CN114233490B - Method and device for determining gas injection quantity and related equipment - Google Patents
Method and device for determining gas injection quantity and related equipment Download PDFInfo
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- CN114233490B CN114233490B CN202111584478.XA CN202111584478A CN114233490B CN 114233490 B CN114233490 B CN 114233490B CN 202111584478 A CN202111584478 A CN 202111584478A CN 114233490 B CN114233490 B CN 114233490B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Combustion & Propulsion (AREA)
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses a method, a device and related equipment for determining gas injection quantity, comprising the following steps: and acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine enters the FSO mode, and also acquiring a second post-oxygen voltage value, and the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode, so that the ECU determines the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value, and calculates the gas injection amount of the engine according to the oxygen storage amount of the multi-catalyst. The actual oxygen storage amount of the multi-element catalyst can be calculated according to the first post-oxygen voltage value and the second post-oxygen voltage value, so that the finally determined fuel gas injection amount of the engine can generally enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio, the conversion efficiency of the multi-element catalyst can be improved, and the purification effect of the multi-element catalyst is ensured to be influenced as much as possible.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a method and an apparatus for determining a fuel gas injection amount, and a related device.
Background
Multiple catalysts, such as three-way catalysts, are among the most important off-board purification devices installed in the exhaust system of a vehicle. When the high-temperature vehicle tail gas passes through the multi-element catalyst, the purifying agent in the multi-element catalyst can enhance the activity of harmful gases such as carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxides (NOx) in the vehicle tail gas, and can be converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction,to purify the vehicle exhaust. Specifically, CO oxidizes at high temperatures to colorless, non-toxic carbon dioxide gas; oxidation of hydrocarbons to water (H) at high temperature 2 0) And carbon dioxide; NOx is reduced to nitrogen and oxygen.
Currently, when an engine of a vehicle enters a Fuel cut Off (FSO) mode, the engine stops injecting Fuel gas, and the engine intake air is pure air, and at this time, the multi-catalytic converter is in a state of storing oxygen. When the engine exits the FSO mode, the air inlet of the engine is restored to be the mixture of fuel gas, air and waste gas, and at the moment, the engine enters a fuel gas injection rich state for consuming oxygen stored by the multi-element catalyst.
However, when the engine exits the FSO mode, the fuel injection amount of the engine often makes it difficult for the multi-catalyst to reach an ideal value, resulting in lower conversion efficiency of the multi-catalyst.
Disclosure of Invention
The embodiment of the application provides a method, a device and related equipment for determining fuel gas injection quantity, so as to improve the conversion efficiency of a multi-element catalyst.
In a first aspect, an embodiment of the present application provides a method for determining a fuel gas injection amount, the method including:
acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to a multi-catalyst when an engine enters a fuel gas cut-off (FSO) mode;
acquiring a second post-oxygen voltage value, wherein the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode;
determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value;
and calculating the fuel gas injection quantity of the engine according to the oxygen storage quantity of the multi-element catalyst.
In one possible embodiment, the determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value includes:
when the first post-oxygen voltage value is not smaller than a first voltage threshold and the second post-oxygen voltage value is larger than a second voltage threshold, the oxygen storage amount of the multi-catalyst is calculated according to the time interval between a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, and the first voltage threshold is larger than the second voltage threshold.
In one possible embodiment, the determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value includes:
when the first post-oxygen voltage value is not smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, acquiring a first moment and a third moment, wherein the first moment is the moment when the engine enters the FSO mode, the third moment is the moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
and calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first time and the third time.
In one possible embodiment, the determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value includes:
when the first post-oxygen voltage value is smaller than a first voltage threshold value and the second post-oxygen voltage value is larger than a second voltage threshold value, acquiring a first moment and a second moment, wherein the first moment is the moment when the engine enters the FSO mode, the second moment is the moment when the engine exits the FSO mode, and the first voltage threshold value is larger than the second voltage threshold value;
calculating a first intake air oxygen storage amount according to the time interval between the first moment and the second moment;
and calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first post-oxygen voltage value.
In one possible embodiment, the determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value includes:
when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, acquiring a first moment and a third moment, wherein the first moment is the moment when the engine enters the FSO mode, the third moment is the moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
calculating a second intake air oxygen storage amount according to the time interval between the first time and the third time;
and calculating the oxygen storage amount of the multi-element catalyst according to the second intake oxygen storage amount and the first post-oxygen voltage value.
In a second aspect, an embodiment of the present application further provides an apparatus for determining a fuel gas injection amount, where the apparatus includes:
the first acquisition module is used for acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine enters a fuel gas cut-off (FSO) mode;
the second acquisition module is used for acquiring a second post-oxygen voltage value, wherein the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode;
the determining module is used for determining the oxygen storage amount of the multi-element catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value;
and the calculation module is used for calculating the fuel gas injection quantity of the engine according to the oxygen storage quantity of the multi-element catalyst.
In one possible implementation manner, the determining module is specifically configured to calculate, when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is greater than a second voltage threshold, an oxygen storage amount of the multi-catalyst according to a time interval between a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, where the first voltage threshold is greater than the second voltage threshold.
In one possible implementation, the determining module includes:
the first obtaining unit is configured to obtain a first time and a third time when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is not greater than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, and the third time is a time when the post-oxygen voltage value of the multi-catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first moment and the third moment.
In one possible implementation, the determining module includes:
the second obtaining unit is configured to obtain a first time and a second time when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is larger than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, the second time is a time when the engine exits the FSO mode, and the first voltage threshold is larger than the second voltage threshold;
the second calculation unit is used for calculating a first intake air oxygen storage amount according to the time interval between the first moment and the second moment;
and the third calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first post-oxygen voltage value.
In one possible implementation, the determining module includes:
the third obtaining unit is configured to obtain a first time and a third time when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, and the third time is a time when the post-oxygen voltage value of the multi-catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
a fourth calculation unit, configured to calculate a second intake air oxygen storage amount according to a time interval between the first time and the third time;
and a fifth calculation unit for calculating the oxygen storage amount of the multi-element catalyst according to the second intake air oxygen storage amount and the first post-oxygen voltage value.
In a third aspect, embodiments of the present application also provide a computing device that may include a processor and a memory:
the memory is used for storing a computer program;
the processor is configured to execute the method according to the first aspect and any implementation manner of the first aspect according to the computer program.
In a fourth aspect, an embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium is configured to store a computer program, where the computer program is configured to perform the method according to any one of the foregoing first aspect and any implementation manner of the first aspect.
In the above implementation manner of the embodiment of the present application, a first post-oxygen voltage value is obtained, where the first post-oxygen voltage value is a post-oxygen voltage value corresponding to a multi-catalyst when the engine enters an FSO mode, and a second post-oxygen voltage value is also obtained, where the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode, so that the ECU determines an oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value, and calculates a gas injection amount of the engine according to the oxygen storage amount of the multi-catalyst. Since the actual oxygen storage amount of the multi-element catalyst is calculated according to the corresponding post-oxygen voltage values when the engine enters the FSO mode and exits the FSO mode, and the gas injection amount of the engine is further calculated according to the actual oxygen storage amount instead of determining the gas injection amount of the engine according to the default value of the oxygen storage amount, the finally determined gas injection amount of the engine can generally enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio, for example, the injection amount of the engine gas can be reduced when the oxygen storage amount is smaller, so that the conversion efficiency of the multi-element catalyst can be improved, and the purification effect affecting the multi-element catalyst can be ensured as much as possible.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for those of ordinary skill in the art.
FIG. 1 is a schematic flow chart of a method for determining fuel gas injection quantity according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a device for determining fuel gas injection quantity according to an embodiment of the present application;
fig. 3 is a schematic hardware structure of a computing device according to an embodiment of the present application.
Detailed Description
Currently, when an engine of a vehicle enters a Fuel cut Off (FSO) mode, the engine stops injecting Fuel gas, and the engine intake air is pure air, and at this time, the multi-catalytic converter is in a state of storing oxygen. When the engine exits the FSO mode, the air inlet of the engine is restored to be the mixture of fuel gas, air and waste gas, and at the moment, the engine enters a fuel gas injection rich state for consuming oxygen stored by the multi-element catalyst.
In order to be able to effectively use a multiple catalyst (e.g., a three-way catalyst, etc.), it is often possible to control the air-fuel ratio of the engine to approach the stoichiometric air-fuel ratio (i.e., the air-fuel ratio of the multiple catalyst in the ideal case of efficient conversion). The air-fuel ratio is the ratio of the mass of air to the mass of fuel gas in the mixture entering the engine, and can be expressed in grams of air consumed in combustion per gram of fuel gas. However, when the engine exits FSO mode, the electronic control unit (Electronic Control Unit, ECU) typically determines the fuel injection amount at engine intake based on the oxygen storage amount (or other default value) of the multiple catalyst when full oxygen is present. However, in many practical scenarios, the multi-catalyst may not be fully charged with oxygen when the engine exits FSO mode. For example, during a shift, the engine may have a short time interval (e.g., 1 second, etc.) from entering FSO mode to exiting FSO mode, during which air entering the engine typically does not cause the multi-catalyst to be full of oxygen. At this time, the injection amount of the engine gas determined by the ECU when the engine exits the FSO mode may be too large and the air-fuel ratio of the engine cannot be made close to the stoichiometric air-fuel ratio, resulting in lower conversion efficiency of the multiple catalyst and even affecting the purifying effect of the multiple catalyst.
Based on the above, the embodiment of the application provides a method for determining the injection quantity of fuel gas, aiming at improving the conversion efficiency of a multi-element catalyst. In particular, when the engine is in the FSO mode, the ECU firstly acquires a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine enters the FSO mode, and also acquires a second post-oxygen voltage value, and the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode, so that the ECU determines the oxygen storage quantity of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value, and calculates the gas injection quantity of the engine according to the oxygen storage quantity of the multi-catalyst.
Because the ECU calculates the actual oxygen storage amount of the multi-catalyst according to the corresponding post-oxygen voltage values when the engine enters the FSO mode and exits the FSO mode respectively, and further calculates the fuel gas injection amount of the engine according to the actual oxygen storage amount instead of determining the fuel gas injection amount of the engine according to the default value of the oxygen storage amount, the fuel gas injection amount of the engine finally determined by the ECU can generally enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio, for example, when the oxygen storage amount is smaller, the ECU can reduce the injection amount of the fuel gas of the engine, and the like, so that the conversion efficiency of the multi-catalyst can be improved, and the purification effect affecting the multi-catalyst can be ensured as much as possible.
In order that the above objects, features and advantages of the present application will be more readily understood, a more particular description of various non-limiting embodiments of the application will be rendered by reference to the appended drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 shows a schematic flow chart of a method for determining a fuel gas injection amount according to an embodiment of the present application, where the method may be performed by an ECU on a vehicle, or may be performed by another controller on the vehicle. For convenience of explanation and understanding, the following description will be given by taking an example in which the ECU determines the injection amount of the engine gas. The method specifically comprises the following steps:
s101: and acquiring a first post-oxygen voltage value which is the post-oxygen voltage value corresponding to the multi-catalyst when the engine enters the FSO mode.
In this embodiment, a post-oxygen sensor may be provided in advance in the vicinity of the multi-catalyst, and a post-oxygen voltage value of the multi-catalyst may be sensed by the post-oxygen sensor, so that the oxygen storage amount (Oxygen Storage Capacity, OSC) of the multi-catalyst is determined from the post-oxygen voltage value. For example, when the post-oxygen voltage value of the multi-catalyst is greater than 1.6V (volts), characterizing that no oxygen is stored in the multi-catalyst; when the post oxygen voltage value of the multi-element catalyst is 0.5V, representing that the multi-element catalyst is full of oxygen; and when the post-oxygen voltage value of the multi-catalyst is between 0.5V and 1.6V, the multi-catalyst is characterized as storing oxygen but not being full. The oxygen storage amount of the multi-element catalyst is inversely related to the post-oxygen voltage value, because the more the oxygen storage amount is in the multi-element catalyst, the more the number of oxygen anions is, so that the presence of the oxygen anions enables the post-oxygen voltage value to be smaller.
In addition, the multi-component catalyst in this embodiment may be, for example, a three-component catalyst, and is mainly used for oxidizing and reducing harmful gases such as carbon monoxide, hydrocarbons, and nitrogen oxides in the mixed gas into harmless gases. Alternatively, the multi-component catalyst can be a quaternary catalyst, and the quaternary catalyst can be based on a ternary catalyst, so that the function of cleaning solid microparticles in the mixer is added. In the present embodiment, the specific implementation of the multi-catalyst is not limited.
When the engine enters FSO mode, such as when the vehicle is currently performing a shift process, engine intake air is typically switched from a combustible mixture to air, during which the gas input by the engine into the multi-catalyst is typically not a combustible mixture, but rather air that enters the engine. Thus, the multi-catalyst may extract oxygen (specifically, oxygen anions) from the incoming air. And, along with the increase of the oxygen storage amount of the multi-element catalyst, the rear oxygen voltage value measured by the rear oxygen sensor is also continuously reduced.
In this embodiment, when the engine enters the FSO mode, the ECU may measure a first post-oxygen voltage value corresponding to the multi-catalyst at this time through the post-oxygen sensor, and the first post-oxygen voltage value may represent an oxygen storage state of the multi-catalyst when the engine enters the FSO mode. For example, when the first post-oxygen voltage value is not less than (i.e., greater than or equal to) a first voltage threshold (e.g., 1.5V, etc.), it is indicative of no oxygen stored in the multi-catalyst, and when the first post-oxygen voltage value is less than the first voltage threshold, it is indicative of a certain amount of oxygen stored in the multi-catalyst. It will be appreciated that the multi-catalyst is typically not full of oxygen since it may have been in the process of redox reactions until now.
S102: and acquiring a second post-oxygen voltage value, wherein the first post-oxygen voltage value is the post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode.
When the engine exits the FSO mode, the ECU can determine the current stored oxygen content of the multi-catalyst by measuring a second post-oxygen voltage value corresponding to the multi-catalyst after storing oxygen for a period of time through a post-oxygen sensor. Wherein the second post-oxygen voltage value may be indicative of an oxygen storage state of the multi-catalyst when the engine exits the FSO mode. For example, when the second post-oxygen voltage value is greater than a second voltage threshold (e.g., 0.5V, etc., less than the first voltage threshold), it is indicative of oxygen not being fully stored in the multi-catalyst, and when the second post-oxygen voltage value is not greater than (i.e., less than or equal to) the second voltage threshold, it is indicative of oxygen being fully stored in the multi-catalyst.
It is noted that the gas in the multi-catalyst may also contain some oxygen that is not stored by the multi-catalyst in time or may be oxygen that the multi-catalyst is currently unable to continue to store in the gas when the engine exits the FSO mode. At this time, if the ECU directly determines the gas injection amount of the engine according to the second post-oxygen voltage value corresponding to the multi-catalyst, the actual oxygen content in the vehicle may be greater than the oxygen content corresponding to the second post-oxygen voltage value, so that when the ECU determines the gas injection amount of the engine according to only the second post-oxygen voltage value, the gas injection amount of the engine may be caused to be smaller, and further the air-fuel ratio of the engine may be made to be larger, and it may be difficult to achieve the stoichiometric air-fuel ratio. If the ECU determines the fuel injection amount of the engine directly based on the maximum oxygen storage amount of the multiple catalyst, the fuel injection amount of the engine may be excessively large, and the air-fuel ratio of the engine may be excessively small, so that it is difficult to achieve the stoichiometric air-fuel ratio. Based on this, the present embodiment may further perform step S103 to determine the actual oxygen storage amount of the multi-catalyst.
S103: and determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value.
In this embodiment, the ECU may determine the actual oxygen storage amount of the multiple catalyst in combination with the respective corresponding post-oxygen voltage values of the engine at the entry and exit of the FSO mode.
Illustratively, the present embodiment provides the following four implementations for determining the actual oxygen storage amount of the multiple catalyst:
(1) When the first post-oxygen voltage value is not less than the first voltage threshold and the second post-oxygen voltage value is greater than the second voltage threshold (which is less than the first voltage threshold), the multi-catalyst is characterized as not storing oxygen when the engine enters the FSO mode and as storing oxygen when the engine exits the FSO mode butIf not full, the ECU may obtain a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, such as by the engine recording when the engine enters and exits the FSO mode. Then, the ECU may calculate the oxygen storage amount of the multi-catalyst based on the time interval between the first time and the second time. It will be appreciated that during the time when the engine enters FSO mode, the ECU may obtain the flow rate of the air in the intake air of the engine, such as by sensing through a sensor or the ECU indicating that the engine is entering the air at a preset flow rate, etc., so that the ECU may calculate the total flow rate of the air entering in the time interval between the first time and the second time by means of mathematical integral, etc., thereby calculating the oxygen storage amount m of the multi-catalyst based on the total flow rate 1 。
(2) When the first post-oxygen voltage value is not less than the first voltage threshold and the second post-oxygen voltage value is not greater than the second voltage threshold (the second voltage value is less than the first voltage threshold), the multi-catalyst is characterized as not storing oxygen when the engine enters the FSO mode and as already storing oxygen when the engine exits the FSO mode or before exiting the FSO mode. It will be appreciated that the oxygen storage capacity of the multi-catalyst is limited and therefore, when the multi-catalyst is full of oxygen, it is difficult for the multi-catalyst to continue to store oxygen in the air flowing through the multi-catalyst. Thus, the ECU may acquire a first time when the engine enters the FSO mode and determine a third time when the multi-catalyst is full of oxygen, which may be, for example, a time when the post-oxygen voltage value of the multi-catalyst drops to a second voltage threshold value, etc., and the third time is no later than a time when the engine exits the FSO mode. Thus, the ECU can calculate the oxygen storage amount m of the multi-catalyst according to the time interval between the first time and the third time 2 Determining the oxygen storage amount m of the multi-catalyst by, for example, calculating the integral of the intake air amount of the engine over the time interval 2 Etc.
(3) When the first post-oxygen voltage value is less than the first voltage threshold and the second post-oxygen voltage value is greater than a second voltage threshold (the second voltage value is less than the first voltage threshold), characterizing the multi-catalyst in the engineOxygen is stored but not fully upon entering FSO mode and is still not fully stored upon exiting FSO mode. The ECU may acquire a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, and calculate an oxygen amount included in air entering the engine during a time interval between the first time and the second time, which is referred to as a first intake oxygen storage amount m for convenience of description 3 . Since a portion of the oxygen is already stored in the multi-catalyst when the engine enters FSO mode, the ECU can store the oxygen amount m according to the first intake air 3 And calculating the actual oxygen storage amount of the multi-element catalyst according to the first post-oxygen voltage value. In particular, the ECU may determine the oxygen storage coefficient alpha based on the first post-oxygen voltage value, thereby storing the oxygen amount m based on the first intake air 3 And a first post-oxygen voltage value, the calculated actual oxygen storage amount of the multi-catalyst can be alpha x m 3 . The correspondence between the first post-oxygen voltage value and the oxygen storage coefficient may be determined by means of an experimental test or simulation, or the like, and may be configured in the ECU in advance.
(4) When the first post-oxygen voltage value is less than the first voltage threshold and the second post-oxygen voltage value is not greater than a second voltage threshold (the second voltage value is less than the first voltage threshold), the multi-catalyst is characterized as storing oxygen but not full when the engine enters the FSO mode and as already storing oxygen when the engine exits the FSO mode. The ECU may acquire a first time when the engine enters the FSO mode, and a third time when the multi-catalyst is full of oxygen, for example, a time when the post-oxygen voltage value of the multi-catalyst falls to a second voltage threshold value, or the like. The ECU may then calculate the amount of oxygen included in the air that the engine has entered during the time interval based on the time interval between the first time and the third time, and this embodiment is referred to as the second intake air oxygen storage amount m for convenience of description 4 . Since a part of oxygen is already stored in the multi-catalyst when the engine enters the FSO mode, the ECU can store the oxygen amount m according to the second intake air 4 And a first post oxygen voltage value, calculateActual oxygen storage capacity of the multi-element catalyst. In particular, the ECU may determine the oxygen storage coefficient alpha based on the first post-oxygen voltage value, thereby storing the oxygen amount m based on the second intake air 4 And a first post-oxygen voltage value, the calculated actual oxygen storage amount of the multi-catalyst can be alpha x m 4 . The correspondence between the first post-oxygen voltage value and the oxygen storage coefficient may be determined by means of an experimental test or simulation, or the like, and may be configured in the ECU in advance.
In practical application, the process of calculating the actual oxygen storage amount of the multi-element catalyst can be packaged into an air model, namely, the ECU can calculate the actual oxygen storage amount of the multi-element catalyst through the air model. In addition, the above four implementations for calculating the oxygen storage amount of the multi-catalyst are merely illustrative, and in practical application, the ECU may accurately calculate the actual oxygen storage amount of the multi-catalyst by other methods, for example, by configuring a related device for specifically detecting the oxygen storage amount of the multi-catalyst, which is not limited in this embodiment.
S104: and calculating the fuel gas injection quantity of the engine according to the determined oxygen storage quantity of the multi-element catalyst.
After determining the real oxygen storage amount of the multi-element catalyst, the ECU can calculate the gas injection amount of the engine according to the oxygen storage amount. For example, the ECU may calculate the fuel gas injection amount corresponding to the actual oxygen storage amount according to a preset stoichiometric air-fuel ratio so that the air-fuel ratio of the engine can be made to reach or approach the stoichiometric air-fuel ratio when the engine is intake according to the fuel gas injection amount. Therefore, after the gas exhausted by the engine enters the multi-element catalyst, the multi-element catalyst can fully oxidize and reduce CO, hydrocarbon, NOx and other components in the gas by enough oxygen, so that the problem that the conversion efficiency of the multi-element catalyst is low due to small gas injection amount can be avoided, and the problem that the multi-element catalyst is difficult to fully convert harmful gas components in the gas due to large gas injection amount can also be avoided, thereby influencing the purification effect of the multi-element catalyst.
In this embodiment, since the ECU calculates the actual oxygen storage amount of the multi-catalyst according to the post-oxygen voltage values corresponding to the time when the multi-catalyst enters the FSO mode and exits the FSO mode, respectively, and further calculates the fuel gas injection amount of the engine according to the actual oxygen storage amount, instead of determining the fuel gas injection amount of the engine according to the default value of the oxygen storage amount, the ECU can generally make the air-fuel ratio of the engine more approximate to the theoretical air-fuel ratio, for example, when the oxygen storage amount is small, the ECU can reduce the injection amount of the fuel gas of the engine, etc., so as to improve the conversion efficiency of the multi-catalyst and ensure the purification effect affecting the multi-catalyst as much as possible.
In addition, the embodiment of the application also provides a device for determining the gas injection quantity. Referring to fig. 2, fig. 2 is a schematic structural diagram of an apparatus for determining a fuel gas injection amount according to an embodiment of the present application, where the apparatus 200 includes:
a first obtaining module 201, configured to obtain a first post-oxygen voltage value, where the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine enters a gas cut-off FSO mode;
a second obtaining module 202, configured to obtain a second post-oxygen voltage value, where the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode;
a determining module 203, configured to determine an oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value;
the calculation module 204 is configured to calculate a fuel gas injection amount of the engine according to the oxygen storage amount of the multi-catalyst.
In a possible implementation manner, the determining module 203 is specifically configured to calculate, when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is greater than a second voltage threshold, an oxygen storage amount of the multi-catalyst according to a time interval between a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, where the first voltage threshold is greater than the second voltage threshold.
In a possible implementation manner, the determining module 203 includes:
the first obtaining unit is configured to obtain a first time and a third time when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is not greater than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, and the third time is a time when the post-oxygen voltage value of the multi-catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first moment and the third moment.
In a possible implementation manner, the determining module 203 includes:
the second obtaining unit is configured to obtain a first time and a second time when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is larger than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, the second time is a time when the engine exits the FSO mode, and the first voltage threshold is larger than the second voltage threshold;
the second calculation unit is used for calculating a first intake air oxygen storage amount according to the time interval between the first moment and the second moment;
and the third calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first post-oxygen voltage value.
In a possible implementation manner, the determining module 203 includes:
the third obtaining unit is configured to obtain a first time and a third time when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, and the third time is a time when the post-oxygen voltage value of the multi-catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
a fourth calculation unit, configured to calculate a second intake air oxygen storage amount according to a time interval between the first time and the third time;
and a fifth calculation unit for calculating the oxygen storage amount of the multi-element catalyst according to the second intake air oxygen storage amount and the first post-oxygen voltage value.
It should be noted that, because the content of information interaction and execution process between each module and unit of the above-mentioned device is based on the same concept as the method embodiment in the embodiment of the present application, the technical effects brought by the content are the same as the method embodiment in the embodiment of the present application, and the specific content can be referred to the description in the foregoing method embodiment shown in the embodiment of the present application, which is not repeated here.
In addition, the embodiment of the application also provides a computing device. Referring to fig. 3, fig. 3 illustrates a schematic hardware architecture of a computing device 300, which may include a processor 301 and a memory 302, in accordance with an embodiment of the present application.
Wherein the memory 302 is configured to store a computer program;
the processor 301 is configured to execute the method for determining the fuel gas injection amount according to the embodiment of the method described above according to the computer program.
In addition, the embodiment of the application also provides a computer readable storage medium for storing a computer program for executing the method for determining the fuel gas injection quantity described in the above method embodiment.
The "first" in the names of the "first obtaining unit", "first post oxygen voltage value", and the like in the embodiment of the present application is only used for name identification, and does not represent the first in sequence. The rule applies equally to "second", "third", etc.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the method according to the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus embodiments described above are merely illustrative, in which the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The foregoing description of the exemplary embodiments of the application is merely illustrative of the application and is not intended to limit the scope of the application.
Claims (8)
1. A method of determining a fuel gas injection quantity, the method comprising:
acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to a multi-catalyst when an engine enters a fuel gas cut-off (FSO) mode;
acquiring a second post-oxygen voltage value, wherein the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode;
determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value;
the determining the oxygen storage amount of the multi-catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value comprises the following steps:
when the first post-oxygen voltage value is not smaller than a first voltage threshold value and the second post-oxygen voltage value is larger than a second voltage threshold value, calculating the oxygen storage amount of the multi-catalyst according to the time interval between a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, wherein the first voltage threshold value is larger than the second voltage threshold value;
and calculating the fuel gas injection quantity of the engine according to the oxygen storage quantity of the multi-element catalyst.
2. The method of claim 1, wherein the determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value comprises:
when the first post-oxygen voltage value is not smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, acquiring a first moment and a third moment, wherein the first moment is the moment when the engine enters the FSO mode, the third moment is the moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
and calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first time and the third time.
3. The method of claim 1, wherein the determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value comprises:
when the first post-oxygen voltage value is smaller than a first voltage threshold value and the second post-oxygen voltage value is larger than a second voltage threshold value, acquiring a first moment and a second moment, wherein the first moment is the moment when the engine enters the FSO mode, the second moment is the moment when the engine exits the FSO mode, and the first voltage threshold value is larger than the second voltage threshold value;
calculating a first intake air oxygen storage amount according to the time interval between the first moment and the second moment;
and calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first post-oxygen voltage value.
4. The method of claim 1, wherein the determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value comprises:
when the first post-oxygen voltage value is smaller than a first voltage threshold and the second post-oxygen voltage value is not larger than a second voltage threshold, acquiring a first moment and a third moment, wherein the first moment is the moment when the engine enters the FSO mode, the third moment is the moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is larger than the second voltage threshold;
calculating a second intake air oxygen storage amount according to the time interval between the first time and the third time;
and calculating the oxygen storage amount of the multi-element catalyst according to the second intake oxygen storage amount and the first post-oxygen voltage value.
5. An apparatus for determining a fuel gas injection amount, the apparatus comprising:
the first acquisition module is used for acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine enters a fuel gas cut-off (FSO) mode;
the second acquisition module is used for acquiring a second post-oxygen voltage value, wherein the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-catalyst when the engine exits the FSO mode;
the determining module is used for determining the oxygen storage amount of the multi-element catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value;
the determining module is specifically configured to calculate, when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is greater than a second voltage threshold, an oxygen storage amount of the multi-catalyst according to a time interval between a first time when the engine enters the FSO mode and a second time when the engine exits the FSO mode, where the first voltage threshold is greater than the second voltage threshold;
and the calculation module is used for calculating the fuel gas injection quantity of the engine according to the oxygen storage quantity of the multi-element catalyst.
6. The apparatus of claim 5, wherein the determining module comprises:
the first obtaining unit is configured to obtain a first time and a third time when the first post-oxygen voltage value is not less than a first voltage threshold and the second post-oxygen voltage value is not greater than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, and the third time is a time when the post-oxygen voltage value of the multi-catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first moment and the third moment.
7. A computing device, the device comprising a processor and a memory:
the memory is used for storing a computer program;
the processor is configured to perform the method of any of claims 1-4 according to the computer program.
8. A computer readable storage medium, characterized in that the computer readable storage medium is for storing a computer program for executing the method of any one of claims 1-4.
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