CN213067511U - Engine valve clearance detection device and engine abnormity judgment system - Google Patents
Engine valve clearance detection device and engine abnormity judgment system Download PDFInfo
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- CN213067511U CN213067511U CN202022406229.9U CN202022406229U CN213067511U CN 213067511 U CN213067511 U CN 213067511U CN 202022406229 U CN202022406229 U CN 202022406229U CN 213067511 U CN213067511 U CN 213067511U
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Abstract
The embodiment of the application provides an engine valve clearance detection device and engine abnormity judgement system, includes: the first acquisition module is used for acquiring displacement information of a valve of the engine; the second acquisition module is used for acquiring the position information of the camshaft of the engine; the processing module is connected with the first acquisition module and the second acquisition module and used for receiving the displacement information and the position information and determining the valve clearance value of the engine based on the displacement information and the position information.
Description
Technical Field
The application relates to the technical field of engine detection, and relates to but is not limited to an engine valve clearance detection device and an engine abnormity judgment system.
Background
The valve clearance value of the engine is a key parameter of engine assembly, and the valve clearance exists because the intake valve and the exhaust valve are both arranged at the top end of the combustion chamber and are the highest temperature part, and in order to leave an expansion space, the clearance must be reserved. The clearance is too big, and the intake valve, the exhaust valve is opened later, has shortened the intake and exhaust time, has reduced the opening height of valve, has changed normal distribution phase, makes the engine because of admitting air not enough, and the exhaust is not clean and the power descends, in addition, still makes the striking of valve mechanism part increase, and the wearing and tearing are accelerated. The clearance is too small, after the engine works, parts are heated and expanded to push the valve open, so that the valve is not closed tightly, air leakage is caused, power is reduced, the sealing surface of the valve is seriously deposited with carbon or burnt out, and even the valve impacts a piston.
In the related art, the valve clearance detection is manually performed, for example, a worker measures a specific valve clearance value by using a feeler gauge, the worker uses a non-stop gauge to respectively confirm whether the valve clearance is smaller than an upper limit value for intake and exhaust, and uses a go gauge to confirm whether the valve clearance is larger than a lower limit value. However, in the related art, when the measurement is performed manually, manual operation experience is relied on, the values of the boundary area are inconsistent due to different insertion forces of the measurement tool, and the detected values cannot be automatically filed, which is not beneficial to the tracing and analysis of quality problems.
Disclosure of Invention
In view of the above problems, the present application provides an engine valve clearance detection device and an engine abnormality determination device.
The application provides an engine valve clearance detection device, includes:
the first acquisition module is used for acquiring displacement information of a valve of the engine;
the second acquisition module is used for acquiring the position information of a camshaft of the engine;
and the processing module is connected with the first acquisition module and the second acquisition module and used for determining the valve clearance value of the engine based on the displacement information and the position information.
In some embodiments, the first acquisition module is disposed at a bottom of the damper.
In some embodiments, the second collecting module is disposed on one side of a station driving shaft of a station dragging mechanism, wherein the station dragging mechanism is configured to drive the station driving shaft to drive the cam shaft to rotate.
In some embodiments, the engine valve lash detection device further includes:
and the database is connected with the processing module and at least used for storing the valve clearance value.
In some embodiments, the database comprises a programmable logic controller.
In some embodiments, the first acquisition module comprises a displacement sensor.
In some embodiments, the second acquisition module comprises a shaft encoder.
In some embodiments, the processing module is integrated with the storage module.
The embodiment of the application also provides an engine abnormity judgment system, which comprises any one of the engine valve clearance detection devices;
and the judging module is used for determining a comparison result according to the valve clearance value of the engine determined by the processing module and the valve clearance reference value and determining a judging result whether the engine is normal or not based on the comparison result.
In some embodiments, the engine abnormality determination system further includes:
and the execution module is connected with the judgment module and used for adding label information to the transmitter based on the judgment result.
According to the engine valve clearance detection device and the engine abnormity judgment system, the first acquisition module is arranged to acquire displacement information of a valve, and the second acquisition module is arranged to acquire position information of a camshaft; the processing module determines the valve clearance value of the engine based on the displacement information and the position information, so that the valve clearance value can be rapidly acquired, and the detection efficiency and the detection precision are improved.
Drawings
The present application will be described in more detail below on the basis of embodiments and with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an engine valve lash detection system provided in an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a relationship between a valve stroke and a valve clearance according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another engine valve lash detection system provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a transmitter abnormality determination system according to an embodiment of the present application.
Detailed Description
The following detailed description will be provided with reference to the accompanying drawings and embodiments, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and various features in the embodiments of the present application can be combined with each other without conflict, and the formed technical solutions are all within the scope of protection of the present application.
The application provides an engine valve clearance detection device, figure 1 is the structure schematic diagram of the engine valve clearance detection device that this application embodiment provided, as shown in figure 1, shown engine valve clearance detection device includes: a first acquisition module 101, a second acquisition module 102 and a processing module 103; the first acquisition module 101 is used for acquiring displacement information of a valve of an engine; the second acquisition module 102 is used for acquiring position information of a camshaft of the engine; a processing module 103 is connected to the first acquisition module 101 and the second acquisition module 102, and the processing module 103 is configured to determine a valve clearance value of the engine based on the displacement information and the position information.
According to the engine valve clearance detection device, the first acquisition module 101 is arranged to acquire displacement information of a valve, and the second acquisition module 102 is arranged to acquire position information of a camshaft; the processing module 103 determines the valve clearance value of the engine based on the displacement information and the position information, so that the valve clearance value can be rapidly acquired, and the detection efficiency and the detection precision are improved.
In the embodiment of the application, the engine valve clearance detection device can not be influenced by the emotion and physical ability of an operator when the engine valve is detected.
In the embodiment of the present application, the position information of the camshaft may be position information of a row line of the camshaft, and before the detection is performed, a program of the measurement software needs to be stored in the processing module.
In the embodiment of the present application, because there is a fixed relationship between the valve stroke (i.e. the displacement information in the above embodiment) of the same type of engine, the position information of the camshaft and the valve clearance, in the embodiment of the present application, the position information of the camshaft may be the row line height, the valve stroke may be set to be Y, the row line height is m (angle), the valve clearance value is X, and the scaling factor is K, then the fixed relationship may be expressed as formula (1):
Y＝K*M(angle)–X (1)；
since the stroke line height is fixed at any one determined position on the camshaft stroke line, equation (1) can be set to a constant value (0 ° to 360 °), and m (Angle) can be set to a fixed constant value, and equation (1) becomes a linear relationship between the valve stroke Y and the valve clearance value X, as shown in equation (2):
Y＝A–X (2)；
wherein the value of a in equation (2) is constant.
Based on the above formula (2), the following steps are adopted to determine the accurate relational expression of the valve stroke Y and the valve clearance value X, in the embodiment of the present application, the intake valve and the exhaust valve are in the same calculation mode, and here, taking the intake valve as an example for explanation, the determination of the accurate relational expression of the valve stroke Y and the valve clearance value X includes:
step S1, an intake valve clearance value X is set1The station dragging mechanism drags the engine crankshaft to drive the camshaft to rotate, and the intake and exhaust circulation processes are continuously opened, and the intake and exhaust are measuredAir side valve travel Y1Maximum value of (d);
step S2, the valve clearance value X is changed2Xn, measuring the maximum valve stroke Y according to step S12Yn, so as to obtain n groups of corresponding data of the valve stroke Y and the valve clearance X;
in the embodiment of the present application, through a plurality of tests, a plurality of sets (X, Y) are obtained, fig. 2 is a schematic diagram of a relationship between a valve stroke and a valve clearance provided in the embodiment of the present application, and as shown in fig. 2, a unary linear equation may be determined in a coordinate system through the plurality of sets (X, Y).
In step S3, a unary linear equation for calculating the valve stroke and the valve clearance is determined based on the n-sets of corresponding data, see formula (3):
Y＝a*X+b (3)；
and (3) compiling measurement software according to the obtained formula (3), setting the sampling frequency to be 100Hz, and obtaining the maximum valve stroke Y when the camshaft rotates so as to obtain the valve clearance value X of each engine.
In the embodiment of the present application, the connection between the processing module and the first acquisition module and the connection between the processing module and the second acquisition module may be an electrical connection or a wireless communication connection.
In some embodiments, the first acquisition module is disposed opposite a bottom of the damper.
In some embodiments, the second collecting module is disposed on one side of a station driving shaft of a station dragging mechanism, wherein the station dragging mechanism is configured to drive the station driving shaft to drive the cam shaft to rotate.
In the embodiment of the application, the motion of the station driving shaft is acquired through the second acquisition module, and the position information of the cam shaft can be determined based on the relation between the station driving shaft and the cam shaft.
In some embodiments, the engine valve lash detection system further comprises:
and the storage module is connected with the processing module and at least used for storing the valve clearance value.
In the embodiment of the application, the engine construction information and the valve clearance value can be stored in the storage module, so that subsequent analysis is facilitated.
In some embodiments, the processing module is further configured to determine a detection result based on the valve clearance value and a valve clearance reference value. In the embodiment of the application, when the valve clearance value is within the valve clearance reference value range, the valve clearance detection of the engine is determined to be qualified, and when the valve clearance value is out of the valve clearance reference value range, the valve clearance detection of the engine is determined to be unqualified.
In some embodiments, the processing module is further configured to send the detection result to a storage module. In an embodiment of the present application, the storage module includes a programmable logic controller.
In some embodiments, the first acquisition module comprises a displacement sensor.
Illustratively, the displacement sensor may be a Solartron brand LVDT sensor.
In some embodiments, the second acquisition module is a shaft encoder.
In the embodiment of the application, the processing module and the storage module are integrated together.
In some implementations, to improve the adaptability of the detection system and eliminate the mechanical tolerance effect, the valve stroke of step S3 may be set according to Δ Y-Ymax-Y0And replacing and fitting the relation curve of the delta Y and the valve stroke again.
Fig. 3 is a schematic structural diagram of another engine valve detection system provided in this embodiment, as shown in fig. 3, in this embodiment of the present application, after an engine is in place, a valve 303 is arranged opposite to a probe of a first acquisition module 302, a Programmable Logic Controller 301 (PLC) sends a measurement start signal, a station dragging mechanism simulates engine operation, the first acquisition module 302 installed below an intake valve and an exhaust valve measures a process displacement of the valve 303 in real time, and an industrial computer 304(IPC) obtains an initial valve stroke Y based on a determination rule0And the maximum valve stroke Ymax, thereby obtaining the valve stroke variation amount Δ Y. In the embodiment of the present application, Δ Y may be substituted into a preset relationship as shown in formula (4):
ΔY＝a1*X+b1 (4)；
thus, the actual valve clearance value X of the current engine is obtained, wherein a1、b1Is a constant.
An engine abnormality determination system according to an embodiment of the present application is provided, and fig. 4 is a schematic structural diagram of a transmitter abnormality determination system according to an embodiment of the present application, and as shown in fig. 4, the engine abnormality determination system includes any one of the engine valve clearance detection devices described above, and a determination module 104, where the determination module 104 is configured to determine a comparison result according to a valve clearance value of an engine determined by the processing module and a valve clearance reference value, and determine a determination result of whether the engine is normal based on the comparison result.
In the embodiment of the application, the determining module 104 is configured to determine a normal determining result of the engine when the comparison result indicates that the valve clearance value is within the valve clearance reference value range, and determine an abnormal determining result of the engine when the comparison result indicates that the valve clearance value is not within the valve clearance reference value range.
In some embodiments, the engine abnormality determination system further includes:
and the execution module is connected with the judgment module and used for attaching label information to the transmitter based on the judgment result.
In the embodiment of the application, when the judgment result of the engine abnormity is determined, the execution module adds an abnormity label. When the engine is determined to be normal, the execution module adds a normal tag to the engine.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one second processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (10)
1. An engine valve clearance detection apparatus, characterized by comprising:
the first acquisition module is used for acquiring displacement information of a valve of the engine;
the second acquisition module is used for acquiring the position information of the camshaft of the engine;
and the processing module is connected with the first acquisition module and the second acquisition module and used for determining the valve clearance value of the engine based on the displacement information and the position information.
2. The engine valve lash detection device of claim 1, wherein the first acquisition module is disposed at a bottom of the valve.
3. The engine valve clearance detection device according to claim 1, wherein the second acquisition module is disposed on a side of a station driving shaft of a station dragging mechanism, wherein the station dragging mechanism is configured to drive the station driving shaft to rotate the camshaft.
4. The engine valve lash detection device according to claim 1, characterized by further comprising:
and the storage module is connected with the processing module and at least used for storing the valve clearance value.
5. The engine valve lash detection device of claim 4, wherein the memory module includes a programmable logic controller.
6. The engine valve lash detection device of claim 1, wherein the first acquisition module includes a displacement sensor.
7. The engine valve lash detection device of claim 1, wherein the second acquisition module includes a shaft angle encoder.
8. The engine valve lash detection device of claim 4, wherein the processing module is integrated with the memory module.
9. An engine abnormality determination system comprising the engine valve clearance detection device according to any one of claims 1 to 8;
and the judging module is used for determining a comparison result according to the valve clearance value of the engine determined by the processing module and the valve clearance reference value and determining a judging result whether the engine is normal or not based on the comparison result.
10. The transmitter abnormality determination system according to claim 9, characterized in that the engine abnormality determination system further includes:
and the execution module is connected with the judgment module and used for adding label information to the transmitter based on the judgment result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022406229.9U CN213067511U (en) | 2020-10-26 | 2020-10-26 | Engine valve clearance detection device and engine abnormity judgment system |
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| CN202022406229.9U CN213067511U (en) | 2020-10-26 | 2020-10-26 | Engine valve clearance detection device and engine abnormity judgment system |
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| CN213067511U true CN213067511U (en) | 2021-04-27 |
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