Connection state monitoring device, ventilation pipe and connection state monitoring method

Abstract

The invention provides a connection state monitoring device comprising a monitoring assembly which comprises a monitoring wire, a first electric connector and a second electric connector, and the monitoring assembly is configured to be fixed on a connecting piece or be integrated with the connecting piece; and a control unit connected with the first and second terminals of the monitoring assembly to apply a source voltage; wherein the monitoring wires comprise a first group of wires and a second group of wires, each group of wires comprises at least two wires which are connected in parallel, and the first group of wires and the second group of wires are configured to be connected in series with a first connector on a first device through a first electric connector; the second group of wires are configured to be connected to the second terminal through the second electric connector and a second connector on a second device, and the first group of wires are connected to the first terminal; and the first terminal is connected with a grounding terminal of the control unit, and the second terminal is connected with a voltage source of the control unit. The invention further provides a ventilation pipe and a connection state monitoring method. According to the invention, the connection state can be detected more accurately and a self-detection function can be realized.

Description

Technical Field

[0001] The present application relates to the field of monitoring technology, and in particular to a connection status monitoring device and a monitoring method applicable to, for example, a ventilation pipe of an internal combustion engine crankcase. Background Art

[0002] There is lubricating oil in the crankcase of the internal combustion engine, and its function is to ensure that the crankshaft is sufficiently lubricated during rotation. During the operation of the internal combustion engine, the temperature of the crankcase is high, and the lubricating oil is prone to vaporization. In addition, the fuel-air mixture that is not completely burned in the cylinder will also leak into the crankcase through the gap between the piston ring and the cylinder liner. Therefore, if the gas in the crankcase is directly discharged into the atmosphere, it will cause air pollution and affect the health of the operator. For this reason, the usual practice is to connect the intake pipes of the crankcase and the cylinder through a ventilation pipe, so that the gas in the crankcase passes into the intake pipe and then enters the cylinder to participate in combustion, thereby avoiding the discharge of harmful gases in the crankcase into the atmosphere. However, the ventilation pipe is connected between the crankcase and the intake pipe, and the structural stability is not strong, so the ventilation pipe may be disconnected. Therefore, it is necessary to monitor the connection status of the ventilation pipe. If the ventilation pipe is detected to be disconnected, the ECU (electronic control unit) will prompt the operator or issue an instruction to limit the operation of the internal combustion engine.

[0003] There are many methods in the prior art that can be used to monitor the connection status of the ventilation pipe. One of the methods is to use two wires installed outside the ventilation pipe to monitor whether the ventilation pipe is disconnected. For example, one end of the ventilation pipe is connected to the crankcase and the other end is connected to the intake pipe, so that the two wires form a series circuit through the connector on the intake pipe side and the connector on the crankcase side. If either end of the ventilation pipe is not connected well, the entire series circuit is in a disconnected state. Conversely, if both ends of the ventilation pipe are connected well, the entire series circuit is in a conducting state. Therefore, the connection status of the ventilation pipe can be monitored by two wires. However, due to vibration, high and low temperature changes, material degradation, and misoperation during maintenance during the operation of the internal combustion engine, one or two wires on the ventilation pipe may be disconnected. At this time, the signal monitored by the ECU is a circuit breaker signal, indicating that the ventilation pipe is not connected well, but the actual situation is that the ventilation pipe is connected well, but one or two wires are disconnected. This causes the ECU to misjudge the connection status of the ventilation pipe.

[0004] In addition to the ventilation pipes mentioned above, monitoring is also required in other pipelines, rails, rigid or flexible connectors, etc. that need to ensure the connection status. For example, in the petrochemical, pharmaceutical, food processing and other industries, there is also a need to monitor the connection status.

[0005] Therefore, it is necessary to improve the existing connection status monitoring device and monitoring method to overcome at least one of the above-mentioned problems. Summary of the invention

[0006] The purpose of the present application is to overcome the deficiencies of the prior art and to provide an improved connection status monitoring device and monitoring method to avoid misjudgment and improve reliability and maintainability.

[0007] To this end, according to one aspect of the present application, a connection status monitoring device is provided, comprising: a monitoring component, which includes a monitoring wire and a first electrical connector and a second electrical connector respectively arranged at both ends of the monitoring component, the monitoring component is configured to be fixed on a connecting member or formed as an integral body with the connecting member, wherein the connecting member has a first end and a second end, the first end is used to connect to a first device, and the second end is used to connect to a second device; and a control unit, which is connected to the first terminal and the second terminal of the monitoring component to apply a source voltage to the monitoring component; wherein the monitoring wire includes a first group of wires and a second group of wires, each group of wires includes at least two wires connected in parallel, the first group of wires and the second group of wires are configured to be connected in series through the first electrical connector and the first connector on the first device, and the second group of wires are configured to be connected to the second terminal through the second electrical connector and the second connector on the second device, and the first group of wires is connected to the first terminal; and the first terminal is connected to the ground terminal of the control unit, and the second terminal is connected to the voltage source of the control unit.

[0008] According to another aspect of the present application, a ventilation pipe is provided for a crankcase of an internal combustion engine, the ventilation pipe comprising the connection status monitoring device as described above, wherein the ventilation pipe is configured as a connecting piece, an intake pipe of a cylinder of the internal combustion engine is configured as a first device, and the crankcase of the internal combustion engine is configured as a second device.

[0009] According to another aspect of the present application, a connection status monitoring method is provided, comprising: fixing the connection status monitoring device as described above together with a connecting piece or forming it into one piece with the connecting piece; connecting the connecting piece with a first device and a second device, and forming a series circuit between a monitoring component and a control unit of the connection status monitoring device; applying a source voltage to the monitoring component; monitoring the voltage on the monitoring component; judging the connection status of the connecting piece based on the monitored voltage on the monitoring component; and outputting monitoring information.

[0010] By adopting the connection status monitoring device and monitoring method provided in the present application, the connection status of, for example, a pipeline can be detected more accurately, the reliability and maintainability of the monitoring device can be improved, and the self-check function of the monitoring device can also be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application, rather than to limit the scope of the present application. In the accompanying drawings:

[0012] Figure 1 is a schematic diagram of a connection state monitoring device for a ventilation pipe of a crankcase of an internal combustion engine, for example, according to an exemplary embodiment of the present application;

[0013] Figure 2 is a schematic flow chart of a connection status monitoring method according to an exemplary embodiment of the present application; and

[0014] Figure 3 is Figure 1 Schematic diagram of voltage-time variation monitored on the monitoring component shown in FIG. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present application are described in detail below in conjunction with examples. However, it should be understood by those skilled in the art that these exemplary embodiments are not meant to limit the present application in any way. In addition, the features in the embodiments of the present application may be combined with each other without conflict.

[0016] For the sake of brevity, other steps and components are omitted in the accompanying drawings, but this does not mean that the connection status monitoring method of the present application may not include other steps, nor does it mean that the connection status monitoring device of the present application may not include other components. It should be understood that the size, proportional relationship, number of components and order of steps of the components in the accompanying drawings are not intended to limit the present application. For example, although the steps are shown in a certain order in the flowchart, many of the steps can be rearranged, such as changing the order or executing in parallel, and can include additional steps.

[0017] It should be understood that, in this document, terms such as "first", "second", etc. are only used for descriptive purposes to distinguish one entity from another entity, and should not be understood as indicating or implying relative importance or implicitly indicating the order and quantity of the indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0018] The following is an example of a ventilation pipe for a crankcase of an internal combustion engine. Figure 1 The connection status monitoring device 100 of the present application is described in detail. Figure 1 As shown, the connection status monitoring device 100 of the present application may include a monitoring component 40 (in Figure 1 The monitoring assembly 40 is schematically shown in a dotted box in FIG. 4 , which includes a monitoring wire and a first electrical connector 41 and a second electrical connector 42 respectively disposed at both ends of the monitoring assembly 40. Figure 1In the embodiment, the monitoring wires are shown to include four wires L1, L2, L3 and L4, which are divided into two groups. The wires L1 and L2 are connected in parallel to form a first group of wires, and the wires L3 and L4 are connected in parallel to form a second group of wires. The monitoring assembly 40 also includes a first terminal L12 and a second terminal L34, wherein the first terminal L12 is connected to the parallel wires L1 and L2, and the second terminal L34 is connected to the parallel wires L3 and L4. It should be understood that in Figure 1 In the example shown, the monitoring component 40 is shown as two parts in the form of two dotted boxes, but the present application is not limited thereto. As long as the same circuit connection can be achieved, the monitoring component 40 can be formed as one body or divided into more parts.

[0019] The monitoring assembly 40 is configured to be fixed to the connecting member 50 (in Figure 1 The connector 50 is shown as a ventilation pipe in the figure) or is formed as a whole with the connector 50, wherein the connector 50 has a first end 51 and a second end 52, the first end 51 is used to connect with the first device 10, and the second end 52 is used to connect with the second device 20. In the example where the connector 50 is a ventilation pipe, the first device 10 can be an intake pipe connected to the cylinder of the internal combustion engine, and the second device 20 can be a crankcase of the internal combustion engine. Figure 1 As shown, the first device 10 includes a first connector 11, in which a first connecting line 12 is disposed, and the second device 20 includes a second connector 21, in which a second connecting line 22 is disposed. With the connection of the connector 50 to the first device 10 and the second device 20, not only the first connecting portion 13 of the first device 10 and the first end 51 of the connector 50 are structurally connected (for example, a pipe joint is formed by a clamp 53), and the second connecting portion 23 of the second device 20 and the second end 52 of the connector 50 are structurally connected (for example, a pipe joint is formed by a clamp 53), but also the first group of wires and the second group of wires of the monitoring component 40 can be connected in series through the first electrical connector 41 and the first connector 11 of the first device 10 (for example, through the first connecting line 12), and the second group of wires are connected to the second terminal L34 through the second electrical connector 42 and the second connector 21 on the second device 20 (for example, through the second connecting line 22), and the first group of wires (for example, at the second electrical connector 42) is connected to the first terminal L21. It should be noted that although in Figure 1 The first terminal L12 and the second terminal L34 are shown to be located at one end of the monitoring component 40 , but the first terminal L12 and the second terminal L34 may also be disposed at the other end or a middle position of the monitoring component 40 .

[0020] For example, in the example where the connecting member 50 is a ventilation pipe, one end of the ventilation pipe is connected to the inlet end of the intake pipe, and the other end is connected to the outlet end of the crankcase. At the same time, the wires of the monitoring component 40 are connected to the corresponding connectors on the intake pipe and the crankcase to form a series loop.

[0021] like Figure 1 As shown, the connection status monitoring device 100 also includes a control unit 30, which is connected to the first terminal L12 and the second terminal L34 of the monitoring component 40 to apply a source voltage U0 to the monitoring component 40. Specifically, the control unit 30 includes a voltage source 31, which provides a source voltage U0, for example, 5 volts. The second terminal L34 of the monitoring component 40 is connected to the voltage source 31, and a pull-up resistor 32 having a resistance R0 may be provided between the two. The control unit 30 may also include a ground terminal 34, and the first terminal L12 of the monitoring component 40 may be connected to the ground terminal 34. In addition, the control unit 30 may also include a voltage monitoring terminal 33, which is arranged between the pull-up resistor 32 and the second terminal L34. In the example where the connector 50 is a ventilation pipe, the control unit 30 may be an electronic control unit ECU of an internal combustion engine.

[0022] According to the above structure, each group of wires of the monitoring component 40 includes two wires in parallel, and a total of four wires form a series circuit. Therefore, when any one of the four wires is disconnected, the voltage detection value at the voltage monitoring terminal 33 will increase compared to the value when all four wires are turned on, because the resistance of the series circuit has increased, and the connector is still connected normally at this time; when one wire in each group is disconnected, the entire series circuit remains turned on, and the voltage detection value at the voltage monitoring terminal 33 will further increase, but the connector is still connected normally at this time. In this way, compared with the prior art, the monitoring device of the present application can avoid misjudgment caused by the disconnection of some wires, can more accurately detect the on and off status of the connection, and can also realize the self-test function of the monitoring device. The self-test function of the monitoring device will be further described below.

[0023] Of course, if two wires in a group of wires are disconnected at the same time, the control unit will still mistakenly think that the connection state is disconnected, but the probability of this happening is very small. For example, for the ventilation pipe of the crankcase of an internal combustion engine, this situation is mostly caused by abnormally high temperature of the internal combustion engine, which can be detected by other sensors of the internal combustion engine. In addition, the present application is not limited to the number of wire groups and roots listed above, but may include more groups and more wires to further improve the reliability of the monitoring device. Generally speaking, each group of wires may include at least two wires in parallel. Of course, too many wires may also bring about unfavorable factors such as increased cost, increased volume, and complex structure.

[0024] It should be noted that the monitoring component 40 can be formed as a separate component, for example, it can be fixed on the connector 50, so as to facilitate the modification or updating of the existing connector, or it can be formed as an integral part with the connector 50, for example, when manufacturing a new connector 50, the monitoring component 40 is integrated into the insulating protective layer of the connector 50.

[0025] like Figure 1 As shown, the two wires L1 and L2 in the first group of wires have resistances R1 and R2, respectively, and the two wires L3 and L4 in the second group of wires have resistances R3 and R4, respectively, wherein the resistances R1, R2, R3 and R4 may be different. By making each wire have a different resistance, it is possible to determine which wire is disconnected during the monitoring process, thereby realizing the self-checking function, which will be further described below in conjunction with specific examples. To further simplify the design and calculation, the resistances R1 and R2 may be the same, for example, the first resistance, and R3 and R4 may also be the same, for example, the second resistance, but the first resistance may be different from the first resistance. However, the first resistance may also be the same as the first resistance. That is, each wire may have the same resistance to further simplify the design of the monitoring wire.

[0026] To prevent multiple wires from being disconnected at the same time, the monitoring wires may be configured to be arranged away from each other around the connector 50. Specifically, the first group of wires and the second group of wires may be configured to be arranged away from each other around the connector 50, and at least two wires of each group of wires may also be configured to be arranged away from each other around the connector 50. For example, when each group of wires includes two wires, the four wires may be arranged 90 degrees apart from each other around the connector 50.

[0027] When the connector 50 is a flexible member, the monitoring wire may bend along with the connector 50 . Therefore, to prevent the monitoring wire from breaking due to excessive tension, the monitoring wire may be configured to be arranged around the connector 50 in a spiral, serpentine or wavy shape.

[0028] like Figure 1As shown, the two wires L1 and L2 in the first group of wires can be arranged side by side in the first electrical connector 41, and then can be respectively connected to the first connecting wire 12 in the first connector 11. Similarly, the two wires L3 and L4 in the second group of wires can be arranged side by side in the first electrical connector 41, and then can be respectively connected to the first connecting wire 12 in the first connector 11. That is, the first connecting wire 12 in the first connector 11 connects the two wires L1 and L2 in the first group of wires in parallel, connects the two wires L3 and L4 in the second group of wires in parallel, and connects the first group of wires and the second group of wires in series with each other. Similarly, the two wires L1 and L2 in the first group of wires can be arranged side by side in the second electrical connector 42, and connected together to the first terminal L12, while the two wires L3 and L4 in the second group of wires can be arranged side by side in the second electrical connector 42, and then can be respectively connected to one end of the second connecting wire 21 in the second connector 21, and the other end of the second connecting wire 22 can be connected to the second terminal L34.

[0029] It should be noted that in order to ensure that the at least two wires in each group of wires are connected in parallel to form a reliable connection and to avoid the at least two wires in each group of wires being disconnected at the parallel connection point, the at least two wires in each group of wires can be connected in parallel in the first electrical connector 41 and the second electrical connector 42 (e.g. Figure 1 The two wires L1 and L2 in the first group of wires shown in FIG. 1 form a parallel point in the second electrical connector 32, so that they can be protected by the housings of the first electrical connector 41 and the second connector 42. Similarly, the first terminal L12 and the second terminal L34 can also be arranged in the second electrical connector 42, that is, Figure 1 The first terminal L12 and the second terminal L34 shown in FIG. 4 may be located in the housing of the first electrical connector 42. Figure 1 As shown, the first terminal L12 and the second terminal L34 can be connected to the voltage source 31 and the ground terminal 34 of the control unit 30 via an optional control connector 35 .

[0030] According to the above description, the monitoring device of the present application can determine which wire in the monitoring wire is disconnected. Therefore, in order to make the monitoring device 100 maintainable, the monitoring wire can be replaceable. For example, each wire in the monitoring wire is replaceable. To facilitate replacement, each wire in the monitoring wire can be marked with a different color, number or pattern.

[0031] Refer to the following Figure 2 and Figure 3 The connection status monitoring method of the present application implemented by using the above-mentioned connection status monitoring device is described in detail.

[0032] like Figure 2As shown, at step S10, the connection state monitoring device 100 as described above is fixed together with the connecting member 50 or formed into one piece with the connecting member 50. As mentioned above, when used in the ventilation pipe of the crankcase of the internal combustion engine, the connection state monitoring device 100 can be fixed or connected relative to the ventilation pipe.

[0033] At step S20, the connector 50 is connected to the first device 10 and the second device 20, and the monitoring component 40 and the control unit 30 of the connection state monitoring device 100 form a series circuit. In this way, the connection state of the connector 50 is directly associated with the series circuit of the connection state monitoring device 100. For example, as the ventilation pipe is connected to the intake pipe and the crankcase, the electrical connectors at both ends of the monitoring device 40 are connected to the connectors on the first device 10 and the second device 20, so that the monitoring component 40 and the control unit 30 form a series circuit. When the series circuit is disconnected, it can be determined that the connector 50 is also disconnected.

[0034] At step S30, a source voltage is applied to the monitoring component 40. Specifically, a source voltage U0, for example, 5 volts, is applied to the monitoring wire through the second terminal L34 by the voltage source 31 of the control unit 30.

[0035] At step S40 , the voltage on the monitoring component 40 is monitored. Specifically, the ground voltage of the monitoring component 40 can be monitored through the voltage monitoring terminal 33 of the control unit 30 .

[0036] At step S50, the connection state of the connector 50 is determined based on the voltage on the monitoring component 40. This step involves the specific setting of each wire in the monitoring component 40. Figure 3 Described in further detail.

[0037] At step S60, monitoring information may be output, for example, warning information such as sound, text, or vision may be output to remind the operator.

[0038] Figure 3 4 shows the voltage-time variation monitored on the monitoring component 40, wherein the horizontal axis represents time T and the vertical axis represents voltage U. Specifically, Figure 3As shown in, in step S50, when the monitored voltage on the monitoring component 40 is the source voltage U0 (for example, 5 volts), it is determined that the series circuit in the monitoring component 40 is open and the connection state of the connector 50 is faulty; when the monitored voltage on the monitoring component 40 is 0, it is determined that a short circuit occurs between the first group of wires and the second group of wires in the monitoring component 40; when the monitored voltage on the monitoring component 40 is a predetermined value Un between the source voltage U0 and 0, it is determined that the series circuit is turned on and the connection state of the connector 50 is normal; when the monitored voltage on the monitoring component 40 is between the source voltage U0 and the predetermined value Un (for example, Figure 3 When the voltages U1 and U2 shown in FIG. 1 are greater than or equal to the voltages U1 and U2 shown in FIG. 1 , it is determined that the series circuit is turned on and the connection state of the connector 50 is normal, but at least one wire in the monitoring assembly 40 is disconnected.

[0039] Furthermore, when the monitored voltage on the monitoring component 40 is between the source voltage U0 and the predetermined value Un, based on the monitored voltage on the monitoring component 40 and the resistance of each wire of the monitoring component 40, it is possible to determine and indicate which one or several wires in the monitoring component 40 are disconnected, that is, the position of at least one disconnected wire in the monitoring component 40 can be determined and indicated.

[0040] The above-mentioned determination steps are further described in detail below through specific examples. Figure 1 As shown, the monitoring component 40 includes four wires L1, L2, L3 and L4, which have resistances R1, R2, R3 and R4 respectively, wherein the wires L1 and L2 are connected in parallel to form a first group of wires, and the wires L3 and L4 are connected in parallel to form a second group of wires, and the first group of wires and the second group of wires pass through the connectors on the first device 10 and the second device 20 to form a series loop with the voltage source 31 and the ground terminal 34 of the control unit 30. Under normal circumstances, the equivalent resistance Re of the monitoring component 40 can be calculated by the following formula:

[0041]

[0042] At this time, the source voltage provided by the voltage source 31 is U0, and the resistance of the pull-up resistor 32 is R0. Then, the normal voltage Un on the monitoring component 40 monitored by the voltage monitoring terminal 33 can be calculated by the following formula:

[0043]

[0044] Therefore, the normal voltage Un is the voltage monitored on the monitoring component 40 when the connection status monitoring device 100 itself is normal and the connection status of the connection member 50 is normal.

[0045] When any one of the four wires L1, L2, L3 and L4 is disconnected, for example, wire L1 is disconnected, the equivalent resistance of the monitoring component 40 is:

[0046]

[0047] At this time, the equivalent resistance Re of the monitoring component 40 is greater than the equivalent resistance in normal conditions, and the first voltage U1 monitored on the monitoring component 40 is higher than the normal voltage Un in normal conditions, but lower than the source voltage U0. In this case, although the monitored first voltage U1 increases, it does not reach the source voltage U0, so the connection state is still normal.

[0048] When two of the four wires L1, L2, L3 and L4 are disconnected and the series circuit is turned on, for example, wires L1 and L3 are disconnected, the equivalent resistance of the monitoring component 40 is:

[0049] Re=R2+R4

[0050] At this time, the equivalent resistance Re of the monitoring component 40 is further greater than the equivalent resistance in the normal case, and the second voltage U2 monitored on the monitoring component 40 is further higher than the voltage Un in the normal case, but still lower than the source voltage U0. In this case, although the monitored second voltage U1 is further increased, it does not reach the source voltage U0, so the connection state is still normal.

[0051] When two or more of the four wires L1, L2, L3 and L4 are disconnected and the series loop is disconnected, the voltage monitored on the monitoring component 40 is equal to the source voltage U0, which indicates a connection state failure.

[0052] When two or more of the four wires L1 , L2 , L3 , and L4 are short-circuited to short-circuit the monitoring assembly 40 , the voltage monitored on the monitoring assembly 40 is equal to the ground voltage, indicating that the monitoring device 100 is faulty.

[0053] Further, according to the corresponding resistance values ​​of the four wires L1, L2, L3 and L4, the specific value of the voltage monitored on the monitoring component 40 when any one or two of them are disconnected can be calculated. Therefore, during the monitoring process, when the voltage on the monitoring component 40 is monitored to be a specific value, it can be inferred which one or two wires are disconnected, and warning information can be output in a variety of ways, thereby realizing the self-checking function of the monitoring device. In addition, in the aforementioned monitoring and judgment steps, a certain error range can be allowed, for example, the monitored voltage is allowed to be within the range of ±10% of the calculated voltage. The specific calculation process can be implemented by the above formula, so the detailed calculation steps are omitted in this article, but this does not affect the understanding and implementation of the inventive concept of the present application.

[0054] It should be noted that in the foregoing example, the monitoring component 40 includes only four wires. However, for a monitoring component including more wires, the monitoring of the connection status and the self-test function can still be achieved by repeating the above steps and calculation process.

[0055] In the connection status monitoring device and monitoring method of the present application, through the design of the monitoring component, not only can the misjudgment of the connection status be reduced and the connection status can be monitored more accurately, but also it has a self-test function, which can determine which wire of the monitoring component is disconnected, thereby improving maintainability.

[0056] The present application has been described in detail above in conjunction with specific embodiments. However, the above description and the embodiments shown in the accompanying drawings should be understood to be exemplary and not to limit the present application. For those skilled in the art, various modifications or variations can be made to the present application without departing from the spirit of the present application, and these modifications or variations do not depart from the scope of the present application.

Claims

1. A connection status monitoring device (100), comprising: A monitoring assembly (40), comprising a monitoring wire and a first electrical connector (41) and a second electrical connector (42) respectively arranged at two ends of the monitoring assembly (40), wherein the monitoring assembly (40) is configured to be fixed on a connecting member (50) or to be formed as one with the connecting member (50), wherein the connecting member (50) has a first end (51) and a second end (52), wherein the first end (51) is used to connect to a first device (10), and the second end (52) is used to connect to a second device (20); and A control unit (30) connected to a first terminal (L12) and a second terminal (L34) of the monitoring component (40) to apply a source voltage (U0) to the monitoring component (40); The monitoring wire comprises a first group of wires and a second group of wires, each group of wires comprises at least two wires connected in parallel, the first group of wires and the second group of wires are configured to be connected in series through the first electrical connector (41) and the first connector (11) on the first device (10), and the second group of wires is configured to be connected to the second terminal (L34) through the second electrical connector (42) and the second connector (21) on the second device (20), and the first group of wires is connected to the first terminal (L12); and The first terminal (L12) is connected to a ground terminal (34) of the control unit (30), and the second terminal (L34) is connected to a voltage source (31) of the control unit (30).

2. The connection status monitoring device (100) according to claim 1, characterized in that: Each of the first set of wires and the second set of wires has a different resistance.

3. The connection status monitoring device (100) according to claim 1, characterized in that: Each of the first group of wires has a first resistance, and each of the second group of wires has a second resistance different from the first resistance.

4. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The monitoring wires are configured to be arranged away from each other around the connecting piece (50).

5. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The monitoring wire is configured to be arranged around the connecting piece (50) in a spiral, serpentine or wavy shape.

6. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The first terminal (L12) and the second terminal (L34) are disposed in the second electrical connector (42).

7. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The at least two parallel wires included in each group of wires are connected in parallel in the first electrical connector (41) and the second electrical connector (42), respectively.

8. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The monitoring lead is replaceable.

9. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: Each of the monitoring wires is marked with a different color, number or pattern.

10. The connection status monitoring device (100) according to any one of claims 1 to 3, characterized in that: The control unit (30) includes a voltage monitoring terminal (33) configured to monitor the voltage on the monitoring component (40).

11. A ventilation pipe for a crankcase of an internal combustion engine, characterized in that: The ventilation pipe comprises a connection status monitoring device (100) according to any one of claims 1 to 10, wherein the ventilation pipe is configured as a connector (50), an intake pipe of a cylinder of the internal combustion engine is configured as a first device (10), and a crankcase of the internal combustion engine is configured as a second device (20).

12. The ventilation duct according to claim 11, characterized in that: The control unit (30) of the connection state monitoring device (100) is configured as an electronic control unit of the internal combustion engine.

13. A connection status monitoring method, comprising: Fixing the connection status monitoring device (100) according to any one of claims 1 to 10 together with the connecting member (50) or forming it into one piece with the connecting member (50); The connecting member (50) is connected to the first device (10) and the second device (20), and the monitoring component (40) and the control unit (30) of the connection status monitoring device (100) form a series loop; Applying a source voltage (U0) to the monitoring component (40); Monitoring the voltage on the monitoring component (40); Based on the monitored voltage on the monitoring component (40), determining the connection state of the connecting member (50); and Output monitoring information.

14. The connection status monitoring method according to claim 13, characterized in that: The connection status monitoring method further includes: When the monitored voltage on the monitoring component (40) is the source voltage (U0), it is determined that the series circuit is disconnected and a connection state of the connecting member (50) is faulty; When the monitored voltage on the monitoring component (40) is 0, it is determined that a short circuit occurs between the first group of wires and the second group of wires in the monitoring component (40); When the monitored voltage on the monitoring component (40) is a predetermined value (Un) between the source voltage (U0) and 0, it is determined that the series circuit is conducting and the connection state of the connecting member (50) is normal; and When the monitored voltage on the monitoring component (40) is between the source voltage (U0) and the predetermined value (Un), it is determined that the series circuit is conductive and the connection state of the connector (50) is normal, but at least one wire in the monitoring component (40) is disconnected.

15. The connection status monitoring method according to claim 14, characterized in that: The connection status monitoring method further includes: When the monitored voltage on the monitoring component (40) is between the source voltage (U0) and the predetermined value (Un), the position of the at least one disconnected wire in the monitoring component (40) is determined and indicated based on the monitored voltage on the monitoring component (40) and the resistance of each wire in the monitoring component (40).

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