CN106762319B - Four stroke aviation piston engine cold start strategies - Google Patents
Four stroke aviation piston engine cold start strategies Download PDFInfo
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- CN106762319B CN106762319B CN201611248908.XA CN201611248908A CN106762319B CN 106762319 B CN106762319 B CN 106762319B CN 201611248908 A CN201611248908 A CN 201611248908A CN 106762319 B CN106762319 B CN 106762319B
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- 239000007858 starting material Substances 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims description 9
- 230000008450 motivation Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 208000006011 Stroke Diseases 0.000 description 12
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of four stroke aviation piston engine cold start strategies, including：It maintains the inlet valve of cylinder in the open state, drives the engine to accelerate to preset rotation speed from zero by starter, so that the rotary part of the engine stores kinetic energy；Periodically open and close the valve of the cylinder, the torque provided using the kinetic energy and starting motor of storage drives engine to be rotated further, until the engine speed reaches fire speed, the wall temperature of the cylinder reaches default temperature cylinder and the gas in the jar temperature reaches default gas in the jar temperature；Wherein, the preset rotation speed is less than the fire speed.The invention has the advantages that：Engine warm-up easy to implement is suitable for starting under cold environment.
Description
Technical field
The present invention relates to technical field of aerospace, and in particular to a kind of four stroke aviation piston engine cold start strategies.
Background technology
It is answered extensively in aviation field since aviation piston engine has the characteristics that efficient, fuel economy is good
With on unmanned plane and various all purpose aircrafts.
Existing aviation piston engine start-up strategy is similar with automobile engine, be using starter drive engine from
Stationary state starts to rotate, and ignition start or compression ignition start are carried out by atomizer oil spout after engine to fire speed, until
Engine can voluntarily be stablized in idling mode, and starting process terminates.There are some intrinsic drawbacks in this start-up strategy：Start
Machine is rotated since static, this causes starter starting immediate current very big, required after getting up far more than engine rotation
Starter electric current.This is because mechanical engine members are various, starting moment needs to overcome stiction and cylinder pressure
Resistance after superposition, and stiction is much larger than kinetic force of friction, therefore starter starts immediate current super large, this intrinsic phenomenon
That motor control algorithms cann't be solved, this just to the hardware facility of starting system, as inverter, accumulator, radiator,
Protective device etc. proposes harsher requirement, causes entire engine starting system weight to increase, reliability decrease, or even by
In high latitude area, winter temperature is relatively low, and accumulator property declines, it may appear that the phenomenon that engine start fails or can not start.
Invention content
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, it is an object of the invention to propose a kind of four stroke aviation piston engine cold start strategies, the starting plan
It is slightly only applicable to valve opening and closing and the full decoupled engine of piston position, for example is mounted with starting for no camshaft electric air valve
Machine.
To achieve the goals above, embodiment of the invention discloses that a kind of four stroke aviation piston engine cold start sides
Method, including：It maintains the inlet valve of cylinder in the open state, drives the engine to accelerate to from zero by starter pre-
If rotating speed, so that the rotary part of the engine stores kinetic energy；Periodically open and close the gas of the cylinder
Door, the torque provided using the kinetic energy and starting motor of storage drives engine to be rotated further, until the engine turns
Speed reaches fire speed, the wall temperature of the cylinder reaches default temperature cylinder and the gas in the jar temperature reaches default
Gas in the jar temperature；Wherein, the preset rotation speed is less than the fire speed.
Four strokes aviation piston engine cold start strategy according to the ... of the embodiment of the present invention drives engine to add in starter
Speed to preset rotation speed stage so that the rotary parts such as inertial flywheel, bent axle of engine store certain kinetic energy, and due to beating
It starts the engine the inlet valve of cylinder, frictional force and cylinder pressure can realize decoupling, and the starting current of starter can be with
Substantially reduce；Periodically open and close the valve of cylinder so that engine can relatively smooth reach igniting
Rotating speed can also realize good warming-up.
In addition, four strokes aviation piston engine cold start strategy according to the above embodiment of the present invention, can also have
Following additional technical characteristic：
Further, in step s 2, the exhaust valve of the cylinder remains turned-off, and periodically opens and closes
The inlet valve of the cylinder.
Further, in step s 2, by controlling the duty ratio of the engine air cylinder intake valve, to realize step S1
At the end of seamlessly transitting between engine condition when finally lighting a fire in engine condition to step S2.
Further, a cycle of the inlet valve of the cylinder includes sequence setting：Period 1 unit,
The period 1 unit is the valve-closing response time；Second round unit, the second round unit are that valve is in pass
The time of closed state；Period 3 unit, the period 3 unit are the valve opening response time；Period 4 unit, institute
It is the time that valve is in open state to state period 4 unit.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the flow chart of four stroke aviation piston engine cold start strategies of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the cylinder compression stroke of one embodiment of the invention；
Fig. 3 is the schematic diagram that the valve of the cylinder of one embodiment of the invention periodically opens and closes.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
With reference to following description and drawings, it will be clear that these and other aspects of the embodiment of the present invention.In these descriptions
In attached drawing, some particular implementations in the embodiment of the present invention are specifically disclosed, to indicate to implement the implementation of the present invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention
Embodiment includes all changes, modification and the equivalent fallen within the scope of the spirit and intension of attached claims.
The present invention is described below in conjunction with attached drawing.
Fig. 1 is the flow chart of four stroke aviation piston engine cold start strategies of the embodiment of the present invention.As shown in Figure 1,
Four strokes aviation piston engine cold start strategy according to the ... of the embodiment of the present invention is suitable for piston phase and valve open and-shut mode
Full decoupled engine, includes the following steps：
S1：It maintains the inlet valve of cylinder in the open state, drives engine to accelerate to from zero by starter pre-
If rotating speed, so that the rotary part of engine stores kinetic energy.
Fig. 2 is the schematic diagram of the cylinder compression stroke of one embodiment of the invention.As shown in Fig. 2, wherein F is represented
Cylinder pressure, f represent frictional force.In traditional technology, inlet and exhaust valve is needed all in closed state, starter when compression stroke
The moment of resistance after overcoming cylinder pressure and stiction to be superimposed, this causes starting transient starting electromechanics stream very big, this is right
Inverter and accumulator cause burden.And in an embodiment of the present invention, in the first starting stage, (i.e. starter drive is started
Machine accelerates to the preset rotation speed stage from zero, similarly hereinafter) cylinder pressure is no longer superimposed with frictional force, decoupling is realized, in this way
The starting current of starter can substantially reduce so that the rotary parts such as inertial flywheel, bent axle of engine store certain kinetic energy.
S2：The valve for periodically opening and closing cylinder, promotes wall temperature, the gas in the jar temperature of cylinder
Degree and engine speed, until engine speed reaches fire speed, the wall temperature of cylinder reaches default temperature cylinder and
Gas in the jar temperature reaches default gas in the jar temperature.
Specifically, engine rotating components have accumulated certain kinetic energy in the first starting stage, the second starting stage (i.e.
Wall temperature, gas in the jar temperature and the engine speed of cylinder, until engine speed reaches fire speed, engine air
The wall temperature of cylinder reaches default temperature cylinder and gas in the jar temperature reaches the stage of default gas in the jar temperature, similarly hereinafter) it needs to close
Door of holding one's breath carries out compression heating to the air in cylinder, if valve is closed suddenly, can cause engine speed big ups and downs, draw
Play the vibration of the even entire aircraft of engine, it is therefore desirable to slowly closing electric air valve, but electric air valve opening and closing response speed
Quickly, only 2~3ms cannot achieve the slowly closing function of valve to degree, therefore the present invention proposes variable duty cycle valve-closing
Technology, since mechanical constant is much larger than electromagnetic time constant, mechanical system can there are one filter actions to reduce vibration, Ke Yishi
Seamlessly transitting between two set up procedures of existing engine.
In one embodiment of the invention, in step s 2, pass through the duty ratio of the inlet valve of control cylinder
Set the period of the opening and closing of the inlet valve of cylinder.
In one embodiment of the invention, a cycle of the inlet valve of cylinder includes sequence setting：
Period 1 unit, the period 1 unit are the valve-closing response time；
Second round unit, the second round unit are the time that valve is closed；
Period 3 unit, the period 3 unit are the valve opening response time；
Period 4 unit, the period 4 unit are the time that valve is in open state.
Fig. 3 is the schematic diagram that the valve of the cylinder of one embodiment of the invention periodically opens and closes.Such as Fig. 3
Shown, T represents a valve period, t1Represent valve-closing response time, t2Represent the time that valve is closed, t3
Represent valve opening response time, t4Represent the time that valve is in open state, variable duty cycle valve-closing technology, that is, gradual
Increase valve-closing time t2Proportion in entire valve cycle T, until valve completely closes, then engine enters compression
Stroke, air work in compression cylinder so that cylinder inner wall and gas in the jar temperature reach the condition of oil spout igniting or compression ignition, start
Engine enters the normal four strokes stage later, and electric air valve opening and closing is according to conventional engine valve opening and closing rule operation.Its
In, when closing inlet valve using variable duty cycle technology, need to detect piston phase and engine speed, it is pre- by rational algorithm
To estimate piston phase when valve end cycle next time, ensures when finally completely closing of valve, piston is near lower dead center,
There are enough air for oil jetting combustion when engine enters compression stroke in this way, in cylinder.
In one embodiment of the invention, in step s 2, the exhaust valve of cylinder remains turned-off, periodically
Open and close the inlet valve of cylinder.
Specifically, engine ignition start or compression ignition start before, exhaust valve is closed always, therefore several before
In a engine cycle, the air of inspiration cylinder and the air of discharge are all stored in air intake duct, therefore to work(that air is done
And the heat transmitted is as conventional measures by exhaust valve being dissipated in air, therefore relative to conventional measures,
This start-up strategy is easier to realize engine warm-up, and not harsh due to requiring accumulator capacity, thus is suitable for trembling with fear
It is started under cold environment.
Four strokes aviation piston engine cold start strategy according to the ... of the embodiment of the present invention drives engine to add in starter
Speed is to the stage of preset rotation speed, and due to opening the inlet valve of cylinder, frictional force and cylinder pressure can be realized
Decoupling so that the rotary parts such as inertial flywheel, bent axle of engine store certain kinetic energy, and the starting current of starter can be substantially
Reduce；Periodically opening and closing the valve of cylinder so that engine can relatively smooth reach fire speed,
Also good warming-up can be realized.
In addition, when aircraft is in high-altitude flight, once because there is engine failure and can not start hair again in fortuitous event
When motivation, traditional start-up strategy can seem helpless, and start-up strategy proposed by the present invention, and specifically first starts
Aircraft soft landing may be implemented in the strategy in stage, that is, keeps inlet valve and exhaust valve to be in full open position, by starter
Engine rotation is driven, then drives rotor or propeller to continue to rotate by clutch so that aircraft slowly declines realization
Soft landing avoids because the disaster of fatal crass occurs in hard landing.Traditional start-up strategy due to cannot achieve in-cylinder pressure and
The decouplings such as frictional force, load torque cause the moment of resistance very big, thus cannot achieve this function.
In addition, other compositions and the effect pair of four stroke aviation piston engine cold start strategies of the embodiment of the present invention
All it is known for those skilled in the art, in order to reduce redundancy, does not repeat.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is by claim and its equivalent limits.
Claims (2)
1. a kind of four stroke aviation piston engine cold start strategies, which is characterized in that include the following steps：
S1：It maintains the inlet valve of cylinder in the open state, drives engine to accelerate to default turn from zero by starter
Speed, so that the rotary part of the engine stores kinetic energy；
S2：The valve for periodically opening and closing the cylinder, the kinetic energy using storage and the starter
The torque of offer drives the engine to be rotated further, until the engine speed reaches fire speed, the engine air
The wall temperature of cylinder reaches default temperature cylinder and gas in the jar temperature reaches default gas in the jar temperature；Wherein, the preset rotation speed
Less than the fire speed；Wherein, the exhaust valve of the cylinder remains turned-off, and periodically opens and closes the hair
The inlet valve of motivation cylinder, by controlling the duty ratio of the engine air cylinder intake valve, to realize step S1 at the end of start
Seamlessly transitting between engine condition when finally lighting a fire in machine state to step S2.
2. four strokes aviation piston engine cold start strategy according to claim 1, which is characterized in that the engine
The a cycle of the inlet valve of cylinder includes sequence setting：
Period 1 unit, the period 1 unit are the valve-closing response time；
Second round unit, the second round unit are the time that valve is closed；
Period 3 unit, the period 3 unit are the valve opening response time；
Period 4 unit, the period 4 unit are the time that valve is in open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248908.XA CN106762319B (en) | 2016-12-29 | 2016-12-29 | Four stroke aviation piston engine cold start strategies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248908.XA CN106762319B (en) | 2016-12-29 | 2016-12-29 | Four stroke aviation piston engine cold start strategies |
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| Publication Number | Publication Date |
|---|---|
| CN106762319A CN106762319A (en) | 2017-05-31 |
| CN106762319B true CN106762319B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611248908.XA Active CN106762319B (en) | 2016-12-29 | 2016-12-29 | Four stroke aviation piston engine cold start strategies |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6202608B1 (en) * | 1999-03-04 | 2001-03-20 | Honda Giken Kogyo Kabushiki Kaisha | Control system for internal combustion engine |
| JP2007270793A (en) * | 2006-03-31 | 2007-10-18 | Mazda Motor Corp | Engine starter |
| CN102477877A (en) * | 2010-11-24 | 2012-05-30 | 南京理工大学 | Efficient and quick starting method of engine applying solenoid-driven valves |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3828383B2 (en) * | 2001-06-12 | 2006-10-04 | 三菱電機株式会社 | Method and apparatus for controlling electromagnetically driven valve for internal combustion engine |
-
2016
- 2016-12-29 CN CN201611248908.XA patent/CN106762319B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6202608B1 (en) * | 1999-03-04 | 2001-03-20 | Honda Giken Kogyo Kabushiki Kaisha | Control system for internal combustion engine |
| JP2007270793A (en) * | 2006-03-31 | 2007-10-18 | Mazda Motor Corp | Engine starter |
| CN102477877A (en) * | 2010-11-24 | 2012-05-30 | 南京理工大学 | Efficient and quick starting method of engine applying solenoid-driven valves |
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| Publication number | Publication date |
|---|---|
| CN106762319A (en) | 2017-05-31 |
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