Engine turbine outlet temperature rationality diagnosis method and device and storage medium

Abstract

The invention provides an engine turbine outlet temperature rationality diagnosis method and device and a storage medium, and belongs to the technical field of engines. The method comprises the steps that when it is detected that an engine is in a starting stage, the initial effective temperature of a turbine outlet of the engine is collected, based on the first closeness degree of the initial effective temperature relative to the first reference temperature, first rationality diagnosis is carried out, and a first diagnosis result is obtained; when it is detected that the engine is in the stable operation stage, the real-time effective temperature of a turbine outlet of the engine is collected, second rationality diagnosis is conducted according to the change degree of the real-time effective temperature relative to the initial effective temperature and the second closeness degree of the real-time effective temperature and the second reference temperature, and a second diagnosis result is obtained; and determining a rationality diagnosis result of the turbine outlet temperature of the engine according to the first diagnosis result and the second diagnosis result. The accuracy of rationality diagnosis of the temperature of the turbine outlet temperature sensor of the engine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to an engine turbine outlet temperature rationality diagnosis method, device and storage medium. BACKGROUND

[0002] Gas engines, as a kind of efficient and clean power device, have been widely used in modern transportation and energy fields. In order to ensure the stable and efficient operation of the engine and meet the strict emission regulations, the electronic control unit (ECU) needs to rely on the signals of numerous sensors for accurate control. The turbine outlet temperature (TOT) is one of the key parameters in the engine thermal management, emission control and turbine protection system. The reliability of the turbine outlet temperature sensor signal is crucial. If the sensor fails or the signal drifts, it may cause the engine to limit torque, performance degradation, and even cause component damage. Therefore, it is particularly important to diagnose the rationality of the turbine outlet temperature of the gas engine.

[0003] In related technologies, an estimated temperature at a target temperature sensor is estimated by establishing a temperature estimation model, and then temperature rationality diagnosis is performed according to the difference between the estimated temperature and the target sensor measured temperature. For example, patent CN114352394A introduces an engine exhaust temperature sensor rationality diagnosis method, which has great difficulty in establishing an engine combustion model, a heat dissipation model, an energy conversion model, etc. to calculate the turbine outlet temperature model value. The accuracy of the estimated model temperature is difficult to guarantee, which reduces the accuracy of temperature rationality diagnosis and is likely to cause false positives or false negatives of temperature rationality faults. SUMMARY

[0004] Therefore, it is necessary to provide an engine turbine outlet temperature rationality diagnosis method, device and storage medium to solve the technical problem of low accuracy of temperature rationality diagnosis in the prior art.

[0005] In order to solve the above technical problems, in a first aspect, the present application provides an engine turbine outlet temperature rationality diagnosis method, comprising: When it is detected that the engine is in a starting stage, an initial effective temperature of a turbine outlet of the engine is collected, a first rationality diagnosis is performed based on a first closeness of the initial effective temperature to a first reference temperature, and a first diagnosis result is obtained, wherein the first reference temperature represents an expected temperature of the engine turbine outlet area when the engine is in the starting stage; collecting a real-time effective temperature of a turbine outlet of the engine when detecting that the engine is in a stable running stage, performing a second rationality diagnosis according to a variation degree of the real-time effective temperature relative to the initial effective temperature and a second proximity degree of the real-time effective temperature relative to a second reference temperature, to obtain a second diagnosis result, wherein the second reference temperature is a theoretical temperature of the turbine outlet region calculated based on current running parameters of the engine; determining a rationality diagnosis result of the turbine outlet temperature of the engine according to the first diagnosis result and the second diagnosis result.

[0006] In a possible implementation, the performing the first rationality diagnosis according to the first proximity degree of the initial effective temperature relative to a first reference temperature to obtain a first diagnosis result comprises: determining an absolute value of a difference between the initial effective temperature and the first reference temperature to obtain the first proximity degree; when the first proximity degree is greater than a first preset threshold, determining that the first diagnosis result is that the turbine outlet temperature of the engine is not reasonable in the starting stage; when the first proximity degree is less than or equal to the first preset threshold, determining that the first diagnosis result is that the turbine outlet temperature of the engine is reasonable in the starting stage.

[0007] In a possible implementation, the first reference temperature is an ambient temperature when the engine is in the starting stage, an intake temperature of the engine, or a cooling water temperature of the engine; and / or, the first preset threshold is determined according to the ambient temperature and a shutdown time before the current start of the engine.

[0008] In a possible implementation, the performing the second rationality diagnosis according to the variation degree of the real-time effective temperature relative to the initial effective temperature and the second proximity degree of the real-time effective temperature relative to the second reference temperature to obtain the second diagnosis result comprises: determining an absolute value of a difference between the initial effective temperature and the real-time effective temperature to obtain the variation degree; determining an absolute value of a difference between the real-time effective temperature and the second reference temperature to obtain the second proximity degree; when the variation degree is greater than a second preset threshold and the second proximity degree is less than a third preset threshold, determining that the second diagnosis result is that the turbine outlet temperature of the engine is reasonable in the stable running stage; otherwise, determining that the second diagnosis result is that the turbine outlet temperature of the engine is not reasonable in the stable running stage.

[0009] In a possible implementation, the current operating parameter of the engine includes a rotating speed, a torque, an actual combustion efficiency, an air-fuel ratio, a cooling water temperature, a vehicle speed and a turbo waste gas bypass opening degree coefficient of the engine; the determining of the second reference temperature comprises: determining a basic temperature according to the rotating speed and the torque; determining a first temperature compensation according to the actual combustion efficiency and the air-fuel ratio, and determining a second temperature compensation according to the cooling water temperature, a current ambient temperature and the vehicle speed; determining the second reference temperature according to the turbo waste gas bypass opening degree coefficient, the basic temperature, the first temperature compensation and the second temperature compensation.

[0010] In a possible implementation, the engine is detected whether in a starting stage according to the working condition information of the engine and a first window condition; wherein the first window condition includes that a running time length in the working condition information is less than a first preset time length threshold, a cooling liquid temperature in the working condition information is lower than a first preset temperature threshold, and an exhaust flow in the working condition information is within a first preset flow range.

[0011] In a possible implementation, the engine is detected whether in a stable operating stage according to the working condition information of the engine and a second window condition; wherein the second window condition includes that a cooling water temperature in the working condition information is greater than a second water temperature limit value, an output torque in the working condition information is greater than a torque limit value, an exhaust flow in the working condition information is within a second preset flow range, and a vehicle speed in the working condition information is within a preset speed range.

[0012] In a possible implementation, the determining of the rationality diagnosis result of the turbo outlet temperature of the engine according to the first diagnosis result and the second diagnosis result comprises: if the first diagnosis result and the second diagnosis result are both reasonable, determining that the rationality diagnosis result of the turbo outlet temperature of the engine is reasonable; otherwise, determining that the rationality diagnosis result of the turbo outlet temperature of the engine is unreasonable.

[0013] In a second aspect, the present application further provides an engine turbo outlet temperature rationality diagnosis device, comprising: a first diagnosis unit configured to, when detecting that the engine is in a starting stage, collect an initial effective temperature of a turbo outlet of the engine, and perform a first rationality diagnosis based on a first closeness degree of the initial effective temperature relative to a first reference temperature to obtain a first diagnosis result, wherein the first reference temperature represents an expected temperature of an engine turbo outlet area when the engine is in the starting stage. a second diagnosis unit configured to, when detecting that the engine is in the stable operation stage, collect a real-time effective temperature of a turbine outlet of the engine, and perform a second rationality diagnosis according to a variation degree of the real-time effective temperature relative to the initial effective temperature and a second closeness degree of the real-time effective temperature to a second reference temperature, to obtain a second diagnosis result, wherein the second reference temperature is a theoretical temperature of the turbine outlet region calculated based on current operation parameters of the engine; a result determination unit configured to determine a rationality diagnosis result of the turbine outlet temperature of the engine according to the first diagnosis result and the second diagnosis result.

[0014] In a third aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein, the memory is configured to store a program; the processor is coupled to the memory, and is configured to execute the program stored in the memory, so as to implement the steps in the engine turbine outlet temperature rationality diagnosis method described in any of the implementation manners.

[0015] In a fourth aspect, the present application further provides a computer readable storage medium, configured to store a computer readable program or instruction, which is executed by a processor to implement the steps in the engine turbine outlet temperature rationality diagnosis method described in any of the implementation manners.

[0016] The present application has the following beneficial effects: The engine turbine outlet temperature rationality diagnosis method provided by the application comprises the following steps: when it is detected that the engine is in a starting stage, collecting an initial effective temperature of a turbine outlet of the engine, performing first rationality diagnosis based on a first closeness degree of the initial effective temperature relative to a first reference temperature, and obtaining a first diagnosis result, wherein the first reference temperature represents an expected temperature of the turbine outlet area of the engine when the engine is in the starting stage, and the expected temperature in the starting stage is used to cross-verify the initial effective temperature through simple and reliable cross-verification, thereby improving the accuracy of the rationality diagnosis of the turbine outlet temperature in the starting stage; when it is detected that the engine is in a stable running stage, collecting a real-time effective temperature of the turbine outlet of the engine, performing second rationality diagnosis according to a variation degree of the real-time effective temperature relative to the initial effective temperature and a second closeness degree of the real-time effective temperature relative to a second reference temperature, and obtaining a second diagnosis result, wherein the second reference temperature is a theoretical temperature of the turbine outlet area calculated based on current running parameters of the engine, thereby realizing diagnosis of double condition criteria and improving the accuracy of the rationality diagnosis of the turbine outlet temperature in the stable running stage; and determining a rationality diagnosis result of the turbine outlet temperature of the engine according to the first diagnosis result and the second diagnosis result, thereby performing rationality cross-verification on the temperature of the turbine outlet temperature sensor through staged and multi-reference-point rationality cross-verification, realizing rationality diagnosis of the temperature of the turbine outlet temperature sensor in all working conditions of the engine, and effectively reducing the false positive rate and the false negative rate of the temperature rationality diagnosis. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0018] Figure 1 An embodiment flowchart of the engine turbine outlet temperature rationality diagnosis method provided by the present application is shown in the figure. Figure 2 An embodiment structure diagram of the gas engine aftertreatment system provided by the present application is shown in the figure. Figure 3 An embodiment flowchart of the S101 in the method provided by the present application is shown in the figure. Figure 1 An embodiment flowchart of the S101 in the method provided by the present application is shown in the figure. Figure 4 An embodiment structure diagram of the engine turbine outlet temperature rationality diagnosis device provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0019] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in the description of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0021] The terms "first", "second", and the like in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0022] In this document, the term "embodiment" means that the specific features, structures or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. A person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0023] The present application provides an engine turbine outlet temperature rationality diagnosis method, device and storage medium, which are described below respectively.

[0024] The execution subject of the engine turbine outlet temperature rationality diagnosis method in the embodiments of the present application can be the engine turbine outlet temperature rationality diagnosis device provided by the embodiments of the present application, or a server device, a physical host or a user equipment (User Equipment, UE) and other types of electronic devices integrated with the engine turbine outlet temperature rationality diagnosis device, wherein the engine turbine outlet temperature rationality diagnosis device can be realized in the form of hardware or software, and the UE can be a terminal device such as a smart phone, a tablet computer, a notebook computer, a palm computer, a desktop computer or a personal digital assistant (Personal Digital Assistant, PDA).

[0025] Figure 1 An embodiment flowchart of the engine turbine outlet temperature rationality diagnosis method provided by the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the engine turbine outlet temperature rationality diagnosis method comprises the following steps. S101, when it is detected that the engine is in a starting stage, an initial effective temperature of a turbine outlet of the engine is collected, a first rationality diagnosis is performed based on a first closeness of the initial effective temperature to a first reference temperature, and a first diagnosis result is obtained, wherein the first reference temperature represents an expected temperature of an engine turbine outlet area when the engine is in the starting stage.

[0026] The inventor finds that there are generally two kinds of sensor temperature rationality diagnosis methods: one is to perform temperature rationality diagnosis on a target temperature sensor according to the measured temperatures of two or more temperature sensors, which requires additional temperature sensors and increases the cost. Therefore, the embodiment performs rationality diagnosis on the temperature of a single temperature sensor at the turbine outlet, without the need to increase temperature sensors, thereby reducing the cost.

[0027] The engine can be a gas engine. In the embodiment, only one temperature sensor is installed at the outlet of the turbine on the exhaust side of the gas engine, and no other temperature sensor is installed before and after the temperature sensor, which can reduce the cost of temperature sensor rationality diagnosis. The rationality diagnosis of the temperature of the turbine outlet of the engine in the embodiment is to perform rationality diagnosis on the temperature of the temperature sensor installed at the outlet of the turbine on the exhaust side of the gas engine. As shown in the structure diagram of the aftertreatment system of the gas engine in the embodiment, the aftertreatment system of the gas engine includes a turbine outlet temperature sensor, a gas engine, a turbine, and a three-way catalyst. Figure 2

[0028] The starting stage refers to the initial stage of the engine in the power-on running stage, i.e., the cold start stage of the engine. In this stage, the temperature of the turbine, exhaust manifold, and other components should be close to the ambient temperature because they have not been heated by high-temperature exhaust gas. The engine operating condition information and the preset window condition of the starting stage can be used for detection. For example, the electronic control unit (ECU) of the gas engine performs first power-on self-test on the turbine outlet temperature (TOT) sensor after power-on start. In order to ensure the accuracy of the stage detection, the engine operating condition information and the preset window condition of the starting stage are used for detection when the TOT sensor signal is valid. If the TOT sensor signal is invalid (such as signal drift or sticking due to sensor aging or line fault), the subsequent temperature rationality diagnosis is not performed, and the temperature rationality state is maintained as the original state.

[0029] ​The initial effective temperature refers to a temperature reading recorded in at least one start-up phase corresponding period when the turbine outlet temperature sensor signal is determined to be effective after the engine ECU is powered on. The first reference temperature represents an expected temperature of the engine turbine outlet area when the engine is in the start-up phase, that is, an independent temperature reference value which should theoretically be close to the turbine outlet temperature in the start-up phase of the engine.

[0030] The first proximity refers to an index of the proximity between the initial effective temperature and the first reference temperature, for example, it can be the absolute value of the temperature difference between the initial effective temperature and the first reference temperature. The first diagnostic result refers to the diagnosis result of whether the turbine outlet temperature is reasonable in the start-up phase, including two cases, i.e., the turbine outlet temperature is reasonable in the start-up phase and the turbine outlet temperature is unreasonable in the start-up phase.

[0031] Specifically, when it is detected that the engine is in the start-up phase, the initial effective temperature of the turbine outlet of the engine can be collected by a single temperature sensor installed in the turbine outlet area, and the first proximity of the initial effective temperature relative to the first reference temperature is calculated, and the first diagnostic result is determined according to the first proximity. In this embodiment, the expected temperature in the start-up phase is used to cross-verify the initial effective temperature simply and reliably, so that whether the turbine outlet temperature is reasonable in the start-up phase can be quickly and accurately diagnosed, the temperature sensor of the turbine outlet is quickly, accurately and reasonably evaluated, the accuracy of the reasonableness diagnosis of the turbine outlet temperature in the start-up phase is improved, the false positive rate and the false negative rate of the fault diagnosis are reduced, and for the temperature reasonableness diagnosis of a single temperature sensor, no additional temperature sensor is needed, and the diagnosis cost is saved.

[0032] S102、In the stable running phase, the real-time effective temperature of the turbine outlet of the engine is collected, and a second reasonableness diagnosis is performed according to the change degree of the real-time effective temperature relative to the initial effective temperature and the second proximity of the real-time effective temperature and the second reference temperature, to obtain a second diagnostic result, wherein the second reference temperature is a theoretical temperature of the turbine outlet area calculated based on the current running parameters of the engine.

[0033] Wherein, the stable running phase refers to the phase of the stable running condition of the engine. The real-time effective temperature refers to the temperature reading collected by the turbine outlet temperature sensor at the current time and verified for effectiveness after the engine enters the stable running condition.

[0034] The index of the closeness between the real-time effective temperature and the initial effective temperature, for example, can be the absolute value of the temperature difference between the real-time effective temperature and the initial effective temperature. The second closeness refers to the index of the closeness between the real-time effective temperature and the second reference temperature, for example, can be the absolute value of the temperature difference between the real-time effective temperature and the second reference temperature.

[0035] The second reference temperature is an estimated value of the theoretical temperature at the turbine outlet area calculated by a mathematical model based on the current operating parameters of the engine.

[0036] The second diagnostic result refers to the diagnosis of whether the turbine outlet temperature is reasonable in the stable operating condition, including two cases, i.e., the turbine outlet temperature is reasonable in the stable operating condition and the turbine outlet temperature is unreasonable in the stable operating condition.

[0037] Specifically, when it is detected that the engine is in the stable operating stage, the real-time effective temperature of the turbine outlet of the engine can be collected by a single temperature sensor installed at the turbine outlet area, and the change degree of the real-time effective temperature relative to the initial effective temperature and the second closeness of the real-time effective temperature relative to the second reference temperature can be calculated, and the second diagnostic result can be determined according to the change degree and the second closeness. In this embodiment, the temperature sensor with response delay or stuck can be effectively detected by the change degree of the real-time effective temperature relative to the initial effective temperature, and the accuracy fault such as reading drift and gain error can be effectively detected by the second closeness of the real-time effective temperature relative to the second reference temperature. By simultaneously verifying the change degree and the second closeness, the diagnosis of the double condition criterion is realized, the confidence of the second reasonableness diagnosis is enhanced, the misjudgment is minimized, and the accuracy of the reasonableness diagnosis of the turbine outlet temperature in the stable operating stage is improved.

[0038] S103, determining the reasonableness diagnostic result of the turbine outlet temperature of the engine according to the first diagnostic result and the second diagnostic result.

[0039] Specifically, the first diagnostic result and the second diagnostic result determine the reasonableness diagnostic result of the turbine outlet temperature of the engine, and the reasonableness of the temperature of the turbine outlet temperature sensor is verified by stages and multiple reference points, realizing the reasonableness diagnosis of the temperature of the turbine outlet temperature sensor in the full operating condition of the engine, and the diagnostic accuracy is high, effectively reducing the false positive rate and the false negative rate of the temperature reasonableness diagnosis.

[0040] In conclusion, the engine turbine outlet temperature rationality diagnosis method provided by the embodiment of the application collects the initial effective temperature of the turbine outlet of the engine when detecting that the engine is in the starting stage, performs first rationality diagnosis based on the first closeness degree of the initial effective temperature relative to the first reference temperature, and obtains a first diagnosis result, wherein the first reference temperature represents the expected temperature of the turbine outlet area of the engine when the engine is in the starting stage, and the expected temperature in the starting stage is used to cross-verify the initial effective temperature through simple and reliable cross-verification, thereby improving the accuracy of the rationality diagnosis of the turbine outlet temperature in the starting stage; when detecting that the engine is in the stable running stage, the real-time effective temperature of the turbine outlet of the engine is collected, second rationality diagnosis is performed according to the change degree of the real-time effective temperature relative to the initial effective temperature and the second closeness degree of the real-time effective temperature relative to the second reference temperature, and a second diagnosis result is obtained, wherein the second reference temperature is a theoretical temperature of the turbine outlet area calculated based on the current running parameter of the engine, the diagnosis of the double condition criteria is realized, and the accuracy of the rationality diagnosis of the turbine outlet temperature in the stable running stage is improved; the rationality diagnosis result of the turbine outlet temperature of the engine is determined according to the first diagnosis result and the second diagnosis result, the rationality cross-verification of the temperature of the turbine outlet temperature sensor is performed through staged and multi-reference-point, the rationality diagnosis of the temperature of the turbine outlet temperature sensor is realized in the full working condition of the engine, the diagnosis accuracy is high, and the false positive rate and the false negative rate of the temperature rationality diagnosis are effectively reduced.

[0041] In some embodiments of the application, as shown in Figure 3 Step S101 comprises: S201, determining the absolute value of the difference between the initial effective temperature and the first reference temperature to obtain the first closeness degree; S202, when the first closeness degree is greater than a first preset threshold, determining that the first diagnosis result is that the turbine outlet temperature of the engine is not reasonable in the starting stage; S203, when the first closeness degree is less than or equal to the first preset threshold, determining that the first diagnosis result is that the turbine outlet temperature of the engine is reasonable in the starting stage.

[0042] The absolute value of the difference between the initial effective temperature T0 and the first reference temperature T1, that is, the first closeness degree, is |T1-T0|.

[0043] Specifically, when the first closeness degree is greater than the first preset threshold, it indicates that there is a large deviation between the measured value of the turbine outlet temperature sensor and the expected reference value when the engine is in the starting stage, and thus it is determined that the first diagnosis result is that the turbine outlet temperature of the engine is unreasonable in the starting stage; when the first closeness degree is less than or equal to the first preset threshold, it indicates that the deviation between the measured value of the turbine outlet temperature sensor and the expected reference value is small when the engine is in the starting stage, which is consistent with the case that the reading of the turbine outlet temperature sensor is reasonable when the engine is in the starting stage, and thus it is determined that the first diagnosis result is that the turbine outlet temperature of the engine is reasonable in the starting stage. Understandably, the embodiment realizes rapid and accurate diagnosis of the reasonableness of the turbine outlet temperature in the starting stage through the judgment method of the quantitative ratio.

[0044] In some embodiments of the present application, the first reference temperature is the ambient temperature when the engine is in the starting stage, the intake temperature of the engine or the cooling water temperature of the engine; and / or, the first preset threshold is determined according to the ambient temperature and the stop time before the current start of the engine.

[0045] Wherein, the ambient temperature can be read in advance from the ambient temperature sensor of the vehicle, which can directly reflect the cold and hot state of the environment where the turbine is located. The intake temperature can be read in advance from the intake temperature sensor of the engine, and after the vehicle is stationary for a period of time, the intake temperature is highly related to the ambient temperature. The engine cooling water temperature can be read in advance from the engine coolant temperature sensor, and after a long time of immersion in the vehicle, the cooling water temperature can be used as the first reference temperature at the moment of cold start.

[0046] Specifically, the first reference temperature can be the ambient temperature when the engine is in the starting stage, the intake temperature of the engine or the cooling water temperature of the engine, which realizes determination of the first reference temperature from multiple data sources, enhances the fault tolerance and availability of the system; and / or, the longer the stop time is, the closer the turbine outlet temperature is to the ambient temperature, and thus the longer the stop time is, the smaller the first preset threshold is; when the ambient temperature is extremely low or extremely high, the first preset threshold can be adjusted accordingly. The first preset threshold is dynamically determined according to the ambient temperature and the stop time, so that the reasonableness diagnosis can adapt to different use scenarios.

[0047] In some embodiments of the present application, step S102 comprises: S301, determining the absolute value of the difference between the initial effective temperature and the real-time effective temperature to obtain the change degree; S302, determining the absolute value of the difference between the real-time effective temperature and the second reference temperature to obtain the second closeness degree; S303, if the change degree is greater than a second preset threshold and the second closeness degree is less than a third preset threshold, determining that the second diagnosis result is that the turbine outlet temperature of the engine is reasonable in the stable running stage. S304, otherwise, determining that the second diagnosis result is that the turbine outlet temperature of the engine is unreasonable in the stable running stage.

[0048] The second preset threshold is a threshold value for judging whether the change degree of the real-time effective temperature relative to the initial effective temperature is large enough, which can be flexibly selected according to the actual scene. The third preset threshold is a threshold value for judging the closeness degree between the real-time effective temperature and the second reference temperature, which can be flexibly selected according to the actual scene.

[0049] The absolute value |T-T0| of the difference between the initial effective temperature T0 and the real-time effective temperature T is the change degree. The absolute value |T-T2| of the difference between the real-time effective temperature T and the second reference temperature T2 is the second closeness degree.

[0050] Specifically, when the change degree is greater than the second preset threshold and the second closeness degree is less than the third preset threshold, it indicates that the temperature rise of the engine in the stable running stage conforms to the physical expectation, and the current reading is highly consistent with the second reference temperature, proving that the sensor response is accurate. Therefore, it is determined that the second diagnosis result is that the turbine outlet temperature of the engine is reasonable in the stable running stage. If either the change degree or the second closeness degree does not satisfy the corresponding threshold, it is determined that the second diagnosis result is that the turbine outlet temperature of the engine is reasonable in the stable running stage. Understandably, the embodiment realizes accurate diagnosis of the reasonableness of the turbine outlet temperature of the engine in the stable running stage in the stable running condition by double-checking logic and the reference corresponding to the second reference temperature.

[0051] In some embodiments of the application, the current running parameters of the engine include the engine speed, torque, actual combustion efficiency, air-fuel ratio, cooling water temperature, vehicle speed and turbine exhaust bypass opening coefficient; the determination of the second reference temperature comprises: S401, determining a base temperature according to the engine speed and torque; S402, determining a first temperature compensation amount according to the actual combustion efficiency and air-fuel ratio, and determining a second temperature compensation amount according to the cooling water temperature, current environment temperature and vehicle speed; S403, determining the second reference temperature according to the turbine exhaust bypass opening coefficient, base temperature, first temperature compensation amount and second temperature compensation amount.

[0052] Wherein, the basic temperature refers to a turbine outlet theoretical temperature value calculated based on engine speed and torque when the engine is in a stable operating condition. The first temperature compensation amount refers to an amount of correcting the basic temperature according to the quality and efficiency of the actual combustion process of the engine. The second temperature compensation amount refers to an amount of correcting the basic temperature according to the overall thermal management state of the engine and the vehicle operating environment.

[0053] Specifically, a first MAP table of historical engine speed, historical torque and historical basic temperature can be pre-configured, and the basic temperature Tb is determined based on the first MAP table and the speed and torque in the current operating parameters of the engine. A second MAP table of historical actual combustion efficiency, historical air-fuel ratio and historical first temperature compensation amount of the engine is pre-configured, and the first temperature compensation amount AT1 is determined based on the second MAP table and the actual combustion efficiency and air-fuel ratio in the current operating parameters of the engine. A third MAP table of historical cooling water temperature, historical current ambient temperature, historical vehicle speed and historical second temperature compensation amount of the engine is pre-configured, and the second temperature compensation amount AT2 is determined based on the third MAP table and the cooling water temperature, current ambient temperature and vehicle speed in the current operating parameters of the engine. Then, according to the turbine waste gas bypass opening degree coefficient a, the basic temperature Tb, the first temperature compensation amount AT1 and the second temperature compensation amount AT2, the second reference temperature T2 is calculated according to the formula T2=(Tb+AT1+AT2)·a. In this embodiment, based on the current operating parameters of the engine, the core factors affecting the exhaust temperature in the power source (combustion), load (speed / torque) and environment (heat dissipation) are comprehensively considered, so that the calculated second reference temperature is close to the real physical process, and the accuracy of the second reference temperature calculation is improved.

[0054] In some embodiments of the application, further comprising: S501, detecting whether the engine is in a starting stage according to the operating condition information of the engine and a first window condition; wherein the first window condition includes that the running time in the operating condition information is less than a first preset time threshold; the coolant temperature in the operating condition information is lower than a first preset temperature threshold; and the exhaust flow in the operating condition information is within a first preset flow range.

[0055] Specifically, by accurately defining the first window condition, the accuracy of the starting stage detection can be improved, and the execution of the incorrect rationality diagnosis logic at the wrong time point is avoided, and the reliability of the turbine outlet temperature rationality diagnosis is improved.

[0056] It is worth noting that when the engine meets the above-mentioned first window condition, it is diagnosed once in one power-on cycle, that is, the temperature rationality diagnosis is performed at the initial stage of the engine power-on operation, which is used to diagnose the turbine outlet temperature sensor temperature high or low fault.

[0057] In some embodiments of the present application, further comprising: S601, detecting whether the engine is in a stable running stage according to the working condition information of the engine and a second window condition; wherein the second window condition comprises that the cooling water temperature in the working condition information is greater than a second water temperature limit value; the output torque in the working condition information is greater than a torque limit value; the exhaust flow in the working condition information is within a second preset flow range; and the vehicle speed in the working condition information is within a preset speed range.

[0058] Specifically, by accurately defining the second window condition, the accuracy of the stable running stage detection can be improved, and the execution of the false rationality diagnosis logic at the wrong time point is avoided, thereby improving the reliability of the turbine outlet temperature rationality diagnosis.

[0059] It is worth noting that as long as the above-mentioned second window condition is met during the stable running of the engine, the turbine outlet temperature rationality diagnosis can be performed, and complete diagnosis covering the full working condition of the engine is realized.

[0060] In some embodiments of the present application, step S103 comprises: S701, if the first diagnosis result and the second diagnosis result are both reasonable, determining that the rationality diagnosis result of the turbine outlet temperature of the engine is reasonable; S702, otherwise, determining that the rationality diagnosis result of the turbine outlet temperature of the engine is unreasonable.

[0061] Specifically, if the first diagnosis result and the second diagnosis result are both reasonable, it is determined that the rationality diagnosis result of the turbine outlet temperature of the engine is reasonable, and if there is an unreasonable diagnosis result in the first diagnosis result and the second diagnosis result, it is determined that the rationality diagnosis result of the turbine outlet temperature of the engine is unreasonable. It can be understood that in the present embodiment, the rationality diagnosis result of the turbine outlet temperature of the engine is determined according to the first diagnosis result and the second diagnosis result, complete cycle coverage rationality diagnosis is realized, and the accuracy of the rationality diagnosis is improved through double verification.

[0062] In order to better implement the engine turbine outlet temperature rationality diagnosis method in the embodiments of the present application, on the basis of the engine turbine outlet temperature rationality diagnosis method, corresponding to the engine turbine outlet temperature rationality diagnosis method, as shown in the engine turbine outlet temperature rationality diagnosis method, the present application also provides an engine turbine outlet temperature rationality diagnosis device. Figure 4 As shown in the engine turbine outlet temperature rationality diagnosis method, the present application also provides an engine turbine outlet temperature rationality diagnosis device 400, which comprises: The first diagnosis unit 401 is configured to, when detecting that the engine is in a starting stage, collect an initial effective temperature of a turbine outlet of the engine, perform first rationality diagnosis based on a first closeness of the initial effective temperature to a first reference temperature, and obtain a first diagnosis result, where the first reference temperature represents an expected temperature of the turbine outlet region of the engine when the engine is in the starting stage. The second diagnosis unit 402 is configured to, when detecting that the engine is in a stable running stage, collect a real-time effective temperature of the turbine outlet of the engine, perform second rationality diagnosis according to a variation degree of the real-time effective temperature to the initial effective temperature and a second closeness of the real-time effective temperature to a second reference temperature, and obtain a second diagnosis result, where the second reference temperature is a theoretical temperature of the turbine outlet region calculated based on current running parameters of the engine. The result determination unit 403 is configured to determine a rationality diagnosis result of the turbine outlet temperature of the engine according to the first diagnosis result and the second diagnosis result.

[0063] The engine turbine outlet temperature rationality diagnosis apparatus 400 provided by the above embodiment can implement the technical solutions described in the above engine turbine outlet temperature rationality diagnosis method embodiments, and the principles of implementation of the above modules or units can be referred to the corresponding content in the above engine turbine outlet temperature rationality diagnosis method embodiments, which will not be described here again.

[0064] Correspondingly, the embodiment of the present application also provides a computer readable storage medium, which is used to store computer readable programs or instructions, and the programs or instructions are executed by a processor to implement the steps or functions in the engine turbine outlet temperature rationality diagnosis method provided by the above method embodiments.

[0065] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program to instruct related hardware (such as a processor, a controller, etc.) to complete. The computer program can be stored in a computer readable storage medium. The computer readable storage medium includes a magnetic disk, an optical disk, a read-only memory, a random access memory, etc.

[0066] The engine turbine outlet temperature rationality diagnosis method, apparatus and storage medium provided by the present application are described in detail above, and the principles and implementation manners of the present application are described by using specific examples. The above embodiment is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for diagnosing the rationality of engine turbine outlet temperature, characterized in that, include: When the engine is detected to be in the start-up phase, the initial effective temperature of the turbine outlet of the engine is collected. Based on the first degree of closeness of the initial effective temperature to a first reference temperature, a first rationality diagnosis is performed to obtain a first diagnosis result, wherein the first reference temperature characterizes the expected temperature of the turbine outlet region of the engine when the engine is in the start-up phase. When the engine is detected to be in a stable operating phase, the real-time effective temperature of the turbine outlet of the engine is collected. Based on the degree of change of the real-time effective temperature relative to the initial effective temperature and the degree of closeness of the real-time effective temperature to the second reference temperature, a second rationality diagnosis is performed to obtain a second diagnosis result. The second reference temperature is the theoretical temperature of the turbine outlet area calculated based on the current operating parameters of the engine. The reasonableness diagnosis result of the turbine outlet temperature of the engine is determined based on the first diagnostic result and the second diagnostic result.

2. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, The first reasonableness diagnosis based on the first degree of closeness of the initial effective temperature to the first reference temperature, and the resulting first diagnostic result, includes: The absolute value of the difference between the initial effective temperature and the first reference temperature is determined to obtain the first degree of closeness; When the first proximity is greater than the first preset threshold, the first diagnostic result is determined to be that the turbine outlet temperature of the engine is unreasonable during the startup phase; When the first proximity is less than or equal to the first preset threshold, the first diagnostic result is determined to be that the turbine outlet temperature of the engine is reasonable during the startup phase.

3. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 2, characterized in that, The first reference temperature is the ambient temperature when the engine is in the start-up phase, the engine's intake air temperature, or the engine's coolant temperature; and / or, The first preset threshold is determined based on the ambient temperature and the downtime of the engine before this start-up.

4. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, The second reasonableness diagnosis is performed based on the degree of change of the real-time effective temperature relative to the initial effective temperature and the degree of closeness of the real-time effective temperature to the second reference temperature, to obtain a second diagnostic result, including: The degree of change is obtained by determining the absolute value of the difference between the initial effective temperature and the real-time effective temperature; The absolute value of the difference between the real-time effective temperature and the second reference temperature is determined to obtain the second degree of closeness; If the degree of change is greater than the second preset threshold and the second degree of proximity is less than the third preset threshold, then the second diagnostic result is determined to be that the turbine outlet temperature of the engine is reasonable during the stable operation phase. Otherwise, the second diagnostic result is determined to be that the turbine outlet temperature of the engine is unreasonable during the stable operation phase.

5. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, The engine's current operating parameters include engine speed, torque, actual combustion efficiency, air-fuel ratio, coolant temperature, vehicle speed, and turbine exhaust bypass opening coefficient. The steps for determining the second reference temperature include: The base temperature is determined based on the stated rotational speed and torque. The first temperature compensation amount is determined based on the actual combustion efficiency and air-fuel ratio, and the second temperature compensation amount is determined based on the coolant temperature, the current ambient temperature, and the vehicle speed. The second reference temperature is determined based on the turbine exhaust bypass opening coefficient, the base temperature, the first temperature compensation amount, and the second temperature compensation amount.

6. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, Also includes: Based on the engine's operating condition information and the first window conditions, it is detected whether the engine is in the start-up phase; wherein, the first window conditions include the running time in the operating condition information being less than a first preset time threshold; the coolant temperature in the operating condition information being lower than a first preset temperature threshold; and the exhaust flow rate in the operating condition information being within a first preset flow rate range.

7. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, Also includes: Based on the engine's operating condition information and the second window conditions, detect whether the engine is in a stable operating phase; The second window conditions include: the cooling water temperature in the operating condition information is greater than the second water temperature limit; the output torque in the operating condition information is greater than the torque limit; the exhaust flow rate in the operating condition information is within the second preset flow rate range; and the vehicle speed in the operating condition information is within the preset speed range.

8. The method for diagnosing the rationality of engine turbine outlet temperature according to claim 1, characterized in that, The step of determining the reasonableness diagnosis result of the turbine outlet temperature of the engine based on the first diagnostic result and the second diagnostic result includes: If both the first and second diagnostic results are reasonable, the diagnostic result for determining the reasonableness of the engine's turbine outlet temperature is reasonable. Otherwise, the diagnosis of the reasonableness of the engine turbine outlet temperature is deemed unreasonable.

9. A device for diagnosing the rationality of engine turbine outlet temperature, characterized in that, include: The first diagnostic unit is used to collect the initial effective temperature of the turbine outlet of the engine when the engine is detected to be in the start-up phase, and to perform a first rationality diagnosis based on the first degree of closeness of the initial effective temperature to a first reference temperature to obtain a first diagnostic result, wherein the first reference temperature characterizes the expected temperature of the turbine outlet region of the engine when the engine is in the start-up phase. The second diagnostic unit is used to collect the real-time effective temperature of the turbine outlet of the engine when the engine is detected to be in a stable operating phase, and to perform a second rationality diagnosis based on the degree of change of the real-time effective temperature relative to the initial effective temperature and the second degree of closeness of the real-time effective temperature to the second reference temperature, and to obtain a second diagnostic result, wherein the second reference temperature is the theoretical temperature of the turbine outlet area calculated based on the current operating parameters of the engine. The result determination unit is used to determine the reasonableness diagnosis result of the turbine outlet temperature of the engine based on the first diagnostic result and the second diagnostic result.

10. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, can perform the steps in the engine turbine outlet temperature rationality diagnosis method according to any one of claims 1 to 8.

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