An air intake heating grid self-cleaning method and system based on road spectrum durability test

Abstract

The application discloses a kind of based on road spectrum endurance test's intake heating grid self-cleaning method and system, it is related to intake system cleaning technical field.The method includes the following steps: obtaining the speed and torque of engine, and according to the speed and torque, calculate the engine smoke degree;Road spectrum endurance test is carried out to engine, and the carbon deposition adhesion of heating grid is calculated by weighing;According to the construction engine smoke degree, the carbon deposition adhesion of heating grid and the road spectrum endurance test result, build the carbon deposition model of intake heating grid;The carbon deposition on heating grid is calculated using the carbon deposition model of intake heating grid, and according to the calculation result, the carbon deposition is heated in combination with vehicle engine state.The application further reduces the cleaning cost under the premise of not introducing external equipment, and realizes efficient carbon deposition cleaning.

Description

Technical Field

[0001] This invention relates to the field of intake system cleaning technology, and in particular to a self-cleaning method and system for intake heating grilles based on road spectrum durability testing. Background Technology

[0002] In EGR engines, some of the exhaust gas from combustion processes is recirculated into the intake manifold and mixed with fresh air before entering the cylinders for further combustion. Carbon deposits from this combustion easily adhere to the surface of the heating grille, and over time, this can affect intake efficiency. While there are existing methods for removing carbon deposits, they all require additional cleaning equipment or reagents. For example, patent CN103639156A describes a method for removing carbon deposits from aircraft engine nozzles, employing a series of methods including mechanical scraping, high-pressure oil impact, chemical cleaning, and ultrasonic cleaning. However, these methods all require external mechanical equipment or additional chemical reagents, making the cleaning process complex and necessitating the disassembly of the components being cleaned. Therefore, their application is limited, significantly increasing cleaning costs.

[0003] Studies have found that carbon deposits produced by EGR engines can be burned off at 600℃, while the temperature of the intake grille can reach 850℃ or higher. Therefore, carbon deposits can be periodically removed by heating the intake grille. However, the large amount of carbon deposits on the intake grille is difficult to calculate without removing it, and prolonged high-temperature heating not only increases battery consumption but also affects the lifespan of the grille. Therefore, how to accurately calculate the amount of carbon deposits without removing the intake grille and how to perform adaptive mileage cleaning based on the amount of carbon deposits have become urgent technical problems to be solved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a self-cleaning method and system for intake heating grilles based on road spectrum durability tests. The method calculates the amount of carbon deposits on the heating grilles in real time according to road spectrum conditions, and uses a carbon deposit amount model to perform adaptive mileage-based carbon cleaning based on the amount of carbon deposits. This further reduces cleaning costs and achieves efficient carbon deposit cleaning without introducing external equipment.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] The first aspect of this invention provides a self-cleaning method for an intake heating grille based on a road spectrum durability test, comprising the following steps:

[0007] Obtain the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque;

[0008] A road spectrum durability test was conducted on the engine, and the amount of carbon deposits on the heating grille was calculated by weighing.

[0009] A carbon buildup model for the intake air heating grille was constructed based on the engine smoke density, carbon deposit adhesion amount of the heating grille, and road spectrum durability test results.

[0010] The amount of carbon deposits on the intake heating grille was calculated using a carbon deposit model.

[0011] The carbon deposits are heated based on the calculation results and the vehicle engine status. The heating time inflection point is calculated based on the relationship between heating time and carbon adhesion amount, and the heating time is confirmed based on the relationship between the heating time inflection point and the engine power deviation requirement.

[0012] Furthermore, the engine smoke opacity was calculated by conducting universal characteristic tests on an engine bench.

[0013] Furthermore, the carbon deposit amount of the heating grille calculated by weighing is equal to the difference between the weighing result of the intake heating grille after the road spectrum durability test and the weighing result of the intake heating grille before the road spectrum durability test.

[0014] Furthermore, a road spectrum durability test was conducted on the engine according to the engine's transient driving cycle.

[0015] Furthermore, the specific steps for constructing the intake air heating grille carbon deposit model based on the engine smoke density, carbon deposit adhesion amount of the heating grille, and road spectrum durability test results are as follows:

[0016] A preliminary carbon buildup model for the intake heating grille was constructed based on smoke density and the amount of carbon deposits on the grille.

[0017] The correction factor was calculated based on the road spectrum durability test results.

[0018] The initial intake air heater grille carbon buildup model was corrected using correction factors to obtain the final intake air heater grille carbon buildup model.

[0019] Furthermore, the revised carbon buildup model for the intake air heater grille is as follows:

[0020] Y=M / Σf(nk,mk)*Σf(ni,mi);

[0021] Where Y represents the predicted amount of carbon deposits, M represents the carbon deposit weighing result from the road spectrum durability test, ni and mi represent the engine speed and torque values ​​collected at the i-th second, respectively, and nk and mk represent the engine speed and torque values ​​at the k-th second in the road spectrum durability test, respectively.

[0022] Furthermore, the specific steps for calculating the amount of carbon deposits on the intake grille using the intake grille carbon deposit model are as follows:

[0023] Set limits on the amount of carbon deposits adhering to the surface;

[0024] The amount of carbon deposits on the current heating grille is calculated based on the carbon deposit model of the intake heating grille.

[0025] If the calculated result is greater than or equal to the limit for carbon deposit adhesion, it is determined that the carbon deposit needs to be burned.

[0026] Furthermore, based on the calculation results and the vehicle's engine condition, the specific steps for heating carbon deposits are as follows:

[0027] If the intake grille carbon deposit model determines that the carbon deposits need to be burned, and the engine is idling, then the intake grille will be heated to burn off the carbon deposits. If the intake grille carbon deposit model determines that the carbon deposits need to be burned, but the vehicle is still running, then the intake grille will be heated to burn off the carbon deposits the next time the vehicle is powered on.

[0028] Furthermore, the engine power degradation limit is calculated by using the relationship between engine power and carbon deposit content, and the carbon deposit content limit is confirmed based on the engine power degradation limit.

[0029] A second aspect of the present invention provides a self-cleaning system for an intake heating grille based on a road spectrum durability test, comprising:

[0030] The smoke opacity calculation module is configured to acquire the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque.

[0031] The road spectrum test module is configured to perform road spectrum durability tests on the engine and weigh and calculate the amount of carbon deposits on the heated grille.

[0032] The model building module is configured to build an intake air heating grille carbon buildup model based on the engine smoke density, the amount of carbon deposits on the heating grille, and the road spectrum durability test results.

[0033] The carbon deposit cleaning module is configured to calculate the amount of carbon deposits on the intake grille using a carbon deposit model, and heat the carbon deposits based on the calculation results and the vehicle engine status. Specifically, the heating time inflection point is calculated based on the relationship between heating time and carbon deposit amount, and the heating time is confirmed based on the relationship between the heating time inflection point and the engine power deviation requirement.

[0034] The above one or more technical solutions have the following beneficial effects:

[0035] This invention discloses a self-cleaning method and system for intake air heating grilles based on road spectrum durability testing. Utilizing the principle that the heating grille can reach the carbon deposit combustion temperature, a carbon deposit model of the intake air heating grille is constructed. The amount of carbon deposits adhering to the heating grille is monitored in real time. When carbon deposits accumulate to a certain level, the heating grille is used to burn off the carbon deposits. Thus, without introducing external equipment, through calculation of optimal combustion time and optimal carbon deposit adhering amount, adaptive mileage-based combustion cleaning of carbon deposits is achieved, resulting in excellent effects such as improved carbon deposit cleaning efficiency, reduced costs, and extended engine life. Attached Figure Description

[0036] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0037] Figure 1 This is a flowchart of the self-cleaning method for the intake heating grille based on road spectrum durability test in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the smoke opacity of the engine at different speeds and torques in Embodiment 1 of the present invention;

[0039] Figure 3 This is a schematic diagram illustrating the relationship between engine power, heating time, and carbon deposition in Embodiment 1 of the present invention. Detailed Implementation

[0040] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0041] Terminology Explanation:

[0042] Intake heating grille: A device that uses resistance heating to rapidly increase the intake air temperature, which can reach 850°C or higher.

[0043] Carbon deposits: EGR exhaust contains carbon soot, which easily adheres to the surface of the heating grille, affecting intake efficiency. It can be burned off at 600℃.

[0044] Example 1:

[0045] Embodiment 1 of the present invention provides a self-cleaning method for intake heating grilles based on road spectrum durability testing, such as... Figure 1As shown, the smoke opacity at the intake grille location under universal operating conditions is first tested on a bench, followed by a road spectrum durability test to measure the carbon buildup on the grille. A carbon buildup model is established based on the universal smoke opacity, the road spectrum durability test results, and the carbon buildup weight. The tested market vehicle calculates the amount of carbon buildup on the grille according to the carbon buildup model, determining whether the amount reaches the specified value. If so, it checks if the engine is idling and the vehicle speed is 0; otherwise, it continues to monitor the amount of carbon buildup on the grille. When the engine is idling and the vehicle speed is 0, the grille is heated to burn off the carbon buildup for t minutes. Otherwise, the vehicle is stopped and then powered on again before the grille is heated to burn off the carbon buildup for t minutes. Carbon buildup can be removed at 600℃, and the intake grille temperature can reach 850℃ and above, allowing for surface carbon removal through heating. This invention's carbon cleaning method calculates the amount of carbon buildup on the grille in real time based on road spectrum conditions, rather than mileage. Therefore, it can monitor the amount of carbon buildup on the grille in real time, outputting optimal power to achieve efficient carbon buildup combustion.

[0046] This embodiment specifically includes the following steps:

[0047] Step 1: Obtain the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque.

[0048] In this embodiment, engine smoke opacity is calculated by conducting a universal characteristic test on an engine bench. During the universal characteristic test, the engine speed n ranges from 600 to 1900 r / min, with intervals of 100 r / min; the torque m ranges from 100 to 2600 N·m, with intervals of 200 N·m. The smoke opacity corresponding to the engine at different speeds and torques is as follows: Figure 2 As shown.

[0049] Given engine speed n, torque m, and smoke opacity y, the functional relationship between smoke opacity and engine speed and torque is constructed as follows:

[0050] y=f(n,m)=a1*ni2+a2*mi2+a3*ni*mi+a4ni+a5*mi+a6

[0051] Where ni and mi represent the engine speed and torque values ​​at the i-th second, respectively, and the values ​​of coefficients a1, a2, a3, a4, a5 and a6 can be obtained by the least squares method.

[0052] Step 2: Conduct a road spectrum durability test on the engine and weigh and calculate the amount of carbon deposits on the heating grille.

[0053] In this embodiment, the engine is subjected to a 500-hour road spectrum durability test according to the engine's transient driving cycle. The amount of carbon deposit M on the heating grille calculated by weighing during the road spectrum durability test is equal to the difference between the weighing result M2 of the intake heating grille after the road spectrum durability test and the weighing result M1 of the intake heating grille before the road spectrum durability test: M = M2 - M1.

[0054] The carbon deposit amount Y' = Σf(nk,mk) is predicted for 500h road test durability, where nk and mk are the engine speed and torque values ​​at the kth second during the 500h road test durability.

[0055] Step 3: Construct an intake air heating grille carbon buildup model based on the engine smoke density, carbon deposit amount of the heating grille, and road spectrum durability test results.

[0056] In this embodiment, the specific steps are as follows:

[0057] (1) Construct a preliminary carbon deposition model for the intake heating grille based on smoke opacity and carbon deposition amount:

[0058] Y = Σf(ni, mi),

[0059] Where ni and mi represent the engine's speed and torque per second, respectively.

[0060] (2) Calculate the correction factor A based on the road spectrum durability test results:

[0061] A = M / Σf(nk,mk),

[0062] Where A is the correction factor, M is the carbon deposit adhesion weight result of the road spectrum durability test, and nk and mk represent the engine speed and torque values ​​per second in the road spectrum durability test, respectively.

[0063] The initial intake air heater grille carbon buildup model was corrected using correction factors to obtain the final intake air heater grille carbon buildup model. The corrected intake air heater grille carbon buildup model is as follows:

[0064] Y=M / Σf(nk,mk)*Σf(ni,mi);

[0065] Where Y represents the predicted amount of carbon deposits, M represents the carbon deposit weighing result from the road spectrum durability test, ni and mi represent the collected engine speed and torque values ​​per second, respectively, and nk and mk represent the engine speed and torque values ​​per second in the road spectrum durability test, respectively.

[0066] Step 4: Calculate the amount of carbon deposits on the intake grille using a carbon deposit model. Based on the calculation results and the vehicle's engine condition, heat the carbon deposits. Specifically, calculate the heating time inflection point based on the relationship between heating time and carbon deposit content, and confirm the heating time based on the relationship between the heating time inflection point and the required engine power deviation. Calculate the engine power degradation limit using the relationship between engine power and carbon deposit content, and confirm the carbon deposit degradation limit based on the engine power degradation limit.

[0067] In this embodiment, the market vehicle determines whether to heat the air intake grille to burn off carbon deposits based on the calculation results of the carbon deposit model. The specific steps are as follows:

[0068] Set limits on the amount of carbon deposits adhering to the surface;

[0069] The amount of carbon deposits on the current heating grille is calculated based on the carbon deposit model of the intake heating grille.

[0070] If the calculated result is greater than or equal to the limit for carbon deposit adhesion, it is determined that the carbon deposit needs to be burned.

[0071] If the intake grille carbon deposit model determines that carbon deposits need to be burned, and the engine is idling, then the intake grille will be heated to burn off the carbon deposits for t minutes. If the intake grille carbon deposit model determines that carbon deposits need to be burned off, but the vehicle is still running, then the intake grille will be heated to burn off the carbon deposits the next time the vehicle is powered on, for t minutes.

[0072] Confirmation of Adhesion Limits: Plot the relationship between engine power and carbon adhesion content. Confirm the adhesion limits based on the engine power degradation limits. Figure 3 As shown, the specific functional relationship is obtained using the least squares method:

[0073] P(Y) = b1 × Y2 + b2 × Y + b3

[0074] Where P is the engine power, Y is the carbon content, b1 and b2 are coefficients, and b3 is a constant.

[0075] Combustion time t confirmation: Plot the relationship between heating time and carbon deposition. Determine the heating time based on the inflection point of the heating time and the engine power deviation requirement. If the engine power corresponding to the inflection point of the heating time is higher than the deviation requirement, then the heating time is the inflection point time; if the engine power corresponding to the inflection point of the heating time is lower than the deviation requirement, then the heating time is the heating time value corresponding to the engine power deviation value. Figure 3 As shown, the specific functional relationship is obtained using the least squares method:

[0076] Y(t) = c1×t² + c2×t + C3,

[0077] Where Y is the carbon content, t is the heating time, c1 and c2 are coefficients, and c3 is a constant.

[0078] Example 2:

[0079] Embodiment 2 of the present invention provides a self-cleaning system for an intake heating grille based on a road spectrum durability test, comprising:

[0080] The smoke opacity calculation module is configured to acquire the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque.

[0081] The road spectrum test module is configured to perform road spectrum durability tests on the engine and weigh and calculate the amount of carbon deposits on the heated grille.

[0082] The model building module is configured to build an intake air heating grille carbon buildup model based on the engine smoke density, the amount of carbon deposits on the heating grille, and the road spectrum durability test results.

[0083] The carbon deposit cleaning module is configured to calculate the amount of carbon deposits on the intake grille using a carbon deposit model, and then heat the carbon deposits based on the calculation results and the vehicle's engine status.

[0084] The steps involved in the above embodiment two correspond to those in embodiment one. For specific implementation details, please refer to the relevant description section of embodiment one.

[0085] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A self-cleaning method for intake heating grilles based on road spectrum durability testing, characterized in that, Includes the following steps: Obtain the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque; A road spectrum durability test was conducted on the engine, and the amount of carbon deposits on the heating grille was calculated by weighing. Based on the engine smoke opacity, the amount of carbon deposits on the heating grille, and the road spectrum durability test results, an intake heating grille carbon deposit model is constructed. Specifically, a preliminary intake heating grille carbon deposit model is constructed based on the smoke opacity and the amount of carbon deposits on the heating grille; a correction coefficient is calculated based on the road spectrum durability test results; and the preliminary intake heating grille carbon deposit model is corrected using the correction coefficient to obtain the final intake heating grille carbon deposit model. The amount of carbon deposits on the intake grille is calculated using a carbon deposit model. Based on the calculation results and the vehicle's engine status, the carbon deposits are heated. Specifically, the heating time inflection point is calculated based on the relationship between heating time and carbon deposit content, and the heating time is confirmed based on the relationship between the heating time inflection point and the engine power deviation requirement. If the intake grille carbon deposit model determines that the carbon deposits need to be burned, and the engine is idling, then the intake grille is heated to burn off the carbon deposits. If the intake grille carbon deposit model determines that the carbon deposits need to be burned off, but the vehicle is still running, then the intake grille is heated to burn off the carbon deposits the next time the vehicle is powered on. The specific steps for calculating the amount of carbon deposits on the intake grille using the intake grille carbon deposit model include: Set limits on the amount of carbon deposits adhering to the surface; The amount of carbon deposits on the current heating grille is calculated based on the carbon deposit model of the intake heating grille. If the calculated result is greater than or equal to the limit for carbon deposit adhesion, it is determined that the carbon deposit needs to be burned.

2. The self-cleaning method for intake heating grilles based on road spectrum durability testing as described in claim 1, characterized in that, Engine smoke opacity is calculated by conducting universal characteristic tests on an engine bench.

3. The self-cleaning method for intake heating grilles based on road spectrum durability testing as described in claim 1, characterized in that, The carbon deposit amount of the heating grille calculated by weighing is equal to the difference between the weighing result of the intake heating grille after the road spectrum durability test and the weighing result of the intake heating grille before the road spectrum durability test.

4. The self-cleaning method for intake heating grilles based on road spectrum durability testing as described in claim 1, characterized in that, The engine was subjected to a road spectrum durability test based on the engine's transient driving cycle.

5. The self-cleaning method for intake heating grilles based on road spectrum durability testing as described in claim 1, characterized in that, The revised carbon buildup model for the intake heater grille is as follows: ； Where Y represents the predicted amount of carbon deposits, M represents the carbon deposit weighing result from the road spectrum durability test, ni and mi represent the engine speed and torque values ​​collected at the i-th second, respectively, and nk and mk represent the engine speed and torque values ​​at the k-th second in the road spectrum durability test, respectively.

6. The self-cleaning method for intake heating grilles based on road spectrum durability testing as described in claim 1, characterized in that, The engine power degradation limit is calculated by using the relationship between engine power and carbon deposit content, and the carbon deposit content limit is confirmed based on the engine power degradation limit.

7. A self-cleaning system for an intake heating grille based on road spectrum durability testing, characterized in that, The intake heating grille self-cleaning method based on road spectrum durability test as described in any one of claims 1-6 is used to perform intake heating grille self-cleaning, wherein the intake heating grille self-cleaning system comprises: The smoke opacity calculation module is configured to acquire the engine speed and torque, and calculate the engine smoke opacity based on the speed and torque. The road spectrum test module is configured to perform road spectrum durability tests on the engine and weigh and calculate the amount of carbon deposits on the heated grille. The model building module is configured to build an intake air heating grille carbon buildup model based on the engine smoke density, the amount of carbon deposits on the heating grille, and the road spectrum durability test results. The carbon deposit cleaning module is configured to calculate the amount of carbon deposits on the intake grille using a carbon deposit model, and heat the carbon deposits based on the calculation results and the vehicle engine status. Specifically, the heating time inflection point is calculated based on the relationship between heating time and carbon deposit amount, and the heating time is confirmed based on the relationship between the heating time inflection point and the engine power deviation requirement.

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