Method and device for correcting throttle opening degree based on exhaust passage carbon deposit amount

Abstract

The present application relates to a kind of methods and devices based on exhaust passage carbon deposit amount correction throttle opening degree, comprising: collecting the particulate matter emission in exhaust of target engine under different speed and injection amount, form exhaust particulate emission chart;Based on exhaust particulate emission chart and the working time of engine, the cumulative emission of exhaust particulate matter is calculated;According to the particulate matter emission in exhaust, exhaust passage particulate matter attachment amount coefficient is calculated;According to the particulate matter attachment mass in exhaust passage, the particulate matter attachment mass in exhaust passage is calculated;According to the particulate matter attachment mass in exhaust passage, the correction value of exhaust passage flow coefficient is calculated;The throttle opening degree of engine is corrected using the correction value of exhaust passage flow coefficient to optimize the performance of engine.The present application can dynamically adjust throttle opening degree according to the exhaust particulate emission under different speed and injection amount, to adapt to different working conditions, ensure that engine works efficiently under various operating conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a method and device for correcting throttle valve opening degree based on exhaust passage carbon deposition amount. BACKGROUND

[0002] As the core power device of modern transportation vehicles, the performance of internal combustion engines directly affects the fuel efficiency, power output, and emission levels of the entire vehicle. During the long-term operation of internal combustion engines, the phenomenon of carbon deposition in the intake and exhaust passages gradually emerges, becoming one of the main problems affecting engine performance. The formation of carbon deposition is usually closely related to multiple factors, including incomplete combustion, design flaws in the intake and exhaust systems, fuel quality, and external working environment.

[0003] The accumulation of carbon deposition leads to an increase in flow resistance in the intake passage, thereby affecting the intake amount of fresh air. This increase in flow resistance has a significant negative impact on the air-fuel mixing ratio, further leading to a decrease in engine operating efficiency, manifested as insufficient power, slow acceleration, and increased emissions. In addition, the presence of carbon deposition also affects the precise adjustment of throttle valve opening, impacting the response performance of the engine under different operating conditions and reducing its overall operating stability and reliability. Long-term carbon deposition accumulation not only affects the normal use of vehicles, but also can lead to premature wear and frequent failures of the engine, thereby increasing maintenance costs.

[0004] Currently, existing technical solutions mainly focus on improving the combustion efficiency of internal combustion engines, but there is a lack of effective solutions for monitoring carbon deposition in the exhaust passage and its impact on the intake throttle valve opening degree. SUMMARY

[0005] To solve the above problems, the purpose of the embodiments of the present application is to provide a method and device for correcting throttle valve opening degree based on exhaust passage carbon deposition amount.

[0006] A method for correcting throttle valve opening degree based on exhaust passage carbon deposition amount, comprising:

[0007] Step 1: Collecting particulate matter emissions in the exhaust of the target engine under different speeds and fuel injection amounts to form an exhaust particulate matter emission chart;

[0008] Step 2: Calculating the cumulative emission amount of exhaust particulate matter based on the exhaust particulate matter emission chart and the operating time of the engine;

[0009] Step 3: Calculating the exhaust passage particulate matter adhesion amount coefficient based on the particulate matter emissions in the exhaust;

[0010] Step 4: Calculating the particulate matter adhesion mass in the exhaust passage based on the exhaust passage particulate matter adhesion amount coefficient and the cumulative emission amount of exhaust particulate matter;

[0011] Step 5: calculating the correction value of the exhaust passage flow coefficient according to the accumulated exhaust particulate matter in the exhaust passage;

[0012] Step 6: correcting the throttle opening of the engine by using the correction value of the exhaust passage flow coefficient to optimize the engine performance.

[0013] Preferably, 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 exhaust particulate matter emission as the z-axis.

[0014] Preferably, in Step 2, the accumulated exhaust particulate matter emission calculation formula is:

[0015] The accumulated exhaust particulate matter emission = the output power of the engine * the exhaust particulate matter emission in the exhaust * the engine operation time.

[0016] Preferably, in Step 3, the exhaust passage particulate matter attachment coefficient calculation formula is:

[0017] The exhaust passage particulate matter attachment coefficient = the exhaust passage particulate matter attachment mass per unit time / (the exhaust passage particulate matter attachment mass per unit time + the exhaust particulate matter emission per unit time).

[0018] Preferably, in Step 4, the exhaust passage particulate matter attachment mass calculation formula is:

[0019] The exhaust passage particulate matter attachment mass = the exhaust passage particulate matter attachment coefficient * the accumulated exhaust particulate matter emission.

[0020] Preferably, Step 6: correcting the throttle opening of the engine by using the correction value of the exhaust passage flow coefficient to optimize the engine performance, comprises:

[0021] Under different correction values of the exhaust passage flow coefficient, the intake throttle opening of the engine is continuously adjusted, and the throttle opening corresponding to the optimal engine operating condition is the corrected engine throttle opening.

[0022] The application also provides a device for correcting the intake throttle opening based on the exhaust passage carbon deposition amount, comprising:

[0023] An exhaust particulate matter collection module is configured to collect the exhaust particulate matter emission of a target engine under different speeds and fuel injection amounts, and form an exhaust particulate matter emission chart.

[0024] An accumulated exhaust particulate matter emission calculation module is configured to calculate the accumulated exhaust particulate matter emission based on the exhaust particulate matter emission chart and the engine operation time.

[0025] The exhaust passage particulate matter adhesion amount coefficient calculation module is configured to calculate the exhaust passage particulate matter adhesion amount coefficient according to particulate matter emission in exhaust gas;

[0026] The exhaust passage particulate matter adhesion mass acquisition module is configured to calculate particulate matter adhesion mass in the exhaust passage according to the exhaust passage particulate matter adhesion amount coefficient and cumulative particulate matter emission of the exhaust gas;

[0027] The exhaust passage flow coefficient correction module is configured to calculate a correction value of the exhaust passage flow coefficient according to the particulate matter adhesion mass in the exhaust passage;

[0028] The intake throttle valve opening correction module is configured to correct the throttle valve opening of the engine by using the correction value of the exhaust passage flow coefficient to optimize the engine performance.

[0029] 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 being connected through the bus, characterized in that the computer program, when executed by the processor, implements the steps of the method for correcting the throttle valve opening based on the exhaust passage carbon deposition amount.

[0030] The application further provides a computer readable storage medium, which stores a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method for correcting the throttle valve opening based on the exhaust passage carbon deposition amount.

[0031] According to the specific embodiments of the application, the following technical effects are achieved:

[0032] The application relates to a method for correcting the throttle valve opening based on the exhaust passage carbon deposition amount, compared with the prior art, the application can dynamically adjust the throttle valve opening according to exhaust particulate matter emission under different rotating speeds and fuel injection amounts, so as to adapt to different working conditions and ensure that the engine works efficiently under various operating conditions.

[0033] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and easy to understand, 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

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only constitute 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.

[0035] Figure 1 A method flowchart for correcting throttle valve opening degree based on exhaust passage carbon deposition amount is provided for the present application.

[0036] Figure 2 An engine working principle diagram is provided for the present application. 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", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which 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 broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be 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 Figures 1-2 A method for correcting throttle valve opening degree based on exhaust passage carbon deposition amount, comprising:

[0041] Step 1: Collecting particulate matter emissions in the exhaust of the target engine under different speeds and fuel injection amounts to form an exhaust particulate matter emission chart;

[0042] In actual 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 using sensors to detect these parameters, the corresponding engine working condition parameters 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 after 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 port of the engine is disassembled, the particulate matter attached in the exhaust port is collected and then weighed with high precision to obtain the mass M_soot_exh_port of the particulate matter attached in the exhaust port, 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 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 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]

[0048] Step 2: Calculate the cumulative emission amount of exhaust particulate matter based on the exhaust particulate matter emission chart and the working time of the engine;

[0049] In step 2, the present application first needs to construct an engine output power chart 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.

[0050] Table 2 Engine output power chart

[0051]

[0052] Then, the cumulative emission amount of exhaust particulate matter is calculated by using the cumulative emission amount of exhaust particulate matter formula: cumulative emission amount of exhaust particulate matter = engine output power * particulate matter emission in exhaust gas * engine working time.

[0053] Step 3: Calculate the exhaust port particulate matter attachment amount coefficient according to the particulate matter emission in the exhaust gas;

[0054] In step 3, the temperature in the exhaust pipe is obtained by the temperature sensor in the exhaust pipe, and then a speed, oil amount, and exhaust temperature chart 3 is calibrated, and the exhaust flow can be obtained by adding the intake flow (charge efficiency model or Maf sensor test) and the fuel injection amount, and then a exhaust particulate matter attachment amount coefficient chart 4 based on the exhaust temperature and the exhaust flow is calibrated.

[0055] Table 3 Exhaust temperature chart

[0056]

[0057]

[0058] Table 4 Exhaust particulate matter adhesion amount coefficient chart

[0059]

[0060] In the step 3, the exhaust passage particulate matter adhesion amount coefficient calculation formula is:

[0061] Exhaust passage particulate matter adhesion amount coefficient = exhaust passage adhesion particulate matter mass per unit time / (exhaust passage adhesion particulate matter mass per unit time + exhaust particulate matter emission per unit time).

[0062] Step 4: Calculate the exhaust passage particulate matter adhesion mass according to the exhaust passage particulate matter adhesion amount coefficient and the cumulative exhaust particulate matter emission amount;

[0063] In the step 4, the exhaust passage particulate matter adhesion mass calculation formula is:

[0064] Exhaust passage particulate matter adhesion mass = exhaust passage particulate matter adhesion amount coefficient * cumulative exhaust particulate matter emission amount.

[0065] Step 5: Calculate the modified value of the exhaust passage flow coefficient according to the exhaust passage particulate matter adhesion mass;

[0066] Based on the exhaust passage particulate matter adhesion mass calculated in the previous steps, an exhaust passage particulate matter adhesion amount vs. exhaust passage flow coefficient modification coefficient table can be calibrated, with the horizontal axis being the exhaust passage particulate matter adhesion amount and the Y axis being the exhaust passage flow coefficient modification coefficient (indicating the level of decline in the flow capacity of the exhaust passage with the increase of the particulate matter inside the exhaust passage). The exhaust passage flow coefficient modification coefficient table is as follows:

[0067] Table 5 Exhaust passage flow coefficient modification coefficient table

[0068] Particulate matter attached mass in exhaust passage 0 5 10 15 20 Correction factor for exhaust passage flow coefficient 1 0.98 0.96 0.94 0.92

[0069] Step 6: Modify the throttle opening of the engine using the modified value of the exhaust passage flow coefficient to optimize the engine performance.

[0070] In the step 6, under different modified values of the exhaust passage flow coefficient, the intake throttle opening of the engine is continuously adjusted so that the working condition of the engine reaches the optimal throttle opening corresponding to the modified throttle opening of the engine.

[0071] In the present application, due to the carbon accumulation inside the exhaust passage, the flow capacity of the passage will decrease, which will cause the intake air amount to decrease and the cylinder residual exhaust gas fraction to increase, thereby causing the exhaust gas temperature to rise, so the opening degree of the intake and exhaust throttle valves in the heat management mode under the calibration of the exhaust passage without considering the carbon particle accumulation in the exhaust passage is too small, thereby excessively deteriorating the engine performance, and therefore it is necessary to correct the opening degree of the intake throttle valve in the heat management mode based on the amount of carbon deposition inside the exhaust passage, as follows:

[0072] Based on the exhaust passage flow coefficient correction factor calibrated in step 5, a correction table of the exhaust passage flow coefficient correction factor and the intake throttle valve is calibrated, and when the engine is in the heat management mode (the exhaust temperature sensor at the SCR inlet is activated below 250 degrees Celsius, and the 250 degrees is a calibratable parameter), the original opening degree of the intake throttle valve is corrected using the correction factor of the intake throttle valve opening degree, and the performance can be optimized. If the engine is equipped with an exhaust throttle valve, this method is also suitable for the opening correction of the exhaust throttle valve.

[0073] Table 6 Correction table of intake throttle valve

[0074] Correction factor for exhaust passage flow coefficient 1 0.98 0.96 0.94 0.92 Correction factor for intake throttle valve 1 1.15 1.18 1.25 1.35

[0075] Table 7 Intake throttle valve original opening calibration table

[0076]

[0077]

[0078] The horizontal axis in table 6 is the exhaust passage flow coefficient correction factor, and the vertical axis is the correction factor of the intake throttle valve opening degree (indicating that as the amount of particulate matter inside the exhaust passage increases, the flow capacity of the exhaust passage itself will decrease, thereby the intake air amount will decrease and the exhaust gas temperature will rise, so the intake throttle valve opening degree can be appropriately increased to ensure efficient operation of the engine.

[0079] The present application also provides a device for correcting the opening degree of the intake throttle valve based on the amount of carbon deposition in the exhaust passage, comprising:

[0080] An exhaust particulate matter collection module is used to collect the particulate matter emissions in the exhaust gas of the target engine under different speeds and fuel injection amounts, and form an exhaust particulate matter emission chart;

[0081] An accumulated exhaust particulate matter emission calculation module is used to calculate the accumulated exhaust particulate matter emission based on the exhaust particulate matter emission chart and the working time of the engine;

[0082] An exhaust passage particulate matter adhesion amount coefficient calculation module is used to calculate the exhaust passage particulate matter adhesion amount coefficient according to the particulate matter emission in the exhaust gas;

[0083] An exhaust passage particulate matter attached mass acquisition module is configured to calculate the particulate matter attached mass in the exhaust passage according to the exhaust passage particulate matter attached mass coefficient and the cumulative emission amount of the exhaust passage particulate matter;

[0084] An exhaust passage flow coefficient correction module is configured to calculate a correction value of the exhaust passage flow coefficient according to the particulate matter attached mass in the exhaust passage;

[0085] An intake throttle valve opening correction module is configured to correct the throttle valve opening of the engine by using the correction value of the exhaust passage flow coefficient to optimize the engine performance.

[0086] Compared with the prior art, the device for correcting the intake throttle valve opening based on the exhaust passage carbon deposit amount has the same beneficial effects as the method for correcting the throttle valve opening based on the exhaust passage carbon deposit amount, and thus repeated description is omitted.

[0087] 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 being connected through the bus, characterized in that the computer program, when executed by the processor, implements the steps in the method for correcting the throttle valve opening based on the exhaust passage carbon deposit amount, and the electronic device has the same beneficial effects as the method for correcting the throttle valve opening based on the exhaust passage carbon deposit amount.

[0088] The application further provides a computer readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps in the method for correcting the throttle valve opening based on the exhaust passage carbon deposit amount, and the computer readable storage medium has the same beneficial effects as the method for correcting the throttle valve opening based on the exhaust passage carbon deposit amount.

[0089] The above description is merely a specific implementation of the application, and the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacement 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 correcting throttle valve opening based on the amount of carbon deposits in the exhaust duct, characterized in that, include: Step 1: Collect particulate matter emissions from the exhaust of the target engine under different speeds and fuel injection quantities to generate exhaust particulate matter emission charts; Step 2: Calculate the cumulative emissions of exhaust particulate matter based on the exhaust particulate matter emission chart and engine operating time; Step 3: Calculate the particulate matter adhesion coefficient in the exhaust duct based on the particulate matter emissions in the exhaust; In step 3, the formula for calculating the particulate matter adhesion coefficient in the exhaust duct is: Exhaust duct particulate matter adhesion coefficient = mass of particulate matter adhering to the exhaust duct per unit time / (mass of particulate matter adhering to the exhaust duct per unit time + particulate matter emission in the exhaust per unit time). Step 4: Calculate the particulate matter adhering to the exhaust duct based on the particulate matter adhesion coefficient and the cumulative emission of exhaust particulate matter; In step 4, the formula for calculating the mass of particulate matter adhering in the exhaust duct is: The mass of particulate matter adhering to the exhaust duct = the particulate matter adhering coefficient of the exhaust duct * the cumulative emission of exhaust particulate matter; Step 5: Calculate the correction value of the exhaust duct flow coefficient based on the mass of particulate matter adhering in the exhaust duct; Step 6: Use the correction value of the exhaust flow coefficient to correct the engine throttle valve opening in order to optimize engine performance; Step 6: Correcting the engine's throttle valve opening using the exhaust flow coefficient correction value to optimize engine performance includes: Under different exhaust flow coefficient correction values, the intake throttle valve opening of the engine is continuously adjusted to achieve the optimal engine operating condition. The corresponding throttle valve opening is the corrected engine throttle valve opening.

2. The method for correcting the throttle valve opening based on the amount of carbon deposits in the exhaust duct according to claim 1, characterized in that, In step 1, the exhaust particulate emission chart is based on engine speed. x Shaft, with oil injection quantity as y Shaft, particulate matter emissions in exhaust are z Constructed by axes.

3. The method for correcting the throttle valve opening based on the amount of carbon deposits in the exhaust duct according to claim 2, characterized in that, In step 2, the cumulative emission of exhaust particulate matter is calculated using the following formula: Cumulative emissions of exhaust particulate matter = engine output power * particulate matter emissions in exhaust * engine operating time.

4. A device for correcting the intake throttle valve opening based on the amount of carbon deposits in the exhaust duct, characterized in that, include: The exhaust particulate matter collection module is used to collect particulate matter emissions from the exhaust of the target engine under different speeds and fuel injection quantities, and generate exhaust particulate matter emission charts. The cumulative emission calculation module for exhaust particulate matter is used to calculate the cumulative emissions of exhaust particulate matter based on the exhaust particulate matter emission chart and the engine's operating time. The exhaust duct particulate matter adhesion coefficient calculation module is used to calculate the exhaust duct particulate matter adhesion coefficient based on particulate matter emissions in the exhaust gas; the formula for calculating the exhaust duct particulate matter adhesion coefficient is: Exhaust duct particulate matter adhesion coefficient = mass of particulate matter adhering to the exhaust duct per unit time / (mass of particulate matter adhering to the exhaust duct per unit time + particulate matter emission in the exhaust per unit time). The exhaust duct particulate matter adhesion mass acquisition module is used to calculate the particulate matter adhesion mass in the exhaust duct based on the exhaust duct particulate matter adhesion coefficient and the cumulative emission of exhaust particulate matter. The formula for calculating the mass of particulate matter adhering in the exhaust duct is: The mass of particulate matter adhering to the exhaust duct = the particulate matter adhering coefficient of the exhaust duct * the cumulative emission of exhaust particulate matter; The exhaust duct flow coefficient correction module is used to calculate the correction value of the exhaust duct flow coefficient based on the particulate matter adhesion mass in the exhaust duct. The intake throttle valve opening correction module is used to correct the engine throttle valve opening using the correction value of the exhaust flow coefficient in order to optimize engine performance. This includes using the correction value of the exhaust flow coefficient to adjust the engine's throttle valve opening in order to optimize engine performance, including: Under different exhaust flow coefficient correction values, the intake throttle valve opening of the engine is continuously adjusted to achieve the optimal engine operating condition. The corresponding throttle valve opening is the corrected engine throttle valve opening.

5. 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, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for correcting the throttle valve opening based on the amount of carbon deposits in the exhaust duct as described in any one of claims 1-3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for correcting the throttle valve opening based on the amount of carbon deposits in the exhaust duct as described in any one of claims 1-3.

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