• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of controlling the amount of air introduced into the intake of a supercharged internal combustion engine, said engine comprising two exhaust gas outlets (32, 36) each connected to an exhaust manifold (30, 34 ) of a group of at least one cylinder (121, 122, 123, 124), comprising a supercharging device (38) having a turbocharger with a dual inlet turbine (40) (46 48) connected to said gas outlets exhaust system as well as an external air compressor (44), and a partial transfer line (64) of compressed air from the compressor to the turbine inlets. According to the method, two branches (70, 72) are fitted to said partial transfer duct, said branches being connected to the inlet of the turbine and each carrying proportional valve means (74, 76), and the circulation of the compressed air in these branches during transient operating phases according to strategies applied audits means of winnowing, and determined according to the characteristics of the stabilized phases.
    公开号:FR3035444A1
    申请号:FR1553583
    申请日:2015-04-22
    公开日:2016-10-28
    发明作者:Olivier Baudrand；Thierry Colliou；Jean-Marc Zaccardi
    申请人:IFP Energies Nouvelles IFPEN；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method of controlling a device for introducing the quantity of air at the intake of a supercharged internal combustion engine, in particular a stationary engine or for a motor vehicle or industrial vehicle. .
    [0002] As is widely known, the power delivered by an internal combustion engine is dependent on the amount of air introduced into the combustion chamber of the engine, amount of air which is itself proportional to the density of this air.
    [0003] Thus, it is usual to increase this amount of air by means of compression of the outside air before it is admitted into this combustion chamber. This operation, called supercharging, can be carried out by any means, such as a turbocharger or a driven compressor, which can be centrifugal or volumetric.
    [0004] In the case of supercharging by a turbocharger, the latter comprises a rotary turbine, single flow or double flow, connected by an axis to a rotary compressor. The exhaust gases from the engine pass through the turbine which is then rotated. This rotation is then transmitted to the compressor which, by its rotation, compresses the outside air before it is introduced into the combustion chamber. As is better described in the French patent application No. 2,478,736, it is provided, in order to significantly increase this amount of compressed air in the engine combustion chamber, to further increase the compression of the engine. outside air by the compressor.
    [0005] This is done more particularly by increasing the speed of rotation of the turbine and therefore of the compressor. For this, a portion of the compressed air leaving the compressor is diverted to be admitted directly to the inlet of the turbine by mixing with the exhaust gas. This turbine is then traversed by a larger amount of fluid (mixture of compressed air and exhaust gas), which increases the speed of rotation of the turbine and consequently the compressor. This increase in compressor speed thus makes it possible to increase the pressure of the outside air which will be compressed in this compressor and then introduced into the combustion chamber of the engine. By this, the compressed air has a higher density which allows to increase the amount of air contained in the combustion chamber.
    [0006] This type of supercharged engine, although satisfactory, nevertheless has significant disadvantages. Indeed, the flow of compressed air that is admitted to the inlet of the turbine is not properly controlled, which can cause a malfunction of the engine. Thus, by way of example, in the event of too much compressed air being diverted to the inlet of the turbine, the exhaust gases entering the turbine are cooled too much by this air and leads to a decrease. overall performance of overfeeding. The present invention proposes to overcome the disadvantages mentioned above by means of a method of controlling a device for introducing a quantity of air at the intake of a supercharged internal combustion engine which makes it possible to respond to to all engine power demands, and especially in the transient operating phases. The present invention makes it possible to manage and carry out a transfer of the compressed air from the intake to the exhaust even when the average pressure of the compressed air at the intake is lower than that of the exhaust gases. . It only suffices that there are phases during the operating cycle of the engine where the intake pressure is higher than that existing at the exhaust. Thus, the present invention relates to a method for controlling the amount of air introduced to the intake of a supercharged internal combustion engine, said engine comprising two exhaust gas outlets each connected to an exhaust manifold. a group of at least one cylinder, comprising a supercharging device comprising a turbocharger with a double inlet turbine connected to said exhaust gas outlets as well as an outdoor air compressor, and a partial transfer duct compressed air from the compressor to the turbine inlets, characterized in that two branches are arranged in said partial transfer duct, said branches being connected to the turbine inlet and each carrying proportional valve means, and in 3035444 3 what is controlled the circulation of compressed air in these branches during phases of transient operation according to strategies applied audits winnowing means, and determined according to the characteristics of the stabilized phases.
    [0007] In addition, a check valve can be provided on each of the branches. The branches can be connected by a connecting line. The connecting line may carry means of winnowing.
    [0008] The compressed air flowing in the transfer duct can be heated. For a control strategy, the following steps can be performed: from an adjustment state of opening of the valve means for an initial stabilized state, the adjustment is reduced according to a determined gradient, up to a value maintained a time t, - said adjustment is increased according to a determined gradient to reach the opening setting of the valve means for a final stabilized state.
    [0009] The initial state can be low load and the final state high load. The opening adjustment states of the valve means for the initial and final stabilized states may be identical.
    [0010] The other features and advantages of the invention will appear on reading the following description, which is given solely by way of illustration and is not restrictive, and to which are appended: FIG. 1 which illustrates an internal combustion engine with its supercharging device used according to the invention; - Figure 2 shows a variant of the internal combustion engine with its supercharging device; FIG. 3 which illustrates a variant of the internal combustion engine with its supercharging device according to FIG. 1; FIGS. 4 to 10 show examples of a strategy for managing winnowing means; Figures 11 and 12 show examples of operation of a GMP according to the application of the present invention. In Figure 1, the internal combustion engine 10 comprises at least two cylinders, here four cylinders referenced 121 to 124 from the left of the figure.
    [0011] Preferably, this engine is a direct injection internal combustion engine, especially diesel type, but this does not in any way discard any other type of internal combustion engine. Each cylinder comprises intake means 14 with at least one intake valve 16, here two intake valves each controlling an intake manifold 18. The intake manifolds 18 terminate at an intake manifold 20 supplied with fuel. by a supply duct 22 for intake air, such as compressed air. This cylinder also comprises exhaust gas exhaust means 24 with at least one exhaust valve 26, here also two valves 20 each controlling an exhaust manifold 28. In the example illustrated, the engine is designed to operate in accordance with a combustion order referred to as 1-3-4-2. Given this combustion order, the exhaust pipes of the first cylinder 121 and the second cylinder 124, which form a first group of at least one cylinder, are connected to a first exhaust manifold 30 with a first outlet of exhaust gas 32. The third and fourth exhaust manifolds 122 and 123, which form a second group of at least one cylinder, are connected to a second exhaust manifold 34 which has a second exhaust gas outlet. exhaust 36. The two exhaust outlets result in a turbocharger 38 for the compression of air and more particularly to the expansion turbine 40 of this turbocharger.
    [0012] As shown in FIG. 1, the turbocharger is a double-inlet turbocharger, better known as a "Twin Scroll" turbocharger. This type of turbocharger comprises the exhaust gas turbine 40 which is connected in rotation by a shaft 42 with a compressor 44. At the turbine, the exhaust gas inlet is divided into two parts. two sections, a first inlet section 46 connected to the first exhaust gas outlet 32 of the first manifold 30 and a second inlet section 48 connected to the second exhaust gas outlet 36 of the second manifold 10 of Exhaust 34. The exhaust gas 50 of the turbine 40 is conventionally connected to the exhaust line 52 of the engine. The compressor 44 of the turbocharger 38 has an external air intake 54 supplied by a supply line 56. The compressed air outlet 58 of this compressor is connected to the feed duct 22 of the intake manifold 20 by a 60. Advantageously, it can be provided to place a cooling radiator of the compressed air 62 on the pipe 60, between the compressor and the pipe 22.
    [0013] As best seen in Figure 1, a transfer conduit 64 circulates a portion of the compressed air exiting the compressor 44 to the inlets 46 and 48 of the turbine. More precisely, this partial transfer duct originates on the duct 60, at a point of intersection 66 between the compressor and the cooling radiator 62, and then separates, starting from a junction point 68, into two branches 70 and 72. The branch 70 leads to the inlet 46 of the turbine by its junction with the first exhaust outlet 32 and the branch 72 leads to the other inlet 48 of the turbine by its junction with the exhaust outlet 36.
    [0014] Each branch carries valve means 74 and 76, such as a proportional valve, controlled by a control means 78, which may be common to both valve means. Each of the proportional valves thus makes it possible to control the flow rate of the circulation of compressed air circulating in each of the branches 70 and 72. Advantageously, each branch also comprises a non-return valve 80 and 82 which prohibits the circulation of the compressed air from the branch to the compressor 5 while preventing the communication of the two branches. This configuration thus makes it possible, during the operation of the engine, to take advantage of the zones of low exhaust pressure occurring occasionally in the exhaust manifolds to introduce compressed air into the turbine and thus to increase the flow rate of this turbine and consequently of the compressor . This also makes it possible to have a more efficient supercharging for the low speeds and in particular to manage the transient phases with adapted proportional valve control strategies. During operation, if large quantities of air are required in the cylinders, the valves 74 and 76 are open-controlled to introduce compressed air from the compressor 44 into the turbine 40. compressor 44 circulates in the conduit 64 and in the branches 70 and 72 to reach the exhaust gas inlets 46 and 48 of the turbine 40 by providing a surplus of fluid to the turbine.
    [0015] Thus, the turbine is traversed not only by the exhaust gas from the outlets 32 and 36, but also by compressed air which is added to these gases. As a result, the rotation of the turbine is increased, which causes an increase in the rotation of the compressor and, consequently, an increase in the pressure of the compressed air coming out of this compressor.
    [0016] The valves 74 and 76 are controlled by the control means 78 so as to admit the amount of compressed air into the turbine according to the supercharging requirements of the engine, and in particular during the transient phases between two stabilized operating phases. The variant of FIG. 2 is distinguished from FIG. 1 by the provision of a connecting pipe 84 between the two branches 70 and 72. This pipe is provided with valve means 86, such as a proportional valve, which, here, is also controlled by the control means 78.
    [0017] One of the ends of this pipe is connected to the branch 70 at a point situated between the valve 74 and the exhaust gas outlet 32 and the other of the ends at a point situated between the valve 76 and the outlet This conduit controls the fluid communication between the two branches arriving at the turbine. More precisely, this connecting pipe makes it possible to deflect a part of the compressed air circulating in one of the branches to introduce it into the other of the branches by mixing with the exhaust gases at the inlet of the turbine 40.
    [0018] In addition, the connecting line makes it possible to reduce the differential pressure of the exhaust gas (or pulsating exhaust) of the other branch on one branch of the turbine which is angularly offset in the combustion cycle of the engine. In FIG. 3, which essentially comprises the same elements as those of FIG. 1, the compressed air leaving the compressor 44 and flowing in the transfer duct 64 is heated before being introduced into the turbine 40. For this, the transfer duct 64 carries a heating means 88 for compressed air, here a heat exchanger in the form of a heating radiator, placed between the point of intersection 66 and the point of junction 68 that includes this conduit. This radiator is traversed by the compressed air flowing in this conduit while being traversed by the engine exhaust gas. These exhaust gases come from the outlet 50 of the turbine and are fed through a pipe 90 to the inlet 92 of the radiator. The exhaust gas travels through this radiator by transferring the heat they contain to the compressed air and then emerges from this radiator through the outlet 94 to be directed to the exhaust line of the engine. Thus, a portion of the energy of the exhaust gas is recovered by the compressed air which is introduced into the turbine by one or other of the inputs 46 and 48. This heated compressed air thus makes it possible to provide additional energy to the turbine which, as a result, will run at a higher speed. This high rotational speed is then transmitted to the compressor which will realize a higher compression of the outside air.
    [0019] The present invention is particularly suitable for managing the phases of transient operation between two stabilized operating phases. "Stabilized operation" is understood to mean a state in which all the actuators of the engine are not modified, for example, when the quantities of fuel injected are constant over time, the EGR rate remains constant, the actuator turbocharger is in the same position, etc. Conversely, "transient operation" is understood to mean the phase during which certain actuators are activated in response to a change in the power demand of the user. For example, the case of a "load taking" during which the user is going to ask the motor to go from a weakly charged state (little torque, little power) to a highly charged state can be described ( strong torque, strong power). This load can be achieved either at constant engine speed, or with a simultaneous increase in load and speed. One can also consider the example of a "foot lift", that is to say a more or less abrupt decrease in the torque demand. In each of these cases, the actuators of the engine must be controlled in order to ensure optimal operation of the powertrain (GMP). The present improvement consists in optimizing the dynamics of the engine during transient operation by controlling the opening and closing of the proportional throttling means allowing the passage of the gases from the partial compressed air transfer duct towards the turbine inlet. 40. In general, these transient phases can be defined as transition phases between two stabilized states for which the level of sweeping, enabled by the proportional valves 74 and 76, is stabilized and optimal from the point of view of engine performance. expected on each of these operating points. The optimum control of the means of unlocking the partial transfer loop consists in applying a determined strategy of the evolution of the closing or opening path of the valve means in order to pass from a stabilized state to another stabilized state. under optimized conditions.
    [0020] FIG. 4 schematically illustrates this transition situation between the points A, representative of the stabilized point (Si) before the transient phase, and B, representative of the stabilized point (S2) after the transient phase (T). The point A may correspond to for example at the beginning of a load taking, and the point B at the instant from which the desired torque is reached. This can also illustrate a decrease in charge between A and B. The transitional phase will be represented in the following figures which describe examples of several strategies to optimally manage the transition between the two stabilized states A and B. On the 4, "100%" and "0%" respectively indicate the opening and the complete closing of the passage of the gases in the throttling means 74 and 76 (V) as a function of time (in seconds). According to the invention, the transient phase management method consists in applying determined strategies comprising at least one opening (and / or closing) sequence of the proportional valves to obtain optimized operation of the compressor 44 mu by the turbine 40 to move from one stabilized state to another. Figures 5 to 10 illustrate different examples of management of the scanning level during the transient phase. By "sweep level" is meant here the amounts of gas introduced by the compressed air partial transfer line 64 into the turbine inlets. FIG. 5 corresponds to the case of a "sweep" cut off suddenly at the beginning of the transitional phase at A to position it on the setting corresponding to the stabilized operating point B. It is noted that to cut the "sweep" 25 suddenly does not mean that the motor reaches its second stabilized operating point B right away. Figure 6 corresponds to the case of a "scan" cut in a progressive manner, substantially linear or not, during the transient phase.
    [0021] Fig. 7 corresponds to the case of a chopped "sweep" strategy during the transient phase. Several sequences of opening and closing of the proportional valves are made here between the positions of the means for storing the stabilized phases A and B. FIG. 8 corresponds to the case of a "sweep" cut off progressively by bearing retainers. during the transitional phase. The choice of the optimal method for managing the proportional valves during the transient phase essentially depends on the characteristics of the starting stabilized operating point (point A) and those of the targeted stabilized operating point (point B). In other words, the winch control strategy must be optimized to best match the characteristics of the operating points of the engine (load, speed, flow, richness, time spent on each operating point, etc.) and over-charging (rotation, pumping, etc.).
    [0022] An example of the case of load taking, that is to say of a rapid increase in the demand for power to the motor, can be described as an example. For this example, we consider a case of transient operation in three main phases: - phase 1: engine stabilized on a point of operation at low load; Phase 2: transient charging; - phase 3: motor stabilized at a high load operating point (higher load than the first "low" load phase). It is considered that the "scan" is active on both the first low-load operation point (first phase), and on the second high-load operation point with a level which may be different from that of the first phase. according to the needs of the engine specific to this level of charge. It is also envisaged to allow the scanning during the transient, at varying levels, according to the examples illustrated above.
    [0023] Figure 9 schematically illustrates the load handler case with simplified scanning management. At first, the scanning is first progressively cut at the beginning of the transient (trajectory A-A1), then a level is maintained at a certain level of "scanning" during a transient (trajectory Ai-A2), and we gradually increase the "sweep" at the end of the transient (trajectory A2-A3).
    [0024] FIG. 10 illustrates the example in which the two stabilized phases are operated at the same level of "sweeping", that is, at the same settings of the proportional valves. It is considered that only the level of closure during the transient can be modified. This strategy is based on four parameters: the cut-off time of the scan (t1), the cut-off time (ie the time spent scanning reduced or forbidden, t2), the restart delay of the scan (t3) and the " level "cutoff. The achievements show that there is a compromise to be found between: - a quick restart of the "sweep" which can lead to a "hole" of 15 torque (related to the intake / exhaust pressure balances, the residual gas rate in the combustion chamber, etc.); - a prolonged shutdown of the "sweeping" system, which can lead to a decrease in the turbine rotation speed, which can then affect the whole dynamics when the "sweeping" is again authorized.
    [0025] An optimal strategy identified hitherto consists in: - cutting off the sweep very rapidly at the beginning of the transient phase in order to obtain a rapid rise in the load. Indeed, since the operating point at "low load" allows sweeping, the engine has a good margin of wealth to enrich the mixture quickly and increase load (but not emit fumes); - Then to partially cut the sweep shortly (about 0.2 to 0.3 seconds on the simulated cases) not to collapse the rotational speed of the turbine (a partial cutoff allows a priori to maintain a flow rate and maintain the turbine speed during the transitional phase); 30 - and finally to restart the sweep "gently" to avoid showing "hole" torque.
    [0026] This optimal strategy as well as other simulated cases are illustrated in Figure 11. The "RSS" curve corresponds to the reference operation "Simple Reference Supercharging". The "RDS" curve corresponds to a case of "double supercharging reference", an asymptotic case mentioned in this figure only for information purposes, the scanning system allowing a priori a single supercharging engine to gain in performance without however reaching those of a double turbocharged engine. The other curves correspond to a motor with a simple supercharging equipped with a partial system of compressed air transfer or so-called "sweeping", according to the invention. The "RBE" curve (for External Scanning Reference) corresponds to the case allowing continuous scanning, that is to say, on the point of low load, during the transient phase, and on the point of high load. The curve "1RBE - OFF 0.01 - STAB 2.0 - ON 0.01" corresponds to a case where the scan cut-off time is 0.01 seconds, the scan blanking time is 2.0 seconds, and the restart delay. of the scan is 0.01 seconds. It is noted on this case that a "hole" of torque appears when restarting the scan because it was stopped too long. The "2RBE - OFF 0.01 - STAB 0.3 - ON 0.2" curve finally corresponds to an optimal case where the scan cut-off time is 0.01 seconds, the sweep inhibit time is 0.2 seconds, and the delivery time is 0.2 seconds. en route scanning is 0.2 seconds. As can be seen in this figure, this scan control strategy provides a fast rise in load. FIG. 12 illustrates the evolution of the speed of the turbine 40. In particular, the slight fall in speed corresponding to the case which forbids sweeping for too long is observed. As indicated above, the optimal control strategy varies from one engine to another, therefore the values of the various control parameters indicated here are provided for guidance only.
    权利要求:
    Claims (8)
    [0001]
    CLAIMS1) A method for controlling the amount of air introduced to the intake of a supercharged internal combustion engine, said engine comprising two exhaust gas outlets (32, 36) each connected to an exhaust manifold (30). , 34) of a group of at least one cylinder (121, 122, 123, 124), comprising a supercharging device (38) having a turbocharger with a dual input turbine (40) (46, 48 connected to said outlets exhaust gas system and an external air compressor (44), and a partial transfer duct (64) of compressed air from the compressor to the turbine inlet, characterized in that two branches (70, 72) to said partial transfer duct, said branches being connected to the inlet of the turbine and each carrying proportional valve means (74, 76), and in that the circulation of the compressed air is controlled in these branches during transient operating phases e according to strategies applied audits means of winnowing, and determined according to the characteristics of the stabilized phases.
    [0002]
    2) Method according to claim 1, characterized in that one further has a check valve (80, 82) on each of the branches.
    [0003]
    3) Method according to claim 1 or 2, characterized in that the branches (70; 72) are connected by a connecting pipe (84).
    [0004]
    4) Method according to claim 3, characterized in that the connecting pipe carries valve means (86).
    [0005]
    5) Method according to claim 1, characterized in that one heats the compressed air flowing in the transfer conduit (64).
    [0006]
    6) Method according to one of claims 1 to 5, wherein for a control strategy, the following steps are performed: - from an opening adjustment state of the valve means for an initial stabilized state - the adjustment is reduced according to a determined gradient, up to a value maintained a time t, 5 - said adjustment is increased according to a determined gradient to reach the opening setting of the valve means for a final stabilized state.
    [0007]
    7) Method according to claim 6, wherein the initial state is low load and the final state high load.
    [0008]
    8) Method according to one of claims 6 or 7, wherein the opening adjustment states of the valve means for the initial and final stabilized states are identical. 10
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1553583A|FR3035444B1|2015-04-22|2015-04-22|METHOD OF CONTROLLING THE QUANTITY OF AIR INTRODUCED AT THE ADMISSION OF A SUPERIOR INTERNAL COMBUSTION ENGINE|
    FR1553583|2015-04-22|FR1553583A| FR3035444B1|2015-04-22|2015-04-22|METHOD OF CONTROLLING THE QUANTITY OF AIR INTRODUCED AT THE ADMISSION OF A SUPERIOR INTERNAL COMBUSTION ENGINE|
    EP16719262.4A| EP3286418A1|2015-04-22|2016-04-12|Method for controlling the amount of air fed into the intake of a supercharged internal combustion engine|
    PCT/EP2016/057986| WO2016169805A1|2015-04-22|2016-04-12|Method for controlling the amount of air fed into the intake of a supercharged internal combustion engine|
    CN201680023142.7A| CN107532503A|2015-04-22|2016-04-12|The method that control is fed to the air capacity in the air inlet of boosting internal combustion engine|
    US15/568,176| US10619559B2|2015-04-22|2016-04-12|Method of controlling the amount of air fed into the intake of a supercharged internal combustion engine|
    JP2017554012A| JP2018513939A|2015-04-22|2016-04-12|A method for controlling the amount of air supplied to an intake port of a supercharged internal combustion engine.|
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