JP6266944B2 - Crankshaft vibration control apparatus and method for controlling vibration of internal combustion engine - Google Patents

Description

  The present invention relates to a vibration control device for a crankshaft of an internal combustion engine and a vibration control method thereof, and in particular, even in a system unstable region, the rotational speed of the crankshaft system of the internal combustion engine that is affected by fluctuations in the power load ahead of the system. The present invention relates to a vibration control device for a crankshaft of an internal combustion engine and a method for controlling the vibration, which are prevented from falling into a resonance state close to the resonance speed of the crankshaft.

  A crankshaft system in an internal combustion engine is designed so as to avoid a resonance point based on a natural frequency.

However, in a system unstable region such as overseas, a state where the frequency fluctuates from 48 to 52 Hz often occurs during engine operation, for example, in a 50 Hz zone. As a result, the internal combustion engine is affected, and the rotational speed of the crankshaft system fluctuates, which may approach the resonant rotational speed of the crankshaft.
In that case, if the vibration of the crankshaft is superimposed and the stress generated in the crankshaft increases and excessive stress is repeated, the crankshaft may be broken in the worst case.

  In view of such a situation, when there is a lot of frequency fluctuations in the system, an elastic joint is provided on the flywheel attached to the output side of the crankshaft to reduce excessive stress on the crankshaft. Yes.

  Also, during the test run, measure the shaft system frequency to check if there is any resonance effect within the operating range. If there is a resonance effect, install it on the tip of the crankshaft when the engine is stopped. Excessive stress generated in the crankshaft is reduced by adjusting the tuning wheel Tw and the flywheel Fw on the crankshaft output shaft side. However, such adjustments can only be made during engine commissioning.

  Incidentally, Patent Document 1 discloses a technique for reducing the following vibration. In this patent document 1, in an internal combustion engine having an excitation device capable of adjusting the excitation torque applied to the crankshaft, the excitation torque generated by the excitation device is detected, and the vibration acceleration of the internal combustion engine power train is detected. Are detected, and the calculation means calculates a transfer function between the excitation torque generated by the vibration generator and the vibration acceleration of the internal combustion engine power train from these detected values. Based on this transfer function, the control means controls the excitation torque of the excitation device so as to reduce the internal combustion engine roll vibration.

Further, with respect to the shaft system power transmission device of an internal combustion engine, there is a method based on how to grasp absolute attenuation and relative attenuation inside the internal combustion engine in order to achieve proper operation and efficient operation.
However, since this method is a trial and error based on experience and experience, there is a tendency to lower the absolute attenuation and relative attenuation and increase the amplitude and stress in the estimation calculation (safe side). is there. Therefore, it is not possible to bring in the viewpoint of limit design, and there is a situation in which an excessive margin rate is forced in a new design or a new analysis.

For this reason, the present applicant has improved the accuracy of calculating the absolute damping and relative damping energy of the internal combustion engine described above in Patent Document 2 so as to match the actual internal combustion engine (to better match the actual engine operation result). The following proposals have been made as issues.
That is, Patent Document 2 is a vibration control device in a crankshaft system of an internal combustion engine that connects an internal combustion engine and a driven device, and models the internal combustion engine to the driven device as an inertial mass / spring system, Calculate the total damping energy, which is the excitation energy, from the measured damping ratio and the calculated mode mass at the resonance point balance of each natural mode and natural frequency where the damping energy is balanced. Expressed as the sum of damping energy, relative damping energy, and damping energy of driven equipment and accessories on the shaft system, engine absolute damping coefficient that evaluates the absolute damping energy on the engine side and engine absolute that evaluates the relative damping energy on the engine side By creating a plurality of equations related to the damping coefficient from a plurality of resonance point measurement results and solving the plurality of simultaneous equations, We have proposed a method of obtaining the related absolute attenuation coefficient and the engine relative damping coefficient.

JP-A-11-117989 JP 2009-229445 A

However, neither of Patent Documents 1 and 2 is configured such that the crankshaft in the internal combustion engine can avoid the resonance point even in the unstable system region.
The present invention has been proposed in order to overcome such a problem, and even in a system unstable region, a flywheel or a tuning wheel provided on a crankshaft is used. To provide a crankshaft vibration control device for an internal combustion engine and a method for controlling the vibration of the internal combustion engine by adjusting the rotation weight applied to the rotation by cooling water or the like so that the rotation speed of the crankshaft can be shifted from the resonance rotation speed. With the goal.

In order to solve the above-mentioned problem, the present invention according to claim 1 is a crankshaft vibration control device for controlling a vibration state of a crankshaft for converting a reciprocating motion of an internal combustion engine into a rotational motion, the rotation of the crankshaft. Rotational speed detection means for detecting the number, a wheel member provided coaxially with the crankshaft , a storage space provided inside the wheel member and having a certain capacity capable of storing mass-added liquid, and mass addition to the storage space A mass-added liquid supply means for supplying a liquid; and a control means for controlling the supply of the mass-added liquid by the mass-added liquid supply means , wherein the control means includes the rotation speed detected by the rotation speed detection means and the crank. When the deviation from the resonance rotational speed of the shaft becomes less than a predetermined threshold, the mass addition liquid supply means causes the mass addition liquid to be placed in the storage space along the axis of the crankshaft. Characterized by being configured to control supply through the supply passage.

  As a result, the wheel member provided coaxially with the crankshaft is used, and the mass-added liquid is supplied and controlled to the storage space of the wheel member under system fluctuations, thereby adjusting the rotational weight of the rotation. Can be shifted from the resonance rotational speed.

  According to a second aspect of the present invention, when the deviation between the rotational speed detected by the rotational speed detection means and the resonance rotational speed of the crankshaft is less than a predetermined threshold, the control means is a mass-added liquid supply means. Thus, the mass-added liquid is controlled to be supplied to the storage space through the supply path along the axis of the crankshaft.

  When the rotational speed of the crankshaft is detected by the rotational speed detection means, and the deviation of the rotational speed from the resonant rotational speed of the crankshaft is less than a predetermined threshold, The supply control of the mass-added liquid can prevent the crankshaft system from reaching the resonance point.

  According to a third aspect of the present invention, the wheel member is at least one of a flywheel and a tuning wheel provided on the crankshaft.

  As a result, the mass-added liquid is stored in the flywheel or tuning wheel provided on the crankshaft, and the rotational weight as a rotating element accompanied by the rotation is adjusted together with the crankshaft. Can be prevented.

  According to a fourth aspect of the present invention, the storage space is formed so as to be axially symmetric with respect to the crankshaft.

  Thereby, smoothing of rotation of a crankshaft system is accelerated | stimulated by forming the storage space which stores a mass addition liquid symmetrically with respect to a crankshaft.

  Moreover, in this invention of Claim 5, a mass addition liquid is the cooling water used for an internal combustion engine, and it is comprised so that a storage space may be connected to the cooling water path along the axial center of a crankshaft. It is characterized by that.

  As a result, the cooling water is supplied to the storage space through the cooling water passage that passes through the axis of the crankshaft in the internal combustion engine, so that the rotational weight of the crankshaft system can be adjusted. There is no need to provide liquid supply means.

  In the present invention described in claim 6, the mass-added liquid is lubricating oil used in an internal combustion engine, and is configured such that a storage space communicates with a lubricating oil passage along the axis of the crankshaft. It is characterized by that.

  As a result, the rotational weight of the crankshaft system can be adjusted by supplying the lubricating oil to the storage space through the lubricating oil passage that passes through the axis of the crankshaft in the internal combustion engine. There is no need to provide liquid supply means.

  According to a seventh aspect of the present invention, there is provided a crankshaft vibration control method in the crankshaft vibration control apparatus for an internal combustion engine according to the first aspect, wherein the first step of detecting the rotational speed of the crankshaft; A second step of comparing the rotation speed of the crankshaft detected in the first step with the resonance rotation speed of the crankshaft to determine whether the deviation between the rotation speed and the resonance rotation speed is less than a predetermined threshold value; If the deviation is not less than the predetermined threshold, a third step for maintaining the operation, a fourth step for operating the mass addition liquid supply means when the deviation is less than the predetermined threshold, and adding mass to the storage space. And a fifth step of controlling the supply of liquid through a supply path along the axis of the crankshaft.

  Thereby, the rotation speed of the crankshaft is detected, and when the deviation between the rotation speed of the crankshaft and the resonance rotation speed of the crankshaft becomes less than a predetermined threshold, the mass-added liquid is supplied and controlled to the storage space. The rotational speed of the crankshaft can be prevented from becoming the resonant rotational speed.

  Further, the present invention according to claim 8 is a crankshaft vibration control method in the crankshaft vibration control apparatus for an internal combustion engine according to claim 1, wherein the first step of detecting the amplitude of the crankshaft, A second step for determining whether or not the amplitude detected in one step has reached a predetermined value associated with the resonance phenomenon; and if the amplitude has reached a predetermined value, the mass-added liquid supply means is determined to be in a resonance state. And a third step of actuating.

  Thereby, the rotation speed of the crankshaft can be shifted from the resonance rotation speed, the resonance state can be avoided, and unexpected situations such as breakage of the crankshaft can be prevented.

  According to the present invention, when the rotation speed of the crankshaft is detected and the deviation of the rotation speed from the resonance rotation speed of the crankshaft is less than a predetermined threshold, the mass addition liquid supply means adds mass to the storage space. By controlling the supply of liquid through a supply path along the axis of the crankshaft, the rotational speed of the crankshaft can be prevented from becoming the resonant rotational speed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an example of a crankshaft of an internal combustion engine and a drive shaft of a power generator connected coaxially to the crankshaft when implementing a vibration control device for a crankshaft of an internal combustion engine according to the present invention. It is a side view which shows an example of the flywheel provided in the crankshaft shown in FIG. 1, and the storage space is formed so that it may become axisymmetric with respect to a crankshaft. It is a systematic diagram which shows an example of the cooling water supply system | strain concerning the mass addition liquid supply means of this invention. It is a systematic diagram which shows an example of the lubricating oil supply system concerning the mass addition liquid supply means of this invention. It is a schematic block diagram of a vibration control apparatus. It is the flowchart which showed one procedure which supplies a mass addition liquid to a wheel part and adjusts a rotation weight by the control means which controls the drive state of the mass addition liquid supply means concerning this invention. It is the flowchart which showed another procedure which adjusts rotation weight by supplying a mass addition liquid to a wheel part by the control means which controls the drive state of the mass addition liquid supply means concerning this invention.

  The present invention will be described below with reference to the drawings. However, the configuration, dimensions, material, shape, relative arrangement, and the like of the parts described as the embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely explanations. It is just an example.

FIG. 1 illustrates a power generator 2 driven by an internal combustion engine 1 when implementing a vibration control device for a crankshaft of an internal combustion engine according to the present invention.
That is, as shown in FIG. 1, the drive shaft 4 of the power generator 2 is coaxially connected to the output end of the crankshaft 3 of the internal combustion engine 1.
The crankshaft 3 converts a reciprocating motion through a connecting rod (hereinafter referred to as a connecting rod, described later) into a rotational motion from a motion of a piston (described later) that reciprocates in a cylinder (described later) in the internal combustion engine 1. The crank pin 6 between the pair of crank arms 5 and 5 is configured to convert the reciprocating motion into the rotational motion from the nine cylinders and pistons provided corresponding to the axis of the crank shaft 3 through the connecting rod. Connecting rods are connected. Each crank receiving portion formed by a pair of crank arms 5, 5 and a crank pin 6 connecting the crank arms 5, 5 is connected in a straight line by a crank journal 7.

  The crank arm 5 is elongated in a direction orthogonal to the axis of the crankshaft 3, and a crank journal 7 is coupled to the center of the crank arm 5. With the crank journal 7 at the center of the crank arm 5 sandwiched therebetween, the crank pin 6 is positioned near one end of the crank arm 5 on the long side, and the inertia force generated by the vibration of the piston and connecting rod is located near the other end of the crank arm 5. It has a function of balance weight to reduce the weight.

  In the drawing of the crankshaft 3, a tuning wheel 10 as a wheel member is provided on the left end side, and a flywheel 20 having a diameter larger than that of the tuning wheel 10 is provided on the right end side.

  The drive shaft 4 of the power generator 2 connected to the output end of the crankshaft 3 is provided with a wheel for transmitting power to a blower, a generator, an exciter, etc., and a balance wheel bw, which will not be described in detail. It is done.

Then, the tuning wheel 10 and the flywheel 20 provided on the crankshaft 3 will be described.
As is well known, the tuning wheel 10 is provided to reduce the twisting phenomenon of the shaft. As will be described later, the tuning wheel 10 is configured in the same manner as the flywheel 20 of the present invention and is similar to the flywheel 20. The function can also be demonstrated.

Therefore, the flywheel 20 will be described.
The flywheel 20 is provided coaxially with the crankshaft 3, and a storage space 20s capable of storing a mass-added liquid (described later) is provided therein (see FIGS. 1 and 2).
Here, four storage spaces 20s are formed so as to be symmetrical with respect to the crankshaft 3 provided coaxially. Of course, the number is not limited to four, and two or six are possible. By forming the storage space 20s symmetrically with respect to the crankshaft 3, rotation of the crankshaft system is facilitated. These storage spaces 20 s communicate with a passage r of a mass-added liquid (described later) formed along the axis of the crankshaft 13 (see FIG. 2).

Next, as the mass-added liquid that is supplied and controlled to the storage space 20 s of the flywheel 20, for example, cooling water used in the internal combustion engine 1 can be used. In this case, as the mass-added liquid supply means for supplying the cooling water, a piping path for cooling each mechanical component which is a heat generating part constituting the internal combustion engine 1, that is, a cooling water supply system shown in FIG. 3 can be used. FIG. 3 shows a cooling water supply system used in the internal combustion engine 1 in which five cylinders are arranged in parallel.
In the internal combustion engine 1 shown schematically and schematically in FIG. 3, the crankshaft 3 is disposed on the mechanism frame 11 so as to extend in the left-right X direction in the drawing.
On the mechanism frame 11, two rows of cylinder portions 12 are provided in parallel to the axial direction of the crankshaft 3. Each cylinder portion 12 is provided with a cylinder 12s. Each cylinder 12s is provided with a cylinder liner 121 and a cylinder cover 12c.

As such a cooling water system for the internal combustion engine, a cooling water supply path Lin and a cooling water discharge path Lout are formed.
The cooling water supply path Lin is branched to correspond to two rows of cylinder portions 12 arranged in parallel to the axial direction of the crankshaft 3 with the crankshaft 3 interposed therebetween, and the cylinder liner 12l of each cylinder 12s from the mechanism frame 11 is formed. And the cooling water discharge path Lout formed along the central axis of the crankshaft 3, for example.
That is, the cooling water discharge path Lout is normally discharged through the mechanism frame 11 via the cooling water discharge path Lout formed along the central axis of the crankshaft 3.
Then, from the cooling water discharge path Lout formed along the central axis of the crankshaft 3 to the storage space 20 s of the flywheel 20 via the supply passage r along the central axis of the crankshaft 3 by a control means described later. Supply control can be performed so that cooling water is supplied.

Further, as the mass-added liquid that is supplied and controlled to the storage space 20s of the flywheel 20, for example, lubricating oil used in the internal combustion engine 1 is also possible (see FIG. 4). In this case, the lubricating oil system shown in FIG. 4 can be used as the mass-added liquid supply means for supplying the lubricating oil.
In this case, the lubricating oil system has a lubricating oil supply path Oin introduced into the crankshaft 3 via the mechanism frame 11. Such a lubricating oil system passes, for example, the crank journal 7 on the crankshaft 3, and the lubricating oil is provided to the connecting rod cr and the piston pin pp of the piston p via the crank pin 6 between the pair of crank arms 5. It is like that.
The storage space 20 s of the flywheel 20 communicates with the lubricating oil passage Or along the axis of the crankshaft 3. The storage space 20 s of the flywheel 20 will be described later from the lubricating oil passage Or of the crankshaft 3. The supply control can be performed so that the lubricating oil is supplied by the control means.

Next, the vibration control device for the crankshaft 3 of the internal combustion engine 1 will be described.
Such a vibration control device controls the vibration state of the crankshaft 3, and includes a rotation speed detection means 30 that detects the rotation speed of the crankshaft 3 and a cooling water supply system or a lubricating oil supply system. Or the control means 40 which controls supply of lubricating oil is comprised (refer FIG. 5).
For example, a gap sensor can be used as the rotation speed detection means 30. By using such a gap sensor, it is possible to detect the rotation speed or the vibration value. That is, the rotational speed can be detected by detecting the cut of the crankshaft 3. The vibration value can be detected by collecting axial and radial displacements of the crankshaft 3.

Then, in the control means 40, here, when the deviation between the rotational speed detected by the rotational speed detection means 30 and the resonance rotational speed of the crankshaft 3 is less than a predetermined threshold value α, the cooling water supply system or the lubricating oil The supply system controls supply of cooling water or lubricating oil to the storage space 20 s of the flywheel 20 through a supply path along the axis of the crankshaft 3.
Note that the predetermined threshold value α is set such that, for example, the detected rotational speed is a rotational speed that deviates from a region where the vibration level at the resonant rotational speed rises sharply.

Therefore, the specific procedure of the control means 40 will be described based on the flowcharts shown in FIGS. Here, an example of controlling supply of lubricating oil using a lubricating oil supply system as mass addition liquid supply means will be described.
First, when the operation of the internal combustion engine 1 is started, the reciprocating motion by the piston is converted into rotational motion in the crankshaft 3, the crankshaft 3 rotates, the drive shaft 4 of the power generator 2 rotates, and the power generator 2 It can generate electricity.

When the crankshaft 3 rotates, in FIG. 6, the rotation speed detection means 30 detects the rotation speed of the crankshaft 3 (first step S1). In this case, the rotational speed can be detected by detecting the incision of the crankshaft 3 by using a gap sensor for the rotational speed detection means 30.
Next, the rotation speed of the crankshaft 3 detected in the first step S1 is compared with the resonance rotation speed of the crankshaft 3, and the deviation between the detected rotation speed of the crankshaft 3 and the resonance rotation speed of the crankshaft 3 is compared. Is less than a predetermined threshold value α (second step S2).
If the deviation is not less than the predetermined threshold value α, the operation is maintained as it is (third step S3). If the deviation is less than the predetermined threshold value α, the control means 40 is placed in the storage space 20s of the flywheel 20. The supply of the lubricating oil is controlled through a supply path along the axis of the crankshaft 3.

  That is, the rotational speed of the crankshaft 3 is detected, and when the deviation between the rotational speed of the crankshaft 3 and the resonant rotational speed of the crankshaft 3 is less than a predetermined threshold value α, the hydraulic pump is controlled (fourth step). S4) Since the lubricating oil is supplied and controlled to the storage space 20s of the flywheel 20 (fifth step S5), it is possible to prevent the rotational speed of the crankshaft 3 from becoming the resonant rotational speed.

The control means 40 can also be executed according to the procedure shown in FIG. That is, here, the amplitude is detected from the vibration value obtained by collecting the axial and radial displacements of the crankshaft 3 (first step S1).
Next, it is determined whether or not the amplitude has reached a predetermined value, that is, the amplitude associated with the resonance phenomenon (second step S2).
If the amplitude reaches a predetermined value, it is determined that a resonance phenomenon has occurred, the hydraulic pump is controlled (third step S3), and the lubricating oil is supplied to the storage space 20s of the flywheel 20 and controlled.
Thereby, the rotation speed of the crankshaft 3 can be shifted from the resonance rotation speed, the resonance state can be avoided, and unexpected situations such as breakage of the crankshaft 3 can be prevented.

  The present invention relates to a driven device other than a generator device coaxially connected to a crankshaft in a large-sized stationary engine, for example, having a plurality of cylinders and a crankshaft having a corresponding length. Also, it can be suitably applied.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Electric power generating device 3 Crankshaft 4 Drive shaft 5 Crank arm 6 Crankpin 7 Crank journal 10 Tuning wheel 20 Flywheel 20s Storage space 30 Rotation number detection means 40 Control means

Claims (9)

A crankshaft vibration control device for controlling a vibration state of a crankshaft for converting a reciprocating motion of an internal combustion engine into a rotational motion,
A rotational speed detection means for detecting the rotational speed of the crankshaft;
A wheel member provided coaxially with the crankshaft;
A storage space provided inside the wheel member and having a certain capacity capable of storing the mass-added liquid; and
A mass addition liquid supply means for supplying the mass addition liquid to the storage space;
Control means for controlling the supply of the mass addition liquid by the mass addition liquid supply means ,
When the deviation between the rotational speed detected by the rotational speed detection means and the resonance rotational speed of the crankshaft is less than a predetermined threshold, the control means causes the mass-added liquid supply means to add the storage space to the storage space. A crankshaft vibration control apparatus for an internal combustion engine, characterized in that the mass-added liquid is supplied and controlled through a supply path along the axis of the crankshaft.   The vibration control device for a crankshaft of an internal combustion engine according to claim 1, wherein the wheel member is at least one of a flywheel and a tuning wheel provided on the crankshaft. 3. The vibration control device for a crankshaft of an internal combustion engine according to claim 1, wherein the storage space is formed so as to be axially symmetric with respect to the crankshaft. The mass-added liquid is cooling water used in an internal combustion engine, and is configured so that the storage space communicates with a cooling water passage along an axis of the crankshaft. 4. The vibration control device for a crankshaft of an internal combustion engine according to claim 1 . The mass-added liquid is lubricating oil used in an internal combustion engine, and is configured so that the storage space communicates with a lubricating oil passage along an axis of the crankshaft. 4. The vibration control device for a crankshaft of an internal combustion engine according to claim 1 .   The crankshaft vibration control device for an internal combustion engine according to any one of claims 1 to 5, wherein the mass-added liquid is supplied from the internal combustion engine to the storage space.   A crankshaft vibration control device for controlling a vibration state of a crankshaft for converting a reciprocating motion of an internal combustion engine into a rotational motion,
  A rotational speed detection means for detecting the rotational speed of the crankshaft;
  A wheel member provided coaxially with the crankshaft;
  A storage space provided inside the wheel member and capable of storing the mass-added liquid;
  Mass-added liquid supply means for supplying the mass-added liquid to the storage space via a supply passage formed along the storage space and the central axis of the crankshaft and communicating with the cooling water discharge path of the internal combustion engine; ,
  And a control means for controlling the supply of the mass-added liquid by the mass-added liquid supply means. A crankshaft vibration control method in a crankshaft vibration control apparatus for an internal combustion engine according to any one of claims 1 to 7 ,
A first step of detecting the rotational speed of the crankshaft;
The crankshaft rotation speed detected in the first step is compared with the crankshaft resonance rotation speed to determine whether or not the deviation between the rotation speed and the resonance rotation speed is less than a predetermined threshold value. A second step;
A third step of maintaining driving if the deviation is not less than a predetermined threshold;
A fourth step of operating the mass-added liquid supply means when the deviation is less than a predetermined threshold;
A fifth step of controlling supply of the mass-added liquid to the storage space through a supply path along the axis of the crankshaft;
A vibration control method for a crankshaft system of an internal combustion engine, comprising: A crankshaft vibration control method in a crankshaft vibration control apparatus for an internal combustion engine according to any one of claims 1 to 7 ,
A first step of detecting an amplitude of the crankshaft;
A second step of determining whether the amplitude detected in the first step has reached a predetermined value associated with a resonance phenomenon;
If the amplitude has reached a predetermined value, a third step of operating the mass-added liquid supply means as being in a resonance state;
A vibration control method for a crankshaft system of an internal combustion engine, comprising:

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