CN107063698B - Testing mechanism, platform and testing method for side-mounted variable valve of internal combustion engine - Google Patents
Testing mechanism, platform and testing method for side-mounted variable valve of internal combustion engine Download PDFInfo
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- CN107063698B CN107063698B CN201611253667.8A CN201611253667A CN107063698B CN 107063698 B CN107063698 B CN 107063698B CN 201611253667 A CN201611253667 A CN 201611253667A CN 107063698 B CN107063698 B CN 107063698B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/046—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring revolutions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/048—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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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 discloses a testing mechanism, a platform and a testing method of a side-mounted variable valve of an internal combustion engine, wherein the testing mechanism comprises the following components: a motor for providing driving power; the cam shaft is in transmission connection with the motor; the tappet is used for transmitting the thrust of the cam shaft to the push rod, and a hydraulic piston is arranged in the tappet; one end of the push rod is connected with the tappet, the other end of the push rod is connected with the valve assembly through the linear force transmission mechanism, and the valve is opened and closed by driving the valve assembly to move; the cylinder cover is provided with a through hole for the valve assembly to pass through in a sealing way, and a closed space for accommodating the valve head action stroke is formed in the cylinder cover; the hydraulic oil supply system is used for providing a circulating hydraulic oil way for the hydraulic piston; the data acquisition system is used for measuring and acquiring test parameters of the tested performance through a sensor group; and the control system is used for controlling different rotating speeds of the cam shaft and different strokes of the hydraulic piston to obtain valve lifting strokes with different motion function curves.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to a testing mechanism, a testing platform and a testing method for a side-mounted variable valve of an internal combustion engine.
Background
For a common engine without variable valve timing technology, the opening and closing times of the intake valve and the exhaust valve are fixed, and the valve lift is also fixed and invariable, namely, only one cam profile of the cam shaft. Such constant valve timing and valve lift is difficult to take into account the engine's needs at different speeds and conditions. The fixed intake and exhaust cadences prevent the engine from improving efficiency, and as a result, the engine does not obtain optimal high-speed efficiency nor optimal low-speed torque, and the lift cannot enable the engine to respond well in both high-speed and low-speed regions.
The variable valve timing technique enables the engine to obtain valve lift that meets demand in both the high speed region and the low speed region, thereby improving the high speed power and low speed torque of the engine. The reasonable selection of the valve timing ensures the best charging efficiency hv, and the selection of different valve strokes at different rotating speeds is an extremely important technical problem for improving the engine performance.
The variable valve mechanism of the diesel engine is developed to study the function curve corresponding to the valve motion of the engine at different rotating speeds. Since the development of variable valve trains for diesel engines is an important task, the performance and parameters thereof need to be tested continuously during the development process.
In the current development process of the variable valve mechanism, the variable valve mechanism is directly tested on an engine. The mode increases development difficulty and period, and is easy to damage the engine and increases development cost.
At present, the number of test platforms for the variable valve system is small, and the existing variable valve test platforms have the following defects:
1. some test bench structures are simple relatively, the function is more single, like patent 201010213919.0 provides a variable valve timing system performance test bench of engine, including the cylinder head, the camshaft is installed in the cylinder head, the camshaft front end is connected with the phaser, the rear end of camshaft is connected with photoelectric encoder, valve assembly installs in the cylinder head and rotates and act along with the camshaft, install the engine oil control valve on the cylinder head, driving motor drives the crankshaft sprocket through the drive hold-in range, the crankshaft sprocket passes through the chain and drives the phaser, crankshaft sprocket below is provided with crankshaft position sensor, hydraulic oil gets into and the oil-out of the oil inlet that sets up on the cylinder head. The test items and the test strokes of the valves which can be completed by the test bench are limited, and most of the test bench can be only used for some smaller engines.
2. The test platform of some also can accomplish relevant performance test and reliability test etc. for patent 200910226342.4 discloses a petrol engine variable valve timing performance test device, including test bench, hydraulic pressure part and control portion, hydraulic pressure part and test bench pipe connection, control portion and test bench and hydraulic pressure part line connection, test bench include the frame, be provided with driving motor and transmission shaft in the frame by the setting of test piece in the frame, be equipped with torque sensor between driving motor output shaft and transmission shaft, the transmission shaft is connected with being tested piece transmission, driving motor drives the transmission shaft and rotates in order to realize being tested the rotation of piece. However, the test board has incomplete monitoring data aiming at the variable valve parts, and the test is required to be carried out on an engine, so that the research and development cost is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a testing mechanism, a testing platform and a testing method for a side-mounted variable valve of an internal combustion engine, so as to meet the testing of key parameters and performances of the side-mounted variable valve mechanism to be developed.
According to one aspect of the present invention, there is provided a test mechanism for a side-mounted variable valve of an internal combustion engine, comprising:
a motor for providing driving power;
the cam shaft is in transmission connection with the motor;
the tappet is used for transmitting the thrust of the cam shaft to the push rod, and a hydraulic piston is arranged in the tappet;
one end of the push rod is connected with the tappet, the other end of the push rod is connected with the valve assembly through the linear force transmission mechanism, the valve is opened and closed by driving the valve assembly to move,
the cylinder cover is provided with a through hole for the valve assembly to pass through in a sealing way, and a closed space for accommodating the valve head action stroke is formed in the cylinder cover;
the hydraulic oil supply system is used for providing a circulating hydraulic oil way for the hydraulic piston;
the data acquisition system is used for measuring and acquiring test parameters of the tested performance through a sensor group;
and the control system is used for controlling different rotating speeds of the cam shaft and different strokes of the hydraulic piston to obtain valve lifting strokes with different motion function curves.
The test platform can simulate the test state of the valve mechanism on the engine in the development process of the variable valve mechanism, and simultaneously realize the test of key parameters and performance of the valve mechanism and the test of the reliability of the valve mechanism, thereby avoiding development difficulty and period caused by directly testing the variable valve by the engine and saving test cost.
The hydraulic piston is arranged in the tappet, so that the cam rotation and the double control of the hydraulic system on the valve motion are realized, the stroke of the valve is increased on one hand, the variable condition of different motion function curves of the valve can be tested on the other hand, and the method provides a favorable support for the research and development of the variable valve.
The linear force transmission mechanism comprises a rocker arm assembly, one side arm of the rocker arm assembly is connected with the push rod, and the other side arm of the rocker arm assembly is connected with the valve assembly to be tested. The rotation of the cam shaft and the lifting of the piston rod in the hydraulic piston drive the push rod to move, so that one side arm of the rocker arm assembly is lifted or lowered, and further the linear movement of the valve assembly connected with the other side arm is driven, and the control of the lifting stroke of the valve is realized.
And a roller for transmitting the thrust of the cam shaft is arranged between the cam shaft and the tappet.
The motor is in transmission connection with the cam shaft through a speed reducer, the input end of the speed reducer is connected with the output end of the motor, and the output end of the speed reducer is connected with the input end of the cam shaft. The speed reducer arranged between the motor and the cam shaft can play a role in matching the rotating speed and transmitting the torque.
Two ends of the cam shaft are fixedly connected through flange plates, and the speed reducer is connected with the cam shaft through flat keys.
The hydraulic oil supply system comprises a hydraulic station, a high-pressure oil pipe and an electromagnetic valve, wherein the hydraulic station is connected with a cylinder assembly arranged on the tappet through the high-pressure oil pipe, and the electromagnetic valve is arranged on the high-pressure oil pipe.
The data acquisition system comprises a PC and a high-speed data acquisition card, wherein the PC is connected with the high-speed data acquisition card and is used for displaying and storing various sensor signals in real time; the high-speed data acquisition card is used for simultaneously acquiring various sensor signals and processing the acquired signals into numerical signals which can be received and read by the PC.
The data acquisition system also comprises a photoelectric encoder for measuring the instantaneous rotating speed of the cam, and the photoelectric encoder sends an acquisition trigger signal to the high-speed data acquisition card according to the instantaneous rotating speed signal of the cam.
The sensor group also comprises a push rod strain gauge which is arranged on the push rod and is close to the rocker arm assembly, and the sensor group is mainly used for monitoring deformation of the push rod assembly in the operation process of the variable valve mechanism, particularly deformation of the push rod when the additional lift is generated, so that damage to the push rod assembly and other parts caused by overlarge thrust is avoided.
The sensor group also comprises a rotation angle displacement sensor for measuring the swing angle of the rocker arm assembly, the rotation angle displacement sensor is arranged on the rocker arm assembly and synchronously rotates with the rocker arm assembly, the change of the total lift of the valve during the operation of the hydraulic variable valve mechanism is mainly monitored, the collision of the valve with the piston caused by overlarge additional lift is avoided, and the optimal additional lift of the valve is optimized.
The data acquisition system further comprises a plurality of sensor seats arranged on the high-pressure oil pipe, through holes are formed in the sensor seats, and two ends of each through hole are connected with the high-pressure oil pipe through high-pressure oil pipe joints; the surface of the sensor seat is provided with a mounting hole communicated with the through hole for mounting a sensor for measuring the characteristics of the fluid. The unique design of the sensor seat enables measurement of the related characteristics of the hydraulic oil to be more convenient and test items to be more comprehensive.
The through hole on the sensor seat comprises a through hole oil inlet hole and a through hole oil return hole which are used for being communicated with the inlet and the return hole of the electromagnetic valve.
The sensors that measure the characteristics of the fluid include conventional pressure sensors, transient pressure sensors, and/or temperature sensors.
The conventional pressure sensor is arranged on a sensor seat behind a hydraulic oil outlet of the hydraulic station; the instantaneous pressure sensor is arranged between the electromagnetic valve and the conventional pressure sensor and/or between the electromagnetic valve and a cylinder assembly arranged on the tappet and is used for monitoring and collecting instantaneous pressure values of hydraulic oil in the hydraulic piston cavity and the whole hydraulic oil way.
According to another aspect of the present invention, there is provided a test bench for a side-mounted variable valve of an internal combustion engine, comprising:
the first flat plate is used for directly bearing the motor and is used as a bearing bottom plate of other structures;
the second flat plate is fixed on the first flat plate through the first upright post and is used for bearing a speed reducer and a cam shaft which are in transmission connection with the motor;
the third flat plate is fixed through a second upright post vertically connected with the second flat plate and/or a third upright post vertically connected with the first flat plate, a tappet seat for fixing a tappet is arranged on the third flat plate, and a third through hole aligned with the air cylinder is formed in the third flat plate;
and the fourth flat plates are used for accommodating the air cylinder assemblies, fourth through holes aligned with the third through holes are formed in the fourth flat plates, and the fourth flat plates are stacked on the third flat plates through pin sleeves arranged in the fourth through holes.
The bottom of the first flat plate is provided with a screw jack to integrally adjust the height and flatness of the test platform.
The second flat plate is provided with a first rectangular hole for suspending the cam shaft.
The first support, the second support and the third support are provided with hollow round gaskets for adjusting the height of the platform.
The first, second, third and fourth flat plates are respectively provided with a flat plate hanging lug hole.
According to a third aspect of the present invention, there is provided a method of testing a side-mounted variable valve of an internal combustion engine, comprising the steps of:
the motor drives the cam shaft to rotate through the transmission mechanism, and the tappet and the push rod convert the axial rotation of the cam shaft into linear motion of the valve assembly;
the control system obtains the valve lifting strokes with different motion function curves by simultaneously controlling the rotating speed of the cam shaft and the motion strokes of the hydraulic pistons arranged in the tappet;
by changing the control phase of the hydraulic system, the valve lifting travel rules with different change rules and/or corresponding push rod strain are obtained.
And (3) obtaining the influence law of the control phase of the hydraulic system on the valve lifting stroke by corresponding the control phase of the hydraulic system to the valve lifting stroke, and/or obtaining the influence law of the control phase of the hydraulic system on the push rod strain by corresponding the control phase of the hydraulic system to the push rod strain.
The acquisition system obtains the control phase of the hydraulic system by corresponding the rotation angle position of the cam shaft to the control action of the hydraulic system.
The acquisition system obtains a relation curve of the valve lifting stroke along with the cam angle by corresponding the angle position of the cam shaft to the valve lifting stroke.
The acquisition system obtains a relation curve of the push rod strain along with the cam angle phase by corresponding the angle position of the cam shaft to the push rod strain.
Compared with the prior art, the invention has the following beneficial effects:
1. the electro-hydraulic variable valve mechanism can be used for performance test of the electro-hydraulic variable valve mechanism of the side-mounted valve mechanism and component test of the variable valve mechanism, and has comprehensive functions.
2. The test platform provided by the invention can also be used for testing other similar variable valve mechanisms, and has strong portability.
3. The test platform provided by the invention not only can test performance parameters, but also can monitor other process parameters in real time, thereby ensuring the safety of the rack and the tested object.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a variable valve train test platform;
FIG. 2 is a first schematic plate diagram;
FIG. 3 is a schematic cross-sectional view of a first plate A-A;
FIG. 4 is a schematic cross-sectional view of a first plate B-B;
FIG. 5 is a second plate schematic;
FIG. 6 is a schematic view of a second plate D-D in cross section;
FIG. 7 is a schematic view of a second plate C-C in cross section;
FIG. 8 is a schematic cross-sectional view of a second plate M-M;
FIG. 9 is a third schematic plate diagram;
FIG. 10 is a schematic cross-sectional view of a third plate E-E;
FIG. 11 is a schematic cross-sectional view of a third plate F-F;
FIG. 12 is a fourth schematic plate view;
FIG. 13 is a schematic view of a first leg;
FIG. 14 is a second leg schematic;
FIG. 15 is a third leg schematic;
FIG. 16 is a first flange assembly view;
FIG. 17 is a second flange assembly view;
FIG. 18 is an assembly view of a bearing support;
FIG. 19 is a schematic view of an assembly of a flange, bearing mount and camshaft;
FIG. 20 is a schematic diagram of an oil supply system;
FIG. 21 is a schematic view of a sensor installation;
001. ground, 002, screw jack, 003, first flat plate, 004, first pillar, 005, second flat plate, 006, second pillar, 007, third pillar, 008, third flat plate, 009, fourth flat plate, 010, cylinder head assembly, 011, pin bush, 012, tappet seat, 013, reducer, 014, motor, 015, screw jack seat;
101. the third cylindrical hole 102, the first kidney-shaped hole 103, the first cylindrical hole 104 and the flat plate hanging lug hole;
201. a second cylindrical hole, 202, a second kidney-shaped hole, 203, a first rectangular hole, 204, a first circular through hole, 205, a first counter bore, 206, a third kidney-shaped hole;
301. a second counterbore, 302, a second circular through hole, 303, a second rectangular hole, 304, a third circular through hole, 305, a third counterbore;
401. a fourth circular through hole, 402, a fifth circular through hole;
501. a first strut 502, a second strut 503, a third strut 504, a first internal thread groove 505, a cylindrical boss 506, a second internal thread groove;
601. flange one, 602, flange two, 603, first bolt through holes, 604 and first positioning rabbets;
701. the bearing support is 702, a sixth circular through hole, 703, a second bolt through hole, 704 and a second positioning spigot;
801. deep groove ball bearings;
901. the device comprises an engine oil temperature sensor 902, an engine oil return port 903, an engine oil outlet port 904, a front pressure sensor of an electromagnetic valve 905, a rear total pressure sensor of the electromagnetic valve 906, a three-way pipe 907, a second pipeline 908, a first pipeline 909, an oil inlet and return port 910, an electromagnetic valve 911 and an electromagnetic valve oil return pipe;
a01, photoelectric encoder, A02, angular displacement sensor, A03, push rod strain gauge, A04, rocker arm assembly, A05 and cylinder head.
Detailed Description
For a better understanding of the technical solution of the present invention, the present invention will be further described with reference to the drawings and specific examples.
Examples:
the testing mechanism of the side-mounted variable valve of the internal combustion engine consists of an experimental testing bench, a hydraulic oil supply system and a data acquisition system.
As shown in fig. 1, the experimental bench includes: first plate 003, second plate 005, third plate 008, fourth plate 009, first strut 501004, second strut 502006, third strut 503007, pin sleeve 011, first cam shaft flange 601, second cam shaft flange 602, cam shaft bearing support 701, motor 014, screw jack 002, reducer 013, cam shaft, tappet carrier 012, push rod, cylinder head a05 assembly 010. Screw jack 002 is placed on the ground 001 by screw jack mount 015.
The first flat plate 003, the second flat plate 005, the third flat plate 008 and the fourth flat plate 009 are formed by processing rectangular steel plates, and flat plate hanging lug holes 104 are formed in the periphery of corners of the first flat plate 003, the second flat plate 005 and the third flat plate 008 so as to facilitate the installation of the flat plate hanging lug holes by using a row crane.
As shown in fig. 2-4, the first plate 003 is provided with four first cylindrical holes 103103 and 101101 for carrying the first posts 501004 and three, respectively, and two first waist-shaped holes 102 for fixing anchor screws.
As shown in fig. 5-8, the second plate 005 is provided with four second cylindrical holes 201201 for carrying the second support column 502006, second kidney-shaped holes 202202 for fixing the cam shaft bearing support 701, first rectangular holes 203203 for suspending the cam shaft, four first counter bores 205 for the third support column 503007 to pass through the first circular through holes 204 of the second plate 005 and to be snapped on the top ends of the first support columns 501004 (bolts are fastened on the top ends of the first support columns 501004 through the second plate 005), and four third kidney-shaped holes 206 for fixing the speed reducer 013.
As shown in fig. 9 to 11, the third flat plate 008 is provided with four second counter bores 301 (bolts are fastened to the top end of the second pillar 502006 through the third flat plate 008) which are placed on the top end of the second pillar 502006, four third counter bores 305 (bolts are fastened to the top end three heads through the third flat plate 008) which are placed on the top end of the third pillar 503007, a second circular through hole 302 for six fixing the tappet seats 012, a second rectangular hole 303 for placing the tappet seats 012, and four third circular through holes 304 for fixing the fourth flat plate 009 with bolts.
As shown in fig. 12, the fourth plate 009 is provided with four fourth circular through holes 401, one fifth circular through hole 402.
As shown in fig. 13-15, the first pillar 501004, the second pillar 502006 and the third pillar 503007 are formed by processing cylindrical round steel, the top portions are provided with first internal thread grooves 504, the lower end surfaces are provided with cylindrical bosses 505, and the lower end surfaces of the second pillars 502006 are provided with second internal thread grooves 506. The first plate 003, the second plate 005 and the third plate 008 are connected to each other by a first pillar 501004, a second pillar 502006 and a third pillar 503007, and the fourth plate 009 is stacked on the third plate 008 by a pin sleeve 011.
The first circular bosses of the four first struts 501004 are inserted into the first flat plate 003, the four sides of the first circular bosses are electrically welded and reinforced, the tops of the four first struts 501004 are inserted into the second counter bores 301 of the second flat plate 005, and the second flat plate 005 and the first struts 501004 are reinforced by bolts; the first circular bosses of the four third struts 503007 are inserted into the first plate 003 and the four sides are electrically welded and reinforced, the tops of the four third struts 503007 are inserted into the third counter bores 305 of the third plates 008, and the third plates 008 and the third struts 503007 are reinforced with bolts, wherein the shafts of the two third struts 503007 pass through the first circular through holes 204 of the second plate 005.
As shown in fig. 16, 17 and 18, the outer sides of the first flange 601 and the second flange 602 are respectively provided with a first bolt through hole 603, the shafts are respectively provided with a first positioning spigot 604, and the shaft of the first flange 601 is provided with a flat key groove for connecting with an output shaft of a speed reducer 013. The bearing support 701 is provided with a sixth circular through hole 702 in the middle of the base body, sleeved on the first flange 601 and the second flange 602, provided with a second positioning spigot 704, and provided with four second bolt through holes 703 at the lower end of the bearing.
The motor 014 is mounted on the first plate 003, and its output is connected to the input of the speed reducer 013.
As shown in fig. 19, the second flat plate 005 is fixed with the cam shaft bearing support 701 and the reducer 013 through the second kidney-shaped hole 202 and the third kidney-shaped hole 206 respectively, wherein two sides of the cam shaft are connected through the first flange 601 and the second flange 602 through bolts, the deep groove ball bearings 801 are sleeved on the first flange 601 and the second flange 602, the cam shaft bearing support 701 is sleeved on the deep groove ball bearings 801, namely, the two deep groove ball bearings 801 are fixed between the flange and the bearing support 701 through the first positioning spigot 604 and the second positioning spigot 704, and meanwhile, the flat key shaft of the reducer 013 is inserted into the flat key groove of the first flange 601. The first rectangular hole 203 in the second plate 005 is provided to prevent interference with the second plate 005 during rotation of the cam. The first cylindrical bosses 505 of the four second struts 502006 are inserted into the second plates 005, the lower ends of the second struts 502006 are reinforced with the second plates 005 by bolts, the lower ends of the second struts 502006 are reinforced by electric welding around, the tops of the four second struts 502006 are inserted into the second T-shaped holes of the third plates 008, and the third plates 008 are reinforced with the second struts 502006 by bolts.
Six second circular through holes 302 and one second rectangular hole 303 are formed in the third flat plate 008 for mounting the column base 012, and six fourth flat plates 009 are stacked on the third flat plate 008 through pin sleeves 011, wherein the fourth circular through holes 401 formed in the fourth flat plates 009 are aligned with the third circular through holes 304 formed in the third flat plate 008.
The cylinder head a05 is placed on the six fourth flat plates 009, and the fifth circular through holes 402 formed in the fourth flat plates 009 are formed to avoid interference with the lower end of the cylinder head a05, and the cylinder head a05 is fixed by four customized non-standard head bolts passing through the fourth circular through holes 401 of the fourth flat plates 009 and the third circular through holes 304 of the third flat plates 008 from the upper end of the cylinder head a 05.
The height of the whole experiment platform can be adjusted by processing the hollow round gasket and placing the hollow round gasket on the first support 501004, the second support and the third support so as to eliminate processing and design errors. The experimental equipment (e.g. reducer 013, bearing fabrication, tappet seat 012, cylinder head a 05) can also be slightly height adjusted by means of shims applied. In order to ensure the centering of the output shaft of the dynamometer, the speed reducer 013 and the cam shaft, the first kidney-shaped hole 102, the second kidney-shaped hole 202 and the third kidney-shaped hole 206 are arranged, so that the speed reducer 013 and the cam shaft can move slightly left and right.
Hydraulic oil supply system: the hydraulic pressure station mainly comprises a hydraulic pressure station, a high-pressure oil pipe joint, a sealing gasket, an electromagnetic valve 910 seat, a sensor mounting seat and the like.
And (3) a hydraulic station: the hydraulic oil feeding and returning device comprises a hydraulic oil tank, an oil pump, a hydraulic oil feeding and returning hole and the like, wherein the hydraulic oil feeding and returning hole is respectively connected with a high-pressure oil feeding and returning pipe of an oil supply system.
Solenoid valve 910: the hydraulic valve is positioned between a hydraulic station and a hydraulic variable valve actuating mechanism, and the on-off of hydraulic oil in a high-pressure oil pipe and the hydraulic variable valve actuating mechanism is mainly controlled by an electromagnetic valve 910, so that the opening time and the additional lift value of the additional lift of the valve are controlled.
A sensor base: the external shape of the sensor is cuboid, the inside of the sensor is provided with a circular through hole, both ends of the circular through hole are provided with internal (external) threads matched with a high-pressure oil pipe joint, the high-pressure oil pipe joint is connected with a high-pressure oil pipe and a sensor seat, and a sealing gasket is arranged between the high-pressure oil pipe joint and the sensor seat for sealing; a through threaded hole communicated with the internal round hole is processed on the surface of the sensor seat and is used for installing a required sensor (such as an instantaneous pressure sensor, a temperature sensor and the like).
As shown in fig. 20, the hydraulic station is connected with the high-pressure oil pipe through an oil return port 902 and an oil outlet 903, and the hydraulic oil in the pipeline of the oil inlet and the oil outlet is controlled through a solenoid valve 910910. A front pressure sensor 904 of the solenoid valve 910 is provided between the solenoid valve 910 and the oil outlet 903, and a rear total pressure sensor 905 of the solenoid valve 910 is provided between the solenoid valve 910 and the hydraulic variable valve actuator. After the electromagnetic valve 910, the high-pressure oil pipe is divided into an oil inlet pipe 907 and an oil return pipe 908 by a three-way pipe 906 between the total pressure sensor 905 and the valve actuating mechanism, and the oil inlet pipe 907 and the oil return pipe 908 are communicated with the cylinder assembly by an oil inlet and return port 909. The line between solenoid valve 910 and oil return port 902 is solenoid valve return line 911. An oil temperature sensor 901 is provided in the hydraulic station.
And a data acquisition system: as shown in FIG. 21, the device mainly comprises a PC, a high-speed data acquisition card, a photoelectric encoder A01, a conventional pressure sensor, an instantaneous pressure sensor, a temperature sensor, a push rod strain gauge A03, a corner displacement sensor and the like.
PC, high-speed data acquisition card: the PC is connected with the high-speed data acquisition card and used for displaying and storing various sensor signals in real time; the high-speed data acquisition card is used for simultaneously acquiring various sensor signals and processing the acquired signals into numerical signals which can be received and read by the PC.
Photoelectric encoder a01: the device is connected with the cam and synchronously rotates along with the cam, and is mainly used for measuring the instantaneous rotating speed of the cam and sending an acquisition trigger signal to the high-speed data acquisition card according to the instantaneous rotating speed signal of the cam.
Conventional pressure sensors: the sensor is arranged on a sensor seat behind a hydraulic oil outlet of the hydraulic station, and is mainly used for monitoring whether the oil supply pressure of the hydraulic station is stable or not.
Instantaneous pressure sensor: and the sensor seats are respectively arranged between the electromagnetic valve 910 and a conventional pressure sensor and between the electromagnetic valve 910 and a hydraulic variable valve actuating mechanism and are used for monitoring and collecting instantaneous pressure values of hydraulic oil in a hydraulic piston cavity and the whole hydraulic oil way.
Temperature sensor: the hydraulic oil-way monitoring device is arranged on the hydraulic station and each sensor seat and used for monitoring the oil temperature of each part of the hydraulic oil-way.
Pushrod strain gauge a03: the valve push rod is arranged at a position close to the rocker arm assembly A04, deformation of the push rod assembly in the operation process of the variable valve mechanism is mainly monitored, and particularly deformation of the push rod when an additional lift is generated, so that damage to the push rod assembly and other parts caused by overlarge thrust is avoided.
Angular displacement sensor a02: the hydraulic variable valve mechanism is arranged on a valve rocker assembly A04, rotates synchronously with the valve rocker assembly A04, mainly monitors the change of the total lift of a valve when the hydraulic variable valve mechanism operates, avoids collision of the valve with a piston due to overlarge additional lift, and optimizes the optimal additional lift of the valve.
A testing method of a side-mounted variable valve of an internal combustion engine comprises the following steps:
the motor drives the cam shaft to rotate through the transmission mechanism, and the tappet and the push rod convert the axial rotation of the cam shaft into linear motion of the valve assembly;
the control system obtains the valve lifting strokes with different motion function curves by simultaneously controlling the rotating speed of the cam shaft and the motion strokes of the hydraulic pistons arranged in the tappet.
The acquisition system obtains a relation curve of the valve lifting stroke along with the cam angle by corresponding the angle position of the cam shaft to the valve lifting stroke.
The acquisition system obtains the control phase of the hydraulic system by corresponding the rotation angle position of the cam shaft to the control action of the hydraulic system.
The acquisition system obtains a relation curve of the push rod strain along with the cam angle phase by corresponding the angle position of the cam shaft to the push rod strain.
The control phase of the hydraulic system corresponds to the valve lifting stroke and the push rod strain, so that the influence rule of the control phase of the hydraulic system on the valve lifting stroke and the push rod strain is obtained.
By changing the control phase of the hydraulic system, the valve lifting travel rules with different change rules and corresponding push rod strain are obtained.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (24)
1. A test mechanism for a side-mounted variable valve of an internal combustion engine, comprising:
a motor for providing driving power;
the cam shaft is in transmission connection with the motor;
the tappet is used for transmitting the thrust of the cam shaft to the push rod, and a hydraulic piston is arranged in the tappet;
one end of the push rod is connected with the tappet, the other end of the push rod is connected with the valve assembly through the linear force transmission mechanism, and the valve is opened and closed by driving the valve assembly to move;
the cylinder cover is provided with a through hole for the valve assembly to pass through in a sealing way, and a closed space for accommodating the valve head action stroke is formed in the cylinder cover;
the hydraulic oil supply system is used for providing a circulating hydraulic oil way for the hydraulic piston;
the data acquisition system is used for measuring and acquiring test parameters of the tested performance through a sensor group;
and the control system is used for controlling different rotating speeds of the cam shaft and different strokes of the hydraulic piston to obtain valve lifting strokes with different motion function curves.
2. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 1, wherein: the linear force transmission mechanism comprises a rocker arm assembly, one side arm of the rocker arm assembly is connected with the push rod, and the other side arm of the rocker arm assembly is connected with the valve assembly to be tested.
3. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 2, wherein: and a roller for transmitting the thrust of the cam shaft is arranged between the cam shaft and the tappet.
4. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 1, wherein: the motor is in transmission connection with the cam shaft through a speed reducer, the input end of the speed reducer is connected with the output end of the motor, and the output end of the speed reducer is connected with the input end of the cam shaft.
5. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 4, wherein: the two ends of the cam shaft are fixedly connected through the flange plates, and the speed reducer is connected with the cam shaft through a flat key.
6. A testing mechanism for a side-mounted variable valve of an internal combustion engine according to any one of claims 1 to 5, characterized in that: the hydraulic oil supply system comprises a hydraulic station, a high-pressure oil pipe and an electromagnetic valve, wherein the hydraulic station and the cylinder assembly are connected through the high-pressure oil pipe, and the electromagnetic valve is arranged on the high-pressure oil pipe.
7. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 6, wherein: the data acquisition system comprises a PC and a high-speed data acquisition card, wherein the PC is connected with the high-speed data acquisition card and is used for displaying and storing various sensor signals in real time; the high-speed data acquisition card is used for simultaneously acquiring various sensor signals and processing the acquired signals into numerical signals which can be received and read by the PC.
8. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the data acquisition system further comprises a photoelectric encoder for measuring the instantaneous rotating speed of the cam, and the photoelectric encoder sends an acquisition trigger signal to the high-speed data acquisition card according to the instantaneous rotating speed signal of the cam.
9. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the sensor group also comprises a push rod strain gauge which is arranged on the push rod and is close to the rocker arm assembly.
10. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the sensor group also comprises a rotation angle displacement sensor used for measuring the swing angle of the rocker arm assembly.
11. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the data acquisition system further comprises a plurality of sensor seats arranged on the high-pressure oil pipe, through holes are formed in the sensor seats, and two ends of each through hole are connected with the high-pressure oil pipe through high-pressure oil pipe joints; the surface of the sensor seat is provided with a mounting hole communicated with the through hole for mounting a sensor for measuring the fluid property.
12. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the through holes on the sensor seat comprise through hole oil inlet holes and through hole oil return holes which are used for being communicated with the inlet and the return openings of the electromagnetic valve.
13. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the sensors that measure fluid properties include conventional pressure sensors, transient pressure sensors, and/or temperature sensors.
14. The test mechanism for a side-mounted variable valve of an internal combustion engine according to claim 7, wherein: the conventional pressure sensor is arranged on a sensor seat behind a hydraulic oil outlet of the hydraulic station; the instantaneous pressure sensor is arranged between the electromagnetic valve and the conventional pressure sensor and/or between the electromagnetic valve and the cylinder cover and is used for monitoring and collecting instantaneous pressure values of hydraulic oil in the hydraulic piston cavity and the whole hydraulic oil way.
15. A test platform for a side-mounted variable valve of an internal combustion engine, comprising:
the first flat plate is used for directly bearing the motor and is used as a bearing bottom plate of other structures;
the second flat plate is fixed on the first flat plate through a first upright post and is used for bearing a speed reducer and a cam shaft which are in transmission connection with the motor;
the third flat plate is fixed through a second upright post vertically connected with the second flat plate and/or a third upright post vertically connected with the first flat plate, a tappet seat for enabling the push rod to stably pass through is arranged on the third flat plate, and a third through hole aligned with the air cylinder is formed in the third flat plate;
the plurality of fourth flat plates are used for accommodating the air cylinder assemblies, fourth through holes aligned with the third through holes are formed in each fourth flat plate, and the fourth flat plates are stacked on the third flat plates through pin sleeves arranged in the fourth through holes.
16. The testing platform for a side-mounted variable valve of an internal combustion engine of claim 15, wherein: the bottom of the first flat plate is provided with a screw jack so as to integrally adjust the height and flatness of the test platform.
17. The testing platform for a side-mounted variable valve of an internal combustion engine of claim 15, wherein: the second flat plate is provided with a first rectangular hole for suspending the cam shaft.
18. The testing platform for a side-mounted variable valve of an internal combustion engine of claim 15, wherein: and hollow round gaskets for adjusting the height of the platform are arranged on the first support column, the second support column and the third support column.
19. The testing platform for a side-mounted variable valve of an internal combustion engine of claim 15, wherein: and the first, second, third and fourth flat plates are respectively provided with a flat plate hanging lug hole.
20. The testing method of the side-mounted variable valve of the internal combustion engine is characterized by comprising the following steps of:
the motor drives the cam shaft to rotate through the transmission mechanism, and the tappet and the push rod convert the axial rotation of the cam shaft into linear motion of the valve assembly;
the control system obtains the valve lifting strokes with different motion function curves by simultaneously controlling the rotating speed of the cam shaft and the motion strokes of the hydraulic pistons arranged in the tappet; by changing the control phase of the hydraulic system, the valve lifting travel rules with different change rules and/or corresponding push rod strain are obtained.
21. The method for testing a side-mounted variable valve of an internal combustion engine according to claim 20, wherein: and (3) obtaining the influence law of the control phase of the hydraulic system on the valve lifting stroke by corresponding the control phase of the hydraulic system to the valve lifting stroke, and/or obtaining the influence law of the control phase of the hydraulic system on the push rod strain by corresponding the control phase of the hydraulic system to the push rod strain.
22. The method for testing a side-mounted variable valve of an internal combustion engine according to claim 21, wherein: the acquisition system obtains the control phase of the hydraulic system by corresponding the rotation angle position of the cam shaft to the control action of the hydraulic system.
23. The method for testing a side-mounted variable valve of an internal combustion engine according to claim 21, wherein: the acquisition system is used for obtaining a relation curve of the valve lifting travel along with the cam angle by corresponding the angle position of the cam shaft to the valve lifting travel.
24. The method for testing a side-mounted variable valve of an internal combustion engine according to claim 21, wherein: and the acquisition system is used for obtaining a relation curve of the push rod strain along with the cam angle phase by corresponding the angle position of the cam shaft to the push rod strain.
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| CN107884194A (en) * | 2017-11-07 | 2018-04-06 | 西华大学 | A kind of big valve stroke measurement and knock-on test device and method |
| CN108036699B (en) * | 2017-11-24 | 2020-01-14 | 重庆长安汽车股份有限公司 | Measuring system for continuously variable valve lift and valve timing |
| CN109185274B (en) * | 2018-10-18 | 2020-03-20 | 广东利迅达机器人系统股份有限公司 | Testing method of hydraulic intelligent circulation testing system of speed reducer |
| CN111207927A (en) * | 2018-11-21 | 2020-05-29 | 中国船舶重工集团公司第七一一研究所 | Parameter monitoring device for valve drive mechanism of internal combustion engine and valve drive mechanism |
| CN109611205B (en) * | 2018-11-28 | 2020-12-25 | 天津大学 | Four-stroke engine phase detection method based on valve train rocker arm position detection |
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