CN114233490A - Method and device for determining fuel gas injection amount and related equipment - Google Patents

Method and device for determining fuel gas injection amount and related equipment Download PDF

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Publication number
CN114233490A
CN114233490A CN202111584478.XA CN202111584478A CN114233490A CN 114233490 A CN114233490 A CN 114233490A CN 202111584478 A CN202111584478 A CN 202111584478A CN 114233490 A CN114233490 A CN 114233490A
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oxygen
post
voltage value
engine
moment
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CN114233490B (en
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谭海亮
赵令辉
潘永传
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • 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
    • 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

Abstract

The application discloses a method, a device and related equipment for determining fuel gas injection quantity, comprising the following steps: and acquiring a first rear oxygen voltage value which is a rear oxygen voltage value corresponding to the multi-element catalyst when the engine enters the FSO mode, and also acquiring a second rear oxygen voltage value which is a rear oxygen voltage value corresponding to the multi-element catalyst when the engine exits the FSO mode, so that the ECU determines the oxygen storage amount of the multi-element catalyst according to the first rear oxygen voltage value and the second rear oxygen voltage value, and calculates the fuel gas injection amount of the engine according to the oxygen storage amount of the multi-element catalyst. Because the actual oxygen storage amount of the multi-element catalyst can be calculated according to the first and second rear oxygen voltage values, the finally determined fuel gas injection amount of the engine can enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio generally, so that the conversion efficiency of the multi-element catalyst can be improved, and the influence on the purification effect of the multi-element catalyst can be guaranteed as far as possible.

Description

Method and device for determining fuel gas injection amount and related equipment
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a device for determining gas injection quantity and related equipment.
Background
Multi-element catalysts, such as three-way catalysts, etc., are the most important external purifying devices installed in the exhaust system of a vehicle. When high-temperature vehicle exhaust 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 oxide (NOx) in the vehicle exhaust gas, and can be converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction so as to purify the vehicle exhaust gas. Specifically, CO is oxidized at high temperature to colorless, non-toxic carbon dioxide gas; oxidation of hydrocarbons to water (H) at high temperatures20) And carbon dioxide; NOx is reduced to nitrogen and oxygen.
At present, when an engine of a vehicle enters a Fuel cut Off (FSO) mode, the engine stops injecting Fuel gas, and engine intake air is pure air, at which time a multi-element catalytic converter is in a state of storing oxygen. And when the engine exits the FSO mode, the air inlet of the engine is recovered to be mixed gas of fuel gas, air and waste gas, and at the moment, the engine enters a fuel gas injection richer state and is used 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 the desired value, thereby making the conversion efficiency of the multi-catalyst low.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining fuel gas injection quantity and related equipment, so that the conversion efficiency of a multi-element catalyst is improved.
In a first aspect, an embodiment of the present application provides a method for determining a gas injection amount, where the method includes:
acquiring a first post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to a multi-element catalyst when an engine enters a gas cutting 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-element catalyst when the engine exits the FSO mode;
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 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-element catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, where the first post-oxygen voltage value is greater than the second post-oxygen voltage value, includes:
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-element catalyst according to a time interval between a first moment when the engine enters the FSO mode and a second moment when the engine exits the FSO mode, wherein the first voltage threshold value is larger than the second voltage threshold value.
In one possible embodiment, the determining the oxygen storage amount of the multi-element catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, where the first post-oxygen voltage value is greater than the second post-oxygen voltage value, includes:
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, acquiring a first moment and a third moment, wherein the first moment is a moment when the engine enters the FSO mode, the third moment is a moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and 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 embodiment, the determining the oxygen storage amount of the multi-element catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, where the first post-oxygen voltage value is greater than 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 larger than a second voltage threshold, 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 is larger than the second voltage threshold;
calculating a first intake oxygen storage amount according to a time interval between the first time and the second time;
and calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first back oxygen voltage value.
In one possible embodiment, the determining the oxygen storage amount of the multi-element catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, where the first post-oxygen voltage value is greater than 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 oxygen storage amount according to a 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 back oxygen voltage value.
In a second aspect, an embodiment of the present application further provides an apparatus for determining a gas injection amount, where the apparatus includes:
the first obtaining module is used for obtaining a first post-oxygen voltage value, and the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element catalyst when the engine enters a gas cutting FSO mode;
the second obtaining module is used for obtaining a second post-oxygen voltage value, and the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element 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 a possible implementation, the determining module is specifically configured to calculate the oxygen storage amount of the multi-element 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, 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, where the first voltage threshold is greater than the second voltage threshold.
In one possible implementation, the determining module includes:
a first obtaining unit, 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, the third time is a time when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculating 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:
a second obtaining unit, 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 the first intake oxygen storage amount according to the time interval between the first time and the second time;
and the third calculating unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the first air inlet oxygen storage amount and the first rear oxygen voltage value.
In one possible implementation, the determining module includes:
a third obtaining unit, 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 greater than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, the third time is a time when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
the fourth calculation unit is used for calculating a second intake oxygen storage amount according to the time interval between the first time and the third time;
and the fifth calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the second intake oxygen storage amount and the first rear oxygen voltage value.
In a third aspect, an embodiment of the present application further provides a computing device, where the computing device may include a processor and a memory:
the memory is used for storing a computer program;
the processor is configured to perform the method according to any of the embodiments of the first aspect and the first aspect.
In a fourth aspect, this 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 execute the method described in any one of the foregoing first aspect and the first aspect.
In the foregoing 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 the multi-component catalyst when the engine enters the 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-component catalyst when the engine exits the FSO mode, so that the ECU determines the oxygen storage amount of the multi-component catalyst according to the first post-oxygen voltage value and the second post-oxygen voltage value, and calculates the fuel gas injection amount of the engine according to the oxygen storage amount of the multi-component catalyst. The actual oxygen storage amount of the multi-element catalyst is calculated according to the corresponding rear oxygen voltage values of the multi-element catalyst when the engine enters the FSO mode and exits the FSO mode, the fuel gas injection amount of the engine is further calculated according to the actual oxygen storage amount, and the fuel gas injection amount of the engine is not determined according to the default value of the oxygen storage amount, so that the finally determined fuel gas injection amount of the engine can enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio, for example, the injection amount of the fuel gas of the engine can be reduced when the oxygen storage amount is less, the conversion efficiency of the multi-element catalyst can be improved, and the purification effect of the multi-element catalyst is guaranteed to be influenced as much as possible.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart of a method for determining a fuel gas injection amount according to an embodiment of the present application;
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;
fig. 3 is a schematic diagram of a hardware structure of a computing device in an embodiment of the present application.
Detailed Description
At present, when an engine of a vehicle enters a Fuel cut Off (FSO) mode, the engine stops injecting Fuel gas, and engine intake air is pure air, at which time a multi-element catalytic converter is in a state of storing oxygen. And when the engine exits the FSO mode, the air inlet of the engine is recovered to be mixed gas of fuel gas, air and waste gas, and at the moment, the engine enters a fuel gas injection richer state and is used for consuming oxygen stored by the multi-element catalyst.
In order to effectively utilize a multi-element catalyst (such as a three-way catalyst), the air-fuel ratio of the engine can be controlled to be close to the theoretical air-fuel ratio (i.e., the air-fuel ratio of the multi-element catalyst under the ideal condition of high-efficiency conversion). The air-fuel ratio refers to the mass ratio of air to fuel gas in the mixture entering the engine, and can be expressed by the gram of air consumed by the combustion of each gram of fuel gas. However, when the engine exits the FSO mode, an Electronic Control Unit (ECU) typically determines the fuel gas injection amount at the time of engine intake based on the oxygen storage amount (or other default) of the multi-element catalyst when it is full of oxygen. However, in many scenarios of practical use, the multi-component catalyst may not be full of oxygen when the engine exits the FSO mode. For example, during a shift, the time interval from entering the FSO mode to exiting the FSO mode of the engine is short (e.g., 1 second, etc.), during which the air entering the engine is not normally able to keep the multi-element catalyst 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 to approach the theoretical air-fuel ratio, so that the conversion efficiency of the multi-element catalyst is low, and even the purification effect of the multi-element catalyst is affected.
Based on the method, the embodiment of the application provides a method for determining the fuel gas injection amount, and aims to improve the conversion efficiency of a multi-element catalyst. In the concrete implementation, the ECU firstly acquires a first rear oxygen voltage value, the first rear oxygen voltage value is a rear oxygen voltage value corresponding to the multi-element catalyst when the engine enters the FSO mode, and also acquires a second rear oxygen voltage value, the second rear oxygen voltage value is a rear oxygen voltage value corresponding to the multi-element catalyst when the engine exits the FSO mode, so that the ECU determines the oxygen storage amount of the multi-element catalyst according to the first rear oxygen voltage value and the second rear oxygen voltage value, and calculates the fuel gas injection amount of the engine according to the oxygen storage amount of the multi-element catalyst.
The ECU calculates the actual oxygen storage amount of the multi-element catalyst according to the corresponding rear oxygen voltage values of the multi-element catalyst when the engine enters the FSO mode and exits the FSO mode, 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, so that the finally determined fuel gas injection amount of the engine by the ECU can enable the air-fuel ratio of the engine to be closer to the theoretical air-fuel ratio.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, various non-limiting embodiments accompanying the present application examples are described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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 application.
Referring to fig. 1, fig. 1 shows a flowchart of a method for determining a gas injection amount in an embodiment of the present application, which 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 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, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element catalyst when the engine enters the FSO mode.
In this embodiment, a rear Oxygen sensor may be disposed near the multi-element catalyst in advance, and a rear Oxygen voltage value of the multi-element catalyst may be measured by the rear Oxygen sensor, so as to determine an Oxygen Storage Capacity (OSC) of the multi-element catalyst according to the rear Oxygen voltage value. For example, when the post-oxygen voltage value of the multi-element catalyst is greater than 1.6V (volt), the multi-element catalyst is characterized by not storing oxygen; 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-element catalyst is between 0.5V and 1.6V, the multi-element catalyst is characterized in that oxygen is stored but not fully stored. The oxygen storage amount of the multi-element catalyst is negatively related to the rear oxygen voltage value, because the more the oxygen storage amount in the multi-element catalyst is, the more the number of the oxygen anions is, and the existence of the oxygen anions enables the rear oxygen voltage value to be smaller.
In addition, the multi-element catalyst in the embodiment may be, for example, a three-element catalyst, and is mainly used for oxidizing and reducing harmful gases such as carbon monoxide, hydrocarbons, and nitrogen oxides in the gas mixture into harmless gases. Or the multi-element catalyst can also be a quaternary catalyst, and the quaternary catalyst can be a three-element catalyst, and the function of cleaning solid microparticles in the mixer is added. In this embodiment, the specific implementation manner of the multi-element catalyst is not limited.
When the engine enters the FSO mode, such as when the vehicle is currently performing a gear shift process, the engine intake is typically switched from a combustible mixture to air, during which the gas input by the engine into the multi-element catalyst is typically not a combustible mixture, but rather air entering the engine. Thus, the multi-element catalyst may extract oxygen (which may specifically be oxygen anions) from the incoming air. And the back oxygen voltage value measured by the back oxygen sensor is continuously reduced along with the increase of the oxygen storage amount of the multi-element catalyst.
In this embodiment, when the engine enters the FSO mode, the ECU may measure a first post oxygen voltage value corresponding to the multi-component catalyst at that time via the post oxygen sensor, and the first post oxygen voltage value may represent an oxygen storage state of the multi-component 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 that no oxygen is stored in the multi-element catalyst, and when the first post-oxygen voltage value is less than the first voltage threshold, it is indicative that a certain amount of oxygen is stored in the multi-element catalyst. It will be appreciated that because the multi-component catalyst may have been in the process of a redox reaction until then, the multi-component catalyst is typically not full of oxygen.
S102: and acquiring a second post-oxygen voltage value, wherein the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element catalyst when the engine exits the FSO mode.
When the engine exits the FSO mode, the ECU can measure a second post oxygen voltage value corresponding to the multi-element catalyst after the multi-element catalyst stores oxygen for a period of time through the post oxygen sensor so as to determine the content of the oxygen currently stored by the multi-element catalyst. Wherein the second post-oxygen voltage value may be indicative of an oxygen storage state of the multi-component 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 indicates that the multi-catalyst is not full of oxygen, and when the second post-oxygen voltage value is not greater than (i.e., less than or equal to) the second voltage threshold, it indicates that the multi-catalyst is full of oxygen.
It is noted that when the engine exits the FSO mode, the gas in the multi-catalyst may also contain a portion of oxygen that is not stored by the multi-catalyst in a timely manner, or that the multi-catalyst is currently unable to continue storing oxygen in the gas. 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-element 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 only according to the second post-oxygen voltage value, the gas injection amount of the engine may be small, and further the air-fuel ratio of the engine is large, and it is difficult to achieve the stoichiometric air-fuel ratio. On the other hand, if the ECU determines the gas injection amount of the engine directly based on the maximum oxygen storage amount of the multi-element catalyst, the gas injection amount of the engine may be too large, and the air-fuel ratio of the engine may be too small, so that it is difficult to achieve the stoichiometric air-fuel ratio. Based on this, the embodiment may further execute step S103 to determine the actual oxygen storage amount of the multi-catalyst.
S103: and determining the oxygen storage amount of the multi-element catalyst according to the first and second post oxygen voltage values.
In this embodiment, the ECU may determine the actual oxygen storage amount of the multi-element catalyst in conjunction with the post-oxygen voltage values that the engine respectively corresponds to when entering and exiting the FSO mode.
Illustratively, the present embodiment provides the following four implementations for determining the actual oxygen storage amount of the multi-element 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 a second voltage threshold (the second voltage value is less than the first voltage threshold), indicating that the multi-element catalyst does not store oxygen when the engine enters the FSO mode and stores oxygen but is not full when the engine exits the FSO mode, 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, and the like. 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 can be understood that during the period that the engine enters the FSO mode, the ECU can acquire the air intake flow of the engine, such as sensing through a sensor or indicating the engine to enter the air according to a preset flow and the like, so that the ECU can calculate the total flow of the air entering the engine in the time interval between the first moment and the second moment through mathematical integration and the like, and further calculate the oxygen storage amount m of the multi-element catalyst based on the total flow1。
(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), it is characterized that the multi-element catalyst does not store oxygen when the engine enters the FSO mode and is full of oxygen when the engine exits the FSO mode or before exiting the FSO mode. It will be appreciated that the multi-catalyst has a limited oxygen storage capacity 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 take a first time when the engine enters the FSO mode and determine a third time when the multi-catalyst is full of oxygen, such as when the post-oxygen voltage value of the multi-catalyst drops to a second voltage threshold,and, the third time is no later than the time the engine exits the FSO mode. Thus, the ECU can calculate the oxygen storage amount m of the multi-element catalyst according to the time interval between the first time and the third time2Determining oxygen storage m of the multi-element catalyst, e.g. by calculating the integral of the engine intake air quantity over the time interval2And the like.
(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), the multi-element catalyst is characterized as storing oxygen but not being full when the engine enters the FSO mode and is still not full when the engine exits the FSO mode. Then, 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 amount of oxygen included in air that the engine enters 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 in this embodiment3. Since part of oxygen is stored in the multi-element catalyst when the engine enters the FSO mode, the ECU can store oxygen according to the first intake air oxygen storage amount m3And calculating the actual oxygen storage amount of the multi-element catalyst according to the first post-oxygen voltage value. In particular, the ECU can determine the oxygen storage coefficient alpha according to the first rear oxygen voltage value, so as to determine the oxygen storage coefficient alpha according to the first intake oxygen storage amount m3And a first post-oxygen voltage value, the calculated actual oxygen storage amount of the multi-element catalyst may be α m3. The correspondence between the first post-oxygen voltage value and the oxygen storage coefficient may be determined by an experimental test, a simulation, or the like, and may be configured in advance in the ECU.
(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-element catalyst is characterized as storing oxygen but not being full when the engine enters the FSO mode and being full when the engine exits the FSO mode. The ECU may then capture the first time the engine enters FSO mode and the time when the multi-element catalyst is full of oxygenThe third time may be, for example, a time when the post-oxygen voltage value of the multi-element catalyst falls to the second voltage threshold. Then, the ECU may calculate the amount of oxygen included in the air taken in by the engine during the time interval between the first time and the third time, which is referred to as a second intake oxygen storage amount m for convenience of description in this embodiment4. Since part of oxygen is already stored in the multi-element catalyst when the engine enters the FSO mode, the ECU can store oxygen according to the second intake air oxygen storage amount m4And calculating the actual oxygen storage amount of the multi-element catalyst according to the first post-oxygen voltage value. In particular, the ECU can determine the oxygen storage coefficient alpha according to the first oxygen voltage value, so as to determine the oxygen storage coefficient alpha according to the second air inlet oxygen storage amount m4And a first post-oxygen voltage value, the calculated actual oxygen storage amount of the multi-element catalyst may be α m4. The correspondence between the first post-oxygen voltage value and the oxygen storage coefficient may be determined by an experimental test, a simulation, or the like, and may be configured in advance in the ECU.
In actual 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 implementation manners of calculating the oxygen storage amount of the multi-element catalyst are only used as some exemplary illustrations, and in practical applications, the ECU may also accurately calculate the actual oxygen storage amount of the multi-element catalyst by other manners, such as calculation by configuring a related device that is specially configured to detect the oxygen storage amount of the multi-element catalyst, and the like, 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 fuel gas injection amount of the engine according to the oxygen storage amount. For example, the ECU may calculate a gas injection amount corresponding to the true oxygen storage amount based on a preset stoichiometric air-fuel ratio so that the air-fuel ratio of the engine reaches or approaches the stoichiometric air-fuel ratio when the engine is charged in accordance with the gas injection amount. Therefore, after the gas exhausted by the engine enters the multi-element catalyst, the multi-element catalyst can sufficiently oxidize and reduce the components such as CO, hydrocarbon, NOx and the like in the gas by using enough oxygen, so that the low conversion efficiency of the multi-element catalyst caused by the small gas injection quantity can be avoided, and the problem that the harmful gas components in the gas are difficult to convert by the multi-element catalyst due to the large gas injection quantity can be avoided, so that the purification effect of the multi-element catalyst is influenced.
In this embodiment, the ECU calculates the actual oxygen storage amount of the multi-element catalyst according to the post-oxygen voltage values corresponding to the multi-element catalyst when the engine enters the FSO mode and exits the FSO mode, and further calculates the gas injection amount of the engine 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, so that the gas injection amount of the engine finally determined by the ECU can generally make the air-fuel ratio of the engine closer to the theoretical air-fuel ratio.
In addition, the embodiment of the application also provides a device for determining the gas injection quantity. Referring to fig. 2, fig. 2 shows a schematic structural diagram of an apparatus for determining a gas injection amount in an embodiment of the present application, where the apparatus 200 includes:
the first obtaining module 201 is configured to obtain a first post-oxygen voltage value, where the first post-oxygen voltage value is a post-oxygen voltage value corresponding to a multi-element 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-element catalyst when the engine exits the FSO mode;
the determining module 203 is configured to determine an 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 204 is used for calculating the fuel gas injection quantity of the engine according to the oxygen storage quantity of the multi-element catalyst.
In a possible implementation, the determining module 203 is specifically configured to calculate the oxygen storage amount of the multi-element 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, 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, where the first voltage threshold is greater than the second voltage threshold.
In a possible implementation, the determining module 203 includes:
a first obtaining unit, 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, the third time is a time when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculating 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, the determining module 203 includes:
a second obtaining unit, 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 the first intake oxygen storage amount according to the time interval between the first time and the second time;
and the third calculating unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the first air inlet oxygen storage amount and the first rear oxygen voltage value.
In a possible implementation, the determining module 203 includes:
a third obtaining unit, 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 greater than a second voltage threshold, where the first time is a time when the engine enters the FSO mode, the third time is a time when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
the fourth calculation unit is used for calculating a second intake oxygen storage amount according to the time interval between the first time and the third time;
and the fifth calculation unit is used for calculating the oxygen storage amount of the multi-element catalyst according to the second intake oxygen storage amount and the first rear oxygen voltage value.
It should be noted that, for the contents of information interaction, execution process, and the like between the modules and units of the apparatus, since the same concept is based on the method embodiment in the embodiment of the present application, the technical effect brought by the contents is the same as that of the method embodiment in the embodiment of the present application, and specific contents may refer to the description in the foregoing method embodiment in the embodiment of the present application, and are not described herein again.
In addition, the embodiment of the application also provides the computing equipment. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a hardware structure of a computing device in an embodiment of the present application, where the device 300 may include a processor 301 and a memory 302.
Wherein the memory 302 is used for storing computer programs;
the processor 301 is configured to execute the method for determining the fuel injection amount according to the computer program in the above method embodiment.
In addition, the present application also provides a computer readable storage medium for storing a computer program for executing the method for determining the fuel injection amount described in the above method embodiments.
The "first" in the names of "first obtaining unit", "first post oxygen voltage value", and the like mentioned in the embodiments of the present application is used only for name identification and does not represent the first in order. The same applies to "second", "third", etc.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. 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, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only an exemplary embodiment of the present application, and is not intended to limit the scope of the present application.

Claims (10)

1. A method of determining a 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-element catalyst when an engine enters a gas cutting 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-element catalyst when the engine exits the FSO mode;
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 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 determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, wherein the first post-oxygen voltage value is greater than the second post-oxygen voltage value, comprises:
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-element catalyst according to a time interval between a first moment when the engine enters the FSO mode and a second moment when the engine exits the FSO mode, wherein the first voltage threshold value is larger than the second voltage threshold value.
3. The method of claim 1, wherein determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, wherein the first post-oxygen voltage value is greater than the second post-oxygen voltage value, comprises:
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, acquiring a first moment and a third moment, wherein the first moment is a moment when the engine enters the FSO mode, the third moment is a moment when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and calculating the oxygen storage amount of the multi-element catalyst according to the time interval between the first moment and the third moment.
4. The method of claim 1, wherein determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, wherein the first post-oxygen voltage value is greater than 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 larger than a second voltage threshold, 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 is larger than the second voltage threshold;
calculating a first intake oxygen storage amount according to a time interval between the first time and the second time;
and calculating the oxygen storage amount of the multi-element catalyst according to the first intake oxygen storage amount and the first back oxygen voltage value.
5. The method of claim 1, wherein determining the oxygen storage amount of the multi-catalyst based on the first post-oxygen voltage value and the second post-oxygen voltage value, wherein the first post-oxygen voltage value is greater than 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 oxygen storage amount according to a 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 back oxygen voltage value.
6. An apparatus for determining a gas injection amount, the apparatus comprising:
the first obtaining module is used for obtaining a first post-oxygen voltage value, and the first post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element catalyst when the engine enters a gas cutting FSO mode;
the second obtaining module is used for obtaining a second post-oxygen voltage value, and the second post-oxygen voltage value is a post-oxygen voltage value corresponding to the multi-element 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.
7. The apparatus of claim 6, wherein the determination module is specifically configured to calculate the oxygen storage amount of the multi-element 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 when the first post-oxygen voltage value is not less than a first voltage threshold value and the second post-oxygen voltage value is greater than a second voltage threshold value, wherein the first voltage threshold value is greater than the second voltage threshold value.
8. The apparatus of claim 6, wherein the determining module comprises:
a first obtaining unit, 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, the third time is a time when the post-oxygen voltage value of the multi-element catalyst is the second voltage threshold, and the first voltage threshold is greater than the second voltage threshold;
and the first calculating 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.
9. 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 1-5 in accordance with the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program for performing the method of any of claims 1-5.
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