CN105863841A - Method for conducting angle encoding on instantaneous pressure in engine cylinder - Google Patents
Method for conducting angle encoding on instantaneous pressure in engine cylinder Download PDFInfo
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- CN105863841A CN105863841A CN201610345282.8A CN201610345282A CN105863841A CN 105863841 A CN105863841 A CN 105863841A CN 201610345282 A CN201610345282 A CN 201610345282A CN 105863841 A CN105863841 A CN 105863841A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000007906 compression Methods 0.000 claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000009795 derivation Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000036962 time dependent Effects 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 2
- 239000003550 marker Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
-
- 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
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/087—Safety, indicating, or supervising devices determining top dead centre or ignition-timing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for conducting angle encoding on instantaneous pressure in an engine cylinder. The method includes the steps that a crank angle corresponding to the maximum value of the pressure rise rate in the compression stroke is calculated; the time sampling frequency of the instantaneous pressure in the cylinder is determined; the change rule of the instantaneous pressure in the cylinder along with time is recorded, the maximum value of the pressure rise rate in the compression process is found out in a curve where the pressure rise rate is changed along with time, and a time sampling point where the point of the maximum value is located corresponds to the crank angle which is previously calculated; and the crank angle serves as the base point, a formulated crank angle interval is combined, angle coding is conducted on the instantaneous pressure in the whole cylinder, and finally the change rule of the instantaneous pressure in the cylinder along with time is obtained. By means of the method, a corner mark generator does not need to be installed, a combustion process measuring system is simplified, measuring and angle encoding of the instantaneous pressure in the cylinder can be achieved simply through a cylinder pressure sensor, the installing difficulty of the combustion process measuring system is lowered, the probability that faults may happen in the combustion process measuring process is lowered, and the system cost is saved.
Description
Technical field
The present invention relates to stroke piston combustion engine in-cylinder combustion fields of measurement, particularly relate to one and be independent of
The method that crankangle marker carries out corner coding to instantaneous pressure in engine cylinder.
Background technology
Stroke piston combustion engine performance and the quality of emission performance, with fuel combustion process in cylinder
Having direct relation, therefore, in-cylinder combustion process analysis becomes analyzes stroke piston combustion engine performance
Important means.In-cylinder combustion procedure parameter mainly includes instantaneous pressure in cylinder, the rate of pressure rise, instantaneous puts
Heating rate, transient temperature etc., wherein in cylinder instantaneous pressure use directly measure acquisition, other parameters be all
Obtained by Theoretical Calculation on the basis of instantaneous pressure in cylinder.As can be seen here, instantaneous pressure accurate in cylinder
Measurement is the key of in-cylinder combustion process analysis.
In cylinder, instantaneous pressure includes the size of force value and the crank angle of correspondence, and force value uses installs
Cylinder pressure sensor in cylinder head is measured, and crank angle corresponding to force value is given by crankangle marker.
In order to ensure stability and the precision that cylinder pressure value measures, usually require that crankangle marker is arranged on bent axle one
On the end face of end and it is necessary to ensureing there is the highest axiality with bent axle, crankangle marker must also simultaneously
Keeping vibrating together with electromotor, this proposes high requirement to the installation of crankangle marker.It addition,
Crankangle marker and mounting bracket thereof are subjected to violent vibration in the course of the work, easily occur to install to prop up
Frame and the damage of crankangle marker body.Therefore, it is highly desirable to provide a kind of occur not against footmark
Device determines the method for cylinder pressure value correspondence crank angle, i.e. instantaneous pressure in engine cylinder is carried out corner volume
The method of code.
Summary of the invention
The present invention provides a kind of method that instantaneous pressure in engine cylinder is carried out corner coding, it is not necessary to peace
Dress crankangle marker, only relies on cylinder pressure sensor and can be achieved with compiling measurement and the corner of instantaneous pressure in cylinder
Code.
In order to achieve the above object, the present invention provides one that instantaneous pressure in engine cylinder is carried out corner volume
The method of code, comprises the steps of
Step S1, to calculate rate of pressure rise maximum in compression stroke according to engine structure parameter corresponding
Crank angle ψ0；
Step S2, determine time sampling frequency f of instantaneous pressure in cylinder；
Step S3, according to time sampling frequency f record cylinder in instantaneous pressure rule over time,
The rate of pressure rise is calculated on the basis of the pressure data obtained；
Step S4, from the time dependent curve of the rate of pressure rise, find out in compression process pressure and raise
The maximum of rate, the most corresponding crank angle ψ of the time sampling point at this maximum of points place0；
Step S5, with crank angle ψ0Based on, crankshaft angle interval j drafted in integrating step S2,
Instantaneous pressure in whole cylinder is carried out corner coding, and in final acquisition cylinder, instantaneous pressure is with the change of crank angle
Law.
Described step S1 specifically comprises the steps of
Stroke piston combustion engine compression process is approximately systems insulation process of remaining silent, by proximal air in cylinder
Seemingly for ideal gas, then formula (1) is had to set up:
Wherein, P is instantaneous pressure in cylinder, and V is the instantaneous volume of cylinder, and γ is specific heat ratio, and K is constant,
P and V is the function of crank angle ψ；
On the both sides of formula (1), crank angle ψ derivation can be obtained:
OrderThen formula (2) can be write as:
In compression process, calculate the maximum of the rate of pressure rise, be the maximum of the formula of asking for (3), then
Make R '=0；
I.e.
Obtain equation
In equation (5)
Wherein, D is engine bore, and S is piston stroke, and ε is engine compression ratio,For song
The ratio of handle radius r and length of connecting rod L；
Formula (6), (7) are brought into equation (5) and can obtain an equation about ψ, direct solution or
Person solves the equation indirectly can obtain the crank angle that in compression process, rate of pressure rise maximum is corresponding
ψ0。
In described step S1, the indirect solution to equation (5) is as follows:
Order
Bring formula (6), (7) into equation (8), then T is the function of ψ, it can be deduced that T turns with bent axle
The change curve of angle ψ, this curve and straight line y=0 are the solution of equation (5) at the intersection point of compression process.
In described step S2, in cylinder, time sampling frequency f of instantaneous pressure can be calculated by formula (9):
Wherein, n is the postrun rotating speed of engine stabilizer, and j is instantaneous pressure correspondence in desired cylinder
Crankshaft angle interval.
The employing single order centered Finite Difference Methods calculating rate of pressure rise in described step S3:
Wherein, i represents i-th time sampling point.
This invention simplifies combustion process and measure system, only rely on cylinder pressure sensor and can be achieved with wink in cylinder
Time the measurement of pressure and corner coding, reduce combustion process and measure the installation difficulty of system, decrease combustion
It is likely to occur the probability of fault during burning process measurement, saves system cost.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 is that instantaneous pressure and the rate of pressure rise change schematic diagram with crank angle in typical cylinder.
Fig. 3 is that T value is with crank angle change curve.
Fig. 4 is that instantaneous pressure changes over curve chart in cylinder.
Fig. 5 is to change over, according to instantaneous pressure in cylinder, the rate of pressure rise curve chart that rule calculates.
Fig. 6 be use crankangle marker and do not use crankangle marker to obtain respectively cylinder in instantaneous pressure song
Line comparison diagram.
Detailed description of the invention
Below according to Fig. 1～Fig. 6, illustrate presently preferred embodiments of the present invention.
As it is shown in figure 1, the present invention provides a kind of side that instantaneous pressure in engine cylinder carries out corner coding
Method, comprises the steps of
Step S1, to calculate rate of pressure rise maximum in compression stroke according to engine structure parameter corresponding
Crank angle ψ0；
As in figure 2 it is shown, stroke piston combustion engine is when compression stroke, along with piston stroking upward, wink in cylinder
Although time pressure gradually rise, but there is maximum P ' max in the rate of pressure rise, and this maximum point is corresponding
Crank angle ψ0Can calculate according to engine structure parameter, Computing Principle is as follows:
Stroke piston combustion engine compression process is approximately systems insulation process of remaining silent, by proximal air in cylinder
Seemingly for ideal gas, then formula (1) is had to set up:
Wherein, P is instantaneous pressure in cylinder, and V is the instantaneous volume of cylinder, and γ is specific heat ratio, and K is constant,
P and V is the function of crank angle ψ；
On the both sides of formula (1), crank angle ψ derivation can be obtained:
OrderThen formula (2) can be write as:
In compression process, calculate the maximum of the rate of pressure rise, be the maximum of the formula of asking for (3), then
Make R '=0；
I.e.
Obtain equation
In equation (5)
Wherein, D is engine bore, and S is piston stroke, and ε is engine compression ratio,For song
The ratio of handle radius r and length of connecting rod L；
Formula (6), (7) are brought into equation (5) can obtain one about the equation of ψ, solve the equation
The crank angle ψ 0 that rate of pressure rise maximum in compression process is corresponding can be obtained；
Equation (5) is solved, in addition to direct solution, it is also possible to use indirect solution, indirect solution
As follows:
Order
Bring formula (6), (7) into equation (8), then T is the function of ψ, it can be deduced that T turns with bent axle
The change curve of angle ψ, as it is shown on figure 3, this curve and straight line y=0 are in the intersection point side of being of compression process
The solution of journey (5)；The present invention preferably employs indirect solution when solving equation (5)；
Step S2, determine time sampling frequency f of instantaneous pressure in cylinder；
Instantaneous pressure Test Cycle in cylinder, records engine speed n after electromotor stable operation, false
If the crankshaft angle interval that in desired cylinder, instantaneous pressure is corresponding is j, then in cylinder instantaneous pressure time
Between sample frequency f can be calculated by formula (9):
Step S3, according to time sampling frequency f record cylinder in instantaneous pressure rule over time,
The calculating rate of pressure rise on the basis of the pressure data obtained:
As shown in formula (10), the preferably employing single order centered Finite Difference Methods calculating rate of pressure rise:
Wherein, i represents i-th time sampling point.
Step S4, from the time dependent curve of the rate of pressure rise, find out in compression process pressure and raise
The maximum of rate, the most corresponding crank angle ψ of the time sampling point at this maximum of points place0；
Step S5, with crank angle ψ0Based on, crankshaft angle interval j drafted in integrating step S2,
Instantaneous pressure in whole cylinder is carried out corner coding, and in final acquisition cylinder, instantaneous pressure is with the change of crank angle
Law.
By the following examples embodiments of the present invention are described in detail.
Embodiment 1
The cylinder diameter of certain type conventional engine known is 126mm, and throw of crankshaft is 65mm, connecting rod
A length of 219mm, engine compression ratio is 17.According to above parameter, convolution (6), (7), (8)
The curve chart that T value changes can be obtained with crank angle, as it is shown on figure 3, can be in the hope of pressure in compression process
The crank angle that rate of rise maximum is corresponding
The rotating speed that engine cylinder combustion process is measured elects 1500r/min as, it is desirable to instantaneous pressure in the cylinder of acquisition
Crankshaft angle interval corresponding to power is 0.1 ° of CA, according to formula (9) can be calculated instantaneous pressure in cylinder time
Between sample frequency be 90kHz.Under this frequency, in the cylinder of record, instantaneous pressure changes over curve such as figure
Shown in 4, the rate of pressure rise curve calculated on the basis of instantaneous pressure in cylinder is as it is shown in figure 5, permissible
Obtaining in compression process, the sampling time point that rate of pressure rise maximum is corresponding is 3468, i.e. puts 3468
Corresponding-13.9 ° of CA of crank angle.With-13.9 ° of CA as basic point, it is spaced 0.1 ° of CA according to each sampled point
Setting i.e. can get the crank angle coding of instantaneous pressure curve in whole piece cylinder, as shown in Figure 6.Fig. 6
Also will use instantaneous pressure in the cylinder that the inventive method obtains, and be installed wink in the cylinder that obtains of crankangle marker
Time pressure contrasted, both essentially coincide, and corresponding crank angle differs only by 0.7 ° of CA, it is seen that this
The method that invention provides can not only realize not installing the purpose of crankangle marker, and has enough precision.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should understanding
It is not considered as limitation of the present invention to the description above.Read above-mentioned those skilled in the art
After content, multiple amendment and replacement for the present invention all will be apparent from.Therefore, the present invention
Protection domain should be limited to the appended claims.
Claims (5)
1. the method that instantaneous pressure in engine cylinder is carried out corner coding, it is characterised in that comprise following
Step:
Step S1, calculate rate of pressure rise maximum pair in compression stroke according to engine structure parameter
The crank angle ψ answered0；
Step S2, determine time sampling frequency f of instantaneous pressure in cylinder；
Step S3, according to time sampling frequency f record cylinder in instantaneous pressure rule over time,
The rate of pressure rise is calculated on the basis of the pressure data obtained；
Step S4, from the time dependent curve of the rate of pressure rise, find out pressure in compression process
The maximum of rate of rise, the most corresponding crank angle ψ of the time sampling point at this maximum of points place0；
Step S5, with crank angle ψ0For basic point, between the crank angle drafted in integrating step S2
Every j, instantaneous pressure in whole cylinder being carried out corner coding, in final acquisition cylinder, instantaneous pressure is with bent axle
The Changing Pattern of corner.
2. the method as claimed in claim 1 instantaneous pressure in engine cylinder being carried out corner coding, its feature
It is, described step S1 specifically comprises the steps of
Stroke piston combustion engine compression process is approximately systems insulation process of remaining silent, by air in cylinder
It is approximately ideal gas, then has formula (1) to set up:
Wherein, P is instantaneous pressure in cylinder, and V is the instantaneous volume of cylinder, and γ is specific heat ratio, and K is
Constant, P and V is the function of crank angle ψ；
On the both sides of formula (1), crank angle ψ derivation can be obtained:
OrderThen formula (2) can be write as:
In compression process, calculate the maximum of the rate of pressure rise, be the maximum of the formula of asking for (3),
Then make R '=0；
I.e.
Obtain equation
In equation (5)
Wherein, D is engine bore, and S is piston stroke, and ε is engine compression ratio,For
Throw of crankshaft r and the ratio of length of connecting rod L；
Formula (6), (7) are brought into equation (5) and can be obtained an equation about ψ, direct solution
Or indirectly solve the equation and can obtain the bent axle that in compression process, rate of pressure rise maximum is corresponding
Corner ψ0。
3. the method as claimed in claim 2 instantaneous pressure in engine cylinder being carried out corner coding, its feature
Being, in described step S1, the indirect solution to equation (5) is as follows:
Order
Bring formula (6), (7) into equation (8), then T is the function of ψ, it can be deduced that T is with song
The change curve of Shaft angle ψ, this curve and straight line y=0 are equation (5) at the intersection point of compression process
Solution.
4. the method as claimed in claim 1 instantaneous pressure in engine cylinder being carried out corner coding, its feature
Being, in described step S2, in cylinder, time sampling frequency f of instantaneous pressure can be counted by formula (9)
Calculate:
Wherein, n is the postrun rotating speed of engine stabilizer, and j is instantaneous pressure in desired cylinder
Corresponding crankshaft angle interval.
5. the method as claimed in claim 1 instantaneous pressure in engine cylinder being carried out corner coding, its feature
It is, the employing single order centered Finite Difference Methods calculating rate of pressure rise in described step S3:
Wherein, i represents i-th time sampling point.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345282.8A CN105863841B (en) | 2016-05-23 | 2016-05-23 | A kind of method that corner coding is carried out to instantaneous pressure in engine cylinder |
| PCT/CN2017/085279 WO2017202263A1 (en) | 2016-05-23 | 2017-05-22 | Method for performing angle encoding on instantaneous pressure in cylinder of engine |
| CH00412/18A CH713185B1 (en) | 2016-05-23 | 2017-05-22 | Method for wave coding the transient internal cylinder pressure of engines. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345282.8A CN105863841B (en) | 2016-05-23 | 2016-05-23 | A kind of method that corner coding is carried out to instantaneous pressure in engine cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN105863841A true CN105863841A (en) | 2016-08-17 |
| CN105863841B CN105863841B (en) | 2018-05-08 |
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| CN201610345282.8A Active CN105863841B (en) | 2016-05-23 | 2016-05-23 | A kind of method that corner coding is carried out to instantaneous pressure in engine cylinder |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN105863841B (en) |
| CH (1) | CH713185B1 (en) |
| WO (1) | WO2017202263A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202263A1 (en) * | 2016-05-23 | 2017-11-30 | 上海海事大学 | Method for performing angle encoding on instantaneous pressure in cylinder of engine |
| CN110466501A (en) * | 2019-09-11 | 2019-11-19 | 吉林大学 | Hybrid electric vehicle engine start-up and shut-down control method |
| CN113431680A (en) * | 2021-05-20 | 2021-09-24 | 北京化工大学 | Full-period acquisition and instantaneous speed calculation method of engine monitoring signals based on tooth pulse of tooth-lacking fluted disc |
| CN113432881A (en) * | 2021-07-15 | 2021-09-24 | 哈尔滨工程大学 | Method for simulating compression pressure and temperature in two-stroke cylinder by using four-stroke single cylinder |
| CN114510825A (en) * | 2022-01-13 | 2022-05-17 | 北京理工大学 | Optimal phase difference obtaining method and system for opposed-piston efficient engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116680507B (en) * | 2023-05-10 | 2024-04-19 | 湖北航天化学技术研究所 | Method, system and device for automatically determining combustion time of solid rocket engine |
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- 2017-05-22 CH CH00412/18A patent/CH713185B1/en unknown
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| JPH07133742A (en) * | 1993-11-08 | 1995-05-23 | Nissan Motor Co Ltd | Measuring device and control device for internal combustion engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202263A1 (en) * | 2016-05-23 | 2017-11-30 | 上海海事大学 | Method for performing angle encoding on instantaneous pressure in cylinder of engine |
| CN110466501A (en) * | 2019-09-11 | 2019-11-19 | 吉林大学 | Hybrid electric vehicle engine start-up and shut-down control method |
| CN113431680A (en) * | 2021-05-20 | 2021-09-24 | 北京化工大学 | Full-period acquisition and instantaneous speed calculation method of engine monitoring signals based on tooth pulse of tooth-lacking fluted disc |
| CN113431680B (en) * | 2021-05-20 | 2022-05-13 | 北京化工大学 | Full-period acquisition and instantaneous speed calculation method of engine monitoring signals based on tooth pulse of tooth-lacking fluted disc |
| CN113432881A (en) * | 2021-07-15 | 2021-09-24 | 哈尔滨工程大学 | Method for simulating compression pressure and temperature in two-stroke cylinder by using four-stroke single cylinder |
| CN114510825A (en) * | 2022-01-13 | 2022-05-17 | 北京理工大学 | Optimal phase difference obtaining method and system for opposed-piston efficient engine |
| CN114510825B (en) * | 2022-01-13 | 2023-02-10 | 北京理工大学 | Method and system for obtaining optimal phase difference of opposed piston engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CH713185B1 (en) | 2019-08-15 |
| WO2017202263A1 (en) | 2017-11-30 |
| CN105863841B (en) | 2018-05-08 |
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