CN110454251A - A kind of diesel engine changeable air valve and variable-geometry compression ratio integrated system - Google Patents
A kind of diesel engine changeable air valve and variable-geometry compression ratio integrated system Download PDFInfo
- Publication number
- CN110454251A CN110454251A CN201910725724.5A CN201910725724A CN110454251A CN 110454251 A CN110454251 A CN 110454251A CN 201910725724 A CN201910725724 A CN 201910725724A CN 110454251 A CN110454251 A CN 110454251A
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- China
- Prior art keywords
- piston
- rod
- valve
- oil duct
- rod piston
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
Abstract
The present invention provides a kind of diesel engine changeable air valves and variable-geometry compression ratio integrated system, including hydraulic cylinder, the first single-rod piston, the second single-rod piston, valve and solenoid valve；The piston end of first single-rod piston can move up and down along the inner wall of the hydraulic cylinder, and being divided into rodless cavity and rod chamber from top to bottom inside the hydraulic cylinder；The piston rod inner of first single-rod piston is equipped with third oil duct, and when the first single-rod piston moves to the top, the third oil duct is communicated with the rod chamber；Second single-rod piston is arranged in the valve, and can move up and down along the inner wall of the valve, and in motion process, in the middle part of the shaft of second single-rod piston and piston crown can form the first hydraulic cavities and the second hydraulic cavities between the valve respectively.The present invention realizes the different air valve characteristics of motion and different geometrical compression ratios by controlling electro-hydraulic valve.
Description
Technical field
The invention belongs to internal-combustion engine system fields, more particularly, to a kind of diesel engine changeable air valve and variable-geometry compression ratio
Integrated system.
Background technique
Internal combustion engine is still that thermal efficiency highest, unit volume and the maximum prime mover of power-weight ratio, application are non-so far
Often extensively, however as the gradually shortage and the continuous deterioration of environmental resource of world energy sources, it would be desirable to which internal combustion engine meets more
Stringent economy and emission regulation.
Traditional combustion engine takes the camshaft actuated valve of fixed molded line, this makes the discharge of internal combustion engine and oil consumption can not
Reach best in all operating points；At the same time, researcher wish middle-low load properly increase geometrical compression ratio come into
One step improves oil consumption, and reduces geometrical compression ratio under high load capacity operating condition and avoid detonation, realizes higher power output.Therefore, greatly
More internal combustion engines all use the even variable-geometry compression ratio technique control discharge of changeable air valve technology, reduce oil consumption.
Relative to other changeable air valve technologies, the electro-hydraulic, response relatively easy without cam distribution technical pattern directly driven
Fast speed.Becoming geometrical compression ratio mode mainly has eccentric bush mode, cylinder head manner, multi link mode, variable work
Plug mode, combustion chamber volume variable manner etc..Wherein combustion chamber volume variable manner is the auxiliary piston by being arranged in cylinder
It moves back and forth and changes combustion chamber volume, compare other way, structure and control are simple, but due to occupying cylinder head base surface
Product leads to the reduction of inlet and exhaust valve area, has an adverse effect to volumetric efficiency.
For diesel engine, maximum explosive pressure is up to 20MPa or more, and general electro-hydraulic valve system pressure is in
Between 7-15MPa.
Summary of the invention
In view of this, the present invention is directed to propose a kind of diesel engine changeable air valve and variable-geometry compression ratio integrated system, lead to
It crosses and controls electro-hydraulic valve, while realizing the different air valve characteristics of motion and different geometrical compression ratios.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of diesel engine changeable air valve and variable-geometry compression ratio integrated system, including hydraulic cylinder, the first single-rod piston, the
Two single-rod pistons, valve；The piston end of first single-rod piston can move up and down along the inner wall of the hydraulic cylinder, and described in
It is divided into rodless cavity and rod chamber inside hydraulic cylinder from top to bottom；The wall surface of the hydraulic cylinder be equipped with respectively with rodless cavity and rod chamber
The outside of the first oil duct and the second oil duct of connection, first oil duct and the second oil duct is connected by solenoid valve and external oil sources
It connects；The piston rod inner of first single-rod piston is equipped with third oil duct, and one end is connected to its piston rod bottom end face, and the other end connects
The side of logical piston rod, when the first single-rod piston moves to the top, the third oil duct is communicated with the rod chamber；It is described
It is fixedly connected at the top of the tailpiece of the piston rod of first single-rod piston and the valve；Second single-rod piston is arranged in the valve
It is interior, and can move up and down along the inner wall of the valve, in motion process, the shaft middle part of second single-rod piston and piston
Head can form the first hydraulic cavities and the second hydraulic cavities between the valve respectively；Second single-rod piston is axially inside
Equipped with the 4th oil duct, the 4th oil duct both ends are communicated with the third oil duct and the second hydraulic cavities respectively；Second single pole
Internal piston is radially provided with the 5th oil duct of connection the first hydraulic cavities and the 4th oil duct.
Further, the piston rod of second single-rod piston includes the different first segment and second segment of diameter, far from living
The diameter for filling in the first segment at end is greater than the diameter of second segment, be equipped in the valve inner cavity cooperated with first segment and second segment and
Hierarchic structure, the second single-rod piston during the motion, form the first hydraulic cavities at hierarchic structure.
Further, the piston rod of second single-rod piston is equipped with piston end junction and is connected to the 4th oil duct and second
The groove of the annular of hydraulic cavities.
Further, the solenoid valve is three position four-way electromagnetic valve, external high pressure and low pressure oil sources, high pressure fuel source pressure
Less than maximum combustion pressure in cylinder of diesel engine.
Compared with the existing technology, present invention has the advantage that
The present invention realizes the different air valve characteristics of motion and different geometrical compression ratios, structure by controlling electro-hydraulic valve
Relatively easy with controlling, integration degree is high, is not take up cylinder head base areas, does not have an adverse effect to volumetric efficiency.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram when embodiment of the present invention is in valve opening state；
Fig. 2 is the schematic diagram when embodiment of the present invention is in valve-closing state (geometrical compression ratio is variable)；
Fig. 3 is the schematic diagram of solenoid valve and external high-low pressure oil sources in the embodiment of the present invention.
Description of symbols:
1. hydraulic cylinder, 2. first single-rod pistons, 3. third oil ducts, 4. second single-rod pistons, 5. first hydraulic cavities, 6. the 4th
Oil duct, 7. second hydraulic cavities, 8. valves, 9. the 5th oil ducts, 10. second oil ducts, 11. first oil ducts, 12. solenoid valves.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1 to Figure 3, the present embodiment system includes hydraulic cylinder 1, the first single-rod piston 2, the second single-rod piston 4, gas
Door 8；
The piston end of first single-rod piston 2 can move up and down along the inner wall of the hydraulic cylinder 1, and the hydraulic cylinder
It is divided into rodless cavity and rod chamber inside 1 from top to bottom；1 wall surface of hydraulic cylinder is equipped with the first oil duct 11 and the second oil duct 10, institute
The outside both ends for stating the first oil duct 11 and second oil duct 10 are connect with solenoid valve 12, and the solenoid valve 12 is 3-position 4-way electricity
Magnet valve is connect by three position four-way electromagnetic valve with external oil sources, inside both ends respectively with the rodless cavity and the rod chamber phase
It is logical；
The piston rod inner of first single-rod piston 2 is equipped with third oil duct 3, and one end is connected to its piston rod bottom end face,
The other end is connected to the side of piston rod, and when the first single-rod piston 2 moves to the top, the third oil duct 3 has bar with described
Chamber communicates；
The tailpiece of the piston rod of first single-rod piston 2 is fixedly connected with the top of the valve 8；
Second single-rod piston 4 is arranged in the valve 8, and can move up and down along the inner wall of the valve 8, moves
In the process, the shaft middle part of second single-rod piston 4 and piston crown can form the first liquid between the valve 8 respectively
Press chamber 5 and the second hydraulic cavities 7；Second single-rod piston 4 is axially inside equipped with the 4th oil duct 6,6 both ends of the 4th oil duct
It is communicated respectively with the third oil duct 3 and the second hydraulic cavities 7；Second single-rod piston, 4 inner radial is equipped with the first liquid of connection
Press the 5th oil duct 9 of chamber 5 and the 4th oil duct 6.
The piston rod of second single-rod piston 4 includes the different first segment and second segment of diameter, the far from piston end
One section of diameter is greater than the diameter of second segment, and the inner cavity cooperated with first segment and second segment and ladder knot are equipped in the valve 8
Structure, the second single-rod piston 4 during the motion, form the first hydraulic cavities 5 at hierarchic structure；The height of first hydraulic cavities 5
Limit the maximum distance that second single-rod piston 4 moves up and down along 8 inner wall of valve.
The piston rod of second single-rod piston 4 and piston end junction are equipped with the groove of annular, realize the 4th oil duct 6 with
The connection of second hydraulic cavities 7.
The external high pressure of the three position four-way electromagnetic valve and low pressure oil sources, high pressure fuel source pressure are less than highest combustion in cylinder of diesel engine
Burn pressure.
The course of work of the present embodiment is as follows:
When the solenoid valve 12 is in upper function, as shown in Figure 1, first oil duct 11 and high pressure fuel source phase at this time
Logical, second oil duct 10 is communicated with low pressure oil sources, and under the action of hydraulic coupling, first single-rod piston 2 moves downward reality
Existing valve opening.
When the solenoid valve 12 is in the next function, first oil duct 11 is communicated with low pressure oil sources at this time, and described the
Two oil ducts 10 are communicated with high pressure fuel source, and under the action of hydraulic coupling, first single-rod piston 2 is moved upwards, and valve starts back
It falls, until valve-closing, as shown in Figure 2.At this point, the first single-rod piston 2 move to topmost, the third oil duct 3 with it is described
Rod chamber is communicated and then is communicated with high pressure fuel source, and when just being closed due to valve, engine in-cylinder pressure is lower, in the work of hydraulic coupling
Under, second single-rod piston 4 is moved downward relative to the valve 8, and 5 volume of the first hydraulic cavities is progressively smaller until to be 0,
Base position before changing at this time as geometrical compression ratio, since the second single-rod piston 4 protrudes outward maximum, burn Interior Space
Between it is minimum, correspond to maximum geometrical compression ratio.As the pressure in engine cylinder increases, especially steeply rise when burnt
When pressure is more than high pressure fuel source pressure, under comprehensive function power, second single-rod piston 4 is transported upwards relative to the valve 8
Dynamic, 5 volume of the first hydraulic cavities is gradually increased, and geometrical compression ratio is gradually reduced, when reaching predetermined geometrical compression ratio position, at this time
It controls the solenoid valve 12 and is in Median Function, first oil duct 11 is in an off state with second oil duct 10, geometry
Compression ratio solidification.
Zhou Erfu turns as a result, carries out the open and close of valve.
Since geometrical compression ratio has base position, by calibration, Geometric compression can be realized using opened loop control
The accurate control of ratio, control are simple.
To sum up, by controlling the upper function of the solenoid valve 12 and the switching moment of the next function, it can realize gas
The change of the door characteristics of motion can also be achieved the variable of geometrical compression ratio further by the switching of control Median Function.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of diesel engine changeable air valve and variable-geometry compression ratio integrated system, it is characterised in that: including hydraulic cylinder (1), the
One single-rod piston (2), the second single-rod piston (4) and valve (8)；
The piston end of first single-rod piston (2) can move up and down along the inner wall of the hydraulic cylinder (1), and the hydraulic cylinder
(1) internal to be divided into rodless cavity and rod chamber from top to bottom；The wall surface of the hydraulic cylinder (1) be equipped with respectively with rodless cavity and rod chamber
The first oil duct (11) and the second oil duct (10) of connection pass through electromagnetism on the outside of first oil duct (11) and the second oil duct (10)
Valve (12) is connect with external oil sources；
The piston rod inner of first single-rod piston (2) is equipped with third oil duct (3), and one end is connected to its piston rod bottom end face,
The other end be connected to piston rod side, when the first single-rod piston (2) moves to the top, the third oil duct (3) with it is described
Rod chamber communicates；
It is fixedly connected at the top of the tailpiece of the piston rod of first single-rod piston (2) and the valve (8)；
Second single-rod piston (4) setting can move up and down in the valve (8) along the inner wall of the valve (8), transport
During dynamic, in the middle part of the shaft of second single-rod piston (4) and piston crown can be formed between the valve (8) respectively
First hydraulic cavities (5) and the second hydraulic cavities (7)；Second single-rod piston (4) is axially inside equipped with the 4th oil duct (6), institute
The 4th oil duct (6) both ends are stated to communicate with the third oil duct (3) and the second hydraulic cavities (7) respectively；Second single-rod piston (4)
Inner radial is equipped with the 5th oil duct (9) of connection the first hydraulic cavities (5) and the 4th oil duct (6).
2. system according to claim 1, it is characterised in that: the piston rod of second single-rod piston (4) includes diameter
Different first segments and second segment, the diameter of the first segment far from piston end are greater than the diameter of second segment, set in the valve (8)
Have with first segment and second segment cooperation inner cavity and hierarchic structure, the second single-rod piston (4) during the motion, at hierarchic structure
Form the first hydraulic cavities (5).
3. system according to claim 1, it is characterised in that: the piston rod and piston end of second single-rod piston (4)
Junction is equipped with the groove of the annular of the 4th oil duct (6) of connection and the second hydraulic cavities (7).
4. system according to claim 1, it is characterised in that: the solenoid valve (12) is three position four-way electromagnetic valve, outside
High pressure and low pressure oil sources are connect, high pressure fuel source pressure is less than maximum combustion pressure in cylinder of diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725724.5A CN110454251B (en) | 2019-08-07 | 2019-08-07 | Variable valve and variable geometric compression ratio integrated system of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725724.5A CN110454251B (en) | 2019-08-07 | 2019-08-07 | Variable valve and variable geometric compression ratio integrated system of diesel engine |
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| Publication Number | Publication Date |
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| CN110454251A true CN110454251A (en) | 2019-11-15 |
| CN110454251B CN110454251B (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910725724.5A Active CN110454251B (en) | 2019-08-07 | 2019-08-07 | Variable valve and variable geometric compression ratio integrated system of diesel engine |
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| DE19727584C1 (en) * | 1997-06-28 | 1998-10-08 | Daimler Benz Ag | Compression brake for internal combustion engine |
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| CN107060935A (en) * | 2017-03-24 | 2017-08-18 | 中国北方发动机研究所(天津) | A kind of hydraulic pressure variable valve device |
| CN107676144A (en) * | 2017-09-30 | 2018-02-09 | 中国北方发动机研究所(天津) | A kind of 2/4 Stroke Engine hydraulic variable valve mechanism |
| CN108506063A (en) * | 2018-03-05 | 2018-09-07 | 中国北方发动机研究所(天津) | A kind of two or four stroke hydraulic variable valve mechanism of no valve spring engine |
| US20190078499A1 (en) * | 2016-01-14 | 2019-03-14 | Nautilus Engineering, Llc | Systems and methods of compression ignition engines |
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2019
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Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19727584C1 (en) * | 1997-06-28 | 1998-10-08 | Daimler Benz Ag | Compression brake for internal combustion engine |
| CN102859132A (en) * | 2010-04-21 | 2013-01-02 | 丰田自动车株式会社 | Internal combustion engine |
| JP2013234628A (en) * | 2012-05-10 | 2013-11-21 | Toyota Motor Corp | Combustion chamber volume adjusting method and engine manufacturing method |
| CN103670663A (en) * | 2012-09-11 | 2014-03-26 | 窦斌 | Sleeved air valve structure for changing internal combustion engine combustion chamber volume |
| CN103216290A (en) * | 2013-04-09 | 2013-07-24 | 江苏公大动力技术有限公司 | Variable lift driver |
| CN104727955A (en) * | 2013-12-18 | 2015-06-24 | 现代自动车株式会社 | Variable compression ratio engine |
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| CN107060935A (en) * | 2017-03-24 | 2017-08-18 | 中国北方发动机研究所(天津) | A kind of hydraulic pressure variable valve device |
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| CN110454251B (en) | 2020-11-06 |
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