WO2013179465A1 - 可変圧縮比機構を備える内燃機関 - Google Patents
可変圧縮比機構を備える内燃機関 Download PDFInfo
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- WO2013179465A1 WO2013179465A1 PCT/JP2012/064201 JP2012064201W WO2013179465A1 WO 2013179465 A1 WO2013179465 A1 WO 2013179465A1 JP 2012064201 W JP2012064201 W JP 2012064201W WO 2013179465 A1 WO2013179465 A1 WO 2013179465A1
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- compression ratio
- mechanical compression
- internal combustion
- combustion engine
- engine
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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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D23/00—Controlling engines characterised by their being supercharged
- F02D23/005—Controlling engines characterised by their being supercharged with the supercharger being mechanically driven by the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an internal combustion engine provided with a variable compression ratio mechanism.
- An internal combustion engine having a variable compression ratio mechanism that makes a mechanical compression ratio variable by moving a cylinder block relative to a crankcase along a cylinder axis is known.
- each target mechanical compression ratio is set for the current engine operating state, and the variable compression ratio mechanism is realized so that the current target mechanical compression ratio is realized. Is controlled.
- the current target mechanical compression ratio may not be realized, and if the target mechanical compression ratio is not realized, the current desired expansion ratio is not realized.
- the current actual compression ratio can be estimated based on the intake valve closing timing. However, if the fuel cut is not performed in the operation of the current mechanical compression ratio, the current actual compression ratio cannot be estimated, and thus the current actual mechanical compression ratio cannot be estimated.
- an object of the present invention is to provide an internal combustion engine including a variable compression ratio mechanism that can estimate the current actual mechanical compression ratio when the fuel cut is not performed.
- An internal combustion engine comprising the variable compression ratio mechanism according to claim 1 of the present invention measures an exhaust temperature or an exhaust pressure that changes according to an actual expansion ratio, or according to at least one of the exhaust temperature and the exhaust pressure. It is characterized by measuring a changing physical quantity and estimating a current mechanical compression ratio based on the measured value.
- An internal combustion engine comprising the variable compression ratio mechanism according to claim 2 according to the present invention is the internal combustion engine comprising the variable compression ratio mechanism according to claim 1, wherein the measured value is a boost pressure on the downstream side of the compressor of the turbocharger. It is characterized by being.
- An internal combustion engine having a variable compression ratio mechanism is the internal combustion engine having the variable compression ratio mechanism according to the first or second aspect, wherein the operation amount of the actuator of the variable compression ratio mechanism is directly set.
- the actuator is controlled so that the operation amount detected by the detection device becomes an operation amount corresponding to a target mechanical compression ratio, and is detected by the detection device.
- the operating amount is corrected by a deviation between the operating amount corresponding to the mechanical compression ratio estimated based on the measured value in the specific engine operating state and the operating amount corresponding to the target mechanical compression ratio in the specific engine operating state.
- An internal combustion engine having the variable compression ratio mechanism according to claim 4 according to the present invention is the internal combustion engine having the variable compression ratio mechanism according to claim 3, wherein the target mechanical compression ratio is set to a mechanical compression setting in the specific engine operating state. The engine operating state is less than the ratio.
- An internal combustion engine provided with the variable compression ratio mechanism according to claim 5 according to the present invention is provided with a waste gate passage that bypasses the turbine of the turbocharger in the internal combustion engine provided with the variable compression ratio mechanism according to claim 1,
- the wastegate passage is provided with a wastegate valve that controls the amount of exhaust gas passing through the wastegate passage, and the turbocharging pressure downstream of the compressor of the turbocharger measured with the wastegate valve as a first opening. And a difference between the turbocharger compressor supercharging pressure measured with the wastegate valve as the second opening, is used as the measured value.
- An internal combustion engine having the variable compression ratio mechanism according to claim 6 according to the present invention is the internal combustion engine having the variable compression ratio mechanism according to claim 2 or 5, wherein a supercharger is disposed upstream of the compressor of the turbocharger. When the compressor is arranged, the supercharging pressure is a differential pressure across the compressor of the turbocharger.
- An internal combustion engine comprising the variable compression ratio mechanism according to claim 7 according to the present invention is an internal combustion engine comprising the variable compression ratio mechanism according to any one of claims 1 to 6, wherein the current actual compression ratio is estimated.
- the present invention is characterized in that the current valve closing timing of the intake valve is estimated based on the estimated current actual compression ratio and the estimated current mechanical compression ratio.
- the exhaust temperature or the exhaust pressure that changes according to the actual expansion ratio is measured, or at least one of the exhaust temperature and the exhaust pressure is measured.
- the physical quantity which changes according to this is measured, and the present mechanical compression ratio is estimated based on the measured value. Thereby, when the fuel cut is not performed, the current actual mechanical compression ratio can be estimated.
- the measured value is the supercharging on the downstream side of the compressor of the turbocharger. It is a pressure and the measured value for estimating a mechanical compression ratio can be measured using the boost pressure sensor generally provided.
- the operation amount of the actuator of the variable compression ratio mechanism is directly set.
- the actuator is controlled so that the operation amount detected by the detection device becomes an operation amount corresponding to the target mechanical compression ratio, and the operation amount detected by the detection device is provided. Is corrected by the deviation between the operating amount corresponding to the mechanical compression ratio estimated based on the measured value in the specific engine operating state and the operating amount corresponding to the target mechanical compression ratio in the specific engine operating state. Accordingly, the target mechanical compression ratio can be realized even in engine operation other than the specific engine operation state by controlling the actuator based on the corrected operation amount.
- the target machine compression ratio is set to a machine in which the specific engine operating state is set.
- the engine operating state is less than the compression ratio, and the exhaust temperature or exhaust pressure changes relatively greatly with respect to a slight deviation in the mechanical compression ratio when the target mechanical compression ratio is not realized.
- a shift in the compression ratio can be reliably detected, and the operation amount detected by the detection device can be accurately corrected.
- the internal combustion engine having the variable compression ratio mechanism according to claim 1 is provided with a waste gate passage that bypasses the turbine of the turbocharger.
- the wastegate passage is provided with a wastegate valve that controls the amount of exhaust gas passing through the wastegate passage, and the turbocharger's downstream boost pressure and wastegate are measured with the wastegate valve as the first opening.
- the difference between the turbocharger and the boost pressure on the downstream side of the compressor measured with the valve at the second opening is taken as the measured value. It is possible to eliminate the deviation amount of the supply pressure, and it is possible to estimate the mechanical compression ratio more accurately.
- the supercharger is disposed upstream of the compressor of the turbocharger.
- the supercharging pressure is the differential pressure across the turbocharger compressor.
- the current actual compression ratio is determined. Based on the estimated current actual compression ratio and the estimated current mechanical compression ratio, the current intake valve closing timing is estimated. Estimation is possible.
- 1 is an overall view of an internal combustion engine. It is a disassembled perspective view of a variable compression ratio mechanism.
- 1 is a schematic side sectional view of an internal combustion engine. It is a figure which shows a variable valve timing mechanism. It is a figure which shows the lift amount of an intake valve and an exhaust valve. It is a figure for demonstrating a mechanical compression ratio, an actual compression ratio, and an expansion ratio. It is a figure which shows the relationship between theoretical thermal efficiency and an expansion ratio. It is a figure for demonstrating a normal cycle and a super-high expansion ratio cycle. It is a figure which shows changes, such as a mechanical compression ratio according to an engine load. It is a 1st flowchart for estimating an actual mechanical compression ratio.
- 1 is a schematic overall view of an internal combustion engine when a turbocharger is arranged. It is a 3rd flowchart for estimating an actual mechanical compression ratio. It is a map for setting the correction amount of the mechanical compression ratio used in the third flowchart. It is a 4th flowchart for setting a supercharging pressure true value. It is a graph which shows the relationship between the opening degree of a waste gate valve, and a supercharging pressure.
- FIG. 1 shows a side sectional view of an internal combustion engine equipped with a variable compression ratio mechanism according to the present invention.
- 1 is a crankcase
- 2 is a cylinder block
- 3 is a cylinder head
- 4 is a piston
- 5 is a combustion chamber
- 6 is a spark plug disposed at the center of the top surface of the combustion chamber 5
- 7 is intake air.
- 8 is an intake port
- 9 is an exhaust valve
- 10 is an exhaust port.
- the intake port 8 is connected to a surge tank 12 via an intake branch pipe 11, and a fuel injection valve 13 for injecting fuel into the corresponding intake port 8 is arranged in each intake branch pipe 11.
- the fuel injection valve 13 may be arranged in each combustion chamber 5 instead of being attached to each intake branch pipe 11.
- the surge tank 12 is connected to an air cleaner 15 via an intake duct 14, and a throttle valve 17 driven by an actuator 16 and an intake air amount detector 18 using, for example, heat rays are arranged in the intake duct 14.
- the exhaust port 10 is connected via an exhaust manifold 19 to, for example, a catalyst device 20 containing a three-way catalyst, and an air-fuel ratio sensor 21 is disposed in the exhaust manifold 19.
- a temperature sensor 28 for measuring the exhaust temperature and a pressure sensor 29 for measuring the exhaust pressure are arranged.
- the piston 4 is positioned at the compression top dead center by changing the relative position of the crankcase 1 and the cylinder block 2 in the cylinder axial direction at the connecting portion between the crankcase 1 and the cylinder block 2.
- a variable compression ratio mechanism A capable of changing the volume of the combustion chamber 5 at the time
- an actual compression action start timing changing mechanism B capable of changing the actual start time of the compression action.
- the actual compression action start timing changing mechanism B is composed of a variable valve timing mechanism capable of controlling the closing timing of the intake valve 7.
- a relative position sensor 22 for detecting a relative positional relationship between the crankcase 1 and the cylinder block 2 is attached to the crankcase 1 and the cylinder block 2.
- An output signal indicating a change in the interval between the crankcase 1 and the cylinder block 2 is output.
- the variable valve timing mechanism B is provided with a valve timing sensor 23 for generating an output signal indicating the closing timing of the intake valve 7, and an output signal indicating the throttle valve opening is provided to the actuator 16 for driving the throttle valve.
- a throttle opening sensor 24 is attached.
- the electronic control unit 30 is composed of a digital computer, and is connected to each other by a bidirectional bus 31.
- the output signals of the intake air amount detector 18, the air-fuel ratio sensor 21, the relative position sensor 22, the valve timing sensor 23, the throttle opening sensor 24, the cam rotation angle sensor 25, the temperature sensor 28, and the pressure sensor 29 described later are respectively shown.
- the signal is input to the input port 35 via the corresponding AD converter 37.
- a load sensor 41 that generates an output voltage proportional to the depression amount L of the accelerator pedal 40 is connected to the accelerator pedal 40, and the output voltage of the load sensor 41 is input to the input port 35 via the corresponding AD converter 37. Is done. Further, a crank angle sensor 42 that generates an output pulse every time the crankshaft rotates, for example, 30 ° is connected to the input port 35.
- the output port 36 is connected to the spark plug 6, the fuel injection valve 13, the throttle valve driving actuator 16, the variable compression ratio mechanism A, and the variable valve timing mechanism B through corresponding drive circuits 38.
- FIG. 2 shows an exploded perspective view of the variable compression ratio mechanism A shown in FIG. 1, and FIG. 3 shows a side sectional view of the internal combustion engine schematically shown.
- a plurality of protrusions 50 spaced apart from each other, that is, cylinder block side supports, are formed below both side walls of the cylinder block 2, and each protrusion 50 has a circular cross section.
- the cam insertion hole 51 is formed.
- a cam insertion hole 53 having a circular cross section is also formed in each protrusion 52.
- a pair of camshafts 54, 55 are provided, and on each camshaft 54, 55, a concentric portion 58 is rotatably inserted into each cam insertion hole 53. positioned.
- Each concentric portion 58 is coaxial with the rotational axis of each camshaft 54, 55.
- eccentric portions 57 that are eccentrically arranged with respect to the rotation axes of the camshafts 54 and 55 are positioned on both sides of each concentric portion 58.
- a cam 56 is eccentrically mounted for rotation. That is, the eccentric portion 57 is fitted into an eccentric hole formed in the circular cam 56, and the circular cam 56 rotates around the eccentric portion 57 around the eccentric hole.
- the circular cams 56 are disposed on both sides of each concentric portion 58, and the circular cams 56 are rotatably inserted into the corresponding cam insertion holes 51.
- a cam rotation angle sensor 25 that generates an output signal representing the rotation angle of the camshaft 55 is attached to the camshaft 55.
- 3A, 3B, and 3C show the positional relationship between the center a of the concentric portion 58, the center b of the eccentric portion 57, and the center c of the circular cam 56 in each state. It is shown.
- the relative position of the crankcase 1 and the cylinder block 2 is determined by the distance between the center a of the concentric part 58 and the center c of the circular cam 56, and the concentric part.
- the variable compression ratio mechanism A changes the relative position between the crankcase 1 and the cylinder block 2 by a crank mechanism using a rotating cam.
- the volume of the combustion chamber 5 increases when the piston 4 is positioned at the compression top dead center. Therefore, by rotating the camshafts 54 and 55, the piston 4 is compressed at the top dead center.
- the volume of the combustion chamber 5 when it is located at can be changed.
- a pair of worms 61 and 62 having opposite spiral directions are attached to the rotation shaft of the drive motor 59, respectively.
- Worm wheels 63 and 64 that mesh with the worms 61 and 62 are fixed to the ends of the camshafts 54 and 55, respectively.
- the volume of the combustion chamber 5 when the piston 4 is located at the compression top dead center can be changed over a wide range.
- FIG. 4 shows the variable valve timing mechanism B attached to the end of the camshaft 70 for driving the intake valve 7 in FIG.
- the variable valve timing mechanism B includes a timing pulley 71 that is rotated in the direction of an arrow by a crankshaft of an engine via a timing belt, a cylindrical housing 72 that rotates together with the timing pulley 71, an intake valve A rotating shaft 73 that rotates together with the driving camshaft 70 and is rotatable relative to the cylindrical housing 72, and a plurality of partition walls 74 that extend from the inner peripheral surface of the cylindrical housing 72 to the outer peripheral surface of the rotating shaft 73. And a vane 75 extending from the outer peripheral surface of the rotating shaft 73 to the inner peripheral surface of the cylindrical housing 72 between the partition walls 74, and an advance hydraulic chamber 76 on each side of each vane 75.
- a retarding hydraulic chamber 77 is formed.
- the hydraulic oil supply control to the hydraulic chambers 76 and 77 is performed by the hydraulic oil supply control valve 78.
- the hydraulic oil supply control valve 78 includes hydraulic ports 79 and 80 connected to the hydraulic chambers 76 and 77, a hydraulic oil supply port 82 discharged from the hydraulic pump 81, a pair of drain ports 83 and 84, And a spool valve 85 for controlling communication between the ports 79, 80, 82, 83, and 84.
- variable valve timing mechanism B can advance and retard the cam phase of the intake valve driving camshaft 70 by a desired amount.
- the solid line shows the time when the cam phase of the intake valve driving camshaft 70 is advanced the most by the variable valve timing mechanism B
- the broken line shows the cam phase of the intake valve driving camshaft 70 being the most advanced. It shows when it is retarded. Therefore, the valve opening period of the intake valve 7 can be arbitrarily set between the range indicated by the solid line and the range indicated by the broken line in FIG. 5, and therefore the closing timing of the intake valve 7 is also the range indicated by the arrow C in FIG. Any crank angle can be set.
- variable valve timing mechanism B shown in FIG. 1 and FIG. 4 shows an example.
- variable valve timing that can change only the closing timing of the intake valve while keeping the opening timing of the intake valve constant.
- Various types of variable valve timing mechanisms, such as mechanisms, can be used.
- FIG. 6 (A), (B), and (C) show an engine having a combustion chamber volume of 50 ml and a piston stroke volume of 500 ml for the sake of explanation.
- the combustion chamber volume represents the volume of the combustion chamber when the piston is located at the compression top dead center.
- FIG. 6A explains the mechanical compression ratio.
- FIG. 6B illustrates the actual compression ratio.
- FIG. 6C explains the expansion ratio.
- FIG. 7 shows the relationship between the theoretical thermal efficiency and the expansion ratio
- FIG. 8 shows a comparison between a normal cycle and an ultrahigh expansion ratio cycle that are selectively used according to the load in the present invention.
- FIG. 8 (A) shows a normal cycle when the intake valve closes near the bottom dead center and the compression action by the piston is started from the vicinity of the intake bottom dead center.
- the combustion chamber volume is set to 50 ml
- the stroke volume of the piston is set to 500 ml, similarly to the example shown in FIGS. 6A, 6B, and 6C.
- the actual compression ratio is almost 11
- the solid line in FIG. 7 shows the change in the theoretical thermal efficiency when the actual compression ratio and the expansion ratio are substantially equal, that is, in a normal cycle.
- the theoretical thermal efficiency increases as the expansion ratio increases, that is, as the actual compression ratio increases. Therefore, in order to increase the theoretical thermal efficiency in a normal cycle, it is only necessary to increase the actual compression ratio.
- the actual compression ratio can only be increased to a maximum of about 12 due to the restriction of the occurrence of knocking at the time of engine high load operation, and thus the theoretical thermal efficiency cannot be sufficiently increased in a normal cycle.
- FIG. 8B shows an example where the variable compression ratio mechanism A and variable valve timing mechanism B are used to increase the expansion ratio while maintaining the actual compression ratio at a low value.
- variable compression ratio mechanism A reduces the combustion chamber volume from 50 ml to 20 ml.
- variable valve timing mechanism B delays the closing timing of the intake valve until the actual piston stroke volume is reduced from 500 ml to 200 ml.
- the actual compression ratio is almost 11 and the expansion ratio is 11, as described above.
- FIG. 8B Only the expansion ratio is shown in FIG. 8B. It can be seen that it has been increased to 26. This is why it is called an ultra-high expansion ratio cycle.
- FIG. 9 shows changes in the intake air amount, the intake valve closing timing, the mechanical compression ratio, the expansion ratio, the actual compression ratio, and the opening degree of the throttle valve 17 according to the engine load at a certain engine speed.
- . 9 shows that the average air-fuel ratio in the combustion chamber 5 is the output signal of the air-fuel ratio sensor 21 so that unburned HC, CO and NO x in the exhaust gas can be simultaneously reduced by the three-way catalyst in the catalyst device 20. This shows a case where feedback control is performed to the theoretical air-fuel ratio based on the above.
- the normal cycle shown in FIG. 8 (A) is executed during engine high load operation. Accordingly, as shown in FIG. 9, the expansion ratio is low because the mechanical compression ratio is lowered at this time, and the valve closing timing of the intake valve 7 is advanced as shown by the solid line in FIG. ing. At this time, the amount of intake air is large, and at this time, the opening degree of the throttle valve 17 is kept fully open, so that the pumping loss is zero.
- the mechanical compression ratio is increased as the intake air amount is decreased while the actual compression ratio is substantially constant. That is, the volume of the combustion chamber 5 when the piston 4 reaches the compression top dead center is decreased in proportion to the decrease in the intake air amount. Therefore, the volume of the combustion chamber 5 when the piston 4 reaches the compression top dead center changes in proportion to the intake air amount.
- the air-fuel ratio in the combustion chamber 5 is the stoichiometric air-fuel ratio, so the volume of the combustion chamber 5 when the piston 4 reaches the compression top dead center is proportional to the fuel amount. Will change.
- the mechanical compression ratio When the engine load is further reduced, the mechanical compression ratio is further increased, and when the engine load is lowered to the medium load L1 slightly close to the low load, the mechanical compression ratio becomes a limit mechanical compression ratio (upper limit mechanical compression) that becomes the structural limit of the combustion chamber 5. Ratio).
- the mechanical compression ratio reaches the limit mechanical compression ratio, the mechanical compression ratio is held at the limit mechanical compression ratio in a region where the load is lower than the engine load L1 when the mechanical compression ratio reaches the limit mechanical compression ratio. Accordingly, the mechanical compression ratio is maximized and the expansion ratio is maximized at the time of low engine load operation and low engine load operation, that is, at the engine low load operation side. In other words, the mechanical compression ratio is maximized so that the maximum expansion ratio is obtained on the engine low load operation side.
- the closing timing of the intake valve 7 becomes the limit closing timing that can control the amount of intake air supplied into the combustion chamber 5.
- the closing timing of the intake valve 7 reaches the limit closing timing, the closing timing of the intake valve 7 is reduced in a region where the load is lower than the engine load L1 when the closing timing of the intake valve 7 reaches the closing timing. It is held at the limit closing timing.
- the intake air amount can no longer be controlled by the change in the closing timing of the intake valve 7.
- the intake valve 7 is supplied into the combustion chamber 5 by the throttle valve 17.
- the amount of intake air to be controlled is controlled, and the opening degree of the throttle valve 17 is made smaller as the engine load becomes lower.
- the intake air amount can be controlled without depending on the throttle valve 17 by advancing the closing timing of the intake valve 7 as the engine load becomes lower as shown by the broken line in FIG. Accordingly, when expressing the case shown in FIG. 9 so as to include both the case indicated by the solid line and the case indicated by the broken line, in the embodiment according to the present invention, the valve closing timing of the intake valve 7 becomes smaller as the engine load becomes lower. It is moved in a direction away from the intake bottom dead center BDC until the limit valve closing timing L1 at which the intake air amount supplied into the combustion chamber can be controlled.
- the intake air amount can be controlled by changing the closing timing of the intake valve 7 as shown by the solid line in FIG. 9 or by changing it as shown by the broken line.
- the expansion ratio is 26 in the ultra-high expansion ratio cycle shown in FIG.
- the internal combustion engine of the present embodiment has a target mechanical compression ratio determined with respect to the current engine load, and the actuator of the variable compression ratio mechanism A, that is, the drive motor 59,
- the operation amount is controlled to be an operation amount corresponding to the current target machine compression ratio.
- the operation amount of the drive motor 59 (the number of rotations including the decimal point) may be directly detected by a specific sensor (not shown), but the crankcase 1 detected by the relative position sensor 22 described above. Alternatively, it may be detected indirectly based on the relative position between the cylinder block 2 and the rotation angle of the camshaft 55 detected by the cam rotation angle sensor 25 described above.
- the actuator of the variable compression ratio mechanism A is controlled in this way, the current target mechanical compression ratio may not actually be realized. If the target mechanical compression ratio is not realized, the current desired expansion ratio is not realized, and the thermal efficiency cannot be sufficiently increased.
- the internal combustion engine equipped with the variable compression ratio mechanism of the present embodiment is configured to estimate the current mechanical compression ratio in the specific engine operating state according to the first flowchart shown in FIG.
- step 101 the current steady state in which the engine load and the engine speed have not changed based on the current engine load detected by the load sensor 41 and the current engine speed detected by the crank angle sensor 42. It is determined whether the engine operating state is a specific engine operating state. When this determination is negative, the process is terminated as it is, but when the engine is in a specific engine operating state, the determination at step 101 is affirmed, and at step 102, the current exhaust gas that changes according to the actual expansion ratio by the temperature sensor 28. A temperature T is detected.
- step 103 a temperature deviation ⁇ T between the current exhaust gas temperature T and the ideal exhaust gas temperature T ′ when the target mechanical compression ratio is realized in the specific engine operating state is calculated.
- step 104 a mechanical compression ratio correction amount ⁇ E for the temperature deviation ⁇ T is set based on the map shown in FIG. In the map of FIG. 11, if the temperature deviation ⁇ T is 0, that is, if the current exhaust gas temperature T is the ideal exhaust gas temperature T ′, the target mechanical compression ratio is realized and the desired expansion ratio is also realized. Therefore, the mechanical compression ratio correction amount ⁇ E becomes zero.
- the temperature deviation ⁇ T is greater than 0, since the current exhaust gas temperature T is higher than the ideal exhaust gas temperature T ′, the current mechanical compression ratio is lower than the target mechanical compression ratio, and the expansion ratio is also lower than the desired value.
- the temperature deviation ⁇ T is smaller than 0, the current exhaust gas temperature T is lower than the ideal exhaust gas temperature T ′, so the current mechanical compression ratio is higher than the target mechanical compression ratio.
- the expansion ratio is higher than the desired value, and the thermal efficiency is improved more than necessary. Further, at this time, the actual compression ratio becomes higher than the constant value shown in FIG. 9, and knocking is likely to occur.
- the mechanical compression ratio correction amount ⁇ E is set to be smaller as the temperature deviation ⁇ T is larger.
- the mechanical compression ratio correction amount ⁇ E is negative.
- the mechanical compression ratio correction amount ⁇ E is a positive value.
- step 105 the current actual mechanical compression ratio Er is calculated by adding the mechanical compression ratio correction amount ⁇ E set in step 104 to the current target mechanical compression ratio Et.
- the actual mechanical pressure ratio Er in the specific engine operating state can be estimated.
- step 106 the operation amount Ar of the actuator of the variable compression ratio mechanism A corresponding to the estimated current actual mechanical compression ratio Er is calculated.
- step 107 the target operation amount At and the deviation of the actuator corresponding to the operation amount Ar calculated at step 106 and the current (specific engine operating state) target mechanical compression ratio Et are calculated as the operation amount correction amount ⁇ A. .
- the operation amount correction amount ⁇ A thus calculated is a deviation amount between the actual operation amount of the actuator and the operation amount of the actuator calculated based on the output of the detection device such as the relative position sensor 22 or the cam rotation angle sensor 25.
- the current actual operation amount can be calculated by adding and correcting the operation amount calculated based on the output of the detection device.
- the actuator of the variable compression ratio mechanism A is controlled so that the corrected operation amount becomes an operation amount corresponding to the target mechanical compression ratio in each engine operation state, each target in each engine operation state is obtained.
- a mechanical compression ratio can be realized.
- the internal combustion engine equipped with the variable compression ratio mechanism of the present embodiment can also estimate the current mechanical compression ratio in the specific engine operating state by the second flowchart shown in FIG.
- step 201 based on the current engine load detected by the load sensor 41 and the current engine speed detected by the crank angle sensor 42, is the current steady engine operating state a specific engine operating state? It is determined whether or not. If this determination is negative, the process ends as it is, but if the engine is in a specific engine operating state, the determination in step 201 is affirmed, and in step 202, the current exhaust gas that is changed by the pressure sensor 29 according to the actual expansion ratio. Pressure PE is detected.
- step 203 a pressure deviation ⁇ PE between the current exhaust gas pressure PE and the ideal exhaust gas pressure PE 'when the target mechanical compression ratio is realized in the specific engine operation state is calculated.
- step 204 a mechanical compression ratio correction amount ⁇ E for the pressure deviation ⁇ PE is set based on the map shown in FIG. In the map of FIG. 13, if the pressure deviation ⁇ PE is 0, that is, if the current exhaust gas pressure PE is the ideal exhaust gas pressure PE ′, the target mechanical compression ratio is realized and the desired expansion ratio is also realized. Therefore, the mechanical compression ratio correction amount ⁇ E becomes zero.
- the current exhaust gas pressure PE is higher than the ideal exhaust gas pressure PE ′, so the current mechanical compression ratio is lower than the target mechanical compression ratio, and the expansion ratio is also lower than the desired value. Therefore, when the pressure deviation ⁇ PE is smaller than 0, the current exhaust gas pressure PE is lower than the ideal exhaust gas pressure PE ′, so the current mechanical compression ratio is higher than the target mechanical compression ratio. The expansion ratio is higher than the desired value, and the thermal efficiency is improved more than necessary. Further, at this time, the actual compression ratio becomes higher than the constant value shown in FIG. 9, and knocking is likely to occur.
- the mechanical compression ratio correction amount ⁇ E is negative.
- the mechanical compression ratio correction amount ⁇ E is a positive value.
- step 205 the current actual mechanical compression ratio Er is calculated by adding the mechanical compression ratio correction amount ⁇ E set in step 204 to the current target mechanical compression ratio Et.
- the actual mechanical pressure ratio Er in the specific engine operating state can be estimated.
- step 206 the operating amount Ar of the actuator of the variable compression ratio mechanism A corresponding to the estimated actual actual mechanical compression ratio Er is calculated.
- step 207 the target operation amount At and the deviation of the actuator corresponding to the operation amount Ar calculated at step 206 and the current (specific engine operating state) target mechanical compression ratio Et are calculated as the operation amount correction amount ⁇ A. .
- the operation amount correction amount ⁇ A thus calculated is a deviation amount between the actual operation amount of the actuator and the operation amount of the actuator calculated based on the output of the detection device such as the relative position sensor 22 or the cam rotation angle sensor 25.
- the current actual operation amount can be calculated by adding and correcting the operation amount calculated based on the output of the detection device.
- the actuator of the variable compression ratio mechanism A is controlled so that the corrected operation amount becomes an operation amount corresponding to the target mechanical compression ratio in each engine operation state, each target in each engine operation state is obtained.
- a mechanical compression ratio can be realized.
- FIG. 14 is a schematic overall view when a turbocharger is arranged in an internal combustion engine having a variable compression ratio mechanism.
- the members described in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted.
- a turbocharger compressor 90 is disposed in the intake duct 14 ′ between the surge tank 12 and the air cleaner 15, and a supercharger compressor 91 is disposed upstream of the turbocharger compressor 90. Has been placed.
- the turbocharger compressor 90 cannot sufficiently increase the supercharging pressure when the exhaust pressure is low as in the case of low engine rotation, and the supercharger compressor 90 assists the turbocharging of the turbocharger during low engine rotation. 91 is provided.
- the compressor 91 of the supercharger is an engine drive type, is connected to the engine drive shaft via an electromagnetic clutch (not shown), and can be stopped by being separated from the engine drive shaft by the electromagnetic clutch.
- the compressor 91 of the supercharger is driven efficiently by the engine drive shaft at the time of low engine speed, there is a possibility of damage due to excessive rotation at the time of high engine speed.
- the compressor 91 of the supercharger is separated from the engine drive shaft by an electromagnetic clutch.
- Reference numeral 92 is a supercharging pressure sensor for measuring the intake pressure downstream of the turbocharger compressor 90 in the intake duct 14 'as a supercharging pressure
- 93 is the turbocharger compressor 90 and supercharger in the intake duct 14'. This is an intake pressure sensor for measuring the intake pressure with the compressor 91.
- An intercooler 94 cools the intake air supercharged by the compressor 90 of the turbocharger.
- a turbocharger turbine 96 is disposed on the upstream side of the catalyst device 20.
- Reference numeral 97 denotes a waste gate passage that bypasses the turbine 96, and a waste gate valve 98 that controls the amount of exhaust gas that passes through the waste gate passage 97 is disposed in the waste gate passage 97.
- the internal combustion engine provided with the variable compression ratio mechanism of the present embodiment is configured to estimate the current mechanical compression ratio in the specific engine operating state according to the third flowchart shown in FIG.
- step 301 based on the current engine load detected by the load sensor 41 and the current engine speed detected by the crank angle sensor 42, is the current steady engine operating state a specific engine operating state? It is determined whether or not. When this determination is denied, the process is terminated as it is, but when the engine is in a specific engine operating state, the determination at step 301 is affirmed, and at step 302, the current value that changes according to the exhaust gas temperature and the exhaust pressure by the supercharging pressure sensor 92 is determined. The turbocharger PI is detected.
- the current supercharging pressure PI detected by the supercharging pressure sensor 92 is the actual supercharging pressure PI.
- the turbocharger is used as the supercharging pressure PI. A differential pressure between the pressure detected by the supercharging pressure sensor 92 and the pressure detected by the intake pressure sensor 93 is detected.
- a supercharging pressure deviation ⁇ PI between the current supercharging pressure PI and the ideal supercharging pressure PI ′ when the target mechanical compression ratio is realized in the specific engine operating state is calculated.
- the mechanical compression ratio correction amount ⁇ E for the supercharging pressure deviation ⁇ PI is set based on the map shown in FIG. In the map of FIG. 16, if the supercharging pressure deviation ⁇ PI is 0, that is, if the current supercharging pressure PI is the ideal supercharging pressure PI ′, the target mechanical compression ratio is realized and the desired expansion ratio is also realized. Thus, the mechanical compression ratio correction amount ⁇ E becomes zero.
- the current supercharging pressure PI is higher than the ideal supercharging pressure PI ′, so the current mechanical compression ratio is lower than the target mechanical compression ratio, and the expansion ratio is also less than the desired value.
- the current supercharging pressure deviation ⁇ PI is smaller than 0, the current supercharging pressure PI is lower than the ideal supercharging pressure PI ′, so that the current mechanical compression ratio is the target. It is higher than the mechanical compression ratio and the expansion ratio is higher than the desired value, and the thermal efficiency is improved more than necessary. Further, at this time, the actual compression ratio becomes higher than the constant value shown in FIG. 9, and knocking is likely to occur.
- the mechanical compression ratio correction amount ⁇ E is set to be smaller as the boost pressure deviation ⁇ PI is larger as a whole.
- the mechanical compression ratio correction is performed.
- the amount ⁇ E is a negative value, and when the supercharging pressure deviation ⁇ PI is smaller than 0, the mechanical compression ratio correction amount ⁇ E is a positive value.
- the current actual mechanical compression ratio Er is calculated by adding the mechanical compression ratio correction amount ⁇ E set at step 304 to the current target mechanical compression ratio Et.
- the actual mechanical pressure ratio Er in the specific engine operating state can be estimated.
- the ideal supercharging pressure PI ′ when the target mechanical compression ratio is realized in each engine operating state is preset in a map or the like, the supercharging pressure deviation from the current supercharging pressure PI ⁇ PI can be calculated.
- the map of the mechanical compression ratio correction amount ⁇ E with respect to the supercharging pressure deviation ⁇ PI as shown in FIG. 16 is set in each engine operating state, the current actual mechanical compression ratio is determined in each engine operating state. It is also possible to estimate.
- step 306 the operation amount Ar of the actuator of the variable compression ratio mechanism A corresponding to the estimated actual actual mechanical compression ratio Er is calculated.
- step 307 the target operation amount At and the deviation of the actuator corresponding to the operation amount Ar calculated at step 306 and the current (specific engine operation state) target mechanical compression ratio Et are calculated as the operation amount correction amount ⁇ A. .
- the operation amount correction amount ⁇ A thus calculated is a deviation amount between the actual operation amount of the actuator and the operation amount of the actuator calculated based on the output of the detection device such as the relative position sensor 22 or the cam rotation angle sensor 25.
- the current actual operation amount can be calculated by adding and correcting the operation amount calculated based on the output of the detection device.
- the actuator of the variable compression ratio mechanism A is controlled so that the corrected operation amount becomes an operation amount corresponding to the target mechanical compression ratio in each engine operation state, each target in each engine operation state is obtained.
- a mechanical compression ratio can be realized.
- the turbocharger supercharging pressure is measured as a physical quantity that changes in accordance with at least one of the exhaust temperature and the exhaust pressure that changes in accordance with the actual expansion ratio, and the current value based on the measured supercharging pressure is measured.
- the mechanical compression ratio is estimated.
- the supercharging pressure on the downstream side of the turbocharger compressor 90 can be measured using a generally provided supercharging pressure sensor 92, and there is no need to newly provide a sensor for measuring a physical quantity.
- the turbocharger Turbine speed etc. can also be measured.
- the specific engine operating state is preferably an engine operating state in which the target mechanical compression ratio is equal to or less than the set mechanical compression ratio. If the target mechanical compression ratio is reduced in this way, the exhaust temperature or the exhaust pressure changes relatively greatly with respect to a slight shift in the mechanical compression ratio when the target mechanical compression ratio is not realized. A slight shift in the mechanical compression ratio can be reliably detected, and the operation amount A of the actuator of the variable compression ratio mechanism A detected by the detection device can be accurately corrected.
- the turbocharger supercharging pressure PI (when the supercharger is provided, the differential pressure across the turbocharger compressor 90) measured in the specific engine operating state, and the specific engine operating state
- the actual mechanical compression ratio in the specific engine operating state is estimated based on the supercharging pressure deviation ⁇ PI with respect to the ideal supercharging pressure PI ′ of the turbocharger when the desired expansion ratio is realized.
- the mechanical pressure ratio is accurately estimated by calculating the supercharging pressure deviation ⁇ PI using the supercharging pressure true value PIr in which the deviation amount is eliminated instead of the measured value PI in step 303 of the third flowchart. can do.
- step 401 as in step 301 of the third flowchart, it is determined whether or not the engine is in a specific engine operating state. If this determination is negative, the process is terminated as it is, but if the determination in step 401 is affirmative, in step 402, the opening of the waste gate valve 98 is set to the first opening that is a desired opening when the specific engine is operating.
- the first supercharging pressure PI1 of the turbocharger when the degree is TA1 (for example, the fully closed opening) is measured.
- Step 403 the opening degree of the waste gate valve 98 is set to a second opening degree TA2 (for example, a half-opening degree degree) larger than the first opening degree TA1, and in Step 404, the opening degree of the waste gate valve 98 is set in a specific engine operating state.
- the second supercharging pressure PI2 of the turbocharger is measured with the second opening TA2.
- step 405 a difference dPI between the first boost pressure PI1 and the second boost pressure PI2 is calculated.
- the second opening TA2 of the wastegate valve 98 Since the same deviation amount is included in the measured value PI2 of the supercharging pressure, the deviation amount due to machine difference is offset.
- the supercharging pressure true value PIr is set based on the difference dPI.
- FIG. 18 shows a change in the design supercharging pressure with respect to the opening degree of the waste gate valve 98 in the specific engine operating state, and a plurality of solid lines indicate differences in the expansion ratio.
- the waste gate valve 98 in the specific engine operation state, is set to the second opening degree TA2 as the supercharging pressure PI when the waste gate valve 98 is the first opening degree TA1 is higher.
- the amount of decrease in supercharging pressure, that is, the aforementioned difference dPI increases.
- the supercharging pressure true value PIr when the waste gate valve 98 is at the first opening TA1 can be uniquely set for the difference dPI in advance. That is, as illustrated in FIG. 18, the supercharging pressure true value PIr when the difference dPI is dPI 1 (according to the machine difference when the waste gate valve 98 is at the first opening TA1 in the specific engine operation state). supercharging pressure) PIR 1 becomes free of shift amount, the supercharging ⁇ value PIR is PIR 2 next time difference dpi is dpi 2, the supercharging ⁇ value PIR when the difference dpi is dpi 3 the PIr 3. Thus, the corresponding boost pressure true value can be set in advance for other values of the difference dPI. Thus, in step 406, the supercharging pressure true value PIr can be set based on the difference dPI.
- the second opening degree TA2 of the waste gate valve 98 is larger than the first opening degree TA1, but the desired first opening degree TA1 of the waste gate valve 98 in the specific engine operating state is not the fully closed opening degree.
- the second opening degree TA2 may be smaller than the first opening degree TA1.
- an accurate mechanical compression ratio Er at the time of the specific engine operation state is estimated, by estimating the actual compression ratio at the time of the specific engine operation state, Based on the estimated mechanical compression ratio and actual compression ratio, it is possible to estimate the exact closing timing of the intake valve in the specific engine operating state, and the closing timing of the intake valve detected by the valve timing sensor 23 It is also possible to calculate the correction amount.
- the actual compression ratio in the specific engine operating state can be estimated by any method. For example, the actual compression ratio is estimated based on the fact that the higher the combustion pressure or the more likely knocking occurs, the higher the actual compression ratio becomes. can do.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supercharger (AREA)
Abstract
Description
29 圧力センサ
90 ターボチャージャのコンプレッサ
92 過給圧センサ
96 ターボチャージャのタービン
97 ウェイストゲート通路
98 ウェイストゲートバルブ
A 可変圧縮比機構
B 可変バルブタイミング機構
Claims (7)
- 実際の膨張比に応じて変化する排気温度又は排気圧力を測定し、又は、排気温度及び排気圧力の少なくとも一方に応じて変化する物理量を測定し、測定された測定値に基づき現在の機械圧縮比を推定することを特徴とする可変圧縮比機構を備える内燃機関。
- 前記測定値はターボチャージャのコンプレッサの下流側の過給圧であることを特徴とする請求項1に記載の可変圧縮比機構を備える内燃機関。
- 前記可変圧縮比機構のアクチュエータの作動量を直接的に又は間接的に検出する検出装置を具備し、前記アクチュエータは、前記検出装置により検出される作動量が目標機械圧縮比に対応する作動量となるように制御され、前記検出装置により検出される作動量は、特定機関運転状態において前記測定値に基づき推定された機械圧縮比に対応する作動量と前記特定機関運転状態の目標機械圧縮比に対応する作動量との偏差により補正されることを特徴とする請求項1又2に記載の可変圧縮比機構を備える内燃機関。
- 前記特定機関運転状態は、目標機械圧縮比が設定機械圧縮比以下となる機関運転状態であることを特徴とする請求項3に記載の可変圧縮比機構を備える内燃機関。
- 前記ターボチャージャのタービンをバイパスするウェイストゲート通路が設けられ、前記ウェイストゲート通路には前記ウェイストゲート通路を通過する排気量を制御するウェイストゲートバルブが配置され、前記ウェイストゲートバルブを第一開度として測定された前記ターボチャージャのコンプレッサの下流側の過給圧と前記ウェイストゲートバルブを第二開度として測定された前記ターボチャージャのコンプレッサの過給圧との差を前記測定値とすることを特徴とする請求項1に記載の可変圧縮比機構を備える内燃機関。
- 前記ターボチャージャの前記コンプレッサの上流側にスーパーチャージャのコンプレッサが配置されるときには、前記過給圧は前記ターボチャージャの前記コンプレッサの前後差圧とすることを特徴とする請求項2又は5に記載の可変圧縮比機構を備える内燃機関。
- 現在の実圧縮比を推定し、推定された現在の実圧縮比と推定された現在の機械圧縮比とに基づき、現在の吸気弁の閉弁時期を推定することを特徴とする請求項1から6のいずれか一項に記載の可変圧縮比機構を備える内燃機関。
Priority Applications (5)
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EP12877817.2A EP2857659B1 (en) | 2012-05-31 | 2012-05-31 | Internal combustion engine comprising variable compression ratio mechanism |
PCT/JP2012/064201 WO2013179465A1 (ja) | 2012-05-31 | 2012-05-31 | 可変圧縮比機構を備える内燃機関 |
CN201280073535.0A CN104350258B (zh) | 2012-05-31 | 2012-05-31 | 具备可变压缩比机构的内燃机 |
US14/403,676 US9528437B2 (en) | 2012-05-31 | 2012-05-31 | Internal combustion engine comprising variable compression ratio mechanism |
JP2014518189A JP5949916B2 (ja) | 2012-05-31 | 2012-05-31 | 可変圧縮比機構を備える内燃機関 |
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PCT/JP2012/064201 WO2013179465A1 (ja) | 2012-05-31 | 2012-05-31 | 可変圧縮比機構を備える内燃機関 |
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US9695762B2 (en) | 2012-10-09 | 2017-07-04 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine provided with variable compression ratio mechanism |
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JP6443408B2 (ja) * | 2016-07-21 | 2018-12-26 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP6791746B2 (ja) * | 2016-12-22 | 2020-11-25 | トヨタ自動車株式会社 | 内燃機関の制御装置及び制御方法 |
JP6597699B2 (ja) | 2017-04-11 | 2019-10-30 | トヨタ自動車株式会社 | 内燃機関 |
DE102017209112B4 (de) * | 2017-05-31 | 2019-08-22 | Continental Automotive Gmbh | Verfahren zur Ermittlung des aktuellen Verdichtungsverhältnisses eines Verbrennungsmotors im Betrieb |
CN107288702B (zh) * | 2017-07-15 | 2019-07-12 | 高焱 | 一种新型内燃机可变压缩比装置 |
US10450983B2 (en) | 2017-12-11 | 2019-10-22 | Ford Global Technologies, Llc | Method and system for diagnosing operation of an engine compression ratio changing mechanism |
US10935462B2 (en) | 2018-04-26 | 2021-03-02 | Ford Global Technologies, Llc | Method for variable compression ratio engine |
JP7348715B2 (ja) * | 2018-04-26 | 2023-09-21 | 株式会社三井E&S Du | エンジンシステム |
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Publication number | Publication date |
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CN104350258B (zh) | 2017-10-31 |
US9528437B2 (en) | 2016-12-27 |
EP2857659A1 (en) | 2015-04-08 |
JP5949916B2 (ja) | 2016-07-13 |
EP2857659A4 (en) | 2016-03-02 |
JPWO2013179465A1 (ja) | 2016-01-14 |
CN104350258A (zh) | 2015-02-11 |
EP2857659B1 (en) | 2017-05-10 |
US20150136089A1 (en) | 2015-05-21 |
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