AVU fault diagnosis processing method and system

Abstract

The AVU fault diagnosis processing method comprises the steps that when it is judged that the real-time supercharging pressure is too low, an AVU control deflation mode is switched into a supercharging pressure control deflation mode, after switching, whether the real-time supercharging pressure is too low or not is judged again, and if yes, it is judged that an air inlet manifold of an engine leaks air; and if not, determining that the AVU has a fault. When it is found that the real-time supercharging pressure of the supercharging system is low in the AVU control deflation mode, the deflation mode is switched from the AVU control deflation mode to the supercharging pressure control deflation mode instead of directly judging AVU faults, after the AVU control deflation mode is switched to the supercharging pressure control deflation mode, whether the real-time supercharging pressure of the supercharging system is low or not is judged again, and if yes, the real-time supercharging pressure of the supercharging system is not low. According to the method, the AVU mechanical fault and the engine intake manifold air leakage fault can be distinguished through the judgment logic, the fault diagnosis precision of the supercharging system is improved, fault processing operations such as torque limiting are prevented from being directly adopted, and the fault handling precision and effect are improved.

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, in simple terms, Figure 1 As shown, the exhaust gas discharged 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 larger the exhaust volume, the faster the turbine 2 rotates. The 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. The impeller 4 rotates under the drive of the turbine 2 to pressurize the air, and the pressurized high-pressure air is delivered to the engine through the impeller outlet 8, thereby increasing the engine's air intake. The AVU (Air Valve Unit) can control the exhaust volume of the engine exhaust gas entering the turbine end (the exhaust gas volume entering the turbine end to drive the turbine 2 is called the engine exhaust gas volume entering the turbine end), so that all or part of the exhaust gas enters the turbine end.

[0003] Specifically, if Figure 1 and 2 As shown, the engine exhaust gas enters the supercharger from the turbine exhaust gas inlet 5, and the high-pressure exhaust gas drives the turbine 2 at the vortex end of the supercharger to rotate, thereby driving the pump wheel 4 at the compression end to rotate, and then compresses the air coming in from the pump wheel air inlet 7, and the generated high-pressure and high-density air is output from the pump wheel air outlet 8. The higher the engine speed and load, the greater the exhaust gas energy, the higher the speed of the turbine 2 and the pump wheel 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, the pneumatic actuator 9 can be driven 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 pneumatic actuator 9 is driven to work by the output pressure of the AVU controlled by the ECU. 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 pump 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 pressure of the air release valve not releasing air, excessive releasing air, and AVU controlled releasing air. 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 may lead to the following risks: the engine intake volume will increase, resulting in supercharger overspeed, supercharged air overheating, high engine oxygen content, and nitrogen oxides NO X Excessive bleeding will result in low boost pressure, which will lead to the following risks: less engine air intake, less oxygen content in the engine, poor combustion, poor power and economy, black smoke, and excessive exhaust temperature. AVU controls bleeding, and controls the boost pressure of each operating condition in detail according to the performance of power, economy, emissions, and exhaust temperature, so as to achieve the best engine performance.

[0007] AVU faults mainly include circuit faults and mechanical faults. Circuit faults such as open circuit and short circuit faults are mainly diagnosed by pin voltage signals, which will not be discussed here. Mechanical faults such as blockage and stagnation of components such as outlet valve seat, inlet valve seat, spring, etc., cause AVU to be unable to control the boost pressure, resulting in high or low boost pressure.

[0008] There is currently 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 cannot be distinguished logically. When a mechanical failure occurs in the AVU, the ECU's response can only be to limit the torque based on the failure of the 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 that AVU fault diagnosis and processing lacks a reasonable strategy and has poor accuracy and effect.

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

[0011] 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.

[0012] In combination with the first aspect, in one implementation, 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 combination with the first aspect, in one implementation, the determining whether the real-time boost pressure is abnormal comprises the following specific steps:

[0015] The required boost pressure is subtracted from the actual boost pressure to obtain the pressure deviation;

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

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

[0018] When it is judged that the real-time boost pressure is too low, the AVU control air release mode is switched to the boost pressure control air release 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 implementation, the method further includes:

[0021] 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;

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

[0023] In combination with the first aspect, in one implementation, 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 processing system, the AVU fault diagnosis 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 too low. After the switch, it is again determined 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.

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

[0028] In combination with the second aspect, in one implementation, 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 implementation, when the processing module determines that the boost pressure control and bleed mode operation time is not less than a preset time, it determines that the boost pressure control and bleed mode has a fault and performs corresponding torque limiting operation on the engine.

[0031] The beneficial effects brought by the technical solution 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 an 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 determined to be an engine intake manifold fault, if not, it is determined to be an AVU fault. Through this judgment logic, AVU mechanical faults and engine intake manifold leakage faults can be distinguished, thereby improving the fault diagnosis accuracy of the supercharging system, avoiding direct fault handling operations such as torque limiting, and improving the fault response accuracy and effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] Figure 2 This is the second structural schematic 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 the present 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-pump housing; 4-pump 4; 5-turbine exhaust gas inlet; 6-turbine exhaust gas outlet; 7-pump air inlet; 8-pump air outlet; 9-pneumatic actuator; 10-bleed valve; 11-collection module; 22-processing module. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, 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 the present application are explained to facilitate those skilled in the art to understand the present application.

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present 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 the present 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 deflation mode is switched to the boost pressure control deflation mode. After the switch, it is determined again 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 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.

[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 an 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 faults and engine intake manifold leakage faults can be distinguished, thereby improving the fault diagnosis accuracy of the boost system, avoiding direct fault handling operations such as torque limiting, and improving the fault response accuracy and effectiveness.

[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, the AVU failure causes insufficient bleed air at the turbocharger vortex end, and the exhaust gas at the vortex end causes the turbine speed to be too high. The turbine drives the pump wheel to rotate at a high speed, and the pump wheel pressurizes the air entering the compression end to a high degree, which ultimately causes the air pressure delivered from the compression end to the engine intake manifold to be too high, that is, the real-time boost pressure value is too high. The boost pressure sensor can be set at the engine intake manifold. The real-time boost pressure value output by the boost pressure sensor is too high. There may be two reasons: one is that the boost pressure sensor itself fails, and the other is that the AVU failure causes insufficient bleed air at the turbocharger vortex 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 whether 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 high, and the AVU is not faulty, nor is the real-time boost pressure value high due to a fault in the AVU. If the judgment result is no, it means that the boost pressure sensor is not faulty, nor is the real-time boost pressure value it outputs to be high due to a fault in the boost pressure sensor, but the AVU fault causes the real-time boost pressure value to be high.

[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 and lower pressure limits a and b of the AVU control deflation mode. If the pressure deviation is greater than the upper pressure limit a, it is determined that the real-time boost pressure is too high. If the pressure deviation is less than the lower pressure limit b, it is determined that the real-time boost pressure is too low.

[0055] In this embodiment, the upper and lower pressure differential limits of the boost system when using the AVU controlled bleed mode are different from those of the boost pressure controlled bleed mode. Regardless of whether the current mode is the AVU controlled bleed mode or the boost pressure controlled bleed 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 differential limits of the AVU controlled bleed 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 cancelled. If not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0059] In this embodiment, when it is determined that the real-time boost pressure is 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 is switched, it means that the real-time boost pressure is low due to a faulty air leakage in the engine intake manifold. At this time, the AVU fault alarm is cancelled. In this process, the user can timely grasp the situation of the fault alarm of the boost system through the AVU fault alarm, and can also timely grasp the specific cause of the boost system failure by canceling the AVU fault alarm. If the real-time boost pressure is no longer low after the mode is switched, it means that the real-time boost pressure is low due to an AVU fault. At this time, the AVU fault alarm continues to be output to remind the user to deal with the AVU fault in time.

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

[0061] When it is determined that the real-time boost pressure is too 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 greater than the preset time, an AVU fault alarm is output.

[0063] In this embodiment, if the real-time low boost pressure has existed in the AVU controlled air bleeding mode for more than a preset time, such as 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 the present application. Figure 5 As shown, the AVU fault diagnosis and processing system includes:

[0069] The acquisition module 1 is used to acquire real-time boost pressure.

[0070] The processing module 22 is used to switch the AVU control air release mode to the boost pressure control air release mode when it is determined that the real-time boost pressure is low. 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. If not, it is determined 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 an 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 faults and engine intake manifold leakage faults can be distinguished, thereby improving the fault diagnosis accuracy of the boost system, avoiding direct fault handling operations such as torque limiting, and improving the fault response accuracy and effectiveness.

[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, the AVU failure causes insufficient bleed air at the turbocharger vortex end, and the exhaust gas at the vortex end causes the turbine speed to be too high. The turbine drives the pump wheel to rotate at a high speed, and the pump wheel pressurizes the air entering the compression end to a high degree, which ultimately causes the air pressure delivered from the compression end to the engine intake manifold to be too high, that is, the real-time boost pressure value is too high. The boost pressure sensor can be set at the engine intake manifold. The real-time boost pressure value output by the boost pressure sensor is too high. There may be two reasons: one is that the boost pressure sensor itself fails, and the other is that the AVU failure causes insufficient bleed air at the turbocharger vortex 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 whether 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 high, and the AVU is not faulty, nor is the real-time boost pressure value high due to a fault in the AVU. If the judgment result is no, it means that the boost pressure sensor is not faulty, nor is the real-time boost pressure value it outputs to be high due to a fault in the boost pressure sensor, but the AVU fault causes the real-time boost pressure value to be high.

[0075] Furthermore, in one embodiment, when the processing module 22 determines whether the real-time boost pressure is abnormal, the required boost pressure is subtracted 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 deflation mode. If the pressure deviation is greater than the upper pressure difference limit, the real-time boost pressure is judged to be too high. If the pressure deviation is less than the lower pressure difference limit, the real-time boost pressure is judged to be too low.

[0077] In this embodiment, the upper and lower pressure differential limits of the boost system when using the AVU controlled bleed mode are different from those of the boost pressure controlled bleed mode. Regardless of whether the current mode is the AVU controlled bleed mode or the boost pressure controlled bleed 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 differential limits of the AVU controlled bleed 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 too 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 cancelled. If not, it is determined that the AVU is faulty and the AVU fault alarm continues to be output.

[0080] In this embodiment, when it is determined that the real-time boost pressure is 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 is switched, it means that the real-time boost pressure is low due to a faulty air leakage in the engine intake manifold. At this time, the AVU fault alarm is cancelled. In this process, the user can timely grasp the situation of the fault alarm of the boost system through the AVU fault alarm, and can also timely grasp the specific cause of the boost system failure by canceling the AVU fault alarm. If the real-time boost pressure is no longer low after the mode is switched, it means that the real-time boost pressure is low due to an AVU fault. At this time, the AVU fault alarm continues to be output to remind the user to deal with the AVU fault in time.

[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 operation time is not greater than a preset time, the processing module 22 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 greater than the preset time, an AVU fault alarm is output.

[0083] In this embodiment, if the real-time low boost pressure has existed in the AVU controlled air bleeding mode for more than a preset time, such as 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 air bleeding mode is operating for a duration not less than a preset duration, it determines that the boost pressure control and air bleeding mode is faulty and performs 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 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, the memory, and the communication interface.

[0090] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces, which are used to interconnect the devices inside the AVU fault diagnosis and processing device, and interfaces used to interconnect the AVU fault diagnosis and processing device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[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, and the general-purpose processor may call the AVU fault diagnosis processing program stored in the memory and execute the AVU fault diagnosis processing method provided in the embodiment 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 called may refer to the various embodiments of the AVU fault diagnosis processing method of the present application, and will not be repeated 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 the present 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 only for description 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 "first", "second" and "third" to different types.

[0098] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

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

[0102] The above are only preferred embodiments of the present application, and are not intended to 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 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. 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.

2. The AVU fault diagnosis and processing method according to claim 1, characterized in that: 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, characterized in that: The specific steps of judging whether the real-time boost pressure is abnormal are as follows: The required boost pressure is subtracted from the actual boost pressure to obtain the pressure deviation; The pressure deviation is compared with the upper and lower pressure difference limits of the AVU control deflation mode. If the pressure deviation is greater than the upper pressure difference limit, it is determined that the real-time boost pressure is too high. If the pressure deviation is less than the lower pressure difference limit, it is determined that the real-time boost pressure is too low.

4. The AVU fault diagnosis and processing method according to claim 1, characterized in that: The method further comprises: When it is judged that the real-time boost pressure is too low, the AVU control air release mode is switched to the boost pressure control air release 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, characterized in that: The method further comprises: 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; When it is determined that the real-time boost pressure is too low and the AVU control air release mode operation time is greater than the preset time, an AVU fault alarm is output.

6. The AVU fault diagnosis and processing method according to claim 1, characterized in that: 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 comprises: 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 too low. After the switch, it is again determined 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.

8. The AVU fault diagnosis and processing system according to claim 7, characterized in that: The processing module is also used to determine whether the boost pressure sensor is faulty when it is determined that the real-time boost pressure is too high. If so, it is determined that the AVU is not faulty; if not, it is determined that the AVU is faulty.

9. The AVU fault diagnosis and processing system according to claim 7, characterized in that: 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, characterized in that: 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 is faulty and performs corresponding torque limiting operation on the engine.

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