CN110173349A - A kind of variable compression ratio engine and its control method - Google Patents
A kind of variable compression ratio engine and its control method Download PDFInfo
- Publication number
- CN110173349A CN110173349A CN201910540975.6A CN201910540975A CN110173349A CN 110173349 A CN110173349 A CN 110173349A CN 201910540975 A CN201910540975 A CN 201910540975A CN 110173349 A CN110173349 A CN 110173349A
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- shaft support
- compression ratio
- crankshaft
- curved shaft
- top dead
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- 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
- F02B75/047—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of variable crankshaft position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of variable compression ratio engine and its control methods, mainly include VCR motor, upper case body, lower case body, upper limit position groove, lower limit slot, upper Curved shaft support, lower Curved shaft support, line shaft, bevel gear, internal screw thread bevel gear, threaded support axle, crankshaft shaft coupling, line shaft shaft coupling, top dead centre displacement sensor and other conventional engine existing structures.ECU obtains top dead centre displacement by top dead centre displacement sensor, calculate actual compression ratio m and compared with optimal compression ratio ε under the current speed of crankshaft demarcated in advance, control VCR motor drives the bevel gear on line shaft to engage with internal screw thread bevel gear, promotion is located at the intracorporal upper and lower Curved shaft support of upper and lower cabinet and moves in upper and lower limits slot, change piston top dead center position, optimal compression ratio is realized, to reach the accurate control of engine compression ratio continuous variable.
Description
Technical field
The present invention relates to conventional engine more particularly to variable compression ratio engines.
Background technique
The compression ratio of conventional engine refers to that combustion chamber volume and piston are located at upper stop when piston is located at lower dead center
The ratio between combustion chamber volume when point.The thermal efficiency of cycle of engine can be significantly improved by improving compression ratio, in the item that output work is constant
Under part, improving thermal efficiency of cycle and being equivalent to reduces oil consumption and carbon emission.But the raising of compression ratio be not without restriction because
Element, gasoline engine compression ratio is limited by the critical compression ratio of pinking generation, and diesel engine is limited by the mechanical strength and cost of material.
The mainly fixed compression ratio formula engine of available engine in the market, and the practical air inflow and distributive value of engine are with revolving speed
Very big with load variations range, fixed compression ratio cannot guarantee that mechanical strength obtains good utilization well.It is existing variable
Compression ratio technique is broadly divided into following several types: becoming piston length, becomes length of connecting rod, become crankshaft length, become Curved shaft support position
It sets.Ratios are achieved the purpose that by inside and outside piston relative motion as disclosed in CN108757206A, inside and outside piston
The variation of position change bring chamber structure has larger journey to the problems such as air motion of in-cylinder combustion, thermic load and cooling
The influence of degree；Big end is changed according to control eccentric gear as disclosed in CN107829818A and the eccentric of crankshaft junction connects
It connects, quality is increased on rotary body, bring unfavorable factor to dynamic balancing and reduction vibration noise.
Summary of the invention
The purpose of the present invention is to overcome the disadvantages of the prior art, provides a kind of realization compression ratio continuous variable, control essence
Spend high variable compression ratio engine and its control method.
A kind of variable compression ratio engine of the invention, lower case body including engine and is fixed on lower case body
Upper case body is equipped with multiple lower Curved shaft supports of left and right parallel interval setting, in each lower song in the lower case body
Support is provided with a upper Curved shaft support respectively in axis support, and the rear and front end of multiple lower Curved shaft supports is upper respectively to glide
It is dynamic to be connected in the lower limit slot opened up on antetheca and rear wall in lower case body, multiple left and right parallel intervals settings it is described upper
The rear and front end of Curved shaft support is slided up and down respectively in the upper limit position groove for being connected to and opening up on antetheca and rear wall in upper case body, institute
The upper limit position groove depth stated is less than lower limit groove depth；
The front and back end length of lower Curved shaft support is greater than the front and back end length of upper Curved shaft support, on the top of each lower Curved shaft support
An arc mounting groove, the upper and lower two arc installations being correspondingly arranged are had among wall and among upper Curved shaft support bottom wall
Slot docks the bearing shell mounting groove to be formed and be coincide with the bearing shell shape of crankshaft, and the top bearing shell of each crankshaft bearing liner is mounted on crankshaft branch
In the arc mounting groove of support and lower bearing is mounted in the arc mounting groove on lower Curved shaft support, and a crankshaft installed is multiple
Between the upper and lower bearing shell of bearing shell；
A rectangular recess is inwardly provided among the bottom wall of each lower Curved shaft support, in the centre of each lower Curved shaft support
It is provided with a connection through-hole along the vertical direction, is mounted on a threaded support axle, the screw thread in each connection through-hole
The bottom of support shaft is fixed on the bottom wall of lower case body, and internal screw thread cone is connected in the threaded support axle for being located at concave part position
Gear, the internal screw thread bevel gear is threadedly coupled by self-locking type trapezoidal thread with threaded support axle, in the lower case
The installation of crankshaft shaft coupling is had among the roof of the left and right sidewall of body and among the bottom wall of the left and right sidewall of upper case body
Slot is mounted on a crankshaft shaft coupling, a left side for the crankshaft shaft coupling and crankshaft in each crankshaft shaft coupling mounting groove
Right both ends are fixedly linked respectively, and a through-hole is provided on the right side wall of lower case body, is installed in the through-hole dynamic
Axis shaft coupling, top dead centre displacement sensor uses slider type linear displacement transducer, in the side wall of the lower Curved shaft support of the rightmost side
On the slipper of top dead centre displacement sensor is installed, the fixed part of the top dead centre displacement sensor is fixedly mounted on
On the boss of the lower limit slot of the rightmost side；
All lower Curved shaft support passes through the line shaft arranged in the horizontal direction and is fixedly linked, and fixes in the line shaft
There is the bevel gear that cooperation is engaged with each internal screw thread bevel gear, described line shaft one end is solid by line shaft shaft coupling and one
The output shaft for being scheduled on the VCR motor of external engine is connected.
The control method of variable compression ratio engine, comprising the following steps:
The first step demarcates electric current-work of engine speed-piston optimal compression ratio arteries and veins spectrogram and top dead centre displacement sensor
Dead-centre position arteries and veins spectrogram beyond the Great Wall, and currently practical compression ratio will be calculated there are in ECU；
Second step, ECU obtains present engine revolving speed according to current crankshaft position sensor parameter, according to present engine
Revolving speed reads optimal compression ratio ε under the current rotating speed demarcated in advance in engine speed-piston optimal compression ratio arteries and veins spectrogram；
ECU reads electric current-piston top dead center position arteries and veins spectrogram of top dead centre displacement sensor according to the electric current of top dead centre displacement sensor
In piston top dead center displacement, obtain the practical top dead center position of current working lower piston, calculate the practical pressure under current working
Than m, and by the currently practical compression ratio of calculating, there are in ECU for contracting；
Third step, ECU compares the numerical relation of ε and m, and as ε > m, ECU control VCR motor rotation successively drives line shaft
Shaft coupling, line shaft, bevel gear, internal screw thread Bevel Gear Transmission make lower Curved shaft support, upper Curved shaft support, crankshaft towards cylinder cap direction
Mobile, m value becomes larger；As ε < m, ECU controls the rotation of VCR motor and successively drives line shaft shaft coupling, line shaft, bevel gear, interior
Screw thread Bevel Gear Transmission makes lower Curved shaft support, upper Curved shaft support, bent mobile axially away from cylinder cap direction, m value reduction；As ε=m
When, ECU controls VCR motor stalls, and Curved shaft support stops movement at present for this, in interior screw thread bevel gear and threaded support between centers
Self-locking thread under the action of be parked in the position of required compression ratio ε.
Compared with prior art, the invention has the following advantages:
The size of the rotation time of VCR motor, the relative distance of rotation direction control crankshaft and cylinder cap is controlled by ECU,
Judge whether compression ratio reaches the expected compression ratio of change by top dead centre displacement sensor.Top dead centre displacement sensor should have
The function of detecting the variation of top dead centre relative position, is a kind of slider type linear displacement transducer, the limiting slot in upper case body removes
Curved shaft support is removable outer in guarantee, also the limiting device as lower Curved shaft support, mainly by under the limiting slot ratio of upper case body
The shallow processing dimension of the limiting slot of box body realizes that when guaranteeing that top dead centre displacement sensor is out of order, Curved shaft support will not nothing
Limitation moves up.
The present invention realizes compression ratio continuous variable by simple structure, is changed using threads turn control compression ratio, control
Precision height processed.Do not change the existing mature component such as chamber structure and crank link mechanism, to available engine structure change compared with
It is small, it is smaller to engine cost impact.
Detailed description of the invention
Fig. 1 is a kind of lower case body structure schematic top plan view of variable compression ratio engine of the present invention；
Fig. 2 is a kind of upper case body structure elevational schematic view of variable compression ratio engine of the present invention；
Fig. 3 is a kind of partial left side view of variable compression ratio engine structural schematic diagram of the present invention；
A kind of variable compression ratio engine control flow chart of the position Fig. 4 present invention.
Specific embodiment
The present invention is explained further below with reference to embodiment and attached drawing, but not in this, as to the application protection scope
Restriction.
The present invention is the improvement in available engine structure, and in addition to the structure shown in Fig. 1, Fig. 2, Fig. 3, remaining is all made of existing
There is structure.
The present invention is a kind of variable compression ratio engine as shown in drawings, lower case body 6 and fixation including engine
Upper case body 13 on lower case body 6 is equipped with multiple lower songs of left and right parallel interval setting in the lower case body 6
Axis support 1, support is provided with a upper Curved shaft support 15, multiple lower crankshaft branch respectively on each lower Curved shaft support 1
The rear and front end of support 1 is slided up and down respectively in the lower limit slot 8 for being connected to and opening up on antetheca and rear wall in lower case body 6, multiple
The rear and front end of the upper Curved shaft support 15 of left and right parallel interval setting slides up and down respectively to be connected in upper case body 13
In the upper limit position groove 14 opened up on antetheca and rear wall, the 14 depth L of upper limit position groove is less than 8 depth of lower limit slot.It is running
The height that Curved shaft support 1 is moved upward to highest point under controlling in the process is not higher than 8 height of lower limit slot, so that lower Curved shaft support
1 can only move up and down in lower limit slot 8, can not move in upper limit position groove 14.
The front and back end length of lower Curved shaft support 1 is greater than the front and back end length of upper Curved shaft support 15, in each lower Curved shaft support 1
Roof among and 15 bottom wall of upper Curved shaft support among have an arc mounting groove, upper and lower two arcs being correspondingly arranged
Shape mounting groove docks the bearing shell mounting groove to be formed and be coincide with 12 shape of bearing shell of crankshaft, the upper axis of each crankshaft bearing liner 12
It watt is mounted in the arc mounting groove of Curved shaft support 15 and lower bearing is mounted on the arc mounting groove on lower Curved shaft support 1
In, a crankshaft 16 is mounted between the upper and lower bearing shell of multiple bearing shells 12.Crankshaft is then connect with connecting rod, and connecting rod is connect with piston,
Connection type is the prior art, and connecting rod, piston are not drawn in the figure.
It is inwardly provided with a rectangular recess among the bottom wall of each lower Curved shaft support 1, in each lower Curved shaft support 1
Between be provided with a connection through-hole along the vertical direction, be mounted on a threaded support axle 7, the spiral shell in each connection through-hole
The bottom of line support shaft 7 is fixed on the bottom wall of lower case body 6, is connected in the threaded support axle 7 for being located at concave part position interior
Screw thread bevel gear 5, the internal screw thread bevel gear 5 is threadedly coupled by self-locking type trapezoidal thread with threaded support axle 7, described
Lower case body 6 left and right sidewall roof among and upper case body 13 left and right sidewall bottom wall among have crankshaft
Shaft coupling mounting groove 2 is mounted on a crankshaft shaft coupling 11, the crankshaft shaft coupling in each crankshaft shaft coupling mounting groove
The left and right ends of device and crankshaft are fixedly linked respectively, and in use process, one of crankshaft shaft coupling is connected with belt pulley with band
The attachmentes such as dynamic starting motor, another crankshaft shaft coupling can be connected as power output end with clutch or dynamometer machine etc..
The crankshaft shaft coupling connect with crankshaft, with the connection of power end and to be connected with belt pulley be the prior art, use is existing
Structure.It is provided with a through-hole on the right side wall of lower case body 6, line shaft shaft coupling is installed in the through-hole
10.Top dead centre displacement sensor 9 uses slider type linear displacement transducer, pacifies on the side wall of the lower Curved shaft support 1 of the rightmost side
The fixed part of slipper equipped with top dead centre displacement sensor 9, the top dead centre displacement sensor is fixedly mounted on most
On the boss of the lower limit slot 8 on right side, the relative displacement of the slipper and fixed part of the sensor is exactly Curved shaft support
Displacement, that is, the displacement of piston top dead center.
All lower Curved shaft support 1 is fixedly linked by the line shaft 3 arranged in the horizontal direction, in the line shaft 3
It is fixed with the bevel gear 4 that cooperation is engaged with each internal screw thread bevel gear 5, described 3 one end of line shaft passes through line shaft shaft coupling
The output shaft of the 10 VCR motors for being fixed on external engine with one is connected, and VCR motor is existing servo motor, connection type
Using existing structure.
The work course of the present apparatus is as follows:
VCR motor rotates under ECU control, and the power of generation is transmitted on line shaft 3 solid by line shaft shaft coupling 10
On fixed bevel gear 4, bevel gear 4 engages with internal screw thread bevel gear 5, and internal screw thread bevel gear 5 passes through self-locking type trapezoidal thread and spiral shell
Line support shaft 7 connects, and internal screw thread bevel gear 5 can rotate under the drive of VCR motor around threaded support axle 7 and Curved shaft support under pushing
1 and upper Curved shaft support 15 moved up and down in lower limit slot 8 and upper limit position groove 14, on lower Curved shaft support 1 and upper Curved shaft support 15
Equipped with crankshaft bearing liner 12 and crankshaft 16, crankshaft 16 is connected with connecting rod, and connecting rod is connected with piston, when ECU control VCR motor rotation
When, piston top dead center position changes, to realize the change of engine compression ratio.
Cylinder fuel burning pushes piston mobile, and piston pushes connecting rod, and connecting rod band dynamic crankshaft 16 rotates, and crankshaft 16 passes through song
Axis shaft coupling 11 is connected with the clutch of external engine realizes power output.
Control method (control leads figure and sees Fig. 4) of the invention the following steps are included:
Compared with existing calibrating parameters, control method of the present invention the following steps are included:
The first step demarcates electric current-work of engine speed-piston optimal compression ratio arteries and veins spectrogram and top dead centre displacement sensor
Dead-centre position arteries and veins spectrogram beyond the Great Wall.
Second step, ECU obtains present engine revolving speed according to current crankshaft position sensor parameter, according to present engine
Revolving speed reads optimal compression ratio ε under the current rotating speed demarcated in advance in engine speed-piston optimal compression ratio arteries and veins spectrogram；
ECU reads electric current-piston top dead center position arteries and veins spectrogram of top dead centre displacement sensor according to the electric current of top dead centre displacement sensor 9
In piston top dead center displacement x, obtain the practical top dead center position of current working lower piston, calculate the practical pressure under current working
Than m, and by the currently practical compression ratio of calculating, there are in ECU for contracting.
Each physical quantity and symbol, unit are corresponding such as the following table 1 when compression ratio does not change:
1. physical quantity of table, unit, symbol description
Equivalent clearance: at piston top dead center to the distance of cylinder cap and piston crater volume divided by quotient obtained by piston area it
With.
Regulation: top dead centre displacement is x.
Currently practical compression ratio is at this time
Third step, ECU compares the numerical relation of ε and m, and as ε > m, ECU control VCR motor rotation successively drives line shaft
Shaft coupling 10, line shaft 3, bevel gear 4, internal screw thread bevel gear 5 transmission make lower Curved shaft support 1, upper Curved shaft support 15, crankshaft 16 to
Cylinder cap direction it is mobile, m value becomes larger；As ε < m, ECU controls the rotation of VCR motor and successively drives line shaft shaft coupling 10, power
Axis 3, bevel gear 4, internal screw thread bevel gear 5 are driven, and make lower Curved shaft support 1, upper Curved shaft support 15, crankshaft 16 to far from cylinder cap direction
Mobile, m value reduces；As ε=m, ECU controls VCR motor stalls, and Curved shaft support 1 stops movement at present for this, in internal screw thread
The position of required compression ratio ε is parked under the action of self-locking thread between bevel gear 5 and threaded support axle 7.
Claims (2)
1. a kind of variable compression ratio engine, what it is including engine lower case body (6) and the upper case that is fixed on lower case body
Body (13), it is characterised in that: multiple lower Curved shaft supports of left and right parallel interval setting are installed in the lower case body,
Each support is provided with one upper Curved shaft support (5), the front and back two of multiple lower Curved shaft supports respectively on lower Curved shaft support
End is slided up and down respectively in the lower limit slot (8) for being connected to and opening up on antetheca and rear wall in lower case body, between multiple left and right are parallel
It is slided up and down respectively every the rear and front end of the upper Curved shaft support (5) of setting and is connected to upper case body (3) interior antetheca with after
In the upper limit position groove (4) opened up on wall, the upper limit position groove depth is less than lower limit groove depth；
The front and back end length of lower Curved shaft support is greater than the front and back end length of upper Curved shaft support (15), on the top of each lower Curved shaft support
An arc mounting groove, the upper and lower two arc installations being correspondingly arranged are had among wall and among upper Curved shaft support bottom wall
Slot docks the bearing shell mounting groove to be formed and be coincide with the bearing shell shape of crankshaft, and the top bearing shell of each crankshaft bearing liner (12) is mounted on song
In the arc mounting groove of axis support and lower bearing is mounted in the arc mounting groove on lower Curved shaft support (1), a crankshaft (1)
It is mounted between the upper and lower bearing shell of multiple bearing shells；
A rectangular recess is inwardly provided among the bottom wall of each lower Curved shaft support, in the centre of each lower Curved shaft support along perpendicular
Histogram is mounted on a threaded support axle (7), the screw thread branch to a connection through-hole is provided in each connection through-hole
The bottom of support axis is fixed on the bottom wall of lower case body, and internal screw thread cone tooth is connected in the threaded support axle for being located at concave part position
Wheel, the internal screw thread bevel gear (5) is threadedly coupled by self-locking type trapezoidal thread with threaded support axle (7), under described
Crankshaft connection is had among the roof of the left and right sidewall of box body and among the bottom wall of the left and right sidewall of upper case body (13)
Axis device mounting groove (2) is mounted on a crankshaft shaft coupling (11), the crankshaft connection in each crankshaft shaft coupling mounting groove
The left and right ends of axis device and crankshaft are fixedly linked respectively, and a through-hole is provided on the right side wall of lower case body, lead in described
It is equipped in hole line shaft shaft coupling (10), top dead centre displacement sensor (9) uses slider type linear displacement transducer, most right
The slipper of top dead centre displacement sensor is installed, the top dead centre, which is displaced, to be passed on the side wall of the lower Curved shaft support (1) of side
The fixed part of sensor is fixedly mounted on the boss of lower limit slot (8) of the rightmost side；
All lower Curved shaft support (1) is fixedly linked by the line shaft (3) arranged in the horizontal direction, solid in the line shaft
Surely there is the bevel gear (4) that cooperation is engaged with each internal screw thread bevel gear (5), described line shaft one end passes through line shaft shaft coupling
The output shaft for the VCR motor for being fixed on external engine with one is connected.
2. the control method of variable compression ratio engine according to claim 1, it is characterised in that the following steps are included:
The first step is determined on electric current-piston of engine speed-piston optimal compression ratio arteries and veins spectrogram and top dead centre displacement sensor only
Point position arteries and veins spectrogram；
Second step, ECU obtains present engine revolving speed according to current crankshaft position sensor parameter, according to present engine revolving speed
Read optimal compression ratio ε under the current rotating speed demarcated in advance in engine speed-piston optimal compression ratio arteries and veins spectrogram；ECU root
In the electric current-piston top dead center position arteries and veins spectrogram for reading top dead centre displacement sensor according to the electric current of top dead centre displacement sensor (9)
Piston top dead center displacement, obtain the practical top dead center position of current working lower piston, calculate the actual compression under current working
Than m, and by the currently practical compression ratio of calculating, there are in ECU；
Third step, ECU compares the numerical relation of ε and m, and as ε > m, ECU controls the rotation of VCR motor and successively drives line shaft shaft coupling
Device (10), line shaft (3), bevel gear (4), internal screw thread bevel gear (5) transmission make lower Curved shaft support (1), upper Curved shaft support (15),
Crankshaft (1) is mobile towards cylinder cap direction, and m value becomes larger；As ε < m, ECU controls the rotation of VCR motor and successively drives line shaft shaft coupling
Device (10), line shaft (3), bevel gear (4), internal screw thread bevel gear (5) transmission, make lower Curved shaft support (1), upper Curved shaft support
(15), to far from the movement of cylinder cap direction, m value reduces crankshaft (1)；As ε=m, ECU controls VCR motor stalls, this is at present
Curved shaft support (1) stops movement, and self-locking thread between interior screw thread bevel gear (5) and threaded support axle (7) under the action of is parked in
The position of required compression ratio ε.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910540975.6A CN110173349B (en) | 2019-06-21 | 2019-06-21 | Variable compression ratio engine and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910540975.6A CN110173349B (en) | 2019-06-21 | 2019-06-21 | Variable compression ratio engine and control method thereof |
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| Publication Number | Publication Date |
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| CN110173349A true CN110173349A (en) | 2019-08-27 |
| CN110173349B CN110173349B (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910540975.6A Active CN110173349B (en) | 2019-06-21 | 2019-06-21 | Variable compression ratio engine and control method thereof |
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| CN114352430A (en) * | 2022-01-10 | 2022-04-15 | 重庆佳瑞斯科技有限公司 | Variable compression ratio piston assembly |
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| CN114352430A (en) * | 2022-01-10 | 2022-04-15 | 重庆佳瑞斯科技有限公司 | Variable compression ratio piston assembly |
| CN114352430B (en) * | 2022-01-10 | 2022-12-13 | 诸暨市博惠汽车配件有限公司 | Variable compression ratio piston assembly |
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| Publication number | Publication date |
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| CN110173349B (en) | 2023-09-12 |
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