Method for detecting ammonia leakage of three-way catalyst, related device and electronic equipment

Abstract

The application provides a method for detecting ammonia leakage of a three-way catalyst, related devices and electronic equipment. The method comprises: obtaining oxygen concentration data in a window, wherein the vehicle is in a steady state condition, and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value; determining whether the time proportion of the oxygen concentration data being less than a first threshold value in the window is greater than a second threshold value, and whether the oxygen concentration distribution is less than a third threshold value; determining that the three-way catalyst has ammonia leakage when the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value; and determining that the three-way catalyst does not have ammonia leakage when the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value. The application solves the problem that ammonia leakage in the three-way catalyst cannot be accurately identified in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia leakage monitoring, in particular to a method and device for detecting ammonia leakage of a three-way catalyst, a computer readable storage medium, a computer program product and an electronic device. BACKGROUND

[0002] Currently, the detection of ammonia leakage in a three-way catalyst in an exhaust treatment system of a vehicle mainly relies on some traditional sensors, but the accuracy of the traditional sensors is limited, and it is difficult to accurately identify the ammonia leakage in the three-way catalyst. SUMMARY

[0003] The main purpose of the present application is to provide a method and device for detecting ammonia leakage of a three-way catalyst, a computer readable storage medium, a computer program product and an electronic device, to at least solve the problem that it is difficult to accurately identify ammonia leakage in a three-way catalyst in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for detecting ammonia leakage of a three-way catalyst is provided, the three-way catalyst is located in a vehicle, and the method comprises: a step of obtaining, under the condition that the vehicle is in a steady state condition and the oxygen concentration data detected by a nitrogen oxide sensor is greater than a preset value, obtaining the time proportion of the oxygen concentration data being less than a first threshold value and the oxygen concentration distribution in a window, the window being a preset time period or a time period required for an engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being the oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window; a first determination step of determining whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determination step of determining that ammonia leakage occurs in the three-way catalyst under the condition that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value; and determining that ammonia leakage does not occur in the three-way catalyst under the condition that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0005] Optionally, the method further comprises: in the case that it is determined that the three-way catalyst does not leak ammonia, obtaining the number of windows in which no ammonia leakage occurs, different windows corresponding to the same operating condition of the vehicle; in the case that the number of windows in which no ammonia leakage occurs is greater than or equal to a fourth threshold value, adjusting the air-fuel ratio set value of the engine in the vehicle so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio set value; and determining at least whether the three-way catalyst leaks ammonia according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value.

[0006] Optionally, determining at least whether the three-way catalyst leaks ammonia according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determination step of determining that the three-way catalyst leaks ammonia in the case that the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, and determining that the three-way catalyst does not leak ammonia in the case that the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value; an adjustment step of continuing to adjust the air-fuel ratio set value so that, in the case that it is determined that the three-way catalyst leaks ammonia, the direction of the current adjustment of the air-fuel ratio set value is the same as the direction of the last adjustment, and, in the case that it is determined that the three-way catalyst does not leak ammonia, the direction of the current adjustment is opposite to the direction of the last adjustment; and a first loop step of cyclically executing the third determination step and the adjustment step for a predetermined number of times.

[0007] Optionally, in the case that it is determined that the three-way catalyst does not leak ammonia, obtaining the number of windows in which no ammonia leakage occurs comprises: a counting step of increasing a counting value by 1 in the case that it is determined that the three-way catalyst does not leak ammonia; and a second loop step of cyclically executing the obtaining step, the first determination step, the second determination step, and the counting step to obtain the number of windows in which no ammonia leakage occurs.

[0008] Optionally, adjusting the air-fuel ratio set value of the engine in the vehicle comprises: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0009] Optionally, before the acquiring step, the method further comprises: acquiring a steady state determining parameter, the steady state determining parameter comprising at least part of the following: a rotation speed of the engine, a rotation speed change rate, an intake charge of the engine, an intake charge change rate, a water temperature of the engine, a temperature of the three-way catalyst, a mass flow of exhaust gas in the exhaust pipe, an operating state of the nitrogen oxide sensor, and an operating state of the vehicle; and determining that the vehicle is in the steady state working condition when the steady state determining parameter meets a preset condition, the preset condition comprising at least part of the following: the rotation speed being within a first preset range, the rotation speed change rate being within a second preset range, the intake charge being within a third preset range, the intake charge change rate being within a fourth preset range, the water temperature being within a fifth preset range, the temperature being within a sixth preset range, the mass flow being within a seventh preset range, the nitrogen oxide sensor being in a normal operating state, and the vehicle being in a normal operating state.

[0010] According to another aspect of the present application, there is provided a device for detecting ammonia leakage of a three-way catalyst, the three-way catalyst being located in a vehicle, the device comprising: a first acquiring unit configured to acquire, in a case where the vehicle is in a steady state working condition and an oxygen concentration data detected by a nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution within a window, the window being a preset time period or a time period required for an engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data within the window; a first determining unit configured to determine, in a first determining step, whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; and a second determining unit configured to determine, in a second determining step, that the three-way catalyst has ammonia leakage in a case where the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determine that the three-way catalyst has no ammonia leakage in a case where the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0011] According to still another aspect of the present application, there is provided a computer readable storage medium comprising a stored program, wherein the program, when executed, controls a device in which the computer readable storage medium is located to perform any of the methods.

[0012] According to yet another aspect of the present application, there is provided a computer program product comprising computer instructions which, when executed by a processor, implement any of the methods.

[0013] According to another aspect of the present application, an electronic device is provided, comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise instructions for performing any of the methods described above.

[0014] According to the technical solution of the present application, firstly, in the case that the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion of the oxygen concentration data being less than a first threshold value and the oxygen concentration distribution in a window are obtained, then it is determined whether the time proportion is greater than a second threshold value and the oxygen concentration distribution is less than a third threshold value, in the case that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that the three-way catalyst has ammonia leakage, and in the case that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that the three-way catalyst does not have ammonia leakage. According to the oxygen concentration data measured by the nitrogen oxide sensor in a window and the oxygen concentration distribution, the present application determines whether the three-way catalyst has ammonia leakage, and achieves the effect of accurately identifying whether the three-way catalyst has ammonia leakage. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are presented by way of example or for purpose of explanation only. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a three-way catalyst ammonia leakage detection method according to an embodiment of the present application is shown;

[0017] Figure 2 A flowchart of a three-way catalyst ammonia leakage detection method according to an embodiment of the present application is shown;

[0018] Figure 3 A flowchart of a three-way catalyst ammonia leakage detection method according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of a three-way catalyst ammonia leakage detection device according to an embodiment of the present application is shown.

[0020] Among the above drawings, the following reference signs are included:

[0021] 102, processor; 104, memory; 106, transmission device; 108, input / output device. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] In order for those skilled in the technical field to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] As introduced in the background, the conventional sensor in the prior art is difficult to accurately identify the ammonia leakage in the three-way catalyst. To solve the above technical problems, the embodiments of the present application provide a three-way catalyst ammonia leakage detection method, a detection device, a computer readable storage medium, a computer program product and an electronic device.

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0027] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking the case of running on a mobile terminal, Figure 1 is a hardware structure block diagram of a mobile terminal of a three-way catalyst ammonia leakage detection method of the embodiments of the present application. As Figure 1 shown, the mobile terminal can include one or more Figure 1The mobile terminal can further include a transmission device 106 for communication function and an input / output device 108. Those skilled in the art can understand that, Figure 1 The structure shown is only schematic and does not limit the structure of the mobile terminal. For example, the mobile terminal can include more or less components than shown, or have different configurations of the components shown. Figure 1 The mobile terminal can include more or less components than shown, or have different configurations of the components shown. Figure 1 The mobile terminal can include more or less components than shown, or have different configurations of the components shown.

[0028] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the method for detecting ammonia leakage of a three-way catalyst according to the embodiments of the present application. The processor 102 can execute various functional applications and data processing by running the computer programs stored in the memory 104, i.e., implement the method. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0029] In the present embodiment, a method for detecting ammonia leakage of a three-way catalyst running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0030] Figure 2 is a flowchart of the method for detecting ammonia leakage of a three-way catalyst according to the embodiments of the present application. As Figure 2 shown, the method includes the following steps:

[0031] In the case that the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window;

[0032] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxide and ammonia, and cannot effectively distinguish whether the reading value is nitrogen oxide or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and the oxygen signal measured by the nitrogen oxide sensor can directly determine the current emission type, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completing a preset work means that the engine normally works according to the design requirements, reaches a predetermined output power and efficiency, and thus promotes the vehicle to run.

[0033] In the case that the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window;

[0034] In the case that the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window;

[0035] According to the embodiment, in the case that the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window are acquired, then it is determined whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value, in the case that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that the three-way catalyst leaks ammonia, and in the case that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that the three-way catalyst does not leak ammonia. According to the oxygen concentration data and the oxygen concentration distribution measured by the nitrogen oxide sensor in a window, it is determined whether the three-way catalyst leaks ammonia, and the effect of accurately identifying whether the three-way catalyst leaks ammonia is achieved.

[0036] In an alternative, the method further comprises:

[0037] In step S204, in a case where it is determined that the three-way catalyst does not leak ammonia, the number of windows in which ammonia does not leak is obtained, and different windows correspond to the same operating condition of the vehicle;

[0038] Specifically, the same operating condition means that the vehicle is in a steady state condition, and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value.

[0039] In step S205, in a case where the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, the air-fuel ratio set value of the engine in the vehicle is adjusted so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and the oxygen concentration data after adjusting the air-fuel ratio set value is obtained.

[0040] In step S206, according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value, it is determined whether the three-way catalyst leaks ammonia.

[0041] In the embodiment, in a case where it is confirmed that the three-way catalyst does not leak ammonia, the number of windows in which ammonia does not leak under the same operating condition is accumulated, and when this number reaches or exceeds a preset threshold value, there may be problems such as aging of the three-way catalyst, which causes the oxygen concentration data detected by the nitrogen oxide sensor to fluctuate greatly, thereby interfering with the ammonia leakage judgment. At this time, in order to further ensure the accuracy of ammonia leakage monitoring, the air-fuel ratio set value of the engine of the vehicle is adjusted to increase, and then the oxygen concentration data before and after adjusting the air-fuel ratio set value is compared. The comparison result is used as a basis for further determining whether the three-way catalyst leaks ammonia. By dynamically adjusting the air-fuel ratio and observing the change of the oxygen concentration, the accuracy and sensitivity of ammonia leakage identification are further improved.

[0042] Specifically, in order to meet the technical route of "stoichiometric ratio + three-way catalyst" of natural gas engine, it is necessary to control the air-fuel ratio in a small window, so that nitrogen oxides, methane, carbon monoxide and ammonia can be converted with high efficiency. When the air-fuel ratio is low and deviates from the emission window, the oxygen concentration will continue to decrease, resulting in ammonia leakage. When the three-way catalyst is seriously aged, the oxygen storage capacity will decrease significantly, which may cause the oxygen concentration measured by the nitrogen oxide sensor to fluctuate greatly, and the limit conditions of steps S201, S202 and S203 cannot be met, at this time, the air-fuel ratio set value needs to be actively adjusted, and whether ammonia leakage occurs is judged according to the change of the adjusted oxygen concentration data. The equivalence ratio refers to the molar ratio of catalyst to substrate, and in the three-way catalyst, it usually refers to the molar ratio of nitrogen oxides and carbon monoxide. The selection of equivalence ratio has an important influence on the effect of catalytic reaction, and the best equivalence ratio usually needs to be determined according to the specific reaction conditions and the characteristics of the catalyst.

[0043] In some other example embodiments, according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value, at least determining whether the three-way catalyst leaks ammonia includes: a third determination step, in the case that the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst leaks ammonia, and in the case that the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst does not leak ammonia; an adjustment step, continuing to adjust the air-fuel ratio set value, so that in the case that the three-way catalyst leaks ammonia, the adjustment direction of the air-fuel ratio set value this time is the same as the adjustment direction of the last time, and in the case that the three-way catalyst does not leak ammonia, the adjustment direction this time is opposite to the adjustment direction of the last time; a first circulation step, circulating the third determination step and the adjustment step for a predetermined number of times.

[0044] In the example embodiments, first, by comparing the oxygen concentration data before and after adjusting the air-fuel ratio set value, it can be determined whether the three-way catalyst leaks ammonia, when the adjusted oxygen concentration data is less than the data before adjustment, it is determined that ammonia leakage occurs; otherwise, it is determined that ammonia leakage does not occur. Then, according to the judgment result of ammonia leakage, the adjustment direction of the subsequent air-fuel ratio set value is guided. In the case that ammonia leakage occurs, the same adjustment direction as the last time is maintained; in the case that ammonia leakage does not occur, the adjustment direction opposite to the last time is adopted. Finally, by circulating the determination step and the adjustment step, the continuous monitoring of the three-way catalyst ammonia leakage and the dynamic adjustment of the air-fuel ratio set value are further realized, so that the effect of accurately identifying the ammonia leakage in the three-way catalyst is further achieved.

[0045] Specifically, the adjustment direction in the present adjustment and the last adjustment direction refer to the selected direction when adjusting the air-fuel ratio set value, including increasing or decreasing.

[0046] In another alternative, in the case where it is determined that the three-way catalyst does not leak ammonia, the number of windows in which ammonia does not leak is obtained, including: a counting step, in the case where it is determined that the three-way catalyst does not leak ammonia, controlling the counting value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step, and the counting step, to obtain the number of windows in which ammonia does not leak. In the embodiment, in the case where it is confirmed that the three-way catalyst does not leak ammonia, the number of windows in which ammonia does not leak is counted in a cyclic manner, achieving the effect of accurately monitoring the number of windows in which ammonia does not leak.

[0047] Specifically, the initial value of the counting value is 0; and in the case where the number of windows is greater than or equal to a fourth threshold value, the counting value is reset to 0.

[0048] In another alternative, adjusting the air-fuel ratio set value of the engine in the vehicle includes: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0049] Specifically, the fuel injector is responsible for injecting fuel into the engine cylinder, and the throttle valve is located in front of the engine intake manifold and controls the amount of air entering the cylinder.

[0050] In the embodiment, by adjusting the injection time of the injector, the amount of fuel injected into the cylinder can be controlled. When the amount of fuel increases and the amount of air remains unchanged, the air-fuel ratio decreases; when the amount of fuel decreases and the amount of air remains unchanged, the air-fuel ratio increases. By adjusting the opening degree of the throttle valve, the amount of air entering the cylinder can be controlled. When the opening degree of the throttle valve increases, the amount of air entering the cylinder increases, and when the amount of fuel injection remains unchanged, the air-fuel ratio increases; when the opening degree of the throttle valve decreases, the amount of air entering the cylinder decreases, and when the amount of fuel injection remains unchanged, the air-fuel ratio decreases. Through this adjustment mechanism, the air-fuel ratio of the engine can be flexibly adjusted as needed.

[0051] In some other embodiments, adjusting the air-fuel ratio setting value of the engine in the vehicle comprises: adopting a step-by-step adjustment mode, first adjusting the air-fuel ratio setting value by a predetermined step, observing the change of the reading of the nitrogen oxide sensor. If the reading presents an expected change trend, the current adjustment direction and step are maintained. If the reading does not present an expected change or the change trend is opposite, a reverse adjustment is needed, and the change of the reading of the nitrogen oxide sensor is continuously observed. Based on the change result of the reading, the adjustment is further adjusted until the system can accurately determine whether there is ammonia leakage.

[0052] In some other example embodiments of the present application, before the obtaining step, the method further comprises: obtaining a steady state determination parameter, the steady state determination parameter comprising at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; and determining that the vehicle is in the steady state working condition when the steady state determination parameter meets a preset condition, the preset condition comprising at least part of the following: the rotational speed is within a first preset range, the rotational speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0053] In the embodiments, the determination of whether the vehicle is in the steady state working condition based on at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle, can accurately reflect whether the vehicle is in the steady state working condition, and ensure accurate determination of the working state of the vehicle. Since the operating parameters of the engine are relatively stable when the vehicle is in the steady state working condition, this helps to reduce the interference caused by the change of the working condition, making the subsequent ammonia leakage detection step more effective, and further improving the accuracy and reliability of ammonia leakage detection.

[0054] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the ammonia leakage detection method of the three-way catalyst of the present application will be described in detail below in combination with specific embodiments.

[0055] The present embodiment relates to a specific ammonia leakage detection method of a three-way catalyst, as shown in Figure 3 The method comprises the following steps:

[0056] Step S1: obtaining a time proportion of oxygen concentration data in a window being less than a first threshold value and an oxygen concentration distribution;

[0057] Step S2: judging whether the time proportion is greater than a second threshold value, if the time proportion is greater than the second threshold value, executing step S3, if the time proportion is less than or equal to the second threshold value, executing step S4;

[0058] Step S3: judging whether the oxygen concentration distribution is less than a third threshold value, if the oxygen concentration distribution is less than the third threshold value, determining that the three-way catalyst has ammonia leakage, if the oxygen concentration distribution is greater than or equal to the third threshold value, executing step S4;

[0059] Step S4: in the case of determining that the three-way catalyst does not have ammonia leakage, controlling a count value to increase by 1;

[0060] Step S5: judging whether the count value is greater than or equal to a fourth threshold value, if the count value is greater than or equal to the fourth threshold value, executing step S6, if the count value is less than the fourth threshold value, at least cyclically executing steps S1, S2 and S3;

[0061] Step S6: adjusting an air-fuel ratio set value of the engine, and obtaining oxygen concentration data;

[0062] Step S7: judging whether the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, if the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst has ammonia leakage, if the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst does not have ammonia leakage.

[0063] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from here.

[0064] The embodiment of the present application also provides a three-way catalyst ammonia leakage detection device. It should be noted that the three-way catalyst ammonia leakage detection device of the embodiment of the present application can be used to execute the three-way catalyst ammonia leakage detection method provided by the embodiment of the present application. The device for realizing the embodiment and the preferred embodiment has been described and will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware, or a combination of software and hardware, is also possible and conceived.

[0065] The following describes a device for detecting ammonia leakage of a three-way catalyst provided by an embodiment of the present application.

[0066] Figure 4 is a schematic diagram of a device for detecting ammonia leakage of a three-way catalyst according to an embodiment of the present application. As shown in Figure 4 , the device comprises:

[0067] A first obtaining unit 10 is configured to obtain, in a case where the vehicle is in a steady state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being the oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window.

[0068] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxides and ammonia, and cannot effectively distinguish whether the reading is nitrogen oxides or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and according to the oxygen signal measured by the nitrogen oxide sensor, the current emission type can be directly judged, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completing a preset work means that the engine works normally according to the design requirements, reaches the predetermined output power and efficiency, and thus drives the vehicle to run.

[0069] A first determining unit 20 is configured to determine, in a first determining step, whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value.

[0070] A second determining unit 30 is configured to determine, in a second determining step, that the three-way catalyst has ammonia leakage in a case where the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determine that the three-way catalyst does not have ammonia leakage in a case where the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0071] According to the embodiment, the first acquisition unit acquires, when the vehicle is in a steady state and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window, the first determination unit determines whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value, and the second determination unit determines that the three-way catalyst leaks ammonia when the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determines that the three-way catalyst does not leak ammonia when the time proportion is less than or equal to the second threshold value or when the oxygen concentration distribution is greater than or equal to the third threshold value. According to the oxygen concentration data measured by the nitrogen oxide sensor in a window and the oxygen concentration distribution, the application determines whether the three-way catalyst leaks ammonia, and achieves the effect of accurately identifying whether the three-way catalyst leaks ammonia.

[0072] In another alternative, the apparatus further comprises:

[0073] The second acquisition unit is configured to, when it is determined that the three-way catalyst does not leak ammonia, acquire a number of windows in which ammonia does not leak, different windows corresponding to the same operating condition of the vehicle;

[0074] Specifically, the same operating condition means that the vehicle is in a steady state and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value.

[0075] The adjustment unit is configured to, when the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, adjust the air-fuel ratio set value of the engine in the vehicle, so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and acquire the oxygen concentration data after adjusting the air-fuel ratio set value.

[0076] The third determination unit is configured to determine, according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value, whether the three-way catalyst leaks ammonia.

[0077] In the embodiment, in the case where it is confirmed that the three-way catalyst does not leak ammonia, the number of windows in which ammonia leakage does not occur under the same operating condition is accumulated, and when the number reaches or exceeds a preset threshold, there is a problem that the oxygen concentration data detected by the nitrogen oxide sensor fluctuates greatly due to aging of the three-way catalyst or the like, thereby interfering with the ammonia leakage judgment. At this time, in order to further ensure the accuracy of ammonia leakage monitoring, the air-fuel ratio set value of the vehicle engine is adjusted to be increased, and then the oxygen concentration data before and after the adjustment of the air-fuel ratio set value is compared, and the comparison result is used as a basis for further judging whether the three-way catalyst leaks ammonia. By dynamically adjusting the air-fuel ratio and observing the change in oxygen concentration, the accuracy and sensitivity of ammonia leakage identification are further improved.

[0078] Specifically, in order to meet the technical route of "stoichiometric ratio + three-way catalyst" for natural gas engines, the air-fuel ratio needs to be controlled within a small window so that nitrogen oxides, methane, carbon monoxide, and ammonia can be efficiently converted. When the air-fuel ratio is low and deviates from the emission window, the oxygen concentration will continuously decrease, leading to ammonia leakage. When the three-way catalyst is severely aged, its oxygen storage capacity will decrease significantly, which may cause the oxygen concentration measured by the nitrogen oxide sensor to fluctuate greatly, failing to meet the limit conditions of steps S201, S202, and S203. At this time, the air-fuel ratio set value needs to be actively adjusted, and whether ammonia leakage has occurred is judged according to the change in oxygen concentration data after adjustment. Stoichiometric ratio refers to the molar ratio of catalyst to substrate, and in a three-way catalyst, it usually refers to the molar ratio of nitrogen oxides and carbon monoxide. The selection of stoichiometric ratio has an important influence on the effect of catalytic reaction, and the optimal stoichiometric ratio usually needs to be determined according to the specific reaction conditions and the characteristics of the catalyst.

[0079] In another alternative, the third determining unit comprises:

[0080] The determining module is configured to, in the third determining step, determine that the three-way catalyst leaks ammonia in the case where the oxygen concentration data after adjustment of the air-fuel ratio set value is less than the oxygen concentration data before adjustment of the air-fuel ratio set value, and determine that the three-way catalyst does not leak ammonia in the case where the oxygen concentration data after adjustment of the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjustment of the air-fuel ratio set value.

[0081] The first adjusting module is configured to, in the adjusting step, continue to adjust the air-fuel ratio set value so that, in the case where it is determined that the three-way catalyst leaks ammonia, the adjustment direction of the air-fuel ratio set value in this time is the same as the adjustment direction in the last time, and in the case where it is determined that the three-way catalyst does not leak ammonia, the adjustment direction in this time is opposite to the adjustment direction in the last time.

[0082] The first execution module is configured to execute the third determination step and the adjustment step in a first loop step for a predetermined number of times.

[0083] In the embodiment, firstly, whether ammonia leakage occurs in the three-way catalyst is determined by comparing the oxygen concentration data before and after the adjustment of the air-fuel ratio set value. When the adjusted oxygen concentration data is less than the data before the adjustment, it is determined that ammonia leakage occurs. Otherwise, it is determined that ammonia leakage does not occur. Then, according to the determination result of the ammonia leakage, the adjustment direction of the subsequent air-fuel ratio set value is guided. When it is determined that ammonia leakage occurs, the same adjustment direction as the previous one is maintained. When ammonia leakage does not occur, the adjustment direction opposite to the previous one is adopted. Finally, the determination step and the adjustment step are executed in a loop to further realize continuous monitoring of ammonia leakage in the three-way catalyst and dynamic adjustment of the air-fuel ratio set value, thereby further achieving the effect of accurately identifying ammonia leakage in the three-way catalyst.

[0084] Specifically, the adjustment direction in the current adjustment direction and the last adjustment direction refers to the selected direction when the air-fuel ratio set value is adjusted, including increasing or decreasing.

[0085] In some other example embodiments, the second acquisition unit comprises:

[0086] The control module is configured to execute the counting step, and when it is determined that the three-way catalyst does not occur ammonia leakage, control the counting value to increase by 1.

[0087] The second execution module is configured to execute the acquisition step, the first determination step, the second determination step and the counting step in a second loop step to obtain the number of windows in which ammonia leakage does not occur.

[0088] In the embodiment, when it is confirmed that the three-way catalyst does not occur ammonia leakage, the number of windows in which ammonia leakage does not occur is counted in a loop counting manner, and the effect of accurately monitoring the number of windows in which ammonia leakage does not occur is achieved.

[0089] Specifically, the initial value of the counting value is 0, and when the number of windows is greater than or equal to a fourth threshold value, the counting value is reset to 0.

[0090] In another optional solution, the adjustment unit comprises a second adjustment module configured to adjust the injection time of a fuel injector of the vehicle or adjust the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0091] Specifically, the fuel injector is responsible for injecting fuel into the engine cylinder, and the throttle valve is located in front of the engine intake manifold to control the amount of air entering the cylinder.

[0092] In the embodiment, the fuel injection amount into the cylinder can be controlled by adjusting the injection time of the injector. When the fuel injection amount increases, the air-fuel ratio decreases if the air amount remains unchanged; when the fuel injection amount decreases, the air-fuel ratio increases if the air amount remains unchanged. The air amount into the cylinder can be controlled by adjusting the opening of the throttle valve. When the opening of the throttle valve increases, the air amount into the cylinder increases, and the air-fuel ratio increases if the fuel injection amount remains unchanged; when the opening of the throttle valve decreases, the air amount into the cylinder decreases, and the air-fuel ratio decreases if the fuel injection amount remains unchanged. Through the adjustment mechanism, the air-fuel ratio of the engine can be flexibly adjusted as required.

[0093] In some other embodiments, adjusting the air-fuel ratio set value of the engine in the vehicle comprises: using a step adjustment mode to first finely adjust the air-fuel ratio set value by a predetermined step, observing the change of the reading value of the nitrogen oxide sensor. If the reading value presents an expected change trend, the current adjustment direction and step are maintained; if the reading value does not present the expected change or the change trend is opposite, reverse adjustment is needed, and the change of the reading value of the nitrogen oxide sensor is continuously observed, the fine adjustment is performed based on the change result of the reading value until the system can accurately determine whether there is ammonia leakage.

[0094] In some other exemplary schemes of the present application, the apparatus further comprises:

[0095] The third obtaining unit is configured to obtain a steady state determination parameter before the obtaining step, the steady state determination parameter comprising at least part of the following: the rotation speed of the engine, the rotation speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle;

[0096] The fourth determining unit is configured to determine that the vehicle is in the steady state working condition if the steady state determination parameter meets a preset condition, the preset condition comprising at least part of the following: the rotation speed is within a first preset range, the rotation speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0097] In the embodiment, whether the vehicle is in the steady state working condition is determined according to at least part of the engine speed, the engine speed change rate, the engine intake charge, the intake charge change rate, the engine water temperature, the temperature of the three-way catalyst, the mass flow of the exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle, which can accurately reflect whether the vehicle is in the steady state working condition, and ensure accurate judgment of the working state of the vehicle. Since the operating parameters of the engine are relatively stable when the vehicle is in the steady state working condition, it is helpful to reduce the interference caused by the change of the working condition, so that the subsequent ammonia leakage detection step is more effective, and the accuracy and reliability of ammonia leakage detection are further improved.

[0098] The three-way catalyst ammonia leakage detection device includes a processor and a memory, and the first acquisition unit, the first determination unit and the second determination unit are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or the modules are located in different processors in any combination.

[0099] The processor includes a core, and the core calls the corresponding program unit from the memory. The core can be one or more, and the core parameters are adjusted to at least solve the problem that the ammonia leakage in the three-way catalyst is difficult to accurately identify in the prior art.

[0100] The memory can include a non-permanent memory in a computer readable medium, a random access memory (RAM) and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory includes at least one memory chip.

[0101] The embodiment of the application provides a computer readable storage medium, which includes a stored program, wherein when the program runs, the device where the computer readable storage medium is located executes the three-way catalyst ammonia leakage detection method.

[0102] Specifically, the three-way catalyst ammonia leakage detection method includes:

[0103] In step S201, the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion of the oxygen concentration data less than a first threshold value in a window and the oxygen concentration distribution are acquired, the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in the exhaust pipe of the three-way catalyst, the oxygen concentration data is the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution is the distribution of the oxygen concentration data in the window.

[0104] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxides and ammonia, and cannot effectively distinguish whether the reading is nitrogen oxides or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and according to the oxygen signal measured by the nitrogen oxide sensor, the current emission type can be directly judged, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completes the preset work refers to that the engine works normally according to the design requirements, reaches the predetermined output power and efficiency, and thus drives the vehicle to run.

[0105] Step S202, a first determination step, determines whether the time ratio is greater than a second threshold value, and whether the oxygen concentration distribution is less than a third threshold value;

[0106] Step S203, a second determination step, determines that the three-way catalyst leaks ammonia when the time ratio is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value; and determines that the three-way catalyst does not leak ammonia when the time ratio is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0107] Optionally, the method further comprises: in the case where it is determined that the three-way catalyst does not leak ammonia, obtaining the number of windows in which ammonia does not leak, different windows corresponding to the same operating condition of the vehicle; in the case where the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, adjusting the air-fuel ratio set value of the engine in the vehicle, so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio set value; according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value, at least determining whether the three-way catalyst leaks ammonia.

[0108] Optionally, the determining whether the three-way catalyst leaks ammonia based on the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determining step of determining that the three-way catalyst leaks ammonia when the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, and determining that the three-way catalyst does not leak ammonia when the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value; an adjusting step of continuing to adjust the air-fuel ratio set value, so that the direction of the current adjustment of the air-fuel ratio set value is the same as the direction of the last adjustment when it is determined that the three-way catalyst leaks ammonia, and the direction of the current adjustment is opposite to the direction of the last adjustment when it is determined that the three-way catalyst does not leak ammonia; and a first cycling step of cyclically executing the third determining step and the adjusting step for a predetermined number of times.

[0109] Optionally, when it is determined that the three-way catalyst does not leak ammonia, the number of windows in which the three-way catalyst does not leak ammonia is obtained, comprising: a counting step of increasing a counting value by 1 when it is determined that the three-way catalyst does not leak ammonia; and a second cycling step of cyclically executing the obtaining step, the first determining step, the second determining step, and the counting step to obtain the number of windows in which the three-way catalyst does not leak ammonia.

[0110] Optionally, the adjusting the air-fuel ratio set value of the engine in the vehicle comprises: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0111] Optionally, before the obtaining step, the method further comprises: obtaining a steady state determining parameter, the steady state determining parameter comprising at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; and determining that the vehicle is in the steady state working condition when the steady state determining parameter meets a preset condition, the preset condition comprising at least part of the following: the rotational speed is within a first preset range, the rotational speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0112] The embodiment of the present application provides a processor used for running a program, wherein the program performs the method for detecting ammonia leakage of a three-way catalyst.

[0113] Specifically, the method for detecting ammonia leakage of a three-way catalyst comprises the following steps.

[0114] In step S201, when the vehicle is in a steady state and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion of the oxygen concentration data less than a first threshold value and the oxygen concentration distribution in a window are obtained, the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data is the oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution is the distribution of the oxygen concentration data in the window.

[0115] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxide and ammonia, and cannot effectively distinguish whether the reading value is nitrogen oxide or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and the oxygen signal measured by the nitrogen oxide sensor can be used to directly determine the current emission type, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completing a preset work means that the engine normally works according to the design requirements, achieves a predetermined output power and efficiency, and thus drives the vehicle to run.

[0116] In step S202, it is determined whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value.

[0117] In step S203, in the case that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that the three-way catalyst has ammonia leakage; in the case that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that the three-way catalyst does not have ammonia leakage.

[0118] Optionally, the method further comprises the following steps: in the case that it is determined that the three-way catalyst does not have ammonia leakage, the number of windows in which ammonia leakage does not occur is obtained, different windows correspond to the same running condition of the vehicle; in the case that the number of windows in which ammonia leakage does not occur is greater than or equal to a fourth threshold value, the air-fuel ratio set value of the engine in the vehicle is adjusted, so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and the oxygen concentration data after the air-fuel ratio set value is adjusted is obtained; according to the size relationship between the oxygen concentration data after the air-fuel ratio set value is adjusted and the oxygen concentration data before the air-fuel ratio set value is adjusted, it is determined whether the three-way catalyst has ammonia leakage.

[0119] Optionally, the determining whether the three-way catalyst leaks ammonia based on the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determining step of determining that the three-way catalyst leaks ammonia in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, and determining that the three-way catalyst does not leak ammonia in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value; an adjusting step of continuing to adjust the air-fuel ratio set value, so that the direction of the current adjustment of the air-fuel ratio set value is the same as the direction of the last adjustment in a case where it is determined that the three-way catalyst leaks ammonia, and the direction of the current adjustment is opposite to the direction of the last adjustment in a case where it is determined that the three-way catalyst does not leak ammonia; and a first cycling step of cyclically executing the third determining step and the adjusting step for a predetermined number of times.

[0120] Optionally, in a case where it is determined that the three-way catalyst does not leak ammonia, the number of windows in which the three-way catalyst does not leak ammonia is obtained, comprising: a counting step of increasing a counting value by 1 in a case where it is determined that the three-way catalyst does not leak ammonia; and a second cycling step of cyclically executing the obtaining step, the first determining step, the second determining step, and the counting step to obtain the number of windows in which the three-way catalyst does not leak ammonia.

[0121] Optionally, the adjusting the air-fuel ratio set value of the engine in the vehicle comprises: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0122] Optionally, before the obtaining step, the method further comprises: obtaining a steady state determination parameter, the steady state determination parameter comprising at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; and determining that the vehicle is in the steady state working condition in a case where the steady state determination parameter satisfies a preset condition, the preset condition comprising at least part of the following: the rotational speed is within a first preset range, the rotational speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0123] The application also provides a computer program product comprising computer instructions which, when executed by a processor, implement at least the following method steps:

[0124] In step S201, when the vehicle is in a steady state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the proportion of time in a window during which the oxygen concentration data is less than a first threshold value and the oxygen concentration distribution are obtained, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being the oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window.

[0125] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxides and ammonia, and cannot effectively distinguish whether the reading is nitrogen oxides or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and the oxygen signal measured by the nitrogen oxide sensor can directly determine the current emission type, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completing a preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0126] In step S202, a first determination step is performed to determine whether the proportion of time is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value.

[0127] In step S203, a second determination step is performed to determine whether the three-way catalyst leaks ammonia when the proportion of time is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and to determine that the three-way catalyst does not leak ammonia when the proportion of time is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0128] Optionally, the method further comprises: when it is determined that the three-way catalyst does not leak ammonia, obtaining the number of windows in which ammonia does not leak, different windows corresponding to the same operating condition of the vehicle; when the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, adjusting the air-fuel ratio set value of the engine in the vehicle so that the adjusted air-fuel ratio set value is greater than the unadjusted air-fuel ratio set value, and obtaining the oxygen concentration data after adjusting the air-fuel ratio set value; and determining at least whether the three-way catalyst leaks ammonia according to the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value.

[0129] Optionally, the determining whether the three-way catalyst leaks ammonia based on the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determining step of determining that the three-way catalyst leaks ammonia when the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, and determining that the three-way catalyst does not leak ammonia when the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value; an adjusting step of continuing to adjust the air-fuel ratio set value, so that the direction of the current adjustment of the air-fuel ratio set value is the same as the direction of the last adjustment when it is determined that the three-way catalyst leaks ammonia, and the direction of the current adjustment is opposite to the direction of the last adjustment when it is determined that the three-way catalyst does not leak ammonia; and a first cycling step of cyclically executing the third determining step and the adjusting step for a predetermined number of times.

[0130] Optionally, when it is determined that the three-way catalyst does not leak ammonia, the number of windows in which the three-way catalyst does not leak ammonia is obtained, comprising: a counting step of increasing a counting value by 1 when it is determined that the three-way catalyst does not leak ammonia; and a second cycling step of cyclically executing the obtaining step, the first determining step, the second determining step, and the counting step to obtain the number of windows in which the three-way catalyst does not leak ammonia.

[0131] Optionally, the adjusting the air-fuel ratio set value of the engine in the vehicle comprises: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0132] Optionally, before the obtaining step, the method further comprises: obtaining a steady state determining parameter, the steady state determining parameter comprising at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; and determining that the vehicle is in the steady state working condition when the steady state determining parameter meets a preset condition, the preset condition comprising at least part of the following: the rotational speed is within a first preset range, the rotational speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0133] The embodiments of the present application also provide an electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs include instructions for performing any of the methods. The one or more processors implement at least the following steps when executing the programs:

[0134] In step S201, in a case where the vehicle is in a steady state working condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window.

[0135] Specifically, the nitrogen oxide sensor has cross-sensitivity to nitrogen oxide and ammonia, and cannot effectively distinguish whether the reading value is nitrogen oxide or ammonia. However, the nitrogen oxide sensor can measure the oxygen concentration in the exhaust gas, and the oxygen signal measured by the nitrogen oxide sensor can directly determine the current emission type, so that the ammonia window can be effectively identified according to the oxygen concentration. The engine completing a preset work means that the engine normally works according to the design requirements, achieves a predetermined output power and efficiency, and thus promotes the vehicle to run.

[0136] In step S202, a first determination step is performed to determine whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value.

[0137] In step S203, a second determination step is performed to determine that the three-way catalyst leaks ammonia in a case where the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determine that the three-way catalyst does not leak ammonia in a case where the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0138] Optionally, the method further comprises: in a case where it is determined that the three-way catalyst does not leak ammonia, acquiring a number of windows in which ammonia does not leak, different windows corresponding to the same working condition of the vehicle; in a case where the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, adjusting an air-fuel ratio set value of the engine in the vehicle, so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and acquiring the oxygen concentration data after adjusting the air-fuel ratio set value; and determining at least whether the three-way catalyst leaks ammonia according to a size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value.

[0139] Optionally, the determining whether the three-way catalyst leaks ammonia based on the size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determining step of determining that the three-way catalyst leaks ammonia in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, and determining that the three-way catalyst does not leak ammonia in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value; an adjusting step of continuing to adjust the air-fuel ratio set value, so that the direction of the current adjustment of the air-fuel ratio set value is the same as the direction of the last adjustment in a case where it is determined that the three-way catalyst leaks ammonia, and the direction of the current adjustment is opposite to the direction of the last adjustment in a case where it is determined that the three-way catalyst does not leak ammonia; and a first loop step of cyclically executing the third determining step and the adjusting step for a predetermined number of times.

[0140] Optionally, in a case where it is determined that the three-way catalyst does not leak ammonia, the number of windows in which the three-way catalyst does not leak ammonia is obtained, comprising: a counting step of increasing a counting value by 1 in a case where it is determined that the three-way catalyst does not leak ammonia; and a second loop step of cyclically executing the obtaining step, the first determining step, the second determining step, and the counting step to obtain the number of windows in which the three-way catalyst does not leak ammonia.

[0141] Optionally, the adjusting the air-fuel ratio set value of the engine in the vehicle comprises: adjusting the injection time of a fuel injector of the vehicle or adjusting the opening degree of a throttle valve of the vehicle, so as to adjust the air-fuel ratio set value of the engine in the vehicle.

[0142] Optionally, before the obtaining step, the method further comprises: obtaining a steady state determination parameter, the steady state determination parameter comprising at least part of the following: the rotational speed of the engine, the rotational speed change rate, the intake charge of the engine, the intake charge change rate, the water temperature of the engine, the temperature of the three-way catalyst, the mass flow of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; and determining that the vehicle is in the steady state working condition in a case where the steady state determination parameter meets a preset condition, the preset condition comprising at least part of the following: the rotational speed is within a first preset range, the rotational speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0143] The device herein can be a server, a PC, a PAD, a mobile phone, etc.

[0144] It is apparent that those skilled in the art should understand that the modules or steps of the present application described above can be realized by using universal computing devices, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by using program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different orders, or they can be respectively manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any particular combination of hardware and software.

[0145] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product in the form of being implemented on one or more computer usable storage media containing computer usable program codes (including but not limited to disk storage, CD-ROM, optical storage, etc.).

[0146] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks. Figure 1 The devices that realize the functions specified in one or more flows and / or blocks.

[0147] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a manufactured product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks. Figure 1 The devices that realize the functions specified in one or more flows and / or blocks.

[0148] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 Figure 1

[0149] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0150] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the processor can execute instructions. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, or other memory technologies, CD-ROM, digital versatile disc (DVD), or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information for access by a computing device. In no case does the medium include a transitory signal per se.

[0151] Computer readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology for storage of information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device, or any other non-transitory medium that can be used to store information that can be accessed by a computing device. According to the definition herein, computer readable media does not include transitory computer readable media, such as modulated data signals and carrier waves.

[0152] It should also be noted that the terms "comprising", "containing", or any other variant thereof, are intended to encompass a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0153] From the above description, it can be seen that the embodiments described in the present application achieve the following technical effects:

[0154] ​​1) The method for detecting ammonia leakage of a three-way catalyst of the application, first, under the condition that the vehicle is in a steady state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion of the oxygen concentration data being less than a first threshold value and the oxygen concentration distribution in a window are obtained, then it is determined whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value, under the condition that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that the three-way catalyst has ammonia leakage, under the condition that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that the three-way catalyst has no ammonia leakage. According to the oxygen concentration data measured by the nitrogen oxide sensor in a window and the oxygen concentration distribution, the application determines whether the three-way catalyst has ammonia leakage, which achieves the effect of accurately identifying whether the three-way catalyst has ammonia leakage.

[0155] 2) The device for detecting ammonia leakage of a three-way catalyst of the application, through the first acquisition unit, under the condition that the vehicle is in a steady state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion of the oxygen concentration data being less than a first threshold value and the oxygen concentration distribution in a window are obtained, through the first determination unit, it is determined whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value, through the second determination unit, under the condition that the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that the three-way catalyst has ammonia leakage, under the condition that the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that the three-way catalyst has no ammonia leakage. According to the oxygen concentration data measured by the nitrogen oxide sensor in a window and the oxygen concentration distribution, the application determines whether the three-way catalyst has ammonia leakage, which achieves the effect of accurately identifying whether the three-way catalyst has ammonia leakage.

[0156] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various changes and modifications to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for detecting ammonia slip of a three-way catalyst, the three-way catalyst being located in a vehicle, characterized by, The method comprises: an acquisition step, in a case where the vehicle is in a steady state working condition and the oxygen concentration data detected by a nitrogen oxide sensor is greater than a preset value, acquiring a time proportion of the oxygen concentration data being less than a first threshold value and an oxygen concentration distribution within a window, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data within the window; a first determination step, determining whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determination step, in a case where the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, determining that the three-way catalyst leaks ammonia, and in a case where the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, determining that the three-way catalyst does not leak ammonia.

2. The method of claim 1, wherein, The method further comprises: in a case where it is determined that the three-way catalyst does not leak ammonia, acquiring a number of windows in which ammonia does not leak, different windows corresponding to the same working condition of the vehicle; in a case where the number of windows in which ammonia does not leak is greater than or equal to a fourth threshold value, adjusting an air-fuel ratio set value of the engine in the vehicle, so that the adjusted air-fuel ratio set value is greater than the air-fuel ratio set value before adjustment, and acquiring the oxygen concentration data after adjusting the air-fuel ratio set value; determining at least whether the three-way catalyst leaks ammonia according to a size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value.

3. The method of claim 2, wherein, Determining at least whether the three-way catalyst leaks ammonia according to a size relationship between the oxygen concentration data after adjusting the air-fuel ratio set value and the oxygen concentration data before adjusting the air-fuel ratio set value comprises: a third determination step, in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is less than the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst leaks ammonia, and in a case where the oxygen concentration data after adjusting the air-fuel ratio set value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio set value, determining that the three-way catalyst does not leak ammonia; an adjustment step, continuing to adjust the air-fuel ratio set value, so that in a case where it is determined that the three-way catalyst leaks ammonia, a current adjustment direction of the air-fuel ratio set value is the same as a previous adjustment direction, and in a case where it is determined that the three-way catalyst does not leak ammonia, the current adjustment direction is opposite to the previous adjustment direction; a first circulation step, cyclically executing the third determination step and the adjustment step for a predetermined number of times.

4. The method of claim 2, wherein, In a case where it is determined that the three-way catalyst does not leak ammonia, acquiring the number of windows in which ammonia does not leak comprises: a counting step, in a case where it is determined that the three-way catalyst does not leak ammonia, a count value is increased by 1; a second cycle step, the obtaining step, the first determining step, the second determining step and the counting step are cyclically executed to obtain a number of the windows in which ammonia is not leaked.

5. The method of claim 2, wherein, adjusting an air-fuel ratio set value of the engine in the vehicle, including: adjusting an injection time of a fuel injector of the vehicle or adjusting a throttle opening degree of the vehicle, thereby adjusting the air-fuel ratio set value of the engine in the vehicle.

6. The method according to any one of claims 1 to 5, characterized in that, Before the obtaining step, the method further includes: obtaining a steady state determining parameter, the steady state determining parameter including at least part of the following: a rotation speed of the engine, a rotation speed change rate, an intake charge of the engine, an intake charge change rate, a water temperature of the engine, a temperature of the three-way catalyst, a mass flow of exhaust gas in the exhaust pipe, an operating state of the nitrogen oxide sensor and an operating state of the vehicle; in a case where the steady state determining parameter meets a preset condition, determining that the vehicle is in the steady state, the preset condition including at least part of the following: the rotation speed being in a first preset range, the rotation speed change rate being in a second preset range, the intake charge being in a third preset range, the intake charge change rate being in a fourth preset range, the water temperature being in a fifth preset range, the temperature being in a sixth preset range, the mass flow being in a seventh preset range, the nitrogen oxide sensor being in a normal operating state and the vehicle being in a normal operating state.

7. An apparatus for detecting ammonia slip from a three-way catalyst, the three-way catalyst being located in a vehicle, characterized by including: a first obtaining unit, configured to obtain, in a case where the vehicle is in a steady state and an oxygen concentration data detected by a nitrogen oxide sensor is greater than a preset value, a time proportion of a window in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in an exhaust pipe of the three-way catalyst, the oxygen concentration data being an oxygen concentration of exhaust gas in the exhaust pipe of the three-way catalyst, and the oxygen concentration distribution being a distribution of the oxygen concentration data in the window; a first determining unit, configured to determine, in a first determining step, whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determining unit, configured to determine, in a second determining step, that the three-way catalyst leaks ammonia in a case where the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determine that the three-way catalyst does not leak ammonia in a case where the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium includes a stored program, wherein the program controls a device in which the computer readable storage medium is located to execute the method of any one of claims 1 to 6 when the program is run.

9. A computer program product comprising computer instructions, characterized in that, The computer instructions are executed by the processor to implement the method of any one of claims 1 to 6.

10. An electronic device, comprising: including: one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including programs for performing the method of any one of claims 1 to 6.

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