A fault diagnosis method and system for a sequential turbocharging system

Abstract

The application discloses a kind of fault diagnosis method and system of sequential supercharging system, it is related to supercharger system fault detection technical field, comprising: obtaining the speed when supercharger is not involved and the speed in intervention process;According to the speed when supercharger is not involved and the speed in intervention process, the air leakage fault of supercharger is judged, wherein: when the speed when supercharger is not involved is greater than first set threshold value, it is determined that supercharger occurs air leakage fault;When the speed in intervention process of supercharger is first reduced and then increased, it is determined that the air leakage fault of intake valve of supercharger occurs;When the speed in intervention process of supercharger is greater than first set threshold value, and the speed in intervention process is always increased, it is determined that the air leakage fault of exhaust valve of supercharger occurs.Accurate judgment to the air leakage fault of supercharger is realized.

Description

Technical Field

[0001] This invention relates to the field of turbocharger system fault detection technology, and in particular to a fault diagnosis method and system for a sequential turbocharger system. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, many high-power-density diesel engines use sequential turbocharging systems to replace traditional ordinary turbocharging systems. The working principle of a sequential turbocharging system is to use multiple turbochargers, which are put into operation in sequence as the engine speed and load increase. This ensures that the turbochargers always operate in the high-efficiency range, so that the engine has good economic and emission performance indicators throughout the entire operating conditions.

[0004] Currently, by installing intake and exhaust valves at the intake and exhaust ports of the turbocharger respectively, the engagement and disengagement of the turbocharger can be controlled by adjusting the opening of the intake and exhaust valves. When the intake and exhaust valves experience leakage due to jamming, sealing failure, or valve stem breakage, the normal operation of the entire turbocharging system is affected, which in turn affects engine performance.

[0005] Traditional turbocharger fault diagnosis methods primarily involve adding sensors at the intake and exhaust ports to acquire parameters such as inlet and outlet pressures and airflow. These parameters are then analyzed to determine if the turbocharger is experiencing issues like carbon buildup or seizing, leading to leaks. However, sensor malfunctions can affect the fault diagnosis results. Furthermore, the use of numerous sensors and the complexity of the analysis process in traditional turbocharger fault diagnosis methods result in relatively poor stability. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a fault diagnosis method and system for a sequential turbocharger system. By simply acquiring the rotational speed of the turbocharger when it is not engaged and the rotational speed during engagement, the method can accurately diagnose air leakage faults in the sequential turbocharger system, thereby improving the stability of air leakage fault diagnosis.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Firstly, a fault diagnosis method for a sequential booster system is proposed, including:

[0009] Obtain the engine speed when the turbocharger is not engaged and the engine speed during the engagement process;

[0010] Based on the engine speed when the turbocharger is not engaged and the engine speed during engagement, the turbocharger leakage fault is diagnosed, including:

[0011] When the engine speed is greater than the first set threshold when the turbocharger is not engaged, it is determined that the turbocharger has a leak.

[0012] When the speed first decreases and then increases during the turbocharger engagement process, it is determined that the turbocharger's intake valve has a leakage fault.

[0013] When the speed of the turbocharger during the intervention process exceeds the first set threshold and the speed continues to increase during the intervention process, it is determined that the exhaust valve of the turbocharger has a leakage fault.

[0014] Secondly, a fault diagnosis system for a sequential booster system is proposed, including:

[0015] The turbocharger speed acquisition module is used to acquire the speed of the turbocharger when it is not engaged and the speed during the engagement process;

[0016] The turbocharger leakage fault detection module is used to determine the turbocharger leakage fault based on the speed when the turbocharger is not engaged and the speed during the engagement process. Specifically: when the speed when the turbocharger is not engaged is greater than a first set threshold, the turbocharger is determined to have a leakage fault; when the speed during the turbocharger engagement process first decreases and then increases, the turbocharger's intake valve is determined to have a leakage fault; when the speed during the turbocharger engagement process is greater than the first set threshold and the speed during the engagement process continues to increase, the turbocharger's exhaust valve is determined to have a leakage fault.

[0017] Thirdly, an electronic device is proposed, including a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, complete the steps described in a fault diagnosis method for a sequential boosting system.

[0018] Fourthly, a computer-readable storage medium is proposed for storing computer instructions, which, when executed by a processor, complete the steps described in a fault diagnosis method for a sequential boosting system.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention achieves accurate judgment of turbocharger leakage faults simply by obtaining the speed of the turbocharger when it is not engaged and the speed during the engagement process, and then analyzing the speed of the turbocharger when it is not engaged and the speed during the engagement process, thereby improving the speed and stability of turbocharger leakage fault judgment.

[0021] 2. This invention does not require additional hardware; it can accurately diagnose turbocharger leaks using existing equipment, making it easy to implement and reducing costs.

[0022] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] Figure 1 The flowchart is for an embodiment of the disclosed method. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] Example 1

[0028] In this embodiment, a fault diagnosis method for a sequential booster system is disclosed, such as... Figure 1 As shown, it includes:

[0029] Obtain the engine speed when the turbocharger is not engaged and the engine speed during the engagement process;

[0030] Based on the engine speed when the turbocharger is not engaged and the engine speed during engagement, the turbocharger leakage fault is diagnosed, including:

[0031] When the engine speed is greater than the first set threshold when the turbocharger is not engaged, it is determined that the turbocharger has a leak.

[0032] When the speed first decreases and then increases during the turbocharger engagement process, it is determined that the turbocharger's intake valve has a leakage fault.

[0033] When the speed of the turbocharger during the intervention process exceeds the first set threshold and the speed continues to increase during the intervention process, it is determined that the exhaust valve of the turbocharger has a leakage fault.

[0034] The turbocharger operates at different speeds depending on the engine speed. Generally, the higher the engine speed, the higher the turbocharger speed.

[0035] Therefore, in order to ensure that the engine speed is accurately obtained when the turbocharger is not engaged and during the engagement process, and to accurately determine the turbocharger leakage fault based on the engine speed when the turbocharger is not engaged and during the engagement process, the engine speed is first obtained.

[0036] The engine speed is only acquired when it is within the set speed range, and the speed during the turbocharger engagement process is also acquired when the engine speed is within the set speed range.

[0037] The speed range is set according to the testing requirements and engine speed.

[0038] Preferably, the set speed range is [700r / min, 1900r / min].

[0039] When the engine speed is greater than or equal to 700 r / min and less than or equal to 1900 r / min, the engine speed is determined to be within the set speed range.

[0040] To ensure the turbocharger is lubricated when it is not engaged, the exhaust valve will have a certain gap to ensure that the turbocharger can rotate when it is not engaged. Therefore, a second set threshold for the turbocharger speed is set.

[0041] Only when the turbocharger's rotational speed during activation exceeds a second preset threshold is a leak detection mechanism based on that speed. When a leak is detected, a corresponding fault alert is issued. This reduces the computational load for turbocharger leak detection and improves its stability.

[0042] The specific process for diagnosing turbocharger leakage based on the speed during turbocharger activation is as follows:

[0043] If the engine speed decreases and then increases during the turbocharger engagement process, it is determined that the turbocharger's intake valve has a leakage fault, and a fault warning message will be issued. The fault warning message issued at this time is the corresponding fault code, which reminds the user to check and repair the intake valve and related components.

[0044] If the speed during the turbocharger engagement process exceeds the first set threshold and the speed continues to increase during engagement, it is determined that the turbocharger's exhaust valve has a leakage fault. At this time, the fault reminder message issued is the corresponding fault code, which reminds the user to check and repair the exhaust valve and related components.

[0045] Preferably, the rate of change of the turbocharger speed during the turbocharger engagement process is calculated based on the speed during the turbocharger engagement process;

[0046] If the rate of change of speed changes from negative to positive, it is determined that the speed first decreases and then increases during the turbocharger intervention process.

[0047] If the rate of change of speed is always positive, it is determined that the speed is continuously increasing during the turbocharger intervention process.

[0048] The turbocharger's rotational speed during the intervention process is greater than the first set threshold, and the rotational speed continues to increase during the intervention process. This means that the rotational speed of the turbocharger is greater than the first set threshold at a certain moment during the intervention process, and the rotational speed continues to increase after that moment.

[0049] The speed change rate is the difference between the current speed and the previous speed, divided by the difference between the two times. The speed change rate can accurately reflect the speed change process during the turbocharger intervention, thereby enabling accurate detection of turbocharger leakage faults.

[0050] The specific process for diagnosing turbocharger leakage based on the engine speed when the turbocharger is not engaged is as follows:

[0051] If the engine speed is greater than the first set threshold when the turbocharger is not engaged, it indicates that the turbocharger valve is leaking air severely. The turbocharger is then identified as having an air leakage fault, and a fault reminder message is issued indicating that inspection and maintenance are required.

[0052] The first set threshold is greater than the second set threshold, and the first and second set thresholds can be set according to the engine speed and specific detection requirements.

[0053] Preferably, the first threshold is set to 2, and the second threshold is set to 1.

[0054] The method disclosed in this embodiment can accurately determine the turbocharger leakage fault simply by obtaining the speed of the turbocharger when it is not engaged and the speed during the engagement process, and then analyzing the two speeds of the turbocharger. This improves the speed and stability of the turbocharger leakage fault determination. When determining the turbocharger leakage fault, no additional hardware is required. Existing equipment can be used to accurately determine the turbocharger leakage fault, which is easy to implement and can reduce costs.

[0055] The method disclosed in this embodiment is further limited to obtaining the engine speed when the turbocharger is not engaged and the engine speed during the engagement process only when the engine speed is within a set speed range. The program for judging the turbocharger fault based on the engine speed during the engagement process will only be started when the engine speed during the engagement process is greater than a second set threshold. This reduces the amount of calculation when judging the fault and can ensure the accuracy and stability of the fault judgment.

[0056] Example 2

[0057] In this embodiment, a fault diagnosis system for a sequential booster system is disclosed, comprising:

[0058] The turbocharger speed acquisition module is used to acquire the speed of the turbocharger when it is not engaged and the speed during the engagement process;

[0059] The turbocharger leakage fault detection module is used to determine the turbocharger leakage fault based on the speed when the turbocharger is not engaged and the speed during the engagement process. Specifically: when the speed when the turbocharger is not engaged is greater than a first set threshold, the turbocharger is determined to have a leakage fault; when the speed during the turbocharger engagement process first decreases and then increases, the turbocharger's intake valve is determined to have a leakage fault; when the speed during the turbocharger engagement process is greater than the first set threshold and the speed during the engagement process continues to increase, the turbocharger's exhaust valve is determined to have a leakage fault.

[0060] Example 3

[0061] In this embodiment, an electronic device is disclosed, including a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When the processor executes the computer instructions, it completes the steps described in the fault diagnosis method for a sequential boosting system disclosed in Embodiment 1.

[0062] Example 4

[0063] In this embodiment, a computer-readable storage medium is disclosed for storing computer instructions, which, when executed by a processor, complete the steps described in the fault diagnosis method for a sequential boosting system disclosed in Embodiment 1.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A fault diagnosis method for a sequential booster system, characterized in that, include: Obtain the engine speed when the turbocharger is not engaged and the engine speed during the engagement process; Based on the engine speed when the turbocharger is not engaged and the engine speed during engagement, the turbocharger leakage fault is diagnosed, including: When the engine speed is greater than the first set threshold when the turbocharger is not engaged, it is determined that the turbocharger has a leak. When the speed first decreases and then increases during the turbocharger engagement process, it is determined that the turbocharger's intake valve has a leakage fault. When the speed of the turbocharger during the intervention process exceeds the first set threshold and the speed continues to increase during the intervention process, it is determined that the exhaust valve of the turbocharger has a leakage fault.

2. The fault diagnosis method for a sequential booster system as described in claim 1, characterized in that, Get engine speed; When the engine speed is within the set speed range, the engine speed when the turbocharger is not engaged and the engine speed during the engagement process are obtained.

3. The fault diagnosis method for a sequential booster system as described in claim 1, characterized in that, Only when the speed during the turbocharger intervention process exceeds the second set threshold will the turbocharger's air leakage fault be judged based on the speed during the turbocharger intervention process.

4. The fault diagnosis method for a sequential booster system as described in claim 3, characterized in that, The first set threshold is greater than the second set threshold.

5. The fault diagnosis method for a sequential booster system as described in claim 1, characterized in that, When a leak is detected in the turbocharger, a corresponding fault warning message will be issued.

6. The fault diagnosis method for a sequential booster system as described in claim 1, characterized in that, Calculate the rate of change of speed during the turbocharger engagement process based on the speed during turbocharger engagement. If the rate of change of speed changes from negative to positive, it is determined that the speed first decreases and then increases during the turbocharger intervention process. If the rate of change of speed is always positive, it is determined that the speed is continuously increasing during the turbocharger intervention process.

7. The fault diagnosis method for a sequential booster system as described in claim 6, characterized in that, The rate of change of rotational speed is the difference between the current rotational speed minus the previous rotational speed, divided by the difference between the two times.

8. A fault diagnosis system for a sequential booster system, characterized in that, include: The turbocharger speed acquisition module is used to acquire the speed of the turbocharger when it is not engaged and the speed during the engagement process; The turbocharger leakage fault detection module is used to detect turbocharger leakage faults based on the speed of the turbocharger when it is not engaged and the speed during the engagement process. Specifically, when the speed of the turbocharger when it is not engaged is greater than a first set threshold, it is determined that the turbocharger has a leakage fault. When the speed of the turbocharger decreases and then increases during the turbocharger engagement process, it is determined that the intake valve of the turbocharger has a leakage fault; when the speed of the turbocharger during the turbocharger engagement process is greater than the first set threshold and the speed continues to increase during the engagement process, it is determined that the exhaust valve of the turbocharger has a leakage fault.

9. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, complete the steps of a fault diagnosis method for a sequential booster system as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, complete the steps of a fault diagnosis method for a sequential booster system as described in any one of claims 1-7.

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