CN112855357B - Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method - Google Patents
Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method Download PDFInfo
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- CN112855357B CN112855357B CN202110094377.8A CN202110094377A CN112855357B CN 112855357 B CN112855357 B CN 112855357B CN 202110094377 A CN202110094377 A CN 202110094377A CN 112855357 B CN112855357 B CN 112855357B
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- connecting rod
- internal combustion
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- combustion engine
- crank lever
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- 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
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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)
- Transmission Devices (AREA)
Abstract
The invention relates to the field of internal combustion engines, in particular to a mechanism with a variable piston stroke and a variable compression ratio of an internal combustion engine and a control method. The specific technical scheme of the invention is as follows: the displacement mechanism is assembled on the hinged part of the piston connecting rod and the crankshaft crank lever connecting rod, and is used for changing the position of a force application point, so that one end of a power arm of the crankshaft crank lever connecting rod is prolonged, the moment obtained by the stress point of the crankshaft crank is larger as the lever is longer, and simultaneously the piston stroke is prolonged and the compression ratio is increased, so that the internal combustion engine obtains larger torque output.
Description
Technical Field
The invention relates to the field of internal combustion engines, in particular to a mechanism with a variable piston stroke and a variable compression ratio of an internal combustion engine and a control method.
Background
The internal combustion engine is a power mechanism, the piston stroke of the existing piston internal combustion engine is fixed and invariable, and the requirement under complex working conditions cannot be met. The internal combustion engine used by the vehicle is more suitable, the internal combustion engine used by the vehicle at present is mainly selected according to the type and the use condition of the vehicle, the matching is not ideal, the requirements of the vehicle under different road conditions and different working conditions cannot be met, and the problems of energy waste, environmental pollution, insufficient torque and the like are caused.
Disclosure of Invention
The invention aims to provide an internal combustion engine which can meet different environmental conditions and different working conditions, and can be switched between high torque, high rotating speed and energy conservation according to requirements, so that the internal combustion engine is perfectly matched with the use requirements, and in order to achieve the purpose, the specific technical scheme of the invention is as follows:
a variable piston stroke and variable compression ratio internal combustion engine mechanism and control method, can be controlled by the internal combustion engine control computer (ECU) when changing the piston stroke and compression ratio, can also be controlled manually according to the demand, the variable piston stroke and variable compression ratio mechanism of the internal combustion engine includes the piston, the piston connecting rod, the crank lever connecting rod, the dynamic balance block, the crank, the piston connecting rod and the crank lever connecting rod articulated portion of the displacement mechanism, the swing connecting rod, the piston connecting rod and the crank lever connecting rod articulated portion of the displacement drive device of the crank lever connecting rod articulated portion of the displacement mechanism, the link gear, one end of the piston connecting rod and the piston are articulated, another end and crank lever connecting rod of the crankshaft power arm one end of the articulated portion, the piston connecting rod and the crank lever connecting rod of the crankshaft are equipped with the displacement mechanism, the displacement mechanism can move the force application point of the power arm to one side of the far end of the crank shaft, and can also move to the crank shaft direction, so as to change the position of the force application point.
When the force application point of the hinged part of the piston connecting rod and the crankshaft crank lever connecting rod moves towards the crankshaft crank direction, a lever at one end of a power arm of the crankshaft crank lever connecting rod is shortened, the piston stroke is reduced, the compression ratio is reduced, the internal combustion engine can obtain higher rotating speed, and the requirement on high rotating speed of the internal combustion engine is met.
The crankshaft crank mounting hole on the crankshaft crank lever connecting rod is assembled on a crank of the crankshaft to serve as a stress point, the piston connecting rod is pushed when the piston does work, the piston connecting rod transmits the thrust of the piston doing work to the force application point at one end of the power arm of the crankshaft crank lever connecting rod, the other end of the crankshaft crank lever connecting rod is hinged with the swinging connecting rod, and the other end of the swinging connecting rod is hinged with the cylinder body. Because the swinging connecting rod can only swing left and right, the upper part and the lower part are limited as fulcrums, the swinging connecting rod prizes the crankshaft crank positioned at the stress point of the crankshaft crank lever connecting rod to move downwards, and the rotating motion of the crankshaft crank pushed is used as power to be output outwards. The length of the lever at one end of the power arm of the crank lever connecting rod of the crankshaft and the distance of the piston stroke are the key of how much torque can be output by the internal combustion engine.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention
FIG. 2 is a schematic view of the displacement mechanism and piston position of the present invention
In figure 1, a 1-piston, a 2-piston connecting rod, a 3-displacement mechanism, a 4-displacement mechanism driving device, a 5-dynamic balance block, a 6-crankshaft crank lever connecting rod, a 7-crankshaft crank, an 8-swinging connecting rod, a 9-cylinder body hinging part and a 10 linkage device
Detailed Description
The invention is further described with reference to the following figures and detailed description:
example (b):
as shown in fig. 1 to 10, a variable piston stroke and variable compression ratio mechanism of an internal combustion engine includes a piston 1 and a piston rod 2, wherein the piston 1 and the piston rod 2 are similar to those in common. And the shifting mechanism 3 is arranged on a hinged part of one end of a power arm of a crankshaft crank lever connecting rod 6 and a piston connecting rod. In the figure, an eccentric shaft is taken as an embodiment of the displacement mechanism 3, the top dead center of a piston is 0 degree, when the axis of one end of an eccentric hole points to 55 degrees (as shown in 3 in figure 2), the distance between a force application point and a crankshaft crank 7 is the shortest, a power arm is shortened, the stroke of the piston 1 is the shortest, and the internal combustion engine can run at a high rotating speed. When the top dead center of the piston is 0 degree, when the axis at one end of the eccentric hole rotates clockwise to the lowest position and is at a position of 180 degrees (as shown in 2 in figure 2), the compression ratio is minimum at the moment, and the internal combustion engine is suitable for running under a low-load working condition, when the top dead center of the piston is 0 degree, when the axis at one end of the eccentric hole rotates clockwise to 235 degrees (as shown in 1 in figure 2), the distance between the force application point of the hinged part of the piston connecting rod 2 and the crank-lever connecting rod 6 and the crank 7 is farthest, the lever at one end of the power arm is extended, the stroke of the piston 1 is increased while the lever is extended, the compression ratio is increased, and the internal combustion engine can output larger torque.
The axis of one end of the eccentric hole of the eccentric shaft of the shifting mechanism 3 rotates clockwise or counterclockwise between 55 degrees and 235 degrees, and the above data is only used for explaining the working principle of the shifting mechanism 3 of the present case and does not limit the type of the shifting mechanism 3. The displacement motion of the displacement mechanism 3 is driven by the displacement driving device 4 to perform the displacement motion, and the displacement mechanism 3 is driven to move to a position corresponding to the requirement by controlling the displacement driving device 4. The shifting mechanism 3 moves while the dynamic balance block 5 is linked to move in the direction opposite to the force application point on the shifting mechanism 3, one end of the dynamic balance block 5 is hinged to one side of the power arm of the crank lever connecting rod 6 of the crankshaft, and a linkage device 10 is assembled between the dynamic balance block 5 and the shifting mechanism 3 to form reverse linkage. The crankshaft crank mounting hole of the crankshaft crank lever connecting rod 6 is assembled on the crankshaft crank 7 and serves as a stress point, the other end of the crankshaft crank lever connecting rod 6 serves as a fulcrum to be hinged with the swinging connecting rod 8, the other end of the swinging connecting rod 8 is hinged with the cylinder body hinged portion 9, and the cylinder body hinged portion 9 is located below the crankshaft and is fixed with the cylinder body to the right.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes, modifications, equivalents, and improvements may be made without departing from the spirit and scope of the invention.
Claims (5)
1. The variable piston stroke and variable compression ratio mechanism of the internal combustion engine comprises a piston (1), a piston connecting rod (2), a shifting mechanism (3), a shifting driving device (4), a dynamic balance block (5), a crankshaft crank lever connecting rod (6), a crankshaft crank (7), a swinging connecting rod (8), a cylinder body hinging part (9) and a linkage device (10), and is characterized in that the shifting mechanism (3), the shifting mechanism (3) are assembled on the hinging part of the piston connecting rod (2) and the crankshaft crank lever connecting rod (6), the linkage device (10) assembled on the shifting mechanism (3) and the dynamic balance block (5) on one side are assembled in a linkage mode, and the other side of the shifting mechanism (3) is assembled with a power output end of the shifting driving device (4) in a linkage mode.
2. The mechanism of variable piston stroke and variable compression ratio of an internal combustion engine as claimed in claim 1, characterized in that the crank lever connecting rod (6) is a crank lever connecting rod (6), one end of the power arm of the crank lever connecting rod (6) is hinged with the piston connecting rod (2), the hinged part is assembled with the shifting mechanism (3), the other end of the crank lever connecting rod (6) is hinged with the swinging connecting rod (8), the other end of the swinging connecting rod (8) is hinged with the cylinder body hinged part (9), the cylinder body hinged part (9) is fixedly assembled with the cylinder body, the crank assembling hole on the crank lever connecting rod (6) is assembled on the crank (7), the crank lever connecting rod (6) is assembled with the shifting driving device (4) which is positioned at one side of the crank (7) assembling hole, one side of the shifting mechanism (3) on the crank lever connecting rod (6) is assembled with the dynamic balance weight (5), and the linkage device (10).
3. The mechanism for variable piston stroke and variable compression ratio of an internal combustion engine according to claim 1, characterized in that the displacement driving device (4), the displacement driving device (4) is assembled on the crank connecting rod (6) and is positioned at one side of the crank connecting rod (6), the power output end of the displacement driving device (4) is assembled with the displacement mechanism in a linkage way, and the displacement driving device (4) is controlled by the computer (ECU) of the internal combustion engine.
4. The mechanism of variable piston stroke and variable compression ratio of an internal combustion engine as claimed in claim 1, characterized in that the dynamic balance weight (5), the linkage (10) is arranged between the dynamic balance weight (5) and the shifting mechanism (3), the dynamic balance weight (5) is hinged with the crank lever connecting rod (6), and the crank lever connecting rod (6) is provided with a hinged part which is positioned at one side of the shifting mechanism (3).
5. The mechanism of variable piston stroke and variable compression ratio of an internal combustion engine according to claim 1, characterized in that the linkage (10) is respectively assembled on the shifting mechanism (3) and the dynamic balance weight (5), and the shifting mechanism (3) and the dynamic balance weight (5) are assembled in a reverse linkage manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110094377.8A CN112855357B (en) | 2021-01-24 | 2021-01-24 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110094377.8A CN112855357B (en) | 2021-01-24 | 2021-01-24 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
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| Publication Number | Publication Date |
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| CN112855357A CN112855357A (en) | 2021-05-28 |
| CN112855357B true CN112855357B (en) | 2023-04-18 |
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| CN112855357A (en) | 2021-05-28 |
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