CN109014871A - A kind of engine compression ratio regulation method and regulation device - Google Patents
A kind of engine compression ratio regulation method and regulation device Download PDFInfo
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- CN109014871A CN109014871A CN201810841013.XA CN201810841013A CN109014871A CN 109014871 A CN109014871 A CN 109014871A CN 201810841013 A CN201810841013 A CN 201810841013A CN 109014871 A CN109014871 A CN 109014871A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/042—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts specially adapted for combustion engines
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- Combustion & Propulsion (AREA)
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- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of engine compression ratio regulation method and regulation devices, the bulge quantity of each piston in cylinder body by measuring engine respectively, the bulge quantity of piston is compared with preset standard, determine the cylinder pad of corresponding thickness, the cylinder pad is set between the cylinder body of engine and cylinder cap, so as to piston bulge quantity and the grouping of cylinder pad, reduce the combustion chamber volume tolerance of cylinder pad holes, and then reduce compression ratio tolerance, the precision for improving compression ratio, so that engine performance consistency is guaranteed；In addition, engine compression ratio regulation device, using Automated assembly process, error caused by human factor is avoided, accuracy, while the test step of piston overhang are improved, can play the role of real-time process monitoring, avoid piston overhang not in the normal range the case where.
Description
Technical field
The present invention relates to vehicle motor field more particularly to a kind of engine compression ratio regulation method and regulation devices.
Background technique
The compression ratio of engine is a vital parameter, has large effect to engine power and torque.It is real
Border compression ratio will lead to incomplete mixture combustion, torque and power reduction, oil consumption lower than design value and increase, and compression ratio is higher than
Design value is easy to produce pinking, seriously affects the working condition of engine, therefore higher to the required precision of compression ratio.
Primary motivation is in-line four cylinder turbocharged engine, and compression ratio design value is 17.4 ± 1.2, and compression ratio ε is calculated
Formula:
Vc=V1+V2+V3+V4
Wherein, VH- displacement；Vc- cylinder operation minimum volume；V1-- piston combustion bowl volume；V2- cylinder cap
Combustion chamber volume；V3- cylinder pad holes volume；V4- cylinder prepareding gap volume；
Displacement VHIt is the cylindrical body of piston motion range, without variable, and tolerance is small, it is believed that be fixed
Value, calculating compression ratio key is to calculate cylinder operation minimum volume Vc.Cylinder operation minimum volume VcIt mainly include that cylinder pads upper surface
Part combustion chamber volume below and cylinder pad the above the combustion chamber volume in upper surface.
Compression ratio size is related with cylinder total volume and compressed volume of cylinder, and volume of cylinder and related components ruler
Very little correlation, the dimensional tolerance of related components will necessarily cause the fluctuation for influencing the compression ratio of engine.Traditional compression ratio is set
In meter, the tolerance of compression ratio is larger, and tolerance is greater than ± 1, and fluctuation range is big, engine power performance and warp in the compression ratio upper limit
Ji property is poor, differs larger with design value rated power, oil consumption is higher, and the engine in the compression ratio upper limit will appear light knock
Phenomenon, engine performance consistency are poor.
Summary of the invention
The object of the present invention is to provide a kind of engine compression ratio regulation method and regulation devices, to solve in the prior art
The problem of, reduce compression ratio tolerance, improves the consistency of engine performance.
The present invention provides a kind of engine compression ratio regulation method, and the engine compression ratio regulation method includes:
Step 1, the bulge quantity of each piston in the cylinder body of engine is measured respectively；
Step 2, the bulge quantity of piston is compared with preset standard, determines the cylinder pad of corresponding thickness；
Step 3, the cylinder pad is set between the cylinder body of engine and cylinder cap.
Preferably, the step 2, specifically includes:
According to the bulge quantity of each piston, average value is obtained；
If the average value is more than or equal to 0.625 millimeter and less than 0.73 millimeter, the cylinder with a thickness of 1.3 millimeters is chosen
Pad；
If the average value is more than or equal to 1.73 millimeters and less than 0.83 millimeter, the cylinder with a thickness of 1.4 millimeters is chosen
Pad；
If the average value is more than or equal to 0.83 millimeter and less than or equal to 0.935 millimeter, choose with a thickness of 1.5 millimeters
Cylinder pad.
Preferably, the thickness error of the cylinder pad of each thickness is ± 0.05 millimeter.
A kind of engine compression ratio regulation device is also provided, the engine compression ratio regulation device includes:
Measuring instrument for projection, the bulge quantity of each piston in the cylinder body for measuring engine respectively；
The controller connecting with measuring instrument for projection is determined for the bulge quantity of piston to be compared with preset standard
The cylinder pad of corresponding thickness；
Grasping mechanism connected to the controller for grabbing the cylinder pad of corresponding thickness, and the cylinder pad is set to and is started
Between the cylinder body and cylinder cap of machine.
Preferably, the engine compression ratio regulation device further include:
First sliding rail, the measuring instrument for projection are arranged on first sliding rail, and can be reciprocal along first sliding rail
Sliding；
Second sliding rail is provided with mechanical arm on second sliding rail, and the grasping mechanism is arranged on the mechanical arm, institute
It states mechanical arm to connect with controller, the mechanical arm can reciprocatingly slide along the second sliding rail.
Preferably, the engine compression ratio regulation device further includes mobile device, the mobile device and controller
Connection, for moving cylinder body.
Engine compression ratio provided by the invention regulation method and regulation device, in the cylinder body by measuring engine respectively
The bulge quantity of piston is compared by the bulge quantity of each piston with preset standard, the cylinder pad of corresponding thickness is determined, by the cylinder
Pad is set between the cylinder body of engine and cylinder cap, so as to reduce the combustion of cylinder pad holes to piston bulge quantity and the grouping of cylinder pad
Room volume tolerance is burnt, and then reduces compression ratio tolerance, the precision of compression ratio is improved, so that engine performance consistency is protected
Card；In addition, engine compression ratio regulation device avoids error caused by human factor using Automated assembly process, improve quasi-
Exactness, while the test step of piston overhang, can play the role of real-time process monitoring, avoid piston overhang not normal
Situation in range.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of engine compression ratio regulation device provided in an embodiment of the present invention.
Wherein:
1- cylinder body, 2- measuring instrument for projection, the first sliding rail of 3-, 4- controller, the second sliding rail of 5-, 6- grasping mechanism, 7- cylinder
Pad.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Embodiment one
In the embodiment of the present invention, in-cylinder combustion room volume is made of different components, since each components have public affairs
Difference, whens volume calculations, can also generate tolerance, and then cause tolerance to compression ratio.Since every partial volume is by zero of different number
Part influences, and amount of parts is more, and accumulated tolerance is bigger, and every partial volume minimum cylinder volume is of different sizes, to the shadow of compression ratio
The ratio of sound is also different.Reduction compression ratio tolerance accounts for minimum cylinder volume ratio to every partial volume tolerance first and compares and analyzes, then
Carry out the improvement being directed to.
ΔVi=ViMax-ViMin
Wherein, fi- cylinder minimum swept volume accounting, Δ Vi- volume tolerance, VcCylinder operation minimum volume.
Through theoretical calculation, f1=1.3%, f2=7.7%, f3=0.5%, f4=4.3%.
According to calculating it is found that piston combustion bowl volume and cylinder prepareding gap volume tolerance are relatively small, cylinder pad holes volume tolerance
Accounting is maximum, and the combustion chamber is taken second place.Therefore the emphasis for reducing compression ratio tolerance is to reduce cylinder pad combustion chamber volume tolerance and cylinder
Lid combustion chamber tolerance.
Through analyzing, cylinder pad combustion chamber volume tolerance is larger, mainly causes since piston bulge quantity tolerance is larger, piston is convex
Output is influenced by multiple components such as piston, piston pin, connecting rod, cylinder body, and accumulated tolerance is larger.
Specifically, the embodiment of the present invention provides a kind of engine compression ratio regulation method, the engine compression ratio regulation
Method includes:
Step 1, the bulge quantity of each piston in the cylinder body 1 of engine is measured respectively；
Step 2, the bulge quantity of piston is compared with preset standard, determines the cylinder pad 7 of corresponding thickness；
Step 3, the cylinder pad 7 is set between the cylinder body 1 of engine and cylinder cap.
Preferably, the step 2, specifically includes:
According to the bulge quantity of each piston, average value is obtained；
If the average value is more than or equal to 0.625 millimeter and less than 0.73 millimeter, the cylinder with a thickness of 1.3 millimeters is chosen
Pad 7；
If the average value is more than or equal to 1.73 millimeters and less than 0.83 millimeter, the cylinder with a thickness of 1.4 millimeters is chosen
Pad 7；
If the average value is more than or equal to 0.83 millimeter and less than or equal to 0.935 millimeter, choose with a thickness of 1.5 millimeters
Cylinder pad 7.
Preferably, the thickness error of the cylinder pad 7 of each thickness is ± 0.05 millimeter.
Specifically, it as shown in Figure 1, in the embodiment of the present invention, is proposed to solve compression ratio tolerance issues to piston bulge quantity
Piston bulge quantity is divided into three groups by grouping conception, and the three kinds of uniform configurations of corresponding design of cylinder pad 7 record data and calculate four cylinders
The average value △ h of piston bulge quantity, the thinned cylinder pad 7 of the lesser one group of apolegamy of the average value (should check piston to stop upper at this time
The when point and gap of valve, prevents piston slap valve), the cylinder pad 7 that the biggish one group of apolegamy of average value thickeies thus can be with
Guarantee no matter which kind of state depth pistion is in, can guarantee that cylinder pads 7 pore volumes near intermediate value.
For convenience of the apolegamy of cylinder pad 7, cylinder pad 7 compressed thicknesses be divided into tri- groups of states of A, B, C, respectively correspond with a thickness of 1.3mm,
1.4mm and 1.5mm selects corresponding cylinder pad 7 according to following table.
1 cylinder pad of table and piston bulge quantity corresponding relationship explanation
Engine compression ratio provided by the invention regulates and controls method, each piston in the cylinder body 1 by measuring engine respectively
Bulge quantity, the bulge quantity of piston is compared with preset standard, the cylinder pad 7 of corresponding thickness is determined, the cylinder pad 7 is arranged
Between the cylinder body 1 and cylinder cap of engine, so as to reduce the combustion chamber that cylinder pads 7 holes to piston bulge quantity and the grouping of cylinder pad 7
Volume tolerance is down to ± 0.85 by original ± 1.2, and then reduces compression ratio tolerance, and compression ratio range is controlled by 16.27-18.56
16.53-18.24 is made, the precision of compression ratio is improved, so that engine performance consistency is guaranteed.
Embodiment two
In further embodiment of this invention, after the grouping of piston bulge quantity, every engine is required to detailed measurements, people when installation
Work measures piston bulge quantity, and not only production efficiency is low, influences rhythm of production, and error is big.And difference is organized outside other cylinder pad 7
Shape is similar, and worker is also easy to take by mistake when selecting cylinder pad 7.Therefore, although this method can theoretically reduce compression ratio tolerance,
But it is difficult to realize in actual operation.The principle of association schemes one designs a kind of automation equipment, collection test and assembly one
Body, the error for avoiding manual assembly from occurring simultaneously improve production efficiency.
As shown in Figure 1, the embodiment of the present invention also provides a kind of engine compression ratio regulation device, the engine compression ratio
Regulation device includes:
Measuring instrument for projection 2, the bulge quantity of each piston in the cylinder body 1 for measuring engine respectively；
The controller 4 being connect with measuring instrument for projection 2, for the bulge quantity of piston to be compared with preset standard, really
Surely the cylinder pad 7 of thickness is corresponded to；
The grasping mechanism 6 connecting with controller 4 is set to for grabbing the cylinder pad 7 of corresponding thickness, and by the cylinder pad 7
Between the cylinder body 1 and cylinder cap of engine.
Preferably, the engine compression ratio regulation device further include:
First sliding rail 3, the measuring instrument for projection 2 are arranged on first sliding rail 3, and can be along first sliding rail 3
It reciprocatingly slides；
Second sliding rail 5, mechanical arm is provided on second sliding rail 5, and the grasping mechanism 6 is arranged in the mechanical arm
On, the mechanical arm is connect with controller 4, and the mechanical arm can reciprocatingly slide along the second sliding rail 5.
Preferably, the engine compression ratio regulation device further includes mobile device, the mobile device and controller 4
Connection, for moving cylinder body 1.
Specifically, measuring instrument for projection 2 is the prior art, and controller 4 uses computer, and handgrip can be used in grasping mechanism 6, convex
It is provided with detector on flowmeter 2 out, when which measures piston bulge quantity, rotates engine crankshaft, detector moves
To 1 top of left side cylinder body, a cylinder piston bulge quantity is tested, after, controller 4 controls measuring instrument for projection 2 along the first sliding rail 3
Sliding, respectively finishes the protrusion measuring of its excess-three the cylinder piston, and computer record data simultaneously calculate four the cylinder piston bulge quantities
Average value △ h, then computer is judged, if △ h ∈ h1, then 7 handgrips are padded by master cylinder and are grabbed from storage 7th area A Zu Gangdian
The cylinder pad 7 of one 1.3mm thickness, cylinder body 1 (by manually or mechanically) moves to right side by left side at this time, and cylinder pad 7 is placed on right side
Cylinder body 1 on, complete cylinder pad 7 assembly；Similarly, if △ h ∈ h2, then computer master cylinder pads 7 handgrips and is moved to along the second sliding rail 5
At B group cylinder pad 7, the cylinder pad 7 of the 1.4mm thickness of B group is selected；If △ h ∈ h3, then the cylinder pad 7 of C group 1.5mm thickness is selected.If △ h is not
In h1、h2And h3In range, showing error of computer is checked.
Engine compression ratio regulation device provided by the invention avoids human factor from causing using Automated assembly process
Error, improve accuracy, while the test step of piston overhang can play the role of real-time process monitoring, avoid piston
Overhang not in the normal range the case where.
Structure, feature and effect of the invention, the above institute are described in detail based on the embodiments shown in the drawings
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (6)
1. a kind of engine compression ratio regulates and controls method, which is characterized in that the engine compression ratio regulates and controls method and includes:
Step 1, the bulge quantity of each piston in the cylinder body of engine is measured respectively；
Step 2, the bulge quantity of piston is compared with preset standard, determines the cylinder pad of corresponding thickness；
Step 3, the cylinder pad is set between the cylinder body of engine and cylinder cap.
2. engine compression ratio according to claim 1 regulates and controls method, which is characterized in that the step 2 specifically includes:
According to the bulge quantity of each piston, average value is obtained；
If the average value is more than or equal to 0.625 millimeter and less than 0.73 millimeter, the cylinder pad with a thickness of 1.3 millimeters is chosen；
If the average value is more than or equal to 1.73 millimeters and less than 0.83 millimeter, the cylinder pad with a thickness of 1.4 millimeters is chosen；
If the average value is more than or equal to 0.83 millimeter and less than or equal to 0.935 millimeter, the cylinder with a thickness of 1.5 millimeters is chosen
Pad.
3. engine compression ratio according to claim 2 regulates and controls method, which is characterized in that the thickness of the cylinder pad of each thickness
Error is ± 0.05 millimeter.
4. a kind of engine compression ratio regulation device, which is characterized in that the engine compression ratio regulation device includes:
Measuring instrument for projection, the bulge quantity of each piston in the cylinder body for measuring engine respectively；
The controller connecting with measuring instrument for projection is determined and is corresponded to for the bulge quantity of piston to be compared with preset standard
The cylinder pad of thickness；
Grasping mechanism connected to the controller is set to engine for grabbing the cylinder pad of corresponding thickness, and by the cylinder pad
Between cylinder body and cylinder cap.
5. engine compression ratio regulation device according to claim 4, which is characterized in that the engine compression ratio regulation
Device further include:
First sliding rail, the measuring instrument for projection is arranged on first sliding rail, and can reciprocatingly slide along first sliding rail；
Second sliding rail is provided with mechanical arm on second sliding rail, and the grasping mechanism is arranged on the mechanical arm, the machine
Tool arm is connect with controller, and the mechanical arm can reciprocatingly slide along the second sliding rail.
6. engine compression ratio regulation device according to claim 5, which is characterized in that the engine compression ratio regulation
Device further includes mobile device, and the mobile device is connect with controller, for moving cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841013.XA CN109014871A (en) | 2018-07-27 | 2018-07-27 | A kind of engine compression ratio regulation method and regulation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841013.XA CN109014871A (en) | 2018-07-27 | 2018-07-27 | A kind of engine compression ratio regulation method and regulation device |
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| CN109014871A true CN109014871A (en) | 2018-12-18 |
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| CN201810841013.XA Pending CN109014871A (en) | 2018-07-27 | 2018-07-27 | A kind of engine compression ratio regulation method and regulation device |
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Cited By (2)
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| WO2022213603A1 (en) * | 2021-04-08 | 2022-10-13 | 浙江吉利控股集团有限公司 | Method, apparatus, and device for verifying compression ratio of engine, and storage medium |
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Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Applicant after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 No. 669 Shixin Road, Taohua Industrial Park, Hefei City, Anhui Province Applicant before: Anhui Jianghuai Automobile Group Limited by Share Ltd |
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