Method, device and equipment for detecting aging of three-way catalyst and storage medium

Abstract

The application discloses a kind of aging detection method, device, equipment and storage medium of three-way catalyst, when the time length of engine is in reverse drag condition exceeds set time length, it is considered that the oxygen of measured three-way catalyst has been stored full, control engine exits reverse drag condition and starts to restore fuel / oil / gas, the temperature of measured three-way catalyst is acquired in real time, the actual temperature rise value of measured three-way catalyst is calculated from the derivative of the temperature of measured three-way catalyst about time when starting to restore fuel / oil / gas from stopping reverse drag condition to non-positive number from positive number, the actual temperature rise value is compared with theoretical temperature rise value, theoretical temperature rise value indicates the temperature rise value of fresh three-way catalyst from the derivative of the temperature of fresh three-way catalyst about time when starting to restore fuel / oil / gas from stopping reverse drag condition to non-positive number from positive number, i.e. the aging degree of measured three-way catalyst can be judged, it is helpful to replace aging three-way catalyst in time, ensure the exhaust treatment effect of vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of three-way catalysts, and particularly relates to a three-way catalyst aging detection method, device, equipment and storage medium. BACKGROUND

[0002] The three-way catalyst is the most important off-purification device installed in the exhaust system of a vehicle, which can convert carbon monoxide (CO), nitrogen oxides (NOx) and unburned hydrocarbons (HC) in vehicle exhaust into harmless carbon dioxide (CO2), water (H2O) and nitrogen (N2) through oxidation and reduction, so as to purify the vehicle exhaust. x

[0003] However, as the engine runs for a long time, the catalyst in the three-way catalyst may be covered by heavy metals and impurities in the exhaust gas, resulting in aging phenomenon, which seriously affects the efficiency of the three-way catalyst, causes vehicle exhaust emission deterioration, and causes excessive pollution emission, etc. Therefore, it is necessary to detect the aging condition of the three-way catalyst in time.

[0004] Therefore, how to detect the aging state of the three-way catalyst so as to replace the aged three-way catalyst in time becomes a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the embodiments of the present application provide a three-way catalyst detection method, device, equipment and storage medium to detect the aging state of the three-way catalyst, which helps to replace the aged three-way catalyst in time and ensures the exhaust treatment effect of the vehicle.

[0006] To achieve the above purpose, the embodiments of the present application provide the following technical solutions:

[0007] A three-way catalyst aging detection method, comprising:

[0008] Timing starts from the engine entering the reverse drag working condition, and it is judged whether the time length of the engine in the reverse drag working condition exceeds the set time length, if yes, the engine is controlled to exit the reverse drag working condition and start to restore the fuel / oil supply;

[0009] From the start of stopping the reverse drag working condition to restore the fuel / oil supply, the temperature of the three-way catalyst to be tested is acquired in real time, and the temperature change relationship of the three-way catalyst to be tested with respect to time is obtained;

[0010] ​derivative of the temperature of the to-be-tested three-way catalyst with respect to time is changed from a positive number to a non-positive number, if yes, calculating a temperature rise value of the to-be-tested three-way catalyst from the start of resuming fuel / oil supply to the stop reverse-dragging working condition to the time when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time is changed from a positive number to a non-positive number, and recording the temperature rise value as an actual temperature rise value;

[0011] comparing the actual temperature rise value and a theoretical temperature rise value, judging the aging degree of the to-be-tested three-way catalyst, the theoretical temperature rise value representing a temperature rise value of a fresh three-way catalyst from the start of resuming fuel / oil supply to the stop reverse-dragging working condition to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time is changed from a positive number to a non-positive number.

[0012] Optionally, the process of obtaining the theoretical temperature rise value comprises:

[0013] real-time obtaining the concentration of a preset gas in the gas at the input end of the to-be-tested three-way catalyst, the preset gas comprising at least one of CO, HC, NO x and O2;

[0014] inputting the concentration of the preset gas in the gas at the input end of the to-be-tested three-way catalyst into a fresh three-way catalyst temperature prediction model, outputting the temperature of the fresh three-way catalyst from the fresh three-way catalyst temperature prediction model, and obtaining the change relationship of the temperature of the fresh three-way catalyst with respect to time from the start of resuming fuel / oil supply to the stop reverse-dragging working condition; wherein the fresh three-way catalyst temperature prediction model is trained to predict the temperature of the fresh three-way catalyst by taking the concentration of the preset gas in the gas at the input end of the fresh three-way catalyst as a training sample.

[0015] calculating the derivative of the temperature of the fresh three-way catalyst with respect to time, and judging whether the derivative of the temperature of the fresh three-way catalyst with respect to time is changed from a positive number to a non-positive number, if yes, calculating a temperature rise value of the fresh three-way catalyst from the start of resuming fuel / oil supply to the stop reverse-dragging working condition to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time is changed from a positive number to a non-positive number, and recording the temperature rise value as the theoretical temperature rise value.

[0016] Optionally, the process of obtaining the theoretical temperature rise value comprises:

[0017] pre-testing the fresh three-way catalyst to obtain the theoretical temperature rise value;

[0018] The pre-testing the fresh three-way catalyst to obtain the theoretical temperature rise value comprises:

[0019] The temperature of the fresh three-way catalyst is obtained in real time from the start of resuming fuel / gas supply after the stop of the reverse drag working condition, and a relationship between the temperature of the fresh three-way catalyst and time is obtained.

[0020] The derivative of the temperature of the fresh three-way catalyst with respect to time is calculated, and it is determined whether the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number.

[0021] Optionally, the aging degree of the three-way catalyst under test is determined by comparing the actual temperature rise value and the theoretical temperature rise value, and the aging degree of the three-way catalyst under test includes:

[0022] It is determined whether the difference between the theoretical temperature rise value and the actual temperature rise value exceeds a first set threshold value, and if so, it is indicated that the three-way catalyst under test is aged.

[0023] Optionally, the aging degree of the three-way catalyst under test is determined by comparing the actual temperature rise value and the theoretical temperature rise value, and the aging degree of the three-way catalyst under test includes:

[0024] It is determined whether the ratio of the actual temperature rise value to the theoretical temperature rise value is lower than a second set threshold value, and if so, it is indicated that the three-way catalyst under test is aged.

[0025] Optionally, the aging detection method of the three-way catalyst further includes:

[0026] Based on the ratio of the actual temperature rise value to the theoretical temperature rise value, an aging coefficient of the three-way catalyst under test is obtained.

[0027] Based on the aging coefficient of the three-way catalyst under test and a corresponding relationship between the aging coefficient of the three-way catalyst obtained by prior testing and the modulation amplitude of the excess air coefficient of the three-way catalyst input end, the modulation amplitude of the excess air coefficient of the three-way catalyst input end is corrected, wherein the excess air coefficient of the three-way catalyst input end is the ratio of the actual air-fuel ratio of the three-way catalyst input end to the standard air-fuel ratio.

[0028] Optionally, the aging detection method of the three-way catalyst further includes:

[0029] Based on the ratio of the actual temperature rise value to the theoretical temperature rise value, an aging coefficient of the three-way catalyst under test is obtained.

[0030] The aging coefficient of the to-be-tested three-way catalyst and a corresponding relationship between the aging coefficient of the three-way catalyst and a set value of the excess air coefficient of the output end of the three-way catalyst obtained through pre-testing are used to correct the set value of the excess air coefficient of the output end of the to-be-tested three-way catalyst, wherein the excess air coefficient of the output end of the three-way catalyst is a ratio of an actual air-fuel ratio of the output end of the three-way catalyst to a standard air-fuel ratio.

[0031] An aging detection device of a three-way catalyst, comprising:

[0032] A control unit is configured to start timing from when the engine enters the reverse drag operating mode, determine whether the engine is in the reverse drag operating mode for more than a set time length, and control the engine to exit the reverse drag operating mode and start resuming fuel / oil / gas supply if the engine is in the reverse drag operating mode for more than the set time length.

[0033] An acquisition unit is configured to acquire the temperature of the to-be-tested three-way catalyst in real time from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply, and obtain a change relationship between the temperature of the to-be-tested three-way catalyst and time.

[0034] A calculation unit is configured to calculate a derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and determine whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number, and calculate a temperature rise value of the to-be-tested three-way catalyst from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply to when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from the positive number to the non-positive number, and record the temperature rise value as an actual temperature rise value if the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from the positive number to the non-positive number.

[0035] A comparison unit is configured to compare the actual temperature rise value and a theoretical temperature rise value, and determine the aging degree of the to-be-tested three-way catalyst, wherein the theoretical temperature rise value represents a temperature rise value of a fresh three-way catalyst from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply to when a derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number.

[0036] An aging detection device of a three-way catalyst, comprising a memory and a processor;

[0037] The memory is configured to store a program.

[0038] The processor is configured to execute the program to implement each step of the aging detection method of the three-way catalyst according to any one of the above.

[0039] A storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement each step of the aging detection method of the three-way catalyst according to any one of the above.

[0040] Compared with the prior art, the above technical solution has the following advantages:

[0041] The aging detection method of the three-way catalyst provided by the embodiments of the present application first starts timing from when the engine enters the motoring condition. Since the engine stops injecting oil / gas after entering the motoring condition, i.e., the engine does not combust to do work, fresh air flows directly into the to-be-detected three-way catalyst through the cylinder, the oxygen content in the to-be-detected three-way catalyst gradually increases, and then it is determined whether the time length during which the engine is in the motoring condition exceeds a set time length. If yes, it is considered that the to-be-detected three-way catalyst has been filled with oxygen, and the engine is controlled to exit the motoring condition and start resuming fuel oil / gas supply. From the start of resuming fuel oil / gas supply after stopping the motoring condition, the gases emitted by the engine react with the oxygen in the to-be-detected three-way catalyst to increase the temperature of the to-be-detected three-way catalyst. The temperature of the to-be-detected three-way catalyst is acquired in real time to obtain the temperature change of the to-be-detected three-way catalyst with respect to time. The derivative of the temperature of the to-be-detected three-way catalyst with respect to time is calculated, and it is determined whether the derivative of the temperature of the to-be-detected three-way catalyst with respect to time changes from a positive number to a non-positive number. If yes, the temperature rise value of the to-be-detected three-way catalyst from the start of resuming fuel oil / gas supply after stopping the motoring condition to the time when the derivative of the temperature of the to-be-detected three-way catalyst with respect to time changes from a positive number to a non-positive number is calculated and recorded as an actual temperature rise value. It is known through experiments that the temperature rise values of the fresh three-way catalyst filled with oxygen and the aged three-way catalyst from the start of resuming fuel oil / gas supply after stopping the motoring condition to the time when the derivative of the temperature of the three-way catalyst with respect to time changes from a positive number to a non-positive number are obviously different. Therefore, by comparing the actual temperature rise value with a theoretical temperature rise value, the theoretical temperature rise value representing the temperature rise value of the fresh three-way catalyst from the start of resuming fuel oil / gas supply after stopping the motoring condition to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number, the aging degree of the to-be-detected three-way catalyst can be determined, which helps to replace the aged three-way catalyst in time and ensure the exhaust treatment effect of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0043] Figure 1 The flowchart of the aging detection method of the three-way catalyst provided by the embodiments of the present application;

[0044] Figure 2 The temperature change of the fresh three-way catalyst filled with oxygen with respect to time from the start of resuming fuel oil / gas supply after stopping the motoring condition;

[0045] Figure 3A schematic diagram of a temperature-time relationship of an aged three-way catalyst after oxygen storage and resuming fuel supply / gas supply from a stop deceleration condition;

[0046] Figure 4 A flowchart of another three-way catalyst aging detection method provided by the embodiments of the present application is shown in FIG. 4;

[0047] Figure 5 A structural diagram of a three-way catalyst aging detection device provided by the embodiments of the present application is shown in FIG. 5;

[0048] Figure 6 A structural diagram of another three-way catalyst aging detection device provided by the embodiments of the present application is shown in FIG. 6;

[0049] Figure 7 A hardware structural block diagram of an electronic device provided by the embodiments of the present application is shown in FIG. 7. DETAILED DESCRIPTION

[0050] 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. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0051] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details that are set forth in the following description, in other manners different from those described herein, and it can be apparent to those skilled in the art that the present application is not limited to the embodiments disclosed in the following description.

[0052] As described in the background section, how to detect the aging state of a three-way catalyst so as to replace the aged three-way catalyst in time has become a technical problem to be solved by those skilled in the art.

[0053] Currently, oxygen is actively filled into a three-way catalyst, and the maximum oxygen storage amount of the three-way catalyst is measured to diagnose the aging degree of the three-way catalyst. However, this active detection method adjusts the air-fuel ratio set value to be rich first and then lean (or lean first and then rich), which makes the exhaust gas deviate from the optimal emission window, thereby causing emission loss, and the method cannot be detected multiple times in a short period, and the diagnosis efficiency is low.

[0054] Therefore, the embodiments of the present application provide a three-way catalyst aging detection method, Figure 1 A flowchart of a three-way catalyst aging detection method provided by the embodiments of the present application is shown in FIG. 2; Figure 1As shown, the aging detection method of the three-way catalyst includes:

[0055] S100: Start timing from when the engine enters the reverse drag working condition, determine whether the time length of the engine in the reverse drag working condition exceeds the set time length, if yes, control the engine to exit the reverse drag working condition and start to restore fuel / oil gas supply.

[0056] It can be understood that the engine sprays fuel or gas in the normal working state, and the engine has a certain speed. The engine stops spraying fuel or gas at a certain speed, that is, enters the reverse drag working condition, at this time, the engine is driven by the wheels, and the engine does not burn to do work.

[0057] When starting to detect the aging of the to-be-tested three-way catalyst, the engine enters the reverse drag working condition, and timing is started from when the engine enters the reverse drag working condition. Since the engine stops spraying oil / gas after entering the reverse drag working condition, that is, the engine does not burn to do work, fresh air flows directly into the to-be-tested three-way catalyst through the cylinder, the oxygen content in the to-be-tested three-way catalyst gradually increases, and then it is determined whether the time length of the engine in the reverse drag working condition exceeds the set time length. If yes, it is considered that the to-be-tested three-way catalyst has been filled with oxygen, the engine is controlled to exit the reverse drag working condition, and the restoration of fuel / oil gas supply is started. The set time length can be set to ensure that the engine is in the reverse drag working condition for a period of time, and the to-be-tested three-way catalyst is filled with oxygen.

[0058] S110: Real-time acquisition of the temperature of the to-be-tested three-way catalyst is started from when the engine stops the reverse drag working condition and restores the fuel / oil gas supply, and the temperature change relationship of the to-be-tested three-way catalyst with respect to time is obtained.

[0059] It can be understood that the engine enters the normal working state from when the engine stops the reverse drag working condition and restores the fuel / oil gas supply, the temperature of the to-be-tested three-way catalyst increases due to the reaction of the exhaust gas of the engine and the oxygen in the to-be-tested three-way catalyst, and the temperature change relationship of the to-be-tested three-way catalyst with respect to time can be obtained by real-time acquisition of the temperature of the to-be-tested three-way catalyst. Specifically, the temperature of the to-be-tested three-way catalyst can be measured in real time by a temperature sensor, and then the temperature of the to-be-tested three-way catalyst can be obtained from the temperature sensor.

[0060] S120: Calculate the derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and determine whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, if yes, calculate the temperature rise value of the to-be-tested three-way catalyst from when the engine stops the reverse drag working condition and restores the fuel / oil gas supply to when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, and record it as the actual temperature rise value.

[0061] S130: comparing the actual temperature rising value and the theoretical temperature rising value, judging the aging degree of the to-be-tested three-way catalyst, the theoretical temperature rising value representing the temperature rising value of the fresh three-way catalyst when the derivative of the temperature about time changes from positive number to non-positive number from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition.

[0062] It is known through experiments that the temperature rising values of the fresh three-way catalyst and the aged three-way catalyst after being filled with oxygen are obviously different when the derivative of the temperature about time changes from positive number to non-positive number from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition.

[0063] Specifically, Figure 2 a schematic diagram showing the change relationship between the temperature and time of the fresh three-way catalyst after being filled with oxygen from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition is shown, Figure 3 a schematic diagram showing the change relationship between the temperature and time of the aged three-way catalyst after being filled with oxygen from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition is shown, wherein, Figure 2 and Figure 3 the three curves in the figure respectively correspond to the situations of different rotating speeds of the engine after resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition. From the figure, Figure 2 and Figure 3 it can be seen that, whether the three-way catalyst is fresh or aged, the temperature of the three-way catalyst increases first and then decreases, or increases first and then tends to be flat, with the increase of time from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition, wherein, the derivative of the temperature about time is positive number when the temperature increases with the increase of time, the derivative of the temperature about time is negative number when the temperature decreases with the increase of time, and the derivative of the temperature about time is 0 when the temperature tends to be flat with the increase of time, so that the inflection point of the temperature of the three-way catalyst about time corresponds to the time when the derivative of the temperature about time changes from positive number to non-positive number from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition. And, by comparing Figure 2 and Figure 3 it can be known that the temperature rising values of the fresh three-way catalyst and the aged three-way catalyst after being filled with oxygen are obviously different when the derivative of the temperature about time changes from positive number to non-positive number from the start of resuming fuel / oil supply to the fresh three-way catalyst after stopping the reverse-dragging working condition.

[0064] Based on the obtained temperature change relationship of the to-be-tested three-way catalyst with respect to time from the start of resuming fuel / oil gas supply in the stop reverse drag working condition, the derivative of the temperature of the to-be-tested three-way catalyst with respect to time is calculated, and it is judged whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive. If yes, the temperature rise value of the to-be-tested three-way catalyst from the start of resuming fuel / oil gas supply in the stop reverse drag working condition to the time when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive is calculated, which is recorded as the actual temperature rise value. Further, by comparing the actual temperature rise value and the theoretical temperature rise value, wherein the theoretical temperature rise value represents the temperature rise value of the fresh three-way catalyst from the start of resuming fuel / oil gas supply in the stop reverse drag working condition to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from positive to non-positive, the aging degree of the to-be-tested three-way catalyst can be judged, which is helpful for timely replacing the aged three-way catalyst and ensuring the tail gas treatment effect of the vehicle.

[0065] It can be understood that from the start of resuming fuel / oil gas supply in the stop reverse drag working condition, the derivative of the temperature of the to-be-tested three-way catalyst with respect to time can be calculated at the same time of acquiring the temperature of the to-be-tested three-way catalyst in real time, and it can be judged in real time whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive; or the temperature of the to-be-tested three-way catalyst in a period of time can be acquired, the temperature change relationship of the to-be-tested three-way catalyst with respect to time in the period of time is obtained, the derivative of the temperature of the to-be-tested three-way catalyst with respect to time is calculated, and it is judged whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, which is specific to the situation.

[0066] Optionally, as shown in Figure 1 the acquisition process of the theoretical temperature rise value includes:

[0067] S10: acquiring the concentration of preset gas in the gas at the input end of the to-be-tested three-way catalyst in real time, the preset gas including at least one of CO, HC, NO x and O2.

[0068] As known from the foregoing, the three-way catalyst converts CO, HC and NO x in the vehicle tail gas into harmless CO2, H2O and N2 through oxidation and reduction, the gas at the input end of the three-way catalyst includes CO, HC, NO x and O2, specifically, the concentration of preset gas in the gas at the input end of the to-be-tested three-way catalyst can be detected by an oxygen sensor at the input end of the three-way catalyst, and then the concentration of preset gas in the gas at the input end of the to-be-tested three-way catalyst is acquired from the oxygen sensor at the input end of the three-way catalyst, wherein the preset gas can be one, two, three or all of CO, HC, NO x and O2.

[0069] S11: input the concentration of the preset gas in the gas at the input end of the to-be-tested three-way catalyst into the fresh three-way catalyst temperature prediction model, output the temperature of the fresh three-way catalyst from the fresh three-way catalyst temperature prediction model, and obtain the change relationship of the temperature of the fresh three-way catalyst with respect to time from the start of resuming fuel / oil supply in the stop motoring condition.

[0070] In the embodiment, the fresh three-way catalyst temperature prediction model is used to replace the fresh three-way catalyst, and the temperature of the fresh three-way catalyst is predicted based on the concentration of the preset gas in the gas at the input end of the to-be-tested three-way catalyst after the same gas is input into the fresh three-way catalyst, and the change relationship of the temperature of the fresh three-way catalyst with respect to time from the start of resuming fuel / oil supply in the stop motoring condition is obtained. The fresh three-way catalyst temperature prediction model is trained by taking the concentration of the preset gas in the gas at the input end of the fresh three-way catalyst as the training sample and taking the temperature of the fresh three-way catalyst as the training target, so that the trained fresh three-way catalyst temperature prediction model can predict the temperature of the fresh three-way catalyst based on the concentration of the preset gas in the gas at the input end of the fresh three-way catalyst, and the error between the predicted temperature of the fresh three-way catalyst and the actual temperature of the fresh three-way catalyst is within the allowable range.

[0071] It should be noted that, when the fresh three-way catalyst temperature prediction model is trained, the concentration of the preset gas in the gas at the input end of the fresh three-way catalyst under various conditions is taken as the training sample, and when the engine is in the motoring condition, the engine does not combust to do work, so the gas at the input end of the three-way catalyst is mainly air, and when the engine resumes fuel / oil supply in the stop motoring condition, the gas at the input end of the three-way catalyst is tail gas emitted by the engine during normal combustion, and the engine speed and other conditions are different, so the tail gas emitted by the engine and input into the three-way catalyst is also different. Therefore, the fresh three-way catalyst temperature prediction model can be used to replace the fresh three-way catalyst, and the temperature of the fresh three-way catalyst can be predicted based on the concentration of the preset gas in the gas at the input end of the to-be-tested three-way catalyst after the same gas is input into the fresh three-way catalyst.

[0072] S12: calculate the derivative of the temperature of the fresh three-way catalyst with respect to time, and determine whether the derivative of the temperature of the fresh three-way catalyst with respect to time changes from positive to non-positive. If yes, calculate the temperature rise value of the fresh three-way catalyst from the start of resuming fuel / oil supply in the stop motoring condition to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from positive to non-positive, and take the temperature rise value as the theoretical temperature rise value.

[0073] Step S12 is similar to step S120. Starting from resuming fuel / oil gas supply from the stop of the motoring condition, the derivative of the fresh three-way catalyst temperature with respect to time can be calculated while predicting the fresh three-way catalyst temperature in real time based on the fresh three-way catalyst temperature prediction model, and it can be determined in real time whether the derivative of the fresh three-way catalyst temperature with respect to time changes from positive to non-positive; or the fresh three-way catalyst temperature over a period of time can be obtained, the change relationship of the fresh three-way catalyst temperature with respect to time over the period of time can be obtained, the derivative of the fresh three-way catalyst temperature with respect to time can be calculated, and it can be determined whether the derivative of the fresh three-way catalyst temperature with respect to time changes from positive to non-positive, which is determined according to the situation.

[0074] Alternatively, the process of obtaining the theoretical temperature rise value includes:

[0075] S20: Pre-test the fresh three-way catalyst to obtain the theoretical temperature rise value;

[0076] The pre-test of the fresh three-way catalyst to obtain the theoretical temperature rise value includes:

[0077] S21: Real-time obtain the fresh three-way catalyst temperature starting from resuming fuel / oil gas supply from the stop of the motoring condition, and obtain the change relationship of the fresh three-way catalyst temperature with respect to time;

[0078] S22: Calculate the derivative of the fresh three-way catalyst temperature with respect to time, and determine whether the derivative of the fresh three-way catalyst temperature with respect to time changes from positive to non-positive. If yes, calculate the fresh three-way catalyst temperature rise value starting from resuming fuel / oil gas supply from the stop of the motoring condition to the time when the derivative of the fresh three-way catalyst temperature with respect to time changes from positive to non-positive, and take it as the theoretical temperature rise value.

[0079] It can be understood that the fresh three-way catalyst temperature rise value starting from resuming fuel / oil gas supply from the stop of the motoring condition to the time when the derivative of the fresh three-way catalyst temperature with respect to time changes from positive to non-positive is basically unchanged, so a plurality of fresh three-way catalysts can be pre-tested, and a theoretical temperature rise value can be obtained for each fresh three-way catalyst, so that a plurality of theoretical temperature rise values can be obtained, and the average of the plurality of theoretical temperature rise values is taken as the theoretical temperature rise value, thereby reducing the test error and improving the test precision.

[0080] It can also be understood that, when testing each fresh state three-way catalyst, the fresh state catalyst is first filled with oxygen, specifically, the engine can be controlled to be in the motoring condition for more than a certain time, and then the fresh state three-way catalyst is considered to be filled with oxygen. Then, the fresh state three-way catalyst is tested to obtain the theoretical temperature rise value.

[0081] Optionally, in step S130, comparing the actual temperature rise value with the theoretical temperature rise value to determine the aging degree of the three-way catalyst can include:

[0082] S131: determining whether the difference between the theoretical temperature rise value and the actual temperature rise value exceeds a first set threshold value, if yes, indicating that the three-way catalyst under test is aged.

[0083] It can be known from Figure 2 and Figure 3 that, as the three-way catalyst gradually ages, the actual temperature rise value becomes smaller and smaller, and the difference (T1-T2) between the theoretical temperature rise value T1 and the actual temperature rise value T2 becomes larger and larger. Therefore, if the difference (T1-T2) between the theoretical temperature rise value T1 and the actual temperature rise value T2 exceeds the first set threshold value, it indicates that the three-way catalyst under test is aged, and if it does not exceed the first set threshold value, it indicates that the three-way catalyst under test is not aged.

[0084] Optionally, in step S130, comparing the actual temperature rise value with the theoretical temperature rise value to determine the aging degree of the three-way catalyst can include:

[0085] S132: determining whether the ratio of the actual temperature rise value to the theoretical temperature rise value is lower than a second set threshold value, if yes, indicating that the three-way catalyst under test is aged.

[0086] It can be known from Figure 2 and Figure 3 that, as the three-way catalyst gradually ages, the actual temperature rise value becomes smaller and smaller, and the ratio (T2 / T1) of the actual temperature rise value T2 to the theoretical temperature rise value T1 becomes smaller and smaller. Therefore, if the ratio (T2 / T1) of the actual temperature rise value T2 to the theoretical temperature rise value T1 is lower than the second set threshold value, it indicates that the three-way catalyst under test is aged, and if it is not lower than the second set threshold value, it indicates that the three-way catalyst under test is not aged.

[0087] Based on any of the above embodiments, optionally, as shown in Figure 4 , the aging detection method of the three-way catalyst can further include:

[0088] S140: obtaining an aging coefficient of the three-way catalyst under test based on the ratio of the actual temperature rise value to the theoretical temperature rise value.

[0089] Since the actual temperature rise value is smaller and smaller as the three-way catalyst ages, the ratio of the actual temperature rise value T2 to the theoretical temperature rise value T1 (T2 / T1) is smaller and smaller, and therefore, the aging coefficient of the three-way catalyst to be tested can be represented by the ratio of the actual temperature rise value T2 to the theoretical temperature rise value T1 (T2 / T1), that is, the aging degree of the three-way catalyst to be tested.

[0090] S150: correcting the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst to be tested based on the corresponding relationship between the aging coefficient of the three-way catalyst to be tested and the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst obtained by the pre-test, wherein the excess air coefficient of the input end of the three-way catalyst is the ratio of the actual air-fuel ratio of the input end of the three-way catalyst to the standard air-fuel ratio.

[0091] The air-fuel ratio refers to the mass ratio between air and fuel in the mixed gas, and the standard air-fuel ratio represents the air-fuel ratio of complete combustion. For an engine using fuel oil as fuel, the standard air-fuel ratio is 14.7, that is, the ideal mass ratio of air to fuel oil is 14.7:1; for an engine using fuel gas as fuel, the standard air-fuel ratio is 16.7, that is, the ideal mass ratio of air to fuel gas is 16.7:1. If the actual air-fuel ratio is less than the standard air-fuel ratio, it means that the amount of air in the mixed gas is relatively small and the amount of fuel is relatively large, which is a rich mixture; if the actual air-fuel ratio is greater than the standard air-fuel ratio, it means that the amount of air in the mixed gas is relatively large and the amount of fuel is relatively small, which is a lean mixture. In practical applications, the actual air-fuel ratio of the engine fluctuates within a certain amplitude range of the standard air-fuel ratio.

[0092] The excess air coefficient lambda is the ratio of the actual air-fuel ratio to the standard air-fuel ratio, which is used to evaluate the amount of air in the mixed gas. Generally, an initial lambda value and an initial lambda modulation amplitude are set when the engine is shipped, so that the lambda is maintained within a relatively small fluctuation range. However, in the case of aging of the three-way catalyst, if the initial lambda value and the initial lambda modulation amplitude are continued to be used, since the conversion efficiency of the three-way catalyst is reduced at this time, more oxygen enters the three-way catalyst, which may cause oxygen breakthrough of the three-way catalyst. To prevent oxygen breakthrough of the three-way catalyst, in this embodiment, the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst to be tested is corrected based on the corresponding relationship between the aging coefficient of the three-way catalyst to be tested and the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst obtained by the pre-test, so as to adapt to the emission requirements of the aged three-way catalyst under different working conditions.

[0093] Similarly, as shown in Figure 4 illustrated, the aging detection method of the three-way catalyst can further comprise:

[0094] S160: obtaining the aging coefficient of the to-be-tested three-way catalyst based on the ratio of the actual temperature rise value and the theoretical temperature rise value.

[0095] Steps S140 and S160 are performed synchronously.

[0096] S170: correcting the set value of the excess air coefficient of the output end of the to-be-tested three-way catalyst based on the corresponding relationship between the aging coefficient of the to-be-tested three-way catalyst and the set value of the aging coefficient of the three-way catalyst and the excess air coefficient of the output end of the three-way catalyst obtained through the pre-test; wherein the excess air coefficient of the output end of the three-way catalyst is the ratio of the actual air-fuel ratio of the output end of the three-way catalyst to the standard air-fuel ratio.

[0097] Since the set value of the excess air coefficient lambda of the output end of the three-way catalyst is controlled by the closed loop of the switch oxygen sensor of the output end of the three-way catalyst, in step S170, the set value of the excess air coefficient lambda of the output end of the to-be-tested three-way catalyst is corrected based on the aging coefficient of the to-be-tested three-way catalyst, so that the influence of the aging of the three-way catalyst on the closed loop control of the switch oxygen sensor of the output end of the three-way catalyst can be corrected.

[0098] In the above two embodiments, when the to-be-tested three-way catalyst is aging, the modulation amplitude of the excess air coefficient of the input end of the to-be-tested three-way catalyst and the set value of the excess air coefficient of the output end of the to-be-tested three-way catalyst are actively adjusted based on the corresponding relationship between the aging coefficient of the to-be-tested three-way catalyst, the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst and the set value of the aging coefficient of the three-way catalyst and the corresponding relationship between the aging coefficient of the three-way catalyst and the set value of the excess air coefficient of the output end of the three-way catalyst obtained through the pre-test, so that the influence of the aging of the three-way catalyst on the emission pollutants can be reduced, and the emission consistency of the three-way catalyst can be ensured.

[0099] Therefore, compared with the prior art method of adjusting the set value of the air-fuel ratio first and then detecting, the aging state detection method of the three-way catalyst provided in the embodiments of the present application does not need to adjust the air-fuel ratio in advance, does not cause the emission to be random, and can be detected multiple times in a short period of time, and has high detection accuracy. Moreover, after the aging coefficient of the three-way catalyst is detected, the modulation amplitude of the lambda of the input end of the three-way catalyst and the set value of the lambda of the output end of the three-way catalyst can be corrected based on the aging coefficient of the three-way catalyst, so that the influence of the aging of the three-way catalyst on the emission pollutants can be reduced, and the emission consistency of the three-way catalyst can be ensured.

[0100] The embodiments of the present application also provide a three-way catalyst aging detection device, as shown in Figure 5 The three-way catalyst aging detection device comprises:

[0101] The control unit 100 is configured to start timing from when the engine enters the reverse drag working condition, determine whether the time length that the engine is in the reverse drag working condition exceeds a set time length, and control the engine to exit the reverse drag working condition and start resuming fuel / oil gas supply if yes.

[0102] The acquisition unit 110 is configured to acquire the temperature of the to-be-tested three-way catalyst in real time from when the resumption of fuel / oil gas supply after stopping the reverse drag working condition starts, and obtain the temperature change of the to-be-tested three-way catalyst with respect to time.

[0103] The calculation unit 120 is configured to calculate the derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and determine whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number, and calculate the temperature rise value of the to-be-tested three-way catalyst from when the resumption of fuel / oil gas supply after stopping the reverse drag working condition starts to when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number, and record the value as an actual temperature rise value if yes.

[0104] The comparison unit 130 is configured to compare the actual temperature rise value and a theoretical temperature rise value, and determine the aging degree of the to-be-tested three-way catalyst, the theoretical temperature rise value representing the temperature rise value of a fresh three-way catalyst from when the resumption of fuel / oil gas supply after stopping the reverse drag working condition starts to when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number.

[0105] Specifically, the comparison unit 130 can determine whether the difference between the theoretical temperature rise value and the actual temperature rise value exceeds a first set threshold value, and indicate that the to-be-tested three-way catalyst is aged if yes; or can determine whether the ratio of the actual temperature rise value to the theoretical temperature rise value is lower than a second set threshold value, and indicate that the to-be-tested three-way catalyst is aged if yes.

[0106] Based on the above embodiments, optionally, as shown in Figure 6 The three-way catalyst aging detection device can further include:

[0107] The first adjustment unit 140 is configured to obtain an aging coefficient of the to-be-tested three-way catalyst based on the ratio of the actual temperature rise value to the theoretical temperature rise value, and correct the modulation amplitude of the excess air coefficient of the input end of the to-be-tested three-way catalyst based on the corresponding relationship between the aging coefficient of the to-be-tested three-way catalyst and the modulation amplitude of the excess air coefficient of the input end of the three-way catalyst obtained by pre-test; wherein the excess air coefficient of the input end of the three-way catalyst is the ratio of the actual air-fuel ratio of the input end of the three-way catalyst to the standard air-fuel ratio.

[0108] Based on any of the above embodiments, optionally, as shown in Figure 6 The three-way catalyst aging detection device can further include:

[0109] The second adjusting unit 150 is configured to obtain an aging coefficient of the to-be-tested three-way catalyst based on a ratio of the actual temperature rise value and the theoretical temperature rise value, and correct a set value of the excess air coefficient of the output end of the to-be-tested three-way catalyst based on a corresponding relationship between the aging coefficient of the to-be-tested three-way catalyst and the aging coefficient of the three-way catalyst and the set value of the excess air coefficient of the output end of the three-way catalyst obtained through the pre-test; the excess air coefficient of the output end of the three-way catalyst is a ratio of the actual air-fuel ratio of the output end of the three-way catalyst and the standard air-fuel ratio.

[0110] Since the aging detection device of the three-way catalyst corresponds to the aging detection method of the three-way catalyst, and the steps of the aging detection method of the three-way catalyst provided by the embodiment of the application have been described in detail, the steps will not be described in detail here.

[0111] The embodiment of the application further provides an electronic device, which can be a server, a PC, a PAD, a mobile phone, an ECU (Electronic Control Unit), a VCU (Vehicle Control Unit), an MCU (Micro Controller Unit), an HCU (Hybrid Control Unit), etc.

[0112] Optionally, Figure 7 A hardware structure block diagram of the electronic device is shown in FIG. 1. Figure 7 As shown in FIG. 1, the electronic device can include at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4.

[0113] In the embodiment of the application, the number of the processor 1, the communication interface 2, the memory 3 and the communication bus 4 is at least one, and the processor 1, the communication interface 2 and the memory 3 complete the communication with each other through the communication bus 4.

[0114] The processor 1 can be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiment of the application, etc.

[0115] The memory 3 can include a high-speed RAM memory, and can also include a non-volatile memory, such as at least one disk memory.

[0116] The memory stores a program, and the processor can call the program stored in the memory, and the program is used to:

[0117] Timing from the engine entering the reverse drag working condition, judging whether the time length of the engine in the reverse drag working condition exceeds the set time length, if yes, controlling the engine to exit the reverse drag working condition and starting to restore the fuel / oil gas supply;

[0118] From the start of stopping the reverse drag working condition and restoring the fuel / oil gas supply, obtaining the temperature of the to-be-tested three-way catalyst in real time, and obtaining the change relation of the temperature of the to-be-tested three-way catalyst with respect to time;

[0119] Calculating the derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and judging whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, if yes, calculating the temperature rise value of the to-be-tested three-way catalyst from the start of stopping the reverse drag working condition and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, and recording the actual temperature rise value;

[0120] Comparing the actual temperature rise value and the theoretical temperature rise value, judging the aging degree of the to-be-tested three-way catalyst, and the theoretical temperature rise value represents the temperature rise value of the fresh three-way catalyst from the start of stopping the reverse drag working condition and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from positive to non-positive.

[0121] The refinement function and the expansion function of the program can refer to the description above, and will not be described here.

[0122] The embodiment of the application further provides a storage medium, which can store a program suitable for processor execution, and the program is used for:

[0123] Timing from the engine entering the reverse drag working condition, judging whether the time length of the engine in the reverse drag working condition exceeds the set time length, if yes, controlling the engine to exit the reverse drag working condition and starting to restore the fuel / oil gas supply;

[0124] From the start of stopping the reverse drag working condition and restoring the fuel / oil gas supply, obtaining the temperature of the to-be-tested three-way catalyst in real time, and obtaining the change relation of the temperature of the to-be-tested three-way catalyst with respect to time;

[0125] Calculating the derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and judging whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, if yes, calculating the temperature rise value of the to-be-tested three-way catalyst from the start of stopping the reverse drag working condition and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from positive to non-positive, and recording the actual temperature rise value;

[0126] The actual temperature rise value is compared with a theoretical temperature rise value, and the aging degree of the to-be-tested three-way catalyst is judged, the theoretical temperature rise value representing the temperature rise value of the fresh three-way catalyst when the derivative of the temperature of the fresh three-way catalyst about time changes from a positive number to a non-positive number from the start of resuming fuel / oil supply to the temperature of the fresh three-way catalyst.

[0127] The refinement function and the expansion function of the program can refer to the above description, and will not be described here.

[0128] The various parts in the specification are described in a combination of parallel and progressive manners, and each part mainly describes the difference from other parts, and the same and similar parts between the various parts can be referred to each other.

[0129] The above description of the disclosed embodiments, the features recorded in each embodiment in the specification can be replaced or combined with each other, so that the person skilled in the art can realize or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of detecting aging of a three-way catalyst, characterized by, The method comprises the following steps: Timing is started from the engine entering the reverse drag state, and it is determined whether the engine is in the reverse drag state for more than a set time length, and if so, the engine is controlled to exit the reverse drag state and start to restore fuel / oil gas supply; The temperature of the to-be-tested three-way catalyst is obtained in real time from the start of stopping the reverse drag state and restoring the fuel / oil gas supply, and the temperature change of the to-be-tested three-way catalyst with respect to time is obtained; The derivative of the temperature of the to-be-tested three-way catalyst with respect to time is calculated, and it is determined whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number, and if so, the temperature rise value of the to-be-tested three-way catalyst from the start of stopping the reverse drag state and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number is calculated, and is recorded as an actual temperature rise value; The actual temperature rise value and a theoretical temperature rise value are compared, and the aging degree of the to-be-tested three-way catalyst is determined, wherein the theoretical temperature rise value represents the temperature rise value of a fresh three-way catalyst from the start of stopping the reverse drag state and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number; The process of obtaining the theoretical temperature rise value comprises the following steps: Real-time acquisition of the concentration of preset gases in the gas at the input end of the three-way catalyst to be measured, the preset gases including at least one of CO, HC, NO and O2 x ​ The concentration of the preset gas in the gas at the input end of the to-be-tested three-way catalyst is input into a fresh three-way catalyst temperature prediction model, and the temperature of the fresh three-way catalyst is output from the fresh three-way catalyst temperature prediction model, so as to obtain the temperature change of the fresh three-way catalyst with respect to time from the start of stopping the reverse drag state and restoring the fuel / oil gas supply; wherein the fresh three-way catalyst temperature prediction model is trained by taking the concentration of the preset gas in the gas at the input end of the fresh three-way catalyst as a training sample and predicting the temperature of the fresh three-way catalyst as a training target; The derivative of the temperature of the fresh three-way catalyst with respect to time is calculated, and it is determined whether the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number, and if so, the temperature rise value of the fresh three-way catalyst from the start of stopping the reverse drag state and restoring the fuel / oil gas supply to the time when the derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number is calculated, and is recorded as the theoretical temperature rise value; The comparison of the actual temperature rise value and the theoretical temperature rise value to determine the aging degree of the to-be-tested three-way catalyst comprises the following steps: It is determined whether the difference between the theoretical temperature rise value and the actual temperature rise value exceeds a first set threshold, and if so, it is indicated that the to-be-tested three-way catalyst is aged; or it is determined whether the ratio of the actual temperature rise value to the theoretical temperature rise value is lower than a second set threshold, and if so, it is indicated that the to-be-tested three-way catalyst is aged.

2. The deterioration detection method of a three-way catalyst according to claim 1, characterized by, The aging detection method of the three-way catalyst further comprises the following steps: Based on the ratio of the actual temperature rise value to the theoretical temperature rise value, an aging coefficient of the to-be-tested three-way catalyst is obtained. The aging coefficient of the to-be-tested three-way catalyst and a corresponding relationship between the aging coefficient of the three-way catalyst obtained through pre-testing and a modulation amplitude of an excess air coefficient of an input end of the three-way catalyst are used to correct the modulation amplitude of the excess air coefficient of the input end of the to-be-tested three-way catalyst, wherein the excess air coefficient of the input end of the three-way catalyst is a ratio of an actual air-fuel ratio of the input end of the three-way catalyst to a standard air-fuel ratio.

3. The method of detecting deterioration of a three-way catalyst according to claim 1, characterized by, The aging detection method of the three-way catalyst further includes: An aging coefficient of the to-be-tested three-way catalyst is obtained based on a ratio of the actual temperature rise value to the theoretical temperature rise value; The aging coefficient of the to-be-tested three-way catalyst and a corresponding relationship between the aging coefficient of the three-way catalyst obtained through pre-testing and a set value of an excess air coefficient of an output end of the three-way catalyst are used to correct the set value of the excess air coefficient of the output end of the to-be-tested three-way catalyst, wherein the excess air coefficient of the output end of the three-way catalyst is a ratio of an actual air-fuel ratio of the output end of the three-way catalyst to a standard air-fuel ratio.

4. An aging detection device for a three-way catalyst for performing the method according to any one of claims 1 to 3, characterized in that The aging detection device of the three-way catalyst includes: A control unit is configured to start timing from when the engine enters the reverse drag operating mode, determine whether the engine is in the reverse drag operating mode for more than a set time length, and control the engine to exit the reverse drag operating mode and start resuming fuel / oil / gas supply if the engine is in the reverse drag operating mode for more than the set time length. An acquisition unit is configured to acquire the temperature of the to-be-tested three-way catalyst in real time from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply, and obtain a change relationship of the temperature of the to-be-tested three-way catalyst with respect to time. A calculation unit is configured to calculate a derivative of the temperature of the to-be-tested three-way catalyst with respect to time, and determine whether the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from a positive number to a non-positive number, and calculate a temperature rise value of the to-be-tested three-way catalyst from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply to when the derivative of the temperature of the to-be-tested three-way catalyst with respect to time changes from the positive number to the non-positive number, and record the temperature rise value as an actual temperature rise value. A comparison unit is configured to compare the actual temperature rise value with a theoretical temperature rise value, and determine the aging degree of the to-be-tested three-way catalyst, wherein the theoretical temperature rise value represents a temperature rise value of a fresh three-way catalyst from when the engine stops the reverse drag operating mode and resumes fuel / oil / gas supply to when a derivative of the temperature of the fresh three-way catalyst with respect to time changes from a positive number to a non-positive number.

5. An aging detection device for a three-way catalytic converter, characterized in that, The aging detection device of the three-way catalyst includes a memory and a processor. The memory is configured to store a program. The processor is configured to execute the program to implement each step of the aging detection method of the three-way catalyst according to any one of claims 1-3.

6. A storage medium having stored thereon a computer program, characterized in that The computer program, when executed by the processor, implements each step of the aging detection method of the three-way catalyst according to any one of claims 1-3.

Images