JP2012251615A - Flow passage switching valve, internal combustion engine, and egr method of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow passage switching valve which quickly and selectively switches a plurality of inlet-side flow passages to lead to an outlet-side flow passage by using relatively high-pressure driving gas, and prevents breakage of a seal member for sealing the flow passages, and to provide an internal combustion engine, and an EGR (Exhaust Gas Recirculation) method of the internal combustion engine.SOLUTION: The flow passage switching valve 50A selectively opens/closes one or more of a plurality of inlet-side flow passages 51a, 51b to lead to a single or multiple outlet-side flow passages 52a. A shutter member 55 is provided which slides between the inlet-side flow passages 51a, 51b-side and the outlet-side flow passage 52a-side provided in the case 54. A seal member is arranged between the shutter member 55 and the case 54 for sealing the outlet-side flow passage 52a. A guide member 53 is provided to slide the shutter member 55 above an inner wall surface of the outlet-side flow passage 52a side of the case 54. A space P is formed between the shutter member 55 and the inner wall surface.

Description

  The present invention relates to a flow path switching valve capable of switching at high speed between a flow path of a high-pressure side gas and a flow path of a low-pressure side gas using a high-pressure gas for driving, an internal combustion engine including the same, and an internal combustion engine It relates to the EGR method.

  In EGR (exhaust gas recirculation) for reducing NOx (nitrogen oxide) in exhaust gas of an internal combustion engine such as a diesel engine, there are a high pressure EGR method and a low pressure EGR method in an internal combustion engine equipped with a supercharging system. In this high pressure EGR system, for example, as shown in FIG. 29, in an internal combustion engine 1X equipped with a high pressure EGR system, an EGR passage 17 is provided closer to the engine body 11 than the turbocharger 14, and the engine body The EGR gas Ge is recirculated from the 11 exhaust manifolds 11 b to the intake manifold 11 a via the EGR passage 17. In the low pressure EGR system, for example, as shown in FIG. 30, in the internal combustion engine 1Y provided with the low pressure EGR system, an EGR passage 17 is provided on the opposite side of the engine body 11 from the turbocharger 14. The EGR gas Ge is recirculated from the downstream side of the turbine 14b to the upstream side of the compressor 14a via the EGR passage 17.

  In any of these EGR systems, the MAF control system is generally used to control the amount of EGR gas. In this MAF control method, if the amount of fresh air (air amount) sucked into the cylinder of the engine without EGR is Mo and the amount of fresh air sucked into the cylinder by performing EGR is Me, it is recirculated. Since the EGR gas amount Megr is Megr = Mo−Me, the EGR gas amount Megr is controlled by controlling the fresh air amount Me based on the valve opening degree of the EGR valve 21 based on this.

  That is, based on the data map of the fresh air amount Me created by setting the fresh air amount Me for each engine operating state in advance using the engine rotational speed Ne and the fuel load Q as parameters, The target fresh air amount Met is calculated from the rotational speed Ne and the fuel load Q, and the actual fresh air amount Me is controlled to become the target fresh air amount Met, thereby controlling the EGR gas amount Megr. Yes.

  However, when a turbocharger is used, the exhaust gas energy (enthalpy) is used for supercharging, so it is impossible to eliminate the response delay (turbo lag) of the turbocharger. The MAF control method has the following problems due to the turbo lag. In a transient operation state in which the load increases rapidly due to the turbo lag, the supercharging pressure does not increase to the pressure set during steady operation, so the intake air amount of the engine decreases. In other words, even an engine with a turbo-type supercharger has the same intake air amount as a non-supercharged engine.

  Therefore, the target EGR amount set in the steady operation condition cannot be achieved, and as shown in FIG. 31, the NOx emission amount increases when performing a rapid transient operation. Further, in order to limit the amount of soot generated, smoke limit control is performed in which the amount of fuel input is suppressed within a region where the soot does not increase when the supercharging pressure does not rise above a certain level. As a result, as shown in FIGS. 32 and 33, both the fuel injection amount Q and the air amount (Mo, Me) are suppressed as indicated by dotted lines, and there is a problem that power during acceleration is suppressed. For this reason, during transient operation in which the load increases rapidly during acceleration or the like, an increase in NOx emissions and a deterioration in fuel consumption occur.

  On the other hand, in the case of using a mechanical supercharger that performs supercharging by directly driving the supercharger by an engine crankshaft or the like, the delay in the supercharging response can be eliminated, but the engine speed is determined. However, there is a problem that fuel efficiency deteriorates because the amount of supercharging is determined regardless of the amount of fuel and the amount of work required for driving is large.

  As a countermeasure, in recent years, an internal combustion engine 1Z having a storage gas supply system as shown in FIG. 34 has been studied, and in this storage gas supply system, a part Gp of the exhaust gas G discharged from the internal combustion engine 1Z. The mixed gas C mixed with air Aa is compressed by a positive displacement compressor (exhaust compressor) 25 to increase the pressure, and the increased mixed gas C is stored in a gas storage container (pressure container) 27 to release electromagnetic waves in a transient state. The valve 36 is opened and the mixed gas C is discharged to the intake passage 12 downstream of the intake valve (intake throttle) 35 via the pressure regulating valve 29, whereby the amount of intake air into the cylinder of the internal combustion engine 1Z is supercharged. There has been proposed a supercharging control device that increases the same level as an attached engine, reduces NOx by the effect of EGR, and solves the problem of turbo lag (see, for example, Patent Document 1).

  When this storage gas supply system is adopted, the supercharging pressure is increased by releasing the gas mixture C pressurized during the transition into the intake passage 12 of the engine 1Z, thereby increasing the amount of air into the cylinder. Can increase the amount of fuel. As a result, acceleration performance is improved and soot discharge can be suppressed. Further, since the supercharging pressure is higher than the internal pressure of the exhaust manifold 11b, the pumping loss of the internal combustion engine 1Z is reduced, and the fuel efficiency can be improved.

  One of the technically most important points in this gas storage supply system is that at the junction of the gas storage supply passage side and the intake passage, the communication between the gas storage supply passage side and the downstream side of the intake passage leads to the intake passage. There is a flow path switching valve for switching to the communication between the upstream side and the downstream side of the intake passage, or conversely.

  In this flow path switching valve, when supplying pressurized gas from the gas storage container into the engine cylinder, it is necessary to securely close the upstream side of the intake passage, and the valve on the storage gas supply passage side opens. When the valve on the upstream side of the intake passage does not close at high speed when it is discharged, that is, the longer the two valves are open at the same time, the longer the pressurized gas will flow through the clearance of the valve on the upstream side of the intake passage. Because it escapes to the atmosphere side, the boost pressure on the downstream side of the intake passage of the engine will not increase.

  In addition, when the supercharging condition using the gas in the gas storage container is released and the state returns to the state where the upstream side of the normal intake passage and the downstream side of the intake passage are in communication, the valve on the storage gas supply passage side is If the valve on the upstream side of the intake passage is not fully opened when closed, the intake resistance on the upstream side of the intake passage will increase and the intake air of the engine will drop significantly. Engine performance deteriorates.

  If these conditions occur when the vehicle accelerates in order to join another lane with the flow path switching valve, the acceleration performance of the vehicle will deteriorate, and this must be avoided. As described above, it is an important issue to switch the two valves that shut off the lines on the storage gas supply passage side and the upstream side of the intake passage at high speed.

  Note that, as the three-way switching valve, for example, there is an integrated switching valve in which a valve body of one driving means and a plurality of three-way switching means is connected and a plurality of valve bodies are moved in conjunction with the driving means (for example, Patent Document 2). reference.).

JP 2011-21558 A JP 2000-193127 A

  On the other hand, the present inventor has obtained the following knowledge. In other words, when the gas storage system is installed in an actual vehicle, it is effective to use a relatively high pressure gas such as compressed air in order to drive the flow path switching valve at a high speed. It is effective to use the gas stored in the gas storage container used for supercharging as the gas to be used.

  In this case, when the gas is supplied from the gas storage gas supply passage into the cylinder of the engine, the pressure in the gas storage container is high, but when the gas supply is finished, the gas in the gas storage container is supplied into the cylinder. Later, since a considerable amount of gas is consumed, the pressure in the gas storage container is lowered to a relatively low pressure.

  Therefore, it is necessary to operate the switching member that performs communication and closing at two locations at high speed even with this low-pressure gas. Note that the high-speed operation described here means that the time from the start of switching between two communication points and closing to the completion of switching is completed in a short time of about 30/1000 seconds (30 ms).

  With regard to this flow path switching valve, the present inventor switches the first flow path and the second flow path as one part of the technology related to the present invention, and either the first flow path side gas or the second flow path side gas. In the flow path switching valve for flowing the first flow path to the third flow path, the first flow path and the second flow path are provided on one side of the case, and the third flow path is provided to the first flow path and the second flow path. Is provided on the other side of the case so as to face both of the first flow path and the third flow path, and alternately communicates between the second flow path and the third flow path. Further, a flow path switching valve is provided which is provided with a shutter member that slides so as to be closed, and is configured to be slid by a piston that is driven by a driving gas.

  However, the shutter member inserted in the case is moved at high speed, and a structure using a shutter member that simultaneously switches between two or more inlet-side channels (ports) applies high pressure to one or more inlet-side channels. In such a case, the shutter member is stopped in a state where it is pressed to one side, and when the shutter member starts to move at a high speed from this stationary state, the shutter member that receives high pressure, as shown in FIGS. Since it remains pressed against the inner wall portion 54g on one side of the case 54, when the end portion of the shutter member 55 passes through the portion of the sealing member 54f such as an O-ring on the same inner wall portion 54g, the sealing member 54f. May be damaged by biting.

  In the case of the storage gas supply system, the damage of the seal member such as the O-ring leads to leakage of gas to be sucked into the cylinder of the engine from the high-pressure storage container into the atmosphere from the intake passage. The supercharging assistance function is lost. Furthermore, the broken pieces of the seal member cause damage to the intake valve of the engine. In addition, when the stored gas supply passage is connected to the upstream side of the compressor of the turbocharger, the blades of the compressor may be damaged.

  The present invention has been made in view of the above situation, and an object of the present invention is to selectively switch a plurality of inlet-side flow paths at high speed to a outlet-side flow path using a relatively high-pressure driving gas. It is possible to communicate with each other and to prevent damage to the seal member that seals the flow path. Using a gas compression device, a part of the exhaust gas, air, and one of these mixed gases are stored in the gas storage container. Used in an internal combustion engine equipped with a pressure-accumulated gas supply system that temporarily suppresses NOx emission during transient operation and improves acceleration performance during transient operation when the load increases rapidly It is in providing the flow-path switching valve which can be performed.

  A further object of the present invention is to prevent reduction in acceleration performance due to turbo lag during sudden acceleration in an internal combustion engine equipped with an accumulator gas supply system, and to reduce PM (particulate matter) and NOx (nitrogen oxide). An internal combustion engine and an EGR method for an internal combustion engine are provided that include the above-described flow path switching valve and can avoid damage to the flow path switching valve and failure of an intake valve and a compressor due to the damage. There is.

  In order to achieve the above object, the flow path switching valve of the present invention selectively connects or blocks any one or a plurality of inlet side flow paths to one or more outlet side flow paths. In the flow path switching valve, the inlet side flow path is provided on one side in the case, and the outlet side flow path is provided on the other side in the case so as to face a part or all of the inlet side flow path. A shutter member that is slid between the inlet-side channel and the outlet-side channel and selectively performs communication and blocking between the inlet-side channel and the outlet-side channel; A gas-driven piston is configured to slide the shutter member, and a seal member is disposed between the shutter member and the case for sealing the outlet-side flow path. On the outlet side flow path side of the case It provided guide members for sliding float from the wall, to form a gap between the shutter member and the inner wall surface.

  According to this configuration, a plurality of inlet-side flow paths can be selectively switched at high speed and communicated with the outlet-side flow path using a relatively high-pressure driving gas. In addition, since the plurality of inlet-side flow paths are alternately opened and closed by one shutter member, it is possible to give a movement at high speed and in which both opening and closing are synchronized. As a result, it is possible to prevent deterioration of the performance of the apparatus provided with this flow path switching valve under the condition of switching a plurality of inlet-side flow paths.

  Therefore, a part of the exhaust gas, air, and any of these mixed gases are stored in a gas storage container using a gas compression device, and the gas is temporarily stored in the cylinder during transient operation when the load increases rapidly. It can be used in an internal combustion engine or the like equipped with a stored gas supply system that suppresses NOx emission during transient operation and improves acceleration performance.

  Further, since the guide member is provided, the contact between the shutter member and the inner wall surface of the case is eliminated, the friction is reduced, the shutter member can be moved at a high speed with less force, and a seal member such as an O-ring is provided. It can be prevented from being damaged.

  The flow path switching valve having a more specific shape of the flow path switching valve includes forming the inlet-side flow path by a first inlet-side flow path and a second inlet-side flow path, and the outlet-side flow path. Is formed by the first outlet side flow path, and the first flow path switching allows the first inlet side flow path and the first outlet side flow path to communicate with each other and the second inlet side flow path and the first flow path. The first outlet side flow path is shut off, and the second flow path switching is used to shut off the first inlet side flow path and the first outlet side flow path and the second inlet side flow path and the It is comprised so that between the 1st exit side flow paths may be connected.

  Alternatively, the inlet side channel is formed by a first inlet side channel, a second inlet side channel, and a third inlet side channel, and the outlet side channel is formed by a first outlet side channel, By switching one channel, the second inlet port communicates between the first inlet side channel and the first outlet side channel and between the third inlet side channel and the first outlet side channel. Between the side flow path and the first outlet side flow path, and by switching the second flow path, between the first inlet side flow path and the first outlet side flow path and the third inlet side flow A path and the first outlet side channel are blocked, and the second inlet side channel and the first outlet side channel are communicated.

  Alternatively, the inlet side channel is formed by a first inlet side channel, a second inlet side channel, and a third inlet side channel, and the outlet side channel is formed by the first outlet side channel and the second outlet side. Formed by a flow path, and by switching the first flow path, between the first inlet-side flow path and the first outlet-side flow path and between the third inlet-side flow path and the second outlet-side flow path. Communicating and blocking between the second inlet side flow path and the first outlet side flow path, and switching between the first inlet side flow path and the first outlet side flow path by switching the second flow path And the third inlet side flow path and the second outlet side flow path are blocked, and the second inlet side flow path and the first outlet side flow path are communicated.

  An internal combustion engine for achieving the above object includes an EGR passage for recirculating a part of the exhaust gas of the internal combustion engine into the cylinder, a part of the exhaust gas of the internal combustion engine, air, and a mixed gas thereof. An internal combustion engine comprising: a gas compression device that compresses any of the gas; a gas storage container that stores the gas compressed by the gas compression device; and a gas storage supply passage that connects the gas storage container and an intake system passage In the engine, the upstream side of the intake system passage is connected to the first inlet-side passage of the passage switching valve, the gas storage supply passage is connected to the second inlet-side passage, and the first outlet A downstream side of the intake system passage is connected to a side flow passage, and the intake system passage and the stored gas supply passage are connected via the flow passage switching valve. The fresh air in the system passage and the EGR gas in the EGR gas passage Is supplied to the exhaust system path, when the internal combustion engine is in a transient operation, it constituted the gas in the gas storage supply passage to temporarily supplied to the intake system passage.

  According to this configuration, the flow path switching valve uses the relatively high pressure driving gas, and the second inlet side flow connected to the first inlet side flow path connected to the upstream intake passage and the stored gas supply passage. The passage can be selectively switched at a high speed to communicate with the first outlet side flow passage connected to the downstream intake passage. Furthermore, by providing the above-described flow path switching valve, it is possible to avoid damage to the flow path switching valve and failure of the intake valve and the compressor due to the damage.

  In the above flow path switching valve, if the gas in the gas storage container is used as the piston driving gas of the flow path switching valve, a device for supplying the piston driving gas is not necessary. Therefore, it is possible to prevent the structure of the internal combustion engine from becoming complicated.

An EGR method for an internal combustion engine for achieving the above object compresses and stores a part of the exhaust gas in the exhaust system passage of the internal combustion engine, air, and any one of these mixed gases, and stores the compressed EGR. so when the internal combustion engine is not in the transient operation, a portion of the exhaust gas of an internal combustion engine via the EGR passage recycled into the cylinder, when the internal combustion engine is in a transient operation, temporarily gas storage previous SL gas In the EGR method of an internal combustion engine that supplies an intake system passage from a supply passage, when the internal combustion engine is not in a transient operation using the flow passage switching valve, the gas is supplied by switching the first flow passage of the flow passage switching valve. When the internal combustion engine is in a transient operation, the fresh air and EGR are switched by the second flow path switching of the flow path switching valve when the flow path switching valve shuts off and supplies fresh air and EGR gas to the intake system passage. Gas is blocked by the flow path switching valve. To a method characterized by temporarily supplying only the gas into the intake system passage.

  According to this method, the flow path switching valve uses a relatively high-pressure driving gas, and the second inlet side flow connected to the first inlet side flow path connected to the upstream intake passage and the stored gas supply passage. The passage can be selectively switched at a high speed to communicate with the first outlet side flow passage connected to the downstream intake passage.

  Therefore, a part of the exhaust gas, air, and any of these mixed gases are stored in a gas storage container using a gas compression device, and the gas is temporarily stored in the cylinder during transient operation when the load increases rapidly. To suppress NOx emission during transient operation and improve acceleration performance. Further, by using the above-described flow path switching valve, it is possible to avoid damage to the flow path switching valve and failure of the intake valve and the compressor due to the damage.

  According to the flow path switching valve according to the present invention, a plurality of inlet side flow paths can be selectively switched at a high speed and communicated with the outlet side flow path using a relatively high pressure driving gas. Breakage of the seal member that seals the path can be prevented.

  In addition, a part of the exhaust gas, air, and any of these mixed gases are stored in a gas storage container using a gas compression device, and the gas is temporarily stored in the cylinder during transient operation when the load increases rapidly. It can be used in an internal combustion engine or the like equipped with a stored gas supply system that suppresses NOx emission during transient operation and improves acceleration performance.

  Further, according to the internal combustion engine and the EGR method of the internal combustion engine according to the present invention, it is possible to prevent a decrease in acceleration performance due to the turbo lag in transient operation such as during rapid acceleration, and PM (particulate matter) and NOx The amount of (nitrogen oxide) discharged can be reduced, and damage to the flow path switching valve and failure of the intake valve and compressor due to this damage can be avoided.

It is a figure which shows the structure of the flow-path switching valve of 1st Embodiment which concerns on this invention, and is a figure which shows the state which the 1st inlet side flow path is connected to the 1st outlet side flow path. It is a figure which shows the state which the 2nd inlet side flow path is connecting with the 1st outlet side flow path by the flow-path switching valve of FIG. FIG. 2 is a cross-sectional plan view showing the X1-X1 cross section of FIG. 1 of the flow path switching valve case of FIG. 1. FIG. 4 is a side sectional view of a portion on the Y1-Y1 side in a Z1-Z1 cross section of FIG. 3 showing a configuration of a guide member. It is a sectional side view of the part by the side of Y1-Y1 in the Z1-Z1 cross section of FIG. 3 which shows another structure of a guide member. It is a top view which shows the structure of the shutter member of a flow-path switching valve. It is Y2-Y2 sectional drawing of FIG. 6 which shows the structure of the shutter member of a flow-path switching valve. It is a cross-sectional view showing the positional relationship between the shutter member and the case when the first inlet-side flow path communicates. It is a cross-sectional view showing the positional relationship between the shutter member and the case when the second inlet side flow path communicates. It is a transverse cross section showing the composition of a piston and a cylinder. It is a figure which shows the structure of a buffer member. It is a figure for demonstrating the drive of a piston. It is a figure which shows the structure of the flow-path switching valve of 2nd Embodiment which concerns on this invention, and shows the state which the 1st inlet side flow path and the 3rd inlet side flow path are connected to the 1st outlet side flow path. FIG. It is a figure which shows the state which the 2nd inlet side flow path is connecting with the 1st outlet side flow path by the flow-path switching valve of FIG. FIG. 14 is a cross-sectional plan view illustrating the X2-X2 cross section of FIG. 13 of the case of the flow path switching valve of FIG. 13. FIG. 16 is a cross-sectional view showing the positional relationship between the shutter member and the case when the first inlet-side flow path and the third inlet-side flow path communicate with each other in the flow path switching valve case of FIG. 15. FIG. 16 is a transverse cross-sectional view showing the positional relationship between the shutter member and the case when the second inlet side flow path communicates in the case of the flow path switching valve in FIG. 15. It is a figure which shows the structure of the flow-path switching valve of 3rd Embodiment which concerns on this invention, a 1st inlet-side flow path is connected to a 1st outlet-side flow path, and a 3rd inlet-side flow path is a 2nd outlet flow. It is a figure which shows the state connected to the path. It is a figure which shows the state which the 2nd inlet side flow path is connecting with the 1st outlet side flow path by the flow-path switching valve of FIG. It is a figure which shows the state which the edge part and shutter member of the shutter member are spaced apart. It is a figure which shows the state which the edge part and shutter member of the shutter member have approached. It is a figure which shows the state which the edge part and shutter member of a shutter member are contacting. It is a figure showing composition of an internal-combustion engine of a 1st embodiment concerning the present invention. It is a figure for demonstrating the drive of the gas compression apparatus for stored gas. It is a figure which shows the structure of the internal combustion engine of 2nd Embodiment which concerns on this invention. It is a figure which shows the structure of the internal combustion engine of 3rd Embodiment which concerns on this invention. It is a figure which shows the structure of the internal combustion engine of 4th Embodiment which concerns on this invention. It is a figure which shows the structure of the internal combustion engine of 5th Embodiment which concerns on this invention. It is a figure which shows the structure of the internal combustion engine of a high pressure EGR system of a prior art. It is a figure which shows the structure of the low pressure EGR type internal combustion engine of a prior art. It is a figure which shows the relationship between the change of a vehicle speed, and instantaneous NOx discharge | emission amount. It is a figure which shows the characteristic of the fuel injection quantity in a full load, and the movement at the time of transition. It is a figure which shows the response delay of the turbo supercharger at the time of transition, and the relationship of EGR. It is a figure which shows the structure of the internal combustion engine of a prior art. It is a figure which shows the state which the edge part and shutter member of the shutter member in the flow-path switching valve of a prior art are spaced apart. It is a figure which shows the state which the edge part and shutter member of the shutter member in the flow-path switching valve of a prior art are approaching. It is a figure which shows the state which the edge part and shutter member of the shutter member in the flow-path switching valve of a prior art are contacting.

  Hereinafter, a flow path switching valve, an internal combustion engine, and an EGR method for an internal combustion engine according to embodiments of the present invention will be described with reference to the drawings.

  First, the flow path switching valve according to the embodiment of the present invention will be described in three embodiments. In the flow path switching valve 50A according to the first embodiment of the present invention, as shown in FIGS. 1 and 2, the inlet-side flow path is formed by a first inlet-side flow path 51a and a second inlet-side flow path 51b. The outlet side flow path is formed by the first outlet side flow path 52a.

  And by the 1st channel change, while connecting between the 1st entrance side channel 51a and the 1st exit side channel 52a, between 2nd entrance side channel 51b and the 1st exit side channel 52a Blocking and switching between the first inlet side flow path 51a and the first outlet side flow path 52a by switching the second flow path and between the second inlet side flow path 51b and the first outlet side flow path 52a It is comprised so that it may communicate. That is, the flow path switching valve 50A of the first embodiment switches between the first inlet side flow path 51a and the second inlet side flow path 51b, and the gas (intake air) A on the first inlet side flow path 51a side. This is a flow path switching valve for flowing one of the gases C on the second inlet flow path 51b side to the first outlet flow path 52a.

  The first inlet side channel 51a and the second inlet side channel 51b are provided on one side in the case 54, and the first outlet side channel 52a is formed between the first inlet side channel 51a and the second inlet side channel 51b. It is provided on the other side in the case 54 so as to face both. At the same time, the first inlet side channel 51a and the first outlet side channel 52a and the second inlet side channel 51b and the first outlet side channel 52a are alternately communicated and closed. A sliding shutter member 55 is provided. The shutter member 55 is configured to be slid by a piston 56 driven by a driving gas Ap. Further, the piston 56 is housed and a cylinder 57 having a first gas chamber 57a and a second gas chamber 57b for driving the piston 56 is provided to constitute a piston drive unit.

  Then, as shown in FIG. 1, the first pressure driving gas Ap is supplied to the second gas chamber 57b and the gas Ae in the first gas chamber 57a is removed, so that the first inlet-side flow path 51a and the first gas are discharged. The first switching operation is performed so as to communicate with the outlet-side channel 52a and to block between the second inlet-side channel 51b and the first outlet-side channel 52a. Further, as shown in FIG. 2, the first inlet side stream is supplied by supplying the driving gas Ap having a second pressure higher than the first pressure to the first gas chamber 57a and removing the gas Ae from the second gas chamber 57b. The second switching operation is performed to block between the path 51a and the first outlet side flow path 52a and to communicate between the second inlet side flow path 51b and the first outlet side flow path 52a.

  As shown in FIG. 3, the case 54 of the flow path switching valve 50A includes a first hole 54a for communicating the first inlet side flow path 51a and the first outlet side flow path 52a, and a second inlet side flow. A second hole 54b for communicating the path 51b and the first outlet side flow path 52a is provided and formed. An O-ring groove 54d and, if necessary, a grease reservoir 54e are provided around the first hole 54a and the second hole 54b, and an O-ring 54f is inserted into the ring groove 54e when assembled. In other words, an O-ring 54 f that is a sealing member is disposed between the shutter member 55 and the case 54 for sealing the first outlet-side flow path 52 a.

  Further, as shown in FIGS. 3, 4, and 5, a guide member 53 for floating and sliding the shutter member 55 from the inner surface (inner wall surface) of the wall 54 g on the first outlet side flow path 52 a side of the case 54. , 53A, and a gap P is formed between the shutter member 55 and the inner surface of the wall 54g.

  In the configuration of FIG. 4, a strip-shaped guide member 53 is provided at a corner in a direction perpendicular to the sliding direction of the shutter member 55, and the shutter member 55 is configured to slide on this upper surface. In another configuration of FIG. 5, a rail-shaped guide member 53A is provided on the wall portion 54h in a direction perpendicular to the sliding direction of the shutter member 55, and the groove portion of the shutter member 55 is engaged with the guide member 53A. And configured to slide.

  In this flow path switching valve 50A, as shown in FIGS. 6 and 7, the shutter member 55 is formed with a through hole 55a. The shutter member 55 is inserted between the cases 54 as shown in FIGS. 8 and 9, and when the shutter member 55 slides to the first flow path switching state as shown in FIG. The end of the member 55 is disconnected from the first hole 54a connected to the first inlet-side flow path 51a to communicate with the first hole 54a, and the shutter member 55 is connected to the second inlet-side flow path 52b. As shown in FIG. 9, when the shutter member 55 slides in the reverse direction and enters the second flow path switching state, the shutter member 55 blocks the first hole 54a. The through hole 55a of the shutter member 55 is configured to overlap the second hole 54b and communicate with the second hole 54b.

  The piston drive unit is for performing high-speed movement of the shutter member 55, and as shown in FIG. 10, includes a piston 57, a cylinder 57 having a first gas chamber 57a and a second gas chamber 57b. The The piston 56 is formed by integrating a piston rod 56a and a pressure receiving portion 56b, and the pressure receiving portion 56b is configured to be slidable in the cylinder 57. Further, in order to seal between the first gas chamber 57a and the second gas chamber 57b, an O-ring groove 56c is provided in the pressure receiving portion 56b, and an O-ring 56d is inserted.

  Further, when the piston 56 moves at a high speed, the gas Ae in the gas chamber 57b (or 57a) is compressed in the gas chamber 57b (or 57a) to which the piston 56 is moved, and the movement of the piston 56 is obstructed. The first gas passage 57c is formed in the first gas chamber 57a, and the second communication passage 57d is formed in the second gas chamber 57b.

  When the piston 56 moves at a high speed, a large inertia force is generated, and a large braking force is required to stop the rod 56a after moving the rod 56a by a necessary stroke, and it is difficult to mechanically stop the rod 56a. For this reason, the buffer member 57e is used as a stopper and disposed inside the first gas chamber 57a and inside the second gas chamber 57b. By causing the pressure receiving portion 56b of the piston 56 to collide with the buffer member 57e, energy required for braking the piston 56 is absorbed by the buffer member 57e and forcibly stopped.

  That is, after moving the shutter member 55 that moves at a high speed by a necessary amount, a large inertial force is applied to the piston 56 and the shutter member 55. Therefore, a buffer member 57e serving as a soft collision portion such as rubber is provided on the non-driving side. The pressure receiving portion 56b is caused to collide with the buffer member 57e and stopped so that the path switching valve 50A is not damaged.

  The buffer member 57e is formed of a soft material such as rubber and is formed in a ring shape as shown in FIG. The buffer member 57e is provided with a notch 57ea at a portion facing the first communication path 57c or the second communication path 57d. The thickness of the soft material such as rubber used for the buffer member 57e is set experimentally.

  In addition, a spring (elastic body) 58 that biases the piston 56 to move toward the first gas chamber 57a is provided, and an elastic force is applied in a direction that assists the movement of the piston 56 during the first switching operation. Rush. Thus, when the first switching operation is performed with the driving gas Ap having a relatively low pressure, the shutter member 55 is slid at the same speed as when the second switching operation is performed with the driving gas Ap having a relatively high pressure. Thus, the flow path can be switched.

  In addition, when a material having a low specific gravity and high strength such as duralumin, super-duralumin, super-super duralumin, or silicon nitride is used for the movable parts such as the shutter member 55 and the piston 56, the shutter member 55 can be formed in a light weight, so that a small drive The flow path can be switched at high speed by sliding the shutter member 55 at high speed with force.

  As shown in FIG. 12, the drive system 60 for driving the piston 56 is configured by providing a gas storage container 61 for storing the drive gas Ap. Further, in order to supply the driving gas Ap to the first gas chamber 57a during the second switching operation, the first driving gas supply path 62, the first three-way valve 63, the first driving gas supply auxiliary path 62a, and the first An air release auxiliary path 62b is provided. Further, in order to supply the driving gas Ap to the second gas chamber 57b during the first switching operation, the second driving gas supply path 64, the second three-way valve 65, the second driving gas supply auxiliary path 64a, and the second An air release auxiliary path 64b is provided.

  Next, the flow path switching valve according to the second embodiment of the present invention will be described. As shown in FIGS. 13 and 14, the flow path switching valve 50B according to the second embodiment is configured such that the inlet side flow path is the first inlet side flow path 51a, the second inlet side flow path 51b, and the third inlet side. The channel 51c is formed, and the outlet channel is formed by the first outlet channel 52a.

  Then, in the first flow path switching, as shown in FIG. 13, between the first inlet side flow path 51a and the first outlet side flow path 52a, the third inlet side flow path 51c, and the first outlet side flow path 52a. 14 and the second inlet side flow path 51b and the first outlet side flow path 52a are blocked, and by switching the second flow path, as shown in FIG. 14, the first inlet side flow path 51a Between the first outlet side flow path 52a, the third inlet side flow path 51c and the first outlet side flow path 52a, and the second inlet side flow path 51b and the first outlet side flow path 52a. Are configured to communicate with each other.

  As shown in FIG. 15, the case 54 of the flow path switching valve 50B includes a first hole 54a for communicating the first inlet side flow path 51a and the first outlet side flow path 52a, and a second inlet side flow. A second hole 54b for communicating the channel 51b and the first outlet side channel 52a, a third hole 54c for communicating the third inlet side channel 51c and the first outlet side channel 52a are provided. To do. An O-ring groove 54d and, if necessary, a grease reservoir 54e are provided around each of the first hole 54a, the second hole 54b, and the third hole 54c, and an O-ring 54f is inserted into the ring groove 54e when assembled. . In other words, an O-ring 54 f that is a sealing member is disposed between the shutter member 55 and the case 54 for sealing the first outlet-side flow path 52 a.

  In this flow path switching valve 50B, the shutter member 55 is formed by providing a through hole 55a, as shown in FIGS. 6 and 7, similar to the flow path switching valve 50A of the first embodiment. The shutter member 55 is inserted between the cases 54 as shown in FIGS. 16 and 17, and when the shutter member 55 slides to the first flow path switching state as shown in FIG. The end of the member 55 is disconnected from the first hole 54a connected to the first inlet-side flow path 51a to communicate with the first hole 54a, and the shutter member 55 is connected to the second inlet-side flow path 52b. The hole 54b is blocked, and further, the first hole 55a of the shutter member 55 overlaps with the third hole 54c connected to the third inlet-side flow path 52c, and communicates with the third hole 54c.

  As shown in FIG. 17, when the shutter member 55 slides in the reverse direction and the second flow path is switched, the shutter member 55 blocks the first hole 54a and the through hole of the shutter member 55. 55a overlaps with the second hole 54b, communicates with the second hole 54b, and the shutter member 55 is configured to block the third hole 54c.

  Except for the configuration described above, the same configuration as the flow path switching valve 50A of the first embodiment is provided, and the same operational effects can be achieved.

  Next, a flow path switching valve according to a third embodiment of the present invention will be described. As shown in FIGS. 18 and 19, the flow path switching valve 50C according to the third embodiment has an inlet side flow path as a first inlet side flow path 51a, a second inlet side flow path 51b, and a third inlet side. The channel 51c is formed, and the outlet channel is formed by the first outlet channel 52a and the second outlet channel 52b.

  The first inlet side channel 51a, the second inlet side channel 51b, and the third inlet side channel 51c are provided on one side in the case 54, and the first outlet side channel 52a is connected to the first inlet side channel 51a. It is provided on the other side in the case 54 so as to face both of the second inlet-side flow paths 51b, and further, the second outlet-side flow path 52b is opposed to the third inlet-side flow path 51c on the other side in the case 54. Provide.

  Then, in the first flow path switching, as shown in FIG. 18, between the first inlet side flow path 51a and the first outlet side flow path 52a, the third inlet side flow path 51c, and the second outlet side flow path 52b. And the second inlet side flow path 51b and the first outlet side flow path 52a are blocked, and by switching the second flow path, as shown in FIG. 19, the first inlet side flow path 51a And the first outlet side flow path 52a, the third inlet side flow path 51c and the second outlet side flow path 52b, and the second inlet side flow path 51b and the first outlet side flow path 52a. Are configured to communicate with each other.

  That is, the flow path switching valve 50C of the third embodiment switches between the first inlet side flow path 51a and the second inlet side flow path 51b, and the gas (intake air) A on the first inlet side flow path 51a side. A flow path switching valve that allows any one of the gas C on the second inlet flow path 51b side to flow to the first outlet flow path 52a and communicates and blocks the gas (EGR gas) Ge in the third inlet flow path 51c. It is.

  Except for the configuration described above, the same configuration as the flow path switching valve 50B of the second embodiment is provided, and the same operational effects can be achieved.

  As described above, the flow path switching valve according to the embodiment of the present invention is the flow path switching valves 50A, 50B, and 50C (hereinafter referred to as 50i) according to the first to third embodiments, Any one or more of the inlet-side flow paths 51a, 51b (or 51a, 51b, 51c: hereinafter referred to as 51i) are selectively used as a single or a plurality of outlet-side flow paths 52a (or 52a, 52b, hereinafter). 52i) is a flow path switching valve that communicates with or shuts off.

  In these flow path switching valves 50 i, the inlet side flow path 51 i is provided on one side in the case 54, and the outlet side flow path 52 i is opposed to part or all of the inlet side flow path 51 i on the other side in the case 54. Provided. At the same time, a shutter member 55 is provided that slides between the inlet-side channel 51i and the outlet-side channel 52i to selectively communicate and block between the inlet-side channel 51i and the outlet-side channel 52i. The shutter member 55 is slid by the piston 58 driven by the driving gas Ap.

  Then, a seal member 54f is disposed between the shutter member 55 and the case 54 for sealing the outlet-side flow path 52i. Further, the shutter member 55 is disposed on the inner surface of the wall 54g on the outlet-side flow path 52i side ( A guide member 53 (or 53A) for floating and sliding from the inner wall surface is provided, and a gap P is formed between the shutter member 55 and the inner surface of the wall 54g.

  Then, with the configuration in which the guide member 53 (or 53A) is provided, the shutter member 55 inserted into the case 54 is moved at a high speed, and the shutters for simultaneously switching the two or more inlet-side flow paths (ports) 51i. When high pressure is applied to one or more inlet-side flow paths 51i in the structure using the member 55, as shown in FIG. 20, the shutter member 55 is stationary while being pressed to one side. Since there is a gap P due to the guide member 53, as shown in FIG. 21, even if the shutter member starts to move at high speed from this stationary state, the shutter member that receives high pressure is in contact with the inner surface of the wall 54g on one side of the case 54. Since there is a gap P between them, there is very little friction, and as shown in FIG. 22, the end of the shutter member 55 is located on the inner surface of the same wall 54g. Even through a portion of the sealing member 54f such as an O-ring which is location no longer pinched seal member 54f, thereby preventing damage to the sealing member 54f.

  Next, engines (internal combustion engines) 1A, 1B, 1C, 1D, and 1E including the flow path switching valve 50i according to the embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 23, the engine 1A of the first embodiment is an engine including the flow path switching valve 50A of the first embodiment, and an intake passage connected to the engine body 11 and the intake manifold 11a. 12 and an exhaust passage 13 connected to the exhaust manifold 11b. The intake manifold 11a and the intake passage 12 form an intake system passage, and the exhaust manifold 11b and the exhaust passage 13 form an exhaust system passage.

  The intake passage 12 is provided with a compressor 14a of a turbocharger 14, and the exhaust passage 13 is provided with a turbine 14b of a turbocharger 14, a diesel particulate filter (DPF) device 15, and a NOx storage reduction catalyst. A NOx purification catalyst 16 formed by the above method is provided.

  Further, the EGR passage 17 is branched from the exhaust passage 13 on the upstream side of the turbine 14b, and is joined to the intake passage 12 on the upstream side of the compressor 14a by the EGR merging portion 18. A diesel particulate filter (DPF) device 19, an EGR cooler 20, and an EGR valve 21 are provided in the EGR passage 17 from the upstream side.

  Further, an exhaust gas introduction passage 22 is provided by branching from the exhaust passage 13 on the downstream side of the NOx purification catalyst 16. The exhaust gas introduction passage 22 is provided with an EGR cooler 23 and a three-way valve 24. The exhaust gas introduction passage 22 is connected to a gas compression device 25 formed by a mechanical positive displacement turbocharger (preferably a reciprocating type). Connecting. The gas compression device 25 is connected to a gas storage container 27 formed of a pressure container or the like through a compressed gas supply passage 26. Further, the gas storage container 27 is connected to the intake passage 12 through a storage gas supply passage 28. The exhaust gas introduction passage 22, the compressed gas supply passage 26 and the stored gas supply passage 28 form a pressure accumulation gas system passage.

  As shown in FIG. 24, the gas compression device 25 transmits power from the axle 31 of the vehicle on which the engine 1 is mounted to the drive shaft of the gas compression device 25 via gears 32 and 33 and an electromagnetic clutch 34. When the electromagnetic clutch 34 is turned on and connected, the gas compression device 25 is driven to compress a part Gp of the exhaust gas G, the air Aa, and any one of these mixed gases C to increase the pressure. Then, the gas is supplied to the gas storage container 27 and stored.

  In addition, as shown in FIG. 23, the pressure regulation valve 29 is arrange | positioned in the stored gas supply path 28, and the pressure of the gas C supplied to 50 A of flow-path switching valves is adjusted. At this time, the three-way valve 24 preferably adjusts the amount of part Gp of the exhaust gas G and the amount of air Aa to keep the oxygen concentration in the gas C stored in the gas storage container 27 substantially constant. Thus, the control when performing EGR can be simplified.

  In order to control the above-described devices, a control device 40 called an engine control unit (ECU) that controls the overall operation of the engine 1 is provided. As shown in FIG. The pressure P0, the engine rotational speed Ne, the accelerator opening degree Ac, and the like in the container 27 are detected, and the electromagnetic clutch 34 and the three-way valve 24 are controlled based on the results to determine the amount of gas C in the gas storage container 27 ( Pressure), the exhaust gas Gp, and the mixing ratio of the air Aa are adjusted and controlled.

  As shown in FIG. 23, when the gas storage device 27 is provided with an adjustment valve 27a for adjusting the maximum pressure inside the gas storage container 27 and the gas compression device 25 is driven, work always occurs. The adjustment valve 27a is adjusted as follows. In FIG. 23, the adjustment valve 27 a is provided in the gas storage container 27, but the adjustment valve 27 a may be provided in the compressed gas supply passage 26 between the gas storage container 27 and the gas compression device 25.

  That is, the engine 1 has an EGR passage 17 for recirculating a part Ge of the exhaust gas G into the cylinder, a part Gp of the exhaust gas G of the engine 1, the air Aa, and any one of these mixed gases. A gas compression device 25 that compresses C, a gas storage container 27 that stores the gas C compressed by the gas compression device 25, and a gas storage supply passage 28 that connects the gas storage container 27 and the intake passage 12 are provided. Composed.

  Then, the intake passage 12 and the stored gas supply passage 28 are connected via the flow path switching valve 50A of the first embodiment. In this flow path switching valve 50A, the upstream side passage of the intake passage 12 is the first inlet side flow passage 51a, the stored gas supply passage 28 is the second inlet side flow passage 51b, and the downstream side of the intake passage 12 is the downstream side. The first outlet side flow path 52a is connected to each other, and is configured to switch between the stored gas supply path 28 side and the upstream side of the intake path 12 while the downstream side of the intake path 12 is open. .

  The gas storage container 61 shown in FIG. 12 of the flow path switching valve 50A is also used as the gas storage container 27 shown in FIG. 23, and the first gas chamber 57a and the second gas chamber 57b are used as the first driving gas supply path 62 and the like. And the second driving gas supply path 64 and the like. Thereby, the gas C from the gas storage container 27 is used as the driving gas Ap. The details are as shown in FIG. 12, but in FIG. 23, the configuration is simplified to avoid the complexity of the drawing.

  Further, as shown in FIG. 25, the engine 1B of the second embodiment is an engine including the flow path switching valve 50A of the first embodiment, and the EGR passage 17 is more than the turbine 14b of the exhaust passage 13. The other configuration is the same except that the downstream branching of the NOx purification catalyst 16 is different from the engine 1A of the first embodiment.

  As shown in FIG. 26, the engine 1C of the third embodiment is an engine including the flow path switching valve 50B of the second embodiment, and the flow path switching valve of the first embodiment. The point that the flow path switching valve 50B of the second embodiment is provided instead of 50A, and in the engine 1A of the first embodiment, the EGR passage 17 is an intake passage on the upstream side of the flow path switching valve 50A. 12 is different from the engine 1A of the first embodiment in that the EGR passage 17 is connected to the third inlet side flow passage 51c of the flow passage switching valve 50B. The configuration of is the same.

  As shown in FIG. 27, the engine 1D of the fourth embodiment is an engine including the flow path switching valve 50B of the second embodiment, and the EGR passage 17 is more than the turbine 14b of the exhaust passage 13. The only difference from the engine 1C of the third embodiment is that the branching from the downstream side of the downstream side NOx purification catalyst 16 is the same as that of the engine 1C of the third embodiment.

  As shown in FIG. 28, the engine 1E of the fifth embodiment is an engine including the flow path switching valve 50C of the third embodiment, and the flow path switching valve of the second embodiment. The flow path switching valve 50C of the third embodiment is provided instead of 50B, and the EGR passage 17 does not end with the flow path switching valve 50C, but is connected to the intake passage 12 downstream of the compressor 14a. The other configuration is the same except that it is different from the engine 1C of the third embodiment.

  Next, an EGR method for an internal combustion engine according to the present invention will be described. This EGR method is a method that can be implemented by the engine (internal combustion engine) 1A, 1B, 1C, 1D, 1E (hereinafter referred to as 1i) having the above-described configuration. In this EGR method, a part of the exhaust gas G in the exhaust passage (exhaust system passage) 13 of the engine 1i, the air Aa, and any one of these mixed gases C are compressed and stored.

  At the same time, in the EGR, when the engine 1i is not in a transient operation, part of the exhaust gas G of the engine 1i is recirculated into the cylinder via the EGR passage 17, and when in the transient operation, the gas C is temporarily supplied. Thus, the gas is supplied from the stored gas supply passage 28 to the intake passage (intake system passage) 12.

  When the engine 1i is not in transient operation using the flow path switching valves 50A, 50B, 50C (hereinafter referred to as 50i) of the first to third embodiments, the first of the flow path switching valve 50i. When the flow path is switched, the gas C is shut off by the flow path switching valve 50i, fresh air A and EGR gas Ge are supplied to the intake system passages 12 and 11a, and when the engine 1i is in a transient operation, the flow path switching valve 50i. In this second flow path switching, the fresh air A and the EGR gas Ge are shut off by the flow path switching valve 50i, and only the gas C is temporarily supplied to the intake system passages 12 and 11a.

  In these controls, the control device 40 controls the pressure adjusting valve 29 based on the detected value of the engine rotational speed Ne, the engine air amount Mo, the engine fuel amount (fuel injection amount) Q, the pressure inside the gas storage container 27, and the like. And the EGR valve 21 and the flow path switching valve 50i are controlled.

  According to the above-described engine (internal combustion engine) 1i and the above-described EGR method for an internal combustion engine, EGR deficiency caused by turbo lag during transient operation such as rapid acceleration can be resolved, and NOx emissions during transient operation can be reduced. At the same time, acceleration performance can be improved and PM can be reduced. Furthermore, by providing the above-described flow path switching valve 50i, it is possible to avoid damage to the flow path switching valve 50i and failure of the intake valve and the compressor 14a due to the damage.

  Since the flow path switching valve of the present invention can selectively switch the inlet side flow path at high speed and communicate with the outlet side flow path using a relatively high pressure driving gas, , A truck or the like that stores a part of the exhaust gas, air, and one of these mixed gases in a gas storage container, and temporarily supplies the gas into the cylinder during transient operation when the load suddenly increases. It can be used in internal combustion engines mounted on buses and passenger cars.

  Further, according to the internal combustion engine provided with the flow path switching valve of the present invention and the EGR method of the internal combustion engine, in transient operation such as during rapid acceleration, it is possible to prevent a decrease in acceleration performance due to the turbo lag. (Particulate matter) and NOx (nitrogen oxide) emissions can be reduced, damage to the flow path switching valve, and failure of the intake valve and compressor due to this damage can be avoided. It can be used as an EGR method for an internal combustion engine and an internal combustion engine mounted on a passenger car or the like.

1A, 1B, 1C, 1D, 1E, 1X, 1Y, 1Z engine (internal combustion engine)
11 Engine body 11a Intake manifold (intake system passage)
11b Exhaust manifold (exhaust system passage)
12 Intake passage (intake system passage)
13 Exhaust passage (exhaust system passage)
14 Turbo-type supercharger 14a Compressor 14b Turbine 17 EGR passage 21 EGR valve 22 Exhaust gas introduction passage 24 Three-way valve 25 Gas compression device 26 Compressed gas supply passage 27, 61 Storage gas container 28 Storage gas supply passage 40 Control devices 50A, 50B , 50C channel switching valve 51a first inlet side channel 51b second inlet side channel 51c third inlet side channel 52a first outlet side channel 52b second outlet side channel 53, 53A guide member 54 case 54g Wall surface 54f, 56d O-ring (seal member)
55 Shutter member 56 Piston 57 Cylinder 57a First gas chamber 57b Second gas chamber 57c First communication passage 57d Second communication passage 57e Buffer member 58 Spring (elastic body)
60 Drive System A Fresh Air Aa Air Ae Exhaust Gas Ap Drive Gas C Gas G Exhaust Gas Ge EGR Gas Gp Exhaust Gas Part P Clearance

Claims (7)

In the flow path switching valve that selectively connects one or more of the plurality of inlet-side flow paths to one or more outlet-side flow paths, or shuts off,
The inlet side flow path is provided on one side in the case, and the outlet side flow path is provided on the other side in the case so as to face a part or all of the inlet side flow path. A shutter member that slides between the outlet side channel and selectively connects and blocks the inlet side channel and the outlet side channel is provided. The shutter member is configured to slide, and a seal member is disposed between the shutter member and the case for sealing the outlet-side flow path,
Further, a guide member is provided for floating and sliding the shutter member from the inner wall surface on the outlet side flow path side of the case, and a gap is formed between the shutter member and the inner wall surface. Flow path switching valve.   The inlet-side channel is formed by a first inlet-side channel and a second inlet-side channel, and the outlet-side channel is formed by a first outlet-side channel. Communicating between the inlet-side channel and the first outlet-side channel and blocking between the second inlet-side channel and the first outlet-side channel. The first inlet-side flow path and the first outlet-side flow path are blocked, and the second inlet-side flow path and the first outlet-side flow path are communicated with each other. Flow path switching valve.   The inlet side channel is formed by a first inlet side channel, a second inlet side channel, and a third inlet side channel, and the outlet side channel is formed by a first outlet side channel. In the path switching, the second inlet side flow is communicated between the first inlet side flow path and the first outlet side flow path, and between the third inlet side flow path and the first outlet side flow path. Between the first inlet side flow path and the first outlet side flow path, and by switching the second flow path, The flow path switching valve according to claim 1, wherein the first outlet side flow path is blocked and the second inlet side flow path and the first outlet side flow path are communicated.   The inlet side channel is formed by a first inlet side channel, a second inlet side channel, and a third inlet side channel, and the outlet side channel is a first outlet side channel and a second outlet side channel. In the first flow path switching, the first inlet side flow path and the first outlet side flow path are communicated with each other, and the third inlet side flow path and the second outlet side flow path are communicated with each other. And between the second inlet side channel and the first outlet side channel, and by switching the second channel, between the first inlet side channel and the first outlet side channel, and 2. The third inlet side flow path and the second outlet side flow path are blocked, and the second inlet side flow path and the first outlet side flow path are communicated with each other. Flow path switching valve. An EGR passage for recirculating a portion of the exhaust gas of the internal combustion engine into the cylinder;
A gas compression device for compressing a part of the exhaust gas of the internal combustion engine, air, and any of these mixed gases;
A gas storage container for storing the gas compressed by the gas compression device;
The internal combustion engine provided with the storage gas supply passage which connects this gas storage container and an intake system passage, The intake air to the 1st entrance side channel of the channel change valve according to any one of claims 2-4. The upstream side of the system passage is connected, the storage gas supply passage is connected to the second inlet-side passage, the downstream side of the intake system passage is connected to the first outlet-side passage, and the passage switching Connecting the intake system passage and the stored gas supply passage through a valve;
When the internal combustion engine is not in a transient operation, fresh air in the intake system passage and EGR gas in the EGR gas passage are supplied to the intake system passage. When the internal combustion engine is in a transient operation, the storage gas supply passage An internal combustion engine characterized by temporarily supplying gas to the intake system passage.   6. The internal combustion engine according to claim 5, wherein the gas in the gas storage container is used as a driving gas for the piston of the flow path switching valve. A part of the exhaust gas in the exhaust system passage of the internal combustion engine, air, and any one of these mixed gases are compressed and stored. In EGR, when the internal combustion engine is not in a transient operation, one of the exhaust gases of the internal combustion engine is stored. In the EGR method for an internal combustion engine in which the gas is temporarily recirculated from the stored gas supply passage to the intake system passage when the internal combustion engine is in a transient operation by recirculating the part into the cylinder via the EGR passage,
Using the flow path switching valve according to any one of claims 2 to 4,
When the internal combustion engine is not in transient operation, the first flow path switching of the flow path switching valve shuts off the gas with the flow path switching valve, and supplies fresh air and EGR gas to the intake system passage. Is a transient operation, the second flow path switching of the flow path switching valve shuts off fresh air and EGR gas by the flow path switching valve, and temporarily supplies only the gas to the intake system passage. An EGR method for an internal combustion engine.

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