WO2017033647A1 - 制御装置 - Google Patents
制御装置 Download PDFInfo
- Publication number
- WO2017033647A1 WO2017033647A1 PCT/JP2016/071664 JP2016071664W WO2017033647A1 WO 2017033647 A1 WO2017033647 A1 WO 2017033647A1 JP 2016071664 W JP2016071664 W JP 2016071664W WO 2017033647 A1 WO2017033647 A1 WO 2017033647A1
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- WIPO (PCT)
- Prior art keywords
- intake pipe
- exhaust gas
- humidity
- control device
- pressure
- Prior art date
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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
- 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
- F02M26/03—EGR systems specially adapted for supercharged engines with a single mechanically or electrically driven intake charge compressor
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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
-
- 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
-
- 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
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0418—Air humidity
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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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
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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
- F02M26/25—Layout, e.g. schematics with coolers having bypasses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device mounted on an automobile or the like.
- Patent Document 1 listed below discloses a technique for the purpose of “avoiding the occurrence of dew condensation in the intercooler when EGR gas flowing through the EGR passage and the intake fresh air flowing through the intake passage merge” (see FIG. See summary).
- the technique described in this document is “provided in the low-pressure EGR passage 44 that takes in the low-pressure EGR gas that is part of the exhaust gas from the exhaust pipe 34 of the internal combustion engine 14 and recirculates the low-pressure EGR gas to the intake pipe 22.
- EGR heater 52 for heating the low-pressure EGR gas cooled by the low-pressure EGR cooler 48 to a predetermined temperature.
- exhaust gas (EGR gas) flowing through the EGR passage is cooled by cooling means provided upstream of the EGR passage, and condensed water generated by the cooling action is collected by moisture collecting means. Further, the exhaust gas (EGR gas) that is dewatered and drained through the EGR passage and heated through the EGR passage is heated to a predetermined temperature by the heating means provided on the downstream side of the EGR passage, so that the humidity becomes low.
- the temperature is higher than the temperature of the EGR gas cooled by the cooling means of the EGR passage. Accordingly, it is possible to suitably suppress the occurrence of dew condensation in the intake passage after the merging point. As a result, in the present invention, for example, it is possible to preferably avoid the problem that the elements of the intake system including the supercharger and the intercooler are eroded by the condensed water. (See paragraph 0010).
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an engine control device capable of suppressing condensation in an exhaust gas recirculation pipe or the like.
- the control device controls an engine having an exhaust gas recirculation mechanism for recirculating exhaust gas from an exhaust pipe to an intake pipe and a compressor in the intake pipe.
- the control device controls the exhaust gas recirculation mechanism in accordance with pressure and humidity in the intake pipe.
- control device of the present invention by controlling the exhaust gas recirculation mechanism in accordance with the pressure and humidity in the intake pipe, it is possible to appropriately determine the dew condensation state in the intake pipe, and to control the exhaust gas recirculation mechanism to cause dew condensation. Can be suppressed.
- FIG. 1 is a system configuration diagram of an automobile engine system according to an embodiment.
- 2 is a system block diagram showing a configuration of an ECU 1.
- FIG. 6 is a characteristic diagram of the intake pipe pressure sensor 12, the intake air temperature / humidity sensor 6, and the cooling water temperature sensor 42.
- FIG. It is a calculation logic figure explaining the procedure in which CPU50e calculates the driving mode of a vehicle. It is a characteristic view of the arithmetic logic of each calculating part shown in FIG. It is a determination table used when an operation mode determination part determines operation mode MD. It is a calculation logic figure explaining the procedure in which CPU50e calculates a control value. It is a calculation characteristic figure of a demand output calculation part and an EGR rate target value calculation part.
- the engine is premised on being an automobile engine that includes an exhaust gas recirculation mechanism that recirculates exhaust gas from an exhaust pipe to an intake pipe and includes a compressor in the intake pipe.
- FIG. 1 is a system configuration diagram of an automobile engine system according to the present embodiment.
- An ECU (Electronic Control Unit) 1 is a control device according to the present embodiment.
- the accelerator pedal opening sensor 2 is a sensor that detects the opening of an accelerator pedal provided in the automobile.
- the engine 100 is an automobile engine that performs spark ignition combustion or compression self-ignition combustion.
- the engine 100 includes an intake pipe 3 and an exhaust pipe 26.
- the intake pipe 3 includes an airflow sensor 4 that measures the intake air amount, an adjustment valve 5 that adjusts the flow passage area of the intake pipe 3, and an intake air temperature / humidity sensor 6 that measures intake air temperature or intake air humidity.
- the intake pipe 3 further includes a compressor 7 that adjusts the pressure state of the mixture, and an intercooler 8 that adjusts the temperature of the mixture.
- the air-fuel mixture whose pressure state has been adjusted is temperature-adjusted when passing through the intercooler 8.
- the intercooler 8 may be an air-cooled type, a water-cooled type using a temperature control pump 9 provided with a refrigerant inside, or a combination thereof.
- the air-fuel mixture that has passed through the intercooler 8 is adjusted in flow rate and flow through a throttle 10 and a tumble valve 11 provided in the intake pipe 3, and from the intake side of the variable intake exhaust valve 13 provided in the intake pipe 3 to the combustion chamber. 14 flows in.
- An injector 25 provided at an appropriate position in the combustion chamber 14 supplies fuel to the air-fuel mixture flowing into the combustion chamber 14.
- the injector 25 is provided on the common rail 24.
- the fuel pipe 21 is connected to an appropriate position of the common rail 24.
- a fuel pressure sensor 23 is provided at an appropriate position of the fuel pipe 21.
- the fuel pressure sensor 23 may have a function of measuring temperature or the like.
- a fuel pump 22 is provided at an appropriate position of the fuel pipe 21.
- the fuel pump 22 is driven with electric or mechanical power.
- the fuel pump 22 in the present embodiment is mechanically driven through a camshaft provided in the exhaust valve of the variable intake / exhaust valve 13, but is not limited thereto, and is driven using other power such as an electric motor. May be.
- the spark plug 20 is provided at an appropriate position of the combustion chamber 14.
- the spark plug 20 may include a sensor for measuring the pressure in the combustion chamber 14 or a sensor for measuring the amount of ions generated during combustion in the combustion chamber 14.
- the sensor may be in any position as long as it is exposed to the inner wall of the combustion chamber 14.
- the spark plug 20 is connected to the ignition coil 19 through wiring.
- the energy generated by the ignition coil 19 is supplied to the combustion chamber 14 through the spark plug 20 and ignites the air-fuel mixture.
- the ignited air-fuel mixture burns to increase the pressure in the combustion chamber 14 and push down the piston 15.
- the energy by which the piston 15 is pushed down is transmitted to the crankshaft 17 by the connecting rod 16 and thereby converted into kinetic energy of the vehicle on which the engine 100 is mounted.
- crankshaft 17 or the connecting rod 16 may be provided with a mechanism for adjusting the reciprocating distance of the piston 15.
- an adjustment mechanism such as the control shaft 18 can be provided at an appropriate position of the engine 100.
- a crank angle sensor 40 is provided at an appropriate position of the crankshaft 17.
- Engine 100 further includes knock sensor 41 and cooling water temperature sensor 42 at appropriate positions.
- a waste gate capable of adjusting the amount of exhaust gas flowing into the turbine 27 is provided at an appropriate position of the turbine 27.
- the waste gate can be opened and closed electrically or mechanically.
- Exhaust gas supplied with energy to the turbine 27 passes through the catalyst 29 and is purified while being measured by an air-fuel ratio sensor 28 provided at an appropriate position of the exhaust pipe 26.
- the purified exhaust gas is measured for temperature by an exhaust temperature sensor 30 provided at an appropriate position of the exhaust pipe 26 and is purified again by the catalyst 31.
- a plurality of catalysts are provided, but the number of catalysts is not limited to this, and one or more catalysts can be provided at appropriate positions.
- the exhaust gas recirculation pipe 32 provided in the exhaust pipe 26 is a pipe that takes out the exhaust gas from the exhaust pipe 26 and recirculates it as a recirculation gas.
- the temperature of the recirculated gas taken out is adjusted by an EGR cooler 33 provided at an appropriate position of the exhaust recirculation pipe 32.
- the EGR cooler 33 adjusts the temperature of the reflux gas by air cooling, water cooling, or power generation heat absorption.
- the refrigerant is supplied to the EGR cooler 33.
- a cooling water pump 38 for adjusting the flow rate of the refrigerant and the like is provided at an appropriate position of the engine 100.
- a cooling water pipe 37 is connected to the cooling water pump 38, and a cooling water flow path switching valve 39 for adjusting the refrigerant flow path is provided at an appropriate position of the cooling water pipe 37.
- the temperature of the reflux gas whose temperature is adjusted is measured by the EGR pressure sensors 34 and 36 and the flow rate is adjusted by the EGR valve 35.
- the recirculated gas whose flow rate is adjusted flows into the intake pipe 3 connected to the exhaust recirculation pipe 32.
- the ECU 1 includes an accelerator pedal opening sensor 2, an airflow sensor 4, an intake air temperature / humidity sensor 6, an intake pipe pressure sensor 12, a combustion chamber pressure sensor or an ion current sensor, a fuel pressure sensor 23, an air-fuel ratio sensor 28, an exhaust gas temperature sensor 30, Detection signals are received from EGR pressure sensors 34 and 36, crank angle sensor 40, knock sensor 41, cooling water temperature sensor 42, and the like. In accordance with these received signals, the ECU 1 adjusts the valve 5, the temperature control pump 9, the throttle 10, the tumble valve 11, the variable intake / exhaust valve 13, the control shaft 18, the ignition coil 19, the fuel pump 22, the injector 25, the turbine 27, The EGR valve 35, the cooling water pump 38, the cooling water flow path switching valve 39, and the like are controlled.
- Engine 100 can include other sensors and actuators in addition to the above configuration.
- the engine 100 is mounted on an automobile, and the ECU 1 receives information related to the running state of the automobile.
- the ECU 1 includes (a) a vehicle speed sensor attached to a vehicle body or a wheel on which the engine 100 is mounted, (b) a sensor for measuring acceleration or an angle of the vehicle body, and (c) a transmission attached to the vehicle body on which the engine 100 is mounted. It is also possible to receive a detection signal directly or via another control device from a shift lever position sensor that detects the position of the shift lever for control. Furthermore, it is also possible to receive information related to a driver or a companion who gets in the car.
- FIG. 2 is a system block diagram showing the configuration of the ECU 1.
- Accelerator pedal opening sensor 2 airflow sensor 4, intake air temperature / humidity sensor 6, intake pipe pressure sensor 12, combustion chamber pressure sensor or ion current sensor provided in spark plug 20, fuel pressure sensor 23, air-fuel ratio sensor 28, exhaust temperature sensor 30, detection signals from the EGR pressure sensors 34 and 36, the crank angle sensor 40, the knock sensor 41, the coolant temperature sensor 42, and the like are input to the input circuit 50a of the ECU 1.
- the input signal of each sensor is sent to the input / output port 50b.
- the signal sent to the input / output port 50b is stored in the RAM 50c as a signal value, and the CPU 50e performs arithmetic processing using the signal value.
- a control program describing the contents of arithmetic processing executed by the CPU 50e is stored in the ROM 50d in advance.
- a value indicating the control amount of each actuator calculated according to the control program is stored in the RAM 50c, and then sent to each actuator via the input / output port 50b and each drive circuit.
- the control program may be described as an operation subject, but the CPU 50e actually executes the control program.
- the ECU 1 includes the following drive circuits: a throttle drive circuit 50f, a tumble valve drive circuit 50g, an injector drive circuit 50h, a fuel pump drive circuit 50i, a variable valve drive circuit 50j, a control shaft drive circuit 50k, Ignition signal output circuit 50l, EGR valve drive circuit 50m, cooling water control circuit 50n, temperature control pump drive circuit 50o, waste gate drive circuit 50p.
- Each drive circuit controls the following: adjustment valve 5, temperature control pump 9, throttle 10, tumble valve 11, variable intake / exhaust valve 13, control shaft 18, ignition coil 19, fuel pump 22, injector 25, turbine 27 , EGR valve 35, cooling water pump 38, cooling water flow path switching valve 39.
- these drive circuits are provided in the ECU 1, but the present invention is not limited to this, and any of the drive circuits may be provided outside the ECU 1.
- FIG. 3 is a characteristic diagram of the intake pipe pressure sensor 12, the intake air temperature / humidity sensor 6, and the cooling water temperature sensor 42.
- the upper diagram shows the characteristic that the intake pipe pressure signal output from the intake pipe pressure sensor 12 increases or decreases with the level of the intake pipe pressure.
- the middle diagram shows the characteristic that the humidity signal output from the intake air temperature / humidity sensor 6 increases / decreases with respect to the humidity level.
- the lower diagram shows a characteristic in which the coolant temperature signal output from the coolant temperature sensor 42 increases or decreases with respect to the coolant temperature.
- the characteristics are given so that the signal of each sensor increases as the intake pipe pressure increases, the humidity increases, and the cooling water temperature increases. However, the characteristics are not limited to this. May be given. When the characteristics of each sensor are different from those in FIG. 3, it is easy to set the control logic shown below according to the characteristics.
- FIG. 4 is a calculation logic diagram illustrating a procedure by which the CPU 50e calculates the driving mode of the vehicle.
- the control program executed by the CPU 50e includes a threshold calculation unit, an intake pipe humidity calculation unit, an exhaust gas recirculation temperature calculation unit, and an operation mode determination unit as control blocks.
- the threshold calculation unit and the intake pipe humidity calculation unit receive the intake pipe pressure signal PIS and the humidity signal HS, respectively, and the exhaust gas recirculation pipe humidity calculation unit receives the cooling water temperature signal TWS.
- the outputs of these calculation units are input to the operation mode determination unit.
- the driving mode determination unit determines the driving mode MD of the vehicle based on these inputs. Each threshold value output by the threshold value calculation unit will be described later.
- FIG. 5 is a characteristic diagram of the arithmetic logic of each arithmetic unit shown in FIG.
- the uppermost diagram is a calculation map used when the threshold value calculation unit obtains the exhaust gas recirculation pipe temperature threshold value EGL based on the intake pipe pressure signal PIS and the humidity signal HS. As the intake pipe pressure signal PIS increases and the humidity signal HS increases, the exhaust gas recirculation pipe temperature threshold EGL decreases.
- the upper middle diagram is a characteristic diagram when the threshold calculation unit calculates the intake pipe threshold value IGL based on the product (HS ⁇ PIS) of the intake pipe pressure signal PIS and the humidity signal HS.
- the intake pipe threshold IGL decreases as the product of the intake pipe pressure signal PIS and the humidity signal HS increases.
- the lower middle diagram is a characteristic diagram when the intake pipe humidity calculation unit calculates the humidity index value HII based on the intake pipe pressure signal PIS and the humidity signal HS.
- the humidity index value HII increases as the intake pipe pressure signal PIS increases and the humidity signal HS increases.
- the humidity index value HII is a value that suggests intake humidity.
- the lowermost diagram is a characteristic diagram when the exhaust gas recirculation pipe temperature calculation unit calculates the exhaust gas recirculation pipe temperature EGT based on the cooling water temperature signal TWS. As the cooling water temperature signal TWS increases, the exhaust gas recirculation pipe temperature EGT increases. When the characteristics of each sensor are changed, each calculation unit can easily change each characteristic accordingly.
- the above characteristic is set in advance so that the product of the intake pipe pressure signal PIS and the humidity signal HS becomes a predetermined value corresponding to the dew condensation state or a value standardized by an appropriate reference value in the determination of the operation mode MD described later. .
- the exhaust recirculation pipe temperature threshold value EGL is desirably set in advance so that the physical quantity indicated by the humidity signal HS is doubled when the physical quantity indicated by the intake pipe pressure signal PIS is halved. This makes it possible to accurately determine dew condensation based on changes in pressure and humidity, maximize the effect of controlling the EGR valve that will be performed later, and maximize the effect of suppressing component deterioration and misfire due to condensation, and consequently abnormal combustion. be able to.
- FIG. 6 is a determination table used when the operation mode determination unit determines the operation mode MD.
- the operation mode determination unit compares the exhaust gas recirculation pipe temperature EGT with the exhaust gas recirculation pipe temperature threshold EGL, and compares the humidity index value HII with the intake pipe threshold IGL.
- the operation mode MD is zero.
- the operation mode MD is 1.
- the operation mode MD is 2.
- the operation mode MD is 3.
- the boundary part between the modes may be handled as belonging to any mode as appropriate.
- the operation mode MD When the operation mode MD is 0, it indicates that the exhaust gas recirculation pipe temperature EGT is insufficient and condensation may occur in the exhaust gas recirculation pipe 32 or the like.
- the operation mode MD 2
- the exhaust gas recirculation pipe temperature EGT is sufficiently high, and the possibility of dew condensation occurring in the exhaust gas recirculation pipe 32 is low, and the intake pipe humidity is high and the possibility of dew condensation occurring in the intake pipe 3 or the like.
- FIG. 7 is an arithmetic logic diagram illustrating a procedure for the CPU 50e to calculate the control value.
- the control program executed by the CPU 50e includes the following calculation units as control blocks.
- the operation mode MD is input to the control value calculation unit, and the accelerator pedal opening sensor signal APS and the crank angle sensor signal CAS are input to the request output calculation unit.
- the required output calculation unit includes an EGR rate target value calculation unit, an intake pipe pressure target value calculation unit, a waste gate target value calculation unit, an air-fuel ratio target value calculation unit, a fuel injection target value calculation unit, a tumble valve target value calculation unit, a compression Request output is output to the ratio target value calculation unit, ignition timing target value calculation unit, temperature control pump target value calculation unit, cooling water flow path target value calculation unit, each target value calculation unit according to the input request output To calculate the target value.
- the output of each target value calculation unit is input to the control value calculation unit.
- the control value calculation unit calculates or selects an appropriate control value according to the operation mode MD.
- FIG. 8 is a calculation characteristic diagram of the required output calculation unit and the EGR rate target value calculation unit.
- the upper diagram shows the calculation characteristics of the request output calculation unit.
- the required output calculation unit determines the required output PR according to the level of the frequency of the crank angle sensor signal CAS and the magnitude of the accelerator pedal opening sensor signal APS.
- the required output PR increases as the crank angle sensor signal CAS increases in frequency and the like, and increases as the accelerator pedal opening sensor signal APS increases.
- the calculation characteristic of the required output calculation unit is not limited to this, and for example, the required output PS or the required torque can be calculated based only on the accelerator pedal opening sensor signal APS.
- the lower diagram shows the characteristics of the required output PR and the EGR rate target value REGRT.
- the EGR rate target value calculation unit increases the EGR rate target value REGRT in response to an increase in the required output PR.
- FIG. 9 is a calculation logic diagram illustrating a procedure in which the control value calculation unit calculates the control value based on the operation mode and each target value calculation result.
- the control program executed by the CPU 50e includes the following calculation units as control blocks.
- the control value calculation unit receives the operation mode MD and each target value calculation result, which are respectively an EGR control calculation unit, a throttle control calculation unit, a waste gate control calculation unit, a fuel pump control calculation unit, an injector control calculation unit, and a tumble valve Input to the control calculation unit, the compression ratio control calculation unit, the temperature control pump control calculation unit, and the cooling water flow path control calculation unit.
- Each calculation unit calculates a control value based on the input value.
- Each calculation result is output as a control amount for driving each functional unit included in engine 100.
- Each drive circuit outputs a control signal according to these control amounts.
- FIG. 10 is a calculation characteristic diagram when the EGR control calculation unit calculates the EGR valve opening degree EVO.
- the EGR control calculation unit has a characteristic map that defines a correspondence relationship between the EGR rate target value REGRT and the EGR valve opening degree EVO, and obtains the EGR valve opening degree EVO according to the map.
- the operation mode MD 3 (permission mode)
- a characteristic map that increases the EGR valve opening EVO in accordance with the increase in the EGR rate target value REGRT is used.
- the EGR valve 35 can be controlled corresponding to the prohibit mode and the permit mode.
- FIG. 11 is a flowchart for explaining a control calculation performed by the CPU 50e.
- the CPU 50e repeatedly executes the control calculation described with reference to FIGS. 4 and 7 to 10, for example, at a predetermined cycle.
- each step of FIG. 11 will be described.
- the CPU 50e receives signals such as the intake pipe pressure signal PIS, the humidity signal HS, the cooling water temperature signal TWS, the ROM value reading start instruction signal, the acceleration sensor signal, and the cooling water temperature signal, and reads the values written in the ROM 50d (S101). ).
- the CPU 50e calculates the operation mode MD according to these signals (S102). These steps correspond to the calculation blocks described in FIG.
- Step S103 The CPU 50e reads the accelerator pedal opening sensor signal APS, the engine speed, the crank angle sensor signal CAS, and the like.
- Step S104 The CPU 50e determines whether or not the operation mode MD calculated in step S102 is zero. If it is 0, the process proceeds to step S107, and if it is not 0, the process proceeds to step S105.
- Step S105 The CPU 50e determines whether or not the operation mode MD is 1. If it is 1, the process proceeds to step S107. If it is not 1, the process proceeds to step S106.
- Step S106 The CPU 50e determines whether or not the operation mode MD is 2. If it is 2, the process proceeds to step S107. If it is not 2, the process proceeds to step S116.
- FIG. 11 Steps S107 to S115
- Step S116 The CPU 50e determines whether or not the operation mode MD is 3. If it is 3, the process proceeds to step S117. If it is not 3, this flowchart is ended.
- FIG. 11 Steps S117 to S125
- FIG. 12 is a time chart showing a change with time of each signal value in the prohibit mode.
- the exhaust gas recirculation pipe temperature EGT increases and changes from a value smaller than the exhaust gas recirculation pipe temperature threshold EGL to a larger value.
- the intake pipe pressure signal PIS and the humidity signal HS and the humidity index value HII depending on them are constant and the humidity index value HII is larger than the intake pipe threshold IGL.
- the operation mode MD changes from 1 to 2.
- the EGR valve opening EVO is closed even if the EGR rate target value REGRT increases or decreases.
- the exhaust gas recirculation mechanism is optimally controlled in accordance with the pressure and humidity, the occurrence of condensation in the intake pipe 3 and the exhaust pipe 26, etc. is suppressed, the deterioration of parts and misfire are suppressed, and the fuel consumption, thermal efficiency, and exhaust of the engine are deteriorated. Can be suppressed.
- FIG. 13 is a time chart showing a change with time of each signal value in the permission mode.
- the intake pipe pressure signal PIS and the humidity signal HS change.
- the exhaust gas recirculation pipe temperature threshold value EGL increases and the intake pipe threshold value IGL decreases as the intake pipe pressure signal PIS increases.
- the operation mode MD is zero.
- the operation mode MD is 3 and EGR is permitted.
- the EGR valve opening degree EVO also increases, thereby increasing the EGR rate or the EGR flow rate.
- the humidity signal HS increases, so that the intake pipe threshold IGL decreases and the humidity index value HII increases, but the EGR valve so that the humidity index value HII is less than the intake pipe threshold IGL.
- the exhaust gas recirculation mechanism is optimally controlled in accordance with the pressure and humidity, the dew condensation in the intake pipe 3 and the exhaust pipe 26 is suppressed, the deterioration of components and misfire are suppressed, and the abnormal combustion suppression effect due to the increase in EGR is achieved. Can be maximized. That is, the improvement effect of the fuel consumption, thermal efficiency, and exhaust of the engine can be maximized.
- the input / output signals to / from the ECU 1 have been described with reference to FIGS. 1 and 2.
- other signals are appropriately input / output according to the configuration of the engine 100, and control according to the signals is performed. Arithmetic can also be performed as appropriate.
- each target value calculation unit in FIG. 7 and each calculation unit in FIG. 9 are illustrated as control blocks included in the control program executed by the ECU 1.
- the present invention is not limited to these configurations.
- the operation mode for prohibiting EGR and the operation mode for permitting EGR are exemplified, but other operation modes (for example, an operation mode based on a fail-safe viewpoint) may be provided.
- the intake air temperature / humidity sensor 6 is arranged at a location between the location where the intake pipe 3 and the exhaust gas recirculation pipe 32 are connected to the compressor 7, but at a position upstream of the compressor 7. If there is, it may be arranged at other locations. In any place, a wired or wireless communication path for connecting the intake air temperature / humidity sensor 6 and the ECU 1 can be appropriately provided.
- the above components, functions, processing units, processing means, etc. may be realized in hardware by designing some or all of them, for example, with an integrated circuit.
- Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
- Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
- the ECU 1 according to the present invention suppresses the occurrence of condensation in the intake pipe 3 and the exhaust pipe 26 by opening and closing the exhaust recirculation pipe 32 according to the pressure and humidity in the intake pipe 3. Thereby, generation
- the exhaust gas recirculation pipe 32 is controlled to open and close by a valve mechanism.
- the EGR flow rate can be controlled with high accuracy.
- the exhaust gas recirculation pipe 32 recirculates the exhaust gas from the exhaust pipe 26 to the upstream portion of the compressor 7.
- EGR can be recirculated over the entire range in which the intake pressure is from negative pressure to atmospheric pressure or higher, and the effect of the present invention is maximized.
- the engine 100 uses an intake pipe pressure sensor 12 disposed downstream of the compressor 7 as means for detecting the pressure in the intake pipe 3. Thereby, the pressurization conditions of air-fuel mixture can be grasped appropriately.
- the engine 100 uses an intake air temperature / humidity sensor 6 disposed in the intake pipe 3 as means for detecting the humidity of the intake pipe 3. Thereby, the humidity of the air-fuel mixture actually sucked by the engine can be detected.
- the intake air temperature / humidity sensor 6 is disposed at an upstream portion of the compressor 7 or from an upstream portion of the compressor 7 where the exhaust gas recirculation pipe 32 and the intake pipe 3 are connected. Is also arranged in the downstream part. Thereby, the humidity and EGR flow rate of the intake air can be accurately detected before the compressor 7 or the like changes the intake air pressure.
- the ECU 1 controls the opening and closing of the exhaust gas recirculation pipe 32 so that the exhaust gas is not recirculated when the pressure on the downstream side of the compressor 7 is equal to or higher than the set pressure. That is, when the intake pipe pressure signal PIS increases, the intake pipe threshold IGL decreases (see FIG. 5), and when the intake pipe threshold IGL decreases, the permission mode is not entered unless the humidity index value HII becomes a smaller value (see FIG. 6). As a result, the exhaust gas is less likely to be recirculated. Accordingly, it is possible to suppress an operation that promotes the occurrence of condensation by performing EGR under the condition where condensation occurs.
- the ECU 1 sets a permissible operation range for recirculating the exhaust gas (a range operating in the permissive mode) according to the downstream pressure of the compressor 7 (ie, the intake pipe pressure signal PIS) and the humidity of the intake pipe 3 (ie, the humidity index value HII). To do. Thereby, the dew condensation limit condition of the air-fuel mixture in the intake pipe 3 can be suitably determined.
- the ECU 1 sets the permitted operation range so that the downstream pressure of the compressor 7 decreases as the humidity of the intake pipe 3 increases. Thereby, it is possible to determine with high accuracy a phenomenon in which the dew condensation condition is on the low pressure side in accordance with the increase in the humidity of the air-fuel mixture in the intake pipe 3.
- the ECU 1 sets a prohibited operation range in which exhaust gas is not recirculated (a range in which operation is performed in the prohibited mode) according to the downstream pressure of the compressor 7 (ie, the intake pipe pressure signal PIS) and the humidity of the intake pipe 3 (ie, the humidity index value HII). To do. Specifically, in the prohibit mode, the downstream pressure of the compressor 7 increases as the humidity of the intake pipe 3 decreases. As a result, it is possible to determine with high accuracy a phenomenon in which the dew condensation condition is on the high pressure side in accordance with the humidity reduction of the air-fuel mixture in the intake pipe 3.
- the ECU 1 causes dew condensation based on the threshold value derived from the product of the pressure value indicated by the detection signal of the intake pipe pressure sensor 12 and the humidity value indicated by the detection signal of the intake air temperature / humidity sensor.
- the EGR valve opening EVO is decreased to decrease the EGR flow rate.
- ECU 2 Accelerator pedal opening sensor 3: Intake pipe 4: Airflow sensor 5: Adjustment valve 6: Intake air temperature / humidity sensor 7: Compressor 8: Intercooler 9: Temperature control pump 10: Throttle 11: Tumble valve 12: Intake pipe pressure sensor 13 : Variable intake / exhaust valve 14: Combustion chamber 15: Piston 16: Connecting rod 17: Crankshaft 18: Control shaft 19: Ignition coil 20: Spark plug (including: combustion chamber pressure sensor or ion current sensor) 21: Fuel piping 22: Fuel pump 23: Fuel pressure sensor (including temperature sensor) 24: Common rail 25: Injector 26: Exhaust pipe 27: Turbine (including waste gate) 28: Air-fuel ratio sensor 29: Catalyst 30: Exhaust temperature sensor 31: Catalyst 32: Exhaust gas recirculation pipe 33: EGR cooler 34: EGR pressure sensor 35: EGR valve 36: EGR pressure sensor 37: Cooling water pipe 38: Cooling water pump 39 : Cooling water flow path switching
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
以下では本発明の実施形態として、エンジンの制御装置について説明する。同エンジンは、排気管から吸気管へ排気を還流せしめる排気還流機構を備え、吸気管にコンプレッサを備える、自動車用エンジンであることを前提とする。
CPU50eは、吸気管圧力信号PIS、湿度信号HS、冷却水温度信号TWS、ROM値読込始動指示信号、加速度センサ信号、冷却水温度信号などの信号を受け取り、ROM50dに書き込まれた値を読み込む(S101)。CPU50eは、これら信号などにしたがって運転モードMDを演算する(S102)。これらステップは、図4で説明した演算ブロックに相当する。
CPU50eは、アクセルペダル開度センサ信号APS、エンジン回転数、クランク角センサ信号CAS、などを読み込む。
CPU50eは、ステップS102において演算した運転モードMDが0であるか否かを判定する。0である場合ステップS107へ進み、0でない場合はステップS105へ進む。
CPU50eは、運転モードMDが1であるか否かを判定する。1である場合はステップS107へ進み、1でない場合はステップS106へ進む。
CPU50eは、運転モードMDが2であるか否かを判定する。2である場合はステップS107へ進み、2でない場合はステップS116へ進む。
CPU50eは、図7~図10で説明した各演算部の制御演算をそれぞれ実施する。これらステップにおいては、運転モードMD=0、1、2(禁止モード)に対応する制御演算を実施することになる。したがって例えばEGR制御演算部は、EGR率目標値REGRTの大小によらずEGR弁開度EVOを0またはその近傍にセットする。その他演算部は、EGRの開度が0または0近傍になることを踏まえて各制御量などを演算する。
CPU50eは、運転モードMDが3であるか否かを判定する。3である場合はステップS117へ進み、3でない場合は本フローチャートを終了する。
CPU50eは、図7~図10で説明した各演算部の制御演算をそれぞれ実施する。これらステップにおいては、運転モードMD=3(許可モード)に対応する制御演算を実施することになる。したがって例えばEGR制御演算部は、EGR率目標値が大きくなるにともなってEGR弁開度EVOを大きくする。その他演算部は、EGRの開度が増減することを踏まえて各制御量などを演算する。
本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。
本発明に係るECU1は、吸気管3内の圧力と湿度に応じて排気還流管32を開閉することにより、吸気管3や排気管26などにおいて結露が生じることを抑制する。これにより、混合気の圧力と湿度に応じて結露発生条件が変化する環境下においても、結露の発生およびこれに起因する不具合を抑制することができる。
2:アクセルペダル開度センサ
3:吸気管
4:エアフロセンサ
5:調整弁
6:吸気温湿度センサ
7:コンプレッサ
8:インタクーラ
9:温調ポンプ
10:スロットル
11:タンブル弁
12:吸気管圧力センサ
13:可変吸気排気動弁
14:燃焼室
15:ピストン
16:コネクティングロッド
17:クランクシャフト
18:コントロールシャフト
19:点火コイル
20:点火プラグ(含:燃焼室圧力センサまたはイオン電流センサ)
21:燃料配管
22:燃料ポンプ
23:燃料圧力センサ(含:温度センサ)
24:コモンレール
25:インジェクタ
26:排気管
27:タービン(含:ウェイストゲート)
28:空燃比センサ
29:触媒
30:排気温センサ
31:触媒
32:排気還流管
33:EGRクーラ
34:EGR圧力センサ
35:EGR弁
36:EGR圧力センサ
37:冷却水配管
38:冷却水ポンプ
39:冷却水流路切替弁
40:クランク角センサ
41:ノックセンサ
42:冷却水温センサ
100:エンジン
Claims (12)
- 排気管から吸気管へ排気を還流せしめる排気還流機構を備え、前記吸気管はコンプレッサを備えるエンジンを制御する、制御装置であって、
前記制御装置は、前記吸気管内の圧力と湿度に応じて前記排気還流機構を制御する
ことを特徴とする制御装置。 - 前記排気還流機構は弁機構であり、
前記制御装置は、前記弁機構を開閉する制御信号を出力することにより、排気還流量または排気還流率を制御する
ことを特徴とする請求項1記載の制御装置。 - 前記排気還流機構は、前記排気管から、前記吸気管に備えられたコンプレッサよりも上流部分に対して、前記排気を還流するように構成されており、
前記制御装置は、前記排気還流機構を制御することにより、前記排気を前記排気管から前記吸気管へ還流させる
ことを特徴とする請求項1または2記載の制御装置。 - 前記エンジンは、前記コンプレッサの下流に配置され前記吸気管内の圧力を検出する吸気管圧力センサを備え、
前記制御装置は、前記吸気管圧力センサより前記吸気管内の圧力を取得する
ことを特徴とする請求項1から3のいずれか1項記載の制御装置。 - 前記吸気管は、前記吸気管の湿度を検出する吸気湿度センサを備え、
前記制御装置は、前記吸気湿度センサより前記吸気管の湿度を取得する
ことを特徴とする請求項1から4のいずれか1項記載の制御装置。 - 前記吸気湿度センサは、前記コンプレッサの上流部分のいずれかに配置され、または前記コンプレッサの上流部分であってかつ前記排気還流機構と前記吸気管が連結される箇所よりも下流部分のいずれかに配置されており、
前記制御装置は、前記吸気湿度センサが配置されている箇所と前記制御装置との間を接続する通信路を備える
ことを特徴とする請求項5記載の制御装置。 - 前記制御装置は、前記コンプレッサの下流圧力が設定圧力以上である場合、前記排気が還流されないように前記排気還流機構を制御する
ことを特徴とする請求項1、4、5、または6記載の制御装置。 - 前記制御装置は、前記コンプレッサの下流圧力と前記吸気管の湿度に応じて、前記排気を還流させるように前記排気還流機構を制御する許可動作範囲を設定し、
前記制御装置は、前記許可動作範囲においては前記吸気管の湿度が大きくなるほど前記コンプレッサの下流圧力が小さくなるように、前記許可動作範囲を設定する
ことを特徴とする請求項7記載の制御装置。 - 前記制御装置は、前記コンプレッサの下流圧力と前記吸気管の湿度に応じて、前記排気を還流させないように前記排気還流機構を制御する禁止動作範囲を設定し、
前記制御装置は、前記禁止動作範囲においては前記吸気管の湿度が小さくなるほど前記コンプレッサの下流圧力が大きくなるように、前記禁止動作範囲を設定する
ことを特徴とする請求項7または8に記載の制御装置。 - 前記制御装置は、前記吸気管内の圧力を検出するセンサが出力する検出信号が示す圧力値と、前記吸気管の湿度を検出するセンサが出力する検出信号が示す湿度値との積により導かれる閾値よりも、前記吸気管の湿度を示す指標値のほうが小さくなるように、前記排気還流機構を制御する
ことを特徴とする請求項9記載の制御装置。 - 前記制御装置は、前記吸気管内の圧力が増加するのにともなって前記排気を還流させる量を減少させるように、前記排気還流機構を制御する
ことを特徴とする請求項1または6記載の制御装置。 - 前記制御装置は、前記吸気管内の圧力を検出するセンサが出力する検出信号が示す圧力値が半減すると、前記吸気管の湿度を検出するセンサが出力する検出信号が示す湿度値が2倍になるように、前記排気還流機構を制御する
ことを特徴とする1、6、または11記載の制御装置。
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JP2017536698A JP6450015B2 (ja) | 2015-08-25 | 2016-07-25 | 制御装置 |
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CN112302838B (zh) * | 2019-08-02 | 2022-04-01 | 广州汽车集团股份有限公司 | Egr废气再循环系统及汽车 |
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US6575148B1 (en) * | 2002-02-22 | 2003-06-10 | Cummins, Inc. | Humidity compensation system for an internal combustion engine |
US6725847B2 (en) * | 2002-04-10 | 2004-04-27 | Cummins, Inc. | Condensation protection AECD for an internal combustion engine employing cooled EGR |
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JP2009174444A (ja) * | 2008-01-25 | 2009-08-06 | Honda Motor Co Ltd | Egr装置 |
FR2938301B1 (fr) * | 2008-11-13 | 2010-11-12 | Peugeot Citroen Automobiles Sa | Procede et dispositif de reglage d'une recirculation de gaz d'echappement pour un moteur a combustion interne |
JP2010223179A (ja) * | 2009-03-25 | 2010-10-07 | Toyota Industries Corp | 低圧egr装置を備えた内燃機関 |
DE102012104724A1 (de) * | 2012-05-31 | 2013-12-05 | Fev Gmbh | Abgasrückführvorrichtung für einen Verbrennungsmotor |
US9803590B2 (en) * | 2013-02-22 | 2017-10-31 | Ford Global Technologies, Llc | Humidity sensor diagnostics |
US9329160B2 (en) * | 2013-04-05 | 2016-05-03 | Ford Global Technologies, Llc | Humidity sensor diagnostic method using condensation clearing heater |
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US20180252186A1 (en) | 2018-09-06 |
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