Oxygen storage capacity detection method and device, electronic equipment, storage medium and program product

Abstract

The embodiment of the invention provides an oxygen storage capacity detection method and device, electronic equipment, a storage medium and a program product. The method comprises the steps that in a preset first time period, the starting time step when a catalytic converter of an engine starts to store oxygen and the ending time step when the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold value are obtained, and the starting time step is earlier than the ending time step; detecting air coefficient deviation information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter in a second time period from the starting time step to the ending time step; and detecting the oxygen storage amount of the catalytic converter according to the preset oxygen storage amount detection template information, the starting time step, the ending time step and the air coefficient deviation information. The method is used for achieving the effect of efficiently detecting the oxygen storage amount of the catalyst.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic detection, in particular to an oxygen storage amount detection method and device, an electronic device, a storage medium and a program product. BACKGROUND

[0002] As an important quantitative index of a catalytic converter, the oxygen storage amount is of great significance to the determination and diagnosis of critical catalytic converters and aged catalytic converters, and therefore, it is particularly important to detect the oxygen storage amount of a catalytic converter.

[0003] At present, the method for detecting the oxygen storage amount of a catalytic converter includes detecting the oxygen storage amount of the catalytic converter on a special test bench. Specifically, on the special test bench, a core sample of the catalytic converter of a vehicle engine is loaded into a reaction tube, and after the reaction tube is heated to a target temperature, the lean combustion condition and the rich combustion condition are simulated alternately, and at the same time, the oxygen concentration changes at the inlet and outlet of the catalytic converter are monitored to calculate the oxygen storage amount of the catalytic converter.

[0004] However, the current method for detecting the oxygen storage amount still cannot efficiently detect the oxygen storage amount of a catalytic converter. SUMMARY

[0005] The embodiments of the present application provide an oxygen storage amount detection method and device, an electronic device, a storage medium and a program product to efficiently detect the oxygen storage amount of a catalytic converter.

[0006] In a first aspect, the embodiments of the present application provide an oxygen storage amount detection method, comprising:

[0007] obtaining a start time step at which the catalytic converter of the engine starts to store oxygen and an end time step at which the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold in a preset first time period, wherein the start time step is earlier than the end time step;

[0008] detecting air coefficient offset information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter in a second time period from the start time step to the end time step;

[0009] detecting the oxygen storage amount of the catalytic converter according to the preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information.

[0010] In a possible implementation, the start time step at which the catalytic converter of the engine starts to store oxygen is obtained, comprising:

[0011] monitoring a first air-fuel ratio of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter by using a front oxygen sensor at the inlet of the catalytic converter of the engine;

[0012] detecting a first excess air coefficient of the engine exhaust before entering the catalyst according to the first air-fuel ratio and the preset theoretical air-fuel ratio;

[0013] obtaining a first time step when the first excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient, and determining the first time step as the start time step of the oxygen storage of the catalyst.

[0014] In a possible implementation, the air coefficient offset information of the engine exhaust before entering the catalyst in a second time period from the start time step to the end time step includes:

[0015] detecting the air coefficient offset information of the engine exhaust before entering the catalyst according to the first excess air coefficient and the preset standard air coefficient.

[0016] In a possible implementation, the end time step when the oxygen storage of the catalyst exceeds the preset oxygen storage threshold includes:

[0017] monitoring a second air-fuel ratio of the engine exhaust after entering the catalyst by using a rear-end oxygen sensor at the outlet of the catalyst;

[0018] detecting a second excess air coefficient of the engine exhaust after entering the catalyst according to the second air-fuel ratio;

[0019] obtaining a second time step when the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient, and determining the second time step as the end time step when the oxygen storage of the catalyst exceeds the preset oxygen storage threshold.

[0020] In a possible implementation, the preset oxygen storage detection template information at least includes an air flow of the engine and an oxygen storage detection model, and the oxygen storage detection model is used to represent a mapping relationship between the oxygen storage of the catalyst, the air flow, the start time step, the end time step and the air coefficient offset information;

[0021] detecting the oxygen storage of the catalyst according to the preset oxygen storage detection template information, the start time step, the end time step and the air coefficient offset information, includes:

[0022] According to the oxygen storage detection model, the air coefficient offset information and the air flow of the engine are time-integrated in the second time period from the start time step to the end time step to obtain the oxygen storage of the catalyst.

[0023] In a possible implementation, the oxygen storage detection method further includes:

[0024] During traveling of the target vehicle on the hub, an engine control unit that controls the engine adjusts an actual air-fuel ratio of a mixture in a cylinder of the engine;

[0025] According to the adjusted actual air-fuel ratio, a state of the engine is switched between a rich state and a lean state.

[0026] In a second aspect, an embodiment of the present application provides an oxygen storage amount detection device, comprising:

[0027] An oxygen storage time period determination module is configured to obtain a start time step at which a catalytic converter of the engine starts to store oxygen and an end time step at which an oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold within a preset first time period, wherein the start time step is earlier than the end time step;

[0028] An air-fuel ratio offset determination module is configured to detect air coefficient offset information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter within a second time period from the start time step to the end time step;

[0029] An oxygen storage amount detection module is configured to detect the oxygen storage amount of the catalytic converter according to preset oxygen storage amount detection template information, the start time step, the end time step, and the air coefficient offset information.

[0030] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory and a processor.

[0031] The memory stores computer execution instructions.

[0032] The processor executes the computer execution instructions stored in the memory, so that the processor executes the first aspect and / or various possible implementation manners of the first aspect.

[0033] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to implement the first aspect and / or various possible implementation manners of the first aspect.

[0034] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program, and the computer program is executed by the processor to implement the first aspect and / or various possible implementation manners of the first aspect.

[0035] The oxygen storage amount detection method, device, electronic equipment, storage medium and program product provided by the embodiments of the present application first acquire a start time step at which the catalyst of the engine starts to store oxygen and an end time step at which the oxygen storage amount of the catalyst exceeds a preset oxygen storage amount threshold in a preset first time period, wherein the start time step is earlier than the end time step, and detect air coefficient offset information when the engine exhaust of the engine does not enter the catalyst in a second time period from the start time step to the end time step; after the above data is collected, the start time step, the end time step and the air coefficient offset information are template processed according to a preset oxygen storage amount detection template information, and the oxygen storage amount of the catalyst is obtained. In the whole process, compared with the detection of the oxygen storage amount of the catalyst on a special test bench in the prior art, the catalyst oxygen storage amount detection method of the present application does not need a special test bench, is more simple and convenient, and can realize efficient catalyst oxygen storage amount detection through the oxygen storage amount detection template information and the collected hydrogen storage process time period, air coefficient offset information and other data. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0037] Figure 1 A scene schematic diagram of the oxygen storage amount detection method provided by the present application is shown in the following figure.

[0038] Figure 2 A flowchart of the oxygen storage amount detection method provided by the present application is shown in the following figure.

[0039] Figure 3 A flowchart of the oxygen storage amount detection method in another embodiment provided by the present application is shown in the following figure.

[0040] Figure 4 A structure schematic diagram of the oxygen storage amount detection device provided by the present application is shown in the following figure.

[0041] Figure 5 A structure schematic diagram of the electronic equipment provided by the present application is shown in the following figure.

[0042] The above figures have shown the specific embodiments of the present application, which will be described in more detail in the following. These figures and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] The exemplary embodiments will be described in detail below with reference to the accompanying drawings. The following description is presented in connection with the accompanying drawings in which the same numbers are used in different drawings to refer to the same or similar elements. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0044] The oxygen storage amount detection method provided by the embodiments of the present disclosure can be applied to the application environment as shown in the accompanying drawings. Figure 1 The vehicle 101 at least includes an engine 102, a catalyst 103 and an engine control unit ECU 104. The inlet of the catalyst 103 is communicated with the exhaust port of the engine 102. The engine control unit ECU 104 is used to control the operation of the engine 102 and the catalyst 103. The driving wheel of the vehicle 101 is placed on a hub 105, which is used to simulate road resistance and maintain the steady driving of the vehicle 101. The vehicle 101 is also provided with a terminal 106, which communicates with a server 107 through a network. The server 107 communicates with the engine control unit ECU 104 of the vehicle through a network.

[0045] For example, the oxygen storage amount detection method is applied to the terminal 106. After receiving the first oxygen storage amount detection instruction of the user, the terminal 106 sends a second oxygen storage amount detection instruction to the server 107. The server 107 responds to the second oxygen storage amount detection instruction, obtains the preset oxygen storage amount detection template information from the data storage system of itself, and feeds back to the terminal 106. At the same time, the server 107 also sends a data monitoring instruction to the engine control unit ECU 104. The engine control unit ECU 104 obtains the start time step of the catalyst 103 of the engine 102 starting to store oxygen and the end time step of the oxygen storage amount of the catalyst 103 exceeding the preset oxygen storage amount threshold in a preset first time period. The start time step is earlier than the end time step. The engine control unit ECU 104 detects the air coefficient offset information of the engine 102 when the exhaust gas of the engine 102 does not enter the catalyst 103 in a second time period from the start time step to the end time step. Then, the engine control unit ECU 104 sends the start time step, the end time step and the air coefficient offset information to the server 107. The server 107 sends the preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information to the terminal 106. The terminal 106 detects the oxygen storage amount of the catalyst 103 according to the preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information.

[0046] The terminal 106 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things device can be a smart speaker, a smart television, a smart air conditioner, a smart vehicle-mounted device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The server 107 can be implemented by a stand-alone server or a server cluster composed of multiple servers. The terminal 106 and the server 107 can be directly or indirectly connected through wired or wireless communication, for example, through network connection.

[0047] For another example, the oxygen storage amount detection method is applied to the server 107. After receiving a first oxygen storage amount detection instruction of a user, the terminal 106 sends a second oxygen storage amount detection instruction to the server 107. The server 107 responds to the second oxygen storage amount detection instruction and obtains a preset oxygen storage amount detection template information from a data storage system of the server 107. Meanwhile, the server 107 also sends a data monitoring instruction to the engine control unit ECU 104. The engine control unit ECU 104 obtains a start time step at which the catalyst 103 of the engine 102 starts to store oxygen and an end time step at which the oxygen storage amount of the catalyst 103 exceeds a preset oxygen storage amount threshold in a preset first time period. The start time step is earlier than the end time step. The engine control unit ECU 104 detects air coefficient offset information of the engine 102 when the exhaust gas of the engine 102 does not enter the catalyst 103 in a second time period from the start time step to the end time step. Then, the engine control unit ECU 104 sends the start time step, the end time step, and the air coefficient offset information to the server 107. The server 107 detects the oxygen storage amount of the catalyst 103 according to the preset oxygen storage amount detection template information, the start time step, the end time step, and the air coefficient offset information. Further, the server 107 can also push the oxygen storage amount of the catalyst 103 to the terminal 106 to display to the user on an interface of the terminal 106.

[0048] It can be understood that the data storage system can be a stand-alone storage device, or the data storage system is located on the server 107, or the data storage system is located on another terminal.

[0049] In one embodiment, an oxygen storage amount detection method is provided. In this embodiment, the oxygen storage amount detection method is applied to a terminal. It can be understood that the oxygen storage amount detection method can also be applied to a server and can also be applied to a system including a terminal and a server and implemented through interaction of the terminal and the server. As shown in Figure 2 The oxygen storage amount detection method includes:

[0050] S202, in a preset first time period, obtain a start time step at which the catalyst of the engine starts to store oxygen, and an end time step at which the oxygen storage amount of the catalyst exceeds a preset oxygen storage amount threshold, wherein the start time step is earlier than the end time step.

[0051] The start time step is earlier than the end time step. The full name of the catalyst is three-way catalytic converter. Its core function is to promote the oxidation-reduction reaction of harmful gases in exhaust gas through catalyst (platinum, palladium, rhodium and other noble metals) to convert them into harmless substances.

[0052] The proportion of the mixture in the engine cylinder is different, which causes the engine to be in different working conditions. One is lean burn condition, which refers to a working condition in which the first excess air coefficient of the engine is higher than the standard air coefficient. In this condition, oxygen is relatively excessive to fuel, and fuel burns more fully. The other is rich burn condition, which is different from lean burn condition. The rich burn condition refers to a working condition in which the first excess air coefficient of the engine is lower than the standard air coefficient. In this condition, fuel is relatively excessive to oxygen, the combustion speed is fast, and the explosion force is strong, which can quickly improve the power output of the engine. In addition, when the first excess air coefficient is equal to the standard air coefficient, the engine can also be in a transition condition between lean burn condition and rich burn condition, which can also be regarded as a reference state for mutual switching between lean burn condition and rich burn condition.

[0053] In the case that the engine is in the lean burn condition, the oxygen in the exhaust gas of the engine is excessive. At this time, the catalyst preferentially completes the oxidation reaction, and the excess oxygen is adsorbed and stored by the oxygen storage material. In the case that the engine is in the rich burn condition, the fuel in the exhaust gas is excessive and the oxygen is insufficient. The catalyst releases the oxygen stored in the oxygen storage material to supplement the oxidant required for the oxidation reaction, so as to ensure the stability of the purification efficiency under different conditions.

[0054] Specifically, the exhaust gas of the engine of the vehicle needs to be treated by the catalyst to purify the exhaust gas of the engine, that is, the exhaust gas of the engine will enter the catalyst for purification from the inlet of the catalyst, and the purified exhaust gas will be discharged from the outlet of the catalyst. Therefore, a front oxygen sensor can be arranged at the inlet of the catalyst, and a rear oxygen sensor can be arranged at the outlet of the catalyst, so as to detect the oxygen storage amount of the catalyst through the front oxygen sensor and the rear oxygen sensor.

[0055] Further, based on the front-end oxygen sensor and the rear-end oxygen sensor arranged on the catalytic converter, the two time nodes of the oxygen storage initiation / saturation can be captured by the front-end oxygen sensor and the rear-end oxygen sensor respectively to detect the oxygen storage amount of the catalytic converter. Since the oxygen storage function of the catalytic converter is realized when the engine is in the lean combustion mode, the front-end oxygen sensor is used to monitor whether the engine enters the lean combustion mode from the rich combustion mode, and the rear-end oxygen sensor is used to monitor whether the oxygen storage amount of the catalytic converter is saturated, that is, whether the oxygen storage amount of the catalytic converter exceeds the preset oxygen storage amount threshold. If yes, the oxygen storage amount is saturated.

[0056] When the engine switches from the rich combustion mode to the lean combustion mode, the catalytic converter starts to store oxygen. When the oxygen storage amount of the catalytic converter exceeds the preset oxygen storage amount threshold, the oxygen stored in the catalytic converter is saturated. Therefore, the time step when the engine enters the lean combustion mode and the catalytic converter starts to store oxygen can be taken as the start time step, and the time step when the oxygen storage amount of the catalytic converter exceeds the preset oxygen storage amount threshold can be taken as the end time step.

[0057] In addition, the acquisition processes of the start time step and the end time step are both in the first time period, so as to avoid the interference of irrelevant working condition data.

[0058] S204, detecting air coefficient offset information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter in a second time period from the start time step to the end time step.

[0059] The air coefficient offset information refers to the offset information between the first excess air coefficient and the theoretical air-fuel ratio of the engine exhaust of the engine when the engine exhaust does not enter the catalytic converter. The air-fuel ratio is the mass ratio of air to fuel in the engine intake.

[0060] Specifically, the start time step is the time step when the engine enters the lean combustion mode and the catalytic converter starts to store oxygen, and the end time step is the time step when the oxygen storage amount of the catalytic converter is saturated. The monitoring process of the air coefficient offset information is limited in the second time period from the start time step to the end time step, so as to associate the monitoring process of the air coefficient offset information with the oxygen storage process of the catalytic converter, and thus accurately monitor the first excess air coefficient of the engine exhaust of the engine when the engine exhaust does not enter the catalytic converter, and obtain the air coefficient offset information of the engine exhaust in combination with the standard air coefficient of the engine exhaust.

[0061] S206, detecting the oxygen storage amount of the catalytic converter according to the preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information.

[0062] Specifically, in the present application, the INCA (Integrated Calibration and Application Tool) software is generally used to generate and store the oxygen storage amount detection template information, and then the start time step, the end time step and the air coefficient offset information are substituted into the oxygen storage amount detection template information to obtain the oxygen storage amount of the catalytic converter.

[0063] In the above-mentioned oxygen storage amount detection method, first, the start time step at which the catalytic converter of the engine starts to store oxygen and the end time step at which the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold are obtained within a preset first time period, wherein the start time step is earlier than the end time step, and the air coefficient offset information when the engine exhaust of the engine does not enter the catalytic converter within a second time period from the start time step to the end time step is detected; after the above-mentioned data is collected, the start time step, the end time step and the air coefficient offset information are template processed according to the preset oxygen storage amount detection template information to obtain the oxygen storage amount of the catalytic converter. In the whole process, compared with the detection of the oxygen storage amount of the catalytic converter on a special test bench in the prior art, the catalytic converter oxygen storage amount detection method of the present application does not need a special test bench, and is more simple and convenient. Through the oxygen storage amount detection template information and the collected data, efficient catalytic converter oxygen storage amount detection can be realized.

[0064] In one exemplary embodiment, as shown in Figure 3 S202 includes:

[0065] S302, using a front oxygen sensor at the inlet of the catalytic converter of the engine, monitors the first air-fuel ratio when the engine exhaust of the engine does not enter the catalytic converter.

[0066] S304, according to the first air-fuel ratio and a preset theoretical air-fuel ratio, detects the first excess air coefficient of the engine exhaust before entering the catalytic converter.

[0067] S306, obtains the first time step when the first excess air coefficient changes from less than a preset standard air coefficient to more than the preset standard air coefficient, and determines the first time step as the start time step at which the catalytic converter starts to store oxygen.

[0068] S308, obtains the end time step at which the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold.

[0069] The air-fuel ratio refers to the ratio of air to fuel in the mixture. The excess air coefficient refers to the ratio of the actual amount of air supplied to the theoretical amount of air required for complete combustion of fuel when the fuel is burned, which can also be equivalently expressed as the ratio of the actual air-fuel ratio to the theoretical air-fuel ratio.

[0070] Specifically, the stoichiometric air-fuel ratio is used to represent the air-fuel ratio reference value when the engine switches between the lean combustion mode and the rich combustion mode, the first excess air coefficient directly reflects the air coefficient of the engine exhaust before entering the catalytic converter, and the first excess air coefficient can be determined by the ratio of the first air-fuel ratio to the preset stoichiometric air-fuel ratio. When the first excess air coefficient is greater than the preset standard air coefficient, the engine is in the lean combustion mode; when the first excess air coefficient is less than the preset standard air coefficient, the engine is in the rich combustion mode. In practical application, the preset standard air coefficient is the limit value when the engine switches between the rich combustion mode and the lean combustion mode, and the preset standard air coefficient is generally 1, at this time, the first air-fuel ratio is equal to the stoichiometric air-fuel ratio. The stoichiometric air-fuel ratio is generally 14.7, that is, when the first excess air coefficient is greater than 1 or the first air-fuel ratio is greater than 14.7, the engine is in the lean combustion mode; when the first excess air coefficient is less than 1 or the first air-fuel ratio is less than 14.7, the engine is in the rich combustion mode.

[0071] When the engine switches from the rich combustion mode to the lean combustion mode, that is, the first excess air coefficient changes from less than the preset standard air coefficient to greater than the preset standard air coefficient, excess oxygen begins to appear in the engine exhaust, and the catalytic converter starts the oxygen storage process at this time. Therefore, the first time step when the first excess air coefficient changes from less than the preset standard air coefficient to greater than the preset standard air coefficient can be determined as the start time step of the catalytic converter starting to store oxygen, that is, the first time step is the time step when the engine switches from the rich combustion mode to the lean combustion mode. Further, the first time step when the first excess air coefficient changes from less than the preset standard air coefficient to greater than the preset standard air coefficient can be determined by using the front oxygen sensor at the inlet of the catalytic converter of the engine, that is, by using the front oxygen sensor at the inlet of the catalytic converter of the engine, the first air-fuel ratio of the engine exhaust before entering the catalytic converter is monitored, and then the first excess air coefficient is obtained according to the ratio between the first air-fuel ratio and the stoichiometric air-fuel ratio, and finally the first time step when the first excess air coefficient changes from less than the preset standard air coefficient to greater than the preset standard air coefficient is determined. In practical application, since the preset standard air coefficient is generally 14.7, the first time step can be considered as the time when the first excess air coefficient is 14.6.

[0072] In some optional embodiments, the first excess air coefficient can also be replaced by the first air-fuel ratio, specifically: obtaining a third time step when the first air-fuel ratio changes from less than the stoichiometric air-fuel ratio to greater than the stoichiometric air-fuel ratio, and determining the third time step as the start time step of the catalytic converter starting to store oxygen.

[0073] In the above embodiments, by utilizing the front-end oxygen sensor at the catalytic converter inlet of the engine, the first air-fuel ratio before the engine exhaust enters the catalytic converter can be efficiently monitored. Then, by combining the theoretical air-fuel ratio and the first air-fuel ratio, the first excess air coefficient before the engine exhaust enters the catalytic converter can be determined. Based on the first time step when the first excess air coefficient changes from less than the preset standard air coefficient to greater than the preset standard air coefficient, the start time step of the catalytic converter starting to store oxygen can be accurately determined.

[0074] In one exemplary embodiment, detecting the engine exhaust gas coefficient offset information of the engine before entering the catalytic converter during a second time period from the start time step to the end time step includes:

[0075] Based on the first excess air coefficient and the preset standard air coefficient, the air coefficient deviation information of the engine exhaust before entering the catalyst is detected.

[0076] Specifically, since the first excess air coefficient is the ratio of the first air-fuel ratio to the stoichiometric air-fuel ratio, and the preset standard air coefficient is the boundary value for the engine to switch between rich and lean combustion conditions, it is a theoretical value. Therefore, by comparing and analyzing the first excess air coefficient and the preset standard air coefficient, the ratio of the first excess air coefficient to the preset standard air coefficient is obtained, and this ratio is determined as the air coefficient deviation information of the engine exhaust before it enters the catalytic converter.

[0077] In practical applications, the preset standard air coefficient is generally 1. When the first excess air coefficient is greater than 1, the air coefficient offset information is positive, indicating that there is excess oxygen in the engine exhaust. When the first excess air coefficient is less than 1, the air coefficient offset information is negative, indicating that there is insufficient oxygen in the engine exhaust.

[0078] In an optional embodiment, for a two-point oxygen sensor, as can be seen from its characteristic curve, the 450mV output of the two-point oxygen sensor generally corresponds to the moment when the first excess air coefficient is equal to 1.

[0079] In the above embodiments, by comparing and analyzing the first excess air coefficient with the preset standard air coefficient, the air coefficient deviation information of the engine exhaust before entering the catalytic converter can be accurately determined.

[0080] In an exemplary embodiment, the step of determining the end time when the oxygen storage capacity of the catalyst exceeds a preset oxygen storage capacity threshold includes:

[0081] The second air-fuel ratio of the engine exhaust entering the catalytic converter is monitored by using a rear-end oxygen sensor at the outlet of the catalytic converter; the second excess air coefficient of the engine exhaust entering the catalytic converter is detected according to the second air-fuel ratio; a second time step when the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient is obtained, and the second time step is determined as the end time step when the oxygen storage capacity of the catalytic converter exceeds the preset oxygen storage capacity threshold.

[0082] Specifically, when the catalytic converter purifies the engine exhaust, the catalytic converter continuously adsorbs oxygen, so that the oxygen content in the engine exhaust is extremely low and stable, and the second air-fuel ratio of the engine exhaust monitored by the rear-end oxygen sensor at the outlet of the catalytic converter is stable near the theoretical air-fuel ratio, which forms a clear difference with the first air-fuel ratio monitored by the front-end oxygen sensor. When the catalytic converter is saturated with oxygen storage, excess oxygen cannot be adsorbed and directly penetrates the catalytic converter to the downstream and outlet of the catalytic converter, causing the second air-fuel ratio monitored by the rear-end oxygen sensor to rapidly rise and approach the first air-fuel ratio. At this time, the second air-fuel ratio changes from being less than the theoretical air-fuel ratio to being greater than the theoretical air-fuel ratio, and the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient. The time step at this time is obtained as the second time step, and the second time step is determined as the end time step when the oxygen storage capacity of the catalytic converter exceeds the preset oxygen storage capacity threshold. In actual application, the rear-end oxygen sensor can be identified as VO2B1S2, i.e., oxygen sensor voltage signal VO2-1 cylinder column B1-2 sensor (rear-end oxygen) S2.

[0083] In some optional embodiments, the second excess air coefficient can also be replaced by the second air-fuel ratio, specifically: a fourth time step when the second air-fuel ratio changes from being less than the theoretical air-fuel ratio to being greater than the theoretical air-fuel ratio is obtained, and the fourth time step is determined as the end time step when the oxygen storage capacity of the catalytic converter exceeds the preset oxygen storage capacity threshold.

[0084] In the above embodiments, by arranging the rear-end oxygen sensor at the outlet of the catalytic converter, the second air-fuel ratio at the outlet of the catalytic converter can be more efficiently monitored, and then the second excess air coefficient of the engine exhaust entering the catalytic converter is determined by combining the theoretical air-fuel ratio and the second air-fuel ratio. Therefore, the end time step when the oxygen storage capacity of the catalytic converter exceeds the preset oxygen storage capacity threshold is accurately determined based on the second time step when the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient.

[0085] In an exemplary embodiment, the preset oxygen storage capacity detection template information at least includes an air flow and oxygen storage capacity detection model of the engine, and the oxygen storage capacity detection model is used to represent the mapping relationship between the oxygen storage capacity of the catalytic converter, the air flow, the start time step, the end time step, and the air coefficient offset information;

[0086] According to the preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information, the oxygen storage amount of the catalytic converter is detected, comprising:

[0087] According to the oxygen storage amount detection model, the air coefficient offset information and the air flow of the engine are time-integrated in the second time period from the start time step to the end time step, to obtain the oxygen storage amount of the catalytic converter.

[0088] The air flow of the engine is the air mass or volume entering the engine cylinder for combustion per unit time.

[0089] Specifically, the air flow, the start time step, the end time step and the air coefficient offset information are substituted into the oxygen storage amount detection model to obtain the oxygen storage amount of the catalytic converter.

[0090] The preset oxygen storage amount detection template information not only includes the air flow of the engine and the oxygen storage amount detection model, but also includes a pre-acquired dimensionless constant.

[0091] At this time, the oxygen storage amount detection model is used to represent the mapping relationship between the oxygen storage amount of the catalytic converter, the dimensionless constant, the air flow, the start time step, the end time step and the air coefficient offset information.

[0092] Therefore, according to the substitution of the pre-acquired dimensionless constant, the air flow, the start time step, the end time step and the air coefficient offset information into the oxygen storage amount detection model, the air coefficient offset information and the air flow of the engine can be time-integrated in the second time period from the start time step to the end time step according to the oxygen storage amount detection model, to obtain the oxygen storage amount of the catalytic converter.

[0093] In an optional embodiment, the expression of the oxygen storage amount detection model is as follows:

[0094]

[0095] Wherein, OSC is the oxygen storage amount of the catalytic converter, the unit is milligrams, 64.89 is a pre-acquired dimensionless constant, t1 is the start time step, t2 is the end time step, λ-1 is the air coefficient offset information, λ is the first excess air coefficient, and ml_w is the air flow of the engine.

[0096] It can be seen that by time-integrating the air coefficient offset information and the air flow of the engine through the start time step and the end time step, the oxygen storage amount in the time period from the start of oxygen storage to the saturation of oxygen storage can be obtained, that is, the oxygen storage amount of the catalytic converter.

[0097] In the above embodiment, without a special test bench, the air flow of the engine and the oxygen storage amount detection model included in the preset oxygen storage amount detection template information can be used to efficiently obtain the oxygen storage amount of the catalytic converter.

[0098] In one exemplary embodiment, the oxygen storage amount detection method further comprises:

[0099] During the process that the target vehicle is running on the hub, the engine control unit of the engine adjusts the actual air-fuel ratio of the mixture in the cylinder of the engine; according to the adjusted actual air-fuel ratio, the state of the engine is switched between the rich combustion state and the lean combustion state.

[0100] Specifically, during the process that the target vehicle is running on the hub, the engine control unit ECU of the engine adjusts the fuel injection amount / air intake amount according to the working condition (load, speed, emission requirement) to change the actual air-fuel ratio of the engine. Further, since the actual air-fuel ratio is proportional to the excess air coefficient, and when the excess air coefficient is less than the standard air coefficient, the engine is in the rich combustion condition, and when the excess air coefficient is greater than the standard air coefficient, the engine is in the lean combustion condition, therefore, by changing the actual air-fuel ratio of the engine, the engine can be switched between the rich combustion condition and the lean combustion condition.

[0101] In the above embodiment, by adjusting the actual air-fuel ratio of the mixture in the cylinder of the engine through the engine control unit of the engine, the state of the engine can be reliably controlled to switch between the rich combustion state and the lean combustion state, and thus the engine is in the optimal operating range under different operating conditions.

[0102] In order to make the person skilled in the art understand the content of the present application more conveniently, the oxygen storage amount detection method of the present application will be described in detail below with a specific application example as follows:

[0103] S1, using the front-end oxygen sensor at the inlet of the catalyst of the engine of the vehicle, monitoring the first air-fuel ratio of the engine exhaust before entering the catalyst; according to the ratio of the first air-fuel ratio to the preset theoretical air-fuel ratio, obtaining the first excess air coefficient λ of the engine exhaust before entering the catalyst; the first time step when the first excess air coefficient λ is converted from less than the preset standard air coefficient to greater than the preset standard air coefficient is determined as the start time step t1 of the catalyst starting to store oxygen. The first time step can be considered as the moment when the engine just jumps from the rich combustion condition to the lean combustion condition, which can be considered as the moment when the first air-fuel ratio = 14.6.

[0104] S2, using the rear-end oxygen sensor at the outlet of the catalyst, monitoring the second air-fuel ratio of the engine exhaust after entering the catalyst, and detecting the second excess air coefficient of the engine exhaust after entering the catalyst according to the second air-fuel ratio; when the second excess air coefficient is converted from less than the preset standard air coefficient to greater than the preset standard air coefficient, the catalyst is saturated with oxygen storage, and the time step is determined as the end time step when the oxygen storage amount of the catalyst exceeds the preset oxygen storage amount threshold.

[0105] S3, obtaining an oxygen storage amount detection model by using catalyst oxygen storage amount detection template information in the INCA software, the oxygen storage amount detection model being:

[0106]

[0107] Wherein, OSC is the oxygen storage amount of the catalyst, the unit is milligrams, 64.89 is a dimensionless constant obtained in advance, which can be obtained by the oxygen storage amount detection template information, t1 is the start time step, t2 is the end time step, λ is the first excess air ratio of the engine exhaust before entering the catalyst, 1 is the standard air ratio, that is, the air ratio when the first air-fuel ratio is equal to the theoretical air-fuel ratio, and ml_w is the air flow of the engine, which can be obtained by the oxygen storage amount detection template information.

[0108] It is found through research that the oxygen storage amount measured by the catalyst supplier on a special test bench is 1174mg, and the oxygen storage amount calculated by the INCA is basically consistent with the oxygen storage amount measured on the special test bench.

[0109] Through the above oxygen storage amount detection method, the engine rich and lean process can be realized by manually adjusting the air-fuel ratio through the INCA software during the process of the whole vehicle driving on the hub in a steady state. At this time, the related oxygen storage amount calculation data in the engine control unit ECU for controlling the engine can be collected, and then the integral function in the INCA can be used to calculate the oxygen storage amount of the catalyst.

[0110] It should be understood that although each step in the flowchart involved in the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time step, but can be executed at different time steps, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0111] Based on the same inventive concept, the embodiments of the present application also provide an oxygen storage amount detection device for implementing the above-mentioned oxygen storage amount detection method. The implementation scheme for solving the problem provided by the oxygen storage amount detection device is similar to the implementation scheme described in the above oxygen storage amount detection method, so the specific limitations in one or more device embodiments provided below can refer to the limitations of the oxygen storage amount detection method described above, which will not be repeated here.

[0112] In one embodiment, as shown in Figure 4 an oxygen storage amount detection device 200 is provided, comprising:

[0113] an oxygen storage time period determination module 202, configured to acquire a start time step at which the catalytic converter of the engine starts to store oxygen and an end time step at which the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold value within a preset first time period, wherein the start time step is earlier than the end time step;

[0114] an air-fuel ratio offset determination module 204, configured to detect air coefficient offset information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter within a second time period from the start time step to the end time step;

[0115] an oxygen storage amount detection module 206, configured to detect the oxygen storage amount of the catalytic converter according to preset oxygen storage amount detection template information, the start time step, the end time step and the air coefficient offset information.

[0116] In some optional embodiments, the oxygen storage time period determination module 202 is further configured to monitor a first air-fuel ratio of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter by using a front oxygen sensor at an inlet of the catalytic converter of the engine; detect a first excess air coefficient of the engine exhaust of the engine before entering the catalytic converter according to the first air-fuel ratio and a preset theoretical air-fuel ratio; acquire a first time step at which the first excess air coefficient changes from being less than a preset standard air coefficient to being greater than the preset standard air coefficient, and determine the first time step as the start time step at which the catalytic converter starts to store oxygen.

[0117] In some optional embodiments, the air-fuel ratio offset determination module 204 is further configured to detect the air coefficient offset information of the engine exhaust when the engine exhaust does not enter the catalytic converter according to the first excess air coefficient and the preset standard air coefficient.

[0118] In some optional embodiments, the oxygen storage time period determination module 202 is further configured to monitor a second air-fuel ratio of the engine exhaust after entering the catalytic converter by using a rear oxygen sensor at an outlet of the catalytic converter; detect a second excess air coefficient of the engine exhaust of the engine after entering the catalytic converter according to the second air-fuel ratio; acquire a second time step at which the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient, and determine the second time step as the end time step at which the oxygen storage amount of the catalytic converter exceeds the preset oxygen storage amount threshold value.

[0119] In some optional embodiments, the preset oxygen storage detection template information includes at least the engine's airflow and oxygen storage detection model. The oxygen storage detection model is used to characterize the mapping relationship between the catalyst's oxygen storage, airflow, start time step, end time step, and air coefficient offset information. The oxygen storage detection module 206 is also used to perform time integration of the air coefficient offset information and the engine's airflow during the second time period from the start time step to the end time step, based on the oxygen storage detection model, to obtain the catalyst's oxygen storage.

[0120] In some optional embodiments, the oxygen storage detection device further includes an adjustment module, which controls the engine control unit of the engine to adjust the actual air-fuel ratio of the air-fuel mixture in the engine cylinder during the process of the target vehicle driving on the rotating hub; and controls the engine state to switch between rich combustion and lean combustion states according to the adjusted actual air-fuel ratio.

[0121] Each module in the above-mentioned device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0122] Figure 5 A schematic diagram of the structure of the electronic device provided in this application. Figure 5 As shown, the electronic device 500 provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the device 500 further includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus 504.

[0123] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.

[0124] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0125] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0126] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0127] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0128] The present application also provides a computer program product, comprising a computer program, which is executed by a processor to implement the above method.

[0129] The present application also provides a computer readable storage medium, which stores computer execution instructions, and when the processor executes the computer execution instructions, the above method is implemented.

[0130] The above readable storage medium can be implemented by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0131] An example readable storage medium is coupled to the processor such that the processor can read information from the readable storage medium and can write information to the readable storage medium. Of course, the readable storage medium can also be a part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0132] The division of units is only a logical functional division, and in actual implementation, there can be another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0133] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0134] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0135] If the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0136] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the foregoing storage medium includes various media capable of storing program codes, such as ROM, RAM, magnetic disk, or optical disk.

[0137] Finally, it should be noted that other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the present application disclosed herein. The present application is intended to include all such variations, uses, or adaptations of the application in which the general principles of the application are used to best advantage and encompassed within its scope. The present application is not limited to the precise structures described and shown in the accompanying drawings and figures, and can be practiced with variation of modifications and alterations without departing from the scope of the present application. The scope of the present application is limited only by the claims appended hereto.

Claims

1. A method of detecting an oxygen storage amount, characterized by, The method comprises: acquiring a start time step at which the catalyst of the engine starts to store oxygen and an end time step at which the oxygen storage amount of the catalyst exceeds a preset oxygen storage amount threshold within a preset first time period, wherein the start time step is earlier than the end time step; detecting air coefficient offset information of engine exhaust of the engine when the engine exhaust has not entered the catalyst within a second time period from the start time step to the end time step; detecting the oxygen storage amount of the catalyst according to a preset oxygen storage amount detection template, the start time step, the end time step, and the air coefficient offset information.

2. The method of claim 1, wherein, The method comprises: monitoring a first air-fuel ratio of engine exhaust of the engine when the engine exhaust has not entered the catalyst by using a front oxygen sensor at an inlet of the catalyst of the engine; detecting a first excess air coefficient of the engine exhaust of the engine before entering the catalyst according to the first air-fuel ratio and a preset theoretical air-fuel ratio; acquiring a first time step at which the first excess air coefficient changes from being less than a preset standard air coefficient to being greater than the preset standard air coefficient, and determining the first time step as the start time step at which the catalyst starts to store oxygen.

3. The method of claim 2, wherein, The method comprises: detecting air coefficient offset information of the engine exhaust when the engine exhaust has not entered the catalyst according to the first excess air coefficient and the preset standard air coefficient.

4. The method of claim 1, wherein, The method comprises: monitoring a second air-fuel ratio of the engine exhaust after entering the catalyst by using a rear oxygen sensor at an outlet of the catalyst; detecting a second excess air coefficient of the engine exhaust of the engine after entering the catalyst according to the second air-fuel ratio; acquiring a second time step at which the second excess air coefficient changes from being less than the preset standard air coefficient to being greater than the preset standard air coefficient, and determining the second time step as the end time step at which the oxygen storage amount of the catalyst exceeds the preset oxygen storage amount threshold.

5. The method of claim 1, wherein, The preset oxygen storage amount detection template at least comprises an air flow and oxygen storage amount detection model of the engine, and the oxygen storage amount detection model is used to represent a mapping relationship between the oxygen storage amount of the catalyst, the air flow, the start time step, the end time step, and the air coefficient offset information. The method comprises: performing time integration on the air coefficient offset information and the air flow of the engine within the second time period from the start time step to the end time step according to the oxygen storage amount detection model to obtain the oxygen storage amount of the catalyst.

6. The method of claim 1, wherein, The method further comprises: controlling an engine control unit of the engine to adjust an actual air-fuel ratio of a mixture in a cylinder of the engine during driving of a target vehicle on a hub. The state of the engine is controlled to switch between a rich combustion state and a lean combustion state in accordance with the adjusted actual air-fuel ratio.

7. An oxygen storage amount detecting apparatus characterized by comprising: The method comprises the steps of: The oxygen storage period determination module is configured to obtain a start time step at which the catalyst of the engine starts to store oxygen and an end time step at which the amount of stored oxygen of the catalyst exceeds a preset oxygen storage threshold within a preset first time period, wherein the start time step is earlier than the end time step; The air-fuel ratio offset determination module is configured to detect air coefficient offset information of engine exhaust of the engine when the engine exhaust does not enter the catalyst within a second time period from the start time step to the end time step; The oxygen storage amount detection module is configured to detect the amount of stored oxygen of the catalyst according to preset oxygen storage amount detection template information, the start time step, the end time step, and the air coefficient offset information. 8.An electronic device comprising a memory and a processor, the memory storing a computer program, wherein, The processor executes the computer program to implement the steps of the method of any one of claims 1 to 6.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 6.

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