CN114993644A - Failure judgment method, device, equipment and medium for crankshaft torsional vibration damper - Google Patents
Failure judgment method, device, equipment and medium for crankshaft torsional vibration damper Download PDFInfo
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Abstract
The application provides a failure judgment method, a failure judgment device, failure judgment equipment and a failure judgment medium for a crankshaft torsional vibration damper of an internal combustion engine. The method comprises the following steps: the difference value of the first instantaneous rotating speed and the second instantaneous rotating speed is processed by acquiring the first instantaneous rotating speed of the inner gear ring and the second instantaneous rotating speed of the outer gear ring which are installed on the crankshaft, and the instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring is obtained. And calculating the average rotating speed of the inner gear ring according to the first instant rotating speed, and performing difference processing on the average rotating speed and the first instant rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring. And then judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value. According to the method and the device, the mode of judging whether the crankshaft torsional vibration damper fails or not is effectively reduced, dependence on experience of a technician is effectively reduced, and the judgment result is more accurate.
Description
Technical Field
The application relates to the technical field of internal combustion engines, in particular to a failure judgment method, a failure judgment device, failure judgment equipment and failure judgment media for a crankshaft torsional vibration damper of an internal combustion engine.
Background
The crankshaft is one of the important moving parts of the internal combustion engine, and when the internal combustion engine is in operation, periodic relative torsion, called torsional vibration for short, occurs between the crank throws under the periodically changing torque of the crankshaft. The larger the torsional vibration amplitude of the crankshaft, the more severe the wear of the transmission mechanism and even the breakage of the crankshaft. In order to reduce the torsional vibration of the crankshaft, a torsional vibration damper is mounted at the front end of the crankshaft having the largest torsional amplitude, so that the torsional vibration energy of the crankshaft is gradually dissipated into the friction in the damper, and the amplitude is gradually reduced.
Since the torsional vibration damper is not easy to detect the failure, the torsional vibration of the crankshaft can not consume the torsional vibration energy of the crankshaft when the torsional vibration damper fails, so that other parts are seriously damaged by the torsional vibration of the crankshaft, and therefore the failure of the torsional vibration damper of the crankshaft needs to be detected. In the prior art, a crankshaft torsional vibration damper takes a steel plate spring damper, which is called a leaf spring damper for short, as an example, and a technician observes that the surface of the leaf spring damper has damage and deformation without damage, or judges whether the leaf spring damper fails according to abnormal sound when an internal combustion engine is started.
However, the failure judgment result of the crankshaft torsional vibration damper in the prior art is not accurate enough and has low accuracy.
Disclosure of Invention
The application provides a failure judgment method, a failure judgment device, failure judgment equipment and a failure judgment medium for a crankshaft torsional vibration damper of an internal combustion engine, and aims to solve the problem that the failure judgment result of the crankshaft torsional vibration damper in the prior art is not accurate enough.
In a first aspect, the present application provides a method for determining failure of a crankshaft torsional vibration damper, comprising:
acquiring a first instantaneous rotating speed of an inner gear ring installed on a crankshaft and a second instantaneous rotating speed of an outer gear ring;
performing difference processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring;
calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed;
performing difference processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring;
and judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
Optionally, the determining whether the crankshaft torsional vibration damper fails according to the relationship between the instantaneous speed fluctuation difference and a preset first limit value and the relationship between the crankshaft torsional vibration value and a preset second limit value includes:
if the instantaneous speed fluctuation difference value is larger than the preset first limit value and the crankshaft torsional vibration value is larger than the preset second limit value, the crankshaft torsional vibration damper is invalid;
or if the instantaneous speed fluctuation difference value is greater than the preset first limit value and the crankshaft torsional vibration value is less than or equal to the preset second limit value, the crankshaft torsional vibration damper fails.
Optionally, if the crankshaft torsional vibration damper is judged to be out of work, the fault alarm prompt information of the crankshaft torsional vibration damper is output.
Optionally, the method further includes:
and judging whether the crankshaft system has a fault or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
Optionally, the determining whether the crankshaft shaft system fails according to the relationship between the instantaneous speed fluctuation difference and a preset first limit value and the relationship between the crankshaft torsional vibration value and a preset second limit value includes:
and if the instantaneous speed fluctuation difference value is less than or equal to the preset first limit value and the crankshaft torsional vibration value is greater than the preset second limit value, the crankshaft system fails.
Optionally, if the crankshaft system is judged to have a fault, a crankshaft system fault alarm prompt message is output.
Optionally, the method further includes:
and if the instantaneous speed fluctuation difference value is smaller than or equal to the preset first limit value and the crankshaft torsional vibration value is smaller than or equal to the preset second limit value, the crankshaft torsional vibration damper and the crankshaft shaft system are normal.
In a second aspect, the present application provides a crankshaft torsional vibration damper failure determination apparatus, comprising:
the acquisition module is used for acquiring a first instantaneous rotating speed of an inner gear ring arranged on the crankshaft and a second instantaneous rotating speed of an outer gear ring;
the difference processing module is used for performing difference processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring;
the calculation module is used for calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed;
the difference processing module is further used for carrying out difference processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring;
and the judging module is used for judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
In a third aspect, the present application provides a failure determination device for a crankshaft torsional vibration damper, comprising: the system comprises at least two rotation speed sensors, a processor and a memory, wherein the memory is in communication connection with the processor;
the rotating speed sensor is used for acquiring a first instantaneous rotating speed of an inner gear ring arranged on the crankshaft and a second instantaneous rotating speed of an outer gear ring;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of the first aspects.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement the method of any one of the first aspect.
In a fifth aspect, the present application provides a computer program product comprising a computer program that, when executed by a processor, implements the method of any of the first aspects.
According to the failure judgment method, the failure judgment device, the failure judgment equipment and the failure judgment medium for the crankshaft torsional vibration damper, the first instantaneous rotating speed of the inner gear ring and the second instantaneous rotating speed of the outer gear ring which are installed on the crankshaft are obtained, difference processing is carried out on the first instantaneous rotating speed and the second instantaneous rotating speed, and the instantaneous speed fluctuation difference of the inner gear ring and the outer gear ring is obtained. And meanwhile, calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed, and performing difference processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring. And then judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value. The method and the device reduce dependence on experience of technicians, and the result of judging whether the crankshaft torsional vibration damper fails according to the instantaneous speed fluctuation difference value and the crankshaft torsional vibration value is more accurate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic structural view of a crankshaft torsional vibration damper provided herein;
fig. 2 is a schematic flowchart of a failure determination method for a crankshaft torsional vibration damper according to an embodiment of the present disclosure;
FIG. 3 is a diagram of a theoretical model applicable to the present application;
FIG. 4 is a test curve of the instantaneous speed fluctuation difference under different working conditions according to the present application;
fig. 5 is a schematic flowchart of a method for determining a torsional oscillation overrun of a crankshaft according to a third embodiment of the present application;
fig. 6 is a schematic structural diagram of a failure determination device for a crankshaft torsional vibration damper according to a fourth embodiment of the present application;
fig. 7 is a schematic structural diagram of a failure determination apparatus for a crankshaft torsional vibration damper according to a fifth embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
When the engine works, the phenomenon that the crankshafts generate periodic relative torsion among the crank throws under the action of the periodically changed torque is called torsional vibration, and the phenomenon is called torsional vibration for short. For torsional vibration, because the crankshaft is long, the torsional rigidity is small, and the rotational inertia of the crankshaft shafting is large, the frequency of the torsional vibration of the crankshaft is low, and resonance is easy to generate when the crankshaft works in the range of the working rotating speed of the internal combustion engine, or the resonance can also occur when the change frequency of the engine torque is the same as or integral multiple of the natural frequency of the crankshaft torsion. The torsional amplitude is increased during resonance, so that the abrasion of a transmission mechanism is aggravated, the power of an engine is reduced, and even a crankshaft is broken when the power is severe.
The strength and reliability of the crankshaft, which is one of the major moving parts of the internal combustion engine, largely determines the reliability of the internal combustion engine. In order to reduce the torsional vibration of the crankshaft, a torsional vibration damper is installed at the front end of the crankshaft where the torsional vibration is largest, and the torsional vibration energy of the crankshaft is gradually dissipated into friction in the damper, so that the amplitude is gradually reduced. Because the failure of the crankshaft torsional vibration damper is not easy to be perceived, the torsional vibration has great influence on other parts and parts when the crankshaft torsional vibration damper fails, and therefore the failure of the crankshaft torsional vibration damper needs to be detected.
The crankshaft torsional vibration damper comprises a silicon oil damper, a plate spring damper and the like, wherein the crankshaft torsional vibration damper is described by taking a steel plate spring damper, namely the plate spring damper for short as an example. Or if obvious abnormal sound exists when the internal combustion engine is started, judging that the plate spring shock absorber fails.
However, in the prior art, whether the surface of the plate spring shock absorber is observed to have damage and deformation, or whether abnormal sound is heard when the internal combustion engine is started, whether the crankshaft torsional shock absorber fails or not is judged by the working experience of a technician, so that the result of judging the failure of the crankshaft torsional shock absorber is not accurate enough.
Therefore, in order to solve the above technical problems in the prior art, the present application provides a failure determination method, device, apparatus and medium for a crankshaft torsional vibration damper of an internal combustion engine. The instantaneous rotating speed of the inner gear ring and the instantaneous rotating speed of the outer gear ring which are arranged on the crankshaft are obtained through the rotating speed sensor, and the instantaneous speed fluctuation difference value is obtained according to the instantaneous rotating speeds of the inner gear ring and the outer gear ring. And calculating the average rotating speed according to the instantaneous rotating speed of the inner gear ring so as to obtain the crankshaft torsional vibration value of the inner gear ring. And finally, judging whether the crankshaft torsional vibration damper fails or not according to the instantaneous speed fluctuation difference value and the overrun condition of the crankshaft torsional vibration value. The result of judging whether the crankshaft torsional vibration damper fails or not according to the instantaneous speed fluctuation difference value and the crankshaft torsional vibration value is more accurate.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
In the present application, a plate spring damper is taken as an example of a crankshaft torsional vibration damper, and the related components and the installation positions thereof according to the present application will be first described below, and fig. 1 is a schematic structural view of a crankshaft torsional vibration damper according to the present application, as shown in fig. 1.
The plate spring vibration absorber 101 is fixedly arranged at the front end of the crankshaft 102, and the outer gear ring 103 is fixedly arranged on the plate spring vibration absorber 101 through mounting bolts 104, wherein the number of the mounting bolts 104 is not limited but is uniformly distributed, and if the mounting bolts are not uniformly distributed, the problem of dynamic unbalance is easy to occur. An inner gear ring 105 is fixedly arranged at the front end of the crankshaft 2, a damper shell 106 is arranged on an engine body through a fixing bolt 107 and plays a role in damping vibration, rotation speed sensors 108 and 109 are arranged on the damper shell 106, the rotation speed sensor 108 faces the outer gear ring 103 and is used for measuring the instantaneous rotation speed of the outer gear ring 103, and the rotation speed sensor 109 faces the inner gear ring 105 and is used for measuring the instantaneous rotation speed of the inner gear ring 105.
Fig. 2 is a schematic flowchart of a failure determination method for a crankshaft torsional vibration damper according to an embodiment of the present application. The execution subject of the method may be equipment for judging the failure of the crankshaft torsional vibration damper, for example, the equipment may be an independent server or a server cluster composed of a plurality of servers. The method in this embodiment may be implemented by software, hardware, or a combination of software and hardware. As shown in fig. 2, the method may include the steps of:
s201, acquiring a first instantaneous rotating speed of an inner gear ring installed on a crankshaft and a second instantaneous rotating speed of an outer gear ring.
The gear ring is also called a fluted disc, is a disc with teeth and is arranged at the end part of the crankshaft, and is divided into an inner gear ring and an outer gear ring in the application, and the installation position and the structure of the gear ring are shown in figure 1. The number of teeth of the inner gear ring and the outer gear ring can be increased, the number of teeth in a certain range is increased, and the accuracy of the tested instantaneous rotating speed is higher. For example, the number of teeth may be greater than or equal to 60, and the specific number of teeth may be set according to the test requirements, and the number of teeth is not limited in the present application.
The first instantaneous rotational speed of the inner ring gear is measured by the rotational speed sensor 109 in fig. 1, and the second instantaneous rotational speed of the outer ring gear is measured by the rotational speed sensor 108. Specifically, the rotating speed sensor generates a pulse signal once when the gear ring rotates by one tooth, and the instantaneous rotating speeds of the inner gear ring and the outer gear ring are calculated through the pulse signal.
For example, assuming that the ring gear has 60 teeth and the crankshaft rotates by 1/60r for every tooth, the first instantaneous rotational speed of the ring gear is calculated to be 100r/min assuming that the time for generating a pulse signal is 0.01 s. Therefore, 60 first instantaneous rotation speeds of the ring gear can be calculated every time the crankshaft rotates once. Accordingly, the above-described calculation method is also used to calculate the second instantaneous rotational speed of the outer ring gear.
S202, difference processing is carried out on the first instantaneous rotating speed and the second instantaneous rotating speed, and the instantaneous speed fluctuation difference of the inner gear ring and the outer gear ring is obtained.
And obtaining a difference value after the first instantaneous rotating speed and the second instantaneous rotating speed are obtained, and obtaining an instantaneous speed fluctuation difference value through data processing modes such as filtering and the like on the signals.
And S203, calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed.
In step S201, for each rotation of the crankshaft, 60 first instant rotational speeds of the ring gear may be calculated, and the average rotational speed of the ring gear may be obtained by taking the average value of the 60 first instant rotational speeds.
And S204, carrying out difference processing on the average rotating speed and the first instant rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring.
And obtaining a difference value after obtaining the average rotating speed and the first instantaneous rotating speed, and obtaining a crankshaft torsional vibration value by carrying out data processing modes such as integration, filtering, fast Fourier transform and the like on the signal. The crankshaft torsional vibration value is angular displacement, also called angle, angular velocity value can be obtained through rotating speed value, angular velocity integral can obtain angle, and the method belongs to a conventional calculation mode of data processing, and is not repeated for specific processes.
S205, judging whether the crankshaft torsional vibration damper fails or not according to the relationship between the instantaneous speed fluctuation difference value and a preset first limit value and the relationship between the crankshaft torsional vibration value and a preset second limit value.
After the instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring is obtained in the step S202 and the crankshaft torsional vibration value of the inner gear ring is obtained in the step S204, whether the crankshaft torsional vibration damper fails or not is judged according to the respective overrun conditions.
In the above-described embodiment of the present application, the instantaneous speed fluctuation difference between the inner and outer ring gears is obtained by obtaining the first instantaneous rotational speed of the inner ring gear mounted on the crankshaft and the second instantaneous rotational speed of the outer ring gear, and performing difference processing on the first instantaneous rotational speed and the second instantaneous rotational speed. And calculating the average rotating speed of the inner gear ring according to the first instant rotating speed, and performing difference processing on the average rotating speed and the first instant rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring. And then judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value. According to the embodiment, the mode of judging whether the crankshaft torsional vibration damper fails or not effectively reduces the dependence on the experience of a technician according to the instantaneous speed fluctuation difference value and the overrun condition of the crankshaft torsional vibration value, so that the judgment result is more accurate.
Further, on the basis of the first embodiment, the following describes in detail the process of determining whether the crankshaft torsional vibration damper is failed according to the magnitude relationship between the instantaneous speed fluctuation difference and the preset first limit value and the magnitude relationship between the crankshaft torsional vibration value and the preset second limit value in the two pairs of steps S205 in the embodiment.
One way to determine failure of a crankshaft torsional vibration damper is to:
and if the instantaneous speed fluctuation difference value is greater than a preset first limit value and the crankshaft torsional vibration value is greater than a preset second limit value, the crankshaft torsional vibration damper fails.
Another way to determine failure of a crankshaft torsional vibration damper is to:
and if the instantaneous speed fluctuation difference value is greater than a preset first limit value and the crankshaft torsional vibration value is less than or equal to a preset second limit value, the crankshaft torsional vibration damper is invalid.
Therefore, when the instantaneous speed fluctuation difference value is larger than the preset first limit value, the possibility that the crankshaft torsional vibration damper breaks down is high, the torsional vibration is caused to exceed the limit, and the fault alarm prompt information of the crankshaft torsional vibration damper is output. Wherein, the mode of reporting to the police can be for buzzer sound or audible-visual annunciator send out scintillation and sound or voice alarm report pronunciation or show modes such as through visual display screen, here, this application does not explain one by one to concrete alarm device, the alarm device who lists does not consequently regard as the restriction to this application.
In the present application, the reason why the instantaneous speed fluctuation difference is used as one of the factors for determining whether the crankshaft torsional vibration damper is failed is as follows:
FIG. 3 is a theoretical model chart applicable to the present application, as shown in FIG. 3, to support why the instantaneous speed fluctuation difference is used as one of the determining factors for whether the crankshaft torsional vibration damper is failed.
In fig. 3, it is assumed that the angle through which the outer ring gear rotates during Δ t is
The angle of the inner gear ring is
Applying calculus theory, we can get from equations (1) - (2):
the instantaneous rotating speed of the outer gear ring is as follows:
the instantaneous rotating speed of the inner gear ring is as follows:
during the rotation of the crankshaft, the average rotating speed of the inner gear ring and the outer gear ring
Are the same, and therefore, the equations (3) and (4) can be obtained
The difference between the instantaneous rotating speed and the average rotating speed of the outer gear ring is as follows:
the difference between the instantaneous rotating speed and the average rotating speed of the inner gear ring is as follows:
from equation (5), the instantaneous speed fluctuation difference Δ ω is obtained:
as can be seen from the equation (5),
theoretically, if the leaf springs are not deformed relatively, then
I.e., the instantaneous speed fluctuation difference Δ ω is 0.
In fact, the plate spring may deform due to factors such as inertia force during rotation of the crankshaft, and the plate spring may be understood as a spring in the present application, where the deformation x of the spring is related to the acting force F and the stiffness k, and the relationship is as follows: and x is F/k. Wherein x corresponds to the relative deformation of the leaf spring
The acting force F linearly increases along with the increase of the rotating speed of the crankshaft, the spring stiffness k is not changed, and the plate spring is relatively deformed
And (4) increasing. Wherein, the spring stiffness k is unchanged, which is an ideal working condition. Thus, the greater the relative leaf spring deformation, the greater the instantaneous velocity fluctuation difference obtained, indicating a greater likelihood of leaf spring damper failure.
However, in the rotation process of the shock absorber, the spring stiffness k is different under the influence of different working conditions, internal oil flow and other factors, and the linear trend is not influenced. Fig. 4 is a test graph of the instantaneous speed fluctuation difference under different working conditions provided by the present application, where the working conditions include no-load, propulsion and appearance, and it can be seen from fig. 4 that the instantaneous speed fluctuation difference is only related to the structure of the shock absorber itself. Therefore, the larger the deformation of the leaf spring, the larger the difference in the instantaneous speed fluctuations obtained, and the greater the probability of failure of the leaf spring damper, regardless of the operating condition of the leaf spring damper.
In this embodiment, if the instantaneous speed fluctuation difference is greater than a preset first limit value and the crankshaft torsional vibration value is greater than a preset second limit value, the crankshaft torsional vibration damper fails; and if the instantaneous speed fluctuation difference value is greater than a preset first limit value and the crankshaft torsional vibration value is less than or equal to a preset second limit value, the crankshaft torsional vibration damper is invalid. Meanwhile, theoretical analysis is carried out on the fact that the instantaneous speed fluctuation difference value is used as one of factors for judging whether the crankshaft torsional vibration damper fails, and therefore the judgment result of the failure of the crankshaft torsional vibration damper is more accurate.
In the first and second embodiments, the relationship between the instantaneous speed fluctuation difference and the preset first limit value and the relationship between the crankshaft torsional vibration value and the preset second limit value are used to determine whether the crankshaft torsional vibration damper is out of order or not. In addition, according to the magnitude relation between the instantaneous speed fluctuation difference value and the preset first limit value and the magnitude relation between the crankshaft torsional vibration value and the preset second limit value, whether the crankshaft shaft system has a fault or not can be judged.
Specifically, if the instantaneous speed fluctuation difference value is less than or equal to a preset first limit value and the crankshaft torsional vibration value is greater than a preset second limit value, the crankshaft system fails. And if the crankshaft system fails, outputting a crankshaft system failure alarm prompt message.
The alarm mode can be for buzzer sound or audible and visual alarm send scintillation and sound or voice alarm report pronunciation or show modes such as show through visual display screen, here, do not explain one by one to concrete alarm device, the alarm device who lists does not consequently regard as the restriction to this application.
It can be understood that if the instantaneous speed fluctuation difference is less than or equal to the preset first limit value and the crankshaft torsional vibration value is less than or equal to the preset second limit value, both the crankshaft torsional vibration damper and the crankshaft shafting are normal.
In order to facilitate a complete understanding of the method of the present application, a brief description is given below by way of example three. As shown in fig. 5, fig. 5 is a schematic flowchart of a method for determining a crankshaft torsional oscillation overrun provided in the third embodiment of the present application.
The method comprises the steps of obtaining a rotating speed signal of an inner gear ring through a rotating speed sensor, obtaining a first instantaneous rotating speed of the inner gear ring according to the rotating speed signal, correspondingly obtaining a rotating speed signal of an outer gear ring through the rotating speed sensor, and obtaining a second instantaneous rotating speed of the outer gear ring according to the rotating speed signal.
And performing difference and filtering processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference value A of the inner gear ring and the outer gear ring.
And calculating the average rotating speed according to the rotating speed signal of the inner gear ring, and performing difference, integration, filtering, fast Fourier transform and other processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value B of the inner gear ring.
And judging the reason causing the over-limit of the torsional vibration of the crankshaft according to the over-limit condition of the instantaneous speed fluctuation difference A and the torsional vibration value B of the crankshaft.
In particular, the method comprises the following steps of,
if the instantaneous speed fluctuation difference value A is larger than a preset first limit value and the crankshaft torsional vibration value B is larger than a preset second limit value, namely A, B is over-limited, the crankshaft torsional vibration damper fails.
If the instantaneous speed fluctuation difference value A is larger than a preset first limit value and the crankshaft torsional vibration value B is smaller than or equal to a preset second limit value, namely A exceeds the limit and B is normal, the crankshaft torsional vibration damper fails.
If the instantaneous speed fluctuation difference value A is smaller than or equal to a preset first limit value and the crankshaft torsional vibration value B is larger than a preset second limit value, namely the A is normal and the B is out of limit, the crankshaft system fails.
If the instantaneous speed fluctuation difference value A is smaller than or equal to a preset first limit value and the crankshaft torsional vibration value B is smaller than or equal to a preset second limit value, A, B are normal, the crankshaft torsional vibration damper and the crankshaft shaft system are normal.
In the embodiment of the application, the judgment result of the reason causing the crankshaft torsional vibration overrun is more accurate according to the overrun condition of the instantaneous speed fluctuation difference value A and the crankshaft torsional vibration value B.
Fig. 6 is a schematic structural diagram of a failure determination device for a crankshaft torsional vibration damper according to a fourth embodiment of the present application, and as shown in fig. 6, the device includes: an obtaining module 601, a difference processing module 602, a calculating module 603, and a judging module 604.
The acquisition module 601 is used for acquiring a first instantaneous rotating speed of an inner gear ring mounted on a crankshaft and a second instantaneous rotating speed of an outer gear ring.
And the difference processing module 602 is configured to perform difference processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference between the inner ring gear and the outer ring gear.
And a calculating module 603, configured to calculate an average rotation speed of the ring gear according to the first instantaneous rotation speed.
The difference processing module 602 is further configured to perform difference processing on the average rotational speed and the first instantaneous rotational speed to obtain a crankshaft torsional vibration value of the ring gear.
The determining module 604 is configured to determine whether the crankshaft torsional vibration damper fails according to a magnitude relationship between the instantaneous speed fluctuation difference and a preset first limit, and a magnitude relationship between the crankshaft torsional vibration value and a preset second limit.
One possible implementation manner is that the determining module 604 is specifically configured to:
and if the instantaneous speed fluctuation difference value is greater than a preset first limit value and the crankshaft torsional vibration value is greater than a preset second limit value, the crankshaft torsional vibration damper is out of work.
Or if the instantaneous speed fluctuation difference value is larger than a preset first limit value and the crankshaft torsional vibration value is smaller than or equal to a preset second limit value, the crankshaft torsional vibration damper is invalid.
One possible implementation manner is that the failure determination device for the crankshaft torsional vibration damper further includes an output module configured to:
and if the failure of the crankshaft torsional vibration damper is judged, outputting fault alarm prompt information of the crankshaft torsional vibration damper.
In a possible implementation manner, the determining module 604 is further specifically configured to:
and judging whether the crankshaft system has a fault or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
In a possible implementation manner, the determining module 604 is further specifically configured to:
and if the instantaneous speed fluctuation difference value is less than or equal to a preset first limit value and the crankshaft torsional vibration value is greater than a preset second limit value, the crankshaft system fails.
One possible implementation manner is that the output module is further specifically configured to:
and if the crankshaft system is judged to be in fault, outputting fault alarm prompt information of the crankshaft system.
In a possible implementation manner, the determining module 604 is further specifically configured to:
and if the instantaneous speed fluctuation difference value is less than or equal to a preset first limit value and the crankshaft torsional vibration value is less than or equal to a preset second limit value, the crankshaft torsional vibration damper and the crankshaft system are normal.
The failure determination device for the crankshaft torsional vibration damper provided in this embodiment is used for executing the method executed in the foregoing embodiment, and the implementation principle and the technical effect thereof are similar, and are not described again.
Fig. 7 is a schematic structural diagram of a failure determination device for a crankshaft torsional vibration damper according to a fifth embodiment of the present application. The device may be, for example, a server or the like. As shown in fig. 7, the apparatus may include: at least one processor 701 and memory 702, at least two rotational speed sensors 703.
A rotational speed sensor 703 for acquiring a first instantaneous rotational speed of an inner ring gear mounted on the crankshaft and a second instantaneous rotational speed of an outer ring gear;
and a memory 702 for storing programs. In particular, the program may include program code comprising computer operating instructions.
The memory 702 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 701 is configured to execute computer-executable instructions stored in the memory 702 to implement the methods described in the foregoing method embodiments. The processor 701 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present Application.
Optionally, the device may also include a communication interface 704. In a specific implementation, if the communication interface 703, the memory 702 and the processor 701 are implemented independently, the communication interface 704, the memory 702 and the processor 701 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. Buses may be classified as address buses, data buses, control buses, etc., but do not represent only one bus or type of bus.
Optionally, in a specific implementation, if the communication interface 704, the rotation speed sensor 703, the memory 702 and the processor 701 are integrated into a chip, the communication interface 704, the rotation speed sensor 703, the memory 702 and the processor 701 may complete communication through an internal interface.
The failure determining device of the crankshaft torsional vibration damper provided by the embodiment is used for executing the method executed by the previous embodiment, the implementation principle and the technical effect are similar, and the detailed description is omitted.
The present application also provides a computer-readable storage medium, which may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and in particular, the computer-readable storage medium stores program instructions, and the program instructions are used in the method in the foregoing embodiments.
The present application further provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the electronic device may read the executable instructions from the readable storage medium, and the execution of the executable instructions by the at least one processor causes the electronic device to implement the failure determination method for the crankshaft torsional vibration damper provided in the various embodiments described above.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A failure judgment method for a crankshaft torsional vibration damper is characterized by comprising the following steps:
acquiring a first instantaneous rotating speed of an inner gear ring installed on a crankshaft and a second instantaneous rotating speed of an outer gear ring;
performing difference processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring;
calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed;
performing difference processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring;
and judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
2. The method of claim 1, wherein determining whether the crankshaft torsional vibration damper is disabled based on the magnitude of the instantaneous speed fluctuation difference and a predetermined first limit, and the magnitude of the crankshaft torsional vibration value and a predetermined second limit comprises:
if the instantaneous speed fluctuation difference value is larger than the preset first limit value and the crankshaft torsional vibration value is larger than the preset second limit value, the crankshaft torsional vibration damper is invalid;
or if the instantaneous speed fluctuation difference value is greater than the preset first limit value and the crankshaft torsional vibration value is less than or equal to the preset second limit value, the crankshaft torsional vibration damper fails.
3. The method of claim 2, wherein a crankshaft torsional vibration damper fault alert message is output if it is determined that the crankshaft torsional vibration damper is not functional.
4. The method according to claim 1 or 2, characterized in that the method further comprises:
and judging whether the crankshaft system has a fault or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
5. The method of claim 4, wherein the determining whether the crankshaft system is faulty according to the relationship between the instantaneous speed fluctuation difference and a preset first limit value and the relationship between the crankshaft torsional vibration value and a preset second limit value comprises:
and if the instantaneous speed fluctuation difference value is smaller than or equal to the preset first limit value and the crankshaft torsional vibration value is larger than the preset second limit value, the crankshaft shafting breaks down.
6. The method according to claim 5, wherein if the crankshaft system is judged to be in fault, a crankshaft system fault alarm prompt message is output.
7. The method of claim 5, further comprising:
and if the instantaneous speed fluctuation difference is smaller than or equal to the preset first limit value and the crankshaft torsional vibration value is smaller than or equal to the preset second limit value, the crankshaft torsional vibration damper and the crankshaft shafting are normal.
8. The utility model provides a bent axle torsional vibration damper's failure judgement device which characterized in that includes:
the acquisition module is used for acquiring a first instantaneous rotating speed of an inner gear ring arranged on the crankshaft and a second instantaneous rotating speed of an outer gear ring;
the difference processing module is used for performing difference processing on the first instantaneous rotating speed and the second instantaneous rotating speed to obtain an instantaneous speed fluctuation difference value of the inner gear ring and the outer gear ring;
the calculation module is used for calculating the average rotating speed of the inner gear ring according to the first instantaneous rotating speed;
the difference processing module is further used for carrying out difference processing on the average rotating speed and the first instantaneous rotating speed to obtain a crankshaft torsional vibration value of the inner gear ring;
and the judging module is used for judging whether the crankshaft torsional vibration damper fails or not according to the magnitude relation between the instantaneous speed fluctuation difference value and a preset first limit value and the magnitude relation between the crankshaft torsional vibration value and a preset second limit value.
9. An failure judgment device for a crankshaft torsional vibration damper, comprising: the system comprises at least two rotation speed sensors, a processor and a memory which is in communication connection with the processor;
the rotating speed sensor is used for acquiring a first instantaneous rotating speed of an inner gear ring arranged on the crankshaft and a second instantaneous rotating speed of an outer gear ring;
the memory stores computer execution instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1 to 7.
10. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, are configured to implement the method of any one of claims 1 to 7.
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