CN113916118A - CVVL valve lift measuring device and measuring method thereof - Google Patents
CVVL valve lift measuring device and measuring method thereof Download PDFInfo
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- CN113916118A CN113916118A CN202111266496.3A CN202111266496A CN113916118A CN 113916118 A CN113916118 A CN 113916118A CN 202111266496 A CN202111266496 A CN 202111266496A CN 113916118 A CN113916118 A CN 113916118A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims abstract description 132
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000013459 approach Methods 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 7
- 238000011897 real-time detection Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 239000004945 silicone rubber Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 231100000817 safety factor Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 230000037431 insertion Effects 0.000 description 1
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques 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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/003—Measuring of motor parts
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention relates to the technical field of vehicles, and particularly discloses a CVVL (continuously variable valve lift) valve lift measuring device and a measuring method thereof, wherein the valve lift measuring device comprises a dynamometer, an engine, a measuring assembly and a calibration assembly, the engine comprises a cylinder body, a cylinder cover, a valve, a crankshaft, a camshaft, a chain for connecting the crankshaft and the camshaft, and a rocker arm mechanism, the camshaft can drive the rocker arm mechanism to swing so as to open the valve, the measuring assembly comprises a bracket fixedly arranged in a cylinder cavity and an eddy current displacement sensor screwed on the bracket, the eddy current displacement sensor is used for detecting the displacement of the valve in the lift process, the calibration assembly is used for calibrating the relation between the detection voltage of the eddy current displacement sensor and the displacement of the valve, after the calibration is completed, the calibration assembly can be disassembled, the engine crankshaft is reversely dragged by the dynamometer so as to detect the actual displacement of the valve in the cylinder cavity through the eddy current displacement sensor, the valve lift is guaranteed to be real and effective, and the method is simple.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a CVVL valve lift measuring device and a CVVL valve lift measuring method.
Background
In a traditional engine valve driving system, a mechanical cam mechanism is adopted to control an intake valve and an exhaust valve, and because the lift and the distribution timing of the valve are fixed and unchangeable, the adjustment cannot be carried out in the operation of an engine, and the performance of the engine can only be ensured to be optimized under a certain working condition. With the high-speed development of car gasoline engines, the defects that the valve timing and the lift are fixed and unchangeable are more and more prominent.
In view of the above, a continuously variable valve lift actuating mechanism (CVVL) is proposed in the prior art, which can provide appropriate valve opening and closing times or lifts under the rotation speed and load within the whole working range of an engine, thereby improving the intake and exhaust performance of the engine, better meeting the requirements of the engine on power, economy and exhaust emission under high and low rotation speeds, large and small loads, and being more prominent in oil saving particularly under the condition that the fuel consumption regulation is increasingly strict.
In order to measure the valve lift of CVVL, the prior patent with application number CN201711195739.2 in the prior art proposes a measurement system for continuously variable valve lift and valve timing. The method adopts a mode of directly driving the camshaft through driving parts such as a motor and the like to measure the valve lift, and in actual operation, the cylinder cover is reversely dragged, the method can only measure the engine oil temperature of 60 ℃ due to safety factors, meanwhile, the method only drives a single camshaft to rotate and is different from the operation of an actual engine, and the calibration method has poor linearity, so that the measured valve lift has larger error.
Disclosure of Invention
The invention aims to: the CVVL valve lift measuring device and the measuring method thereof are provided to solve the problem that the measured valve lift error is large due to poor linearity of a calibration method for measuring the CVVL valve lift in the related technology.
In one aspect, the present invention provides a valve lift measuring apparatus, including:
a dynamometer;
the engine comprises a cylinder body, a cylinder cover arranged on the cylinder body, an air valve arranged on the cylinder cover in a sliding manner, a crankshaft rotatably arranged on the cylinder body and in transmission connection with the dynamometer, a camshaft arranged at an interval with the crankshaft, a chain connecting the crankshaft and the camshaft, and a rocker mechanism rotatably arranged on the cylinder cover, wherein the camshaft can drive the rocker mechanism to swing so as to open the air valve;
the measuring assembly is arranged in a cylinder cavity of the engine and comprises a support fixedly arranged in the cylinder cavity and an eddy current displacement sensor screwed with the support, the eddy current displacement sensor and the valve are arranged at intervals and used for detecting the displacement of the valve, the eddy current displacement sensor is provided with a detection central line, and the detection central line is perpendicular to the bottom surface of the valve;
the calibration component is detachably connected with the support and the eddy current displacement sensor, and is configured to drive the eddy current displacement sensor to move close to or away from the support when the eddy current displacement sensor is calibrated, and the displacement close to or away from the support can be measured.
As a preferable technical solution of the valve lift measuring device, the calibration assembly includes:
the sleeve is detachably sleeved with the eddy current displacement sensor and can drive the eddy current displacement sensor to rotate relative to the support;
the transmission rod is connected with the sleeve and is used for driving the sleeve to rotate;
the encoder comprises a shell and a core body which is rotatably arranged on the shell, the encoder is used for detecting the rotating angle of the eddy current displacement sensor, the encoder and the bracket are arranged at intervals, and the transmission rod can be fixedly arranged on the encoder in a penetrating mode;
a fixing lever connected with the housing, and the fixing lever is detachably connected with the bracket.
As a preferable technical scheme of the valve lift measuring device, the valve lift measuring device further comprises a data acquisition system and an amplifier which are arranged outside the engine, the data acquisition system is respectively connected with the amplifier and the encoder through data lines, and the amplifier is connected with the eddy current displacement sensor through data lines.
As the preferable technical scheme of the valve lift measuring device, the amplifier is connected with the data line of the eddy current displacement sensor, and the data acquisition system and the data line of the encoder are connected with the cylinder body in a penetrating mode and are connected with the cylinder body in a sealing mode through silica gel.
As a preferable technical scheme of the valve lift measuring device, the calibration assembly further comprises a locking nut, the locking nut is in threaded connection with the transmission rod, and the locking nut is abutted to the core body.
As a preferable technical scheme of the valve lift measuring device, the engine comprises an intake valve and an exhaust valve, the rocker arm mechanisms are arranged corresponding to the intake valve and the exhaust valve, the valve lift measuring device comprises two measuring assemblies, and the two measuring assemblies are respectively arranged corresponding to the intake valve and the exhaust valve.
As a preferable technical scheme of the valve lift measuring device, the measuring assembly further comprises a first nut and a second nut, the first nut and the second nut are both in threaded connection with the eddy current displacement sensor, the first nut and the second nut are respectively located on two sides of the support, and the first nut and the second nut are both in abutting connection with the support.
As a preferred technical scheme of the valve lift measuring device, the measuring assembly further comprises a stud and a bottom plate, the bottom plate is located in the cylinder cavity, the stud penetrates through the cylinder cover, one end of the stud is located outside the cylinder cavity and is in threaded connection with a first fixing nut, the other end of the stud is located in the cylinder cavity and is in threaded connection with a second fixing nut, the stud and the bottom plate are connected through a connecting bolt, and the support is fixedly arranged on the bottom plate.
As a preferable technical scheme of the valve lift measuring device, the distance between the eddy current displacement sensor and the bottom surface of the valve is 0.5 mm-1 mm.
In another aspect, the present invention provides a measuring method of a CVVL valve lift measuring apparatus, which is implemented by the CVVL valve lift measuring apparatus described in any one of the above aspects, the measuring method of the CVVL valve lift measuring apparatus including:
a measuring device assembling the CVVL valve lift measuring device;
the calibration assembly drives the eddy current displacement sensor to gradually approach the valve, and displacement of each position of the eddy current displacement sensor in the process of approaching the valve and detection voltage of the eddy current displacement sensor are collected;
determining a relation of voltage and displacement based on the displacement of the eddy current displacement sensor at each position in the process of approaching the valve and the detection voltage of the eddy current displacement sensor;
disassembling the calibration assembly;
starting the dynamometer, and acquiring real-time detection voltage of the eddy current displacement sensor of the valve in a lift stage in real time;
and determining the real-time displacement of the valve in the lift stage based on the real-time detection voltage and the relation.
The invention has the beneficial effects that:
the invention provides a valve lift measuring device and a measuring method thereof. The engine comprises a cylinder body, a cylinder cover arranged on the cylinder body, an air valve arranged on the cylinder cover in a sliding mode, a crankshaft arranged on the cylinder body in a rotating mode and in transmission connection with a dynamometer, a camshaft arranged at an interval with the crankshaft, a chain connected with the crankshaft and the camshaft, and a rocker mechanism arranged on the cylinder cover in a rotating mode, wherein the camshaft can drive the rocker mechanism to swing to open the air valve. The measuring assembly comprises a support fixedly arranged in a cylinder cavity and an eddy current displacement sensor screwed in the support, the eddy current displacement sensor and the valve are arranged at intervals, the eddy current displacement sensor is used for detecting the displacement of the valve in the lift process, and the eddy current displacement sensor is provided with a detection central line which is perpendicular to the bottom surface of the valve. The calibration assembly is detachably connected with the support and the eddy current displacement sensor, and is configured to drive the eddy current displacement sensor to be close to or far away from the support when the eddy current displacement sensor is calibrated, and the close to or far away displacement can be measured. The measuring assembly of the valve lift measuring device detects the displacement of the valve in the cylinder cavity, and the crankshaft of the engine is reversely dragged, so that the measuring device can detect different rotating speeds and loads of the engine, has a wide detection range, can ensure the accuracy of detection, and ensures the valve lift to be real and effective, and the method is simple.
Drawings
FIG. 1 is a first schematic structural diagram of a valve lift measuring device according to an embodiment of the present invention;
FIG. 2 is a second schematic structural diagram of a valve lift measuring device according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram of a valve lift measuring device in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a connection structure of the data acquisition system, the amplifier, the eddy current displacement sensor and the encoder according to the embodiment of the present invention.
In the figure:
1. a dynamometer;
2. an engine; 21. a cylinder body; 22. a cylinder cover; 23. an intake valve; 24. an exhaust valve; 25. a crankshaft; 26. a flywheel; 27. a camshaft; 28. a chain; 29. a bolerous axis;
3. a measurement assembly; 31. a base plate; 32. a support; 33. an eddy current displacement sensor; 34. a first nut; 35. a second nut; 36. a stud; 37. a connecting bolt; 38. a first fixing nut; 39. a second fixing nut;
4. calibrating the component; 41. a sleeve; 42. a transmission rod; 43. an encoder; 44. fixing the rod; 45. locking the nut; 46. locking the screw;
5. a data acquisition system;
6. an amplifier.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the prior art, through the continuously variable valve lift actuating mechanism, proper valve opening and closing time or lift can be provided under the rotating speed and load in the whole working range of the engine, so that the air intake and exhaust performance of the engine is improved, and the requirements of the engine on power performance, economy and exhaust emission under high rotating speed, low rotating speed, large load and small load are better met.
In order to measure the valve lift of CVVL, the prior patent with application number CN201711195739.2 in the prior art proposes a measurement system for continuously variable valve lift and valve timing. The method adopts a mode of directly driving the camshaft through driving parts such as a motor and the like to measure the valve lift, and in actual operation, the cylinder cover is reversely dragged, the method can only measure the engine oil temperature of 60 ℃ due to safety factors, meanwhile, the method only drives a single camshaft to rotate and is different from the operation of an actual engine, and the calibration method has poor linearity, so that the measured valve lift has larger error.
Therefore, the present embodiment provides a valve lift measuring device, which directly tests a valve lift in a cylinder of an engine 2 by a method of reverse dragging of the engine 2, and calibrates a relational expression between a sensor detection voltage and a valve displacement at the same time, and calculates a displacement of a valve in a lift process based on the relational expression and the detected sensor detection voltage during actual measurement, so that the valve displacement can be ensured to be real and effective, and the method is simple.
As shown in FIGS. 1 to 4, FIG. 1 is a first schematic structural diagram of a valve lift measuring device according to an embodiment of the present invention; FIG. 2 is a second schematic structural diagram of a valve lift measuring device according to an embodiment of the present invention; FIG. 3 is a third schematic structural diagram of a valve lift measuring device in an embodiment of the present invention; fig. 4 is a schematic diagram of a connection structure of the data acquisition system 5, the amplifier 6, the eddy current displacement sensor 33 and the encoder 43 according to an embodiment of the present invention. The valve lift measuring device comprises a dynamometer 1, an engine 2, a measuring assembly 3 and a calibration assembly 4.
The engine 2 in the present embodiment is a part of a complete engine 2 structure, and the engine 2 includes a cylinder block 21, a cylinder head 22 disposed on the cylinder block 21, a valve slidably disposed on the cylinder head 22, a crankshaft 25 rotatably disposed on the cylinder block 21 and drivingly connected to the dynamometer 1, a camshaft 27 disposed at an interval from the crankshaft 25, a chain 28 connecting the crankshaft 25 and the camshaft 27, and a rocker arm mechanism (not shown in the drawing) rotatably disposed on the cylinder head 22, wherein the camshaft 27 can drive the rocker arm mechanism to swing to open the valve. When the dynamometer 1 drives the crankshaft 25 to rotate, the crankshaft 25 drives the camshaft 27 to rotate, and the camshaft 27 drives the rocker arm to swing, so that the rocker arm opens the valve. It will be appreciated that the rocker arm is self-righting by the rocker spring action and the valve closes the air passage by the valve spring action. Therefore, under the action of the rocker arm, the rocker arm spring and the valve spring, the rocker arm can swing in a reciprocating mode, the valve can open or close the air passage in a reciprocating mode, when the valve gradually opens the air passage to the maximum opening degree, the valve is located in the lifting process, and when the valve closes the air passage, the valve is located at the initial seating position. Preferably, the dynamometer 1 is connected to the flywheel 26 of the crankshaft 25 by a flexible shaft 29, so that the requirement for coaxiality of both the output shaft of the dynamometer 1 and the crankshaft 25 can be reduced. It should be noted that the engine 2 is not provided with a piston and a connecting rod, so that the crankshaft 25 does not need to drive the piston to move through the connecting rod, and therefore, the oil passage of the connecting rod journal of the crankshaft 25 does not need to be drilled through.
The measuring component 3 is arranged in a cylinder cavity of the engine 2, and the measuring component 3 can be used for measuring the displacement of the valve when the valve is in a lifting process and is relatively seated. Specifically, the measuring assembly 3 includes a support 32 fixedly arranged in the cylinder cavity, and an eddy current displacement sensor 33 screwed to the support 32, the eddy current displacement sensor 33 is arranged at an interval with the valve, and the eddy current displacement sensor 33 is used for detecting the displacement of the valve in the lift process, the eddy current displacement sensor 33 has a detection center line, and the detection center line is perpendicular to the bottom surface of the valve, so as to ensure the detection precision. Since the eddy current displacement sensor 33 is screw-coupled to the bracket 32, the eddy current displacement sensor 33 can be rotated with respect to the bracket 32 when the eddy current displacement sensor 33 is mounted for position calibration, so as to adjust the distance between the eddy current displacement sensor and the valve.
In this embodiment, the maximum measuring range of the eddy current displacement sensor 33 is 10 mm; the detection accuracy of the eddy current displacement sensor 33 is 1 μm; the distance between the eddy current displacement sensor 33 and the bottom surface of the air valve is 0.5 mm-1 mm.
Optionally, the measuring assembly 3 further includes a first nut 33 and a second nut 35, the first nut 33 and the second nut 35 are both in threaded connection with the eddy current displacement sensor 33, the first nut 33 and the second nut 35 are respectively located on two sides of the bracket 32, and the first nut 33 and the second nut 35 are both abutted to the bracket 32. The position of the eddy current position sensor on the bracket 32 can be ensured to be stable by providing the first nut 33 and the second nut 35.
Optionally, the measuring assembly 3 further includes a stud 36 and a bottom plate 31, the bottom plate 31 is located in the cylinder cavity, the stud 36 penetrates through the cylinder head 22, one end of the stud 36 is located outside the cylinder cavity and is in threaded connection with a first fixing nut 38, the other end of the stud 36 is located in the cylinder cavity and is in threaded connection with a second fixing nut 39, the stud 36 and the bottom plate 31 are connected through a connecting bolt 37, and the support 32 is fixedly disposed on the bottom plate 31. Preferably, the bottom plate 31 is provided with a slot, and the bracket 32 is provided with a plug, the plug and the slot are in plug-in fit to define the relative positions of the bottom plate 31 and the bracket 32. The cross sections of the slots and the insertion columns are preferably square, and the limiting effect is better. It is further preferred that the top of the bottom plate 31 abuts the second retaining nut 39, so that the bottom plate 31 is prevented from rotating relative to the cylinder head 22.
The calibration assembly 4 is detachably connected with the support 32 and the eddy current displacement sensor 33, and the calibration assembly 4 is configured to drive the eddy current displacement sensor 33 to approach or move away from the support 32 when calibrating the eddy current displacement sensor 33, and the approaching or moving away displacement can be measured. In this embodiment, the calibration component 4 is used to calibrate the relationship between the detection current or voltage of the eddy current displacement sensor 33 and the valve displacement, and after the calibration is completed, the calibration component 4 may be removed to detect the actual displacement of the valve through the eddy current displacement sensor 33.
Specifically, calibration assembly 4 includes a bushing 41, a drive rod 42, an encoder 43, and a fixed rod 44. The sleeve 41 is detachably sleeved with the eddy current displacement sensor 33 and can drive the eddy current displacement sensor 33 to rotate relative to the bracket 32; the transmission rod 42 is connected with the sleeve 41 and is used for driving the sleeve 41 to rotate; the encoder 43 comprises a shell and a core body which is rotatably arranged on the shell, the encoder 43 is used for detecting the rotating angle of the eddy current displacement sensor 33, the encoder 43 and the bracket 32 are arranged at intervals, and the transmission rod 42 can be fixedly arranged on the encoder 43 in a penetrating way; the fixing lever 44 is connected to the housing, and the fixing lever 44 is detachably connected to the bracket 32. During calibration, the transmission rod 42 can be rotated to drive the eddy current displacement sensor 33 to rotate spirally relative to the bracket 32, so that the eddy current displacement sensor 33 can be close to or far away from the valve, and in the process, the rotating angle value and the voltage value of the eddy current displacement sensor 33 are collected by the encoder 43 in real time, and the relationship between displacement and voltage can be obtained. In this embodiment, k is an angle, pitch/voltage, where the voltage is a detection voltage of the eddy current displacement sensor 33, the pitch is a pitch of the screw thread connection between the eddy current displacement sensor 33 and the bracket 32, the angle is a value of the rotation angle of the transmission rod 42, and k is a coefficient.
Alternatively, the housing of the encoder 43 is made of plastic, and the housing is provided with a slot, and the fixing rod 44 is in plug-in fit with the slot. In this embodiment, the output signal of the encoder 43 is a TTL signal, the encoder 43 has a function of identifying inversion, the number of pulses of the encoder 4322 is not less than 360, and the encoder 4322 has a function of identifying inversion.
Alternatively, the transmission rod 42 has a smooth rod at one end and is inserted through the core, and a threaded rod at the other end and is threadedly connected to the sleeve 41. The sleeve 41 and eddy current position sensor are also threaded for ease of removal.
Optionally, the calibration assembly 4 further comprises a locking screw 46, the locking screw 46 passing through the fixing rod 44 and being threadedly connected with the bracket 32 to facilitate the detachment of the fixing rod 44.
Optionally, the valve lift measuring device further includes a data acquisition system 5 and an amplifier 6 disposed outside the engine 2, the data acquisition system 5 is connected to the amplifier 6 and the encoder 43 through data lines, and the amplifier 6 and the eddy current displacement sensor 33 are connected through data lines. The voltage or current detected by the eddy current displacement sensor 33 is collected by the amplifier 6 and then sent to the data collection system 5. Preferably, the data line connecting the amplifier 6 and the eddy current displacement sensor 33 and the data line connecting the data acquisition system 5 and the encoder 43 are both inserted into the cylinder 21 and are hermetically connected with the cylinder 21 through silica gel to ensure the air tightness of the connection.
Optionally, bushing 41 is provided with a wire through hole through which the data wire of eddy current displacement sensor 33 passes when calibration assembly 4 is assembled.
According to the valve lift measuring device provided by the embodiment, the measuring assembly 3 detects the displacement of the valve in the cylinder cavity, and the crankshaft 25 of the engine 2 is reversely dragged, so that the detection can be performed on the engine 2 at different rotating speeds and loads, the detection range is wide, the detection accuracy can be ensured, meanwhile, a calibration method is also innovated, and the valve lift is ensured to be real and effective and simple.
Optionally, the calibration assembly 4 further comprises a lock nut 45, the lock nut 45 is screwed to the transmission rod 42, and the lock nut 45 abuts against the core. So as to ensure that the transmission rod 42 can move synchronously with the core body and ensure the accurate angle measurement.
In this embodiment, the engine 2 includes an intake valve 23 and an exhaust valve 24, rocker mechanisms are provided corresponding to the intake valve 23 and the exhaust valve 24, and the valve lift measuring device includes two measuring assemblies 3, and the two measuring assemblies 3 are provided corresponding to the intake valve 23 and the exhaust valve 24, respectively, so that the intake valve 23 and the exhaust valve 24 can be simultaneously detected for displacement during lift by the two measuring assemblies 3.
The assembly process of the measuring method of the lift measuring device is as follows:
1) and screwing a second fixing nut 39 at the bottom end of the stud 36, assembling the stud 36 and the bottom plate 31 through the connecting bolt 37, abutting the bottom plate 31 and the second fixing nut 39, penetrating the stud 36 out of the cylinder head 22, and screwing the top end of the stud 36 and the first fixing nut 38 to fix the bottom plate 31 and the cylinder head 22.
2) And inserting the inserting posts of the bracket 32 into the inserting slots of the bottom plate 31 to fix the bracket 32 and the bottom plate 31.
3) The eddy current displacement sensor 33 is mounted on the bracket 32, and the front and the back of the eddy current displacement sensor 33 are locked by a first nut 33 and a second nut 35.
4) And the sleeve 41 is screwed to the rear end of the eddy current displacement sensor 33 until the sleeve 41 cannot advance.
5) And loosening the first nut 33 and the second nut 35.
6) And the data line of the eddy current displacement sensor 33 passes out from the side surface of the sleeve 41.
7) The drive rod 42 is screwed into the socket 41.
8) And an encoder 43 is installed, the transmission rod 42 penetrates through the core, and the transmission rod 42 and the core are locked through a locking nut 45.
9) The fixing rod 44 is fixed to the bracket 32 at one end thereof with a locking screw 46 and inserted into a groove of the housing of the encoder 43 at the other end thereof.
10) The data line of the encoder 43 is connected to the data acquisition system 5, the data line of the eddy current displacement sensor 33 is connected to the amplifier 6, and the data line of the amplifier 6 is connected to the data acquisition system 5.
11) And rotating the transmission rod 42 by hand, and synchronously acquiring the angle output by the encoder 43 and the voltage output by the eddy current displacement sensor 33 by the data acquisition system 5. And calibrating the relation k between the voltage and the displacement of the eddy current displacement sensor 33, and directly inputting the k into the data acquisition system 5.
12) And disassembling the calibration assembly 4.
13) And adjusting the positions of the eddy current displacement sensor 33 and the intake valve 23 according to the specified requirements, and fixing the eddy current displacement sensor 33 and the intake valve by using a first nut 33 and a second nut 35.
14) And assembling the cylinder head 22 and the cylinder body 21.
15) And the data line which needs to be penetrated out of the cylinder body 21 is sealed by silica gel.
16) And a crankshaft 25, a camshaft 27, a chain 28, and a flywheel 26 are assembled in this order.
17) The engine 2 is mounted on a rack, and the flywheel 26 is connected to the dynamometer 1 through the elastic shaft 29.
18) The dynamometer 1 operates, and the data acquisition system 5 is used for synchronously measuring the displacement of the air valve of the crankshaft 25 at different rotating speeds and different loads.
It should be noted that, since the engine 2 has both the intake valve 23 and the exhaust valve 24, the assembly process of the above valve lift measuring device only defines the assembly process of the measuring component 3 and the calibration component 4 corresponding to one of the valves, and repeats steps 2) -10 before step 8), and the measuring component 3 and the calibration component 4 corresponding to the other valve can be completely assembled.
The present embodiment further provides a measuring method of a CVVL valve lift measuring apparatus, where the measuring method of the CVVL valve lift measuring apparatus is implemented by the CVVL valve lift measuring apparatus, and the measuring method of the CVVL valve lift measuring apparatus includes:
s10: and assembling a measuring device of the CVVL valve lift measuring device.
S20: the electric eddy current displacement sensor 33 is driven to gradually approach the valve through the calibration component 4, and the displacement of each position of the electric eddy current displacement sensor 33 in the process of approaching the valve and the detection voltage of the electric eddy current displacement sensor 33 are acquired.
S31: the relation of the voltage and the displacement is determined based on the displacement of the eddy current displacement sensor 33 at each position during the approach of the valve and the detection voltage of the eddy current displacement sensor 33 and stored in the data acquisition system 5.
S40: the calibration assembly 4 is removed.
S50: and starting the dynamometer 1, and acquiring the real-time detection voltage of the eddy current displacement sensor 33 of the valve in the lift stage in real time.
S60: and determining the real-time displacement of the valve in the lift stage based on the real-time detection voltage and the relation.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A valve lift measuring device, characterized by comprising:
a dynamometer (1);
the engine (2) comprises a cylinder body (21), a cylinder cover (22) arranged on the cylinder body (21), a valve arranged on the cylinder cover (22) in a sliding mode, a crankshaft (25) which is rotatably arranged on the cylinder body (21) and is in transmission connection with the dynamometer (1), a camshaft (27) arranged at an interval with the crankshaft (25), a chain (28) connecting the crankshaft (25) and the camshaft (27), and a rocker mechanism rotatably arranged on the cylinder cover (22), wherein the camshaft (27) can drive the rocker mechanism to swing so as to open the valve;
the measuring assembly (3) is arranged in a cylinder cavity of the engine (2), the measuring assembly (3) comprises a support (32) fixedly arranged in the cylinder cavity and an eddy current displacement sensor (33) screwed on the support (32), the eddy current displacement sensor (33) is arranged at an interval with the valve, the eddy current displacement sensor (33) is used for detecting the displacement of the valve, the eddy current displacement sensor (33) is provided with a detection central line, and the detection central line is perpendicular to the bottom surface of the valve;
a calibration component (4), wherein the calibration component (4) is detachably connected with the support (32) and the eddy current displacement sensor (33), and the calibration component (4) is configured to drive the eddy current displacement sensor (33) to approach or move away relative to the support (32) when calibrating the eddy current displacement sensor (33), and the displacement of the approaching or moving away can be measured.
2. Valve lift measuring device according to claim 1, characterized in that the calibration assembly (4) comprises:
the sleeve (41) is detachably sleeved with the eddy current displacement sensor (33) and can drive the eddy current displacement sensor (33) to rotate relative to the bracket (32);
the transmission rod (42) is connected with the sleeve (41) and is used for driving the sleeve (41) to rotate;
the encoder (43) comprises a shell and a core body which is rotatably arranged on the shell, the encoder (43) is used for detecting the rotating angle of the eddy current displacement sensor (33), the encoder (43) and the bracket (32) are arranged at intervals, and the transmission rod (42) can be fixedly arranged on the encoder (43) in a penetrating manner;
a fixing rod (44) connected to the housing, and the fixing rod (44) is detachably connected to the bracket (32).
3. The valve lift measuring device according to claim 2, characterized in that the valve lift measuring device further comprises a data acquisition system (5) and an amplifier (6) arranged outside the engine (2), the data acquisition system (5) is respectively connected with the amplifier (6) and the encoder (43) through data lines, and the amplifier (6) and the eddy current displacement sensor (33) are connected through data lines.
4. Valve lift measuring device according to claim 3, characterized in that the data lines connecting the amplifier (6) and the eddy current displacement sensor (33) and the data lines connecting the data acquisition system (5) and the encoder (43) are all arranged through the cylinder (21) and are all connected with the cylinder (21) in a sealing manner by means of silicone rubber.
5. Valve lift measuring device according to claim 2, characterized in that the calibration assembly (4) further comprises a lock nut (45), the lock nut (45) being screwed to the transmission rod (42), and the lock nut (45) abutting the core.
6. Valve lift measuring device according to claim 1, characterized in that the engine (2) comprises an inlet valve (23) and an exhaust valve (24), the rocker mechanism being provided in correspondence of both the inlet valve (23) and the exhaust valve (24), the valve lift measuring device comprising two measuring assemblies (3), the two measuring assemblies (3) being provided in correspondence of the inlet valve (23) and the exhaust valve (24), respectively.
7. Valve lift measuring device according to claim 1, characterized in that the measuring assembly (3) further comprises a first nut (33) and a second nut (35), the first nut (33) and the second nut (35) being in threaded connection with the eddy current displacement sensor (33), and the first nut (33) and the second nut (35) being located on either side of the bracket (32), respectively, the first nut (33) and the second nut (35) abutting against the bracket (32).
8. The valve lift measuring device according to claim 1, characterized in that the measuring assembly (3) further comprises a stud (36) and a bottom plate (31), the bottom plate (31) is located in the cylinder cavity, the stud (36) is arranged through the cylinder head (22), one end of the stud (36) is located outside the cylinder cavity and is in threaded connection with a first fixing nut (38), the other end of the stud (36) is located in the cylinder cavity and is in threaded connection with a second fixing nut (39), the stud (36) and the bottom plate (31) are connected through a connecting bolt (37), and the support (32) is fixedly arranged on the bottom plate (31).
9. Valve lift measuring device according to claim 1, characterized in that the distance between the eddy current displacement sensor (33) and the bottom surface of the valve is 0.5-1 mm.
10. A measuring method of a CVVL valve lift measuring apparatus, characterized in that the measuring method of the CVVL valve lift measuring apparatus is implemented by the CVVL valve lift measuring apparatus of any one of claims 1 to 9, the measuring method of the CVVL valve lift measuring apparatus comprising:
a measuring device assembling the CVVL valve lift measuring device;
the calibration component (4) drives the eddy current displacement sensor (33) to gradually approach the valve, and the displacement of each position of the eddy current displacement sensor (33) in the process of approaching the valve and the detection voltage of the eddy current displacement sensor (33) are acquired;
determining a relation of voltage and displacement based on the displacement of the eddy current displacement sensor (33) at each position during the approach of the valve and the detection voltage of the eddy current displacement sensor (33);
removing the calibration assembly (4);
starting the dynamometer (1), and collecting the real-time detection voltage of the eddy current displacement sensor (33) of the valve in a lift stage in real time;
and determining the real-time displacement of the valve in the lift stage based on the real-time detection voltage and the relation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266496.3A CN113916118B (en) | 2021-10-28 | 2021-10-28 | CVVL valve lift measuring device and measuring method thereof |
| PCT/CN2022/127766 WO2023072162A1 (en) | 2021-10-28 | 2022-10-26 | Cvvl valve lift measurement apparatus and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266496.3A CN113916118B (en) | 2021-10-28 | 2021-10-28 | CVVL valve lift measuring device and measuring method thereof |
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| Publication Number | Publication Date |
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| CN113916118A true CN113916118A (en) | 2022-01-11 |
| CN113916118B CN113916118B (en) | 2023-11-17 |
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| CN (1) | CN113916118B (en) |
| WO (1) | WO2023072162A1 (en) |
Cited By (2)
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| CN114877795A (en) * | 2022-06-08 | 2022-08-09 | 中国第一汽车股份有限公司 | Engine crankshaft vibration damper swing amount measuring device |
| WO2023072162A1 (en) * | 2021-10-28 | 2023-05-04 | 中国第一汽车股份有限公司 | Cvvl valve lift measurement apparatus and measurement method |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023072162A1 (en) | 2023-05-04 |
| CN113916118B (en) | 2023-11-17 |
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