CN113669170B - Engine compression ratio adjusting method and device - Google Patents
Engine compression ratio adjusting method and device Download PDFInfo
- Publication number
- CN113669170B CN113669170B CN202110911890.1A CN202110911890A CN113669170B CN 113669170 B CN113669170 B CN 113669170B CN 202110911890 A CN202110911890 A CN 202110911890A CN 113669170 B CN113669170 B CN 113669170B
- Authority
- CN
- China
- Prior art keywords
- engine
- compression ratio
- exhaust
- pressure
- cylinder
- Prior art date
- 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.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- 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 method and a device for adjusting the compression ratio of an engine, which pressurize waste gas in a combustion cylinder of the engine and then introduce the pressurized waste gas into a control cylinder of the engine; the position control of the piston in the engine control cylinder is realized by charging and discharging waste gas in the upper chamber and the lower chamber in the engine control cylinder. The invention not only can realize different compression ratio requirements under different working conditions, but also has simple structure and low energy consumption.
Description
Technical Field
The invention belongs to the technical field of engines with variable compression ratios, and particularly discloses a method and a device for adjusting the compression ratio of an engine.
Background
The existing vehicle is carried with fuel oil or gas piston engine, which is widely used because of small volume and large power, the traditional engine adds turbocharging technology in order to obtain larger power requirement without changing volume, but the compression volume of the engine is not changed, when the air inlet pressure is continuously increased, the cylinder pressure of the engine is increased, which is very easy to cause the explosion danger in the operation process of the engine, the existing first proposal is variable compression ratio technology, the working principle is that a wedge-shaped slide block is arranged between a cylinder body and a cylinder cover, so that the relative position of a combustion chamber and the top surface of a piston is changed, thereby changing the compression volume and the compression ratio, but the structure is complex, the positions and the shapes of the cylinder body and the cylinder cover are required to be changed, and the manufacture and the later maintenance operation of the engine are not facilitated.
The second scheme of the prior art is that an eccentric ring is added into a big end of a crankshaft connecting rod and is controlled to rotate through a gear, so that the top dead center position of a piston is changed, the compression ratio is changed, but the processing requirement of the technology on a crankshaft is high, the mechanism for connecting the crankshaft with the eccentric ring is complex, the crankshaft and the gear and the mechanism for connecting the eccentric ring inside the crankshaft are easily damaged due to insufficient strength when the crankshaft rotates at a high speed, the maintenance and replacement cost is high, and the later-stage application is not facilitated.
The third existing scheme is that a set of multi-link mechanism and a control shaft are additionally arranged on an original crank-link mechanism, the position of the multi-link mechanism changes to enable the position of the top dead center of a piston to change, but the mechanism needs an additional linkage structure to drive, the structure is more and huge, when the mechanism is applied to a multi-cylinder engine, the volume and the weight of the engine can be increased, and the variable end of the multi-link mechanism is installed on a crankshaft, so that additional unbalanced vibration can be caused when the crankshaft runs at a high speed, the integral strength of the mechanism is reduced, the comfort of a vehicle is reduced, and the mechanism is not beneficial to large-scale application.
Chinese invention patent CN101688473A discloses an electro-hydraulic device for controlling the compression ratio of a variable compression ratio engine, which comprises at least one two-way electronic valve with a non-check valve, the electronic valve being capable of opening and closing at least one hydraulic pipeline between an upper chamber and a lower chamber of a control jack; at least one position sensor to control the rack; an angular position sensor of a crankshaft of the engine for adjusting a compression ratio; and at least one computer. The force on the control rack changes direction periodically depending on the speed and load at which the variable compression ratio engine is operated. Thus, the pressure in the upper chamber of the control jack is periodically higher and lower than the pressure in the lower chamber of the control jack. In order to optimize the efficiency, the torque, or to reduce the polluting emissions of a variable compression ratio engine, when a reduction in the compression ratio is required, the electronic valve for reducing the compression ratio is commanded to open by the computer, the control rack being moved in one or more stages, taking into account the force exerted on the control rack and the ratcheting effect produced by the check valve arranged on the same duct as the electronic valve which is kept open, until the position sensor of the control rack indicates to the computer that the position of the control rack corresponds correctly to the required compression ratio. The hydraulic supply device used by the invention has the defects of more parts, complex structure and high cost.
The chinese invention patent CN107725306a discloses an engine hydraulic pressure supply device, which is used for providing a driving force, when an outlet pressure is smaller than a set control pressure, a single-point pressure detection unit is in a first state, and a motor control unit is controlled to drive a motor to work, so as to drive an oil pump to operate, so that engine oil flows in from an inlet and flows out from an outlet, and the outlet pressure is increased; when the outlet pressure is greater than or equal to the set control pressure, the single-point pressure detection unit is in a second state, and at the moment, a delay control module on the motor control unit continues to drive the motor to work for a period of time in a delayed manner according to the set delay duration and then stops, so that the outlet pressure continuously rises; by adjusting the time delay, the outlet pressure can be accurately controlled within the required pressure range. Although the hydraulic control device of the present invention is used for changing or stabilizing the compression ratio of the engine, the hydraulic supply device needs to operate the motor and the oil pump to pressurize the engine oil in the main oil gallery of the engine in order to provide high-pressure oil, and the operation of the motor and the oil pump consumes electric energy and increases energy consumption and fuel consumption.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method and a device for adjusting the compression ratio of an engine, which can meet different compression ratio requirements under different working conditions, and have the advantages of simple structure and low energy consumption.
The invention discloses a method for adjusting the compression ratio of an engine, which comprises the steps of pressurizing waste gas in a combustion cylinder of the engine and then introducing the pressurized waste gas into a control cylinder of the engine; the position control of the piston in the engine control cylinder is realized by charging and discharging waste gas in the upper chamber and the lower chamber in the engine control cylinder.
The invention also discloses an engine compression ratio adjusting device, which comprises an engine, wherein the engine comprises a combustion cylinder and a control cylinder, the combustion cylinder is communicated with the control cylinder through a first pipeline, the first pipeline is serially connected with a one-way valve, the first pipeline is parallelly connected with a second pipeline and a third pipeline, the second pipeline is serially connected with a pressure accumulator, and the third pipeline is serially connected with a safety valve and a pressure relief opening.
In a preferred embodiment of the present invention, an inlet of the pipeline is communicated with the exhaust passage of the combustion cylinder, an outlet of the pipeline is communicated with the control cylinder through a solenoid valve, and two outlet ends of the solenoid valve are respectively communicated with an upper chamber and a lower chamber in the engine control cylinder.
In a preferred embodiment of the invention, the one-way valve is located upstream of the accumulator.
In a preferred embodiment of the invention, the accumulator is located upstream of the safety valve.
In a preferred embodiment of the invention, the safety valve is located upstream of the pressure relief port.
In a preferred embodiment of the present invention, the pressure relief port is in communication with an exhaust pipe.
In a preferred embodiment of the present invention, the surfaces of the first pipe, the second pipe, the third pipe, and the accumulator are coated with a heat insulating coating.
In a preferred embodiment of the invention, a spring capable of controlling the piston to be positioned at the top dead center of the piston and ensuring the low compression ratio/low expansion ratio requirement in the starting stage of the engine is coaxially sleeved on the piston in the engine control cylinder.
In a preferred embodiment of the invention, the surfaces of the upper and lower cavities of the piston in the engine control cylinder are coated with a heat insulating coating.
The invention has the beneficial effects that: the invention adopts air pressure control, has the advantages of simple structure and low cost, and simultaneously utilizes the advantages that high-temperature and high-pressure waste gas formed after combustion in the combustion chamber enters the compression ratio adjusting device for pressurization, and the up-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, thereby meeting the requirements of different compression ratios under different working conditions under the condition of not consuming extra energy, effectively utilizing the waste heat of the engine and reducing the energy consumption.
Drawings
FIG. 1 is a schematic illustration of an engine compression ratio adjustment apparatus of the present invention;
in the figure, 1-combustion cylinder; 2-a control cylinder; 3-a first pipeline; 4-a one-way valve; 5-a second pipeline; 6-a third pipeline; 7-a pressure accumulator; 8-safety valve; 9-a pressure relief port; 10-an upper chamber; 11-a lower chamber; 12-a solenoid valve; 13-a spring; 1.1-air inlet channel; 1.2-exhaust passage;
Detailed Description
The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings and by way of illustration of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a method for adjusting the compression ratio of an engine, which pressurizes waste gas in a combustion cylinder 1 of the engine and then introduces the pressurized waste gas into a control cylinder 2 of the engine; the piston displacement in the engine control cylinder 2 is realized by charging and discharging the waste gas in the upper chamber 10 and the lower chamber 11 in the engine control cylinder 2.
The invention also discloses an engine compression ratio adjusting device, according to an ideal gas law pV = nRT, gas with the same mass is coated with heat insulation coatings on the surfaces of an upper cavity and a lower cavity of a control piston in a certain space, the temperature is higher, the pressure is higher, so as to keep the gas temperature in the upper cavity and the lower cavity and reduce the gas supplementing requirement, the engine comprises an engine, the engine comprises a combustion cylinder 1 and a control cylinder 2, the combustion cylinder 1 is communicated with the control cylinder 2 through a first pipeline 3, the first pipeline 3 is provided with a one-way valve 4 in series, the first pipeline 3 is provided with a second pipeline 55 and a third pipeline 6 in parallel, the second pipeline 55 is provided with a pressure accumulator 7 in series, and the third pipeline 6 is provided with a safety valve 8 and a pressure relief port 9 in series.
Preferably, the inlet of the first pipeline 3 is communicated with the exhaust passage 1.2 of the combustion cylinder 1, the outlet of the first pipeline 3 is communicated with the control cylinder 2 through a solenoid valve 12, and two outlet ends of the solenoid valve 12 are respectively communicated with an upper chamber 10 and a lower chamber 11 in the engine control cylinder 2.
Preferably, the non-return valve 4 is located upstream of the accumulator 7.
Preferably, the pressure accumulator 7 is located upstream of the safety valve 8.
Preferably, the safety valve 8 is located upstream of the pressure relief vent 9.
Preferably, the pressure relief port 9 communicates with the exhaust pipe.
Preferably, the surfaces of the first pipe 3, the second pipe 55, the third pipe 6, and the accumulator 7 are coated with a heat insulating coating.
Preferably, the piston in the engine control cylinder 2 is coaxially sleeved with a spring 13 capable of controlling the piston to be positioned at the top dead center thereof and ensuring the requirements of low compression ratio/low expansion ratio in the starting stage of the engine, and the spring 13 can enable more exhaust energy to be used for pressurizing the compression ratio adjusting device and heating the catalyst.
Preferably, the upper and lower cavity surfaces of the piston in the engine control cylinder 2 are coated with a heat insulating coating.
FIG. 1 of the present invention shows the compression ratio adjusting device of the present application, the safety valve and the previous pipeline need to be coated with heat insulation coating, the other pipelines and the inner surface of the pressure accumulator are coated with heat insulation coating to keep the gas temperature therein, the pressurizing device between the combustion cylinder 1 and the control cylinder 2 comprises an inlet, an outlet, a pressure accumulator, a safety valve and a pressure relief port, the function and the working principle of the pressurizing device are the same as those in CN 107725306A; the inlet of the pressurizing device is connected with the outlet of the exhaust manifold, high-temperature and high-pressure waste gas formed after combustion in the combustion chamber enters the pressurizing device for pressurization through the exhaust valve, the cylinder cover exhaust passage and the exhaust manifold in an exhaust stroke, when the pressure in the pressure accumulator reaches the limit value of the safety valve, the safety valve is opened, and redundant exhaust gas enters the exhaust pipe through the pressure relief port; meanwhile, the electromagnetic valve at the position of the control cylinder works as required, and the up-and-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, so that the change or the stability of the compression ratio is realized.
The specific working process is as follows:
1) And (3) during the starting stage of the engine: the electromagnetic valve at the control cylinder is closed, the control piston is positioned at the top dead center position under the action of the spring, and the engine is in a state of low compression ratio/low expansion ratio, so that the engine is easy to start on one hand, and on the other hand, more exhaust energy can enter the compression ratio adjusting device for pressurization through the exhaust valve, the exhaust passage of the cylinder cover and the exhaust manifold. When the pressure in the pressure accumulator reaches the limit value of the safety valve, the safety valve is opened, and redundant exhaust enters the exhaust pipe through the pressure relief port. After an oxygen sensor of the exhaust pipe detects an exhaust signal, the ECU judges that the pressure accumulation in the compression ratio adjusting device reaches the standard, the electromagnetic valve at the control cylinder can work as required, and the up-and-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, so that the change or the stability of the compression ratio is realized.
2) And (3) during the engine operation stage: if the oxygen sensor of the exhaust pipe cannot detect the exhaust signal for a long time, the instrument panel needs to display a maintenance icon and give out warning sound to remind a driver of checking or maintaining as soon as possible (internal pipeline leakage, failure in pressure accumulation, sensor or transmission failure and the like).
The variable compression ratio adjusting device of the engine adopts air pressure control, has a simple structure and reduces the cost; in addition, the high-temperature and high-pressure waste gas formed after combustion in the combustion chamber enters the compression ratio adjusting device to be pressurized, and the up-and-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, so that the change or the stability of the compression ratio is realized, the waste heat of the engine can be effectively utilized, and the energy consumption is reduced.
(1) The nuclear core point of this proposal lies in that the high temperature high pressure waste gas that utilizes the burning production in the combustion chamber gets into and presses the ratio adjusting device and pressurize, through the gaseous inflation, the gassing of control upper and lower intracavity to the realization is to the control of piston up-and-down motion in the cylinder, thereby under the condition of not consuming extra energy, satisfies the different compression ratio demands under the different operating modes.
(2) In the proposal, the air pressure control refers to a process of using high-temperature and high-pressure waste gas generated in a combustion chamber of a cylinder for a variable compression ratio adjusting device of an engine to adjust the compression ratio of the engine, and does not refer to a process of burning mixed gas to release heat energy in the working stroke of the cylinder, and the high-temperature and high-pressure gas pushes a piston to move from a top dead center to a bottom dead center.
(3) Most of the variable compression ratio adjusting devices of the engines in the prior art are hydraulic adjusting devices, and air pressure adjusting devices are not conventional technical means in the field. Meanwhile, in the prior art, the exhaust gas after combustion is secondarily used as Exhaust Gas Recirculation (EGR), and the purpose of EGR is to achieve secondary combustion of exhaust gas, or layered combustion and lean combustion, thereby improving the emission performance of the engine while reducing fuel consumption. Therefore, the air pressure controlled engine variable compression ratio adjustment device in the present proposal is not a conventional technical means in the art.
It should be understood that the above-mentioned embodiments are merely exemplary of the present invention, and not restrictive, and that any modifications, combinations, substitutions, improvements, etc. made within the spirit and scope of the present invention are included in the present invention.
Claims (5)
1. A method for adjusting the compression ratio of an engine is characterized in that: the engine comprises a combustion cylinder and a control cylinder, wherein the combustion cylinder is communicated with the control cylinder through a first pipeline, a one-way valve is arranged on the first pipeline in series, a second pipeline and a third pipeline are arranged on the first pipeline in parallel, a pressure accumulator is arranged on the second pipeline in series, a safety valve and a pressure relief opening are arranged on the third pipeline in series, an inlet of the first pipeline is communicated with an exhaust passage of the combustion cylinder, an outlet of the first pipeline is communicated with the control cylinder through an electromagnetic valve, two outlet ends of the electromagnetic valve are respectively communicated with an upper chamber and a lower chamber in the engine control cylinder, a spring capable of controlling a piston to be positioned on the piston and ensuring the requirements of low compression ratio and low expansion ratio in the starting stage of the engine is coaxially sleeved on the piston in the engine control cylinder, heat insulation coatings are coated on the surfaces of the first pipeline, the second pipeline, the third pipeline and the pressure accumulator, heat insulation coatings are coated on the upper and lower chambers of the piston in the engine control cylinder, according to ideal gas pV = nRT, gases with the same quality are introduced into a certain space, the heat insulation coatings are coated on the upper and lower surfaces of the upper and lower chambers of the control cylinder, the heat insulation coatings are used for reducing the pressure of the exhaust gases, and the engine control cylinder, and the exhaust gases are used for reducing the engine control cylinder; the position control of a piston in an engine control cylinder is realized by charging and discharging waste gas in an upper chamber and a lower chamber in the engine control cylinder; the pressurizing device positioned between the combustion cylinder (1) and the control cylinder (2) comprises an inlet, an outlet, a pressure accumulator, a safety valve and a pressure relief port; the inlet of the pressurizing device is connected with the outlet of the exhaust manifold, high-temperature and high-pressure waste gas formed after combustion in the combustion chamber enters the pressurizing device for pressurization through the exhaust valve, the cylinder cover exhaust passage and the exhaust manifold in an exhaust stroke, when the pressure in the pressure accumulator reaches the limit value of the safety valve, the safety valve is opened, and redundant exhaust gas enters the exhaust pipe through the pressure relief port; meanwhile, the electromagnetic valve at the cylinder is controlled to work as required, and the up-and-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, so that the change or the stability of the compression ratio is realized; the air pressure control refers to the process that high-temperature and high-pressure waste gas generated in a combustion chamber of the cylinder is used for a variable compression ratio adjusting device of the engine to adjust the compression ratio of the engine, and does not refer to the process that in the working stroke of the cylinder, mixed gas is combusted to release heat energy, and high-temperature and high-pressure gas pushes a piston to move from a top dead center to a bottom dead center,
1) And (3) during the starting stage of the engine: the electromagnetic valve at the control cylinder is closed, the control piston is positioned at the top dead center position under the action of the spring, and the engine is in a state of low compression ratio/low expansion ratio, so that the engine is easy to start on one hand, and on the other hand, more exhaust energy can enter a compression ratio adjusting device for pressurization through an exhaust valve, a cylinder cover exhaust passage and an exhaust manifold; when the pressure in the pressure accumulator reaches the limit value of the safety valve, the safety valve is opened, redundant exhaust enters the exhaust pipe through the pressure relief port, the ECU judges that the pressure accumulation in the compression ratio adjusting device reaches the standard after an oxygen sensor of the exhaust pipe detects an exhaust signal, the electromagnetic valve at the control cylinder works as required at the moment, and the up-and-down movement or fixation of the piston is allowed to be controlled by controlling the inflation and deflation of the gas in the upper cavity and the lower cavity, so that the change or the stability of the compression ratio is realized;
2) And (3) during the engine operation stage: if the oxygen sensor of the exhaust pipe cannot detect the exhaust signal for a long time, the instrument panel needs to display a maintenance icon and give out warning sound to remind a driver to check or maintain as soon as possible.
2. The engine compression ratio adjusting method according to claim 1, characterized in that: the check valve is located upstream of the accumulator.
3. The engine compression ratio adjusting method according to claim 1, characterized in that: the accumulator is located upstream of the relief valve.
4. The engine compression ratio adjusting method according to claim 1, characterized in that: the relief valve is located upstream of the relief port.
5. The engine compression ratio adjusting method according to claim 1, characterized in that: the pressure relief port is communicated with the exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911890.1A CN113669170B (en) | 2021-08-10 | 2021-08-10 | Engine compression ratio adjusting method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911890.1A CN113669170B (en) | 2021-08-10 | 2021-08-10 | Engine compression ratio adjusting method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113669170A CN113669170A (en) | 2021-11-19 |
| CN113669170B true CN113669170B (en) | 2023-02-24 |
Family
ID=78541991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110911890.1A Active CN113669170B (en) | 2021-08-10 | 2021-08-10 | Engine compression ratio adjusting method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113669170B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688473A (en) * | 2007-04-16 | 2010-03-31 | 维亚内·拉比 | Hydroelectric device for closed-loop driving the control jack of a variable compression rate engine |
| CN203214178U (en) * | 2013-02-22 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Variable compression engine |
| CN104405502A (en) * | 2014-10-16 | 2015-03-11 | 上海鲁交测控科技有限公司 | Variable engine capacity system of air discharge pressure control type |
| CN107313856A (en) * | 2016-04-27 | 2017-11-03 | 上海汽车集团股份有限公司 | Cylinder head, engine and its control method, control module and automobile |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7588000B2 (en) * | 2006-09-05 | 2009-09-15 | Harry Bruce Crower | Free piston pressure spike modulator for any internal combustion engine |
| KR100922830B1 (en) * | 2009-03-12 | 2009-10-20 | 기검 | Apparatus for connecting sucking valve with exhaustvalve for an internal combustion engine |
-
2021
- 2021-08-10 CN CN202110911890.1A patent/CN113669170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688473A (en) * | 2007-04-16 | 2010-03-31 | 维亚内·拉比 | Hydroelectric device for closed-loop driving the control jack of a variable compression rate engine |
| CN203214178U (en) * | 2013-02-22 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Variable compression engine |
| CN104405502A (en) * | 2014-10-16 | 2015-03-11 | 上海鲁交测控科技有限公司 | Variable engine capacity system of air discharge pressure control type |
| CN107313856A (en) * | 2016-04-27 | 2017-11-03 | 上海汽车集团股份有限公司 | Cylinder head, engine and its control method, control module and automobile |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113669170A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7958864B2 (en) | Compression ignition engines and methods | |
| US8327831B2 (en) | Dual fuel compression ignition engines and methods | |
| CN101466933B (en) | Spark ignition type internal combustion engine | |
| CN102725494B (en) | Special homogeneous charge compression ignition engine | |
| Trajkovic et al. | Investigation of different valve geometries and valve timing strategies and their effect on regenerative efficiency for a pneumatic hybrid with variable valve actuation | |
| CN107288701B (en) | Two-stroke compression release type auxiliary braking device and method for engine | |
| US20090199789A1 (en) | On demand, stored, positive pressurized air injection for internal combustion engines combustion chambers | |
| Trajkovic et al. | Introductory study of variable valve actuation for pneumatic hybridization | |
| KR20080042149A (en) | A two-stroke engine with variable compression | |
| CN201144731Y (en) | Four-stage variable inlet manifold | |
| Kang et al. | Demonstration of air-power-assist (APA) engine technology for clean combustion and direct energy recovery in heavy duty application | |
| CN113669170B (en) | Engine compression ratio adjusting method and device | |
| CN105257357B (en) | The automatically controlled quick valve valve variable timing of bimorph and valve variable lift device and control method | |
| CN201144740Y (en) | Mixing valve of gas engine | |
| CN111120090B (en) | Energy storage type power device | |
| CN212054817U (en) | Two-stroke compressed air engine, automobile driving system and power generation system | |
| Postrioti et al. | Application of a fully flexible electro-hydraulic camless system to a research SI engine | |
| CN209523804U (en) | Flexible fuel engine | |
| CN103244289B (en) | Pneumatics controls gas flow formula diesel oil/liquefied petroleum gas (LPG) mixture burning control system | |
| CN210317487U (en) | Engine without crankshaft | |
| CN108730014B (en) | Engine and automobile | |
| CN216008677U (en) | Compression ignition engine and vehicle | |
| CN215761938U (en) | Combined engine | |
| TWI580860B (en) | Air pressure control gas flow diesel / liquefied petroleum gas mixed with energy saving and carbon reduction system | |
| US20060207242A1 (en) | Lightweight engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |