Method and device for diagnosing conversion efficiency of three-way catalyst, medium and equipment

Abstract

The invention provides a conversion efficiency diagnosis method and device for a three-way catalyst, a medium and equipment. The method comprises the steps that the running state of a target vehicle is determined; if the running state is a sliding state, calculating sliding accumulation parameters; if the sliding accumulation parameter meets the preset condition, the circulating oxygen storage amount within the first time when the target vehicle exits from the sliding state to the second time when oxygen release is completed is calculated, so that the conversion efficiency of a three-way catalyst of the target vehicle is determined; the operation state of the target vehicle is determined according to the operation state parameters in the operation process of the target vehicle, if the target vehicle is in the sliding state, the sliding accumulation parameters are calculated, and the circulation oxygen storage amount is calculated after the preset conditions are met so as to determine the conversion efficiency of the three-way catalyst of the target vehicle. Therefore, the oxygen storage amount of the target vehicle in the circulation process from oxygen storage to oxygen release can be accurately calculated, then the conversion efficiency of the three-way catalyst is accurately calculated, and the degradation degree of the three-way catalyst of the target vehicle is evaluated more accurately.

Description

Technical Field

[0001] This application relates to the technical field of monitoring the conversion efficiency of a three-way catalytic converter, and particularly relates to a method, device, medium and equipment for diagnosing the conversion efficiency of a three-way catalytic converter. Background Art

[0002] A three-way catalytic converter is the most important off-board purification device installed in an automobile exhaust system. The three-way catalytic converter can convert harmful gases such as CO, HC, and NO in the automobile exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. If the three-way catalyst fails or its conversion efficiency decreases, it will have a great impact on the emission operation of the automobile. X At present, the judgment of the conversion efficiency of the three-way catalytic converter is mostly determined by calculating the oxygen storage amount. However, the conditions for calculating the oxygen storage amount are incomplete, resulting in inaccurate calculation of the oxygen storage amount during actual application, and thus inaccurate fault judgment of the three-way catalytic converter. Therefore, a solution that can accurately estimate the conversion efficiency of the three-way catalytic converter is needed.

[0003] Currently, the determination of the conversion efficiency of the three-way catalytic converter is mostly based on the calculation of the oxygen storage amount. However, the conditions for calculating the oxygen storage amount are incomplete, resulting in inaccurate calculation of the oxygen storage amount during actual application, and thus inaccurate fault judgment of the three-way catalytic converter. Therefore, a solution that can accurately estimate the conversion efficiency of the three-way catalytic converter is required. Summary of the Invention

[0004] To solve the above technical problems, this application is proposed. Embodiments of this application provide a method, device, medium and equipment for diagnosing the conversion efficiency of a three-way catalytic converter.

[0005] According to one aspect of this application, a method for diagnosing the conversion efficiency of a three-way catalytic converter is provided, including: obtaining the operating state parameters of a target vehicle; determining the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, calculating the coasting cumulative parameters of the target vehicle; wherein the coasting cumulative parameters represent the cumulative value of the characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameters meet a preset condition, calculating the cyclic oxygen storage amount within the second time from the first time when the target vehicle exits the coasting state to the time when the three-way catalytic converter completes oxygen release; and determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount.

[0006] In one embodiment, the operating state parameters include the vehicle speed and engine speed of the target vehicle; wherein, determining the operating state of the target vehicle based on the operating state parameters includes: if the vehicle speed is zero or continuously decreasing and the engine speed is greater than or equal to the idle speed, determining that the operating state of the target vehicle is a coasting state.

[0007] In one embodiment, calculating the coasting cumulative parameters of the target vehicle includes: calculating the coasting duration and the maximum value of the excess air coefficient of the target vehicle in the coasting state.

[0008] In one embodiment, calculating the cyclic oxygen storage amount within the second time when the three-way catalytic converter finishes oxygen release from the first time when the target vehicle exits the coasting state if the coasting cumulative parameter meets a preset condition includes: calculating the cyclic oxygen storage amount if the coasting duration is greater than a preset duration threshold and the maximum value of the excess air ratio is greater than a preset value.

[0009] In one embodiment, calculating the cyclic oxygen storage amount within the second time when the three-way catalytic converter finishes oxygen release from the first time when the target vehicle exits the coasting state includes: calculating the cyclic oxygen storage amount based on the excess air ratio and the engine intake air flow rate of the target vehicle during the period from the first time to the second time.

[0010] In one embodiment, calculating the cyclic oxygen storage amount based on the excess air ratio and the engine intake air flow rate of the target vehicle during the period from the first time to the second time includes: the calculation formula for the cyclic oxygen storage amount is: ; where OSC is the cyclic oxygen storage amount of the target vehicle, λ is the excess air ratio measured by the upstream oxygen sensor, Q is the intake air flow rate of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter finishes oxygen release.

[0011] In one embodiment, determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount includes: determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount and the maximum oxygen storage amount of the target vehicle.

[0012] According to another aspect of the present application, there is provided a diagnostic device for the conversion efficiency of a three-way catalytic converter, including: an operating parameter acquisition module for acquiring the operating state parameters of a target vehicle; an operating state determination module for determining the operating state of the target vehicle based on the operating state parameters; a coasting parameter calculation module for calculating the coasting cumulative parameter of the target vehicle if the operating state of the target vehicle is a coasting state; where the coasting cumulative parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state; an oxygen storage amount calculation module for calculating the cyclic oxygen storage amount within the second time when the three-way catalytic converter finishes oxygen release from the first time when the target vehicle exits the coasting state if the coasting cumulative parameter meets a preset condition; and a conversion efficiency determination module for determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount.

[0013] According to another aspect of the present application, there is provided a computer-readable storage medium storing a computer program for executing any of the above methods.

[0014] According to another aspect of the present application, there is provided an electronic device, comprising: a processor; a memory for storing executable instructions of the processor; the processor is configured to execute any of the above methods.

[0015] A method, apparatus, medium and device for diagnosing the conversion efficiency of a three-way catalytic converter provided by the present application, by obtaining the operating state parameters of a target vehicle; determining the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, calculating the coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameter meets a preset condition, calculating the cyclic oxygen storage amount within the second time from when the target vehicle exits the coasting state to when the three-way catalytic converter completes oxygen release; determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount; that is, determining the operating state of the target vehicle according to its operating state parameters during the operation of the target vehicle, if the target vehicle is in the coasting state, calculating the coasting cumulative parameter, and calculating the cyclic oxygen storage amount after meeting the preset condition to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so as to accurately calculate the oxygen storage amount of the target vehicle in a single oxygen storage to oxygen release cycle process, and then accurately calculate the conversion efficiency of the three-way catalytic converter to more accurately evaluate the three-way catalytic converter of the target vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 is a schematic flowchart of a method for diagnosing the conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0018] Figure 2 is a schematic structural diagram of an example of a method for diagnosing the conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0019] Figure 3 is a schematic structural diagram of a device for diagnosing the conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0020] Figure 4It is a structural diagram of an electronic device provided by an exemplary embodiment of the present application. Detailed implementation manners

[0021] Next, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0022] Figure 1 It is a schematic flow chart of a method for diagnosing the conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application. As Figure 1 shown, the method for diagnosing the conversion efficiency of the three-way catalytic converter includes the following steps: Step 110: Obtain the operating state parameters of the target vehicle.

[0023] The present application obtains the operating state parameters of the target vehicle in real time through a remote platform, including relevant data collected by sensors installed on the target vehicle, such as vehicle speed, engine speed, engine intake air volume, engine fuel flow rate, output values of oxygen sensors upstream and downstream of the three-way catalytic converter, etc. Among them, the oxygen sensor is an important component of the three-way catalytic converter system. Generally, one is arranged upstream and downstream of the three-way catalytic converter respectively. There are two common types of oxygen sensors, namely the wide-range oxygen sensor and the switching-type oxygen sensor. Their output characteristic curves are different. The wide-range oxygen sensor is generally installed upstream of the three-way catalytic converter to monitor the oxygen content in the exhaust gas before entering the three-way catalytic converter and output the excess air coefficient value, which is mainly used for stoichiometric ratio combustion control. The switching-type oxygen sensor is installed downstream of the three-way catalytic converter to monitor the oxygen content in the exhaust gas after being treated by the three-way catalytic converter and output a voltage signal. When the oxygen content in the exhaust gas is near the stoichiometric ratio, the voltage output signal jumps, which is mainly used to assist in calculating the oxygen storage capacity of the three-way catalytic converter.

[0024] Step 120: Determine the operating state of the target vehicle based on the operating state parameters.

[0025] After the present application obtains the operating state parameters of the target vehicle, it judges the operating state of the target vehicle based on the real-time operating state parameters of the target vehicle, that is, determines which operating state the target vehicle is currently in according to the operating state parameters of the target vehicle, such as the driving state, the coasting state, etc.

[0026] Step 130: If the operating state of the target vehicle is the coasting state, calculate the coasting cumulative parameters of the target vehicle.

[0027] Among them, the cumulative coasting parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state. When this application determines that the target vehicle is in the coasting state (at this time, the engine speed is relatively low and the engine fuel flow is relatively small), it calculates the cumulative coasting parameter of the target vehicle in the current coasting state to determine the oxygen storage situation of the target vehicle in the current coasting state (since the intake air volume of the target vehicle is greater than the fuel injection volume in the coasting state, the air-fuel ratio in the exhaust gas is relatively large, and at this time, the three-way catalytic converter is in the oxygen storage process).

[0028] Step 140: If the cumulative coasting parameter meets the preset condition, calculate the cyclic oxygen storage amount within the second time from the first time when the target vehicle exits the coasting state to when the three-way catalytic converter completes oxygen release.

[0029] If the target vehicle meets the preset condition (i.e., oxygen storage is completed) during the current coasting, calculate the cyclic oxygen storage amount within the second time from the first time when the target vehicle exits the coasting state (the engine resumes fuel supply) to when oxygen release is completed (as Figure 2 shown), that is, calculate the oxygen release amount during the process from the completion of one oxygen storage to the completion of oxygen release of the target vehicle (i.e., the maximum oxygen storage amount that the three-way catalytic converter may reach) to determine the conversion efficiency of the three-way catalytic converter.

[0030] Step 150: Based on the cyclic oxygen storage amount, determine the conversion efficiency of the three-way catalytic converter of the target vehicle.

[0031] Since the conversion amount of the three-way catalytic converter is positively correlated with the amount of oxygen it can store, therefore, using the oxygen storage amount as an indicator to measure the conversion efficiency of the three-way catalytic converter can accurately reflect the conversion efficiency of the three-way catalytic converter. After this application calculates the oxygen release amount during the process from the completion of one oxygen storage to the completion of oxygen release of the target vehicle, it diagnoses the conversion efficiency of the three-way catalytic converter of the target vehicle based on this oxygen release amount to ensure the diagnostic accuracy rate.

[0032] A method for diagnosing the conversion efficiency of a three-way catalytic converter provided by this application obtains the operating state parameters of a target vehicle; determines the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, calculates the coasting cumulative parameter of the target vehicle; wherein, the coasting cumulative parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameter meets the preset condition, calculates the cyclic oxygen storage amount within the second time from the first time when the target vehicle exits the coasting state to when the three-way catalytic converter completes oxygen release; determines the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount; that is, during the operation of the target vehicle, its operating state is determined according to its operating state parameters. If the target vehicle is in the coasting state, the coasting cumulative parameter is calculated, and after meeting the preset condition, the cyclic oxygen storage amount is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so that the oxygen storage amount of the target vehicle during an oxygen storage to oxygen release cycle process can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated to more accurately evaluate the three-way catalytic converter of the target vehicle. And through remote monitoring, remote emission monitoring of vehicles (especially heavy vehicles) can be realized to remotely and real-time identify over-emitting vehicles, thereby improving the environmental protection supervision intensity and effect.

[0033] In one embodiment, the operating state parameters include the vehicle speed and engine speed of the target vehicle; wherein, the specific implementation manner of the above step 120 can be: if the vehicle speed is zero or continuously decreasing, and the engine speed is greater than or equal to the idle speed, then determine that the operating state of the target vehicle is the coasting state.

[0034] This application determines whether the target vehicle is in the coasting state by the vehicle speed and engine speed of the target vehicle. When the vehicle speed is zero (i.e., idling at a stop) or continuously decreasing (the vehicle speed is in a downward state, i.e., free coasting or braking coasting), and the engine speed is greater than or equal to the idle speed (and the difference between the engine speed and the idle speed is less than the preset speed difference), then it can be determined that the operating state of the target vehicle is the coasting state (as Figure 2 shown), and at this time the target vehicle is in the oxygen storage process.

[0035] In one embodiment, the specific implementation manner of the above step 130 can be: calculate the coasting duration and the maximum value of the excess air coefficient of the target vehicle in the coasting state.

[0036] When it is determined that the target vehicle is in the oxygen storage process, it is determined whether the oxygen storage of the target vehicle is completed by judging the cumulative parameters during the oxygen storage process of the target vehicle. Specifically, this application calculates the coasting duration (the duration of the oxygen storage process) and the maximum value (or cumulative value, which increases as the oxygen storage amount continuously increases) of the excess air coefficient of the target vehicle in the coasting state, and determines whether the oxygen storage process of the target vehicle is completed based on the coasting duration and the maximum value of the excess air coefficient.

[0037] In one embodiment, the specific implementation of step 140 may be: if the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value, calculate the cyclic oxygen storage amount.

[0038] If the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value, for example, the coasting duration is greater than 60 seconds and the maximum value of the excess air coefficient is greater than 1.05, that is, (the maximum value of the excess air coefficient - 1) > 0.05, it is determined that the oxygen storage process of the target vehicle is completed. At this time, the oxygen storage amount of the target vehicle (i.e., the oxygen release amount after oxygen storage is completed) can be calculated.

[0039] Optionally, if there is no coasting state that meets the preset conditions during the current driving process of the target vehicle, a fixed time frame can be used to move on the curve of the operating state parameters of the target vehicle during the current time (such as the vehicle speed curve) to intercept multiple segments of the curve, and calculate the proportion of the coasting state within each segment of the curve. If there is a curve with a proportion greater than a preset proportion threshold, it indicates that the target vehicle has basically completed oxygen storage during this time period. Then, select the curve corresponding to the maximum proportion as the target curve, and use the end point of the last coasting state curve in the target curve as the above-mentioned first time to calculate the conversion efficiency of the three-way catalytic converter during the current driving process of the target vehicle.

[0040] In one embodiment, the specific implementation of step 140 may be: calculate the cyclic oxygen storage amount based on the excess air coefficient and the engine intake air flow of the target vehicle from the first time to the second time.

[0041] After determining that the target vehicle has completed oxygen storage, when the target vehicle exits the coasting state and enters the driving state (i.e., the engine resumes fuel supply), it is recorded as the first time, and when the three-way catalytic converter finishes oxygen release, it is recorded as the second time (specifically, it can be determined by the output value of the oxygen sensor downstream of the three-way catalytic converter. When the output value of the oxygen sensor downstream of the three-way catalytic converter jumps from a low voltage signal to a high voltage signal, the three-way catalytic converter finishes oxygen release). In this application, the cyclic oxygen storage amount is calculated based on the excess air coefficient and the engine intake air flow of the target vehicle from the first time to the second time.

[0042] In one embodiment, the specific implementation of step 140 may be: the calculation formula for the cyclic oxygen storage amount is: ; where OSC is the cyclic oxygen storage amount of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter completes oxygen release.

[0043] In this application, the intake air flow rate and the integral of the excess air coefficient of the engine with respect to time during the entire oxygen release process of the target vehicle are calculated to determine the actual oxygen release amount during the oxygen release process, that is, to determine the oxygen storage amount of the three-way catalytic converter of the target vehicle (as Figure 2 shown).

[0044] In one embodiment, the specific implementation manner of the above step 150 may be: based on the cyclic oxygen storage amount and the maximum oxygen storage amount of the target vehicle, determine the conversion efficiency of the three-way catalytic converter of the target vehicle.

[0045] After calculating the cyclic oxygen storage amount of the target vehicle, combine the maximum oxygen storage amount of the new three-way catalytic converter of the target vehicle OSC max (which can be pre-measured and calibrated). If the cyclic oxygen storage amount of the three-way catalytic converter of the target vehicle OSC<kOSC max , then it is determined that the conversion efficiency of the three-way catalytic converter of the target vehicle is low, and the target vehicle has a risk of excessive emissions. Otherwise, it is determined that the conversion efficiency of the three-way catalytic converter of the target vehicle is high, and the target vehicle has no risk of excessive emissions. Among them, k The value range of is 0 to 1. For example k = 0.5.

[0046] Figure 3 is a schematic structural diagram of a three-way catalytic converter conversion efficiency diagnostic device provided by an exemplary embodiment of this application. As Figure 3 shown, the three-way catalytic converter conversion efficiency diagnostic device 30 includes: an operating parameter acquisition module 31 for acquiring the operating state parameters of the target vehicle; an operating state determination module 32 for determining the operating state of the target vehicle based on the operating state parameters; a coasting parameter calculation module 33 for calculating the cumulative coasting parameters of the target vehicle if the operating state of the target vehicle is a coasting state; where the cumulative coasting parameters represent the cumulative value of the characteristic parameters of the target vehicle in the coasting state; an oxygen storage amount calculation module 34 for calculating the cyclic oxygen storage amount of the target vehicle from the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release if the cumulative coasting parameters meet a preset condition; a conversion efficiency determination module 35 for determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount.

[0047] A conversion efficiency diagnosis device for a three-way catalytic converter provided by the present application obtains the operating state parameters of a target vehicle through an operating parameter acquisition module 31; an operating state determination module 32 determines the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, a coasting parameter calculation module 33 calculates the coasting cumulative parameter of the target vehicle; wherein, the coasting cumulative parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameter meets a preset condition, an oxygen storage amount calculation module 34 calculates the cyclic oxygen storage amount within the second time from the first time when the target vehicle exits the coasting state to when the three-way catalytic converter completes oxygen release; a conversion efficiency determination module 35 determines the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount; that is, during the operation of the target vehicle, its operating state is determined according to its operating state parameters. If the target vehicle is in the coasting state, the coasting cumulative parameter is calculated, and after meeting the preset condition, the cyclic oxygen storage amount is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so that the oxygen storage amount of the target vehicle during an oxygen storage to oxygen release cycle process can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated to more accurately evaluate the three-way catalytic converter of the target vehicle.

[0048] In one embodiment, the operating state parameters include the vehicle speed and engine speed of the target vehicle; wherein, the above-mentioned operating state determination module 32 can be further configured as: if the vehicle speed is zero or continuously decreasing and the engine speed is greater than or equal to the idle speed, it is determined that the operating state of the target vehicle is the coasting state.

[0049] In one embodiment, the above-mentioned coasting parameter calculation module 33 can be further configured as: calculating the coasting duration and the maximum value of the excess air coefficient of the target vehicle in the coasting state.

[0050] In one embodiment, the above-mentioned oxygen storage amount calculation module 34 can be further configured as: if the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value, calculate the cyclic oxygen storage amount.

[0051] In one embodiment, the above-mentioned oxygen storage amount calculation module 34 can be further configured as: calculating the cyclic oxygen storage amount based on the excess air coefficient and the engine intake air flow of the target vehicle within the first time to the second time.

[0052] In one embodiment, the above-mentioned oxygen storage amount calculation module 34 can be further configured as: the calculation formula for the cyclic oxygen storage amount is: ; wherein, OSC is the cyclic oxygen storage amount of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t2 is the second time when the three-way catalytic converter completes oxygen release.

[0053] In one embodiment, the conversion efficiency determination module 35 can be further configured to: determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the cyclic oxygen storage amount and the maximum oxygen storage amount of the target vehicle.

[0054] Next, refer to Figure 4 to describe the electronic device according to an embodiment of the present application. The electronic device can be any one or both of the first device and the second device, or a stand-alone device independent of them, and the stand-alone device can communicate with the first device and the second device to receive the input signals collected from them.

[0055] Figure 4 The block diagram of the electronic device according to an embodiment of the present application is illustrated.

[0056] As Figure 4 shown, the electronic device 10 includes one or more processors 11 and a memory 12.

[0057] The processor 11 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device 10 to perform desired functions.

[0058] The memory 12 can include one or more computer program products, and the computer program products can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory can include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions can be stored on the computer-readable storage medium, and the processor 11 can run the program instructions to implement the methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. can also be stored in the computer-readable storage medium.

[0059] In one example, the electronic device 10 can further include: an input device 13 and an output device 14, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0060] When the electronic device is a stand-alone device, the input device 13 can be a communication network connector for receiving the input signals collected from the first device and the second device.

[0061] In addition, the input device 13 can further include, for example, a keyboard, a mouse, etc.

[0062] The output device 14 can output various information to the outside, including the determined distance information, direction information, etc. The output device 14 can include, for example, a display, a speaker, a printer, a communication network, and remote output devices connected thereto, etc.

[0063] Of course, for the sake of simplicity, Figure 4 only some of the components related to this application in the electronic device 10 are shown in, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application scenarios, the electronic device 10 may further include any other appropriate components.

[0064] In addition to the above methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions that, when run by a processor, cause the processor to execute the steps in the methods according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0065] The computer program product can be written in any combination of one or more programming languages for programming code to perform the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0066] In addition, an embodiment of the present application may also be a computer-readable storage medium, on which computer program instructions are stored, and the computer program instructions, when run by a processor, cause the processor to execute the steps in the methods according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0067] The computer-readable storage medium may adopt any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0068] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. Additionally, the specific details disclosed above are only for illustrative and easy-to-understand purposes and not limitations. These details do not limit the present application to necessarily implementing with the above specific details.

[0069] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms meaning "including but not limited to" and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0070] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0071] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0072] The above description has been given for purposes of illustration and description. Additionally, this description does not intend to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A method for diagnosing the conversion efficiency of a three-way catalytic converter, characterized in that: include: Obtaining the operating status parameters of the target vehicle; Based on the operating state parameter, determining the operating state of the target vehicle; If the running state of the target vehicle is a coasting state, calculating a coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents a cumulative value of a characteristic parameter of the target vehicle in the coasting state; If the coasting cumulative parameter meets the preset condition, the circulating oxygen storage amount during the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release is calculated; Based on the circulating oxygen storage amount, a conversion efficiency of a three-way catalytic converter of the target vehicle is determined.

2. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: The operating state parameters include the vehicle speed and engine speed of the target vehicle; wherein, based on the operating state parameters, determining the operating state of the target vehicle includes: If the vehicle speed is zero or continues to decrease, and the engine speed is greater than or equal to the idle speed, it is determined that the running state of the target vehicle is a coasting state.

3. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: The calculating of the coasting cumulative parameter of the target vehicle comprises: The gliding time duration and the maximum value of the excess air coefficient of the target vehicle in the gliding state are calculated.

4. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 3, characterized in that: If the coasting cumulative parameter satisfies a preset condition, calculating the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release includes: If the coasting time is greater than a preset time threshold and the maximum value of the excess air coefficient is greater than a preset value, the circulating oxygen storage amount is calculated.

5. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: The calculating of the circulating oxygen storage amount during the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release comprises: The circulating oxygen storage amount is calculated based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time.

6. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 5, characterized in that: The calculating the circulating oxygen storage amount based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time includes: The calculation formula of the circulating oxygen storage capacity is: ； in, OSC is the circulating oxygen storage capacity of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow rate of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter completes oxygen release.

7. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: Determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount includes: Based on the circulating oxygen storage amount and the maximum oxygen storage amount of the target vehicle, a conversion efficiency of a three-way catalytic converter of the target vehicle is determined.

8. A conversion efficiency diagnostic device for a three-way catalytic converter, characterized in that: include: An operating parameter acquisition module is used to obtain operating status parameters of the target vehicle; An operating state determination module, used to determine the operating state of the target vehicle based on the operating state parameter; A glide parameter calculation module, used for calculating a glide cumulative parameter of the target vehicle if the running state of the target vehicle is a glide state; wherein the glide cumulative parameter represents a cumulative value of a characteristic parameter of the target vehicle in the glide state; an oxygen storage calculation module, for calculating the circulating oxygen storage amount during a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release if the coasting cumulative parameter satisfies a preset condition; The conversion efficiency determination module is used to determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is used to execute the method described in any one of claims 1 to 7.

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