Crankcase ventilation line assembly, engine, vehicle, and leak diagnosis method

Abstract

The application provides a crankcase ventilation pipeline assembly, an engine, a vehicle and a leakage diagnosis method. The crankcase ventilation pipeline assembly comprises an internal ventilation pipeline, an external ventilation pipeline and a switching valve. The internal ventilation pipeline is arranged inside a cylinder head cover of the engine and is connected with a pressure regulating valve and an intake manifold. The external ventilation pipeline comprises a first ventilation pipeline, a second ventilation pipeline and a bypass pipeline. In a first state, the switching valve is in a first position, the bypass pipeline is disconnected from the first ventilation pipeline and the second ventilation pipeline, and the bypass pipeline is detected. In a second state, the switching valve is switched to a second position, the first ventilation pipeline and the second ventilation pipeline are connected with the bypass pipeline, and the first ventilation pipeline and the second ventilation pipeline are detected. The application effectively solves the problem that a leakage branch cannot be accurately positioned, and improves the accuracy and reliability.

Description

Technical Field

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

[0002] With increasingly stringent emission regulations, existing crankcase ventilation diagnostic solutions mostly employ a one-time, full-loop diagnostic approach. This makes it difficult to accurately locate leaks in complex piping systems, and the diagnostic accuracy is easily affected by interference from multiple branches. Therefore, the industry urgently needs a diagnostic system capable of accurately locating faults in different areas and equipped with sensor element protection functions. Summary of the Invention

[0003] This application provides an improved crankcase ventilation piping assembly, engine, vehicle, and leak diagnosis method.

[0004] This application provides a crankcase ventilation piping assembly for use in an engine, the engine being provided with an intake pipe, an intake manifold, and a pressure regulating valve; the crankcase ventilation piping assembly includes: An internal ventilation duct is located inside the cylinder head cover of the engine and connects the pressure regulating valve to the intake manifold. External ventilation ducts include a first ventilation duct, a second ventilation duct, and a bypass duct; The switching valve is connected to the first ventilation duct, the second ventilation duct, and the bypass duct, respectively. Under diagnostic conditions, the crankcase ventilation piping assembly is configured in a first state and a second state; When in the first state, the switching valve is in the first position, which disconnects the bypass pipeline from the first ventilation pipeline and the second ventilation pipeline, so as to detect the bypass pipeline; When in the second state, the switching valve switches to the second position, connecting the first ventilation duct, the second ventilation duct, and the bypass duct to each other, so as to detect the first ventilation duct and the second ventilation duct.

[0005] Optionally, the crankcase ventilation piping assembly further includes a pressure sensor, which is located at one of the bypass piping, the built-in ventilation piping, the first ventilation piping, the second ventilation piping, the intake manifold, the connection between the crankcase ventilation piping assembly and the pressure regulating valve, the connection of the switching valve's port, the connection between the bypass piping and the intake manifold, and the connection between the bypass piping and the pressure regulating valve.

[0006] Optionally, the crankcase ventilation piping assembly includes a first pilot valve, which is located in one of the bypass piping, the connection port between the switching valve and the bypass piping, and the connection point between the bypass piping and the intake manifold.

[0007] Optionally, the crankcase ventilation piping assembly includes a first pilot valve and a pressure sensor; the first pilot valve and the pressure sensor are integrated and integrated within the connection port between the switching valve and the bypass piping; wherein, the first pilot valve is configured to be in a closed state when the intake manifold is under positive pressure and in a non-diagnostic operating condition, so as to cut off the fluid flow to the pressure sensor.

[0008] Optionally, the pressure sensor is positioned relative to the first pilot valve on the side closer to the switching valve.

[0009] Optionally, the first pilot valve is positioned relative to the pressure sensor on the side closer to the switching valve.

[0010] Optionally, the crankcase ventilation duct assembly includes a second guide valve located at the connection between the second ventilation duct and the intake duct.

[0011] Optionally, the crankcase ventilation duct assembly includes a third pilot valve, located at one of the built-in ventilation duct, the connection between the intake manifold and the built-in ventilation duct, and the connection between the built-in ventilation duct and the pressure regulating valve.

[0012] Optionally, the switching valve includes at least a first connection port, a second connection port, and a third connection port; the first ventilation duct is connected between the pressure regulating valve and the first connection port; the second ventilation duct is connected between the second connection port and the intake duct; and the third connection port is connected to the intake manifold through the bypass duct. When the switching valve is selectively switched to the first position, the third connection port is disconnected from the first connection port and the second connection port, thereby disconnecting the bypass pipe from the first ventilation pipe and the second ventilation pipe; when the switching valve is selectively switched to the second position, the third connection port is connected to both the first connection port and the second connection port, thereby connecting the first ventilation pipe, the second ventilation pipe and the bypass pipe to each other.

[0013] Optionally, the crankcase ventilation piping assembly includes a first pilot valve, a second pilot valve, and a third pilot valve, wherein the first pilot valve, the second pilot valve, and the third pilot valve are all one-way valves.

[0014] This application also provides an engine, comprising: Intake piping, intake manifold, cylinder head cover with pressure regulating valve; and The crankcase ventilation piping assembly as described in any of the above embodiments; wherein, the built-in ventilation piping of the crankcase ventilation piping assembly is located inside the cylinder head cover, and its two ends are respectively connected to the pressure regulating valve and the intake manifold; the first ventilation piping of the crankcase ventilation piping assembly is connected to the pressure regulating valve, the second ventilation piping of the crankcase ventilation piping assembly is connected to the intake pipe, and the bypass piping of the crankcase ventilation piping assembly is connected to the intake manifold.

[0015] This application also provides a vehicle including the engine described in the above embodiments.

[0016] This application also provides a leakage diagnosis method applied to the engine described in the above embodiments, the leakage diagnosis method comprising: In response to the engine entering diagnostic mode, the control switching valve is placed in the first position to obtain a detection signal; Based on the detection signal, determine whether there is a leak in the bypass pipeline; When it is determined that there is no leakage in the bypass pipeline, the switching valve is controlled to switch to the second position, the detection signal is acquired again, and it is determined whether there is a leak in at least one of the first ventilation pipeline and the second ventilation pipeline of the external ventilation pipeline; The detection signal includes at least one of a pressure signal and an engine operating parameter signal.

[0017] Optionally, the engine entering diagnostic mode includes: When the engine is idling, the negative pressure generated in the intake manifold causes the pressure regulating valve to switch to the closed state, thereby sealing the air passage on the cylinder head cover side.

[0018] Optionally, the detection signal includes a pressure signal; Determining whether at least one of the bypass duct, the first ventilation duct, and the second ventilation duct is leaking includes: When the switching valve is in the first position, if the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, it is determined that there is a leak in the bypass pipeline. When the switching valve is switched to the second position, if the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, it is determined that at least one of the first ventilation duct and the second ventilation duct has a leak.

[0019] Optionally, the detection signal includes engine operating parameter signals; Determining whether at least one of the bypass duct, the first ventilation duct, and the second ventilation duct is leaking includes: When the switching valve is in the first position, if a preset deviation is detected in the engine operating parameter signal relative to a preset reference value, it is determined that there is a leak in the bypass pipeline; When the switching valve is switched to the second position, if a preset deviation is detected in the engine operating parameter signal relative to a preset reference value, it is determined that at least one of the first ventilation pipe and the second ventilation pipe has a leak. This application also provides an electronic device, including: Memory, used to store computer programs; A processor is configured to implement the leakage diagnosis and control method as described in any of the above embodiments when executing the computer program.

[0020] 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.

[0021] The crankcase ventilation duct assembly of this application embodiment achieves coordination between the bypass duct and the external ventilation duct through a switching valve, enabling the detection of complex ventilation duct systems in stages and areas, effectively solving the problem of not being able to accurately locate leaking branches, and improving the accuracy and reliability of diagnosis. Attached Figure Description

[0022] Figure 1 The diagram shown is a structural schematic of one embodiment of the engine of this application.

[0023] Figure 2 As shown Figure 1 The diagram shows a structural schematic of an embodiment of an engine operating under non-diagnostic conditions.

[0024] Figure 3 As shown Figure 1 The diagram shows a structural schematic of an embodiment of the crankcase ventilation piping assembly in a first state of the engine's diagnostic operating condition.

[0025] Figure 4 As shown Figure 1 A schematic diagram of an embodiment of the crankcase ventilation piping assembly in a second state of the engine's diagnostic operating condition.

[0026] Figure 5 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine diagnostic condition shown.

[0027] Figure 6 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine's diagnostic operating condition.

[0028] Figure 7 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in a second state of the engine's diagnostic operating condition.

[0029] Figure 8 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine diagnostic condition shown.

[0030] Figure 9 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine's diagnostic operating condition.

[0031] Figure 10 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine diagnostic condition shown.

[0032] Figure 11 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in a second state of the engine's diagnostic operating condition.

[0033] Figure 12 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine's diagnostic operating condition.

[0034] Figure 13 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine diagnostic condition shown.

[0035] Figure 14 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in a second state of the engine's diagnostic operating condition.

[0036] Figure 15 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine's diagnostic operating condition.

[0037] Figure 16 As shown Figure 4A schematic diagram of another embodiment of the crankcase ventilation piping assembly in the second state of the engine diagnostic condition shown.

[0038] Figure 17 The diagram shown is a flowchart of one embodiment of the leakage diagnosis method of this application.

[0039] Figure 18 The diagram shown is a structural block diagram of one embodiment of the processor of this application. Detailed Implementation

[0040] The crankcase ventilation piping assembly, engine, vehicle, and leak 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.

[0041] Figure 1 The diagram shown is a structural schematic of one embodiment of the engine 1 of this application. Figure 2 As shown Figure 1 The diagram shows a structural schematic of an embodiment of engine 1 in a non-diagnostic operating condition. Figure 3 As shown Figure 1 The diagram shows a structural schematic of an embodiment of the crankcase ventilation piping assembly 20 in the first state of the diagnostic operating condition of engine 1. Figure 4 As shown Figure 1 This is a schematic diagram of an embodiment of the crankcase ventilation piping assembly 20 in a second state of diagnostic conditions for engine 1. (In conjunction with...) Figures 1 to 4 As shown, 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 cylinder head cover 107 with a pressure regulating valve 108, a crankcase 109, and a crankcase ventilation piping 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, cylinder head cover 107, and pressure regulating valve 108 are located on top of the crankcase 109. The crankcase ventilation piping assembly 20 is partially integrated inside the cylinder head cover 107 and is connected to the pressure regulating valve 108 and the intake manifold 105.

[0042] exist Figures 1 to 4In the illustrated embodiment, the crankcase ventilation piping assembly 20 includes an internal ventilation piping 21, an external ventilation piping 22, and a switching valve 23. The internal ventilation piping 21 is located inside the cylinder head cover 107 of the engine 1 and connects to a pressure regulating valve 108 and an intake manifold 105. The internal ventilation piping 21 is integrated into the cylinder head cover 107, with its two ends connected to the pressure regulating valve 108 and the intake manifold 105, respectively. The external ventilation piping 22 includes a first ventilation piping 221, a second ventilation piping 222, and a bypass piping 223. The first ventilation piping 221 connects to the pressure regulating valve 108, the second ventilation piping 222 connects to the intake pipe 101, and the bypass piping 223 connects to the intake manifold 105. The switching valve 23 is connected to the first ventilation piping 221, the second ventilation piping 222, and the bypass piping 223, respectively. The switching valve 23 has a first position and a second position. When the switching valve 23 switches to different positions, it switches the connection status of the first ventilation duct 221, the second ventilation duct 222 and the bypass duct 223.

[0043] exist Figure 2 In the illustrated embodiment, engine 1 is in a non-diagnostic operating condition (normal operating condition). 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 in the turbocharger pipe 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. The air then enters the intake manifold 105 through the throttle valve 104, which distributes the air to different engine cylinders 106 of engine 1 for combustion. Inside engine 1, the pistons begin to move, compressing and expanding the gas. Simultaneously, gas from the crankcase 109 passes through gaps and other areas from inside engine 1, through the cylinder head cover 107, and then through the pressure regulating valve 108, which is connected to the crankcase ventilation pipe assembly 20. The pressure regulating valve 108 returns a portion of the gas to the intake manifold 101 through the external ventilation pipe 22 (e.g., Figure 2 (In the direction indicated by the solid arrow), the pressure regulating valve 108 returns another portion to the intake manifold 105 through the built-in ventilation duct 21 (as shown by the arrow). Figure 2 (Direction indicated by the dashed arrow). In this non-diagnostic condition, the switching valve 23 is in the first position, the first ventilation duct 221 is connected to the second ventilation duct 222, and the bypass duct 223 is disconnected from both the first ventilation duct 221 and the second ventilation duct 222.

[0044] exist Figure 3 and Figure 4In the illustrated embodiment, engine 1 is in diagnostic mode, throttle valve 104 is closed, and external ventilation pipe 22 is disconnected from intake pipe 101. At this time, the piston within engine 1 continuously moves within engine cylinder 106, creating a continuously suction-driven negative pressure system within intake manifold 105, engine cylinder 106, crankcase 109, and cylinder head cover 107. Under the negative pressure of this system, the diaphragm of pressure regulating valve 108 seals the connection between external ventilation pipe 22 and internal ventilation pipe 21, disconnecting pressure regulating valve 108 from both external ventilation pipe 22 and internal ventilation pipe 21.

[0045] Under this diagnostic condition, the crankcase ventilation piping assembly 20 is configured to a first state and a second state. The first state can be a state for detecting leaks in the bypass piping 223, and the second state can be a state for detecting leaks in the first ventilation piping 221 and the second ventilation piping 222.

[0046] exist Figure 3 In the illustrated embodiment, when the crankcase ventilation piping assembly 20 enters the first state of diagnostic operation, the switching valve 23 is in the first position, disconnecting the bypass piping 223 from both the first ventilation piping 221 and the second ventilation piping 222. At this time, the pressure regulating valve 108 is also disconnected from both the external ventilation piping 22 and the internal ventilation piping 21. In this state, by monitoring the engine 1 operating parameter signals or monitoring the negative pressure within the bypass piping 223, it can be determined whether the engine 1 operating parameter signals are abnormal or whether the negative pressure within the bypass piping 223 is within an abnormal range, thereby detecting the bypass piping 223 and diagnosing any leaks in the bypass piping 223.

[0047] When abnormal operating parameter signals of engine 1 are detected or the negative pressure in bypass pipe 223 is within an abnormal range, it indicates that there is a leak in bypass pipe 223, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormal operating parameter signals of engine 1 are detected or the negative pressure in external ventilation pipe 22 is within a normal range, it indicates that there is no leak in bypass pipe 223.

[0048] When the crankcase ventilation piping assembly 20 enters the first state of diagnostic conditions, and there are no abnormalities in the engine 1 operating parameter signals or the negative pressure in the external ventilation piping 22 (first ventilation piping 221, second ventilation piping 222 and bypass piping 223) is within the normal range, indicating that there is no leakage in the bypass piping 223, the throttle valve 104104 remains closed, causing the crankcase ventilation piping assembly 20 to enter the second state of diagnostic conditions.

[0049] exist Figure 4In the illustrated embodiment, when the crankcase ventilation piping assembly 20 enters the second state of diagnostic operation, the switching valve 23 switches to the second position, connecting the first ventilation piping 221, the second ventilation piping 222, and the bypass piping 223, creating a large negative pressure inside. At this time, the engine 1 operating parameter signal is monitored, or the negative pressure within the external ventilation piping 22 (first ventilation piping 221, second ventilation piping 222, and bypass piping 223) is monitored to determine if the engine 1 operating parameter signal is abnormal, or if the negative pressure within the external ventilation piping 22 (first ventilation piping 221, second ventilation piping 222, and bypass piping 223) is within an abnormal range, thus detecting leakage in any one of the first ventilation piping 221, second ventilation piping 222, and bypass piping 223. Because in Figure 3 In the illustrated embodiment, no leakage was detected in the bypass line 223; therefore, in Figure 4 In the illustrated embodiment, the first ventilation duct 221 and the second ventilation duct 222 are mainly inspected to diagnose any leakage in either the first ventilation duct 221 or the second ventilation duct 222.

[0050] When an abnormality is detected in the engine 1 operating parameter signal or the negative pressure in the monitored external ventilation pipes 22 (first ventilation pipe 221, second ventilation pipe 222, and bypass pipe 223) is within an abnormal range, it indicates a leak in either the first ventilation pipe 221 or the second ventilation pipe 222, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormality is detected in the engine 1 operating parameter signal or the negative pressure in the monitored external ventilation pipes 22 (first ventilation pipe 221, second ventilation pipe 222, and bypass pipe 223) is within a normal range, it indicates that neither the first ventilation pipe 221 nor the second ventilation pipe 222 is leaking. When there is no leak, the diagnosis ends, the switching valve 23 is switched back to the first position, and then the above process is repeated cyclically.

[0051] When the crankcase ventilation piping assembly 20 is in non-diagnostic condition, the throttle valve 104 is normally open, and the external ventilation piping 22 is connected to the intake piping 101. At this time, the pressure regulating valve 108 is fully open, and the flow is unobstructed. When the crankcase ventilation piping assembly 20 is in diagnostic condition, the throttle valve 104 is closed, and the external ventilation piping 22 is disconnected from the intake piping 101. At this time, the piston in the engine 1 continues to move in the engine cylinder 106, causing a large negative pressure to be generated in the intake manifold 105. Under the action of the negative pressure, the diaphragm of the pressure regulating valve 108 will block the connection between the external ventilation piping 22 and the internal ventilation piping 21. In this case, the switching valve 23 is switched between the first and second positions to perform phased diagnosis of the bypass piping 223, the first ventilation piping 221, and the second ventilation piping 222.

[0052] The crankcase ventilation duct assembly 20 of this application embodiment achieves the coordination between the bypass duct 223 and the external ventilation duct 22 through the switching valve 23. It can detect complex ventilation duct systems in stages and areas, effectively solve the problem of not being able to accurately locate the leaking branch, and improve the accuracy and reliability of diagnosis.

[0053] exist Figures 1 to 4 In the illustrated embodiment, the switching valve 23 includes at least a first connection port 231, a second connection port 232, and a third connection port 233. A first ventilation duct 221 is connected between the pressure regulating valve 108 and the first connection port 231. A second ventilation duct 222 is connected between the second connection port 232 and the intake duct 101. The third connection port 233 is connected to the intake manifold 105 via a bypass duct 223.

[0054] exist Figure 3 In the illustrated embodiment, when the crankcase ventilation piping assembly 20 is in diagnostic mode, the throttle valve 104 is closed, and the external ventilation piping 22 is disconnected from the intake piping 101. At this time, the piston in the engine 1 continues to move within the engine cylinder 106, creating a negative pressure system in the intake manifold 105, pressure regulating valve 108, and crankcase ventilation piping assembly 20. When the switching valve 23 is selectively switched to the first position, the third connection port 233 is disconnected from the first connection port 231 and the second connection port 232, thus disconnecting the bypass piping 223 from the first ventilation piping 221 and the second ventilation piping 222. In this case, by monitoring the engine 1 operating parameter signals or monitoring the negative pressure in the bypass piping 223, it can be determined whether the engine 1 operating parameter signals are abnormal or whether the negative pressure in the bypass piping 223 is within an abnormal range, thereby detecting any leakage in the bypass piping 223.

[0055] exist Figure 4In the illustrated embodiment, when the crankcase ventilation piping assembly 20 enters the first state of diagnostic conditions, and the engine 1 operating parameter signals are normal or the negative pressure in the external ventilation piping 22 (first ventilation piping 221, second ventilation piping 222, and bypass piping 223) is within the normal range, indicating that there is no leakage in the bypass piping 223, the throttle valve 104104 remains closed, causing the crankcase ventilation piping assembly 20 to enter the second state of diagnostic conditions. When the switching valve 23 is selectively switched to the second position, the third connection port 233 is connected to both the first connection port 231 and the second connection port 232, thus connecting the first ventilation piping 221, the second ventilation piping 222, and the bypass piping 223 to each other. In this situation, the engine 1 operating parameter signal can be monitored, or the negative pressure in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) can be monitored to determine whether the engine 1 operating parameter signal is abnormal or whether the negative pressure in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) is within an abnormal range, thereby detecting any leakage in the first ventilation duct 221, second ventilation duct 222, and bypass duct 223. Because in Figure 3 In the illustrated embodiment, no leakage was detected in the bypass pipe 223. Therefore, this embodiment mainly detects the leakage of the first ventilation pipe 221 and the second ventilation pipe 222.

[0056] This configuration, achieved by switching between the first connecting port 231, the second connecting port 232, and the third connecting port 233 via the switching valve 23, facilitates switching between the first ventilation duct 221, the second ventilation duct 222, and the bypass duct 223. This is beneficial for detecting leaks in various ventilation ducts and connections of the external ventilation system. By utilizing the three-way switching valve 23, two logically independent pathways are established, simplifying the mechanical complexity of duct switching. This enables a highly efficient integrated solution that uses a single valve to control multiple stages of diagnostics. Furthermore, the switching method is simple, highly sensitive, stable, reliable, and cost-effective.

[0057] In some embodiments, the crankcase ventilation piping assembly 20 further includes a pressure sensor 24, which is disposed at one of the following: bypass pipe 223, built-in ventilation pipe 21, first ventilation pipe 221, second ventilation pipe 222, intake manifold 105, the connection between the crankcase ventilation piping assembly 20 and the pressure regulating valve 108, the connection of the switching valve 23, the connection between the bypass pipe 223 and the intake manifold 105, and the connection between the bypass pipe 223 and the pressure regulating valve 108. This arrangement provides multiple flexible placement options for the pressure sensor 24, allowing for the selection of an optimal sensing point based on the available space in different engine compartments. This ensures that pressure fluctuations within the piping can be acquired in real-time and accurately under any layout, providing high-precision data support for leak detection.

[0058] In some embodiments, the crankcase ventilation piping assembly 20 includes a first pilot valve 25, which is disposed in one of the following locations: the bypass pipe 223, the connection port between the switching valve 23 and the bypass pipe 223, and the connection between the bypass pipe 223 and the intake manifold 105. This configuration, by providing the first pilot valve 25 at the interface or pipe, allows for precise control of the single flow direction of the diagnostic airflow, preventing gas interference in non-diagnostic areas, thereby enabling faster and more stable establishment of a vacuum environment.

[0059] In some embodiments, the first pilot valve 25 is integrated with the pressure sensor 24 and is integrated into the connection port between the switching valve 23 and the bypass line 223. The first pilot valve 25 is configured such that when the intake manifold 105 is under positive pressure and in a non-diagnostic operating condition, the first pilot valve 25 is in a closed state to cut off fluid flow to the pressure sensor 24. This configuration integrates the first pilot valve 25 with the pressure sensor 24, and utilizes the one-way shut-off characteristic of the first pilot valve 25 to actively shield the pressure sensor 24 under the high-load positive pressure conditions of normal engine operation. This avoids prolonged exposure of the pressure sensor 24 to high-pressure impacts containing oil vapor, extending the service life of the pressure sensor 24 and reducing maintenance costs.

[0060] In some embodiments, the pressure sensor 24 is positioned relative to the first pilot valve 25 on the side closer to the switching valve 23. In other embodiments, the first pilot valve 25 is positioned relative to the pressure sensor 24 on the side closer to the switching valve 23. This configuration, by defining the relative position of the pressure sensor 24 and the first pilot valve 25, ensures good pressure sensing sensitivity under diagnostic conditions, while providing better shut-off protection under non-diagnostic conditions.

[0061] In some embodiments, the crankcase ventilation piping assembly 20 includes a second pilot valve 26 disposed at the connection between the second ventilation piping 222 and the intake piping 101. This arrangement, with the second pilot valve 26 at the connection between the second ventilation piping 222 and the intake piping 101, effectively prevents external air from flowing back into the system during diagnostics, ensuring the sealing of the diagnostic circuit.

[0062] In some embodiments, the crankcase ventilation duct assembly 20 includes a third pilot valve 27, located at one of the following locations: the connection between the built-in ventilation duct 21, the connection between the intake manifold 105 and the built-in ventilation duct 21, and the connection between the built-in ventilation duct 21 and the pressure regulating valve 108. This configuration, through the third pilot valve 27, controls the flow direction of the built-in duct, ensuring that diagnostic pressure is accurately transmitted to the cylinder head cover 107, thereby achieving effective monitoring of the integrated flow channel sealing.

[0063] In this embodiment, the first pilot valve 25, the second pilot valve 26, and the third pilot valve 27 are all one-way valves. By using one-way valves as guiding elements, and utilizing their unidirectional conduction characteristics, flow direction control can be achieved without additional electronic control drive, reducing system power consumption and potential failure points.

[0064] Looking back Figures 1 to 4 In the illustrated embodiment, the pressure sensor 24 and the first pilot valve 25 are both integrated into the third communication port 233 of the switching valve 23, with the first pilot valve 25 positioned close to the switching valve 23 relative to the pressure sensor 24. The second pilot valve 26 is located at the connection between the second ventilation duct 222 and the intake duct 101. The third pilot valve 27 is located in the built-in ventilation duct 21. This embodiment integrates the pressure sensor 24 and the first pilot valve 25 into the interface of the switching valve 23, and utilizes the one-way shut-off characteristic of the first pilot valve 25 to effectively isolate positive pressure oil and gas to protect the sensing element under non-diagnostic conditions. Simultaneously, the second pilot valve 26, located at the connection between the second ventilation duct 222 and the intake duct 101, and the third pilot valve 27, located in the built-in ventilation duct 21, achieve tight isolation of each monitoring branch during the step-by-step diagnostic process. This not only ensures the rapid establishment of a diagnostic vacuum environment but also supports a local-to-overall judgment logic, thereby enabling precise location of leaks in complex piping systems.

[0065] exist Figure 2In the illustrated embodiment, under normal operating conditions, fresh air enters the intake manifold, the throttle valve 104 opens and enters the intake manifold 105, and another path of air enters the bypass pipe 223. The switching valve 23 is equipped with a one-way valve. When the intake manifold 105 is under positive pressure, the positive pressure air is blocked by the one-way valve. The intake manifold 105 then enters the engine cylinder 106 body and crankcase. Inside the crankcase 109, the air flows into the engine cylinder head. The engine cylinder 106 head typically has a pressure regulating valve 108. After the pressure is regulated by the pressure regulating valve 108, the air flows into the first ventilation pipe 221 (high-load pipe) of the external ventilation pipe 22. From the first ventilation pipe 221, it passes through the switching valve 23 and then enters the second ventilation pipe 222 of the external ventilation pipe 22. The second ventilation pipe 222 has a one-way valve at its end, which connects to the intake manifold 101. Another path of the pressure regulating valve 108 enters the intake manifold 105 from inside the cylinder head cover 107 through the built-in ventilation pipe 21 (low load pipe).

[0066] exist Figure 3 In the embodiment shown, in the first state of the diagnostic condition, the switching valve 23 is in the first position and the throttle valve 104 is closed. At this time, a negative pressure is generated in the intake manifold 105. The switching valve 23 is not open and the pressure regulating valve 108 is sucked in. In this state, a large negative pressure is generated inside the intake manifold 105, the bypass pipe 223 and the built-in ventilation pipe 21. Under this condition, it is possible to diagnose whether the bypass pipe 223 is normal.

[0067] exist Figure 4 In the illustrated embodiment, in the second state of the diagnostic condition, the switching valve 23 is in the second position, the throttle valve 104 is closed, and a negative pressure is generated in the intake manifold 105. At this time, the pressure regulating valve 108 is sucked in. In this state, the first ventilation pipe 221 and the second ventilation pipe 222 are connected to the bypass pipe 223 through the switching valve 23. At this time, a large negative pressure is generated inside the first ventilation pipe 221, the second ventilation pipe 222 and the bypass pipe 223, and the built-in ventilation pipe 21 also generates a negative pressure. Under this condition, it is possible to diagnose whether the first ventilation pipe 221 and the second ventilation pipe 222 are normal.

[0068] By switching valve 23, the bypass pipe 223 and the external ventilation pipe 22 are switched, realizing a phased and regional detection scheme for complex ventilation pipes. This effectively solves the problem of not being able to accurately locate the leaking branch and improves the accuracy and reliability of diagnosis.

[0069] Figure 5 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 5 The illustrated embodiments and Figure 4The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 5 In the illustrated embodiment, the pressure sensor 24 is located at either the first connection port 231 or the second connection port 232 of the switching valve 23. By placing the pressure sensor 24 at either the first connection port 231 or the second connection port 232 of the switching valve 23, this embodiment can more directly and accurately sense changes in pressure signals within the first ventilation duct 221 or the second ventilation duct 222 when the switching valve 23 is in the second position during diagnostic operation, thereby improving the sensitivity and accuracy of diagnosing leaks in the external ventilation duct.

[0070] Figure 6 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 6 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 6 In the illustrated embodiment, both the pressure sensor 24 and the first pilot valve 25 are integrated within the third communication port 233 of the switching valve 23, with the pressure sensor 24 positioned relative to the first pilot valve 25 and close to the switching valve 23. This embodiment places the pressure sensor 24 inside the first pilot valve 25 (closer to the switching valve 23). Utilizing the physical barrier formed by the first pilot valve 25 when positive pressure appears in the intake manifold 105, the pressure sensor 24 is protected from the impact and contamination of high-pressure oil and gas from the intake manifold 105 under non-diagnostic conditions, effectively improving the service life and detection stability of the pressure sensor 24.

[0071] Figure 7 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in a second state of the diagnostic condition of engine 1 shown. Figure 7 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 7 In the illustrated embodiment, the pressure sensor 24 is located in the bypass pipe 223, and the first pilot valve 25 is located at the connection between the bypass pipe 223 and the third connection port 233 of the switching valve 23, positioned close to the switching valve 23 relative to the pressure sensor 24. This embodiment utilizes the one-way shut-off function of the first pilot valve 25, by placing the first pilot valve 25 between the switching valve 23 interface and the pressure sensor 24, to prevent the backflow of high-pressure oil and gas from the intake manifold 105 into the bypass pipe 223 under non-diagnostic conditions, thereby providing effective physical shielding and lifespan protection for the pressure sensor 24 located in the pipe.

[0072] Figure 8 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 8 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 8 In the illustrated embodiment, pressure sensor 24 is located at the connection between bypass line 223 and intake manifold 105, and first pilot valve 25 is located at the connection between bypass line 223 and third connection port 233 of switching valve 23. This embodiment places pressure sensor 24 near the end of intake manifold 105, enabling direct and real-time acquisition of pressure signals from the manifold side. Simultaneously, in conjunction with the first pilot valve located at the switching valve 23 end, it ensures stable pressure sensing throughout the bypass line 223 during step-by-step diagnostics and achieves effective physical isolation and protection of the upstream switching valve 23 assembly.

[0073] Figure 9 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 9 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 9 In the illustrated embodiment, the pressure sensor 24 is located in the built-in ventilation duct 21, and is positioned relative to the third pilot valve 27, closer to the intake manifold 105. This embodiment places the pressure sensor 24 in the built-in ventilation duct 21, close to the intake manifold 105, enabling direct monitoring of the diagnostic power source provided by the intake manifold 105 and its actual pressure state within the built-in flow channel. With the cooperation of the third pilot valve 27, this ensures high-precision monitoring of the sealing performance of the integrated flow channel inside the cylinder head cover 107.

[0074] Figure 10 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 10 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 10 In the illustrated embodiment, the pressure sensor 24 is located in the built-in ventilation duct 21, and is positioned relative to the third guide valve 27, closer to the pressure regulating valve 108. This embodiment places the pressure sensor 24 in the built-in ventilation duct 21, close to the pressure regulating valve 108, allowing for direct sensing of the end-sealing state of the pressure regulating valve 108 after it is closed during diagnostic operations. This enables precise determination of whether there is any minute leakage in the valve body and flow channel integrated inside the cylinder head cover 107.

[0075] Figure 11 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in a second state of the diagnostic condition of engine 1 shown. Figure 11 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 11 In the illustrated embodiment, the pressure sensor 24 is located in the second ventilation duct 222. This embodiment places the pressure sensor 24 on the second ventilation duct 222 connected to the intake duct 101, enabling direct sensing of the pressure response of this external duct during vacuum extraction after the diagnostic circuit is connected. This improves the sensitivity of identifying leaks in the external ventilation branch on the intake duct 101 side.

[0076] Figure 12 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 12 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 12 In the illustrated embodiment, pressure sensor 24 is located in the first ventilation duct 221. This embodiment places pressure sensor 24 on the first ventilation duct 221 connected to pressure regulating valve 108, enabling monitoring of the sealing pressure and its fluctuations at the outlet of pressure regulating valve 108. This improves the targeting and sensitivity of leak detection in the external ventilation duct 221 connecting cylinder head cover 107 and switching valve 23.

[0077] Figure 13 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 13 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 13 In the illustrated embodiment, pressure sensor 24 is located in the intake manifold 105. This embodiment utilizes the existing or newly added pressure sensor 24 within the engine 1 intake manifold 105 for sensing, enabling real-time acquisition of raw signals from the power source for diagnosis and monitoring of the impact of leaks throughout the entire path.

[0078] Figure 14 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in a second state of the diagnostic condition of engine 1 shown. Figure 14 The illustrated embodiments and Figure 4The embodiments shown are similar, the main difference being the different placement of the pressure sensor 24. Figure 14 In the illustrated embodiment, the pressure sensor 24 is located at the connection between the first ventilation duct 221 and the pressure regulating valve 108. By arranging the pressure sensor 24 at the connection between the first ventilation duct 221 and the pressure regulating valve 108, this embodiment can monitor the sealing performance at the interface of the pressure regulating valve 108 and the pressure maintenance status after the valve body is closed, effectively determining whether there is a risk of leakage at the connection between the first ventilation duct 221 and the cylinder head cover 107.

[0079] Figure 15 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 15 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different positions of the first guide valve 25. Figure 15 In the illustrated embodiment, the first pilot valve 25 is located in the bypass pipe 223, and the pressure sensor 24 is located in the third connection port 233 of the switching valve 23. In this embodiment, the pressure sensor 24 is integrated into the interface of the switching valve 23. The first pilot valve 25 located in the bypass pipe 223 serves as a front barrier, ensuring a compact and protected environment for the sensor while effectively blocking the backflow impact from the intake manifold 105 end, thus improving the sensor's sensing stability under complex vibration conditions.

[0080] Figure 16 As shown Figure 4 A schematic diagram of another embodiment of the crankcase ventilation piping assembly 20 in the second state of the diagnostic condition of engine 1 shown. Figure 16 The illustrated embodiments and Figure 4 The embodiments shown are similar, the main difference being the different positions of the first guide valve 25. Figure 16 In the illustrated embodiment, the first pilot valve 25 is located at the connection between the bypass line 223 and the intake manifold 105. By placing the first pilot valve 25 at the inlet end of the intake manifold 105, this embodiment achieves the cutoff of reverse high-pressure oil and gas near the pressure source, providing maximum backflow protection and contamination shielding for the entire bypass line 223 and the upstream switching valve 23 assembly.

[0081] This application also provides a vehicle, including as described above. Figures 1 to 16The embodiment shows engine 1. In this embodiment, a high-performance diagnostic piping assembly is integrated into the engine 1 body. Through the physical coupling of the piping with the inherent components of engine 1, a crankcase ventilation and monitoring system is established, which can improve the intelligence and compliance of the whole engine emission system, enable the vehicle to have the diagnostic capability to meet stringent emission regulations, and monitor the leakage risk of the crankcase ventilation system in real time, ensuring the safety and environmental protection of vehicle operation.

[0082] Figure 17 The diagram shown is a flowchart of one embodiment of the leakage diagnosis method of this application. Figure 17 As shown, the leak diagnosis method is applied to the above-mentioned Figures 1 to 16 Engine 1 as shown in the embodiment. In Figure 17 In the illustrated embodiment, the leak diagnosis method includes steps S1 to S3. Wherein, Step S1: In response to engine 1 entering diagnostic mode, control switching valve 23 to the first position to obtain detection signals. When engine 1 enters the first state of diagnostic mode, switching valve 23 is switched to the first position. At this time, bypass pipe 223 is disconnected from the first ventilation pipe 221 and the second ventilation pipe 222.

[0083] Step S2: Determine whether there is a leak in the bypass line 223 based on the detection signal. In this step, the presence of a leak in the bypass line 223 is determined based on the detection signal. In this case, the engine 1 operating parameter signal or the negative pressure in the bypass line 223 can be monitored to determine whether the engine 1 operating parameter signal is abnormal or whether the negative pressure in the bypass line 223 is within an abnormal range, thereby detecting the leak in the bypass line 223.

[0084] When abnormal operating parameter signals of engine 1 are detected or the negative pressure in bypass pipe 223 is within an abnormal range, it indicates that there is a leak in bypass pipe 223, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormal operating parameter signals of engine 1 are detected or the negative pressure in external ventilation pipe 22 is within a normal range, it indicates that there is no leak in bypass pipe 223.

[0085] Step S3: When it is determined that there is no leakage in the bypass pipe 223, the crankcase ventilation pipe assembly 20 enters the second state of diagnostic operation. The control switching valve 23 is then switched to the second position. At this time, the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223 are interconnected, and a large negative pressure is generated internally. The detection signal is acquired again, and it is determined whether at least one of the first ventilation pipe 221 and the second ventilation pipe 222 of the external ventilation pipe 22 has a leak. The detection signal includes at least one of a pressure signal and an engine 1 operating parameter signal. In this step, after acquiring the detection signal again, it is further determined whether there is a leak in the first ventilation pipe 221 and the second ventilation pipe 222. In this situation, the engine 1 operating parameter signal can be monitored, or the negative pressure in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) can be monitored to determine whether the engine 1 operating parameter signal is abnormal or whether the negative pressure in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) is within an abnormal range, thereby detecting any leakage in the first ventilation duct 221, second ventilation duct 222, and bypass duct 223. Because in Figure 3 In the illustrated embodiment, no leakage was detected in the bypass line 223; therefore, in Figure 4 In the illustrated embodiment, the first ventilation duct 221 and the second ventilation duct 222 are mainly inspected to diagnose any leakage in either the first ventilation duct 221 or the second ventilation duct 222.

[0086] The leakage diagnosis method of this application, through a progressive diagnostic logic from local to overall, can not only detect the integrity of the entire system, but also, through the exclusionary determination in the first stage, accurately pinpoint whether the leakage source is located in the main ventilation duct or a branch in the second stage, improving the efficiency of fault diagnosis. Furthermore, by setting a step-by-step logic of independently detecting the bypass duct 223 at the first position and connectedly detecting the external ventilation duct 22 at the second position, a peel-off diagnosis of the branches of the complex ventilation system is achieved. This progressive judgment process can not only determine whether a leak exists in the system, but also accurately determine whether the leak occurs in the bypass branch or the high-load main branch, improving the accuracy of fault location and maintenance efficiency.

[0087] In some embodiments, step S1, where the engine 1 enters the diagnostic condition, includes: when the engine 1 is idling, using the negative pressure generated in the intake manifold 105, switching the pressure regulating valve 108 to the closed state to seal the air passage on the cylinder head cover 107 side. By cleverly utilizing the natural vacuum source under idling conditions, and using the natural negative pressure of the engine 1 at idle as a power source, the pressure regulating valve 108 is automatically closed to cut off pressure interference at the crankcase 109 end. This eliminates the need for additional energy-consuming equipment such as a vacuum pump, thus establishing a diagnostic environment. This simplifies the system structure, reduces system costs, and improves energy efficiency.

[0088] In some embodiments, the detection signal includes a pressure signal. The pressure signal can be detected via... Figures 1 to 16 The pressure sensor 24 shown in the embodiment is used for detection.

[0089] In some embodiments, determining whether at least one of the bypass duct 223, the first ventilation duct 221, and the second ventilation duct 222 is leaking includes: With the switching valve 23 in the first position, the bypass pipe 223 is disconnected from both the first ventilation pipe 221 and the second ventilation pipe 222. If the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, a leak is detected in the bypass pipe 223. At this time, the negative pressure within the bypass pipe 223 is monitored to determine if it is within an abnormal range, thus detecting any leaks in the bypass pipe 223. If the monitored negative pressure within the bypass pipe 223 is within an abnormal range, it indicates a leak, and a leak alarm will be issued, at which point the diagnosis ends. If the monitored engine 1 operating parameter signal is normal or the monitored negative pressure within the external ventilation pipe 22 is within the normal range, it indicates that the bypass pipe 223 is not leaking.

[0090] Assuming there is no leakage in the bypass pipe 223, the leakage of the first ventilation pipe 221 and the second ventilation pipe 222 is detected. When the switching valve 23 is switched to the second position, the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223 are interconnected. If the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, it is determined that at least one of the first ventilation pipe 221 and the second ventilation pipe 222 has a leak. At this time, the negative pressure in the external ventilation pipe 22 (the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223) is monitored to determine whether the negative pressure in the external ventilation pipe 22 (the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223) is within the abnormal range, in order to detect the leakage of any one of the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223. Since this step is performed after confirming that there is no leakage in the bypass pipe 223, this step mainly detects the leakage of the first ventilation pipe 221 and the second ventilation pipe 222.

[0091] When the negative pressure detected in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) is within the abnormal range, it indicates that either the first ventilation duct 221 or the second ventilation duct 222 has a leak, and a leak alarm will be issued, at which point the diagnosis ends. When the negative pressure detected in the external ventilation duct 22 (first ventilation duct 221, second ventilation duct 222, and bypass duct 223) is within the normal range, it indicates that neither the first ventilation duct 221 nor the second ventilation duct 222 has a leak.

[0092] This setup deeply integrates step-by-step diagnostic logic with pressure sensing technology. By comparing the pressure values ​​with a preset threshold at two different switching positions of the switching valve 23, the amount of leakage can be quantitatively determined. This method reflects the airtightness of the pipeline and is extremely sensitive to detecting minute leaks, ensuring the objectivity and accuracy of the diagnostic results.

[0093] In some other embodiments, the detection signal includes engine 1 operating parameter signals. Engine 1 operating parameter signals may be abnormal deviations in operating data such as fuel correction coefficient, intake air volume deviation, idle speed control duty cycle, or instantaneous speed fluctuations. Without the need for an additional pressure sensor 24, the logical determination of the ventilation duct leakage status is achieved through software algorithms.

[0094] In other embodiments, determining whether at least one of the bypass duct 223, the first ventilation duct 221, and the second ventilation duct 222 is leaking includes: With the switching valve 23 in the first position, the bypass pipe 223 is disconnected from both the first ventilation pipe 221 and the second ventilation pipe 222. If a preset deviation is detected in the engine 1 operating parameter signal relative to a preset reference value, a leak is identified in the bypass pipe 223. At this time, by monitoring the engine 1 operating parameter signal, it is determined whether the engine 1 operating parameter signal is abnormal, thus detecting the leak in the bypass pipe 223. When an abnormality is detected in the engine 1 operating parameter signal, it indicates a leak in the bypass pipe 223, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormality is detected in the engine 1 operating parameter signal, it indicates that there is no leak in the bypass pipe 223.

[0095] Assuming there is no leakage in the bypass pipe 223, the leakage of the first ventilation pipe 221 and the second ventilation pipe 222 is checked. When the switching valve 23 is switched to the second position, the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223 are interconnected. If a preset deviation is detected in the engine 1 operating parameter signal relative to a preset reference value, it is determined that at least one of the first ventilation pipe 221 and the second ventilation pipe 222 is leaking. At this time, the engine 1 operating parameter signal is monitored to determine whether there is any abnormality in the engine 1 operating parameter signal, in order to detect the leakage of any one of the first ventilation pipe 221, the second ventilation pipe 222, and the bypass pipe 223. Since this step is performed after confirming that there is no leakage in the bypass pipe 223, this step mainly checks for leakage in the first ventilation pipe 221 and the second ventilation pipe 222.

[0096] When an abnormality is detected in the engine 1 operating parameter signal, it indicates a leak in either the first ventilation pipe 221 or the second ventilation pipe 222, and a leak alarm will be issued, at which point the diagnosis ends. When no abnormality is detected in the engine 1 operating parameter signal, it indicates that there is no leak in either the first ventilation pipe 221 or the second ventilation pipe 222.

[0097] This setup, by monitoring changes in engine 1 operating parameters (such as fuel trim and intake deviation) to assist in leak detection, provides the system with a software-based diagnostic path that is not hardware-dependent. This not only provides reliable redundancy protection when pressure sensor 24 is limited or fails, but also allows the system to identify the impact of leaks on powertrain operating conditions through algorithms, thus broadening the monitoring coverage and enhancing the ability to prevent and mitigate leaks.

[0098] This application also provides an electronic device including a memory and a processor. The memory is used to store a computer program. The processor is used to implement the leakage diagnosis and control method as described in any of the above embodiments when executing the computer program. This embodiment embeds advanced diagnostic algorithms into the electronic device, realizing the automation and real-time nature of the diagnostic process, and providing long-term software-level protection for vehicles.

[0099] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the leakage diagnosis method as described in any of the above embodiments. This embodiment provides a platform for system upgrades and algorithm optimization, ensuring that the diagnostic strategy can be dynamically adjusted according to the wear condition of engine 1 or changes in the environment, maintaining diagnostic accuracy throughout the entire lifecycle.

[0100] Figure 18 The diagram shown is a structural block diagram of one embodiment of the electronic device of this application. Figure 18 As shown, the processor includes one or more processors 31 for implementing, as Figure 17 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 17 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.

[0101] 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.

[0102] 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 crankcase ventilation duct assembly, characterized in that, Applied to an engine, the engine is equipped with an intake manifold, an intake pipeline, and a pressure regulating valve; the crankcase ventilation pipeline assembly includes: An internal ventilation duct is located inside the cylinder head cover of the engine and connects the pressure regulating valve to the intake manifold. External ventilation ducts include a first ventilation duct, a second ventilation duct, and a bypass duct; The switching valve is connected to the first ventilation duct, the second ventilation duct, and the bypass duct, respectively. Under diagnostic conditions, the crankcase ventilation piping assembly is configured in a first state and a second state; When in the first state, the switching valve is in the first position, which disconnects the bypass pipeline from the first ventilation pipeline and the second ventilation pipeline, so as to detect the bypass pipeline; When in the second state, the switching valve switches to the second position, connecting the first ventilation duct, the second ventilation duct, and the bypass duct to each other, so as to detect the first ventilation duct and the second ventilation duct.

2. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation piping assembly further includes a pressure sensor, which is located at one of the bypass piping, the built-in ventilation piping, the first ventilation piping, the second ventilation piping, the intake manifold, the connection between the crankcase ventilation piping assembly and the pressure regulating valve, the connection of the switching valve's port, the connection between the bypass piping and the intake manifold, and the connection between the bypass piping and the pressure regulating valve.

3. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation piping assembly includes a first pilot valve, which is located in one of the bypass piping, the connection port between the switching valve and the bypass piping, and the connection point between the bypass piping and the intake manifold.

4. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation piping assembly includes a first pilot valve and a pressure sensor; the first pilot valve and the pressure sensor are integrated and integrated within the connection port between the switching valve and the bypass piping; wherein, the first pilot valve is configured to be in a closed state when the intake manifold is under positive pressure and in a non-diagnostic operating condition, so as to cut off the fluid flow to the pressure sensor.

5. The crankcase ventilation duct assembly according to claim 4, characterized in that, The pressure sensor is positioned relative to the first pilot valve on the side closer to the switching valve; or The first pilot valve is positioned on the side of the pressure sensor closer to the switching valve.

6. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation duct assembly includes a second guide valve located at the connection between the second ventilation duct and the intake duct.

7. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation duct assembly includes a third guide valve, which is located at one of the built-in ventilation duct, the connection between the intake manifold and the built-in ventilation duct, and the connection between the built-in ventilation duct and the pressure regulating valve.

8. The crankcase ventilation duct assembly according to claim 1, characterized in that, The switching valve includes at least a first connection port, a second connection port, and a third connection port; the first ventilation duct is connected between the pressure regulating valve and the first connection port; the second ventilation duct is connected between the second connection port and the intake duct; the third connection port is connected to the intake manifold through the bypass duct. When the switching valve is selectively switched to the first position, the third connection port is disconnected from the first connection port and the second connection port, thereby disconnecting the bypass pipe from the first ventilation pipe and the second ventilation pipe; when the switching valve is selectively switched to the second position, the third connection port is connected to both the first connection port and the second connection port, thereby connecting the first ventilation pipe, the second ventilation pipe and the bypass pipe to each other.

9. The crankcase ventilation duct assembly according to claim 1, characterized in that, The crankcase ventilation piping assembly includes a first pilot valve, a second pilot valve, and a third pilot valve, all of which are one-way valves.

10. An engine, characterized in that, include: Intake piping, intake manifold, cylinder head cover with pressure regulating valve; and The crankcase ventilation piping assembly as described in any one of claims 1 to 9; wherein the built-in ventilation piping of the crankcase ventilation piping assembly is disposed inside the cylinder head cover, and both ends are respectively connected to the pressure regulating valve and the intake manifold; the first ventilation piping of the crankcase ventilation piping assembly is connected to the pressure regulating valve, the second ventilation piping of the crankcase ventilation piping assembly is connected to the intake pipe, and the bypass piping of the crankcase ventilation piping assembly is connected to the intake manifold.

11. A vehicle, characterized in that, Including the engine as described in claim 10.

12. A leak diagnosis method, applied to the engine as described in claim 10, characterized in that, The leakage diagnosis method includes: In response to the engine entering diagnostic mode, the control switching valve is placed in the first position to obtain a detection signal; Based on the detection signal, determine whether there is a leak in the bypass pipeline; When it is determined that there is no leakage in the bypass pipeline, the switching valve is controlled to switch to the second position, the detection signal is acquired again, and it is determined whether there is a leak in at least one of the first ventilation pipeline and the second ventilation pipeline of the external ventilation pipeline; The detection signal includes at least one of a pressure signal and an engine operating parameter signal.

13. The leakage diagnosis method according to claim 12, characterized in that, The engine entering diagnostic mode includes: When the engine is idling, the negative pressure generated in the intake manifold causes the pressure regulating valve to switch to the closed state, thereby sealing the air passage on the cylinder head cover side.

14. The leakage diagnosis method according to claim 12, characterized in that, The detection signal includes a pressure signal; Determining whether at least one of the bypass duct, the first ventilation duct, and the second ventilation duct is leaking includes: When the switching valve is in the first position, if the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, it is determined that there is a leak in the bypass pipeline. When the switching valve is switched to the second position, if the pressure value represented by the acquired pressure signal does not meet the preset pressure threshold, it is determined that at least one of the first ventilation duct and the second ventilation duct has a leak.

15. The leakage diagnosis method according to claim 12, characterized in that, The detection signals include engine operating parameter signals; Determining whether at least one of the bypass duct, the first ventilation duct, and the second ventilation duct is leaking includes: When the switching valve is in the first position, if a preset deviation is detected in the engine operating parameter signal relative to a preset reference value, it is determined that there is a leak in the bypass pipeline; When the switching valve is switched to the second position, if a preset deviation is detected in the engine operating parameter signal relative to a preset reference value, it is determined that at least one of the first ventilation pipe and the second ventilation pipe is leaking.

16. 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 12 to 15 when executing the computer program.

17. 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 12 to 15.

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