CN109708747B - Engine shafting torsional vibration monitoring method and engine shafting torsional vibration monitoring device - Google Patents
Engine shafting torsional vibration monitoring method and engine shafting torsional vibration monitoring device Download PDFInfo
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- CN109708747B CN109708747B CN201811607814.6A CN201811607814A CN109708747B CN 109708747 B CN109708747 B CN 109708747B CN 201811607814 A CN201811607814 A CN 201811607814A CN 109708747 B CN109708747 B CN 109708747B
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Abstract
The invention provides an engine shafting torsional vibration monitoring method and an engine shafting torsional vibration monitoring device, which comprise the following steps: acquiring a rotating speed signal of a signal panel; converting the rotating speed signal into a shafting torsional vibration signal; judging whether the engine is in a transient working condition or not; if so, performing transient working condition overrun alarm when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold; and if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal is greater than or equal to the first non-transient working condition alarm threshold value, the non-transient working condition overrun alarm is carried out. The method and the device convert the real-time acquired rotating speed signal into the shafting torsional vibration signal and compare the shafting torsional vibration signal with the alarm threshold corresponding to the working condition according to different engine working conditions to determine whether the engine shafting torsional vibration exceeds the limit due to abnormality or not, and then can alarm when the engine shafting torsional vibration is abnormal, so that a driver can find the shafting torsional vibration abnormality of the engine, and the normal use of the engine is ensured.
Description
Technical Field
The invention relates to the field of engine monitoring, in particular to an engine shafting torsional vibration monitoring method and an engine shafting torsional vibration monitoring device.
Background
The engine shafting is a system composed of a torsional vibration damper, a crankshaft, a flywheel, a transmission shaft, fastening bolts and the like, and is a key mechanism for power transmission of the engine, so that the stable operation of the shafting is particularly important. The common failures of the engine shafting comprise failures such as shock absorber failures or crankshaft breakage, and the main reason for the failures is shafting torsional vibration abnormity, the engine shafting torsional vibration is an unnecessary measurement item in the daily use process, and the abnormity of the engine shafting torsional vibration cannot be found in time, so that the normal use of the engine is influenced.
Disclosure of Invention
In view of the above, the invention provides an engine shafting torsional vibration monitoring method and an engine shafting torsional vibration monitoring device, which effectively solve the existing technical problems, and alarm is given when the engine shafting torsional vibration exceeds an alarm threshold value by monitoring the engine shafting torsional vibration, so that a driver can timely find the abnormal condition of the engine shafting torsional vibration, and the normal use of an engine is ensured.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an engine shafting torsional vibration monitoring method comprises the following steps:
acquiring a rotating speed signal of a signal panel in real time;
converting the rotating speed signal into a shafting torsional vibration signal;
judging whether the engine is in a transient working condition or not; if so, performing transient working condition overrun alarm when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold;
and if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal is greater than or equal to the first non-transient working condition alarm threshold value, the non-transient working condition overrun alarm is carried out.
Optionally, the strategy for determining that the engine is in the transient operating condition includes: the increasing rate of the rotating speed of the engine is greater than a first preset threshold value within a first preset time; or the engine power increasing rate is larger than a second preset threshold value within the first preset time, or the circulating oil supply quantity change rate is larger than a third preset threshold value within the first preset time.
Optionally, when the transient operating condition overrun alarm is performed, the transient operating condition overrun judgment result is prompted to the driver, and the transient operating condition overrun judgment result includes: the engine shafting torsional vibration overrun is caused by large impact of variable working conditions on the shafting torsional vibration.
Optionally, the second non-transient operating condition alarm threshold is greater than the first non-transient operating condition alarm threshold;
when the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold, the alarming for the overrun of the non-transient working condition comprises the following steps: the system comprises a first non-transient working condition overrun alarm, a second non-transient working condition overrun alarm, a third non-transient working condition overrun alarm and a fourth non-transient working condition overrun alarm;
the time for completing the operation of the engine in a matching mode is less than or equal to a preset operation time threshold, the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is less than a second non-transient working condition alarm threshold, and the first non-transient working condition overrun alarm is carried out;
the time for completing the operation of the engine in a matching way is less than or equal to a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that second non-transient working condition overrun alarm is performed;
the time for completing the matching operation of the engine is greater than a preset operation time threshold, and a shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is smaller than a second non-transient working condition alarm threshold, and a third non-transient working condition overrun alarm is performed;
and (4) the time for completing the matching operation of the engine is greater than a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that a fourth non-transient working condition overrun alarm is performed.
Optionally, when the first non-transient operating condition overrun alarm is performed, a first non-transient operating condition determination result is prompted to the driver, where the first non-transient operating condition determination result includes: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device.
Optionally, when the second non-transient operating condition overrun alarm is performed, a second non-transient operating condition judgment result is prompted to the driver, and the torque limiting protection operation is performed on the engine, where the second non-transient operating condition judgment result includes: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device.
Optionally, when the third non-transient operating condition overrun alarm is performed, a third non-transient operating condition determination result is prompted to the driver, where the third non-transient operating condition determination result includes: the shafting torsional overrun is due to torsional damper degradation.
Optionally, when the fourth non-transient operating condition overrun alarm is performed, a fourth non-transient operating condition determination result is prompted to the driver, and a torque limiting protection operation is performed on the engine, where the fourth non-transient operating condition determination result includes: the shafting torsional overrun is due to torsional damper degradation.
Optionally, recording and storing the number and time of transient working condition overrun alarms;
and/or recording and storing the alarming times and time of the non-transient working condition overrun alarming.
An engine shafting torsional vibration monitoring device comprising: the device comprises a signal panel, a crankshaft rotation speed sensor, a sensor bracket, an electric control unit and an alarm device;
the signal panel is installed on the crankshaft, and the signal panel and the crankshaft rotate synchronously;
the crankshaft rotating speed sensor is fixed on an engine through the sensor support and is used for acquiring rotating speed signals of the signal panel in real time and sending the acquired rotating speed signals of the signal panel to the electric control unit;
the electric control unit is used for converting the rotating speed signal of the signal panel into a shafting torsional vibration signal and judging whether the engine is in a transient working condition or not; if so, controlling the alarm device to alarm under the transient working condition when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold;
if not, judging that the engine is in a non-transient working condition, and controlling the alarm device to alarm in the non-transient working condition when the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold value.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
the invention provides an engine shafting torsional vibration monitoring method and an engine shafting torsional vibration monitoring device, which comprise the following steps: acquiring a rotating speed signal of a signal panel; converting the rotating speed signal into a shafting torsional vibration signal; judging whether the engine is in a transient working condition or not; if so, performing transient working condition overrun alarm when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold; and if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal is greater than or equal to the first non-transient working condition alarm threshold value, the non-transient working condition overrun alarm is carried out. The invention realizes real-time monitoring of crankshaft torsional vibration, and gives an alarm when the torsional vibration of the engine shafting exceeds an alarm threshold value by converting a real-time acquired rotating speed signal into a shafting torsional vibration signal, so that a driver can find the abnormal condition of the torsional vibration of the engine shafting in time and the normal use of the engine is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for monitoring torsional vibration of an engine shafting according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for monitoring torsional vibration of an engine shafting according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for monitoring torsional vibration of an engine shafting according to a third embodiment of the present invention;
fig. 4 is a flowchart of a method for monitoring torsional vibration of an engine shafting according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the existing engine, the torsional vibration of an engine shafting has more influence factors, and the engine ignition sequence, the shafting rigidity, the torsional vibration damper, the rotary inertia of a shafting driving device, the impact of transient working conditions on the shafting and the like are summarized. Because the ignition sequence of the engine and the shafting rigidity are determined during design, the invention only analyzes the influence factors such as the shafting impact and the like aiming at the torsional vibration damper, the rotary inertia of the shafting driving device and the transient working condition.
Example one
Referring to the method shown in fig. 1, fig. 1 is a flowchart of an engine shafting torsional vibration monitoring method according to an embodiment of the present invention, where the engine shafting torsional vibration monitoring method includes:
acquiring a rotating speed signal of a signal panel in real time;
converting the rotating speed signal into a shafting torsional vibration signal Y;
judging whether the engine is in a transient working condition or not; if yes, performing transient working condition overrun alarm when the shafting torsional vibration signal Y is greater than or equal to the transient working condition alarm threshold;
and if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold value Y1, performing non-transient working condition overrun alarm.
The strategy for judging the transient working condition of the engine comprises the following steps: the increasing rate of the rotating speed of the engine is greater than a first preset threshold value within a first preset time; or the engine power increasing rate is larger than a second preset threshold value within the first preset time, or the circulating oil supply quantity change rate is larger than a third preset threshold value within the first preset time.
And when the shafting torsional vibration signal Y is smaller than the transient working condition alarm threshold, indicating that the engine shafting torsional vibration is not abnormal. And when the shafting torsional vibration signal Y is smaller than a first non-transient working condition alarm threshold Y1, indicating that the engine shafting torsional vibration is not abnormal.
The first preset time, the first preset threshold, the second preset threshold and the third preset threshold provided by the embodiment of the application can be preset according to actual needs. In an embodiment of the present application, the first preset time may be set to be 1 minute, the first preset threshold is 3%, the second preset threshold is 3%, and the third preset threshold is 3%. Of course, the values of the first preset threshold, the second preset threshold and the third preset threshold may be the same or different, and the present application is not limited specifically.
Furthermore, in the monitoring process, the number of times and time of transient working condition overrun alarming can be recorded and stored; and/or recording and storing the alarming times and time of the non-transient working condition overrun alarming. By recording the times and time of the alarms only when the alarms are out of limit, the storage space is saved and reference can be provided when troubleshooting is carried out.
The method for monitoring torsional vibration of the shafting of the engine provided by the embodiment comprises the following steps: acquiring a rotating speed signal of a signal panel; converting the rotating speed signal into a shafting torsional vibration signal Y; judging whether the engine is in a transient working condition or not; if yes, performing transient working condition overrun alarm when the shafting torsional vibration signal Y is greater than or equal to the transient working condition alarm threshold; and if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold value Y1, performing non-transient working condition overrun alarm. The real-time monitoring of the torsional vibration of the crankshaft is realized in the embodiment, the rotating speed signals are acquired in real time and converted into the torsional vibration signals Y of the shafting, the torsional vibration signals Y of the shafting are compared with the alarm threshold corresponding to the working conditions according to different engine working conditions to determine whether the torsional vibration of the engine shafting exceeds the limit due to abnormity, and then the alarm can be given when the torsional vibration of the engine shafting is abnormal, so that a driver can find that the torsional vibration of the engine shafting is abnormal, and the normal use of the engine is ensured.
Example two
Referring to the method shown in fig. 2, fig. 2 is a flowchart of an engine shafting torsional vibration monitoring method according to a second embodiment of the present invention, where the engine shafting torsional vibration monitoring method includes:
an engine shafting torsional vibration monitoring method comprises the following steps:
acquiring a rotating speed signal of a signal panel in real time;
converting the rotating speed signal into a shafting torsional vibration signal Y;
judging whether the engine is in a transient working condition or not; if yes, when shafting torsional vibration signal Y is greater than or equal to transient operating mode alarm threshold, transient operating mode overrun warning is carried out, the driver transient operating mode overrun judgment result is reminded simultaneously, transient operating mode overrun judgment result includes: the engine shafting torsional vibration overrun is caused by large impact on the shafting torsional vibration under variable working conditions; on the basis, the use habit of changing the working condition can be prompted to the driver through the display device.
And if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold value Y1, performing non-transient working condition overrun alarm.
It can be understood that, under the transient working condition, when the engine suddenly changes the load, because the response speed of the engine is inconsistent with the response speed of the driven device, the inconsistency can act on the shafting torsional vibration to increase, therefore, when the engine is in the transient working condition and the shafting torsional vibration signal Y exceeds the alarm threshold value of the transient working condition, the shafting torsional vibration abnormity caused by the sudden change of the load of the engine is determined, the transient working condition overrun alarm is carried out, and meanwhile, the judgment result is output to prompt the driver to judge the overrun judgment result of the transient working condition, thereby enabling the driver to change the use habit of the working condition.
The transient working condition alarm threshold is a threshold used for judging whether the shafting torsional vibration of the engine is abnormal under the transient working condition, and can be set as required.
In the embodiment of the application, the transient working condition overrun alarm is an audible and visual alarm and/or an alarm prompt of displaying 'transient working condition overrun' by a display device.
And the mode of prompting the driver transient working condition overrun judgment result provided by the embodiment of the application is to display that the engine shafting torsional oscillation overrun is caused by the large impact of the variable working condition on the shafting torsional oscillation on the display device.
According to the monitoring method for the torsional vibration of the engine shafting, the rotating speed signal obtained in real time is converted into the shafting torsional vibration signal Y, the shafting torsional vibration signal Y is compared with the alarm threshold value corresponding to the working condition according to different engine working conditions, whether the torsional vibration of the engine shafting exceeds the limit or not is determined, and then the alarm can be given when the torsional vibration of the engine shafting is abnormal, so that a driver can find that the torsional vibration of the engine shafting is abnormal. On the basis, the reason of overrun alarm under the transient working condition can be accurately judged by judging that the engine is in the transient working condition and combining the overrun alarm value of the transient working condition, and a driver is prompted, so that the use habit of the driver under the transient working condition can be changed, and the normal use of the engine is ensured.
EXAMPLE III
Based on the first embodiment, referring to the method shown in fig. 3, in the third embodiment of the present invention, a preset operation time threshold T1 and a second non-transient operating condition alarm threshold Y2 are further set, where the second non-transient operating condition alarm threshold Y2 is greater than the first non-transient operating condition alarm threshold Y1; by setting the preset operation time threshold T1, the first non-transient working condition alarm threshold Y1 and the second non-transient working condition alarm threshold Y2, the non-transient working condition overrun alarm can be divided more accurately. That is, if the engine is in the non-transient operating condition, when the shafting torsional vibration signal Y is greater than or equal to the first non-transient operating condition alarm threshold value Y1, performing the non-transient operating condition overrun alarm according to the embodiment of the present invention includes:
when the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold value Y1, performing non-transient working condition overrun alarm comprises the following steps: the system comprises a first non-transient working condition overrun alarm, a second non-transient working condition overrun alarm, a third non-transient working condition overrun alarm and a fourth non-transient working condition overrun alarm;
the time T for completing the matching operation of the engine is less than or equal to a preset operation time threshold T1, the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold Y1 and is less than a second non-transient working condition alarm threshold Y2, and the first non-transient working condition overrun alarm is carried out;
the time T for completing the matching operation of the engine is less than or equal to a preset operation time threshold T1, and the shafting torsional vibration signal Y is greater than a second non-transient working condition alarm threshold Y2, so that second non-transient working condition overrun alarm is performed;
the time T for completing the matching operation of the engine is greater than a preset operation time threshold T1, and a shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold Y1 and smaller than a second non-transient working condition alarm threshold Y2, so that third non-transient working condition overrun alarm is performed;
and (3) the time T for completing the matching operation of the engine is greater than a preset operation time threshold T1, the shafting torsional vibration signal Y is greater than a second non-transient working condition alarm threshold Y2, and a fourth non-transient working condition overrun alarm is carried out.
The first non-transient condition alarm threshold value Y1 and the second non-transient condition alarm threshold value Y2 can be set according to actual needs.
Specifically, the first non-transient operating condition overrun alarm mode may be an audible and visual alarm and/or a display device displaying "the first non-transient operating condition overrun".
The alarm mode of the second non-transient operating condition overrun alarm can be an audible and visual alarm and/or a display device displaying 'the second non-transient operating condition overrun'.
The alarm mode of the third non-transient working condition overrun alarm can be acousto-optic alarm and/or display device to display 'the third non-transient working condition overrun'.
The alarm mode of the fourth non-transient working condition overrun alarm can be an audible and visual alarm and/or a display device for displaying the fourth non-transient working condition overrun "
The acousto-optic alarm mode of the first non-transient working condition overrun alarm, the acousto-optic alarm mode of the second non-transient working condition overrun alarm, the acousto-optic alarm mode of the third non-transient working condition overrun alarm and the acousto-optic alarm mode of the fourth non-transient working condition overrun alarm can be the same or different;
the preset operation time threshold value T1, the second non-transient operating condition alarm threshold value Y2 and the first non-transient operating condition alarm threshold value Y1 that this application embodiment provided can realize setting according to actual need, and in this application embodiment, this application can set for operation time threshold value T1 to be 500 hours, does not do specific restriction to this application.
In the method for monitoring torsional vibration of the shafting of the engine provided by the third embodiment, by setting the preset operation time threshold T1, the first non-transient operating condition alarm threshold Y1 and the second non-transient operating condition alarm threshold Y2, the over-limit alarm of the non-transient operating condition can be more accurately classified.
Example four
Based on the third embodiment, referring to the method shown in fig. 4, in order to accurately determine the reason for the overrun alarm under the non-transient working condition and prompt the driver, in the fourth embodiment of the invention:
when the first non-transient working condition overrun alarm is carried out, a first non-transient working condition judgment result is prompted to a driver, and the first non-transient working condition judgment result comprises the following steps: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device. On the basis, a display device can prompt a driver to recheck the torsional vibration of the shafting and match a proper shock absorber or reduce the rotational inertia of the crankshaft device.
When the second non-transient working condition overrun alarm is carried out, a second non-transient working condition judgment result is prompted to a driver, and torque limiting protection operation is carried out on the engine, wherein the second non-transient working condition judgment result comprises the following steps: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device. On the basis, a display device can prompt a driver to recheck the torsional vibration of the shafting and match a proper shock absorber or reduce the rotational inertia of the crankshaft device.
And prompting a third non-transient working condition judgment result to a driver while performing the third non-transient working condition overrun alarm, wherein the third non-transient working condition judgment result comprises: the shafting torsional overrun is due to torsional damper degradation. On the basis, the display device can also prompt the driver to replace the torsional vibration damper.
When the fourth non-transient working condition overrun alarm is carried out, a fourth non-transient working condition judgment result is prompted to a driver, and torque limiting protection operation is carried out on the engine, wherein the fourth non-transient working condition judgment result comprises the following steps: the shafting torsional overrun is due to torsional damper degradation. On the basis, the display device can also prompt the driver to replace the torsional vibration damper.
It can be understood that the torsional vibration of the engine shafting is mainly influenced by the combined action of the rotating inertia force of each cylinder and the rotating inertia force of the driving device, the torsional vibration of the shafting is balanced by adding a torsional vibration damper at the free end of the crankshaft, and if the damper is too small in matching or the damper is degraded, the torsional vibration of the shafting cannot be balanced, so that the overrun is caused.
At the initial stage of matching, namely, the time T for completing the matching operation of the engine is less than or equal to a preset operation time threshold T1, it is indicated that the time for the shock absorber to degrade is not reached, and when the shafting torsional vibration signal Y is greater than a first non-transient working condition alarm threshold Y1, or the shafting torsional vibration signal Y is greater than a second non-transient working condition alarm threshold Y2, it is determined that the shafting torsional vibration is caused by too small a matching shock absorber or too large rotational inertia of a driven device;
if no alarm is given to shafting torsional vibration in the initial use stage, the engine vibration absorber is matched to balance the engine shafting torsional vibration, after the engine vibration absorber runs for a period of time, the balance solution in the vibration absorber gradually degrades under the action of temperature to weaken the balance capability, and when the balance capability of the vibration absorber is not enough to compensate the shafting torsional vibration, the shafting torsional vibration exceeds the limit. That is, when the time T for completing the matching operation of the engine is greater than the preset operation time threshold T1, and the shafting torsional vibration signal Y is greater than the first non-transient operating condition alarm threshold Y1, or the shafting torsional vibration signal Y is greater than the second non-transient operating condition alarm threshold Y2, the shafting torsional vibration overrun is mainly affected by the degradation of the shock absorber.
And when the shafting torsional vibration signal Y is larger than the second non-transient working condition alarm threshold Y2, the shafting torsional vibration is very large at the moment, and the continuous operation can generate adverse effects on the engine, so when the shafting torsional vibration signal Y is larger than the second non-transient working condition alarm threshold Y2, the torsion limiting protection operation can be carried out on the engine while alarming.
In the method for monitoring torsional vibration of the shafting of the engine provided by the fourth embodiment, the reason for the overrun alarm under the non-transient working condition can be accurately judged and the driver can be prompted by judging that the engine is in the non-transient working condition and combining the overrun alarm value under the non-transient working condition and the preset running time threshold value T1, so that the driver can maintain the engine in time. And when the torsional vibration signal Y of the shaft system is greater than the second non-transient working condition alarm threshold value Y2, the torque limiting protection operation is carried out on the engine so as to avoid generating adverse effects on the engine.
EXAMPLE five
The fifth embodiment of the present invention further provides an engine shafting torsional vibration monitoring apparatus, where the engine shafting torsional vibration monitoring apparatus provided in the fifth embodiment of the present invention includes:
the device comprises a signal panel, a crankshaft rotation speed sensor, a sensor bracket, an electric control unit and an alarm device;
the signal panel is installed on the crankshaft, and the signal panel and the crankshaft rotate synchronously;
the crankshaft rotating speed sensor is fixed on an engine through the sensor support and is used for acquiring a rotating speed signal of the signal panel in real time and sending the acquired rotating speed signal of the signal panel to the electric control unit, wherein the rotating speed signal acquired in real time of the signal panel is transmitted to the electric control unit in real time as a detection result of the crankshaft rotating speed sensor;
the electric control unit is used for converting the rotating speed signal of the signal panel into a shafting torsional vibration signal Y and judging whether the engine is in a transient working condition or not; if yes, controlling the alarm device to alarm under the transient working condition when the shafting torsional vibration signal Y is greater than or equal to the transient working condition alarm threshold;
if not, judging that the engine is in a non-transient working condition, and controlling the alarm device to alarm in the non-transient working condition when the shafting torsional vibration signal Y is greater than or equal to a first non-transient working condition alarm threshold value Y1.
The signal panel is a thin-wall stamped steel plate, partial materials are punched out of the outer ring of the signal panel according to timing requirements to form a sawtooth shape, a positioning pin hole is formed in the signal panel and is matched with the crankshaft in timing, the signal panel is fixed at a proper position of the free end of the crankshaft, and synchronous rotation of the signal panel and the crankshaft is guaranteed.
The rotating speed signal of the signal panel acquired by the crankshaft rotating speed sensor in real time is transmitted to the electric control unit through an engine wire harness and converted into a shafting torsional vibration signal Y in the electric control unit;
the alarm device includes: an audible and visual alarm device and/or a display device.
When transient working condition alarm or non-transient working condition alarm is carried out, the electric control unit transmits signals to the alarm device through the CAN bus to alarm, and when a judgment result needs to be output, the judgment result is transmitted to the display device through the CAN bus to display the judgment result on the display device and give a maintenance suggestion. When the torque-limiting protection operation needs to be carried out on the engine, the electric control unit can transmit a preset control strategy to the engine to carry out the torque-limiting protection operation on the engine, and the self-protection of the engine is realized.
The engine shafting torsional vibration monitoring device in the embodiment determines whether the engine shafting torsional vibration is over-limit due to abnormality by converting a real-time acquired rotating speed signal into a shafting torsional vibration signal Y and comparing the shafting torsional vibration signal Y with an alarm threshold value corresponding to working conditions according to different engine working conditions, and then can give an alarm when the engine shafting torsional vibration is abnormal, so that a driver can find that the shafting torsional vibration of the engine is abnormal, and the normal use of the engine is ensured.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for monitoring torsional vibration of an engine shafting is characterized by comprising the following steps:
acquiring a rotating speed signal of a signal panel in real time;
converting the rotating speed signal into a shafting torsional vibration signal;
judging whether the engine is in a transient working condition or not; if so, performing transient working condition overrun alarm when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold;
if not, the engine is in a non-transient working condition, and when the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold value, the non-transient working condition overrun alarm is performed, and the method comprises the following steps: the system comprises a first non-transient working condition overrun alarm, a second non-transient working condition overrun alarm, a third non-transient working condition overrun alarm and a fourth non-transient working condition overrun alarm;
the time for completing the operation of the engine in a matching mode is less than or equal to a preset operation time threshold, the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is less than a second non-transient working condition alarm threshold, and the first non-transient working condition overrun alarm is carried out;
the time for completing the operation of the engine in a matching way is less than or equal to a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that second non-transient working condition overrun alarm is performed;
the time for completing the matching operation of the engine is greater than a preset operation time threshold, and a shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is smaller than a second non-transient working condition alarm threshold, and a third non-transient working condition overrun alarm is performed;
and (4) the time for completing the matching operation of the engine is greater than a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that a fourth non-transient working condition overrun alarm is performed.
2. The method for monitoring torsional vibration of a shafting of an engine as claimed in claim 1, wherein said strategy for determining that the engine is in a transient condition comprises: the increasing rate of the rotating speed of the engine is greater than a first preset threshold value within a first preset time; or the engine power increasing rate is larger than a second preset threshold value within the first preset time, or the circulating oil supply quantity change rate is larger than a third preset threshold value within the first preset time.
3. The engine shafting torsional vibration monitoring method of claim 1, further comprising: when the transient working condition overrun alarm is carried out, the over-limit judgment result of the transient working condition is prompted to a driver, and the over-limit judgment result of the transient working condition comprises the following steps: the engine shafting torsional vibration overrun is caused by large impact of variable working conditions on the shafting torsional vibration.
4. The engine shafting torsional vibration monitoring method of claim 1, further comprising: when the first non-transient working condition overrun alarm is carried out, a first non-transient working condition judgment result is prompted to a driver, and the first non-transient working condition judgment result comprises the following steps: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device.
5. The engine shafting torsional vibration monitoring method of claim 1, further comprising: when the second non-transient working condition overrun alarm is carried out, a second non-transient working condition judgment result is prompted to a driver, and torque limiting protection operation is carried out on the engine, wherein the second non-transient working condition judgment result comprises the following steps: the shafting torsional vibration is over-limited due to improper matching of the vibration absorber or large rotational inertia of an engine shafting driving device.
6. The engine shafting torsional vibration monitoring method of claim 1, further comprising: and prompting a third non-transient working condition judgment result to a driver while performing the third non-transient working condition overrun alarm, wherein the third non-transient working condition judgment result comprises: the shafting torsional overrun is due to torsional damper degradation.
7. The engine shafting torsional vibration monitoring method of claim 1, further comprising: when the fourth non-transient working condition overrun alarm is carried out, a fourth non-transient working condition judgment result is prompted to a driver, and torque limiting protection operation is carried out on the engine, wherein the fourth non-transient working condition judgment result comprises the following steps: the shafting torsional overrun is due to torsional damper degradation.
8. The engine shafting torsional vibration monitoring method of claim 1, further comprising: recording and storing the number and time of transient working condition overrun alarm;
and/or recording and storing the alarming times and time of the non-transient working condition overrun alarming.
9. An engine shafting torsional vibration monitoring device, comprising: the device comprises a signal panel, a crankshaft rotation speed sensor, a sensor bracket, an electric control unit and an alarm device;
the signal panel is installed on the crankshaft, and the signal panel and the crankshaft rotate synchronously;
the crankshaft rotating speed sensor is fixed on an engine through the sensor support and is used for acquiring rotating speed signals of the signal panel in real time and sending the acquired rotating speed signals of the signal panel to the electric control unit;
the electric control unit is used for converting the rotating speed signal of the signal panel into a shafting torsional vibration signal and judging whether the engine is in a transient working condition or not; if so, controlling the alarm device to alarm under the transient working condition when the shafting torsional vibration signal is greater than or equal to the transient working condition alarm threshold;
if not, judging that the engine is in a non-transient working condition, and controlling the alarm device to alarm in the non-transient working condition when the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold value, wherein the method comprises the following steps: the system comprises a first non-transient working condition overrun alarm, a second non-transient working condition overrun alarm, a third non-transient working condition overrun alarm and a fourth non-transient working condition overrun alarm;
the time for completing the operation of the engine in a matching mode is less than or equal to a preset operation time threshold, the shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is less than a second non-transient working condition alarm threshold, and the first non-transient working condition overrun alarm is carried out;
the time for completing the operation of the engine in a matching way is less than or equal to a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that second non-transient working condition overrun alarm is performed;
the time for completing the matching operation of the engine is greater than a preset operation time threshold, and a shafting torsional vibration signal is greater than or equal to a first non-transient working condition alarm threshold and is smaller than a second non-transient working condition alarm threshold, and a third non-transient working condition overrun alarm is performed;
and (4) the time for completing the matching operation of the engine is greater than a preset operation time threshold, and the shafting torsional vibration signal is greater than a second non-transient working condition alarm threshold, so that a fourth non-transient working condition overrun alarm is performed.
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| CN114689326A (en) * | 2022-03-24 | 2022-07-01 | 潍柴动力股份有限公司 | Engine detection method and detection device |
| CN114993644A (en) * | 2022-05-24 | 2022-09-02 | 潍柴动力股份有限公司 | Failure judgment method, device, equipment and medium for crankshaft torsional vibration damper |
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