• 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:
    Device for regulating the richness (R) of the air-fuel mixture in an internal combustion engine with ignition and injection controlled by a computer, comprising a catalyst. The device comprises a first servo loop for regulating the richness (Rλ) around a richness setpoint (Cλ). The main characteristic of the invention is that the richness setpoint (Cλ) of the first loop is permanently controlled by regulating the amount of oxygen stored (OS) in the catalyst around a setpoint (OSc).
    公开号:FR3033364A1
    申请号:FR1551774
    申请日:2015-03-03
    公开日:2016-09-09
    发明作者:Guillaume Chabard；Vincent Hoarau；Aymeric Walrave
    申请人:Renault SAS；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The invention relates to a method for regulating the richness of an internal combustion engine and an associated regulation device. BACKGROUND OF THE INVENTION It finds an advantageous application in a motor vehicle equipped with a spark ignition engine.
    [0002] STATE OF THE ART In an internal combustion engine, the regulation of the richness, that is to say the regulation of the ratio between the quantity of fuel injected and the amount of air admitted into the engine, reduced to the stoichiometric proportions , is intended to enslave the richness of the mixture to a setpoint richness that can be variable depending on the operating conditions of the engine, including the speed and load. In addition, to comply with increasingly strict antipollution standards that aim to reduce the levels of emissions into the atmosphere of the pollutant gases resulting from the combustion of the air-fuel mixture, it is necessary to achieve a fine control of this wealth of mixture to maximize the efficiency of the engine mounted exhaust treatment devices. In the case of a spark-ignition engine, typically a gasoline-type engine, ignition and fuel injection are electronically controlled by an engine computer to operate most often at odds of 1 that is to say in a stoichiometric mixture, according to which the quantity of oxygen contained in the air-fuel mixture is exactly equal to the quantity theoretically necessary for the fuel to be entirely consumed.
    [0003] A three-way catalyst is generally fitted to the engine exhaust to provide exhaust gas treatment. In known manner, such a catalyst makes it possible to oxidize at least a portion of the unburned hydrocarbons (HC) and carbon monoxide (CO), and to reduce at least a portion of the nitrogen oxides (NO) that are emitted in the combustion gas from the engine. The efficiency of the catalyst can be defined as the performance of the gas pollutants treatment reaction (HC, CO, NON). Several methods and devices for controlling the richness are known which aim to improve the efficiency of a catalyst. A well-known example of a wealth control method is associated with a device comprising a simple control loop which comprises an oxygen sensor, or lambda probe, mounted upstream of the catalyst (in the direction of circulation of the gases). 'exhaust). The output signal, which is generally a voltage, is representative of the richness of the mixture, is subtracted from a target voltage, for example of the order of 450 mV which corresponds to a value of richness equal to 1. The signal of The error, equal to the difference between the setpoint voltage and the measured voltage, is then compared to zero in a binary comparator. When the setpoint voltage is higher than the output voltage of the probe, the air - fuel mixture is enriched by a regulator, generally of the proportional - integral (PI) type, which receives as input the error signal and provides in An injection timing correction is added to add to the basic fuel injection duration, to determine the fuel injection time to be applied in order to obtain the richness of the mixture to be injected into the engine. The basic injection duration is increased by a term proportional to the error and an integral term. Conversely, when the setpoint voltage is lower than the output voltage of the probe, the air-fuel mixture is depleted by the same regulator by reducing the injection time of a proportional term and an integral term. . Such a method can be advantageously implemented using a binary type oxygen probe. The richness of the mixture resulting from the beat of the injection time oscillates around the stoichiometric value with an alternation of rich and poor cycles, having an amplitude and a frequency which depend on the values of the proportional and integral terms. Numerous processes and wealth control devices are also known which aim at perfecting the richness adjustment obtained by such a simple loop, in particular to increase the efficiency of the NOx treatment which can be degraded during certain operating conditions of the system. engine. For example, FR-A1-2833309 discloses a method of regulating the richness associated with a double servo-control loop which comprises a first oxygen sensor mounted upstream of the catalyst and a second oxygen sensor mounted downstream. catalyst. The wealth upstream of the catalyst is regulated in a closed loop by a PI regulator according to a first richness guideline. This regulator delivers, as in the case of the simple loop which has been exposed above, an injection time correction to be added to a basic injection duration. But here, the first richness setpoint of this loop is permanently controlled by the wealth control determined from the exhaust gas downstream of the catalytic converter, by a second control loop which comprises a second lambda probe downstream. catalyst and a wealth control device calculated from the downstream probe according to a second wealth guideline.
    [0004] However, the known double-loop loop richness control methods still do not make it possible to optimally treat the pollutants and more particularly the nitrogen oxides, since they do not make it possible to adjust the quantity of oxygen (OS) stored in the catalyst, the downstream lambda probe not representing the exact oxygen storage state of the catalyst and not having a behavior adapted to a PI regulator. However, it is the value of the oxygen stock present in real time in the catalyst which is decisive for the catalyst yield. SUMMARY OF THE INVENTION The invention proposes to remedy the defects of known wealth control methods and devices. More precisely, it aims to anticipate the oxygen storage state in the catalyst by modeling it in order to adapt the richness upstream of the calculator, rather than react by correcting said richness from the state of the downstream gases. catalyst. More specifically, it proposes a method of regulating the richness of the air-fuel mixture in an internal combustion engine with ignition and injection controlled by a computer and associated with an exhaust catalyst, said process comprising: A step during from which the richness of the mixture admitted into the engine is determined from an upstream proportional oxygen sensor of the catalyst; A step during which the richness calculated from said upstream probe is controlled according to a richness setpoint, and the correction to be added is added to a basic injection duration to determine the injection duration of 3033364-4. - Fuel to be applied to obtain the richness of the mixture to be injected into the engine, said method being characterized in that it further comprises at least: a step of calculating the amount of oxygen stored in the catalyst; A step of determining an oxygen stock setpoint from the oxygen storage capacity of the catalyst; and, a step of regulating said quantity of oxygen stored according to said oxygen stock setpoint, which delivers, as a function of the stored oxygen quantity difference, the wealth setpoint correction to be added to a setpoint of stoichiometric basic wealth to determine the wealth guideline. It also proposes a device for regulating the richness of the air-fuel mixture in an internal combustion engine with ignition and injection controlled by a computer, comprising a catalyst, comprising a first servocontrol loop comprising: A first proportional oxygen probe measuring the oxygen concentration of the engine exhaust gas upstream of the catalyst, from which the computer determines the richness of the mixture admitted into the engine; A first richness regulator calculated from said upstream probe according to a richness directive, which delivers the correction to be added to a basic injection duration via a first adder, to determine the duration of fuel injection to be applied in order to obtain the richness of the mixture to be injected into the engine, 25, said device being characterized in that the richness setpoint of the first servocontrol loop is permanently controlled by the regulation of the quantity of fuel. oxygen stored in the catalyst by a second servo loop comprising: means for calculating said amount of oxygen stored in the catalyst; Means for determining an oxygen stock setpoint from the oxygen storage capacity of the catalyst; and a second regulator for regulating said quantity of oxygen stored according to said oxygen stock setpoint, which delivers, as a function of the stored oxygen quantity difference, the wealth setpoint correction to be added to 35 a stoichiometric basic richness guideline via a second adder, to determine the richness setpoint. BRIEF DESCRIPTION OF THE FIGURES Other features and advantages of the invention will become apparent on reading a nonlimiting embodiment thereof, with reference to the accompanying drawings in which: FIG. 1 schematically represents a treatment device exhaust from an engine associated with an exhaust line equipped with a catalyst; FIG. 2 represents a device for regulating the richness according to the invention; FIG. 3 represents a richness setpoint map as a function of the difference between the quantity of oxygen stored in the catalyst and an oxygen stock setpoint; FIG. 4 represents a transfer function of an oxygen quantity regulator stored in the catalyst according to the invention, which specifies the correction of the setpoint of richness to be made as a function of the stored oxygen quantity error; and, Figure 5 is a flowchart of the steps of a wealth control method according to the invention. DETAILED DESCRIPTION OF THE FIGURES FIG. 1 shows a device 1 for treating the exhaust gases G of an internal combustion engine 2, in particular a motor vehicle engine. Engine 2 is a spark ignition engine with direct or indirect injection. Without limitation, it can be naturally aspirated or supercharged type. It may also have other features, such as for example be associated with at least one partial recirculation circuit of the exhaust gas at the inlet, without harming the generality of the invention. An exhaust line 3 allows the evacuation of G gases from the engine to the outside atmosphere. A post-treatment device for purifying the exhaust gases G is interposed in line 3. It mainly comprises a catalyst 3 of the three-way type. The catalyst makes it possible to treat several polluting substances such as nitrogen oxides (N0x), unburned hydrocarbons (HC) and carbon oxides (CO) present in the combustion gases of the engine 2. To reduce the discharge of pollutants into the outside atmosphere, a process for regulating the air-fuel mixture is used in a known manner. An electronic control system 5 or calculator 5 makes it possible to determine the quantity of Qcarb fuel to be injected into the engine so that the richness of the mixture is as close as possible to a given richness. It is also possible for the calculator 5 to determine the injection time t1 of the fuel which corresponds to the quantity of fuel Qcarb injected. For this, it is necessary to provide the computer 5 information and parameters such as the pressure in the intake manifold of the engine 2, the speed of the engine 2 and information representative of the richness of the air fuel mixture.
    [0005] Thus, the computer is connected, in FIG. 1, to a pressure sensor 6 which makes it possible to determine a value of the pressure prevailing in the intake manifold of the engine 2, to a sensor 7 making it possible to determine the number of passes in the point high death of one of the pistons of the engine 2, and a first oxygen sensor 8 mounted upstream of the catalyst 4. For the implementation of the method 20 according to the invention, the upstream sensor 8 is of the proportional type. It provides information, usually a voltage signal, which is representative of the richness of the mixture and makes it possible to determine its value. For the implementation of the method according to the invention also, the computer is further connected to a second oxygen sensor 9 mounted downstream of the catalyst 4.
    [0006] This downstream probe 9 may be of the binary type, that is to say providing an output signal which only makes it possible to know the rich or poor state of the mixture. With reference to FIG. 2, the wealth control device for carrying out the process according to the invention is now described in greater detail. The regulating device comprises a simple servocontrol loop, comprising the proportional type upstream probe 8, intended for measuring the oxygen concentration of the exhaust gases of the engine 2, upstream of the catalyst 4, measured from which calculator 5 determines the real wealth of the air-fuel mixture ignited in the engine cylinders. This upstream probe 8 delivers a voltage signal U ,, corresponding to a richness R ,,. This richness R ,, is compared with a set point C ,, in a comparator 10 which delivers the difference ei between the estimated RA richness from the measured voltage UA, and the setpoint of wealth AC to be followed. This simple loop also comprises a richness regulator 11, for example of proportional-integral type (PI), which receives as input the value of the difference ei and which outputs the correction T, to be added to a duration of 5 d injection t, basic (which corresponds to the stoichiometric richness) through an adder 12, to determine the injection time T, fuel to be applied in order to obtain the richness of the air-fuel mixture to inject in the engine 2. According to the invention, the wealth control device further comprises a second control loop comprising: the upstream sensor 8; calculation means 13 for the amount of oxygen stored in the catalyst 4 OS 4; means 14 for determining the oxygen storage capacity OSC of the catalyst and an oxygen storage setpoint OS, from this OSC storage capacity; a second comparator 15; a second regulator 16 which is a regulator of the amount of stored oxygen OS; a second adder 17.
    [0007] The setpoint of richness CA of the simple loop is delivered by the second adder 17. It adds a base setpoint, equal to 1, to a setpoint correction of richness cA which is delivered by the second regulator 16 to from the difference £ 2 between, on the one hand, the value of the quantity stored OS in the catalyst, delivered by the calculation means 13, and on the other hand, the oxygen storage setpoint OS,, delivered by the determination means 14. Said set point OS is subtracted from said stored quantity OS in the comparator 15 which delivers the difference β 2 to the second regulator 16. The second adder 17 outputs the setpoint value of the richness C, of the simple loop according to a map as shown in FIG. 3. The OS oxygen storage setpoint, and the map are precalibrated to obtain the optimal richness for the reprocessing of the pollutants. The abscissa shows the difference between the quantity of stored oxygen OS and the oxygen storage setpoint OS, that is to say the difference £ 2, and on the ordinate, the setpoint of richness C, from the second adder 17. The value of the setpoint 30 of richness C ,, is equal to 1 when the quantity of oxygen stored OS is strictly equal to the oxygen storage setpoint OS,. The value of the richness reference CA, is an increasing function of the difference £ 2. It is a function finely divided between a first negative error threshold and a second positive error threshold. However, the richness setpoint is saturated to a maximum value, for example substantially equal to 1.06 for positive differences φ2 greater than a positive error threshold, and 3033364 - 8 - for negative deviations below a threshold negative error. FIG. 4 represents, in a manner very similar to FIG. 3, the transfer function of the second regulator 16. On the abscissa there is the stored oxygen quantity error 2 which is to be regulated, as in FIG. on the ordinate there is the setpoint correction of richness cA which is delivered by the second regulator 16. In other words, the ordinate is read on the ordinate the value of the setpoint of richness CA reduced by 1 which corresponds to the basic stoichiometric richness . As a first approach, it can be seen that the regulator 16 behaves as a proportional type regulator over a range of OS £ 2 difference between a first negative difference threshold x 3 and a positive difference threshold x 4. For example, the first negative difference threshold x3 may be substantially equal to a mass of -5 g, and the positive difference threshold x4 may be substantially equal to +30 g. On the other hand, the regulator 16 saturates the setpoint correction of richness cA with a setpoint correction value of maximum richness y4 positive, for example 15 +0.06, when the difference of OS becomes greater than the threshold of positive difference x4. In the same way, the regulator 16 saturates the setpoint correction of richness cA with a value of correction of minimum richness value y1 negative, for example -0.01, when the difference of OS falls below a second negative difference threshold x1 which is less than or equal to the first negative difference threshold x3. The second threshold of negative deviation x1 may for example be substantially equal to -30 g. It can be symmetrical to the positive difference threshold x4. In another embodiment not shown, the first negative difference threshold and the second negative difference threshold may be merged. In other words, the richness setpoint correction cA is saturated at a negative constant value or at a constant positive value outside an OS2 range of difference including the value 0, and this range of The difference in OS can be centered on 0. Within said OS range where the richness setpoint correction cA is not constant, the richness setpoint correction cA is a continuous, increasing function, and refines by parts of the OS 2 gap. Said range comprises a sub-range comprising the value 0 on which the setpoint correction is proportional to the difference of OS, that is to say is a linear function of the difference of OS. In Figure 4, there is shown an affine function in three delimited portions respectively represented by the intervals [x1, x2], [x2, x3], and [x3, x4]. In an embodiment not shown, the partial affine function can comprise only one part, more precisely the sub-range comprising the value 0 on which the setpoint correction is proportional to the difference between 'BONE. Referring again to FIG. 2, a preferred embodiment is now described for calculating, by means of calculating means 13, the quantity of oxygen stored in the catalyst 4 in the catalyst 4, and for determining, by means of the determination means 14 the oxygen storage capacity OSC of the catalyst and an oxygen storage setpoint OS, from this oxygen storage capacity OSC. The oxygen storage capacity OSC can advantageously be determined regularly each time the engine 2 is started, in order to take into account the aging of the catalyst 4 over the long term and any failures. The engine computer 5 can in particular cause a transition from a lean operating mode to a rich operating mode of the engine 2. In a first step, the operation of the engine with a zero richness corresponding to an injection cutoff makes saturate the catalyst 4 in oxygen. The approach of the OSC oxygen storage capacity, for example 90% of this oxygen storage capacity OSC, is indicated by the fact that the downstream probe 9 starts to switch to an exceptionally low voltage level Umin, for example lower at 150 mV.
    [0008] At this point the following equation can be considered: (Equ.1) OS = a .0SC with a 0.9 In other words, the tilting of the probe detects a saturation start of the catalyst ( for example 90% of the total saturation according to bench tests by weighing), that is to say a percentage of high CSO close to 90%. The computer 5 then immediately applies a level of richness greater than 1 during the resumption after injection cutoff, so as to let the catalyst 4 gradually empty its oxygen, until the downstream probe 9 observes that the 30 stored oxygen mass approaches zero, by switching to an exceptionally high Umax voltage level, for example greater than 870 mV. At this time, the OS still actually reaches about 40% of the oxygen storage capacity, as accurate metrological weighing tests have shown. We can consider that the following equation is verified: OS = [3 * OSC with [3 ge 0.4 In other words, the tilting of the probe makes it possible here to detect a beginning of catalyst emptying, corresponding to a still significant percentage, equal to 40% of the OSC, but not the complete emptying. By complete emptying is meant that the amount of oxygen stored OS is zero. The determination means 14 can then calculate the oxygen storage capacity OSC according to the equation: (Eq.3) ([3-a) * OSC =, rot Qech (1- RA) * To2 dt, equation in which Qech refers to the flow rate of the exhaust gas, RA refers to the richness upstream of the catalyst. T02 denotes the mass ratio of oxygen in the air (approximately 0.23, ie 23%). At denotes the duration of calculation, being understood when the calculator switches the operation of the engine in rich mixture, immediately after the tilting of the downstream probe to an exceptionally low voltage, and the calculation is stopped when the probe downstream switches to an exceptionally high voltage. Finally, the determination means define the target oxygen OS storage target, from this oxygen storage capacity OSC. This is a percentage K of the oxygen storage capacity, typically around 70%. The calculation, thanks to the calculation means 13, of the amount of oxygen stored in the current catalyst OS 4 at each instant t, is done by means of the following equation: (Equ.4) OS = OSinit, rot Qech * ( 1- RA) * T02 * dt 30, equation in which Qech designates the flow rate of the exhaust gas, RA denotes the richness upstream of the catalyst T02 denotes the mass ratio of oxygen in the air (approximately 0.23 or 23 OSinit is the predetermined amount of stored oxygen at the start of the integration, which will be initialized, for example, to the value of [3]. OSC if one starts the calculation during the first switchover of the probe to an exceptionally high voltage Umax, caused to determine the OSC. At denotes the calculation time, for example between said first switch caused by the probe to an exceptionally high voltage, and the current time. It should be noted that after this first initialization of the calculation of the amount of stored oxygen OS current, no registration is theoretically necessary. However, due to possible inaccuracies in the values of the parameters (richness, flow rate) used for the calculation, it will be very advantageous to reset the value of the quantity of stored oxygen OS: to a value equal to [3 * OSC each time that we will observe a new switchover from the downstream probe 9 to an exceptionally high voltage threshold Umax; and at a value equal to α * OSC each time a new tilt of the downstream probe 9 is observed towards an exceptionally low voltage threshold Umin. In other words, the result of the integral calculation obtained by equation 4 by [3.0SC or a .0SC each time the switchover of the corresponding probe 20 occurs, and we will start again from the moment of this reset to resume the integral calculation of equation 4. This registration is necessary in practice to avoid drifts in the medium or long term in the determination of the wealth reference RA. Figure 4 shows a flowchart of the steps of the wealth control method according to the invention, in a preferred embodiment. The process starts with an initialization step 100, for example the start of the engine 2. It continues with a step 200 of determination of the oxygen storage capacity OSC of the catalyst 200, thanks to the determination means 14 and to the method transition partner operating mode poor to rich by the computer 5, which has been explained above, based on the equation 3. It then continues with a step 300 of determination of an OS oxygen stock setpoint, as a percentage K of the OSC (eg 70%). The succession of the following process steps repeats iteratively as long as the engine is running: In step 400, the voltage U ,, of the upstream probe 8, which is a proportional probe, is measured. where one derives a corresponding upstream wealth RA. At a step 500, the voltage of the downstream probe 9, which is preferably a proportional probe, is measured. This voltage will be used to calculate the amount of oxygen stored OS either by modeling the integral calculation according to equation Equ.4 directly, or by resetting to the value [3.0SC or by a * OSC as explained above. More precisely: in the next step 600, the voltage voltage of the downstream probe 9 is compared with an exceptionally high voltage threshold Umax, for example 870 mV. If said threshold is exceeded, the method is directed to a step 700 in which the value of the stored oxygen amount OS is taken as value equal to [3.0SC. In the opposite case, the method points to a second test step 800 in which the voltage voltage of the downstream probe 9 is compared with an exceptionally low voltage threshold Urnii, for example 150 mV. If said threshold is crossed, that is to say if the voltage falls below the threshold, the process is directed to a step 900 in which the value of the stored oxygen amount OS is taken to be the value a * OSC. In the opposite case, the process is directed to step 1000 in which the value of the quantity of oxygen stored in the equation Equ.4 is calculated by calculation means 13, according to the associated method which has been exposed. upper. The method continues with a step 1100 for determining the oxygen quantity difference 2 2, which is equal to the difference between the current amount of stored oxygen OS at each instant t and the oxygen storage setpoint OS ,. The method then comprises a step 1200 for determining the setpoint correction of richness c ,, by closed-loop regulation of the quantity of oxygen stored around its OS setpoint OS, by means of the second regulator 16, by using the mapping. of FIG. 2, then of the determination of the richness setpoint C ,, by the second adder 17. The method also comprises a conventional step 1300 for determining a correction of the injection time ti and of the injection time Ti by closed-loop regulation of the upstream wealth RA around the setpoint C ,,, thanks to the first regulator 11. The process ends with an end step 1400 when the engine is stopped. It will be understood from the foregoing that in contrast to known richness control methods, the downstream voltage U ', delivered by the downstream probe in the second existing servocontrol loop of the process, is not used here. to permanently enslave the upstream wealth, but only to determine once and for all at the start of the engine the OSC oxygen storage capacity of the catalyst 4, and to occasionally correct the drifts or inaccuracies of the model of calculation of the quantity of Oxygen stored OS related to the measurement of different parameters.
    权利要求:
    Claims (13)
    [0001]
    REVENDICATIONS1. Device for regulating the richness (RA) of the air-fuel mixture in an engine (2) with internal combustion, ignition and injection controlled by a computer (5), comprising a catalyst (4), comprising a first servo-control loop comprising: a first proportional oxygen sensor (8) for measuring the oxygen concentration of the engine exhaust gases (2) upstream of the catalyst (4), from which the calculator determines the richness of the mixture admitted into the engine; a first regulator (11) of the calculated richness (RA) from said upstream probe (8) according to a setpoint (CA) of richness, which delivers the correction (Te) to be added to the injection duration (ti) of a first adder (12) to determine the injection time (Ti) of the fuel to be applied in order to obtain the richness of the mixture to be injected into the engine (2), CHARACTERIZED IN THAT setpoint (CA) of richness of the first servocontrol loop is permanently controlled to the regulation of the amount of oxygen stored (OS) in the catalyst (4) by a second servocontrol loop comprising: calculation means ( 13) of said amount of stored oxygen (OS) in the catalyst; means (14) for determining an oxygen stock setpoint (OSe) from the oxygen storage capacity (OSC) of the catalyst; and, a second regulator (16) for regulating said stored oxygen quantity (OS) according to said oxygen stock setpoint (OSe), which delivers, as a function of the oxygen quantity difference (c2) stored, the richness setpoint correction (cA) to be added to a stoichiometric basic richness setpoint through a second adder (17), to determine the richness setpoint (CA).
    [0002]
    2. Device according to claim 1, characterized in that the oxygen storage setpoint (OSe) is determined as a percentage (K) of the oxygen storage capacity (OSC) of the catalyst (4).
    [0003]
    3. Device according to claim 2, characterized in that the percentage (K) is substantially equal to 70%.
    [0004]
    4. Device according to one of claims 1 to 3, characterized in that the oxygen storage capacity (OSC) of the catalyst (4) is calculated during a transition, caused by the computer (5), d a mode of operation in lean mixture of the engine (2), capable of saturating the oxygen catalyst, to a mode of operation in rich mixture of the engine (2), able to drain the catalyst of its stock of oxygen, the beginning said saturation being evidenced by the tilting of a downstream oxygen sensor (9) of the catalyst (4) to an exceptionally low voltage level (Umin), and the beginning of said emptying being evidenced by the tilting from said downstream oxygen sensor (9) to an exceptionally high voltage level (Umax). 15
    [0005]
    5. Device according to claim 4, characterized in that the oxygen storage capacity (OSC) is determined from the flow of the exhaust gas (Q'h) of the engine and the richness (RA) from the probe upstream (8), thanks to the equation: (Eq.3) (8-a) * OSC = SAt Qech * (1- RA) * T02 * dt 20, equation in which: T02 denotes the mass ratio of oxygen in the air At denotes the computation time, between the moment when the computer switches the operation of the engine in rich mixture, immediately after the changeover of the downstream probe to an exceptionally low voltage, and the moment when the downstream probe switch to an exceptionally high voltage a denotes a constant substantially equal to 90% and [3 denotes a constant substantially equal to 40%.
    [0006]
    6. Device according to claim 5, characterized in that the amount of oxygen stored in the catalyst (OS) is calculated at each instant (t) as a function of the flow of the exhaust gas (Qech) passing through the engine (2). ) and the richness (RA) of the air - fuel mixture from the upstream probe (8), using the equation: (Eq.4) OS = OSinit + SAt Qech * (1- RA) * T02 * dt 35 , in which: T02 denotes the oxygen level in the air OSinit denotes a predetermined quantity of stored oxygen at the beginning of the calculation of the integration At denotes the computation time, between an initial instant (t0 ) corresponding to the predetermined amount of oxygen stored (OSinit) and the current instant (t).
    [0007]
    7. Device according to claim 6, characterized in that the amount of oxygen stored in the catalyst (OSinit) predetermined is set to a value equal to [3.0SC at the initial time (t0) corresponding to the tilting of the probe to downstream oxygen (9) to an exceptionally high voltage level (Umax) used to determine the value of the storage capacity (OSC).
    [0008]
    8. Device according to claim 7, characterized in that the amount of oxygen stored (OS) is reset to a value equal to [3.0SC at each subsequent tilting of the downstream oxygen sensor (9) to a voltage level exceptionally high (Umax), and at a value equal to a.OSC at each subsequent tilting of the downstream oxygen sensor (9) to an exceptionally low voltage level (Umin).
    [0009]
    9. Device according to any one of the preceding claims, characterized in that the first regulator (11) is proportional - integral type.
    [0010]
    10. Device according to any one of the preceding claims, characterized in that the second regulator (16) saturates the wealth setpoint correction (cA) at a constant value outside a range of difference (c2) of the amount of stored oxygen comprising the value 0, and applying a proportional correction to at least one sub-range of said range of deviation.
    [0011]
    11. Device according to claim 10, characterized in that on the range 25 (c2) of the stored oxygen amount within which the setpoint correction is not saturated, the richness setpoint correction. (c) is a continuous, increasing, and finite function of parts of the gap (c2).
    [0012]
    12. Device according to claim 10, characterized in that the second regulator (16) saturates the wealth setpoint correction (cA) with a negative constant value below the range of difference (c2) and with a value positive constant above the range (c2).
    [0013]
    13. A method for regulating the richness (RA) of the air-fuel mixture in an engine (2) with internal combustion, ignition and injection controlled by a computer (5), and associated with a catalyst (4) to the exhaust system, comprising: a step (400) during which the richness (RA) of the admixture admitted to the engine is determined from an upstream proportional oxygen sensor (8) of the catalyst (4); a step (1300) during which the calculated richness (RA) is controlled from said upstream probe (8) according to a setpoint (CA) of richness, and the correction (Te) to be added is added to a duration of injection (ti) base, for determining the fuel injection duration (Ti) to be applied to obtain the richness of the mixture to be injected into the engine (2) CHARACTERIZED IN THAT It further comprises at least: A step (700,900,1000) of calculating the amount of oxygen stored (OS) in the catalyst (4); a step (300) of determining an oxygen stock setpoint (OSe) from the oxygen storage capacity (OSC) of the catalyst; and, a step (1200) of regulating said stored oxygen quantity (OS) 15 according to said oxygen stock setpoint (OSe), which delivers, as a function of the difference (c2) in stored oxygen quantity the richness setpoint correction (cA) to be added to a stoichiometric baseline richness setpoint (17) to determine the wealth setpoint (CA). 20
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    同族专利:
    公开号 | 公开日
    FR3033364B1|2018-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5293740A|1991-08-29|1994-03-15|Robert Bosch Gmbh|Method and arrangement for controlling the quantity of fuel for an internal combustion engine having a catalytic converter|
    US5901552A|1996-02-23|1999-05-11|Robert Bosch Gmbh|Method of adjusting the air/fuel ratio for an internal combustion engine having a catalytic converter|
    US20020152742A1|2000-02-25|2002-10-24|Masatomo Kakuyama|Engine exhaust purification device|
    US20020121083A1|2001-01-27|2002-09-05|Omg Ag & Co. Kg|Process for operating a three-way catalyst that contains an oxygen-storage component|
    US20040040286A1|2002-08-30|2004-03-04|Giovanni Fiengo|Control of oxygen storage in a catalytic converter|
    US20080314023A1|2004-02-27|2008-12-25|Wolf-Dieter Pohmerer|Method for Determining Current Oxygen Loading of a 3-Way Catalytic Converter of a Lambda-Controlled Internal Combustion Engine|
    WO2007073997A1|2005-12-23|2007-07-05|Robert Bosch Gmbh|Lambda regulation method for a combustion engine|WO2021052808A1|2019-09-19|2021-03-25|Renault S.A.S|Method for adjusting richness in a controlled-ignition internal combustion engine|
    FR3101673A1|2019-10-07|2021-04-09|Renault S.A.S.|Method of adjusting the richness of a spark-ignition internal combustion engine|
    FR3101668A1|2019-10-07|2021-04-09|Renault S.A.S.|PROCESS FOR DIAGNOSING A POST-TREATMENT SYSTEM OF A CONTROLLED IGNITION ENGINE|
    法律状态:
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    2016-09-09| PLSC| Search report ready|Effective date: 20160909 |
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    2021-03-23| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551774A|FR3033364B1|2015-03-03|2015-03-03|DEVICE AND METHOD FOR CONTROLLING THE WEALTH OF AN INTERNAL COMBUSTION ENGINE|
    FR1551774|2015-03-03|FR1551774A| FR3033364B1|2015-03-03|2015-03-03|DEVICE AND METHOD FOR CONTROLLING THE WEALTH OF AN INTERNAL COMBUSTION ENGINE|
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