Method, device, electronic device and storage medium for identifying removal of three-way catalytic converter

Abstract

The present application provides a method, apparatus, electronic device, and storage medium for removing and identifying a three-way catalytic converter, which obtain the operating conditions parameters including the post-oxygen voltage data of a target vehicle in the current driving cycle; determine whether the current driving cycle meets the first operating condition, where the first operating condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition; if the current driving cycle meets the first operating condition, increment the value of the first number of the driving cycle that meets the first operating condition by one, and perform a derivative process on the post-oxygen voltage data corresponding to the current driving cycle; if the derivative value of the post-oxygen voltage has the characteristics of a mother and son double peak, increment the value of the second number of the derivative value of the post-oxygen voltage having the characteristics of a mother and son double peak by one; if the first number is greater than the first number threshold and the second number is less than the second number threshold, determine that the three-way catalytic converter of the target vehicle has been removed. Through the above solution, it is possible to accurately identify whether the three-way catalytic converter in the target vehicle has been removed.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and specifically to a method, device, electronic device, and storage medium for identifying the removal of a three-way catalytic converter. Background Art

[0002] When a vehicle is running, the vehicle exhaust gas will contain harmful gases such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons. Directly discharging the vehicle exhaust gas into the atmosphere will pollute the environment. Therefore, it is necessary to use a three-way catalytic converter to convert the vehicle exhaust gas into harmless gas through oxidation-reduction and then discharge it into the atmosphere.

[0003] Since the three-way catalytic converter contains a large amount of precious metals and its replacement cost is relatively high, most users will remove the three-way catalytic converter in the vehicle in order to reduce costs.

[0004] In the related art, the removal of the three-way catalytic converter in the vehicle is mainly identified by installing a corresponding post-oxygen sensor on the exhaust pipe after the three-way catalytic converter. Specifically, the post-oxygen sensor can detect the oxygen concentration in the exhaust gas. Since the three-way catalytic converter has an oxygen storage function, when the three-way catalytic converter is removed, the post-oxygen sensor can detect this change. That is to say, the post-oxygen sensor can identify whether the three-way sensor in the vehicle is removed by detecting the oxygen concentration in the exhaust pipe. In this regard, after the user removes the three-way sensor, a bottom screw is usually installed at the bottom of the post-oxygen sensor to raise the post-oxygen sensor, so that the post-oxygen sensor cannot accurately obtain the oxygen concentration in the exhaust pipe, and thus the accurate identification of whether the three-way catalytic converter is removed cannot be achieved. Summary of the Invention

[0005] The embodiments of the present application provide a method, device, electronic device, and storage medium for identifying the removal of a three-way catalytic converter, and accurately identify whether the three-way catalytic converter in the vehicle is removed by determining whether the characteristic of a mother-daughter double peak appears in the derivative value of the post-oxygen voltage corresponding to the vehicle when it enters the reverse towing condition and then exits the reverse towing condition.

[0006] In view of this, in the first aspect of the embodiments of the present application, a method for identifying the removal of a three-way catalytic converter is provided, and the method includes:

[0007] Obtain the working condition parameters of the target vehicle in the current driving cycle, where the working condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle;

[0008] According to the working condition parameters, determine whether the current driving cycle meets the first working condition, where the first working condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition, and the reverse towing condition refers to the condition where the engine of the target vehicle is driven by external power to operate;

[0009] If the current driving cycle meets the first operating condition, increment the first count value of the driving cycles that meet the first operating condition by one, and perform a derivative operation on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding post-oxygen voltage derivative value;

[0010] If the post-oxygen voltage derivative value has a mother-child double-peak feature, increment the second count value of the times when the post-oxygen voltage derivative value has the mother-child double-peak feature by one, where the mother-child double-peak feature means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak;

[0011] If the first count is greater than the first count threshold and the second count is less than the second count threshold, determine that the three-way catalytic converter of the target vehicle has been removed.

[0012] A second aspect of the embodiments of the present application provides a device for identifying the removal of a three-way catalytic converter, the device includes:

[0013] An acquisition unit, configured to acquire the operating parameters of a target vehicle in the current driving cycle, where the operating parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle;

[0014] A judgment unit, configured to judge whether the current driving cycle meets the first operating condition according to the operating parameters, where the first operating condition includes that the target vehicle enters the reverse drag condition and then exits the reverse drag condition, and the reverse drag condition means that the engine of the target vehicle is driven by external power to operate;

[0015] A first counting unit, configured to increment the first count value of the driving cycles that meet the first operating condition by one when the current driving cycle meets the first operating condition, and perform a derivative operation on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding post-oxygen voltage derivative value;

[0016] A second counting unit, configured to increment the second count value of the times when the post-oxygen voltage derivative value has a mother-child double-peak feature by one when the post-oxygen voltage derivative value has a mother-child double-peak feature, where the mother-child double-peak feature means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak;

[0017] A determination unit, configured to determine that the three-way catalytic converter of the target vehicle has been removed when the first count is greater than the first count threshold and the second count is less than the second count threshold.

[0018] A third aspect of the embodiments of the present application provides an electronic device, including:

[0019] A memory, configured to store executable instructions;

[0020] A processor, when executing the executable instructions stored in the memory, implements the method for identifying the removal of a three-way catalytic converter provided in the embodiments of the present application.

[0021] A fourth aspect of the embodiments of the present application provides a computer-readable medium storing executable instructions, which, when executed by a processor, implement the method for identifying the removal of a three-way catalytic converter provided in the embodiments of the present application.

[0022] It can be seen from the above technical solutions that the operating condition parameters of the target vehicle in the current driving cycle are obtained, and the operating condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle; according to the operating condition parameters, it is determined whether the current driving cycle meets the first operating condition, and the first operating condition includes that the target vehicle enters the reverse drag condition and then exits the reverse drag condition, and the reverse drag condition refers to the condition where the engine of the target vehicle is driven by external power; if the current driving cycle meets the first operating condition, the value of the first number of the driving cycles that meet the first operating condition is incremented by one, so as to count the driving cycles that meet the first operating condition of the target vehicle in the current period, and the derivative of the post-oxygen voltage data corresponding to the current driving cycle is processed to obtain the corresponding post-oxygen voltage derivative value; if the post-oxygen voltage derivative value has a mother-son double-peak characteristic, the value of the second number of the post-oxygen voltage derivative values with the mother-son double-peak characteristic is incremented by one, and the mother-son double-peak characteristic means that there are two peaks in the post-oxygen voltage derivative value and the value of the first peak is less than the value of the second peak; if the first number is greater than the first number threshold and the second number is less than the second number threshold, it is determined that the three-way catalytic converter of the target vehicle has been removed. The reason for the determination is that the first number being greater than the first number threshold indicates that a certain number of operating condition parameters under the first operating condition of the target vehicle have been collected, and the second number being less than the second number threshold indicates that the number of times the post-oxygen voltage derivative value shows a mother-son double-peak when the fuel supply is restored after the reverse drag condition of the target vehicle has not reached the second number threshold. Since the post-oxygen voltage derivative value will only show the mother-son double-peak characteristic when the three-way catalytic converter of the vehicle is not removed, that is, when the three-way catalytic converter is removed, the post-oxygen voltage derivative value will not show the mother-son double-peak characteristic. Therefore, when the first number is greater than the first number threshold and the second number is less than the second number threshold, it indicates that the three-way catalytic converter of the target vehicle has been removed. Through the above technical solutions, it is possible to accurately identify whether the three-way catalytic converter in the target vehicle has been removed. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0024] Figure 1The flowchart of a method for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application;

[0025] Figure 2 The graph of the post-oxygen voltage value of a normal part provided by an embodiment of the present application;

[0026] Figure 3 The graph of the post-oxygen voltage value of a removed part provided by an embodiment of the present application;

[0027] Figure 4 The graph of the derivative value of the post-oxygen voltage of a normal part provided by an embodiment of the present application;

[0028] Figure 5 The specific flowchart of a method for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application;

[0029] Figure 6 The schematic diagram of a device for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0031] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] In the related art, the removal of the three-way catalytic converter in a vehicle is mainly identified by installing a corresponding post-oxygen sensor on the exhaust pipe after the three-way catalytic converter. However, after the user removes the three-way catalytic converter in the vehicle, in order to avoid being detected by the post-oxygen sensor, a bottom screw is added to the bottom of the post-oxygen sensor to raise the post-oxygen sensor, so that the post-oxygen sensor cannot accurately obtain the oxygen concentration in the exhaust pipe, and thus the accurate identification of whether the three-way catalytic converter has been removed cannot be achieved. When there is no three-way catalytic converter in the vehicle, it will cause the exhaust gas discharged from the engine to directly enter the atmosphere, causing environmental pollution.

[0033] In view of this, the embodiments of the present application provide a method, device, electronic device and storage medium for identifying the removal of a three-way catalytic converter, and accurately identify whether the three-way catalytic converter in the vehicle has been removed by checking whether the characteristic of a mother-daughter double peak appears in the derivative value of the post-oxygen voltage corresponding to the vehicle when entering and then exiting the engine braking condition.

[0034] The method for identifying the removal of a three-way catalytic converter provided by the embodiments of the present application can be implemented by a computer device, which can be a terminal device or a server. Among them, the server can be an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. Terminal devices include, but are not limited to, mobile phones, computers, intelligent voice interaction devices, smart home appliances, vehicle-mounted terminals, aircraft, etc. The terminal device and the server can be directly or indirectly connected through wired or wireless communication methods, and the present application does not limit this.

[0035] Figure 1 FIG. 10 is a flowchart of a method for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application. This method can be executed by a computer device. In this embodiment, taking the computer device as a terminal device as an example for illustration, this method includes:

[0036] S101, obtain the working condition parameters of the target vehicle in the current driving cycle, where the working condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle.

[0037] The target vehicle refers to the vehicle whose three-way catalytic converter needs to be detected and identified for removal. In order to accurately identify the three-way catalytic converter in the target vehicle, the working condition parameters of the target vehicle can be obtained, and the public parameters include the post-oxygen voltage data.

[0038] The post-oxygen voltage data refers to the post-oxygen voltage value in the exhaust gas detected by the post-oxygen sensor. It should be noted that in the embodiment, the position of the post-oxygen sensor is not limited, that is, the post-oxygen sensor can be normally placed in the vehicle exhaust pipe, or can be placed after being raised by the user with a bottom screw.

[0039] S102. Determine whether the current driving cycle meets the first operating condition according to the operating condition parameters. The first operating condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition. The reverse towing condition refers to the condition where the engine of the target vehicle is driven by external power to operate.

[0040] The reverse towing condition refers to the condition where the vehicle is driven by external power to operate the engine when the engine is not working. For example, when the vehicle is on a long downhill road condition (without stepping on the accelerator), it is a typical reverse towing condition.

[0041] Whether the current driving cycle in this embodiment meets the first operating condition means whether the target vehicle enters the reverse towing condition and then exits the reverse towing condition. As Figure 2 shown, when the vehicle enters the reverse towing condition, the engine does not work, and the gas in the exhaust pipe of the vehicle is air. At this time, the post-oxygen voltage value will be close to zero. When the vehicle exits the reverse towing condition, the engine will resume working, and the post-oxygen voltage will rise accordingly and return to the level before the reverse towing condition. Therefore, it can be determined whether the current driving cycle meets the first operating condition according to the operating condition parameters including the post-oxygen voltage data. For example, when the post-oxygen voltage value of the target vehicle first drops to zero and then rises to the previous value, it can be determined that the current driving cycle of the target vehicle meets the first operating condition.

[0042] In a possible implementation manner, the first operating condition further includes:

[0043] The entry duration of the target vehicle entering the reverse towing condition is greater than a preset entry duration threshold, and the post-oxygen voltage value corresponding to when the target vehicle exits the reverse towing condition is less than a preset post-oxygen voltage threshold.

[0044] Since the derivative of the post-oxygen voltage value corresponding to meeting the first operating condition needs to be calculated in subsequent steps and the derivative value of the post-oxygen voltage is analyzed, in order to ensure the reliability of the analysis result, on the basis that the first operating condition already includes that the target vehicle first enters the reverse towing condition and then exits the reverse towing condition, it can further include that the entry duration of the target vehicle entering the reverse towing condition is greater than a preset entry duration threshold to ensure that the time for the target vehicle to enter the reverse towing condition exceeds a certain value before analyzing its corresponding post-oxygen voltage value, and the post-oxygen voltage value corresponding to when the target vehicle exits the reverse towing condition is less than a preset post-oxygen voltage threshold to ensure that the post-oxygen voltage value has dropped below a certain value before analyzing its corresponding post-oxygen voltage value when the vehicle exits the reverse towing condition.

[0045] In addition to ensuring the duration of the target vehicle entering the reverse towing condition, in a possible implementation manner, the first operating condition further includes:

[0046] The catalytic converter temperature of the target vehicle is within the preset catalytic converter temperature range, the intake air temperature of the target vehicle is within the preset intake air temperature range, the engine speed of the target vehicle is within the preset engine speed range, the running duration of the current driving cycle is greater than the preset cycle threshold, and the intake air charge after the target vehicle exits the reverse drag condition is greater than the preset intake air charge.

[0047] To ensure the reliability of the acquired data, it is necessary to ensure that the target vehicle is operating stably when acquiring the data. For this, it can be ensured that the catalytic converter temperature of the target vehicle is within the preset catalytic converter temperature range to keep the catalytic converter temperature within the temperature range corresponding to the normal operation of the engine, the intake air temperature of the target vehicle is within the preset intake air temperature range to keep the intake air temperature within the intake air temperature range corresponding to the normal operation of the engine, the engine speed of the target vehicle is within the preset engine speed range to keep the engine speed within the speed range corresponding to the normal operation of the engine, the running duration of the current driving cycle is greater than the preset cycle threshold to ensure that the engine has been operating normally for a certain period of time, and the intake air charge after the target vehicle exits the reverse drag condition is greater than the preset intake air charge to ensure that the intake air charge when the target vehicle resumes fuel supply is greater than a certain value.

[0048] S103. If the current driving cycle meets the first working condition, increment the value of the first count for the driving cycle that meets the first working condition by one, and perform a derivative operation on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding post-oxygen voltage derivative value.

[0049] To count the driving cycles that meet the first working condition, if the current driving cycle meets the first working condition, increment the value of the first count by one. The first count refers to the number of times the target vehicle meets the first working condition.

[0050] If the current driving cycle meets the first working condition, to further analyze the post-oxygen voltage data corresponding to the current driving cycle, a derivative operation can be performed on the post-oxygen voltage data to obtain the post-oxygen voltage derivative value corresponding to meeting the first working condition.

[0051] S104. If the post-oxygen voltage derivative value has a mother-son double-peak feature, increment the value of the second count for the post-oxygen voltage derivative value with the mother-son double-peak feature by one. The mother-son double-peak feature means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak.

[0052] In this embodiment, it will be analyzed whether the post-oxygen voltage derivative value corresponding to the driving cycle that meets the first working condition has a mother-son double-peak feature. The mother-son double-peak feature can be used to analyze whether the three-way catalytic converter in the vehicle has been removed.

[0053] The principle of judging whether the three-way catalytic converter in a vehicle has been removed based on the presence or absence of a mother-daughter double peak in the derivative value of the post-oxygen voltage is as follows: Since the three-way catalytic converter converts harmful gases in the vehicle exhaust into harmless gases through oxidation-reduction reactions, the three-way catalytic converter has a certain oxygen storage capacity. For example, the cerium-based material in the three-way catalytic converter can be used for oxygen storage, as Figure 2 shown. When the engine is dragged backwards and fuel supply is restored, the post-oxygen voltage value will rise from zero. Among them, due to the oxygen storage capacity of the three-way catalytic converter, the excess reduced reducing agents (such as carbon monoxide, hydrocarbons, and hydrogen) in the vehicle exhaust will first consume the oxygen stored in the catalytic converter. During this process, the post-oxygen voltage value will first rise slightly. When the oxygen in the three-way catalytic converter is consumed, the post-oxygen voltage value will rise rapidly. That is to say, when the three-way catalytic converter in the vehicle has not been removed, there will be an obvious "step" in the change of the post-oxygen voltage value; when the three-way catalytic converter in the vehicle has been removed, as Figure 3 shown, since there is no three-way catalytic converter with oxygen storage capacity, even if a bottom screw is installed at the bottom of the post-oxygen sensor to raise it, although the raised screw with appropriate porosity and height can flexibly adjust the delay of the change of the post-oxygen voltage value. For example, different delays in the change of the post-oxygen voltage value will be caused by different heights and pore diameters of the raised screw, but since there is no three-way catalytic converter with oxygen storage capacity in the vehicle at this time, when the engine is dragged backwards and fuel supply is restored, there will be no Figure 2 "step" shown in Figure 2 . Therefore, in order to accurately judge whether there is a Figure 4 "step" caused by the three-way catalytic converter shown in

[0054] in the post-oxygen voltage value, the derivative of the post-oxygen voltage value is calculated to obtain the corresponding derivative value of the post-oxygen voltage. As

[0055] Figure 4 shown, when there is a three-way catalytic converter in the vehicle, a mother-daughter double peak feature will appear in the post-oxygen voltage value. The mother-daughter double peak will include a lower daughter peak and a higher mother peak. Among them, the lower daughter peak is caused by the oxygen storage capacity of the three-way catalytic converter. When the three-way catalytic converter in the vehicle has been removed, there will only be one peak in the post-oxygen voltage value, and the mother-daughter double peak feature will not appear. Therefore, if there is a mother-daughter double peak feature in the derivative value of the post-oxygen voltage, the value of the second count can be incremented by one. The second count refers to the number of times that the derivative value of the post-oxygen voltage of the target vehicle has a mother-daughter double peak feature. Among them, the larger the value of the second count, the more times the mother-daughter double peak appears in the derivative value of the post-oxygen voltage of the target vehicle.

[0055] To ensure the reliability of the second count, corresponding credibility verification can be performed. When the derivative value of the post-oxygen voltage has a characteristic of double peaks (parent and child), in one possible implementation, in the current driving cycle, if in the post-oxygen voltage data corresponding to the target vehicle exiting the engine braking condition, the duration of the post-oxygen voltage value drop is greater than a preset drop duration threshold or the dropped value of the post-oxygen voltage data is greater than a preset dropped value threshold, determine that the corresponding derivative value of the post-oxygen voltage is unreliable data and do not increment the value of the second count by one.

[0056] Specifically, in the current driving cycle, if in the post-oxygen voltage data corresponding to the target vehicle exiting the engine braking condition, the duration of the post-oxygen voltage value drop is greater than the preset drop duration threshold, it indicates that during the process of the target vehicle exiting the engine braking condition and resuming fuel supply, there is a phenomenon that the post-oxygen voltage value drops for more than a certain duration. As Figure 2 shown, normally when the vehicle resumes fuel supply, the post-oxygen voltage value will not drop for a long time. Therefore, the post-oxygen voltage value dropping for more than a certain duration indicates that the post-oxygen voltage data corresponding to the current driving cycle is unreliable, that is, the corresponding derivative value of the post-oxygen voltage is unreliable data. At this time, there is no need to increment the value of the second count by one. Among them, the drop duration of the post-oxygen voltage data can be obtained by timing the time of the post-oxygen voltage drop during the process of resuming fuel supply.

[0057] Correspondingly, in the current driving cycle, if in the post-oxygen voltage data corresponding to the target vehicle exiting the engine braking condition, the dropped value of the post-oxygen voltage data is greater than the preset dropped value threshold, it indicates that during the process of the target vehicle exiting the engine braking condition and resuming fuel supply, there is a phenomenon that the dropped value of the post-oxygen voltage value exceeds a certain value. As Figure 2 shown, normally when the vehicle resumes fuel supply, the post-oxygen voltage value will not drop significantly. Therefore, the post-oxygen voltage value dropping by a certain value indicates that the post-oxygen voltage data corresponding to the current driving cycle is unreliable, that is, the corresponding derivative value of the post-oxygen voltage is unreliable data. At this time, there is no need to increment the value of the second count by one. Among them, the dropped value of the post-oxygen voltage data can be obtained by taking the difference between the value of the post-oxygen voltage several steps before and the current value during the process of resuming fuel supply.

[0058] S105. If the first count is greater than the first count threshold and the second count is less than the second count threshold, determine that the three-way catalytic converter of the target vehicle has been removed.

[0059] As described above, the first number refers to the number of times the target vehicle meets the first operating condition, and the second number refers to the number of times the derivative value of the post-oxygen voltage of the target vehicle has the characteristic of a mother-child double peak. The first number threshold is used to measure the number of derivative values of the post-oxygen voltage obtained before determining the identification result of the three-way catalytic converter. The larger the value of the first number threshold, the more derivative values of the post-oxygen voltage are obtained before determining the identification result, and the more reliable the corresponding identification result is. However, if the value of the first number threshold is too large, it will undoubtedly increase the calculation amount. Therefore, relevant identification personnel can set the first number threshold according to their needs. For example, the first number threshold can be set to 10. The second number threshold is used to measure the number of mother-child double peaks that appear among the multiple derivative values of the post-oxygen voltage obtained when the first number has met the first number threshold condition. The closer the second number threshold is to the first number threshold, the higher the probability that mother-child double peaks appear among the multiple derivative values of the post-oxygen voltage obtained. Therefore, the corresponding second number threshold can be set according to the first number threshold. For example, when the first number threshold is set to 10, the second number threshold can be set to 8. When the first number is greater than the first number threshold, it means that the target vehicle has met the first operating condition multiple times, and the derivative processing of the post-oxygen voltage value under the condition of meeting the first operating condition has been performed multiple times. When the second number is less than the second number threshold, it means that the mother-child double peak characteristic does not appear multiple times in the derivative values of the post-oxygen voltage of the target vehicle. When the first number is greater than the first number threshold and the second number is less than the second number threshold, it means that the mother-child double peak characteristic does not appear multiple times in the post-oxygen voltage values obtained on the basis of the target vehicle performing the derivative processing of the post-oxygen voltage value under the condition of meeting the first operating condition multiple times. Since the mother-child double peak characteristic appears only when the three-way catalytic converter of the target vehicle has not been removed, it can be determined that the three-way catalytic converter of the target vehicle has been removed.

[0060] In a possible implementation manner, the method for identifying the removal of the three-way catalytic converter further includes:

[0061] If the first number is greater than the first number threshold and the second number is greater than or equal to the second number threshold, it is determined that the three-way catalytic converter of the target vehicle has not been removed, and the first number is set to zero and the second number is set to zero.

[0062] As described above, the first number refers to the number of times the target vehicle meets the first operating condition, and the second number refers to the number of times the derivative value of the post-oxygen voltage of the target vehicle has the characteristic of a mother-child double peak. The first number threshold is used to measure the number of derivative values of the post-oxygen voltage obtained before determining the identification result of the three-way catalytic converter, and the second number threshold is used to measure the number of mother-child double peaks that appear among the multiple derivative values of the post-oxygen voltage obtained when the first number has met the first number threshold condition. When the first number is greater than the first number threshold, it indicates that the target vehicle has met the first operating condition multiple times and has performed derivative processing on the post-oxygen voltage values under the first operating condition multiple times. When the second number is greater than the second number threshold, it indicates that the derivative values of the post-oxygen voltage of the target vehicle have the mother-child double peak characteristic multiple times. When the first number is greater than the first number threshold and the second number is greater than the second number threshold, it indicates that the derivative values of the post-oxygen voltage obtained by the target vehicle after performing derivative processing on the post-oxygen voltage values under the first operating condition multiple times have the mother-child double peak characteristic multiple times. Since the mother-child double peak characteristic only appears when the three-way catalytic converter of the target vehicle has not been removed, it can be determined that the three-way catalytic converter of the target vehicle has not been removed.

[0063] In addition, when it is determined that the three-way catalytic converter of the target vehicle has not been removed, in order to continue to detect whether the three-way catalytic converter of the target vehicle has been removed, the first number and the second number can be both set to zero so that the first number and the second number can be re-counted.

[0064] In summary, obtain the operating condition parameters of the target vehicle in the current driving cycle, where the operating condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle; according to the operating condition parameters, determine whether the current driving cycle meets the first operating condition, where the first operating condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition, and the reverse towing condition refers to the condition where the engine of the target vehicle is driven by external power; if the current driving cycle meets the first operating condition, increment the value of the first count for the driving cycles that meet the first operating condition, so as to count the driving cycles that meet the first operating condition of the target vehicle in the current period, and perform a derivative process on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding post-oxygen voltage derivative value; if the post-oxygen voltage derivative value has the characteristic of a mother-daughter double peak, increment the value of the second count for the post-oxygen voltage derivative value with the mother-daughter double peak characteristic, where the mother-daughter double peak characteristic means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak; if the first count is greater than the first count threshold and the second count is less than the second count threshold, determine that the three-way catalytic converter of the target vehicle has been removed. The reason is that the first count being greater than the first count threshold indicates that a certain number of operating condition parameters under the first operating condition of the target vehicle have been collected, and the second count being less than the second count threshold indicates that the number of times the post-oxygen voltage derivative value shows a mother-daughter double peak when the target vehicle resumes fuel supply after the reverse towing condition ends has not reached the second count threshold. Since the post-oxygen voltage derivative value will only show the characteristic of a mother-daughter double peak when the three-way catalytic converter of the vehicle is not removed, that is, when the three-way catalytic converter is removed, the post-oxygen voltage derivative value will not show the characteristic of a mother-daughter double peak. Therefore, when the first count is greater than the first count threshold and the second count is less than the second count threshold, it indicates that the three-way catalytic converter of the target vehicle has been removed.

[0065] Figure 5 FIG. is a specific flowchart of a method for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application. The method includes:

[0066] Collect the post-oxygen voltage signal and analyze the operating condition of the target vehicle through the post-oxygen voltage signal;

[0067] Determine whether the target vehicle meets the first operating condition, where the first operating condition includes that the vehicle enters and exits the reverse towing condition, the time of entering the reverse towing condition exceeds a certain value, the post-oxygen voltage is lower than a certain value at the end of the reverse towing, the catalytic converter temperature is within a certain range, the intake air temperature is within a certain range, the engine speed is within a certain range, the current driving cycle runs for more than a certain time, and the intake charge at the time of resuming fuel supply is greater than a certain value and passes the anti-shake confirmation;

[0068] Derive the post-oxygen voltage corresponding to the first operating condition to obtain the corresponding derivative value of the post-oxygen voltage, and increment the value of the first count M representing the number of times the target vehicle satisfies the first operating condition by one; for the post-oxygen voltage that does not satisfy the first operating condition, no derivative processing is performed, and the target vehicle continues to collect the post-oxygen voltage signal;

[0069] Determine whether the "parent-child double peak" feature appears in the derivative value of the post-oxygen voltage and whether it passes the credibility judgment. Among them, the credibility judgment conditions may include:

[0070] During the end of the engine coast-down and the resumption of fuel supply, time the time for the post-oxygen voltage to drop. If it exceeds a certain value, it is considered that this diagnosis is not credible;

[0071] During the end of the engine coast-down and the resumption of fuel supply, subtract the value several steps before the current value of the post-oxygen voltage from the current value. If it exceeds a certain value, it is considered that this diagnosis is not credible;

[0072] If the "parent-child double peak" appears in the derivative value of the post-oxygen voltage and passes the credibility judgment, increment the value of the second count N representing the "parent-child double peak" feature by one;

[0073] Respectively count the first count M for effective judgment and the second count N for judging the appearance of the parent-child double peak. When M is greater than the first count threshold Mmax and N is greater than the second count threshold Nlim, it indicates that the three-way catalytic converter in the vehicle has not been removed and the fault is cured. Reset M and N, and the vehicle continues to collect the post-oxygen voltage information; when M is greater than the first count threshold Mmax and N is not greater than the second count threshold Nlim, it is determined that the three-way catalytic converter of the vehicle has been removed, and the fault is reported and the diagnosis ends.

[0074] Figure 6 This is a schematic diagram of a device for identifying the removal of a three-way catalytic converter provided by an embodiment of the present application. The device includes:

[0075] An acquisition unit 601, configured to acquire the operating condition parameters of the target vehicle in the current driving cycle, where the operating condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle;

[0076] A judgment unit 602, configured to judge whether the current driving cycle satisfies the first operating condition according to the operating condition parameters. The first operating condition includes that the target vehicle enters the engine coast-down condition and then exits the engine coast-down condition. The engine coast-down condition refers to the condition where the engine of the target vehicle is driven by external power;

[0077] A first counting unit 603, configured to increment the value of the first count of the driving cycles that satisfy the first operating condition by one when the current driving cycle satisfies the first operating condition, and perform derivative processing on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding derivative value of the post-oxygen voltage;

[0078] A second counting unit 604, configured to increment the numerical value of the second time when the derivative value of the post-oxygen voltage has a mother-child double-peak feature, where the mother-child double-peak feature means that the derivative value of the post-oxygen voltage has two peaks and the numerical value of the first peak is less than the numerical value of the second peak;

[0079] A determination unit 605, configured to determine that the three-way catalytic converter of the target vehicle has been removed when the first count is greater than the first count threshold and the second count is less than the second count threshold.

[0080] In a possible implementation manner, the first operating condition further includes:

[0081] The entry duration for the target vehicle to enter the engine braking condition is greater than a preset entry duration threshold, and the post-oxygen voltage value corresponding to when the target vehicle exits the engine braking condition is less than a preset post-oxygen voltage threshold.

[0082] In a possible implementation manner, the first operating condition further includes:

[0083] The catalytic converter temperature of the target vehicle is within a preset catalytic converter temperature range, the intake air temperature of the target vehicle is within a preset intake air temperature range, the engine speed of the target vehicle is within a preset engine speed range, the running duration of the current driving cycle is greater than a preset cycle threshold, and the intake air charge of the target vehicle after exiting the engine braking condition is greater than a preset intake air charge.

[0084] In a possible implementation manner, the second counting unit 604 is further configured to:

[0085] When the derivative value of the post-oxygen voltage has a mother-child double-peak feature, in the current driving cycle, if there is a post-oxygen voltage value drop duration greater than a preset drop duration threshold or a post-oxygen voltage data drop value greater than a preset drop value threshold in the post-oxygen voltage data corresponding to when the target vehicle exits the engine braking condition, determine that the corresponding derivative value of the post-oxygen voltage is unreliable data and do not increment the numerical value of the second time.

[0086] In a possible implementation manner, the determination unit 605 is further configured to:

[0087] When the first count is greater than the first count threshold and the second count is greater than or equal to the second count threshold, determine that the three-way catalytic converter of the target vehicle has not been removed, and set the first count to zero and set the second count to zero.

[0088] It should be noted that the specific working processes of the various modules provided in the above embodiments of the present application can be correspondingly referred to the corresponding implementation manners in the above method embodiments, and will not be elaborated herein.

[0089] Another embodiment of the present application provides an electronic device, including:

[0090] A memory for storing executable instructions;

[0091] A processor, when executing the executable instructions stored in the memory, implements the method in the above-mentioned method embodiments of the present application.

[0092] Another embodiment of the present application provides a computer-readable storage medium storing executable instructions, which are used to implement the method in the above-mentioned method embodiments of the present application when being executed by a processor.

[0093] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Skilled professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious 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 rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for identifying the removal of a three-way catalytic converter, characterized in that, The method includes: Obtaining the operating condition parameters of the target vehicle in the current driving cycle, where the operating condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle; Judging whether the current driving cycle meets the first operating condition according to the operating condition parameters, where the first operating condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition, and the reverse towing condition refers to the condition where the engine of the target vehicle is driven by external power; If the current driving cycle meets the first operating condition, increment the numerical value of the first number of the driving cycles that meet the first operating condition by one, and perform a derivative process on the post-oxygen voltage data corresponding to the current driving cycle to obtain the corresponding post-oxygen voltage derivative value; If the post-oxygen voltage derivative value has a mother-child double-peak feature, increment the numerical value of the second number of the post-oxygen voltage derivative values with the mother-child double-peak feature by one, where the mother-child double-peak feature means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak; If the first number is greater than the first number threshold and the second number is less than the second number threshold, determine that the three-way catalytic converter of the target vehicle has been removed.

2. The method according to claim 1, wherein The first operating condition further includes: The entry duration of the target vehicle entering the reverse towing condition is greater than a preset entry duration threshold, and the post-oxygen voltage value corresponding to the target vehicle exiting the reverse towing condition is less than a preset post-oxygen voltage threshold.

3. The method according to claim 2, wherein The first operating condition further includes: The catalytic converter temperature of the target vehicle is within a preset catalytic converter temperature range, the intake air temperature of the target vehicle is within a preset intake air temperature range, the engine speed of the target vehicle is within a preset engine speed range, the operating duration of the current driving cycle is greater than a preset cycle threshold, and the intake charge of the target vehicle after exiting the reverse towing condition is greater than a preset intake charge.

4. The method according to claim 1, characterized in that, When the post-oxygen voltage derivative value has a mother-child double-peak feature, the method further includes: In the current driving cycle, if the post-oxygen voltage data corresponding to the target vehicle exiting the reverse towing condition has a post-oxygen voltage value drop duration greater than a preset drop duration threshold or the post-oxygen voltage data drop value is greater than a preset drop value threshold, determine that the corresponding post-oxygen voltage derivative value is unreliable data and do not increment the numerical value of the second number by one.

5. The method according to claim 1, characterized in that, The method further includes: If the first number is greater than the first number threshold and the second number is greater than or equal to the second number threshold, determine that the three-way catalytic converter of the target vehicle has not been removed, and set the first number to zero and set the second number to zero.

6. A removal recognition device for a three-way catalytic converter, characterized in that, The device includes: An acquisition unit for acquiring the operating condition parameters of the target vehicle in the current driving cycle, where the operating condition parameters include the post-oxygen voltage data of the exhaust pipe of the target vehicle; A judgment unit for judging whether the current driving cycle meets the first operating condition according to the operating condition parameters, where the first operating condition includes that the target vehicle enters the reverse towing condition and then exits the reverse towing condition, and the reverse towing condition refers to the condition where the engine of the target vehicle is driven by external power; A first counting unit, configured to increment a first count value of a driving cycle that meets the first operating condition by one when the current driving cycle meets the first operating condition, and perform a derivative process on the post-oxygen voltage data corresponding to the current driving cycle to obtain a corresponding post-oxygen voltage derivative value; A second counting unit, configured to increment a second count value of the post-oxygen voltage derivative value having the mother-child double-peak feature by one when the post-oxygen voltage derivative value has the mother-child double-peak feature, where the mother-child double-peak feature means that the post-oxygen voltage derivative value has two peaks and the value of the first peak is less than the value of the second peak; A determination unit, configured to determine that the three-way catalytic converter of the target vehicle has been removed when the first count is greater than a first count threshold and the second count is less than a second count threshold.

7. The device according to claim 6, wherein The first operating condition further includes: The entry duration of the target vehicle entering the engine braking condition is greater than a preset entry duration threshold, and the post-oxygen voltage value corresponding to the target vehicle exiting the engine braking condition is less than a preset post-oxygen voltage threshold.

8. The device according to claim 6, characterized in that, The first operating condition further includes: The catalytic converter temperature of the target vehicle is within a preset catalytic converter temperature range, the intake air temperature of the target vehicle is within a preset intake air temperature range, the engine speed of the target vehicle is within a preset engine speed range, the running duration of the current driving cycle is greater than a preset cycle threshold, and the intake air charge of the target vehicle after exiting the engine braking condition is greater than a preset intake air charge.

9. An electronic device, characterized in that, Comprising: A memory, configured to store executable instructions; A processor, configured to implement the method for identifying the removal of the three-way catalytic converter according to any one of claims 1 to 5 when executing the executable instructions stored in the memory.

10. A computer-readable storage medium, characterized in that, Stored with executable instructions, configured to implement the method for identifying the removal of the three-way catalytic converter according to any one of claims 1 to 5 when being executed by a processor.

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