CN114810375A - Method, device, medium, equipment and vehicle for acquiring EGR rate - Google Patents

Method, device, medium, equipment and vehicle for acquiring EGR rate Download PDF

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Publication number
CN114810375A
CN114810375A CN202110751313.0A CN202110751313A CN114810375A CN 114810375 A CN114810375 A CN 114810375A CN 202110751313 A CN202110751313 A CN 202110751313A CN 114810375 A CN114810375 A CN 114810375A
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pipeline
gas
target
mass flow
exhaust gas
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CN202110751313.0A
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CN114810375B (en
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崔亚彬
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Great Wall Motor Co Ltd
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Great Wall Motor 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • F02D2041/0075—Estimating, calculating or determining the EGR rate, amount or flow by using flow sensors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The disclosure relates to a method, a device, a medium, equipment and a vehicle for obtaining an EGR rate. The method comprises the following steps: collecting the mass flow rate, pressure and temperature of waste gas in the waste gas pipeline; calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature; collecting the mass flow of air entering a mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline; calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature; and acquiring a target EGR rate according to the exhaust gas delay time, the pipeline gas delay time, the air mass flow and the exhaust gas mass flow. So that the delay times of the exhaust gas and the fresh air can be calculated and the accurate target EGR rate can be obtained according to the delay times.

Description

Method, device, medium, equipment and vehicle for acquiring EGR rate
Technical Field
The present disclosure relates to the field of vehicle control, and in particular, to a method, an apparatus, a medium, a device, and a vehicle for obtaining an EGR rate.
Background
With the rapid development of the automobile and internal combustion engine industry, the energy demand and environmental protection problems come along, so that energy conservation and emission reduction become two main subjects of the development of the internal combustion engine industry.
In this context, an Exhaust Gas Recirculation (EGR) system may be deployed in a vehicle to reduce Exhaust emissions of the vehicle and save energy. The exhaust gas recirculation is that part of exhaust gas discharged by the engine is returned to an air inlet pipe of the engine, mixed with fresh air and then enters the cylinder again, the exhaust gas contains a large amount of polyatomic gases such as CO2, and gases such as CO2 cannot be combusted but have high specific heat capacity, so that a large amount of heat can be absorbed, the maximum combustion temperature of the mixed gas in the cylinder is reduced, the generation amount of NOx can be reduced, and the exhaust emission of a vehicle is reduced; and also reduces engine fuel consumption because unburned fuel oil components in the exhaust gas participate in combustion again, etc.
In the exhaust gas recirculation process, an EGR rate is used to characterize the ratio of the amount of exhaust gas recirculated to the total amount of intake air drawn into the cylinder, and the engine needs to set the ignition advance angle according to the EGR rate in order to ensure the operating efficiency of the engine without knocking. However, since the exhaust gas recirculation system is complicated and the pipe through which exhaust gas passes is long, the EGR rate detected in the related art is not accurate enough, which may reduce the operating efficiency of the engine and even cause knocking of the engine.
Disclosure of Invention
The present disclosure is directed to a method, an apparatus and a vehicle for obtaining an EGR rate, so as to solve the technical problems in the related art.
In a first aspect, the present disclosure provides a method for obtaining an EGR rate, applied to a vehicle including an exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve connected in series, and an exhaust gas line between the EGR valve and the mixing valve, and one or more target lines between the mixing valve and the engine intake valve, the method including:
collecting the waste gas mass flow, the waste gas pressure and the waste gas temperature of the waste gas pipeline;
calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature;
collecting the mass flow of air entering the mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature;
and acquiring a target EGR rate according to the waste gas delay time, the pipeline gas delay time, the air mass flow and the waste gas mass flow.
Optionally, the calculating an exhaust gas delay time at the EGR valve based on the exhaust gas pipe volume of the exhaust gas pipe, the exhaust gas mass flow, the exhaust gas pressure, and the exhaust gas temperature comprises:
calculating the volume flow of the exhaust gas at the EGR valve according to the mass flow of the exhaust gas, the pressure of the exhaust gas and the temperature of the exhaust gas;
and calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
Optionally, the calculating a line gas delay time of each target line according to the air mass flow, the exhaust gas mass flow, and the target line volume, the line gas pressure, and the line gas temperature of each target line includes:
acquiring the total gas mass flow entering the target pipeline according to the air mass flow and the waste gas mass flow;
calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
and calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
Optionally, exhaust gas recirculation system still includes booster, intercooler and the throttle valve that connects gradually in series, the booster with the mixing valve is connected, the throttle valve with the engine intake valve is connected, one or more target pipeline include the mixing valve with first pipeline between the booster, the booster with second pipeline between the intercooler, the intercooler with third pipeline between the throttle valve, and the throttle valve with the fourth pipeline between the engine intake valve.
In a second aspect, the present disclosure provides an apparatus for obtaining an EGR rate, which is applied to a vehicle including an exhaust gas recirculation system, the exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve connected in series, and an exhaust gas line between the EGR valve and the mixing valve, and one or more target lines between the mixing valve and the engine intake valve, the apparatus including:
the waste gas pipeline parameter acquisition module is used for acquiring the waste gas mass flow, the waste gas pressure and the waste gas temperature of the waste gas pipeline;
the exhaust gas delay time calculation module is used for calculating the exhaust gas delay time of the exhaust gas pipeline according to the exhaust gas pipeline volume of the exhaust gas pipeline, the exhaust gas mass flow, the exhaust gas pressure and the exhaust gas temperature;
the target pipeline parameter acquisition module is used for acquiring the mass flow of air entering the mixing valve, the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
the target pipeline delay time calculation module is used for calculating and obtaining the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature;
and the target EGR rate acquisition module is used for acquiring a target EGR rate according to the waste gas delay time, the pipeline gas delay time, the air mass flow and the waste gas mass flow.
Optionally, the exhaust gas delay time calculation module is configured to calculate an exhaust gas volume flow at the EGR valve according to the exhaust gas mass flow, the exhaust gas pressure, and the exhaust gas temperature; and calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
Optionally, the target pipeline delay time calculation module is configured to obtain a total gas mass flow entering the target pipeline according to the air mass flow and the exhaust gas mass flow; calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline; and calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
Optionally, exhaust gas recirculation system still includes booster, intercooler and the throttle valve that connects gradually in series, the booster with the mixing valve is connected, the throttle valve with the engine intake valve is connected, one or more target pipeline include the mixing valve with first pipeline between the booster, the booster with second pipeline between the intercooler, the intercooler with third pipeline between the throttle valve, and the throttle valve with the fourth pipeline between the engine intake valve.
In a third aspect, the present disclosure provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of obtaining an EGR rate according to the first aspect of the present disclosure.
In a fourth aspect, the present disclosure provides an electronic device comprising: a memory having a computer program stored thereon; a processor for executing the computer program in the memory to implement the method of obtaining an EGR rate according to the first aspect of the present disclosure.
In a fifth aspect, the present disclosure provides a vehicle comprising: the electronic device of the fourth aspect of the present disclosure.
By adopting the technical scheme, the mass flow of the waste gas, the pressure of the waste gas and the temperature of the waste gas in the waste gas pipeline are collected; calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature; collecting the mass flow of air entering a mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline; calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature; and acquiring a target EGR rate according to the exhaust gas delay time, the pipeline gas delay time, the air mass flow and the exhaust gas mass flow. Therefore, under the condition that the pipeline of the exhaust gas recirculation system is long, the delay time of the exhaust gas and the fresh air can be calculated, and the accurate target EGR rate can be obtained according to the delay time. Further, the ignition advance angle of the engine can be reasonably set according to the target EGR rate, so that the operation efficiency of the engine can be improved, and knocking can be avoided.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
FIG. 1 is a schematic block diagram of an engine system having an exhaust gas recirculation system provided by an embodiment of the present disclosure.
Fig. 2 is a method for obtaining an EGR rate according to an embodiment of the disclosure.
Fig. 3 is a schematic structural diagram of an apparatus for obtaining an EGR rate according to an embodiment of the present disclosure.
Fig. 4 is a block diagram of an electronic device provided by an embodiment of the present disclosure.
Fig. 5 is a block diagram of a vehicle provided by an embodiment of the disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the description that follows, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.
First, an application scenario of the present disclosure will be explained. The present disclosure may be applied to control scenarios of vehicles having exhaust gas recirculation systems, particularly scenarios where an accurate EGR rate acquisition is required. Fig. 1 is a schematic structural diagram of an engine system with an exhaust gas recirculation system according to an embodiment of the present disclosure, where the engine system includes an engine body 105 and the exhaust gas recirculation system, as shown in fig. 1, and the exhaust gas recirculation system may include: an EGR valve 110, a mixing valve 101, an engine intake valve 114, an exhaust gas line between the EGR valve 110 and the mixing valve 101, and one or more target lines between the mixing valve 101 and the engine intake valve 114. Optionally, the exhaust gas recirculation system may further include: a pre-valve pressure sensor 102, a pre-volute pressure sensor 103, a throttle valve 104, a back pressure valve 106, a three-way catalyst 107, an EGR take-off pressure sensor 108, an EGR cooler 109, a differential pressure sensor 111, a supercharger 112, and an intercooler 113. In this exhaust gas recirculation system, exhaust gas is catalyzed by the three-way catalyst 107, led out, passed through the EGR cooler 109 and the EGR valve 110, mixed with fresh air at the mixing valve 101, and the mixed gas is introduced into the cylinder of the engine through the supercharger 112, the intercooler 113, the throttle valve 104, and the engine intake valve 114. By increasing the inert gas content in the air-fuel mixture in the cylinder, the maximum combustion temperature is suppressed, the NOx emission is reduced, and the fuel consumption of the engine can be reduced because the unburned fuel oil content in the exhaust gas participates in the combustion again.
The EGR rate may be used to characterize the ratio of the amount of exhaust gas recirculated to the total amount of intake air drawn into the cylinder, and the actual EGR rate is constantly changing during the operation of the vehicle, and the engine needs to set different spark advance angles according to the actual EGR rate in order to ensure the operation efficiency of the engine without knocking. In the related art, the EGR rate may be calculated by the amount of exhaust gas collected at the EGR valve and the total amount of fresh air collected at the mixing valve, but as can be seen from the structure of the exhaust gas recirculation system shown in fig. 1, the pipe through which exhaust gas and air pass is long, so that the EGR rate detected in the related art is not accurate enough to truly reflect the EGR rate entering the engine, which may reduce the operating efficiency of the engine, or even cause the engine to knock.
In order to solve the above problems, the present disclosure provides a method, an apparatus, a medium, a device, and a vehicle for obtaining an EGR rate, in which an exhaust gas delay time may be calculated from a waste pipe volume, an exhaust gas mass flow, an exhaust gas pressure, and an exhaust gas temperature, and then a pipe gas delay time of each target pipe may be calculated from target pipe volumes, air mass flows, exhaust gas mass flows, pipe gas pressures, and pipe gas temperatures of a plurality of target pipes. In this way, the actual target EGR rate is further obtained from the exhaust gas delay time and the line gas delay time of each target line. Therefore, the accurate target EGR rate can be obtained through the EGR delay time, and the ignition advance angle of the engine can be reasonably set according to the target EGR rate, so that the running efficiency of the engine can be improved, and knocking is avoided.
Fig. 2 is a method for obtaining an EGR rate according to an embodiment of the present disclosure, which may be applied to a vehicle that may include an exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve in series, and one or more target lines between the EGR valve and the mixing valve and between the mixing valve and the engine intake valve, as shown in fig. 2, the method including:
s201, collecting the mass flow of the waste gas, the pressure of the waste gas and the temperature of the waste gas in a waste gas pipeline.
For example, the exhaust gas mass flow into the exhaust gas line can be picked up by an air flow meter arranged at the EGR valve; acquiring the temperature of the exhaust gas in the exhaust gas pipeline through a temperature sensor arranged in the EGR valve or the exhaust gas pipeline; the exhaust gas pressure in the exhaust gas line is detected by a pressure sensor arranged in the EGR valve or in the exhaust gas line.
S202, calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature.
S203, collecting the air mass flow entering the mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline.
Likewise, the mass flow of air entering the mixing valve can be collected by an air flow meter arranged at the mixing valve; acquiring the temperature of the pipeline gas in each target pipeline through a temperature sensor arranged in the target pipeline; and acquiring the pipeline gas pressure in each target pipeline through a pressure sensor arranged in the target pipeline.
And S204, calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature.
And S205, acquiring a target EGR rate according to the exhaust gas delay time, the pipeline gas delay time, the air mass flow and the exhaust gas mass flow.
Illustratively, adding the exhaust gas delay time and the line gas delay time for each target line may result in a total EGR delay time for the exhaust gas from the EGR valve to the engine intake valve. The first EGR rate can be obtained by the exhaust gas mass flow measured at the EGR valve and the air mass flow collected at the mixing valve, and the first EGR rate at the current time can be used as the target EGR rate corresponding to the EGR delay time, that is, the actual EGR rate corresponding to the EGR delay time.
Further, in the EGR delay time, the ignition advance angle of the engine can be reasonably set according to the target EGR rate, so that the operation efficiency of the engine can be improved, and knocking can be avoided.
By adopting the method, the mass flow of the waste gas, the pressure of the waste gas and the temperature of the waste gas in the waste gas pipeline are collected; calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature; collecting the mass flow of air entering a mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline; calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature; and acquiring a target EGR rate according to the exhaust delay time, the pipeline gas delay time, the air mass flow and the exhaust mass flow. Therefore, under the condition that the pipeline of the exhaust gas recirculation system is long, the delay time of the exhaust gas and the fresh air can be calculated, and the accurate target EGR rate can be obtained according to the delay time. Further, the ignition advance angle of the engine can be reasonably set according to the target EGR rate, so that the operation efficiency of the engine can be improved, and knocking can be avoided.
Further, the step S202 of calculating the exhaust gas delay time of the exhaust gas pipeline may include the steps of:
first, the exhaust gas volume flow at the EGR valve is calculated from the exhaust gas mass flow, the exhaust gas pressure and the exhaust gas temperature.
For example, the exhaust gas volumetric flow at the EGR valve may be calculated by the following equation:
V s0 ＝N1*R*T 0 /P 0 ；
wherein, V s0 Representing the above-mentioned exhaust gas volume flow, N1 representing the exhaust gas mass flow, T 0 Representing the exhaust gas temperature, P 0 Representing the exhaust gas pressure and R representing the gas constant, R may be, for example, 0.0814 atm · l/mol · K.
Further, the exhaust gas mass flow rate may be obtained from the opening degree of the EGR valve and the differential pressure across the EGR valve, which may be measured by the differential pressure sensor 111 in the exhaust gas recirculation system. The measurement result of the exhaust gas mass flow rate may be stored in an ECU (Electronic Control Unit) of the vehicle for calculation use in the present embodiment.
And secondly, calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
For example, the exhaust delay time may be calculated by the following formula:
t 0 ＝V 0 /V s0 ；
wherein, t 0 Represents the above-mentioned exhaust gas delay time, V 0 Indicating exhaust gas line volume, V s0 Representing the exhaust gas volumetric flow. The exhaust gas line volume may be a volume preset according to the structure of the exhaust gas recirculation system.
Therefore, the exhaust gas delay time of the exhaust gas pipeline can be accurately calculated according to the exhaust gas pipeline volume of the exhaust gas pipeline, the exhaust gas mass flow, the exhaust gas pressure and the exhaust gas temperature, and therefore the accurate target EGR rate is obtained.
Further, the step of calculating the pipeline gas delay time of each target pipeline in the step of S204 may include the following steps:
first, the total gas mass flow entering the target line is obtained from the air mass flow and the exhaust gas mass flow.
For example, the sum of the air mass flow and the exhaust gas mass flow may be taken as the total gas mass flow into the target circuit.
And secondly, calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline.
For example, the volumetric flow rate of the pipeline gas for each target pipeline may be calculated by the following formula:
V sn ＝N2*R*T n /P n ；
wherein, V sn Indicating a line gas volume flow of an nth target line of the one or more target lines, and N2 indicating the total gasMass flow rate, Tn represents the line gas temperature of the nth target line, Pn represents the line gas pressure of the nth target line, and R represents a gas constant, which may be 0.0814 atm · l/mol · K, for example.
And finally, calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
For example, the line gas delay time for each target line may be calculated by the following equation:
t n ＝V n /V sn ；
wherein, t n Indicating a line gas delay time, V, of an nth target line of the one or more target lines n Represents the target line volume, V, of the nth target line sn Indicating the line gas volume flow for the nth target line. The target line volume may be a volume preset according to the structure of the exhaust gas recirculation system.
Therefore, the pipeline gas delay time of each target pipeline can be accurately calculated according to the air mass flow, the exhaust gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature, and therefore the accurate target EGR rate is obtained.
In another embodiment of the present disclosure, the exhaust gas recirculation system further includes a supercharger, an intercooler, and a throttle valve connected in series in this order, the supercharger being connected with the mixing valve, the throttle valve being connected with the engine intake valve, the plurality of target lines including a first line between the mixing valve and the supercharger, a second line between the supercharger and the intercooler, a third line between the intercooler and the throttle valve, and a fourth line between the throttle valve and the engine intake valve.
In the present embodiment, the pipeline of the engine system with the exhaust gas recirculation system is divided into 5 parts in total, and the method comprises the following steps: an exhaust gas line between the EGR valve to the mixing valve, a first line between the mixing valve to the supercharger, a second line between the supercharger to the intercooler, a third line between the intercooler to the throttle valve, and a fourth line between the throttle valve to the engine intake valve.
It should be noted that, in the first to fourth pipelines, the total gas mass flow formed by mixing the exhaust gas and the fresh air is the same, but since the pipeline gas pressure and the pipeline gas temperature in different target pipelines are different, the pipeline gas pressure and the pipeline gas temperature in each target pipeline can be acquired, so that the accurate calculation of the pipeline gas delay time of each target pipeline can be realized, and a more accurate target EGR rate can be obtained.
Fig. 3 is a schematic structural diagram of an apparatus for obtaining an EGR rate according to an embodiment of the present disclosure, which may be applied to a vehicle including an exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve in series, and an exhaust gas line between the EGR valve and the mixing valve, and one or more target lines between the mixing valve and the engine intake valve, as shown in fig. 3, and includes:
the waste gas pipeline parameter acquisition module 301 is used for acquiring the waste gas mass flow, the waste gas pressure and the waste gas temperature of the waste gas pipeline;
an exhaust delay time calculation module 302, configured to calculate an exhaust delay time of the exhaust pipeline according to an exhaust pipeline volume of the exhaust pipeline, the exhaust mass flow, the exhaust pressure, and the exhaust temperature;
a target pipeline parameter acquisition module 303, configured to acquire a mass flow rate of air entering the mixing valve, and a pipeline gas pressure and a pipeline gas temperature of each target pipeline;
a target pipeline delay time calculation module 304, configured to calculate a pipeline gas delay time of each target pipeline according to the air mass flow, the exhaust gas mass flow, and a target pipeline volume, the pipeline gas pressure, and the pipeline gas temperature of each target pipeline;
a target EGR rate obtaining module 305 for obtaining a target EGR rate according to the exhaust gas delay time, the line gas delay time, the air mass flow and the exhaust gas mass flow.
Optionally, the exhaust gas delay time calculation module 302 is configured to calculate an exhaust gas volume flow at the EGR valve according to the exhaust gas mass flow, the exhaust gas pressure, and the exhaust gas temperature; and calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
Optionally, the target pipeline delay time calculation module 304 is configured to obtain a total gas mass flow entering the target pipeline according to the air mass flow and the exhaust gas mass flow; calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline; and calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
Optionally, the exhaust gas recirculation system further comprises a supercharger, an intercooler and a throttle valve connected in series in sequence, the supercharger is connected with the mixing valve, the throttle valve is connected with the engine intake valve, and the plurality of target pipelines comprise a first pipeline between the mixing valve and the supercharger, a second pipeline between the supercharger and the intercooler, a third pipeline between the intercooler and the throttle valve, and a fourth pipeline between the throttle valve and the engine intake valve.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 4 is a block diagram illustrating an electronic device 400 according to an example embodiment. As shown in fig. 4, the electronic device 400 may include: a processor 401 and a memory 402. The electronic device 400 may also include one or more of a multimedia component 403, an input/output (I/O) interface 404, and a communication component 405.
Wherein, the processor 401 is configured to control the overall operation of the electronic device 400 to complete all or part of the steps of the method for obtaining the EGR rate. The memory 402 is used to store various types of data to support operation at the electronic device 400, such as instructions for any application or method operating on the electronic device 400 and application-related data, such as contact data, transmitted and received messages, pictures, audio, video, and the like. The Memory 402 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The multimedia components 403 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 402 or transmitted through the communication component 405. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 404 provides an interface between the processor 401 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 405 is used for wired or wireless communication between the electronic device 400 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, 5G, NB-IOT, eMTC, or other 6G, or a combination of one or more of them, which is not limited herein. The corresponding communication component 405 may therefore include: Wi-Fi module, bluetooth module, NFC module etc..
In an exemplary embodiment, the electronic Device 400 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described method of obtaining the EGR rate.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the above-described method of obtaining an EGR rate is also provided. For example, the computer readable storage medium may be the memory 402 described above including program instructions executable by the processor 401 of the electronic device 400 to perform the method of obtaining an EGR rate described above.
Fig. 5 is a block diagram of a vehicle provided in an embodiment of the present disclosure, and as shown in fig. 5, the vehicle includes: the electronic device 400 described above.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A method of obtaining an EGR rate, applied to a vehicle including an exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve in series, and an exhaust gas line between the EGR valve and the mixing valve, and one or more target lines between the mixing valve and the engine intake valve, the method comprising:
collecting the waste gas mass flow, the waste gas pressure and the waste gas temperature of the waste gas pipeline;
calculating the waste gas delay time of the waste gas pipeline according to the waste gas pipeline volume of the waste gas pipeline, the waste gas mass flow, the waste gas pressure and the waste gas temperature;
collecting the mass flow of air entering the mixing valve, and the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
calculating the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature;
and acquiring a target EGR rate according to the waste gas delay time, the pipeline gas delay time, the air mass flow and the waste gas mass flow.
2. The method of obtaining an EGR rate as claimed in claim 1, wherein said calculating an exhaust gas delay time at an EGR valve from an exhaust gas line volume of the exhaust gas line, the exhaust gas mass flow, the exhaust gas pressure, and the exhaust gas temperature comprises:
calculating the volume flow of the exhaust gas at the EGR valve according to the mass flow of the exhaust gas, the pressure of the exhaust gas and the temperature of the exhaust gas;
and calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
3. The method of obtaining an EGR rate according to claim 1, wherein said calculating a line gas delay time for each target line based on the air mass flow, the exhaust gas mass flow, and a target line volume, the line gas pressure, and the line gas temperature for each target line comprises:
acquiring the total gas mass flow entering the target pipeline according to the air mass flow and the waste gas mass flow;
calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
and calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
4. The method of obtaining an EGR rate according to any one of claims 1 to 3, wherein the exhaust gas recirculation system further includes a supercharger, an intercooler, and a throttle valve connected to the engine intake valve in series in this order, the supercharger being connected to the mixing valve, the throttle valve being connected to the engine intake valve, and the plurality of target lines include a first line between the mixing valve and the supercharger, a second line between the supercharger and the intercooler, a third line between the intercooler and the throttle valve, and a fourth line between the throttle valve and the engine intake valve.
5. An apparatus for obtaining an EGR rate, applied to a vehicle including an exhaust gas recirculation system including an EGR valve, a mixing valve, and an engine intake valve connected in series in this order, and an exhaust gas line between the EGR valve and the mixing valve, and one or more target lines between the mixing valve and the engine intake valve, the apparatus comprising:
the waste gas pipeline parameter acquisition module is used for acquiring the waste gas mass flow, the waste gas pressure and the waste gas temperature of the waste gas pipeline;
the exhaust gas delay time calculation module is used for calculating the exhaust gas delay time of the exhaust gas pipeline according to the exhaust gas pipeline volume of the exhaust gas pipeline, the exhaust gas mass flow, the exhaust gas pressure and the exhaust gas temperature;
the target pipeline parameter acquisition module is used for acquiring the mass flow of air entering the mixing valve, the pipeline gas pressure and the pipeline gas temperature of each target pipeline;
the target pipeline delay time calculation module is used for calculating and obtaining the pipeline gas delay time of each target pipeline according to the air mass flow, the waste gas mass flow, the target pipeline volume of each target pipeline, the pipeline gas pressure and the pipeline gas temperature;
and the target EGR rate acquisition module is used for acquiring a target EGR rate according to the waste gas delay time, the pipeline gas delay time, the air mass flow and the waste gas mass flow.
6. The apparatus for obtaining the EGR rate according to claim 5, wherein the exhaust gas delay time calculation module is configured to calculate an exhaust gas volume flow at an EGR valve according to the exhaust gas mass flow, the exhaust gas pressure, and the exhaust gas temperature; and calculating the waste gas delay time according to the waste gas pipeline volume of the waste gas pipeline and the waste gas volume flow.
7. The apparatus for obtaining an EGR rate according to claim 5, wherein the target line delay time calculation module is configured to obtain a total gas mass flow rate into the target line based on the air mass flow rate and the exhaust gas mass flow rate; calculating to obtain the pipeline gas volume flow of each target pipeline according to the total gas mass flow, the pipeline gas pressure and the pipeline gas temperature of each target pipeline; and calculating the pipeline gas delay time of each target pipeline according to the target pipeline volume of each target pipeline and the pipeline gas volume flow.
8. A computer-readable storage medium on which a computer program is stored, the program being characterized by implementing the method of obtaining an EGR rate of any one of claims 1 to 4 when executed by a processor.
9. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the method of obtaining an EGR rate of any of claims 1-4.
10. A vehicle characterized in that the vehicle comprises the electronic device of claim 9.
CN202110751313.0A 2021-07-02 2021-07-02 Method, device, medium, equipment and vehicle for acquiring EGR rate Active CN114810375B (en)

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