AVU fault diagnosis and processing method and system

Abstract

A method and system for diagnosing and processing an AVU fault includes, when it is determined that the real-time boost pressure is too low, switching the AVU control bleed mode to the boost pressure control bleed mode, after switching, again determining whether the real-time boost pressure is too low, if so, determining that the engine intake manifold is leaking; otherwise, determining that the AVU fault is present. This application switches the bleed mode from the AVU control bleed mode to the boost pressure control bleed mode when it is found that the real-time boost pressure of the boost system is too low in the AVU control bleed mode, instead of directly determining an AVU fault. After switching to the boost pressure control bleed mode, it is again determined whether the real-time boost pressure of the boost system is too low, if so, determining that it is an engine intake manifold fault, if not, determining that it is an AVU fault. This judgment logic can distinguish between AVU mechanical faults and engine intake manifold leakage faults, improve the diagnostic accuracy of the boost system fault, avoid directly adopting fault handling operations such as torque limiting, and improve the accuracy and effectiveness of fault response.

Description

Technical Field

[0001] The present application relates to the field of supercharger fault processing, and specifically to an AVU fault diagnosis and processing method and system. Background Art

[0002] The basic working principle of the supercharger is as follows: Figure 1 As shown, exhaust gas emitted by the engine enters the turbine housing 1 through the turbine exhaust inlet 5 at the turbine end, driving the turbine 2 in the turbine housing 1 to rotate rapidly. The greater the exhaust volume, the faster the turbine 2 rotates. Air enters the impeller housing 3 through the impeller air inlet 7 at the compression end. The impeller 4 in the impeller housing 3 is connected to the turbine 2. Driven by the turbine 2, the impeller 4 rotates to pressurize the air, and the pressurized high-pressure air is delivered to the engine through the impeller air outlet 8, thereby increasing the engine's air intake. The AVU (Air Valve Unit) can control the amount of engine exhaust gas entering the turbine end (the amount of exhaust gas entering the turbine end to drive the turbine 2 is called the engine exhaust gas entering the turbine end), allowing all or part of the exhaust gas to enter the turbine end.

[0003] Specifically, if Figure 1 and 2 As shown, engine exhaust enters the supercharger through turbine exhaust inlet 5. The high-pressure exhaust gas drives the turbine 2 at the turbocharger's vortex end, which in turn drives the impeller 4 at the compression end. This in turn compresses the air entering through the impeller inlet 7, producing high-pressure, high-density air that is discharged through the impeller outlet 8. The higher the engine speed and load, the greater the exhaust gas energy, the higher the speed of the turbine 2 and impeller 4, and the greater the boost pressure of the compressed air.

[0004] The boost pressure controlled bleed mode includes that after the pressurized air reaches a certain pressure, it can drive the pneumatic actuator 9 to work, and the bleed valve 10 is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet 6, reducing the exhaust gas energy that drives the supercharger. The AVU controlled bleed mode includes that the pressurized air does not drive the bleed valve 10, and the output pressure of the AVU controlled by the ECU drives the pneumatic actuator 9 to work, and the bleed valve 10 is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet 6, reducing the exhaust gas energy that drives the supercharger. The main function of the bleed valve 10 is to appropriately adjust the exhaust gas energy, thereby adjusting the supercharger speed, the temperature of the air after supercharging, and the intake volume. In the existing supercharging system, the AVU control abandonment mode is used by default.

[0005] AVU controls the air release valve of the supercharger by adjusting the output pressure, so that the supercharger's boost pressure (i.e. the gas pressure delivered from the impeller outlet 8 to the engine intake manifold) can be controlled within a certain range, thereby selecting the optimal boost pressure to achieve the effect of taking into account the performance, emissions and supercharger protection of different working conditions. Figure 3As shown, the three curves represent the boost pressures of the air release valve not releasing air, excessive releasing air, and AVU controlled releasing air, respectively. The three boost pressure curves correspond to the following characteristics:

[0006] If the air is not released, the boost pressure will be too high, which will lead to the following risks: the engine intake volume will increase, causing the supercharger to overspeed, the air after supercharging to overheat, and the engine oxygen content to be high, resulting in nitrogen oxides NO X Excessive bleed air can lead to low boost pressure, which can lead to reduced engine air intake, low oxygen levels, poor combustion, reduced power and economy, black smoke, and excessive exhaust temperatures. AVU-controlled bleed air optimizes engine performance by carefully adjusting boost pressure for each operating condition based on power, economy, emissions, and exhaust temperature.

[0007] AVU faults primarily include electrical and mechanical failures. Electrical faults, such as open and short circuits, are primarily diagnosed based on pin voltage signals and are not discussed here. Mechanical faults, such as blockage or seizure of components like the outlet and inlet valve seats and springs, can cause the AVU to lose control of boost pressure, resulting in either high or low boost pressure.

[0008] Currently, there is no diagnostic strategy for AVU mechanical failures. Both AVU mechanical failures and engine intake manifold leakage failures will result in low boost pressure, and they are logically indistinguishable. When an AVU mechanical failure occurs, the ECU's response can only be to limit torque based on the fault of boost pressure exceeding the maximum limit, which has a significant impact on engine performance. Summary of the Invention

[0009] The present application provides an AVU fault diagnosis and processing method and system, which can solve the technical problems in the prior art of AVU fault diagnosis and processing that lack reasonable strategies and have poor accuracy and effect.

[0010] In a first aspect, an embodiment of the present application provides an AVU fault diagnosis and processing method, the AVU fault diagnosis and processing method comprising:

[0011] When it is judged that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode. After switching, it is judged again whether the real-time boost pressure is too low. If so, it is determined that the engine intake manifold is leaking; if not, it is determined that the AVU is faulty.

[0012] In combination with the first aspect, in one embodiment, the method further includes:

[0013] When it is determined that the real-time boost pressure is too high, it is determined whether the boost pressure sensor is faulty. If so, it is determined that the AVU is not faulty; if not, it is determined that the AVU is faulty.

[0014] In conjunction with the first aspect, in one embodiment, the determining whether the real-time boost pressure is abnormal comprises the following specific steps:

[0015] The pressure deviation is obtained by subtracting the required boost pressure from the actual boost pressure;

[0016] The pressure deviation is compared with the upper and lower pressure difference limits of the AVU control bleed mode. If the pressure deviation is greater than the upper pressure difference limit, the real-time boost pressure is determined to be too high. If the pressure deviation is less than the lower pressure difference limit, the real-time boost pressure is determined to be too low.

[0017] In combination with the first aspect, in one embodiment, the method further includes:

[0018] When it is determined that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode, and an AVU fault alarm is output;

[0019] After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is cancelled; if not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0020] In combination with the first aspect, in one embodiment, the method further includes:

[0021] When it is determined that the real-time boost pressure is low and the AVU control air release mode is running for no longer than the preset time, the AVU control air release mode is switched to the boost pressure control air release mode, and an AVU fault alarm is output;

[0022] When it is determined that the real-time boost pressure is too low and the AVU control air release mode operation time is longer than the preset time, an AVU fault alarm is output.

[0023] In combination with the first aspect, in one embodiment, the method further includes:

[0024] When it is determined that the operating time of the boost pressure control and air bleeding mode is not less than the preset time, it is determined that the boost pressure control and air bleeding mode has failed, and a corresponding torque limiting operation is performed on the engine.

[0025] In a second aspect, an embodiment of the present application provides an AVU fault diagnosis and processing system, the AVU fault diagnosis and processing system comprising:

[0026] The processing module is used to switch the AVU control bleed mode to the boost pressure control bleed mode when it is determined that the real-time boost pressure is low. After switching, it is again determined whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking; if not, it is determined that the AVU is faulty.

[0027] In combination with the second aspect, in one embodiment, the processing module is further configured to determine whether the boost pressure sensor is faulty when determining that the real-time boost pressure is too high. If so, the AVU is determined to be faulty; if not, the AVU is determined to be faulty.

[0028] In conjunction with the second aspect, in one embodiment, when the processing module determines that the real-time boost pressure is low, the processing module switches the AVU control air release mode to the boost pressure control air release mode and outputs an AVU fault alarm;

[0029] After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is cancelled; if not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0030] In combination with the second aspect, in one embodiment, when the processing module determines that the boost pressure control and bleed mode has run for a duration not less than a preset duration, it determines that the boost pressure control and bleed mode has failed and performs corresponding torque limiting operation on the engine.

[0031] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0032] When it is found that the real-time boost pressure of the supercharging system is low in the AVU controlled air bleed mode, the air bleed mode is switched from the AVU controlled air bleed mode to the boost pressure controlled air bleed mode, instead of directly judging the AVU fault. After switching to the boost pressure controlled air bleed mode, it is judged again whether the real-time boost pressure of the supercharging system is low. If so, it is judged to be an engine intake manifold fault. If not, it is judged to be an AVU fault. Through this judgment logic, the AVU mechanical fault and the engine intake manifold leakage fault can be distinguished, the fault diagnosis accuracy of the supercharging system can be improved, and the direct use of fault handling operations such as torque limiting can be avoided, thereby improving the accuracy and effect of fault response. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 One of the structural diagrams of the increaser in the prior art;

[0034] Figure 2 This is the second structural diagram of a supercharger in the prior art;

[0035] Figure 3 is an external characteristic curve between engine speed and supercharger boost pressure in the prior art;

[0036] Figure 4 This is a flowchart of an embodiment of the AVU fault diagnosis and processing method of this application.

[0037] Figure 5 This is a functional module diagram of an embodiment of the AVU fault diagnosis and processing system of the present application.

[0038] Reference numerals:

[0039] 1-turbine housing; 2-turbine; 3-impeller housing; 4-impeller 4; 5-turbine exhaust gas inlet; 6-turbine exhaust gas outlet; 7-impeller air inlet; 8-impeller air outlet; 9-pneumatic actuator; 10-bleed valve; 11-acquisition module; 22-processing module. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] First, some technical terms in this application are explained to facilitate those skilled in the art to understand this application.

[0042] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0043] In a first aspect, an embodiment of the present application provides an AVU fault diagnosis and processing method.

[0044] In one embodiment, referring to Figure 4 , Figure 4 This is a flow chart of the first embodiment of the AVU fault diagnosis and processing method of this application. Figure 4 As shown, the AVU fault diagnosis and processing method includes:

[0045] Step S1: When it is determined that the real-time boost pressure is low, the AVU control air release mode is switched to the boost pressure control air release mode. After the switch, it is again determined whether the real-time boost pressure is low:

[0046] When it is determined that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode. After switching, it is determined again whether the real-time boost pressure is too low. If so, it is determined that the engine intake manifold is leaking. If not, it is determined that the AVU is faulty.

[0047] In this embodiment, since the default bleed mode of the boost system is the AVU controlled bleed mode, when it is found that the real-time boost pressure of the boost system is low in the AVU controlled bleed mode, the bleed mode is switched from the AVU controlled bleed mode to the boost pressure controlled bleed mode, instead of directly judging the AVU fault. After switching to the boost pressure controlled bleed mode, it is judged again whether the real-time boost pressure of the boost system is low. If so, it is determined that it is an engine intake manifold fault. If not, it is determined that it is an AVU fault. Through this judgment logic, the AVU mechanical fault and the engine intake manifold leakage fault can be distinguished, thereby improving the fault diagnosis accuracy of the boost system, avoiding the direct use of fault handling operations such as torque limiting, and improving the fault response accuracy and effect.

[0048] Furthermore, in one embodiment, the AVU fault diagnosis and processing method further includes:

[0049] When it is determined that the real-time boost pressure is too high, it is determined whether the boost pressure sensor is faulty. If so, it is determined that the AVU is not faulty. If not, it is determined that the AVU is faulty.

[0050] In this embodiment, an AVU failure results in insufficient bleed air from the turbocharger's turbine end. Exhaust from the turbine causes the turbine to rotate at a higher speed, which in turn drives the impeller at a higher speed. This results in the impeller applying a higher degree of boost to the air entering the compression end, ultimately leading to an increased pressure on the air delivered from the compression end to the engine's intake manifold, and consequently, an increased real-time boost pressure value. A boost pressure sensor, typically located in the engine's intake manifold, may output an increased real-time boost pressure value. This could be due to two reasons: a malfunction in the boost pressure sensor itself, or an AVU failure leading to insufficient bleed air from the turbocharger's turbine end.

[0051] Since the default bleed mode of the boost system is the AVU controlled bleed mode, and the problem of high real-time boost pressure will not occur in the boost pressure controlled bleed mode, therefore, combined with the previous two reasons, when judging that the real-time boost pressure is too high, we must first judge whether the boost pressure sensor used to detect the real-time boost pressure is faulty. If the judgment result is yes, it means that the boost pressure sensor itself is faulty, causing the real-time boost pressure value it outputs to be too high, and the AVU is not faulty, and the real-time boost pressure value is not high due to the fault of the AVU. If the judgment result is no, it means that the boost pressure sensor is not faulty, and the real-time boost pressure value it outputs is not high due to the fault of the boost pressure sensor, but the real-time boost pressure value is high due to the fault of the AVU.

[0052] Furthermore, in one embodiment, the above-mentioned determination of whether the real-time boost pressure is abnormal is performed in the following specific steps:

[0053] The pressure deviation is obtained by subtracting the required boost pressure from the actual boost pressure.

[0054] The pressure deviation is compared with the upper pressure difference a and lower pressure difference b of the AVU control bleed mode. If the pressure deviation is greater than the upper pressure difference a, it is determined that the real-time boost pressure is too high. If the pressure deviation is less than the lower pressure difference b, it is determined that the real-time boost pressure is too low.

[0055] In this embodiment, the upper and lower pressure difference limits of the boost system when adopting the AVU controlled air release mode are different from the upper and lower pressure difference limits when adopting the boost pressure controlled air release mode. Regardless of whether the current mode is the AVU controlled air release mode or the boost pressure controlled air release mode, after taking the difference between the required boost pressure and the actual boost pressure, the pressure deviation is used to compare the upper and lower pressure difference limits of the AVU controlled air release mode, so as to determine whether the real-time boost pressure is too high or too low, thereby achieving accurate judgment of AVU faults.

[0056] Furthermore, in one embodiment, the above method further includes:

[0057] When it is determined that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode, and an AVU fault alarm is output.

[0058] After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is canceled. If not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0059] In this embodiment, when the real-time boost pressure is determined to be low, the AVU control bleed mode is switched to the boost pressure control bleed mode, and an AVU fault alarm is output. If the real-time boost pressure is still low after the mode switch, it indicates that the low real-time boost pressure is caused by a faulty air leak in the engine intake manifold. In this case, the AVU fault alarm is canceled. During this process, the user can promptly grasp the presence of a fault alarm in the boost system through the AVU fault alarm, and can also promptly grasp the specific cause of the boost system fault by canceling the AVU fault alarm. If the real-time boost pressure is no longer low after the mode switch, it indicates that the low real-time boost pressure is caused by an AVU fault. In this case, the AVU fault alarm continues to be output, reminding the user to promptly address the AVU fault.

[0060] Furthermore, in one embodiment, the above method further includes:

[0061] When it is determined that the real-time boost pressure is low and the AVU control air release mode operation time is not greater than the preset time, the AVU control air release mode is switched to the boost pressure control air release mode, and an AVU fault alarm is output.

[0062] When it is determined that the real-time boost pressure is too low and the AVU control air release mode operation time is longer than the preset time, an AVU fault alarm is output.

[0063] In this embodiment, if the real-time boost pressure is low in the AVU controlled air bleeding mode and the AVU controlled air bleeding mode has been running for more than a preset time, for example, 24 hours, then it means that the action of switching to the boost pressure controlled air bleeding mode may have failed or the AVU fault alarm action has failed or the user has not repaired the AVU in time. At this time, the engine is torque-limited to reduce the real-time boost pressure.

[0064] Furthermore, in one embodiment, the above method further includes:

[0065] When it is determined that the operating time of the boost pressure control and air bleeding mode is not less than the preset time, it is determined that the boost pressure control and air bleeding mode has failed, and a corresponding torque limiting operation is performed on the engine.

[0066] In this embodiment, if the operating time after switching from the AVU controlled air bleed mode to the boost pressure air bleed mode exceeds a preset time, for example, 24 hours, it means that the user has not repaired the AVU in time. At this time, the engine is torque-limited to reduce the real-time boost pressure.

[0067] In a second aspect, an embodiment of the present application also provides an AVU fault diagnosis and processing system.

[0068] In one embodiment, referring to Figure 5 , Figure 5 This is a functional module diagram of an embodiment of the AVU fault diagnosis and processing system of this application. Figure 5 As shown, the AVU fault diagnosis and processing system includes:

[0069] The acquisition module 11 is used to acquire real-time boost pressure.

[0070] The processing module 22 is configured to switch the AVU controlled bleed mode to the boost pressure controlled bleed mode when determining that the real-time boost pressure is low. After switching, the processing module 22 again determines whether the real-time boost pressure is low. If so, it determines that the engine intake manifold is leaking. If not, it determines that the AVU is faulty.

[0071] In this embodiment, the default bleed mode of the boost system is the AVU controlled bleed mode. When it is found that the real-time boost pressure of the boost system is low in the AVU controlled bleed mode, the bleed mode is switched from the AVU controlled bleed mode to the boost pressure controlled bleed mode, instead of directly judging the AVU fault. After switching to the boost pressure controlled bleed mode, it is judged again whether the real-time boost pressure of the boost system is low. If so, it is determined that it is an engine intake manifold fault. If not, it is determined that it is an AVU fault. Through this judgment logic, AVU mechanical fault and engine intake manifold leakage fault can be distinguished, thereby improving the fault diagnosis accuracy of the boost system, avoiding the direct use of fault handling operations such as torque limiting, and improving the fault response accuracy and effect.

[0072] Furthermore, in one embodiment, the processing module 22 is further configured to determine whether the boost pressure sensor is faulty when determining that the real-time boost pressure is too high, and if so, determine that the AVU is not faulty. If not, determine that the AVU is faulty.

[0073] In this embodiment, an AVU failure results in insufficient bleed air from the turbocharger's turbine end. Exhaust from the turbine causes the turbine to rotate at a higher speed, which in turn drives the impeller at a higher speed. This results in the impeller applying a higher degree of boost to the air entering the compression end, ultimately leading to an increased pressure on the air delivered from the compression end to the engine's intake manifold, and consequently, an increased real-time boost pressure value. A boost pressure sensor, typically located in the engine's intake manifold, may output an increased real-time boost pressure value. This could be due to two reasons: a malfunction in the boost pressure sensor itself, or an AVU failure leading to insufficient bleed air from the turbocharger's turbine end.

[0074] Since the default bleed mode of the boost system is the AVU controlled bleed mode, and the problem of high real-time boost pressure will not occur in the boost pressure controlled bleed mode, therefore, combined with the previous two reasons, when judging that the real-time boost pressure is too high, we must first judge whether the boost pressure sensor used to detect the real-time boost pressure is faulty. If the judgment result is yes, it means that the boost pressure sensor itself is faulty, causing the real-time boost pressure value it outputs to be too high, and the AVU is not faulty, and the real-time boost pressure value is not high due to the fault of the AVU. If the judgment result is no, it means that the boost pressure sensor is not faulty, and the real-time boost pressure value it outputs is not high due to the fault of the boost pressure sensor, but the real-time boost pressure value is high due to the fault of the AVU.

[0075] Furthermore, in one embodiment, when the processing module 22 determines whether the real-time boost pressure is abnormal, it subtracts the required boost pressure from the actual boost pressure to obtain a pressure deviation.

[0076] The pressure deviation is compared with the upper and lower pressure difference limits of the AVU control bleed mode. If the pressure deviation is greater than the upper pressure difference limit, the real-time boost pressure is determined to be too high. If the pressure deviation is less than the lower pressure difference limit, the real-time boost pressure is determined to be too low.

[0077] In this embodiment, the upper and lower pressure difference limits of the boost system when adopting the AVU controlled air release mode are different from the upper and lower pressure difference limits when adopting the boost pressure controlled air release mode. Regardless of whether the current mode is the AVU controlled air release mode or the boost pressure controlled air release mode, after taking the difference between the required boost pressure and the actual boost pressure, the pressure deviation is used to compare the upper and lower pressure difference limits of the AVU controlled air release mode, so as to determine whether the real-time boost pressure is too high or too low, thereby achieving accurate judgment of AVU faults.

[0078] Furthermore, in one embodiment, when the processing module 22 determines that the real-time boost pressure is low, it switches the AVU control air release mode to the boost pressure control air release mode and outputs an AVU fault alarm.

[0079] After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is canceled. If not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0080] In this embodiment, when the real-time boost pressure is determined to be low, the AVU control bleed mode is switched to the boost pressure control bleed mode, and an AVU fault alarm is output. If the real-time boost pressure is still low after the mode switch, it indicates that the low real-time boost pressure is caused by a faulty air leak in the engine intake manifold. In this case, the AVU fault alarm is canceled. During this process, the user can promptly grasp the presence of a fault alarm in the boost system through the AVU fault alarm, and can also promptly grasp the specific cause of the boost system fault by canceling the AVU fault alarm. If the real-time boost pressure is no longer low after the mode switch, it indicates that the low real-time boost pressure is caused by an AVU fault. In this case, the AVU fault alarm continues to be output, reminding the user to promptly address the AVU fault.

[0081] Furthermore, in one embodiment, when the processing module 22 determines that the real-time boost pressure is low and the AVU control air release mode has been running for no longer than a preset time, it switches the AVU control air release mode to the boost pressure control air release mode and outputs an AVU fault alarm.

[0082] When it is determined that the real-time boost pressure is too low and the AVU control air release mode operation time is longer than the preset time, an AVU fault alarm is output.

[0083] In this embodiment, if the real-time boost pressure is low in the AVU controlled air bleeding mode and the AVU controlled air bleeding mode has been running for more than a preset time, for example, 24 hours, then it means that the action of switching to the boost pressure controlled air bleeding mode may have failed or the AVU fault alarm action has failed or the user has not repaired the AVU in time. At this time, the engine is torque-limited to reduce the real-time boost pressure.

[0084] Furthermore, in one embodiment, when the processing module 22 determines that the boost pressure control and bleed mode has been in operation for a duration not less than a preset duration, it determines that the boost pressure control and bleed mode has failed and performs a corresponding torque limiting operation on the engine.

[0085] In this embodiment, if the operating time after switching from the AVU controlled air bleed mode to the boost pressure air bleed mode exceeds a preset time, for example, 24 hours, it means that the user has not repaired the AVU in time. At this time, the engine is torque-limited to reduce the real-time boost pressure.

[0086] Among them, the functional implementation of each module in the above-mentioned AVU fault diagnosis and processing system corresponds to the various steps in the above-mentioned AVU fault diagnosis and processing method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0087] In a third aspect, an embodiment of the present application provides an AVU fault diagnosis and processing device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0088] In an embodiment of the present application, the AVU fault diagnosis and processing device may include a processor, a memory, a communication interface, and a communication bus.

[0089] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0090] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, which interconnect components within the AVU fault diagnosis and processing device, as well as interfaces that connect the AVU fault diagnosis and processing device to other devices (such as other computing devices or user devices). Physical interfaces can be Ethernet, fiber, or ATM interfaces; user devices can be displays or keyboards.

[0091] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0092] The processor may be a general-purpose processor that can invoke an AVU fault diagnosis processing program stored in a memory and execute the AVU fault diagnosis processing method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the AVU fault diagnosis processing program is invoked can be referenced to the various embodiments of the AVU fault diagnosis processing method of the present application and will not be further described here.

[0093] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0094] The computer-readable storage medium of the present application stores an AVU fault diagnosis processing program, wherein when the AVU fault diagnosis processing program is executed by the processor, the steps of the AVU fault diagnosis processing method as described above are implemented.

[0095] Among them, the method implemented when the AVU fault diagnosis processing program is executed can refer to the various embodiments of the AVU fault diagnosis processing method of this application, and will not be repeated here.

[0096] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0097] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0098] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0099] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0100] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0101] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0102] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for AVU fault diagnosis and processing, characterized in that: The AVU fault diagnosis and processing method includes: When it is determined that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode. After the switch, it is determined again whether the real-time boost pressure is too low. If so, it is determined that the engine intake manifold is leaking; if not, it is determined that the AVU is faulty. AVU is an air valve that controls the amount of engine exhaust gas entering the turbine end; The boost pressure controlled bleed mode includes that after the pressurized air reaches a certain pressure, it can drive the pneumatic actuator to work, and the bleed valve is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet, reducing the exhaust energy of driving the supercharger; the AVU controlled bleed mode includes that the pressurized air does not drive the bleed valve, and the output pressure of the AVU controlled by the ECU drives the pneumatic actuator to work, and the bleed valve is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet, reducing the exhaust energy of driving the supercharger.

2. The AVU fault diagnosis and processing method according to claim 1, wherein: The method further comprises: When it is determined that the real-time boost pressure is too high, it is determined whether the boost pressure sensor is faulty. If so, it is determined that the AVU is not faulty; if not, it is determined that the AVU is faulty.

3. The AVU fault diagnosis and processing method according to claim 1, wherein: The specific steps for determining whether the real-time boost pressure is abnormal are as follows: The pressure deviation is obtained by subtracting the required boost pressure from the actual boost pressure; The pressure deviation is compared with the upper and lower pressure difference limits of the AVU control bleed mode. If the pressure deviation is greater than the upper pressure difference limit, the real-time boost pressure is determined to be too high. If the pressure deviation is less than the lower pressure difference limit, the real-time boost pressure is determined to be too low.

4. The AVU fault diagnosis and processing method according to claim 1, wherein: The method further comprises: When it is determined that the real-time boost pressure is too low, the AVU control bleed mode is switched to the boost pressure control bleed mode, and an AVU fault alarm is output; After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is cancelled; if not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

5. The AVU fault diagnosis and processing method according to claim 1, wherein: The method further comprises: When it is determined that the real-time boost pressure is low and the AVU control air release mode is running for no longer than the preset time, the AVU control air release mode is switched to the boost pressure control air release mode, and an AVU fault alarm is output; When it is determined that the real-time boost pressure is too low and the AVU control air release mode operation time is longer than the preset time, an AVU fault alarm is output.

6. The AVU fault diagnosis and processing method according to claim 1, wherein: The method further comprises: When it is determined that the operating time of the boost pressure control and air bleeding mode is not less than the preset time, it is determined that the boost pressure control and air bleeding mode has failed, and a corresponding torque limiting operation is performed on the engine.

7. An AVU fault diagnosis and processing system, characterized in that: The AVU fault diagnosis and processing system includes: a processing module configured to switch the AVU control bleed mode to the boost pressure control bleed mode when it is determined that the real-time boost pressure is low, and after the switch, to again determine whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking; if not, it is determined that the AVU is faulty; AVU is an air valve that controls the amount of engine exhaust gas entering the turbine end; The boost pressure controlled bleed mode includes that after the pressurized air reaches a certain pressure, it can drive the pneumatic actuator to work, and the bleed valve is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet, reducing the exhaust energy of driving the supercharger; the AVU controlled bleed mode includes that the pressurized air does not drive the bleed valve, and the output pressure of the AVU controlled by the ECU drives the pneumatic actuator to work, and the bleed valve is opened under the push of the push rod, and part of the exhaust gas is directly discharged to the turbine exhaust outlet, reducing the exhaust energy of driving the supercharger.

8. The AVU fault diagnosis and processing system according to claim 7, wherein: The processing module is further configured to determine whether the boost pressure sensor is faulty when determining that the real-time boost pressure is too high. If so, the AVU is determined to be faulty; if not, the AVU is determined to be faulty.

9. The AVU fault diagnosis and processing system according to claim 7, wherein: When the processing module determines that the real-time boost pressure is low, the processing module switches the AVU control air release mode to the boost pressure control air release mode and outputs an AVU fault alarm; After the switch, it is determined again whether the real-time boost pressure is low. If so, it is determined that the engine intake manifold is leaking and the AVU fault alarm is cancelled; if not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

10. The AVU fault diagnosis and processing system according to claim 7, wherein: When the processing module determines that the operation time of the boost pressure control and air bleeding mode is not less than the preset time, it determines that the boost pressure control and air bleeding mode has failed and performs a corresponding torque limiting operation on the engine.

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