CN111042956B - EGR flow fault judgment method, device and equipment - Google Patents
EGR flow fault judgment method, device and equipment Download PDFInfo
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- CN111042956B CN111042956B CN201911364095.4A CN201911364095A CN111042956B CN 111042956 B CN111042956 B CN 111042956B CN 201911364095 A CN201911364095 A CN 201911364095A CN 111042956 B CN111042956 B CN 111042956B
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- 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
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
Abstract
The embodiment of the application provides a method, a device and equipment for judging EGR flow faults, wherein the method comprises the following steps: determining a correction coefficient according to a NOx emission set value and a NOx emission measured value of a target engine; obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold; determining a deviation of a flow parameter of the target engine based on the measured quantity of the flow parameter and the set quantity of the flow parameter, wherein the flow parameter includes at least one of an intake air quantity and an exhaust gas quantity; and judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold, wherein the judgment of the flow faults of the EGR considers the NOx emission of the engine and further considers the influence of boundary conditions on the emission change of the original engine, the problem of false alarm or false alarm caused by inaccurate judgment of the EGR flow faults in the prior art is solved, and the fault monitoring robustness is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of vehicles, in particular to a method, a device and equipment for judging flow faults of Exhaust Gas recirculation (EGR for short).
Background
With the continuous development of economy, vehicles have become an important vehicle for people to go out. The vehicle brings convenience to people, but the exhaust gas discharged by the vehicle pollutes the environment. The vehicle may return a portion of the exhaust gas from the engine to the intake manifold via the EGR device of the engine and re-enter the cylinders with fresh air. Because the waste gas contains a large amount of CO2And the like, which can absorb a large amount of heat to lower the maximum combustion temperature of the mixed gas in the cylinder, thereby reducing the generation amount of nitrogen oxides and reducing the pollution to the environment. Too high EGR flow can affect engine performance or cause excessive particulate matter emission; excessive EGR flow can lead to excessive NOx emissions, and therefore, the need for timely deliveryAnd judging whether the EGR has a flow fault or not.
Currently, the art generally monitors EGR flow fault through a system of intake air flow closed-loop control, that is, monitors deviation between an intake air amount set value and an intake air amount measured value, the deviation is normal within a limit value range, and the EGR flow is considered to be too high or too low when the deviation exceeds the limit value. The limit value range is obtained by fixing the EGR opening degree to the EGR closed-loop output opening degree after the air intake amount of each operating point is closed-loop stabilized and simulating the failure mode of EGR flow reduction by gradually reducing the EGR opening degree.
However, after the engine is matched with the whole vehicle, the EGR flow fault in the above detection method is not accurately determined due to the influence of boundary conditions such as air filter, intercooler, exhaust pipe, and environment on the change of the original engine emission, so that the problems of false alarm or false alarm may exist.
Disclosure of Invention
The embodiment of the application provides a method, a device and equipment for judging an EGR flow fault, and aims to solve the problem of false alarm or wrong report caused by inaccurate judgment of the EGR flow fault in the prior art.
In a first aspect, an embodiment of the present application provides an EGR flow fault determining method, including:
determining a correction coefficient according to a NOx emission set value and a NOx emission measured value of a target engine;
obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold;
determining a deviation of a flow parameter of the target engine based on the measured quantity of the flow parameter and the set quantity of the flow parameter, wherein the flow parameter includes at least one of an intake air quantity and an exhaust gas quantity;
and judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
In one possible design, the target deviation threshold includes a first target deviation threshold and a second target deviation threshold;
the judging whether the EGR of the target engine has flow fault according to the deviation of the flow parameter and the target deviation threshold value comprises the following steps:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
In one possible design, the obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold includes:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value.
In one possible design, further comprising:
if the EGR of the target engine has flow faults, acquiring the duration of the flow faults of the EGR of the target engine;
comparing the duration to a preset time threshold;
and if the duration reaches the preset time threshold, sending prompt information to preset personnel, wherein the prompt information is used for informing the preset personnel that the flow fault exists in the EGR of the target engine.
In a second aspect, an embodiment of the present application provides an EGR flow fault determination device, including:
a first determination module for determining a correction factor based on a NOx emission set point and a NOx emission measurement for a target engine;
the obtaining module is used for obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold;
a second determination module for determining a deviation of a flow parameter of the target engine based on the measured quantity of the flow parameter and a set quantity of the flow parameter, wherein the flow parameter includes at least one of an intake air quantity and an exhaust gas quantity;
and the judging module is used for judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
In one possible design, the target deviation threshold includes a first target deviation threshold and a second target deviation threshold;
the determining module determines whether the EGR of the target engine has a flow fault according to the deviation of the flow parameter and the target deviation threshold, including:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
In one possible design, the obtaining module obtains a target deviation threshold according to the correction coefficient and a preset deviation threshold, and includes:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value.
In one possible design, further comprising:
the obtaining module is used for obtaining the duration of the EGR of the target engine with the flow fault if the EGR of the target engine has the flow fault;
the comparison module is used for comparing the duration with a preset time threshold;
and the sending module is used for sending prompt information to preset personnel if the duration reaches the preset time threshold, wherein the prompt information is used for informing the preset personnel that the flow fault exists in the EGR of the target engine.
In a third aspect, an embodiment of the present application provides an EGR flow fault determining apparatus, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the EGR flow fault determination method as described above in the first aspect and various possible designs of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, where computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for determining an EGR flow fault according to the first aspect and various possible designs of the first aspect is implemented.
According to the EGR flow fault judgment method, the device and the equipment provided by the embodiment of the application, the correction coefficient reflecting NOx emission can be determined through the NOx emission set value and the NOx emission measured value of the target engine; according to the correction coefficient and a preset deviation threshold value, a target deviation threshold value based on the original machine emission level is obtained; the deviation of the flow parameter can be accurately determined according to the measured quantity of the flow parameter and the set quantity of the flow parameter; according to the deviation of the flow parameter and the target deviation threshold value, whether the EGR of the target engine has flow faults or not can be accurately judged, wherein the judgment of the flow faults of the EGR considers the NOx emission amount of the engine, further considers the influence of boundary conditions such as an air filter, an intercooler, an exhaust pipeline and the environment on the emission change of an original engine, solves the problem of false alarm or false alarm caused by inaccurate judgment of the EGR flow faults in the prior art, and improves the fault monitoring robustness.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an EGR flow fault determination system according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a method for determining an EGR flow fault according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating another method for determining an EGR flow fault according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an EGR flow fault determination device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another EGR flow fault determination device according to an embodiment of the present application;
fig. 6 is a schematic diagram of a hardware structure of an EGR flow fault determination device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but 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.
Too high EGR flow can influence engine performance, or lead to particulate matter emission to exceed standard, and too low EGR flow can lead to nitrogen oxide emission to exceed standard, consequently, need in time judge EGR whether have the flow trouble. Currently, the art generally monitors EGR flow fault through a system of intake air flow closed-loop control, that is, monitors deviation between an intake air amount set value and an intake air amount measured value, the deviation is normal within a limit value range, and the EGR flow is considered to be too high or too low when the deviation exceeds the limit value. The limit value range is obtained by fixing the EGR opening degree to the EGR closed-loop output opening degree after the air intake amount of each operating point is closed-loop stabilized and simulating the failure mode of EGR flow reduction by gradually reducing the EGR opening degree.
However, after the engine is matched with the whole vehicle, the EGR flow fault in the above detection method is not accurately determined due to the influence of boundary conditions such as air filter, intercooler, exhaust pipe, and environment on the change of the original engine emission, so that the problems of false alarm or false alarm may exist.
Therefore, in view of the above problems, the present embodiment provides an EGR flow rate failure determination method, apparatus and device. According to the method, a correction coefficient reflecting NOx emission can be determined through a NOx emission set value and a NOx emission measured value of a target engine; according to the correction coefficient and a preset deviation threshold value, a target deviation threshold value based on the original machine emission level is obtained; the deviation of the flow parameter can be accurately determined according to the measured quantity of the flow parameter and the set quantity of the flow parameter; according to the deviation of the flow parameter and the target deviation threshold value, whether the EGR of the target engine has flow faults or not can be accurately judged, wherein the judgment of the flow faults of the EGR considers the NOx emission of the engine, further considers the influence of boundary conditions such as an air filter, an intercooler, an exhaust pipeline and the environment on the emission change of an original engine, and solves the problem of false alarm or false alarm caused by inaccurate judgment of the EGR flow faults in the prior art.
The present embodiment provides an EGR flow fault determining method, which may be applied to the schematic architecture diagram of the EGR flow fault determining system shown in fig. 1, where as shown in fig. 1, the system provided in the present embodiment includes at least one of a memory, a display, and a processor.
The memory can store information such as a target deviation threshold value and the like;
the display may display process information such as correction factors or deviations in flow parameters.
The processor may determine a correction factor based on a NOx emission setpoint and a NOx emission measurement for the target engine; a target deviation threshold value can be obtained according to the correction coefficient and a preset deviation threshold value; or determining the deviation of the flow parameter according to the measured quantity of the flow parameter of the target engine and the set quantity of the flow parameter; meanwhile, whether the EGR of the target engine has flow faults or not can be judged according to the deviation of the flow parameters and the target deviation threshold value.
The implementation of the EGR flow rate failure determination system in the present embodiment is not particularly limited, and may be, for example, an Electronic Control Unit (ECU). The target engine is an engine to be detected whether an EGR flow fault exists, and is an energy conversion device of a vehicle, and can interact with an EGR flow fault judgment system.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 2 is a schematic flow chart of an EGR flow fault determining method according to an embodiment of the present application, and an execution subject of the present embodiment may be a processor in the EGR flow fault determining system according to the embodiment shown in fig. 1. As shown in fig. 2, the method may include:
s201: a correction factor is determined based on the NOx emission setpoint and the NOx emission measurement for the target engine.
The target engine is an engine which needs to judge whether an EGR flow fault exists or not.
The setting value of the NOx emission setting value in the embodiment of the present application is not specifically limited, and may be set according to an actual application scenario.
Illustratively, a measured value of NOx emissions of the target engine, i.e., an actual amount of NOx emissions, is obtained; and acquiring a NOx emission set value of the target engine under the same engine speed and circulating oil supply quantity, and determining a correction coefficient according to the set value and the actual emission quantity. The correction coefficient can be determined by a method of verifying an actual road of the whole vehicle and/or calibrating a virtual calibration of the whole vehicle, for example: the emission states under different boundary conditions are simulated by a virtual calibration method of the whole vehicle, a correction model is trained through a NOx emission set value, a NOx emission measured value and a correction coefficient, the NOx emission set value and the NOx emission measured value are input into the correction model, and the correction coefficient can be output. It can be understood that the NOx emission set value and the NOx emission measured value are under the same working condition of the engine speed and the circulating fuel supply amount, and the obtained correction coefficient is more reasonable only for enabling the NOx emission set value and the NOx emission measured value to correspond.
S202: and obtaining a target deviation threshold value according to the correction coefficient and a preset deviation threshold value.
Optionally, the target deviation threshold comprises a first target deviation threshold and a second target deviation threshold. For example, the preset deviation threshold value includes a first preset deviation threshold value corresponding to an intake air amount and a second preset deviation threshold value corresponding to an exhaust gas amount, and the target deviation threshold value includes a first target deviation threshold value corresponding to the first preset deviation threshold value and a second target deviation threshold value corresponding to the second preset deviation threshold value.
For example, the intake air amount refers to an intake air amount of fresh air in an intake system of the target engine, excluding the EGR flow amount; the amount of exhaust gas refers to the amount of exhaust gas introduced into the intake system by the target engine through the EGR system, that is, the EGR flow rate.
The first preset deviation threshold and the second preset deviation threshold may be set according to an actual application scenario, and may be the same as or different from each other, and in a general case, the first preset deviation threshold and the second preset deviation threshold are different from each other. For example, taking the ECU as an example, the memory of the ECU stores the correspondence relationship between the engine speed, the circulating fuel supply amount, and the first preset deviation threshold corresponding to the intake air amount of the target engine is determined based on the actual engine speed and the circulating fuel supply amount of the target engine.
Optionally, the obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold includes:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value. For example, the correction coefficient is C, the first preset deviation threshold is T1, the second preset deviation threshold is T2, and the first target deviation threshold a1 is C × T1; the second target deviation threshold a2 ═ C × T2.
S203: determining a deviation of the flow parameter based on the measured quantity of the flow parameter and the set quantity of the flow parameter of the target engine, wherein the flow parameter includes at least one of an intake air quantity and an exhaust gas quantity.
The set amount of the flow parameter may be set according to an actual application scenario, and may be, for example, a flow parameter of the target engine at an ideal performance and an emission level.
Alternatively, the above-mentioned determining the deviation of the flow parameter from the measured quantity of the flow parameter of the target engine and the set quantity of the flow parameter may be achieved by, but is not limited to:
the deviation of the flow parameter is determined based on a difference between a set amount of the flow parameter and a measured amount of the flow parameter of the target engine. For example: the setting quantity of the air inlet quantity of the target engine is I1, the measuring quantity of the air inlet quantity is I2, and the deviation Delta I of the air inlet quantity is I1-I2; the set amount of the exhaust gas amount of the target engine is E1, the measured amount of the exhaust gas amount is E2, and the deviation Δ E of the exhaust gas amount is E1 to E2.
The present embodiment is not limited to the manner of obtaining the set amount of the flow parameter, and for example, an ECU is taken as an example, a correspondence relationship between the engine speed, the amount of circulating fuel and the set amount of the flow parameter is stored in a memory of the ECU, and a set value of the flow parameter corresponding to the intake air amount of the target engine is determined based on the actual engine speed and the amount of circulating fuel of the target engine.
S204: and judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
Optionally, the determining whether there is a flow fault in the EGR of the target engine according to the deviation of the flow parameter and the target deviation threshold includes:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
It is understood that the deviation of the intake air amount has a positive value or a negative value, and the first target deviation threshold value includes a first large fault threshold value corresponding to when the deviation of the intake air amount is a positive value and a first small fault threshold value corresponding to when the deviation of the intake air amount is a negative value; likewise, the second target deviation threshold includes a second small deviation threshold corresponding to when the deviation of the amount of exhaust gas is a positive value, and a second large deviation threshold corresponding to when the deviation of the amount of exhaust gas is a negative value.
Illustratively, when the deviation of the intake air amount is Δ I1If Δ I1If the set quantity of the air inflow is larger than the measured quantity of the air inflow, the EGR of the target engine has a fault with larger flow, and the first threshold of the fault is I1If Δ I1≥I1And the difference between the set quantity of the air inflow and the measured quantity of the air inflow is not in a reasonable range, so that the EGR of the target engine is judged to have a fault of overlarge flow. When the deviation of the intake air amount is Δ I2If Δ I2< 0, which indicates that the set amount of intake air is smaller than the measured amount of intake air, the EGR of the target engine may have a flow rate bias fault, and the first bias fault threshold is I2If | Δ I2|≥I2The setting of the intake air amount is explainedThe difference between the measured quantity of the quantity and the measured quantity of the air inflow is not in a reasonable range, so that the EGR of the target engine is judged to have a fault of small flow. In the present embodiment, the first large fault threshold I1And a first partial fault threshold I2Are all positive values, and can be according to the practical application scene1And I2The specific numerical value of (2) is set.
Deviation of exhaust gas amount is Δ E1If Δ E1If the set quantity of the exhaust gas is larger than the measured quantity of the exhaust gas, the target engine has the possibility that the EGR has a flow rate smaller fault, and the second smaller fault threshold is E1If Δ E1≥E1It is explained that the difference between the set amount of the exhaust gas amount and the measured amount of the exhaust gas amount is not within a reasonable range, and therefore, it is determined that there is a failure that the flow rate of EGR of the target engine is slightly small. Deviation of exhaust gas amount is Δ E2If Δ E2< 0, indicating that the set amount of exhaust gas is less than the measured amount of exhaust gas, that the target engine has a potential for EGR with an excessive flow fault, and that the second excessive fault threshold is E2If | Δ E2|≥E2It is explained that the difference between the set amount of the exhaust gas amount and the measured amount of the exhaust gas amount is not within a reasonable range, and therefore, it is determined that there is a failure that the EGR flow rate of the target engine is excessively large. The second small fault threshold E1And a second, larger fault threshold E2Are all positive values, and can be according to the practical application scene1And E2The specific numerical value of (2) is set.
It is understood that if the above flow parameters include an intake air amount and an exhaust gas amount, it is possible to determine whether the deviation of the intake air amount reaches the first target deviation threshold value and determine whether the deviation of the exhaust gas amount reaches the second target deviation threshold value;
and if the deviation of the air intake amount reaches the first target deviation threshold value and the deviation of the exhaust gas amount reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
Of course, the EGR rate may be calculated from the amount of exhaust gas, or the above-described scheme may determine whether there is a flow rate failure in EGR of the target engine based on the EGR rate.
According to the EGR flow fault judgment method provided by the embodiment of the application, the correction coefficient reflecting the NOx emission can be determined through the NOx emission set value and the NOx emission measured value of the target engine; according to the correction coefficient and a preset deviation threshold value, a target deviation threshold value based on the original machine emission level is obtained; the deviation of the flow parameter can be accurately determined according to the measured quantity of the flow parameter and the set quantity of the flow parameter; according to the deviation of the flow parameter and the target deviation threshold value, whether the EGR of the target engine has flow faults or not can be accurately judged, wherein the judgment of the flow faults of the EGR considers the NOx emission of the engine, further considers the influence of boundary conditions such as an air filter, an intercooler, an exhaust pipeline and the environment on the emission change of an original engine, and solves the problem of false alarm or false alarm caused by inaccurate judgment of the EGR flow faults in the prior art.
Fig. 3 is a schematic flow chart of another EGR flow fault determining method according to an embodiment of the present disclosure, and an execution subject of the present embodiment may be the processor in the embodiment shown in fig. 1. As shown in fig. 3, the method includes:
s301: a correction factor is determined based on the NOx emission setpoint and the NOx emission measurement for the target engine.
S302: and obtaining a target deviation threshold value according to the correction coefficient and a preset deviation threshold value.
S303: determining a deviation of the flow parameter based on the measured quantity of the flow parameter and the set quantity of the flow parameter of the target engine, wherein the flow parameter includes at least one of an intake air quantity and an exhaust gas quantity.
S304: and judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
The steps S301 to S304 are the same as the steps S201 to S204, and are not described herein again.
Optionally, after determining whether the flow fault exists in the EGR of the target engine, the method further includes:
s305: and if the EGR of the target engine has the flow fault, acquiring the duration of the flow fault of the EGR of the target engine.
Illustratively, an EGR state of 1 indicates that there is a low flow fault in EGR, an EGR state of 0 indicates that there is no flow fault in EGR, and a duration of an EGR state of 1 is obtained. For example, from time T1, the EGR state changes from 0 to 1, from time T2, the EGR state changes from 1 to 0, and between T1 and T2, the EGR state remains 1, and the duration Δ T of the EGR flow failure is T2 to T1.
S306: comparing the duration to a preset time threshold.
The preset time threshold may be set according to an actual application scenario, and in an application scenario with a strict demand on the EGR flow, the preset time threshold may be set to be smaller.
S307: and if the duration reaches the preset time threshold, sending prompt information to preset personnel, wherein the prompt information is used for informing the preset personnel that the flow fault exists in the EGR of the target engine.
Illustratively, if the time reaches the preset time threshold, the duration of the flow fault existing in the EGR of the target engine is longer, and the duration reaches the set value, so that a prompt message needs to be sent to a preset person, the preset person can timely process the flow fault existing in the EGR of the target engine according to the prompt message, and the nitrogen oxide emission exceeding caused by too low EGR flow is avoided; too high EGR flow affects engine performance or results in smoke level particulate emissions exceeding standards.
According to the EGR flow fault judgment method provided by the embodiment of the application, the correction coefficient reflecting the NOx emission can be determined through the NOx emission set value and the NOx emission measured value of the target engine; according to the correction coefficient and a preset deviation threshold value, a target deviation threshold value based on the original machine emission level is obtained; the deviation of the flow parameter can be accurately determined according to the measured quantity of the flow parameter and the set quantity of the flow parameter; according to the deviation of the flow parameter and the target deviation threshold value, whether the EGR of the target engine has flow faults or not can be accurately judged, wherein the judgment of the flow faults of the EGR considers the NOx emission of the engine, further considers the influence of boundary conditions such as an air filter, an intercooler, an exhaust pipeline and the environment on the emission change of an original engine, and solves the problem of false alarm or false alarm caused by inaccurate judgment of the EGR flow faults in the prior art; if the EGR of the target engine has flow faults, obtaining the duration time of the EGR of the target engine with the flow faults, and if the duration time reaches a preset time threshold value, indicating that the duration time of the EGR of the target engine with the flow faults is longer, sending prompt information to preset personnel so that the preset personnel can timely process the EGR of the target engine with the flow faults according to the prompt information, and avoiding the excessive emission of nitrogen oxides caused by too low EGR flow; too high EGR flow affects engine performance or results in smoke level particulate emissions exceeding standards.
Fig. 4 is a schematic structural diagram of an EGR flow fault determining apparatus according to an embodiment of the present application, corresponding to the EGR flow fault determining method according to the foregoing embodiment. For convenience of explanation, only portions related to the embodiments of the present application are shown. As shown in fig. 4, the EGR flow rate failure determination device 40 includes: a first determining module 401, an obtaining module 402, a second determining module 403 and a judging module 404.
A first determination module 401 for determining a correction factor based on a NOx emission setpoint and a NOx emission measurement for a target engine;
an obtaining module 402, configured to obtain a target deviation threshold according to the correction coefficient and a preset deviation threshold;
a second determination module 403 for determining a deviation of a flow parameter of the target engine based on the measured quantity of the flow parameter and the set quantity of the flow parameter, wherein the flow parameter comprises at least one of an intake air quantity and an exhaust gas quantity;
a determining module 404, configured to determine whether there is a flow fault in the EGR of the target engine according to the deviation of the flow parameter and the target deviation threshold.
The apparatus provided in the embodiment of the present application may be configured to implement the technical solution of the method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again in the embodiment of the present application.
Fig. 5 is a schematic structural diagram of another EGR flow fault determination device according to an embodiment of the present application. As shown in fig. 5, the EGR flow rate failure determination device 50 according to the present embodiment further includes, in addition to the embodiment shown in fig. 4: an acquisition module 405, a comparison module 406 and a sending module 407.
Optionally, the target deviation threshold comprises a first target deviation threshold and a second target deviation threshold;
the determining module 404 determines whether the EGR of the target engine has a flow fault according to the deviation of the flow parameter and the target deviation threshold, including:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
Optionally, the obtaining module 402 obtains a target deviation threshold according to the correction coefficient and a preset deviation threshold, including:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value.
Optionally, the obtaining module 405 is configured to obtain a duration of the flow fault of the EGR of the target engine if the flow fault of the EGR of the target engine exists;
a comparison module 406, configured to compare the duration with a preset time threshold;
a sending module 407, configured to send a prompt message to a preset person if the duration reaches the preset time threshold, where the prompt message is used to notify the preset person that there is a flow fault in the EGR of the target engine.
The apparatus provided in the embodiment of the present application may be configured to implement the technical solution of the method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again in the embodiment of the present application.
Fig. 6 is a schematic diagram of a hardware structure of an EGR flow fault determination device according to an embodiment of the present application. As shown in fig. 6, the EGR flow rate failure determination device 60 of the present embodiment includes: a processor 601 and a memory 602; wherein
A memory 602 for storing computer-executable instructions;
the processor 601 is configured to execute computer-executable instructions stored in the memory to implement the steps of the EGR flow fault determining method in the foregoing embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 602 may be separate or integrated with the processor 601.
When the memory 602 is provided independently, the EGR flow failure judgment device further includes a bus 603 for connecting the memory 602 and the processor 601. Alternatively, the bus 603 may be a CAN line.
The embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for determining the EGR flow fault is implemented as described above.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the EGR flow malfunction determination apparatus are merely illustrative, and for example, the division of the modules is merely a logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, 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 implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the EGR flow fault determination method according to various embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the EGR flow fault determining method disclosed in this application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, 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 or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or part of the steps of implementing the EGR flow fault determination method embodiments described above may be accomplished by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When the program is executed, the steps of each EGR flow fault judgment method embodiment are executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An Exhaust Gas Recirculation (EGR) flow failure determination method, comprising:
determining a correction coefficient according to a NOx emission set value and a NOx emission measured value of a target engine;
obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold;
determining a deviation of a flow parameter of the target engine according to a measured quantity of the flow parameter and a set quantity of the flow parameter, wherein the flow parameter comprises at least one of an intake air quantity and an exhaust gas quantity, the intake air quantity is an intake air quantity of fresh air other than an EGR flow, and the exhaust gas quantity is the EGR flow;
and judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
2. The method of claim 1, wherein the target deviation threshold comprises a first target deviation threshold and a second target deviation threshold;
the judging whether the EGR of the target engine has flow fault according to the deviation of the flow parameter and the target deviation threshold value comprises the following steps:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
3. The method of claim 1, wherein obtaining a target deviation threshold value according to the correction factor and a preset deviation threshold value comprises:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value.
4. The method of claim 1, further comprising:
if the EGR of the target engine has flow faults, acquiring the duration of the flow faults of the EGR of the target engine;
comparing the duration to a preset time threshold;
and if the duration reaches the preset time threshold, sending prompt information to preset personnel, wherein the prompt information is used for informing the preset personnel that the flow fault exists in the EGR of the target engine.
5. An Exhaust Gas Recirculation (EGR) flow failure determination device, comprising:
a first determination module for determining a correction factor based on a NOx emission set point and a NOx emission measurement for a target engine;
the obtaining module is used for obtaining a target deviation threshold according to the correction coefficient and a preset deviation threshold;
the second determination module is used for determining the deviation of the flow parameter according to the measured quantity of the flow parameter of the target engine and the set quantity of the flow parameter, wherein the flow parameter comprises at least one of an air intake quantity and an exhaust gas quantity, the air intake quantity is the air intake quantity of fresh air except for the EGR flow, and the exhaust gas quantity is the EGR flow;
and the judging module is used for judging whether the EGR of the target engine has flow faults or not according to the deviation of the flow parameters and the target deviation threshold value.
6. The apparatus of claim 5, wherein the target deviation threshold comprises a first target deviation threshold and a second target deviation threshold;
the determining module determines whether the EGR of the target engine has a flow fault according to the deviation of the flow parameter and the target deviation threshold, including:
if the flow parameter comprises air inflow, judging whether the deviation of the air inflow reaches the first target deviation threshold value;
if the deviation of the air inflow reaches the first target deviation threshold value, determining that the EGR of the target engine has a flow fault;
if the flow parameter comprises the exhaust gas amount, judging whether the deviation of the exhaust gas amount reaches a second target deviation threshold value;
and if the deviation of the exhaust gas quantity reaches the second target deviation threshold value, determining that the EGR of the target engine has a flow fault.
7. The apparatus of claim 5, wherein the obtaining module obtains a target deviation threshold according to the correction coefficient and a preset deviation threshold, and comprises:
and obtaining the target deviation threshold value according to the product of the correction coefficient and the preset deviation threshold value.
8. The apparatus of claim 5, further comprising:
the obtaining module is used for obtaining the duration of the EGR of the target engine with the flow fault if the EGR of the target engine has the flow fault;
the comparison module is used for comparing the duration with a preset time threshold;
and the sending module is used for sending prompt information to preset personnel if the duration reaches the preset time threshold, wherein the prompt information is used for informing the preset personnel that the flow fault exists in the EGR of the target engine.
9. An EGR flow failure judgment device characterized by comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the EGR flow fault determination method of any of claims 1-4.
10. A computer-readable storage medium having stored therein computer-executable instructions that, when executed by a processor, implement the EGR flow failure determination method according to any one of claims 1 to 4.
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| CN112177811B (en) * | 2020-09-25 | 2021-08-31 | 江铃汽车股份有限公司 | Remote online monitoring method for flow of EGR (exhaust gas Recirculation) system of electric control diesel engine |
| CN112459910B (en) * | 2020-11-10 | 2022-02-18 | 东风汽车集团有限公司 | Method and system for calculating target EGR rate |
| CN113002454B (en) * | 2021-03-15 | 2022-07-26 | 浙江吉利控股集团有限公司 | OBD fault alarm method and system for vehicle and vehicle |
| CN113217234B (en) * | 2021-04-22 | 2022-08-12 | 联合汽车电子有限公司 | Low-flow fault diagnosis method and system for EGR (exhaust gas Recirculation) system and readable storage medium |
| CN113884307A (en) * | 2021-08-19 | 2022-01-04 | 潍柴动力股份有限公司 | Method and system for detecting accuracy of air inflow sensor |
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