CN109344562A - A kind of marine diesel fuel cam lifting curve design method - Google Patents
A kind of marine diesel fuel cam lifting curve design method Download PDFInfo
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- CN109344562A CN109344562A CN201811549135.8A CN201811549135A CN109344562A CN 109344562 A CN109344562 A CN 109344562A CN 201811549135 A CN201811549135 A CN 201811549135A CN 109344562 A CN109344562 A CN 109344562A
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- cam
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The present invention relates to a kind of marine diesel fuel cam lifting curve design methods, including step 1: determining the form of segments and each piecewise function；Step 2: the main design parameters of input cam；Step 3: determining boundary condition；Step 4: the design curve of output cam.Lifting curve of the present invention is smoothly connected by piecewise polynomial function, it is calculated using the solution that the computing capability of MATLAB carries out piecewise polynomial function, recycle GUI Programming with Pascal Language Computer Aided Design, design process is integrated into a visualization interface, so that entire design process becomes visual convenience-portable, efficiently.
Description
Technical field
The invention belongs to computer software designs and technical field of mechanical design, and in particular to polynomial function cam lift
Curve Design.
Background technique
At present country's fuel cam Top-Down Design be mostly for a certain characteristic of fuel delivery or certain Certain function summary type, and
Calculating process is comparatively laborious, portable poor, in addition, cam is designed to designer's under current design condition
Designed capacity is more demanding, and designer needs to be provided simultaneously with higher cam designing technique and certain program capability, design
Personnel generally require to expend big by repeatedly cumbersome calculating, screening, check process to find a kind of reliable cam profile
The time and efforts of amount, inefficiency, error rate are also relatively high.
Summary of the invention
The purpose of the present invention is to provide a kind of marine diesel fuel cam lifting curve design methods, utilize MATLAB
The powerful computing capability of software, and keep the design process of cam profile more convenient, efficient using MATLAB GUI programming.
Technical scheme is as follows:
A kind of marine diesel fuel cam lifting curve design method, is combined using polynomial function, design process point
For four steps, referring to Fig. 1, step 1: determining the form of segments and each piecewise function；Step 2: input cam is mainly set
Count parameter；Step 3: determining boundary condition；Step 4: the design curve of output cam.
The design method described according to the present invention, step 1 mainly select cam lift molded line to be made of several sections of curves, so
It determines the form of every section of function, the i.e. order of multinomial each single item again afterwards, a complete cam is collectively constituted by each section of function
Lifting curve.
Step 2 primarily inputs the main design parameters of cam, the maximum including abscissa value, cam at each waypoint
Lift range value, cam angle when reaching pretravel and pretravel, cam angle when reaching effective travel and effective travel and convex
Wheel speed.
Step 3 is mainly to starting point, terminal point control, the control of lift points continuity, the control of velocity and acceleration continuity, tool
Be for body: starting point lift is 0, speed 0；Terminal lift is maximum lift, speed 0；Lifting curve at each waypoint
Continuous transition；Rate curve continuous transition at each waypoint；Acceleration is selectively controlled at each point according to design requirement
Continuity at section point.
Step 4 by MATLAB computing function and curve graph display function, and using graphic user interface GUI program,
Final output cam lifting curve, rate curve and accelerating curve are shown in cam design main interface visual in imagely.
Advantages of the present invention is as follows:
1, automatic detection technology of parameter, referring to fig. 2.
All input errors of user, system all can intelligently provide prompt, such as:
(1) input parameter is lack of standardization: having punctuate, letter, the nonumeric parameter in space in such as input parameter.
(2) input parameter it is unreasonable: as input parameter in each waypoint size order it is unreasonable,
(3) previously described correlation principle etc. is not met.
2, design interface is friendly, cam design process is convenient and efficient, can substantially reduce and want to the technical ability of cam designer
It asks, cam designer, which only needs to have basic cam designing technique, can be completed to fuel injection system fuel cam molded line
Design.
3, by MATLAB powerful computing capability and GUI Programming Based so that cam designer no longer need into
Row repeated multiple times cumbersome calculating and check and correction in the past, saves a large amount of time, improves efficiency and accuracy.
Detailed description of the invention
Fig. 1 is polynomial function cam lifting curve design cycle；
Fig. 2 automatic detection technology of parameter；
Fig. 3 selects segments and every section of multinomial to retain item；
Fig. 4 inputs design parameter；
The control of Fig. 5 waypoint continuity；
The output of Fig. 6 cam curve；
Fig. 7 cam lifting curve designs main interface.
Specific embodiment
Below in conjunction with the drawings and examples content that present invention be described in more detail.
Embodiment:
1. founding mathematical models
5 sections of functions of design alternative, multinomial selected by every section are respectively as follows:
y1(x)=C11x6+C13x4+C15x2+C16x+C17 (1-1)
y2(x)=C24x3+C25x2+C26x+C27 (1-2)
y3(x)=C36x+C37 (1-3)
y4(x)=C44x3+C45x2+C46x+C47 (1-4)
y5(x)=C51x6+C53x4+C54x3+C56x+C57 (1-5)
2. design driver
A) waypoint abscissa is respectively x0=0, xA=17, xB=19, xC=27, xD=30, xE=45；
B) cam maximum lift h=30；
C) reach cam angle a=18 when pretravel, pretravel hp=8；
D) reach cam angle b=28 when effective travel, effective travel he=11.5；
E) cam revolving speed n=650.
3. Boundary Condition Control
5 sections of polynomial functions amount to 20 parameters to be solved, selected boundary condition be the lift of starting point, velocity and acceleration all
It is 0；The lift of terminal is h=30, and terminal velocity and acceleration are all 0；Lift, speed and acceleration at each section of function waypoint
Degree is all continuous, and 20 effective equations are as follows:
A) pretravel governing equation: y2(a)=hp；
B) equation of effective travel control: y4(b)=he；
c)x0Place's lift, speed, acceleration governing equation are respectively as follows: y1(x0)=0；y1′(x0)=0；y1″(x0)=0；
d)xAPlace's lift, speed, acceleration continuous control equation are respectively as follows: y1(xA)=y2(xA)；y1′(xA)=y2′
(xA)；y1″(xA)=y2″(xA)；
e)xBPlace's lift, speed, acceleration continuous control equation are respectively as follows: y2(xB)=y3(xB)；y2′(xB)=y3′
(xB)；y2″(xB)=y3″(xB)；
f)xCPlace's lift, speed, acceleration continuous control equation are respectively as follows: y3(xC)=y4(xC)；y3′(xC)=y4′
(xC)；y3″(xC)=y4″(xC)；
g)xDPlace's lift, speed, acceleration continuous control equation are respectively as follows: y4(xD)=y5(xD)；y4′(xD)=y5′
(xD)；y4″(xD)=y5″(xD)；
h)xEPlace's lift, speed, acceleration governing equation are respectively as follows: y5(xE)=h；y5′(xE)=0；y5″(xE)=0
4. solving equations
Using solve function in MATLAB solve formula is as follows:
y1(x)=- 1.73 × 10-7x6+1.32×10-4x4
y2(x)=- 0.0021x3+0.121x2-1.148x+1.85
y3(x)=1.15x-12.71
y4(x)=- 0.0014x3+0.1124x2-1.883x+14.6
y5(x)=1.25 × 10-8x6-1.29×10-4x4+0.0059x3-2.754x+39.94
5. as follows using GUI design main interface design processes simplified:
(1) segments and every section of polynomial reservation item are selected, as shown in Figure 3.
(2) design parameter is inputted, as shown in Figure 4.
(3) starting point, terminal point control and waypoint lift, the control of velocity and acceleration continuity, as shown in Figure 5.
(4) cam curve exports, as shown in Figure 6.
(5) design main interface is as shown in Figure 7.
Cam lift-angle curve, speed-angle curve and the acceleration-angle curve of this method design can export aobvious
Show and and output accuracy is carried out to control and can export data as Excel spreadsheet.
The lifting curve of the design method is smoothly connected by piecewise polynomial function, is carried out using the computing capability of MATLAB
The solution of piecewise polynomial function calculates, and recycles GUI Programming with Pascal Language Computer Aided Design, design process is integrated into a visualization
In interface, so that entire design process becomes visual convenience-portable, efficiently.
Claims (6)
1. a kind of marine diesel fuel cam lifting curve design method, is combined using polynomial function, which is characterized in that packet
Include following steps: step 1: determining the form of segments and each piecewise function；Step 2: the main design parameters of input cam；Step
Rapid 3: determining boundary condition；Step 4: the design curve of output cam.
2. marine diesel fuel cam lifting curve design method according to claim 1, which is characterized in that the step
In rapid 1, polynomial function segments selects 1~5 section and every section of multinomial reservation item order 2~6 ranks of selection.
3. marine diesel fuel cam lifting curve design method according to claim 1, which is characterized in that the step
The main design parameters of rapid 2 input cam include abscissa value at each waypoint, cam maximum lift value h, reach and carry out ahead of schedule
Cam angle a and pretravel hp when journey, cam angle b and effective travel he and cam revolving speed n when reaching effective travel.
4. marine diesel fuel cam lifting curve design method according to claim 1, which is characterized in that the step
Rapid 3 determine that boundary condition includes: starting point, terminal point control, and starting point lift is 0, speed 0；The control of lift points continuity, terminal liter
Journey is maximum lift, speed 0；Velocity and acceleration continuity controls, lifting curve continuous transition at each waypoint, each
It is continuous at each waypoint to be selectively controlled acceleration according to design requirement for rate curve continuous transition at waypoint
Property.
5. marine diesel fuel cam lifting curve design method according to claim 1, which is characterized in that step 4
It is the computing function and curve graph display function by MATLAB, and is programmed using graphic user interface GUI, final output cam
Lifting curve, rate curve and accelerating curve are shown in cam design main interface visual in imagely.
6. marine diesel fuel cam lifting curve design method according to claim 1, which is characterized in that it is designed
Cam lift-angle curve, speed-angle curve and acceleration-angle curve output display and output accuracy control with
And data export as Excel spreadsheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549135.8A CN109344562B (en) | 2018-12-18 | 2018-12-18 | Marine diesel engine oil supply cam lift curve design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549135.8A CN109344562B (en) | 2018-12-18 | 2018-12-18 | Marine diesel engine oil supply cam lift curve design method |
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| Publication Number | Publication Date |
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| CN109344562A true CN109344562A (en) | 2019-02-15 |
| CN109344562B CN109344562B (en) | 2023-05-30 |
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| CN201811549135.8A Active CN109344562B (en) | 2018-12-18 | 2018-12-18 | Marine diesel engine oil supply cam lift curve design method |
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Citations (4)
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| US20050049776A1 (en) * | 2003-08-26 | 2005-03-03 | Mosier Ronald G. | Method for producing a constraint -satisfied cam acceleration profile |
| DE102010050232A1 (en) * | 2010-10-30 | 2012-05-03 | Volkswagen Ag | Method and device for controlling a valve of an internal combustion engine |
| CN106677852A (en) * | 2016-12-30 | 2017-05-17 | 北京理工大学 | Valve cam profile design method |
| CN107630729A (en) * | 2017-08-31 | 2018-01-26 | 哈尔滨工程大学 | A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method |
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2018
- 2018-12-18 CN CN201811549135.8A patent/CN109344562B/en active Active
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|---|---|---|---|---|
| US20050049776A1 (en) * | 2003-08-26 | 2005-03-03 | Mosier Ronald G. | Method for producing a constraint -satisfied cam acceleration profile |
| DE102010050232A1 (en) * | 2010-10-30 | 2012-05-03 | Volkswagen Ag | Method and device for controlling a valve of an internal combustion engine |
| CN106677852A (en) * | 2016-12-30 | 2017-05-17 | 北京理工大学 | Valve cam profile design method |
| CN107630729A (en) * | 2017-08-31 | 2018-01-26 | 哈尔滨工程大学 | A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method |
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| 张加兵等: "基于ANSYS的印刷机递纸凸轮机构运动规律优化分析", 《轻工机械》 * |
| 张可村等: "六阶光滑逼近函数的数值方法及其应用", 《数值计算与计算机应用》 * |
| 张治国等: "Matlab图形用户界面(GUI)在发动机设计中的应用", 《汽车实用技术》 * |
| 褚超美等: "基于MATLAB和C++ Builder平台的发动机凸轮型线仿真设计方法研究", 《内燃机工程》 * |
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