CN108868943A - Using two or the four stroke switching method of engine of the full changeable air valve of electromagnetism - Google Patents
Using two or the four stroke switching method of engine of the full changeable air valve of electromagnetism Download PDFInfo
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- CN108868943A CN108868943A CN201810598225.XA CN201810598225A CN108868943A CN 108868943 A CN108868943 A CN 108868943A CN 201810598225 A CN201810598225 A CN 201810598225A CN 108868943 A CN108868943 A CN 108868943A
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- stroke
- engine
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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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- 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
Abstract
The invention discloses a kind of two or four stroke switching methods of engine using the full changeable air valve of electromagnetism, can switch stroke mode according to actual condition；In low- load conditions, engine can be switched to four-stoke mode operation, to realize optimal fuel economy；Under high load capacity operating condition, engine can be switched to two-stroke mode operation, to improve the dynamic property of engine；And engine does not need to be driven by means of other hydraulic machineries in stroke mode handoff procedure, structure is simple, utilization rate is high.
Description
Technical field
The present invention relates to two or the four stroke switching methods of engine of the application full changeable air valve of electromagnetism.
Background technique
Under the conditions of urban traffic situation, four-stroke engine rate of load condensate only has 20%-40%, and in order to meet engine in automobile
The demand of larger load, engine must lay in certain stand-by power when designing in the short time such as climbing, acceleration, this is resulted in
The economy of engine is poor.The working principle of two stroke engine and four-stroke difference, rotate a circle in crankshaft
A work done can be completed in movement, therefore, compared with the four-stroke engine of same discharge capacity, power is its 1.5-1.7 times.If
Two-stroke and the two different operating modes of four strokes are combined on an engine, sufficiently improved under four stroke operation modes
Its rate of load condensate, to achieve the purpose that improve its economy；And under two stroke operation mode, to meet it in a short time to big
The demand of power has taken into account the economy and dynamic property of engine for the purpose of dynamic property in this way.
There are mainly three types of the schemes for realizing stroke changeable technology at present：The first is that there are two types of strokes for configuration on the engine
Cylinder, i.e. multi-cylinder modality for co-operation, motor usage ratio is low, increases the weight and cost of engine；Second is a set of match
Gas system can meet two-stroke and four-stroke distribution simultaneously, two-stroke distribution molded line is machined on camshaft, four strokes are matched
Gas molded line and the excessive molded line of switching, change the position of variable cam in the way of hydraulic or is Mechanical Driven, have come
At the switching of two-stroke distribution and four stroke distributions, design and difficulty of processing are higher, and controllability is low；The third is rushed to tradition four
Journey engine carries out structure change, and side air intake duct and exhaust duct are provided on the outside of cylinder, its opening and closing is controlled by solenoid valve,
Switching device is provided on rocker arm to convert stroke mode, this scheme makes motor mechanisms complicated, and there are valve controls not
The problems such as enough accurate.
Summary of the invention
The purpose of the present invention is to provide a kind of two or four stroke switching method of engine using the full changeable air valve of electromagnetism,
Stroke mode can be switched according to actual condition.
To achieve the above object, the technical scheme is to design a kind of engines two using the full changeable air valve of electromagnetism
Four stroke switching methods, the engine are four-stroke engine, and inlet valve, the exhaust valve of engine all use electromagnetism to can be changed entirely
Valve；
Engine electric-controlled unit works according to current stroke scheme control inlet valve, exhaust valve, spark plug and fuel injector, makes to start
Machine continuous service under current stroke mode state；The current stroke mode is four-stoke mode or two-stroke mode；
And electronic control unit judges current working according to the signal that multiple sensors upload,
When judge current working be high load capacity operating condition, and current stroke mode be four-stoke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under four-stoke mode to be terminated, and at the end of previous cycle compression stroke,
According to two-stroke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under two-stroke mode state
Continuous service realizes the switching from four-stoke mode to two-stroke mode；
When judge current working be running on the lower load, and current stroke mode be two-stroke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under two-stroke mode to be terminated, and at the end of previous cycle compression stroke,
According to four-stoke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under four-stoke mode state
Continuous service realizes the switching from two-stroke mode to four-stoke mode；
The control process of the two-stroke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Piston downlink process
In, electronic control unit successively opens exhaust valve, inlet valve starts exhaust and air inlet；Piston downlink reaches after bottom dead center in crankshaft-link rod
Act on lower uplink；During piston stroking upward, electronic control unit successively closes exhaust valve, inlet valve completes exhaust and air inlet, exhaust valve,
When inlet valve is all closed, controlling fuel injection by electric control unit device oil spout is mixed with fresh air；Piston stroking upward is completed when reaching top dead centre
Compression stroke；
The control process of the four-stoke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Under piston downlink reaches
After stop under the action of crankshaft uplink；During piston stroking upward, electronic control unit opens exhaust valve and starts to be vented；Piston stroking upward arrives
When up to top dead centre, electronic control unit closes exhaust valve and completes exhaust stroke；After piston stroking upward arrival top dead centre under the action of crankshaft
Downlink；During piston downlink, electronic control unit opens inlet valve；When piston downlink reaches lower dead center, electronic control unit closes air inlet
Door completes induction stroke；Piston downlink reaches the uplink under crankshaft effect after bottom dead center；During piston stroking upward, electronic control unit control
Fuel injector oil spout processed is mixed with fresh air；Piston stroking upward completes compression stroke when reaching top dead centre.
Preferably, the multiple sensor includes：Crank angle sensor, air inlet pressure sensor, air-temperature sensing
Device and valve displacement sensor.
Preferably, the electronic control unit carries out Grazing condition control, the valve of intake and exhaust valves to inlet valve, exhaust valve
Lift, valve timing angle and valve motion rule are independent continuously adjustable.
Preferably, the fuel of the engine is liquid fuel or gaseous fuel.
Preferably, the liquid fuel is gasoline or diesel oil；The gaseous fuel is natural gas or hydrogen.
The advantages of the present invention are：A kind of two or four stroke of engine using the full changeable air valve of electromagnetism is provided
Switching method can switch stroke mode according to actual condition.
Inlet valve, the exhaust valve of inventive engine all use the full changeable air valve of electromagnetism, can be right respectively by electronic control unit
Inlet valve, exhaust valve carry out Grazing condition control, it can be achieved that the full softening of air distribution system accurately controls, and realize the liter of engine valve
The independence of journey, valve timing angle and valve motion rule is continuously adjustable, guarantees reasonable valve timing, and cooperate to oil spout
The real-time control of igniting, it can be ensured that accurately switch between two or four strokes, can adapt to the work under engine different load,
Engine does not need to be driven by means of other hydraulic machineries in the switching of two or four strokes yet, and structure is simple, utilization rate is high.
The full changeable air valve of inventive engine application electromagnetism is cut according to the work requirements under different load in two or four strokes
It does not need to drive by hydraulic machinery in changing, structure is simple, utilization rate is high.
The present invention can be achieved according to the duty requirements real-time perfoming two-stroke mode of engine and the switching of four-stoke mode；
In low- load conditions, engine is run under four-stoke mode, to realize optimal fuel economy；Under high load capacity operating condition,
Engine is switched under two-stroke mode and works, to improve the dynamic property of engine.
The present invention is in four air inlet, compression, acting, exhaust driving strokes when selection compression stroke completion, i.e., piston arrives
The switching of two or four strokes is carried out up to this node of top dead centre, reason is that inlet and exhaust valve herein is turned off, without considering at this
The delay or degree of advance problem that near top dead center influences inlet and exhaust valve closing, opens because stroke changes, previous stroke mould
After formula completion oil spout after compressing inflammable gas, can steadily it switch with the igniting expansion work of the latter stroke mode.
The present invention can realize that two-stroke cycle, the present invention have no need to change the gas of four-stroke engine on four stroke platforms
Cylinder structure, it is only necessary to which reasonable port timing timing, the longer valve of dependence fold open procedure to complete sufficiently changing in the short period
Gas, and the air inlet environment with appropriate degree pressurization are swept using the piston of the fresh working medium cooperation uplink of the high pressure of air inlet
Residual gas in cylinder is forced to be discharged by gas process from exhaust valve, after exhaust valve closing, one section of piston compressing inflammable mixture gas
Stroke, then igniting starts next circulation.
The present invention can be by the scavenging scavenging way of the air intake-exhaust distribution mode of four-stroke engine and two stroke engine
Combine, enable different intake and exhaust closure and open the work that combinations complete each stroke, ensure engine economic performance,
The advantages of two kinds of operating modes are given full play on the basis of power performance and emission performance, the torque for making engine and power are more
There can be preferable performance in big engine speed range, alleviate the lance between engine economic performance and power performance
Shield.
The present invention can use Miller cycle under four-stoke mode, control inlet valve late release by electronic control unit, make
It obtains compression travel to shorten, increases expansion work, can effectively inhibit combustion knock, improve engine thermal efficiency.
The present invention can according to different duty requirements, carry out two or four strokes steadily switch, obtain better fuel economy and
Dynamic property, and it is able to satisfy the work of different fuel.The fuel of inventive engine can be the liquid fuels such as gasoline, diesel oil,
It can also be the gaseous fuels such as natural gas, hydrogen.
Specific embodiment
With reference to embodiment, the specific embodiment of the present invention is further described.Following embodiment is only used for more
Add and clearly demonstrate technical solution of the present invention, and not intended to limit the protection scope of the present invention.
The technical solution that the present invention embodies is：
The present invention provides a kind of two or four stroke switching method of engine using the full changeable air valve of electromagnetism, and the engine is four punchings
Journey engine, inlet valve, the exhaust valve of engine all use the full changeable air valve of electromagnetism；
Engine electric-controlled unit works according to current stroke scheme control inlet valve, exhaust valve, spark plug and fuel injector, makes to start
Machine continuous service under current stroke mode state；The current stroke mode is four-stoke mode or two-stroke mode；
And electronic control unit judges current working according to the signal that multiple sensors upload,
When judge current working be high load capacity operating condition, and current stroke mode be four-stoke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under four-stoke mode to be terminated, and at the end of previous cycle compression stroke,
According to two-stroke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under two-stroke mode state
Continuous service realizes the switching from four-stoke mode to two-stroke mode；
When judge current working be running on the lower load, and current stroke mode be two-stroke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under two-stroke mode to be terminated, and at the end of previous cycle compression stroke,
According to four-stoke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under four-stoke mode state
Continuous service realizes the switching from two-stroke mode to four-stoke mode；
The control process of the two-stroke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Piston downlink process
In, electronic control unit successively opens exhaust valve, inlet valve starts exhaust and air inlet；Piston downlink reaches after bottom dead center in crankshaft-link rod
Act on lower uplink；During piston stroking upward, electronic control unit successively closes exhaust valve, inlet valve completes exhaust and air inlet, exhaust valve,
When inlet valve is all closed, controlling fuel injection by electric control unit device oil spout is mixed with fresh air；Piston stroking upward is completed when reaching top dead centre
Compression stroke；
The control process of the four-stoke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Under piston downlink reaches
After stop under the action of crankshaft uplink；During piston stroking upward, electronic control unit opens exhaust valve and starts to be vented；Piston stroking upward arrives
When up to top dead centre, electronic control unit closes exhaust valve and completes exhaust stroke；After piston stroking upward arrival top dead centre under the action of crankshaft
Downlink；During piston downlink, electronic control unit opens inlet valve；When piston downlink reaches lower dead center, electronic control unit closes air inlet
Door completes induction stroke；Piston downlink reaches the uplink under crankshaft effect after bottom dead center；During piston stroking upward, electronic control unit control
Fuel injector oil spout processed is mixed with fresh air；Piston stroking upward completes compression stroke when reaching top dead centre.
The multiple sensor includes：Crank angle sensor, air inlet pressure sensor, intake air temperature sensor and valve
Displacement sensor.
The electronic control unit carries out Grazing condition control, the valve stroke of intake and exhaust valves, gas to inlet valve, exhaust valve
Door opening and closing angle and valve motion rule are independent continuously adjustable.
The fuel of the engine is liquid fuel or gaseous fuel.
Preferably, the liquid fuel is gasoline or diesel oil；The gaseous fuel is natural gas or hydrogen.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (5)
1. two or the four stroke switching method of engine of the application full changeable air valve of electromagnetism, which is characterized in that the engine is four punchings
Journey engine, inlet valve, the exhaust valve of engine all use the full changeable air valve of electromagnetism；
Engine electric-controlled unit works according to current stroke scheme control inlet valve, exhaust valve, spark plug and fuel injector, makes to start
Machine continuous service under current stroke mode state；The current stroke mode is four-stoke mode or two-stroke mode；
And electronic control unit judges current working according to the signal that multiple sensors upload,
When judge current working be high load capacity operating condition, and current stroke mode be four-stoke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under four-stoke mode to be terminated, and at the end of previous cycle compression stroke,
According to two-stroke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under two-stroke mode state
Continuous service realizes the switching from four-stoke mode to two-stroke mode；
When judge current working be running on the lower load, and current stroke mode be two-stroke mode when, electronic control unit control hair
Motivation proceeds to previous cycle compression stroke under two-stroke mode to be terminated, and at the end of previous cycle compression stroke,
According to four-stoke mode control inlet valve, exhaust valve, spark plug and fuel injector work, make engine under four-stoke mode state
Continuous service realizes the switching from two-stroke mode to four-stoke mode；
The control process of the two-stroke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Piston downlink process
In, electronic control unit successively opens exhaust valve, inlet valve starts exhaust and air inlet；Piston downlink reaches after bottom dead center in crankshaft-link rod
Act on lower uplink；During piston stroking upward, electronic control unit successively closes exhaust valve, inlet valve completes exhaust and air inlet, exhaust valve,
When inlet valve is all closed, controlling fuel injection by electric control unit device oil spout is mixed with fresh air；Piston stroking upward is completed when reaching top dead centre
Compression stroke；
The control process of the four-stoke mode is as follows：Electronic control unit controls plug ignition, and mixed working fluid burning, makes cylinder in cylinder
Interior pressure increases rapidly, and piston is pushed to move from top dead centre toward lower dead center direction, carries out expansion stroke；Under piston downlink reaches
After stop under the action of crankshaft uplink；During piston stroking upward, electronic control unit opens exhaust valve and starts to be vented；Piston stroking upward arrives
When up to top dead centre, electronic control unit closes exhaust valve and completes exhaust stroke；After piston stroking upward arrival top dead centre under the action of crankshaft
Downlink；During piston downlink, electronic control unit opens inlet valve；When piston downlink reaches lower dead center, electronic control unit closes air inlet
Door completes induction stroke；Piston downlink reaches the uplink under crankshaft effect after bottom dead center；During piston stroking upward, electronic control unit control
Fuel injector oil spout processed is mixed with fresh air；Piston stroking upward completes compression stroke when reaching top dead centre.
2. engine two or the four stroke switching method according to claim 1 using the full changeable air valve of electromagnetism, feature exist
In the multiple sensor includes：Crank angle sensor, air inlet pressure sensor, intake air temperature sensor and valve displacement
Sensor.
3. engine two or the four stroke switching method according to claim 1 using the full changeable air valve of electromagnetism, feature exist
In the electronic control unit carries out Grazing condition control, the valve stroke of intake and exhaust valves, valve opening to inlet valve, exhaust valve
It closes angle and valve motion rule is independent continuously adjustable.
4. engine two or the four stroke switching method according to claim 1 using the full changeable air valve of electromagnetism, feature exist
In the fuel of the engine is liquid fuel or gaseous fuel.
5. engine two or the four stroke switching method according to claim 4 using the full changeable air valve of electromagnetism, feature exist
In the liquid fuel is gasoline or diesel oil；The gaseous fuel is natural gas or hydrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810598225.XA CN108868943A (en) | 2018-06-12 | 2018-06-12 | Using two or the four stroke switching method of engine of the full changeable air valve of electromagnetism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810598225.XA CN108868943A (en) | 2018-06-12 | 2018-06-12 | Using two or the four stroke switching method of engine of the full changeable air valve of electromagnetism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108868943A true CN108868943A (en) | 2018-11-23 |
Family
ID=64337880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810598225.XA Withdrawn CN108868943A (en) | 2018-06-12 | 2018-06-12 | Using two or the four stroke switching method of engine of the full changeable air valve of electromagnetism |
Country Status (1)
| Country | Link |
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| CN (1) | CN108868943A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944549A (en) * | 2020-07-15 | 2022-01-18 | 深圳臻宇新能源动力科技有限公司 | Control method and control system for valve timing of engine |
| CN114135402A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Two-four stroke variable engine valve mechanism |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10053336C1 (en) * | 2000-10-27 | 2002-07-11 | Bosch Gmbh Robert | IC engine operating method allows torque-dependent switching between 4-stroke operating mode and 2-stroke operating mode |
| CN1944993A (en) * | 2005-10-09 | 2007-04-11 | 邸立明 | Engine with variable stroke and variable compression ratio |
| US20090277434A1 (en) * | 2008-05-08 | 2009-11-12 | Ford Global Technologies, Llc | Control strategy for multi-stroke engine system |
| CN103225539A (en) * | 2013-04-02 | 2013-07-31 | 清华大学 | Variable stroke engine |
-
2018
- 2018-06-12 CN CN201810598225.XA patent/CN108868943A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10053336C1 (en) * | 2000-10-27 | 2002-07-11 | Bosch Gmbh Robert | IC engine operating method allows torque-dependent switching between 4-stroke operating mode and 2-stroke operating mode |
| CN1944993A (en) * | 2005-10-09 | 2007-04-11 | 邸立明 | Engine with variable stroke and variable compression ratio |
| US20090277434A1 (en) * | 2008-05-08 | 2009-11-12 | Ford Global Technologies, Llc | Control strategy for multi-stroke engine system |
| CN103225539A (en) * | 2013-04-02 | 2013-07-31 | 清华大学 | Variable stroke engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944549A (en) * | 2020-07-15 | 2022-01-18 | 深圳臻宇新能源动力科技有限公司 | Control method and control system for valve timing of engine |
| CN114135402A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Two-four stroke variable engine valve mechanism |
| CN114135402B (en) * | 2021-11-26 | 2023-08-11 | 中国北方发动机研究所(天津) | Two-four stroke variable engine valve mechanism |
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Application publication date: 20181123 |
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