CN113176050A - Air leakage detection method and device for engine aftertreatment and exhaust pipeline - Google Patents
Air leakage detection method and device for engine aftertreatment and exhaust pipeline Download PDFInfo
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- CN113176050A CN113176050A CN202110514294.XA CN202110514294A CN113176050A CN 113176050 A CN113176050 A CN 113176050A CN 202110514294 A CN202110514294 A CN 202110514294A CN 113176050 A CN113176050 A CN 113176050A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The application discloses a method and a device for detecting air leakage of an engine aftertreatment and exhaust pipeline, which are used for obtaining a first corresponding relation and a second corresponding relation by pre-measurement. And under the conditions that the rotating speed of the engine is not less than a preset rotating speed lower limit threshold value, the circulating oil supply amount of the engine is not less than a preset circulating oil amount threshold value and the operating condition of the engine is stable, determining that the engine is in a state to be tested. The first exhaust pressure is determined based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow. And calculating the difference between the first exhaust pressure and the target exhaust pressure to obtain a target value. And determining that the air leakage of the engine after-treatment and the exhaust pipeline occurs under the condition that the target value is larger than a preset threshold value. Utilize this application scheme can effectively detect the gas leakage state of engine aftertreatment and exhaust pipe to, need not to carry out any transformation to engine aftertreatment and exhaust pipe, gas leakage detection is with low costs, the suitability is stronger.
Description
Technical Field
The application relates to the field of engines, in particular to a method and a device for detecting air leakage of an engine aftertreatment and exhaust pipeline.
Background
Engine exhaust line blowby, especially aftertreatment internal blowby, is often difficult to detect or observe, a difficult case of such blowby troubleshooting both in full car and bench tests.
Therefore, how to effectively detect the air leakage state of the engine after-treatment and the exhaust pipeline becomes a problem which needs to be solved in the field.
Disclosure of Invention
The application provides a method and a device for detecting air leakage of an engine aftertreatment and an exhaust pipeline, and aims to effectively detect the air leakage state of the engine aftertreatment and the exhaust pipeline.
In order to achieve the above object, the present application provides the following technical solutions:
a method of leak detection in an engine aftertreatment and exhaust circuit, comprising:
pre-measuring to obtain a first corresponding relation and a second corresponding relation; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence relationship includes a correspondence relationship between a carbon load of the engine, a differential pressure, and the exhaust flow rate;
under the conditions that the rotating speed of the engine is detected to be not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is detected to be not less than a preset circulating oil quantity threshold value, and the operating condition of the engine is stable, the engine is determined to be in a state to be detected;
identifying the carbon capacity of the engine in a state to be tested as a target carbon capacity;
identifying the exhaust flow of the engine in a state to be measured as a target exhaust flow;
identifying the exhaust pressure of the engine in a state to be detected as a target exhaust pressure;
determining a first exhaust pressure based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow;
calculating a difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value;
and determining that air leakage occurs in the engine aftertreatment and exhaust pipelines under the condition that the target value is larger than a preset threshold value.
Optionally, the obtaining the first corresponding relationship and the second corresponding relationship by the pre-measurement includes:
acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake air pressure at the air inlet;
determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply quantity recorded in advance by an on-board computer;
acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline;
taking the correspondence between the exhaust flow rate and the exhaust pressure as the first correspondence;
and measuring the pressure difference and the exhaust flow of the particle catcher under different carbon loading capacity in advance, and taking the corresponding relation among the carbon loading capacity, the pressure difference and the exhaust flow as the second corresponding relation.
Optionally, the determining the exhaust gas flow rate of the engine based on the temperature, the intake pressure, and the corresponding relationship between the intake air flow rate and the circulating oil supply rate, which is pre-recorded by an on-board computer, includes:
calculating a first intake air flow rate based on the temperature and the intake air pressure;
determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as a first circulating oil supply amount;
calculating the sum of the first intake air flow rate and the first circulating oil supply amount to obtain the exhaust gas flow rate of the engine.
Optionally, the determining a first exhaust pressure based on the first corresponding relationship, the second corresponding relationship, the target carbon loading, and the target exhaust flow rate includes:
determining a pressure difference corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence;
determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence;
and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading capacity and the target exhaust flow to obtain a first exhaust pressure.
A gas leak detection apparatus for an engine aftertreatment and exhaust circuit, comprising:
the measuring unit is used for measuring in advance to obtain a first corresponding relation and a second corresponding relation; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence relationship includes a correspondence relationship between a carbon load of the engine, a differential pressure, and the exhaust flow rate;
the first determining unit is used for determining that the engine is in a state to be tested under the conditions that the rotating speed of the engine is not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is not less than a preset circulating oil quantity threshold value and the operating condition of the engine is stable;
the identification unit is used for identifying the carbon loading capacity of the engine in a state to be detected as a target carbon loading capacity; identifying the exhaust flow of the engine in a state to be measured as a target exhaust flow; identifying the exhaust pressure of the engine in a state to be detected as a target exhaust pressure;
a second determining unit configured to determine a first exhaust pressure based on the first correspondence relationship, the second correspondence relationship, the target carbon loading, and the target exhaust flow rate;
the calculating unit is used for calculating the difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value;
and the third determination unit is used for determining that the air leakage of the engine after-treatment and the exhaust pipeline occurs under the condition that the target value is larger than a preset threshold value.
Optionally, the measurement unit is specifically configured to:
acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake air pressure at the air inlet;
determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply quantity recorded in advance by an on-board computer;
acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline;
taking the correspondence between the exhaust flow rate and the exhaust pressure as the first correspondence;
and measuring the pressure difference and the exhaust flow of the particle catcher under different carbon loading capacity in advance, and taking the corresponding relation among the carbon loading capacity, the pressure difference and the exhaust flow as the second corresponding relation.
Optionally, the measuring unit is configured to determine an exhaust flow rate of the engine based on the temperature, the intake pressure, and a corresponding relationship between an intake flow rate and a circulating oil supply amount, which are pre-recorded by an onboard computer, and includes:
the measurement unit is specifically configured to:
calculating a first intake air flow rate based on the temperature and the intake air pressure;
determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as a first circulating oil supply amount;
calculating the sum of the first intake air flow rate and the first circulating oil supply amount to obtain the exhaust gas flow rate of the engine.
Optionally, the second determining unit is specifically configured to:
determining a pressure difference corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence;
determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence;
and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading capacity and the target exhaust flow to obtain a first exhaust pressure.
A computer-readable storage medium comprising a stored program, wherein the program executes the engine aftertreatment and exhaust gas circuit leak detection method.
A gas leak detection apparatus for an engine aftertreatment and exhaust circuit, comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;
the memory is used for storing a program and the processor is used for running the program, wherein the program is run for executing the air leakage detection method of the engine after-treatment and the exhaust pipeline.
According to the technical scheme, a first corresponding relation and a second corresponding relation are obtained through pre-measurement; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence includes correspondence between carbon load, differential pressure, and exhaust flow of the engine; under the conditions that the rotating speed of the engine is detected to be not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is detected to be not less than a preset circulating oil quantity threshold value, and the operating condition of the engine is stable, the engine is determined to be in a state to be detected; identifying the carbon capacity of the engine in a state to be tested as a target carbon capacity; marking the exhaust flow of the engine in a state to be detected as a target exhaust flow; identifying the exhaust pressure of the engine in the state to be detected as a target exhaust pressure; determining a first exhaust pressure based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow; calculating a difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value; and determining that the air leakage of the engine after-treatment and the exhaust pipeline occurs under the condition that the target value is larger than a preset threshold value. Utilize this application scheme can effectively detect the gas leakage state of engine aftertreatment and exhaust pipe to, need not to carry out any transformation to engine aftertreatment and exhaust pipe, gas leakage detection is with low costs, the suitability is stronger.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1a is a schematic diagram of a method for detecting air leakage in an exhaust pipe and an engine after-treatment according to an embodiment of the present disclosure;
FIG. 1b is a schematic diagram of a sensor arrangement according to an embodiment of the present disclosure;
FIG. 1c is a schematic diagram illustrating a relationship between an exhaust flow rate and an exhaust pressure according to an embodiment of the present disclosure;
FIG. 1d is a schematic diagram illustrating a relationship among carbon loading, differential pressure, and exhaust flow according to an embodiment of the present disclosure;
FIG. 1e is a schematic diagram of an implementation logic provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of another method for detecting air leakage in an exhaust line and an engine after-treatment according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a gas leakage detection device for an engine aftertreatment and exhaust pipeline according to an embodiment of the present disclosure.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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.
As shown in fig. 1a, a schematic diagram of a method for detecting air leakage of an engine aftertreatment and exhaust pipe according to an embodiment of the present application includes the following steps:
s101: a first parameter item acquired by a sensor preset at an engine air inlet is acquired.
The sensor preset at the air inlet of the engine comprises a temperature sensor and a first pressure sensor, correspondingly, a first parameter item acquired by the temperature sensor is the temperature at the air inlet, and a first parameter item acquired by the first pressure sensor is the air inlet pressure at the air inlet.
It should be noted that, based on the temperature sensor and the first pressure sensor, the intake flow of the engine is measured in real time, so that the influence of different environmental temperature conditions on the intake flow is avoided, and the accuracy of intake flow measurement is improved.
S102: the first intake air flow rate is calculated based on the temperature at the intake port and the intake pressure at the intake port.
The specific calculation process for calculating the first intake air flow rate based on the temperature at the air inlet and the intake pressure at the air inlet is well known to those skilled in the art, and will not be described herein again.
S103: and determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as the first circulating oil supply amount.
S104: and calculating the sum of the first air inflow and the first circulating oil supply to obtain the exhaust gas flow of the engine.
S105: and acquiring a second parameter item collected by a sensor preset on an exhaust port of the engine.
The sensor preset on the exhaust port of the engine comprises a second pressure sensor, and a second parameter item acquired by the second pressure sensor is the exhaust pressure of the exhaust pipeline and the aftertreatment of the engine. In the embodiment of the present application, the first pressure sensor and the second pressure sensor are both pressure sensors known in the art, and are different only in their respective mounting positions.
Specifically, the second pressure sensor, which is preset at the exhaust port of the engine, is arranged in a specific manner as shown in fig. 1 b. In fig. 1b, 1 denotes an engine, 2 a second pressure sensor, 3 an engine aftertreatment, and 4 an exhaust line. It should be noted that the content shown in fig. 1b is only for illustration.
S106: the correspondence between the exhaust flow rate and the exhaust pressure is taken as a first correspondence.
Among these, based on a large amount of experimental data, the applicant found: the exhaust flow rate is linearly related to the exhaust pressure. Under the condition that the exhaust flow value is low and the exhaust pressure value is small, the deviation proportion between the exhaust flow and the exhaust pressure is relatively small, so that the working condition that the engine has high exhaust flow is selected as the reference basis for air leakage diagnosis.
Specifically, the corresponding relationship between the exhaust flow rate and the exhaust pressure can be seen in fig. 1 c. It should be noted that the content shown in fig. 1c is only for illustration.
In the embodiment of the present application, S106 performs reference calibration for linearization of the exhaust flow and the exhaust pressure, so that the subsequent steps can conveniently and effectively determine the gas leakage state of the exhaust pipe and the aftertreatment of the engine by using the corresponding relationship between the exhaust flow and the exhaust pressure.
S107: pressure differences of a Particulate trap (DPF) at different carbon loadings are measured in advance, and the correspondence among the carbon loadings, the pressure differences, and the exhaust gas flow rates is taken as a second correspondence.
In practical applications, the DPF exhausts at different carbon loadings, and different pressure differences are generated, and accordingly, the pressure differences are used for representing the difference between the pressure before exhaust and the pressure after exhaust. So-called aftertreatment, i.e. a device for eliminating engine gases and emission products such as particulate matter. The so-called carbon loading is the weight of particulate matter accumulated by the DPF when replenishing the particulate matter in the exhaust.
In particular, the correspondence between carbon loading, differential pressure, and exhaust flow may be seen in fig. 1d (the amount of exhaust gas shown in fig. 1d, an alternative expression for exhaust flow). It should be noted that the content shown in fig. 1d is only for illustration.
S108: and under the conditions that the rotating speed of the engine is not less than a preset rotating speed lower limit threshold value, the circulating oil supply amount of the engine is not less than a preset circulating oil amount threshold value and the operating condition of the engine is stable, determining that the engine is in a state to be tested.
The engine is in a state to be tested, which indicates that air leakage may occur in the engine aftertreatment and exhaust pipelines.
It should be noted that, in order to ensure the accuracy of air leakage detection, air leakage detection is performed under the conditions that the exhaust flow of the engine is relatively high and the operation condition is stable, so as to avoid the occurrence of misjudgment, thereby improving the reliability of air leakage detection.
S109: and identifying the carbon capacity of the engine in the state to be detected as the target carbon capacity.
S110: and marking the exhaust flow of the engine in the state to be measured as a target exhaust flow.
S111: and marking the exhaust pressure of the engine in the state to be detected as the target exhaust pressure.
The exhaust pressure of the engine in the state to be detected is acquired based on a sensor preset at an exhaust port of the engine.
S112: and determining a differential pressure corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence relationship.
S113: based on the first correspondence relationship, an exhaust pressure corresponding to the target exhaust flow rate is determined.
S114: and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading and the target exhaust flow to obtain the first exhaust pressure.
In practical application, the carbon loading amount has a great influence on the exhaust pressure, so that the carbon loading amount is taken into the judgment basis of gas leakage detection, the linearization correction of the exhaust flow and the exhaust pressure under different carbon loading amounts is realized, the linearization of the exhaust flow and the exhaust pressure is ensured to be converted from one dimension to two dimensions, the detection result of the gas leakage detection is more accurate, and the pressure difference misjudgment caused by the carbon loading amount can be effectively avoided.
S115: and calculating the difference between the first exhaust pressure and the target exhaust pressure to obtain a target value.
S116: and judging whether the target value is larger than a preset threshold value or not.
If the target value is greater than the preset threshold, S117 is performed, otherwise S118 is performed.
S117: and determining that the engine aftertreatment and the exhaust pipeline are leaked, and sending a leakage prompt to a user.
S118: it was determined that no air leakage occurred in the engine aftertreatment and exhaust lines.
For the flow shown in S108 to S118, the specific implementation logic thereof can be seen in fig. 1 e. In fig. 1e, the actual turbine rear pressure is an expression of the target exhaust pressure, and the turbine rear pressure is an expression of the first exhaust pressure. It should be noted that the content shown in fig. 1e is only for illustration.
In conclusion, by the scheme of the embodiment, the air leakage state of the engine aftertreatment and the exhaust pipeline can be effectively detected, the engine aftertreatment and the exhaust pipeline do not need to be modified, the air leakage detection cost is low, and the applicability is high.
It should be noted that, in the above embodiments, reference is made to S101, which is an alternative implementation of the air leakage detection method for the engine after-treatment and exhaust pipeline described in the present application. In addition, S102 mentioned in the above embodiments is also an optional implementation of the air leakage detection method for the engine aftertreatment and the exhaust pipe described in the present application. For this reason, the flow mentioned in the above embodiment can be summarized as the method shown in fig. 2.
Referring to fig. 2, a schematic diagram of another method for detecting air leakage of an exhaust pipe and an engine after-treatment according to an embodiment of the present application is provided, which includes the following steps:
s201: and measuring in advance to obtain the first corresponding relation and the second corresponding relation.
Wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence includes a correspondence between a carbon load of the engine, a pressure difference, and an exhaust flow rate.
S202: and under the conditions that the rotating speed of the engine is not less than a preset rotating speed lower limit threshold value, the circulating oil supply amount of the engine is not less than a preset circulating oil amount threshold value and the operating condition of the engine is stable, determining that the engine is in a state to be tested.
S203: and identifying the carbon capacity of the engine in the state to be detected as the target carbon capacity.
S204: and marking the exhaust flow of the engine in the state to be measured as a target exhaust flow.
S205: and marking the exhaust pressure of the engine in the state to be detected as the target exhaust pressure.
S206: the first exhaust pressure is determined based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow.
S207: and calculating the difference between the first exhaust pressure and the target exhaust pressure to obtain a target value.
S208: and determining that the air leakage of the engine after-treatment and the exhaust pipeline occurs under the condition that the target value is larger than a preset threshold value.
In conclusion, by the scheme of the embodiment, the air leakage state of the engine aftertreatment and the exhaust pipeline can be effectively detected, the engine aftertreatment and the exhaust pipeline do not need to be modified, the air leakage detection cost is low, and the applicability is high.
Corresponding to the air leakage detection method for the engine aftertreatment and the exhaust pipeline provided by the embodiment of the application, the embodiment of the application also provides an air leakage detection device for the engine aftertreatment and the exhaust pipeline.
As shown in fig. 3, a schematic architecture diagram of a gas leakage detecting apparatus for an engine aftertreatment and exhaust pipe according to an embodiment of the present application includes:
a measuring unit 100, configured to measure in advance to obtain a first corresponding relationship and a second corresponding relationship; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence includes a correspondence between a carbon load of the engine, a pressure difference, and an exhaust flow rate.
Wherein, the measurement unit 100 is specifically configured to: acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake pressure at the air inlet; determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer; acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline; taking the corresponding relation between the exhaust flow and the exhaust pressure as a first corresponding relation; the pressure difference of the particle trap under different carbon loading amounts and the exhaust flow rate are measured in advance, and the corresponding relation among the carbon loading amount, the pressure difference and the exhaust flow rate is used as a second corresponding relation.
The measurement unit 100 is used for determining a specific process of the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relationship between the intake flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and comprises the following steps: calculating a first intake air flow rate based on the temperature and the intake air pressure; determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as the first circulating oil supply amount; and calculating the sum of the first air inflow and the first circulating oil supply to obtain the exhaust gas flow of the engine.
The first determining unit 200 is configured to determine that the engine is in a state to be tested when it is detected that the rotation speed of the engine is not less than a preset rotation speed lower limit threshold, the circulating oil supply amount of the engine is not less than a preset circulating oil amount threshold, and the operating condition of the engine is stable.
An identification unit 300, configured to identify a carbon loading of the engine in a state to be tested as a target carbon loading; marking the exhaust flow of the engine in a state to be detected as a target exhaust flow; and marking the exhaust pressure of the engine in the state to be detected as the target exhaust pressure.
A second determining unit 400 for determining the first exhaust pressure based on the first correspondence relationship, the second correspondence relationship, the target carbon loading, and the target exhaust flow rate.
The second determining unit 400 is specifically configured to: determining a pressure difference corresponding to the target carbon loading and the target exhaust flow based on the second corresponding relationship; determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence; and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading and the target exhaust flow to obtain the first exhaust pressure.
And a calculating unit 500 for calculating a difference between the first exhaust pressure and the target exhaust pressure to obtain a target value.
A third determination unit 600 for determining that air leakage occurs in the engine after-treatment and exhaust line if the target value is greater than a preset threshold.
In conclusion, by the scheme of the embodiment, the air leakage state of the engine aftertreatment and the exhaust pipeline can be effectively detected, the engine aftertreatment and the exhaust pipeline do not need to be modified, the air leakage detection cost is low, and the applicability is high.
The present application further provides a computer readable storage medium comprising a stored program, wherein the program performs the engine aftertreatment and exhaust gas circuit leak detection method provided herein above.
The application also provides an engine aftertreatment and exhaust pipe's gas leakage detection equipment, includes: a processor, a memory, and a bus. The processor is connected with the memory through a bus, the memory is used for storing programs, the processor is used for running the programs, and when the programs are run, the method for detecting the gas leakage of the engine after-treatment and the exhaust pipeline, provided by the application, is executed, and comprises the following steps:
pre-measuring to obtain a first corresponding relation and a second corresponding relation; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence relationship includes a correspondence relationship between a carbon load of the engine, a differential pressure, and the exhaust flow rate;
under the conditions that the rotating speed of the engine is detected to be not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is detected to be not less than a preset circulating oil quantity threshold value, and the operating condition of the engine is stable, the engine is determined to be in a state to be detected;
identifying the carbon capacity of the engine in a state to be tested as a target carbon capacity;
identifying the exhaust flow of the engine in a state to be measured as a target exhaust flow;
identifying the exhaust pressure of the engine in a state to be detected as a target exhaust pressure;
determining a first exhaust pressure based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow;
calculating a difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value;
and determining that air leakage occurs in the engine aftertreatment and exhaust pipelines under the condition that the target value is larger than a preset threshold value.
Optionally, the obtaining the first corresponding relationship and the second corresponding relationship by the pre-measurement includes:
acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake air pressure at the air inlet;
determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply quantity recorded in advance by an on-board computer;
acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline;
taking the correspondence between the exhaust flow rate and the exhaust pressure as the first correspondence;
and measuring the pressure difference and the exhaust flow of the particle catcher under different carbon loading capacity in advance, and taking the corresponding relation among the carbon loading capacity, the pressure difference and the exhaust flow as the second corresponding relation.
Optionally, the determining the exhaust gas flow rate of the engine based on the temperature, the intake pressure, and the corresponding relationship between the intake air flow rate and the circulating oil supply rate, which is pre-recorded by an on-board computer, includes:
calculating a first intake air flow rate based on the temperature and the intake air pressure;
determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as a first circulating oil supply amount;
calculating the sum of the first intake air flow rate and the first circulating oil supply amount to obtain the exhaust gas flow rate of the engine.
Optionally, the determining a first exhaust pressure based on the first corresponding relationship, the second corresponding relationship, the target carbon loading, and the target exhaust flow rate includes:
determining a pressure difference corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence;
determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence;
and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading capacity and the target exhaust flow to obtain a first exhaust pressure.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of detecting engine aftertreatment and exhaust line leakage, comprising:
pre-measuring to obtain a first corresponding relation and a second corresponding relation; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence relationship includes a correspondence relationship between a carbon load of the engine, a differential pressure, and the exhaust flow rate;
under the conditions that the rotating speed of the engine is detected to be not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is detected to be not less than a preset circulating oil quantity threshold value, and the operating condition of the engine is stable, the engine is determined to be in a state to be detected;
identifying the carbon capacity of the engine in a state to be tested as a target carbon capacity;
identifying the exhaust flow of the engine in a state to be measured as a target exhaust flow;
identifying the exhaust pressure of the engine in a state to be detected as a target exhaust pressure;
determining a first exhaust pressure based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow;
calculating a difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value;
and determining that air leakage occurs in the engine aftertreatment and exhaust pipelines under the condition that the target value is larger than a preset threshold value.
2. The method of claim 1, wherein the pre-measuring a first correspondence and a second correspondence comprises:
acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake air pressure at the air inlet;
determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply quantity recorded in advance by an on-board computer;
acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline;
taking the correspondence between the exhaust flow rate and the exhaust pressure as the first correspondence;
and measuring the pressure difference and the exhaust flow of the particle catcher under different carbon loading capacity in advance, and taking the corresponding relation among the carbon loading capacity, the pressure difference and the exhaust flow as the second corresponding relation.
3. The method of claim 2, wherein determining an exhaust flow rate of an engine based on the temperature, the intake pressure, and a correspondence between intake air flow rates and circulating oil supply rates pre-recorded by an on-board computer comprises:
calculating a first intake air flow rate based on the temperature and the intake air pressure;
determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as a first circulating oil supply amount;
calculating the sum of the first intake air flow rate and the first circulating oil supply amount to obtain the exhaust gas flow rate of the engine.
4. The method of claim 1, wherein the determining a first exhaust pressure based on the first correspondence, the second correspondence, the target carbon loading, and the target exhaust flow comprises:
determining a pressure difference corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence;
determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence;
and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading capacity and the target exhaust flow to obtain a first exhaust pressure.
5. An engine aftertreatment and exhaust circuit leak detection device, comprising:
the measuring unit is used for measuring in advance to obtain a first corresponding relation and a second corresponding relation; wherein the first correspondence includes a correspondence between an exhaust flow rate and an exhaust pressure of the engine; the second correspondence relationship includes a correspondence relationship between a carbon load of the engine, a differential pressure, and the exhaust flow rate;
the first determining unit is used for determining that the engine is in a state to be tested under the conditions that the rotating speed of the engine is not less than a preset rotating speed lower limit threshold value, the circulating oil supply quantity of the engine is not less than a preset circulating oil quantity threshold value and the operating condition of the engine is stable;
the identification unit is used for identifying the carbon loading capacity of the engine in a state to be detected as a target carbon loading capacity; identifying the exhaust flow of the engine in a state to be measured as a target exhaust flow; identifying the exhaust pressure of the engine in a state to be detected as a target exhaust pressure;
a second determining unit configured to determine a first exhaust pressure based on the first correspondence relationship, the second correspondence relationship, the target carbon loading, and the target exhaust flow rate;
the calculating unit is used for calculating the difference value between the first exhaust pressure and the target exhaust pressure to obtain a target value;
and the third determination unit is used for determining that the air leakage of the engine after-treatment and the exhaust pipeline occurs under the condition that the target value is larger than a preset threshold value.
6. The apparatus according to claim 5, wherein the measurement unit is specifically configured to:
acquiring a first parameter item acquired by a sensor preset at an air inlet of an engine; the first parameter item includes a temperature at the air inlet and an intake air pressure at the air inlet;
determining the exhaust flow of the engine based on the temperature, the intake pressure and the corresponding relation between the intake flow and the circulating oil supply quantity recorded in advance by an on-board computer;
acquiring a second parameter item acquired by a sensor preset at an exhaust port of the engine; the second parameter item comprises exhaust pressure of an engine after-treatment and an exhaust pipeline;
taking the correspondence between the exhaust flow rate and the exhaust pressure as the first correspondence;
and measuring the pressure difference and the exhaust flow of the particle catcher under different carbon loading capacity in advance, and taking the corresponding relation among the carbon loading capacity, the pressure difference and the exhaust flow as the second corresponding relation.
7. The apparatus of claim 6, wherein the measurement unit is configured to determine an exhaust flow rate of the engine based on the temperature, the intake pressure, and a correspondence between an intake air flow rate and a circulating oil supply amount, which are pre-recorded by an on-board computer, and comprises:
the measurement unit is specifically configured to:
calculating a first intake air flow rate based on the temperature and the intake air pressure;
determining the circulating oil supply amount corresponding to the first air inlet flow based on the corresponding relation between the air inlet flow and the circulating oil supply amount recorded in advance by the vehicle-mounted computer, and marking the circulating oil supply amount corresponding to the first air inlet flow as a first circulating oil supply amount;
calculating the sum of the first intake air flow rate and the first circulating oil supply amount to obtain the exhaust gas flow rate of the engine.
8. The apparatus according to claim 5, wherein the second determining unit is specifically configured to:
determining a pressure difference corresponding to the target carbon loading and corresponding to the target exhaust gas flow rate based on the second correspondence;
determining an exhaust pressure corresponding to the target exhaust flow rate based on the first correspondence;
and calculating the sum of the exhaust pressure corresponding to the target exhaust flow and the differential pressure corresponding to the target carbon loading capacity and the target exhaust flow to obtain a first exhaust pressure.
9. A computer-readable storage medium, comprising a stored program, wherein the program performs the engine after-treatment and exhaust line leak detection method of any of claims 1-4.
10. An engine aftertreatment and exhaust circuit leak detection apparatus, comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;
the memory is adapted to store a program and the processor is adapted to run the program, wherein the program is adapted to perform the method of leak detection of an exhaust line and an engine after-treatment according to any of claims 1-4 when executed.
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