Three-way catalytic converter efficiency diagnosis and control method, device, vehicle and storage medium

Abstract

The present invention discloses a three-way catalytic converter efficiency diagnosis and control method, device, vehicle, and storage medium. The three-way catalytic converter efficiency diagnosis and control method includes: obtaining the initial oxygen storage, current oxygen storage, and current carrier temperature under the condition of triggering oxygen storage calculation enablement; and determining the current oxygen storage calculation count corresponding to the current oxygen storage when the current oxygen storage is greater than a first set oxygen storage limit; if the oxygen storage difference between the initial oxygen storage and the current oxygen storage is less than or equal to a second set oxygen storage limit, and / or the current oxygen storage calculation count is greater than or equal to the set oxygen storage calculation count, obtaining a weighted oxygen storage value and a weighted oxygen storage count; if the weighted oxygen storage count is greater than or equal to the weighted oxygen storage count limit, determining whether a three-way catalytic converter low efficiency fault exists based on the weighted oxygen storage value. The present invention improves the accuracy of three-way catalytic converter efficiency diagnosis and reduces false fault alarms.

Description

Technical Field

[0001] The present invention relates to the technical field of three-way catalytic converter efficiency diagnosis and control, and in particular to a three-way catalytic converter efficiency diagnosis and control method, device, vehicle and storage medium. Background Art

[0002] The three-way catalytic converter (TWC) is a core component in natural gas engine aftertreatment. Its efficiency determines the engine's emissions. Efficiency diagnosis of the TWC is a reasonable measure for assessing its service life. However, existing technologies are not fully capable of this, leading to abnormal TWC efficiency calculations that can lead to false fault reports and directly impact the driving experience. Therefore, improving the accuracy of TWC efficiency diagnosis has become a pressing issue. Summary of the Invention

[0003] The present invention provides a three-way catalytic converter efficiency diagnosis and control method, device, vehicle and storage medium to solve the problem that the current three-way catalytic converter efficiency diagnosis is prone to cause market false alarm failures and cannot ensure the accuracy of three-way catalytic converter efficiency diagnosis.

[0004] According to one aspect of the present invention, a three-way catalytic converter efficiency diagnosis and control method is provided, the three-way catalytic converter efficiency diagnosis and control method comprising:

[0005] Under the condition that the oxygen storage calculation is enabled, obtaining the initial oxygen storage capacity, the current oxygen storage capacity, and the current carrier temperature, and determining the current oxygen storage calculation number corresponding to the current oxygen storage capacity when the current oxygen storage capacity is greater than a first set oxygen storage capacity limit;

[0006] If the oxygen storage difference between the initial oxygen storage capacity and the current oxygen storage capacity is less than or equal to a second set oxygen storage capacity limit, and / or the current oxygen storage capacity calculation number is greater than or equal to a set oxygen storage capacity calculation number, then obtaining a weighted oxygen storage capacity value and a weighted oxygen storage capacity number;

[0007] If the weighted oxygen storage times are greater than or equal to the weighted oxygen storage times limit, it is determined whether a three-way catalytic converter low efficiency fault exists according to the weighted oxygen storage value.

[0008] Optionally, after obtaining the initial oxygen storage capacity, the current oxygen storage capacity, and the current carrier temperature, the following steps are further included:

[0009] If the current oxygen storage amount is less than or equal to the first set oxygen storage amount limit, it is determined that an abnormal fault of the three-way catalytic converter exists.

[0010] Optionally, the oxygen storage capacity calculation enabling condition includes a carrier temperature condition, an engine target continuous running time, and an engine operating condition, wherein the engine target continuous running time is corrected based on the ambient temperature.

[0011] Optionally, the three-way catalytic converter efficiency diagnosis and control method further includes:

[0012] If the oxygen storage difference is greater than a second set oxygen storage limit, and the current oxygen storage calculation times are less than the set oxygen storage calculation times, then increasing the current carrier temperature by the set temperature value to obtain the sample carrier temperature;

[0013] A carrier temperature condition is determined based on the sample carrier temperature.

[0014] Optionally, determining the carrier temperature condition according to the sample carrier temperature includes:

[0015] If the sample carrier temperature is less than the carrier temperature limit, the sample carrier temperature is used as the carrier temperature condition;

[0016] If the sample carrier temperature is greater than or equal to the carrier temperature limit, the carrier temperature limit is used as the carrier temperature condition.

[0017] Optionally, determining whether a three-way catalytic converter low efficiency fault occurs according to the weighted oxygen storage value includes:

[0018] If the weighted oxygen storage value is less than the set weighted oxygen storage threshold, it is determined that a three-way catalytic converter low efficiency fault exists.

[0019] Optionally, the three-way catalytic converter efficiency diagnosis and control method further includes:

[0020] If the weighted oxygen storage number of times is less than the weighted oxygen storage number limit, the oxygen storage calculation enabling time is controlled to be zero, and the current oxygen storage calculation enabling cumulative time is obtained;

[0021] When the current oxygen storage capacity calculation enabling cumulative time is greater than or equal to the calculation enabling cumulative time setting value, the oxygen storage capacity calculation enabling condition is re-triggered.

[0022] According to another aspect of the present invention, a three-way catalytic converter efficiency diagnosis and control device is provided, the three-way catalytic converter efficiency diagnosis and control device comprising:

[0023] an oxygen storage amount calculation times determination module, configured to obtain the initial oxygen storage amount, the current oxygen storage amount, and the current carrier temperature under the condition that the oxygen storage amount calculation is triggered, and determine the current oxygen storage amount calculation times corresponding to the current oxygen storage amount when the current oxygen storage amount is greater than a first set oxygen storage amount limit;

[0024] a weighted oxygen storage determination module, configured to obtain a weighted oxygen storage value and a weighted oxygen storage count if a difference between the initial oxygen storage and the current oxygen storage is less than or equal to a second set oxygen storage limit, and / or if the current oxygen storage calculation count is greater than or equal to a set oxygen storage calculation count;

[0025] The fault judgment module is used to determine whether there is a low efficiency fault of the three-way catalytic converter according to the weighted oxygen storage value if the weighted oxygen storage number is greater than or equal to the weighted oxygen storage number limit.

[0026] According to another aspect of the present invention, there is provided a vehicle, comprising:

[0027] at least one processor; and

[0028] a memory communicatively connected to the at least one processor; wherein,

[0029] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the three-way catalytic converter efficiency diagnosis and control method described in any embodiment of the present invention.

[0030] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the three-way catalytic converter efficiency diagnosis and control method described in any embodiment of the present invention when executed.

[0031] The technical solution of the embodiment of the present invention is to obtain the initial oxygen storage amount, the current oxygen storage amount, and the current carrier temperature under the condition of triggering the oxygen storage amount calculation enablement, and determine the current oxygen storage amount calculation count corresponding to the current oxygen storage amount when the current oxygen storage amount is greater than a first set oxygen storage amount limit; if the oxygen storage amount difference between the initial oxygen storage amount and the current oxygen storage amount is less than or equal to a second set oxygen storage amount limit, and / or the current oxygen storage amount calculation count is greater than or equal to the set oxygen storage amount calculation count, then obtain a weighted oxygen storage amount value and a weighted oxygen storage amount count; if the weighted oxygen storage amount count is greater than or equal to the weighted oxygen storage amount count limit, determine whether there is a three-way catalytic converter low efficiency fault based on the weighted oxygen storage amount value. The present invention solves the problem that the current three-way catalytic converter efficiency diagnosis is prone to false fault reports in the market and cannot guarantee the accuracy of the three-way catalytic converter efficiency diagnosis, thereby improving the accuracy of the three-way catalytic converter efficiency diagnosis and reducing false fault reports.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a flow chart of a three-way catalytic converter efficiency diagnosis and control method provided according to the first embodiment of the present invention;

[0035] Figure 2 This is a flow chart of a three-way catalytic converter efficiency diagnosis and control method provided in accordance with the second embodiment of the present invention;

[0036] Figure 3 1 is a schematic diagram of a three-way catalytic converter low efficiency fault reporting process according to the second embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of an example of a false alarm of a three-way catalytic converter low efficiency fault applicable to the second embodiment of the present invention;

[0038] Figure 5 2 is a schematic structural diagram of a three-way catalytic converter efficiency diagnosis and control device provided according to a third embodiment of the present invention;

[0039] Figure 6 It is a structural schematic diagram of a vehicle for implementing the three-way catalytic converter efficiency diagnosis and control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Example 1

[0043] Figure 1 A flowchart of a three-way catalytic converter efficiency diagnosis and control method is provided for the first embodiment of the present invention. This embodiment is applicable to the situation where the status of a three-way catalytic converter is monitored. The three-way catalytic converter efficiency diagnosis and control method can be executed by a three-way catalytic converter efficiency diagnosis and control device. The three-way catalytic converter efficiency diagnosis and control device can be implemented in the form of hardware and / or software. The three-way catalytic converter efficiency diagnosis and control device can be configured in a vehicle exhaust system or a vehicle controller. Figure 1 As shown, the three-way catalytic converter efficiency diagnosis and control method includes:

[0044] S110. Under a condition where oxygen storage calculation is triggered and enabled, obtaining an initial oxygen storage capacity, a current oxygen storage capacity, and a current carrier temperature, and determining a current oxygen storage calculation count corresponding to the current oxygen storage capacity when the current oxygen storage capacity is greater than a first set oxygen storage capacity limit.

[0045] As we know, the oxygen storage material coating in the catalyst can oxidize Ce2O3 to CeO2 in the presence of oxygen. The oxygen storage capacity is calculated based on the engine's reverse-tow condition (i.e., fuel-off condition). When the engine is in fuel-off mode (understandably, the engine is not in a stopped fuel-off state at this time), oxygen in the air reacts with Ce2O3 to form CeO2. Only when the temperature is high enough and the time is long enough will all the Ce2O3 in the catalyst be converted to CeO2. This process is called oxygen storage.

[0046] Furthermore, when the engine exits the fuel-off state and the fuel is enriched, the post-oxygen signal can be used to determine whether the enrichment amount is sufficient to react with Ce2O3 to form CeO2 (whether CeO2 is completely reduced to Ce2O3). The oxygen content stored in the coating layer can be inferred from the final enrichment amount, which is the oxygen storage capacity of the catalyst. This process is called deoxygenation. It is understood that the current oxygen storage capacity in this embodiment is the oxygen storage capacity of the three-way catalytic converter obtained during the deoxygenation process. The specific method for obtaining the current oxygen storage capacity can be obtained using existing oxygen storage calculation methods, and this embodiment does not impose any restrictions on this.

[0047] Similarly, the current carrier temperature is the carrier temperature of the three-way catalytic converter. The current carrier temperature can be detected by a temperature sensor or obtained by other means, and this embodiment does not impose any limitation on this.

[0048] Among them, the oxygen storage calculation enabling condition is an enabling condition for triggering the calculation of the oxygen storage amount, that is, when the oxygen storage calculation enabling condition is triggered, the operation of calculating the oxygen storage amount is triggered. The oxygen storage calculation enabling condition includes the carrier temperature condition, the engine target continuous running time and the engine operating condition. In this embodiment, the carrier temperature condition, the engine target continuous running time and the engine operating condition included in the oxygen storage calculation enabling condition all meet a certain range condition, which triggers the calculation of the oxygen storage amount.

[0049] The default value of the initial oxygen storage capacity is a calibration value. In combination with the solution of the present application, the initial oxygen storage capacity here will be updated with the first weighted oxygen storage value. The updated initial oxygen storage capacity value is the current weighted oxygen storage value. The initial oxygen storage capacity can be read or pre-calibrated through the corresponding memory or storage module. This embodiment does not impose any restrictions on this.

[0050] Specifically, under the condition of triggering the oxygen storage calculation enablement, the corresponding current oxygen storage calculation times are determined based on the obtained initial oxygen storage, current oxygen storage and current carrier temperature, specifically: when the current oxygen storage is greater than the first set oxygen storage limit, the current oxygen storage calculation times corresponding to the current oxygen storage are determined; if the current oxygen storage is less than or equal to the first set oxygen storage limit, it is determined that there is an abnormal fault in the three-way catalytic converter.

[0051] The first set oxygen storage limit is a limit for determining whether the oxygen storage obtained at the time is accumulated, that is, the current oxygen storage calculation times corresponding to the current oxygen storage are generated. The current oxygen storage calculation times are the accumulated times of oxygen storage that meets the first set oxygen storage limit. The first set oxygen storage limit can be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any restrictions on this.

[0052] S120: If the oxygen storage difference between the initial oxygen storage capacity and the current oxygen storage capacity is less than or equal to a second set oxygen storage capacity limit, and / or the current oxygen storage capacity calculation times is greater than or equal to a set oxygen storage capacity calculation times, then obtain a weighted oxygen storage capacity value and a weighted oxygen storage capacity times.

[0053] In this embodiment, when the current oxygen storage capacity is greater than the first set oxygen storage capacity limit, the current oxygen storage capacity calculation times corresponding to the current oxygen storage capacity is recorded, and the size relationship between the oxygen storage capacity difference between the initial oxygen storage capacity and the current oxygen storage capacity and the second set oxygen storage capacity limit is further judged, specifically: if the oxygen storage capacity difference between the initial oxygen storage capacity and the current oxygen storage capacity is less than or equal to the second set oxygen storage capacity limit, and / or the current oxygen storage capacity calculation times is greater than or equal to the set oxygen storage capacity calculation times, then the weighted oxygen storage value and the weighted oxygen storage times are obtained; if the oxygen storage capacity difference is greater than the second set oxygen storage capacity limit, and the current oxygen storage capacity calculation times is less than the set oxygen storage capacity calculation times, then the current carrier temperature is increased by the set temperature value to obtain the sample carrier temperature.

[0054] Among them, the second set oxygen storage limit and the set oxygen storage calculation times are oxygen storage limits for determining whether to calculate the weighted oxygen storage value and accumulate the weighted oxygen storage times. The weighted oxygen storage times are the accumulated times of oxygen storage that meets the second set oxygen storage limit. Among them, the second set oxygen storage limit and the set oxygen storage calculation times can be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any restrictions on this.

[0055] Oxygen storage capacity usually adopts a weighted algorithm. The specific calculation formula of the weighted oxygen storage value is:

[0056] EWMA OSC=k*OSC1+(1-k)*OSC2

[0057] Among them, k is the weighting coefficient; EWMA OSC is the weighted oxygen storage value corresponding to the current oxygen storage; OSC1 is the original value of oxygen storage; OSC2 is the current oxygen storage.

[0058] It should be noted that when the weighted oxygen storage value is calculated next time, the weighted oxygen storage value corresponding to the current oxygen storage value is used as the original oxygen storage value and substituted into the specific calculation formula of the weighted oxygen storage value for calculation.

[0059] Based on the above embodiment, after the current carrier temperature is increased by the set temperature value to obtain the sample carrier temperature, the carrier temperature condition is determined according to the sample carrier temperature, that is, the carrier temperature in the carrier temperature condition is updated according to the sample carrier temperature, and then it is determined whether the carrier temperature condition still meets the triggering oxygen storage capacity calculation enablement condition.

[0060] Specifically, if the sample carrier temperature is less than the carrier temperature limit, the sample carrier temperature is used as the target carrier temperature, and the target carrier temperature is used as the carrier temperature condition; if the sample carrier temperature is greater than or equal to the carrier temperature limit, the carrier temperature limit is used as the carrier temperature condition.

[0061] The set temperature value is a temperature limit value for determining whether the target carrier temperature can be used as the carrier temperature condition. The set temperature value can be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any limitation on this.

[0062] The carrier temperature limit is the temperature limit that the three-way catalytic converter carrier can withstand. The carrier temperature limit can be determined based on the properties of the three-way catalytic converter itself, or can be selected and set by those skilled in the art based on the properties of the three-way catalytic converter itself. This embodiment does not impose any restrictions on this.

[0063] S130: If the weighted oxygen storage times are greater than or equal to the weighted oxygen storage times limit, determine whether a three-way catalytic converter low efficiency fault exists based on the weighted oxygen storage value.

[0064] Specifically, if the weighted oxygen storage times are greater than the weighted oxygen storage times limit, and the weighted oxygen storage value is less than the set weighted oxygen storage threshold, it is determined that there is a three-way catalytic converter low efficiency fault; if the weighted oxygen storage times are less than or equal to the weighted oxygen storage times limit, the oxygen storage calculation enable time is controlled to be set to zero, and the current oxygen storage calculation enable cumulative time is obtained.

[0065] Among them, the weighted oxygen storage time limit is the weighted oxygen storage cumulative time limit for determining whether there is a low efficiency fault of the three-way catalytic converter. The weighted oxygen storage time limit can be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any restrictions on this.

[0066] Cutting off and resuming engine fuel supply are necessary conditions for triggering the three-way catalytic converter efficiency calculation. However, if this condition is triggered continuously without the three-way catalytic converter substrate temperature being high enough, the oxygen storage capacity calculation can easily drop rapidly, leading to a false three-way catalytic converter fault alarm. To address this issue, this embodiment adds a minimum time interval between two consecutive triggering of the oxygen storage capacity calculation enabling condition, namely, setting a cumulative time setting value for the two triggering of the oxygen storage capacity calculation enabling condition.

[0067] Specifically, when the current cumulative oxygen storage calculation enabling time is greater than or equal to the cumulative oxygen storage calculation enabling time setting value, the oxygen storage calculation enabling condition is re-triggered. Similarly, when the current cumulative oxygen storage calculation enabling time is less than the cumulative oxygen storage calculation enabling time setting value, the oxygen storage calculation enabling condition is not triggered and the oxygen storage calculation enabling time continues to be accumulated.

[0068] The calculation enabling cumulative time setting value can be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any limitation on this.

[0069] The technical solution of the embodiment of the present invention is to obtain the initial oxygen storage amount, the current oxygen storage amount, and the current carrier temperature under the condition of triggering the oxygen storage amount calculation enablement, and determine the current oxygen storage amount calculation count corresponding to the current oxygen storage amount when the current oxygen storage amount is greater than a first set oxygen storage amount limit; if the oxygen storage amount difference between the initial oxygen storage amount and the current oxygen storage amount is less than or equal to a second set oxygen storage amount limit, and / or the current oxygen storage amount calculation count is greater than or equal to the set oxygen storage amount calculation count, then obtain a weighted oxygen storage amount value and a weighted oxygen storage amount count; if the weighted oxygen storage amount count is greater than or equal to the weighted oxygen storage amount count limit, determine whether there is a three-way catalytic converter low efficiency fault based on the weighted oxygen storage amount value. The present invention solves the problem that the current three-way catalytic converter efficiency diagnosis is prone to false fault reports in the market and cannot guarantee the accuracy of the three-way catalytic converter efficiency diagnosis, thereby improving the accuracy of the three-way catalytic converter efficiency diagnosis and reducing false fault reports.

[0070] Example 2

[0071] Figure 2 This is a flow chart of a three-way catalytic converter efficiency diagnosis and control method provided in Example 2 of the present invention. This embodiment provides an optional implementation method based on the above embodiment. Figure 2 As shown, the three-way catalytic converter efficiency diagnosis and control method includes:

[0072] S210 : Under the condition that the oxygen storage capacity calculation is triggered and enabled, obtaining the initial oxygen storage capacity, the current oxygen storage capacity, and the current carrier temperature.

[0073] It is known that some vehicles report a low efficiency fault of the three-way catalytic converter after starting for a period of time, but in the subsequent monitoring of the oxygen storage, it is found that the oxygen storage of the three-way catalytic converter has returned to normal levels. At this time, it can be determined that the low efficiency fault of the three-way catalytic converter is a false alarm. Figure 1 and Figure 2 Understandably, the cause of the false alarm may be related to the accuracy of the three-way catalytic converter carrier temperature model and the continuous operating condition change. To improve the robustness of the three-way catalytic converter efficiency diagnosis, an oxygen storage capacity calculation enabling condition is provided, and the three-way catalytic converter low efficiency fault is diagnosed under the triggering oxygen storage capacity calculation enabling condition.

[0074] The enabling conditions for oxygen storage calculation include carrier temperature conditions, engine target continuous running time, and engine operating conditions. The triggering conditions for oxygen storage calculation are met when the carrier temperature meets a certain range, the engine target continuous running time is the minimum continuous running time of the engine after starting based on the ambient temperature correction, and the engine operating conditions meet the corresponding enabling conditions.

[0075] Among them, the target continuous running time of the engine is the minimum continuous running time of the engine after starting the vehicle based on the atmospheric temperature correction in the ambient temperature conditions. The advantage of this setting is to ensure that the three-way catalytic converter carrier is in a sufficiently hot state.

[0076] The engine operating conditions may include, but are not limited to, at least one of an engine speed condition, a water temperature condition, an intake temperature condition, and a reverse running time condition, and this embodiment does not impose any limitation on this.

[0077] S211. Determine whether the current oxygen storage capacity is greater than a first set oxygen storage capacity limit. If so, execute step S212; if not, execute step S213.

[0078] S212: Determine the current oxygen storage calculation times corresponding to the current oxygen storage capacity, and execute step S214.

[0079] S213: Determine that there is an abnormal fault in the three-way catalytic converter.

[0080] S214: Determine whether the difference between the initial oxygen storage capacity and the current oxygen storage capacity is greater than the second set oxygen storage capacity limit, and whether the current oxygen storage capacity calculation times are less than the set oxygen storage capacity calculation times. If so, execute step S215; if not, execute step S219.

[0081] S215 , increasing the current carrier temperature by the set temperature value to obtain the sample carrier temperature, and executing step S216 .

[0082] If the difference between the initial oxygen storage capacity and the current oxygen storage capacity is greater than the second set oxygen storage capacity limit, that is, the calculated oxygen storage capacity is low and exceeds the normal deviation (that is, greater than the second set oxygen storage capacity limit), then when the oxygen storage capacity is calculated next time, the catalyst carrier temperature requirement is increased, that is, the current carrier temperature is increased by the set temperature value to obtain the sample carrier temperature.

[0083] It can be understood that the sample carrier temperature will be used as the new carrier temperature condition, that is, the carrier temperature condition in the oxygen storage calculation enabling condition is updated, and the sample carrier temperature is used as the carrier temperature condition in the oxygen storage calculation enabling condition to determine whether to trigger the oxygen storage calculation enabling condition.

[0084] S216: Determine whether the sample carrier temperature is less than the carrier temperature limit; if so, execute step S217; if not, execute step S218.

[0085] S217 , using the sample carrier temperature as the target carrier temperature, and using the target carrier temperature as the carrier temperature condition, and executing step S210 .

[0086] S218: Use the carrier temperature limit as a carrier temperature condition and execute step S210.

[0087] S219: Obtain the weighted oxygen storage value and the weighted oxygen storage times, and execute step S220.

[0088] Specifically, if the oxygen storage difference between the initial oxygen storage and the current oxygen storage is less than or equal to the second set oxygen storage limit and the number of current oxygen storage calculations is less than the set oxygen storage calculation number, then the weighted oxygen storage value and the weighted oxygen storage number are obtained; or, the oxygen storage difference between the initial oxygen storage and the current oxygen storage is greater than the second set oxygen storage limit and the number of current oxygen storage calculations is greater than or equal to the set oxygen storage calculation number, then the weighted oxygen storage value and the weighted oxygen storage number are obtained; or, the oxygen storage difference between the initial oxygen storage and the current oxygen storage is less than or equal to the second set oxygen storage limit and the number of current oxygen storage calculations is greater than or equal to the set oxygen storage calculation number, then the weighted oxygen storage value and the weighted oxygen storage number are obtained.

[0089] S220: Determine whether the weighted oxygen storage times are greater than or equal to the weighted oxygen storage times limit; if so, execute step S221; if not, execute step S223.

[0090] S221: Determine whether the weighted oxygen storage value is less than the set weighted oxygen storage threshold. If so, execute step S222; if not, execute step S210.

[0091] S222: Determine that a three-way catalytic converter low efficiency fault exists.

[0092] S223: Control the oxygen storage capacity calculation enabling time to be set to zero, obtain the current oxygen storage capacity calculation enabling cumulative time, and execute step S224.

[0093] S224: Determine whether the current oxygen storage capacity calculation enabling cumulative time is greater than or equal to the calculation enabling cumulative time setting value. If so, execute step S210; if not, execute step S223.

[0094] Example 3

[0095] Figure 5 This is a schematic diagram of the structure of a three-way catalytic converter efficiency diagnosis and control device provided in the third embodiment of the present invention. Figure 5 As shown, the three-way catalytic converter efficiency diagnosis and control device includes:

[0096] an oxygen storage capacity calculation times determination module 510 for obtaining, under a condition that an oxygen storage capacity calculation enablement is triggered, an initial oxygen storage capacity, a current oxygen storage capacity, and a current carrier temperature, and determining a current oxygen storage capacity calculation times corresponding to the current oxygen storage capacity when the current oxygen storage capacity is greater than a first set oxygen storage capacity limit;

[0097] a weighted oxygen storage determination module 520 configured to obtain a weighted oxygen storage value and a weighted oxygen storage count if the difference between the initial oxygen storage and the current oxygen storage is less than or equal to a second set oxygen storage limit, and / or the current oxygen storage calculation count is greater than or equal to a set oxygen storage calculation count;

[0098] The fault judgment module 530 is configured to determine whether a three-way catalytic converter low efficiency fault exists according to the weighted oxygen storage value if the weighted oxygen storage number is greater than or equal to the weighted oxygen storage number limit.

[0099] Optionally, the three-way catalytic converter efficiency diagnosis and control device further includes:

[0100] The three-way catalytic converter abnormal fault determination module is configured to determine that a three-way catalytic converter abnormal fault exists if the current oxygen storage amount is less than or equal to a first set oxygen storage amount limit value.

[0101] Optionally, the oxygen storage amount calculation enabling conditions include a carrier temperature condition, an engine target continuous running time, and an engine operating condition, wherein the engine target continuous running time is corrected based on the ambient temperature.

[0102] Optionally, the three-way catalytic converter efficiency diagnosis and control device further includes:

[0103] a sample carrier temperature determination module, configured to increase the current carrier temperature by a set temperature value to obtain the sample carrier temperature if the oxygen storage difference is greater than a second set oxygen storage limit and the current oxygen storage calculation number is less than a set oxygen storage calculation number;

[0104] The carrier temperature condition determination module is configured to determine the carrier temperature condition according to the sample carrier temperature.

[0105] Optionally, the carrier temperature condition determination module is specifically configured to:

[0106] If the sample carrier temperature is less than the carrier temperature limit, the sample carrier temperature is used as the carrier temperature condition;

[0107] If the sample carrier temperature is greater than or equal to the carrier temperature limit, the carrier temperature limit is used as the carrier temperature condition.

[0108] Optionally, the fault judgment module 530 is specifically configured to:

[0109] If the weighted oxygen storage value is less than the set weighted oxygen storage threshold, it is determined that a three-way catalytic converter low efficiency fault exists.

[0110] Optionally, the three-way catalytic converter efficiency diagnosis and control device further includes:

[0111] a time accumulation module, configured to control the oxygen storage calculation enabling time to be reset to zero if the weighted oxygen storage number of times is less than the weighted oxygen storage number of times limit, and obtain the current oxygen storage calculation enabling cumulative time;

[0112] The re-triggering condition module is used to execute re-triggering of the oxygen storage amount calculation enabling condition when the current oxygen storage amount calculation enabling cumulative time is greater than or equal to the calculation enabling cumulative time setting value.

[0113] The three-way catalytic converter efficiency diagnosis and control device provided in the embodiment of the present invention can execute the three-way catalytic converter efficiency diagnosis and control method provided in any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the three-way catalytic converter efficiency diagnosis and control method.

[0114] Example 4

[0115] Figure 6 A schematic diagram of a vehicle 610 that can be used to implement an embodiment of the present invention is shown. The vehicle is intended to include various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The vehicle may also include various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0116] like Figure 6 As shown, the vehicle 610 includes at least one processor 611 and a memory, such as a read-only memory (ROM) 612, a random access memory (RAM) 613, etc., which is communicatively connected to the at least one processor 611. The memory stores a computer program that can be executed by the at least one processor, and the processor 611 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 612 or the computer program loaded from the storage unit 618 to the random access memory (RAM) 613. Various programs and data required for the operation of the vehicle 610 can also be stored in the RAM 613. The processor 611, ROM 612, and RAM 613 are connected to each other via a bus 614. An input / output (I / O) interface 615 is also connected to the bus 614.

[0117] Various components in the vehicle 610 are connected to the I / O interface 615, including an input unit 616, such as a keyboard, mouse, etc.; an output unit 617, such as various types of displays, speakers, etc.; a storage unit 618, such as a magnetic disk, optical disk, etc.; and a communication unit 619, such as a network card, modem, wireless communication transceiver, etc. The communication unit 619 allows the vehicle 610 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0118] The processor 611 can be a variety of general-purpose and / or specialized processing components with processing and computing capabilities. Some examples of the processor 611 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors that run machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 611 executes the various methods and processes described above, such as the three-way catalytic converter efficiency diagnosis and control method.

[0119] In some embodiments, the three-way catalytic converter efficiency diagnostic control method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 618. In some embodiments, part or all of the computer program can be loaded and / or installed on the vehicle 610 via the ROM 612 and / or the communication unit 619. When the computer program is loaded into the RAM 613 and executed by the processor 611, one or more steps of the three-way catalytic converter efficiency diagnostic control method described above can be performed. Alternatively, in other embodiments, the processor 611 can be configured to execute the three-way catalytic converter efficiency diagnostic control method in any other appropriate manner (e.g., by means of firmware).

[0120] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0121] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0122] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0123] To provide interaction with a user, the systems and techniques described herein can be implemented in a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0124] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0125] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0126] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0127] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A three-way catalytic converter efficiency diagnosis and control method, characterized in that: include: Under the condition that the oxygen storage calculation is enabled, obtaining the initial oxygen storage capacity, the current oxygen storage capacity, and the current carrier temperature, and determining the current oxygen storage calculation number corresponding to the current oxygen storage capacity when the current oxygen storage capacity is greater than a first set oxygen storage capacity limit; If the current oxygen storage amount is less than or equal to the first set oxygen storage amount limit, it is determined that there is an abnormal fault in the three-way catalytic converter; If the oxygen storage difference between the initial oxygen storage capacity and the current oxygen storage capacity is less than or equal to a second set oxygen storage capacity limit, and / or the current oxygen storage capacity calculation number is greater than or equal to a set oxygen storage capacity calculation number, then obtaining a weighted oxygen storage capacity value and a weighted oxygen storage capacity number; If the oxygen storage difference is greater than a second set oxygen storage limit, and the current oxygen storage calculation number is less than the set oxygen storage calculation number, increasing the current carrier temperature by the set temperature value to obtain a sample carrier temperature; and determining a carrier temperature condition based on the sample carrier temperature; If the weighted oxygen storage number is greater than or equal to the weighted oxygen storage number limit, determining whether there is a three-way catalytic converter low efficiency fault based on the weighted oxygen storage value; Wherein, determining whether a three-way catalytic converter low efficiency fault exists according to the weighted oxygen storage value includes: if the weighted oxygen storage value is less than a set weighted oxygen storage threshold, determining that a three-way catalytic converter low efficiency fault exists; If the weighted oxygen storage number of times is less than the weighted oxygen storage number limit, the oxygen storage calculation enabling time is controlled to be zero, and the current oxygen storage calculation enabling cumulative time is obtained; When the current oxygen storage capacity calculation enabling cumulative time is greater than or equal to the calculation enabling cumulative time setting value, the oxygen storage capacity calculation enabling condition is re-triggered.

2. The three-way catalytic converter efficiency diagnosis and control method according to claim 1, characterized in that: The oxygen storage amount calculation enabling condition includes a carrier temperature condition, an engine target continuous operation time, and an engine operation condition, wherein the engine target continuous operation time is corrected based on the ambient temperature.

3. The three-way catalytic converter efficiency diagnosis and control method according to claim 2, characterized in that: Determining a carrier temperature condition according to the sample carrier temperature includes: If the sample carrier temperature is less than the carrier temperature limit, the sample carrier temperature is used as the carrier temperature condition; If the sample carrier temperature is greater than or equal to the carrier temperature limit, the carrier temperature limit is used as the carrier temperature condition.

4. A three-way catalytic converter efficiency diagnosis and control device, characterized in that: include: an oxygen storage amount calculation times determination module, configured to obtain the initial oxygen storage amount, the current oxygen storage amount, and the current carrier temperature under the condition that the oxygen storage amount calculation is triggered, and determine the current oxygen storage amount calculation times corresponding to the current oxygen storage amount when the current oxygen storage amount is greater than a first set oxygen storage amount limit; a three-way catalytic converter abnormal fault determination module, configured to determine that a three-way catalytic converter abnormal fault exists if the current oxygen storage amount is less than or equal to a first set oxygen storage amount limit; a weighted oxygen storage determination module, configured to obtain a weighted oxygen storage value and a weighted oxygen storage count if a difference between the initial oxygen storage and the current oxygen storage is less than or equal to a second set oxygen storage limit, and / or if the current oxygen storage calculation count is greater than or equal to a set oxygen storage calculation count; a sample carrier temperature determination module, configured to increase the current carrier temperature by a set temperature value to obtain the sample carrier temperature if the oxygen storage difference is greater than a second set oxygen storage limit and the current oxygen storage calculation number is less than a set oxygen storage calculation number; a carrier temperature condition determination module, configured to determine a carrier temperature condition according to the sample carrier temperature; a fault judgment module, configured to determine whether a three-way catalytic converter low efficiency fault exists according to the weighted oxygen storage value if the weighted oxygen storage number is greater than or equal to a weighted oxygen storage number limit; The fault judgment module is specifically configured to: determine that a three-way catalytic converter low efficiency fault exists if the weighted oxygen storage value is less than a set weighted oxygen storage threshold; a time accumulation module, configured to control the oxygen storage calculation enabling time to be reset to zero if the weighted oxygen storage number of times is less than the weighted oxygen storage number of times limit, and obtain the current oxygen storage calculation enabling cumulative time; The re-triggering condition module is used to execute re-triggering of the oxygen storage amount calculation enabling condition when the current oxygen storage amount calculation enabling cumulative time is greater than or equal to the calculation enabling cumulative time setting value.

5. A vehicle, characterized in that: The vehicle comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the three-way catalytic converter efficiency diagnosis and control method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the three-way catalytic converter efficiency diagnosis and control method according to any one of claims 1 to 3 when executed.

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