WO2023078969A1 - Procédé et système de purge d'un canister d'un moteur à combustion équipé d'au moins un circuit de recirculation des gaz d'échappement - Google Patents
Procédé et système de purge d'un canister d'un moteur à combustion équipé d'au moins un circuit de recirculation des gaz d'échappement Download PDFInfo
- Publication number
- WO2023078969A1 WO2023078969A1 PCT/EP2022/080623 EP2022080623W WO2023078969A1 WO 2023078969 A1 WO2023078969 A1 WO 2023078969A1 EP 2022080623 W EP2022080623 W EP 2022080623W WO 2023078969 A1 WO2023078969 A1 WO 2023078969A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- engine
- setpoint
- pressure
- canister
- intake
- Prior art date
Links
- 238000010926 purge Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 36
- 239000000446 fuel Substances 0.000 description 19
- 238000007906 compression Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/32—Miller cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0269—Controlling the valves to perform a Miller-Atkinson cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0402—Engine intake system parameters the parameter being determined by using a model of the engine intake or its components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
Definitions
- TITLE Process and system for purging a canister of a combustion engine equipped with at least one exhaust gas recirculation circuit
- the present invention relates to the fuel supply circuits of internal combustion engines which comprise a fuel vapor suction tank, in particular gasoline.
- the fuel vapor suction tank On a motor vehicle equipped with an internal combustion engine, more particularly a spark-ignition engine (gasoline), the fuel vapor suction tank, known by those skilled in the art by its English name “canister” , includes a carbon filter and is configured to collect fuel vapors escaping from the tank when the vehicle is stopped or when it is operating under severe conditions.
- a spark-ignition engine gasoline
- the fuel vapor suction tank known by those skilled in the art by its English name “canister” , includes a carbon filter and is configured to collect fuel vapors escaping from the tank when the vehicle is stopped or when it is operating under severe conditions.
- the canister is connected to the engine inlet by a purge pipe fitted with a valve, the opening of which controls the passage of fuel-laden vapors to the engine inlet.
- a purge pipe fitted with a valve, the opening of which controls the passage of fuel-laden vapors to the engine inlet.
- canister purge phases are carried out by opening the purge solenoid valve.
- a minimum purge flow is required to allow the evacuation of a sufficient quantity of fuel vapors in order to reduce the filling rate of the canister.
- Figure 1 represents the pressure-volume diagram and characterizes the operation of a conventional four-stroke cycle engine.
- the pumping losses correspond to the hatched area 2 which represents the work consumed by the engine, unlike the hatched area 1 which represents the work supplied by the engine.
- the stage of admission time of admission
- the stage of admission corresponds to segment AB, compression to segment BC, combustion to segment CD, the trigger to segment DE and the escapement to segment EA.
- a first method of reducing pumping losses by increasing pressure in the intake manifold, shown schematically in Figure 2 and known as the Miller cycle, is to close the intake valves before bottom dead center, with the acronym “PMB”.
- the quantity of air in the cylinder is thus admitted, not up to BDC but only up to the position of the piston corresponding to the instant of closing of the intake valve, materialized by point B in figure 2
- the throttle body is left open and the management of the amount of air admitted is effected mainly by imposing the moment of closing of the intake valves.
- the segments of the cycle BB ' and B 'B ” corresponding respectively to an increase or decrease in volume of the cylinder with the valves closed.
- the other portions of the Miller cycle are similar to those of the conventional cycle represented in figure 1.
- the segments B » C, CD, DE and EA correspond respectively to the compression, combustion, expansion and exhaust stages of the gas from an engine cylinder.
- a second method of reducing pumping losses by increasing pressure in the intake manifold is to close the intake valves after BDC.
- the intake valves remain open for part of the rise of the piston after BDC, up to point B' in figure 3.
- the air is admitted up to BDC corresponding to point B on figure 3, that is to say over the entire stroke of the piston, then part of this admitted air is then pushed back into the intake manifold when the piston rises towards top dead center, acronym "PMH", as long as the intake valves remain open.
- the amount of air admitted for combustion is therefore determined by the moment of closing of the intake valves, materialized by the point B ' in figure 3.
- the throttle body is left open and the management of the quantity of air admitted is carried out mainly by imposing the moment of closing of the intake valves.
- the other portions of the Atkinson cycle are similar to those of the conventional cycle shown in figure 1.
- the segments B ' C, CD, DE and EA correspond respectively to the compression, combustion, expansion and exhaust times gas from an engine cylinder.
- Increasing the manifold pressure reduces the amount of work consumed by the engine, so the area of hatched area 2 in Figure 3 is smaller than the corresponding area of hatched area 2 in Figure 1.
- a third method used to reduce pumping losses by increasing pressure in the intake manifold is to draw exhaust gases and send them to the intake, a process known by the acronym “EGR” for “EGR”. exhaust gas recirculation” in Anglo-Saxon terms.
- EGR exhaust gas recirculation
- the introduction of a neutral gas, which does not participate in the combustion in the cylinders, makes it possible to increase the pressure in the manifold without increasing the load. Indeed, in the case where an EGR flow is introduced into the engine upstream of the throttle body, the degree of opening of the latter does not control the air flow alone, but the total flow in the engine. which is equal to the sum of the air flow and the EGR flow.
- Known from the state of the art are engines equipped with active purge systems, integrating a venturi or a pump to suck the vapors towards the intake. These systems are rather used in cases where the point of reintroduction of fuel-laden vapors is located upstream of the throttle body, and they have the disadvantage of requiring piloting for the pump and the installation of additional parts.
- the object of the invention is to improve the purging capacity of the canister, without however making use of active purging systems.
- the object of the present invention is a method for passively purging the canister of a motor vehicle internal combustion engine equipped with at least one exhaust gas recirculation system at the intake.
- the method comprises the following steps: detection of a need for purging; calculation of a purge flow setpoint and a pressure setpoint Pp allowing the flow to be purged; calculation of the minimum pressure in the intake manifold to ensure the engine torque setpoint; adjustment of the engine to lower the pressure in the manifold to the level of the setpoint, within the limit of the minimum pressure which ensures the achievement of the engine torque.
- the invention aims to use a so-called passive purge system, which uses the natural depression of the engine intake manifold to suck fuel vapors from the canister when necessary. It will be noted that purging by a passive system as referred to by the invention is only possible if the pressure in the engine intake manifold is lower than the pressure in the canister.
- the engine operates on a conventional cycle.
- the engine is equipped with a variable valve timing system and operates according to an asymmetrical cycle of the Miller or Atkinson type.
- the need for purging is determined when the value of the filling rate of the canister reaches a predetermined threshold.
- the engine adjustment includes a drop in the EGR flow rate setpoint.
- engine tuning includes steering the valve timing system from Miller or Atkinson cycle engine operation to conventional cycle operation.
- the object of the invention is a passive purge system for the canister of a motor vehicle internal combustion engine equipped with at least one exhaust gas recirculation system at the inlet.
- the passive purge system comprises means for detecting a need to purge the canister, means for calculating a purge flow setpoint and a pressure setpoint, means for calculating a minimum pressure in the intake manifold to ensure an engine torque setpoint and means for adjusting the engine to lower the pressure in the manifold to the level of the setpoint, within the limit of the minimum pressure which ensures the achievement of the engine torque.
- FIG 2 and FIG 3 respectively represent the pressure-volume diagram of a cylinder of a four-stroke internal combustion engine of a motor vehicle according to a conventional, Miller or Atkinson;
- FIG 4 very schematically illustrates an example of the structure of an internal combustion engine of a motor vehicle equipped with a canister purge control system according to the invention.
- FIG 5 illustrates a flowchart of the canister purge process, according to one embodiment of the invention.
- the internal combustion engine 10 comprises, in a non-limiting manner, three cylinders 12 in line, a fresh air intake manifold 14, an exhaust manifold 16, a turbo-compression 18, a variable timing system 50 of the valves at the intake 51 and the valves at the exhaust 52.
- the cylinders 12 are supplied with air via the intake manifold 14, or distributor, itself supplied by a pipe 20 provided with an air filter 22 and the turbocharger 18 of the engine 10.
- the turbocharger 18 essentially comprises a turbine 18a driven by the exhaust gases and a compressor 18b mounted on the same axis or shaft as the turbine 18a and providing compression of the air distributed by the air filter 22, with the aim of ' increase the quantity (mass flow) of air admitted into the cylinders 12 of the engine 10.
- the internal combustion engine 10 comprises an intake circuit Ca and an exhaust circuit Ce.
- the intake circuit Ca comprises, from upstream to downstream in the direction of air circulation:
- a heat exchanger 32 configured to cool the admission gases corresponding to a mixture of fresh air and recirculated gases after their compression in the compressor 18b;
- the compressor is associated with a bypass circuit equipped with an intake relief valve 55 which opens in the event of sudden closing of the throttle body 30, to prevent the compressed air, located between the compressor 18b and the throttle body 30, does not cross the compressor 18b and does not degrade it, when for example, the driver of the vehicle suddenly lifts his foot from the accelerator pedal.
- the exhaust circuit Ce includes, from upstream to downstream in the direction of circulation of the burnt gases:
- the latter collects the exhaust gases resulting from combustion and evacuates them to the outside, via a gas exhaust duct 34 leading to the turbine 18a of the turbocharger 18 and by an exhaust line 36 mounted downstream of the turbine 18a.
- the engine 10 further comprises a partial recirculation circuit 38 of the exhaust gases at the intake, called the “EGR” circuit (“exhaust gas recirculation” in Anglo-Saxon terms).
- This circuit 38 is here a low pressure exhaust gas recirculation circuit, called "EGR BP". It is connected to the exhaust line 36, downstream of said turbine 18a, and in particular downstream of the gas pollution control system 40 and returns the exhaust gases to the fresh air supply pipe 20, upstream of the compressor 18b of turbocharger 18, in particular downstream of flowmeter 26. Flowmeter 26 only measures the flow of fresh air alone.
- EGR BP low pressure exhaust gas recirculation circuit
- the recirculation circuit 38 comprises, in the direction of circulation of the recycled gases, a cooler 38a, a filter 38b, and a "V EGR BP" valve 38c configured to regulate the flow of exhaust gases at low pressure.
- the “V EGR BP” valve 38c is arranged downstream of the cooler 38a and of the filter 38b and upstream of the compressor 18b.
- the air intake valve 28 can also be used to force the circulation of a low pressure exhaust gas flow in the EGR circuit BP in the case where the depression between the exhaust circuit and the intake circuit would be insufficient. In this case, closing the valve 28 would create a depression downstream, capable of sucking gas from the EGR circuit BP.
- the engine is associated with a fuel circuit comprising, for example, fuel inj ectors (not referenced) injecting gasoline directly into each cylinder from a fuel tank (not shown).
- the engine comprises an electronic control unit 70 configured to control the different elements of the internal combustion engine from data collected by sensors at different locations of the engine.
- the electronic control unit 70 comprises a calculation module 72, a measurement module 73 and a control module 74.
- the engine speed-load operating point is adjusted by the engine computer 70 by adjusting in particular a quantity of air, a quantity of EGR recirculation gases BP, and a quantity of fuel.
- quantity is meant here a mass flow rate.
- the flow of air and the flow of recirculation gas EGR BP can be adjusted to setpoint values by the computer 70 of the engine by adjusting on the one hand the position of the throttle body 30 and the boost pressure of the turbocharger 18, which controls the total gas flow in the engine, and on the other hand that of the "V EGR BP" valve 38c of the recirculation circuit 38. If the engine is at an operating point without exhaust gas recirculation, the airflow is obtained directly by adjusting the throttle body.
- the engine 10 comprises a passive circuit 62 for purging fuel vapors from the canister 60, equipped with a solenoid valve 61 and opening out at a point of the intake circuit Ca located downstream of the throttle body 30.
- the canister 60 purge solenoid valve 61 is located on the purge circuit 62, between the canister 60 and the outlet point. Controlled by the computer 70, the solenoid valve 61 allows the recycling of the fuel vapors contained in the canister 60.
- the computer 70 is able and predisposed to determine the filling rate of the canister 60 and to control the opening of the solenoid valve 61, in case of need for purging.
- the filling rate of the canister 60 can be determined from the analysis of the flow of fuel to be injected by the fuel inj ectors during the regulation of the richness of the air-fuel mixture in closed loop at richness 1 by forcing a start of purge.
- the method 80 comprises a preliminary step 81 of nominal operation which corresponds to the operation of the motor 10 outside of any purge constraint of the canister 60.
- the motor 10 operates on a given speed-load operating point according to a torque setpoint corresponding to a vehicle acceleration setpoint determined according to the depression of the accelerator pedal by the user.
- the computer 70 defines an engine torque setpoint C to be obtained in order to obtain this acceleration.
- the computer 70 determines an air flow setpoint, a fuel flow setpoint, an EGR flow setpoint and a variable valve timing setpoint 50.
- the computer 70 adjusts various actuators of the engine 10 to obtain this adjustment, which aims to minimize the fuel consumption of the vehicle and which does not take account of the needs for purging the canister.
- the computer 70 adjusts a degree of opening of the throttle body 30 and the position of the valves 50 to adjust the overall gas flow Qmot in the engine and it adjusts the degree of opening of the "V EGR BP" valve 38c to adjust the EGR gas flow Qegr, the air flow Qair being obtained using the following equation:
- the computer 70 detects a need to purge the canister.
- the computer 70 determines a flow rate Qp of vapors to be evacuated to prevent the canister from saturating and fuel leaks from occurring into the outside atmosphere (step 83).
- the computer 70 calculates the pressure setpoint Pp not to be exceeded in the collector intake and which is sufficient to obtain the purge flow rate Qp determined in step 83.
- the computer 70 uses preprogrammed maps contained in its memory, which link the pressure in the intake manifold Pcol, the atmospheric pressure Pext and the purge flow Qp. The reuse of this model allows the computer 70 to determine the pressure setpoint Pp as a function of the purge flow rate setpoint Qp and the atmospheric pressure Pext.
- step 85 it is checked whether the pressure measured in the intake manifold Pcol is less than or equal to the pressure setpoint Pp determined in the previous step. If this is the case, the suction of the fuel vapors from the canister takes place naturally, without any additional intervention being necessary and the method returns to step 81 of nominal operation. If the pressure measured in the intake manifold Pcol exceeds the pressure set point Pp, the pressure in the intake manifold must drop to allow the canister to bleed.
- the process always gives priority to achieving the engine torque setpoint C and never proceeds, with a view to purging the canister, to adjusting the engine to lower the pressure in the manifold to a pressure lower than the minimum pressure to ensure the engine torque C.
- the computer 70 determines the minimum pressure in the intake manifold, necessary to ensure the engine torque setpoint C (step 86).
- the computer 70 uses an engine air filling model, preprogrammed and contained in its memory, which makes it possible to determine the value of the minimum pressure of the intake manifold to respond to the torque setpoint of the engine C.
- the total gas flow Qmot entering the engine can be determined using this filling model, from a filling efficiency value and the values of the pressure Pcol and the temperature Tcol prevailing in the intake manifold which can be measured by the pressure and temperature sensors 33.
- the term " filling " is defined as being equal to the ratio between the mass of air sucked in and the mass of air that could have entered by considering only the total volume cylinders.
- the filling formula is expressed by the following equation: Q x 120
- rdvi denotes volumetric, dimensionless efficiency
- N designates the speed, in revolutions/min
- Cylinder designates the cylinder capacity of the engine, in m3 ;
- Pcol is the pressure in the intake manifold, in Pa
- Tcol designates the temperature in the intake manifold, in K
- R denotes the ideal gas constant for air equal to approximately 287.058 fcg X K'
- the efficiency value ] r dvi depends on the speed N and the pressure in the intake manifold Pcol . If the engine is equipped with a variable valve timing system, in particular at the intake, the yield r avl also depends on their position.
- Equation (2) connects a possible pressure value in the intake manifold to a total mass flow value, via a volumetric efficiency value which can also take on several possible values, in particular depending on the valve timing.
- the computer 70 identifies among the plurality of possible values, a minimum pressure value Pcol mini in the intake manifold which makes it possible to ensure the air flow Qmot corresponding to the engine torque C requested, on the condition that the flow EGR is zero and the position of the valve timing system 50 ensures maximum filling of the cylinders 12.
- step 87 the computer 70 compares the value of Pcol mini with the pressure setpoint Pp. If the minimum pressure value Pcol mini in the intake manifold which makes it possible to achieve the engine torque setpoint C is greater than the pressure setpoint Pp, this means that the computer 70 cannot carry out the purge while respecting the setpoint of motor torque C. In this case, the priority is to ensure the motor torque setpoint C, the method returns to step 81 of nominal operation and the purge is carried out later, when the motor torque setpoint has decreased.
- the computer 70 begins the adjustment step 88 starting by reducing the EGR rate, until the desired pressure is reached in the manifold. admission. To do this, it is possible, for example, to gradually lower the EGR flow setpoint while maintaining the air flow setpoint Qair. This translates into progressive closures of the EGR valve 38c so as to obtain the lower EGR flow rate required with, in parallel, the progressive closing of the throttle body 30 so as to obtain the total engine flow setpoint Qmot, which is lower because of the drop in the EGR flow set point.
- the computer does not modify the position of the valve timing system 50. This gradual closing of the throttle body 30 is accompanied by a drop in the pressure Pcol in the intake manifold.
- the computer 70 continues to gradually lower the EGR flow rate setpoint until the pressure value Pp is reached in the manifold which allows passive purging of the canister 60.
- the drop in the EGR rate is generally sufficient to bleed the canister.
- the computer 70 drives the valve timing system 50 to move away from the Miller or Atkinson cycle engine operation and approach a conventional cycle operation.
- the computer 70 can close the inlet valves 51 later before bottom dead center and in parallel close the throttle valve 30 further so as not to modify the gas flow Qmot entering the engine.
- the computer 70 can close the intake valves 51 earlier after bottom dead center and in parallel close the throttle body 30 further so as not to modify the gas flow Qmot entering the engine.
- the process 80 stops with the passive purge of the canister 60.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2111837A FR3128975A1 (fr) | 2021-11-08 | 2021-11-08 | Procédé et système de purge d’un canister d’un moteur à combustion équipé d’au moins un circuit de recirculation des gaz d’échappement |
FRFR2111837 | 2021-11-08 |
Publications (1)
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WO2023078969A1 true WO2023078969A1 (fr) | 2023-05-11 |
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Family Applications (1)
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PCT/EP2022/080623 WO2023078969A1 (fr) | 2021-11-08 | 2022-11-03 | Procédé et système de purge d'un canister d'un moteur à combustion équipé d'au moins un circuit de recirculation des gaz d'échappement |
Country Status (2)
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FR (1) | FR3128975A1 (fr) |
WO (1) | WO2023078969A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150059700A1 (en) * | 2013-09-05 | 2015-03-05 | Ford Global Technologies, Llc | Vapor purging octane separation system |
US9273643B2 (en) * | 2012-08-10 | 2016-03-01 | Tula Technology, Inc. | Control of manifold vacuum in skip fire operation |
US10060393B2 (en) * | 2013-02-11 | 2018-08-28 | Ford Global Technologies, Llc | Purge valve and fuel vapor management system |
-
2021
- 2021-11-08 FR FR2111837A patent/FR3128975A1/fr active Pending
-
2022
- 2022-11-03 WO PCT/EP2022/080623 patent/WO2023078969A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9273643B2 (en) * | 2012-08-10 | 2016-03-01 | Tula Technology, Inc. | Control of manifold vacuum in skip fire operation |
US10060393B2 (en) * | 2013-02-11 | 2018-08-28 | Ford Global Technologies, Llc | Purge valve and fuel vapor management system |
US20150059700A1 (en) * | 2013-09-05 | 2015-03-05 | Ford Global Technologies, Llc | Vapor purging octane separation system |
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FR3128975A1 (fr) | 2023-05-12 |
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