WO2011093141A1 - エンジンの吸気系に用いられる制御弁の制御装置及び制御方法 - Google Patents
エンジンの吸気系に用いられる制御弁の制御装置及び制御方法 Download PDFInfo
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- WO2011093141A1 WO2011093141A1 PCT/JP2011/050473 JP2011050473W WO2011093141A1 WO 2011093141 A1 WO2011093141 A1 WO 2011093141A1 JP 2011050473 W JP2011050473 W JP 2011050473W WO 2011093141 A1 WO2011093141 A1 WO 2011093141A1
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- control valve
- target opening
- intake system
- engine
- opening
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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]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
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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
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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
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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
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
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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
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
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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
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
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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
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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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- 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 is provided in an intake system of an engine, and includes an intake throttle valve for controlling an intake air amount to the engine or an EGR valve for controlling an EGR amount, and a control valve used for the intake system, and an operating state of the engine And a control means for determining a target opening of a control valve used in the intake system according to the control and adjusting the opening of the control valve used in the intake system so as to coincide with the target opening.
- the present invention relates to a control device and a control method for a control valve used in an intake system.
- An exhaust gas recirculation (hereinafter referred to as EGR) device is known as a technique for reducing nitrogen oxide (NOx) in exhaust gas of an internal combustion engine.
- the EGR device recirculates EGR gas obtained by extracting a part of exhaust gas from the exhaust passage of the internal combustion engine to the intake passage through the EGR passage. That is, when EGR is used, new intake air and a part of the exhaust gas, that is, EGR gas is mixed and introduced into the combustion chamber of the engine.
- an EGR control valve for controlling the flow rate of the EGR gas is provided in the EGR passage, and the amount of EGR gas recirculated to the intake passage is controlled by controlling the opening degree of the EGR control valve.
- the EGR control valve fails, the amount of EGR gas that recirculates to the intake passage cannot be controlled, and there is a possibility that the amount of EGR gas that recirculates to the intake passage is excessive or insufficient, or that the EGR gas stops. is there.
- Patent Document 1 discloses an actual opening that changes following a change in the target opening after the target opening starts changing when an EGR operation condition in which the target opening of the EGR control valve changes by a predetermined amount or more is established. Is detected by the actual opening detection means, and when it is confirmed that the detected actual opening does not change following the target opening, a technique for determining that the device including the EGR control valve has failed is disclosed. Has been.
- an EGR control valve 102 provided with a valve shaft 102b and a reciprocating drive shaft 112 arranged on the extension of the valve shaft 102b reciprocate in the axial direction.
- the reciprocating drive shaft 112 of the drive means opens the EGR control valve 102 by pressing the front end of the central axis of the EGR control valve 102 when the drive means is operated.
- the control means determines that a failure has occurred in the EGR control valve 102 depending on the duty ratio of a control signal oscillated by the control means with respect to the drive means 106. It is disclosed.
- the sticking of the control valve due to running out of lubricating oil due to being held is not limited to the EGR control valve, but also in the intake system of other engines such as a throttle valve provided in the intake passage for intake to the engine from the outside The same is true for the control valve used.
- the present invention is directed to the intake system even under operating conditions in which the target opening of the control valve used in the intake system of the engine matches the actual opening and the target opening does not change. It is possible to detect a failure of the control valve used in the engine, and the motor bearing is caused by running out of lubricating oil caused by holding the control valve used in the intake system at the same opening for a long time.
- An object of the present invention is to provide a control device and a control method for a control valve used in an intake system of an engine, which can prevent the control valve used in the intake system from sticking due to damage.
- an intake throttle valve for controlling the intake air amount to the engine or an EGR valve for controlling the EGR amount, which is provided in the intake system of the engine, and used for the intake system
- the target opening of the control valve used for the intake system is determined according to the valve and the operating state of the engine, and the opening of the control valve used for the intake system is adjusted so as to match the target opening
- a control valve used in an intake system of an engine comprising a control means, wherein the control means determines the target opening when the target opening remains the same for a predetermined time or more. It is configured to prevent and detect a failure of a control valve used in the intake system by changing over time from a target opening determined in accordance with the operating state of the engine.
- the opening of the control valve used in the intake system is not maintained at the same opening for a long time. Therefore, sticking of the control valve used in the intake system due to damage to the motor bearing caused by holding the opening of the control valve used in the intake system at the same opening for a long time can be avoided. Further, since the target opening is changed with time, there is no problem that a failure cannot be detected under an operating condition in which the target opening does not change as in the prior art. A failure of the control valve used in the intake system can be detected by confirming the tracking of the actual opening of the control valve used.
- control means changes the target opening over time within a dead zone region where there is no influence on the intake air amount or EGR amount even if the opening of a control valve used in the intake system changes. It is good to be configured.
- EGR gas flow rate, EGR mixing rate during intake (EGR rate), intake flow rate, excess oxygen rate, air There is a dead zone where the excess rate hardly changes.
- the dead zone region varies depending on the size and structure of the valve, and the range is unique to the valve. However, the range of about 60 to 100% of the opening is the dead zone region in many cases.
- the present invention can be implemented with little influence on the operating state of the engine.
- control means when the control means changes the target opening over time, a time during which a difference between the target opening and an actual opening of a control valve used in the intake system is equal to or greater than a predetermined allowable value.
- it may be configured to determine that the control valve used in the intake system has failed when the operation continues for a predetermined allowable time or longer. Thereby, it is possible to reliably determine the failure of the control valve used in the intake system.
- a difference between the target opening and an actual opening of a control valve used in the intake system becomes equal to or greater than a predetermined allowable value.
- the target opening may be held without changing.
- the reason why the difference between the target opening and the actual opening of the control valve used in the intake system is greater than or equal to a predetermined allowable value is that the opening of the control valve used in the intake system does not change. It is possible to specify whether the cause is the slow follow-up of the change in the opening degree to the command value.
- control means forcibly sets the target opening to the dead zone when the target opening is not kept the same for a certain period of time and the target opening is within the dead zone. It is better to keep it constant within the range. As a result, it is possible to avoid frequent operation of the control valve used in the intake system in the dead zone when it is not necessary to change the target opening over time. Thereby, the valve shaft of the control valve used in the intake system operates more than necessary, and troubles such as wear of the seal of the valve shaft portion and leakage of exhaust gas from the seal portion can be avoided.
- control means holds a function representing a relationship between a parameter ⁇ determined according to an operating state of the engine and the target opening, and determines the target opening based on the parameter ⁇ , It is preferable to give hysteresis to the function.
- a control valve used in an intake system which is a throttle valve for controlling an intake air amount to the engine or an EGR valve for controlling an EGR amount according to an operating state of the engine
- the target opening is A failure of a control valve used in the intake system by changing the target opening over time from a target opening determined in accordance with the operating state of the engine when the same opening is maintained for a certain period of time. It is characterized by prevention and failure detection.
- the target opening is changed with time within a dead zone where there is no influence on the intake air amount or the EGR amount even if the opening of a control valve used in the intake system changes.
- the time during which the difference between the target opening and the actual opening of the control valve used in the intake system is equal to or greater than a predetermined allowable value is a predetermined allowable value. If it continues for more than a certain time, it may be determined that the control valve used in the intake system has failed.
- the target opening is changed over time, if the difference between the target opening and the actual opening of the control valve used in the intake system is equal to or greater than a predetermined allowable value, It is good to hold without changing the target opening.
- the target opening when the target opening is not kept the same for the predetermined time or more and the target opening is within the dead zone, the target opening is forcibly fixed within the dead zone. It is good to fix to.
- the control valve used for the intake system fails.
- the motor bearing is damaged and used for the intake system due to running out of lubricating oil caused by holding the control valve used for the intake system at the same opening for a long time. It is possible to prevent sticking of the control valve.
- 3 is a flowchart illustrating a control procedure regarding a change in a target opening degree of an EGR control valve according to the first embodiment. It is a flowchart which shows the procedure of a dead zone determination process. It is a flowchart which shows the procedure of the process of judgment of abnormality of the EGR control valve in EGR valve sticking prevention mode. It is a flowchart which shows another example which shows the procedure of the process of judgment of abnormality of the EGR control valve in EGR valve sticking prevention mode.
- FIG. 6 is a flowchart illustrating a control procedure related to a change in a target opening degree of an EGR control valve according to a second embodiment. It is the flowchart which showed the procedure of hysteresis operation determination. It is a flowchart which shows the procedure of the process in hysteresis operation mode. It is sectional drawing of the EGR control valve periphery in a prior art example.
- FIG. 1 is a schematic diagram illustrating an EGR device to which the control device for an EGR control valve according to the first embodiment is applied.
- the engine 2 is a four-cycle diesel engine having four cylinders.
- An intake passage 8 is joined to the engine 2 via an intake manifold 6 and an exhaust passage 12 is connected via an exhaust manifold 10.
- the intake passage 8 is provided with a compressor 14 a of the turbocharger 14.
- the compressor 14a is coaxially driven by a turbine 14b described later.
- An intercooler 16 for exchanging heat between the intake air flowing through the intake passage 8 and the atmosphere is provided downstream of the compressor 14a in the intake passage 8.
- a throttle valve 18 that adjusts the flow rate of intake air flowing through the intake passage 8 is provided downstream of the intercooler 16 in the intake passage 8.
- a turbine 14b of the turbocharger 14 is provided in the exhaust passage 12.
- the turbine 14 b is driven by exhaust gas from the engine 2.
- the exhaust manifold 10 is connected to an EGR passage 20 that recirculates a part of the exhaust to the intake side.
- the EGR passage 20 is provided with an EGR cooler 22 and an EGR control valve 24.
- the EGR cooler 22 is provided closer to the exhaust manifold 10 than the EGR control valve 24.
- the EGR cooler 22 exchanges heat between the EGR gas passing through the EGR cooler 22 and the cooling water to lower the temperature of the EGR gas.
- the EGR control valve 24 controls the flow rate of EGR gas flowing through the EGR passage 20.
- the opening degree of the EGR control valve 24 and the throttle valve 18 is controlled by an engine control unit (ECU) 40.
- ECU 40 engine control unit
- actual opening amounts of the EGR control valve 24 and the throttle valve 18 are inputted, and an intake air temperature sensor 28 and an intake pressure sensor 30 attached to the intake passage 8 or the intake manifold 6 on the downstream side of the throttle valve 18.
- the detected values are input via A / D converters 43 and 44, respectively.
- the detected value of the intake flow rate detected by the air flow meter 26 attached to the intake passage 8 on the upstream side of the compressor 14 a is input via the A / D converter 42.
- the detection value of the engine speed sensor 32 is input via the pulse count circuit 47.
- the CPU 48 calculates the target opening degree of the EGR control valve 24 and the throttle valve 18 based on the respective input values described above, and the opening degree of the EGR control valve 24 and the throttle valve 18 via the drive circuits 45 and 46. To control. Further, the CPU 48 calculates the fuel injection amount to the engine 4 based on the respective input values described above, and controls the fuel injection amount to the engine 4 via the injector drive circuit 41.
- FIG. 2 shows an example of control logic performed by the ECU 40.
- the engine speed [rpm] and the fuel injection amount [mg / st] to the engine 2 are input to the ECU 40 in the target ⁇ map 51 and the target ⁇ O 2 map 52, and the target ⁇ and the target ⁇ O are based on the input values. 2 is created.
- ⁇ is a value determined by the opening degrees of the EGR control valve 24 and the throttle valve 18, and will be described in detail later.
- ⁇ O 2 is the oxygen excess rate.
- ⁇ O 2 is estimated from the air flow rate [kg / s], the intake manifold pressure (intake manifold pressure) [kPa], the intake manifold temperature [° C.], the engine speed [rpm], the fuel injection amount [mg / st], and the like.
- a value calculation 53 is performed.
- an error between the target ⁇ O 2 and the calculated value of the estimated value of ⁇ O 2 is calculated by the subtraction processing 54, and PID control 55 is performed based on the error.
- the parameter ⁇ is determined by the PID control 55, addition processing between the ⁇ and the target ⁇ is performed, and a saturation calculation 57 is performed, so that ⁇ is corrected.
- the function 58 for determining the opening degree of the EGR control valve 24 from the parameter ⁇ and the function 59 for determining the opening degree of the throttle valve 18 from the parameter ⁇ , the EGR control valve 24 and the slot valve 18 Determine the opening command value.
- the functions 58 and 59 are stored in the ECU 40 in advance.
- the EGR control valve 24 and the throttle valve 18 have a fully open position and a fully closed position, that is, there is saturation. For this reason, when the EGR control valve 24 or the throttle valve 18 is fully opened or fully closed, the control deviation remains.
- the error used for the PID control 55 is maintained in a non-zero state, the integral value in the PID control 55 continues to increase, resulting in a windup problem in which the control responsiveness deteriorates.
- the difference between the parameter ⁇ obtained by the PID control and the parameter ⁇ corrected by the saturation calculation 39 is calculated by the subtraction process 60, and antiwindup compensation is performed based on the difference. ing.
- EGR control valve 24 and the throttle valve 18 have almost the same EGR gas flow rate, EGR mixing rate (EGR rate) during intake, intake flow rate, excess oxygen rate, excess air rate, etc. There is a region that does not change (hereinafter referred to as a dead zone region).
- FIG. 3 is a graph showing an example of the characteristics of the EGR control valve 24, and FIG. 4 is a graph showing an example of the characteristics of the throttle valve 18.
- the vertical axis represents the oxygen excess rate ⁇ O 2
- the horizontal axis represents the opening degree [%] of the EGR control valve 24.
- the vertical axis represents the oxygen excess ratio ⁇ O 2
- the horizontal axis represents the opening degree [%] of the throttle valve 18.
- the dead zone region is a region where the opening degree of the EGR control valve 24 is about 60 to 100%.
- EGR gas flow rate EGR mixing rate (EGR rate) during intake, intake flow rate, excess air rate, etc.
- EGR rate EGR mixing rate
- the area where the opening degree of the throttle valve 18 is about 70 to 100%, particularly 80 to 100% is the dead zone.
- FIG. 5 shows an example of a function for determining the opening degree of the EGR control valve 24 from the parameter ⁇ and a function for determining the opening degree of the throttle valve 18 from the parameter ⁇ .
- the functions 58 and 58 shown in FIG. This corresponds to 59.
- the vertical axis represents the target value (command value) of the opening degree of the EGR control valve
- the horizontal axis represents ⁇ .
- the vertical axis represents the target value (command value) of the throttle valve opening
- the horizontal axis represents ⁇ .
- ⁇ is a value determined by the opening degree of the EGR control valve and the opening degree of the throttle valve.
- region indicated by a in the upper diagram of FIG. 5 indicates the dead zone region of the EGR control valve
- region indicated by b indicates the region sensitive to the opening degree of the EGR control valve
- a region indicated by a ′ indicates a dead zone region of the throttle valve
- a region indicated by b ′ indicates a region sensitive to the opening of the throttle valve.
- the target opening degree of the EGR control valve 24 is 100%, and the opening degree of the EGR control valve 24 is the same opening degree (100%) for a long time.
- the motor bearing lubricating oil (oil curtain) runs out as shown by 101 in FIG. 18, and the motor bearing is damaged due to the running out of lubricating oil, and there is a risk of malfunction or sticking to the EGR control valve. It sometimes occurred.
- the target opening does not change, so even if the EGR control valve fails, the target opening and the actual opening coincide with each other at the time of failure. It was not detected.
- the opening degree of the EGR control valve in the dead zone region where the opening degree of the EGR control valve is about 60 to 100%, attention is paid to the fact that the excess oxygen ratio ⁇ O 2 and the like hardly change even if the opening degree of the EGR control valve is changed.
- the target value of the opening degree of the EGR control valve is kept the same for a certain time or longer, the target value is changed in the dead zone region as indicated by c in the upper diagram of FIG.
- the target opening degree of the EGR control valve 24 changes, so that the EGR control valve sticking due to the damage of the motor bearing caused by holding the opening degree of the EGR control valve at the same opening degree for a long time is avoided. And a failure of the EGR control valve can be detected.
- Such a change in the dead zone region of the target opening of the EGR control valve can be performed if the target valve opening is ⁇ in the dead zone region, and can be implemented when ⁇ ⁇ 1 in FIG. .
- FIG. 6 is a graph showing the change over time of the target opening of the EGR control valve when the target opening of the EGR control valve is changed in the dead zone region.
- the vertical axis represents the target opening of the EGR control valve
- the horizontal axis represents time.
- the target opening of the EGR control valve is changed to a wave shape.
- the target opening degree of the EGR control valve is changed so that the graph of the time change of the target opening degree of the EGR control valve has a wave shape. If the degree changes with time, the graph can be changed to be rectangular, for example.
- FIG. 7 is a graph showing the change over time of the target opening of the throttle valve when the target opening of the EGR control valve is changed in the dead zone region.
- the vertical axis represents the target opening of the throttle valve
- the horizontal axis represents time. At this time, the target opening of the throttle valve does not change.
- FIG. 8 is a flowchart showing a control procedure related to a change in the target opening degree of the EGR control valve.
- the cooling water means engine cooling water
- T1 is a specified temperature. If NO in step S101, that is, if the cooling water temperature is equal to or lower than T1, the process proceeds to step S108, stops the EGR without performing the EGR operation, and ends the process. If YES in step S101, that is, if the coolant temperature is higher than T1, the process proceeds to step S102.
- step S102 dead zone determination is performed.
- the dead zone determination is performed according to the flowchart shown in FIG. The dead zone determination will be described with reference to FIG.
- step S201 it is determined in step S201 whether ⁇ is smaller than ⁇ 1.
- ⁇ is a value commanded by the logic shown in FIG. 2
- ⁇ 1 is a boundary value of ⁇ in which the target valve opening is in the dead zone region, and corresponds to ⁇ 1 shown in FIG. If YES in step S201, that is, if ⁇ ⁇ 1, the process proceeds to step S202, the dead zone determination flag is turned on, and the process ends. If NO in step S201, that is, if ⁇ ⁇ ⁇ 1, the process proceeds to step S203, where the dead zone determination flag is turned off and the process ends.
- step S102 in the flowchart shown in FIG. 8 when the dead zone determination is completed according to the flowchart shown in FIG. 9, the process proceeds to step S103.
- step S103 it is determined whether or not the dead zone determination flag is ON. If NO in step S3, that is, if the dead zone determination flag is OFF, the process proceeds to step S107 and is commanded by the function 58 without forcibly changing the normal control mode of the EGR control valve, that is, the target opening of the EGR control valve as in the conventional case.
- the opening degree of the EGR control valve is controlled according to the opening degree command of the EGR control valve.
- step S104 it is determined whether it is a sticking prevention operation timing. As described above, when the opening degree of the EGR control valve is maintained at the same opening degree for a long time, the lubricating oil runs out, the motor bearing is damaged, and the EGR control valve is fixed. Therefore, when the target value of the opening degree of the EGR control valve is not constant for a long time, the sticking or the like does not occur. Therefore, in step S104, it is determined whether or not the target value of the opening degree of the EGR control valve is constant over a certain period of time when it is necessary to perform the sticking prevention operation.
- the predetermined time is determined individually for each EGR control valve according to the performance of the EGR control valve to be used, equipment around the engine, and the like.
- step S104 determines NO in step S104, that is, it is not the sticking prevention operation timing
- step S107 the EGR control valve normal control mode, that is, the EGR control valve target opening is not forcibly changed as in the prior art. Controls the opening of the control valve.
- step S106 the opening of the EGR control valve is controlled in the EGR valve sticking prevention mode, and the process is terminated.
- the target value of the opening degree of the EGR control valve is changed within the range of the dead zone.
- an abnormality of the EGR control valve can be determined from the target value and the actual opening of the EGR control valve. Determination of abnormality of the EGR control valve in the EGR valve sticking prevention mode will be described using the flowchart shown in FIG.
- FIG. 10 is a flowchart showing a procedure of processing for determining abnormality of the EGR control valve in the EGR valve sticking prevention mode.
- the process proceeds to step S301.
- step S301 a command value for the opening degree of the EGR control valve is calculated. This can be obtained by calculating ⁇ in accordance with the logic procedure shown in FIG.
- step S301 ends, the process proceeds to step S302.
- step S302 an EGR control valve opening command is output.
- step S302 ends, the process proceeds to step S303.
- step S303 an EGR valve opening deviation e is calculated. This means the difference between the command value of the EGR valve opening and the actually measured value.
- step S304 it is determined whether the absolute value
- the allowable value means an upper limit value of
- the allowable value is a value determined individually for each EGR control valve depending on the performance of the EGR control valve, equipment around the engine, and the like.
- step S304 If NO in step S304, that is, if
- t e the duration of the state in which
- t s the calculation cycle.
- the calculation cycle t s is meant a period processing from the start of the flowchart in FIG. 10 to the end is executed.
- (1) is the current duration duration t e shown in the left-hand side in the equation
- the duration time t e shown in the right-hand side refers to the duration of one period before.
- step S305 ends, the process proceeds to step S306.
- t e calculated in step S305 it is determined whether longer or not than the allowed time.
- the allowable time is,
- the allowable time is a value determined individually for each EGR control valve depending on the performance of the EGR control valve, equipment around the engine, and the like.
- step S306 determines that the "EGR valve operation abnormality", and the process is terminated stopping the EGR control in Step S308.
- FIG. 11 is a flowchart showing another example of a procedure for determining an abnormality of the EGR control valve in the EGR valve sticking prevention mode.
- steps S401 to S405 are the same as steps S301 to S305 in the flowchart shown in FIG.
- steps S407 to S410 are the same as steps S306 to S309 in the flowchart shown in FIG. Therefore, in FIG. 11, description is abbreviate
- step S404 when> is determined that the allowable value, after calculating the t e at step S405, and holds the EGR valve opening command at step S406.
- the command value of the EGR valve opening is held at a constant value.
- > allowable value that is, the reason why the absolute value of the difference between the command value of the EGR valve opening and the actually measured value exceeds the allowable value. It is possible to specify whether the cause is that the opening degree of the EGR control valve does not change or that the follow-up of the change in opening degree to the command value is slow.
- the case where the EGR control valve is almost fully open and the target value of the opening degree of the EGR control valve is in the dead zone has been described so far with reference to FIGS.
- the target value of the opening degree of the EGR control valve is not in the dead zone region, that is, when ⁇ > ⁇ 1 in FIG. 5, the target opening degree of the EGR control valve is changed similarly.
- the target value of the EGR control valve opening is not in the dead zone region, the sensitivity of changes such as the EGR gas flow rate, the EGR rate, the intake flow rate, the oxygen excess rate, and the air excess rate with respect to the EGR control valve opening rate is high.
- the minute change in the opening of the EGR control valve affects the effect of reducing harmful substances in exhaust gas by EGR. Therefore, an abnormality of the EGR control valve can be detected by slightly changing the target opening degree of the EGR control valve and confirming the influence on the harmful substance reduction effect in the exhaust gas.
- FIG. 12 is a graph showing the change over time of the target opening of the EGR control valve when the target opening of the EGR control valve is changed in a state where the target opening of the EGR control valve is close to zero.
- the vertical axis represents the target opening of the EGR control valve
- the horizontal axis represents time.
- the target opening of the EGR control valve is slightly changed.
- FIG. 13 is a graph showing a change over time in the target opening of the throttle valve when the target opening of the EGR control valve is changed in a state where the target opening of the EGR control valve is close to zero.
- the vertical axis represents the target opening of the throttle valve
- the horizontal axis represents time. At this time, the target opening of the throttle valve does not change.
- the abnormality of the EGR control valve is detected as described above by minutely changing the target value of the opening degree of the EGR control valve.
- the opening of the EGR control valve is not maintained at the same opening for a long time, it is possible to prevent the EGR control valve from sticking due to damage to the motor bearing due to the occurrence of running out of lubricating oil.
- the EGR control valve When the EGR control valve is opened due to the minute change, smoke is generated. However, the condition for generating smoke is when the engine speed and load increase. Even if the EGR control valve is opened by a small opening amount in a steady state, it does not lead to smoke generation. By making the degree as small as 4 to 8% at a maximum and making the influence on the amount of EGR gas small, the occurrence of the smoke does not become a problem. Further, in the EGR device equipped with the EGR cooler as shown in FIG. 1, the exhaust gas containing smoke and unburned fuel is cooled when passing through the EGR cooler, and the smoke is gradually used with the unburned fuel as a binder. It tends to deposit as a soot.
- FIG. 1 and FIG. 2 used in the first embodiment are also applied to the second embodiment. The description is omitted.
- Example 2 the function for determining the opening degree of the EGR control valve from the parameter ⁇ indicated by 58 in FIG. 2 is provided with hysteresis.
- FIG. 14 shows an example of a function for determining the opening degree of the EGR control valve 24 from the parameter ⁇ in the second embodiment, and corresponds to the function 58 shown in FIG.
- the vertical axis represents the target value of the opening degree of the EGR control valve
- the horizontal axis represents ⁇ .
- region shown by a has shown the dead zone area
- region shown by b has shown the area
- the second embodiment as shown in FIG.
- ⁇ 3 is a boundary value of ⁇ in which the target valve opening is in the dead zone region, and is the same value as ⁇ 1 shown in the upper diagram of FIG. ⁇ 2 is a value smaller than ⁇ 3.
- Example 2 control of the change in the target opening degree of the EGR control valve when a function having hysteresis as shown in FIG. 14 is applied will be described with reference to the flowchart shown in FIG.
- FIG. 15 is a flowchart illustrating a control procedure related to a change in the target opening of the EGR control valve according to the second embodiment.
- step S502 a hysteresis operation determination is performed.
- the hysteresis operation determination is performed according to the flowchart shown in FIG.
- the hysteresis determination flag is a flag for determining whether to perform the EGR valve normal control mode, the EGR valve sticking prevention mode, or the hysteresis operation mode in step S503 described later, and is affected by ⁇ . Value.
- step S601 determines whether or not ⁇ commanded by the logic shown in FIG. 2 is smaller than ⁇ 2. If YES in step S602, that is, if it is determined that ⁇ ⁇ 2, the hysteresis determination flag is changed to ON, and the process ends. If NO in step S602, that is, if it is determined that ⁇ ⁇ ⁇ 2, the process ends without changing the hysteresis determination flag while being OFF.
- step S604 it is determined whether ⁇ is larger than ⁇ 3. If YES in step S604, that is, if ⁇ > ⁇ 3 is determined, the hysteresis determination flag is changed to OFF, and the process ends. If it is determined NO in step S604, that is, ⁇ ⁇ ⁇ 3, the process is terminated without changing the hysteresis determination flag to be ON.
- the hysteresis determination flag is ON when ⁇ ⁇ 2, the hysteresis determination flag is OFF when ⁇ > ⁇ 3, and the process ends. Within the range of ⁇ ⁇ ⁇ ⁇ 3, the current state of the hysteresis determination flag is maintained and the process is terminated.
- step S502 is finished in the flowchart shown in FIG. 15, and the process proceeds to step S503.
- step S503 it is determined whether the hysteresis determination flag is ON. If NO in step S503, that is, if the hysteresis determination flag is OFF, the process proceeds to step S507 and is commanded by the function 58 without forcibly changing the normal control mode of the EGR control valve, that is, the target opening of the EGR control valve as in the conventional case.
- the opening degree of the EGR control valve is controlled according to the opening degree command of the EGR control valve.
- step S503 If YES in step S503, that is, if the hysteresis determination flag is ON, the process proceeds to step S504.
- step S504 it is determined whether or not it is a sticking prevention operation timing. Since the sticking prevention operation time is the same as that described in step S104 in FIG. 8, the description thereof is omitted.
- step S504 If YES in step S504, that is, if it is determined that the sticking prevention operation time is reached, the process proceeds to step S506, where the opening of the EGR control valve is controlled in the EGR valve sticking prevention mode, and the process is terminated.
- the EGR valve sticking prevention mode is the same as that of the first embodiment, and the target value of the opening degree of the EGR control valve is changed in the dead zone region as described with reference to FIGS. Further, the abnormality of the EGR control valve is also determined by the processing of the procedure of the flowchart shown in FIG.
- step S504 If it is determined NO in step S504, that is, it is not the sticking prevention operation timing, the process proceeds to step S505, where the opening degree of the EGR control valve is controlled in the hysteresis operation mode, and the process is terminated.
- FIG. 17 is a flowchart illustrating a processing procedure in the hysteresis operation mode.
- the process proceeds to step S701.
- step S701 the EGR valve opening is fixed to 100% and the process is terminated.
- the opening degree of the EGR control valve is fixed at 100% in the hysteresis operation mode as shown in step S701 in FIG. 17, but the opening degree in the dead zone is other than 100%. It can also be fixed at the opening.
- the opening degree of the EGR control valve is kept constant at the opening degree of the dead zone.
- the present invention detects a failure of a control valve used in an intake system even under an operating condition in which the target opening of the control valve used in the intake system of the engine matches the actual opening and the target opening does not change.
- the control valve used for the intake system that is damaged by the motor bearing caused by running out of lubricating oil caused by holding the control valve used for the intake system at the same opening for a long time. It can be used as a control device and control method for a control valve used in an intake system of an engine that can prevent the occurrence of sticking.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
例えば特許文献1には、EGR制御弁の目標開度が所定量以上変化するEGR運転条件成立時に、目標開度が変化を開始してから目標開度の変化に追従して変化する実開度を実開度検出手段により検出し、検出した実開度が目標開度に追従して変化していないことを確認したときに、EGR制御弁を含む装置が故障したものと判定する技術が開示されている。
特に、EGR制御弁の目標開度が全閉である場合にはEGR制御弁の構造によってはEGR制御弁を全閉方向に押し戻す機能が付いているため、見かけ上は目標開度に実開度が追従しており、故障を検知することができない。
また、前記目標開度を経時的に変化させるので、従来のような目標開度が変化しない運転条件で故障を検知することができないという問題は生じず、目標開度の変化に対する前記吸気系に用いられる制御弁の実開度の追従を確認することで前記吸気系に用いられる制御弁の故障を検知することができる。
EGR制御弁や、スロットルバルブなどの吸気系に用いられる制御弁には、弁の開度変化に対してEGRガス流量、吸気中のEGR混合率(EGR率)、吸気流量、酸素過剰率、空気過剰率などがほとんど変化しない不感帯領域が存在する。不感帯領域は弁の大きさ、構造等によって異なり、その範囲は弁固有のものであるが、開度60~100%程度の範囲が不感帯領域であるものが多い。
前記不感帯領域で、前記目標開度を経時的に変化させることで、該目標開度に追従して吸気系に用いられる制御弁の開度が変化しても、EGRガス流量、吸気中のEGR混合率(EGR率)、吸気流量、酸素過剰率、空気過剰率にほとんど影響しない。従って、エンジンの運転状態にほとんど影響を与えることなく本発明を実施することができる。
これにより、前記吸気系に用いられる制御弁の故障を確実に判断することができる。
これにより、前記目標開度と前記吸気系に用いられる制御弁の実際の開度との差が所定の許容値以上となった原因が吸気系に用いられる制御弁の開度が変化しないことが原因なのか、開度の変化の指令値への追従が遅いことが原因なのかを特定することができる。
これにより、前記目標開度を経時的に変化させる必要がない時期に、前記吸気系に用いられる制御弁が不感帯領域内で頻繁に動作することを回避することができる。これにより、吸気系に用いられる制御弁のバルブシャフトが必要以上に動作し、バルブシャフト部のシールが磨耗し、シール部から排気ガスが漏洩するなどのトラブルを回避することができる。
吸気通路8には、ターボチャージャ14のコンプレッサ14aが設けられている。コンプレッサ14aは後述するタービン14bに同軸駆動されるものである。吸気通路8のコンプレッサ14aよりも下流側には、吸気通路8を流れる吸入空気と大気で熱交換を行うインタークーラー16が設けられている。また、吸気通路8のインタークーラー16よりも下流側には、吸気通路8内を流通する吸入空気の流量を調節するスロットルバルブ18が設けられている。
EGRクーラー22は、EGR制御弁24よりも排気マニホールド10側に設けられ、EGRクーラー22を通過するEGRガスと冷却水とで熱交換して、該EGRガスの温度を低下させるものである。また、EGR制御弁24は、EGR通路20を流れるEGRガスの流量を制御するものである。
ECU40におけるEGR制御弁24及びスロットルバルブ18の開度の制御の概要について説明する。ECU40においては、EGR制御弁24及びスロットルバルブ18の実開度が入力されるとともに、スロットルバルブ18の下流側の吸気通路8又は吸気マニホールド6に取り付けられた、吸気温度センサ28及び吸気圧力センサ30のそれぞれの検出値が、それぞれA/D変換器43、44を介して入力される。また、コンプレッサ14aの上流側の吸気通路8に取り付けられたエアフローメーター26により検出される吸気流量の検出値が、A/D変換器42を介して入力される。さらに、エンジンスピードセンサー32の検出値がパルスカウント回路47を介して入力される。
図3は、EGR制御弁24の特性の一例を示すグラフであり、図4は、スロットルバルブ18の特性の一例を示すグラフである。
図3において、縦軸は酸素過剰率λO2、横軸はEGR制御弁24の開度[%]である。また、図4において、縦軸は酸素過剰率λO2、横軸はスロットルバルブ18の開度[%]である。
図5の上図において、縦軸はEGR制御弁の開度の目標値(指令値)、横軸はθである。図5の下図において、縦軸はスロットルバルブの開度の目標値(指令値)、横軸はθである。
ここで、θはEGR制御弁の開度とスロットルバルブの開度によって決まる値であり、EGR制御弁の開度が100%であるときのスロットルバルブの開度(0~100%)を0~1で表すとともに、スロットルバルブの開度が100%であるときのEGR制御弁の開度(0~100%)を2~1で表したものである。
従って、図5の上図においては、θ=0~1の範囲でEGR制御弁の開度の目標値が100%であり、θ=1~2の範囲ではEGR制御弁の開度の目標値が100%から0%までθに比例して単調減少し、図5の下図においては、θ=0~1の範囲でスロットルバルブの開度の目標値が0%から100%までθに比例して単調増加し、θ=1~2の範囲ではスロットルバルブの開度の目標値は100%となっている。
このような、EGR制御弁の目標開度の不感帯領域における変化は、目標弁開度が不感帯領域にあるθであれば実施可能であり、図5においてはθ<θ1のときに実施可能である。
処理が開始されると、ステップS101で、冷却水温度がT1より高いか否かを判断する。ここで、冷却水とはエンジンの冷却水を意味し、T1は規定温度である。ステップS101でNO即ち冷却水温度がT1以下であればステップS108に進み、EGR運転を行わずEGRを停止し、処理を終了する。ステップS101でYES即ち冷却水温度がT1よりも高ければステップS102に進む。
処理がスタートすると、ステップS201でθがθ1よりも小さいか否かを判断する。ここでθは図2に示したロジックにより指令される値であり、θ1は目標弁開度が不感帯領域にあるθの境界値であり、図5において示したθ1に相当する。
ステップS201でYES即ちθ<θ1であれば、ステップS202に進み不感帯判定フラグをONにして処理を終了する。また、ステップS201でNO即ちθ≧θ1であれば、ステップS203に進み不感帯判定フラグをOFFにして処理を終了する。
ステップS103では、不感帯判定フラグがONであるか否かを判断する。
ステップS3でNO即ち不感帯判定フラグがOFFであればステップS107に進み、EGR制御弁の通常制御モード、即ち従来と同様EGR制御弁の目標開度を強制的に変化させずに関数58によって指令されるEGR制御弁の開度指令に従ってEGR制御弁の開度を制御する。
ステップS104では、固着防止動作時期か否かを判断する。
前述の通り、EGR制御弁の開度が同じ開度で長時間保持することにより、潤滑油切れが発生して、前記モータベアリングの損傷し、EGR制御弁の固着等が発生する。そのため、EGR制御弁の開度の目標値が長時間一定でない場合には前記固着等の発生は生じない。従って、ステップS104においては、固着防止動作を行う必要がある程度の一定時間にわたってEGR制御弁の開度の目標値が一定であるか否かを判断する。即ち、一定時間にわたってEGR制御弁の開度の目標値が一定であれば固着防止動作時期であると判断する。ここで、前記一定時間については、使用するEGR制御弁の性能やエンジン周辺の機器等により、EGR制御弁個々に決定する。
ステップS104でYES即ち固着防止動作時期であると判断されると、ステップS106に進み、EGR弁固着防止モードにてEGR制御弁の開度を制御して処理を終了する。EGR弁固着防止モードにおいては、図5及び図6を用いて説明したように、EGR制御弁の開度の目標値を不感帯領域の範囲で変化させる。これにより、EGR制御弁の目標開度が変化するため、EGR制御弁の開度を同じ開度で長時間保持することによる前記モータベアリングの損傷に起因するEGR制御弁の固着を回避することができる。
図10において、処理が開始されると、ステップS301に進む。
ステップS301では、EGR制御弁の開度の指令値を演算する。これは、図2に示したロジックの手順に従ってθを算出し、該θと関数58を用いて求めることができる。
ステップS302では、EGR制御弁の開度指令を出力する。
ステップS303では、EGR弁開度偏差eを演算する。これは、EGR弁開度の指令値と実測値の差を意味する。
ステップS304では、前記EGR弁解度偏差eの絶対値|e|が許容値よりも大きいか否かを判断する。ここで、前記許容値とは、EGR制御弁の使用時において許容され得る|e|の上限値を意味する。前記許容値は、EGR制御弁の性能やエンジン周辺の機器等により、EGR制御弁個々に決定する値である。
ステップS304でYES即ち、|e|が許容値よりも大きければステップS305に進む。
te=te+ts ・・・(1)
の演算を行う。ここで、teは|e|が許容値よりも大きい状態の継続時間であり、tsは演算周期である。演算周期tsとは、図10におけるフローチャートのスタートからエンドまでの処理が実行される周期を意味する。
(1)式における左辺に示した継続時間teは現在の継続時間であり、右辺に示した継続時間teは1周期前の継続時間を意味する。(1)式に示した演算を行うことにより、|e|が許容値よりも大きい状態の現時点での継続時間を求めることができる。
ステップS306では、ステップS305で演算したteが許容時間より長いか否かを判断する。ここで、前記許容時間とは、|e|が前記許容値よりも大きい状態が継続しても許容され得る上限の時間、即ちteの上限値を意味する。前記許容時間は、EGR制御弁の性能やエンジン周辺の機器等により、EGR制御弁個々に決定する値である。
EGR制御弁が全閉に近く、EGR制御弁の開度の目標値が不感帯領域にない場合、即ち図5においてθ>θ1である場合についても同様に、EGR制御弁の目標開度を変化させる。
この場合には、EGR制御弁開度の目標値が不感帯領域にないので、EGR制御弁開度に対するEGRガス流量、EGR率、吸気流量、酸素過剰率、空気過剰率などの変化の感度が高く、EGR制御弁の微小な開度変化でEGRによる排ガス中の有害物質低減効果に影響を与える。そこで、前記EGR制御弁の目標開度を微小変化させて、排ガス中の有害物質低減効果への影響を確認することで、EGR制御弁の異常を検知することができる。
また、図13は、EGR制御弁の目標開度が0に近い状態においてEGR制御弁の目標開度を変化させた際の、スロットルバルブの目標開度の時間変化を示したグラフである。図13において縦軸はスロットルバルブの目標開度、横軸は時間である。この際、スロットルバルブの目標開度は変化しない。
また、図1に示したようなEGRクーラーを装着したEGR装置においては、スモーク及び未燃燃料分を含む排気がEGRクーラー内を通過する際に冷却され、スモークが未燃燃料分をバインダとして徐々に煤として堆積し易い。そこでEGRクーラーが目詰まりしてEGRクーラーの冷却効率が低下することを防止するために、排気ガス温度が低い条件では、EGR制御弁の目標開度が0に近い状態においてのEGR制御弁の目標開度の微小変化を行わない。
図14は、実施例2における、パラメータθからEGR制御弁24の開度を決定する関数の一例を示したものであり、図2に示した関数58に相当する。
図14において、縦軸はEGR制御弁の開度の目標値、横軸はθである。また、aで示した領域はEGR制御弁の不感帯領域、bで示した領域はEGR制御弁の開度に対する感度がある領域を示している。本実施例2においては、図14に示したように、θ=θ2~θ3の間で関数58にヒステリシスを持たせている。ここで、θ3は、目標弁開度が不感帯領域にあるθの境界値であって、図5の上図に示したθ1と同値である。θ2はθ3よりも小さい値である。
処理が開始されると、ステップS501で、冷却水温度がT1より高いか否かを判断する。ステップS501でNO即ち冷却水温度がT1以下であればステップS508に進み、EGR運転を行わずEGRを停止し、処理を終了する。ステップS501でYES即ち冷却水温度がT1よりも高ければステップS502に進む。
処理がスタートすると、ステップS601で現状におけるヒステリシス判定フラグがOFFであるか否かを判断する。ここでヒステリシス判定フラグとは、後述するステップS503にてEGR弁通常制御モードを行うか、EGR弁固着防止モード又はヒステリシス動作モードを行うかの判断を行うためのフラグであり、θに影響される値である。
ステップS602では、図2に示したロジックにより指令されるθがθ2よりも小さいか否かを判断する。ステップS602でYES即ちθ<θ2であると判断されるとヒステリシス判定フラグをONに変更して処理を終了する。ステップS602でNO即ちθ≧θ2であると判断されるとヒステリシス判定フラグをOFFのまま変更せずに処理を終了する。
ステップS604では、θがθ3よりも大きいか否かを判断する。ステップS604でYES即ちθ>θ3であると判断されるとヒステリシス判定フラグをOFFに変更して処理を終了する。ステップS604でNO即ちθ≦θ3であると判断されるとヒステリシス判定フラグをONのまま変更せずに処理を終了する。
ステップS503でNO即ちヒステリシス判定フラグがOFFであればステップS507に進み、EGR制御弁の通常制御モード、即ち従来と同様EGR制御弁の目標開度を強制的に変化させずに関数58によって指令されるEGR制御弁の開度指令に従ってEGR制御弁の開度を制御する。
ステップS504では、固着防止動作時期か否かを判断する。固着防止動作時期については、図8においてステップS104で説明したものと同じものであるのでその説明を省略する。
図17において、処理が開始されると、ステップS701に進む。
ステップS701では、EGR弁開度を100%に固定して処理を終了する。なお、本実施例2においては、図17におけるステップS701示したようにヒステリシス動作モードでEGR制御弁の開度を100%に固定しているが、不感帯領域の開度であれば100%以外の開度で固定することもできる。
Claims (11)
- エンジンの吸気系統に設けられ、エンジンへの吸気量の制御を行う吸気スロットル弁又はEGR量の制御を行うEGR弁を備え、吸気系に用いられる制御弁と、
前記エンジンの運転状態に応じて前記吸気系に用いられる制御弁の目標開度を決定し、該目標開度に一致するように前記吸気系に用いられる制御弁の開度調整を行う制御手段と、を備えたエンジンの吸気系に用いられる制御弁の制御装置において、
前記制御手段は、前記目標開度が一定時間以上同一のまま維持された場合に、前記目標開度を、前記エンジンの運転状態に応じて決定される目標開度から経時的に変化させて、前記吸気系に用いられる制御弁の故障防止及び故障検知をするように構成されていることを特徴とするエンジンの吸気系に用いられる制御弁の制御装置。 - 前記制御手段は、前記吸気系に用いられる制御弁の開度が変わっても吸気量又はEGR量への影響がない不感帯領域の範囲内で、前記目標開度を経時的に変化させるように構成されていることを特徴とする請求項1記載のエンジンの吸気系に用いられる制御弁の制御装置。
- 前記制御手段は、前記目標開度を経時的に変化させる際に、前記目標開度と前記吸気系に用いられる制御弁の実際の開度との差が所定の許容値以上となる時間が、所定の許容時間以上継続した場合には、前記吸気系に用いられる制御弁が故障したと判断するように構成されていることを特徴とする請求項1又は2記載のエンジンの吸気系に用いられる制御弁の制御装置。
- 前記制御手段は、前記目標開度を経時的に変化させる際に、前記目標開度と前記吸気系に用いられる制御弁の実際の開度との差が所定の許容値以上となった場合には、前記目標開度を変化させずに保持することを特徴とする請求項3記載のエンジンの吸気系に用いられる制御弁の制御装置。
- 前記制御手段は、前記目標開度が前記一定時間以上同一のまま保持されず、前記目標開度が前記不感帯領域の範囲内にある場合に、前記目標開度を強制的に前記不感帯領域の範囲内で一定に固定することを特徴とする請求項1~4何れかに記載のエンジンの吸気系に用いられる制御弁の制御装置。
- 前記制御手段は、前記エンジンの運転状態に応じて決まるパラメータθと、前記目標開度との関係を表す関数を保持し、前記パラメータθによって前記目標開度を決定するものであって、
前記関数にヒステリシスを持たせたことを特徴とする請求項5記載のエンジンの吸気系に用いられる制御弁の制御装置。 - エンジンの運転状態に応じて、エンジンへの吸気量の制御を行うスロットル弁又はEGR量の制御を行うEGR弁である吸気系に用いられる制御弁の目標開度を決定し、該目標開度に一致するように前記吸気系に用いられる制御弁の開度調整を行うエンジンの吸気系に用いられる制御弁の制御方法において、
前記目標開度が一定時間以上同一のまま維持された場合に、前記目標開度を、前記エンジンの運転状態に応じて決定される目標開度から経時的に変化させて、前記吸気系に用いられる制御弁の故障防止及び故障検知をすることを特徴とするエンジンの吸気系に用いられる制御弁の制御方法。 - 前記目標開度を、前記吸気系に用いられる制御弁の開度が変わっても吸気量又はEGR量への影響がない不感帯領域の範囲内で、経時的に変化させることを特徴とする請求項7記載のエンジンの吸気系に用いられる制御弁の制御方法。
- 前記目標開度を経時的に変化させる際に、前記目標開度と前記吸気系に用いられる制御弁の実際の開度との差が所定の許容値以上となる時間が、所定の許容時間以上継続した場合には、前記吸気系に用いられる制御弁が故障したと判断することを特徴とする請求項7又は8記載のエンジンの吸気系に用いられる制御弁の制御方法。
- 前記目標開度を経時的に変化させる際に、前記目標開度と前記吸気系に用いられる制御弁の実際の開度との差が所定の許容値以上となった場合には、前記目標開度を変化させずに保持することを特徴とする請求項9記載のエンジンの吸気系に用いられる制御弁の制御方法。
- 前記目標開度が前記一定時間以上同一のまま保持されず、前記目標開度が前記不感帯領域の範囲内にある場合に、前記目標開度を強制的に前記不感帯領域の範囲内で一定に固定することを特徴とする請求項7~10何れかに記載のエンジンの吸気系に用いられる制御弁の制御方法。
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- 2011-01-13 EP EP11736856.3A patent/EP2444642B1/en active Active
- 2011-01-13 KR KR1020127000432A patent/KR101361907B1/ko active IP Right Grant
- 2011-01-13 WO PCT/JP2011/050473 patent/WO2011093141A1/ja active Application Filing
- 2011-01-13 US US13/388,156 patent/US9500148B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
EP2444642A4 (en) | 2015-11-18 |
US9500148B2 (en) | 2016-11-22 |
EP2444642A1 (en) | 2012-04-25 |
KR101361907B1 (ko) | 2014-02-12 |
US20120130623A1 (en) | 2012-05-24 |
JP2011153578A (ja) | 2011-08-11 |
KR20120024948A (ko) | 2012-03-14 |
EP2444642B1 (en) | 2019-12-25 |
JP5393506B2 (ja) | 2014-01-22 |
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