CN109026255B - Valve lift debugging method and system of continuous variable valve lift mechanism - Google Patents
Valve lift debugging method and system of continuous variable valve lift mechanism Download PDFInfo
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- CN109026255B CN109026255B CN201710432202.7A CN201710432202A CN109026255B CN 109026255 B CN109026255 B CN 109026255B CN 201710432202 A CN201710432202 A CN 201710432202A CN 109026255 B CN109026255 B CN 109026255B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
- F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
Abstract
The invention discloses a valve lift debugging method and a system of a continuously variable valve lift mechanism, wherein the method comprises the steps of driving an eccentric shaft assembly to rotate to a minimum lift position on a lift debugging station; after oil filling of the hydraulic tappet is finished, driving the valve to open and close so as to detect an initial lift curve of the valve; determining an initial valve lift value according to the valve initial lift curve; obtaining the angle of the eccentric wheel according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel and the standard angle; and adjusting the angle of the eccentric wheel sleeved outside the mandrel according to the difference between the angle of the eccentric wheel and the standard angle. According to the method provided by the embodiment of the invention, the processing difficulty and the manufacturing cost can be effectively reduced, the valve lift of each cylinder is easy to adjust, the problem of inconsistent valve lift of each cylinder caused by processing errors of parts and other reasons can be solved, and the limit value of the valve lift of the variable valve lift mechanism can be changed within a certain range.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a valve lift debugging method and system of a continuously variable valve lift mechanism.
Background
The eccentric shaft plays an important role in the variable valve lift mechanism, the arrangement space of the variable valve lift mechanism in the cylinder cover has strict requirements on the eccentric shaft, the eccentric shaft is reliable and compact in structure, the occupied space is small, and the friction resistance is reduced in the motion process. In the related art, the eccentric shaft is divided into an integral type and a press-fitting type: after the integral eccentric shaft is machined and formed at one time, the size of the eccentric wheel cannot be adjusted if the size of the eccentric wheel has deviation, so that the requirement on machining precision is high, and the cost is high; the press-fitting type eccentric shaft has the advantages that after one-time press-fitting forming, the angle is not adjustable any more, and the requirement on press-fitting precision is high. The variable valve lift adjusting mechanism in the related art has poor accumulative error adjustability, poor valve consistency and inaccurate lift control.
Disclosure of Invention
In view of the above, the present invention is directed to a method for debugging a valve lift of a continuously variable valve lift mechanism, which can solve the problem of inconsistent valve lifts of cylinders caused by machining errors of parts, and can change a limit value of the valve lift of the continuously variable valve lift mechanism within a certain range.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a valve lift commissioning method of a continuously variable valve lift mechanism comprising an eccentric shaft assembly (9), said eccentric shaft assembly (9) comprising a spindle (12) and an eccentric (14), said spindle (12) being adapted to be connected to a drive unit, said eccentric (14) being angularly adjustable sleeved outside said spindle (12) and clearance fitted with said spindle (12), said method comprising: driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station; after oil filling of the hydraulic tappet is finished, driving the valve to open and close so as to detect an initial lift curve of the valve; determining an initial valve lift value according to the valve initial lift curve; obtaining the angle of an eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and a standard angle; adjusting the angle of the eccentric wheel (14) sleeved outside the mandrel (12) according to the difference between the angle of the eccentric wheel (14) and the standard angle.
Further, after the angles of the plurality of eccentric wheels (14) are adjusted, the method further comprises the following steps: verifying whether the final valve lift value meets a preset requirement; if so, judging that the continuous variable valve lift mechanism is qualified; and if not, carrying out valve lift debugging on the continuous variable valve lift mechanism again.
Further, the driving valve opening and closing to detect a valve initial lift curve includes: and controlling the camshaft to rotate for a preset time so as to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
Further, the determining an initial valve lift value according to the valve initial lift curve includes: and taking a plurality of wave peak values from the valve initial lift curve, and taking the average value of the wave peak values as the initial valve lift value.
Further, the verifying whether the final valve lift value meets a predetermined requirement includes: controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process; determining a final valve lift value according to the final valve lift curve; and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
Compared with the prior art, the valve lift debugging method of the continuous variable valve lift mechanism has the following advantages:
according to the valve lift debugging method of the continuous variable valve lift mechanism, the valve lift value can be simply and conveniently adjusted to be close to a theoretical value, and the difference of the valve lifts of the four cylinders caused by the size difference and the fit clearance difference of parts of the four cylinders is reduced by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
The invention also aims to provide a valve lift debugging system of the continuous variable valve lift mechanism, which can solve the problem of inconsistent valve lifts of all cylinders caused by machining errors of parts and the like and can change the limit value of the valve lift of the variable valve lift mechanism within a certain range.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a valve lift commissioning system of a continuously variable valve lift mechanism, the continuously variable valve lift mechanism comprising an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprising a spindle (12) and an eccentric (14), the spindle (12) being adapted to be connected to a drive unit, the eccentric (14) being angularly adjustable sleeved outside the spindle (12) and being clearance fitted with the spindle (12), the system comprising: the driving module is used for driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station, and driving the valve to be opened and closed after oil filling of the hydraulic tappet is completed so as to detect an initial lift curve of the valve; the calculation module is used for determining an initial valve lift value according to the valve initial lift curve, obtaining the angle of the eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and a standard angle; the adjusting module is used for adjusting the angle of the eccentric wheel (14) sleeved outside the mandrel (12) according to the difference value between the angle of the eccentric wheel (14) and a standard angle.
Further, the method also comprises the following steps: and the verification module is used for verifying whether the final valve lift value meets the preset requirement after the angles of the eccentric wheels (14) are adjusted, if so, judging that the continuous variable valve lift mechanism is qualified, and otherwise, debugging the valve lift of the continuous variable valve lift mechanism again.
Further, the driving module is configured to: and controlling the camshaft to rotate for a preset time so as to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
Further, the calculation module is configured to: and taking a plurality of wave peak values from the valve initial lift curve, and taking the average value of the wave peak values as the initial valve lift value.
Further, the verification module is configured to: controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process; determining a final valve lift value according to the final valve lift curve; and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
Compared with the prior art, the valve lift debugging system of the continuous variable valve lift mechanism and the valve lift debugging method of the continuous variable valve lift mechanism have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an eccentric shaft assembly according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an eccentric shaft assembly at a fastener according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an eccentric wheel according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a variable valve lift mechanism according to an embodiment of the present invention;
FIG. 5 is a flowchart of a valve lift debugging method of a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 6 is a detailed flowchart of a valve lift debugging method of the continuously variable valve lift mechanism according to the embodiment of the present invention;
fig. 7 is a block diagram showing a valve lift adjustment system of the continuously variable valve lift mechanism according to the embodiment of the present invention.
Description of reference numerals:
the variable valve lift mechanism 100 is provided with,
the device comprises a camshaft 1, a middle swing arm 2, an adjusting pin 3, a roller rocker arm 4, a valve 5, a connecting arm fixing pin 6, a connecting arm 7, an adjusting arm 8, an eccentric shaft assembly 9, a control motor 10, a minimum lift limiting pin 11a, a maximum lift limiting pin 11b, a mandrel 12, a worm wheel 13, an eccentric wheel 14, an eccentric circle section 14a, a fastening section 14b, an arc-shaped surface 14c, an adjusting hole 14d, a gasket 15, a fastening piece 16, a bearing assembly 17, a check ring 18, a lift sensor transmission pin 19, a reset mechanism 20, a valve lift debugging system 700 of a continuously variable valve lift mechanism, a driving module 710, a calculating module 720 and an adjusting module 730.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 4, the variable valve lift mechanism 100 may include a camshaft 1, an intermediate swing arm 2, an adjustment pin 3, a roller rocker arm 4, a valve 5, a connecting arm fixing pin 6, a connecting arm 7, an adjustment arm 8, an eccentric shaft assembly 9, a control motor 10, and a return mechanism 20. The variable valve lift mechanism 100 may be a continuously variable valve lift mechanism.
The camshaft 1 is connected with a crankshaft of an engine, for example, the camshaft can be connected through chain transmission, the camshaft 1 rotates and drives the middle swing arm 2 to swing by taking the adjusting pin 3 as a rotating center, the middle swing arm 2 drives the roller swing arm 4 to control the opening and closing of the valve 5, and the reset mechanism 20 is used for driving the middle swing arm 2 to reset.
The control motor 10 may be coupled to the eccentric shaft assembly 9 for controlling the eccentric shaft assembly 9 to rotate clockwise or counterclockwise, for example, the output shaft of the control motor 10 may be configured as a worm, the eccentric shaft assembly 9 may include a worm wheel 13, and the worm 13 is engaged with the worm wheel for coupling the control motor 10 to the eccentric shaft assembly 9.
The eccentric shaft assembly 9 is provided with an eccentric wheel 14, two ends of the adjusting arm 8 are respectively in shaft hole clearance fit with the eccentric wheel 14 and the adjusting pin 3, two ends of the connecting arm 7 are respectively connected with the adjusting pin 3 and the connecting arm fixing pin 6, the connecting arm fixing pin 6 can be fixedly arranged on the cylinder cover, and the connecting arm 7 is used for limiting the movement track of the adjusting pin 3.
When the eccentric wheel 14 rotates, the adjusting arm 8 drives the adjusting pin 3 to swing by taking the connecting arm fixing pin 6 as a rotating center, and the adjusting pin 3 is the rotating center of the middle swing arm 2, so that the position of the rotating center of the middle swing arm 2 can be adjusted by rotating the eccentric wheel 14, and the valve lift can be continuously changed.
The eccentric shaft assembly 9 according to an embodiment of the present invention is described below.
As shown in fig. 1 to 4, the eccentric shaft assembly 9 is used for the variable valve lift mechanism 100, and the eccentric shaft assembly 9 includes: mandrel 12, eccentric 14, fastener 16.
The spindle 12 is adapted to be connected to a driving unit, the driving unit can drive the spindle 12 to rotate clockwise or counterclockwise, and the driving unit can be the control motor 10.
The eccentric wheel 14 is sleeved outside the mandrel 12 in an angle-adjustable manner, the eccentric wheel 14 is in clearance fit with the mandrel 12, the fastening piece 16 is detachably connected with the eccentric wheel 14 and the mandrel 12, the fastening piece 16 is used for fixedly connecting the eccentric wheel 14 with the mandrel 12, so that when the mandrel 12 is driven by the driving unit, the eccentric wheel 14 can follow up, and the eccentric wheel 14 can be connected with the adjusting arm 8 to drive the adjusting pin 3 to swing, so that the valve lift corresponding to the eccentric wheel 14 at present is changed.
It will be appreciated that loosening the fastener 16 allows the eccentric 14 to rotate on the mandrel 12 through a range of angles, rotating the eccentric 14 to a target position and then tightening the fastener 16 to achieve a secure connection of the eccentric 14 to the mandrel 12.
The valve lifts of all cylinders can be basically adjusted to be consistent by adjusting the eccentric wheels 14 corresponding to the valves 5 of all cylinders, the problem of inconsistent valve lifts of all cylinders of the engine caused by casting, machining, assembly errors and other reasons of parts is solved, and further the adverse effects of inconsistent cylinder lifts on development of system control programs and control of engine air intake and combustion are reduced. Further, the limit value of the valve lift of the variable valve lift mechanism 100 can be changed within a certain range by the rotation of the eccentric 14 relative to the spindle 12.
According to the eccentric shaft assembly 9 provided by the embodiment of the invention, the processing difficulty and the manufacturing cost can be effectively reduced, the valve lift of each cylinder is easy to adjust, the problem of inconsistent valve lift of each cylinder caused by processing errors of parts and the like can be solved, and the limit value of the valve lift of the variable valve lift mechanism 100 can be changed within a certain range.
According to the variable valve lift mechanism 100 of the embodiment of the invention, the valve lift is easily adjusted.
In some preferred embodiments of the present invention, as shown in fig. 1 and 4, the eccentric shaft assembly 9 further comprises: the turbine is in interference press-fitting with the mandrel 12 and is suitable for being connected with a driving unit, the driving unit can be a control motor 10, the worm wheel 13 can be provided with a minimum lift limiting pin 11a and a maximum lift limiting pin 11b in the circumferential direction, the minimum lift limiting pin 11a and the maximum lift limiting pin 11b and a limiting structure on a cylinder cover can form an eccentric shaft angle limiting mechanism, and the minimum lift and the maximum lift of the variable valve lift mechanism 100 are restrained. Two axial end surfaces of the worm wheel 13 are pushing surfaces, and form an eccentric shaft axial limit with a cylinder cover worm wheel 13 mounting groove.
The eccentric shaft assembly 9 may further include: the lift sensor driving pin 19 is arranged in an end hole of the shaft core in an interference press-fitting mode, a flat opening end of the lift sensor driving pin 19 is used for installing a lift sensor inductance element, and the lift sensor inductance element is used for feeding back an eccentric shaft rotating angle to the control unit.
In some preferred embodiments of the present invention, as shown in fig. 3, the eccentric 14 may have: the eccentric circle section 14a and the fastening section 14b are connected in the axial direction, and the eccentric circle section 14a and the fastening section 14b may be integrally formed.
The eccentric circle section 14a is suitable for being connected with the adjusting arm 8 of the valve 5, the fastening section 14b is provided with an adjusting hole 14d, the fastening piece 16 penetrates through the adjusting hole 14d, the fastening piece 16 is fixedly connected with the mandrel 12, the fastening piece 16 can be a screw, the mandrel 12 can be provided with a threaded hole extending in the radial direction, and the fastening piece 16 penetrates through the adjusting hole 14d and is in threaded connection with the threaded hole so as to press the eccentric wheel 14 and the mandrel 12 tightly.
As shown in fig. 2 and 3, the adjustment hole 14d may be elongated, and the adjustment hole 14d extends in the circumferential direction. The adjustment hole 14d is used to adjust the intake side valve lift of each cylinder. The use of the elongated adjustment hole 14d allows the angle of the eccentric 14 to be continuously adjustable.
As shown in fig. 2 and 3, the fastening section 14b may have a polygonal cross-section, such as a hexagonal cross-section, which facilitates the clamping of the fastening section 14b and the rotation of the fastening section 14 b.
As shown in fig. 1-3, the eccentric shaft assembly 9 may further include: the gasket 15, the gasket 15 can press from both sides and establish between fastener 16 and fastening section 14b, and the gasket 15 all forms face contact with fastener 16 and fastening section 14b, the surface that the head of gasket 15 and screw correspond can be the plane, fastening section 14b can have arcwall face 14c, the regulation hole 14d runs through arcwall face 14c, the surface that the gasket 15 is relative with arcwall face 14c is the arc, like this, the gasket 15 can assist fastener 16 to lock dabber 12 and eccentric wheel 14, and the cooperation of the arcwall face 14c of the arc clamping surface of gasket 15 and eccentric wheel 14 is favorable to eccentric wheel 14 and dabber 12 all can be screwed up fixedly under each angle.
Preferably, as shown in fig. 1-2, each fastening segment 14b may have a plurality of arcuate surfaces 14c, the plurality of arcuate surfaces 14c being axially spaced apart, each eccentric 14 having a plurality of eccentric segments 14a, the plurality of eccentric segments 14a being axially spaced apart. For example, each eccentric 14 has two eccentric circular segments 14a, a fastening segment 14b is provided between the two eccentric circular segments 14a, and arc-shaped surfaces 14c may be provided on the fastening segment 14b near both ends of the two eccentric circular segments 14a, so that the eccentric 14 and the mandrel 12 are connected more firmly and the distribution of the forces is more balanced.
As shown in fig. 1, the eccentric 14 may be plural, and the plural eccentrics 14 are spaced apart in the axial direction. For example, the eccentric wheel 14 may be four, corresponding to four cylinders of a four-cylinder engine.
The eccentric shaft assembly 9 further comprises: a plurality of bearing assemblies 17, the plurality of bearing assemblies 17 and the plurality of eccentric wheels 14 are arranged in an axially staggered manner, the bearing assembly 17 between two adjacent eccentric wheels 14 is positioned by the corresponding two eccentric wheels 14, and the bearing assembly 17 at the end is positioned by the adjacent eccentric wheels 14 and the retainer ring 18. The above-described spacing manner makes full use of the eccentric 14, which can reduce the number of parts. The bearing assembly may comprise a needle bearing.
As shown in fig. 1, the end of the turbine remote from the eccentric 14 may also be provided with a bearing assembly 17, and the bearing assembly 17 may be positioned by two collars 18.
FIG. 5 is a flow chart of a valve lift commissioning method of a continuously variable valve lift mechanism according to one embodiment of the present invention. As shown in fig. 5 in combination with fig. 6, the valve lift commissioning method of the continuously variable valve lift mechanism according to one embodiment of the present invention includes the following steps:
s501: and driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station.
For example: the cylinder cover assembly provided with the continuous variable valve lift mechanism is placed on valve lift consistency debugging equipment (lift debugging station).
S502: and after oil filling of the hydraulic tappet is finished, the valve is driven to be opened and closed so as to detect the initial lift curve of the valve. For example: and controlling the camshaft to rotate for a preset time to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
In one embodiment of the invention, the predetermined time is 6 seconds. Specifically, the main oil duct supplies oil to complete oil charging of the hydraulic tappet. The eccentric shaft assembly is driven by a control motor of the continuous variable valve lift mechanism to rotate to a minimum lift position, the cam shaft rotates for 6 seconds, and the valve lift sensor records a valve lift curve (namely, a valve initial lift curve) while driving the valve to open and close.
S503: and determining an initial valve lift value according to the valve initial lift curve. In a specific example of the present invention, a plurality of peak values may be taken from the valve initial lift curve, and an average value of the plurality of peak values may be taken as the initial valve lift value.
Taking 10 as an example, the valve lift debugging equipment takes 10 wave peak values of the middle position according to the collected valve initial lift curve, and obtains an average value as an initial valve lift value.
S504: and obtaining the angle of the eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and the standard angle. That is, according to the initial valve lift value, the angle of the eccentric wheel (namely, the angle of the eccentric wheel (14)) is calculated, and then the difference value between the angle of the eccentric wheel (14) and the theoretical angle (namely, the standard angle) is calculated.
S505: the angle of the eccentric wheel (14) sleeved outside the mandrel (12) is adjusted according to the difference value between the angle of the eccentric wheel (14) and the standard angle. The eccentric wheel can be firstly clamped through an eccentric wheel adjusting tool, then the eccentric wheel pressing block bolt is loosened, and then the position of the eccentric wheel is adjusted, wherein the adjustment amount is the difference value between the angle of the eccentric wheel (14) and a standard angle. And after the angle is adjusted, screwing the eccentric wheel pressing block bolt.
Specifically, referring to fig. 1-4, the eccentric 14 is disposed on the mandrel 12 in an angularly adjustable manner, the eccentric 14 is in clearance fit with the mandrel 12, the fastening member 16 is detachably connected to the eccentric 14 and the mandrel 12, the fastening member 16 is used to fixedly connect the eccentric 14 to the mandrel 12, so that when the mandrel 12 is driven by the driving unit, the eccentric 14 can follow up, and the eccentric 14 can be connected to the adjusting arm 8 to drive the adjusting pin 3 to swing, thereby changing the valve lift corresponding to the eccentric 14.
According to the valve lift debugging method of the continuous variable valve lift mechanism, the valve lift value can be simply and conveniently adjusted to be close to a theoretical value, and the difference of the valve lifts of the four cylinders caused by the size difference of parts of the four cylinders and the fit clearance difference is reduced by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
As shown in fig. 6, after the angles of the plurality of eccentrics (14) are all adjusted, the method further comprises the following steps: verifying whether the final valve lift value meets a preset requirement; if so, judging that the continuous variable valve lift mechanism is qualified; and if not, carrying out valve lift debugging on the continuous variable valve lift mechanism again.
Specifically, verifying whether the final valve lift value meets a predetermined requirement includes: controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process; determining a final valve lift value according to the final valve lift curve; and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
Taking the continuous variable valve lift mechanism with 4 eccentric wheels as an example, after the 4 eccentric wheels are debugged, the camshaft is controlled to rotate for 6 seconds again, the valve lift sensor measures the valve lift values of all the valves, the valve lift values are compared with theoretical values, whether the continuous variable valve lift mechanism is qualified or not is judged simply and conveniently according to the comparison result, in this way, qualified products can be cleaned and assembled in the next step, and the unqualified products are debugged once again after the roller rocker arm is replaced.
According to the valve lift debugging method of the continuous variable valve lift mechanism, the valve lift value can be simply and conveniently adjusted to be close to a theoretical value, and the difference of the valve lifts of the four cylinders caused by the size difference and the fit clearance difference of parts of the four cylinders is reduced by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
As shown in fig. 7, a valve lift adjustment system 700 of a continuously variable valve lift mechanism according to an embodiment of the present invention includes: a driving module 710, a calculating module 720 and an adjusting module 730.
The driving module 710 is used for driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station, and driving the valve to open and close after oil filling of the hydraulic tappet is completed so as to detect an initial lift curve of the valve. The calculating module 720 is used for determining an initial valve lift value according to the valve initial lift curve, obtaining an angle of the eccentric wheel (14) according to the initial valve lift value, and calculating a difference value between the angle of the eccentric wheel (14) and a standard angle. The adjusting module 730 is used for adjusting the angle of the eccentric wheel (14) sleeved outside the mandrel (12) according to the difference value between the angle of the eccentric wheel (14) and a standard angle.
In one embodiment of the present invention, further comprising: and the verification module (not shown in the figure 7) is used for verifying whether the final valve lift value meets the preset requirement after the angles of the eccentric wheels (14) are adjusted, if so, the continuous variable valve lift mechanism is judged to be qualified, and otherwise, the valve lift debugging is carried out on the continuous variable valve lift mechanism again. Specifically, the verification module is used for controlling the camshaft to rotate for a preset time again so as to drive the valve to be opened and closed, and in the process, detecting a final lift curve of the valve; determining a final valve lift value according to the final valve lift curve; and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
In one embodiment of the present invention, the actuation module 710 is configured to control the camshaft to rotate for a predetermined amount of time to actuate the valve opening and closing and, during this process, to detect the valve initial lift profile.
In an embodiment of the invention, the calculation module 720 is configured to take a plurality of peak values from the valve initial lift curve, and use an average value of the plurality of peak values as the initial valve lift value.
The valve lift debugging system of the continuous variable valve lift mechanism provided by the embodiment of the invention can simply and conveniently adjust the valve lift value to be close to a theoretical value, and reduce the difference of the valve lifts of the four cylinders caused by the size difference and the fit clearance difference of the parts of the four cylinders by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
It should be noted that, a specific implementation manner of the valve lift debugging system of the continuous variable valve lift mechanism in the embodiment of the present invention is similar to that of the valve lift debugging method of the continuous variable valve lift mechanism in the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not repeated here in order to reduce redundancy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A valve lift tuning method of a continuously variable valve lift mechanism, characterized in that the continuously variable valve lift mechanism comprises an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprises a spindle (12) and an eccentric wheel (14), the spindle (12) is adapted to be connected to a driving unit, the eccentric wheel (14) is angularly adjustably sleeved outside the spindle (12) and the eccentric wheel (14) is synchronously rotatable with the spindle (12) and is clearance-fitted with the spindle (12), the method comprises:
driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station;
after oil filling of the hydraulic tappet is finished, driving the valve to open and close so as to detect an initial lift curve of the valve;
determining an initial valve lift value according to the valve initial lift curve;
obtaining the angle of an eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and a standard angle;
adjusting the angle of the eccentric wheel (14) sleeved outside the mandrel (12) according to the difference between the angle of the eccentric wheel (14) and the standard angle.
2. The valve lift debugging method of a continuously variable valve lift mechanism according to claim 1, further comprising, after the angle adjustment of each of the plurality of eccentric wheels (14) is completed:
verifying whether the final valve lift value meets a preset requirement;
if so, judging that the continuous variable valve lift mechanism is qualified;
and if not, carrying out valve lift debugging on the continuous variable valve lift mechanism again.
3. The valve lift commissioning method of a continuously variable valve lift mechanism of claim 1, wherein said actuating valve opens and closes to detect a valve initial lift profile, comprising:
and controlling the camshaft to rotate for a preset time so as to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
4. The method for debugging the valve lift of the continuous variable valve lift mechanism according to claim 1, wherein the determining an initial valve lift value according to a valve initial lift curve comprises:
and taking a plurality of wave peak values from the valve initial lift curve, and taking the average value of the wave peak values as the initial valve lift value.
5. The valve lift commissioning method of a continuously variable valve lift mechanism according to claim 2, wherein said verifying whether a final valve lift value meets a predetermined requirement comprises:
controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process;
determining a final valve lift value according to the final valve lift curve;
and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
6. A valve lift adjustment system of a continuously variable valve lift mechanism, characterized in that the continuously variable valve lift mechanism comprises an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprises a spindle (12) and an eccentric wheel (14), the spindle (12) is adapted to be connected with a driving unit, the eccentric wheel (14) is angularly adjustably sleeved outside the spindle (12) and the eccentric wheel (14) is synchronously rotatable with the spindle (12) and is clearance-fitted with the spindle (12), the system comprises:
the driving module is used for driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station, and driving the valve to be opened and closed after oil filling of the hydraulic tappet is completed so as to detect an initial lift curve of the valve;
the calculation module is used for determining an initial valve lift value according to the valve initial lift curve, obtaining the angle of the eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and a standard angle;
the adjusting module is used for adjusting the angle of the eccentric wheel (14) sleeved outside the mandrel (12) according to the difference value between the angle of the eccentric wheel (14) and a standard angle.
7. The valve lift commissioning system of a continuously variable valve lift mechanism of claim 6, further comprising: and the verification module is used for verifying whether the final valve lift value meets the preset requirement after the angles of the eccentric wheels (14) are adjusted, if so, judging that the continuous variable valve lift mechanism is qualified, and otherwise, debugging the valve lift of the continuous variable valve lift mechanism again.
8. The system of claim 6, wherein the drive module is configured to:
and controlling the camshaft to rotate for a preset time so as to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
9. The system of claim 6, wherein the calculation module is configured to:
and taking a plurality of wave peak values from the valve initial lift curve, and taking the average value of the wave peak values as the initial valve lift value.
10. The system of claim 7, wherein the verification module is configured to:
controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process;
determining a final valve lift value according to the final valve lift curve;
and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
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| CN114061959A (en) * | 2021-10-14 | 2022-02-18 | 神龙汽车有限公司 | Variable valve lift detection method |
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| CN1802490A (en) * | 2003-03-29 | 2006-07-12 | 液压环有限公司 | Variable valve lift control system for a combustion engine with underneath camshaft |
| CN101539041A (en) * | 2009-04-29 | 2009-09-23 | 奇瑞汽车股份有限公司 | Novel stepless variable valve lift mechanism |
| CN106401687A (en) * | 2015-07-27 | 2017-02-15 | 长城汽车股份有限公司 | Valve lift control system and control method thereof |
| CN106555681A (en) * | 2015-09-28 | 2017-04-05 | 长城汽车股份有限公司 | The control method of continuous variable valve lift system, system and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4220911B2 (en) * | 2004-01-30 | 2009-02-04 | 株式会社オティックス | Variable valve mechanism |
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| CN1802490A (en) * | 2003-03-29 | 2006-07-12 | 液压环有限公司 | Variable valve lift control system for a combustion engine with underneath camshaft |
| CN101539041A (en) * | 2009-04-29 | 2009-09-23 | 奇瑞汽车股份有限公司 | Novel stepless variable valve lift mechanism |
| CN106401687A (en) * | 2015-07-27 | 2017-02-15 | 长城汽车股份有限公司 | Valve lift control system and control method thereof |
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