阅读说明：本技术 提高发动机废气排放一致性的方法、设备及存储介质 (Method, equipment and storage medium for improving consistency of engine exhaust emission ) 是由 耿磊 袁志玲 王孝莉 刘正锐 于 2020-12-14 设计创作，主要内容包括：本申请涉及发动机领域,公开一种提高发动机废气排放一致性的方法、设备及存储介质。该方法包括以下步骤：根据发动机排放废气中的氮氧测量值调整增压器的空气进气量和废气进气量,以使氮氧测量值与增压器在标定工况下的氮氧标定值的比较值满足第一预设值。利用该方法解决现有发动机中增压器在中低压工况下运行时会导致发动机裸排氮氧化物差异较大的问题。(The application relates to the field of engines, and discloses a method, equipment and a storage medium for improving exhaust emission consistency of an engine. The method comprises the following steps: and adjusting the air intake quantity and the exhaust gas intake quantity of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine, so that the comparison value of the measured value of the nitrogen and oxygen and the calibrated value of the nitrogen and oxygen of the supercharger under the calibrated working condition meets a first preset value. The method solves the problem that the difference of the naked nitrogen oxide of the engine is large when the supercharger in the existing engine operates under the working condition of medium and low pressure.)

1. A method of improving the consistency of engine exhaust emissions, comprising the steps of:

adjusting air intake quantity and exhaust gas intake quantity of a supercharger according to a measured value of nitrogen and oxygen in exhaust gas discharged by an engine, so that a comparison value of the measured value of nitrogen and oxygen and a nitrogen and oxygen calibration value of the supercharger under a calibration working condition meets a first preset value.

2. The method of claim 1, wherein prior to the step of adjusting the air intake and exhaust gas intake of the supercharger based on the measured value of nitrogen oxide in the exhaust gas emitted from the engine, the method further comprises:

acquiring the actual total intake air amount of the supercharger under the actual working condition;

and determining that the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value.

3. The method of claim 2, wherein the comparison of the actual total intake air amount and the calibrated total intake air amount is a difference between the actual total intake air amount and the calibrated total intake air amount.

4. A method according to claim 2 or 3, characterized in that said second preset value is 8-15 vol% of said nominal total intake air.

5. A method according to any one of claims 1-3, wherein said adjusting the air intake and exhaust gas intake of the supercharger in dependence on the measured value of nitrogen oxide in the exhaust gas from the engine comprises:

and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen values so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values meets the first preset value.

6. An apparatus, comprising: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of:

adjusting air intake quantity and exhaust gas intake quantity of a supercharger according to a measured value of nitrogen and oxygen in exhaust gas discharged by an engine, so that a comparison value of the measured value of nitrogen and oxygen and a nitrogen and oxygen calibration value of the supercharger under a calibration working condition meets a first preset value.

7. The apparatus of claim 6, wherein the processor, prior to performing the steps of adjusting air intake and exhaust gas intake of the supercharger based on a measure of nitrogen oxide in exhaust gas emitted from the engine, is further configured to perform the steps of:

acquiring the actual total intake air amount of the supercharger under the actual working condition;

and determining that the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value.

8. The apparatus of claim 7, wherein the processor is specifically configured to use a difference between the actual total intake air amount and the calibrated total intake air amount as the comparison of the actual total intake air amount and the calibrated total intake air amount.

9. An apparatus according to any one of claims 6-8, characterized in that the processor is specifically adapted to effect said adjusting of the air intake and exhaust gas intake of the supercharger in dependence on the measured value of nitrogen oxide in the exhaust gases from the engine by:

and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen values so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values meets the first preset value.

10. A storage medium, characterized in that the storage medium has stored therein a program code, which is arranged to perform the steps of the method of any of claims 1-5 when executed.

Technical Field

The present application relates to the field of engines, and more particularly, to a method, apparatus, and storage medium for improving consistency of engine exhaust emissions.

Background

In engines, it is common to use devices that provide a supercharger in front of the engine cylinder to increase the intake pressure of the engine cylinder. Air prior to entering the engine cylinders is compressed by a supercharger to increase the density of the air, allowing more air to fill the cylinders, thereby increasing the power of the engine. In order to reduce nitrogen oxides in the exhaust gas of the engine and improve the utilization rate of fuel, the exhaust gas of the engine is partially introduced into the supercharger by an Exhaust Gas Recirculation (EGR) technique, so that the natural gas in the exhaust gas can be recycled.

When the supercharger operates under the calibration working condition, the total amount of the air fed into the engine is the calibration air intake amount and the calibration waste gas intake amount under the calibration working condition, and the content of nitrogen oxides in the waste gas is controlled within the range of a nitrogen-oxygen calibration value under the calibration working condition. However, the supercharger will enter a medium-low pressure operating state due to normal wear, assembly and manufacturing differences, consistency differences, and the like, thereby causing a decrease in air intake capacity, i.e., the actual total intake air amount does not reach the calibrated total intake air amount. At the moment, if the EGR valve control mode still uses the calibration air intake quantity and the calibration exhaust gas intake quantity for air intake, the difference of the engine naked nitrogen oxide is often large, and the risk of tail emission and PM emission exceeding standard is indirectly improved due to the difference of the naked nitrogen oxide.

Disclosure of Invention

The application discloses a method, equipment and a storage medium for improving exhaust emission consistency of an engine, which aim to solve the problem that the difference of naked nitrogen oxide of the engine is large when a supercharger in the existing engine operates under a medium-low pressure working condition.

In order to achieve the purpose, the application provides the following technical scheme:

in a first aspect, the present application provides a method of improving consistency of exhaust emissions from an engine, comprising the steps of:

and adjusting the air intake quantity and the exhaust gas intake quantity of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine, so that the comparison value of the measured value of the nitrogen and oxygen and the calibrated value of the nitrogen and oxygen of the supercharger under the calibrated working condition meets a first preset value.

Further, before the step of adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of nitrogen and oxygen in the exhaust gas discharged by the engine, the method further comprises the following steps:

acquiring the actual total intake air amount of the supercharger under the actual working condition;

and determining that the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value.

Further, the comparison value of the actual total intake air amount and the calibrated total intake air amount is the difference value of the actual total intake air amount and the calibrated total intake air amount.

Further, the second preset value is 8% -15% of the calibrated total intake air amount.

Further, adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of nitrogen and oxygen in the exhaust gas discharged by the engine comprises the following steps:

and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen value so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a second preset value.

In a second aspect, an apparatus, comprising: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of:

and adjusting the air intake quantity and the exhaust gas intake quantity of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine, so that the comparison value of the measured value of the nitrogen and oxygen and the calibrated value of the nitrogen and oxygen of the supercharger under the calibrated working condition meets a first preset value.

Further, the processor is configured to perform the following steps before performing the step of adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen oxide in the exhaust gas discharged by the engine:

acquiring the actual total intake air amount of the supercharger under the actual working condition;

and determining that the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value.

Further, the processor is specifically configured to use a difference between the actual total intake air amount and the calibrated total intake air amount as a comparison value between the actual total intake air amount and the calibrated total intake air amount.

Further, the processor is specifically configured to implement the adjustment of the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen oxide in the exhaust gas discharged from the engine by:

and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen value so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a second preset value.

In a third aspect, a storage medium has stored therein program code, the program code being arranged to perform the steps of the method of the first aspect provided herein when run.

By adopting the technical scheme of the application, the beneficial effects are as follows:

according to the method, the air intake quantity and the exhaust gas intake quantity are adjusted according to the nitrogen and oxygen measurement value in the exhaust gas discharged by the engine, so that the comparison value between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a first preset value. According to the method, when the capacity of the supercharger is insufficient, the difference between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values is adjusted in an optimized mode, so that the comparison value between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values meets a first preset value, the consistency of the naked nitrogen and oxygen exhaust of the engine can be improved, and the emission of nitrogen oxides and PM in the tail exhaust is reduced. The method has important significance for controlling the oil consumption of the engine and improving the fuel economy by controlling the consistency of the naked discharged nitrogen and oxygen. In addition, the method provided by the application can be suitable for WP2.3N/3N six-country engines, the consistency of delivery inspection and spot check of the engines can be improved, the fuel economy of users in the using process is improved, and the generated economic benefit is far-reaching.

Drawings

FIG. 1 is a schematic flow chart of a method for improving consistency of exhaust emissions from an engine according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the 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.

The application scenario described in the embodiment of the present application is for more clearly illustrating the technical solution of the embodiment of the present application, and does not form a limitation on the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. In the description of the present application, the term "plurality" means two or more unless otherwise specified.

The embodiment of the application provides a method for improving exhaust emission consistency of an engine, which comprises the following steps:

and adjusting the air intake quantity and the exhaust gas intake quantity of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine, so that the comparison value of the measured value of the nitrogen and oxygen and the calibrated value of the nitrogen and oxygen of the supercharger under the calibrated working condition meets a first preset value.

According to the method for improving the exhaust emission consistency of the engine, the air inflow and the exhaust gas inflow are adjusted according to the nitrogen and oxygen measurement value in the exhaust gas emitted by the engine, so that the comparison value between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a first preset value. According to the method, when the capacity of the supercharger is insufficient, the difference between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values is adjusted in an optimized mode, so that the comparison value between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values meets a first preset value, the consistency of the naked nitrogen and oxygen exhaust of the engine can be improved, and the emission of nitrogen oxides and PM in the tail exhaust is reduced. The method has important significance for controlling the oil consumption of the engine and improving the fuel economy by controlling the consistency of the naked discharged nitrogen and oxygen. In addition, the method provided by the application can be suitable for WP2.3N/3N six-country engines, the consistency of delivery inspection and spot check of the engines can be improved, the fuel economy of users in the using process is improved, and the generated economic benefit is far-reaching.

The first preset value can be a comparison value between a nitrogen and oxygen measurement value and a nitrogen and oxygen calibration value, a ratio between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value, or a ratio between a difference between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value. The concrete setting can be carried out according to the concrete condition of the supercharger.

The nitrogen-oxygen measurement value can be used for detecting the content of nitrogen oxides in the exhaust gas in real time by using a sensor arranged at an exhaust gas outlet of the engine.

In one embodiment of the present application, the first predetermined value is a ratio of a difference between a measured value of nitrogen and oxygen and a nominal value of nitrogen and oxygen to the nominal value of nitrogen and oxygen, and an absolute value of the ratio may be controlled within a range of 1%, for example, and the measured value of nitrogen and oxygen may be considered to be approximately the same as the nominal value of nitrogen and oxygen.

In one embodiment of the present application, the method further comprises: acquiring the actual total intake air amount of the supercharger under the actual working condition; and determining whether the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value or not so as to determine whether to adjust the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine.

Whether the supercharger operates under the calibration working condition can be determined by controlling whether the comparison value of the actual air inlet total amount and the calibration air inlet total amount of the supercharger exceeds a second preset value.

In one embodiment of the present application, adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of nitrogen and oxygen in the exhaust gas discharged from the engine includes: and when the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value, adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine.

When the comparison value of the actual air intake total amount and the calibrated air intake total amount of the supercharger exceeds a second preset value, the supercharger can be considered to be operated outside the calibrated working condition, at the moment, the supercharging capacity of the supercharger is reduced, and the actual air intake total amount of the supercharger cannot meet the index requirements of various parameters of the supercharger under the calibrated working condition. At this time, the air intake amount and the exhaust gas intake amount of the supercharger need to be adjusted according to the measured value of nitrogen and oxygen in the exhaust gas discharged by the engine so that the actual total intake amount meets the requirement of the engine.

It can be understood that the comparison value between the actual total intake air amount and the calibrated total intake air amount may be a difference value between the actual total intake air amount and the calibrated total intake air amount, a ratio value between the actual total intake air amount and the calibrated total intake air amount, or a ratio value between a difference value between the actual total intake air amount and the calibrated total intake air amount.

In one embodiment of the present application, the comparison value between the actual total intake air amount and the calibrated total intake air amount is a difference value between the actual total intake air amount and the calibrated total intake air amount, and the second preset value is 8-15 vol% of the calibrated total intake air amount. The second preset value may be, for example, 8 vol%, 9 vol%, 10 vol%, 11 vol%, 12 vol%, 13 vol%, 14 vol%, or 15 vol% of the nominal total intake air amount, and so on.

The difference value between the actual air intake total amount and the calibrated air intake total amount is used as a comparison value of the actual air intake total amount and the calibrated air intake total amount, so that the difference between the actual air intake total amount and the calibrated air intake total amount can be evaluated more intuitively. When the difference between the actual total intake air amount and the calibrated total intake air amount exceeds 8-15 vol% of the calibrated total intake air amount, the total intake air amount of the supercharger needs to be adjusted so that the actual total intake air amount meets the requirement of the engine.

Wherein, the actual total amount of intake air can be measured by a flow meter arranged at the air inlet of the supercharger.

In one embodiment of the present application, adjusting the air intake amount and the exhaust gas intake amount of a supercharger according to a measured value of nitrogen and oxygen in exhaust gas discharged from an engine includes: and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen value so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a first preset value.

The EGR valve is connected with the air inlet end of the supercharger and is mixed with fresh air and then is sent into the supercharger together. The EGR valve can control the introduction amount of the exhaust gas introduced into the supercharger, and when the opening degree of the EGR valve is not completely closed and is not completely opened, part of the exhaust gas is introduced into the supercharger and then enters the engine for cyclic utilization; when the opening degree of the EGR valve is 0, all gas entering the supercharger is fresh air at the moment; when the opening degree of the EGR valve is 100%, all the exhaust gas discharged by the engine enters the engine through the supercharger for recycling.

It should be noted that, after the operating mode of the supercharger changes, the total intake air amount is the actual intake total amount, and by adjusting the opening degree of the EGR valve, the air intake amount and the exhaust gas intake amount in the actual intake total amount can be adjusted, and the oxygen contained in the actual intake total amount after the two are mixed can meet the consumption of fuel in the engine, so that the nitrogen and oxygen measurement value in the exhaust gas discharged by the engine meets the nitrogen and oxygen calibration value.

Wherein the adjustment of the opening of the EGR valve may be closed loop adjusted by means of an engine control system. For example, when the EGR valve is at a certain opening degree, the measured value of the nitrogen and the oxygen is compared with a nitrogen and oxygen calibration value, and if the comparison value of the two values does not meet the requirement of a first preset value, the opening degree of the EGR valve is continuously adjusted; if the corresponding nitrogen and oxygen measured value is equal to the nitrogen and oxygen calibration value, the EGR valve can be controlled under the opening degree, and the adjustment of the opening degree of the EGR valve is completed.

A method for improving the consistency of engine exhaust emissions according to an embodiment of the present application is explained below with reference to fig. 1. As shown in fig. 1, the method comprises the steps of:

s11) measuring an actual intake air flow rate C1 using a gas flow meter provided at an intake end of the supercharger;

s12) comparing the actual total intake air quantity C1 with the calibrated total intake air quantity C0;

s13) when the difference value between the actual total intake air quantity C1 and the calibrated total intake air quantity C0 exceeds 10 vol% of the calibrated total intake air quantity C0, acquiring a nitrogen oxygen measured value N1 in the exhaust gas of the engine;

s14) comparing the nitrogen and oxygen measured value N1 with the nitrogen and oxygen calibrated value N0, and if the two are different, adjusting the EGR opening degree;

s15) repeating step S14) until the measured nitrogen-oxygen value N1 is equal to the calibrated nitrogen-oxygen value N0, at which time the air intake is a1, the exhaust gas intake is B1, and the actual total intake C1 is the sum of the air intake a1 and the exhaust gas intake B1.

Based on the same inventive concept, the embodiment of the present application provides an apparatus, including: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of: and adjusting the air intake quantity and the exhaust gas intake quantity of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine, so that the comparison value of the measured value of the nitrogen and oxygen and the calibrated value of the nitrogen and oxygen of the supercharger under the calibrated working condition meets a first preset value.

The application provides an equipment, according to the nitrogen oxygen measured value adjustment air intake and the waste gas air intake in the engine exhaust gas to make the nitrogen oxygen measured value and the booster satisfy first default with the comparative value of the nitrogen oxygen calibration value under the calibration operating mode. According to the method, when the capacity of the supercharger is insufficient, the difference between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values is adjusted in an optimized mode, so that the comparison value between the measured nitrogen and oxygen values and the calibrated nitrogen and oxygen values meets a first preset value, the consistency of the naked nitrogen and oxygen exhaust of the engine can be improved, and the emission of nitrogen oxides and PM in the tail exhaust is reduced. The equipment of this application is through the consistency of control naked nitrogen discharging oxygen, to control engine oil consumption, improve fuel economy and have the significance. In addition, the device provided by the application can be suitable for WP2.3N/3N national six-engine, the consistency of delivery inspection and spot check of the engine can be improved, the fuel economy of a user in the using process is improved, and the generated economic benefit is far.

The first preset value can be a comparison value between a nitrogen and oxygen measurement value and a nitrogen and oxygen calibration value, a ratio between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value, or a ratio between a difference between the nitrogen and oxygen measurement value and the nitrogen and oxygen calibration value. The concrete setting can be carried out according to the concrete condition of the supercharger.

The nitrogen-oxygen measurement value can be used for detecting the content of nitrogen oxides in the exhaust gas in real time by using a sensor arranged at an exhaust gas outlet of the engine.

In one embodiment of the present application, the first predetermined value is a ratio of a difference between a measured value of nitrogen and oxygen and a nominal value of nitrogen and oxygen to the nominal value of nitrogen and oxygen, and an absolute value of the ratio may be controlled within a range of 1%, for example, and the measured value of nitrogen and oxygen may be considered to be approximately the same as the nominal value of nitrogen and oxygen.

In one embodiment of the present application, the processor is further configured to perform the steps of: acquiring the actual total intake air amount of the supercharger under the actual working condition; and determining whether the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value or not so as to determine whether to adjust the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine.

Whether the supercharger operates under the calibration working condition can be determined by controlling whether the comparison value of the actual air inlet total amount and the calibration air inlet total amount of the supercharger exceeds a second preset value.

In one embodiment of the present application, the processor is specifically configured to adjust the air intake and exhaust gas intake of the supercharger based on a measure of the nitrogen oxide in the exhaust gas emitted by the engine by: and when the comparison value of the actual total intake air amount and the calibrated total intake air amount of the supercharger under the calibrated working condition exceeds a second preset value, adjusting the air intake amount and the exhaust gas intake amount of the supercharger according to the measured value of the nitrogen and oxygen in the exhaust gas discharged by the engine.

When the comparison value of the actual air intake total amount and the calibrated air intake total amount of the supercharger exceeds a second preset value, the supercharger can be considered to be operated outside the calibrated working condition, at the moment, the supercharging capacity of the supercharger is reduced, and the actual air intake total amount of the supercharger cannot meet the index requirements of various parameters of the supercharger under the calibrated working condition. At this time, the air intake amount and the exhaust gas intake amount of the supercharger need to be adjusted according to the measured value of nitrogen and oxygen in the exhaust gas discharged by the engine so that the actual total intake amount meets the requirement of the engine.

It can be understood that the comparison value between the actual total intake air amount and the calibrated total intake air amount may be a difference value between the actual total intake air amount and the calibrated total intake air amount, a ratio value between the actual total intake air amount and the calibrated total intake air amount, or a ratio value between a difference value between the actual total intake air amount and the calibrated total intake air amount.

In one embodiment of the present application, the comparison value between the actual total intake air amount and the calibrated total intake air amount is a difference value between the actual total intake air amount and the calibrated total intake air amount, and the second preset value is 8-15 vol% of the calibrated total intake air amount.

In one embodiment of the present application, the processor is specifically configured to adjust the air intake and exhaust gas intake of the supercharger based on a measured value of nitrogen oxide in exhaust gas emitted from the engine: and adjusting the opening degree of an EGR valve of the engine according to the measured nitrogen and oxygen value so as to adjust the air intake quantity and the exhaust gas intake quantity of the supercharger until the comparison value of the measured nitrogen and oxygen value and the nitrogen and oxygen calibration value of the supercharger under the calibration working condition meets a first preset value.

The EGR valve is connected with the air inlet end of the supercharger and is mixed with fresh air and then is sent into the supercharger together. The EGR valve may control the amount of exhaust gas introduced into the supercharger.

Wherein the adjustment of the opening of the EGR valve may be closed loop adjusted by means of an engine control system. For example, when the EGR valve is at a certain opening degree, the measured value of the nitrogen and the oxygen is compared with a nitrogen and oxygen calibration value, and if the comparison value of the two values does not meet the requirement of a first preset value, the opening degree of the EGR valve is continuously adjusted; if the corresponding nitrogen and oxygen measured value is equal to the nitrogen and oxygen calibration value, the EGR valve can be controlled under the opening degree, and the adjustment of the opening degree of the EGR valve is completed.

Based on the same inventive concept, the present application provides a storage medium having program code stored therein, the program code being configured to, when executed, perform the steps of the method for improving the consistency of engine exhaust emissions of the embodiments of the present application.

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.