FR2634519A1 - INTERNAL COMBUSTION ENGINE WITH TURBOCHARGER IN WHICH THE ARRIVAL OF THE FUEL IN CERTAIN CYLINDERS CAN BE CUT - Google Patents

Abstract

A turbocharged internal combustion engine in which the fuel supply to certain cylinders 12 can be cut off. The engine 10 is supercharged by several turbochargers 16, 17, 18 connected in parallel, at least one of which 16, 17 can be taken out of service. The intake and exhaust periods of the cylinders overlap. The gas intake manifold 33 of the turbochargers 18, which are constantly operating, contains an automatic shut-off device 34, consisting of a butterfly valve which the gas stream can open, against the closing force of a spring, when the engine is running. at full speed, and which has an opening, which cannot be closed, calibrated so that this throttle does not open at idle speed or under low engine load. Application in particular to high power engines for vehicles.

Description

The present invention relates to a combustion engine

  supercharged internal piston arrangement, in which the fuel supply in certain cylinders can be cut off and which is exhausted by at least one exhaust gas turbocharger which can be put into service and cut, and

  that an exhaust gas turbocharger

  in service while the engine is running.

  The purpose of such an arrangement is to ensure that in steady state the engine is optimally engaged and the fuel consumption is minimal. For this purpose, while idling and under partial load, only

  some (active) cylinders provide energy.

  Patent DE-C1-3 704 967 discloses a motor of the above kind, in which the cylinders, cut from the source

  fuel, continue to operate without delivering energy.

  The intake and exhaust cycles of these cylinders are not different from those of the active cylinders, so that even when they are isolated, they are still powered, but

  unioue4ent with air. Since I do not have any contribution of

    By their combustion, these intake and exhaust cycles of the insulated cylinders take place at a much lower temperature level than that of the active cylinders. The average temperature of these insulated cylinders is therefore much lower than

that of active cylinders.

  When the applied load increases and forces

  being serviced by cylinders that were not powered

  fuel, it occurs, depending on the ambient temperature

  and that of the engine, an undesirable and inappropriate

exhaust gas missile.

  The object of the invention is to prevent an inadmissible

  exhaust missible when the load applied to the

  engine reaches a value at which non-powered cylinders

  fuel are returned to service.

  In a supercharged internal combustion engine according to the invention, in which the fuel supply

  in some cylinders can be cut and with which coopS-

  a plurality of parallel-connected turbochargers, at least one of which can be put into service and stopped, each of the turbochargers which can be stopped comprises, upstream of the gas inlet orifice in its turbine, an adjustable shutter device, and upstream of the air inlet of its compressor, an automatic shutter device, and

  one of the other turbochargers comprises a device for

  exhaust gas, which is formed of a throttle that the exhaust gas stream can automatically bring into

  opening position against the action of a spring, and the mechanism

  engine timing causes the periods to overlap

  intake and exhaust cylinders.

  In one embodiment of the invention, when the throttle butterfly, which rotates on an axis, cooperates with a turbocharger constantly in service, this butterfly

  may have a non-closable opening, calibrated according to

  exhaust flow during idling.

  ti. This axis may have an off-center position with respect to

center of gravity of the butterfly.

  Idling and low partial load, when

  some cylinders and the corresponding turbochargers are put out of service, the exhaust gases are forced back into the

  exhaust pipe common to all cylinders, because the

  Stopper is automatically closed by spring action due to the low flow rate of these gases. In cooperation with

  overlap of the intake and exhaust times of

  lindres, this repression causes a reflux of gases in all

  cylinders, even those not fueled

  rant. This significantly increases the temperature above all

  yenne of these last non-powered cylinders. This increase

  the temperature improves the desired

  the emission of engine exhaust, when

  it is overloaded.

  Advantages provided by the invention include that the temperatures of the engine components are uniform throughout the operating range of the engine; that there is no need for equipment

  to control and adjust the self-closing butterfly

  matic; and that it is possible to equip later and

  economically of this arrangement an existing engine.

  An exemplary embodiment of the invention will be described below in more detail by way of illustration and in no way limiting, with reference to the appended drawing, in which:

  FIG. 1 schematically represents a motor with

  internal combustion with two turbochargers that can be decommissioned and another turbocharger constantly

  in service, as well as cylinders whose car-

burant can be cut off; and

  FIG. 2 represents the detail I of FIG.

  the automatic throttle of the intake manifold

exhaust gas.

  An internal combustion engine 10 with pistons comprises two groups of cylinders 11 and 12, which a tube com = a 13

  feeds in supercharged compressed air. A collector of

  14 cooperates with these cylinders 11 and 12. The air of su-

  raliration is provided to the mote-r 10 by three turbochargers

  16, 17, 1º with exhaust gas, in parallel, which com-

  take each one a turbine 19, 20, 21 fed by the gases

  and a compressor 22, 23, 24 of overflow air

tation.

  Turbochargers 16 and 17 can be put into service.

  this and out of service via devices 27, 2E

  adjustable gas shutters, which are mounted in the tubulu-

  25, 26 respectively for the admission of gases and devices

  29, 30 automatic air shutters, which control the

  _ures 31,, 2 air intake airing. Lorsuue

  the engine 10 is running at full speed and all cylinders

  11 and 12 provide energy, the three turbochargers

  16, 17, 18 are in use. In idling and under low partial load, only the turbocharger 18, which can not be shut down, operates by supplying the engine with 10

  overeating. The cylinders 12 are then isolated from the source

  it's fueling and they work without delivering energy. The distribution mechanism, which controls all

  cylinders 11 and 12 of the engine 10 overlap the

  intake and exhaust of these cylinders.

  An exhaust gas shutoff device 34 is mounted in the exhaust gas feed pipe 33 of the turbine 21 of the turbocharger 18 which can not be taken out of service. This device 34 is composed of a throttle 35, integral in rotation with an axis 39, and a lever 37, which is also integral in rotation with this axis 39 and to which is fixed a spring 38 holding this throttle 35 in position closure. The axis 39 is eccentric with respect to the center of gravity of the surface of the throttle valve 35. Consequently, an exhaust gas stream impinging on this closed throttle 35 creates a rotational torque.

  yes it works in the sense of openness. The Butterfly 35 is

  automatically when the value of this couple is higher than

  re to that of the closing force exerted by the spring 38.

  A non-closable opening 36 is formed in the butterfly 35.

  The force of the spring 38 and the dimensions of this opening 36 are determined so that the butterfly remains closed against

  gas emissions from the engine 10

  while idling or under light load. These gases flow back into the exhaust manifold 14, upstream of the shutter device 34. In cooperation with the overlap

  the cylinder inlet and outlet peorodes, this

  flow returns the gases in cylinders 11 and 12, which substantially increases the average temperature of the cylinders 12 not supplied with fuel, so that at the time of a new overload causing the commissioning of all the cylinders

  11 and 12, the engine 10 operates without releasing an inappropriate amount.

exhaust gas missile.

  It goes without saying that it is possible without departing from

  of the invention, to make various modifications to the engine

  turbocharger with high power for vehicles,

described and described.

Claims (3)

REVENE ICATIONS   1. Piston-internal combustion rating, saturated, in which the fuel supply in some cylinders (12)   can be cut and with which cooperate several turbocom-   parallel-operated presses (16, 17, 18), at least one of which (16, 17) can be put into operation and out of operation, the engine (10) characterized in that each of the turbocompressors (16, 17),   may be put out of service, includes upstream of the ori-   this admitted-ior of gas in its turbine (1w, 20) a device obt-   adjustable turner (27, 2E) and upstream of the inlet   of its air compressor (22, 23) an automatic shutter device   Attic (29, 30), one (18) turbocharger comprising an exhaust gas shut-off device (34), which is composed of   of a throttle valve (235), where the exhaust gas   automatiouement to open positior against the action   spring (38), and the motor distribution mechanism 10   overlap the periods of admission and exhaust   2. The engine is in accordance with claim 1,   terisê in that the pa. gas shutdown (35), which can   on an axis (39) and which cooperates with a turbocomp esseur (, l) remaining consta-.ent in service cc = carries an opening (36) non-closable, calibrated according to the flow of exhaust gases : end-t idling.   Supercharged engine according to one of claims 1   and 2, characterized in that the axis (39) is eccentrically distributed   relative to the thrust center of the butterfly (35).