WO2012107950A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
- Publication number
- WO2012107950A1 WO2012107950A1 PCT/JP2011/000686 JP2011000686W WO2012107950A1 WO 2012107950 A1 WO2012107950 A1 WO 2012107950A1 JP 2011000686 W JP2011000686 W JP 2011000686W WO 2012107950 A1 WO2012107950 A1 WO 2012107950A1
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- WIPO (PCT)
- Prior art keywords
- valve
- egr
- internal combustion
- combustion engine
- foreign matter
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
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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
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
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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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device for an internal combustion engine equipped with an exhaust gas circulation device.
- This exhaust gas circulation device disclosed in Patent Document 1 recirculates a part of the exhaust gas flowing through the exhaust passage to the intake passage, and the flow rate of EGR gas provided in the EGR passage and recirculated to the intake passage.
- An EGR valve to be adjusted and an EGR cooler that is provided on the exhaust passage side from the EGR valve and cools the recirculated EGR gas by heat exchange with the engine cooling water are provided.
- Such an exhaust circulation device realizes the recirculation of the EGR gas from the exhaust passage to the intake passage according to the operating state of the internal combustion engine by adjusting the flow rate of the EGR gas flowing through the EGR passage by the EGR valve. It has become.
- the EGR gas contains PM (particulate matter), unburned gas, lubricating oil, and the like, and these adhere and deposit as deposits on the valve body and valve seat of the EGR valve.
- PM partate matter
- unburned gas unburned gas
- lubricating oil lubricating oil
- the EGR valve is constituted by a metering valve that can be opened and closed in the EGR passage, such as a poppet metering valve or a butterfly metering valve.
- the exhaust gas circulation device disclosed in Patent Document 2 is provided with an exhaust gas recirculation passage provided so as to communicate an exhaust passage and an intake air passage of an internal combustion engine, and a valve body with respect to a valve seat.
- An exhaust gas recirculation control valve whose opening degree is controlled by a reciprocating motion of the valve body by a motor, and a foreign matter removal control means for executing a foreign matter removal operation for opening the valve body to the fully open position at least once when a predetermined condition is satisfied.
- the predetermined condition described above includes the fact that the cranking is not started when the internal combustion engine is started.
- the foreign matter removing operation is executed at the start, not just after the internal combustion engine is stopped, when the predetermined condition is satisfied. Therefore, the oil component with viscosity that causes foreign matter to adhere to some extent evaporates and the valve body is opened to the fully open position when the foreign matter is dry, so it is easy to remove foreign matter caught between the valve seat and the valve seat. Can drop off.
- the opening and closing of the valve body is executed before the internal combustion engine is actually started, the influence on the operability of the engine can be reduced.
- the control apparatus for an internal combustion engine disclosed in Patent Document 3 is applied to an internal combustion engine having a butterfly valve body provided in a gas passage of the internal combustion engine and an actuator for rotating the butterfly valve body, and operates the actuator. By doing so, the opening and closing control of the butterfly valve body is performed. Then, the control device for an internal combustion engine disclosed in Patent Document 3 calculates a deposit generation amount according to the operating state of the internal combustion engine, and accumulates it to estimate a deposit accumulation amount accumulated in the gas passage. An amount estimating means; and a deposit removing means for rotating the butterfly valve body based on the deposit accumulation amount estimated by the deposit amount estimating means in order to remove the deposit during operation of the internal combustion engine.
- the control apparatus for an internal combustion engine disclosed in Patent Document 3 can effectively remove the deposit because the accumulated deposit is removed during operation of the internal combustion engine. That is, since the butterfly valve body is rotated during the operation of the internal combustion engine in which the gas flow is generated in the gas passage, the deposit scraped by the butterfly valve body can be carried on the gas flow and fly away. . Thereby, the deposit can be effectively removed.
- the above-described conventional control device for an internal combustion engine needs to circulate the EGR gas in the intake passage when the deposit that could not be scraped off by the EGR valve is caught and the EGR valve cannot shift to the fully closed state.
- EGR gas may be mixed in the intake air even in the operation region where there is no operation. For this reason, there is a possibility that the combustion state of the internal combustion engine will be deteriorated, causing fluctuations in the rotation of the internal combustion engine, engine stall, or catalyst damage.
- the conventional exhaust circulation device disclosed in Patent Document 2 has a problem that since the valve body is opened and closed before the internal combustion engine is started, gas does not flow and foreign matters such as deposits are difficult to drop off. there were.
- the conventional exhaust gas circulation device disclosed in Patent Document 3 since the EGR valve is opened and closed for the purpose of removing foreign matter adhering to the EGR valve during engine operation, the flow rate of EGR gas increases rapidly, and the internal combustion engine There was a problem that the combustion state of this was worsened.
- the present invention has been made to solve such problems, and provides a control device for an internal combustion engine that can remove foreign matters such as deposits deposited on an EGR valve without deteriorating the combustion state of the internal combustion engine. With the goal.
- a control device for an internal combustion engine is a control device for an internal combustion engine that circulates a part of the exhaust discharged from the internal combustion engine to the exhaust passage as EGR gas in the intake passage.
- An EGR pipe formed with an EGR passage communicating with the passage and the intake passage, and provided on the exhaust passage side to take a state between an open state and a closed state, and in the closed state, the EGR gas is A first valve that shuts off the flow into the EGR passage, and is provided closer to the intake passage than the first valve, and takes a state between an open state and a closed state;
- the second valve that adjusts the amount flowing into the passage, the foreign matter detection unit that detects whether or not foreign matter has adhered to the second valve, and the foreign matter detection unit have detected that the foreign matter has adhered.
- the valve from the open state characterized in that and a switching unit for switching to the closed state.
- the control device switches the first valve from the open state to the closed state on the condition that the foreign matter detection unit detects that the foreign matter has adhered to the second valve. Even if it is caught, the EGR gas does not flow into the intake passage, and the deterioration of the combustion of the internal combustion engine due to the inflow of the EGR gas can be suppressed. Therefore, it is possible to suppress the rotation fluctuation of the internal combustion engine and the engine stall, and to suppress the catalyst damage and the like.
- the control apparatus for an internal combustion engine further includes a drive unit that drives the second valve between an open state and a closed state, and the drive unit has the foreign matter attached thereto by the foreign matter detection unit.
- the second valve is driven between the open state and the closed state on the condition that the first valve is switched from the open state to the closed state by the switching unit.
- the control device can remove foreign matters such as deposits deposited on the second valve by driving the second valve between the open state and the closed state during operation of the internal combustion engine. Furthermore, since the first valve shifts from the open state to the closed state when foreign matter adheres to the second valve, the second valve is driven between the open state and the closed state to remove the foreign matter. At this time, the flow of EGR gas into the EGR passage is blocked by the first valve. Therefore, the amount of EGR gas does not increase suddenly when removing foreign matters, and deterioration of combustion in the internal combustion engine can be suppressed.
- the foreign object detection unit may be configured such that the change in the pressure of the EGR gas between the open state and the closed state of the second valve is not more than a predetermined value. It is determined that foreign matter has adhered to the second valve.
- the foreign matter detection unit can accurately detect that foreign matter has adhered to the second valve based on a change in the pressure of the EGR gas.
- control device for an internal combustion engine is characterized in that the foreign matter detector detects whether or not foreign matter has adhered to the second valve during fuel cut of the internal combustion engine.
- the foreign matter detection unit detects whether foreign matter has adhered during the fuel cut of the internal combustion engine, so that the influence on the combustion state of the internal combustion engine due to the change in the flow rate of the EGR gas is suppressed. It is possible to detect whether foreign matter is attached to the second valve.
- the foreign matter detection unit may detect foreign matter on the second valve on the condition that the pressure of EGR gas on the downstream side of the second valve is higher than a predetermined value. It is judged that it has adhered.
- the foreign matter detection unit sets the intake pressure value that is normally generated when no foreign matter is attached to the second valve to a predetermined value, and the foreign matter is detected in the second valve based on the pressure of the EGR gas. Adhesion can be detected with high accuracy.
- the foreign matter detector may determine that foreign matter has adhered to the second valve on the condition that a misfire has occurred in the internal combustion engine.
- the foreign matter detector can accurately detect that foreign matter has adhered to the second valve based on whether or not misfire has occurred in the internal combustion engine.
- the control apparatus for an internal combustion engine further includes an opening degree detection unit that detects an opening degree of the second valve, and the foreign object detection unit includes an instruction opening degree for the second valve, It is determined that foreign matter has adhered to the second valve on condition that the difference between the opening degree of the second valve detected by the opening degree detection unit is larger than a predetermined threshold value.
- the foreign matter detection unit can accurately detect that foreign matter has adhered to the second valve based on the difference between the indicated opening degree and the opening degree detected by the opening degree detection unit.
- the control device for an internal combustion engine further includes a detection unit that detects a cooling water temperature of the internal combustion engine, and the switching unit detects that the cooling water temperature detected by the detection unit is less than a threshold value. As a condition, the first valve is closed.
- the switching unit can block the EGR gas from flowing downstream from the first valve, so that condensed water is generated in the vicinity of the second valve. Can be suppressed.
- the switching unit opens the first valve from the closed state on the condition that the coolant temperature detected by the detection unit is equal to or higher than a threshold value. It is characterized by.
- the switching unit changes the first valve from the closed state to the open state, so that EGR gas can be supplied to the EGR passage, and the second valve is opened or closed. Accordingly, the EGR gas can be circulated in the intake passage.
- the drive unit drives the second valve between an open state and a closed state in accordance with a combustion state of the internal combustion engine, and the EGR gas is sucked into the intake air. The amount flowing into the passage is adjusted.
- the amount of EGR gas flowing into the intake passage can be adjusted according to the combustion state of the internal combustion engine, so that the combustion state of the internal combustion engine can be suitably controlled.
- the second valve is in an open state and a closed state on the condition that the drive unit detects that the foreign matter is attached by the foreign matter detection unit.
- the second valve is driven to take repeatedly.
- the driving unit drives the second valve so that the second valve repeatedly takes the open state and the closed state, so that foreign matters such as deposits accumulated on the second valve can be removed.
- the present invention it is possible to provide a control device for an internal combustion engine that can remove foreign matters such as deposits deposited on the EGR valve without deteriorating the combustion state of the internal combustion engine.
- 1 is a schematic configuration diagram illustrating an exhaust gas circulation device for an internal combustion engine according to a first embodiment of the present invention.
- 1 is a schematic block diagram showing an exhaust circulation device according to a first embodiment of the present invention and a configuration around it. It is a flowchart for demonstrating the foreign material removal control which concerns on the 1st Embodiment of this invention. It is a flowchart for demonstrating the foreign material removal control which concerns on the 2nd Embodiment of this invention. It is a flowchart for demonstrating the foreign material removal control which concerns on the 3rd Embodiment of this invention. It is a flowchart for demonstrating the foreign material removal control which concerns on the 4th Embodiment of this invention.
- the engine 1 includes a cylinder head 10 and a cylinder block (not shown), and the cylinder head 10 and the cylinder block form four cylinders 5.
- combustion chambers 7 are respectively defined by pistons.
- the cylinder head 10 is formed with an intake port for introducing outside air into the cylinder 5 and an exhaust port for discharging exhaust gas from the cylinder 5.
- each intake port an injector for injecting fuel is installed, and the injected fuel is mixed with air and introduced into the combustion chamber 7 as an air-fuel mixture.
- the cylinder head 10 is provided with an ignition plug 15 for igniting the air-fuel mixture introduced into each combustion chamber 7.
- the ignition plug 15 is controlled in ignition timing by an ECU (Electronic Control Unit) 100 described later. It is like that.
- the injector is configured by an electromagnetically driven on-off valve. When a predetermined voltage is applied by the ECU 100, the injector is opened and fuel is injected into the intake port of each cylinder 5.
- the engine 1 further has an intake manifold 11 a connected to the cylinder head 10, and the intake manifold 11 a constitutes a part of the intake passage 11.
- the intake passage 11 is provided with an air cleaner and an air flow meter 22 (not shown) in order from the upstream side.
- the intake passage 11 is further provided with a throttle valve 18 for adjusting the intake air amount on the upstream side of the intake manifold 11a.
- an intercooler that forcibly cools intake air whose temperature has been raised by supercharging of a turbo unit 51 described later is installed on the downstream side of the air flow meter 22.
- the throttle valve 18 is constituted by an electronically controlled on-off valve whose opening degree can be adjusted steplessly.
- the flow area of the intake air is reduced under a predetermined condition, and the supply amount of the intake air is reduced. To be adjusted.
- the ECU 100 controls the throttle motor installed in the throttle valve 18 to adjust the opening degree of the throttle valve 18.
- the engine 1 further has an exhaust manifold 12 a connected to the cylinder head 10, and the exhaust manifold 12 a constitutes a part of the exhaust passage 12.
- a catalyst device 13 is disposed in the exhaust passage 12 on the downstream side of the exhaust gas flow of the turbo unit 51.
- the catalyst device 13 is composed of, for example, a three-way catalyst.
- the engine 1 further includes a turbo unit 51.
- the turbo unit 51 includes a turbine wheel 53 that rotates by exhaust flowing through the exhaust passage 12, a compressor wheel 52 that is disposed in the intake passage 11, and a rotor shaft 54 that connects the turbine wheel 53 and the compressor wheel 52. .
- the turbine wheel 53 is rotated by the exhaust gas discharged from the combustion chamber 7, this rotation is transmitted to the compressor wheel 52 via the rotor shaft 54.
- the engine 1 sends not only the negative pressure generated according to the movement of the piston but also the intake air into the combustion chamber 7 by the rotation of the compressor wheel 52.
- the turbo unit 51 is composed of a variable nozzle turbo unit (VNT), and the ECU 100 adjusts the supercharging pressure of the engine 1 by adjusting the opening of a variable nozzle vane mechanism provided on the turbine wheel 53 side. It is supposed to be.
- VNT variable nozzle turbo unit
- the engine 1 further includes an exhaust circulation device (hereinafter referred to as an EGR device) 30.
- the EGR device 30 recirculates a part of the exhaust gas flowing through the exhaust passage 12 to the intake passage 11 and supplies it to the combustion chamber 7 of each cylinder 5 as EGR gas. Thereby, the combustion temperature in the combustion chamber 7 falls, and NOx generation amount reduces. In addition, the pumping loss is reduced and the fuel consumption is improved.
- the EGR device 30 includes an EGR pipe 33 that connects the intake manifold 11a and the exhaust manifold 12a and has an EGR passage 34 formed therein.
- the EGR pipe 33 is provided with an EGR cooler 31 and an EGR valve 32 for cooling the EGR gas flowing through the EGR passage 34 in order from the upstream side of the EGR gas flow.
- the EGR valve 32 is provided with a linear solenoid 32a provided therein and a base end portion inserted through the linear solenoid 32a, and a valve body 32b for opening and closing the EGR passage 34 is provided at the tip portion thereof. And a shaft 32c.
- the shaft 32c is reciprocated in the axial direction by the electromagnetic force and the biasing force of a spring (not shown), and the EGR passage 34 is opened and closed by the valve body 32b.
- the EGR valve 32 in the present embodiment is a normally closed type valve that is opened when the linear solenoid 32a is energized and closed when the linear solenoid 32a is not energized.
- the EGR valve 32 according to the present embodiment constitutes a second valve according to the present invention.
- ECU 100 according to the present embodiment constitutes a switching unit according to the present invention.
- the ECU 100 adjusts the opening degree of the EGR valve 32 so as to connect the exhaust passage 12 and the intake passage 11 to adjust the amount of EGR gas introduced into the intake manifold 11a from the exhaust manifold 12a, that is, the exhaust gas recirculation amount. It has become.
- the EGR cooler 31 has a configuration in which a cooling water pipe is stretched around the outer periphery of the EGR gas passage in the housing.
- the EGR gas supplied from the EGR pipe 33 is cooled by heat exchange with the cooling water flowing through the cooling water pipe when passing through the EGR gas passage, and is guided downstream.
- the EGR device 30 further includes an EGR cutoff valve 35 on the upstream side of the EGR cooler 31.
- the EGR shut-off valve 35 is configured by a valve that can take an open state that is fully open and a closed state that is fully closed, such as a diaphragm valve or an electromagnetically driven valve.
- This EGR shut-off valve 35 shuts off the EGR passage 34 when the EGR valve 32 is fully closed, such as when the engine 1 is warmed up, and the exhaust gas discharged to the exhaust manifold 12a flows into the EGR device 30. To prevent it from happening.
- the EGR cutoff valve 35 is fully opened when the EGR valve 32 is not fully closed.
- the EGR shut-off valve 35 when removing foreign matter during execution of the foreign matter removal control process, takes a fully closed state regardless of whether the EGR valve 32 is open or not. It has become.
- the EGR cutoff valve 35 may be configured by a valve that can take an arbitrary state between an open state and a closed state.
- the EGR cutoff valve 35 according to the present embodiment constitutes a first valve according to the present invention.
- a vehicle equipped with the engine 1 includes a cooling water temperature sensor 21, an air flow meter 22, an intake air temperature sensor 23, a pressure sensor 24, an A / F sensor 25, an exhaust temperature.
- a sensor 26, a throttle opening sensor 27, an accelerator opening sensor 29, a lift sensor 36, an engine speed sensor 37, a vehicle speed sensor 38, and a shut-off valve opening sensor 39 are provided. Each of these sensors outputs a signal representing a detection result to the ECU 100.
- the cooling water temperature sensor 21 is disposed in a water jacket formed in the cylinder block of the engine 1 and outputs a detection signal corresponding to the cooling water temperature THW of the engine 1 to the ECU 100.
- the air flow meter 22 is disposed on the upstream side of the throttle valve 18 in the intake passage 11 and outputs a detection signal corresponding to the intake air amount to the ECU 100.
- the intake air temperature sensor 23 is disposed in the intake manifold 11a, and outputs a detection signal corresponding to the intake air temperature to the ECU 100.
- the pressure sensor 24 is disposed in the intake manifold 11a and outputs a detection signal corresponding to the intake pressure to the ECU 100.
- the A / F sensor 25 is disposed in the exhaust passage 12 upstream of the catalyst device 13 and outputs a detection signal corresponding to the oxygen concentration (exhaust A / F) in the exhaust gas to the ECU 100.
- the exhaust temperature sensor 26 is disposed in the exhaust passage 12 on the downstream side of the catalyst device 13, and outputs a detection signal corresponding to the exhaust temperature to the ECU 100.
- the throttle opening sensor 27 outputs a detection signal corresponding to the opening of the throttle valve 18 to the ECU 100.
- the accelerator opening sensor 29 outputs a detection signal corresponding to the depression amount of the accelerator pedal to the ECU 100.
- the engine speed sensor 37 detects the rotation speed of the crankshaft of the engine 1 and outputs it to the ECU 100 as the engine speed.
- the vehicle speed sensor 38 detects the number of rotations of the wheel and outputs it to the ECU 100 as a signal representing the vehicle speed.
- the lift sensor 36 has a DC-driven resistor and a brush that slides on the surface of the resistor.
- the brush is configured to operate integrally with the shaft 32c of the EGR valve 32.
- the shutoff valve opening sensor 39 outputs a signal corresponding to the opening of the EGR shutoff valve 35 to the ECU 100.
- the ECU 100 includes a CPU 101 (Central Processing Unit), a ROM 102 (Read Only Memory), a RAM (Random Access Memory) 103, a backup RAM 104, and the like as shown in FIG.
- the ECU 100 according to the present embodiment constitutes a part of the control device according to the present invention.
- the ROM 102 executes various control programs including a program for performing exhaust gas recirculation amount control and foreign matter removal control, which will be described later, and a control program for controlling the fuel injection amount for the cylinder 5, and when executing these various control programs.
- a map to be referred to is stored.
- the CPU 101 executes various arithmetic processes based on various control programs and maps stored in the ROM 102.
- the RAM 103 temporarily stores calculation results by the CPU 101, data input from the above-described sensors, and the like.
- the backup RAM 104 is configured by a nonvolatile memory, and stores data to be saved when the engine 1 is stopped, for example.
- the CPU 101, the ROM 102, the RAM 103, and the backup RAM 104 are connected to each other via the bus 107, and are also connected to the input interface 105 and the output interface 106.
- the input interface 105 includes a cooling water temperature sensor 21, an air flow meter 22, an intake air temperature sensor 23, a pressure sensor 24, an A / F sensor 25, an exhaust temperature sensor 26, a throttle opening sensor 27, an accelerator opening sensor 29, and a lift sensor 36.
- An engine speed sensor 37, a vehicle speed sensor 38, and a shut-off valve opening sensor 39 are connected.
- the vehicle may be mounted with an ECU other than ECU 100, and signals output from at least some of these sensors may be input to ECU 100 via another ECU.
- the output interface 106 is connected to the throttle valve 18, the EGR valve 32, the EGR cutoff valve 35, an injector, and the like.
- the ECU 100 executes various controls of the engine 1 including exhaust gas recirculation amount control, fuel injection amount control, foreign matter removal control, and the like based on the outputs of the various sensors described above.
- the ECU 100 determines whether or not the engine 1 is warming up based on a signal input from the coolant temperature sensor 21. That is, ECU 100 according to the present embodiment constitutes a detection unit according to the present invention. When the ECU 100 determines that the cooling water temperature is equal to or higher than the predetermined threshold, the ECU 100 shifts the EGR cutoff valve 35 from the fully closed state to the fully open state.
- the predetermined threshold value is set to a temperature indicating that the warm-up of the engine 1 is generally completed, such as 70 ° C., for example.
- the ECU 100 determines that the coolant temperature is lower than the predetermined threshold value, the ECU 100 shifts the EGR cutoff valve 35 to the fully closed state.
- the ECU 100 monitors the amount of change in negative pressure on the condition that the warm-up of the engine 1 has been completed and fuel cut control is being executed while the vehicle is decelerating.
- the ECU 100 indicates that the signal input from the accelerator opening sensor 29 indicates that the accelerator opening is fully closed, and based on the signals input from the engine speed sensor 37 and the vehicle speed sensor 38, If it is determined that the running state of the vehicle is included in the fuel cut execution region, monitoring of the amount of change in the intake pressure in the intake manifold 11a, that is, the amount of change in the negative pressure is started, and foreign matter is caught. Judge whether or not.
- the fuel cut execution area is stored in advance in the ROM 102 as a fuel cut area map associated with the vehicle speed and the engine speed.
- the ECU 100 shifts the EGR valve 32 to a fully closed state, and acquires a signal Pclose indicating the pressure of EGR gas from the pressure sensor 24.
- the ECU 100 shifts the EGR valve 32 to the fully opened state while keeping the EGR shut-off valve 35 fully opened, and acquires the signal Popen indicating the intake pressure in the fully opened state of the EGR valve 32 from the pressure sensor 24.
- the ECU 100 calculates a difference ⁇ P between Pclose and Popen and determines whether ⁇ P is larger than a threshold value Pth1.
- ECU100 determines that if ⁇ P is larger than the threshold value Pth1, the amount of change in the negative pressure is changed in accordance with the change in the EGR valve 32, and no foreign object is caught in the EGR valve 32. However, if ⁇ P is equal to or less than the threshold value Pth1, it is determined that the negative pressure does not decrease even when the EGR valve 32 shifts to the fully closed state due to foreign matter entering the EGR valve 32. ing. That is, ECU 100 according to the present embodiment constitutes a foreign object detection unit according to the present invention.
- the threshold value Pth1 is a value determined by the configuration of the engine 1, and is obtained in advance by experimental measurement. Specifically, during mode travel, ⁇ P is measured for each engine speed, and a value about 10% smaller than the smallest value of ⁇ P measured is set as the threshold value Pth1.
- the method of determining the threshold is not limited to the above method, and the threshold Pth1 may be calculated using simulation software instead of experimental measurement.
- the ECU 100 determines that the foreign object is caught in the EGR valve 32, the ECU 100 starts the foreign object removal control. Specifically, the ECU 100 first shifts the EGR cutoff valve 35 to a fully closed state. That is, ECU 100 according to the present embodiment constitutes a switching unit according to the present invention.
- the ECU 100 shifts the EGR valve 32 to the fully open state in order to remove the foreign matter attached to the EGR valve 32, and subsequently shifts to the fully closed state. That is, the EGR valve 32 is continuously shifted between the fully open state and the fully closed state, and the removal of foreign matters attached to the EGR valve 32 is promoted.
- the ECU 100 acquires the intake pressure Popen and Pclose in the fully opened state and the fully closed state of the EGR valve 32 from the pressure sensor 24 on the condition that the fuel cut is being performed, and Popen
- a difference ⁇ P from Pclose and determining whether ⁇ P is greater than a threshold value Pth1 it is determined whether or not the foreign matter has been removed.
- difference ⁇ P is smaller than threshold value Pth1
- ECU 100 determines that the foreign matter has not been removed, and repeats the foreign matter removal control.
- the difference ⁇ P is equal to or greater than the threshold value Pth1, it is determined that the removal of the foreign matter is completed, and the exhaust gas recirculation amount control is resumed.
- the ECU 100 may shift the EGR shut-off valve 35 to the fully closed state independently of the execution of the foreign matter removal control when it is determined that the foreign matter is caught as described above. As a result, it is possible to prevent misfire from occurring due to excessive recirculation of the EGR gas to the intake air when the fuel cut is completed, and to set the start timing of the foreign matter removal control flexibly.
- the following processing is executed at a predetermined timing by the CPU 101 constituting the ECU 100 on the condition that the warm-up of the engine 1 has been completed, and a program that can be processed by the CPU 101 is realized.
- the predetermined timing for example, it is executed once per trip.
- EGR / V represents the EGR valve 32
- EGR / SV represents the EGR shut-off valve 35
- C represents a fully closed state
- O represents a fully opened state.
- the ECU 100 first determines whether or not the vehicle is decelerating based on a signal input from the accelerator opening sensor 29 (step S11). Specifically, the ECU 100 determines that the vehicle is decelerating when the signal input from the accelerator opening sensor 29 indicates that the accelerator opening is fully closed.
- step S11 If the ECU 100 determines that the vehicle is decelerating (YES in step S11), the ECU 100 proceeds to step S12. On the other hand, if the ECU 100 determines that the vehicle is not decelerating (NO in step S11), the ECU 100 returns to START.
- the ECU 100 determines whether or not a fuel cut is in progress (step S12). Specifically, the ECU 100 performs a fuel cut of a fuel cut in which the traveling state of the vehicle is predetermined based on signals input from the engine speed sensor 37 and the vehicle speed sensor 38 and a fuel cut area map stored in the ROM 102. It is determined whether it is in the execution area.
- step S12 If the ECU 100 determines that the fuel cut is being executed (YES in step S12), the ECU 100 proceeds to step S13. On the other hand, if the ECU 100 determines that the fuel cut is not being executed (NO in step S12), the ECU 100 proceeds to START.
- the ECU 100 shifts the EGR shut-off valve 35 to a fully open state (step S13).
- the ECU 100 determines whether or not the EGR valve 32 is in a fully closed state (step S14). Specifically, ECU 100 determines whether or not the current opening degree of EGR valve 32 is in a fully closed state based on a signal input from lift sensor 36.
- step S14 When the ECU 100 determines that the EGR valve 32 is in the fully closed state (YES in step S14), the ECU 100 acquires the intake pressure Pclose in the fully closed state of the EGR valve 32 from the pressure sensor 24, and proceeds to step S15. On the other hand, if it is determined that the EGR valve 32 is not in the fully closed state (NO in step S14), the EGR valve 32 is shifted to the fully closed state (step S16), and the EGR valve 32 is in the fully closed state from the pressure sensor 24. After acquiring the intake pressure Pclose, the process proceeds to step S15.
- the ECU 100 shifts the EGR valve 32 to the fully opened state (step S15), and acquires the intake pressure Popen when the EGR valve 32 is fully opened from the pressure sensor 24.
- the ECU 100 calculates the difference ⁇ P between Pclose and Popen, and compares ⁇ P with the threshold value Pth1 (step S17).
- step S17 When the ECU 100 determines that ⁇ P is equal to or less than the threshold value Pth1 (NO in step S17), the ECU 100 proceeds to step S19 in order to eliminate foreign object pinching in the EGR valve 32.
- ECU 100 determines that ⁇ P is larger than threshold value Pth1 (YES in step S17), foreign object pinching has not occurred, and therefore EGR shut-off valve 35 is shifted to a fully open state (step S18). Transition to END. Thereby, the ECU 100 shifts to normal exhaust gas recirculation control that controls the opening degree of the EGR valve 32 in accordance with the combustion state of the engine 1.
- ECU100 will transfer the EGR cutoff valve 35 to a fully closed state first, if it transfers to step S19. Then, the EGR valve 32 is shifted to a fully opened state (step S20), and subsequently is shifted to a fully closed state (step S21).
- step S11 the ECU 100 returns to step S11 again, compares the difference ⁇ P between Popen and Pclose and the threshold value Pth1, and determines whether or not the foreign object pinching has been eliminated.
- the internal combustion engine control apparatus switches the EGR shut-off valve 35 from the open state to the closed state when it is detected that foreign matter has adhered to the EGR valve 32. Even if foreign matter is caught in the EGR valve 32, EGR gas does not flow into the intake passage 11, and deterioration of combustion of the engine 1 due to the inflow of EGR gas can be suppressed. Therefore, the rotation fluctuation of the engine 1 and the engine stall can be suppressed, and catalyst damage and the like can be suppressed.
- the ECU 100 can remove foreign matters such as deposits accumulated on the EGR valve 32 by driving the EGR valve 32 between the open state and the closed state during the operation of the engine 1. Further, when foreign matter adheres to the EGR valve 32, the EGR shut-off valve 35 shifts from the open state to the closed state. Therefore, when the EGR valve 32 is driven between the open state and the closed state to remove the foreign matter.
- the EGR cutoff valve 35 blocks the flow of EGR gas into the EGR passage 34. Therefore, the amount of EGR gas does not increase suddenly when removing foreign matter, and the deterioration of combustion of the engine 1 can be suppressed.
- the ECU 100 can accurately detect that a foreign matter has adhered to the EGR valve 32 based on a change in the pressure of the EGR gas. Further, since the ECU 100 detects whether or not foreign matter has adhered during the fuel cut of the engine 1, the ECU 100 controls the EGR cutoff valve 35 in a state in which the influence on the combustion state of the engine 1 due to the change in the flow rate of the EGR gas is suppressed. It is possible to detect whether or not foreign matter is attached.
- the ECU 100 can block the EGR gas from flowing downstream from the EGR shut-off valve 35 when the cooling water temperature is lower than the threshold value, it is possible to suppress the generation of condensed water near the EGR valve 32.
- the ECU 100 switches the EGR shut-off valve 35 from the closed state to the open state, so that EGR gas can be supplied to the EGR passage 34 and the EGR valve 32 can be opened or closed. This EGR gas can be circulated through the intake passage 11.
- the ECU 100 drives the EGR valve 32 so that the EGR valve 32 repeatedly takes the open state and the closed state, foreign matter such as deposits accumulated on the EGR valve 32 can be removed.
- FIG. 1 a control apparatus according to a second embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.
- control device In the control device according to the second embodiment, the same components as those of the control device according to the first embodiment described above will be described using the same reference numerals as those in the first embodiment. In particular, only the differences will be described in detail.
- the vehicle on which the ECU 100 according to the present embodiment is mounted has an ignition switch 57. Based on the signal input from ignition switch 57, ECU 100 determines whether or not the ignition system is in an ignition ON (IG-ON) state in which the ignition system is energized. When ECU 100 determines that the ignition is ON, ECU 100 detects EGR output pressure P_EGRO regardless of whether the vehicle is decelerating or fuel cut is being executed. In the present embodiment, a case will be described in which ECU 100 detects the intake pressure in intake manifold 11a as EGR output pressure P_EGRO based on a signal input from pressure sensor 24.
- the ECU 100 stores an intake pressure map in which the engine speed, the engine load, the opening degree of the EGR valve 32, and the threshold value Pth2 of the EGR output pressure P_EGR are associated with each other in the ROM 102.
- This threshold value Pth2 is calculated by adding a margin for avoiding erroneous detection caused by a measurement error to the value of the intake pressure normally generated in the intake manifold 11a when no foreign object is caught in the EGR valve 32. Is done.
- the value of the normally generated intake pressure is obtained in advance by experimental measurement in accordance with the engine speed, the engine load, and the opening degree of the EGR valve 32. Therefore, the EGR output pressure P_EGR becomes a value larger than the threshold value Pth2 when foreign matter is caught in the EGR valve 32.
- the ECU 100 determines that the value detected by the pressure sensor 24 is greater than the threshold value Pth2, the ECU 100 determines that foreign matter is caught in the EGR valve 32.
- the ECU 100 determines that the foreign object is caught in the EGR valve 32, the ECU 100 shifts the EGR shut-off valve 35 to the fully closed state in order to eliminate the foreign object caught, as in the first embodiment.
- the EGR valve 32 is shifted to the fully open state, and subsequently shifted to the fully closed state. Therefore, even if the fuel cut ends during the execution of the foreign matter removal control and the combustion of the fuel in each combustion chamber 7 is restarted, the state where the EGR gas is not allowed to flow into the intake port, that is, the combustion state is affected. Foreign matter can be removed in a suppressed state.
- the following processing is executed at a predetermined timing on the condition that the warm-up of the engine 1 is completed by the CPU 101 constituting the ECU 100, and a program that can be processed by the CPU 101 is realized.
- the predetermined timing for example, it is executed once per trip from ignition ON to ignition OFF.
- EGR / V represents the EGR valve 32
- EGR / SV represents the EGR cutoff valve 35
- C represents the fully closed state
- O represents the fully opened state.
- the ECU 100 first determines whether or not the ignition is ON based on a signal input from the ignition switch 57 (step S31).
- step S31 If the ECU 100 determines that the ignition is ON (YES in step S31), the ECU 100 proceeds to step S32. On the other hand, if the ECU 100 determines that the ignition is not ON (NO in step S31), the ECU 100 returns to START.
- the ECU 100 determines whether or not the EGR output pressure P_EGR0 is larger than the threshold value Pth2 (step S32). Specifically, when ECU 100 calculates the engine speed and the engine load based on signals input from engine speed sensor 37 and airflow meter 22, ECU 100 refers to the EGR output pressure map stored in ROM 102. Then, it is determined whether or not the EGR output pressure P_EGR is larger than the threshold value Pth2.
- Step S32 When the ECU 100 determines that the EGR output pressure P_EGR0 is larger than the threshold value Pth2 (YES in step S32), the ECU 100 proceeds to step S33. On the other hand, when ECU 100 determines that EGR output pressure P_EGR is equal to or less than threshold value Pth2 (NO in step S32), ECU 100 determines that no foreign object is caught in EGR valve 32, and EGR cutoff valve 35 is fully opened. (Step S36), the process proceeds to END.
- step S33 the ECU 100 shifts the EGR shut-off valve 35 to a fully closed state in order to eliminate foreign object pinching in the EGR valve 32. Then, the EGR valve 32 is shifted to the fully opened state (step S34), and subsequently is shifted to the fully closed state (step S35).
- the ECU 100 returns to step S31 and compares the EGR output pressure P_EGR0 with the threshold value Pth2 on the condition that the ignition is ON, and determines whether or not the foreign object pinching has been resolved.
- control apparatus for an internal combustion engine sets the intake pressure value that normally occurs when no foreign matter is attached to the EGR valve 32 to a predetermined value, Based on the gas pressure, it is possible to accurately detect that a foreign substance has adhered to the EGR valve 32.
- the ECU 100 determines whether the ignition is ON based on the signal input from the ignition switch 57 has been described.
- the vehicle has a power switch that takes one of the power OFF, ACC, and IG-ON states when the driver presses, and the ECU 100 is based on a signal input from an ECU connected to the power switch. It may be determined whether or not the ignition is ON.
- the ECU 100 may detect foreign object pinching in the EGR valve 32 based on whether or not misfire has occurred.
- control device In the control device according to the third embodiment, the same components as those of the control device according to the first embodiment described above will be described using the same reference numerals as those in the first embodiment. In particular, only the differences will be described in detail.
- the ECU 100 determines whether or not a misfire has occurred in any of the cylinders 5.
- Whether misfire has occurred or not is calculated, for example, by calculating the time required for the crankshaft to rotate at a predetermined angle in the combustion stroke of each cylinder 5 from the engine speed sensor 37, for example, 180 ° CA time. If the 180 ° CA time exceeds the predetermined time, it is determined that misfire has occurred in the cylinder 5.
- the predetermined time may be set based on, for example, an average value of 180 ° CA time of all the cylinders 5.
- the correspondence between the engine speed and the 180 ° CA time in a state where no misfire has occurred is obtained in advance by experimental measurement, and the ECU 100 determines the 180 ° CA time corresponding to the engine speed at the time of misfire determination. May be referred to.
- the following processing is executed at a predetermined timing on the condition that the warm-up of the engine 1 is completed by the CPU 101 constituting the ECU 100, and a program that can be processed by the CPU 101 is realized.
- the predetermined timing for example, it is executed once per trip.
- EGR / V represents the EGR valve 32
- EGR / SV represents the EGR cutoff valve 35
- C represents the fully closed state
- O represents the fully opened state.
- the ECU 100 first determines whether or not the ignition is ON based on a signal input from the ignition switch 57 (step S41).
- step S41 If the ECU 100 determines that the ignition is on (YES in step S41), the ECU 100 proceeds to step S42. On the other hand, if the ECU 100 determines that the ignition is not ON (NO in step S41), the ECU 100 returns to START.
- the ECU 100 determines whether or not misfire has occurred in any of the cylinders 5 (step S42). Specifically, ECU 100 calculates 180 ° CA time in the combustion stroke of each cylinder 5 based on a signal input from engine speed sensor 37, and when this 180 ° CA time exceeds a predetermined time. It is determined that a misfire has occurred.
- step S42 If the ECU 100 determines that a misfire has occurred in any of the cylinders 5 (YES in step S42), the ECU 100 proceeds to step S43. On the other hand, when the ECU 100 determines that no misfire has occurred in any of the cylinders 5 (NO in step S42), the ECU 100 determines that no foreign matter is caught in the EGR valve 32, and the EGR shut-off valve 35 is set. Transition to the fully open state and transition to END.
- step S43 the ECU 100 shifts the EGR shut-off valve 35 to a fully closed state in order to eliminate foreign object pinching in the EGR valve 32. Then, the EGR valve 32 is shifted to the fully open state (step S44), and subsequently is shifted to the fully closed state (step S45).
- step S41 the ECU 100 returns to step S41 and determines whether or not the foreign object pinching has been resolved based on the above-described misfire determination, on condition that the ignition is ON.
- control apparatus for an internal combustion engine can accurately detect that foreign matter has adhered to the EGR valve 32 based on whether or not misfire has occurred in the engine 1.
- the foreign object pinching in the EGR valve 32 may be detected based on the lift amount of the EGR valve 32.
- FIG. 1 a control device according to a fourth embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.
- control device In the control device according to the fourth embodiment, the same components as those of the control device according to the first embodiment described above will be described using the same reference numerals as those in the first embodiment. In particular, only the differences will be described in detail.
- ECU 100 determines that the ignition is ON based on a signal input from ignition switch 57, ECU 100 obtains a signal representing actual opening VRreal of EGR valve 32 from lift sensor 36. Then, the commanded opening VRtarget for the currently set EGR valve 32 is referred to. When the actual opening VRreal of the EGR valve 32 is larger than the reference value VRref, the ECU 100 determines that foreign matter is caught in the EGR valve 32.
- the reference value VRref is set to a value obtained by adding a margin corresponding to a detection error of the lift sensor 36 to the instruction opening VRtarget for the EGR valve 32.
- the ECU 100 determines that the foreign objects are the same as in the first embodiment. A removal control process is executed.
- the following processing is executed at a predetermined timing on the condition that the warm-up of the engine 1 is completed by the CPU 101 constituting the ECU 100, and a program that can be processed by the CPU 101 is realized.
- the predetermined timing for example, it is executed once per trip.
- EGR / V is the EGR valve 32
- EGR / SV is the EGR shut-off valve 35
- L / S is the lift sensor 36
- C is the fully closed state
- O Represents the fully open state.
- the ECU 100 first determines whether or not the ignition is ON based on a signal input from the ignition switch 57 (step S51).
- step S51 If the ECU 100 determines that the ignition is on (YES in step S51), the ECU 100 proceeds to step S52. On the other hand, if the ECU 100 determines that the ignition is not ON (NO in step S51), the ECU 100 returns to START.
- the ECU 100 determines whether or not the actual opening VRreal of the EGR valve 32 is larger than the reference value VRref (step S52). Specifically, the ECU 100 acquires the actual opening VRreal of the EGR valve 32 based on a signal input from the lift sensor 36. Further, the ECU 100 refers to the instruction opening VRtarget currently set for the EGR valve 32, and calculates a reference value VRref by adding a margin to the instruction opening VRtarget. When the actual opening VRreal exceeds the reference value VRref, the ECU 100 determines that foreign matter is caught in the EGR valve 32.
- step S52 When the ECU 100 determines that the actual opening VRreal is larger than the reference value VRref (YES in step S52), the ECU 100 proceeds to step S53. On the other hand, when ECU 100 determines that actual opening VRreal is equal to or smaller than reference value VRref (NO in step S52), ECU 100 determines that no foreign matter is caught in EGR valve 32, and EGR cutoff valve 35 is operated. The process shifts to the fully open state (step S56), and shifts to END.
- ECU100 will transfer the EGR cutoff valve 35 to a fully-closed state, in order to eliminate the foreign material pinching in the EGR valve 32, when transfering to step S53. Then, the EGR valve 32 is shifted to a fully opened state (step S54), and subsequently is shifted to a fully closed state (step S55).
- the ECU 100 returns to step S51 and, on the condition that the ignition is ON, compares the actual opening VRreal of the EGR valve 32 with the reference value VRref and determines whether or not the foreign object pinching has been resolved.
- control apparatus for an internal combustion engine has a foreign object in the second valve based on the difference between the indicated opening and the opening detected by the opening detector. Adhesion can be detected with high accuracy.
- the EGR device 30 constitutes a so-called HPL (High-Pressure Loop) that acquires exhaust gas from the upstream side of the turbine wheel 53 and recirculates it as EGR gas to the downstream side of the compressor wheel 52.
- HPL High-Pressure Loop
- LPL Low-Pressure Loop
- the ECU 100 executes the foreign matter removal control process when the warm-up of the engine 1 has been described has been described.
- the present invention is not limited to this, and the ECU 100 always executes the foreign matter removal control process. At the same time, it may be determined whether or not the warm-up is completed in the foreign matter removal control process.
- the EGR apparatus 30 demonstrated the case where it applied to the vehicle carrying the engine 1 comprised by the gasoline engine, it is not limited to this,
- the EGR apparatus 30 mounts well-known internal combustion engines, such as a diesel engine. It may be applied to the vehicle.
- the EGR device 30 is applied to a port injection engine in which fuel is injected into the intake port.
- the present invention is not limited to this, and fuel is directly injected into each combustion chamber 7.
- the EGR device 30 may be applied to an in-cylinder injection engine. Further, the EGR device 30 may be applied to an engine in which both in-cylinder injection and port injection are performed.
- the EGR device 30 may be applied not only to a vehicle that uses only the engine 1 as a power source, but also to a hybrid vehicle that uses an engine and a rotating electric machine as power sources.
- the failure diagnosis device for an internal combustion engine has an effect of improving the failure determination accuracy for each cylinder, and is useful for a control device for an internal combustion engine that detects a failure of each cylinder. It is.
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Abstract
Description
11 吸気通路
11a 吸気マニホールド
12 排気通路
12a 排気マニホールド
18 スロットルバルブ
21 冷却水温センサ
22 エアフロメータ
24 圧力センサ
27 スロットル開度センサ
29 アクセル開度センサ
30 EGR装置
32 EGRバルブ
33 EGR管
34 EGR通路
35 EGR遮断弁
36 リフトセンサ
37 エンジン回転数センサ
38 車速センサ
39 遮断弁開度センサ
57 イグニッションスイッチ
100 ECU
Claims (11)
- 内燃機関から排気通路に排出された排気の一部をEGRガスとして吸気通路に循環させる内燃機関の制御装置であって、
前記排気通路と前記吸気通路とを連通するEGR通路が形成されたEGR管と、
前記排気通路側に設けられ、開状態と閉状態との間の状態を取るとともに、前記閉状態において前記EGRガスが前記EGR通路に流入するのを遮断する第1の弁と、
前記第1の弁よりも前記吸気通路側に設けられ、開状態と閉状態との間の状態を取るとともに、前記EGRガスが前記吸気通路に流入する量を調整する第2の弁と、
前記第2の弁に異物が付着したか否かを検出する異物検出部と、
前記異物検出部により、前記異物が付着したと検出されたことを条件として前記第1の弁を開状態から閉状態に切り換える切換え部と、を備えたことを特徴とする内燃機関の制御装置。 - 前記第2の弁を開状態と閉状態との間で駆動させる駆動部をさらに備え、
前記駆動部は、前記異物検出部により前記異物が付着したと検出され前記切換え部により前記第1の弁が開状態から閉状態に切り換えられたことを条件に、前記第2の弁を開状態と閉状態との間で駆動させるようにしたことを特徴とする請求項1に記載の内燃機関の制御装置。 - 前記異物検出部は、前記第2の弁の開状態と閉状態における前記EGRガスの圧力の変化が所定値以下であることを条件として前記第2の弁に異物が付着したと判断することを特徴とする請求項1または請求項2に記載の内燃機関の制御装置。
- 前記異物検出部は、前記内燃機関のフューエルカット中に前記第2の弁に異物が付着したか否かを検出することを特徴とする請求項3に記載の内燃機関の制御装置。
- 前記異物検出部は、前記第2の弁の下流側におけるEGRガスの圧力が所定値よりも高いことを条件として前記第2の弁に異物が付着したと判断することを特徴とする請求項1または請求項2に記載の内燃機関の制御装置。
- 前記異物検出部は、前記内燃機関に失火が発生していることを条件として、前記第2の弁に異物が付着したと判断することを特徴とする請求項1または請求項2に記載の内燃機関の制御装置。
- 前記第2の弁の開度を検出する開度検出部をさらに備え、
前記異物検出部は、前記第2の弁に対する指示開度と、前記開度検出部により検出された前記第2の弁の開度との差が所定の閾値より大きいことを条件として、前記第2の弁に異物が付着したと判断することを特徴とする請求項1または請求項2に記載の内燃機関の制御装置。 - 前記内燃機関の冷却水温を検知する検知部をさらに備え、
前記切換え部は、前記検知部により検知された前記冷却水温が閾値未満であることを条件として前記第1の弁を閉状態にすることを特徴とする請求項1ないし請求項7のいずれか1の請求項に記載の内燃機関の制御装置。 - 前記切換え部は、前記検知部により検知された冷却水温が閾値以上であることを条件として前記第1の弁を閉状態から開状態にすることを特徴とする請求項1ないし請求項8のいずれか1の請求項に記載の内燃機関の制御装置。
- 前記駆動部は、前記内燃機関の燃焼状態に応じて前記第2の弁を開状態と閉状態との間で駆動し、前記EGRガスが吸気通路に流入する量を調整することを特徴とする請求項1から請求項9のいずれか1の請求項に記載の内燃機関の制御装置。
- 前記駆動部は、前記異物検出部により前記異物が付着したと検出されたことを条件として、前記第2の弁が開状態と閉状態とを繰り返し取るよう前記第2の弁を駆動することを特徴とする請求項1から請求項10のいずれか1の請求項に記載の内燃機関の制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP11858136.2A EP2674597A4 (en) | 2011-02-08 | 2011-02-08 | CONTROL DEVICE FOR A COMBUSTION ENGINE |
US13/984,161 US9212631B2 (en) | 2011-02-08 | 2011-02-08 | Control apparatus of internal combustion engine |
JP2012556649A JP5626370B2 (ja) | 2011-02-08 | 2011-02-08 | 内燃機関の制御装置 |
CN2011800670120A CN103348118A (zh) | 2011-02-08 | 2011-02-08 | 内燃机的控制装置 |
PCT/JP2011/000686 WO2012107950A1 (ja) | 2011-02-08 | 2011-02-08 | 内燃機関の制御装置 |
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PCT/JP2011/000686 WO2012107950A1 (ja) | 2011-02-08 | 2011-02-08 | 内燃機関の制御装置 |
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US (1) | US9212631B2 (ja) |
EP (1) | EP2674597A4 (ja) |
JP (1) | JP5626370B2 (ja) |
CN (1) | CN103348118A (ja) |
WO (1) | WO2012107950A1 (ja) |
Cited By (5)
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JP2018530700A (ja) * | 2015-10-02 | 2018-10-18 | フレックス フューエル − エナジー デベロップメント | 内燃機関の脱スケールのためのシステム |
JP2018204483A (ja) * | 2017-06-01 | 2018-12-27 | 日野自動車株式会社 | Egr弁制御装置 |
CN109883716A (zh) * | 2017-12-06 | 2019-06-14 | 通用汽车环球科技运作有限责任公司 | 用于测量和计算来自汽油发动机的颗粒物输出的技术和方法 |
JP2020066995A (ja) * | 2018-10-22 | 2020-04-30 | 株式会社豊田自動織機 | 内燃機関の制御システム |
JP2021071053A (ja) * | 2019-10-29 | 2021-05-06 | トヨタ自動車株式会社 | ハイブリッド車両 |
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CN103717464B (zh) * | 2011-07-28 | 2017-03-22 | 丰田自动车株式会社 | 混合动力车辆的发动机停止控制装置 |
US10174719B2 (en) * | 2012-08-01 | 2019-01-08 | Nissan Motor Co., Ltd. | Control device for internal combustion engine |
JP6486524B1 (ja) * | 2018-03-13 | 2019-03-20 | 愛三工業株式会社 | エンジンシステム |
JP7134114B2 (ja) * | 2019-02-19 | 2022-09-09 | 愛三工業株式会社 | エンジンのegr装置 |
JP7196814B2 (ja) * | 2019-10-17 | 2022-12-27 | トヨタ自動車株式会社 | 車両 |
KR20210061843A (ko) * | 2019-11-20 | 2021-05-28 | 현대자동차주식회사 | Egr 밸브의 진단 장치 및 이를 이용한 방법 |
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- 2011-02-08 CN CN2011800670120A patent/CN103348118A/zh active Pending
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CN109883716A (zh) * | 2017-12-06 | 2019-06-14 | 通用汽车环球科技运作有限责任公司 | 用于测量和计算来自汽油发动机的颗粒物输出的技术和方法 |
CN109883716B (zh) * | 2017-12-06 | 2021-03-02 | 通用汽车环球科技运作有限责任公司 | 用于测量和计算来自汽油发动机的颗粒物输出的技术和方法 |
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Also Published As
Publication number | Publication date |
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EP2674597A4 (en) | 2014-08-06 |
CN103348118A (zh) | 2013-10-09 |
JPWO2012107950A1 (ja) | 2014-07-03 |
US9212631B2 (en) | 2015-12-15 |
EP2674597A1 (en) | 2013-12-18 |
JP5626370B2 (ja) | 2014-11-19 |
US20130312719A1 (en) | 2013-11-28 |
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