Method, apparatus, device, and storage medium for determining catalyst deterioration time

Abstract

The present invention relates to the technical field of vehicle testing, and discloses a method, device, equipment and storage medium for determining the catalyst deterioration time. The method includes: obtaining the initial temperature of the catalyst; determining the transient catalyst center temperature according to the target correction parameter, the preset temperature difference and the initial temperature of the catalyst; determining the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature; Since the present invention determines the transient catalyst center temperature through the target correction parameter, the preset temperature difference and the initial temperature of the catalyst, and then determines the catalyst deterioration time based on the preset catalyst deterioration time relationship and the transient catalyst center temperature. Compared with the prior art that determines the deterioration time through the catalyst temperature measured by a temperature sensor, it can realize determining the catalyst deterioration time through vehicle parameters and effectively improve the accuracy of determining the catalyst deterioration time.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and particularly to a method, apparatus, device and storage medium for determining the catalyst deterioration time. Background Art

[0002] With the steady improvement of China's economy, vehicles have gradually entered thousands of households and become a major means of travel for people. Inevitably, vehicle exhaust will pollute the air. To meet the emission standards and laws and regulations formulated by countries around the world, manufacturers reduce vehicle exhaust emissions by setting catalysts, that is, catalyst selection is carried out during development, and then a series of evaluation items are carried out. Among them, one item is to test and evaluate the durability of the catalyst under specific operating conditions, that is, catalyst deterioration evaluation. Currently, the commonly used catalyst deterioration evaluation method requires a test vehicle to conduct experiments on a roller for a long time according to established aging conditions and operating conditions, and calculate and evaluate using the catalyst temperature measured by a temperature sensor. That is, the current determination of the catalyst deterioration time is obtained from the measured exhaust temperature distribution through actual experiments. However, the accuracy of determining the catalyst deterioration time is relatively low, and the actual catalyst temperature needs to be measured.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide a method, apparatus, device and storage medium for determining the catalyst deterioration time, aiming to solve the technical problems that the prior art cannot determine the catalyst deterioration time through vehicle parameters and the accuracy of determining the catalyst deterioration time is relatively low.

[0005] To achieve the above object, the present invention provides a method for determining the catalyst deterioration time, and the method for determining the catalyst deterioration time includes the following steps:

[0006] Obtain the initial temperature of the catalyst;

[0007] Determine the transient catalyst center temperature according to the target correction parameter, the preset temperature difference and the initial temperature of the catalyst;

[0008] Determine the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature.

[0009] Optionally, the obtaining the initial temperature of the catalyst includes:

[0010] Obtain the corresponding vehicle speed, throttle pedal opening and engine speed according to the current driving parameters of the target vehicle;

[0011] Calculate the throttle pedal opening and the engine speed to obtain the initial throttle opening;

[0012] Adjust the initial throttle opening according to the vehicle speed to obtain the target throttle opening;

[0013] Calculate the engine speed and the target throttle opening according to the target bench performance temperature parameter to obtain the initial temperature of the catalyst.

[0014] Optionally, the determining the transient catalyst center temperature according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst includes:

[0015] Correct the initial temperature of the catalyst by the target correction parameter to obtain the transient catalyst inlet temperature;

[0016] Determine the transient catalyst center temperature according to the preset temperature difference and the transient catalyst inlet temperature.

[0017] Optionally, the target correction parameter includes a target intake parameter and a target start parameter; correcting the initial temperature of the catalyst by the target correction parameter to obtain the transient catalyst inlet temperature includes:

[0018] Obtain the corresponding intake air temperature and intake air flow according to the target intake parameter;

[0019] Correct the initial temperature of the catalyst by the intake air temperature to obtain the intake air corrected temperature;

[0020] Correct the filtering time constant of the intake air corrected temperature by the intake air flow to obtain the flow corrected temperature;

[0021] Obtain the corresponding start flag according to the target start parameter;

[0022] Correct the cold start temperature of the flow corrected temperature by the start flag to obtain the transient catalyst inlet temperature.

[0023] Optionally, the correcting the initial temperature of the catalyst by the intake air temperature to obtain the intake air corrected temperature includes:

[0024] When the intake air temperature is not equal to the target temperature, determine whether the intake air temperature is less than the target temperature;

[0025] When the intake air temperature is less than the target temperature, obtain the first intake air corrected temperature according to the initial temperature of the catalyst, the target temperature, the intake air temperature, and the first parameter.

[0026] Optionally, after determining whether the intake air temperature is less than the target temperature when the intake air temperature is not equal to the target temperature, it further includes:

[0027] When the intake air temperature is greater than the target temperature, a second intake air correction temperature is obtained based on the initial temperature of the catalyst, the target temperature, the intake air temperature, and a second parameter.

[0028] Optionally, filtering time constant correction is performed on the intake air correction temperature through the intake air flow rate to obtain a flow rate correction temperature, including:

[0029] Calculating the intake air flow rate through a preset flow rate filtering constant relationship to obtain a target filtering time constant;

[0030] Obtaining the current intake air correction temperature and the previous intake air correction temperature based on the target filtering time constant and the intake air correction temperature;

[0031] Performing cumulative calculation on the current intake air correction temperature and the previous intake air correction temperature to obtain a flow rate correction temperature.

[0032] Optionally, cold start temperature correction is performed on the flow rate correction temperature through the start flag to obtain a transient catalyst inlet temperature, including:

[0033] When the start flag is the target flag, determining whether the current start time of the target vehicle is greater than or equal to the first stage time;

[0034] When the current start time is greater than or equal to the first stage time, obtaining the current corrected cold start temperature;

[0035] Obtaining the transient catalyst inlet temperature through the current corrected cold start temperature.

[0036] Optionally, after determining whether the current start time of the target vehicle is greater than or equal to the first stage time when the start flag is the target flag, further including:

[0037] When the current start time is less than the first stage time, determining whether the current start time is less than the second stage time;

[0038] When the current start time is less than the second stage time, calculating the flow rate correction temperature and the current coefficient to obtain a transient catalyst inlet temperature.

[0039] Optionally, determining the catalyst deterioration time of the target vehicle through a preset catalyst deterioration time relationship and the transient catalyst center temperature, including:

[0040] Calculating the transient catalyst center temperature according to a preset catalyst deterioration time relationship to obtain a catalyst deterioration rate and a catalyst deterioration time parameter;

[0041] Calculating the catalyst deterioration rate and the catalyst deterioration time parameter to obtain the current instantaneous deterioration time;

[0042] Accumulate and calculate the last deterioration time and the current instantaneous deterioration time to obtain the catalyst deterioration time of the target vehicle.

[0043] In addition, to achieve the above object, the present invention also provides a device for determining the catalyst deterioration time, the device for determining the catalyst deterioration time includes:

[0044] An acquisition module, configured to acquire the initial temperature of the catalyst;

[0045] A determination module, configured to determine the transient catalyst center temperature according to the target correction parameter, the preset temperature difference and the initial temperature of the catalyst;

[0046] The determination module is further configured to determine the catalyst deterioration time of the target vehicle through a preset catalyst deterioration time relationship and the transient catalyst center temperature.

[0047] In addition, to achieve the above object, the present invention also provides a device for determining the catalyst deterioration time, the device for determining the catalyst deterioration time includes: a memory, a processor, and a catalyst deterioration time determination program stored on the memory and executable on the processor, the catalyst deterioration time determination program is configured to implement the catalyst deterioration time determination method as described above.

[0048] In addition, to achieve the above object, the present invention also provides a storage medium, on which a catalyst deterioration time determination program is stored, and when the catalyst deterioration time determination program is executed by a processor, it implements the catalyst deterioration time determination method as described above.

[0049] The method for determining the catalyst deterioration time proposed by the present invention calculates the current driving parameters of the target vehicle according to the target bench performance temperature parameter to obtain the initial temperature of the catalyst; corrects the initial temperature of the catalyst through the target intake parameter and the target start parameter to obtain the transient catalyst inlet temperature; determines the transient catalyst center temperature according to the preset temperature difference and the transient catalyst inlet temperature; determines the catalyst deterioration time of the target vehicle through a preset catalyst deterioration time relationship and the transient catalyst center temperature; since the present invention determines the transient catalyst center temperature through the preset temperature difference and the transient catalyst inlet temperature, and then determines the catalyst deterioration time based on the preset catalyst deterioration time relationship and the transient catalyst center temperature, compared with the prior art that determines the deterioration time through the catalyst temperature measured by a temperature sensor, it can realize determining the catalyst deterioration time through vehicle parameters and effectively improve the accuracy of determining the catalyst deterioration time. Description of the Drawings

[0050] Figure 1 It is a schematic structural diagram of a device for determining the catalyst deterioration time in the hardware operating environment related to the embodiment solution of the present invention;

[0051] Figure 2 It is a schematic flowchart of the first embodiment of the method for determining the catalyst deterioration time of the present invention;

[0052] Figure 3 It is a schematic overall flowchart of an embodiment of the method for determining the catalyst deterioration time of the present invention;

[0053] Figure 4 It is a schematic diagram of the catalyst deterioration time curve of the second embodiment of the method for determining the catalyst deterioration time of the present invention;

[0054] Figure 5 It is a schematic flowchart of the second embodiment of the method for determining the catalyst deterioration time of the present invention;

[0055] Figure 6 It is a schematic flowchart of the third embodiment of the method for determining the catalyst deterioration time of the present invention;

[0056] Figure 7 It is a schematic diagram of the functional modules of the first embodiment of the device for determining the catalyst deterioration time of the present invention.

[0057] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments

[0058] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0059] Refer to Figure 1 , Figure 1 It is a schematic diagram of the structure of the device for determining the catalyst deterioration time of the hardware operating environment involved in the embodiment solution of the present invention.

[0060] Such as Figure 1As shown in the figure, the device for determining the catalyst deterioration time may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed Random Access Memory (RAM) or a stable Non-Volatile Memory (NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0061] Those skilled in the art can understand that Figure 1 the structure shown in the figure does not constitute a limitation on the device for determining the catalyst deterioration time, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0062] As Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a program for determining the catalyst deterioration time.

[0063] In Figure 1 the device for determining the catalyst deterioration time shown in the figure, the network interface 1004 is mainly used for data communication with a network integrated platform workstation; the user interface 1003 is mainly used for data interaction with users; the processor 1001 and the memory 1005 in the device for determining the catalyst deterioration time of the present invention may be provided in the device for determining the catalyst deterioration time. The device for determining the catalyst deterioration time calls the program for determining the catalyst deterioration time stored in the memory 1005 through the processor 1001 and executes the method for determining the catalyst deterioration time provided in the embodiments of the present invention.

[0064] Based on the above hardware structure, an embodiment of the method for determining the catalyst deterioration time of the present invention is proposed.

[0065] Referring to Figure 2 , Figure 2 is a schematic flowchart of the first embodiment of the method for determining the catalyst deterioration time of the present invention.

[0066] In the first embodiment, the method for determining the catalyst deterioration time includes the following steps:

[0067] Step S10, obtaining the initial temperature of the catalyst.

[0068] It should be noted that the execution subject of this embodiment is the device for determining the catalyst deterioration time, and it can also be other devices that can achieve the same or similar functions, such as the vehicle control unit, etc. This embodiment does not limit this. In this embodiment, the vehicle control unit is taken as an example for illustration.

[0069] It should be understood that the initial temperature refers to the basic temperature of the catalyst, that is, the temperature of the catalyst before the target vehicle starts.

[0070] Further, step S10 includes: obtaining the corresponding vehicle speed, accelerator pedal opening, and engine speed according to the current driving parameters of the target vehicle; calculating the initial throttle opening based on the accelerator pedal opening and the engine speed; adjusting the initial throttle opening through the vehicle speed to obtain the target throttle opening; calculating the initial temperature of the catalyst based on the target bench performance temperature parameters for the engine speed and the target throttle opening.

[0071] It can be understood that the current driving parameters refer to the parameters of the target vehicle during actual driving. The current driving parameters include the vehicle speed, accelerator pedal opening, and engine speed of the target vehicle. The current driving parameters are obtained through the in-vehicle network CAN signal. The initial temperature refers to the basic temperature of the catalyst, and the target bench performance temperature parameters refer to the parameters in the bench full-performance temperature map. The target bench performance temperature parameters are specifically the emission temperature basic parameters in the full engine operating range obtained by testing the engine on an actual bench based on different engine speeds and throttle openings. The structure is a two-dimensional data table with the engine speed and throttle opening as the axes.

[0072] It can be understood that the initial throttle opening refers to the initial opening angle of the engine throttle. As any one of the vehicle speed, accelerator pedal, and engine parameters changes, the engine throttle will also change accordingly. The initial throttle opening is calculated based on the accelerator pedal opening and the engine speed.

[0073] It should be understood that the target throttle opening refers to the throttle opening after adjustment considering the influence of the vehicle speed on the throttle opening. Specifically, after obtaining the vehicle speed of the target vehicle, the initial throttle opening is adjusted through the vehicle speed to obtain the target throttle opening. Then, the initial temperature of the catalyst is obtained by calculating the engine speed and the target throttle opening based on the target bench performance temperature parameters.

[0074] Step S20: Determine the transient catalyst center temperature based on the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst.

[0075] It can be understood that the target correction parameter refers to the parameter for correcting the initial temperature of the catalyst. The target correction parameter includes the target intake parameter and the target start parameter. The target intake parameter refers to the intake parameter entering the engine at the engine intake manifold. The target intake parameter includes the intake temperature and the intake flow rate. The intake temperature refers to the temperature of the air entering the engine, which can be measured by a temperature sensor, and the intake flow rate refers to the flow rate of the air entering the engine.

[0076] It should be understood that the target start parameter refers to the parameter during the start of the target vehicle. The target start parameter includes the start flag, and the start flag is divided into "0" and "1". When the start flag of the target vehicle is "1", it indicates that cold start temperature correction is required. When the start flag of the target vehicle is "0", cold start temperature correction is not required. The preset temperature difference refers to the temperature difference between the transient catalyst inlet and the transient catalyst center.

[0077] It can be understood that after obtaining the initial temperature of the catalyst, the transient catalyst center temperature is determined based on the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst. Specifically: Calculate the transient catalyst inlet temperature based on the target correction parameter and the target correction parameter, and then determine the transient catalyst center temperature based on the transient catalyst inlet temperature and the preset temperature difference.

[0078] Step S30: Determine the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature.

[0079] It can be understood that the catalyst deterioration time refers to the actual deterioration time of the catalyst during the driving of the target vehicle. The preset catalyst deterioration time relationship refers to a two-dimensional relationship data table with the transient catalyst center temperature as the axis and the deterioration time as the value. Through the preset catalyst deterioration time relationship, the catalyst deterioration time under different transient catalyst center temperature conditions can be characterized, that is, the higher the transient catalyst center temperature, the shorter the catalyst deterioration time. Specifically, after obtaining the transient catalyst center temperature, calculate the transient catalyst center temperature through the preset catalyst deterioration time relationship to obtain the catalyst deterioration time of the target vehicle.

[0080] It should be understood that refer to Figure 3 , Figure 3It is a schematic diagram of the overall process. Specifically: obtain the current driving parameters of the target vehicle, calculate the current driving parameters through the performance temperature parameters of the target bench to obtain the initial temperature (basic temperature) of the catalyst, then calculate the initial temperature (basic temperature) of the catalyst through the target intake parameters and target start parameters to obtain the transient catalyst inlet temperature, and then calculate the transient catalyst center temperature through the preset temperature difference and the transient catalyst center temperature, and finally calculate the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature.

[0081] It can be understood that with reference to Figure 4 , Figure 4 It is a schematic diagram of the catalyst deterioration time curve. Specifically: this curve schematic diagram includes the catalyst deterioration time curve (curve one) determined based on the vehicle network and vehicle parameters and the catalyst deterioration time curve (curve two) determined based on the measured actual catalyst temperature. By comparing curve one and curve two at the same time, it is obtained that the change trend of the catalyst deterioration time of curve one and the catalyst deterioration time of curve two is very fitting, and the catalyst deterioration time of curve one is higher than the catalyst deterioration time of curve two. That is, through the comparison of the two, it can be known that the catalyst deterioration time can also be determined through vehicle parameters, and the accuracy of determining the catalyst deterioration time is relatively high.

[0082] In this embodiment, the initial temperature of the catalyst is obtained; the transient catalyst center temperature is determined according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst; the catalyst deterioration time of the target vehicle is determined through the preset catalyst deterioration time relationship and the transient catalyst center temperature; since in this embodiment, the transient catalyst center temperature is determined through the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst, and then the catalyst deterioration time is determined based on the preset catalyst deterioration time relationship and the transient catalyst center temperature. Compared with the prior art that determines the deterioration time through the catalyst temperature measured by a temperature sensor, it can realize determining the catalyst deterioration time through vehicle parameters and effectively improve the accuracy of determining the catalyst deterioration time.

[0083] In one embodiment, as Figure 5 described, a second embodiment of the method for determining the catalyst deterioration time of the present invention is proposed based on the first embodiment. The step S20 includes:

[0084] Step S201, correct the initial temperature of the catalyst through the target correction parameter to obtain the transient catalyst inlet temperature.

[0085] It should be understood that the transient catalyst inlet temperature refers to the temperature at the inlet of the catalyst under transient conditions, and this transient catalyst inlet temperature is obtained by correcting the initial temperature of the catalyst through the target correction parameter.

[0086] Further, step S201 includes: obtaining corresponding intake air temperature and intake air flow rate according to the target intake parameters; correcting the initial temperature of the catalyst through the intake air temperature to obtain a corrected intake air temperature; correcting the filtering time constant of the corrected intake air temperature through the intake air flow rate to obtain a flow rate-corrected temperature; obtaining a corresponding start flag according to the target start parameters; and correcting the cold start temperature of the flow rate-corrected temperature through the start flag to obtain the transient catalyst inlet temperature.

[0087] It can be understood that the intake air temperature refers to the temperature of the air entering the engine, which can be measured by a deployed temperature sensor or other temperature detection devices. This embodiment does not limit this, and taking the temperature sensor as an example for illustration, while the intake air flow rate refers to the flow rate of the air entering the engine, that is, the volume of the air entering the engine from the engine intake manifold can be determined through the intake air flow rate.

[0088] It can be understood that the corrected intake air temperature refers to the temperature after correcting the initial temperature of the catalyst. The correction of the initial temperature of the catalyst includes temperature reduction correction and temperature increase correction. Different ambient (climate and season) temperatures have different effects on the transient catalyst inlet temperature. For example, in high-temperature areas such as Turpan, the temperature is increased on the basis of the catalyst temperature calculated under standard conditions, and in low-temperature areas such as Heihe, the temperature is decreased on the basis of the catalyst temperature calculated under standard conditions.

[0089] It should be understood that the flow rate-corrected temperature refers to the temperature after correcting the corrected intake air temperature through the intake air flow rate, and this flow rate-corrected temperature is calculated through the target filtering time constant, the current corrected intake air temperature, and the previous corrected intake air temperature.

[0090] Further, correcting the initial temperature of the catalyst through the intake air temperature to obtain a corrected intake air temperature includes: when the intake air temperature is not equal to the target temperature, determining whether the intake air temperature is less than the target temperature; when the intake air temperature is less than the target temperature, obtaining a first corrected intake air temperature according to the initial temperature of the catalyst, the target temperature, the intake air temperature, and the first parameter.

[0091] It should be understood that the target temperature refers to the set comparison value of the intake air temperature, the first parameter refers to the parameter for calculating the reduced corrected temperature, and this first parameter can be a, and the first corrected intake air temperature refers to the temperature after reducing the initial temperature of the catalyst.

[0092] It is understandable that after obtaining the intake air temperature, it is necessary to determine whether the intake air temperature is equal to the set target temperature. If it is equal, the initial temperature of the catalyst is directly corrected by the intake air temperature. If it is not equal, it is necessary to continue to determine whether the intake air temperature is less than the target temperature. If so, the first intake air correction temperature is calculated, specifically: the first intake air correction temperature = T base -a*(T 进气 -T0), T base is the initial temperature of the catalyst, a is the first parameter, T 进气 is the intake air temperature, and T0 is the target temperature.

[0093] Furthermore, when the intake air temperature is not equal to the target temperature, after determining whether the intake air temperature is less than the target temperature, it further includes: when the intake air temperature is greater than the target temperature, the second intake air correction temperature is obtained according to the initial temperature of the catalyst, the target temperature, the intake air temperature, and the second parameter.

[0094] It is understandable that the second intake air correction temperature refers to the temperature after increasing the initial temperature of the catalyst. When it is determined that the intake air temperature is greater than the target temperature, the second intake air correction temperature is calculated, specifically: the second intake air correction temperature = T base +b*(T0 - T 进气 ), T base is the initial temperature of the catalyst, b is the second parameter, T 进气 is the intake air temperature, and T0 is the target temperature.

[0095] Furthermore, the intake air correction temperature is corrected by the intake air flow rate to obtain the flow rate correction temperature, including: calculating the target filtering time constant by using the preset flow rate filtering constant relationship for the intake air flow rate; obtaining the current intake air correction temperature and the previous intake air correction temperature according to the target filtering time constant and the intake air correction temperature; and performing an accumulation calculation on the current intake air correction temperature and the previous intake air correction temperature to obtain the flow rate correction temperature.

[0096] It is understandable that the preset flow rate filtering constant relationship refers to a map relationship table with the intake air flow rate as the axis and the filtering time constant as the value. After obtaining the intake air flow rate, the filtering time constant corresponding to the intake air flow rate, that is, the target filtering time constant, is calculated through the preset flow rate filtering constant relationship. The value range of the target filtering time constant is [0, 1]. The target filtering time constant represents the ratio of the current intake air correction temperature and the previous intake air correction temperature. When the intake air flow rate is larger, the influence of calculating the current intake air correction temperature is greater, the influence of the previous intake air correction temperature is smaller, and the value of α is larger. After obtaining the current intake air correction temperature and the previous intake air correction temperature, the flow rate correction temperature is calculated through the current intake air correction temperature and the previous intake air correction temperature, specifically: the flow rate correction temperature = α*T当前 = (α - 1) * T 上一次 , where α is the target filtering time constant, and T 当前 is the current intake air correction temperature, and T 上一次 is the previous intake air correction temperature.

[0097] Further, cold start temperature correction is performed on the flow correction temperature through the start flag to obtain the transient catalyst inlet temperature, including: when the start flag is the target flag, determining whether the current start time of the target vehicle is greater than or equal to the first stage time; when the current start time is greater than or equal to the first stage time, obtaining the current corrected cold start temperature; correcting the flow correction temperature through the current corrected cold start temperature to obtain the transient catalyst inlet temperature.

[0098] It can be understood that the current corrected cold start temperature refers to the set start temperature. After obtaining the start flag, it is necessary to determine whether the start flag is the target flag. The target flag is "1". If so, continue to determine whether the current start time of the target vehicle is greater than the first stage time. If so, directly set the transient catalyst inlet temperature to the current corrected cold start temperature, and the first stage time is less than the second stage time.

[0099] Further, after determining whether the current start time of the target vehicle is greater than or equal to the first stage time when the start flag is the target flag, it further includes: after the current start time is less than the first stage time, determining whether the current start time is less than the second stage time; when the current start time is less than the second stage time, calculating the flow correction temperature and the current coefficient to obtain the transient catalyst inlet temperature.

[0100] It should be understood that after the start flag is the target flag and the current start time of the target vehicle is less than the second stage time, then continue to determine whether the current start time is less than the second stage time. If so, calculate the transient catalyst inlet temperature through the flow correction temperature and the current coefficient. Specifically: transient catalyst inlet temperature = c * T 流量 + d, where c is the current coefficient, d is a constant, and T 流量 is the flow correction temperature.

[0101] Step S202, determining the transient catalyst center temperature according to the preset temperature difference and the transient catalyst inlet temperature.

[0102] It should be understood that the preset temperature difference refers to the temperature difference between the transient catalyst inlet and the transient catalyst center. The preset temperature difference is a two-dimensional relationship table with the intake air flow as the axis and the temperature difference as the value, that is, a map table representing the temperature difference between the transient catalyst inlet temperature and the transient catalyst center temperature. After obtaining the transient catalyst inlet temperature, the transient catalyst inlet temperature is calculated through the preset temperature difference to obtain the transient catalyst center temperature. The transient catalyst center temperature is higher than the transient catalyst inlet temperature, and the transient catalyst center temperature is related to the intake air volume, that is, the larger the intake air volume, the higher the transient catalyst center temperature.

[0103] In this embodiment, the initial temperature of the catalyst is corrected by the target correction parameter to obtain the transient catalyst inlet temperature; the transient catalyst center temperature is determined according to the preset temperature difference and the transient catalyst inlet temperature; since in this embodiment, the corresponding target intake air parameter and target start parameter are obtained through the target correction parameter, and then the initial temperature of the catalyst is corrected by the target intake air parameter and the target start parameter respectively to obtain the transient catalyst inlet temperature, and then the transient catalyst inlet temperature is calculated through the preset temperature difference to determine the transient catalyst center temperature, so as to effectively improve the accuracy of determining the transient catalyst center temperature.

[0104] In one embodiment, as Figure 6 described, based on the first embodiment, the third embodiment of the method for determining the catalyst deterioration time of the present invention is proposed. The step S30 includes:

[0105] Step S301, calculate the transient catalyst center temperature according to the preset catalyst deterioration time relationship to obtain the catalyst deterioration rate and the catalyst deterioration time parameter.

[0106] It can be understood that the catalyst deterioration rate refers to the degree of catalyst deterioration per unit time, that is, the greater the degree of deterioration, the faster the catalyst deterioration rate. The catalyst deterioration time parameter refers to the parameter that converts the catalyst deterioration rate into the instantaneous deterioration time. The catalyst deterioration rate and the catalyst deterioration time parameter are obtained by calculating the transient catalyst center temperature according to the preset catalyst deterioration time relationship.

[0107] Step S302, calculate the catalyst deterioration rate and the catalyst deterioration time parameter to obtain the current instantaneous deterioration time.

[0108] It should be understood that the current instantaneous deterioration time refers to the deterioration time of the catalyst at the catalyst deterioration rate. Specifically, the catalyst deterioration rate is calculated according to the catalyst deterioration time parameter to obtain the current instantaneous deterioration time. For example, the catalyst deterioration time parameter is △T, and the catalyst deterioration rate is V, then the current instantaneous deterioration time = V * △T.

[0109] Step S303: Add the previous deterioration time and the current instantaneous deterioration time to calculate the catalyst deterioration time of the target vehicle.

[0110] It can be understood that the previous deterioration time refers to the previous deterioration time of the current instantaneous deterioration. After obtaining the previous deterioration time, the previous deterioration time is added to the current instantaneous deterioration time calculated this time to obtain the catalyst deterioration time of the target vehicle. For example, if the previous deterioration time is A and the current instantaneous deterioration time is B, then the catalyst deterioration time of the target vehicle is A + B.

[0111] In this embodiment, the transient catalyst center temperature is calculated according to the preset catalyst deterioration time relationship to obtain the catalyst deterioration rate and the catalyst deterioration time parameter; the catalyst deterioration rate and the catalyst deterioration time parameter are calculated to obtain the current instantaneous deterioration time; the previous deterioration time and the current instantaneous deterioration time are added and calculated to obtain the catalyst deterioration time of the target vehicle; since this embodiment calculates the transient catalyst center temperature through the preset catalyst deterioration time relationship, then calculates the catalyst deterioration rate and the catalyst deterioration time parameter, and then adds the previous deterioration time and the current instantaneous deterioration time, it can realize determining the catalyst deterioration time through vehicle parameters without measuring the actual catalyst temperature.

[0112] In addition, an embodiment of the present invention also proposes a storage medium, on which a program for determining the catalyst deterioration time is stored. When the program for determining the catalyst deterioration time is executed by a processor, the steps of the method for determining the catalyst deterioration time as described above are implemented.

[0113] Since this storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0114] In addition, referring to Figure 7 , an embodiment of the present invention also proposes a device for determining the catalyst deterioration time. The device for determining the catalyst deterioration time includes:

[0115] An acquisition module 10, configured to acquire the initial temperature of the catalyst.

[0116] A determination module 20, configured to determine the transient catalyst center temperature according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst.

[0117] The determination module 20 is further configured to determine the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature.

[0118] In this embodiment, the initial temperature of the catalyst is obtained; the transient catalyst center temperature is determined according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst; the catalyst deterioration time of the target vehicle is determined by the preset catalyst deterioration time relationship and the transient catalyst center temperature; since in this embodiment, the transient catalyst center temperature is determined by the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst, and then the catalyst deterioration time is determined based on the preset catalyst deterioration time relationship and the transient catalyst center temperature, compared with the prior art that determines the deterioration time through the catalyst temperature measured by a temperature sensor, it is possible to determine the catalyst deterioration time through vehicle parameters and effectively improve the accuracy of determining the catalyst deterioration time.

[0119] It should be noted that the above-described workflow is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no limitation is made here.

[0120] In addition, for the technical details not described in detail in this embodiment, reference can be made to the method for determining the catalyst deterioration time provided in any embodiment of the present invention, which will not be elaborated here.

[0121] In one embodiment, the obtaining module 10 is further configured to obtain the corresponding vehicle speed, throttle pedal opening, and engine speed according to the current driving parameters of the target vehicle; calculate the initial throttle opening by calculating the throttle pedal opening and the engine speed; adjust the initial throttle opening by the vehicle speed to obtain the target throttle opening; calculate the initial temperature of the catalyst by calculating the engine speed and the target throttle opening according to the target bench performance temperature parameter.

[0122] In one embodiment, the determining module 20 is further configured to correct the initial temperature of the catalyst by the target correction parameter to obtain the transient catalyst inlet temperature; determine the transient catalyst center temperature according to the preset temperature difference and the transient catalyst inlet temperature.

[0123] In one embodiment, the determining module 20 is further configured to the target correction parameter includes a target intake parameter and a target start parameter; obtain the corresponding intake temperature and intake flow according to the target intake parameter; correct the initial temperature of the catalyst by the intake temperature to obtain the intake corrected temperature; correct the filtering time constant of the intake corrected temperature by the intake flow to obtain the flow corrected temperature; obtain the corresponding start flag according to the target start parameter; correct the flow corrected temperature by the start flag to obtain the transient catalyst inlet temperature.

[0124] In one embodiment, the determining module 20 is further configured to, when the intake air temperature is not equal to the target temperature, determine whether the intake air temperature is less than the target temperature; when the intake air temperature is less than the target temperature, obtain a first intake air correction temperature according to the initial temperature of the catalyst, the target temperature, the intake air temperature, and a first parameter.

[0125] In one embodiment, the determining module 20 is further configured to, when the intake air temperature is greater than the target temperature, obtain a second intake air correction temperature according to the initial temperature of the catalyst, the target temperature, the intake air temperature, and a second parameter.

[0126] In one embodiment, the determining module 20 is further configured to calculate the intake air flow rate through a preset flow rate filtering constant relationship to obtain a target filtering time constant; obtain a current intake air correction temperature and a previous intake air correction temperature according to the target filtering time constant and the intake air correction temperature; perform an accumulative calculation on the current intake air correction temperature and the previous intake air correction temperature to obtain a flow rate correction temperature.

[0127] In one embodiment, the correcting module 20 is further configured to, when the start flag is a target flag, determine whether the current start time of the target vehicle is greater than or equal to a first stage time; when the current start time is greater than or equal to the first stage time, obtain a current corrected cold start temperature; obtain a transient catalyst inlet temperature through the current corrected cold start temperature.

[0128] In one embodiment, after the current start time is less than the first stage time, the determining module 20 determines whether the current start time is less than a second stage time; when the current start time is less than the second stage time, calculate the flow rate correction temperature and a current coefficient to obtain a transient catalyst inlet temperature.

[0129] In one embodiment, the determining module 20 is further configured to calculate the transient catalyst center temperature according to a preset catalyst deterioration time relationship to obtain a catalyst deterioration rate and a catalyst deterioration time parameter; calculate the catalyst deterioration rate and the catalyst deterioration time parameter to obtain a current instantaneous deterioration time; perform an accumulative calculation on the previous deterioration time and the current instantaneous deterioration time to obtain the catalyst deterioration time of the target vehicle.

[0130] Other embodiments or implementation methods of the catalyst deterioration time determining device of the present invention may refer to the above method embodiments, and will not be repeated here.

[0131] In addition, it should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including that element.

[0132] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0133] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, an integrated platform workstation, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0134] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the content of the drawings, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for determining the catalyst deterioration time, characterized in that The method for determining the catalyst deterioration time includes the following steps: Obtain the initial temperature of the catalyst; Determine the transient catalyst center temperature according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst; Determine the catalyst deterioration time of the target vehicle through the preset catalyst deterioration time relationship and the transient catalyst center temperature; The determining the transient catalyst center temperature according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst, the target correction parameter includes the target intake parameter and the target start parameter, and includes: Determine the flow correction temperature according to the target intake parameter and the initial temperature of the catalyst; Obtain the corresponding start flag according to the target start parameter; Perform cold start temperature correction on the flow correction temperature through the start flag to obtain the transient catalyst inlet temperature; Determine the transient catalyst center temperature according to the preset temperature difference value and the transient catalyst inlet temperature.

2. The method for determining the catalyst deterioration time according to claim 1, characterized in that, The obtaining the initial temperature of the catalyst includes: Obtain the corresponding vehicle speed, accelerator pedal opening, and engine speed according to the current driving parameters of the target vehicle; Calculate the initial throttle opening from the accelerator pedal opening and the engine speed; Adjust the initial throttle opening through the vehicle speed to obtain the target throttle opening; Calculate the initial temperature of the catalyst according to the target bench performance temperature parameter, the engine speed, and the target throttle opening.

3. The method for determining the catalyst deterioration time according to claim 1, wherein The determining the flow correction temperature according to the target intake parameter and the initial temperature of the catalyst includes: Obtain the corresponding intake temperature and intake flow according to the target intake parameter; Correct the initial temperature of the catalyst through the intake temperature to obtain the intake correction temperature; Perform filtering time constant correction on the intake correction temperature through the intake flow to obtain the flow correction temperature.

4. The method for determining the catalyst deterioration time according to claim 3, characterized in that The correcting the initial temperature of the catalyst through the intake temperature to obtain the intake correction temperature includes: When the intake temperature is not equal to the target temperature, determine whether the intake temperature is less than the target temperature; When the intake temperature is less than the target temperature, obtain the first intake correction temperature according to the initial temperature of the catalyst, the target temperature, the intake temperature, and the first parameter.

5. The method for determining the catalyst deterioration time according to claim 4, wherein After determining whether the intake temperature is less than the target temperature when the intake temperature is not equal to the target temperature, it further includes: When the intake temperature is greater than the target temperature, obtain the second intake correction temperature according to the initial temperature of the catalyst, the target temperature, the intake temperature, and the second parameter.

6. The method for determining the catalyst deterioration time according to claim 3, wherein The performing filtering time constant correction on the intake correction temperature through the intake flow to obtain the flow correction temperature includes: Calculate the target filtering time constant through the preset flow filtering constant relationship for the intake flow; Obtain the current intake correction temperature and the previous intake correction temperature according to the target filtering time constant and the intake correction temperature; Perform cumulative calculation on the current intake correction temperature and the previous intake correction temperature to obtain the flow correction temperature.

7. The method for determining the catalyst deterioration time according to claim 3, wherein The performing cold start temperature correction on the flow correction temperature through the start flag to obtain the transient catalyst inlet temperature includes: When the startup flag is the target flag, determine whether the current startup time of the target vehicle is greater than or equal to the first-stage time; When the current startup time is greater than or equal to the first-stage time, obtain the current corrected cold startup temperature; Obtain the transient catalyst inlet temperature from the current corrected cold startup temperature.

8. The method for determining the catalyst deterioration time according to claim 7, wherein After determining whether the current startup time of the target vehicle is greater than or equal to the first-stage time when the startup flag is the target flag, it further includes: After the current startup time is less than the first-stage time, determine whether the current startup time is less than the second-stage time; When the current startup time is less than the second-stage time, calculate the flow correction temperature and the current coefficient to obtain the transient catalyst inlet temperature.

9. The method for determining the catalyst deterioration time according to any one of claims 1 to 8, characterized in that, Determining the catalyst deterioration time of the target vehicle by the preset catalyst deterioration time relationship and the transient catalyst center temperature includes: Calculate the transient catalyst center temperature according to the preset catalyst deterioration time relationship to obtain the catalyst deterioration rate and the catalyst deterioration time parameter; Calculate the catalyst deterioration rate and the catalyst deterioration time parameter to obtain the current instantaneous deterioration time; Accumulatively calculate the previous deterioration time and the current instantaneous deterioration time to obtain the catalyst deterioration time of the target vehicle.

10. A device for determining the catalyst deterioration time, characterized in that, The device for determining the catalyst deterioration time includes: An acquisition module for acquiring the initial temperature of the catalyst; A determination module for determining the transient catalyst center temperature according to the target correction parameter, the preset temperature difference, and the initial temperature of the catalyst; The determination module is further configured to determine the catalyst deterioration time of the target vehicle by the preset catalyst deterioration time relationship and the transient catalyst center temperature; The target correction parameter includes the target intake parameter and the target startup parameter; the determination module is further configured to determine the flow correction temperature according to the target intake parameter and the initial temperature of the catalyst; obtain the corresponding startup flag according to the target startup parameter; perform cold startup temperature correction on the flow correction temperature through the startup flag to obtain the transient catalyst inlet temperature; determine the transient catalyst center temperature according to the preset temperature difference and the transient catalyst inlet temperature.

11. An apparatus for determining the catalyst deterioration time, characterized in that, The device for determining the catalyst deterioration time includes: a memory, a processor, and a program for determining the catalyst deterioration time stored on the memory and executable on the processor, and the program for determining the catalyst deterioration time is configured to implement the method for determining the catalyst deterioration time according to any one of claims 1 to 9.

12. A storage medium, characterized in that, A program for determining the catalyst deterioration time is stored on the storage medium, and when the program for determining the catalyst deterioration time is executed by the processor, it implements the method for determining the catalyst deterioration time according to any one of claims 1 to 9.

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