Engine supercharging system anomaly detection method, device, equipment and medium

Abstract

The invention discloses an engine supercharging system anomaly detection method, an engine supercharging system anomaly detection device, engine supercharging system anomaly detection equipment and a medium. The method comprises the following steps of: acquiring a target supercharging pressure average value based on a supercharging actuator opening degree reference value, an engine actual intake pressure average value, an engine throttle inlet actual pressure average value, a target supercharging pressure average value, an air excess coefficient average value, an engine actual intake flow average value and an engine actual intake flow reference value at the current moment; determining a standard threshold value of the opening degree of the supercharging actuator; the working condition at the current moment is determined, and a corresponding opening threshold value is determined; and whether the engine supercharging system is abnormal or not is determined based on the average value of the opening degree of the supercharging actuator at the current moment, the standard opening degree threshold value of the supercharging actuator and the corresponding opening degree threshold value. The engine supercharging system abnormity detection method can detect the abnormity of the engine supercharging system so as to maintain the engine supercharging system as soon as possible when the engine supercharging system goes wrong, thereby reducing the influence on the dynamic property and economical efficiency of the engine.

Description

Technical Field

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

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

[0003] In order to respond to the engine intake boost and engine torque increase request, the boost system is designed to more effectively utilize exhaust energy to achieve boost, which in turn affects the engine's power and economy, etc. Therefore, it is urgent to have the ability to diagnose the boost system, to determine as early as possible whether the boost system has performance problems, and to repair it as soon as possible when problems occur, so as to reduce the impact on the engine's 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 view of the above 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 object, 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 condition of the engine supercharging system is 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] Determine the boost actuator opening standard threshold value based on the boost actuator opening reference value at the current moment, 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 reference value;

[0009] Determine the current working condition, and determine the corresponding opening threshold value 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 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 reference value, including:

[0012]

[0013] Where, pct BoostActuatorLim is the standard threshold value of the boost actuator opening, pct BoostActuatorBase is the boost actuator opening reference value, p AftThrAct is the average value of the actual intake pressure of the engine, p BfThrAct is the actual average pressure at the engine throttle inlet, p BoostDesird is the average value of the target boost pressure, λ is the average value of the air excess coefficient, dm Cylinder is the average value of the actual intake flow rate of the engine, dm CylinderBase It 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 opening reference value of the boost actuator 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 scheme, based on the average opening value of the boost actuator at the current moment, the standard opening threshold of the boost actuator and the corresponding opening threshold, determining whether the engine boost system is abnormal includes:

[0017]

[0018] Where, pct BoostActuator is the average opening degree of the boost actuator, pct BoostActuatorLim is the standard threshold value of the boost actuator opening, Δ 1is the opening threshold corresponding to the working condition at the current moment;

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

[0022] In the above scheme, the current working condition is determined, and the corresponding opening threshold is determined based on the current working condition, including:

[0023] Δ 1 =C×(1+r Adapt )

[0024] In the formula, Δ 1 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, it is determined whether the engine supercharging system is abnormal based on the opening threshold corresponding to the operating condition at the current moment.

[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, the average actual engine intake flow, the average engine water temperature, the average engine ignition angle efficiency and the average target boost pressure all meet the preset value range of a certain operating condition, it is considered that the current operating condition belongs to the corresponding operating condition type.

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

[0029] After the abnormality detection of the engine supercharging system 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 supercharging 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] In the formula, r Adapt (z) is the self-learning correction value of the last updated learning; after the update is completed, the number of times CNT1, number of times 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] In the formula, r Adapt (z) is the self-learning correction value of the last updated learning; after the update is completed, the number of times CNT1, number of times CNT2 and mileage L are all cleared to 0;

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

[0037] In the above scheme, 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 abnormality detection conditions of the engine boost system include:

[0039] The boost control is in a 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 a 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 a 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 basic ignition angle efficiency fluctuation is within the preset range;

[0053] The engine did not experience a fuel shortage;

[0054] EGR rate is 0;

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

[0056] No failure 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, for acquiring, when an abnormality detection condition of 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 unit, for determining a standard threshold of the boost actuator opening based on a current boost actuator opening reference value, an average value of an actual engine intake pressure, an average value of an actual engine throttle inlet pressure, an average value of a target boost pressure, an average value of an air excess coefficient, an average value of an actual engine intake flow rate, and a reference value of an actual engine intake flow rate;

[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 degree of the supercharging actuator at the current moment, the standard opening degree threshold of the supercharging actuator and the corresponding opening degree threshold.

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

[0067] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned methods for detecting abnormality in an engine boost system.

[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 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 target boost pressure average value, 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, and determines the working condition at the current moment, determines the corresponding opening threshold based on the working condition at the current moment, and finally determines whether the engine boost system is abnormal based on the current boost actuator opening average value, the boost actuator opening standard threshold and the corresponding opening threshold. The present invention can identify the influence of intake pressure and the like on the boost actuator opening without affecting the normal control of the engine, and update the standard threshold of the boost actuator opening. At the same time, as the engine life cycle progresses and as the boost system ages, the opening threshold for judging the boost system failure is updated in real time, and whether the boost system capacity is abnormal is identified, so that when a problem occurs, maintenance can be carried out as soon as possible, thereby reducing the impact on the engine power and economy. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0074] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 can 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 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, and do not indicate or imply that the referred device or element 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] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in 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 abnormality detection conditions of the engine supercharging system are met, obtain the current 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.

[0081] First of all, 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 intake pressure of the engine (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, ±2 kPa is taken.

[0085] (4) The target intake pressure of the engine (the target intake pressure at the throttle outlet, i.e. the target pressure of the gas 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 varies 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 fluctuation of the boost actuator is within a preset range, which is ±1% in this example.

[0089] (8) The target boost pressure (for details, see patent CN202010109549.X "Method and storage medium for determining target boost pressure of an exhaust gas turbocharger engine") fluctuates within a preset range, and in this example, it 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 fluctuates 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 the basic ignition angle efficiency can be found in patent CN202110717601.4 "Calculation method, computer equipment and storage medium for basic ignition efficiency of the engine") fluctuates within a preset range, and in this example, it is ±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 faults 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 the above conditions are met for more than the preset time t0 (2s in this example). If the above conditions are not all met during the supercharged engine boost rationality diagnosis, the diagnosis is terminated. The supercharged system performance fault data can be recorded and collected again after the conditions are met again in this driving cycle.

[0104] After entering the turbocharged engine turbocharging rationality diagnosis, the engine speed, actual engine intake flow, engine water temperature, engine ignition angle efficiency, and target turbocharging pressure are obtained, and the average engine speed, average actual engine intake flow, average engine water temperature, average engine ignition angle efficiency, and average target turbocharging pressure are calculated. Each average value is the average value of the corresponding value of several consecutive sampling cycles.

[0105] The system will divide multiple working conditions in advance based on the average engine speed, average actual engine intake 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 flow, average engine water temperature, average engine ignition angle efficiency, and average target boost pressure all meet the preset value range of a certain working condition, then the current working condition is considered to belong to the corresponding working condition. Subsequent abnormal judgments on the engine boost system and updates of self-learning correction values ​​are all performed under the same working condition type.

[0106] At the same time, the current average value of the boost actuator opening, the base value of the boost 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 boost pressure, the average value of the air excess coefficient, the average value of the actual engine intake flow rate and the base value of the actual engine intake flow rate are also 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 reference value.

[0108] Booster actuator opening standard threshold pct BoostActuatorLim With the boost actuator opening reference value pct BoostActuatorBase , the average actual pressure at the engine throttle inlet p BfThrAct , the average value of the actual engine intake pressure p AftThrAct , average value of excess air coefficient λ, average value of actual engine intake flow dm Cylinder 、Target boost pressure average value p BoostDesird , the actual engine intake flow rate 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 mixed gas, 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] The actual engine intake flow rate reference value dm CylinderBase , is the reference value of the intake flow rate, which is 15g / s in this example, where 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 a normal boost system was installed on the test bench to adjust different λ parameter verification ensures that the normal boost system will not 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, it is determined whether the engine supercharging system is abnormal based on the opening threshold corresponding to the operating condition at the current moment.

[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 of the supercharging actuator, and the corresponding opening threshold.

[0127] The average value of the boost actuator opening degree 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 reasonable fault in the boost pressure.

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

[0129]

[0130] When the above formula is satisfied, it indicates that the boost rationality failure has occurred once, otherwise it indicates that the boost rationality failure has not occurred. Once the number of times the boost rationality failure has not been confirmed exceeds the preset number of times, which is 50 times in this example, it indicates that the boost rationality failure has occurred. After the boost capacity fails, the boost rationality diagnosis will no longer be performed until the fault is cleared by the after-sales 4S shop.

[0131] Among them, Δ 1 is the opening threshold, Δ 1 =C×(1+r Adapt ), C is a constant, which is 0.2 in this example. Adapt is the self-learning correction value, with an initial value of 0, and can be saved when the vehicle is powered off. During each driving cycle of the vehicle, the boost rationality fault is detected at most once. If the detection has been completed, the current driving cycle will not be detected again until the next driving cycle of the vehicle meets the diagnostic conditions. After each detection is completed, the number of times the diagnosis is satisfied CNT1 and the number of times the diagnosis is not faulty CNT2 will be 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 updated learning. After the update is completed, CNT1, CNT2 and L are all cleared to 0, and then accumulated and updated 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 updated learning. After the update is completed, CNT1, CNT2 and L are all cleared to 0, and then accumulated and updated 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 why the value reduced by each update (in this example, 0.02 each time) is small is that the update of the threshold value will not make it more difficult to diagnose the fault. It is mainly because the probability of supercharging failure is greater during the continuous advancement of the supercharging life cycle, so as to avoid the loss of engine power and economy due to the failure to timely determine the supercharging failure. In addition, the self-learning correction value update learning is only for the threshold value under the current working condition, and other working 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 present application embodiment also provides an engine boost system abnormality detection device, such as Figure 3 As shown, including:

[0139] The data acquisition unit 501 is used to acquire the average value of the boost actuator opening, the reference value of the boost 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 boost 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 when the abnormality detection condition of the engine boost system is met;

[0140] The standard threshold unit 502 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;

[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 used to determine whether the engine supercharging system is abnormal based on the average opening degree of the supercharging actuator at the current moment, the standard opening degree threshold of the supercharging actuator and the corresponding opening degree threshold.

[0143] like Figure 4 The figure is 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 an independent server, or a server cluster composed of multiple servers) that can execute programs. The computer device 20 of this embodiment includes at least but is not limited to: a memory 21 and a processor 22 that can communicate with each other via a system bus, such as Figure 4 It should be pointed out that Figure 4 Only computer device 20 is shown with components 21 - 22 , but it should be understood that implementing all of the components shown is not a requirement, and more or fewer components may alternatively be implemented.

[0144] In this embodiment, the memory 21 (i.e., readable storage medium) includes flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), 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, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device 20. 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 in 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 data that have been output or are to be output.

[0145] The processor 22 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip in some embodiments. 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 run the program code stored in the memory 21 or process data, such as running a device storing the program code of the engine supercharging system abnormality detection method to implement the engine supercharging 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., SD or DX memory, etc.), 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 the program realizes the corresponding function when executed by the processor. 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 realized.

[0147] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may 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 may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include 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 generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0151] In summary, the present invention proposes an engine boost system abnormality detection method, device, equipment and medium, which can identify the influence of intake pressure and the like on the boost actuator opening 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 difference of boost system failure is updated in real time, and whether the boost system capacity is abnormal is identified. When problems occur, maintenance can be carried out as soon as possible, thereby reducing the impact on the engine 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 the present 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, and 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 only 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 protection scope of the present invention.

Claims

1. A method for detecting abnormality of an engine supercharging system, characterized in that: The method includes: When the abnormality detection condition of the engine supercharging system is 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; Determine the boost actuator opening standard threshold value based on the boost actuator opening reference value at the current moment, 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 reference value; Determine the current working condition, and determine the corresponding opening threshold value 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 method for detecting abnormality of an engine supercharging system according to claim 1, characterized in that: 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 reference value, the boost actuator opening standard threshold is determined, including: Where, pct BoostActuatorLim is the standard threshold value of the boost actuator opening, pct BoostActuatorBase is the boost actuator opening reference value, p AftThrAct is the actual average intake pressure of the engine, p BfThrAct is the actual average pressure at the engine throttle inlet, p BoostDesird is the average value of the target boost pressure, λ is the average value of the air excess coefficient, dm Cylinder is the average value of the actual intake flow rate of the engine, dm CylinderBase It is the actual intake air flow reference value of the engine; Based on and The coefficient of determination, Based on λ and Determined coefficient.

3. The method for detecting abnormality of an engine supercharging system according to claim 2, characterized in that: The method for obtaining the boost actuator opening reference value is: 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.

4. The method for detecting abnormality of an engine supercharging system according to claim 2, 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, pct BoostActuator is the average opening degree of the boost actuator, pct BoostActuatorLim is the standard opening threshold of the boost actuator, Δ1 is the opening threshold corresponding to the working condition at the current moment; If the above formula is satisfied, it indicates that the engine boost system has not confirmed a fault once, otherwise it indicates that the engine boost system has not failed; if the number of times the engine boost system has not confirmed a fault exceeds a preset number, it indicates that the engine boost system has failed.

5. The method for detecting abnormality of an engine supercharging system according to claim 4, characterized in that: The coefficient determination method is: 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 the engine supercharging system does not fail, the formula for determining whether the engine supercharging system is abnormal is not satisfied.

6. The method for detecting abnormality of an engine supercharging system 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: Δ1=C×(1+r Adapt ) In the formula, Δ1 is the opening threshold, C is a constant, r Adapt 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, it is determined whether the engine supercharging system is abnormal based on the opening threshold corresponding to the operating condition at the current moment.

7. The method for detecting abnormality of an engine supercharging system according to claim 6, characterized in that: Determine the operating condition type according to the average engine speed, the average actual engine intake flow, the average engine water temperature, the average engine ignition angle efficiency and the average target boost pressure; If the average engine speed, the average actual engine intake flow, the average engine water temperature, the average engine ignition angle efficiency and the average target boost pressure all meet the preset value range of a certain operating condition, it is considered that the current operating condition belongs to the corresponding operating condition type.

8. The method for detecting abnormality of an engine supercharging system according to claim 6, characterized in that: The self-learning correction value update method is: After the abnormality detection of the engine supercharging system 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; If the number CNT1 is greater than the first preset value, the vehicle mileage L used for abnormality detection of the engine supercharging system exceeds the preset mileage value, and the number CNT2 is 0, the self-learning correction value r Adapt Updated to: r Adapt ＝r Adapt (z)-0.02 In the formula, r Adapt (z) is the self-learning correction value of the last updated learning; After the update is completed, the 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 r Adapt Updated to: r Adapt ＝r Adapt (z)+0.01 In the formula, r Adapt (z) is the self-learning correction value of the last updated learning; After the update is completed, the times CNT1, CNT2 and mileage L are all cleared to 0; In other cases, r Adapt =r Adapt (z).

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

10. The method for detecting abnormality of an engine supercharging system according to claim 1, characterized in that: Abnormal detection conditions of the engine boost system include: The boost control is in a 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 a 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 a 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 basic ignition angle efficiency fluctuation is within the preset range; The engine did not lose fuel; EGR rate is 0; There is no fault in the sensors related to the boost system; No failure 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.

11. An abnormality detection device for an engine supercharging system, characterized in that: include: a data acquisition unit, for acquiring, when an abnormality detection condition of 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; A standard threshold unit, for determining a standard threshold of the boost actuator opening based on a current boost actuator opening reference value, an average value of an actual engine intake pressure, an average value of an actual engine throttle inlet pressure, an average value of a target boost pressure, an average value of an air excess coefficient, an average value of an actual engine intake flow rate, and a reference value of an actual engine intake flow rate; 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 degree of the supercharging actuator at the current moment, the standard opening degree threshold of the supercharging actuator and the corresponding opening degree threshold.

12. 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 the processor implements the steps of the engine boost system abnormality detection method as claimed in any one of claims 1 to 10 when executing the computer program.

13. 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 10 are implemented.

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