WO2011068258A1 - Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé - Google Patents

Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé Download PDF

Info

Publication number
WO2011068258A1
WO2011068258A1 PCT/KR2009/007155 KR2009007155W WO2011068258A1 WO 2011068258 A1 WO2011068258 A1 WO 2011068258A1 KR 2009007155 W KR2009007155 W KR 2009007155W WO 2011068258 A1 WO2011068258 A1 WO 2011068258A1
Authority
WO
WIPO (PCT)
Prior art keywords
curve
time
piston
engine
value
Prior art date
Application number
PCT/KR2009/007155
Other languages
English (en)
Korean (ko)
Inventor
이길용
Original Assignee
주식회사 엔진텍
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 주식회사 엔진텍 filed Critical 주식회사 엔진텍
Priority to PCT/KR2009/007155 priority Critical patent/WO2011068258A1/fr
Publication of WO2011068258A1 publication Critical patent/WO2011068258A1/fr

Links

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
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals

Definitions

  • Prepiston engine control method using predictive curve and prepiston engine controlled by it
  • the present invention relates to a control method of a pre-piston engine, and more particularly, to a control method of a pre-piston engine using a predictive curve for predicting a driving pattern of the pre-piston and a pre-piston engine controlled by the pre-piston engine. It is about.
  • the free-pistion engine is a straight-stroke reciprocating engine, a two-stroke, one-cycle engine, with no crank mechanism.
  • the prepiston engine is connected in a straight line through one shaft (moving shaft), and can be connected to an energy converter such as a hydraulic pump or a generator to generate energy.
  • the prepiston engine has a high piston speed, which allows the mixer to be compressed at a high pressure to realize a high compression ratio. Also, since there is no cramp mechanism, power conversion loss is small and the engine efficiency can be overcome recently. It is attracting much attention.
  • the pre-piston engine is difficult to control due to the variable stroke, and because of the characteristics of the pre-piston engine, the inertia cannot be used, so if the control fails at least once, the engine stops.
  • Johansen et al Proposed a method of controlling the prepiston engine by predicting the movement pattern of the pre-piston by the sine curve (Free Piston Diesel Engine Timing and Control. Control Electronic Cam. ⁇ and Crankshaft, Johansen et al, IEEE Trans. Control
  • the present invention has been made to solve the above problems, the first problem to be solved by the present invention is to provide a control method of the pre-piston engine using a predictive curve obtained by converting the standardized curve will be.
  • the second problem to be solved by the present invention is to provide a pre-piston engine controlled by the control method of the pre-piston engine described above.
  • the present invention to achieve the first object,
  • the normalization curve is preferably an ideal movement pattern of the pre-piston.
  • the prediction curve may be determined by the following equation.
  • x f (t) is a standardized curve function representing the pre-piston position X at time t
  • n x is a position conversion coefficient that is the ratio of the calculated position value to the measured position value
  • n t is the measurement time Time conversion factor which is a ratio of the calculated time value to a value
  • the specific point includes the top dead center of the pre-piston
  • the position conversion coefficient is the ratio of the calculated position value to the measurement position value at the top dead center
  • the time conversion coefficient is the measurement time value at the top dead center It is preferable that it is the ratio of said calculation time value with respect to.
  • the specific point includes the first augmentation point of the pre-piston
  • the position conversion coefficient is a ratio of the position value of the calculated data to the position value of the measurement data at the top dead center
  • the time conversion coefficient is It is preferable that it is a ratio of the time value of the said calculation data with respect to the time value of the said measurement data in a 1st center point.
  • the specific point includes the bottom dead center of the prepiron, the position conversion coefficient is a ratio of the position value of the calculated data to the position value of the measurement data at the bottom dead center, and the time conversion coefficient is the bottom dead center. Is a ratio of the time value of the calculated data to the time value of the measured data.
  • the specific point may also include a second center point of the prepiston, and the position conversion coefficient may correspond to the position value of the measurement data at the bottom dead center.
  • the time conversion coefficient is a ratio of the time value of the calculated data to the time value of the measured data at the second center point.
  • step (d) the ignition timing and injection timing of the prepiston engine may be controlled using the prediction curve.
  • the position of the prepistone may be represented by a displacement or an angle.
  • a pre-piston engine comprising a combustion cylinder, a prepistron disposed to reciprocate in the combustion cylinder along a movable shaft, an ignition plug installed in the combustion cylinder, and an injector for supplying fuel into the combustion cylinder.
  • An engine control unit controlling an ignition timing of the spark plug and an injection timing of the injector
  • the engine control unit provides a pre-piston engine, characterized in that the control algorithm including a control method of the pre-piston engine using the above-described prediction curve.
  • the control method of the pre-piston engine according to the present invention uses a predictive curve obtained by converting a predetermined standardized curve based on measurement data measured by a pre-piston engine in actual operation, so that the motion is very similar to the actual motion pattern of the pre-piston. Predict patterns.
  • the ignition timing and injection timing of the prepiston engine can be determined using the predicted motion pattern, the prepiston engine can be controlled more accurately, thereby maximizing the control performance and stability of the prepiston engine. .
  • 1 is a schematic structural diagram of a general prepiron engine.
  • 2 is a diagram illustrating a movement pattern of the pre-piston.
  • FIG. 3 is a graph showing the pressure-volume diagram of an Otto cycle.
  • FIG. 4 is a flowchart illustrating a control method of a prepiston engine according to an embodiment of the present invention.
  • 5 is a graph showing the prediction curve of the B section obtained using the measurement curve and the normalization curve of the A section.
  • FIG. 6 is a graph showing a prediction curve of a section C obtained by using the measurement curve and the normalization curve of the section B.
  • FIG. 7 is a diagram illustrating a process of controlling a prepiston engine according to a prediction curve according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a pre-piston engine according to an embodiment of the present invention. [Form for implementation of invention]
  • 1 is a schematic structural diagram of a general prepiston engine.
  • B is the diameter of the bore
  • A is the cross-sectional area of the bore
  • TDC and BDC are the top dead center and the bottom dead center of the pre-piston, respectively
  • P L is the pressure of the left cylinder
  • P R is the pressure of the right cylinder
  • s stroke ( stroke
  • x is the displacement of the prepiston
  • x s is the half stroke
  • Equation 1 The equation of motion of the prepistone having the structure as shown in FIG. 1 is as follows. [Equation 1] Where F f is the frictional force, F ffl is the load absorbing power, and one cycle It can be assumed that the frictional force and the load absorbing force occur within the same.
  • Equation 1 The solution of the differential equation represented by Equation 1 may be used as a standardized curve representing an ideal motion pattern of the prepiston.
  • FIG. 2 is a diagram illustrating a movement pattern of the prepiston to explain the concept of the prepiston control method according to an embodiment of the present invention.
  • Prediction curves in each section can be obtained by coordinate transformation of the above-described standardization curve, and the coordinate transformation method can be performed in angle units or ratio units in the same way as in a reciprocating engine.
  • the center point is a point that is the geometric center of the top dead center and the bottom dead center, means a point where the pre-piston displacement is 0, in this specification, the first center point is the center point that passes when the pre-piston moves from the top dead center to the bottom dead center.
  • the second center point refers to the center point that passes when the prepiston moves from the bottom dead center to the top dead center.
  • FIG. 3 is a graph showing the pressure-volume diagram of an Otto cycle.
  • the Otto cycle shown in FIG. 3 shows the pressure-volume relationship of the left cylinder in the prepiston engine shown in FIG. 1, and the pressure-volume diagram of the right cylinder may be displayed symmetrically.
  • the processes from 1 to 2 are compression strokes
  • the processes from 2 to 3 are explosion strokes
  • the processes from 3 to 4 are expansion strokes
  • the process from 1 'to 1 It is an inertial expansion stroke.
  • the right cylinder goes through the reverse stroke of the above process.
  • the governing equation for the compression stroke from 1 'to 2 is
  • Pc is the pressure in the compression stroke from 1 'to 2
  • Vc is the volume at this time
  • n is the specific heat ratio.
  • Equation 2 When ⁇ ⁇ and V r are determined in Equation 2, Vc is determined by the displacement of the piston, and thus Pc is determined. Meanwhile, in Equation 3, P 3 and V 3 are determined, Ve is determined by the displacement of the piston, and Pe is also determined.
  • Equations 2 and 3 indicate that the C section can be predicted through the B section of FIG. 2 and the A 'section can be predicted through the D section.
  • the actual explosion that occurs during combustion is proportional to the amount of fuel, but the process is so complex that it is virtually unpredictable.
  • the purpose of engine control is to predict the final ignition timing, and the ignition timing can be controlled by the advance or perception conditions by the prediction, so that the top dead center can be controlled constantly.
  • a method of controlling a prepiston engine using a prediction curve according to an embodiment of the present invention will be described.
  • FIG. 4 is a flowchart of a method for controlling a prepiston engine according to an embodiment of the present invention
  • FIG. 8 is a structural diagram of a prepiston engine 100 according to an embodiment of the present invention.
  • a control method of a prepiston engine includes: acquiring measurement data including an axis position value and a measurement time value by calculating the position and time of the prepiston at a specific point (S10); Obtaining calculated data including a calculated position value and a calculated time value by calculating a position and a time of the specific point in a predetermined normalization curve (S20); Determining a prediction curve predicting the movement pattern of the pre-piston after the specific point by converting the normalization curve based on the measured data and the calculated data (S30); And controlling the prepiston engine using the genital prediction curve (S40).
  • the measurement data acquiring step S10 may be performed by using detection means installed in the prepiston engine 100.
  • the detecting means 60 is a device for detecting the time-specific position of the prepiron 30, for example, an encoder installed on the outer circumferential surface of the pre-piston engine 100 may be used. By using such a detection means, the position value and time value of the prepiston at a specific point (for example, top dead center, bottom dead center, center point, etc.) can be measured in real time.
  • Computation data acquisition step (S20) is a step of calculating the position value and time value of the pre-piston at a specific point using a predetermined standardization curve. Assuming that the standardized curve is a solution of the differential equation defined by Equation 1, the calculation data can be easily obtained by substituting the position value X of the prepiston in the solution.
  • the measurement data acquisition step (S10) and the calculation data acquisition step (S20) described above do not necessarily have to maintain their prognostic relationship, and any of the two steps You may perform the steps first.
  • Prediction curve determination step (S30) is a step of determining the prediction curve by converting the standardized curve on the basis of the measurement data and the calculation data obtained in the above-described step.
  • This prediction curve like the normalization curve, is expressed as a function of the position of the prepiston 30 over time.
  • the specific process of determining the prediction curve is as follows.
  • FIG. 5 is a graph showing the prediction curve p of section B obtained using the measurement curve M of section A and the standardization curve S.
  • S is an idealized standard curve representing the position (X) of the prepistone over time (t)
  • S is a measurement curve indicating the movement pattern of the pre-piston actually measured through the above-described means
  • P is Predictive curves for predicting the pre-piston movement pattern.
  • X * and t * denote the position and time values of the prepistone in the normalization curve S, respectively
  • ⁇ ', t' denote the position and time values of the prepistone in the measurement curve M, respectively.
  • t denotes a position value and a time value of the prepistone in the prediction curve P, respectively.
  • the conversion factor for converting the standardized curve is defined as the ratio of the calculated data obtained from the standardized curve to the measured data obtained from the measured curve at a specific point.
  • a transformation coefficient for obtaining a prediction curve of a section B is defined as follows by determining a specific point as a top dead center. [Equation 5]
  • n t is the time conversion factor, which is the ratio of the time value of the normalization curve to the time value of the measurement curve at the top dead center of the prepiston
  • n x is the position conversion coefficient of the measurement curve at the top dead center of the prepiston.
  • the prediction curve is determined as follows. [Equation 6] Therefore, by calculating the position transformation coefficient and the time transformation coefficient from the predetermined normalization curve and the top dead center of the prepiston, the prediction curve which is the motion pattern of the prepistone in the section B can be calculated using Equation (6).
  • FIG. 6 is a graph showing the prediction curve P of the C section obtained using the measurement curve M of the B section and the standardization curve S.
  • the transformation coefficient for obtaining the prediction curve of the C interval may be defined as follows by determining a specific point as the first center point.
  • Equation 7 The time conversion coefficient and position conversion coefficient defined by Equation (7) A prediction curve for predicting the pre-piston motion pattern in the subinterval C region to the prediction curve function defined by Equation 6 may be determined.
  • the time conversion coefficient is defined as the ratio of the time value of the normalization curve to the time value of the measurement curve at the bottom dead center
  • the position transformation coefficient is It is defined as the ratio of the position value of the normalization curve to the position value of the measurement curve at the point.
  • the time conversion coefficient is defined as the ratio of the time value of the normalization curve to the time value of the measurement curve at the second center point
  • the position conversion coefficient is It is defined as the ratio of the position value of the normalization curve to the position value of the measurement curve at the bottom dead center.
  • the prediction curve of the subsequent section may be determined using the measurement curve (or measurement data) and the standardization curve (or calculation data) of the previous section.
  • Pre-piston engine control step (S40) is a step of controlling the pre-piston engine using the prediction curve obtained through the above-described process.
  • the top dead center of the pre-piston can be made constant by adjusting the ignition timing of the spark plug, the injection timing of the injector, etc. using the determined prediction curve.
  • FIG. 7 is a graph illustrating a prediction curve derived in a method of controlling a prepiston engine according to an embodiment of the present invention.
  • the predictive curve of FIG. 7 predicts the driving pattern of the left prepiston in the structural diagram of the prepiston engine shown in FIG. 8, where "L” represents the left prepiston engine 100 and "prefers the right prepiston engine". (100 1 ) is referred to.
  • the ignition timing and injection timing of the prepiston engine may be determined through the prediction curve.
  • the intake, exhaust, and the scavenging valve can be appropriately adjusted by opening and closing the corresponding valve.
  • the standardized curve, the measured curve, and the predicted curve have been described by indicating the displacement of the prepistron position.
  • the prepiston engine can be controlled in the same manner as the conventional reciprocating engine. Can be.
  • FIG. 8 is a structural diagram of a pre-piston engine according to an embodiment of the present invention, wherein the pre-piston engine 100 is arranged to reciprocate the combustion cylinder 10 and the combustion cylinder along the movable shaft 20.
  • the prepiston engine 100 is provided with an intake port 11 and an exhaust port 12 in communication with the combustion cylinder.
  • Pre-piston engines are internal combustion engines using fuels such as hydrogen and two-stroke, one-cycle engines.
  • the pre-piston engine 100 is preferably an opposite pre-piston engine in which the pre-pistons 30 are respectively installed at both ends of the movable shaft 20 for reciprocating linear motion.
  • both pre-piston engines are arranged to alternately explode. Therefore, in order to generate energy by using the driving force in the linear direction transmitted from both prepiron engines, an energy conversion device 80 such as a hydraulic pump or a generator may be installed in the central portion of the movable shaft.
  • the detection means 60 is installed on one side of the pre-piston engine in association with the movable shaft 20, and the movable shaft 20 is installed in a structure capable of detecting the position of the movable shaft over time when the movable shaft 20 performs a reciprocating linear motion. Can be.
  • the engine control unit 70 is equipped with a control algorithm including a control method of the pre-piston engine according to an embodiment of the present invention.
  • the engine control unit 70 is configured to transmit and receive data to and from the detection means 70 and to transmit and receive control signals to and from the injector 50 and the spark plug 40.
  • the injector 50 and the spark plug 40 may be controlled by the engine control unit 70 at an operation time and an operation time. That is, the injection timing (operation time and operation time) of the injector and the ignition timing (operation time and operation time) of the spark plug can be appropriately adjusted using the above-described prediction curve.
  • the pre-piston engine 100 can control the variable stroke based on the predictive curve for predicting the driving pattern of the pre-piston 30, it can be expected a control effect similar to the control of the reciprocating engine.
  • the standardized curve can be represented by various variables such as the angle or the number of ' dimensions ' instead of the displacement of the prepiston.
  • the standardized curve is defined by the angle unit corresponding to the reciprocating engine and the prediction curve is displayed by the angle. Can be controlled in the same way as a conventional reciprocating engine. All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

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

L'invention concerne un procédé de commande d'un moteur à piston libre, le procédé comprenant les étapes consistant à : acquérir des données de mesure contenant une valeur de position mesurée et une valeur de temps mesuré obtenues en mesurant la position et le temps d'un piston libre à un point particulier ; acquérir des données de calcul contenant une valeur de position calculée et une valeur de temps calculé obtenues en calculant la position et le temps au point particulier à partir d'une courbe de normalisation prédéfinie ; établir une courbe prédictive permettant de prédire le profil de mouvement du piston après le point particulier en soumettant la courbe de normalisation à une transformation compte tenu des données de mesure et des données de calcul ; et commander le moteur à piston libre en utilisant la courbe prédictive. L'invention permet de prédire un profil de mouvement du piston libre très proche du profil de mouvement réel du piston libre et donc d'obtenir une commande mieux adaptée du moteur à piston libre.
PCT/KR2009/007155 2009-12-02 2009-12-02 Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé WO2011068258A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/007155 WO2011068258A1 (fr) 2009-12-02 2009-12-02 Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/007155 WO2011068258A1 (fr) 2009-12-02 2009-12-02 Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé

Publications (1)

Publication Number Publication Date
WO2011068258A1 true WO2011068258A1 (fr) 2011-06-09

Family

ID=44115089

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2009/007155 WO2011068258A1 (fr) 2009-12-02 2009-12-02 Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé

Country Status (1)

Country Link
WO (1) WO2011068258A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2576797A (en) * 2018-12-21 2020-03-04 Libertine Fpe Ltd Method and system for controlling a free piston mover

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028362A1 (fr) * 1996-01-30 1997-08-07 Kvaerner Asa Procede de regulation de course dans un generateur diesel de gaz a pistons libres
US20060119350A1 (en) * 2004-12-07 2006-06-08 Global Cooling Bv Apparatus for determining free piston position and an apparatus for controlling free piston position
US20060124083A1 (en) * 2004-12-15 2006-06-15 Denso Corporation Control device for free piston engine and method for the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028362A1 (fr) * 1996-01-30 1997-08-07 Kvaerner Asa Procede de regulation de course dans un generateur diesel de gaz a pistons libres
US20060119350A1 (en) * 2004-12-07 2006-06-08 Global Cooling Bv Apparatus for determining free piston position and an apparatus for controlling free piston position
US20060124083A1 (en) * 2004-12-15 2006-06-15 Denso Corporation Control device for free piston engine and method for the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2576797A (en) * 2018-12-21 2020-03-04 Libertine Fpe Ltd Method and system for controlling a free piston mover
GB2576797B (en) * 2018-12-21 2021-07-21 Libertine Fpe Ltd Method and system for controlling a free piston mover

Similar Documents

Publication Publication Date Title
CN109790789B (zh) 识别内燃机的入口阀行程和出口阀行程相位差的方法
AU737054B2 (en) Internal combustion engines
EP1002939A2 (fr) Dispositif de contrôle de la quantité d'air d'admission pour moteur à combustion interne avec calage de distribution variable
CN110770427B (zh) 用于获取内燃发动机的进气管长度的当前修整量的方法
EP1712760A2 (fr) Commande variable et indirecte de soupape pour un moteur à combustion interne
JP2007211730A (ja) レシプロ式内燃機関
JP5944249B2 (ja) 内燃機関の内部ｅｇｒ量算出装置
EP2942516A1 (fr) Procédé permettant de déterminer le motif d'injection dans la course de compression du cycle de combustion des cylindres d'un moteur à combustion interne à injection directe
US10968844B2 (en) Method for determining the current compression ratio of an internal combustion engine during operation
CN102042108A (zh) 用于确定多缸发动机的缸内压力曲线的方法
CN102135023B (zh) 用于控制内燃机的发动机气门的方法
CN103256125A (zh) 用于内燃机的液压压缩控制均质混合气燃烧的系统
KR101154516B1 (ko) 예측곡선을 이용한 프리피스톤 엔진의 제어방법 및 이에 의해 제어되는 프리피스톤 엔진
WO2011068258A1 (fr) Procédé de commande d'un moteur à piston libre utilisant une courbe prédictive et moteur à piston libre commandé par ce procédé
EP2944796B1 (fr) Procédé permettant de déterminer le motif d'injection dans la course d'admission du cycle de combustion des cylindres d'un moteur à combustion interne à injection directe
WO2006065489A2 (fr) Moteur thermique optimal
CN108868943A (zh) 应用电磁全可变气门的发动机二四冲程切换方法
CN101608574A (zh) Czd差速式往复活塞内燃机
Oguri et al. Development of analysis model for piston movement
JP7327423B2 (ja) 内燃機関における制御装置および内燃機関
Arabacı Analysis of Design Parameters of a Novel Modified Reciprocating Mechanism
Narwade et al. Overview of existing engine system for rail application
JP4173428B2 (ja) 内燃機関の筒内圧検出装置
RU92479U1 (ru) Двигатель стирлинга
JP2008274796A (ja) 可変圧縮比エンジンのトルク推定装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09851875

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09851875

Country of ref document: EP

Kind code of ref document: A1