Method and device for detecting carbon deposition amount of air inlet channel of EGR (Exhaust Gas Recirculation) engine

Abstract

The invention relates to a method and device for detecting the carbon deposition amount of an EGR engine air inlet channel, and the method comprises the steps: carrying out the calibration of the particle emission in the rear exhaust of a turbine of a target engine under different working conditions, and forming an exhaust particle emission chart; according to the exhaust particulate matter emission chart, the accumulated emission amount of exhaust particulate matter behind an engine turbine is calculated; calibrating the exhaust gas recirculation rates of the target engine under different working conditions to form an exhaust gas recirculation rate chart; according to the exhaust gas recirculation rate chart, the total mass of particulate matter contained in exhaust gas reaching the gas inlet side in the exhaust gas recirculation system is calculated; and calculating the particulate matter adsorption coefficient and the particulate matter adsorption mass of the air inlet channel according to the total mass of the particulate matters contained in the waste gas on the air inlet side. The exhaust particulate matter emission data of the engine under different working conditions are actually collected through various sensors, the accumulation amount of particulate matters in exhaust can be accurately calculated, and the accuracy of a detection result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a method and device for detecting the amount of carbon deposition in the intake passage of an EGR engine. BACKGROUND

[0002] During operation, engines inevitably produce a certain amount of particulate matter, which mainly comes from incomplete combustion of fuel, evaporation of engine oil, and pollution from the external environment. As the vehicle mileage accumulates, these particulate matters gradually deposit on the inner wall of the intake passage, causing the flow capacity of the intake passage to gradually decrease. This phenomenon not only affects the intake flow of the engine, but also increases the resistance of the air passage, thereby directly affecting the overall performance of the engine.

[0003] Currently, there are relatively few methods for detecting and evaluating the amount of carbon deposition in the intake passage of an engine, which often relies on experience or simple visual inspection. This method lacks accuracy and reliability, making it difficult to provide scientific basis for engine maintenance and performance correction. SUMMARY

[0004] To solve the above problems, the purpose of the embodiments of the present application is to provide a method and device for detecting the amount of carbon deposition in the intake passage of an EGR engine.

[0005] A method for detecting the amount of carbon deposition in the intake passage of an EGR engine, comprising:

[0006] Step 1: Calibrate the particulate matter emissions in the exhaust gas after the turbine of the target engine under different speeds and fuel injection amounts to form an exhaust particulate matter emission chart;

[0007] Step 2: Calibrate the output power of the engine under different speeds and fuel injection amounts to form an engine output power chart;

[0008] Step 3: Calculate the cumulative emissions of particulate matter in the exhaust gas after the turbine of the engine according to the exhaust particulate matter emission chart and the engine output power chart;

[0009] Step 4: Calibrate the exhaust gas recirculation rate of the target engine under different speeds and fuel injection amounts to form an exhaust gas recirculation rate chart;

[0010] Step 5: Calculate the total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system according to the exhaust gas recirculation rate chart;

[0011] Step 6: Calculate the particulate matter adsorption coefficient of the intake passage according to the total mass of particulate matter contained in the exhaust gas on the intake side;

[0012] Step 7: Calculate the particulate matter adsorption mass of the intake passage using the particulate matter adsorption coefficient of the intake passage.

[0013] Preferably, in step 1, the exhaust particulate emission chart is constructed with the engine speed as the x-axis, the fuel injection amount as the y-axis, and the particulate emission in the exhaust after the turbine as the z-axis.

[0014] Preferably, in step 2, the engine output power chart is constructed with the engine speed as the x-axis, the fuel injection amount as the y-axis, and the output power of the engine as the z-axis.

[0015] Preferably, in step 3, the cumulative emission amount of the exhaust particulate after the turbine of the engine is calculated according to the following formula:

[0016] Cumulative emission amount of the exhaust particulate after the turbine of the engine = Output power of the engine * Particulate emission in the exhaust after the turbine * Working time of the engine.

[0017] Preferably, in step 5, the total mass of the particulate contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system is calculated according to the following formula:

[0018] Exhaust gas recirculation rate of the engine = Exhaust gas recirculation flow rate / (Exhaust gas recirculation flow rate + Intake flow rate);

[0019] Total mass of the particulate contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system = Exhaust gas recirculation flow rate / Exhaust flow rate * Cumulative emission amount of the exhaust particulate after the turbine of the engine.

[0020] Preferably, in step 6, the particulate adsorption coefficient of the intake port is calculated according to the following formula:

[0021] Particulate adsorption coefficient of the intake port = Mass of the particulate in the intake port / Total mass of the particulate contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system.

[0022] The present application also provides a device for detecting the amount of carbon deposition in the intake port of an EGR engine, comprising:

[0023] An exhaust particulate collection module for collecting the particulate emission in the exhaust after the turbine of a target engine under different engine speeds and fuel injection amounts to form an exhaust particulate emission chart;

[0024] An engine output power calibration module for calibrating the output power of the target engine under different engine speeds and fuel injection amounts to form an engine output power chart;

[0025] An exhaust particulate cumulative emission amount calculation module for calculating the cumulative emission amount of the exhaust particulate after the turbine of the engine according to the exhaust particulate emission chart and the engine output power chart;

[0026] The exhaust gas recirculation rate calibration module is used for calibrating the exhaust gas recirculation rate of the target engine under different rotating speeds and fuel injection amounts to form an exhaust gas recirculation rate table;

[0027] The total particulate mass calculation module is used for calculating the total particulate mass contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system according to the exhaust gas recirculation rate table;

[0028] The intake passage particulate adsorption coefficient calculation module is used for calculating the particulate adsorption coefficient of the intake passage according to the total particulate mass contained in the exhaust gas on the intake side;

[0029] The intake passage particulate adsorption mass calculation module is used for calculating the particulate adsorption mass of the intake passage by using the particulate adsorption coefficient of the intake passage.

[0030] The application further provides an electronic device, including a bus, a transceiver, a memory, a processor and a computer program stored in the memory and executable on the processor, the transceiver, the memory and the processor are connected through the bus, characterized in that the computer program is executed by the processor to realize the steps in the method for detecting the intake passage carbon deposition amount of the EGR engine.

[0031] The application further provides a computer readable storage medium, which stores a computer program, characterized in that the computer program is executed by the processor to realize the steps in the method for detecting the intake passage carbon deposition amount of the EGR engine.

[0032] According to the specific embodiments of the application, the following technical effects are achieved:

[0033] The application relates to a method for detecting the intake passage carbon deposition amount of an EGR engine, compared with the prior art, the method can accurately calculate the cumulative amount of particulate matters in exhaust gas by collecting the exhaust particulate emission data of the engine under different working conditions by using various sensors, and the accuracy of the detection result is ensured.

[0034] In order to make the above objectives, characteristics and advantages of the present application more apparent, the following preferred embodiments are described in detail below, and the accompanying drawings are referred to, and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 A flow chart of a method for detecting the amount of carbon deposition in the intake passage of an EGR engine is provided. DETAILED DESCRIPTION

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Please refer to Figure 1 A method for detecting the amount of carbon deposition in the intake passage of an EGR engine, comprising:

[0041] Step 1: Calibrate the particulate matter emission in the exhaust gas after the turbine of the target engine under different speeds and fuel injection amounts, and form an exhaust particulate matter emission chart;

[0042] In practical application, different engines will output different combinations of exhaust temperature, exhaust flow, intake temperature, intake flow, EGR rate and the like under different working conditions (different speeds, power, torque, fuel injection amount). By detecting these parameters with sensors, the working condition parameters of the corresponding engine of the target engine under different speeds and fuel injection amounts can be obtained.

[0043] The present application needs to install high-precision filter paper in the exhaust pipe behind the engine turbine when collecting the particulate matter emission in the exhaust gas, so that the particulate matter in the exhaust gas can be continuously collected, the particulate matter accumulated in the filter paper is weighed in the high-precision particulate matter weighing device in the laboratory after each test is completed, the mass M_soot_exh (grams) of the particulate matter discharged from the exhaust pipe can be obtained, and the exhaust passage or the intake passage of the engine is disassembled, the attached particulate matter in the passage is collected and then weighed with high precision to obtain the mass M_soot_exh_port of the particulate matter attached in the exhaust passage, and the sum of the two can obtain the particulate matter emission in the exhaust gas = M_soot_exh + M_soot_exh_port.

[0044] The present application collects the above-mentioned experimental parameters, takes the engine speed as the x-axis, takes the fuel injection amount as the y-axis, and takes the particulate matter emission in the exhaust gas behind the turbine as the z-axis to construct the exhaust particulate matter emission chart, as shown in Table 1.

[0045] Table 1 Exhaust particulate matter emission chart

[0046]

[0047] Step 2: Calibrate the engine output power of the target engine under different engine speeds and fuel injection amounts to form an engine output power chart.

[0048] In step 2, the present application takes the engine speed as the x-axis, takes the fuel injection amount as the y-axis, and takes the engine output power as the z-axis to construct the engine output power chart.

[0049] Table 2 Engine output power chart

[0050]

[0051] Step 3: Calculate the cumulative emission amount of the exhaust particulate matter behind the engine turbine according to the exhaust particulate matter emission chart and the engine output power chart.

[0052] Based on the above chart, the calculation formula of the cumulative emission amount of the exhaust particulate matter behind the engine turbine is obtained: cumulative emission amount of the exhaust particulate matter behind the engine turbine = engine output power * particulate matter emission in the exhaust gas behind the turbine * engine working time.

[0053] Step 4: Calibrate the exhaust gas recirculation rate of the target engine under different engine speeds and fuel injection amounts to form an exhaust gas recirculation rate chart.

[0054] In step 4, the present application takes the engine speed as the x-axis, takes the fuel injection amount as the y-axis, and takes the exhaust gas recirculation rate (EGR rate) as the z-axis to construct the exhaust gas recirculation rate chart.

[0055] Table 3 Exhaust gas recirculation rate chart

[0056]

[0057] Step 5: Calculate the total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system according to the exhaust gas recirculation rate chart;

[0058] In step 5, the formula for calculating the total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system in the present application is:

[0059] Exhaust gas recirculation rate of the engine = exhaust gas recirculation flow rate / (exhaust gas recirculation flow rate + intake flow rate);

[0060] Total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system = exhaust gas recirculation flow rate / exhaust flow rate * cumulative exhaust particulate matter emission after the engine turbine.

[0061] Step 6: Calculate the particulate matter adsorption coefficient of the intake port according to the total mass of particulate matter contained in the exhaust gas on the intake side;

[0062] The present application can construct a particulate matter adsorption coefficient chart of the intake port by taking the intake amount as the horizontal coordinate X, the intake pipe temperature as the Y axis, and the particulate matter adsorption coefficient of the intake port as the Z axis. This coefficient represents the ratio of the attached mass of particulate matter in the intake port to the total mass of particulate matter entering the intake port, and the specific calculation method is: particulate matter adsorption coefficient of the intake port = particulate matter mass in the intake port / total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system.

[0063] Table 4 Particulate matter adsorption coefficient chart of the intake port

[0064]

[0065] Step 7: Calculate the particulate matter adsorption mass of the intake port using the particulate matter adsorption coefficient of the intake port.

[0066] In the present application, the particulate matter adsorption mass of the intake port can be estimated by the particulate matter adsorption coefficient of the intake port * engine operating time * (total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system per unit time), so that it is not necessary to disassemble the intake port every time to measure the particulate matter adsorption mass of the intake port; when the particulate matter adsorption mass of the intake port exceeds a preset value, an alarm is issued to remind the staff to clean the intake port, thereby improving the working efficiency of the engine.

[0067] The present application also provides a device for detecting the amount of carbon deposition in the intake port of an EGR engine, comprising:

[0068] An exhaust particulate matter collecting module is configured to collect particulate matter in exhaust gas after a turbine of a target engine under different rotating speeds and fuel injection amounts, and form an exhaust particulate matter emission chart;

[0069] An engine output power calibration module is configured to calibrate output power of the target engine under different rotating speeds and fuel injection amounts, and form an engine output power chart;

[0070] An exhaust particulate matter cumulative emission amount calculating module is configured to calculate cumulative emission amount of exhaust particulate matter after a turbine of the target engine according to the exhaust particulate matter emission chart and the engine output power chart;

[0071] An exhaust gas recirculation rate calibration module is configured to calibrate exhaust gas recirculation rate of the target engine under different rotating speeds and fuel injection amounts, and form an exhaust gas recirculation rate chart;

[0072] A particulate matter total mass calculating module is configured to calculate total mass of particulate matter contained in exhaust gas reaching an intake side in an exhaust gas recirculation system according to the exhaust gas recirculation rate chart;

[0073] An intake passage particulate matter adsorption coefficient calculating module is configured to calculate a particulate matter adsorption coefficient of the intake passage according to the total mass of particulate matter contained in the exhaust gas reaching the intake side;

[0074] An intake passage particulate matter adsorption mass calculating module is configured to calculate particulate matter adsorption mass of the intake passage by using the particulate matter adsorption coefficient of the intake passage.

[0075] Compared with the prior art, the device for detecting the intake passage carbon deposit amount of the EGR engine has the same beneficial effects as the method for detecting the exhaust passage carbon deposit amount, and thus repeated description is omitted.

[0076] The application further provides an electronic device, which comprises a bus, a transceiver, a memory, a processor and a computer program stored in the memory and executable on the processor, and the transceiver, the memory and the processor are connected through the bus, characterized in that the computer program is executed by the processor to realize the steps in the method for detecting the intake passage carbon deposit amount of the EGR engine, and the electronic device has the same beneficial effects as the method for detecting the exhaust passage carbon deposit amount, and thus repeated description is omitted.

[0077] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the method for detecting the intake passage carbon deposition amount of an EGR engine.

[0078] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of changes or alternative technical solutions within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A method for detecting carbon deposits in an EGR engine intake duct, characterized in that: include: Step 1: Calibrate the particulate matter emissions in the exhaust after the turbine of the target engine at different speeds and fuel injection amounts to form an exhaust particulate matter emission chart; Step 2: Calibrate the output power of the target engine at different speeds and fuel injection amounts to form an engine output power chart; Step 3: Calculate the cumulative exhaust particulate matter emissions after the engine turbine based on the exhaust particulate matter emission chart and the engine output power chart; Step 4: Calibrate the exhaust gas recirculation rate of the target engine at different speeds and fuel injection amounts to form an exhaust gas recirculation rate chart; Step 5: Calculate the total mass of particulate matter contained in the exhaust gas reaching the intake side of the exhaust gas recirculation system based on the exhaust gas recirculation rate chart; Step 6: Calculate the particle adsorption coefficient of the intake duct based on the total mass of the particles contained in the exhaust gas on the intake side; Step 7: Calculate the particle adsorption mass in the intake duct using the particle adsorption coefficient in the intake duct.

2. The method for detecting carbon deposits in the intake duct of an EGR engine according to claim 1, characterized in that: In step 1, the exhaust particulate matter emission chart is constructed with the engine speed as the x-axis, the fuel injection amount as the y-axis, and the particulate matter emission in the exhaust after the turbine as the z-axis.

3. The method for detecting carbon deposits in the intake duct of an EGR engine according to claim 2, characterized in that: In step 2, an engine output power graph is constructed with the engine speed as the x-axis, the fuel injection amount as the y-axis, and the engine output power as the z-axis.

4. The method for detecting carbon deposits in the intake duct of an EGR engine according to claim 3, characterized in that: In step 3, the cumulative emission of exhaust particulate matter after the engine turbine is calculated as follows: The cumulative emission of particulate matter in the exhaust after the engine turbine = engine output power * particulate matter emissions in the exhaust after the turbine * engine operating time.

5. The method for detecting carbon deposits in the intake duct of an EGR engine according to claim 1, characterized in that: In step 5, the total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system is calculated as follows: Engine exhaust gas recirculation rate = exhaust gas recirculation flow / (exhaust gas recirculation flow + intake air flow); The total mass of particulate matter contained in the exhaust gas reaching the intake side of the exhaust gas recirculation system = exhaust gas recirculation flow rate / exhaust flow rate * cumulative exhaust particulate matter emissions after the engine turbine.

6. The method for detecting carbon deposits in the intake duct of an EGR engine according to claim 5, characterized in that: In step 6, the calculation formula for the particle adsorption coefficient of the intake duct is: The particle adsorption coefficient of the intake duct = the mass of the particles in the intake duct / the total mass of the particles contained in the exhaust gas reaching the intake side of the exhaust gas recirculation system.

7. A device for detecting carbon deposits in the intake duct of an EGR engine, characterized in that: include: The exhaust particulate matter collection module is used to collect particulate matter emissions from the exhaust after the turbine of the target engine at different speeds and fuel injection amounts, and form an exhaust particulate matter emission chart; The engine output power calibration module is used to calibrate the output power of the target engine at different speeds and fuel injection amounts to form an engine output power chart; an exhaust particulate matter cumulative emission calculation module, used to calculate the cumulative emission of exhaust particulate matter after the engine turbine based on the exhaust particulate matter emission chart and the engine output power chart; An exhaust gas recirculation rate calibration module is used to calibrate the exhaust gas recirculation rate of the target engine under different speeds and fuel injection amounts to form an exhaust gas recirculation rate chart; a particulate matter total mass calculation module, for calculating the total mass of particulate matter contained in the exhaust gas reaching the intake side in the exhaust gas recirculation system based on an exhaust gas recirculation rate chart; An intake duct particulate matter adsorption coefficient calculation module is used to calculate the intake duct particulate matter adsorption coefficient based on the total mass of particulate matter contained in the exhaust gas on the intake side; The intake duct particulate matter adsorption mass calculation module is used to calculate the intake duct particulate matter adsorption mass using the intake duct particulate matter adsorption coefficient.

8. An electronic device comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, wherein: When the computer program is executed by the processor, the steps of the method for detecting the amount of carbon deposits in the intake passage of an EGR engine according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for detecting the amount of carbon deposits in the intake passage of an EGR engine according to any one of claims 1 to 6 are implemented.

Images