the drawings are used for distinguishing between different objects and not for limiting the specified order.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
For clarity and conciseness in the description of the following embodiments, a brief description of the related art will be given first:
TWCs (three-way catalysts) are used in devices for purifying engine exhaust gases, effectively removing nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO) from the exhaust gases.
Oxygen storage means that a certain amount of oxygen can be stored in the TWC catalyst for release in an oxygen-deficient or oxygen-free environment for reaction with pollutants in the exhaust gas to reduce the content of the pollutants.
Fuel Shut Off (FSO) is a process in which the engine stops injecting Fuel gas, and the intake air of the engine is air; when the engine exits the FSO mode, the air inlet of the engine is restored to be the mixed gas of fuel gas, air and waste gas, and the engine enters a fuel gas injection partial-concentration state for consuming oxygen stored by the three-way catalyst.
In order to further reduce pollutants emitted from a vehicle, the vehicle may be equipped with a two-stage TWC, as shown in fig. 1, which is a schematic structural diagram of the two-stage TWC according to an embodiment of the present application.
The air inlet of the first-stage TWC 101 is used for receiving exhaust gas discharged by the engine, the air outlet of the first-stage TWC 101 is connected with the air inlet of the second-stage TWC 103 through a pipeline 102, and the air outlet of the second-stage TWC is used for discharging the exhaust gas generated by the engine.
The first-stage TWC 101 is mainly used for purifying the tail gas of the engine to a certain extent and removing pollutants such as NOx, HC, CO and the like in the tail gas.
In the conventional scheme, the required oxygen amount and the fuel enrichment process need to be calibrated in advance to ensure that the tail gas treated by the first-stage TWC 101 is effectively purified.
However, as the TWC ages, the calibration data needs to be continuously updated, that is, the calibration data corresponding to each aging degree needs to be calibrated, which requires a large number of aging samples and consumes a large amount of time and cost, and is difficult to realize in engineering.
It can be seen that as the TWC ages, the amount or duration of fuel enrichment achieved by the new TWC device calibration will no longer apply, and thus will increase fuel consumption.
In view of this, the embodiment of the application provides an engine control method, which can be applied to an electronic control unit ECU, and controls a gas enrichment process based on the temperature of the air inlet of the second-stage TWC 103, and adjusts the tail gas with different temperatures for emphasis control, thereby reducing the fuel consumption while reducing the pollutants. Specifically, the vehicle may include a vehicle having a multi-stage TWC including at least a first stage TWC 101 and a second stage TWC 103, the first stage TWC 101 treating exhaust of the vehicle in preference to the second TWC, the method comprising: acquiring the air inlet temperature of the second-stage TWC 103; if the intake temperature of the second stage TWC 103 is greater than or equal to the preset temperature threshold, controlling the fuel enrichment process with a first target value that is higher than the standard value; if the intake temperature of the second stage TWC 103 is less than the preset temperature threshold, the fuel enrichment process is controlled at a second target value that is less than the standard value.
Thus, in the method, the vehicle includes a multi-stage TWC wherein the first stage TWC 101 is coupled to the second stage TWC 103, the first stage TWC 101 treats the exhaust of the vehicle prior to the second stage TWC 103, and the second stage TWC 103 treats the exhaust again after the first stage TWC 101 treatment. After the engine has been turned off in a fuel-on-gas shut-off mode (FSO), an Electronic Control Unit (ECU) may enrich the fuel injection amount of the engine so that the first stage TWC 101 is fully disposed of the pollutants in the exhaust gas. However, when the inlet temperature of the second-stage TWC 103 does not reach the preset temperature threshold, the second-stage TWC 103 will not oxidize ammonia (NH 3) generated by the fuel enrichment, and therefore, when the inlet temperature of the second-stage TWC 103 does not reach the preset temperature threshold, the fuel enrichment process is controlled at a target value lower than the standard value, so as to reduce unnecessary fuel consumption and reduce the emission of ammonia (NH 3); when the intake temperature of the second-stage TWC 103 reaches a preset temperature threshold, the fuel enrichment process is controlled at a target value so as to oxidize ammonia (NH 3) generated by the first-stage TWC 101 and reduce the emission of pollutants.
As shown in FIG. 2, a schematic diagram of another two-stage TWC according to an embodiment of the present application is shown.
Exhaust gas discharged from the engine firstly passes through the front oxygen sensor 104 and then enters the first-stage TWC 101, and then passes through the rear oxygen sensor 105, the ammonia sensor 106, the temperature sensor 107 and the air inlet of the second-stage TWC 103, and after the second-stage TWC 103 carries out subsequent treatment on the exhaust gas, the exhaust gas is discharged from the air outlet of the second-stage TWC 103. Wherein a post oxygen sensor 105, an ammonia sensor 106, a temperature sensor 107 are at the channel 102 between the first stage TWC 101 and the second stage TWC 103. The front oxygen sensor 104, the rear oxygen sensor 105, the ammonia sensor 106, and the temperature sensor 107 are connected to an electronic control unit ECU 108, and the ECU 108 can receive and process data acquired by the respective sensors.
It should be noted that the above description is given by way of example only of a 2-stage TWC, and of course, in some embodiments, the vehicle may include more stages of TWCs, such as 3 stages, 4 stages, and so on.
The vehicle to which the method provided by the embodiment of the present application is applied is described above, and the method provided by the embodiment of the present application is described below.
As shown in fig. 3, the present application provides a flowchart of an engine control method, which includes:
S301, the ECU acquires the air inlet temperature of the TWC of the second stage.
In some embodiments, a temperature sensor may be disposed near the air inlet of the second stage TWC, as shown in FIG. 2 above, and a temperature sensor 107 may be disposed in the channel 102 between the first stage TWC 101 and the second stage TWC 103. The temperature sensor 107 may collect temperature data and transmit it to the ECU 108, and the ECU 108 obtains the intake port temperature of the second-stage TWC based on the temperature data collected by the temperature sensor 107.
S302, the ECU judges whether the air inlet temperature of the second-stage TWC is smaller than a preset temperature threshold, if yes, S303 is executed, and if not, S304 is executed.
The preset temperature threshold value can be a preset value, and can be obtained based on experiments or experience, and is different in general and different in different vehicle types.
S303, the ECU controls the fuel enrichment process at a second target value lower than the standard value.
The standard value refers to a value corresponding to when the ECU does not intervene in the gas enrichment process when the vehicle exits the FSO.
The second target value is a value lower than a standard value, and after the ECU determines that the air inlet temperature of the second-stage TWC is less than the preset temperature threshold, the ECU controls the fuel enrichment process with the second target value lower than the standard value to weaken the fuel enrichment process, for example, the fuel enrichment amount may be reduced, the fuel enrichment duration may be reduced, or both the fuel enrichment amount and the fuel enrichment duration may be reduced. Wherein, the fuel can be fuel oil or gas, and the gas can be natural gas or hydrogen, etc.
S304, the ECU controls the fuel enrichment process at a first target value higher than a standard value.
The first target value is a value higher than a standard value, and after the ECU determines that the air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold, the ECU controls the fuel enrichment process with the first target value higher than the standard value to enhance the fuel enrichment process, for example, to increase the fuel enrichment amount, to extend the fuel enrichment duration, or to increase the fuel enrichment amount and to extend the enrichment duration at the same time.
It can be seen that in the present application, the vehicle includes a multi-stage TWC wherein the first stage TWC is coupled to a second stage TWC, the first stage TWC treating the exhaust of the vehicle prior to the second stage TWC, and the second stage TWC treating the exhaust again after the first stage TWC treatment. After the engine has been turned on in a fuel cut off mode (FSO), an Electronic Control Unit (ECU) may enrich the fuel injection of the engine so that the first stage TWC is fully operative to treat pollutants in the exhaust gas. However, when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the second-stage TWC cannot oxidize ammonia (NH 3) generated by the fuel enrichment, so that when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the fuel enrichment process is controlled at a target value lower than a standard value, so that unnecessary fuel consumption is reduced, and meanwhile, the emission of ammonia (NH 3) is reduced; when the air inlet temperature of the second-stage TWC reaches a preset temperature threshold, the fuel enrichment process is controlled according to the target value so as to oxidize ammonia (NH 3) generated by the first-stage TWC and reduce the emission of pollutants.
As shown in fig. 4, the present application provides a flowchart of another engine control method, which includes:
S401, the ECU acquires the air inlet temperature of the TWC of the second stage.
S402, the ECU judges whether the air inlet temperature of the second-stage TWC is smaller than a preset temperature threshold, if yes, S403 is executed, and if not, S406 is executed.
S403, the ECU controls the fuel enrichment process at a second target value lower than the standard value.
S404, the ECU acquires the amount of ammonia discharged by the TWC of the first stage.
In some embodiments, the ECU may also receive ammonia data collected by the ammonia sensor 106 and then based on the ammonia data, derive an amount of ammonia that the first stage TWC has been purged for a period of time.
S405, if the ammonia amount discharged by the TWC of the first stage is greater than or equal to the preset ammonia threshold value, the ECU controls the fuel enrichment process according to a third target value lower than the second target value.
If the amount of ammonia emitted by the first stage TWC is greater than or equal to the preset ammonia threshold, the ECU controls the fuel heating process at a third target value that is lower than the second target value.
The third target value is a value lower than the second target value, and after the ECU determines that the ammonia amount discharged by the TWC at the first stage is greater than or equal to the preset ammonia threshold, the ECU controls the fuel enrichment process with the third target value lower than the second target value to weaken the fuel enrichment process, for example, the fuel enrichment amount may be reduced, the fuel enrichment duration may be reduced, or both the fuel enrichment amount and the enrichment duration may be reduced.
S406, the ECU controls the fuel enrichment process at a first target value higher than a standard value.
S407, the ECU acquires the amount of ammonia discharged by the TWC of the first stage.
In some embodiments, the ECU may also receive ammonia data collected by the ammonia sensor 106 and then based on the ammonia data, derive an amount of ammonia that the first stage TWC has been purged for a period of time.
S408, the ECU obtains a fourth target value corresponding to the ammonia gas amount discharged by the first-stage TWC according to the preset corresponding relation between the ammonia gas amount and the target value.
In some embodiments, a correspondence between the ammonia amount and the target value may be preset, different ammonia amounts correspond to different target values, and then, after the ECU obtains the ammonia amount discharged by the first-stage TWC, a fourth target value corresponding to the ammonia amount discharged by the first-stage TWC is obtained based on the correspondence.
S409, the ECU controls the fuel enrichment process at the fourth target value.
The specific control is too long and similar to the above embodiment, and will not be repeated here.
Based on the above description, when the air intake temperature of the second-stage TWC is higher, for example, the air intake temperature of the second-stage TWC is higher than a preset temperature threshold, the ECU calculates the amount of ammonia discharged from the first-stage TWC after each time the engine exits the FSO, specifically, by integrating for a certain period of time, and then compares the amount of ammonia discharged from the first-stage TWC with a preset maximum value of ammonia discharge, and if the amount of ammonia discharged is greater than the preset maximum value of ammonia discharge, the fuel enrichment amount or the enrichment duration in the next cycle is reduced to avoid the situation that a large amount of NH3 is generated due to over-enrichment of fuel and the second-stage TWC cannot completely oxidize NH 3. When the air inlet temperature of the second-stage TWC is lower, for example, the air inlet temperature of the second-stage TWC is lower than a preset temperature threshold, the ECU calculates the amount of ammonia discharged by the first-stage TWC after the engine exits the FSO each time, specifically, the amount of ammonia can be obtained by integration for a certain period of time, and then, based on the preset correspondence between the amount of ammonia and a target value, a fourth target value is determined, which is generally smaller than the second target value, so that the fuel enrichment process is weakened, the fuel consumption is reduced, and the pollutants generated by the engine are reduced.
The embodiment of the application also provides an engine control device, as shown in fig. 5, which is a schematic diagram of the engine control device provided in the embodiment of the application, the device may be applied to a vehicle including a multi-stage TWC, where the multi-stage TWC includes at least a first-stage TWC and a second-stage TWC, and the first-stage TWC processes exhaust gas of the vehicle in preference to the second TWC, and the device includes:
an acquisition module 501 configured to acquire an intake temperature of the second-stage TWC;
A control module 502, configured to control a fuel enrichment process with a first target value higher than a standard value if an air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold; and if the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process according to a second target value lower than the standard value.
Optionally, the obtaining module 501 is further configured to obtain an amount of ammonia gas emitted by the first stage TWC;
the control module 502 is further configured to control the fuel enrichment process with a third target value that is lower than the second target value if the amount of ammonia gas emitted by the first stage TWC is greater than or equal to a preset ammonia threshold.
Optionally, the obtaining module 501 is further configured to obtain an amount of ammonia discharged by the first-stage TWC, and obtain a fourth target value corresponding to the amount of ammonia discharged by the first-stage TWC according to a preset correspondence between the amount of ammonia and the target value;
the control module 502 is further configured to control a fuel enrichment process at the fourth target value.
Optionally, the control module 502 is specifically configured to control an enrichment amount of the fuel; and/or controlling the duration of the enrichment of the fuel.
Optionally, the fuel comprises fuel oil or fuel gas.
In the application, the device can be used for a vehicle comprising a plurality of stages of TWCs, wherein the first stage TWC is connected with the second stage TWC, the first stage TWC is used for treating the tail gas of the vehicle in preference to the second stage TWC, and the second stage TWC is used for treating the tail gas treated by the first stage TWC again. After the engine has been in a fuel-out-of-gas (FSO) mode, the device may enrich the fuel injection of the engine so that the first TWC stage is fully treated for pollutants in the exhaust. However, when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the second-stage TWC cannot oxidize ammonia (NH 3) generated by the fuel enrichment, so that when the air inlet temperature of the second-stage TWC does not reach the preset temperature threshold, the fuel enrichment process is controlled at a target value lower than a standard value, so that unnecessary fuel consumption is reduced, and meanwhile, the emission of ammonia (NH 3) is reduced; when the air inlet temperature of the second-stage TWC reaches a preset temperature threshold, the fuel enrichment process is controlled according to the target value so as to oxidize ammonia (NH 3) generated by the first-stage TWC and reduce the emission of pollutants.
The embodiment of the application also provides electronic equipment, which comprises a processor and a memory; wherein one or more computer programs are stored in the memory, the one or more computer programs comprising instructions; the instructions, when executed by the processor, cause the electronic device to perform any one of the possible methods of the first aspect described above.
Embodiments of the present application also provide a computer storage medium comprising computer instructions which, when run on an electronic device, perform a method as any one of the possible methods of the first aspect described above.
Embodiments of the present application also provide a computer program product for performing any one of the possible methods of the first aspect described above when the computer program product is run on a computer.
The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. An engine control method, characterized by being applied to a vehicle including a multi-stage three-way catalyst TWC including at least a first-stage TWC and a second-stage TWC, the first-stage TWC treating exhaust gas of the vehicle in preference to the second-stage TWC, the method comprising:
Acquiring the air inlet temperature of the second-stage TWC;
if the temperature of the air inlet of the second-stage TWC is greater than or equal to a preset temperature threshold, controlling the fuel enrichment process with a first target value higher than a standard value, and acquiring the amount of ammonia discharged by the first-stage TWC; according to a preset corresponding relation between the ammonia amount and a target value, a fourth target value corresponding to the ammonia amount discharged by the first-stage TWC is obtained; controlling a fuel enrichment process at the fourth target value;
If the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process with a second target value lower than the standard value, and acquiring the ammonia amount discharged by the first-stage TWC; and if the ammonia amount discharged by the first-stage TWC is greater than or equal to a preset ammonia threshold value, controlling the fuel enrichment process according to a third target value lower than the second target value.
2. The method of claim 1, wherein said controlling a fuel enrichment process comprises:
controlling the enrichment amount of the fuel; and/or the number of the groups of groups,
The duration of the enrichment of the fuel is controlled.
3. The method of claim 1 or 2, wherein the fuel comprises fuel oil or gas.
4. An engine control device for a vehicle including a multi-stage TWC including at least a first-stage TWC and a second-stage TWC, the first-stage TWC treating exhaust gas of the vehicle in preference to the second-stage TWC, the device comprising:
an acquisition module for acquiring an air inlet temperature of the second-stage TWC;
The control module is used for controlling the fuel enrichment process with a first target value higher than a standard value if the air inlet temperature of the second-stage TWC is greater than or equal to a preset temperature threshold value; if the air inlet temperature of the second-stage TWC is smaller than the preset temperature threshold, controlling the fuel enrichment process according to a second target value lower than the standard value;
Wherein, after the control module performs the step of controlling the fuel enrichment process at a second target value lower than the standard value, the obtaining module is further configured to obtain an amount of ammonia gas emitted by the first-stage TWC; the control module is further configured to control a fuel enrichment process with a third target value lower than the second target value if the amount of ammonia gas emitted by the first-stage TWC is greater than or equal to a preset ammonia gas threshold;
After the control module executes the step of controlling the fuel enrichment process with a first target value higher than a standard value, the obtaining module is further configured to obtain an ammonia amount discharged by the first-stage TWC, and obtain a fourth target value corresponding to the ammonia amount discharged by the first-stage TWC according to a preset correspondence between the ammonia amount and the target value; the control module is further configured to control a fuel enrichment process at the fourth target value.
5. The apparatus according to claim 4, wherein the control module is configured to control an amount of fuel enrichment; and/or controlling the duration of the enrichment of the fuel.
6. The apparatus of claim 4, wherein the fuel comprises fuel oil or gas.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10697340B1 (en) * | 2019-01-31 | 2020-06-30 | Hyundai Motor Company | After treatment system and after treatment method for lean-burn engine |
| JP2021173212A (en) * | 2020-04-24 | 2021-11-01 | 株式会社Soken | Exhaust emission control system for hydrogen fuel engine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3925617B2 (en) * | 2001-10-02 | 2007-06-06 | 三菱自動車工業株式会社 | Exhaust gas purification device for internal combustion engine |
| JP5573703B2 (en) * | 2011-01-26 | 2014-08-20 | 三菱自動車工業株式会社 | Exhaust purification system |
| US9816417B2 (en) * | 2016-04-02 | 2017-11-14 | II Dorian Francis Corliss | Method for treating an exhaust gas |
| US10030557B2 (en) * | 2016-11-14 | 2018-07-24 | Ford Global Technologies, Llc | Exhaust passage having first and second catalysts |
| US10808588B2 (en) * | 2019-01-31 | 2020-10-20 | Hyundai Motor Company | After treatment system and after treatment method for lean-burn engine |
| CN114439633A (en) * | 2020-11-06 | 2022-05-06 | 赛格威科技有限公司 | Control method, device and equipment of vehicle engine and storage medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10697340B1 (en) * | 2019-01-31 | 2020-06-30 | Hyundai Motor Company | After treatment system and after treatment method for lean-burn engine |
| JP2021173212A (en) * | 2020-04-24 | 2021-11-01 | 株式会社Soken | Exhaust emission control system for hydrogen fuel engine |
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