EP2024622A1 - Procede et systeme de pilotage continu de la position d'un actionneur de changement de taux de compression d'un moteur thermique - Google Patents
Procede et systeme de pilotage continu de la position d'un actionneur de changement de taux de compression d'un moteur thermiqueInfo
- Publication number
- EP2024622A1 EP2024622A1 EP07788951A EP07788951A EP2024622A1 EP 2024622 A1 EP2024622 A1 EP 2024622A1 EP 07788951 A EP07788951 A EP 07788951A EP 07788951 A EP07788951 A EP 07788951A EP 2024622 A1 EP2024622 A1 EP 2024622A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- cylinder
- movable
- lever
- jack
- 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.)
- Granted
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
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
Definitions
- the present invention relates to the field of thermal engines, and proposes in particular a method and a system for continuously controlling the position of a compression ratio change actuator of a heat engine.
- the volumetric ratio is the ratio of the volume of the combustion chamber when the piston is at the bottom dead point (PM B) in the cylinder and the volume of the combustion chamber in the combustion phase, with the piston in the top dead center position (TDC).
- PM B bottom dead point
- TDC top dead center position
- the object of the present invention is to overcome certain disadvantages of the prior art by proposing a control method which makes it possible to continuously and automatically adjust the position of the actuator for changing the compression ratio of a heat engine.
- This object is achieved by a method of continuously controlling the position of a compression ratio change actuator of a heat engine, implemented by a control system including a jack type actuator for driving a damping mechanism.
- a servo-control device for controlling the displacement of the jack and means of control of the servo-control device, the method comprising a control step by the control means of a movement of the jack, characterized in that said control step comprises: a step of moving on a first determined distance from a point of articulation of a lever connected by another point of articulation with a movable cylinder member projecting from a cylinder body; and
- the step of controlling the displacement of the jack comprises the generation of a position setpoint by an electric stepping motor causing the displacement according to said first determined distance of the point of articulation between the lever and an actuator member. positioning associated with the electric motor.
- the fluid injection step is triggered by a translational movement step of a multi-lane mobile circuit part of the distribution means, integral with the control member, said injection step being performed as long as the movable circuit portion extends a fixed circuit portion of the distribution means for supplying fluid to two actuator inputs disposed on either side of a stroke zone of a piston of the cylinder.
- the mechanical type of regulation step is initiated by a rotation of the lever around the point of articulation of the lever with the positioning member, this rotation of the lever being driven via the other point of articulation with the movable element of cylinder.
- the mechanical type of regulation step comprises a step of translation displacement of a multi-lane mobile circuit part of the distribution means, integral with the control member, said injection step being stopped as soon as the movable circuit part is offset relative to a fixed circuit part of the distribution means for supplying fluid to two actuator inputs disposed on either side of a stroke zone of a cylinder piston .
- the mechanical type of regulation step comprises a step of immobilization of the movable element of cylinder, in which a valve of the fluid distribution means completely closes the accesses to the jack.
- a further object of the present invention is to provide a simple servo-controlled system for quickly and optimally controlling the position of a compression rate change actuator.
- the invention relates to a system for continuously controlling the position of a compression ratio change actuator of a heat engine, comprising a cylinder-type actuator movable in translation between two ends, making it possible to drive a mechanism for adjusting the variation of the compression ratio by modifying the stroke of at least one piston of the engine, a source of pressurized fluid associated with a circuit for allowing the cylinder to move in two opposite directions, a device for servo-control for controlling the displacement of the jack and the control means of the servo-control device, characterized in that the servo-control device comprises:
- Fluid distribution means for controlling the position of a movable cylinder member protruding from a cylinder body
- the control means of the servo device comprising a movable member in translation connected to the lever by a third point of articulation further from the first point of articulation than the second point of articulation.
- the distribution means comprise: a fixed circuit part including connections with two respective ducts for supplying fluid to two actuator inputs disposed on either side of a stroke zone of a piston of the piston; cylinder; and - A multi-channel mobile circuit part, driven in translation by the control member.
- the dispensing means comprise a three-position and four-way valve or distributor with two channels being connected to the jack and a channel being connected to the source of fluid under pressure.
- control means comprise an electric stepper motor associated with a positioning member of the third pivot point of the lever for generating a position command, the positioning member being movable in translation between two corresponding ends. each at an end position of the movable cylinder member.
- the system according to the invention makes it easy to size the electric motor that does not develop the force but is assisted by the hydraulic cylinder.
- the actuator of the jack type is disposed along a first axis parallel to the axis of translation of the movable member of the control means and to an intermediate axis of translation of the movable control member means of distribution.
- the distance between the first axis and the intermediate axis is greater than the distance between the intermediate axis and the translation axis of the movable member of the control means.
- FIG. 1 is an explanatory diagram showing a hydraulic actuator for driving the mechanism for varying the compression ratio, slaved according to a mechanical regulation mode of the system according to the invention
- FIG. 2 shows a linear analysis of the operation of a slave system according to the invention
- FIG. 3 represents a step diagram of the method for controlling the position of the actuator according to one embodiment of the invention.
- the control system makes it possible to continuously adjust the position of a cylinder (2) actuator for changing the compression ratio of a heat engine, with a regulation of the mechanical type.
- a source of pressurized fluid (S) is associated with a circuit to allow movement of the cylinder (2) in two opposite directions.
- the actuator can thus consist of a cylinder (2) hydraulic double effect single rod.
- a system according to the invention can be used to control for example the angular portion of an eccentric axis which acts mechanically on the variation of the compression ratio, as in EP 1418 322.
- a system according to the invention can also control the position of a rack which acts on the variation of the compression ratio as in the document FR 2 763 097.
- a rod end of cylinder is integral with the mechanism for adjusting the compression ratio. By controlling the displacement of such a cylinder rod end, it is allowed to adjust the variation of the compression ratio.
- the servo-control device (4) associated with the cylinder (2) comprises fluid distribution means (V) for controlling the position of a movable cylinder element (21) protruding with respect to a cylinder body (22). .
- Control means (1) for controlling the position are also provided for controlling the servo device (4).
- a mechanical connection made for example by a lever with three joints makes it possible to connect the movable cylinder element (21), a control member (40) of the distribution means (V) and a lever drive member (12). (3) control means (1).
- the lever (3) articulated with the moving cylinder element (21) at a first articulation point (31) comprises a second articulation point (32) with the control member ( 40) movable in translation controlling the dispensing means (V).
- Lever (3) can rotating around the first articulation point (31) by means of control means (1) which trigger a displacement of the lever driving member (12) which is connected opposite the third point d articulation (33).
- the third hinge point (33) is further away from the first hinge point (31) than the second hinge point (32).
- this second intermediate hinge point (32) supports the control member (40) which drives in translation a multi-lane mobile circuit part of the distribution means (V).
- the distribution means (V) comprise a fixed circuit part including connections with two pipes (C1, C2) respectively for supplying fluid to two inputs of the jack (2) disposed on either side of a travel zone of the piston (20) of the cylinder (2).
- the movable circuit portion can be moved relative to the fixed circuit portion in a translation movement along a translation axis (A2) of the control member (40).
- the dispensing means (V) comprise a valve or distributor with three-position spool (PO, P1, P2) and four lanes, two lanes being connected to the jack (2) and one lane being connected to the source of fluid under pressure (S).
- PO, P1, P2 three-position spool
- S source of fluid under pressure
- the dispenser can be of bistable type with a roller control or any other similar command (push button for example).
- the control means (1) comprise an electric stepper motor (10) associated with a positioning member (11) of the third articulation point (33). ) of the lever (3).
- the electric motor (10) can thus generate a position command.
- the positioning member (11) is movable in translation between two ends each of which may correspond to an end-of-travel position of the movable cylinder member (21).
- the electric stepper motor (10) is of low power and associated with a screw-nut type device.
- a step may correspond to a 2 mm displacement of the position of the positioning member (11) of the third articulation point (33).
- the control means (1) can trigger a displacement on a first determined distance (Xm) from this point of articulation (33) of the lever (3) when an instruction (I) is received. from an electronic unit for monitoring and managing the compression ratio (not shown).
- Xm first determined distance
- the actuator cylinder (2) can not be moved and the first pivot point (31) initially forms a pivot of rotation of the lever (3).
- the electric motor (10) triggers a movement of the lever (3).
- the position setpoint is created by means of the electric stepper motor (10) from the instruction (I), each step corresponding to a minimum travel step of position.
- the distribution means (V) are controlled simultaneously by the electric motor (10) and the position of the stop (B) formed at the level of the first articulation point (31) of the lever (3). .
- a rotational movement of the lever (3) occurs around the first point of articulation (31).
- the lever (3) allows the realization of a mechanical control in position.
- the mechanical connection between the jack (2), the distributor (V) and the finger forming the positioning member (11) of the electric motor (10) may consist of a lever of suitable shape.
- the lever does not have a fixed marker and evolves according to the position of each of the three components that it connects.
- the electric motor (10) imposes a set longitudinal position on his finger moved along the axis (A3) of translation of the third point of articulation (33).
- This positioning member (11) formed by a finger then actuates via the lever (3) a displacement of the valve according to the gear ratio:
- L represents the distance (L) between the first axis (A1) of the cylinder (2) and the intermediate axis (A2);
- I represents the distance (I) between the intermediate axis (A2) and the third axis (A3) of translation of the movable member (12) of the control means (1).
- the lever (3) can therefore articulate from its connection with the cylinder (3).
- the aforementioned ratio can be between 0.5 and 0.9 with the intermediate axis (A2) closer to the third axis (A3) than the first axis (A1).
- the gear ratio for the displacement of the valve can be chosen less than 0.5.
- the displacement of the movable circuit part of the distribution means (V) allows access of the fixed circuit fixed part to a position (P1, P2) of fluid flow to the cylinder (2).
- This has the effect of moving the cylinder (2) in the opposite direction of the finger forming the positioning member (11) of the electric motor (10).
- the extent (Xve) of the displacement of the movable cylinder member (21) is limited insofar as this displacement has the effect of closing the dispensing valve, as shown on the right of Figure 2.
- a return to the position resting point (PO) is triggered by the displacement of the movable cylinder member (21).
- the third hinge point (33) is then frozen as the electric motor (10) has stopped.
- the displacement of the movable cylinder member (21) generates an additional rotation of the lever (3) with an effect on the control member (40) of the distribution means (V) which is opposite to the effect exerted during rotation about the first hinge point (31).
- the system according to the invention can be modeled for the correction, in a simplified manner with a transfer function of the following type:
- the control system according to the invention is naturally dimensioned adequately with respect to the characteristics of the variable compression ratio engine to which the actuator cylinder (2) is connected.
- the cutoff frequency of the corrector thus formed must be chosen so as not to cause instability.
- a cutoff frequency such as:
- the control method in the position of the actuator cylinder (2) for driving the mechanism for adjusting the position of the engine heat pistons provides a step (5) for controlling by the control means (1) a movement of the actuator (2).
- the control step (5) first comprises a step (50) of displacement over a predetermined distance (Xm) of the articulation point (33) of the lever (3) opposite to the hinge point (31) fixed lever (2) located at the cylinder (2).
- this displacement of the third hinge point (33) is driven by the positioning member (11) associated with the electric motor (10).
- the method provides during the control step (5) the generation of a position command via the electric stepper motor (10).
- the electric motor (10) can be of low power and a power amplification is obtained between the setpoint and the range (Xve) of the displacement of the actual position of the stop (B) of the movable element (21) of the jack (2).
- the control step (5) comprises a step (52) for injecting fluid into the jack (2), in which the fluid distribution means (V) connected to the jack (2) make it possible to carry out the step (53) for changing the position of the movable cylinder member (21).
- the injection step (52) is triggered by the control member (40) of the dispensing means (V).
- This control member (40) is for example movable in translation and secured to the lever (3) by the point of articulation (32) intermediate.
- each hinge point (31, 32, 33) may be provided with a cam or a similar mechanical connecting member.
- a step (51) of displacement in translation of a multi-lane mobile circuit part of the distribution means (V), integral with the control member (40), makes it possible to control the injection step (52) of fluid.
- This injection step (52) can be performed as long as the movable circuit portion extends the fixed circuit portion of the distribution means (V) for supplying fluid to the two inputs of the cylinder (2). These inputs are arranged on either side of the piston stroke zone (20) of the cylinder (2). A valve or spool valve can be used to trigger / stop the injection according to the command provided by the controller (40).
- the piston (20) of the cylinder (2) will be displaced along the axis (A1) of translation in one direction or another.
- the displacement of the movable cylinder element (21) takes place, either in a first direction of withdrawal when the positioning member (11) moves backwards, or in a second thrust direction when the positioning member (11) extends.
- in the first direction of movement corresponds the first active position (P1) of the slide valve: there is withdrawal of the movable cylinder member (21).
- the second active position (P2) corresponds to the second direction of movement: the movable element of cylinder (21) advances and exerts a thrust on the mechanism for adjusting the position of the engine heat pistons.
- the control step (5) is followed by a step (54) of mechanical type regulation of the position of the moving cylinder element (21).
- the lever (3) drives the control member (40) in an orientation in correspondence with the direction of movement of the step (53) for modifying the position of the jack (2). This stops the fluid injection.
- This step (54) of mechanical type regulation is initiated by a rotation of the lever (3) around the third hinge point (33). The rotation of the lever (3) is itself driven from the other point of articulation (31) with the movable member of cylinder (21) moving.
- the method comprises a step (55) of displacement in translation of the multi-channel mobile circuit part of the distribution means (V).
- the injection step (52) can be stopped as soon as the movable circuit portion is offset relative to a fixed circuit portion of the distribution means (V).
- the regulation step then ends with a step of immobilizing the movable cylinder element (21), in which the valve of the fluid distribution means (V) completely closes the accesses to the cylinder (2). It is understood that this succession of steps occurs in a very short time interval, which makes the steering system efficient.
- control system can be integrated outside the engine casing, a line pressure must simply be available.
- system eliminates electronic loopback.
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)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0605051A FR2902145B1 (fr) | 2006-06-07 | 2006-06-07 | Procede et systeme de pilotage continu de la position d'un actionneur de changement de taux de compression d'un moteur thermique |
| PCT/FR2007/051115 WO2007141434A1 (fr) | 2006-06-07 | 2007-04-13 | Procede et systeme de pilotage continu de la position d'un actionneur de changement de taux de compression d'un moteur thermique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2024622A1 true EP2024622A1 (fr) | 2009-02-18 |
| EP2024622B1 EP2024622B1 (fr) | 2010-02-17 |
Family
ID=37022933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07788951A Ceased EP2024622B1 (fr) | 2006-06-07 | 2007-04-13 | Procede et systeme de pilotage continu de la position d'un actionneur de changement de taux de compression d'un moteur thermique |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20100294244A1 (fr) |
| EP (1) | EP2024622B1 (fr) |
| JP (1) | JP2009540187A (fr) |
| AT (1) | ATE458138T1 (fr) |
| DE (1) | DE602007004844D1 (fr) |
| FR (1) | FR2902145B1 (fr) |
| WO (1) | WO2007141434A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES3038063T3 (en) * | 2016-12-14 | 2025-10-09 | Hedman Ericsson Patent Ab | Method for providing variable compression ratio in an internal combustion engine and actuator for said method |
| DE102017109358A1 (de) * | 2017-04-10 | 2018-10-11 | Avl List Gmbh | Steuervorrichtung für ein VCR-Pleuel zum Ermitteln eines Defekts |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB681310A (fr) * | 1900-01-01 | |||
| US2145017A (en) * | 1936-04-16 | 1939-01-24 | Tsuneda Kenjiro | Variable compression ratio internal combustion engine |
| US2433639A (en) * | 1942-09-24 | 1947-12-30 | Woodruff John Melvin | Adjustable combustion chamber for internal-combustion engines |
| US2472934A (en) * | 1943-06-01 | 1949-06-14 | Alan Muntz & Co Ltd | Control means for internal-combustion-operated free-piston machines |
| GB828785A (en) * | 1957-09-27 | 1960-02-24 | Sperry Gyroscope Co Ltd | Control apparatus for aircraft |
| FR1588700A (fr) * | 1968-04-25 | 1970-04-17 | ||
| US3970056A (en) * | 1974-10-11 | 1976-07-20 | Morris Kenneth B | Variable compression ratio control system for internal combustion engines |
| US4827882A (en) * | 1985-07-16 | 1989-05-09 | Paul Marius A | Internal regenerative combustion engines with thermal integrated optimized system |
| JP2728652B2 (ja) * | 1996-03-22 | 1998-03-18 | 株式会社コミュータヘリコプタ先進技術研究所 | 高調波制御アクチュエータ装置 |
| FR2763097B1 (fr) * | 1997-05-09 | 1999-09-03 | Vianney Paul Rabhi | Dispositif permettant de controler la position de la cremaillere de commande d'un moteur a cylindree variable |
| US6260532B1 (en) * | 1998-09-28 | 2001-07-17 | Edward Charles Mendler | Rigid crankshaft cradle and actuator |
| JP3941371B2 (ja) * | 2000-10-12 | 2007-07-04 | 日産自動車株式会社 | 内燃機関の可変圧縮比機構 |
| JP4096700B2 (ja) * | 2002-11-05 | 2008-06-04 | 日産自動車株式会社 | 内燃機関の可変圧縮比装置 |
| US7055469B2 (en) * | 2003-02-18 | 2006-06-06 | Caterpillar Inc | Combustion engine variable compression ratio apparatus and method |
-
2006
- 2006-06-07 FR FR0605051A patent/FR2902145B1/fr not_active Expired - Fee Related
-
2007
- 2007-04-13 DE DE602007004844T patent/DE602007004844D1/de active Active
- 2007-04-13 AT AT07788951T patent/ATE458138T1/de not_active IP Right Cessation
- 2007-04-13 EP EP07788951A patent/EP2024622B1/fr not_active Ceased
- 2007-04-13 WO PCT/FR2007/051115 patent/WO2007141434A1/fr not_active Ceased
- 2007-04-13 JP JP2009513732A patent/JP2009540187A/ja not_active Ceased
- 2007-04-13 US US12/303,887 patent/US20100294244A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007141434A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2902145B1 (fr) | 2008-08-08 |
| US20100294244A1 (en) | 2010-11-25 |
| JP2009540187A (ja) | 2009-11-19 |
| DE602007004844D1 (de) | 2010-04-01 |
| ATE458138T1 (de) | 2010-03-15 |
| FR2902145A1 (fr) | 2007-12-14 |
| EP2024622B1 (fr) | 2010-02-17 |
| WO2007141434A1 (fr) | 2007-12-13 |
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