Cylinder head cover assembly, engine, vehicle, and leak diagnosis method

Abstract

The application provides a cylinder head cover assembly, an engine, a vehicle and a leakage diagnosis method. The cylinder head cover assembly comprises a cylinder head cover body, a pressure regulating valve, a first built-in pipeline, a second built-in pipeline and a switching valve. The pressure regulating valve is arranged on the cylinder head cover body and communicates with a crankcase. The first built-in pipeline is arranged inside the cylinder head cover body and connected between the pressure regulating valve and an intake manifold. The second built-in pipeline is arranged inside the cylinder head cover body and connected between the pressure regulating valve and an external ventilation pipeline. The switching valve is arranged inside the cylinder head cover body and connected between the first built-in pipeline and the second built-in pipeline. In a non-diagnosis working condition, the switching valve disconnects the first built-in pipeline and the second built-in pipeline; in a diagnosis working condition, the switching valve connects the first built-in pipeline and the second built-in pipeline to perform leakage diagnosis on at least the external ventilation pipeline. The embodiment of the application improves the integration and response speed of the diagnosis system by establishing a diagnosis loop inside the cylinder head cover.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a cylinder head cover assembly, an engine, a vehicle, and a method for diagnosing leaks. Background Technology

[0002] Under stringent emission regulations, leak diagnosis of crankcase ventilation systems has become an industry necessity. However, existing diagnostic components are typically externally mounted, resulting in large engine space requirements, numerous piping interfaces, and a high risk of external leaks. Furthermore, the low integration of diagnostic piping in related technologies increases assembly complexity and hardware costs. Summary of the Invention

[0003] This application provides an improved cylinder head cover assembly, engine, vehicle, and leak diagnosis method.

[0004] This application provides a cylinder head cover assembly for an engine having a crankcase, an intake manifold, and external ventilation piping. The cylinder head cover assembly includes: Cylinder head cover body; A pressure regulating valve is located on the cylinder head cover body and is connected to the crankcase; The first built-in pipeline is located inside the cylinder head cover body and is connected between the pressure regulating valve and the intake manifold; A second internal pipeline is located inside the cylinder head cover body and connects the pressure regulating valve to the external ventilation pipeline; and A switching valve is located inside the cylinder head cover body and is connected between the first internal pipeline and the second internal pipeline; In non-diagnostic conditions, the switching valve disconnects the first built-in pipeline from the second built-in pipeline; in diagnostic conditions, the switching valve connects the first built-in pipeline from the second built-in pipeline to perform leak diagnosis on at least the external ventilation pipeline.

[0005] Optionally, the cylinder head cover assembly includes a pressure sensor located in the first or second internal pipeline to detect the pressure within the corresponding internal pipeline.

[0006] Optionally, the first built-in pipe and the second built-in pipe are flow channels integrally formed inside the cylinder head cover body.

[0007] Optionally, the cylinder head cover body is further provided with a bypass branch connecting the first built-in pipeline and the second built-in pipeline, and the switching valve is disposed in the bypass branch.

[0008] Optionally, the pressure regulating valve is configured to be closed under the negative pressure transmitted by the intake manifold through the first internal pipeline during the diagnostic operation, thereby cutting off the connection between the crankcase and the first internal pipeline.

[0009] This application also provides an engine, comprising: Crankcase, intake manifold and external ventilation piping; and As described in any of the above embodiments, the cylinder head cover assembly has a pressure regulating valve connected to the crankcase, a first internal pipe connected to the intake manifold, and a second internal pipe connected to the external ventilation pipe.

[0010] Optionally, the engine further includes a pressure sensor for acquiring the pressure in the pipeline passage for leak diagnosis under diagnostic conditions; wherein the pressure sensor is built into the intake manifold or located in the external ventilation duct.

[0011] Optionally, the engine further includes an engine controller electrically connected to the switching valve. The engine controller is used to control the opening and closing of the switching valve and to acquire engine operating parameter signals under the diagnostic conditions to perform leak diagnosis on the external ventilation duct.

[0012] This application also provides a vehicle including an engine as described in any of the above embodiments.

[0013] This application also provides a leakage diagnosis method, applied to an engine as described in any of the above embodiments, the diagnosis method comprising: In response to the engine entering diagnostic mode, the control switching valve connects the first internal pipeline and the second internal pipeline; Acquire a detection signal, wherein the detection signal includes at least one of a pressure signal and an engine operating parameter signal; Based on the detection signal, determine whether there is a leak in the external ventilation duct.

[0014] Optionally, the criteria for determining whether the engine enters diagnostic operating conditions include: The engine was detected to be idling. Under the idling condition, the negative pressure generated in the intake manifold causes the pressure regulating valve to switch to the closed state, thereby cutting off the connection between the crankcase and the first internal pipeline.

[0015] Optionally, acquiring the detection signal includes acquiring a pressure signal; The step of determining whether there is a leak in the external ventilation duct based on the detection signal includes: After the switching valve is connected, the pressure signal collected by the pressure sensor is acquired; When the pressure value represented by the pressure signal does not meet the preset pressure threshold, it is determined that there is a leak in the external ventilation duct.

[0016] Optionally, acquiring the detection signal includes acquiring engine operating parameter signals; The step of determining whether there is a leak in the external ventilation duct based on the detection signal includes: After the switching valve is connected, the engine operating parameter signal is acquired; When the engine operating parameter signal deviates from the preset reference value, it is determined that there is a leak in the external ventilation pipeline.

[0017] This application also provides an electronic device, including: Memory, used to store computer programs; A processor is configured to implement the leak diagnosis method as described in any of the above embodiments when executing the computer program.

[0018] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the leakage diagnosis method as described in any of the above embodiments.

[0019] The cylinder head cover assembly of this application integrates the switching valve and multiple built-in ventilation pipes inside the cylinder head cover body, which can reduce the number of external pipes and connection ports, not only reducing the system space occupied, but also reducing potential leakage points from the source; at the same time, by establishing a diagnostic circuit inside the cylinder head cover through the switching valve, the integration and response speed of the diagnostic system are improved. Attached Figure Description

[0020] Figure 1 The diagram shown is a structural schematic of one embodiment of the engine of this application.

[0021] Figure 2 As shown Figure 1 The diagram shows a structural schematic of an embodiment of the cylinder head cover assembly of the engine in a non-diagnostic operating condition.

[0022] Figure 3 As shown Figure 1 A schematic diagram of one embodiment of the diagnostic condition of the engine cylinder head cover assembly shown.

[0023] Figure 4 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the engine cylinder head cover assembly shown.

[0024] Figure 5 As shown Figure 1A schematic diagram of another embodiment of the diagnostic condition of the engine cylinder head cover assembly shown.

[0025] Figure 6 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the cylinder head cover assembly of the engine shown.

[0026] Figure 7 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the engine cylinder head cover assembly shown.

[0027] Figure 8 The diagram shown is a flowchart of one embodiment of the leakage diagnosis method of this application.

[0028] Figure 9 The diagram shown is a structural block diagram of an embodiment of the electronic device of this application. Detailed Implementation

[0029] The cylinder head cover assembly, engine, vehicle, and leakage diagnosis method of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0030] Figure 1 The diagram shown is a structural schematic of one embodiment of the engine 1 of this application. Figure 1 In the illustrated embodiment, engine 1 includes an intake manifold 101, a turbocharger 102, a turbocharger pipe 103, a throttle valve 104, an intake manifold 105, an engine cylinder 106, a crankcase 107, an external ventilation manifold 108, and a cylinder head cover assembly 20. The turbocharger 102 is connected between the intake manifold 101 and the turbocharger pipe 103. The throttle valve 104 is located between the turbocharger pipe 103 and the intake manifold 105. The intake manifold 105 is connected to the engine cylinder 106. The engine cylinder 106 and the cylinder head cover assembly 20 are located on top of the crankcase 107.

[0031] Figure 2 As shown Figure 1 A schematic diagram of an embodiment of the cylinder head cover assembly 20 of engine 1 in a non-diagnostic operating condition. Figure 3 As shown Figure 1 This is a schematic diagram of one embodiment of the diagnostic condition of the cylinder head cover assembly 20 of engine 1 shown. (In conjunction with...) Figures 1 to 3As shown, the cylinder head cover assembly 20 is used in engine 1. The cylinder head cover assembly 20 includes a cylinder head cover body 21, a pressure regulating valve 22, a first internal pipe 23, a second internal pipe 24, and a switching valve 25. The pressure regulating valve 22 is located in the cylinder head cover body 21 and communicates with the crankcase 107. The first internal pipe 23 is located inside the cylinder head cover body 21 and connects the pressure regulating valve 22 to the intake manifold 105. The second internal pipe 24 is located inside the cylinder head cover body 21 and connects the pressure regulating valve 22 to the external ventilation pipe 108. The switching valve 25 is located inside the cylinder head cover body 21 and connects the first internal pipe 23 and the second internal pipe 24.

[0032] exist Figure 1 and Figure 2 In the illustrated embodiment, under non-diagnostic operating conditions, fresh air enters the turbocharger 102 through the intake manifold 101, and is then pressurized by the turbocharger 102 before entering the throttle valve 104 within the turbocharger manifold 103. The throttle valve 104 is an adjustable valve used to adjust the amount of intake air, ranging from 100% fully open to 0% fully closed. Air then enters the intake manifold 105 through the throttle valve 104, which distributes the air to different engine cylinders 106 of the engine 1 for combustion. Inside the engine 1, the pistons begin to move, compressing and expanding the gases. Simultaneously, gases from the crankcase 107 pass through gaps and other areas from inside the engine 1, passing through the pressure regulating valve 22 of the cylinder head cover assembly 20. In this situation, the switching valve 25 disconnects the first internal pipe 23 from the second internal pipe 24. The pressure regulating valve 22 is connected to the external ventilation pipe 108 through the second internal pipe 24. The air is returned to the intake manifold 101 via the external ventilation duct 108, and the pressure regulating valve 22 returns another portion to the intake manifold 105 via the first internal duct 23. In this non-diagnostic condition, the switching valve 25 is in the off state, and the first internal duct 23 is disconnected from the second internal duct 24. In this non-diagnostic condition, the pressure regulating valve 22 operates normally without any specific state.

[0033] exist Figures 1 to 3In the illustrated embodiment, during engine diagnostic operation, when the throttle valve 104 is closed and the engine 1 is idling, the intake manifold 105 generates negative pressure. This negative pressure acts on the pressure regulating valve 22 via the first built-in pipe 23, driving its internal diaphragm to close against spring force, cutting off the gas path on the crankcase 107 side. At this time, the switching valve 25 is opened by command, connecting the first built-in pipe 23 and the second built-in pipe 24, connecting the first built-in pipe 23, the second built-in pipe 24, and the external ventilation pipe 108 in series, forming a closed negative pressure circuit powered by the intake manifold 105, to at least diagnose leaks in the external ventilation pipe 108. If the external ventilation pipe 108 is damaged, atmospheric infiltration will cause the negative pressure in the circuit to decay rapidly. The system captures engine operating parameter signals in real time or monitors the pressure in the first or second built-in pipe and compares it with a preset reference value. When the deviation exceeds a threshold, the system can accurately locate the leak fault and trigger an alarm, thus diagnosing the external ventilation path.

[0034] When abnormal engine operating parameter signals are detected, or when negative pressure in the first or second internal pipe is detected within an abnormal range, it indicates a leak in the external ventilation system, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormal engine operating parameter signals are detected, or when negative pressure in the first or second internal pipe is detected within a normal range, it indicates that there is no leak in the external ventilation system.

[0035] The cylinder head cover assembly 20 of this application integrates the switching valve 25 and multiple built-in ventilation pipes inside the cylinder head cover body 21, which reduces the number of external pipes and connection ports, thereby reducing system space occupation and minimizing potential leakage points. Simultaneously, the switching valve establishes a diagnostic circuit inside the cylinder head cover, improving the integration and response speed of the diagnostic system.

[0036] exist Figures 1 to 3 In the illustrated embodiment, the first built-in pipe 23 and the second built-in pipe 24 are integrally formed flow channels inside the cylinder head cover body 21. This embodiment uses integrally formed flow channels to further eliminate the leakage risk caused by pipe joints, enhance the structural strength of the component, and reduce the complexity of production and assembly. In some other embodiments, the first built-in pipe 23 and the second built-in pipe 24 may also be separate structures for easy disassembly or maintenance, which is not limited in this application.

[0037] exist Figures 1 to 3In the illustrated embodiment, the cylinder head cover body 21 is further provided with a bypass branch 26 connecting the first built-in pipe 23 and the second built-in pipe 24, and the switching valve 25 is disposed in the bypass branch 26. In this embodiment, diagnostic switching is performed through the bypass branch 26, which can ensure flexible access to diagnostic functions without affecting the smoothness of the ventilation path and optimize the flow field distribution inside the system.

[0038] exist Figures 1 to 3 In the illustrated embodiment, the pressure regulating valve 22 is configured to be closed under diagnostic conditions due to the negative pressure transmitted from the intake manifold 105 via the first internal pipe 23, thereby cutting off the connection between the crankcase 107 and the first internal pipe 23. This embodiment utilizes the negative pressure characteristic to achieve adaptive closure of the pressure regulating valve 22, automatically cutting off interference on the crankshaft 107 side without the need for additional electronic actuators, forming a closed diagnostic environment, which simplifies system logic and reduces hardware costs.

[0039] Figure 4 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the cylinder head cover assembly 20 of the engine 1 shown. Figure 5 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the cylinder head cover assembly 20 of the engine 1 shown. Figure 4 and Figure 5 The illustrated embodiments and Figure 3 The embodiments shown are similar, the main difference being that... Figure 4 and Figure 5 In the illustrated embodiment, the cylinder head cover assembly 20 includes a pressure sensor 27, which is located in either the first internal conduit 23 or the second internal conduit 24 to detect the pressure within the corresponding internal conduit. Figure 4 In the illustrated embodiment, the pressure sensor 27 is located in the first built-in conduit 23. Figure 5 In the illustrated embodiment, the pressure sensor 27 is located in the second built-in pipeline 24. In this embodiment, the pressure sensor 27 is integrated into the internal pipeline of the cylinder head cover assembly 20, which can more directly and accurately obtain the pressure inside the diagnostic circuit, avoid signal attenuation or lag caused by transmission through long external pipelines, and improve sensing accuracy.

[0040] Figure 6 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the cylinder head cover assembly 20 of the engine 1 shown. Figure 7 As shown Figure 1 A schematic diagram of another embodiment of the diagnostic condition of the cylinder head cover assembly 20 of the engine 1 shown. Figure 6 and Figure 7 The illustrated embodiments and Figure 4 and Figure 3 The embodiments shown are similar, the main difference being that... Figure 6 and Figure 7 In the illustrated embodiment, pressure sensor 27 is used to acquire the pressure within the pipeline passage for leak diagnosis under diagnostic conditions. Pressure sensor 27 is either built into the intake manifold 105 or located in the external ventilation duct 108. Figure 6 In the illustrated embodiment, pressure sensor 27 is located in intake manifold 105. Figure 7 In the illustrated embodiment, the pressure sensor 27 is located in the external ventilation duct 108. This embodiment provides a flexible arrangement of the pressure sensor 27, which can be used to take pressure in the intake manifold 105 or the external ventilation duct 108, offering strong compatibility and reducing the burden of system modification.

[0041] In some embodiments, the engine 1 further includes an engine controller (not shown), electrically connected to the switching valve 25. The engine controller 28 is used to control the on / off state of the switching valve 25 and to acquire engine operating parameter signals under diagnostic conditions to perform leak diagnosis on the external ventilation duct 108. In some embodiments, the switching valve 25 may be an electronically controlled valve, and the engine controller is electrically connected to the switching valve 25 to control its on / off state. This embodiment achieves automated diagnostic control through an electronic control unit and uses engine operating parameter signals or pressure within the first built-in duct 23 or the second built-in duct 24 for auxiliary judgment, realizing a highly efficient diagnostic mode of hardware and software collaboration. In other embodiments, the switching valve may be a pneumatic valve, a mechanical valve, or other forms of valve assembly, which are not limited in this application.

[0042] This application also provides a vehicle, including as described above. Figures 1 to 7 Engine 1 is shown in the embodiment. The vehicle in this embodiment is equipped with the above-described engine. Figures 1 to 7 The engine 1 shown in the embodiment can improve the level of vehicle emissions monitoring and ensure that the vehicle meets stringent environmental standards throughout its entire life cycle.

[0043] Figure 8 The diagram shown is a flowchart of one embodiment of the leakage diagnosis method of this application. (In conjunction with...) Figures 1 to 8 As shown, the leak diagnosis method is applied to the above-mentioned... Figures 1 to 7 The engine in any of the embodiments has a leak diagnosis method including steps S1 to S3.

[0044] Step S1: In response to the engine entering diagnostic mode, when the throttle valve 104 is closed and the engine 1 is idling, negative pressure is generated in the intake manifold 105. This negative pressure acts on the pressure regulating valve 22 via the first internal pipe 23, driving its internal diaphragm to close against the spring force, cutting off the gas path on the crankcase 107 side. At this time, the switching valve 25 is in the conducting state, controlling the switching valve 25 to connect the first internal pipe 23 and the second internal pipe 24, so that the first internal pipe 23 and the second internal pipe 24 are interconnected. At this time, the first internal pipe 23, the second internal pipe 24 and the external ventilation pipe 108 are connected in series, forming a closed negative pressure circuit with the intake manifold 105 as the power source.

[0045] Step S2: Acquire detection signals. Detection signals include at least one of pressure signals and engine operating parameter signals. In this step, leakage diagnosis of the external ventilation duct 108 can be performed by monitoring for abnormal engine operating parameter signals or detecting abnormal negative pressure within the first built-in pipe 23 or the second built-in pipe 24.

[0046] Step S3: Determine whether there is a leak in the external ventilation duct 108 based on the detection signal. In this step, the presence of a leak in the external ventilation duct 108 can be determined by monitoring abnormal engine operating parameter signals or detecting that the negative pressure in the first built-in duct 23 or the second built-in duct 24 is within an abnormal range, thereby diagnosing the leakage situation of the external ventilation duct 108.

[0047] When abnormal engine operating parameter signals are detected, or when negative pressure in the first or second internal piping is detected within an abnormal range, it indicates a leak in the external ventilation piping, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormal engine operating parameter signals are detected, or when negative pressure in the first or second internal piping is detected within a normal range, it indicates no leak in the external ventilation piping. This configuration, based on the diagnostic process of the integrated cylinder head cover assembly 20, supports the fusion and judgment of multiple signals, ensuring the scientific validity and accuracy of the leak diagnosis conclusion.

[0048] In some embodiments, the criteria for determining whether the engine enters the diagnostic condition include detecting that the engine is in an idling condition. In the idling condition, the negative pressure generated in the intake manifold 105 causes the pressure regulating valve 22 to switch to a closed state, thereby cutting off the connection between the crankcase 107 and the first internal pipeline 23. In this embodiment, the idling diagnostic window is precisely locked, and the stable negative pressure environment at idle ensures the reliability and stability of the pressure regulating valve 22's closure.

[0049] In some embodiments, step S2, acquiring the detection signal includes acquiring a pressure signal. Step S3, determining whether there is a leak in the external ventilation duct based on the detection signal, includes: acquiring the pressure signal collected by the pressure sensor 27 after the switching valve 25 is connected. When the pressure value represented by the pressure signal does not meet the preset pressure threshold, it is determined that there is a leak in the external ventilation duct 108. Under diagnostic conditions, when the throttle valve 104 is closed and the engine 1 is idling, the intake manifold 105 generates negative pressure. This negative pressure acts on the pressure regulating valve 22 through the first built-in pipe 23, driving its internal diaphragm to close against the spring force, cutting off the gas path on the crankcase 107 side. At this time, the switching valve 25 is opened by command, and the switching valve 25 connects the first built-in pipe 23 and the second built-in pipe 24, connecting the first built-in pipe 23, the second built-in pipe 24 and the external ventilation duct 108 in series, forming a closed negative pressure circuit with the intake manifold 105 as the power source, to diagnose leaks in the external ventilation duct 108. The presence of a leak in the external ventilation duct 108 can be determined by monitoring the negative pressure within the first built-in pipe 23 or the second built-in pipe 24 within an abnormal range. When the negative pressure within the first built-in pipe 23 or the second built-in pipe 24 is detected to be within an abnormal range, it indicates a leak in the external ventilation duct 108, and a leak alarm will be issued, at which point the diagnosis ends. When the negative pressure within the first built-in pipe 23 or the second built-in pipe 24 is monitored to be within a normal range, it indicates that there is no leak in the external ventilation duct. This embodiment quantifies complex fluid states into easily comparable pressure values, resulting in high accuracy and a low false alarm rate for leaks.

[0050] In some embodiments, step S2, acquiring the detection signal includes acquiring engine operating parameter signals. Engine operating parameter signals can be engine operating data such as fuel correction coefficient, intake air volume deviation, idle speed control duty cycle, or instantaneous speed fluctuations, and are not limited in this application. Step S3, determining whether there is a leak in the external ventilation pipe based on the detection signal, includes: acquiring engine operating parameter signals after the switching valve is connected. When the engine operating parameter signal shows a preset deviation relative to a preset reference value, it is determined that there is a leak in the external ventilation pipe 108. Under diagnostic conditions, when the throttle valve 104 is closed and the engine 1 is idling, the intake manifold 105 generates negative pressure. This negative pressure acts on the pressure regulating valve 22 via the first built-in pipe 23, driving its internal diaphragm to close against the spring force, cutting off the gas path on the crankcase 107 side. At this time, the switching valve 25 is opened upon command, connecting the first internal pipe 23 and the second internal pipe 24, thus connecting the first internal pipe 23, the second internal pipe 24, and the external ventilation pipe 108 in series, forming a closed negative pressure circuit powered by the intake manifold 105, for leak diagnosis of the external ventilation pipe 108. Leakage in the external ventilation pipe 108 can be determined by monitoring whether abnormal engine operating parameter signals occur. When an abnormal engine operating parameter signal is detected, it indicates a leak in the external ventilation pipe, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormal engine operating parameter signal is detected, it indicates that there is no leak in the external ventilation pipe 108. This embodiment utilizes engine operating parameter signals as a diagnostic supplement. Even with limited pressure sensor 27, the leak diagnosis method can accurately identify abnormal operating conditions caused by air leakage, increasing the redundancy and backup capability of the diagnostic system.

[0051] Figure 9 The diagram shown is a structural block diagram of an embodiment of the electronic device of this application. The electronic device includes a memory and a processor. The memory is used to store a computer program. The processor is used to implement the leak diagnosis method as described in any of the above embodiments when executing the computer program. A structural block diagram of an embodiment of the electronic device. Figure 9 As shown, the electronic device includes one or more processors 31 for implementing, Figure 8 The leakage diagnosis method shown in the embodiment. The computer storage medium 32 of this application embodiment stores a program that, when executed by a processor, implements the method described above. Figure 8 The leakage diagnosis method is illustrated in the embodiment. The computer-readable storage medium 32 may store a program that can be invoked by the processor 31, and may include a non-volatile storage medium. In some embodiments, the processor 31 may include memory 33 and an interface 34. In some embodiments, the processor 31 may also include other hardware depending on the specific application.

[0052] This application may take the form of a computer program product implemented on one or more computer-readable storage media 32 (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. The computer-readable storage media 32 includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented using any method or technology. The information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer-readable storage media 32 include, but are not limited to: phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0053] It should be understood that this application is not limited to the content already described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A cylinder head cover assembly for an engine having a crankcase, an intake manifold, and external ventilation ducts, characterized in that, The cylinder head cover assembly includes: Cylinder head cover body; A pressure regulating valve is located on the cylinder head cover body and is connected to the crankcase; The first built-in pipeline is located inside the cylinder head cover body and is connected between the pressure regulating valve and the intake manifold; A second internal pipeline is located inside the cylinder head cover body and connects the pressure regulating valve to the external ventilation pipeline; and A switching valve is located inside the cylinder head cover body and is connected between the first internal pipeline and the second internal pipeline; In non-diagnostic conditions, the switching valve disconnects the first built-in pipeline from the second built-in pipeline; in diagnostic conditions, the switching valve connects the first built-in pipeline from the second built-in pipeline to perform leak diagnosis on at least the external ventilation pipeline.

2. The cylinder head cover assembly according to claim 1, characterized in that, The cylinder head cover assembly includes a pressure sensor, which is located in the first internal pipeline or the second internal pipeline to detect the pressure within the corresponding internal pipeline.

3. The cylinder head cover assembly according to claim 1, characterized in that, The first built-in pipe and the second built-in pipe are integrally formed into the flow channels inside the cylinder head cover body.

4. The cylinder head cover assembly according to claim 1, characterized in that, The cylinder head cover body is also provided with a bypass branch connecting the first built-in pipeline and the second built-in pipeline, and the switching valve is located in the bypass branch.

5. The cylinder head cover assembly according to claim 1, characterized in that, The pressure regulating valve is configured such that, under the diagnostic conditions, it is closed due to the negative pressure transmitted by the intake manifold through the first internal pipeline, thereby cutting off the connection between the crankcase and the first internal pipeline.

6. An engine, characterized in that, include: Crankcase, intake manifold and external ventilation piping; and The cylinder head cover assembly as described in any one of claims 1 to 5, wherein the pressure regulating valve of the cylinder head cover assembly is connected to the crankcase, the first internal pipe is connected to the intake manifold, and the second internal pipe is connected to the external ventilation pipe.

7. The engine according to claim 6, characterized in that, The engine also includes a pressure sensor for acquiring the pressure in the pipeline passage for leak diagnosis under diagnostic conditions; wherein the pressure sensor is built into the intake manifold or located in the external ventilation duct.

8. The engine according to claim 6, characterized in that, The engine also includes an engine controller electrically connected to the switching valve. The engine controller is used to control the opening and closing of the switching valve and to acquire engine operating parameter signals under the diagnostic conditions to diagnose leaks in the external ventilation duct.

9. A vehicle, characterized in that, Includes the engine as described in any one of claims 6 to 8.

10. A leak diagnosis method, applied to an engine as described in any one of claims 6 to 8, characterized in that, The diagnostic method includes: In response to the engine entering diagnostic mode, the control switching valve connects the first internal pipeline and the second internal pipeline; Acquire a detection signal, wherein the detection signal includes at least one of a pressure signal and an engine operating parameter signal; Based on the detection signal, determine whether there is a leak in the external ventilation duct.

11. The leakage diagnosis method according to claim 10, characterized in that, The conditions for determining whether the engine enters diagnostic operating condition include: The engine was detected to be idling. Under the idling condition, the negative pressure generated in the intake manifold causes the pressure regulating valve to switch to the closed state, thereby cutting off the connection between the crankcase and the first internal pipeline.

12. The leakage diagnosis method according to claim 10, characterized in that, The acquisition of the detection signal includes acquiring the pressure signal; The step of determining whether there is a leak in the external ventilation duct based on the detection signal includes: After the switching valve is connected, the pressure signal collected by the pressure sensor is acquired; When the pressure value represented by the pressure signal does not meet the preset pressure threshold, it is determined that there is a leak in the external ventilation duct.

13. The leakage diagnosis method according to claim 10, characterized in that, The acquisition of detection signals includes acquiring engine operating parameter signals; The step of determining whether there is a leak in the external ventilation duct based on the detection signal includes: After the switching valve is connected, the engine operating parameter signal is acquired; When the engine operating parameter signal deviates from the preset reference value, it is determined that there is a leak in the external ventilation pipeline.

14. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for implementing the leak diagnosis method as described in any one of claims 10 to 13 when executing the computer program.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the leak diagnosis method as described in any one of claims 10 to 13.

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