CN110375905B - Engine valve spring force measuring equipment, method and device - Google Patents
Engine valve spring force measuring equipment, method and device Download PDFInfo
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- CN110375905B CN110375905B CN201810322567.9A CN201810322567A CN110375905B CN 110375905 B CN110375905 B CN 110375905B CN 201810322567 A CN201810322567 A CN 201810322567A CN 110375905 B CN110375905 B CN 110375905B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a measuring device, a method and a device for the spring force of an engine valve, wherein the measuring device comprises an operating condition simulation device, a corner sensor, a valve spring, a strain gauge, a signal cable and a measuring device; and an included angle between the grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range. Therefore, the strain signal of the valve spring under the condition of simulating the operation boundary of the engine valve mechanism can be directly obtained by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the obtained valve spring force is closer to the actual condition and more accurate.
Description
Technical Field
The invention relates to the technical field of engine testing, in particular to a device, a method and a device for measuring the spring force of an engine valve.
Background
The engine air distribution system is an important system in an automobile engine system, wherein a valve spring is one of key components of the engine air distribution system, and the valve spring has the functions of ensuring that a valve is seated in time and is tightly attached to the valve spring, and preventing the sealing performance of a cylinder from being reduced due to valve jumping. When the rigidity of the valve spring is suitable for the engine, the requirements of the dynamic response of the valve seating and other functions can be met, and the influence of excessive friction loss on the economy, reliability and the like of the engine can be avoided. Therefore, in order to adapt the stiffness of the developed valve spring to the engine, the dynamic stress of the valve spring needs to be measured when the valve spring is designed and developed.
At present, the research mode of dynamic stress of an engine valve spring is mainly as follows: when the engine valve mechanism operates, the valve spring influences the rocker arm, namely, the rocker arm generates strain under the action of the valve spring, and the magnitude of the valve spring force is indirectly reflected by measuring the strain of the rocker arm.
However, the inventor finds that, according to the measured strain of the rocker arm under the action of the valve spring, the magnitude of the valve spring force is reversely deduced, and ignores that the strain of the rocker arm is not only generated by the action of the valve spring under some operation conditions, for example, the strain of the rocker arm can be caused by the temperature change of the rocker arm, the oil pressure change and the like, namely, the strain of the rocker arm does not reflect the magnitude of the valve spring force, so that the valve spring force indirectly reflected by measuring the strain of the rocker arm does not accord with the actual condition, and a large error exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device, a method and a device for measuring the valve spring force of an engine, which can directly measure the strain condition of a valve spring under the operation boundary condition of an engine valve mechanism, so that the obtained valve spring force is closer to the actual condition and more accurate.
In a first aspect, an embodiment of the present invention provides an engine valve spring force measuring apparatus, including:
the device comprises an operating condition simulation device, a corner sensor, a valve spring, a strain gauge, a signal cable and a measuring device, wherein the operating condition simulation device is connected with the valve spring and the corner sensor, the corner sensor is connected with the measuring device, the strain gauge is directly adhered to the outer surface of a spring wire of the valve spring and is connected with the signal cable, and the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measuring device; an included angle between a grid wire of the strain gauge and the axis of a spring wire of the valve spring is within a preset range;
the running condition simulation device is used for simulating the running boundary condition of the valve actuating mechanism of the engine according to the test program;
the rotation angle sensor is used for measuring a rotation angle signal of the motor and a rotation angle signal of the cam shaft and sending the rotation angle signals to the measuring device;
the valve spring is used for generating strain under the operation boundary condition of the engine valve mechanism;
the strain gauge is used for measuring a strain signal of the valve spring generating strain and transmitting the strain signal to the signal cable;
the signal cable is used for transmitting a strain signal of the valve spring to the measuring device;
the measuring device is used for obtaining valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation between the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, and the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press machine.
Preferably, an included angle between the grid wire of the strain gauge and the spring wire axis of the valve spring is 45 degrees.
Preferably, the operational boundary conditions of the engine valve train include oil pressure, oil temperature and fuel pressure.
Preferably, the strain gauge is a high temperature resistant strain gauge having a width of less than 2 mm.
Preferably, the signal cable is high temperature resistant, oil resistant and has a cross section area smaller than 0.1mm2The signal cable of (2).
In a second aspect, an embodiment of the present invention provides a method for measuring a spring force of an engine valve, including:
acquiring a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition by using a preset sampling frequency, wherein the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range;
and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation among the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, wherein the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press.
Preferably, the preset sampling frequency is 15 kHz.
Preferably, an included angle between the grid wire of the strain gauge and the spring wire axis of the valve spring is 45 degrees.
Preferably, the obtaining a valve spring force corresponding to a phase angle signal of a camshaft according to a corresponding relationship between a rotation angle signal of the motor, a rotation angle signal of the camshaft, a strain signal of the strain gauge, and a spring force includes:
obtaining a phase angle signal of the cam shaft according to the rotation angle signal of the motor and the rotation angle signal of the cam shaft;
and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the strain signal of the strain gauge and the corresponding relation between the strain signal and the spring force.
In a third aspect, an embodiment of the present invention provides an apparatus for measuring a spring force of an engine valve, including:
the device comprises an acquisition unit, a signal processing unit and a signal processing unit, wherein the acquisition unit is used for acquiring a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition at a preset sampling frequency, the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range;
and the obtaining unit is used for obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation between the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, and the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press machine.
Compared with the prior art, the invention has at least the following advantages:
by adopting the technical scheme of the embodiment of the invention, the measuring equipment of the valve spring force of the engine comprises an operating condition simulation device, a corner sensor, a valve spring, a strain gauge, a signal cable and a measuring device, wherein the operating condition simulation device is connected with the valve spring and the corner sensor, the corner sensor is connected with the measuring device, the strain gauge is directly adhered to the outer surface of a spring wire of the valve spring and is connected with the signal cable, and the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measuring device; and an included angle between the grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range. The running condition simulation device simulates the running boundary condition of the engine valve mechanism according to the test program; the measuring device acquires a rotation angle signal of a motor and a rotation angle signal of a cam shaft through the rotation angle sensor, and acquires a strain signal of the valve spring generating strain under the operation boundary condition of the engine valve mechanism through the strain gauge connected with the signal cable; and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the three signals and the corresponding relation between the strain signal and the spring force. Therefore, strain signals of the valve spring under the condition of simulating the operation boundary of an engine valve mechanism can be directly acquired by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the acquired valve spring force is closer to the actual condition and more accurate.
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 described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an apparatus for measuring a spring force of an engine valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grid wire structure of a strain gauge provided in an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for measuring engine valve spring force according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for measuring a valve spring force of an engine according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
The valve spring of the engine gas distribution system is a key component of the valve spring, and the valve spring has the functions of ensuring that the valve is seated and tightly attached in time and preventing the valve from jumping to cause the reduction of the sealing performance of the cylinder. In order to enable the rigidity of the developed valve spring to be suitable for the engine, the requirements of functions such as dynamic response of valve seating are met, and meanwhile, the influence of excessive friction loss on the economy and reliability of the engine can be avoided. Therefore, when designing and developing the valve spring, the dynamic stress of the valve spring needs to be measured.
At present, the following research modes are available for the dynamic stress of an engine valve spring: in the first mode, finite element analysis is performed by Computer Aided Engineering (CAE) valve spring, that is, mass points are divided by modeling the valve spring; in the second mode, the valve spring is tested on a fatigue endurance testing machine independently; in the third mode, when the valve mechanism of the engine runs, the valve spring influences the rocker arm, namely, the rocker arm generates strain under the action of the valve spring, and the magnitude of the valve spring force is indirectly reflected by measuring the strain of the rocker arm.
However, the inventor finds that, for the first mode and the second mode, the influence of the valve spring on other components and boundary conditions in the valve train is ignored, and the measured valve spring force has a larger difference from the actual valve spring force; for the third mode, it is ignored that the strain of the rocker arm under some operating conditions is not only caused by the action of the valve spring, for example, the strain of the rocker arm can be caused by the temperature change of the rocker arm itself, the oil pressure change and the like, that is, the strain of the rocker arm does not reflect the magnitude of the valve spring force, so that the valve spring force indirectly reflected by measuring the strain of the rocker arm does not conform to the actual condition, and a large error exists.
In order to solve the problem, in the embodiment of the invention, the measuring device for the valve spring force of the engine comprises an operating condition simulation device, a rotation angle sensor, a valve spring, a strain gauge, a signal cable and a measuring device, wherein the operating condition simulation device is connected with the valve spring and the rotation angle sensor, the rotation angle sensor is connected with the measuring device, the strain gauge is directly adhered to the outer surface of a spring wire of the valve spring and is connected with the signal cable, and the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measuring device; and an included angle between the grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range. The running condition simulation device simulates the running boundary condition of the engine valve mechanism according to the test program; the measuring device acquires a rotation angle signal of a motor and a rotation angle signal of a cam shaft through the rotation angle sensor, and acquires a strain signal of the valve spring generating strain under the operation boundary condition of the engine valve mechanism through the strain gauge connected with the signal cable; and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the three signals and the corresponding relation between the strain signal and the spring force. Therefore, strain signals of the valve spring under the condition of simulating the operation boundary of an engine valve mechanism can be directly acquired by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the acquired valve spring force is closer to the actual condition and more accurate.
The following describes a detailed implementation manner of a method and a device for measuring the spring force of an engine valve in the embodiment of the invention by using an embodiment with reference to the attached drawings.
Exemplary device
Referring to fig. 1, a schematic structural diagram of an engine valve spring force measuring apparatus according to an embodiment of the present invention is shown. In this embodiment, the apparatus may include, for example, the following:
the device comprises an operating condition simulation device 101, a rotation angle sensor 102, a valve spring 103, a strain gauge 104, a signal cable 105 and a measuring device 106, wherein the operating condition simulation device 101 is connected with the valve spring 103 and the rotation angle sensor 102, the rotation angle sensor 102 is connected with the measuring device 106, the strain gauge 104 is directly adhered to the outer surface of a spring wire of the valve spring 103 and is connected with the signal cable 105, and the signal cable 105 is arranged along the outer surface of the spring wire of the valve spring 103 and is connected with the measuring device 106; an included angle between a grid wire of the strain gauge 104 and a spring wire axis of the valve spring 103 is within a preset range;
the running condition simulation device 101 is used for simulating the running boundary conditions of the valve actuating mechanism of the engine according to the test program;
the rotation angle sensor 102 is configured to measure a rotation angle signal of the motor and a rotation angle signal of the camshaft, and send the rotation angle signals to the measuring device 106;
the valve spring 103 is used for generating strain under the operation boundary condition of the engine valve mechanism;
the strain gauge 104 is used for measuring a strain signal of the valve spring 103 generating strain and transmitting the strain signal to the signal cable 105;
the signal cable 105 is used for transmitting a strain signal of the valve spring 103 to the measuring device 106;
the measuring device 106 is configured to obtain a valve spring force corresponding to a phase angle signal of the camshaft according to a corresponding relationship between a rotation angle signal of the motor, a rotation angle signal of the camshaft, and a strain signal of the valve spring 103 and the spring force, where the corresponding relationship between the strain signal and the spring force is calibrated in advance by a standard press.
It is understood that, in order to directly measure the strain of the valve spring 103 under the simulated operation boundary conditions of the engine valve train, the strain gauge 104 is directly adhered to the outer surface of the spring wire of the valve spring 103 and connected to the measuring device 106 through the signal cable 105, so that the measuring device 106 can obtain the strain signal of the valve spring 103 directly measured by the strain gauge 104 through the signal cable 105. Therefore, the operation boundary conditions of the engine valve train are simulated, and the strain condition of the valve spring can be directly measured, so that the valve spring force obtained according to the strain signal of the valve spring 103 is closer to the actual condition and more accurate. In order to enable the valve spring 103 to change rapidly in the valve train when the engine runs at a high speed, and not to influence the change of the valve spring 103 and to better transmit the strain signal, the signal cable 105 is arranged along the outer surface of the spring wire of the valve spring 103. An included angle between the grid wire of the strain gauge 104 and the wire axis of the valve spring 103 is within a preset range, so as to ensure that the strain signal of the valve spring 103 measured by the strain gauge 104 is accurate.
It should be noted that, since the strain gauge 104 is directly adhered to the outer surface of the spring wire of the valve spring 103, it can be known from many experiments that when the included angle between the gate wire of the strain gauge 104 and the axis of the spring wire of the valve spring 103 is 45 °, the strain signal of the valve spring 103 measured by the strain gauge 104 is strongest and most accurate. For example, fig. 2 shows a schematic grid wire structure of a strain gauge, wherein the grid wire of the strain gauge forms an angle of 45 ° with the horizontal axis.
It should be noted that the main parameters of the valve train during engine operation are oil pressure, oil temperature and fuel pressure, and therefore, in order to accurately measure the valve spring force during engine operation, it is necessary to simulate the oil pressure, oil temperature and fuel pressure in the valve train during engine operation, that is, to simulate the operation boundary conditions of the valve train during engine operation. Thus, in this embodiment, the operational boundary conditions of the engine valve train include oil pressure, oil temperature, and fuel pressure.
It should be noted that, because the diameter of the spring wire of the valve spring 103 generally installed in the valve train of the engine is small, and the temperature of the engine oil in the valve train is high when the engine runs at a high speed, the strain gauge 104 directly adhered to the outer surface of the spring wire of the valve spring 103 should have the characteristics of high temperature resistance and small width. Therefore, in the present embodiment, the strain gauge 104 is a strain gauge 104 that is resistant to high temperature and has a width of less than 2 mm.
Similarly, it should be noted that, in order to facilitate the arrangement of the signal cable 105 along the outer surface of the spring wire of the valve spring 103, the signal cable 105 should have a characteristic of small cross-sectional area; also, the signal cable 105 should have high temperature and oil resistance due to the characteristics of oil and fuel. Therefore, in this embodimentIn an embodiment, the signal cable 105 is high temperature resistant, oil resistant, and has a cross-sectional area less than 0.1mm2The signal cable 105.
Through various implementation manners provided by the embodiment, the measuring equipment for the valve spring force of the engine comprises an operating condition simulation device, a rotation angle sensor, a valve spring, a strain gauge, a signal cable and a measuring device, wherein the operating condition simulation device is connected with the valve spring and the rotation angle sensor, the rotation angle sensor is connected with the measuring device, the strain gauge is directly adhered to the outer surface of a spring wire of the valve spring and is connected with the signal cable, and the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measuring device; and an included angle between the grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range. The running condition simulation device simulates the running boundary condition of the engine valve mechanism according to the test program; the measuring device acquires a rotation angle signal of a motor and a rotation angle signal of a cam shaft through the rotation angle sensor, and acquires a strain signal of the valve spring generating strain under the operation boundary condition of the engine valve mechanism through the strain gauge connected with the signal cable; and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the three signals and the corresponding relation between the strain signal and the spring force. Therefore, strain signals of the valve spring under the condition of simulating the operation boundary of an engine valve mechanism can be directly acquired by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the acquired valve spring force is closer to the actual condition and more accurate.
Exemplary method
Referring to fig. 3, a flow chart of a method for measuring engine valve spring force according to an embodiment of the invention is shown. In this embodiment, the method may include, for example, the steps of:
step 301: the method comprises the steps of obtaining a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition by using a preset sampling frequency, wherein the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range.
Step 302: and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation among the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, wherein the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press.
It can be understood that the purpose of this embodiment is to obtain a valve spring force in the valve train in a more practical and accurate engine operating condition, so as to determine whether the stiffness of the valve spring is suitable for the engine, and whether the functional requirements such as dynamic response of valve seating can be met, and the economic efficiency and reliability of the engine can be prevented from being affected by excessive friction loss. The method for obtaining the phase angle signal of the camshaft is not different from the existing method, and the valve spring force obtained needs to be calculated by knowing the corresponding relation between the strain signal and the spring force on the basis of obtaining the strain signal of the valve spring. Therefore, the corresponding relationship between the strain signal and the spring force should be calibrated in advance, specifically, the corresponding relationship between the strain signal and the spring force is calibrated by a standard press.
It should be noted that, when the engine runs at a high speed, the change of the valve spring 103 in the valve train is completely obscured by human eyes, that is, the valve spring 103 changes rapidly when the engine runs at a high speed, and in order to more accurately obtain the strain signal of the valve spring, a large number of strain signals need to be taken within 1s, that is, the strain signal of the valve spring should be obtained at a high sampling frequency. For example, in the present embodiment, the preset sampling frequency is 15kHz, i.e., 15000 strain signals are taken within 1 s.
As can be seen from the above detailed description of the engine valve spring force measuring device, in order to make the strain signal of the valve spring 103 measured by the strain gauge 104 strongest and most accurate, in this embodiment, the angle between the grid wire of the strain gauge and the wire axis of the valve spring is 45 °.
It should be noted that, for step 302, the phase angle signal of the camshaft is obtained by combining the rotation angle signal of the camshaft with the rotation angle signal of the motor, and the valve spring force is obtained by the strain signal of the valve spring and the corresponding relationship between the strain signal and the spring force. Generally, a phase angle signal of the camshaft is obtained first, and then a valve spring force corresponding to the phase angle signal of the camshaft is calculated. Thus, in some implementations of this embodiment, the step 302 may include, for example, the steps of:
step A: obtaining a phase angle signal of the cam shaft according to the rotation angle signal of the motor and the rotation angle signal of the cam shaft;
and B: and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the strain signal of the strain gauge and the corresponding relation between the strain signal and the spring force.
According to various implementation manners provided by the embodiment, a rotation angle signal of a motor, a rotation angle signal of a camshaft and a strain signal of a valve spring under a preset condition are obtained at a preset sampling frequency, the preset condition is a simulated operation boundary condition of an engine valve actuating mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range; and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation among the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, wherein the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press. Therefore, strain signals of the valve spring under the condition of simulating the operation boundary of an engine valve mechanism can be directly acquired by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the acquired valve spring force is closer to the actual condition and more accurate.
Exemplary devices
Referring to fig. 4, a schematic structural diagram of an engine valve spring force measuring device according to an embodiment of the present invention is shown. In this embodiment, the apparatus may specifically include:
the acquisition unit 401 is configured to acquire a rotation angle signal of a motor, a rotation angle signal of a camshaft, and a strain signal of a valve spring under a preset condition at a preset sampling frequency, where the preset condition is a simulated operation boundary condition of an engine valve train, the strain signal of the valve spring is measured by a strain gauge directly attached to an outer side of a spring wire of the valve spring, and an included angle between a gate wire of the strain gauge and an axis of the spring wire of the valve spring is within a preset range;
an obtaining unit 402, configured to obtain a valve spring force corresponding to a phase angle signal of the camshaft according to a corresponding relationship between a rotation angle signal of the motor, a rotation angle signal of the camshaft, and a strain signal and a spring force of the valve spring, where the corresponding relationship between the strain signal and the spring force is calibrated in advance by a standard press.
Optionally, the preset sampling frequency is 15 kHz.
Optionally, an included angle between the grid wire of the strain gauge and the spring wire axis of the valve spring is 45 °.
Optionally, the obtaining unit 402 includes a first obtaining subunit and a second obtaining subunit;
the first obtaining subunit is configured to obtain a phase angle signal of the camshaft according to a rotation angle signal of the motor and a rotation angle signal of the camshaft;
the first obtaining subunit is configured to obtain a valve spring force corresponding to the phase angle signal of the camshaft according to the strain signal of the strain gauge and a corresponding relationship between the strain signal and the spring force.
Through various implementation manners provided by the embodiment, the measuring device for the spring force of the engine valve comprises an acquisition unit and an obtaining unit; the device comprises an acquisition unit, a signal processing unit and a signal processing unit, wherein the acquisition unit is used for acquiring a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition at a preset sampling frequency, the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range; and the obtaining unit is used for obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation between the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, and the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press machine. Therefore, strain signals of the valve spring under the condition of simulating the operation boundary of an engine valve mechanism can be directly acquired by the strain gauge adhered to the outer surface of the spring wire of the valve spring, and the strain condition of the valve spring is directly measured under the dynamic condition, so that the acquired valve spring force is closer to the actual condition and more accurate.
It is 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. 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 foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. An engine valve spring force measuring apparatus, comprising: the device comprises an operating condition simulation device, a corner sensor, a valve spring, a strain gauge, a signal cable and a measuring device, wherein the operating condition simulation device is connected with the valve spring and the corner sensor, the corner sensor is connected with the measuring device, the strain gauge is directly adhered to the outer surface of a spring wire of the valve spring and is connected with the signal cable, and the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measuring device; an included angle between a grid wire of the strain gauge and the axis of a spring wire of the valve spring is within a preset range;
the running condition simulation device is used for simulating the running boundary condition of the engine valve mechanism according to the test program;
the rotation angle sensor is used for measuring a rotation angle signal of the motor and a rotation angle signal of the cam shaft and sending the rotation angle signals to the measuring device;
the valve spring is used for generating strain under the operation boundary condition of the engine valve mechanism;
the strain gauge is used for measuring a strain signal of the valve spring generating strain and transmitting the strain signal to the signal cable;
the signal cable is used for transmitting a strain signal of the valve spring to the measuring device;
the measuring device is used for obtaining valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation between the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, and the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press machine.
2. The apparatus of claim 1, wherein the angle between the wire of the strain gauge and the wire axis of the valve spring is 45 °.
3. The apparatus of claim 1 wherein the operational boundary conditions of the engine valve train include oil pressure, oil temperature, and fuel pressure.
4. The apparatus of claim 1, wherein the strain gage is a high temperature resistant strain gage having a width of less than 2 mm.
5. The apparatus of claim 1, wherein the signal cable is high temperature resistant, oil resistant, and has a cross-sectional area of less than 0.1mm2The signal cable of (2).
6. A method of measuring engine valve spring force, characterized by using the apparatus of any one of claims 1-5, the method comprising:
acquiring a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition by using a preset sampling frequency, wherein the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range;
and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation among the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, wherein the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press.
7. The method of claim 6, wherein the preset sampling frequency is 15 kHz.
8. The method of claim 6, wherein the angle between the wire of the strain gauge and the wire axis of the valve spring is 45 °.
9. The method of claim 6, wherein obtaining a valve spring force corresponding to a phase angle signal of a camshaft from a correspondence of a rotation angle signal of the motor, a rotation angle signal of the camshaft, a strain signal of the strain gauge, and a strain signal to a spring force comprises:
obtaining a phase angle signal of the cam shaft according to the rotation angle signal of the motor and the rotation angle signal of the cam shaft;
and obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the strain signal of the strain gauge and the corresponding relation between the strain signal and the spring force.
10. An engine valve spring force measuring apparatus using the engine valve spring force measuring device according to any one of claims 1 to 5, the apparatus comprising:
the device comprises an acquisition unit, a signal processing unit and a signal processing unit, wherein the acquisition unit is used for acquiring a rotation angle signal of a motor, a rotation angle signal of a cam shaft and a strain signal of a valve spring under a preset condition at a preset sampling frequency, the preset condition is a simulated operation boundary condition of an engine valve mechanism, the strain signal of the valve spring is measured by a strain gauge directly adhered to the outer side of a spring wire of the valve spring, and an included angle between a grid wire of the strain gauge and the axis of the spring wire of the valve spring is within a preset range;
and the obtaining unit is used for obtaining the valve spring force corresponding to the phase angle signal of the camshaft according to the corresponding relation between the rotation angle signal of the motor, the rotation angle signal of the camshaft, the strain signal of the valve spring and the strain signal and the spring force, and the corresponding relation between the strain signal and the spring force is calibrated in advance by a standard press machine.
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| CN114486034B (en) * | 2022-01-15 | 2023-05-23 | 重庆长安汽车股份有限公司 | Method for measuring valve seating force |
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| CN102620924A (en) * | 2012-04-12 | 2012-08-01 | 杭州电子科技大学 | Device and method for measuring dynamic rigidity of valve spring of valve mechanism |
| CN104180994A (en) * | 2013-05-20 | 2014-12-03 | 广州汽车集团股份有限公司 | Engine valve mechanism motion characteristic test method and system thereof |
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| US4735101A (en) * | 1985-06-06 | 1988-04-05 | Charbonneau & Godfrey Associates | Motor operated valve analysis and testing system with monitoring of spring pack movement through torque switch post |
| DE19848990A1 (en) * | 1998-10-23 | 2000-04-27 | Knorr Bremse Systeme | Brake system for rail vehicles has a local electronic controller for each bogie that controls main brake valve and sprung safety brake with a combined air supply to main brake and safety brake controller |
| CN101571075B (en) * | 2008-07-31 | 2010-12-08 | 侯贺 | General multi-operating mode energy-saving system |
| CN202522406U (en) * | 2012-04-12 | 2012-11-07 | 杭州电子科技大学 | Dynamic rigidity measuring device for valve spring of distribution mechanism |
| CN103759629B (en) * | 2014-01-20 | 2017-06-23 | 杭州电子科技大学 | Engine valve is taken a seat radial deflection measurement apparatus and method |
| CN207033524U (en) * | 2017-08-09 | 2018-02-23 | 北京汽车动力总成有限公司 | A kind of valve spring fixed structure, engine and automobile |
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| CN102620924A (en) * | 2012-04-12 | 2012-08-01 | 杭州电子科技大学 | Device and method for measuring dynamic rigidity of valve spring of valve mechanism |
| CN104180994A (en) * | 2013-05-20 | 2014-12-03 | 广州汽车集团股份有限公司 | Engine valve mechanism motion characteristic test method and system thereof |
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