WO2013065112A1 - 内燃機関の換気制御装置 - Google Patents
内燃機関の換気制御装置 Download PDFInfo
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- WO2013065112A1 WO2013065112A1 PCT/JP2011/075105 JP2011075105W WO2013065112A1 WO 2013065112 A1 WO2013065112 A1 WO 2013065112A1 JP 2011075105 W JP2011075105 W JP 2011075105W WO 2013065112 A1 WO2013065112 A1 WO 2013065112A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/0011—Breather valves
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- 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
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/16—Control of the pumps by bypassing charging air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
- F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
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- 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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
-
- 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
- F02M25/06—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding lubricant vapours
-
- 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
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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
- 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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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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
- 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
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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
- 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
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
- F01M2013/027—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure with a turbo charger or 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
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a ventilation control device for an internal combustion engine, and more particularly to a ventilation control device for an internal combustion engine that processes blow-by gas.
- blow-by gas reduction devices are known in which gas flowing into a crankcase through a gap between a piston and a cylinder wall of an internal combustion engine is reintroduced into the internal combustion engine via an intake manifold and burned without being released into the atmosphere.
- a first PCV (Positive Crankcase Ventilation) passage that connects a cylinder head of an internal combustion engine and an intake passage, an intake passage and a cylinder head that are downstream of a connection portion between the first PCV passage and the intake passage
- a blow-by gas reduction device is disclosed that includes a second PCV passage connecting the two and a PCV valve provided in the second PCV passage.
- blow-by gas reduction device utilizes the fact that the pressure in the intake manifold (in manifold pressure) becomes a negative pressure. According to the blow-by gas reduction device, blow-by gas can be introduced from the crankcase into the first PCV passage, and fresh air can be introduced into the crankcase from the second PCV passage to ventilate the crankcase.
- Patent Document 2 discloses an internal combustion engine with a supercharger equipped with an EGR device.
- This internal combustion engine with a supercharger includes an EGR passage that connects an exhaust passage upstream of an exhaust turbine and an intake passage downstream of a compressor, an ejector disposed on the EGR passage, and a connection point between the intake passage and the EGR passage. And a connection passage that connects the intake passage on the upstream side and the ejector.
- the ejector In this internal combustion engine with a supercharger, the ejector is arranged so that its nozzle portion is upstream of the EGR passage (that is, the exhaust passage side) and its diffuser portion is downstream of the EGR passage (that is, the intake passage side). It is installed. Therefore, when the EGR gas is introduced, the intake air in the connection passage can be sucked into the EGR passage by the EGR gas flowing through the ejector, so that the intake air flow introduced into the intake manifold can be increased.
- Japanese Unexamined Patent Publication No. 2006-226159 Japanese Unexamined Patent Publication No. 2008-232091 Japanese Unexamined Patent Publication No. 07-279640 Japanese Unexamined Patent Publication No. 2009-2286 Japanese Unexamined Patent Publication No. 2007-138790
- the blow-by gas reduction device when the blow-by gas reduction device is applied to the supercharged internal combustion engine, the following problems arise. That is, in the supercharging region where the supercharger is operated, there is a region where the intake manifold pressure becomes positive. When the intake manifold pressure becomes positive, the amount of blow-by gas introduced into the intake manifold decreases. If it does so, gas will stay in a crankcase and a crankcase internal pressure will rise.
- the internal combustion engine with a supercharger is an internal combustion engine that tends to have a higher in-cylinder pressure than an internal combustion engine without a supercharger, and the crankcase internal pressure is particularly likely to increase. Therefore, in an internal combustion engine with a supercharger, ventilation in the crankcase becomes insufficient, which may accelerate oil deterioration.
- an object of the present invention is to provide a ventilation control device for an internal combustion engine capable of satisfactorily ventilating a crankcase in an internal combustion engine with a supercharger.
- a first invention is a ventilation control device for an internal combustion engine,
- a turbocharger comprising a compressor provided in an intake passage of an internal combustion engine and an exhaust turbine provided in an exhaust passage of the internal combustion engine;
- a first bypass passage connecting an exhaust passage upstream of the exhaust turbine and an intake passage downstream of the compressor;
- a first PCV passage connecting the cylinder head of the internal combustion engine and the first bypass passage in the middle of the first bypass passage;
- a blow-by that is provided at a connection point between the first bypass passage and the first PCV passage and flows through the first PCV passage by a pressure difference between an exhaust passage internal pressure on the upstream side of the exhaust turbine and an intake passage internal pressure on the downstream side of the compressor.
- First gas introduction means for introducing gas into the first bypass path It is characterized by providing.
- the second invention is the first invention, wherein Blow-through control determination means for determining whether or not there is a request for blow-through control for blowing intake air from the intake passage to the exhaust passage via the first bypass passage; An introduction prohibiting means for prohibiting introduction of blow-by gas flowing through the first PCV passage into the first bypass passage when it is determined that there is a request for the blow-by control; It is characterized by providing.
- the third invention is the first or second invention, wherein A PCV valve provided in the first PCV passage and further permitting or prohibiting connection between the first PCV passage and the first gas introducing means is further provided.
- An exhaust cooling means provided in the first bypass passage for cooling the exhaust gas recirculated from the exhaust passage to the intake passage;
- Cold start determination means for determining whether or not the internal combustion engine is under a predetermined cold start condition;
- Cooling prohibiting means for prohibiting cooling of the exhaust by the exhaust cooling means when it is determined that the internal combustion engine is under the predetermined cold start condition; It is characterized by providing.
- a second bypass passage that bypasses the compressor in the intake passage;
- a second PCV passage connecting the cylinder head of the internal combustion engine and the second bypass passage in the middle of the second bypass passage;
- a blow-by gas that is provided at a connection point between the second bypass passage and the second PCV passage and flows through the second PCV passage due to a pressure difference between the intake passage internal pressure on the upstream side of the compressor and the intake passage internal pressure on the downstream side of the compressor.
- a second gas introduction means for introducing the gas into the second bypass passage It is characterized by providing.
- the first gas introduction means is provided at the connection point between the first bypass passage and the first PCV passage, the exhaust passage internal pressure on the exhaust turbine upstream side and the intake passage internal pressure on the compressor downstream side When a pressure difference occurs between them, blow-by gas flowing through the first PCV passage can be introduced into the first bypass passage.
- the pressure difference can be generated by flowing exhaust gas (that is, EGR gas) from the exhaust passage upstream of the exhaust turbine toward the intake passage downstream of the compressor. Therefore, ventilation in the crankcase can be favorably performed even in a region where the intake manifold pressure becomes positive.
- the introduction prohibiting unit can prohibit the blow-by gas flowing through the first PCV passage from flowing into the first bypass passage. Accordingly, it is possible to prevent the blow-by gas flowing through the first PCV passage from flowing into the exhaust passage.
- the connection between the first PCV passage and the first gas introduction means can be permitted or prohibited by the PCV valve.
- the PCV valve When exhaust gas flows from the exhaust passage toward the intake passage and the crankcase internal pressure decreases, the exhaust gas may flow through the first PCV passage and flow into the crankcase.
- the PCV valve is controlled to prohibit the connection between the first PCV passage and the first gas introducing means, it is possible to prevent such gas inflow.
- the exhaust gas flowing from the exhaust passage toward the intake passage contains water vapor. Therefore, the water vapor is liquefied by cooling the exhaust gas by the exhaust cooling means. If the internal combustion engine is under predetermined cold start conditions, this water vapor may solidify. If it does so, the inside of the 1st gas introduction means may be obstruct
- the cooling prohibiting means prohibits the cooling of the exhaust gas by the exhaust cooling means, so that such an internal blockage can be prevented in advance.
- the second gas introduction means is provided at the connection point between the second bypass passage and the second PCV passage, it is between the intake passage internal pressure on the compressor upstream side and the intake passage internal pressure on the compressor downstream side.
- blowby gas flowing through the second PCV passage can be introduced into the second bypass passage.
- the pressure difference can be generated by supercharging the intake air. Therefore, by combining the fifth invention with the first invention, ventilation in the crankcase can be carried out satisfactorily in a wide range of the supercharging range.
- FIG. 6 is a diagram showing the relationship among intake pipe pressure (intake pressure) and target supercharging pressure, torque, and EGR rate downstream of throttle valve 40; 7 is a flowchart illustrating a routine that is executed by an ECU in the second embodiment.
- FIG. 1 is a diagram illustrating a system configuration of a ventilation control device according to the present embodiment.
- the system of this embodiment includes an engine 10 as an internal combustion engine.
- the number of cylinders and the cylinder arrangement of the engine 10 are not particularly limited.
- the engine 10 includes a cylinder block 14 having a piston 12 therein.
- a cylinder head 16 is assembled to the upper part of the cylinder block 14.
- the cylinder head 16 is covered with a cylinder head cover 18.
- a space from the upper surface of the piston 12 to the cylinder head 16 forms a combustion chamber 20.
- the cylinder head 16 includes an intake passage 22 that communicates with the combustion chamber 20 and an exhaust passage 24.
- the system according to the present embodiment includes a supercharger 26.
- the supercharger 26 includes a turbine 26 a provided in the exhaust passage 24 and a compressor 26 b provided in the intake passage 22.
- the turbine 26a and the compressor 26b are connected to each other.
- the compressor 26b is driven by the turbine 26a that rotates by receiving the exhaust pressure, and the intake air is compressed and supercharged by the compressor 26b.
- the intake passage 22 is provided with an intercooler 28 for cooling the intake air supercharged by the compressor 26b.
- air bypass passages 30 and 32 for bypassing the compressor 26b are provided in the intake passage 22 upstream of the intercooler 28.
- ABV Air By-pass Valve
- An ejector 36 is provided in the air bypass passage 32. A detailed description of the ejector 36 will be described later.
- An air cleaner 38 is provided in the intake passage 22 upstream of the intercooler 28.
- an electronically controlled throttle valve 40 is provided in the intake passage 22 downstream of the intercooler 28.
- a surge tank 42 is provided in the intake passage 22 downstream of the throttle valve 40.
- the exhaust passage 24 is provided with an exhaust bypass passage 44 that bypasses the turbine 26a.
- the exhaust bypass passage 44 is provided with an electromagnetically driven WGV (Waste Gat Valve) 46. Since the back pressure can be adjusted by opening the WGV 46, the engine pump loss and the exhaust gas residual amount in the cylinder can be suppressed.
- WGV Wood Gat Valve
- the system of this embodiment is equipped with an EGR mechanism that recirculates exhaust gas from the exhaust passage 24 to the intake passage 22.
- the EGR mechanism includes an EGR passage 48 that connects the exhaust passage 24 upstream of the turbine 26 a and the surge tank 42.
- an EGR valve 50 for adjusting the amount of EGR gas, a water-cooled EGR cooler 52, and an EGR catalyst 54 are provided on the EGR passage 48.
- the EGR valve 50 is disposed at a position closest to the surge tank 42, and the EGR catalyst 54 is disposed at a position close to the exhaust passage 24.
- the EGR mechanism includes an ejector 56 between the EGR valve 50 and the EGR cooler 52. The detailed description of the ejector 56 will be described later together with the description of the ejector 36.
- the system of the present embodiment includes a blow-by gas reduction mechanism that reduces blow-by gas.
- the blow-by gas is a gas that flows into the crankcase through a gap between the piston 12 and the cylinder wall surface, and includes unburned fuel and oil mist.
- the blow-by gas reduction mechanism includes four types of PCV passages 58, 60, 62, and 64.
- the PCV passage 58 connects the cylinder head cover 18 and the surge tank 42.
- a PCV valve 66 is provided on the PCV passage 58.
- the PCV passage 60 connects the cylinder head cover 18 and the intake passage 22 on the upstream side of the compressor 26b.
- the PCV passage 62 connects the suction port 56 a of the ejector 56 and the cylinder head cover 18.
- a PCV valve 68 is provided on the PCV passage 62.
- the PCV passage 64 connects the suction port 36 a of the ejector 36 and the cylinder head cover 18.
- the system of the present embodiment includes an ECU (Electronic Control Unit) 70.
- ECU Electronic Control Unit
- Various sensors necessary for control of the engine 10 such as a throttle opening sensor for detecting the opening of the throttle valve 40 and a temperature sensor for detecting the coolant temperature of the engine 10 are connected to the input side of the ECU 70.
- Various actuators such as the ABV 34, the throttle valve 40, the WGV 46, and the EGR valve 50 are connected to the output side of the ECU 70.
- FIG. 2 is a diagram for explaining the structure of the ejectors 36 and 56.
- the ejectors 36 and 56 include suction ports 36a and 56a, nozzle portions 36b and 56b, and diffuser portions 36c and 56c, respectively.
- the suction port 36 a is connected to one end of the PCV passage 64.
- the nozzle part 36b is connected to the air bypass passage 32 on the intercooler 28 side.
- the diffuser portion 36c is connected to the air bypass passage 32 on the air cleaner 38 side.
- the suction port 56 a is connected to one end of the PCV passage 62.
- the nozzle portion 56b is connected to the EGR passage 48 on the EGR cooler 52 side.
- the diffuser portion 56c is connected to the EGR passage 48 on the EGR valve 50 side.
- FIG. 3 is a diagram for explaining the flow of blow-by gas in the non-supercharging region.
- a negative pressure downstream of the throttle valve 40 can be ensured to some extent. Therefore, the gas in the crankcase flows into the surge tank 42 via the cylinder head cover 18 and the PCV passage 58. At this time, fresh air flows into the crankcase from the intake passage 22 via the PCV passage 60 and the cylinder head cover 18.
- FIG. 4 is a diagram for explaining the flow of blow-by gas in the supercharging region.
- the pressure on the downstream side of the compressor 26b is higher than the pressure on the upstream side. Therefore, a driving flow can be generated inside the ejector 36. Therefore, the gas in the crankcase can be sucked from the PCV passage 64 and introduced into the surge tank 42 via the air bypass passage 32 so that the engine 10 can be recombusted.
- FIG. 5 is a graph showing the relationship between the opening of the WGV 46, the opening of the throttle valve 40, the blow-by gas flow rate, and the supercharging pressure.
- the blow-by gas flow rate in FIG. 5 is the total amount of blow-by gas reintroduced into the engine 10.
- the blow-by gas flow rate decreases. Therefore, when the throttle opening is maximized, the blow-by gas flow rate becomes zero. If the opening of the WGV 46 is reduced at this time, the supercharging pressure can be increased, so that the flow of the driving flow inside the ejector 36 can be secured. Therefore, as shown by the broken line in FIG.
- FIG. 6 is a diagram showing the relationship between engine speed and torque.
- the solid line in FIG. 6 shows the engine characteristics when the ejector 36 is not mounted, and the broken line in the figure shows the engine characteristics when the ejector 36 is mounted.
- FIG. 6 in the high speed range, when the ejector 36 is mounted, the engine performance is deteriorated compared to when the ejector 36 is not mounted. This is because the back pressure increases and the turbo work increases by executing the above-described control for reducing the opening of the WGV 46.
- FIG. 7 is a diagram for explaining the flow of blow-by gas when EGR gas is introduced.
- the pressure in the exhaust passage 24 becomes higher than the intake manifold pressure. Therefore, a driving flow can be generated inside the ejector 56.
- the gas in the crankcase can be sucked from the PCV passage 62, introduced into the surge tank 42 via the EGR passage 48, and recombusted by the engine 10. Therefore, the ventilation which solved the above-mentioned problem becomes possible.
- the crankcase can be ventilated in the entire range from the non-supercharged region to the supercharged region.
- FIG. 8 is a diagram showing the relationship among the intake pipe pressure (intake pressure) and the target supercharging pressure, the torque, and the EGR rate on the downstream side of the throttle valve 40.
- the intake pressure is negative in the region where the target boost pressure is low. Therefore, as described in FIG. 3, the gas in the crankcase can be introduced into the surge tank 42 via the PCV passage 58.
- the boost pressure can be used in a region where the target boost pressure is high. Therefore, as described in FIG. 4, the gas in the crankcase can be sucked from the PCV passage 64 and introduced into the surge tank 42 via the air bypass passage 32.
- the gas in the crankcase When introducing the EGR gas, the gas in the crankcase can be sucked from the PCV passage 62 and introduced into the surge tank 42 via the EGR passage 48. Therefore, the gas in the crankcase can be introduced into the surge tank 42 even in an intermediate load region where the intake manifold pressure is positive (that is, a region where the target boost pressure is medium). In addition, this EGR gas introduction can be performed regardless of the target boost pressure level. Therefore, according to this embodiment, ventilation in the crankcase can be performed in the entire range from the non-supercharged region to the supercharged region. Moreover, as shown in FIG. 8, according to this embodiment, the ventilable area of FIG. 3 and FIG. 4 and the ventilable area of FIG. 7 can be combined. Therefore, according to the present embodiment, the crankcase can be well ventilated in the entire range from the non-supercharged region to the supercharged region.
- the EGR passage 48 is the “first bypass passage” in the first invention
- the PCV passage 62 is the “first PCV passage” in the first invention
- the ejector 56 is the first This corresponds to the “first gas introduction means” in the first invention.
- the PCV valve 68 corresponds to the “PCV valve” in the third aspect of the invention.
- the air bypass passage 32 is the “second bypass passage” in the fifth invention
- the PCV passage 64 is the “second PCV passage” in the fifth invention
- the ejector 36 is the above This corresponds to the “fifth gas introduction means” in the fifth invention.
- Embodiment 2 of the present invention will be described with reference to FIG.
- the present embodiment is characterized in that the routine of FIG. 9 is executed in the system configuration described in the first embodiment.
- the control for closing the PCV valve 68 is executed when the crankcase internal pressure decreases when the EGR gas is introduced.
- the blow-through control is control for forcibly introducing the intake air in the intake passage 22 into the exhaust passage 24 via the EGR passage 48 for the purpose of improving the supercharging response.
- the above-described problem is caused by providing the ejector 56 in the EGR passage 48.
- water vapor is contained in the EGR gas.
- an EGR cooler 52 is provided in the EGR passage 48. Therefore, when the EGR gas is cooled by the EGR cooler 52 and the gas temperature is lowered, the water vapor may be condensed and liquefied and accumulated in the ejector 56.
- the water generated by the liquefaction can be discharged out of the ejector 56 together with the EGR gas by the flow of the EGR gas.
- the temperature of the EGR gas cooled by the EGR cooler 52 is further lowered, so that water generated by liquefaction may be frozen.
- ice generated by freezing accumulates in the ejector 56, the flow rate and pressure of the EGR gas are changed.
- the control for closing the PCV valve 68 is executed during the execution of the blow-by control.
- an unintended gas flow in which the gas in the crankcase flows into the exhaust passage 24 can be prevented in advance.
- the gas cooling in the EGR cooler 52 is stopped. Thereby, it is possible to prevent the water generated by liquefaction inside the ejector 56 from freezing.
- FIG. 9 is a flowchart showing a routine executed by the ECU 70 in the present embodiment. Note that the routine shown in FIG. 9 is repeatedly executed periodically.
- the ECU 70 determines whether or not it is during a cold start (step 100). Specifically, when there is a start request for the engine 10 and the cooling water temperature is equal to or lower than a predetermined temperature, it is determined that it is a cold start time. In this step, when it is determined that it is not during the cold start, the ECU 70 proceeds to step 120. On the other hand, if it is determined that it is during cold start, the ECU 70 stops the introduction of the cooling water to the EGR cooler 52 (step 110) and proceeds to step 120. Thereby, even if EGR gas is introduced, it is possible to prevent water from freezing inside the ejector 56.
- step 120 the ECU 70 determines whether or not it is during steady running. Specifically, when there is no request for a supercharging response, it is determined that the vehicle is in steady running. When it is determined in this step that the vehicle is in steady running, the ECU 70 proceeds to step 130. On the other hand, when it is determined that the vehicle is not in steady running, the ECU 70 stops the introduction of the cooling water to the EGR cooler 52 (step 140), opens the EGR valve 50 (step 150), and performs PCV to execute the blow-by control. The valve 68 is closed (step 160). As a result, ventilation through the ejector 56 is stopped (step 170).
- step 130 the ECU 70 determines whether or not EGR gas is introduced. If it is determined in this step that the EGR gas is not being introduced, the ECU 70 stops the introduction of the cooling water to the EGR cooler 52 in order to promote ventilation via the PCV passages 58, 60, 64 (step 180). The EGR valve 50 is closed (step 190), and the PCV valve 68 is closed (step 200). Thereby, the ventilation via the ejector 56 is stopped (step 210). On the other hand, if it is determined that EGR gas is being introduced, the ECU 70 introduces cooling water to the EGR cooler 52 (step 220), opens the EGR valve 50 (step 230), and opens the PCV valve 68 (step 240). . Thereby, ventilation via the ejector 56 is executed (step 250).
- the introduction of the cooling water to the EGR cooler 52 is stopped when it is determined that it is during the cold start, so even if the EGR gas is introduced during the cold start. Further, it is possible to prevent water from freezing inside the ejector 56. Further, since ventilation through the ejector 56 is stopped when it is determined that the vehicle is not in steady running, the gas in the crankcase can be prevented from flowing into the exhaust passage 24 during execution of the blow-by control. Further, when it is determined that the EGR gas is not being introduced, the ventilation via the ejector 56 is stopped, so that the ventilation via the PCV passages 58, 60, 64 can be promoted. Further, since ventilation through the ejector 56 is executed during steady running and when EGR gas is being introduced, the gas in the crankcase is sucked from the PCV passage 62 and burned in the engine 10 together with EGR gas and fresh air. it can.
- the ECU 70 executes the process of step 120 in FIG. 9 so that the “blow-through control determination means” in the second invention executes the process of step 160 in FIG.
- the “introduction prohibiting means” in the second invention is realized.
- the EGR cooler 52 corresponds to the “exhaust cooling means” in the fourth invention.
- the ECU 70 executes the process of step 100 in FIG. 9
- the “cold start determining means” in the fourth invention executes the process of step 110 in FIG. “Cooling prohibiting means” is realized.
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Abstract
Description
内燃機関の吸気通路に設けられたコンプレッサと前記内燃機関の排気通路に設けられた排気タービンを備える過給機と、
前記排気タービンよりも上流側の排気通路と前記コンプレッサよりも下流側の吸気通路とを接続する第1迂回通路と、
前記第1迂回通路の途中において、前記内燃機関のシリンダヘッドと前記第1迂回通路とを接続する第1PCV通路と、
前記第1迂回通路と前記第1PCV通路との接続点に設けられ、前記排気タービン上流側における排気通路内圧と、前記コンプレッサ下流側における吸気通路内圧との圧力差によって、前記第1PCV通路を流れるブローバイガスを前記第1迂回通路に導入する第1ガス導入手段と、
を備えることを特徴とする。
前記第1迂回通路を経由して、前記吸気通路から前記排気通路に吸入空気を吹き抜けさせる吹き抜け制御に対する要求の有無を判定する吹き抜け制御判定手段と、
前記吹き抜け制御に対する要求が有ると判定した場合に、前記第1PCV通路を流れるブローバイガスの前記第1迂回通路への導入を禁止する導入禁止手段と、
を備えることを特徴とする。
前記第1PCV通路に設けられ、前記第1PCV通路と前記第1ガス導入手段との接続を許可しまたは禁止するPCVバルブを更に備えることを特徴とする。
前記第1迂回通路に設けられ、前記排気通路から前記吸気通路に還流させる排気を冷却する排気冷却手段と、
前記内燃機関が所定の冷間始動条件下にあるか否かを判定する冷間始動判定手段と、
前記内燃機関が前記所定の冷間始動条件下にあると判定された場合に、前記排気冷却手段による排気の冷却を禁止する冷却禁止手段と、
を備えることを特徴とする。
前記吸気通路において、前記コンプレッサを迂回する第2迂回通路と、
前記第2迂回通路の途中において、前記内燃機関のシリンダヘッドと前記第2迂回通路とを接続する第2PCV通路と、
前記第2迂回通路と前記第2PCV通路との接続点に設けられ、前記コンプレッサ上流側における吸気通路内圧と、前記コンプレッサ下流側における吸気通路内圧との圧力差によって、前記第2PCV通路を流れるブローバイガスを前記第2迂回通路に導入する第2ガス導入手段と、
を備えることを特徴とする。
[換気制御装置の構成]
先ず、図1乃至図8を参照しながら、本発明の実施の形態1について説明する。図1は、本実施形態の換気制御装置のシステム構成を示す図である。図1に示すように、本実施形態のシステムは、内燃機関としてのエンジン10を備えている。エンジン10の気筒数および気筒配置は特に限定されない。エンジン10は、内部にピストン12を有するシリンダブロック14を備えている。シリンダブロック14の上部にはシリンダヘッド16が組み付けられている。シリンダヘッド16は、シリンダヘッドカバー18により覆われている。ピストン12上面からシリンダヘッド16までの空間は燃焼室20を形成している。シリンダヘッド16は、燃焼室20と連通する吸気通路22と、排気通路24とを備えている。
図3は、無過給域におけるブローバイガスの流れを説明するための図である。無過給域においては、スロットルバルブ40下流側の負圧をある程度確保できる。そのため、クランクケース内のガスはシリンダヘッドカバー18、PCV通路58を経由してサージタンク42内に流れ込む。またこのとき、吸気通路22からPCV通路60、シリンダヘッドカバー18を経由して、クランクケース内に新気が流れ込む。
また、上記実施の形態1においては、PCVバルブ68が上記第3の発明における「PCVバルブ」に相当している。
また、上記実施の形態1においては、エアバイパス通路32が上記第5の発明における「第2迂回通路」に、PCV通路64が上記第5の発明における「第2PCV通路」に、エゼクタ36が上記第5の発明における「第5ガス導入手段」に、それぞれ相当している。
[実施の形態2の特徴]
次に、図9を参照しながら、本発明の実施の形態2について説明する。本実施形態においては、上記実施の形態1で説明したシステム構成において、図9のルーチンを実行することをその特徴とする。
また、本実施形態においては、冷間始動直後にEGRガスを導入する場合は、EGRクーラ52でのガス冷却を停止することとした。これにより、エゼクタ56内部において液化により生じた水が凍結することを未然に防止できる。
次に、図9を参照しながら、上述した機能を実現するための具体的な処理について説明する。図9は、本実施形態において、ECU70により実行されるルーチンを示すフローチャートである。なお、図9に示すルーチンは、定期的に繰り返して実行されるものとする。
また、上記実施の形態2においては、EGRクーラ52が上記第4の発明における「排気冷却手段」に相当している。また、ECU70が図9のステップ100の処理を実行することにより上記第4の発明における「冷間始動判定手段」が、同図のステップ110の処理を実行することにより上記第4の発明における「冷却禁止手段」が、それぞれ実現されている。
22 吸気通路
24 排気通路
26 過給機
26a タービン
26b コンプレッサ
30,32 エアバイパス通路
36,56 エゼクタ
36a,56a 吸入口
36b,56b ノズル部
36c,56c ディヒューザ部
48 EGR通路
50 EGRバルブ
52 EGRクーラ
58,60,62,64 PCV通路
66,68 PCVバルブ
70 ECU
Claims (5)
- 内燃機関の吸気通路に設けられたコンプレッサと前記内燃機関の排気通路に設けられた排気タービンを備える過給機と、
前記排気タービンよりも上流側の排気通路と前記コンプレッサよりも下流側の吸気通路とを接続する第1迂回通路と、
前記第1迂回通路の途中において、前記内燃機関のシリンダヘッドと前記第1迂回通路とを接続する第1PCV通路と、
前記第1迂回通路と前記第1PCV通路との接続点に設けられ、前記排気タービン上流側における排気通路内圧と、前記コンプレッサ下流側における吸気通路内圧との圧力差によって、前記第1PCV通路を流れるブローバイガスを前記第1迂回通路に導入する第1ガス導入手段と、
を備えることを特徴とする内燃機関の換気制御装置。 - 前記第1迂回通路を経由して、前記吸気通路から前記排気通路に吸入空気を吹き抜けさせる吹き抜け制御に対する要求の有無を判定する吹き抜け制御判定手段と、
前記吹き抜け制御に対する要求が有ると判定した場合に、前記第1PCV通路を流れるブローバイガスの前記第1迂回通路への導入を禁止する導入禁止手段と、
を備えることを特徴とする請求項1に記載の内燃機関の換気制御装置。 - 前記第1PCV通路に設けられ、前記第1PCV通路と前記第1ガス導入手段との接続を許可しまたは禁止するPCVバルブを更に備えることを特徴とする請求項1または2に記載の内燃機関の換気制御装置。
- 前記第1迂回通路に設けられ、前記排気通路から前記吸気通路に還流させる排気を冷却する排気冷却手段と、
前記内燃機関が所定の冷間始動条件下にあるか否かを判定する冷間始動判定手段と、
前記内燃機関が前記所定の冷間始動条件下にあると判定された場合に、前記排気冷却手段による排気の冷却を禁止する冷却禁止手段と、
を備えることを特徴とする請求項1乃至3何れか1項に記載の内燃機関の換気制御装置。 - 前記吸気通路において、前記コンプレッサを迂回する第2迂回通路と、
前記第2迂回通路の途中において、前記内燃機関のシリンダヘッドと前記第2迂回通路とを接続する第2PCV通路と、
前記第2迂回通路と前記第2PCV通路との接続点に設けられ、前記コンプレッサ上流側における吸気通路内圧と、前記コンプレッサ下流側における吸気通路内圧との圧力差によって、前記第2PCV通路を流れるブローバイガスを前記第2迂回通路に導入する第2ガス導入手段と、
を備えることを特徴とする請求項1乃至4何れか1項に記載の内燃機関の換気制御装置。
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US13/981,188 US8960167B2 (en) | 2011-10-31 | 2011-10-31 | Ventilation control apparatus for internal combustion engine |
CN201180074614.9A CN103906901B (zh) | 2011-10-31 | 2011-10-31 | 内燃机的换气控制装置 |
JP2013524669A JP5527486B2 (ja) | 2011-10-31 | 2011-10-31 | 内燃機関の換気制御装置 |
EP11875140.3A EP2775111B1 (en) | 2011-10-31 | 2011-10-31 | Ventilation control device for internal combustion engine |
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- 2011-10-31 EP EP11875140.3A patent/EP2775111B1/en not_active Not-in-force
- 2011-10-31 JP JP2013524669A patent/JP5527486B2/ja not_active Expired - Fee Related
- 2011-10-31 WO PCT/JP2011/075105 patent/WO2013065112A1/ja active Application Filing
- 2011-10-31 US US13/981,188 patent/US8960167B2/en not_active Expired - Fee Related
- 2011-10-31 CN CN201180074614.9A patent/CN103906901B/zh not_active Expired - Fee Related
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Cited By (15)
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FR3008141A1 (fr) * | 2013-07-02 | 2015-01-09 | Peugeot Citroen Automobiles Sa | Circuit de gaz de carter d'un moteur thermique muni d'un clapet de regulation, moteur thermique et clapet de regulation correspondants |
CN103397926A (zh) * | 2013-08-15 | 2013-11-20 | 安徽江淮汽车股份有限公司 | 一种增压汽油机的呼吸*** |
FR3016185A1 (fr) * | 2014-01-07 | 2015-07-10 | Peugeot Citroen Automobiles Sa | Moteur a combustion de vehicule automobile a systeme de degazage securise |
CN106414986A (zh) * | 2014-01-22 | 2017-02-15 | 丰田自动车株式会社 | 内燃发动机 |
JP2015137590A (ja) * | 2014-01-22 | 2015-07-30 | トヨタ自動車株式会社 | 内燃機関 |
WO2015111679A1 (en) * | 2014-01-22 | 2015-07-30 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
US10393072B2 (en) | 2014-01-22 | 2019-08-27 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
CN106414986B (zh) * | 2014-01-22 | 2018-09-11 | 丰田自动车株式会社 | 内燃发动机 |
JP2015161180A (ja) * | 2014-02-26 | 2015-09-07 | トヨタ自動車株式会社 | 機関システムの制御装置 |
EP2913491A1 (en) * | 2014-02-26 | 2015-09-02 | Toyota Jidosha Kabushiki Kaisha | Engine system and control method for engine system |
US9988957B2 (en) | 2014-04-17 | 2018-06-05 | Reinz-Dichtungs-Gmbh | Ventilation system for an internal combustion engine |
WO2015158819A1 (en) * | 2014-04-17 | 2015-10-22 | Reinz-Dichtungs-Gmbh | Ventilation system |
FR3020413A1 (fr) * | 2014-04-23 | 2015-10-30 | Renault Sas | Raccord de circuit de reaspiration de gaz de blow-by pour moteur a combustion interne, notamment a essence |
WO2015162345A1 (fr) * | 2014-04-23 | 2015-10-29 | Renault S.A.S. | Raccord de circuit de reaspiration de gaz de blow-by pour moteur a combustion interne, notamment a essence |
JP2017040176A (ja) * | 2015-08-18 | 2017-02-23 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2775111A4 (en) | 2015-07-15 |
CN103906901A (zh) | 2014-07-02 |
EP2775111A1 (en) | 2014-09-10 |
US20140224232A1 (en) | 2014-08-14 |
JP5527486B2 (ja) | 2014-06-18 |
US8960167B2 (en) | 2015-02-24 |
CN103906901B (zh) | 2016-04-27 |
JPWO2013065112A1 (ja) | 2015-04-02 |
EP2775111B1 (en) | 2016-08-17 |
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