CN110779727A - Motion monitoring system - Google Patents

Abstract

The invention provides an action monitoring system, wherein the throttle valve (75) of the action monitoring system is subjected to the pressure of the driving oil to close the outlet (755) when the driving oil is boosted, and opens the outlet (755) when the driving oil is not boosted. The pressure sensor (765) is arranged near the outlet (755) of the throttle valve (75). A pressure sensor (765) measures the pressure of the drive oil flowing from the outlet (755). The storage unit (766) calculates the pressure of the driving oil flowing out from the outlet (755) of the throttle valve (75) when the driving object (ie, the exhaust valve (25)) of the first hydraulic driving line (71) is operating normally. Periodic fluctuations are stored in advance as reference fluctuations. A detection unit (767) detects an abnormality of the throttle valve (75) by comparing the measured value of the pressure sensor (765) with a reference fluctuation. Thereby, abnormality of the throttle valve (75) provided in the first hydraulic drive line (71) can be automatically detected.

Description

motion monitoring system

technical field

The present invention relates to an operation monitoring system, which is an operation monitoring system for a throttle valve that is installed on a hydraulic drive line of a diesel engine to drive oil exhaust.

Background technique

Conventionally, in a marine diesel engine, an exhaust port for discharging gas combusted in a combustion chamber and an exhaust valve for opening and closing the exhaust port are provided, and the operation of the exhaust valve is performed by a stroke sensor. monitor.

In addition, Japanese Patent Laid-Open No. 6-257456 (Document 1) discloses a technique in which a sensor detects the supplied compressed air on an air pressure drive line that drives an exhaust valve of a twin-turbo engine with compressed air. (that is, the pressure of the driving air), the presence or absence of abnormal operation of the exhaust valve is determined based on the change in the pressure of the compressed air.

Furthermore, in a marine diesel engine, a throttle valve for exhausting driving oil is provided in a hydraulic drive line that drives an exhaust valve. The throttle valve is opened in a state where the drive oil is not pressurized, and the gas contained in the drive oil is discharged to the outside from the hydraulic drive line via the throttle valve. In addition, the throttle valve is closed so that the drive oil does not leak to the outside in a state where the drive oil has been boosted.

If the throttle valve is abnormally opened and is in a normally open state, the pressure of the driving oil may be insufficient during boosting, and the operation of the exhaust valve may be abnormal. In addition, when the throttle valve is in the normally closed state, the gas in the driving oil cannot be removed, and there is a possibility that abnormal operation of the exhaust valve due to cavitation may occur. However, the throttle valve is a relatively small part, and it is difficult to install a stroke sensor or the like in the vicinity of the throttle valve. Therefore, the operation monitoring of the throttle valve has not been performed so far.

SUMMARY OF THE INVENTION

The present invention is directed to an operation monitoring system for a throttle valve installed on a hydraulic drive line of a diesel engine for driving oil to be exhausted, and the object of the present invention is to automatically detect abnormality of the throttle valve.

[Technical means to solve the problem]

An operation monitoring system according to a preferred aspect of the present invention includes a throttle valve having an inlet and an outlet for driving oil, and the outlet is closed by the pressure of the driving oil when the driving oil is boosted, and the outlet is opened when the driving oil is not boosted. the outlet; a pressure sensor arranged near the outlet of the throttle valve, and measures the pressure of the driving oil flowing out from the outlet; and a storage part, which stores the pressure from the throttle valve when the driving object of the hydraulic driving line is normally operated The periodic fluctuation of the pressure of the driving oil flowing out of the outlet is stored in advance as a reference fluctuation; and a detection unit detects an abnormality of the throttle valve by comparing the measured value of the pressure sensor with the reference fluctuation. According to the operation monitoring system, abnormality of the throttle valve can be automatically detected.

Preferably, the driven object of the hydraulic drive line includes an exhaust valve of a diesel engine.

Preferably, at least a part of the driving oil flowing out of the outlet of the throttle valve is guided to the sliding portion of the exhaust valve and used as lubricating oil.

Preferably, the driven object of the hydraulic drive line includes a fuel supply pump of a diesel engine.

It is preferable that the abnormality detected by the detection unit includes the normal opening of the throttle valve.

Preferably, the abnormality detected by the detection unit includes normally closing of the throttle valve.

Preferably, the operation monitoring system further includes an outflow line that guides driving oil flowing out of the outlet of the throttle valve. The pressure sensor measures the pressure of the driving oil in the lower part of the outflow line.

Preferably, the operation monitoring system further includes an outflow line that guides driving oil flowing out of the outlet of the throttle valve. The outflow line is provided independently of a drain line through which drive oil discharged from a portion other than the throttle valve of the hydraulic drive line flows.

The object and other objects, features, aspects, and advantages will be clarified by the following detailed description of the invention with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a diagram showing a configuration of a diesel engine according to an embodiment.

2 is a cross-sectional view showing the vicinity of an exhaust valve hydraulic cylinder.

3 is a cross-sectional view showing a throttle valve.

FIG. 4 is a cross-sectional view showing a throttle valve.

FIG. 5 is a diagram showing a configuration of a monitoring unit.

FIG. 6 is a diagram showing an example of a reference fluctuation of the drive oil.

FIG. 7 is a diagram showing an example of the pressure fluctuation of the driving oil when the operation of the throttle valve is abnormal.

FIG. 8 is a diagram showing an example of the pressure fluctuation of the driving oil when the operation of the throttle valve is abnormal.

9 is a cross-sectional view showing the vicinity of the fuel supply pump.

Explanation of symbols

1: Diesel engine

25: Exhaust valve

62: Fuel supply pump

71: The first hydraulic drive line

72: Second oil pressure drive line

75, 75a: Throttle

76: Motion Monitoring System

754: Entrance

755: Exit

765, 765a: Pressure sensor

766: Storage Department

767: Inspection Department

769, 769a: Outflow line

Detailed ways

FIG. 1 is a diagram showing a configuration of a diesel engine 1 according to an embodiment of the present invention. The diesel engine 1 illustrated in FIG. 1 is a two-stroke engine used as a main engine of a ship. In FIG. 1 , the configuration of a part of the diesel engine 1 is shown in cross section.

The diesel engine 1 includes a cylinder 2, a piston 3, an exhaust valve 25, an exhaust path 241, an exhaust pipe 42, a supercharger 5, an air cooler 43, a scavenging pipe 41, a scavenging chamber 231, a fuel supply mechanism 6, Hydraulic drive mechanism 7.

The cylinder 2 includes a cylinder liner 21 and a cylinder head 22 . The cylinder liner 21 is a substantially cylindrical member. The cylinder head 22 is a substantially covered cylindrical member attached to the upper portion of the cylinder liner 21 . The cylinder head 22 covers the upper opening of the cylinder liner 21 . In the vicinity of the lower end portion of the cylinder liner 21, a plurality of through holes are provided in a circumferential shape. The plurality of through holes are scavenging ports 23 for supplying scavenging air to be described later into the cylinder 2 . A scavenging chamber 231 is arranged around the scavenging port 23 . The scavenging port 23 is connected to the scavenging pipe 41 via the scavenging chamber 231 .

An exhaust port 24 for discharging the gas in the cylinder 2 to the outside of the cylinder 2 is provided in the upper end portion of the cylinder head 22 . The shape of the exhaust port 24 in plan view (that is, the shape viewed from the vertical direction in FIG. 1 ) is substantially circular. Furthermore, the up-down direction in FIG. 1 does not necessarily need to coincide with the direction of gravity.

The exhaust valve 25 is arranged at a position overlapping the exhaust port 24 in the vertical direction, and opens and closes the exhaust port 24 . The exhaust valve 25 includes a valve body 251 and a valve stem 252 . The valve body 251 is a substantially conical portion located below the exhaust port 24 . The diameter of the valve body 251 in plan view is larger than the diameter of the exhaust port 24 in plan view. The valve stem 252 is a substantially cylindrical portion extending upward from the upper end portion of the valve body 251 . The upper end portion of the valve rod 252 is accommodated in the inside of the exhaust valve hydraulic cylinder 253 provided above the cylinder 2, and is supported so as to be movable in the vertical direction.

The exhaust valve 25 is moved in the vertical direction by the hydraulic drive mechanism 7 . As shown by the solid line in FIG. 1 , when the valve body 251 of the exhaust valve 25 is separated downward from the exhaust port 24 , the exhaust port 24 is opened, and the gas in the cylinder 2 is discharged to the cylinder through the exhaust port 24 . 2 outside. On the other hand, when the valve body 251 is in the position shown by the double-dot chain line in FIG. 1 , the valve body 251 is in contact with the peripheral edge of the exhaust port 24 and closes the exhaust port 24. Therefore, the inside of the cylinder 2 The gas will not be discharged from the exhaust port 24. In the following description, the position of the exhaust valve 25 indicated by the solid line in FIG. 1 is referred to as the "open position", and the position of the exhaust valve 25 indicated by the two-dot chain line is referred to as the "closed position". The exhaust valve 25 is movable in the vertical direction between an open position and a closed position above the open position.

With the exhaust valve 25 at the open position, the gas (hereinafter referred to as "exhaust") discharged from the exhaust port 24 to the outside of the cylinder 2 is guided to the exhaust pipe 42 via the exhaust passage 241 . In the actual diesel engine 1 , a plurality of cylinders 2 are arranged in parallel, and the plurality of cylinders 2 are connected to one scavenging pipe 41 and one exhaust pipe 42 .

The exhaust gas in the exhaust pipe 42 is sent to the supercharger 5 serving as a turbocharger, and is supplied to the turbine 51 of the supercharger 5 . The exhaust gas used for the rotation of the turbine 51 is discharged to the outside of the diesel engine 1 via a reduction catalyst or the like (not shown) for reducing nitrogen oxides (NOx). The compressor 52 of the supercharger 5 pressurizes the intake air (air) drawn from the outside of the diesel engine 1 by the rotational force generated by the turbine 51 . The pressurized air (hereinafter referred to as "scavenging air") is cooled by a refrigerant such as seawater in the air cooler 43 and then supplied into the scavenging air pipe 41 . In this way, in the supercharger 5, the intake air is pressurized by the exhaust gas, and the scavenging air is generated.

The piston 3 can move in the vertical direction in FIG. 1 within the cylinder 2 . In FIG. 1 , the position of the piston 3 indicated by the two-dot chain line is the top dead center, and the position of the piston 3 indicated by the solid line is the bottom dead center. The piston 3 includes a piston head 31 and a piston rod 32 . The piston head 31 is a thick, substantially disk-shaped portion into which the cylinder liner 21 is inserted. The piston rod 32 is a substantially cylindrical portion whose upper end is connected to the lower surface of the piston head 31 . The lower end of the piston rod 32 is connected to a crank mechanism (not shown). In the diesel engine 1 illustrated in FIG. 1 , the space enclosed by the cylinder liner 21 , the cylinder head 22 , the exhaust valve 25 , and the upper surface of the piston head 31 is the combustion chamber 20 for combusting gas.

The fuel supply mechanism 6 includes a fuel injection unit 61 and a fuel supply pump 62 . The fuel injection portion 61 is a nozzle attached to the cylinder head 22 so that the front end portion thereof faces the combustion chamber 20 . The fuel supply pump 62 is connected to a fuel tank (not shown) via a fuel pipe, and sends the fuel in the fuel tank to the fuel injection unit 61 . The fuel injection unit 61 injects the fuel supplied from the fuel supply pump 62 into the combustion chamber 20 . The fuel supply pump 62 is also driven by the aforementioned hydraulic drive mechanism 7 .

Next, the operation of the diesel engine 1 will be described. In the diesel engine 1, when the piston 3 ascends from the bottom dead center and is located near the top dead center, the exhaust valve 25 is located at the closed position, and the exhaust port 24 is closed. Therefore, the gas in the combustion chamber 20 (a scavenging gas, which will be described later) is compressed. Then, the fuel is injected into the combustion chamber 20 from the fuel injection unit 61, the vaporized fuel is self-ignited, and the gas in the combustion chamber 20 is combusted (ie, exploded). Thereby, the piston 3 is pressed downward and moves to the bottom dead center. In addition, the gas in the combustion chamber 20 does not necessarily need to be self-igniting, and the ignition of the gas in the combustion chamber 20 may be performed using a spark plug or the like.

After the gas in the combustion chamber 20 is combusted, before the piston 3 reaches the bottom dead center, the exhaust valve 25 is lowered from the closed position to the open position, and the exhaust port 24 is opened. Thereby, the exhaust of the combusted gas in the combustion chamber 20 is started. As described above, the gas exhausted from the combustion chamber 20 (ie, exhaust gas) is supplied to the turbine 51 of the supercharger 5 via the exhaust path 241 and the exhaust pipe 42, and is exhausted to the outside of the diesel engine 1 through a reduction catalyst or the like.

When the piston 3 descends near the bottom dead center and the upper surface of the piston head 31 moves to the lower side than the scavenging port 23 , the scavenging port 23 is opened, and the combustion chamber 20 and the scavenging chamber 231 are communicated via the scavenging port 23 . Thereby, the scavenging gas in the scavenging chamber 231 is supplied into the combustion chamber 20 .

Piston 3 turns upward after reaching bottom dead center. The upper surface of the piston head 31 rises to the upper side than the scavenging port 23, whereby the scavenging port 23 is closed, and the supply of the scavenging gas into the combustion chamber 20 is stopped. Then, the exhaust port 24 is closed by the exhaust valve 25, and the combustion chamber 20 is closed. The scavenging gas in the combustion chamber 20 is compressed by the further rise of the piston 3 . Then, when the piston 3 reaches the vicinity of the top dead center, the fuel is injected from the fuel injection portion 61 into the combustion chamber 20 , and the above-described combustion occurs in the combustion chamber 20 . In the diesel engine 1, the above-described operations are repeated.

Next, the details of the hydraulic drive mechanism 7 will be described. The hydraulic drive mechanism 7 includes a first hydraulic drive line 71 , a second hydraulic drive line 72 , a drive oil tank 73 , and a drive oil pump 74 . The drive oil tank 73 stores drive oil. The drive oil pump 74 sends the drive oil in the drive oil tank 73 to the first hydraulic drive line 71 and the second hydraulic drive line 72 . The first hydraulic drive line 71 is connected to the exhaust valve hydraulic cylinder 253 to drive the exhaust valve 25 . The second hydraulic drive line 72 is connected to the fuel supply mechanism 6 and drives the fuel supply pump 62 . That is, the hydraulic drive line to which the exhaust valve 25 is driven is referred to as the "first hydraulic drive line 71". In addition, the hydraulic drive line to which the fuel supply pump 62 is driven is referred to as the "second hydraulic drive line 72".

FIG. 2 is an enlarged cross-sectional view showing the vicinity of the exhaust valve hydraulic cylinder 253 . In FIG. 2, the structure of the 1st hydraulic drive line 71 is shown together. The first hydraulic drive line 71 includes a pipe 711 , a valve 712 , a flow path 713 , a hydraulic piston 714 , a spring 715 , and a throttle valve 75 . The flow passage 713 is formed in the exhaust valve hydraulic cylinder 253 . The hydraulic piston 714 , the spring 715 , and the throttle valve 75 are accommodated in the exhaust valve hydraulic cylinder 253 . An operation monitoring system 76 of the throttle valve 75 is provided near the throttle valve 75 .

The piping 711 guides the driving oil sent from the driving oil pump 74 (see FIG. 1 ) to the flow path 713 . In FIG. 2 , parallel oblique lines are also attached to the drive oil flowing in the flow passage 713 and the like. The valve 712 is provided in the piping 711 and controls the supply of the driving oil to the flow passage 713 . By opening and closing the valve 712 , the state of the driving oil in the first hydraulic drive line 71 is switched between a boosted state and a non-pressurized state. In FIG. 2 , the first hydraulic drive line 71 is shown when the pressure is not boosted.

The flow passage 713 is connected to the upper end portion of the hydraulic piston 714 and the lower end portion of the throttle valve 75 . The hydraulic piston 714 is a generally covered cylindrical member. A spring 715 is accommodated in the hydraulic piston 714 . The lower end portion of the spring 715 is in contact with the upper end surface of the valve stem 252 of the exhaust valve 25 . The valve rod 252 is pressed against the spring 715 (ie, upward) by the air piston 254 provided in the exhaust valve hydraulic cylinder 253 . The spring 715 is, for example, a coil spring. The spring 715 may be various elastic members other than the coil spring.

In the first hydraulic drive line 71 during non-pressurization, the valve stem 252 , the hydraulic piston 714 , and the spring 715 are pressed upward by the pressure of the air piston 254 . The upper end portion of the hydraulic piston 714 is in contact with or close to the top cover portion of the exhaust valve hydraulic cylinder 253, and the exhaust valve 25 is in a closed state. On the other hand, in the first hydraulic drive line 71 at the time of boosting, the spring 715 is pressed downward by the pressure of the boosted driving oil. Thereby, the spring 715 and the valve rod 252 are moved downward against the pressure of the air piston 254, and the exhaust valve 25 is brought into an open state. In the first hydraulic drive line 71, when the boosting of the drive oil is completed and the pressure is returned to the non-boosting state, the valve rod 252 and the spring 715 are pushed up by the pressure of the air piston 254, and the exhaust valve 25 is closed.

The driving oil in the exhaust valve hydraulic cylinder 253 flows out from a plurality of orifices provided on the side wall of the exhaust valve hydraulic cylinder 253, and is received by the driving oil reservoir 255 provided on the lower side of the air piston 254, and Temporary storage. The driving oil stored in the driving oil reservoir 255 flows downward from the gap between the driving oil reservoir 255 and the valve stem 252 along the outer surface of the valve stem 252 . As a result, frictional resistance is reduced at the sliding portion of the exhaust valve 25 (eg, the portion between the support portion supporting the valve stem 252 and the valve stem 252 ), and the vertical movement of the exhaust valve 25 can be smoothly performed. In addition, the sliding portion is hermetically sealed.

The driving oil flowing down from the driving oil reservoir 255 is temporarily stored as drain oil in a crankcase (not shown) located on the lower side of the cylinder 2 . The drain oil is sucked up by the circulation pump, and after being purified by a filter or the like, it is returned to the driving oil tank 73 to be reused. In the following description, the flow path of the drive oil from the exhaust valve hydraulic cylinder 253 to the crankcase is referred to as a "drain line".

The throttle valve 75 is a mechanical valve that exhausts the drive oil of the first hydraulic drive line 71 . The throttle valve 75 is arranged, for example, above the hydraulic piston 714 in the first hydraulic drive line 71 . The upper end portion of the throttle valve 75 is arranged inside the buffer portion 716 formed in the exhaust valve hydraulic cylinder 253 . The buffer portion 716 is a relatively small space for temporarily storing the driving oil flowing out from the flow passage 713 via the throttle valve 75 .

3 and 4 are cross-sectional views showing the throttle valve 75 in an enlarged manner. FIG. 3 shows the throttle valve 75 in the open state when the first hydraulic drive line 71 is not boosted. FIG. 4 shows the throttle valve 75 in a closed state when the pressure of the first hydraulic drive line 71 is increased. The throttle valve 75 is a substantially cylindrical member centered on the central axis J1. In the example shown in FIG. 3 , the central axis J1 is directed substantially in the up-down direction. The length in the vertical direction of the throttle valve 75 is, for example, 4.3 cm to 5.5 cm.

The throttle valve 75 includes an outer cylindrical portion 751 , an inner cylindrical portion 752 , and an elastic member 753 . The outer cylindrical portion 751 and the inner cylindrical portion 752 are respectively substantially cylindrical members extending in the substantially vertical direction around the central axis J1. The outer cylindrical portion 751 has a lower opening (ie, an inlet 754 for driving oil) and an upper opening (ie, an outlet 755 for driving oil) at the lower end and the upper end, respectively. The inner cylindrical portion 752 is arranged inside the outer cylindrical portion 751 between the lower opening and the upper opening. The inner cylinder portion 752 is movable in the up-down direction between the position shown in FIG. 3 and the position shown in FIG. 4 . The elastic member 753 is arranged between the outer surface of the inner cylindrical portion 752 and the inner surface of the outer cylindrical portion 751 in a state of being compressed in the vertical direction. The elastic member 753 presses the inner cylindrical portion 752 downward. In the example shown in FIGS. 3 and 4 , the elastic member 753 is a coil spring.

A plurality of orifices 756 , each of which penetrates through the inner cylindrical portion 752 , is provided on the upper side surface of the inner cylindrical portion 752 . In the throttle valve 75 , the inner space of the inner cylindrical portion 752 and the inner space of the outer cylindrical portion 751 are communicated via a plurality of orifices 756 . In the example shown in FIGS. 3 and 4 , the four orifices 756 are arranged at substantially equal angular intervals in the circumferential direction with the center axis J1 as the center. The number and arrangement of the orifices 756 can be appropriately changed.

In the first hydraulic drive line 71 during non-pressurization shown in FIG. 3 , the drive oil in the flow path 713 (refer to FIG. 2 ) flows into the throttle valve 75 through the lower opening, and the inner space of the inner cylindrical portion 752 is upward. square flow. The driving oil flows out from the inner space of the inner cylindrical portion 752 to the space between the upper outer surface of the inner cylindrical portion 752 and the inner surface of the outer cylindrical portion 751 through the plurality of orifices 756, and flows out to the throttle valve through the upper opening 75's exterior. The gas in the driving oil of the first hydraulic driving line 71 is discharged to the outside of the first hydraulic driving line 71 together with the driving oil flowing out from the throttle valve 75 to the outside. In the throttle valve 75, the lower opening is the inlet of the driving oil, and the upper opening is the outlet of the driving oil. In the following description, the lower opening and the upper opening of the throttle valve 75 are referred to as "inlet 754" and "outlet 755", respectively.

On the other hand, in the first hydraulic drive line 71 at the time of pressure increase shown in FIG. 4 , the inner cylinder portion 752 is pressed upward by the pressure of the boosted drive oil. Thereby, the inner cylindrical portion 752 moves upward while compressing the elastic member 753 , and the outer surface of the upper end portion of the inner cylindrical portion 752 comes into contact with the inner surface of the outer cylindrical portion 751 . As a result, the outlet 755 is closed by the inner cylindrical portion 752, and the outflow of the driving oil from the throttle valve 75 is stopped. In the throttle valve 75, when the boosting of the driving oil is completed and the pressure is returned to the non-pressurized state, the inner cylinder portion 752 is pressed down by the restoring force of the elastic member 753, and the outlet 755 is opened.

As shown in FIG. 2 , the operation monitoring system 76 includes the above-described throttle valve 75 , a sensor unit 761 , a monitoring unit 762 , and an outflow line 769 . The sensor unit 761 is attached to the exhaust valve hydraulic cylinder 253 near the outlet 755 of the throttle valve 75 , and is connected to the buffer unit 716 . The sensor portion 761 includes a mounting portion 764 and a pressure sensor 765 . The attachment portion 764 is attached to the outer side wall of the exhaust valve hydraulic cylinder 253 on the side of the buffer portion 716 . Inside the mounting portion 764 is formed a flow path through which the driving oil flowing from the buffer portion 716 to the outside of the exhaust valve hydraulic cylinder 253 flows. The pressure sensor 765 is arranged on the lower side of the flow path of the mounting portion 764 , and continuously measures the pressure of the driving oil flowing in the flow path (that is, the pressure of the driving oil flowing out from the outlet 755 of the throttle valve 75 ) at the lower part of the flow path. pressure). The pressure sensor 765 is arranged below the outlet 755 of the throttle valve 75 . The output from the pressure sensor 765 is sent to the monitoring unit 762 .

One end of the outflow line 769 is connected to the mounting portion 764 . The flow path inside the mounting portion 764 is also considered to be a part of the outflow line 769 . The outflow line 769 is a pipe extending upward from the outside of the exhaust valve hydraulic cylinder 253 to the upper side of the outlet 755 of the throttle valve 75 and then extending downward. The other end of the outflow line 769 is connected to the exhaust valve hydraulic cylinder 253 , and communicates with the internal space of the exhaust valve hydraulic cylinder 253 above the drive oil reservoir 255 . The outflow line 769 is provided independently of the drain line through which the drive oil discharged from the portion other than the throttle valve 75 of the first hydraulic drive line 71 flows. Furthermore, the outflow line 769 may be provided inside the exhaust valve hydraulic cylinder 253 .

The outflow line 769 returns the drive oil that has flowed out of the buffer portion 716 to the outside of the exhaust valve hydraulic cylinder 253 to the inside of the exhaust valve hydraulic cylinder 253 . The driving oil guided into the exhaust valve hydraulic cylinder 253 by the outflow line 769 is received by the above-described driving oil reservoir 255 and temporarily stored. The driving oil stored in the driving oil reservoir 255 flows downward along the outer surface of the valve stem 252 from the gap between the driving oil reservoir 255 and the valve stem 252 as described above. As a result, frictional resistance is reduced in the sliding portion of the exhaust valve 25, and the movement of the exhaust valve 25 in the vertical direction is smoothly performed. In addition, the sliding portion is hermetically sealed.

The outflow line 769 guides the driving oil flowing out from the outlet 755 of the throttle valve 75 to the sliding portion of the exhaust valve 25 . As described above, the drive oil guided to the sliding portion is used as a friction-reducing lubricant. Furthermore, the outflow line 769 does not necessarily need to guide all the driving oil flowing out of the throttle valve 75 to the sliding portion of the exhaust valve 25 . The outflow line 769 guides at least a part of the driving oil flowing out from the throttle valve 75 to the sliding portion of the exhaust valve 25 .

The monitoring unit 762 is, for example, an ordinary computer. As shown in FIG. 5 , the computer includes a processor 81 , a memory 82 , an input/output unit 83 , and a bus 84 . The bus 84 is a signal circuit that connects the processor 81 , the memory 82 , and the input/output unit 83 . The memory 82 stores programs and various information. The processor 81 executes various processing (for example, numerical calculation or image processing) while using the memory 82 or the like according to a program or the like stored in the memory 82 . The input/output unit 83 is connected to the bus 84 via an interface, and includes a keyboard 85 and a mouse 86 that receive input from the operator, and a display 87 that displays output from the processor 81 and the like.

As shown in FIG. 2 , the monitoring unit 762 includes a storage unit 766 and a detection unit 767 . The storage unit 766 is mainly realized by the memory 82 and stores various kinds of information. The detection unit 767 is mainly realized by the processor 81 , and detects an abnormality of the throttle valve 75 and the throttle valve 75 a described later based on the information stored in the storage unit 766 and the output from the pressure sensor 765 .

Specifically, the storage unit 766 stores in advance, as a "reference variation", the periodic variation in the pressure of the driving oil flowing out from the outlet 755 of the throttle valve 75 when the exhaust valve 25 is operating normally. The reference fluctuation is obtained by measuring the pressure of the driving oil by the pressure sensor 765, for example, in a state where the exhaust valve 25 is confirmed to be in normal operation by a stroke sensor or the like. Alternatively, the reference variation can be obtained by simulation or the like.

FIG. 6 is a diagram showing an example of a reference fluctuation of the drive oil. The horizontal axis in FIG. 6 represents the crank angle (°) of the crank mechanism connected to the piston 3 . The vertical axis in FIG. 6 represents the pressure (bar) of the driving oil flowing out from the outlet 755 of the throttle valve 75 . The graph indicated by reference numeral 90 in FIG. 6 is a reference variation of the pressure of the driving oil. When the crank angle is in the range of 0° to about 120°, the first hydraulic drive line 71 is in a non-pressurized state, and the drive oil flows out from the outlet 755 of the throttle valve 75 in the open state. Therefore, the pressure of the driving oil measured by the pressure sensor 765 is substantially the same as the pressure of the driving oil during non-pressurization, and is relatively low.

When the crank angle becomes about 120°, the first hydraulic drive line 71 is brought into a boosted state, and the throttle valve 75 is shifted from the open state to the closed state. At this time, the boosted driving oil flows out from the outlet 755 of the throttle valve 75 in a short time before the throttle valve 75 is in the closed state. Therefore, when the crank angle is about 120°, the pressure of the driving oil measured by the pressure sensor 765 increases instantaneously, and a peak of the pressure during the reference fluctuation occurs.

In the crank angle range of about 120° to about 240°, the first hydraulic drive line 71 is in a boosted state and the throttle valve 75 is in a closed state, so the pressure of the drive oil measured by the pressure sensor 765 is relatively low. In the crank angle range of about 240° to 360°, the first hydraulic drive line 71 is in a non-boosted state and the throttle valve 75 is in an open state, so the pressure of the drive oil measured by the pressure sensor 765 is relatively low. In addition, the pressure fluctuation of the driving oil in the range of the crank angle of about 300° to 360° is caused by the replenishment of the driving oil and the like, not by the opening and closing of the throttle valve 75 .

In the throttle valve 75 , for example, there is a possibility that a foreign matter is caught between the inner cylindrical portion 752 and the outer cylindrical portion 751 and the inner cylindrical portion 752 cannot be moved. If the inner cylinder portion 752 cannot move when the throttle valve 75 is in the open state, even when the driving oil in the first hydraulic drive line 71 is boosted, the throttle valve 75 is maintained in the open state, and the boosted driving oil continues to flow from The outlet 755 of the throttle valve 75 flows out. Therefore, the pressure of the driving oil measured by the pressure sensor 765 is larger than the reference fluctuation (broken line 90 ) in the crank angle range of about 120° to about 240° as shown by the solid line 91 in FIG. 7 . The measurement value of the pressure sensor 765 is sent to the detection unit 767 . The detection unit 767 detects an abnormality of the throttle valve 75 (in the example shown in FIG. 7 , the throttle valve 75 is normally open) by comparing the measured value of the pressure sensor 765 with the reference fluctuation of the first hydraulic drive line 71 . . In addition, the normally open abnormality of the throttle valve 75 may be caused by, for example, cavitation or the like where the gas in the driving oil accumulates in the interior of the inner cylindrical portion 752 and the like.

In addition, if the inner cylinder portion 752 cannot move when the throttle valve 75 is in the closed state, even when the driving oil in the first hydraulic drive line 71 is not boosted, the throttle valve 75 is maintained in the closed state, and the driving oil does not flow from the The outlet 755 of the throttle valve 75 flows out. Therefore, the pressure of the driving oil measured by the pressure sensor 765 is maintained at a relatively low state regardless of the crank angle, as shown by the solid line 92 in FIG. peak. The detection unit 767 detects an abnormality of the throttle valve 75 (in the example shown in FIG. 8, the throttle valve 75 is normally closed) by comparing the measured value of the pressure sensor 765 with the reference fluctuation.

In addition, the normally closed abnormality of the throttle valve 75 may be caused by, for example, breakage of the elastic member 753 or the like. In addition, when the plurality of orifices 756 of the throttle valve 75 are blocked by foreign matter or the like, the driving oil in the inner cylindrical portion 752 does not flow to the outlet 755 regardless of the position of the inner cylindrical portion 752, so it is considered that the occurrence of The normally closed abnormality of the throttle valve 75 is the same abnormality. In the operation monitoring system 76, when an abnormality of the throttle valve 75 is detected, the detection unit 767 notifies the operator of the detection of the abnormality by, for example, a warning display on the display 87, an alarm sound, or the like.

As described above, the operation monitoring system 76 monitors the operation of the throttle valve 75 provided in the hydraulic drive line (ie, the first hydraulic drive line 71 ) of the diesel engine 1 , which discharges the drive oil. The operation monitoring system 76 includes a throttle valve 75 , a pressure sensor 765 , a storage unit 766 , and a detection unit 767 . The throttle valve 75 has an inlet 754 and an outlet 755 for driving oil. The throttle valve 75 receives the pressure of the driving oil to close the outlet 755 when the driving oil is boosted, and opens the outlet 755 when the driving oil is not boosted. The pressure sensor 765 is arranged near the outlet 755 of the throttle valve 75 . The pressure sensor 765 measures the pressure of the driving oil flowing out from the outlet 755 . The storage unit 766 stores in advance, as a reference variation, the periodic variation of the pressure of the driving oil flowing out from the outlet 755 of the throttle valve 75 when the driving target of the first hydraulic driving line 71 (ie, the exhaust valve 25 ) is operating normally. The detection unit 767 compares the measured value of the pressure sensor 765 with the reference fluctuation, and detects an abnormality of the throttle valve 75 .

Thereby, abnormality of the throttle valve 75 provided in the first hydraulic drive line 71 can be automatically detected. As a result, it is possible to prevent or suppress the abnormal operation of the driven object caused by the abnormality of the throttle valve 75 , so that the malfunction of the diesel engine 1 can be prevented or suppressed.

As described above, the driven object of the first hydraulic drive line 71 preferably includes the exhaust valve 25 of the diesel engine 1 . Thereby, abnormal operation of the exhaust valve 25 which plays an important role in driving the diesel engine 1 can be prevented or suppressed.

As described above, it is preferable that at least a part of the driving oil flowing out from the outlet 755 of the throttle valve 75 is guided to the sliding portion of the exhaust valve 25 and used as lubricating oil. As a result, it is possible to prevent or suppress abnormal lubrication of the sliding portion of the exhaust valve 25 (eg, increase in friction due to lack of lubricating oil) without providing a lubricating oil supply line different from the driving oil. As a result, the configuration of the diesel engine 1 can be simplified.

In the operation monitoring system 76 , it is preferable that the abnormality detected by the detection unit 767 includes the normally open throttle valve 75 . Thereby, it is possible to prevent or suppress insufficient boosting of the first hydraulic drive line 71 due to the normally open throttle valve 75, and as a result, it is possible to prevent or suppress the driving target (ie, the exhaust valve) due to insufficient driving force or the like. 25) is abnormal.

In the operation monitoring system 76 , it is preferable that the abnormality detected by the detection unit 767 includes the normally closed throttle valve 75 . This can prevent or suppress excess gas in the driving oil caused by the normally closed throttle valve 75, and as a result, prevent or suppress abnormal operation of the driven object (ie, the exhaust valve 25) due to cavitation or the like. .

As described above, it is preferable that the operation monitoring system 76 further includes the outflow line 769 for guiding the driving oil flowing out from the outlet 755 of the throttle valve 75 . In addition, it is preferable that the pressure sensor 765 measures the pressure of the driving oil flowing out of the lower part of the pipeline 769 . Thereby, the measuring part of the pressure sensor 765 can be appropriately immersed in the driving oil. As a result, the accuracy of the pressure measurement of the driving oil by the pressure sensor 765 can be improved, and the abnormality of the throttle valve 75 can be detected with high accuracy.

As described above, it is preferable that the operation monitoring system 76 further includes the outflow line 769 for guiding the driving oil flowing out from the outlet 755 of the throttle valve 75 . In addition, it is preferable that the outflow line 769 is provided separately from the drain line through which the drive oil discharged from the portion other than the throttle valve 75 of the first hydraulic drive line 71 flows. As a result, it is possible to prevent or reduce the influence of pressure fluctuations in the driving oil flowing out of the throttle valve 75 , and accurately measure the pressure of the driving oil flowing out of the throttle valve 75 . As a result, abnormality of the throttle valve 75 can be detected with high accuracy.

FIG. 9 is an enlarged cross-sectional view showing the vicinity of the fuel supply pump 62 of the fuel supply mechanism 6 . In FIG. 9, the structure of the 2nd hydraulic drive line 72 is shown together. The fuel supply pump 62 includes a fuel cylinder 621 and a fuel plunger 622 . The second hydraulic drive line 72 includes a pipe 721, a valve 722, a hydraulic cylinder 724, a hydraulic plunger 725, and a throttle valve 75a. The throttle valve 75a has the same structure as the aforementioned throttle valve 75 (see FIGS. 3 and 4 ).

The piping 721 guides the driving oil sent from the driving oil pump 74 (see FIG. 1 ) to the hydraulic cylinder 724 . The valve 722 is provided in the piping 721 and controls the supply of driving oil to the hydraulic cylinder 724 . By opening and closing the valve 722, the state of the driving oil in the second hydraulic drive line 72 is switched between a boosted state and a non-pressurized state. In FIG. 9 , the second hydraulic drive line 72 is shown when the pressure is not boosted.

The hydraulic cylinder 724 is a substantially bottomed cylindrical member. A substantially cylindrical hydraulic plunger 725 is accommodated in the hydraulic cylinder 724 . The fuel cylinder 621 is a substantially cylindrical member. A substantially cylindrical fuel plunger 622 is accommodated inside the fuel cylinder 621 . The fuel cylinder 621 and the fuel plunger 622 are mounted on the upper side of the hydraulic cylinder 724 and the hydraulic plunger 725 . The upper end of the hydraulic plunger 725 is in contact with the lower end surface of the fuel plunger 622 .

The throttle valve 75a is arranged so that the center axis J1 faces a substantially horizontal direction. The inlet 754 of the throttle valve 75a communicates with the inner space of the hydraulic cylinder 724 via a flow path. The flow path is connected to the lower end portion of the inner space of the hydraulic cylinder 724 . The outlet 755 of the throttle valve 75a is connected to the other sensor unit 761a of the operation monitoring system 76 .

The sensor part 761a has the attachment part 764a and the pressure sensor 765a similarly to the said sensor part 761. As shown in FIG. The attachment portion 764 a is attached to the outer side wall of the hydraulic cylinder 724 . A flow path through which the driving oil flowing out of the throttle valve 75a flows is formed inside the mounting portion 764a. The pressure sensor 765a is arranged on the lower side of the flow path of the mounting portion 764a, and continuously measures the pressure of the driving oil flowing in the flow path (that is, the pressure of the driving oil flowing out of the outlet 755 of the throttle valve 75a) at the lower part of the flow path. pressure). The pressure sensor 765a is arranged below the outlet 755 of the throttle valve 75a. The drive oil flowing out of the flow path of the mounting portion 764a is guided to the drain line through the outflow line 769a.

One end portion of the outflow line 769a is connected to the mounting portion 764a. The flow path inside the mounting portion 764a is also considered to be a part of the outflow line 769a. The outflow line 769a is a pipe extending upward from the outside of the hydraulic cylinder 724 to the upper side of the outlet 755 of the throttle valve 75a, and then extending downward. The outflow line 769a is provided independently of the drain line through which the drive oil discharged from the portion other than the throttle valve 75a of the second hydraulic drive line 72 flows.

In the second hydraulic drive line 72 during non-pressurization, the hydraulic plunger 725 and the fuel plunger 622 are not pushed up by the driving oil, and are located inside the fuel cylinder 621 (that is, more than the upper end surface of the fuel plunger 622 ). space on the upper side) temporarily stores fuel. In addition, the throttle valve 75a is in an open state (see FIG. 3 ), and the driving oil in the throttle valve 75a flows out from the outlet 755 to the outside of the second hydraulic driving line 72 together with the gas in the driving oil.

On the other hand, in the second hydraulic drive line 72 at the time of boosting, the throttle valve 75a is in a closed state due to the pressure of the boosted driving oil. In addition, the hydraulic plunger 725 and the fuel plunger 622 are pushed up by the pressure of the boosted driving oil. As a result, the fuel in the fuel cylinder 621 is supplied from the fuel supply pump 62 to the fuel injection portion 61 and injected from the fuel injection portion 61 into the combustion chamber 20 (see FIG. 1 ). In the second hydraulic drive line 72 , when the boosting of the driving oil is completed and the pressure is returned to the non-boosting state, the throttle valve 75 a is opened in the same manner as described above, and a predetermined amount of fuel is supplied into the fuel cylinder 621 . In addition, the hydraulic plunger 725 and the fuel plunger 622 are lowered by their own weight and the pressure of supplying fuel into the fuel cylinder 621 .

In the operation monitoring system 76 , the output from the pressure sensor 765 a is sent to the monitoring unit 762 . In the storage unit 766 of the monitoring unit 762, the periodic fluctuation of the pressure of the driving oil flowing out from the outlet 755 of the throttle valve 75a when the fuel supply pump 62 is normally operated is stored in advance as a "reference fluctuation". The reference fluctuation is the reference fluctuation in the second hydraulic drive line 72 and is different from the reference fluctuation in the first hydraulic drive line 71 . The reference fluctuation of the second hydraulic drive line 72 is obtained, for example, by measuring the pressure of the drive oil with the pressure sensor 765a in a state in which it is confirmed that the fuel supply pump 62 is in normal operation. Alternatively, the reference variation can be obtained by simulation or the like.

During the reference fluctuation, the second hydraulic drive line 72 is in a boosted state, and the boosted drive oil flows out from the outlet 755 of the throttle valve 75a in a short time when the throttle valve 75a transitions from the open state to the closed state. Therefore, the pressure of the driving oil measured by the pressure sensor 765a increases instantaneously, and a pressure peak occurs. Outside the range in which the peak is generated, the pressure of the driving oil during the reference fluctuation is low.

If the normally open abnormality occurs in the throttle valve 75a, when the pressure of the second hydraulic drive line 72 is increased, the boosted driving oil continues to flow out from the outlet 755 of the throttle valve 75a. Therefore, the pressure of the drive oil measured by the pressure sensor 765a fluctuates more than the above-mentioned reference while the drive oil in the second hydraulic drive line 72 is in a pressurized state. The measurement value of the pressure sensor 765 a is sent to the detection unit 767 . The detection unit 767 detects the normally open abnormality of the throttle valve 75a by comparing the measured value of the pressure sensor 765a with the reference fluctuation of the second hydraulic drive line 72 .

In addition, if the normally closed abnormality occurs in the throttle valve 75a, the driving oil does not flow out from the outlet 755 of the throttle valve 75a. Therefore, the pressure of the driving oil measured by the pressure sensor 765a is maintained at a relatively low state regardless of whether the pressure of the second hydraulic drive line 72 is being increased or not. In the detection part 767, the normally closed abnormality of the throttle valve 75a is detected by comparing the measurement value of the pressure sensor 765a with the reference|standard fluctuation of the 2nd hydraulic drive line 72. In the operation monitoring system 76, when an abnormality of the throttle valve 75a is detected, the detection unit 767 notifies the operator of the detection of the abnormality by, for example, a warning display on the display 87, an alarm sound, or the like.

As described above, the operation monitoring system 76 monitors the operation of the throttle valve 75 a provided in the hydraulic drive line (ie, the second hydraulic drive line 72 ) of the diesel engine 1 for exhausting the drive oil. The operation monitoring system 76 includes a throttle valve 75 a , a pressure sensor 765 a , a storage unit 766 , and a detection unit 767 . The throttle valve 75a has an inlet 754 and an outlet 755 for driving oil. The throttle valve 75a receives the pressure of the driving oil to close the outlet 755 when the driving oil is boosted, and opens the outlet 755 when the driving oil is not boosted. The pressure sensor 765a is arranged in the vicinity of the outlet 755 of the throttle valve 75a. The pressure sensor 765a measures the pressure of the driving oil flowing out from the outlet 755 . The storage unit 766 stores in advance the periodic fluctuation of the pressure of the driving oil flowing out from the outlet 755 of the throttle valve 75a when the driving target of the second hydraulic drive line 72 (ie, the fuel supply pump 62) operates normally as a reference fluctuation. The detection unit 767 compares the measured value of the pressure sensor 765a with the reference fluctuation, and detects an abnormality of the throttle valve 75a.

Thereby, the abnormality of the throttle valve 75a provided in the 2nd hydraulic drive line 72 can be detected automatically. As a result, it is possible to prevent or suppress the abnormal operation of the driven object caused by the abnormality of the throttle valve 75a, so that the failure of the diesel engine 1 can be prevented or suppressed.

As described above, the driven object of the second hydraulic drive line 72 preferably includes the fuel supply pump 62 of the diesel engine 1 . As a result, abnormal operation of the fuel supply pump 62 that plays an important role in driving the diesel engine 1 can be prevented or suppressed.

In the operation monitoring system 76, it is preferable that the abnormality detected by the detection unit 767 includes the normally open throttle valve 75a. Thereby, insufficient boosting of the second hydraulic drive line 72 due to the normally open throttle valve 75a can be prevented or suppressed, and as a result, the driving object (ie, the fuel supply pump) can be prevented or suppressed from being driven due to insufficient driving force or the like. 62) The action is abnormal.

In the operation monitoring system 76, it is preferable that the abnormality detected by the detection unit 767 includes the normally closed throttle valve 75a. Thereby, it is possible to prevent or suppress excess gas contained in the driving oil caused by the normally closed throttle valve 75a, and as a result, it is possible to prevent or suppress abnormal operation of the driven object (ie, the fuel supply pump 62) due to cavitation or the like. .

As described above, it is preferable that the operation monitoring system 76 further includes the outflow line 769a for guiding the driving oil flowing out from the outlet 755 of the throttle valve 75a. In addition, it is preferable that the pressure sensor 765a measures the pressure of the drive oil which flows out of the lower part of the piping 769a. Thereby, the measuring part of the pressure sensor 765a can be appropriately immersed in the drive oil. As a result, it is possible to improve the accuracy of the pressure measurement of the driving oil by the pressure sensor 765a, and to detect the abnormality of the throttle valve 75a with high accuracy.

As described above, it is preferable that the operation monitoring system 76 further includes the outflow line 769a for guiding the driving oil flowing out from the outlet 755 of the throttle valve 75a. In addition, it is preferable that the outflow line 769a is provided separately from the drain line through which the drive oil discharged from the portion other than the throttle valve 75a of the second hydraulic drive line 72 flows. Thereby, the influence of the pressure fluctuation of the driving oil which flows out from the throttle valve 75a can be prevented or reduced, and the pressure measurement of the driving oil which flows out from the throttle valve 75a can be performed with high precision. As a result, abnormality of the throttle valve 75a can be detected with high accuracy.

Various changes can be made in the operation monitoring system 76 .

For example, the drive oil flowing out of the throttle valve 75 of the first hydraulic drive line 71 does not necessarily need to be guided to the sliding portion of the exhaust valve 25 and used as lubricating oil.

In the first hydraulic drive line 71, the outflow line 769 independent of the drain line may be omitted, and the drive oil flowing out from the outlet 755 of the throttle valve 75 may be directly introduced into the drain line. Similarly, in the second hydraulic drive line 72, the outflow line 769a independent of the drain line may be omitted, and the drive oil flowing out from the outlet 755 of the throttle valve 75a may be directly introduced into the drain line.

If the pressure sensor 765 is arranged in the vicinity of the outlet 755 of the throttle valve 75, the pressure of the driving oil in the parts other than the lower part of the outflow line 769 (for example, the upper part of the outflow line 769 or the parts other than the outflow line 769) can be measured. . The same applies to the pressure sensor 765a.

The abnormality of the throttle valve 75 and the throttle valve 75a detected by the detection unit 767 may be both of the normally open and the normally closed of the throttle valve 75 and the throttle valve 75a as described above, or any one of them may be used. In addition, the abnormality of the throttle valve 75 and the throttle valve 75a detected by the detection unit 767 is not limited to the normally open and normally closed conditions of the throttle valve 75 and the throttle valve 75a, and may be other various abnormalities.

The throttle valve 75 and the throttle valve 75a are not limited to have the above-described structure, and may have other various structures. For example, a so-called check valve may be used as the throttle valve 75 and the throttle valve 75a.

The throttle valve whose operation is monitored by the operation monitoring system 76 is not necessarily provided on the hydraulic drive line for driving the exhaust valve 25 or the fuel supply pump 62, but may be provided on the hydraulic drive line for driving other driven objects.

The diesel engine 1 provided with the operation monitoring system 76 is not limited to a two-stroke engine, but may be a four-stroke engine. In addition, the operation monitoring system 76 may be installed in various diesel engines provided with the throttle valve, such as a diesel engine for power generation or a diesel engine for automobiles, other than a diesel engine used as a main engine of a ship.

The configurations of the above-described embodiment and each modification can be appropriately combined as long as they do not contradict each other.

The invention has been described and described in detail, but the description is illustrative and not restrictive. Therefore, various modifications and aspects can be made without departing from the scope of the present invention.

Claims (14)

1. an action monitoring system, is the action monitoring system that is arranged on the oil pressure drive pipeline of diesel engine and carries out the action monitoring system of the throttle valve of the exhaust gas of driving oil, it is characterized in that, comprising: The throttle valve has an inlet and an outlet of the driving oil, the outlet is closed by the pressure of the driving oil when the driving oil is boosted, and the outlet is opened when the driving oil is not boosted; a pressure sensor arranged near the outlet of the throttle valve, and measures the pressure of the driving oil flowing out of the outlet; a storage unit that pre-stores, as a reference change, a periodic change in the pressure of the driving oil flowing out of the outlet of the throttle valve when a driven object of the hydraulic drive line operates normally; and A detection unit detects abnormality of the throttle valve by comparing the measured value of the pressure sensor with the reference fluctuation. 2. The motion monitoring system according to claim 1, wherein: The driven object of the hydraulic drive line includes an exhaust valve of a diesel engine. 3. The motion monitoring system according to claim 2, wherein: At least a part of the driving oil flowing out of the outlet of the throttle valve is guided to the sliding portion of the exhaust valve and used as lubricating oil. 4. The motion monitoring system according to claim 2, wherein: The abnormality detected by the detection unit includes the normal opening of the throttle valve. 5. The motion monitoring system according to claim 2, wherein: The abnormality detected by the detection unit includes normally closing of the throttle valve. 6. The motion monitoring system according to claim 2, further comprising: an outflow line that guides the drive oil flowing out of the outlet of the throttle valve, The pressure sensor measures the pressure of the driving oil in the lower part of the outflow line. 7. The motion monitoring system according to claim 1, wherein: The driven object of the hydraulic drive line includes a fuel supply pump of a diesel engine. 8. The motion monitoring system according to claim 7, wherein: The abnormality detected by the detection unit includes the normal opening of the throttle valve. 9. The motion monitoring system according to claim 7, wherein: The abnormality detected by the detection unit includes normally closing of the throttle valve. 10. The motion monitoring system according to claim 7, further comprising: an outflow line that guides the drive oil flowing out of the outlet of the throttle valve, The pressure sensor measures the pressure of the driving oil in the lower part of the outflow line. 11. The motion monitoring system according to claim 1, wherein: The abnormality detected by the detection unit includes the normal opening of the throttle valve. 12. The motion monitoring system according to claim 1, wherein: The abnormality detected by the detection unit includes normally closing of the throttle valve. 13. The motion monitoring system according to claim 1, further comprising: an outflow line that guides the drive oil flowing out of the outlet of the throttle valve, The pressure sensor measures the pressure of the driving oil in the lower part of the outflow line. 14. The motion monitoring system according to any one of claims 1 to 13, further comprising: an outflow line that guides the drive oil flowing out of the outlet of the throttle valve, The outflow line is provided independently of a drain line through which drive oil discharged from a portion other than the throttle valve of the hydraulic drive line flows.

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