Method, device, equipment and medium for detecting abnormality of engine boost system

Abstract

The present invention discloses a method, device, equipment, and medium for detecting abnormalities in an engine supercharging system. The method comprises: when an abnormality detection condition for the engine supercharging system is met, determining a standard threshold value for the opening of a supercharging actuator based on a current reference value for the opening of the supercharging actuator, an average value for the actual engine intake pressure, an average value for the actual engine throttle inlet pressure, an average value for the target boost pressure, an average value for the air excess coefficient, an average value for the actual engine intake flow rate, and a reference value for the actual engine intake flow rate; determining the current operating conditions and the corresponding opening threshold value; and determining whether the engine supercharging system is abnormal based on the current average value for the opening of the supercharging actuator, the standard threshold value for the opening of the supercharging actuator, and the corresponding opening threshold value. The present invention can detect abnormalities in the engine supercharging system so that repairs can be performed as soon as possible when problems occur in the engine supercharging system, thereby reducing the impact on the engine's power and economy.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and in particular relates to a method, device, equipment and medium for detecting abnormality in an engine supercharging system. Background Art

[0002] An engine supercharging system is a device that improves engine performance by increasing the amount of air entering the engine's combustion chambers, thereby increasing engine power and efficiency. By forcing more air (and sometimes fuel) into the combustion chambers, the system allows more fuel to be burned, resulting in greater power. Supercharging systems can not only significantly increase an engine's horsepower and torque, but can also improve fuel economy in some cases.

[0003] To respond to engine intake boost and torque increases, supercharging systems are designed to more efficiently utilize exhaust energy to achieve boost pressure, which in turn impacts engine power and economy. Therefore, the ability to diagnose supercharging systems is urgently needed to quickly identify performance issues and, if they do occur, to quickly repair them, minimizing the impact on engine power and economy.

[0004] Based on this, a method for detecting abnormality of an engine supercharging system is proposed, which is mainly used to detect whether the supercharging system performs abnormally. Summary of the Invention

[0005] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides an engine boost system abnormality detection method, device, equipment and medium to solve the problem of abnormality detection of the engine boost system, so as to perform timely maintenance when the engine boost system is abnormal, thereby reducing the impact on the engine's power and economy.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a method for detecting abnormality in an engine supercharging system is provided, the method comprising:

[0007] When the abnormality detection conditions of the engine supercharging system are met, the average value of the supercharging actuator opening, the reference value of the supercharging actuator opening, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target supercharging pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate, and the reference value of the actual engine intake flow rate are obtained;

[0008] Determining a boost actuator opening standard threshold based on a current boost actuator opening reference value, an average value of the actual engine intake pressure, an average value of the actual engine throttle inlet pressure, an average value of the target boost pressure, an average value of the air excess coefficient, an average value of the actual engine intake flow rate, and an actual engine intake flow reference value;

[0009] Determine the current working condition, and determine the corresponding opening threshold based on the current working condition;

[0010] Based on the current average value of the boost actuator opening, the boost actuator opening standard threshold, and the corresponding opening threshold, it is determined whether the engine boost system is abnormal.

[0011] In the above scheme, the boost actuator opening standard threshold is determined based on the current boost actuator opening reference value, the average actual engine intake pressure, the average actual engine throttle inlet pressure, the average target boost pressure, the average air excess coefficient, the average actual engine intake flow rate, and the actual engine intake flow reference value, including:

[0012]

[0013] Where, pct BoostActuatorLim is the standard threshold value of the boost actuator opening, pct BoostActuatorBase is the reference value of the boost actuator opening, p AftThrAct is the actual average value of the engine intake pressure, p BfThrAct is the actual average pressure at the engine throttle inlet, p BoostDesird is the average value of target boost pressure, λ is the average value of air excess coefficient, dm Cylinder is the average value of the actual intake flow rate of the engine, dm CylinderBase is the actual intake air flow reference value of the engine; Based on and The coefficient of determination, Based on λ and Determined coefficient.

[0014] In the above scheme, the method for obtaining the boost actuator opening reference value is:

[0015] On the engine stand, and When both are 1 and λ is 1, the boost actuator opening is obtained, which is the boost actuator opening reference value.

[0016] In the above solution, determining whether the engine supercharging system is abnormal based on the current average value of the supercharging actuator opening, the supercharging actuator opening standard threshold, and the corresponding opening threshold includes:

[0017]

[0018] Where, pct BoostActuator is the average opening degree of the boost actuator, pct BoostActuatorLim is the standard opening threshold of the boost actuator, and Δ1 is the opening threshold corresponding to the current working condition;

[0019] If the above formula is satisfied, it indicates that the engine supercharging system has not confirmed a fault once, otherwise it indicates that the engine supercharging system has not failed; if the number of times the engine supercharging system has not confirmed a fault exceeds a preset number, it indicates that the engine supercharging system has failed.

[0020] In the above scheme, the coefficient determination method is:

[0021] In different λ and Lower calibration and When a fault occurs in the engine supercharging system, the formula for determining whether the engine supercharging system is abnormal is satisfied, while when no fault occurs in the engine supercharging system, the formula for determining whether the engine supercharging system is abnormal is not satisfied.

[0022] In the above solution, determining the current working condition and determining the corresponding opening threshold based on the current working condition include:

[0023] Δ1=C×(1+r Adapt )

[0024] In the formula, Δ1 is the opening threshold, C is a constant, r Adapt It is the self-learning correction value;

[0025] Each operating condition type corresponds to an opening threshold; when detecting an abnormality in the engine supercharging system, whether the engine supercharging system is abnormal is determined based on the opening threshold corresponding to the current operating condition.

[0026] In the above scheme, the operating condition type is determined based on the average engine speed, the average actual engine intake flow rate, the average engine water temperature, the average engine ignition angle efficiency, and the average target boost pressure;

[0027] If the average engine speed, average actual engine intake flow, average engine water temperature, average engine ignition angle efficiency and average target boost pressure all meet the preset value range of a certain operating condition, then the current operating condition is considered to belong to the corresponding operating condition type.

[0028] In the above scheme, the self-learning correction value update method is:

[0029] After the engine supercharging system abnormality detection is completed, the number of times the engine supercharging system is abnormal CNT1 and the number of times the engine supercharging system is not faulty CNT2 are recorded;

[0030] If the number CNT1 is greater than the first preset value, the vehicle mileage L used for engine boost system abnormality detection exceeds the preset mileage value, and the number CNT2 is 0, the self-learning correction value r Adapt Updated to:

[0031] r Adapt =r Adapt (z)-0.02

[0032] Where r Adapt (z) is the self-learning correction value of the last updated learning; after the update is completed, the number of times CNT1, CNT2 and mileage L are all cleared to 0;

[0033] If the number CNT1 is greater than the second preset value, the vehicle mileage L used for engine boost system abnormality detection exceeds the preset mileage value, and the number CNT2 is greater than the third preset value, the self-learning correction value r Adapt Updated to:

[0034] r Adapt =r Adapt (z)+0.01

[0035] Where r Adapt (z) is the self-learning correction value of the last updated learning; after the update is completed, the number of times CNT1, CNT2 and mileage L are all cleared to 0;

[0036] In other cases, r Adapt =r Adapt (z).

[0037] In the above solution, the initial value of the self-learning correction value is 0, and the second preset value is smaller than the first preset value.

[0038] In the above scheme, the engine boost system abnormality detection conditions include:

[0039] The boost control is in closed-loop control state;

[0040] The engine speed fluctuation is within the preset range;

[0041] The actual engine intake pressure fluctuation is within the preset range;

[0042] The target engine intake pressure fluctuation is within the preset range;

[0043] The difference between the target opening and the actual opening of the boost actuator is within the preset range;

[0044] The throttle opening fluctuation is within the preset range;

[0045] The actual opening fluctuation of the boost actuator is within the preset range;

[0046] The target boost pressure fluctuation is within a preset range;

[0047] The difference between the target boost pressure and the actual boost pressure is within a preset range;

[0048] The engine water temperature is within the preset range;

[0049] The difference between the target air-fuel ratio and the actual air-fuel ratio is within the preset range;

[0050] The target air-fuel ratio fluctuates within a preset range;

[0051] The final ignition angle efficiency fluctuation of the engine is within the preset range;

[0052] The engine's basic ignition angle efficiency fluctuation is within the preset range;

[0053] The engine did not experience fuel shortage;

[0054] EGR rate is 0;

[0055] There is no fault in the boost system related sensors;

[0056] No faults occurred in the actuators related to the boost system;

[0057] No GPF-related faults occurred;

[0058] No catalyst-related faults occurred;

[0059] The engine boost system abnormality detection was not performed during this vehicle driving cycle;

[0060] If all of the above conditions are met for longer than the preset time, it is considered that the engine boost system abnormality detection conditions are met and the engine boost system abnormality detection is performed.

[0061] According to a second aspect of the present invention, there is provided an engine supercharging system abnormality detection device, comprising:

[0062] a data acquisition unit, configured to acquire, when an abnormality detection condition for the engine supercharging system is met, an average value of the supercharging actuator opening, a reference value of the supercharging actuator opening, an average value of the actual engine intake pressure, an average value of the actual engine throttle inlet pressure, an average value of the target supercharging pressure, an average value of the air excess coefficient, an average value of the actual engine intake flow rate, and a reference value of the actual engine intake flow rate at the current moment;

[0063] a standard threshold value unit, configured to determine a standard threshold value for the opening of the boost actuator based on a current reference value for the opening of the boost actuator, an average value of the actual intake pressure of the engine, an average value of the actual pressure at the throttle inlet of the engine, an average value of the target boost pressure, an average value of the air excess coefficient, an average value of the actual intake flow rate of the engine, and a reference value for the actual intake flow rate of the engine;

[0064] An opening threshold unit, used to determine the current working condition and determine the corresponding opening threshold based on the current working condition;

[0065] The abnormality judgment unit is used to determine whether the engine supercharging system is abnormal based on the average opening value of the supercharging actuator at the current moment, the standard opening threshold of the supercharging actuator and the corresponding opening threshold.

[0066] According to a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned methods for detecting abnormalities in an engine boost system are implemented.

[0067] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above-mentioned methods for detecting abnormality in an engine boost system are implemented.

[0068] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0069] The present invention determines a standard threshold value for the boost actuator opening based on the current boost actuator opening reference value, the average actual engine intake pressure, the average actual engine throttle inlet pressure, the target boost pressure, the average air excess coefficient, the average actual engine intake flow rate, and the actual engine intake flow rate reference value. The present invention also determines the current operating conditions, determines the corresponding opening threshold value based on the current operating conditions, and finally determines whether the engine boost system is abnormal based on the current average boost actuator opening value, the standard boost actuator opening threshold value, and the corresponding opening threshold value. The present invention can identify the impact of factors such as intake pressure on the boost actuator opening without affecting normal engine control, and update the standard boost actuator opening threshold value. Furthermore, as the engine life cycle progresses and the boost system ages, the present invention can update the opening threshold value for determining boost system failure in real time, identifying whether the boost system capacity is abnormal, so that repairs can be performed as soon as possible when problems occur, thereby reducing the impact on engine power and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 A flow chart of a method for detecting abnormality in an engine boost system provided by an embodiment of the present invention;

[0071] Figure 2 A flow chart of another method for detecting abnormality in an engine supercharging system provided by an embodiment of the present invention;

[0072] Figure 3 A schematic diagram of an engine boost system abnormality detection device provided by an embodiment of the present invention;

[0073] Figure 4A schematic structural diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0077] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0078] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] like Figure 1 and Figure 2 As shown, the engine boost system abnormality detection method of this embodiment includes the following steps:

[0080] S1. When the engine boost system abnormality detection conditions are met, obtain the current average value of the boost actuator opening, the boost actuator opening reference value, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target boost pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate, and the actual engine intake flow rate reference value.

[0081] First, the abnormal performance detection of the boost system must meet certain conditions:

[0082] (1) The boost control is in a closed-loop control state. The closed-loop control conditions of the boost control can be found in patent CN201910988050.8 "Exhaust Gas Turbine Engine Boost Closed-Loop Adaptive System and Control Method".

[0083] (2) The engine speed fluctuation is within a preset range. In this example, the preset range is ±15 rpm.

[0084] (3) The actual engine intake pressure (the actual value of the intake pressure at the throttle outlet, i.e., the actual value of the gas pressure entering the cylinder) fluctuates within a preset range. In this example, it is set to ±2 kPa.

[0085] (4) The target engine intake pressure (the target value of the intake pressure at the throttle valve outlet, i.e., the target value of the gas pressure entering the cylinder) fluctuates within a preset range. In this example, it is set to ±2 kPa.

[0086] (5) The difference between the target opening of the boost actuator and the actual opening (the larger the opening, the stronger the boost capability, the opening changes from 0% to 100%) is within a preset range, which is ±1% in this example.

[0087] (6) The throttle opening fluctuation is within a preset range, which is ±1% in this example.

[0088] (7) The actual opening of the boost actuator fluctuates within a preset range, which in this example is ±1%.

[0089] (8) The target boost pressure (for details, see patent CN202010109549.X “Method and Storage Medium for Determining Target Boost Pressure of Exhaust Gas Turbocharged Engine”) fluctuates within a preset range, which in this example is ±2 kPa.

[0090] (9) The difference between the target boost pressure and the actual boost pressure is within a preset range, which in this example is ±2 kPa.

[0091] (10) The engine water temperature is within a preset range, which in this example is 60°C to 100°C, and the engine water temperature fluctuation is within a preset range, which in this example is ±3°C.

[0092] (11) The difference between the target air-fuel ratio and the actual air-fuel ratio is within a preset range, which in this example is ±0.05.

[0093] (12) The target air-fuel ratio fluctuation is within a preset range, which in this example is ±0.02.

[0094] (13) The final ignition angle efficiency of the engine fluctuates within a preset range, which in this example is ±0.05.

[0095] (14) The basic ignition angle efficiency of the engine (the definition of basic ignition angle efficiency can be found in patent CN202110717601.4 "Calculation method, computer equipment and storage medium for basic ignition efficiency of engine") fluctuates within a preset range, and in this example, it is set to ±0.05.

[0096] (15) The engine did not experience fuel shortage.

[0097] (16) The EGR rate is 0.

[0098] (17) No fault occurred in the sensors related to the boost system.

[0099] (18) No fault occurred in the actuators related to the boost system.

[0100] (19) No GPF (Gasoline Particulate Filter) related faults occurred.

[0101] (20) No catalyst-related failures occurred.

[0102] (21) No boost rationality fault diagnosis was performed during this vehicle driving cycle.

[0103] The supercharged engine boost rationality diagnosis can only be performed after all of the above conditions have been met for a period exceeding the preset time t0 (2 seconds in this example). If all of the above conditions are not met during the supercharged engine boost rationality diagnosis, the diagnosis is terminated. Recording and collecting supercharged system performance fault data can only be resumed in the current driving cycle after all of the above conditions are met again.

[0104] After entering the supercharged engine boost rationality diagnosis, the engine speed, actual engine intake flow, engine water temperature, engine ignition angle efficiency, and target boost pressure are obtained. The average engine speed, average actual engine intake flow, average engine water temperature, average engine ignition angle efficiency, and average target boost pressure are calculated. Each average value is the average of the corresponding values ​​over several consecutive sampling periods.

[0105] The system pre-classifies various operating conditions based on average engine speed, average actual engine intake air flow, average engine water temperature, average engine ignition angle efficiency, and average target boost pressure. If the current average engine speed, average actual engine intake air flow, average engine water temperature, average engine ignition angle efficiency, and average target boost pressure all fall within the preset numerical ranges for a particular operating condition, the current operating condition is considered to fall within that specific range. Subsequent engine boost system anomaly determinations and self-learning correction value updates are performed under the same operating condition.

[0106] At the same time, the current average value of the boost actuator opening, the boost actuator opening reference value, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target boost pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate and the actual engine intake flow rate reference value will also be obtained.

[0107] S2. Determine the boost actuator opening standard threshold based on the current boost actuator opening reference value, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target boost pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate, and the actual engine intake flow rate reference value.

[0108] Booster actuator opening standard threshold pct BoostActuatorLim and boost actuator opening reference value pct BoostActuatorBase , the actual average pressure at the engine throttle inlet p BfThrAct , the average value of the actual engine intake pressure p AftThrAct , average value of air excess coefficient λ, average value of actual engine intake flow dm Cylinder , target boost pressure average value p BoostDesird , the actual engine intake flow reference value dm CylinderBase The calculation formula is as follows:

[0109]

[0110] At the same throttle inlet pressure, if the ratio of the actual engine intake pressure to the engine throttle inlet pressure is smaller, it means that the throttle pressure drop is larger. At this time, the throttle outlet pressure and the intake flow into the cylinder are smaller, and the exhaust energy is smaller. To achieve the same boost pressure, a larger boost actuator opening is required; pressure ratio The smaller it is, the more it affects the exhaust capacity. The larger the opening of the boost actuator is, the same boost pressure can be achieved. The larger the average value of the air excess coefficient λ is, the more air accounts for the mixture, and the higher the exhaust temperature is. Under the same engine intake density, the smaller the exhaust energy is, and the larger the opening of the boost actuator is, the same boost pressure can be achieved.

[0111] Actual engine intake flow reference value dm CylinderBase , is the reference value of the intake flow rate, which is 15g / s in this example. and The method of obtaining is on the engine test bench, first When λ=1, the actual boost actuator opening is obtained, that is, the boost actuator opening reference value pct BoostActuatorBase , and then in different The influence of the opening of the boost actuator under λ is calibrated. The specific process is as follows:

[0112] The basis for fault judgment is:

[0113] Install the fault boost system on the test bench and adjust the different The λ parameter ensures that the performance difference of the faulty supercharging system can be compared, ensuring that the faulty supercharging system can perform

[0114]

[0115] After multiple samplings, the faulty parts are selected. and After determining the above parameters, multiple tests were conducted, and the normal boost system was installed on the test bench to adjust the different λ parameter verification ensures that the normal boost system cannot show

[0116]

[0117] If the normal boost system shows

[0118] Then recalibrate the parameters to ensure that the faulty parts appear and the normal parts do not appear.

[0119] Based on this, the calibration data of this example are shown in Table 1 and Table 2.

[0120] Table 1 Calibration table

[0121]

[0122] Table 2 Calibration table

[0123]

[0124] S3. Determine the current working condition, and determine the corresponding opening threshold based on the current working condition.

[0125] Each operating condition type corresponds to an opening threshold; when detecting an abnormality in the engine supercharging system, whether the engine supercharging system is abnormal is determined based on the opening threshold corresponding to the current operating condition.

[0126] S4. Determine whether the engine supercharging system is abnormal based on the current average opening value of the supercharging actuator, the standard opening threshold value of the supercharging actuator, and the corresponding opening threshold value.

[0127] The average value of the boost actuator opening pct of the current working conditions (average engine speed, average actual engine intake flow, average engine water temperature, average engine ignition angle efficiency, average target boost pressure) BoostActuator With the standard threshold pct BoostActuatorLim Make a comparison to determine whether there is a rationality fault in the boost.

[0128] Specifically, compare the average value of the boost actuator opening pct BoostActuator With the standard threshold pct BoostActuatorLim The difference between the two values ​​can be used to determine whether a boost rationality fault has occurred, as shown below:

[0129]

[0130] If the above equation is satisfied, a boost rationality failure has occurred once; otherwise, no boost rationality failure has occurred. If the number of unconfirmed boost rationality failures exceeds a preset number (50 in this example), a boost rationality failure has occurred. After a boost capability failure occurs, boost rationality diagnosis will no longer be performed until the fault is cleared by the aftermarket 4S dealership.

[0131] Among them, Δ1 is the opening threshold, Δ1=C×(1+r Adapt ), C is a constant, which is 0.2 in this example. Adapt is a self-learning correction value, initially set to 0, and saved when the vehicle is powered off. During each drive cycle, a boost rationality fault is detected at most once. If the test is complete, it will not be tested again for that drive cycle until the next drive cycle meets the diagnostic criteria. After each test, the number of diagnostic satisfaction times (CNT1) and the number of times the fault was diagnosed as not occurring (CNT2) are recorded and stored, and saved after the vehicle is powered off.

[0132] if:

[0133] 1) The number of occurrences CNT1 is greater than the preset value (10,000 times in this example), the vehicle mileage L used for boost rationality diagnosis exceeds the preset value (10,000 kilometers in this example), and CNT2 is 0, then the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)-0.02, where r Adapt (z) is the self-learning correction value of the last update. After the update is completed, CNT1, CNT2 and L are all cleared to 0, and then the update is accumulated again.

[0134] 2) The number of occurrences CNT1 is greater than the preset value (100 times in this example), the vehicle mileage L used for boost rationality diagnosis exceeds the preset value (8,000 kilometers in this example), and CNT2 is 10, then the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z) + 0.01, where r Adapt (z) is the self-learning correction value of the last update. After the update is completed, CNT1, CNT2 and L are all cleared to 0, and then the update is accumulated again.

[0135] 3) In other cases, r Adapt =r Adapt (z).

[0136] It should be noted that the self-learning correction value r Adapt The value increased each time (in this example, 0.01 each time) is greater than the self-learning correction value r Adapt The reason for the small decrease in each update (0.02 in this example) is that the threshold updates do not make fault diagnosis more difficult. This is primarily due to the increased probability of supercharger failures over the lifecycle of the supercharger, which prevents premature failure diagnosis and the resulting loss of engine power and economy. Furthermore, the self-learning correction value updates only target the thresholds for the current operating condition; other operating conditions are not learned.

[0137] The above completes the entire description of the boost system abnormality detection method.

[0138] Based on the engine boost system abnormality detection method of the above embodiment, the embodiment of the present application also provides an engine boost system abnormality detection device, such as Figure 3 As shown, including:

[0139] a data acquisition unit 501 configured to acquire, when an engine supercharging system abnormality detection condition is met, an average value of the supercharging actuator opening, a reference value of the supercharging actuator opening, an average value of the actual engine intake pressure, an average value of the actual engine throttle inlet pressure, an average value of the target supercharging pressure, an average value of the air excess coefficient, an average value of the actual engine intake flow rate, and a reference value of the actual engine intake flow rate at the current moment;

[0140] a standard threshold unit 502 for determining a standard threshold for the opening of a boost actuator based on a current reference value for the opening of the boost actuator, an average value of the actual engine intake pressure, an average value of the actual engine throttle inlet pressure, an average value of the target boost pressure, an average value of the air excess coefficient, an average value of the actual engine intake flow rate, and a reference value for the actual engine intake flow rate;

[0141] The opening threshold unit 503 is used to determine the current working condition and determine the corresponding opening threshold based on the current working condition;

[0142] The abnormality determination unit 504 is configured to determine whether the engine supercharging system is abnormal based on the current average opening degree of the supercharging actuator, the standard opening degree threshold of the supercharging actuator, and the corresponding opening degree threshold.

[0143] like Figure 4 The figure shows a schematic diagram of the structure of a computer device provided by an embodiment of the present invention, such as a smart phone, tablet computer, laptop computer, desktop computer, rack server, blade server, tower server or cabinet server (including a standalone server or a server cluster composed of multiple servers), etc. The computer device 20 of this embodiment includes at least but not limited to: a memory 21 and a processor 22 that can be interconnected via a system bus, such as Figure 4 It should be pointed out that Figure 4 Computer device 20 is shown only with components 21 - 22 , but it should be understood that implementing all of the illustrated components is not a requirement, and greater or fewer components may alternatively be implemented.

[0144] In this embodiment, the memory 21 (i.e., a readable storage medium) includes flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and programmable read-only memory (PROM). The memory 21 can also be an external storage device of the computer device 20, such as a plug-in hard disk equipped on the computer device 20, a smart memory card (SMC), a secure digital (SD) card, a flash card, etc. Of course, the memory 21 can also include both the internal storage unit of the computer device 20 and its external storage device. In this embodiment, the memory 21 is generally used to store the operating system and various application software installed on the computer device 20, such as the program code of the engine supercharging system abnormality detection method in the method embodiment. In addition, the memory 21 can also be used to temporarily store various types of data that have been output or are about to be output.

[0145] In some embodiments, the processor 22 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor 22 is generally used to control the overall operation of the computer device 20. In this embodiment, the processor 22 is used to execute program code stored in the memory 21 or process data. For example, the processor 22 executes a device storing program code for an engine boost system abnormality detection method to implement the engine boost system abnormality detection method in the method embodiment.

[0146] The present application also provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., an SD or DX memory), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, a server, an App application store, etc., on which a computer program is stored, and when the program is executed by a processor, a corresponding function is implemented. The computer-readable storage medium of this embodiment is used to store the program code of the engine supercharging system abnormality detection method, and when executed by the processor, the engine supercharging system abnormality detection method of the method embodiment is implemented.

[0147] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0148] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0149] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0151] In summary, the present invention proposes a method, device, equipment and medium for detecting abnormalities in an engine boost system, which can identify the influence of intake pressure, etc. on the opening of the boost actuator without affecting the normal control of the engine, and update the boost actuator opening threshold. At the same time, as the engine life cycle progresses and as the boost system ages, the judgment differences in judging boost system failures are updated in real time, and whether the boost system capacity is abnormal can be identified. When problems occur, maintenance can be carried out as soon as possible, thereby reducing the impact on the engine's power and economy.

[0152] It should be noted that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0153] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0154] It will be easily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting abnormality in an engine supercharging system, characterized in that: The method includes: When the abnormality detection conditions of the engine supercharging system are met, the average value of the supercharging actuator opening, the reference value of the supercharging actuator opening, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target supercharging pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate, and the reference value of the actual engine intake flow rate are obtained; Based on the current boost actuator opening reference value, the average actual engine intake pressure, the average actual engine throttle inlet pressure, the average target boost pressure, the average air excess coefficient, the average actual engine intake flow rate, and the actual engine intake flow reference value, the boost actuator opening standard threshold is determined, including: Where, is the standard threshold value of the boost actuator opening, is the boost actuator opening reference value, is the average actual intake pressure of the engine, is the actual average pressure at the engine throttle inlet, is the target boost pressure average value, is the average value of the excess air coefficient, is the average value of the actual intake flow rate of the engine, is the actual intake air flow reference value of the engine; Based on and The coefficient of determination, Based on and coefficient of determination; Determine the current working condition, and determine the corresponding opening threshold based on the current working condition; Based on the current average value of the boost actuator opening, the boost actuator opening standard threshold, and the corresponding opening threshold, it is determined whether the engine boost system is abnormal.

2. The engine boost system abnormality detection method according to claim 1, characterized in that: The method for obtaining the boost actuator opening reference value is: On the engine stand, 、 and Both are 1 and When it is 1, the boost actuator opening is obtained, which is the boost actuator opening reference value.

3. The engine boost system abnormality detection method according to claim 1, characterized in that: Based on the current average value of the boost actuator opening, the boost actuator opening standard threshold and the corresponding opening threshold, determine whether the engine boost system is abnormal. include: Where, is the average opening degree of the boost actuator, is the standard threshold value of the boost actuator opening, is the opening threshold corresponding to the current working condition; If the above formula is satisfied, it indicates that the engine supercharging system has not confirmed a fault once, otherwise it indicates that the engine supercharging system has not failed; if the number of times the engine supercharging system has not confirmed a fault exceeds a preset number, it indicates that the engine supercharging system has failed.

4. The engine boost system abnormality detection method according to claim 3, characterized in that: The coefficient determination method is: In different 、 、 and Lower calibration and , so that when the engine supercharging system fails, the formula for determining whether the engine supercharging system is abnormal is satisfied, while when the engine supercharging system does not fail, the formula for determining whether the engine supercharging system is abnormal is not satisfied.

5. The engine boost system abnormality detection method according to claim 1, characterized in that: Determine the current working condition and determine the corresponding opening threshold based on the current working condition, including: Where, is the opening threshold, C is a constant, It is the self-learning correction value; Each operating condition type corresponds to an opening threshold; when detecting an abnormality in the engine supercharging system, whether the engine supercharging system is abnormal is determined based on the opening threshold corresponding to the current operating condition.

6. The engine boost system abnormality detection method according to claim 5, characterized in that: Determine the operating condition type based on the average engine speed, the average actual engine intake air flow, the average engine water temperature, the average engine ignition angle efficiency, and the average target boost pressure; If the average engine speed, average actual engine intake flow, average engine water temperature, average engine ignition angle efficiency and average target boost pressure all meet the preset value range of a certain operating condition, then the current operating condition is considered to belong to the corresponding operating condition type.

7. The engine boost system abnormality detection method according to claim 5, characterized in that: The self-learning correction value update method is: After the engine supercharging system abnormality detection is completed, the number of times the engine supercharging system abnormality detection conditions are met CNT1 and the number of times the engine supercharging system does not fail CNT2 are recorded; If the number CNT1 is greater than the first preset value, the vehicle mileage L used for engine boost system abnormality detection exceeds the preset mileage value, and the number CNT2 is 0, the self-learning correction value Updated to: Where, It is the self-learning correction value of the last updated learning; After the update is completed, the number of times CNT1, CNT2 and mileage L are all cleared to 0; If the number CNT1 is greater than the second preset value, the vehicle mileage L used for engine boost system abnormality detection exceeds the preset mileage value, and the number CNT2 is greater than the third preset value, the self-learning correction value Updated to: Where, It is the self-learning correction value of the last updated learning; After the update is completed, the number of times CNT1, CNT2 and mileage L are all cleared to 0; In other cases, .

8. The method for detecting abnormality in an engine supercharging system according to claim 7, wherein: The initial value of the self-learning correction value is 0, and the second preset value is smaller than the first preset value.

9. The engine boost system abnormality detection method according to claim 1, characterized in that: Engine boost system abnormality detection conditions include: The boost control is in closed-loop control state; The engine speed fluctuation is within the preset range; The actual engine intake pressure fluctuation is within the preset range; The target engine intake pressure fluctuation is within the preset range; The difference between the target opening and the actual opening of the boost actuator is within the preset range; The throttle opening fluctuation is within the preset range; The actual opening fluctuation of the boost actuator is within the preset range; The target boost pressure fluctuation is within a preset range; The difference between the target boost pressure and the actual boost pressure is within a preset range; The engine water temperature is within the preset range; The difference between the target air-fuel ratio and the actual air-fuel ratio is within the preset range; The target air-fuel ratio fluctuates within a preset range; The final ignition angle efficiency fluctuation of the engine is within the preset range; The engine's basic ignition angle efficiency fluctuation is within the preset range; The engine did not experience fuel shortage; EGR rate is 0; There is no fault in the boost system related sensors; No faults occurred in the actuators related to the boost system; No GPF-related faults occurred; No catalyst-related faults occurred; The engine boost system abnormality detection was not performed during this vehicle driving cycle; If all of the above conditions are met for longer than the preset time, it is considered that the engine boost system abnormality detection conditions are met and the engine boost system abnormality detection is performed.

10. An engine boost system abnormality detection device, characterized in that: include: a data acquisition unit, configured to acquire, when an abnormality detection condition for the engine supercharging system is met, an average value of the supercharging actuator opening, a reference value of the supercharging actuator opening, an average value of the actual engine intake pressure, an average value of the actual engine throttle inlet pressure, an average value of the target supercharging pressure, an average value of the air excess coefficient, an average value of the actual engine intake flow rate, and a reference value of the actual engine intake flow rate at the current moment; The standard threshold unit is used to determine the standard threshold of the boost actuator opening based on the current boost actuator opening reference value, the average value of the actual engine intake pressure, the average value of the actual engine throttle inlet pressure, the average value of the target boost pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate, and the actual engine intake flow rate reference value, including: Where, is the standard threshold value of the boost actuator opening, is the boost actuator opening reference value, is the average actual intake pressure of the engine, is the actual average pressure at the engine throttle inlet, is the target boost pressure average value, is the average value of the excess air coefficient, is the average value of the actual intake flow rate of the engine, is the actual intake air flow reference value of the engine; Based on and The coefficient of determination, Based on and coefficient of determination; An opening threshold unit, used to determine the current working condition and determine the corresponding opening threshold based on the current working condition; The abnormality judgment unit is used to determine whether the engine supercharging system is abnormal based on the average opening value of the supercharging actuator at the current moment, the standard opening threshold of the supercharging actuator and the corresponding opening threshold.

11. A computer device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for detecting abnormality of an engine supercharging system according to any one of claims 1 to 9 are implemented.

12. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the engine boost system abnormality detection method according to any one of claims 1 to 9 are implemented.

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