WO2019021068A1 - Moteur à combustion interne ayant un taux de compression variable - Google Patents

Moteur à combustion interne ayant un taux de compression variable Download PDF

Info

Publication number
WO2019021068A1
WO2019021068A1 PCT/IB2018/052020 IB2018052020W WO2019021068A1 WO 2019021068 A1 WO2019021068 A1 WO 2019021068A1 IB 2018052020 W IB2018052020 W IB 2018052020W WO 2019021068 A1 WO2019021068 A1 WO 2019021068A1
Authority
WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
cylinder
piston
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2018/052020
Other languages
English (en)
Inventor
Sunil WIJESINGHE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2019021068A1 publication Critical patent/WO2019021068A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/041—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of cylinder or cylinderhead positioning
    • F02B75/042—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of cylinder or cylinderhead positioning the cylinderhead comprising a counter-piston

Definitions

  • FIG. 1 shows the induction stroke and the general layout of the preferred embodiment of the invention which is an internal combustion engine where the compression ratio can be varied and the near zero clearance volume ensures zero dilution of the combustion mixture.
  • the piston (1 ) moves in a cylinder placed vertically similar to that found in prior art designs.
  • the said piston is connected to the crank shaft through the connecting rod (24) shown partially in Fig1 .
  • the cylinder bore of the said arrangement provides the major portion of the combustion chamber.
  • the cylinder bore is covered on top by a cylinder head similar to the one found in the internal combustion engine system in prior art.
  • the cylinder head will have an inlet valve and an exhaust valve. Only the inlet valve (20) is shown in Fig 1 .
  • the inlet valve is operated through the valve stem (17), which is pushed by the inlet cam (6) mounted on the cam shaft (14).
  • the valve stem has to be pushed against the compression spring (16) which acts as the return spring.
  • substantially small cylinder is located in the piston head.
  • the volume in the bore of the said small cylinder can be varied via the movement of the piston (2) and provides the minor portion of the combustion chamber.
  • the aggregate combustion chamber consists of the two cylinder bores mentioned here in.
  • the induction stroke will commence immediately with the closing of the exhaust valve (26) and the opening of the inlet valve (20).
  • the piston (1 ) of the large main cylinder now starts to move downwards and creates a suction pressure drawing the air-fuel mixture in to the combustion chamber.
  • the piston (2) of the small secondary cylinder moves upwards. This movement is restricted to a pre-determined position as determined by a combination of the throttle opening and engine load as transmitted by the accelerator pedal position and is determined by the connecting linkage and the screw rod (23).
  • the combustion chamber will consist of the combination of the two volumes created by the main cylinder and the small secondary cylinder. This volume is now filled completely with the air-fuel mixture drawn in through the inlet valve (20). Since there was no burnt gas left from the previous cycle, there will be no dilution.
  • the completion of the induction stroke will be the commencement of the compression stroke (Fig 2).
  • the combustion chamber comprises the two spaces of the two cylinders.
  • the volume of the small cylinder will remain un-changed during this stroke as the piston (2) will remain stationary.
  • the combustion chamber is now filled with the fresh air-fuel mixture fed to it.
  • the upward movement of the piston (1 ) will cause the total volume of the combustion chamber to get compressed.
  • all the air-fuel mixture will get compressed in to the volume of the small secondary cylinder.
  • the compression ratio is determined by the ratio of the volumes of the two cylinder bores. It must be noted here that the volume of the small cylinder is dependent on the positon of the piston (2), as determined by the cam roller (13), explained here in.
  • the volume of the small cylinder can be varied as needed. This facilitates a variability of the compression ratio. This ratio is determined by a combination of the rocker actuating cam (5) and the throttle opening required for the particular pulling power as requested by the driver through the accelerator pedal and the consequent throttle position.
  • the compressed mixture with its stoichiometric ratio, is now ready for the ignition in the usual manner.
  • the ignition is actuated by the spark plug placed at the centre of the small secondary piston (2) and ignition timing is actuated at a pre-determined. Since the spark is generated at the centre of the compressed volume, it will spread evenly in the compressed air-fuel mixture.
  • the bore of the conventional cylinder is supplemented with a bore of a small secondary cylinder placed in the engine head, thereby making a larger combustion chamber.
  • the volume of the small secondary cylinder appended to the combustion chamber of prior art can be varied as needed, during the four strokes of the cycle. This mechanism described in the present
  • the embodiment describes the mechanical means of changing the effective volume of the engine's combustion chamber to control the engine's compression ratio as a function of engine load.
  • the small secondary cylinder volume at any stage is determined by the position of the movable piston (2). This position is determined by the bell-crank shaped rocker arm (1 1 ) operated by the cam (5).
  • the throttle position also gives a feedback signal to determine the volume of the small cylinder.
  • the inlet and exhaust valves are activated by two separate cams mounted on same the cam shaft, similar to the traditional four stroke engine.
  • the compression stroke is the small cylinder volume.
  • the main piston (1 ) will gradually move up and eventually will ensure a near zero volume to the combustion chamber.
  • the combustion chamber will comprise only the volume of the small cylinder.
  • the compression ratio is determined by the volumes of the two cylinders. Variability of the compression ratio is obtained by the variability of the small cylinder volume as described here in.
  • the compressed air fuel mixture is ready for ignition in the usual manner. Once the combustion takes place, the piston will gradually get pressed causing the power to be delivered to the crank shaft through the connecting rod as usual. At the completion of the power stroke, the exhaust stroke will commence.
  • Primary objective of this invention is optimizing the fuel efficiency of an internal combustion engine by varying the compression ratio. This is achieved by varying the engine's compression ratio by varying the combined effective volume of its combustion chamber.
  • the mechanism described here is replicated at each of the cylinders in the case of multi-cylinder engines.
  • the preferred embodiment described here refers to the simplest design that incorporates the present inventive concept. It can very well be adapted to the fuel injection type with minor changes. It is also applicable to variable valve timing engines and compression ignition type. Basically all types of internal combustion engines could incorporate the concept given in the present invention.
  • the required control system for the variable compression ratio is achieved pure mechanical means, with the use of cams and levers.
  • the same objectives can be achieved using a hydraulic, electronic or electrical means or a combination of these with the mechanical means described in this embodiment.
  • the bore of the conventional cylinder is supplemented with a bore of a small cylinder placed in the engine head, thereby making an enhanced combustion chamber.
  • the volume inside the small cylinder can be varied as per demand, during the four strokes of the cycle.
  • This mechanism described in the present embodiment describes the mechanical means of changing the effective volume of the engine's combustion chamber to control the engine's compression ratio as a function of engine load demand.
  • the small cylinder volume at any point is determined by the position of the movable piston and its position is determined by the bell-crank shaped rocker arm operated by the cam mounted on the cam shaft.
  • the throttle position also gives a feedback signal to determine the volume of the small cylinder.
  • the inlet and exhaust valves are activated by two separate cams, operated by the cam shaft, similar to the conventional four stroke engine of prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

Selon l'invention, la chambre de combustion d'un moteur à combustion interne classique selon l'état antérieur de la technique est complétée par un espace cylindrique sensiblement petit situé dans la tête de cylindre. Le volume dudit petit cylindre peut varier grâce à un piston qui définit la surface supérieure variable du cylindre, activé par un mécanisme couplé au mouvement de vilebrequin, le piston du petit cylindre étant positionné en un emplacement prédéterminé le long de sa trajectoire, déterminé par la position de pédale d'accélérateur et la demande de puissance. Les changements du petit volume cylindrique produisent la variabilité du taux de compression.
PCT/IB2018/052020 2017-07-27 2018-03-26 Moteur à combustion interne ayant un taux de compression variable Ceased WO2019021068A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LK19415 2017-07-27
LK1941517 2017-07-27

Publications (1)

Publication Number Publication Date
WO2019021068A1 true WO2019021068A1 (fr) 2019-01-31

Family

ID=61972569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/052020 Ceased WO2019021068A1 (fr) 2017-07-27 2018-03-26 Moteur à combustion interne ayant un taux de compression variable

Country Status (1)

Country Link
WO (1) WO2019021068A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR909061A (fr) * 1945-02-05 1946-04-29 Dispositif de variation du volume de la chambre de compression ou d'explosion des moteurs
DE754005C (de) * 1941-12-05 1952-04-17 Willy Hopf Doppelkolben-Viertaktbrennkraftmaschine
US2970581A (en) * 1957-11-15 1961-02-07 Georges Raymond Internal combustion engines the compression ratio of which is adjustable in operation
DE10045107A1 (de) * 2000-09-12 2002-03-28 Bernhard Stingl Doppelkolbenmotor
US20150369139A1 (en) * 2014-06-18 2015-12-24 Ford Global Technologies, Llc Method and system for adjusting a compression ratio
WO2016150231A1 (fr) * 2015-03-25 2016-09-29 韩培洲 Moteur à combustion interne ayant une chambre de combustion à volume variable et un piston auxiliaire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754005C (de) * 1941-12-05 1952-04-17 Willy Hopf Doppelkolben-Viertaktbrennkraftmaschine
FR909061A (fr) * 1945-02-05 1946-04-29 Dispositif de variation du volume de la chambre de compression ou d'explosion des moteurs
US2970581A (en) * 1957-11-15 1961-02-07 Georges Raymond Internal combustion engines the compression ratio of which is adjustable in operation
DE10045107A1 (de) * 2000-09-12 2002-03-28 Bernhard Stingl Doppelkolbenmotor
US20150369139A1 (en) * 2014-06-18 2015-12-24 Ford Global Technologies, Llc Method and system for adjusting a compression ratio
WO2016150231A1 (fr) * 2015-03-25 2016-09-29 韩培洲 Moteur à combustion interne ayant une chambre de combustion à volume variable et un piston auxiliaire

Similar Documents

Publication Publication Date Title
US3970056A (en) Variable compression ratio control system for internal combustion engines
CN104040152A (zh) 用于切断和激活内燃机气缸的方法
WO2009152592A1 (fr) Moteur à combustion interne à piston de travail et piston de commande
RU2015134362A (ru) Устройство и способ для управления двигателем внутреннего сгорания
US7556014B2 (en) Reciprocating machines
JP6410813B2 (ja) 内燃エンジン
JPS5685527A (en) Double piston combustion chamber moving type internal combustion engine
US9279350B2 (en) Intake valve closure control for dual-fuel engines
WO2019021068A1 (fr) Moteur à combustion interne ayant un taux de compression variable
RU2042846C1 (ru) Двигатель внутреннего сгорания
US20140326202A1 (en) Six Stroke Internal Combustion Engine and a Method of Operation
CN107110042A (zh) 柴油发动机以及用于起动柴油发动机的方法
US1805931A (en) Internal combustion engine
US7673596B2 (en) Six-cycle internal combustion engine
US3470856A (en) Four stroke stratified engine
US2170818A (en) Internal combustion engine
CN107110032A (zh) 柴油发动机以及用于使柴油发动机运行的方法
JP2018017164A (ja) 内燃機関の制御装置
WO2012035285A1 (fr) Moteur à 'cycle blackburn' à six temps
US1503383A (en) Internal-combustion engine
US3450110A (en) Power unit
US1475370A (en) Oil engine
CN202250388U (zh) 四行程汽油机
CN101400882B (zh) 用于运行内燃机的方法和装置
US653876A (en) Gas-engine.

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: 18718000

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: 18718000

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 18718000

Country of ref document: EP

Kind code of ref document: A1