EP2956656A1 - Method for controlling a control valve for controlling the flow rate of a coolant for cooling the recirculated gases of an internal combustion engine - Google Patents
Method for controlling a control valve for controlling the flow rate of a coolant for cooling the recirculated gases of an internal combustion engineInfo
- Publication number
- EP2956656A1 EP2956656A1 EP14705834.1A EP14705834A EP2956656A1 EP 2956656 A1 EP2956656 A1 EP 2956656A1 EP 14705834 A EP14705834 A EP 14705834A EP 2956656 A1 EP2956656 A1 EP 2956656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant
- temperature
- control
- heat exchanger
- internal combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 58
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 238000001816 cooling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 title claims description 44
- 238000011144 upstream manufacturing Methods 0.000 claims description 16
- 239000003546 flue gas Substances 0.000 claims description 15
- 230000006870 function Effects 0.000 description 10
- 239000000110 cooling liquid Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000000446 fuel Substances 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
-
- 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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- 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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/16—Outlet manifold
-
- 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
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
Definitions
- the present invention generally relates to the field of recirculation of burnt gases from the exhaust to the inlet of an internal combustion engine.
- It relates more particularly to a control method of a control valve of a flow of coolant circulating in a cooling circuit of a recirculation line of an internal combustion engine.
- a control valve of a coolant flow rate which is arranged on one of said circulation ducts.
- Such a cooling circuit then comprises a heat exchanger, said cooler EGR, which is crossed, on the one hand, by the recirculation gas, and, on the other hand, by a cooling liquid.
- the cooling circuit also comprises a bistable valve, located downstream of the EGR cooler, which is controlled in the open or closed position depending on the measured temperature of the recirculation gases.
- the opening of the bistable valve generates a large and brutal cooling of the recirculation gases, in particular when the internal combustion engine has not yet reached its optimum operating temperature.
- the closure of the bistable valve also prevents any circulation of coolant in the EGR cooler, which can lead to a failure of cooling of the recirculation gases and a release into the atmosphere of a large amount of soot particles and dusts. 'hydrocarbon.
- the coolant blocked in the EGR cooler may reach its boiling point and cause damage to the EGR cooler.
- the present invention proposes a method for controlling the more reliable control valve. More particularly, there is provided according to the invention a method for controlling a control valve for a flow rate of coolant circulating in a cooling circuit of a recirculation line of an internal combustion engine, which comprises steps of:
- step b) determining, as a function of the temperature acquired in step a), a control setpoint for said control valve in a stable position chosen from at least three stable positions, and
- step c) control the control valve according to the control setpoint determined in step b).
- control valve is controlled between a greater number of positions, which allows a better regulation of the flow of coolant and avoids any problem of boiling or sudden temperature change.
- This better regulation also considerably reduces the fouling of the cooling circuit, especially when starting the engine or when the ambient temperature is low.
- control of the control valve as a function of the temperature of the coolant ensures a more precise regulation of the temperature of the recirculation gases.
- the cooling circuit comprising a heat exchanger positioned on the recirculation line, in step a), the temperature of the cooling liquid is measured in said heat exchanger;
- the cooling circuit comprising a heat exchanger positioned on the recirculation line, in step a), the temperature of the cooling liquid is measured at a distance from said heat exchanger;
- step a) the temperature of the coolant is measured downstream of said heat exchanger
- step b) the ambient temperature is measured, a target temperature of coolant is deduced therefrom and the set point of control as a function of the temperature of the measured coolant and the target temperature;
- a coolant temperature value is estimated upstream of said heat exchanger as a function of the measured coolant temperature, a flue gas flow rate in said recirculation line and a temperature of burnt gas in said recirculation line, then said control setpoint is determined by means of a map which associates, with each estimated coolant temperature value, a control setpoint;
- step a) the temperature of the coolant is measured upstream of said heat exchanger
- step b) said control setpoint is determined by means of a map which associates, at each value of coolant temperature, a control setpoint.
- the invention also provides a cooling circuit as defined in the introduction which comprises a control unit of said control valve, which is adapted to implement a control method as defined above.
- the invention further provides an internal combustion engine as defined in the introduction which comprises a cooling circuit as defined above, the heat exchanger of which is positioned on said recirculation line.
- FIG. 1 is a schematic view of an internal combustion engine according to the invention.
- FIG. 2 is a schematic view of part of the secondary cooling circuit according to a first embodiment of the internal combustion engine of FIG. 1;
- FIG. 3 is a timing diagram illustrating the steps for implementing the control method of the control valve of the secondary cooling circuit of FIG. 2;
- FIG. 4 is a schematic view of part of the secondary cooling circuit according to a second embodiment of the internal combustion engine of FIG. 1;
- FIG. 5 is a timing diagram illustrating the steps for implementing the control method of the control valve of the secondary cooling circuit of FIG. 4.
- upstream and downstream will be used in the direction of the flow of gases, from the point of collection of fresh air into the atmosphere to the exit of the flue gases in the atmosphere. atmosphere.
- FIG. 1 diagrammatically shows an internal combustion engine 1 of a motor vehicle, which comprises an engine block 10 provided with a crankshaft and four pistons (not shown) housed in four cylinders 11.
- This engine is here compression ignition (Diesel). It could also be spark ignition (gasoline).
- the internal combustion engine 1 Upstream of the cylinders 11, the internal combustion engine 1 comprises an intake line 20 which takes fresh air into the atmosphere and which opens into an air distributor 25 arranged to distribute the air to each of the four cylinders 1 1 of the engine block 10.
- This intake line 20 comprises, in the direction of flow of fresh air, an air filter 21 which filters the fresh air taken from the atmosphere, a compressor 22 which compresses the fresh air filtered by the air filter 21, a main air cooler 23 which cools this fresh compressed air, and an inlet valve 24 which regulates the fresh air flow opening into the distributor of the air air 25.
- the internal combustion engine 1 comprises an exhaust line 80 which extends from an exhaust manifold 81 into which the gases which have been previously burned into the cylinders 1 1, up to an exhaust silencer 87 for relaxing the flue gases before they are discharged into the atmosphere. It involves Furthermore, in the flow direction of the flue gas, a turbine 82, and a catalytic converter 83 for treating flue gas.
- the turbine 82 is rotated by the flow of burnt gases leaving the exhaust manifold 81, and it drives the compressor 22 in rotation, by means of mechanical coupling means such as a simple drive shaft.
- the catalytic converter 83 is here a three-way catalyst which contains an oxidation catalyst 84, a particulate filter 85 and a nitrogen oxide trap 86.
- the internal combustion engine 1 also comprises a high-pressure flue gas recirculation line, from the exhaust line 80 to the intake line 20.
- This recirculation line is commonly called the EGR-HP line 40, in accordance with FIG. to the English acronym of "Exhaust Gas Recirculation - High Pressureā. It originates in the exhaust line 80, between the exhaust manifold 81 and the turbine 82, and it opens into the intake line 20, between the inlet valve 24 and the air distributor 25.
- This line EGR-HP 40 makes it possible to take a part of the flue gases circulating in the exhaust line 80, called recirculation gases or EGR gas, for reinjecting it into the cylinders 11 in order to reduce the pollutant emissions of the engine, and particular emissions of nitrogen oxides, soot and hydrocarbon particles.
- This EGR-HP line 40 comprises an EGR-HP valve 41 for regulating the flow of EGR gas opening into the air distributor 25.
- the internal combustion engine 1 also comprises a fuel injection line 60 in the cylinders 11.
- This injection line 60 comprises an injection pump 62 arranged to collect the fuel in a reservoir 61 in order to bring it under pressure into a distribution rail 63 which opens into the cylinders 11 via four injectors 64.
- the internal combustion engine 1 further comprises a primary cooling circuit (not shown), which in particular passes through the engine block 10 and the main air cooler 23 and in which circulates a cooling liquid.
- a primary cooling circuit (not shown), which in particular passes through the engine block 10 and the main air cooler 23 and in which circulates a cooling liquid.
- the internal combustion engine 1 also comprises a secondary cooling circuit 30, which could possibly be confused with the primary cooling circuit, and which comprises a heat exchanger 31 provided for cooling the EGR gases flowing in the line EGR-HP 40 (or alternatively, in line EGR-LP), so as to best reduce the temperature of the gases in the air distributor 25 to provide the internal combustion engine 1 better performance.
- a secondary cooling circuit 30 which could possibly be confused with the primary cooling circuit, and which comprises a heat exchanger 31 provided for cooling the EGR gases flowing in the line EGR-HP 40 (or alternatively, in line EGR-LP), so as to best reduce the temperature of the gases in the air distributor 25 to provide the internal combustion engine 1 better performance.
- the heat exchanger 31, here called EGR cooler 31, is positioned on the line EGR-HP 40 to cool the EGR gas.
- the EGR cooler 31 more specifically comprises a main pipe 31A through which the EGR gas flows, and a secondary pipe 31 B through which circulates a cooling liquid.
- the main line 31 A is connected, on one side, to the exhaust line 80 via an upstream line 42 of the EGR-HP line 40, and, on the other hand, to the EGR-HP valve 41 via a conduit downstream 43 of the line EGR-HP 40.
- the secondary pipe 31 B is connected to the remainder of the secondary cooling circuit 30, on one side, by an upstream pipe 33, and on the other by a downstream pipe 34.
- the secondary cooling circuit 30 further comprises a control valve 35 of the coolant flow.
- This control valve 35 is here arranged on the upstream duct 33 of the secondary cooling circuit 30. In a variant, it could of course be arranged elsewhere, for example on the downstream duct.
- the control valve 35 is adapted to be driven in one or the other of at least three stable positions, of which:
- the flow rate of the cooling liquid circulating in the secondary cooling circuit 30 is non-zero and is strictly less than the maximum flow rate.
- the control valve 35 is here a butterfly flap, but it could of course be otherwise.
- the circulation of the coolant in this secondary cooling circuit 30 is provided by a pressurizing pump (not shown).
- the coolant used here is a mixture of water and glycol.
- a computer 100 comprising a processor (CPU), a random access memory (RAM), a read only memory (ROM), analog converters digital (AD) and input and output interfaces.
- CPU central processing unit
- RAM random access memory
- ROM read only memory
- AD analog converters digital
- the computer 100 is adapted to receive different sensors input signals relating to engine operation and climatic conditions.
- a first temperature probe 101 which makes it possible to measure the instantaneous temperature T 0 of coolant circulating in the secondary cooling circuit 30.
- this first temperature probe 101 is located in the downstream duct 34.
- a second temperature probe 102 is also provided for measure the ambient temperature Ta, that is to say the temperature outside the vehicle equipped with the internal combustion engine 1.
- the first temperature probe 101 is located in the upstream duct 33.
- the first temperature probe will therefore be positioned at a distance from the EGR cooler 31, preferably at 10 cm from the latter, so that the measurements are not disturbed by the EGR cooler 31.
- the first temperature sensor is located inside the EGR cooler itself.
- the computer 100 thus stores continuously in its random access memory:
- the load C (also called āengine loadā) corresponds to the ratio of the work supplied by the engine to the maximum work that could develop this engine at a given speed. It is usually approximated using a variable called effective average pressure SME.
- the R speed corresponds to the speed of rotation of the crankshaft, expressed in revolutions per minute. Thanks to a predetermined mapping on test bench and stored in its read-only memory (ROM), the computer 100 is adapted to generate, for each operating condition of the engine, output signals.
- ROM read-only memory
- the computer 100 is adapted to transmit these output signals to the various components of the engine, in particular to the control valve 35.
- the computer 100 is initialized then controls the starter and the fuel injectors 64 for them to start the internal combustion engine 1.
- the fresh air taken from the atmosphere through the intake line 20 is filtered by the air filter 21, compressed by the compressor 22, cooled by the main air cooler 23, and then burned in the cylinders 1 1.
- the flue gases are expanded in the turbine 82, treated and filtered in the catalytic converter 83, then relaxed again in the exhaust silencer 84 before being released into the atmosphere.
- the computer 100 for this purpose controls the control valve 35 of the coolant flow circulating in the secondary cooling circuit 30, so that these EGR gases are cooled to the desired temperature.
- this control valve 35 is controlled in extreme closed position (the time that the temperature of the EGR gas increases) before being gradually opened.
- the computer 100 is adapted to implement a control method of the control valve 35 which comprises the following three steps: a) acquiring the temperature To of the coolant,
- step b) determining, as a function of the temperature To, acquired in step a), a control setpoint C1 of the control valve 35 in one of its stable positions, and
- the coolant flow circulating in the secondary cooling circuit 30 is regulated as a function of the temperature T 0 of the coolant (and not as a function of the temperature of the EGR gases), which in particular avoids any risk of boiling or sudden change of coolant temperature, in favor of the longevity of the EGR cooler 31.
- control valve 35 may have at least five stable positions. It can of course be expected that it can have more than 10 stable positions.
- control valve 35 can take an infinity of stable positions.
- Control of the control valve 35 will not be implemented in exactly the same way, depending on whether the internal combustion engine is of the type described with reference to FIG. 2 or that described with reference to FIG.
- the control method of the control valve 35 will be implemented as shown in the flowchart of FIG. 3. More specifically, after the start of the internal combustion engine (operation 71), the initialization of the computer 100 and the start of the circulation of the coolant in the secondary cooling circuit 30 (operation 72), the computer 100 implements the following algorithm.
- the computer 100 first checks whether a stopping of the internal combustion engine 1 is required (operation 73).
- the computer 100 controls the stopping of the coolant pressurizing pump (operation 74) and the stopping of the injection of fuel into the cylinders 1 1 (operation 75).
- the computer 100 acquires the temperature To of the coolant downstream of the cooler EGR 31 (operation 76) as well as the ambient temperature Ta (operation 77).
- the calculator 100 then calculates a target temperature Tc of coolant as a function of at least ambient temperature Ta measured (operation 78).
- This target temperature Te corresponds to the optimum temperature of the coolant, ensuring a reduced fouling of the EGR-HP line 40.
- this target temperature Te is carried out using a mathematical formula or a map stored in the read-only memory (ROM) of the computer 100 (this map corresponding, at each ambient temperature Ta, a target temperature Te ).
- this target temperature Te for example the instantaneous load C of the internal combustion engine 1 and / or the instantaneous R speed of the internal combustion engine 1, and / or the injected fuel flow rate. in the cylinders 1 1.
- the computer 100 then compares the measured coolant temperature To with the calculated target temperature Te (operation 79).
- control valve 35 is controlled at the opening (operation 84), so as to increase the flow of coolant circulating in the EGR cooler 31.
- the control set point C1 being here formed by the opening angle that the control valve 35 must take (C1 being equal to zero in the extreme closed position), this control setpoint C1 is calculated in the following manner (operation 83). ):
- k is a predetermined constant stored in the read-only memory (ROM) of the computer 100,
- At is a time difference (in this case the time step between two successive calculations of the control setpoint C1), and
- the regulation valve 35 is controlled on closing (operation 82), so as to reduce the flow rate of coolant circulating in the EGR cooler 31.
- control setpoint C1 is then calculated in the following manner (operation 81):
- This control setpoint C1 is then transmitted to the control valve 35, which opens or closes accordingly (operations 82 or 84).
- the computer 100 returns to the beginning of the loop (operation 73).
- the control method of the control valve 35 is implemented as shown in the flowchart of FIG. 5.
- the computer 100 first checks whether a stopping of the internal combustion engine 1 is required (operation 73).
- the computer 100 controls the stopping of the pressurizing pump of the cooling liquid (operation 74) and stopping the injection of fuel into the cylinders 11 (operation 75).
- the computer 100 acquires the temperature To of the coolant upstream of the cooler EGR 31 (operation 76). It should be noted here that it is not intended to acquire the ambient temperature.
- the computer 100 then directly determines the control setpoint C1, reading its value in a map stored in the read-only memory (ROM) of the computer 100 (operations 85 and 86).
- this mapping corresponds, at each temperature To, to a control setpoint C1.
- control setpoint C1 is transmitted to the control valve 35, which opens or closes accordingly (operation 87).
- valve for regulating the coolant flow otherwise, especially when the temperature probe is located in the EGR cooler or downstream of the EGR cooler.
- the flow rate and the temperature of the EGR gases can be measured or calculated as a function of engine speed and torque.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1351334A FR3002276B1 (en) | 2013-02-15 | 2013-02-15 | METHOD FOR CONTROLLING A RECIRCULATING GAS FLOW CONTROL VALVE OF AN INTERNAL COMBUSTION ENGINE |
PCT/FR2014/050117 WO2014125181A1 (en) | 2013-02-15 | 2014-01-22 | Method for controlling a control valve for controlling the flow rate of a coolant for cooling the recirculated gases of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2956656A1 true EP2956656A1 (en) | 2015-12-23 |
EP2956656B1 EP2956656B1 (en) | 2017-03-22 |
Family
ID=48521192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14705834.1A Active EP2956656B1 (en) | 2013-02-15 | 2014-01-22 | Method for controlling a control valve for controlling the flow rate of a coolant for cooling the recirculated gases of an internal combustion engine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2956656B1 (en) |
FR (1) | FR3002276B1 (en) |
WO (1) | WO2014125181A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55131557A (en) * | 1979-04-02 | 1980-10-13 | Toyota Motor Corp | Egr gas temperature controller |
US8056544B2 (en) * | 2008-08-27 | 2011-11-15 | Ford Global Technologies, Llc | Exhaust gas recirculation (EGR) system |
KR101251526B1 (en) * | 2011-06-13 | 2013-04-05 | źø°ģģėģ°Øģ£¼ģķģ¬ | Low pressure egr system and examining method for efficeincy of low egr cooler |
-
2013
- 2013-02-15 FR FR1351334A patent/FR3002276B1/en not_active Expired - Fee Related
-
2014
- 2014-01-22 EP EP14705834.1A patent/EP2956656B1/en active Active
- 2014-01-22 WO PCT/FR2014/050117 patent/WO2014125181A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2014125181A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014125181A1 (en) | 2014-08-21 |
FR3002276A1 (en) | 2014-08-22 |
FR3002276B1 (en) | 2016-05-27 |
EP2956656B1 (en) | 2017-03-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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