WO2014128877A1 - ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置 - Google Patents
ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置 Download PDFInfo
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- WO2014128877A1 WO2014128877A1 PCT/JP2013/054315 JP2013054315W WO2014128877A1 WO 2014128877 A1 WO2014128877 A1 WO 2014128877A1 JP 2013054315 W JP2013054315 W JP 2013054315W WO 2014128877 A1 WO2014128877 A1 WO 2014128877A1
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- Prior art keywords
- passage
- diffuser
- supercharger
- intake
- temperature gas
- Prior art date
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Classifications
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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
- F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
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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
-
- 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
-
- 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
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/005—Cooling of pump drives
-
- 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
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/16—Other safety measures for, or other control of, pumps
-
- 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
- F02M26/06—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
- 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
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
-
- 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
-
- 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
-
- 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
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/16—Other safety measures for, or other control of, pumps
- F02B2039/162—Control of pump parameters to improve safety thereof
- F02B2039/164—Control of pump parameters to improve safety thereof the temperature of the pump, of the pump drive or the pumped fluid being limited
-
- 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
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/16—Other safety measures for, or other control of, pumps
- F02B2039/162—Control of pump parameters to improve safety thereof
- F02B2039/166—Control of pump parameters to improve safety thereof the fluid pressure in the pump or exhaust drive being limited
-
- 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 cooling device for a supercharger of an internal combustion engine equipped with a blow-by gas recirculation device.
- Patent Document 1 describes a system that ventilates a crankcase by recirculating blowby gas leaked from a combustion chamber of an internal combustion engine (hereinafter referred to as “engine”) into the crankcase into an intake passage.
- engine an internal combustion engine
- This system is also called blow-by gas recirculation device or PCV (positive crankcase ventilation).
- JP 2007-187033 A Japanese Patent Laid-Open No. 8-14056
- the oil scatters due to the crankshaft rotating at a high speed and the in-cylinder gas ejected between the piston ring and the inner peripheral wall surface of the cylinder bore.
- oil mist that is, liquid fine particles of lubricating oil
- the engine includes a supercharger
- the oil mist is returned to the intake passage together with the blowby gas by the blowby gas recirculation device, the oil mist flows into the compressor of the supercharger.
- the temperature of the intake air discharged from the impeller of the compressor rises due to the compression action of the compressor and becomes high.
- an object of the present invention is to suppress the generation or accumulation of deposits in the compressor.
- the present invention relates to a cooling device for a supercharger of an internal combustion engine equipped with a blow-by gas recirculation device.
- the cooling device of the present invention includes a low temperature gas introducing means.
- the blow-by gas recirculation device is configured to introduce blow-by gas upstream of the compressor of the supercharger.
- the low temperature gas introduction means is configured to introduce a low temperature gas into the diffuser passage of the compressor.
- the low-temperature gas is a gas having a temperature lower than the temperature of the intake air that is discharged from the impeller of the compressor and flows into the diffuser passage.
- the low temperature gas introduction means is configured to introduce the low temperature gas into the diffuser passage at an acute angle with respect to the flow direction of the intake air flowing through the diffuser passage.
- the low temperature gas is introduced into the diffuser passage. Therefore, the intake air discharged from the compressor impeller is cooled by the low temperature gas. As a result, the oil mist in the intake air is suppressed from being exposed to a high temperature. For this reason, generation
- the low temperature gas is introduced into the diffuser passage at an acute angle with respect to the flow direction of the intake air flowing in the diffuser passage. Therefore, a low-temperature gas layer is formed between the intake air discharged from the impeller and the diffuser wall surface. This reduces the amount of heat that the intake air receives from the diffuser wall surface. Therefore, an increase in the temperature of intake air discharged from the impeller is suppressed. For this reason, generation
- the low temperature gas introduction means has a low temperature gas introduction passage, and the low temperature gas introduction passage opens from the diffuser wall surface defining the diffuser passage to the diffuser passage, and the low temperature gas introduction passage Is preferably extended at an acute angle with respect to the flow direction of the intake air flowing in the diffuser passage in the vicinity of the diffuser wall surface.
- the low temperature gas introduction passage extends at an acute angle with respect to the flow direction of the intake air flowing in the diffuser passage in the vicinity of the diffuser wall surface. For this reason, a layer of low-temperature gas is formed between the intake air and the diffuser wall surface with a simple configuration.
- the low-temperature gas introduction means is configured to introduce the low-temperature gas into the diffuser passage from the vicinity of the intake discharge area of the impeller of the compressor.
- the low temperature gas introduction means introduces the intake air cooled by the intercooler into the diffuser passage as a low temperature gas.
- FIG. 1st embodiment of an internal-combustion engine provided with a blowby gas recirculation device It is a figure which shows the compressor of the supercharger of the internal combustion engine of 1st Embodiment. It is a figure which shows the internal combustion engine of 2nd Embodiment. It is a figure which shows the control flow of the flow control valve of 2nd Embodiment. It is a figure which shows the internal combustion engine of 3rd Embodiment. It is a figure which shows the control flow of the flow control valve of 3rd Embodiment.
- the internal combustion engine described below is a piston reciprocating compression self-ignition internal combustion engine (so-called diesel engine).
- diesel engine piston reciprocating compression self-ignition internal combustion engine
- the present invention is also applicable to other types of internal combustion engines.
- deposit means a deposit generated due to oil mist during intake.
- the internal combustion engine of the first embodiment is shown in FIG.
- the compressor of the supercharger of the first embodiment is shown in FIG.
- the internal combustion engine (hereinafter “engine”) 10 includes an engine body 20, an intake passage 30, and an exhaust passage 40.
- the engine body 20 includes a crankcase 21, an oil pan 22, a cylinder block 23, and a cylinder head 24.
- the crankcase 21 rotatably supports the crankshaft 21A.
- the oil pan 22 is fixed to the crankcase 21 below the crankcase 21.
- the oil pan 22 together with the crankcase 21 forms a space (hereinafter referred to as “crankcase chamber”) for accommodating the crankshaft 21A and the lubricating oil OL.
- the cylinder block 23 is fixed to the crankcase 21 above the crankcase 21.
- the cylinder block 23 is made of aluminum.
- the cylinder block 23 includes a plurality (four in the first embodiment) of hollow cylindrical cylinder bores 23A.
- a cast iron cylinder liner 23B is fitted into the inner periphery of the cylinder bore 23A.
- a piston 23C is accommodated in the cylinder bore 23A (in particular, the cylinder liner 23B in the first embodiment).
- Piston 23C is substantially cylindrical. Piston 23C is provided with a plurality of piston rings on its side surface.
- the lowermost ring (that is, the crankcase 21 side) of the plurality of piston rings is a so-called oil ring OR.
- the oil ring OR slides on the inner peripheral wall surface of the cylinder bore 23A (in the first embodiment, in particular, the inner peripheral wall surface of the cylinder liner 23B), and the lubricating oil on the inner peripheral wall surface (in other words, an oil film) ) Is scraped off to the crankcase 21 side.
- the piston 23C is connected to the crankshaft 21A by a connecting rod 23D.
- the upper wall surface (ie, the top wall surface) of the piston 23C forms a combustion chamber CC together with the inner peripheral wall surface of the cylinder liner 23B and the lower wall surface of the cylinder head 24.
- the cylinder head 24 is fixed to the cylinder block 23 above the cylinder block 23.
- the cylinder head 24 is formed with an intake port and an exhaust port communicating with the combustion chamber CC.
- the intake port is opened and closed by an intake valve.
- the intake valve is driven by a cam (not shown) of an intake cam shaft housed in the cylinder head 24.
- the exhaust port is opened and closed by an exhaust valve.
- the exhaust valve is driven by a cam (not shown) of an exhaust cam shaft housed in the cylinder head 24.
- the cylinder head 24 is covered with a cylinder head cover 24A.
- a fuel injection valve (not shown) is provided in the cylinder head 24.
- the intake passage 30 is generally composed of an intake pipe 31, an intercooler 32, a compressor 61 of a supercharger 60, and an intake port.
- the intake pipe 31 is connected to the intake port.
- the compressor 61 is interposed in the intake pipe 31.
- the intercooler 32 is interposed in the intake pipe 31 downstream of the compressor 61.
- the exhaust passage 40 is generally composed of an exhaust port, an exhaust pipe 41, and a turbine 62 of the supercharger 60.
- the exhaust pipe 41 is connected to the exhaust port.
- the turbine 62 is interposed in the exhaust pipe 41.
- the turbine 62 is connected to the impeller 63 of the compressor 61 by a shaft.
- the turbine 62 is rotated by the energy of the exhaust gas flowing into it.
- the rotation of the turbine 62 is transmitted to the impeller 63 through the shaft.
- the impeller 63 rotates.
- the intake air is compressed by the rotation of the impeller 63. That is, the supercharger 60 performs supercharging.
- the supercharger 60 is a centrifugal supercharger. That is, the compressor 61 takes in the intake air from the intake intake port 66 along the direction of the rotation axis RA of the impeller 63, compresses the intake air by the rotation of the impeller 63, and compresses the compressed intake air from the impeller 63 in the radial direction. Discharge outward.
- the supercharger 60 has an annular diffuser passage 64. The intake air discharged from the impeller 63 flows into the diffuser passage 64.
- the diffuser passage 64 is generally defined by two diffuser wall surfaces 65A and 65B.
- one diffuser wall surface 65A faces the intake intake port 66 side with respect to the reference plane.
- the other diffuser wall surface 65B is a wall surface on the opposite side of the one diffuser wall surface 65A with respect to the reference surface.
- the blow-by gas recirculation device 50 includes a first passage 51, a second passage 52, and a third passage 53.
- the first passage 51 is formed in the cylinder block 23.
- the first passage 51 connects the crankcase chamber to the second passage 52 in the cylinder head 24.
- the second passage 52 is connected to one end of the third passage 53 through a predetermined path in the cylinder head 24.
- the third passage 53 is constituted by a gas pipe 53A provided outside the engine body 20.
- the other end of the third passage 53 is connected to the intake pipe 31 upstream of the compressor 61.
- Blow-by gas leaked from the combustion chamber CC into the crankcase chamber is recirculated to the intake passage 30 through the first passage 51, the second passage 52, and the third passage 53.
- a known PCV valve may be disposed in the third passage 53 in order to control the amount of blow-by gas recirculated to the intake passage 30.
- the supercharger cooling device of the first embodiment includes a cooling air introduction device.
- the cooling air introduction device has a cooling air introduction passage 70.
- the cooling air introduction passage 70 connects the intake passage 30 downstream of the intercooler 32 to the diffuser passage 64 of the compressor 61.
- the cooling air introduction passage 70 is open to one diffuser wall surface 65A. A part of the cooling air flowing out from the intercooler 32 (that is, the intake air cooled by the intercooler) is introduced into the diffuser passage 64 through the cooling air introduction passage 70.
- the cooling air introduction passage 70 is configured to introduce the cooling air into the diffuser passage 70 at an acute angle with respect to the intake flow direction (that is, the flow direction of the intake air flowing through the diffuser passage 64) IA. That is, the cooling air introduction passage 70 extends at an acute angle with respect to the intake air flow direction IA in the vicinity of the one diffuser wall surface 65A.
- cooling air is introduced from the cooling air introduction passage 70 into the diffuser passage 64. Therefore, the intake air discharged from the impeller 63 is cooled by the cooling air. As a result, the oil mist in the intake air is suppressed from being exposed to a high temperature. For this reason, generation
- the cooling air is introduced into the diffuser passage 64 at an acute angle with respect to the intake flow direction IA. Accordingly, a cooling air layer is formed between the intake air discharged from the impeller 63 and the diffuser wall surface 65A. This reduces the amount of heat that the intake air receives from the diffuser wall surface 65A. Therefore, an increase in the discharge temperature (that is, the temperature of the gas discharged from the impeller 63, and the temperature of the intake air discharged from the impeller 63 in the first embodiment) is suppressed. For this reason, generation
- the diffuser Deposit accumulation on the wall surface 65A is suppressed by the cooling air layer.
- the cooling air is introduced from the cooling air introduction passage 70 to the diffuser passage 64 substantially along the intake air flow direction IA. Therefore, the occurrence of intake air turbulence due to the introduction of the cooling air into the diffuser passage 64 is suppressed. For this reason, the fall of the supercharging efficiency of the supercharger 60 by introduction of the cooling air to the diffuser passage 64 is suppressed.
- a gas other than the cooling air may be employed as the introduction gas (that is, the gas introduced into the diffuser passage 64).
- the introduction gas including the cooling air is a gas that is at least low enough to lower the temperature of the diffuser wall surface 65A. That is, the temperature of the introduced gas including the cooling air is preferably at least lower than the temperature of the diffuser wall surface 65A.
- the temperature of the introduced gas including the cooling air is preferably lower than the temperature of the intake air discharged from the impeller of the compressor and flowing into the diffuser passage.
- the angle of the cooling air introduction passage 70 with respect to the intake air flow direction IA is not limited to a specific angle, but preferably an angle at which a layer of cooling air is formed on the diffuser wall surface 65A to a desired degree.
- the angle is such that the turbulence generated in the intake air flowing through the diffuser passage 64 is suppressed to a desired level, and more preferably, the angle is close to zero.
- the position at which the cooling air is introduced into the diffuser passage 64 is not limited to a specific position, but is preferably a position in the vicinity of the intake discharge region (that is, the region where intake air is discharged from the impeller 63). It is.
- the cooling air introduction passage 70 may be opened not only on the one diffuser wall surface 65A but also on the other diffuser wall surface 65B. In the first embodiment, the cooling air introduction passage 70 may open to the other diffuser wall surface 65B instead of opening to the one diffuser wall surface 65A.
- Second Embodiment A second embodiment will be described.
- the internal combustion engine of the second embodiment is shown in FIG.
- the second embodiment is different from the first embodiment in that the cooling air introduction device has a flow control valve.
- Other configurations of the second embodiment are the same as those of the first embodiment.
- the flow control valve 71 is disposed in the cooling air introduction passage 70.
- the amount of cooling air introduced from the cooling air introduction passage 70 into the diffuser passage 64 can be controlled by the flow control valve 71.
- the opening degree of the flow control valve 71 is determined according to the discharge temperature. More specifically, the opening degree of the flow control valve 71 is increased as the discharge temperature is higher. Note that the larger the opening degree of the flow control valve 71, the larger the amount of introduced cooling air (that is, the amount of cooling air introduced from the cooling air introduction passage 70 into the diffuser passage 64).
- the introduced cooling air amount is an amount corresponding to the discharge temperature, it is possible to more reliably achieve deposit generation suppression and the like.
- the discharge temperature depends on the intake air amount (that is, the amount of air sucked into the combustion chamber CC) and the supercharging pressure (that is, the pressure of the gas after being compressed by the compressor 61, that is, the intake passage downstream of the compressor 61). The pressure within 30). More specifically, the discharge temperature tends to increase as the intake air amount increases, and the discharge temperature tends to increase as the supercharging pressure increases. Therefore, in the second embodiment, the intake air amount, the supercharging pressure, or a combination thereof may be employed as a parameter representing the discharge temperature.
- the opening degree of the flow control valve 71 is increased as the intake air amount increases.
- the opening degree of the flow control valve 71 is increased as the supercharging pressure is increased.
- the opening degree of the flow control valve 71 is increased as the intake air amount is increased, and the opening degree of the flow control valve 71 is increased as the supercharging pressure is increased. .
- FIG. 4 A control flow of the flow control valve of the second embodiment will be described. An example of this control flow is shown in FIG.
- step 200 the intake air amount Ga and the supercharging pressure Pim are acquired.
- step 201 the target opening degree TDfr of the flow control valve 71 is calculated based on the intake air amount Ga and the intake pressure Pim acquired at step 200.
- step 202 the opening degree Dfr of the flow control valve 71 is controlled so that the target opening degree TDfr calculated in step 201 is achieved, and then the flow ends.
- FIG. 3 The internal combustion engine of the third embodiment is shown in FIG.
- the third embodiment differs from the second embodiment in that the internal combustion engine has an exhaust gas recirculation device.
- Other configurations of the third embodiment are the same as those of the second embodiment.
- the exhaust gas recirculation device (hereinafter referred to as “EGR device”) 90 is a device that introduces exhaust gas into the intake passage 30.
- the EGR device 90 includes an exhaust gas recirculation passage (hereinafter referred to as “EGR passage”) 91 and an exhaust gas recirculation control valve (hereinafter referred to as “EGR valve”) 92.
- the EGR passage 91 directly connects the exhaust passage 40 downstream of the turbine 62 and the intake passage 30 upstream of the compressor 61.
- the EGR valve 92 is disposed in the EGR passage 91.
- the EGR valve 92 can control the flow rate of the exhaust gas flowing through the EGR passage 91.
- EGR execution conditions that is, engine operating conditions for executing the introduction of exhaust gas into the intake passage 30 by the EGR device 90
- EGR that is, introduction of exhaust gas into the intake passage 30 by the EGR device 90
- the opening degree of the EGR valve 92 at the time of EGR execution is determined in advance according to the engine operating state.
- the opening degree of the EGR valve 92 is controlled to an opening degree that is determined according to the engine operating state.
- the opening degree of the flow control valve 71 is determined according to the discharge temperature (that is, the temperature of the gas discharged from the impeller 63).
- the discharge temperature changes according to the intake air amount, the supercharging pressure, and the EGR gas amount. More specifically, the discharge temperature tends to increase as the intake air amount increases, the discharge temperature tends to increase as the boost pressure increases, and the discharge temperature tends to increase as the EGR gas amount decreases. Therefore, in the third embodiment, an intake air amount, a supercharging pressure, an EGR gas amount, or a combination thereof may be employed as a parameter representative of the discharge temperature.
- the opening degree 71 of the flow control valve is increased as the intake air amount increases.
- the opening degree of the flow control valve 71 is increased as the supercharging pressure is increased.
- the opening degree of the flow control valve 71 is increased as the EGR gas amount is decreased.
- the opening degree of the flow control valve 71 is increased as the intake air amount is increased, and the higher the supercharging pressure is increased.
- the opening degree of the flow control valve 71 is increased. The smaller the EGR gas amount is, the larger the opening degree of the flow control valve 71 is.
- the opening degree of the EGR valve 72 may be adopted as a parameter representing the discharge temperature instead of adopting the EGR gas amount.
- FIG. 6 Control Flow of Flow Control Valve of Third Embodiment
- An example of this control flow is shown in FIG.
- the flow of FIG. 6 starts, first, in step 300, the intake air amount Ga, the supercharging pressure Pim, and the EGR gas amount Aegr are acquired.
- the target opening degree TDfr of the flow control valve 71 is calculated based on the intake air amount Ga, the intake pressure Pim, and the EGR gas amount Aegr acquired at step 300.
- step 302 the opening degree Dfr of the flow control valve 71 is controlled so that the target opening degree TDfr calculated in step 301 is achieved, and then the flow ends.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Supercharger (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
第1実施形態について説明する。第1実施形態の内燃機関が図1に示されている。第1実施形態の過給機のコンプレッサが図2に示されている。内燃機関(以下「機関」)10は機関本体20と、吸気通路30と、排気通路40とを具備する。機関本体20はクランクケース21と、オイルパン22と、シリンダブロック23と、シリンダヘッド24とを有する。クランクケース21はクランクシャフト21Aを回転可能に支持している。オイルパン22はクランクケース21の下方においてクランクケース21に固定されている。そして、オイルパン22はクランクケース21とともにクランクシャフト21Aおよび潤滑油OLを収容する空間(以下「クランクケース室」)を形成している。
第1実施形態の過給機の冷却装置について説明する。第1実施形態の冷却装置は冷却空気導入装置からなる。冷却空気導入装置は冷却空気導入通路70を有する。冷却空気導入通路70はインタークーラ32よりも下流の吸気通路30をコンプレッサ61のディフューザ通路64に接続する。冷却空気導入通路70は一方のディフューザ壁面65Aに開口している。インタークーラ32から流出する冷却空気(すなわち、インタークーラによって冷却された吸気)の一部が冷却空気導入通路70を介してディフューザ通路64に導入される。冷却空気導入通路70は吸気流方向(すなわち、ディフューザ通路64内を流れる吸気の流方向)IAに対して鋭角に冷却空気をディフューザ通路70に導入するように構成されている。すなわち、冷却空気導入通路70は一方のディフューザ壁面65Aの近傍において吸気流方向IAに対して鋭角に延在している。
第1実施形態によれば、冷却空気導入通路70からディフューザ通路64に冷却空気が導入される。したがって、インペラ63から吐出される吸気が冷却空気によって冷却される。これによって、吸気中のオイルミストが高温に晒されることが抑制される。このため、吸気中のオイルミストに起因するデポジットの発生が抑制される。
第2実施形態について説明する。第2実施形態の内燃機関が図3に示されている。第2実施形態は冷却空気導入装置が流量制御弁を有している点で第1実施形態とは異なっている。第2実施形態のその他の構成は第1実施形態のものと同じである。
第2実施形態によれば、導入冷却空気量が吐出温度に応じた量であるので、デポジット発生抑制などをより確実に達成可能である。
第2実施形態の流量制御弁の制御フローについて説明する。この制御フローの一例が図4に示されている。図4のフローが開始すると、始めに、ステップ200において、吸気量Gaと過給圧Pimとが取得される。次いで、ステップ201において、ステップ200で取得された吸気量Gaと吸気圧Pimとに基づいて流量制御弁71の目標開度TDfrが算出される。次いで、ステップ202において、ステップ201で算出された目標開度TDfrが達成されるように流量制御弁71の開度Dfrが制御され、その後、フローが終了する。
第3実施形態について説明する。第3実施形態の内燃機関が図5に示されている。第3実施形態は内燃機関が排気再循環装置を有している点で第2実施形態とは異なっている。第3実施形態のその他の構成は第2実施形態のものと同じである。
第3実施形態によれば、導入冷却空気量が吐出温度に応じた量であるので、EGR実行時であっても、デポジット発生抑制などをより確実に達成可能である。
第3実施形態の流量制御弁の制御フローについて説明する。この制御フローの一例が図6に示されている。図6のフローが開始すると、始めに、ステップ300において、吸気量Gaと過給圧PimとEGRガス量Aegrとが取得される。次いで、ステップ301において、ステップ300で取得された吸気量Gaと吸気圧PimとEGRガス量Aegrとに基づいて流量制御弁71の目標開度TDfrが算出される。次いで、ステップ302において、ステップ301で算出された目標開度TDfrが達成されるように流量制御弁71の開度Dfrが制御され、その後、フローが終了する。
Claims (4)
- ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置において、低温ガス導入手段を具備し、前記ブローバイガス環流装置が前記過給機のコンプレッサの上流にブローバイガスを導入するように構成されており、前記低温ガス導入手段が前記コンプレッサのディフューザ通路に低温ガスを導入するように構成されており、前記低温ガスが前記コンプレッサのインペラから吐出されて前記ディフューザ通路に流入する吸気の温度よりも温度の低いガスであり、前記低温ガス導入手段が前記ディフューザ通路内を流れる吸気の流方向に対して鋭角に低温ガスを前記ディフューザ通路に導入するように構成されている内燃機関の過給機の冷却装置。
- 前記低温ガス導入手段が低温ガス導入通路を有し、該低温ガス導入通路が前記ディフューザ通路を画成するディフューザ壁面から前記ディフューザ通路に開口しており、前記低温ガス導入通路が前記ディフューザ壁面近傍において前記ディフューザ通路内を流れる吸気の流方向に対して鋭角に延在している請求項1に記載の内燃機関の過給機の冷却装置。
- 前記低温ガス導入手段が前記コンプレッサのインペラの吸気吐出領域近傍から前記ディフューザ通路に低温ガスを導入するように構成されている請求項1または2に記載の内燃機関の過給機の冷却装置。
- 前記低温ガス導入手段がインタークーラによって冷却された吸気を低温ガスとして前記ディフューザ通路に導入する請求項1~3のいずれか1つに記載の内燃機関の過給機の冷却装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US14/769,254 US20150377118A1 (en) | 2013-02-21 | 2013-02-21 | Cooling device for turbocharger of internal combustion engine provided with blowby gas recirculation device (as amended) |
PCT/JP2013/054315 WO2014128877A1 (ja) | 2013-02-21 | 2013-02-21 | ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置 |
CN201380073598.0A CN105143636B (zh) | 2013-02-21 | 2013-02-21 | 具备窜缸混合气环流装置的内燃机的增压器的冷却装置 |
EP13875928.7A EP2960464A4 (en) | 2013-02-21 | 2013-02-21 | COOLING DEVICE OF A TURBOCHARGER OF A COMBUSTION ENGINE WITH VENTILATION VIA A GAS CIRCULATION DEVICE |
JP2015501150A JP6015843B2 (ja) | 2013-02-21 | 2013-02-21 | ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置 |
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PCT/JP2013/054315 WO2014128877A1 (ja) | 2013-02-21 | 2013-02-21 | ブローバイガス環流装置を備えた内燃機関の過給機の冷却装置 |
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WO2014128877A1 true WO2014128877A1 (ja) | 2014-08-28 |
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US (1) | US20150377118A1 (ja) |
EP (1) | EP2960464A4 (ja) |
JP (1) | JP6015843B2 (ja) |
CN (1) | CN105143636B (ja) |
WO (1) | WO2014128877A1 (ja) |
Cited By (1)
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CN106812597A (zh) * | 2015-11-27 | 2017-06-09 | 长城汽车股份有限公司 | 蜗轮增压器结构和发动机总成 |
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- 2013-02-21 US US14/769,254 patent/US20150377118A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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JPWO2014128877A1 (ja) | 2017-02-02 |
EP2960464A4 (en) | 2016-02-10 |
EP2960464A1 (en) | 2015-12-30 |
US20150377118A1 (en) | 2015-12-31 |
CN105143636B (zh) | 2018-01-09 |
CN105143636A (zh) | 2015-12-09 |
JP6015843B2 (ja) | 2016-10-26 |
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