WO2011132264A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- WO2011132264A1 WO2011132264A1 PCT/JP2010/057004 JP2010057004W WO2011132264A1 WO 2011132264 A1 WO2011132264 A1 WO 2011132264A1 JP 2010057004 W JP2010057004 W JP 2010057004W WO 2011132264 A1 WO2011132264 A1 WO 2011132264A1
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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
- F02D23/02—Controlling engines characterised by their being supercharged the engines being of fuel-injection type
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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
- F02D13/0261—Controlling the valve overlap
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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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- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/03—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of low temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/16—Other safety measures for, or other control of, pumps
- F02B2039/162—Control of pump parameters to improve safety thereof
- F02B2039/164—Control of pump parameters to improve safety thereof the temperature of the pump, of the pump drive or the pumped fluid being limited
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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
- 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
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the 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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- This invention relates to a control device for an internal combustion engine. More specifically, the present invention relates to a control device for an internal combustion engine including a variable valve mechanism that can variably control the opening characteristics of an exhaust valve or an intake valve and a turbocharger.
- Patent Document 1 discloses a control device for an internal combustion engine including a turbocharger.
- a waste gate valve hereinafter referred to as “WGV”) for bypassing the turbocharger is provided in the exhaust path of the internal combustion engine.
- WGV waste gate valve
- the valve overlap amount of, for example, an intake valve and an exhaust valve is increased after the WGV is opened.
- the WGV is controlled to be closed after, for example, reducing the valve overlap amount.
- the area around the turbocharger's exhaust turbine tends to become hot due to the rotation of the turbine by exhaust gas.
- the use of a material having high heat resistance for the turbine and its peripheral components (turbine and turbine housing) is not preferable from the viewpoint of cost reduction.
- the fuel injection amount By increasing the fuel injection amount, the exhaust gas temperature can be lowered by the heat of vaporization of the fuel.
- the rich state of the catalyst is continued due to the excessive supply of fuel, the amount of oxygen stored in the catalyst is reduced, and HC cannot be purified. Accordingly, excessive supply of fuel is not preferable from the viewpoint of exhaust emission improvement and fuel consumption improvement.
- the control of the WGV opening and the control of the valve overlap amount in Patent Document 1 improve the deterioration of the combustion state in the transition period, but do not consider the temperature of the exhaust system.
- the WGV is opened with the valve overlap amount increased as in Patent Document 1 above
- the blown-through air and unburned fuel flow through the exhaust system, and particularly react upstream of the purification catalyst. Become. In such a case, it is conceivable that the catalyst is overheated and deteriorated by heat of reaction.
- the temperature of the blown-out gas is usually lower than the exhaust gas after combustion. Therefore, for example, when a blow-through occurs in a warm-up process in which only the upstream side of the catalyst is in an active state, the temperature of the catalyst is lowered by the gas entering the catalyst and is cooled down to the upstream side of the catalyst, thereby purifying the catalyst. It is conceivable that the performance decreases.
- an object of the present invention is to solve the above-mentioned problems, and an internal combustion engine control apparatus improved so as to suppress an excessively high temperature state or a low temperature state around an exhaust turbine or a catalyst temperature while suppressing excessive fuel injection. Is to provide.
- a first invention is a control device for an internal combustion engine, An inlet temperature detecting means for detecting an inlet temperature which is a temperature in the vicinity of the inlet of the purification catalyst installed in the exhaust path of the internal combustion engine; Turbine temperature detection means for detecting a turbine temperature that is upstream from the vicinity of the inlet of the purification catalyst and that is near the exhaust turbine of the turbocharger installed in the exhaust path; An overlap control means for controlling a valve overlap in which the intake valve and the exhaust valve of the internal combustion engine are simultaneously open; An inlet high temperature determination means for determining whether or not the inlet temperature is lower than an inlet high temperature reference value; Turbine high temperature determination means for determining whether or not the turbine temperature is higher than a turbine high temperature reference value higher than the inlet high temperature reference value;
- the overlap control means includes When it is determined that the inlet temperature is lower than the inlet high temperature reference value and the turbine temperature is higher than the turbine high temperature reference value, the valve overlap amount is set to be larger than the turbine high temperature reference
- Outlet temperature detection means for detecting an outlet temperature which is a temperature in the vicinity of the outlet of the purification catalyst, downstream from the vicinity of the inlet of the purification catalyst;
- Fuel increase determination means for determining whether or not the outlet temperature is higher than a fuel increase temperature reference value that is higher than the inlet high temperature reference value and lower than the turbine high temperature reference value;
- Fuel injection amount control means for increasing the fuel injection amount supplied to the internal combustion engine when it is determined that the outlet temperature is higher than the fuel increase temperature reference value; Is further provided.
- Outlet temperature detecting means for detecting an outlet temperature which is a temperature in the vicinity of the outlet of the purification catalyst;
- An opening degree detecting means for detecting an opening degree of a waste gate valve for opening and closing a bypass path for bypassing the exhaust turbine;
- Outlet high temperature determining means for determining whether or not the outlet temperature is higher than an outlet high temperature reference value;
- Opening degree determining means for determining whether or not the opening degree is larger than a first opening degree reference value;
- the overlap control means includes When it is determined that the outlet temperature is higher than the outlet high temperature reference value and it is determined that the opening is not larger than the first opening reference value, the valve overlap amount is determined as the outlet high temperature.
- the valve overlap amount is set to It is limited to be smaller than the second reference amount when the outlet is hot and smaller than one reference amount.
- An opening degree detecting means for detecting an opening degree of a waste gate valve for opening and closing a bypass path for bypassing the exhaust turbine;
- An inlet low temperature determining means for determining whether the inlet temperature is lower than an inlet low temperature reference value lower than the inlet high temperature reference value;
- Turbine low temperature determination means for determining whether the turbine temperature is lower than a turbine low temperature reference value lower than the turbine high temperature reference value;
- a second opening determining means for determining whether or not the opening is smaller than a second opening reference value;
- the overlap control means includes It is determined that the inlet temperature is lower than the inlet low temperature reference value, it is determined that the turbine temperature is not lower than the turbine low temperature reference value, and the opening degree is the second opening degree.
- the valve overlap amount is limited to be smaller than the first reference amount at low temperature, When it is determined that the inlet temperature is lower than the inlet low temperature reference value and the turbine temperature is lower than the turbine low temperature reference value, or the inlet temperature is lower than the inlet low temperature reference value And when it is determined that the opening is not smaller than the second opening reference value, the valve overlap amount is set at a low temperature smaller than the first reference amount at the low temperature. Limit smaller than the second reference amount.
- a fifth invention is a control device for an internal combustion engine, Outlet temperature detection means for detecting an outlet temperature which is a temperature in the vicinity of the outlet of the purification catalyst installed in the exhaust path of the internal combustion engine; Turbine temperature detecting means for detecting a turbine temperature that is a temperature in the vicinity of an exhaust turbine of a turbocharger installed upstream of the purification catalyst in the exhaust path; An opening degree detecting means for detecting an opening degree of a waste gate valve for opening and closing a bypass path for bypassing an exhaust turbine of the turbocharger; An overlap control means for controlling a valve overlap in which the intake valve and the exhaust valve of the internal combustion engine are simultaneously open; Outlet high temperature determining means for determining whether or not the outlet temperature is higher than an outlet high temperature reference value; Opening degree determining means for determining whether the opening degree is larger than a first opening degree reference value,
- the overlap control means includes When it is determined that the outlet temperature is higher than the outlet high temperature reference value and it is determined that the opening is not larger than the first opening reference value, the valve overlap amount
- the valve overlap amount is set as the outlet high temperature value. Limiting to be smaller than the second reference amount at the time of high outlet temperature that is smaller than the first reference amount.
- a sixth invention is a control device for an internal combustion engine, An inlet temperature detecting means for detecting an inlet temperature which is a temperature in the vicinity of the inlet of the purification catalyst installed in the exhaust path of the internal combustion engine; Turbine temperature detection means for detecting a turbine temperature that is a temperature upstream from the vicinity of the inlet and is a temperature in the vicinity of an exhaust turbine of a turbocharger installed in the exhaust path; An opening degree detecting means for detecting an opening degree of a waste gate valve for opening and closing a bypass path for bypassing an exhaust turbine of a turbocharger installed in the exhaust path; An overlap control means for controlling a valve overlap in which the intake valve and the exhaust valve of the internal combustion engine are simultaneously open; An inlet low temperature determining means for determining whether or not the inlet temperature is lower than an inlet low temperature reference value; Turbine low temperature determining means for determining whether or not the turbine temperature is lower than a turbine low temperature reference value; Second opening degree determining means for determining whether or not the opening degree is smaller than a
- the valve overlap amount is limited to be smaller than the first reference amount at low temperature, When it is determined that the inlet temperature is lower than the inlet low temperature reference value and the turbine temperature is lower than the turbine low temperature reference value, or the inlet temperature is lower than the inlet low temperature reference value And when it is determined that the opening is not smaller than the second opening reference value, the valve overlap amount is set at a low temperature smaller than the first reference amount at the low temperature. Limit smaller than the second reference amount.
- the control for increasing the fuel injection amount is performed.
- the purification catalyst becomes excessively high in temperature
- the exhaust gas having a low temperature due to the heat of vaporization of the fuel can be circulated through the exhaust path. Therefore, it is possible to prevent the purification catalyst from becoming excessively hot due to the exhaust gas that has become hot due to passage through the exhaust turbine.
- the valve overlap amount is limited to the reference amount, and the opening degree of the waste gate valve is opened.
- the valve overlap amount is limited to be smaller.
- the amount of gas passing through the exhaust turbine before reaching the purification catalyst can be increased. Reaction with fuel can be promoted. Therefore, reaction in the purification catalyst can be suppressed, and excessive temperature rise of the purification catalyst can be suppressed.
- the valve overlap amount is limited, and when the turbine temperature is lower than the temperature reference value, or the waste gate valve opening degree. When is large, the valve overlap amount is limited to be smaller.
- the temperature is as low as the purification catalyst inlet temperature, it is possible to suppress the temperature drop of the exhaust gas due to blow-through, and it is possible to prevent the purification catalyst temperature from being further lowered by the low temperature gas.
- the exhaust turbine temperature is lower than the temperature reference value, an increase in the temperature of the exhaust gas due to passage through the exhaust turbine cannot be expected.
- the valve overlap amount is further limited to be small, so that it is possible to prevent the temperature of the exhaust gas from being lowered due to blow-through and introduce a high-temperature gas into the purification catalyst. And the temperature drop of the purification catalyst can be suppressed.
- Embodiment 1 of this invention It is a schematic diagram for demonstrating the control apparatus and peripheral device of the internal combustion engine in Embodiment 1 of this invention. It is a timing chart for demonstrating the control content in Embodiment 1 of this invention. It is a flowchart for demonstrating the control routine which a control apparatus performs in Embodiment 1 of this invention. It is a timing chart for demonstrating the control content in Embodiment 2 of this invention. It is a flowchart for demonstrating the control routine which a control apparatus performs in Embodiment 2 of this invention. It is a timing chart for demonstrating the control content in Embodiment 3 of this invention. It is a flowchart for demonstrating the control routine which a control apparatus performs in Embodiment 3 of this invention.
- FIG. 1 is a schematic diagram for explaining an overall configuration of a system including a control device for an internal combustion engine and peripheral devices thereof according to Embodiment 1 of the present invention.
- the system of FIG. 1 includes an internal combustion engine 2.
- the internal combustion engine 2 has four cylinders # 1 to # 4.
- the internal combustion engine 2 is provided with a fuel injection valve for in-cylinder injection that can directly inject fuel into each cylinder.
- variable valve mechanism (VVT) 4 for changing the valve opening characteristics (opening / closing timing, lift amount, etc.) is installed in the intake valve and the exhaust valve of each cylinder of the internal combustion engine 2.
- VVT 4 Various configurations and operations of the VVT 4 are known, and a detailed description thereof will be omitted here.
- each cylinder is connected to the exhaust path 10.
- An exhaust turbine 14 of a turbocharger 12 that compresses fresh air using exhaust gas energy is installed in the exhaust path 10.
- the exhaust path 10 is provided with a bypass portion 16 that bypasses the exhaust turbine 14.
- the inlet side of the bypass part 16 communicates with the exhaust path 10 upstream of the exhaust turbine 14, and the outlet side of the bypass part 16 communicates with the exhaust path 10 again downstream of the exhaust turbine 14.
- a WGV 18 (a waste gate valve) for opening and closing the inlet of the bypass unit 16 is provided in the vicinity of the connecting portion on the upstream side of the bypass unit 16 with the exhaust path 10.
- a purification catalyst 20 is connected downstream of the exhaust turbine 14 in the exhaust path 10. Temperature sensors 22, 24, and 26 for detecting temperatures are installed near the exhaust turbine 14 in the exhaust path 10, upstream in the purification catalyst 20, and downstream in the purification catalyst 20, respectively. Each of the temperature sensors 22, 24, and 26 is a sensor that generates an output corresponding to the temperature.
- the control system of the internal combustion engine 2 includes an ECU (Electronic Control Unit) 30.
- the ECU 30 is a control device that comprehensively controls the entire system of the internal combustion engine 2.
- Various actuators are connected to the output side of the ECU 30, and sensors such as temperature sensors 22, 24, and 26, a supercharging pressure sensor, an exhaust pressure sensor, an exhaust temperature sensor, and a knock sensor are connected to the input side of the ECU 30. ing.
- the ECU 30 receives signals from the sensors and operates the actuators according to a predetermined control program. There are many actuators and sensors connected to the ECU 30, but the description thereof is omitted in this specification.
- the control executed by the ECU 30 as the control device in the first embodiment includes the opening degree control of the WGV 18.
- the WGV 18 is closed when there is a command requesting high supercharging, such as when high torque is required during acceleration or the like.
- the entire amount of exhaust gas is introduced to the exhaust turbine 14 side.
- the intake gas is supercharged at a high supercharging pressure due to the high rotation of the exhaust turbine 14.
- the WGV 18 is opened to a predetermined opening according to the operating state.
- a part (or all amount) of the exhaust gas is guided to the bypass unit 16 side, bypasses the exhaust turbine 14, and flows into the exhaust path 10 again downstream from the exhaust turbine 14.
- the control executed by the ECU 30 in the first embodiment further includes control for controlling the valve overlap amount in accordance with the temperature state of the exhaust system obtained from the outputs of the temperature sensors 22, 24, and 26.
- the valve overlap means a state in which the intake valve and the exhaust valve are simultaneously opened and the intake port and the exhaust port are opened simultaneously.
- the valve overlap is controlled at a predetermined timing by the VVT 4 installed in each of the intake valve and the exhaust valve of the internal combustion engine 2.
- the temperature around the exhaust turbine 14 detected in accordance with the output of the temperature sensor 22 is referred to as “turbine temperature”, and the purification catalyst detected in accordance with the output of the temperature sensor 24.
- the temperature near the upstream side of 20 is referred to as “inlet temperature”, and the temperature near the downstream side of the purification catalyst 20 detected according to the output of the temperature sensor 26 is referred to as “outlet temperature”.
- FIG. 2 is a timing chart for explaining the control content of the valve overlap amount in the first embodiment of the present invention.
- the example shown in FIG. 2 is control performed to reduce the temperature around the exhaust turbine 14 when the temperature around the exhaust turbine 14 is high.
- the turbine temperature t2 becomes higher than the temperature reference value T21 (turbine high temperature reference value), and at this time, the inlet temperature t3 is changed to the temperature reference value T31 (inlet high temperature). If it is lower than the temperature reference value), the valve overlap amount v is increased until it becomes larger than the reference amount V0 (reference amount at high temperature of the turbine).
- the reference amount V0 of the valve overlap is set so that the blow-through occurs and the blow-through amount becomes sufficiently large.
- the valve overlap amount v increases to the reference amount V0, low temperature fresh air is discharged to the exhaust path 10 together with the exhaust gas after combustion. Therefore, the low temperature gas can be passed around the exhaust turbine 14 and the temperature around the exhaust turbine 14 can be lowered.
- the control to increase the valve overlap amount v at the high turbine temperature t2 (> T21) to the reference amount V0 is performed only when the inlet temperature t3 of the purification catalyst 20 is lower than the temperature reference value T31. It is. Thereby, deterioration and damage by overheating of the purification catalyst 20 can be suppressed.
- valve overlap amount v is increased when the inlet temperature t3 is high, the purification catalyst 20 is generated by the heat of the gas that has passed through the exhaust turbine 14 and has reached a high temperature and the reaction heat of the unburned fuel. It is expected that the temperature in the upstream will further rise and become higher than the allowable range.
- the ECU 30 does not perform control to increase the valve overlap amount v but performs control to increase the fuel injection amount.
- the fuel injection amount increase is directly injected into the cylinder at the timing after the fuel amount in the normal air-fuel ratio control is injected and burned.
- the temperature of the exhaust gas decreases due to the heat of vaporization of the fuel injected in a large amount.
- the entire purification catalyst 20 is considered to be higher than the allowable range.
- the ECU 30 sets the valve overlap amount as shown at time a3 in the example of FIG. In the increased state, the fuel injection amount is increased to lower the exhaust gas temperature. This lowers the temperature of the entire exhaust system.
- the temperature reference value T21 for the turbine temperature t2 is a temperature that serves as a reference for determining whether to increase the blow-by amount.
- This temperature reference value T21 is a temperature in the vicinity of the upper limit of the heat resistance temperature of the exhaust turbine 14 and its surrounding components, and does not cause a problem of damage to the exhaust turbine 14 immediately at that temperature, but it is preferable to make the temperature low.
- Set to temperature This temperature varies individually depending on the material, shape, and the like of the exhaust turbine 14 and surrounding constituent members, and is appropriately set in advance through experiments or the like and stored in the ECU 30.
- the temperature reference value T31 for the inlet temperature t3 is a temperature that serves as a reference for determining whether or not to increase the valve overlap amount. Since the temperature reference value T31 is a temperature related to the purification catalyst 20, the temperature reference value T31 is lower than the temperature reference value T21 related to the exhaust turbine 14. The temperature reference value T31 is a value near the upper limit of the appropriate activation temperature range of the purification catalyst 20, but even if the temperature further rises due to high temperature exhaust gas inflow or the like, the temperature reference value T31 is appropriate for a certain level. In order to maintain the purification performance, the margin is set. Such a temperature varies depending on the structure and components of the purification catalyst 20, and an appropriate value is set in advance through experiments and stored in the ECU 30.
- the temperature reference value T11 with respect to the outlet temperature t1 is a temperature that serves as a reference for determining whether or not the fuel injection amount is increased as the temperature of the entire exhaust system increases.
- the temperature reference value T11 is a temperature that secures a margin for a future increase in the temperature near the upper limit of the appropriate activation temperature range of the purification catalyst 20.
- the temperature reference value T11 is lower than the temperature reference value T21 and higher than the temperature reference value T31, and is set to an appropriate value through experiments or the like, similar to the temperature reference value T31, and stored in the ECU 30.
- the reference amount V0 is set to a valve overlap amount that is large enough to promote blow-through and ensure a sufficient amount of blow-through.
- the valve timing is variously determined based on other operating conditions, and the valve overlap amount set here is determined as the lower limit value of the valve overlap amount when this control is executed. That is, in the control of the first embodiment, when the valve overlap amount set in another routine is smaller than the reference amount V0 in the current operation state, the valve overlap amount v is increased to the reference amount V0. To do.
- FIG. 3 is a flowchart for illustrating a control routine executed by ECU 30 as a control device in the embodiment of the present invention.
- the routine of FIG. 3 is a routine that is periodically and repeatedly executed.
- the turbine temperature t2 is detected (S102).
- the turbine temperature t2 is detected by the ECU 30 using the output of the temperature sensor 22 installed in the vicinity of the exhaust turbine 14 as input information.
- the inlet temperature t3 is detected (S104).
- the inlet temperature t3 is detected by the ECU 30 using the output of the temperature sensor 24 installed upstream of the purification catalyst 20 as input information.
- the temperature reference value T31 is a temperature serving as a reference for determination stored in the ECU 30 in advance as described above.
- the fuel injection amount is increased (S108).
- the exhaust gas can be lowered in temperature by increasing the fuel injection amount. Thereafter, the current process ends.
- the temperature reference value T21 is a temperature serving as a reference for determination stored in advance in the ECU 30 as described above.
- step S110 If the establishment of the turbine temperature t2> T21 is not recognized in step S110, it is predicted that the vicinity of the exhaust turbine 14 has not reached as high a temperature as the vicinity of the upper limit of the heat-resistant temperature. Therefore, the current control state is maintained, and the current process ends.
- the valve overlap amount v is then increased to the reference amount V0 (S112). Specifically, here, when the valve overlap amount v controlled by another routine is smaller than the reference amount V0, the valve overlap amount v is increased to the reference amount V0. Accordingly, fresh air can be blown through the exhaust passage 10 together with the exhaust gas after combustion, and the temperature around the exhaust turbine 14 can be lowered.
- the outlet temperature t1 is detected (S114).
- the outlet temperature t1 is detected by the ECT 30 using the output of the temperature sensor 26 installed in the downstream portion of the purification catalyst 20 as input information.
- the temperature reference value T11 is a temperature serving as a reference for determination stored in the ECU 30 in advance as described above.
- step S116 if the establishment of the outlet temperature t1> T11 is not recognized, it can be determined that the temperatures of the downstream portion of the purification catalyst 20 and the entire exhaust system are still within the allowable range. In this case, the current process ends with the valve overlap amount v increased to the reference amount V0.
- step S116 if the establishment of the outlet temperature t1> T11 is recognized in step S116, the fuel injection amount is increased (S108).
- the establishment of the outlet temperature t1> T11 it is predicted that the temperature is high up to the downstream side of the exhaust system. Accordingly, the temperature of the exhaust gas is lowered by increasing the fuel injection amount, and the temperature of the entire exhaust system is lowered to a low temperature. Thereafter, the current process ends.
- the fuel injection amount can be increased so that the entire exhaust gas is close to the theoretical air-fuel ratio. In this case, extra fuel is required to obtain the stoichiometric air-fuel ratio.
- the same effect can be obtained with less fuel.
- the “turbine temperature detecting means” of the present invention is realized by executing the process of step S102, and the “inlet temperature detecting means” is realized by executing the process of step S104. Then, the “inlet high temperature determination means” is realized by executing the process of step S106, and the “turbine high temperature determination means” is realized by executing the process of step S110, and the process of step S112 is executed. Thus, an “overlap control means” is realized.
- the “outlet temperature detecting means” of the present invention is realized by executing step S114, and the “fuel increase determining means” is realized by executing step S116. Is executed to realize “fuel injection amount control means”.
- FIG. 4 is a timing chart for illustrating the control contents in the second embodiment of the present invention.
- the timing chart of FIG. 4 is control performed when not only the exhaust turbine 14 but also the entire exhaust system becomes excessively hot.
- the entire purification catalyst 20 The temperature is considered to be high.
- T12 exit high temperature reference value
- the temperature of the purification catalyst 20 further rises due to reaction heat caused by the reaction between the fresh air blown through and unburned fuel, and damage or deterioration of the purification catalyst 20 is predicted.
- the ECU 30 reduces the valve overlap amount v to the reference amount V1 (exit The first opening degree reference value at high temperature). As a result, blow-through is suppressed, so that temperature rise due to the reaction between unburned fuel and fresh air in the exhaust system can be suppressed.
- the WGV 18 is controlled to open more than the opening reference value G0 (first opening reference value) (before time b1 in FIG. 4), most of the exhaust gas passes through the bypass unit 16. Therefore, the amount of exhaust gas flowing into the exhaust turbine 14 is small. That is, the reaction gas flowing into the purification catalyst 20 without passing through the exhaust turbine 14 increases.
- the exhaust gas has a relatively high temperature, the temperature is lowered by rotating the exhaust turbine 14 and heat is radiated by the complicated shape of the exhaust turbine 14. Therefore, the exhaust gas can be cooled to a low temperature by passing a large amount of gas through the exhaust turbine 14. Therefore, when the amount of gas bypassing the exhaust turbine 14 is large, a decrease in the exhaust gas temperature due to passage through the exhaust turbine 14 cannot be expected.
- the valve overlap amount v is a reference that is smaller than the reference amount V1.
- the amount is limited to V2 (second reference amount at the time of high outlet temperature).
- the temperature reference value T12 for the outlet temperature t1 is a temperature that serves as a reference for determining whether or not to limit the valve overlap amount v.
- the temperature reference value T12 is a temperature higher than the temperature reference value T31 for determining the inlet temperature of the purification catalyst 20 according to the first embodiment, is near the upper limit of the activation temperature of the purification catalyst 20, and is damaged in the exhaust system or the purification catalyst 20.
- This is a temperature at which a margin is ensured so as to be lower than a high temperature at which the purification performance may be deteriorated.
- This temperature is individually different depending on the material, shape, and the like constituting the purification catalyst 20, and is appropriately set in advance through experiments or the like and stored in the ECU 30.
- the reference amounts V1 and V2 when the valve overlap amount v is decreased, and the opening reference value G0 with respect to the opening g of the WGV 18 as a reference for the determination are the operating conditions, the heat radiation amount in the exhaust turbine 14, and the temperature decrease amount. It differs depending on the structure of the bypass portion 16 and the like.
- the reference amounts V1 and V2 are set as appropriate by obtaining effective values through experiments or the like so as to reduce the temperature rise of the exhaust system in relation to the opening reference value G0 of the WGV 18, and stored in the ECU 30.
- valve timing is variously determined based on other operating conditions and the like, and the valve overlap reference amounts V1 and V2 set here are the valve overlap amounts when the control of the second embodiment is executed. Is defined as the upper limit value. That is, in the control of the second embodiment, the valve overlap amount v is limited to the reference amount V1 or V2 when the valve overlap amount set in another routine is larger than the reference amount V1 or V2 in the current operating state. Control is performed.
- FIG. 5 is a flowchart for illustrating a control routine executed by ECU 30 in the second embodiment of the present invention.
- the routine of FIG. 5 first, the outlet temperature t1 is detected (S202).
- the current opening degree of the WGV 18 is detected (S204).
- the opening degree of the WGV 18 is obtained according to the output of an opening degree sensor (not shown) installed in the WGV 18.
- the temperature reference value T12 is a value that serves as a determination reference that is set in advance as described above and stored in the ECU 30. If the establishment of the outlet temperature t1> T12 is not recognized in step S206, it can be determined that the temperature is at a level at which there is no risk of exhaust system damage, and thus the current process ends.
- the opening degree reference value G0 is a value serving as a reference for determination stored in the ECU 30 in advance as described above.
- step S208 if it is recognized that the opening degree g> G0 is established, it is considered that the amount of gas flowing through the bypass portion 16 without passing through the exhaust turbine 14 is large. In this case, the temperature of the gas that reaches the purification catalyst 20 is increased, and the generation of reaction heat in the purification catalyst 20 may cause the purification catalyst 20 to be further heated. Accordingly, here, the valve overlap amount is limited to the reference amount V2 ( ⁇ V1) (S210).
- V2 is a value stored in ECU 30 as the smallest limit value in the control of the second embodiment.
- valve overlap amount v By controlling the valve overlap amount v to be small, the blow-through amount can be suppressed, heat generation due to the reaction of the exhaust gas in the vicinity of the purification catalyst 20 can be prevented, and overheating of the purification catalyst 20 can be suppressed.
- step S208 when the opening degree g> G0 is not established in step S208, it is considered that the amount of gas introduced into the exhaust turbine 14 is large. In this case, the reaction of the blown-out gas is promoted in the vicinity of the exhaust turbine 14 and a temperature decrease of the exhaust gas in the exhaust turbine 14 is expected to some extent. Accordingly, the valve overlap amount v here is controlled to the reference amount V1 larger than V2 (S212). Thereby, reaction in the downstream purification catalyst 20 can be suppressed, and overheating of the purification catalyst 20 can be suppressed.
- valve overlap amount v is controlled in consideration of the opening degree of the WGV 18 to suppress the temperature rise. Can do.
- the “outlet temperature detecting means” of the present invention is realized by executing the process of step S202, and the “opening degree detecting means” is realized by executing the process of step S204. Then, the “outlet high temperature discrimination means” is realized by executing the process of step S206, and the “opening degree discrimination means” is realized by executing the process of step S208, and the process of step S210 or S212 is executed. As a result, “overlap control means” is realized.
- FIG. 6 is a timing chart for illustrating the contents of control in the third embodiment of the present invention.
- the control content of FIG. 6 is control performed when the temperature of the purification catalyst 20 becomes low enough that the purification performance may be lowered.
- the inlet temperature of the purification catalyst 20 is a low temperature near the lower limit of the activation temperature range, such as during a warm-up process, a reduction in the purification performance of the purification catalyst 20 is expected.
- the temperature of the entire exhaust system including the exhaust turbine 14 is considered to be low. If the amount of blow-through is increased in such a low temperature environment, it is expected that the temperature in the upstream portion of the purification catalyst 20 will be further lowered and lowered due to the low temperature fresh air blown through.
- the ECU 30 blows away by limiting the valve overlap amount v to the reference amount V3. The amount is reduced, and the temperature of the exhaust gas discharged to the exhaust path 10 is set to a relatively high state.
- the opening degree g of the WGV 18 is large, the amount of gas introduced into the purification catalyst 20 through the bypass portion 16 without passing through the exhaust turbine 14 increases. In such a case, the low-temperature exhaust gas directly flows into the purification catalyst 20 without being heated by the exhaust turbine 14 or the like.
- the ECU 30 sets the valve overlap amount v to a reference amount V4 (which is smaller than the V3).
- the second reference amount at low temperature).
- the ECU 30 limits the valve overlap amount v to a reference amount V4 that is smaller than the reference amount V3 when the turbine temperature t2 is lower than the temperature reference value T23 (turbine low temperature reference value). To do.
- the temperature reference value T33 for the inlet temperature t3 is a temperature reference value for determining whether or not the temperature of the purification catalyst 20 is so low that the purification performance may be deteriorated.
- the temperature reference value T33 is a value in the vicinity of the lower limit of the activation temperature range of the purification catalyst 20, but is a temperature within an allowable range set high by securing a slight margin in comparison with the low temperature range where the purification performance may be deteriorated. Yes, such a temperature is determined in advance by experiments or the like and stored in the ECU 30.
- the temperature reference value T23 with respect to the turbine temperature t2 is a temperature reference value serving as a reference for determining whether the restriction amount of the valve overlap amount v is the reference amount V3 or V4.
- temperature reference value T23 is set to a temperature sufficiently lower than temperature reference value T21 in the first embodiment.
- the temperature reference value T23 is a value near a boundary value indicating whether or not the temperature is such that the gas can be heated to some extent by passing through the exhaust turbine 14 even if a low temperature gas is introduced due to an increased amount of blow-through. .
- the temperature reference value T23 varies depending on various factors such as the performance of the purification catalyst 20, the opening reference value G1 of the WGV 18, the reference amounts V3 and V4, the configuration of the exhaust turbine 14, etc., and is appropriately set in advance through experiments or the like. It is stored in the ECU 30.
- the reference amounts V3 and V4 and the reference value G1 for the opening g of the WGV 18 that is the basis for the determination differ depending on the operating conditions, the amount of heat radiation in the exhaust turbine 14, the amount of temperature decrease, the structure of the bypass unit 16, and the like. It becomes.
- the reference amounts V3 and V4 are set as appropriate by obtaining effective values by experiments or the like so as to suppress the temperature drop of the exhaust system in relation to the opening degree G1 of the WGV 18, and stored in the ECU 30.
- FIG. 7 is a flowchart for illustrating a control routine executed by the system in the third embodiment of the present invention.
- the routine of FIG. 7 first, the turbine temperature t2 and the inlet temperature t3 are detected (S302, S304). Next, the opening degree g of the WGV 18 is detected (S306).
- the temperature reference value T33 is a value serving as a reference for determination stored in the ECU 30 in advance.
- step S308 it is next determined whether or not the turbine temperature t2 is lower than the temperature reference value T23 (S310).
- the temperature reference value T23 is a value serving as a reference for determination stored in the ECU 30 in advance.
- step S310 if the establishment of the turbine temperature t2 ⁇ T23 is not recognized, it is then determined whether or not the opening g of the WGV 18 is smaller than the opening reference value G1 (S312).
- the opening reference value G1 is a value serving as a reference for determination stored in the ECU 30 in advance.
- step S310 If the establishment of the turbine temperature t2 ⁇ T23 is recognized in step S310, or if the establishment of the opening degree g ⁇ G1 of the WGV 18 is not recognized in step S312, the exhaust turbine 14 is at a low temperature, so that Even if the exhaust gas temperature cannot be expected to rise sufficiently, or even if the exhaust turbine 14 is equal to or higher than the temperature reference value T23, the exhaust turbine 14 flows into the purification catalyst 20 at a low temperature because of a large amount of bypass. Judged to be in danger. Therefore, in these cases, the valve overlap amount v is limited to the smallest reference amount V4 in this control (S314). Thereafter, the current process ends.
- the exhaust gas passes through the exhaust turbine 14 having a relatively high temperature. By passing without bypassing, the temperature rises to some extent. Accordingly, in this case, the valve overlap amount is limited to the reference amount V3 (> V4) (S316).
- the temperature decrease of the purification catalyst 20 is suppressed and the purification performance of the purification catalyst 20 is maintained by controlling the valve overlap amount. can do.
- the “turbine temperature detecting means” of the present invention is realized by executing the process of step S302, and the “inlet temperature detecting means” is realized by executing the process of step S304. Then, the “opening degree detecting means” of the present invention is realized by executing the process of step S306, and the “inlet low temperature determining means” is realized by executing the process of step S308, and the process of step S310. Is executed, the “turbine low temperature determination means” is realized, the step S312 is executed, the “second opening degree determination means” is realized, and the step S314 or S316 is executed. "Overlap control means" is realized.
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Abstract
Description
内燃機関の排気経路に設置された浄化触媒の入口近傍の温度である入口温度を検出する入口温度検出手段と、
前記浄化触媒の入口近傍より上流側の温度であって、かつ前記排気経路に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記入口温度が、入口高温度基準値より低いか否かを判別する入口高温判別手段と、
前記タービン温度が、前記入口高温度基準値よりも高いタービン高温度基準値より高いか否かを判別するタービン高温判別手段と、を備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口高温度基準値より低いと判別され、かつ前記タービン温度がタービン高温度基準値より高いと判別された場合、バルブオーバーラップ量を、タービン高温時基準量より大きくなるように増加させる。
前記浄化触媒の入口近傍より下流側の、前記浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記出口温度が、前記入口高温度基準値よりも高く前記タービン高温度基準値よりも低い、燃料増加温度基準値より高いか否かを判別する燃料増加判別手段と、
前記出口温度が前記燃料増加温度基準値より高いと判別された場合に、前記内燃機関に供給される燃料噴射量を増加させる燃料噴射量制御手段と、
を更に備える。
前記浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記出口温度が、出口高温度基準値より高いか否かを判別する出口高温判別手段と、
前記開度が第1開度基準値より大きいか否かを判別する開度判別手段と、を更に備え、
前記オーバーラップ制御手段は、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ前記開度が前記第1開度基準値より大きいことが認められないと判別された場合に、バルブオーバーラップ量を、出口高温時第1基準量より小さく制限し、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ、前記開度が前記第1開度基準値より大きいと判別された場合に、前記バルブオーバーラップ量を、前記出口高温時第1基準量よりも小さい出口高温時第2基準量より小さく制限する。
前記排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記入口温度が、前記入口高温度基準値よりも低い入口低温度基準値より低いか否かを判別する入口低温判別手段と、
前記タービン温度が、前記タービン高温度基準値よりも低いタービン低温度基準値より低いか否かを判別するタービン低温判別手段と、
前記開度が第2開度基準値より小さいか否かを判別する第2開度判別手段と、を更に備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いことが認められないと判別され、かつ、前記開度が前記第2開度基準値より小さいと判別された場合に、前記バルブオーバーラップ量を、低温時第1基準量より小さく制限し、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いと判別された場合、又は、前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記開度が前記第2開度基準値より小さいことが認められないと判別された場合に、前記バルブオーバーラップ量を、前記低温時第1基準量よりも小さい低温時第2基準量より小さく制限する。
内燃機関の排気経路に設置された浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記排気経路の前記浄化触媒より上流に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記ターボ過給機の排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記出口温度が、出口高温度基準値より高いか否かを判別する出口高温判別手段と、
前記開度が第1開度基準値より大きいか否かを判別する開度判別手段と、を備え、
前記オーバーラップ制御手段は、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ前記開度が前記第1開度基準値より大きいことが認められないと判別された場合に、バルブオーバーラップ量を、出口高温時第1基準量より小さく制限し、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ、前記開度が、前記第1開度基準値より大きいと判別された場合に、前記バルブオーバーラップ量を、前記出口高温時第1基準量よりも小さい出口高温時第2基準量より小さく制限する。
内燃機関の排気経路に設置された浄化触媒の入口近傍の温度である入口温度を検出する入口温度検出手段と、
前記入口近傍より上流側の温度であって、かつ前記排気経路に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記排気経路に設置されたターボ過給機の排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記入口温度が、入口低温度基準値より低いか否かを判別する入口低温判別手段と、
前記タービン温度が、タービン低温度基準値より低いか否かを判別するタービン低温判別手段と、
前記開度が第2開度基準値より小さいか否かを判別する第2開度判別手段と、を備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いことが認められないと判別され、かつ、前記開度が前記第2開度基準値より小さいと判別された場合に、前記バルブオーバーラップ量を、低温時第1基準量より小さく制限し、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いと判別された場合、又は、前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記開度が前記第2開度基準値より小さいことが認められないと判別された場合に、前記バルブオーバーラップ量を、前記低温時第1基準量よりも小さい低温時第2基準量より小さく制限する。
図1は、この発明の実施の形態1における内燃機関の制御装置及びその周辺機器を含むシステムの全体構成について説明するための模式図である。図1のシステムは内燃機関2を備えている。内燃機関2は♯1~♯4の4つの気筒を有する。内燃機関2には各気筒内に燃料を直接噴射することができる筒内噴射用の燃料噴射弁が設置されている。
実施の形態2のシステムは、実施の形態1のシステムと同様の構成を有している。図4は、この発明の実施の形態2における制御内容を説明するためのタイミングチャートである。図4のタイミングチャートは、排気タービン14だけでなく排気系全体が過度に高温となった場合に行なわれる制御である。
図6は、この発明の実施の形態3における制御内容を説明するためのタイミングチャートである。図6の制御内容は、浄化触媒20の温度がその浄化性能低下の恐れがあるほどに低温になった場合に実施される制御である。
4 VVT
10 排気経路
12 ターボ過給機
14 排気タービン
16 バイパス部
18 WGV
20 浄化触媒
22、24、26 温度センサ
Claims (6)
- 内燃機関の排気経路に設置された浄化触媒の入口近傍の温度である入口温度を検出する入口温度検出手段と、
前記浄化触媒の入口近傍より上流側の温度であって、かつ前記排気経路に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記入口温度が、入口高温度基準値より低いか否かを判別する入口高温判別手段と、
前記タービン温度が、前記入口高温度基準値よりも高いタービン高温度基準値より高いか否かを判別するタービン高温判別手段と、を備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口高温度基準値より低いと判別され、かつ前記タービン温度がタービン高温度基準値より高いと判別された場合、バルブオーバーラップ量を、タービン高温時基準量より大きくなるように増加させることを特徴とする内燃機関の制御装置。 - 前記浄化触媒の入口近傍より下流側の、前記浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記出口温度が、前記入口高温度基準値よりも高く前記タービン高温度基準値よりも低い、燃料増加温度基準値より高いか否かを判別する燃料増加判別手段と、
前記出口温度が前記燃料増加温度基準値より高いと判別された場合に、前記内燃機関に供給される燃料噴射量を増加させる燃料噴射量制御手段と、
を更に備える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。 - 前記浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記出口温度が、出口高温度基準値より高いか否かを判別する出口高温判別手段と、
前記開度が第1開度基準値より大きいか否かを判別する開度判別手段と、を更に備え、
前記オーバーラップ制御手段は、
前記出口温度が前記出口高温度基準値より高いと判別され、前記開度が前記第1開度基準値より大きいことが認められないと判別された場合に、バルブオーバーラップ量を、出口高温時第1基準量より小さく制限し、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ、前記開度が前記第1開度基準値より大きいと判別された場合に、前記バルブオーバーラップ量を、前記出口高温時第1基準量よりも小さい出口高温時第2基準量より小さく制限することを特徴とする請求項1又は2に記載の内燃機関の制御装置。 - 前記排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記入口温度が、前記入口高温度基準値よりも低い入口低温度基準値より低いか否かを判別する入口低温判別手段と、
前記タービン温度が、前記タービン高温度基準値よりも低いタービン低温度基準値より低いか否かを判別するタービン低温判別手段と、
前記開度が第2開度基準値より小さいか否かを判別する第2開度判別手段と、を更に備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いことが認めらないと判別され、かつ、前記開度が前記第2開度基準値より小さいと判別された場合に、前記バルブオーバーラップ量を、低温時第1基準量より小さく制限し、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いと判別された場合、又は、前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記開度が前記第2開度基準値より小さいことが認められないと判別された場合に、前記バルブオーバーラップ量を、前記低温時第1基準量よりも小さい低温時第2基準量より小さく制限することを特徴とする請求項1から3のいずれか1項記載の内燃機関の制御装置。 - 内燃機関の排気経路に設置された浄化触媒の出口近傍の温度である出口温度を検出する出口温度検出手段と、
前記排気経路の前記浄化触媒より上流に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記ターボ過給機の排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記出口温度が、出口高温度基準値より高いか否かを判別する出口高温判別手段と、
前記開度が第1開度基準値より大きいか否かを判別する開度判別手段と、を備え、
前記オーバーラップ制御手段は、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ、前記開度が前記第1開度基準値より大きいことが認められないと判別された場合に、バルブオーバーラップ量を、出口高温時第1基準量より小さく制限し、
前記出口温度が前記出口高温度基準値より高いと判別され、かつ、前記開度が、前記第1開度基準値より大きいと判別された場合に、前記バルブオーバーラップ量を、前記出口高温時第1基準量よりも小さい出口高温時第2基準量より小さく制限することを特徴とする内燃機関の制御装置。 - 内燃機関の排気経路に設置された浄化触媒の入口近傍の温度である入口温度を検出する入口温度検出手段と、
前記入口近傍より上流側の温度であって、かつ前記排気経路に設置されたターボ過給機の排気タービン近傍の温度であるタービン温度を検出するタービン温度検出手段と、
前記排気経路に設置されたターボ過給機の排気タービンをバイパスするバイパス経路を開閉するウェイストゲートバルブの開度を検出する開度検出手段と、
前記内燃機関の吸気バルブと排気バルブとが同時に開いた状態であるバルブオーバーラップを制御するオーバーラップ制御手段と、
前記入口温度が、入口低温度基準値より低いか否かを判別する入口低温判別手段と、
前記タービン温度が、タービン低温度基準値より低いか否かを判別するタービン低温判別手段と、
前記開度が第2開度基準値より小さいか否かを判別する第2開度判別手段と、を備え、
前記オーバーラップ制御手段は、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いことが認められないと判別され、かつ、前記開度が前記第2開度基準値より小さいと判別された場合に、前記バルブオーバーラップ量を、低温時第1基準量より小さく制限し、
前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記タービン温度が前記タービン低温度基準値より低いと判別された場合、又は、前記入口温度が前記入口低温度基準値より低いと判別され、かつ、前記開度が前記第2開度基準値より小さいことが認められないと判別された場合に、前記バルブオーバーラップ量を、前記低温時第1基準量よりも小さい低温時第2基準量より小さく制限することを特徴とする内燃機関の制御装置。
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EP10790337.9A EP2562398B1 (en) | 2010-04-20 | 2010-04-20 | Control device for an internal combustion engine |
CN201080001685.1A CN102439276B (zh) | 2010-04-20 | 2010-04-20 | 内燃机的控制装置 |
US12/999,851 US8973563B2 (en) | 2010-04-20 | 2010-04-20 | Internal combustion engine control apparatus |
PCT/JP2010/057004 WO2011132264A1 (ja) | 2010-04-20 | 2010-04-20 | 内燃機関の制御装置 |
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US20120279216A1 (en) * | 2010-12-20 | 2012-11-08 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for internal combustion engine with supercharger |
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CN107735559A (zh) * | 2015-03-13 | 2018-02-23 | 通用汽车环球科技运作有限责任公司 | 用于控制内燃机的方法和设备 |
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US20110253116A1 (en) | 2011-10-20 |
EP2562398B1 (en) | 2015-08-12 |
EP2562398A8 (en) | 2013-08-28 |
CN102439276B (zh) | 2014-06-04 |
EP2562398A1 (en) | 2013-02-27 |
US8973563B2 (en) | 2015-03-10 |
EP2562398A4 (en) | 2014-05-07 |
CN102439276A (zh) | 2012-05-02 |
JP4968387B2 (ja) | 2012-07-04 |
JPWO2011132264A1 (ja) | 2013-07-18 |
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