CN112697441A - Method and system for detecting upper dead center deviation of piston - Google Patents
Method and system for detecting upper dead center deviation of piston Download PDFInfo
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- CN112697441A CN112697441A CN202011610855.8A CN202011610855A CN112697441A CN 112697441 A CN112697441 A CN 112697441A CN 202011610855 A CN202011610855 A CN 202011610855A CN 112697441 A CN112697441 A CN 112697441A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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Abstract
The application discloses a method and a system for detecting a deviation of an upper dead center of a piston. The method comprises the following steps: driving a flywheel of the engine to rotate according to a preset rotating speed by using a driving device; acquiring a flywheel rotating speed signal output by a rotating speed sensor and acquiring a piston displacement signal output by a displacement sensor; analyzing the flywheel rotation speed signal, determining a first time interval from the starting time to the moment of generating the flywheel top dead center marking signal, analyzing the piston displacement signal, and determining a second time interval from the starting time to the moment of generating the maximum displacement signal; determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval; and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed. Based on the technical scheme disclosed by the application, the deviation between the top dead center of the piston in the engine and the top dead center of the flywheel can be accurately determined, so that the top dead center of the piston can be accurately determined.
Description
Technical Field
The application belongs to the technical field of engines, and particularly relates to a method and a system for detecting deviation of an upper dead center of a piston.
Background
The top dead center of the piston of the engine is an important reference point of the engine, for example, the operation of an oil injection system and an air intake and exhaust system is based on the top dead center of the piston. At present, a top dead center mark of a flywheel of an engine is detected through a rotating speed sensor, and when the top dead center mark of the flywheel rotates to a position right facing the rotating speed sensor, the rotating speed sensor outputs a flywheel top dead center mark signal, so that the piston is determined to move to the top dead center.
However, there may be assembly errors during assembly of the engine, which results in that the piston does not travel to the top dead center when the rotation speed sensor outputs the flywheel top dead center mark signal, and the top dead center of the piston may be advanced or retarded with respect to the top dead center of the flywheel. Therefore, how to determine the deviation between the top dead center of the piston and the top dead center of the flywheel, so as to accurately determine the top dead center of the piston, is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present application provides a method and a system for detecting a top dead center deviation of a piston, so as to accurately determine a deviation between a top dead center of the piston and a top dead center of a flywheel in an engine, thereby accurately determining the top dead center of the piston.
In one aspect, the present application discloses a method of detecting a piston tdc bias, the method comprising:
driving a flywheel of the engine to rotate according to a preset rotating speed by using a driving device;
obtaining a flywheel rotating speed signal output by a rotating speed sensor and obtaining a piston displacement signal output by a displacement sensor, wherein the displacement sensor is positioned above the top of the piston;
analyzing the flywheel rotating speed signal, determining a first time interval from a starting moment to the moment of generating a flywheel top dead center marking signal, analyzing the piston displacement signal, and determining a second time interval from the starting moment to the moment of generating a maximum displacement signal;
determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval;
and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
Optionally, the starting time is the occurrence time of a first tooth signal after the tooth-missing signal in the flywheel rotation speed signal;
the fluted disc of the flywheel comprises a plurality of speed measuring teeth and a tooth missing part, and the plurality of speed measuring teeth are uniformly distributed; when the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth signals, and when the tooth missing portions are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth missing signals.
On the other hand, the application discloses a system for detecting the top dead center deviation of a piston, which comprises a rotating speed sensor, a displacement sensor, a signal processing circuit, a memory and a processor, wherein in the detection process, a driving device is used for driving a flywheel of an engine to rotate according to a preset rotating speed;
the rotation speed sensor is used for detecting the rotation angle of the flywheel and outputting a flywheel rotation speed signal;
the displacement sensor is arranged above the top of the piston and used for detecting the position of the top of the piston and outputting a piston displacement signal;
the signal processing circuit processes a flywheel rotating speed signal output by the rotating speed sensor and a piston displacement signal output by the displacement sensor;
the memory is used for storing the processed flywheel rotating speed signal and the piston displacement signal;
the processor is configured to: analyzing the flywheel rotating speed signal stored in the memory, determining a first time interval from a starting moment to the moment of generating a flywheel top dead center marking signal, analyzing the piston displacement signal stored in the memory, and determining a second time interval from the starting moment to the moment of generating a maximum displacement signal; determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval; and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
Optionally, the fluted disc of the flywheel includes a plurality of speed measuring teeth and a tooth-missing part, and the plurality of speed measuring teeth are uniformly distributed; when the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth signals, and when the tooth missing part is opposite to the rotating speed sensor, the rotating speed sensor outputs tooth missing signals;
the starting time is the occurrence time of the first tooth signal after the tooth missing signal in the flywheel rotating speed signal.
Optionally, the signal processing circuit includes a signal conditioner and an analog-to-digital converter;
the signal conditioner is used for shaping the flywheel rotating speed signal output by the rotating speed sensor;
the analog-to-digital converter is used for performing analog-to-digital conversion on the piston displacement signal output by the displacement sensor.
Optionally, the system further includes a communication module.
Optionally, the system further includes a human-computer interaction module.
Optionally, the driving device is a turning gear or a starter.
Therefore, the beneficial effects of the application are as follows:
the method and the system for detecting the deviation of the top dead center of the piston, which are disclosed by the application, utilize a driving device to drive a flywheel of an engine to rotate according to a preset rotating speed, obtain a flywheel rotating speed signal output by a rotating speed sensor, obtain a piston displacement signal output by a displacement sensor, analyzing the flywheel rotation speed signal and the piston displacement signal, determining a first time interval from the starting moment to the flywheel top dead center marking signal generating moment and a second time interval from the starting moment to the maximum displacement signal generating moment, taking the difference value of the first time interval and the second time interval as the time difference value between the top dead center moment of the flywheel and the top dead center moment of the piston, the angular difference between the top dead center of the piston and the top dead center of the flywheel can be determined according to the time difference and the rotating speed of the flywheel, during the operation of the engine, the top dead center of the piston can be accurately determined according to the angle difference and the rotation angle of the flywheel.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of detecting a top dead center deflection of a piston as disclosed herein;
FIG. 2 is a schematic diagram illustrating a method for detecting a top dead center deflection of a piston according to the present disclosure;
FIG. 3 is a schematic diagram of a system for detecting top dead center deflection of a piston according to the present disclosure;
fig. 4 is a schematic diagram of another system for detecting top dead center deviation of a piston disclosed in the present application.
Detailed Description
The application discloses a method and a system for detecting deviation of a top dead center of a piston, which are used for accurately determining deviation between the top dead center of the piston and the top dead center of a flywheel in an engine, so that the top dead center of the piston is accurately determined.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for detecting a deviation of a top dead center of a piston according to the present disclosure. The method comprises the following steps:
s1: the flywheel of the engine is driven by the driving device to rotate according to the preset rotating speed.
The piston of the engine is connected with the crankshaft through a connecting rod mechanism, and the reciprocating motion of the piston is converted into the rotating motion of the crankshaft under the action of the connecting rod mechanism. In addition, a flywheel is mounted at the rear end of the crankshaft, and the flywheel and the crankshaft rotate synchronously. The flywheel has a large moment of inertia, and the main functions of the flywheel are as follows: part of kinetic energy input into the crankshaft in the power stroke is stored to overcome resistance in other strokes, and the rotation angular speed and the output torque of the crankshaft are ensured to be as uniform as possible.
In the detection process, a flywheel of the engine is driven by the driving device to rotate according to a preset rotating speed, the crankshaft and the flywheel rotate synchronously, and the piston reciprocates under the action of the connecting rod mechanism.
In an implementation, the driving device may be a starter or a turning gear.
S2: and acquiring flywheel rotation speed signals output by the rotation speed sensor and acquiring piston displacement signals output by the displacement sensor.
Wherein the displacement sensor is positioned above the top of the piston.
In the process that the piston does reciprocating motion, the distance between the top of the piston and the displacement sensor changes along with the piston, and a piston displacement signal output by the displacement sensor also changes along with the piston displacement signal. For example: and in the process that the piston moves towards the top dead center, the value of the piston displacement signal output by the displacement sensor is gradually increased, and when the piston moves towards the top dead center, the value of the piston displacement signal reaches the maximum.
The fluted disc of flywheel includes a plurality of teeth that measure the speed, and at the flywheel rotation in-process, the tooth that measures the speed on the fluted disc can rotate to the position relative with speed sensor in proper order. When the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs a pulse signal, so that a flywheel rotating speed signal is formed.
In one possible implementation, the toothed disk of the flywheel comprises a plurality of speed measuring teeth and a tooth-missing part, wherein the plurality of speed measuring teeth are evenly distributed. When the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth signals, and when the tooth missing part is opposite to the rotating speed sensor, the rotating speed sensor outputs tooth missing signals.
Optionally, when the speed measuring teeth are opposite to the speed sensor, the speed sensor outputs a high level signal, and when the tooth missing portions are opposite to the speed sensor, the speed sensor outputs a low level signal.
In addition, the predetermined angle located after the tooth-missing portion in the rotation direction of the flywheel is the top dead center of the flywheel based on the assembly positions of the flywheel and the rotation speed sensor. That is, when the toothless portion rotates to a position opposite to the rotation speed sensor, the rotation speed sensor outputs a toothless signal, and thereafter, when the flywheel continues to rotate by a predetermined angle, it is determined that the top dead center of the flywheel is reached.
The structure of the toothed disc is illustrated here.
The periphery of the fluted disc is uniformly divided into 60 parts, the central angle of each part is 6 degrees, 58 adjacent parts are respectively provided with a speed measuring tooth, 58 speed measuring teeth are arranged totally, and the other 2 adjacent parts are tooth missing parts.
In the implementation, can process 60 speed measuring teeth in the periphery of fluted disc, these 60 speed measuring teeth evenly distributed, set up one speed measuring tooth every 6, later mill 2 adjacent speed measuring teeth except that to form the tooth portion that lacks.
In another possible implementation, the toothed disc of the flywheel comprises a plurality of first speed measuring teeth and one second speed measuring tooth, wherein the plurality of first speed measuring teeth are evenly distributed. When the first speed measuring tooth is opposite to the speed sensor, the speed sensor outputs a first tooth signal, and when the second speed measuring tooth is opposite to the speed sensor, the speed sensor outputs a second tooth signal.
Optionally, the first tacho tooth has a different central angle than the second tacho tooth, which causes the pulse width of the first tooth signal and the second tooth signal to be different. For example, the center angle of the second tachometer tooth is greater than the center angle of the first tachometer tooth, and accordingly, the pulse width of the second tooth signal is greater than the pulse width of the first tooth signal.
In addition, based on the assembly positions of the flywheel and the rotating speed sensor, the preset angle behind the second speed measuring tooth along the rotating direction of the flywheel is the top dead center of the flywheel. That is, when the second tachometer tooth rotates to a position opposite to the rotation speed sensor, the rotation speed sensor outputs a second tooth signal, and then, when the flywheel continues to rotate by a predetermined angle, it is determined that the top dead center of the flywheel is reached.
The structure of the toothed disc is illustrated here.
The periphery of the fluted disc is uniformly divided into 60 parts, the central angle of each part is 6 degrees, 58 adjacent parts are respectively provided with a first speed measuring tooth, 58 first speed measuring teeth are arranged, 2 adjacent parts are respectively provided with a second speed measuring tooth, and the central angle of the second speed measuring tooth is larger than that of the first speed measuring teeth.
In addition, the rotating speed sensor is a Hall rotating speed sensor or a magnetoelectric rotating speed sensor.
S3: the flywheel speed signal is analyzed to determine a first time interval from the start time to the moment of occurrence of the flywheel top dead center marking signal.
S4: the piston displacement signal is analyzed to determine a second time interval from the start time to the time of occurrence of the maximum displacement signal.
As already described above, the predetermined angle after the missing tooth portion or the second tachometer tooth in the rotation direction of the flywheel is the top dead center of the flywheel based on the assembly position of the flywheel and the speed sensor. That is, along the rotation direction of the flywheel, a certain speed measuring tooth located behind the tooth missing part is the top dead center of the flywheel, and then, a tooth signal generated by the speed measuring tooth is a flywheel top dead center marking signal. For example, in the rotation direction of the flywheel, the 4 th speed measurement tooth behind the tooth missing part is the top dead center of the flywheel, and then the 4 th tooth signal appearing behind the tooth missing signal is the flywheel top dead center marking signal. Or, along the rotation direction of the flywheel, a certain first speed measurement tooth located behind the second speed measurement tooth is the top dead center of the flywheel, and then the first tooth signal generated by the first speed measurement tooth is the flywheel top dead center marking signal. For example, in the rotation direction of the flywheel, the 5 th first speed measurement tooth after the second speed measurement tooth is the top dead center of the flywheel, and then the 5 th first tooth signal appearing after the second tooth signal is the flywheel top dead center marking signal.
Optionally, in a case that the fluted disc of the flywheel includes a plurality of speed measuring teeth and a tooth missing part, the initial time is: and the flywheel rotating speed signal is at the occurrence moment of the first tooth signal after the tooth missing signal.
Of course, this is only an example. If the Mth tooth signal occurring after the missing tooth signal is the flywheel top dead center flag signal, the initial time may be: and the value of N is 1,2, … and M-1 at the occurrence moment of the Nth tooth signal after the tooth missing signal in the flywheel rotating speed signal.
Optionally, in a case that the fluted disc of the flywheel includes a plurality of first speed measuring teeth and one second speed measuring tooth, the initial time is: the flywheel rotation speed signal is at the occurrence time of the first tooth signal after the second tooth signal.
Of course, this is only an example. If the mth first tooth signal occurring after the missing tooth signal is the flywheel top dead center mark signal, the initial time may be: and the value of N is 1,2, … and M-1 at the occurrence moment of the Nth first tooth signal after the second tooth signal in the flywheel rotating speed signal.
S5: and determining the time difference between the top dead center moment of the flywheel and the top dead center moment of the piston according to the first time interval and the second time interval.
S6: and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
If the engine has no assembly error, the piston also runs to the top dead center of the piston when the top dead center of the flywheel is reached. Assembly errors of the engine may cause the top dead center of the piston to lead or lag the flywheel top dead center. The flywheel rotation speed signal and the piston displacement signal are then analyzed separately to determine the time interval from the start time to the moment at which the flywheel top dead centre flag signal occurs (denoted as the first time interval), and the time interval from the start time to the moment at which the maximum displacement signal occurs (denoted as the second time interval), and thus the time difference between the top dead centre moment of the flywheel and the top dead centre moment of the piston. Wherein, the time difference between the top dead center moment of the flywheel and the top dead center moment of the piston is as follows: a difference between the first time interval and the second time interval.
Specifically, if the second time interval is greater than the first time interval, it indicates that the piston top dead center lags the flywheel top dead center, and if the second time interval is less than the first time interval, it indicates that the piston top dead center leads the flywheel top dead center.
After the time difference between the top dead center time of the flywheel and the top dead center time of the piston is determined, the rotation speed of the flywheel is combined, and then the angle difference between the top dead center of the piston and the top dead center of the flywheel can be determined. During the operation of the engine, the top dead center of the piston is accurately determined according to the angle of the flywheel and the angle difference.
The method for detecting the deviation of the top dead center of the piston utilizes the driving device to drive the flywheel of the engine to rotate according to the preset rotating speed, obtains the flywheel rotating speed signal output by the rotating speed sensor, obtains the piston displacement signal output by the displacement sensor, analyzing the flywheel rotation speed signal and the piston displacement signal, determining a first time interval from the starting moment to the flywheel top dead center marking signal generating moment and a second time interval from the starting moment to the maximum displacement signal generating moment, taking the difference value of the first time interval and the second time interval as the time difference value between the top dead center moment of the flywheel and the top dead center moment of the piston, the angular difference between the top dead center of the piston and the top dead center of the flywheel can be determined according to the time difference and the rotating speed of the flywheel, during the operation of the engine, the top dead center of the piston can be accurately determined according to the angle difference and the rotation angle of the flywheel.
The method for detecting the top dead center deviation of the piston disclosed in the present application is described below with reference to fig. 2.
The fluted disc of flywheel includes 58 speed measuring teeth and 1 tooth portion of missing. The turning gear is utilized to drive the flywheel to rotate at the rotating speed of 200 r/min. When the tooth that tests the speed rotates to the position relative with rotational speed sensor, rotational speed sensor output high level signal, when the tooth portion that lacks rotates to the position relative with rotational speed sensor, rotational speed sensor output low level signal.
In the process that the piston moves to the top dead center, the value of the piston displacement signal output by the displacement sensor is gradually increased, and when the piston moves to the top dead center, the value of the piston displacement signal reaches the maximum (namely, the maximum displacement signal).
In fig. 2, L1 is a flywheel rotation speed signal output by the rotation speed sensor, and L2 is a piston displacement signal output by the displacement sensor. T0 is the initial time, specifically, the time when the first tooth signal occurs after the missing tooth signal in the flywheel rotational speed signal. T1 is the flywheel top dead center marker signal occurrence time, and T2 is the maximum displacement signal occurrence time. The first time interval is determined from T0 and T1, and the second time interval is determined from T0 and T2. Then, a difference between the first time interval and the second time interval is calculated, which is a time difference between the top dead center time of the flywheel and the top dead center time of the piston. Wherein if the second time interval is greater than the first time interval, indicating that the piston top dead center lags the flywheel top dead center, and if the second time interval is less than the first time interval, indicating that the piston top dead center leads the flywheel top dead center. The angular difference between the top dead center of the piston and the top dead center of the flywheel can be calculated by utilizing the time difference and the rotating speed of the flywheel.
During the running process of the engine, the top dead center of the piston can be accurately determined according to the rotation angle of the flywheel and the predetermined angle difference between the top dead center of the piston and the top dead center of the flywheel.
The application discloses a method for detecting the top dead center deviation of the piston, and correspondingly, the application also discloses a system for detecting the top dead center deviation of the piston.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a system for detecting a top dead center deviation of a piston according to the present disclosure. The system comprises: a rotation speed sensor 10, a displacement sensor 20, a signal processing circuit 30, a memory 30 and a processor 40.
In the detection process, a driving device is utilized to drive a flywheel of the engine to rotate according to a preset rotating speed.
Wherein, the driving device can be a starter or a turning gear.
The rotation speed sensor 10 is used for detecting the rotation angle of the flywheel and outputting a flywheel rotation speed signal.
The displacement sensor 20 is installed above the top of the piston, and is used for detecting the position of the top of the piston and outputting a piston displacement signal.
The signal processing circuit 30 is used for processing the flywheel rotation speed signal output by the rotation speed sensor 10 and the piston displacement signal output by the displacement sensor 20.
The memory 40 is used for storing the flywheel rotation speed signal and the piston displacement signal processed by the signal processing circuit 30.
The processor 50 is configured to: analyzing the flywheel rotation speed signal stored in the memory 40, determining a first time interval from a starting time to a moment of occurrence of a flywheel top dead center marking signal, analyzing the piston displacement signal stored in the memory 40, and determining a second time interval from the starting time to the moment of occurrence of a maximum displacement signal; determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval; and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
The application discloses a system for detecting the deviation of the top dead center of a piston, a flywheel of an engine is driven by a driving device to rotate according to a preset rotating speed, a rotating speed sensor detects the rotating angle of the flywheel and outputs a flywheel rotating speed signal, a displacement sensor detects the position of the top of the piston and outputs a piston displacement signal, a signal processing circuit processes the flywheel rotating speed signal output by the rotating speed sensor and the piston displacement signal output by the displacement sensor and then stores the flywheel rotating speed signal and the piston displacement signal into a memory, a processor analyzes the flywheel rotating speed signal and the piston displacement signal after processing, determines a first time interval from an initial moment to the occurrence moment of a flywheel top dead center marking signal and a second time interval from the initial moment to the occurrence moment of a maximum displacement signal, and takes the difference value of the first time interval and the second time interval as the time difference value between the top dead center moment of the flywheel and the top dead, and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the rotating speed of the flywheel, and accurately determining the top dead center of the piston according to the angle difference and the rotating angle of the flywheel in the running process of the engine.
In one possible implementation, the toothed disk of the flywheel comprises a plurality of speed measuring teeth and a tooth-missing part, wherein the plurality of speed measuring teeth are evenly distributed. When the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor 10 outputs tooth signals, and when the tooth missing part is opposite to the rotating speed sensor, the rotating speed sensor 10 outputs tooth missing signals.
Optionally, the initial time is: and the flywheel rotating speed signal is at the occurrence moment of the first tooth signal after the tooth missing signal.
In another possible implementation, the toothed disc of the flywheel comprises a plurality of first speed measuring teeth and one second speed measuring tooth, wherein the plurality of first speed measuring teeth are evenly distributed. When the first speed measuring tooth is opposite to the speed sensor, the speed sensor outputs a first tooth signal, and when the second speed measuring tooth is opposite to the speed sensor, the speed sensor outputs a second tooth signal.
Optionally, the initial time is: the flywheel rotation speed signal is at the occurrence time of the first tooth signal after the second tooth signal.
In one embodiment, the signal processing circuit 30 comprises a signal conditioner 301 and an analog-to-digital converter 302, as shown in fig. 4.
The signal conditioner 301 is configured to shape the flywheel rotation speed signal output by the rotation speed sensor 10.
The analog-to-digital converter 302 is used for analog-to-digital converting the piston displacement signal output by the displacement sensor 20.
In addition, a communication module 60 and/or a human-computer interaction module 70 may be further provided in the system, as shown in fig. 4.
The system performs data interaction with other devices through the communication module 60. For example, the system sends the angle difference between the top dead center of the piston and the top dead center of the flywheel to the upper computer through the communication module 60, and the system receives a control command sent by the upper computer through the communication module 60.
Optionally, the human-computer interaction module 70 is a touch screen. The processor 40 determines the angular difference between the top dead center of the piston and the top dead center of the flywheel, which is displayed via the touch screen. In addition, the user can input a control instruction through the touch screen.
Optionally, the human-computer interaction module 70 includes a display screen and function keys. The processor 40 determines the angular difference between the top dead center of the piston and the top dead center of the flywheel, which is displayed via the display screen. In addition, the user can input a control instruction through the function key.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 (8)
1. A method of detecting a piston top dead center deviation, the method comprising:
driving a flywheel of the engine to rotate according to a preset rotating speed by using a driving device;
obtaining a flywheel rotating speed signal output by a rotating speed sensor and obtaining a piston displacement signal output by a displacement sensor, wherein the displacement sensor is positioned above the top of the piston;
analyzing the flywheel rotating speed signal, determining a first time interval from a starting moment to the moment of generating a flywheel top dead center marking signal, analyzing the piston displacement signal, and determining a second time interval from the starting moment to the moment of generating a maximum displacement signal;
determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval;
and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
2. The method of claim 1, wherein the start time is a time of occurrence of a first tooth signal after a missing tooth signal in the flywheel speed signal;
the fluted disc of the flywheel comprises a plurality of speed measuring teeth and a tooth missing part, and the plurality of speed measuring teeth are uniformly distributed; when the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth signals, and when the tooth missing portions are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth missing signals.
3. A system for detecting the deviation of the top dead center of a piston is characterized by comprising a rotating speed sensor, a displacement sensor, a signal processing circuit, a memory and a processor, wherein in the detection process, a driving device is used for driving a flywheel of an engine to rotate according to a preset rotating speed;
the rotation speed sensor is used for detecting the rotation angle of the flywheel and outputting a flywheel rotation speed signal;
the displacement sensor is arranged above the top of the piston and used for detecting the position of the top of the piston and outputting a piston displacement signal;
the signal processing circuit processes a flywheel rotating speed signal output by the rotating speed sensor and a piston displacement signal output by the displacement sensor;
the memory is used for storing the processed flywheel rotating speed signal and the piston displacement signal;
the processor is configured to: analyzing the flywheel rotating speed signal stored in the memory, determining a first time interval from a starting moment to the moment of generating a flywheel top dead center marking signal, analyzing the piston displacement signal stored in the memory, and determining a second time interval from the starting moment to the moment of generating a maximum displacement signal; determining a time difference value between the top dead center time of the flywheel and the top dead center time of the piston according to the first time interval and the second time interval; and determining the angle difference between the top dead center of the piston and the top dead center of the flywheel according to the time difference and the preset rotating speed.
4. The system of claim 3, wherein the toothed disc of the flywheel comprises a plurality of speed measuring teeth and a tooth missing part, and the plurality of speed measuring teeth are uniformly distributed; when the speed measuring teeth are opposite to the rotating speed sensor, the rotating speed sensor outputs tooth signals, and when the tooth missing part is opposite to the rotating speed sensor, the rotating speed sensor outputs tooth missing signals;
the starting time is the occurrence time of the first tooth signal after the tooth missing signal in the flywheel rotating speed signal.
5. The system of claim 4, wherein the signal processing circuitry comprises a signal conditioner and an analog-to-digital converter;
the signal conditioner is used for shaping the flywheel rotating speed signal output by the rotating speed sensor;
the analog-to-digital converter is used for performing analog-to-digital conversion on the piston displacement signal output by the displacement sensor.
6. The system of claim 3, further comprising a communication module.
7. The system of claim 6, further comprising a human-machine interaction module.
8. The system of claim 3, wherein the drive device is a turning gear or a starter.
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