Abnormality detection method, system, device and storage medium applied to engine system

Abstract

The application provides an abnormality detection method, system, device and storage medium applied to an engine system, and belongs to the technical field of engine control. The method comprises the following steps: obtaining a first supercharging pressure difference and a second supercharging pressure difference based on a first target supercharging pressure, a second target supercharging pressure and an actual supercharging pressure; when the time when the engine system simultaneously satisfies all preset conditions exceeds a preset time threshold, adjusting a spark angle efficiency based on the first supercharging pressure difference, the second supercharging pressure difference, a predicted supercharging pressure difference and the first target supercharging pressure and the second target supercharging pressure when it is determined that a first type of supercharging pressure overhigh severe fault occurs in an engine system in a driving cycle, and updating a sampling period in the driving cycle. Through the technical scheme in the application, the fault degree of the supercharging pressure overhigh fault can be accurately detected.

Description

Technical Field

[0001] This invention relates to the field of engine control technology, and in particular to an anomaly detection method, system, device, and storage medium for engine systems. Background Technology

[0002] Hybrid engines are the mainstream type of engine on the market, and EGR technology is a key technology for achieving high thermal efficiency. The gas pressure on both sides of the EGR valve (inlet and outlet) is a crucial input for EGR rate control, determining the estimation of exhaust gas flow and the accuracy of EGR valve opening control, thus affecting the precision of the EGR rate. Therefore, it is necessary to promptly check whether the EGR valve inlet gas pressure signal is normal to avoid affecting EGR rate control and causing adverse effects on engine performance. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes an anomaly detection method, system, device and storage medium for engine systems.

[0004] In a first aspect, embodiments of the present invention provide an anomaly detection method applied to an engine system, the method comprising:

[0005] The first target boost pressure, the second target boost pressure, and the actual boost pressure are obtained. The first boost pressure difference is obtained based on the first target boost pressure and the actual boost pressure, and the second boost pressure difference is obtained based on the second target boost pressure and the actual boost pressure. The second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value.

[0006] Real-time monitoring of whether the engine system simultaneously meets all preset conditions, and when the time for the engine system to simultaneously meet all preset conditions exceeds a preset time threshold, reading the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and reading the second boost pressure difference of the most recent consecutive sampling cycles to form a second array;

[0007] Calculate the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods of the first array;

[0008] Based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, and the first target boost pressure and the second target boost pressure, a boost pressure fault is determined.

[0009] When a severe fault of excessive boost pressure (Type I) is detected in the engine system during a driving cycle, the ignition angle efficiency is adjusted, and the sampling period V1 is updated during that driving cycle.

[0010] In some embodiments, all the preset conditions include:

[0011] Condition 1: The fluctuation of the target intake pressure does not exceed the first preset fluctuation threshold.

[0012] Condition 2: The engine intake air volume has not reached the engine's maximum air volume;

[0013] Condition 3: The fluctuation of the throttle opening does not exceed the second preset fluctuation threshold.

[0014] Condition 4: Neither the first target boost pressure nor the second target boost pressure has decreased;

[0015] Condition 5: The rate of change of engine speed is not lower than the first preset rate of change value;

[0016] Condition 6: The rate of change of cylinder intake air density is not lower than the second preset rate of change value;

[0017] Condition 7: The engine is not shut off from fuel;

[0018] Condition 8: The engine did not experience knocking or pre-ignition;

[0019] Condition 9: Engine exhaust temperature does not exceed the preset exhaust temperature threshold;

[0020] Condition 10: No component failures have occurred in the intake system.

[0021] In some embodiments, the estimated boost pressure difference corresponding to the first boost pressure difference in any of the first V1 sampling periods in the first array is expressed as:

[0022]

[0023] in, (i=0,1,2,……,V1-1) represents the first boost pressure difference in any of the first V1 sampling periods in the first array. For trend filtering time, The time interval between adjacent sampling periods. This is the estimated boost pressure difference corresponding to the first boost pressure difference.

[0024] In some embodiments, the process of determining the boost pressure fault includes:

[0025] The difference between any first boost pressure difference and the corresponding estimated boost pressure difference under the same sampling period is taken as the first difference;

[0026] The difference between any second boost pressure difference and the corresponding first boost pressure difference under the same sampling period is taken as the second difference;

[0027] The proportion of the sampling period corresponding to the first target boost pressure with the first difference being greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the first proportion.

[0028] The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the first difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the second proportion;

[0029] The proportion of the sampling period corresponding to the first target boost pressure when the second difference is greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the third proportion.

[0030] The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the second difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the fourth proportion;

[0031] If in the first V1 sampling periods, each first difference and each second difference are not less than 0, and the first proportion exceeds the preset proportion threshold and the third proportion is greater than or equal to the first proportion, then the first type of severe fault of excessive boost pressure is considered to have occurred.

[0032] If, in the first V1 sampling periods, there are values ​​less than 0 and values ​​not less than 0 in the first difference, but each second difference is not less than 0, and the first proportion exceeds the preset proportion threshold, then a moderate fault of excessive boost pressure is considered to have occurred.

[0033] If in the first V1 sampling periods, each first difference is not less than 0, but there are second differences that are less than 0 and not less than 0, and the first proportion exceeds the preset proportion threshold, then a minor fault of excessive boost pressure is considered to have occurred.

[0034] If in the first V1 sampling periods, each first difference and each second difference are less than 0, and the second proportion exceeds the preset proportion threshold and the fourth proportion is greater than or equal to the second proportion, then the second type of severe fault with excessive boost pressure is considered to have occurred.

[0035] In some embodiments, the process of determining the boost pressure fault further includes:

[0036] If no one of the following faults occurs in the first V1 sampling periods: mild fault due to excessive boost pressure, moderate fault due to excessive boost pressure, severe fault due to excessive boost pressure, or mild fault due to excessive boost pressure (or the second type of excessive boost pressure), then it is considered that no fault has occurred.

[0037] In some embodiments, when a severe fault of excessive boost pressure (Type I) is determined to have occurred in the engine system during a driving cycle, adjusting the ignition angle efficiency and updating the sampling period V1 during that driving cycle includes:

[0038] If a severe fault of excessive boost pressure (Type I) is determined to have occurred in the driving cycle, the ignition angle efficiency and the first target boost pressure are reduced. At the same time, the target opening of the turbine actuator in item D is updated, and the sampling period V1 is subtracted from the first preset period threshold to obtain the updated sampling period V1.

[0039] In some embodiments, it also includes:

[0040] If a severe fault of excessive boost pressure (Type II) is determined to have occurred in the driving cycle, the second target boost pressure is increased, and the first target boost pressure is increased based on the increased second target boost pressure. The sampling period V1 is then added to the fourth preset period threshold as the updated sampling period V1.

[0041] Secondly, embodiments of the present invention provide an anomaly detection system applied to an engine system, the system comprising:

[0042] The acquisition module is used to acquire the first target boost pressure, the second target boost pressure, and the actual boost pressure; to obtain the first boost pressure difference based on the first target boost pressure and the actual boost pressure; and to obtain the second boost pressure difference based on the second target boost pressure and the actual boost pressure. The second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value.

[0043] The monitoring module is used to monitor in real time whether the engine system meets all preset conditions at the same time. When the time for the engine system to meet all preset conditions at the same time exceeds a preset time threshold, it reads the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and reads the second boost pressure difference of the most recent consecutive sampling cycles to form a second array.

[0044] The calculation module is used to calculate the estimated boost pressure difference corresponding to the first boost pressure difference of the first V1 sampling periods in the first array, respectively;

[0045] The determination module is used to determine the boost pressure fault based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, the first target boost pressure, and the second target boost pressure.

[0046] The execution module is used to adjust the ignition angle efficiency and update the sampling period V1 in the driving cycle when the engine system is determined to have a severe fault of excessive boost pressure of type I in a driving cycle.

[0047] Thirdly, embodiments of the present invention provide an electronic device, the electronic device comprising:

[0048] At least one processor; and a memory communicatively connected to the at least one processor;

[0049] The memory stores a computer program that can be executed by at least one processor, such that the at least one processor is able to perform the steps of the method according to any embodiment of the present invention.

[0050] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the steps of a method according to any embodiment of the present invention.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] The anomaly detection method for engine systems provided by this invention first obtains a first boost pressure difference and a second boost pressure difference based on a first target boost pressure, a second target boost pressure, and the actual boost pressure. Then, when the time for the engine system to simultaneously meet all preset conditions exceeds a preset time threshold, the boost pressure fault situation occurring in the engine system during a driving cycle is determined based on the first boost pressure difference, the second boost pressure difference, the estimated boost pressure difference, the first target boost pressure, and the second target boost pressure. Finally, according to the boost pressure fault situation occurring in the engine system during a driving cycle, a corresponding processing strategy is executed, and the sampling period is updated in that driving cycle. Through the technical solution of this invention, the severity of the excessive boost pressure fault can be accurately detected. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only preferred embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A schematic diagram of an engine system provided in an embodiment of the present invention;

[0055] Figure 2 This is a flowchart illustrating an anomaly detection method for an engine system provided in an embodiment of the present invention.

[0056] Figure 3 A flowchart illustrating a method for determining a boost pressure malfunction, provided as an embodiment of the present invention;

[0057] Figure 4 This is a schematic diagram of the structure of an anomaly detection system applied to an engine system, provided by an embodiment of the present invention.

[0058] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0061] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0062] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0063] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0064] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0065] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0066] Before introducing the technical solution of this application, it should be noted that the following solutions exist in the prior art for fault diagnosis of engine systems:

[0067] 1) The actuator's responsiveness is determined by comparing the rate of change of the slow response state under dynamic conditions using the time integral rate of change. A longer slow response time under dynamic conditions indicates a responsiveness diagnostic fault. However, this scheme uses a general fault detection threshold, resulting in low diagnostic accuracy.

[0068] 2) This approach involves directing compressed air through the EGR passage housing the EGR valve while the vehicle is in the ignition-off state, and indicating EGR valve deterioration based on estimated changes in EGR pressure as the EGR valve position changes. However, this method requires the use of compressed air via an electric supercharger to perform the diagnostic work, adding extra cost.

[0069] Based on this, the technical solution of this application aims to at least solve the technical defects existing in the prior art.

[0070] Figure 1 This is a schematic diagram of the structure of an engine system provided in an embodiment of the present invention, as shown below. Figure 1As shown, an engine system generally includes an air filter 1; a mixing valve 2 connected to the air filter, configured to regulate the pressure at the outlet of the EGR valve 10, increasing the pressure difference across the EGR valve 10, with two airflow passages extending from the mixing valve 2; a compressor 3 connected to one of the airflow passages of the mixing valve 2; a throttle valve 4 connected to the compressor 3, wherein the throttle valve 4 has a boost temperature and pressure sensor at its inlet and an intake air temperature and pressure sensor at its outlet, and the throttle valve 4 body has a position sensor and an actuator; an engine 5 connected to the throttle valve 4, configured to compress fresh air for boosting; a turbine 6 connected to the engine 5, configured to control the opening of the exhaust bypass valve; a catalytic converter 7 connected to the turbine 6; and a gasline particulate filter connected to the catalytic converter 7. Filter (GPF) 8; EGR cooler 9 installed on another airflow path of mixing valve 2, configured to receive and cool the exhaust gas output from particulate filter 8, thereby increasing exhaust gas flow rate; EGR valve 10 connected at one end to EGR cooler 9 and at the other end to mixing valve 2, configured to control the exhaust gas flow rate entering cylinder; temperature sensor 11 installed between EGR valve 10 and EGR cooler 9, configured to detect the exhaust gas temperature entering EGR valve 10; differential pressure sensor 12 connected to EGR valve 10 (including a pressure sensor capable of determining the inlet pressure and a pressure sensor capable of determining the outlet pressure), configured to detect the pressure at the inlet and outlet of EGR valve 10.

[0071] The working state of the mixing valve 2, the particulate filter 8, and the EGR valve 10 directly affects the EGR rate of the entire engine system. Therefore, the mixing valve 2, the particulate filter 8, and the EGR valve 10 together constitute the EGR subsystem within the engine system.

[0072] Figure 2 This is a flowchart illustrating an anomaly detection method for an engine system provided by an embodiment of the present invention. This method is particularly suitable for scenarios involving the verification of the EGR valve inlet pressure signal of an EGR system. This method can be executed by an anomaly detection system applied to an engine system. This system can be implemented in software and / or hardware and can be configured in an electronic device.

[0073] like Figure 2 As shown, the method specifically includes:

[0074] S1, obtain the first target boost pressure, the second target boost pressure and the actual boost pressure, obtain the first boost pressure difference based on the first target boost pressure and the actual boost pressure, and obtain the second boost pressure difference based on the second target boost pressure and the actual boost pressure; wherein, the second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value.

[0075] The second target boost pressure in the Nth sampling period before filtering is expressed as:

[0076]

[0077] in, The second target boost pressure is the Nth sampling period before filtering. for The second target boost pressure of the previous sampling period, The optimized target boost pressure for the Nth sampling period. The time interval between adjacent sampling periods. This is the reaction time for gas to enter the throttle valve inlet from the compressor outlet of the turbocharger.

[0078] The optimized second target boost pressure in the Nth sampling period is expressed as:

[0079]

[0080] in, The second target boost pressure is defined as the optimized pressure in the Nth sampling period, where k is the filter coefficient. For example, the filter coefficient can be set to 0.02.

[0081] In addition, reaction time Experiments revealed that the engine speed n, the intake air density rho of the fresh air entering the cylinder, and the opening of the turbocharger (turbine) can all influence the combustion process. The ratio of throttle outlet pressure to inlet pressure (throttle front-to-rear pressure ratio) and the first target boost pressure. A joint decision.

[0082] 1) When the throttle is fully open (throttle front-to-rear pressure ratio greater than 0.98), based on engine speed n, intake air density rho, and turbocharger (turbine) opening... Determine reaction time , represented as:

[0083]

[0084] in, Based on reaction time, and This is a correction factor for reaction time. For example, under fixed test conditions, with the throttle fully open, the engine speed is 1000 rpm, the intake air density (rho) is 400 mgpl, and the turbocharger actuator (turbine) opening is... When it is 50%, the baseline reaction time is obtained. Take 55ms and calibrate it by adjusting different operating conditions. .

[0085] 2) When the throttle is not fully open (throttle front-to-rear pressure ratio not greater than 0.98), based on engine speed n, intake air density rho, and throttle front-to-rear pressure ratio... Determine , represented as:

[0086]

[0087] in, Based on reaction time, and This is a correction factor for reaction time. For example, under fixed test conditions, with the throttle fully open, the engine speed is 1000 rpm, the intake air density (rho) is 400 mgpl, and the throttle front-to-rear pressure ratio... When it is 50%, the baseline reaction time is obtained. Take 56ms, and calibrate by adjusting different operating conditions. .

[0088] It should be noted that the target boost pressure refers to the target value of a boost control system. Optimizing the control of the target boost pressure improves the stability of the boost closed-loop control and the accuracy of the EGR response. The actual boost pressure refers to the actual value of a boost control system. With both the target and actual values, the actual value is controlled to follow the target value based on closed-loop control. In boost closed-loop control, the boost actuator is actively controlled to achieve the following between the actual and target boost pressures. However, in boost non-closed-loop control, the opening of the boost actuator is not actively controlled.

[0089] Specifically, in some embodiments, the method for obtaining the first target boost pressure can be found in Chinese Patent Publication No. CN119491778A. Only a portion of the content for obtaining the target boost pressure is shown here, as follows:

[0090] When the boosting closed-loop enable condition is met, the boosting closed-loop enable is entered. The filter EGR rate characteristic coefficient after the first-order low-pass filter is obtained according to the filter time and EGR rate characteristic coefficient. The target boosting pressure without dynamic optimization is calculated based on the currently disclosed target boosting pressure, the EGR rate characteristic coefficient and the filter EGR rate characteristic coefficient.

[0091] The target boost pressure that was not dynamically optimized is dynamically optimized based on the actual boost pressure read in real time, so as to obtain the target boost pressure after dynamic optimization.

[0092] The dynamically optimized target boost pressure is the first target boost pressure obtained in this technical solution, denoted as... .

[0093] Specifically, in some embodiments, regarding the second target boost pressure, due to the hysteresis characteristic of the boost system, after setting the boost setpoint for the first target boost pressure, the intake airflow will not change instantaneously, and the manifold pressure needs a certain amount of time to follow suit. That is, from boost control to the response of the throttle pressure, the intake airflow needs time. Only a response can achieve a change in pressure. The essence of the second target boost pressure is a dynamically optimized target pressure corrected based on dynamic measurements of the system, used to adapt to the response lag of the boost system itself.

[0094] In bench testing, when the relative error between the boost pressure and the first target boost pressure is within a preset error threshold and the boost pressure converges and stabilizes, the measured boost pressure at that moment is taken as the second target boost pressure, denoted as... .

[0095] Specifically, through engine bench testing, it was found that after fixing the engine speed (fixing the engine piston scavenging frequency and basic pumping capacity to eliminate the interference of speed fluctuations on intake airflow and boost build-up, and studying the dynamic response of the boost system itself), using the first target boost pressure as the initial setpoint to drive the boost closed loop, and real-time acquisition of boost pressure and observation of the dynamic process (rise, overshoot, fall, convergence) as the boost pressure approaches the first target boost pressure from the initial value, the overshoot of the boost pressure is considered to be less than ±2% as whether the boost pressure has stably reached the first target boost pressure. The convergence criteria for the target boost pressure are as follows: (overshoot ±2% means that the relative error between the boost pressure and the first target boost pressure is within ±2%, the fluctuation converges and no longer oscillates significantly; if it is not within the ±2% range, it means that the pressure is still oscillating, rising and falling, and the system is still dynamically adjusting; if it enters the ±2% error band, it means that after the boost system has undergone lag adjustment, the gas flow and pipeline pressure have reached dynamic equilibrium, and the intake flow stably matches the demand corresponding to the first target boost pressure). The boost pressure measured at this moment of convergence and stabilization is calibrated as the second target boost pressure.

[0096] Understandably, the first target boost pressure is a steady-state ideal calibration value (theoretical demand pressure). However, in reality, when the system is truly stable and in equilibrium, the actual boost pressure is not equal to the first target boost pressure. Therefore, the boost pressure measured after bench testing convergence is used as the optimization control target. The second target boost pressure is the pressure at which the system can truly stabilize, enabling the matching of intake airflow and engine demand airflow. This resolves the control contradiction where the set pressure is reached but the intake airflow cannot keep up, improves boost control accuracy, and optimizes transient boost.

[0097] In summary, the first target boost pressure is the ideal pressure calculated theoretically and calibrated in steady state; the second target boost pressure is the actual pressure measured under fixed speed on the test bench, after the system adjusts to the first target boost pressure until the pressure fluctuation is less than ±2% and the air path is dynamically balanced. This is used to compensate for the response lag of the turbo intake system and serves as an optimized boost target that better matches the dynamic characteristics of the actual vehicle.

[0098] Furthermore, in some embodiments, the actual boost pressure is obtained by measuring the intake pressure at the throttle inlet. As the actual boost pressure , represented as: .

[0099] In some embodiments, obtaining the first boost pressure difference based on the first target boost pressure and the actual boost pressure includes: subtracting the actual boost pressure from the first target boost pressure to obtain the first boost pressure difference, denoted as . .

[0100] In some embodiments, obtaining the second boost pressure difference based on the second target boost pressure and the actual boost pressure includes: subtracting the actual boost pressure from the second target boost pressure to obtain the second boost pressure difference, denoted as . .

[0101] S2, monitor in real time whether the engine system meets all preset conditions at the same time, and when the time for the engine system to meet all preset conditions at the same time exceeds a preset time threshold, read the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and read the second boost pressure difference of the most recent consecutive sampling cycles to form a second array.

[0102] In some embodiments, all preset conditions include:

[0103] Condition 1: The fluctuation of the target intake pressure does not exceed the first preset fluctuation threshold.

[0104] Condition 2: The engine intake air volume has not reached the engine's maximum air volume;

[0105] Condition 3: The fluctuation of the throttle opening does not exceed the second preset fluctuation threshold.

[0106] Condition 4: Neither the first target boost pressure nor the second target boost pressure has decreased;

[0107] Condition 5: The rate of change of engine speed is not lower than the first preset rate of change value;

[0108] Condition 6: The rate of change of cylinder intake air density is not lower than the second preset rate of change value;

[0109] Condition 7: The engine is not shut off from fuel;

[0110] Condition 8: The engine did not experience knocking or pre-ignition;

[0111] Condition 9: Engine exhaust temperature does not exceed the preset exhaust temperature threshold;

[0112] Condition 10: No component failures have occurred in the intake system.

[0113] Specifically, in some embodiments, the method for obtaining the target intake pressure in condition one can be found in Chinese patent publication CN111219243A, which indicates that the target intake pressure can be obtained using a conventional algorithm of existing PID boost closed-loop control. Condition one requires that the fluctuation of the target intake pressure be small; for example, the first preset fluctuation threshold can be set to 2 kPa, that is, the fluctuation of the target intake pressure is within ±2 kPa.

[0114] Specifically, in some embodiments, the method for obtaining the maximum air volume of the engine in condition two can be found in Chinese patent publication number CN114048680A, which will not be repeated here.

[0115] Specifically, in some embodiments, condition three requires that the throttle opening fluctuate less. For example, the second preset fluctuation threshold can be set to 1%, that is, the fluctuation of the target boost pressure is within ±1%.

[0116] Specifically, in some embodiments, condition four requires that neither the first target boost pressure nor the second target boost pressure has decreased.

[0117] Specifically, in some embodiments, condition five requires that the rate of change of engine speed is not lower than a preset value. For example, the first preset rate of change value can be set to 10 rpm / ms, that is, the rate of change of engine speed is greater than or equal to 10 rpm / ms.

[0118] Specifically, in some embodiments, condition six requires that the rate of change of the fresh air intake density into the cylinder is not lower than a preset value. For example, the second preset rate of change value can be set to 5 mg / ms, that is, the rate of change of the cylinder intake density is greater than or equal to 5 mg / ms.

[0119] Specifically, in some embodiments, condition seven requires that the engine is not de-fueled.

[0120] Specifically, in some embodiments, condition eight requires that the engine does not experience knocking and that there is no pre-ignition.

[0121] Specifically, in some embodiments, condition nine requires that the engine exhaust temperature not exceed the limit; for example, the preset exhaust temperature threshold can be set to 950°C.

[0122] Specifically, in some embodiments, condition ten requires that no failure of intake system-related components has occurred.

[0123] Furthermore, in some embodiments, the preset time threshold is expressed as:

[0124]

[0125] in, The default time. For the preset time threshold, The learning coefficient is set to the preset time threshold.

[0126] Specifically, the preset time threshold learning coefficient The default value can be set to 0. The default value can be continuously updated through self-learning and saved after the vehicle is powered off.

[0127] Specifically, the default time can be set to 0.5 seconds.

[0128] Furthermore, in some embodiments, when the time for which the engine system simultaneously meets all preset conditions exceeds a preset time threshold, the first boost pressure difference of the most recent consecutive V1+2 sampling cycles is read to form a first array of length V1+2, and the second boost pressure difference of the most recent consecutive V1+2 sampling cycles is read to form a second array of length V1+2. The elements in the first array and the second array are calibrated with the same sampling time and sampling cycle, and the elements in the first array and the second array are arranged in reverse chronological order.

[0129] At this point, the first array is represented as:

[0130]

[0131] in, This is the first boost pressure difference during the current sampling period. This represents the first boost pressure difference from the previous sampling period. This refers to the first boost pressure difference during the (V1+1)th sampling period. Let be the pressure difference of the first boost during the first V1+2 sampling periods. Let any element in the first V1 sampling periods be denoted as . (i=0,1,2,…,V1-1).

[0132] The second array is now represented as:

[0133]

[0134] in, This is the second boost pressure difference under the current sampling period. This represents the second boost pressure difference from the previous sampling period. This represents the second boost pressure difference during the first V1+1 sampling period. Let be the second boost pressure difference during the first V1+2 sampling periods. Let any element from the first V1 sampling periods be denoted as . (i=0,1,2,…,V1-1).

[0135] For example, the preset time threshold can be set to 0.5s, the default value of V1 can be set to 9, and the default value of V1 can be continuously updated through self-learning and saved after the vehicle is powered off.

[0136] The first boost pressure difference was read after V1+2 consecutive samplings (11 times in this case). The first array is then formed. .

[0137] The second boost pressure difference was read after V1+2 consecutive samplings (11 times in this case). The second array is then formed. .

[0138] S3, calculate the estimated boost pressure difference corresponding to the first boost pressure difference of the first V1 sampling periods in the first array.

[0139] It is understandable that the first boost pressure difference of the first V1 sampling periods in the first array is taken, and any element in the first V1 sampling periods is denoted as... (i=0,1,2,……,V1-1), that is, excluding the first boost pressure difference in the first V1+1 sampling period and the first V1+2 sampling period. and The first boost pressure difference beyond that needs to be calculated to determine the corresponding first estimated boost pressure difference.

[0140] It should be noted that although the first boost pressure difference of V1+2 sampling cycles is read during the reading phase, the estimated boost pressure difference corresponding to the first boost pressure difference of V1 sampling cycles is calculated during the anomaly detection process.

[0141] In some embodiments, the estimated boost pressure difference corresponding to the first boost pressure difference in any of the first V1 sampling periods in the first array is expressed as:

[0142]

[0143] in, (i=0,1,2,……,V1-1) represents the first boost pressure difference in any of the first V1 sampling periods in the first array. For trend filtering time, The time interval between adjacent sampling periods. This is the estimated boost pressure difference corresponding to the first boost pressure difference.

[0144] Furthermore, in some embodiments, the trend filtering time is expressed as:

[0145]

[0146] in, This is the baseline value for the trend filter time. For trend filtering time, For the correction factor one, The correction factor is two. The pressure difference in the first boost pressure difference is the pressure difference in the next sampling period of any one of the first V1 sampling periods in the first array. To increase the pressure for the primary objective, This is the actual atmospheric pressure. Where n is the standard atmospheric pressure and n is the engine speed. These are the time learning coefficients for trend filtering.

[0147] Specifically, the base value for the trend filter time can be set to 50ms.

[0148] Specifically, based on the first boost pressure difference of the next sampling period of any one of the first V1 sampling periods in the first array. With the first target boost pressure The ratio of the two values ​​and the engine speed n are used to obtain the correction factor one.

[0149] Specifically, based on standard atmospheric pressure Compared with actual atmospheric pressure The ratio of the two values ​​and the engine speed n are used to obtain the correction factor two. The standard atmospheric pressure is 101 kPa.

[0150] Specifically, the trend filter time learning coefficient The default value can be set to 0. The default value can be continuously updated through self-learning and saved after the vehicle is powered off.

[0151] It should be noted that the calibration of correction factor one and correction factor two was completed on an engine test bench under standard atmospheric pressure to determine the values ​​of n at different engine speeds. Below, at the first boost pressure difference When maintained at ±2 kPa, and The difference should not exceed ±2 kPa. After calibration, corrections are made under different atmospheric pressures on the actual vehicle to obtain correction factor two, especially when... When the correction factor is 1, the correction factor 2 equals 1.

[0152] S4. Based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, and the first target boost pressure and the second target boost pressure, a boost pressure fault is determined.

[0153] Figure 3 This invention provides a flowchart illustrating the process of determining a boost pressure failure. In some embodiments, the process of determining a boost pressure failure includes:

[0154] The difference between any first boost pressure difference and the corresponding estimated boost pressure difference under the same sampling period is taken as the first difference;

[0155] The difference between any second boost pressure difference and the corresponding first boost pressure difference under the same sampling period is taken as the second difference;

[0156] The proportion of the sampling period corresponding to the first target boost pressure with the first difference being greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the first proportion.

[0157] The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the first difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the second proportion;

[0158] The proportion of the sampling period corresponding to the first target boost pressure when the second difference is greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the third proportion.

[0159] The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the second difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the fourth proportion;

[0160] If in the first V1 sampling periods, each first difference and each second difference are not less than 0, and the first proportion exceeds the preset proportion threshold and the third proportion is greater than or equal to the first proportion, then the first type of severe fault of excessive boost pressure is considered to have occurred.

[0161] If, in the first V1 sampling periods, there are values ​​less than 0 and values ​​not less than 0 in the first difference, but each second difference is not less than 0, and the first proportion exceeds the preset proportion threshold, then a moderate fault of excessive boost pressure is considered to have occurred.

[0162] If in the first V1 sampling periods, each first difference is not less than 0, but there are second differences that are less than 0 and not less than 0, and the first proportion exceeds the preset proportion threshold, then a minor fault of excessive boost pressure is considered to have occurred.

[0163] If in the first V1 sampling periods, each first difference and each second difference are less than 0, and the second proportion exceeds the preset proportion threshold and the fourth proportion is greater than or equal to the second proportion, then the second type of severe fault with excessive boost pressure is considered to have occurred.

[0164] Specifically, Case 1: The first difference between the first boost pressure difference and the corresponding estimated boost pressure difference in all sampling periods across V1 sampling periods. The second difference between the second boost pressure difference and the corresponding first boost pressure difference in all sampling periods of V1 sampling periods, and all of them are not less than 0. All are not less than 0, and the first difference The first target boost pressure is greater than or equal to the preset threshold. The sampling period has a first proportion exceeding a preset proportion threshold in the first V1 sampling periods, and a second difference The first target boost pressure is greater than or equal to the preset threshold. If the proportion of the sampling period in the first V1 sampling periods exceeds the proportion in the third period, the preset proportion threshold can be set to 0.5. If it can be set to 0.1, then the first type of severe fault with excessive boost pressure is considered to have occurred.

[0165] Specifically, Case 2: The first difference between the first boost pressure difference and the corresponding estimated boost pressure difference in all sampling periods across V1 sampling periods. There exists a second difference between the second boost pressure difference and the corresponding first boost pressure difference in all sampling periods of V1 sampling periods, which is less than 0 and not less than 0. All are not less than 0 (indicating that future changes are likely to be large), and the first difference The first target boost pressure is greater than or equal to the preset threshold. The proportion of the sampling period in the first V1 sampling periods exceeds the preset proportion threshold. The preset proportion threshold can be set to 0.5. If set to 0.1, a moderate fault of excessive boost pressure is considered to have occurred.

[0166] Specifically, Case 3: The first difference between the first boost pressure difference and the corresponding estimated boost pressure difference in all sampling periods across V1 sampling periods. The second difference between the second boost pressure difference and the corresponding first boost pressure difference in all sampling periods of V1 sampling periods, and all of them are not less than 0. The value contains both values ​​less than 0 and values ​​not less than 0 (indicating that the current situation is prone to being too large, but the future trend is not likely to be too large), and the first difference... The first target boost pressure is greater than or equal to the preset threshold. The proportion of the sampling period in the first V1 sampling periods exceeds the preset proportion threshold. The preset proportion threshold can be set to 0.5. If it can be set to 0.1, then a minor fault of excessive boost pressure has occurred.

[0167] Specifically, Case 4: The first difference between the first boost pressure difference and the corresponding estimated boost pressure difference in all sampling periods across V1 sampling periods. All values ​​are less than 0, and the second difference between the second boost pressure difference and the corresponding first boost pressure difference in all sampling periods of V1 sampling periods. All are less than 0, and the first difference Less than or equal to the opposite value of the first target boost pressure at the preset threshold The second proportion of the sampling period in the first V1 sampling periods exceeds the preset proportion threshold, the second difference Less than or equal to the opposite value of the first target boost pressure at the preset threshold If the proportion of the sampling period in the first V1 sampling periods exceeds the proportion in the second period, the preset proportion threshold can be set to 0.5. If it can be set to 0.1, then the second type of severe fault with excessive boost pressure is considered to have occurred.

[0168] S5, when a severe fault of excessive boost pressure of type I is determined to occur in the engine system during a driving cycle, reduces the ignition angle efficiency and updates the sampling period V1 in that driving cycle.

[0169] In some embodiments, when a severe fault of excessive boost pressure (Type I) is determined to occur in the engine system during a driving cycle, the ignition angle efficiency is adjusted, and the sampling period V1 is updated during that driving cycle, including:

[0170] If a severe fault of excessive boost pressure (Type I) is determined to have occurred in the driving cycle, the ignition angle efficiency and the first target boost pressure are reduced. At the same time, the target opening of the turbine actuator in item D is updated, and the sampling period V1 is subtracted from the first preset period threshold to obtain the updated sampling period V1.

[0171] Scenario 1: When a severe fault of excessive boost pressure occurs, the ignition timing efficiency is reduced. and the first target boost pressure Simultaneously update the target opening degree of the turbine actuator in item D. The sampling period V1 is subtracted from the first preset period threshold to obtain the updated sampling period V1.

[0172] The reduced ignition angle efficiency is expressed as:

[0173]

[0174] in, To reduce the efficiency of the ignition angle.

[0175] The reduced first target boost pressure is expressed as:

[0176]

[0177] in, The target boost pressure is reduced.

[0178] Among them, item D is the target opening degree of the turbine actuator. See Chinese patent publication number CN120798551A.

[0179] When a severe fault of excessive boost pressure occurs (Category I), the updated target opening of the turbine actuator in item D is expressed as:

[0180]

[0181] in, For the updated target opening of the turbine actuator in item D, The first correction factor is determined by updating the P term. All of them were able to be improved and maintained within ±2kPa.

[0182] The first preset period threshold can be set to 4. The updated sampling period is then expressed as: V1 = V1(z) - 4, where V1(z) is the sampling period after the last update.

[0183] In some embodiments, the anomaly detection method applied to an engine system further includes:

[0184] If a moderate fault of excessive boost pressure is determined to have occurred in the driving cycle, the target opening of the turbine actuator in item D is updated, and the sampling period V1 is subtracted from the second preset period threshold to obtain the updated sampling period V1.

[0185] Scenario 2: When a moderate fault of excessive boost pressure occurs, immediately update the target opening of the turbine actuator in item D. The sampling period V1 is subtracted from the second preset period threshold to obtain the updated sampling period V1.

[0186] Among them, item D is the target opening degree of the turbine actuator. As with the above, this will not be repeated here.

[0187] The second preset period threshold can be set to 3. The updated sampling period is then expressed as: V1 = V1(z) - 3, where V1(z) is the sampling period after the last update.

[0188] In some embodiments, the anomaly detection method applied to an engine system further includes:

[0189] If a minor fault of excessive boost pressure is detected in the driving cycle, the target opening of the P-term turbine actuator is updated, and the sampling period V1 is reduced by the third preset period threshold to obtain the updated sampling period V1.

[0190] Scenario 3: When a minor fault of excessive boost pressure occurs, immediately update the target opening of the turbine actuator in item P. The sampling period V1 is subtracted from the third preset period threshold to obtain the updated sampling period V1.

[0191] Among them, the target opening degree of the turbine actuator in item P. See Chinese patent publication number CN120798551A.

[0192] When a minor fault of excessive boost pressure occurs, the updated P-term turbine actuator target opening is expressed as:

[0193]

[0194] in, For the updated P-term turbine actuator target opening, The second correction factor is determined by updating the P term. All of them were able to be improved and maintained within ±2kPa.

[0195] The third preset period threshold can be set to 1. The updated sampling period can then be expressed as: V1 = V1(z) - 1, where V1(z) is the sampling period after the last update.

[0196] In some embodiments, the anomaly detection method applied to an engine system further includes:

[0197] If a severe fault of excessive boost pressure (Type II) is determined to have occurred in the driving cycle, the second target boost pressure is increased, and the first target boost pressure is increased based on the increased second target boost pressure. The sampling period V1 is then added to the fourth preset period threshold as the updated sampling period V1.

[0198] Scenario 4: When a severe fault of excessive boost pressure occurs, the second target boost pressure is increased. Furthermore, if a severe fault of excessively high boost pressure occurs again, the second target boost pressure will be increased again. Then, based on the increased second target boost pressure Increase the first target boost pressure The sampling period V1 is increased by the fourth preset period threshold to obtain the updated sampling period V1.

[0199] When a severe fault of excessive boost pressure occurs for the first time, the increased second target boost pressure is expressed as follows:

[0200]

[0201] When a severe fault of excessive boost pressure occurs again, the increased second target boost pressure is expressed as follows:

[0202]

[0203] in, The increased pressure is the second target boost pressure.

[0204] The increased first target boost pressure is expressed as:

[0205]

[0206] in, The first target boost pressure after the increase.

[0207] The fourth preset period threshold can be set to 1. The updated sampling period is then expressed as: V1 = V1(z) + 1, where V1(z) is the sampling period after the last update.

[0208] In some embodiments, the anomaly detection method applied to an engine system further includes:

[0209] If no one of the following faults occurs in the first V1 sampling periods: mild fault due to excessive boost pressure, moderate fault due to excessive boost pressure, severe fault due to excessive boost pressure, or mild fault due to excessive boost pressure: then no fault has occurred.

[0210] If no fault occurs in the driving cycle, the number of fault-free occurrences in multiple driving cycles is accumulated; and when the accumulated number of fault-free occurrences is greater than the first preset threshold, the sampling period V1 is added to the fifth preset threshold as the updated sampling period V1.

[0211] Case 5: When the time for the engine system to simultaneously meet all preset conditions exceeds the preset time threshold, but no fault is determined to have occurred, record the number of fault-free occurrences (CNT1) in multiple driving cycles. When the cumulative number of fault-free occurrences exceeds the first preset number threshold, add the fifth preset period threshold to the sampling period (V1) as the updated sampling period (V1).

[0212] The default value of CNT1 can be set to 0. The default value of CNT1 can be continuously updated through self-learning and saved after the vehicle is powered off. The first preset number threshold can be set to 5, and the fifth preset period threshold can be set to 3. If CNT1 is greater than the first preset number threshold of 5, the updated sampling period is expressed as: V1 = V1(z) + 3. After the update is completed, CNT1 is cleared to 0.

[0213] It should be noted that after updating the sampling period V1 in the current driving cycle, the updated value is retained in this driving cycle, while the learned value will adopt the updated value at the beginning of the next driving cycle.

[0214] In some embodiments, the anomaly detection method applied to an engine system further includes:

[0215] If the number of driving cycles in which a severe fault of excessive boost pressure of type I and type II occurs exceeds the second preset threshold, it is considered that an excessive pressure fault has occurred in the engine system.

[0216] If the number of driving cycles in which severe faults of excessive boost pressure of type I and type II does not exceed the second preset threshold number, it is considered that no fault has occurred in the engine system.

[0217] Specifically, in some embodiments, the second preset threshold number can be set to 3. If the number of driving cycles in which a severe fault occurs exceeds the second preset threshold number, a high-pressure fault is considered to have occurred; otherwise, no fault is considered to have occurred. Furthermore, a fault code is reported after a fault occurs.

[0218] The technical solution in this embodiment of the invention reads the boost pressure difference from multiple recent consecutive sampling periods, calculates the corresponding estimated boost pressure difference, and compares the current boost pressure difference with the estimated boost pressure difference. Based on the difference between the current and estimated pressure differences, boost control is improved. When the intake air volume is too high, the ignition angle efficiency is adjusted to improve the boost effect. Simultaneously, the parameters of the boost closed-loop control process are adjusted to improve boost control efficiency. Through the technical solution in this embodiment of the invention, excessive boost pressure faults can be identified, and the parameters in the boost control process can be determined according to the fault level, as well as the boost pressure adjustment, thereby improving the accuracy of boost pressure control.

[0219] Based on the same inventive concept, embodiments of the present invention also provide an anomaly detection system applied to an engine system. Figure 4 This is a schematic diagram of the structure of an anomaly detection system applied to an engine system provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the system specifically includes:

[0220] The acquisition module 100 is used to acquire the first target boost pressure, the second target boost pressure, and the actual boost pressure; to obtain the first boost pressure difference based on the first target boost pressure and the actual boost pressure; and to obtain the second boost pressure difference based on the second target boost pressure and the actual boost pressure. The second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value.

[0221] The monitoring module 200 is used to monitor in real time whether the engine system meets all preset conditions at the same time, and when the time for the engine system to meet all preset conditions at the same time exceeds a preset time threshold, it reads the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and reads the second boost pressure difference of the most recent consecutive sampling cycles to form a second array.

[0222] Calculation module 300 is used to calculate the estimated boost pressure difference corresponding to the first boost pressure difference of the first V1 sampling periods in the first array;

[0223] The determination module 400 is used to determine the boost pressure fault based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, and the first target boost pressure and the second target boost pressure.

[0224] The execution module 500 is used to adjust the ignition angle efficiency and update the sampling period V1 in the driving cycle when it is determined that the engine system has a severe fault of excessive boost pressure of type I in a driving cycle.

[0225] The technical solutions in the embodiments of the present invention have similar beneficial effects to those described above, and will not be repeated here.

[0226] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 5As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the anomaly detection methods applied to an engine system as described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0227] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (BUS).

[0228] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0229] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0230] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the anomaly detection methods applied to an engine system described above. The computer-readable storage medium can be volatile or non-volatile.

[0231] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described anomaly detection method applied to an engine system.

[0232] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0233] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0234] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0235] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0236] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0237] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0238] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0239] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0240] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0241] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. An anomaly detection method applied to an engine system, characterized in that, include: The first target boost pressure, the second target boost pressure, and the actual boost pressure are obtained. The first boost pressure difference is obtained based on the first target boost pressure and the actual boost pressure, and the second boost pressure difference is obtained based on the second target boost pressure and the actual boost pressure. The second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value. Real-time monitoring of whether the engine system simultaneously meets all preset conditions, and when the time for the engine system to simultaneously meet all preset conditions exceeds a preset time threshold, reading the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and reading the second boost pressure difference of the most recent consecutive sampling cycles to form a second array; Calculate the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods of the first array; Based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, and the first target boost pressure and the second target boost pressure, a boost pressure fault is determined. When a severe fault of excessive boost pressure (Type I) is detected in the engine system during a driving cycle, the ignition angle efficiency is adjusted, and the sampling period V1 is updated during that driving cycle.

2. The method according to claim 1, characterized in that, All the preset conditions include: Condition 1: The fluctuation of the target intake pressure does not exceed the first preset fluctuation threshold. Condition 2: The engine intake air volume has not reached the engine's maximum air volume; Condition 3: The fluctuation of the throttle opening does not exceed the second preset fluctuation threshold. Condition 4: Neither the first target boost pressure nor the second target boost pressure has decreased; Condition 5: The rate of change of engine speed is not lower than the first preset rate of change value; Condition 6: The rate of change of cylinder intake air density is not lower than the second preset rate of change value; Condition 7: The engine is not shut off from fuel; Condition 8: The engine did not experience knocking or pre-ignition; Condition 9: Engine exhaust temperature does not exceed the preset exhaust temperature threshold; Condition 10: No component failures have occurred in the intake system.

3. The method according to claim 1, characterized in that, The estimated boost pressure difference corresponding to the first boost pressure difference in any of the first V1 sampling periods in the first array is expressed as: in, (i=0,1,2,……,V1-1) represents the first boost pressure difference in any of the first V1 sampling periods in the first array. For trend filtering time, The time interval between adjacent sampling periods. This is the estimated boost pressure difference corresponding to the first boost pressure difference.

4. The method according to claim 1, characterized in that, The process of determining the boost pressure fault includes: The difference between any first boost pressure difference and the corresponding estimated boost pressure difference under the same sampling period is taken as the first difference; The difference between any second boost pressure difference and the corresponding first boost pressure difference under the same sampling period is taken as the second difference; The proportion of the sampling period corresponding to the first target boost pressure with the first difference being greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the first proportion. The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the first difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the second proportion; The proportion of the sampling period corresponding to the first target boost pressure when the second difference is greater than or equal to the preset threshold in the first V1 sampling periods is recorded as the third proportion. The proportion of the sampling period corresponding to the opposite value of the first target boost pressure under the second difference being less than or equal to the preset threshold in the first V1 sampling periods is recorded as the fourth proportion; If in the first V1 sampling periods, each first difference and each second difference are not less than 0, and the first proportion exceeds the preset proportion threshold and the third proportion is greater than or equal to the first proportion, then the first type of severe fault of excessive boost pressure is considered to have occurred. If, in the first V1 sampling periods, there are values ​​less than 0 and values ​​not less than 0 in the first difference, but each second difference is not less than 0, and the first proportion exceeds the preset proportion threshold, then a moderate fault of excessive boost pressure is considered to have occurred. If in the first V1 sampling periods, each first difference is not less than 0, but there are second differences that are less than 0 and not less than 0, and the first proportion exceeds the preset proportion threshold, then a minor fault of excessive boost pressure is considered to have occurred. If in the first V1 sampling periods, each first difference and each second difference are less than 0, and the second proportion exceeds the preset proportion threshold and the fourth proportion is greater than or equal to the second proportion, then the second type of severe fault with excessive boost pressure is considered to have occurred.

5. The method according to claim 4, characterized in that, The process of determining the boost pressure fault also includes: If no one of the following faults occurs in the first V1 sampling periods: mild fault due to excessive boost pressure, moderate fault due to excessive boost pressure, severe fault due to excessive boost pressure, or mild fault due to excessive boost pressure (or the second type of excessive boost pressure), then it is considered that no fault has occurred.

6. The method according to claim 1, characterized in that, When a severe Type I boost pressure fault is detected in the engine system during a driving cycle, the ignition timing efficiency is adjusted, and the sampling period V1 is updated for that driving cycle, including: If a severe fault of excessive boost pressure (Type I) is determined to have occurred in the driving cycle, the ignition angle efficiency and the first target boost pressure are reduced. At the same time, the target opening of the turbine actuator in item D is updated, and the sampling period V1 is subtracted from the first preset period threshold to obtain the updated sampling period V1.

7. The method according to claim 1, characterized in that, Also includes: If a severe fault of excessive boost pressure (Type II) is determined to have occurred in the driving cycle, the second target boost pressure is increased, and the first target boost pressure is increased based on the increased second target boost pressure. The sampling period V1 is then added to the fourth preset period threshold as the updated sampling period V1.

8. An anomaly detection system applied to an engine system, characterized in that, The system is configured to implement the method according to any one of claims 1-7, the system comprising: The acquisition module is used to acquire the first target boost pressure, the second target boost pressure, and the actual boost pressure; to obtain the first boost pressure difference based on the first target boost pressure and the actual boost pressure; and to obtain the second boost pressure difference based on the second target boost pressure and the actual boost pressure. The second target boost pressure refers to the actual measured value obtained in the bench test with the first target boost pressure as the ideal calibration value. The monitoring module is used to monitor in real time whether the engine system meets all preset conditions at the same time. When the time for the engine system to meet all preset conditions at the same time exceeds a preset time threshold, it reads the first boost pressure difference of the most recent consecutive sampling cycles to form a first array and reads the second boost pressure difference of the most recent consecutive sampling cycles to form a second array. The calculation module is used to calculate the estimated boost pressure difference corresponding to the first boost pressure difference of the first V1 sampling periods in the first array, respectively; The determination module is used to determine the boost pressure fault based on the first boost pressure difference in the first V1 sampling periods in the first array, the second boost pressure difference in the first V1 sampling periods in the second array, the estimated boost pressure difference corresponding to the first boost pressure difference in the first V1 sampling periods, the first target boost pressure, and the second target boost pressure. The execution module is used to adjust the ignition angle efficiency and update the sampling period V1 in the driving cycle when the engine system is determined to have a severe fault of excessive boost pressure of type I in a driving cycle.

9. An electronic device, characterized in that, The electronic device includes: At least one processor, and a memory communicatively connected to said at least one processor; The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the steps of the method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to perform the steps of the method according to any one of claims 1-7.

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