WO2012114500A1 - 多種燃料内燃機関の制御装置 - Google Patents
多種燃料内燃機関の制御装置 Download PDFInfo
- Publication number
- WO2012114500A1 WO2012114500A1 PCT/JP2011/054196 JP2011054196W WO2012114500A1 WO 2012114500 A1 WO2012114500 A1 WO 2012114500A1 JP 2011054196 W JP2011054196 W JP 2011054196W WO 2012114500 A1 WO2012114500 A1 WO 2012114500A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- spark plug
- internal combustion
- ignition timing
- ignition
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0626—Measuring or estimating parameters related to the fuel supply system
- F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B11/00—Engines characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition, e.g. in different cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/02—Checking or adjusting ignition timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
-
- 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
- F02D2041/228—Warning displays
-
- 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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1015—Engines misfires
-
- 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
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor
-
- 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
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
-
- 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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
-
- 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
- F02D41/1497—With detection of the mechanical response of the engine
- F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/121—Testing characteristics of the spark, ignition voltage or current by measuring spark voltage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits
- F02P2017/128—Measuring ionisation of combustion gas, e.g. by using ignition circuits for knock detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
- F02P5/151—Digital data processing using one central computing unit with means for compensating the variation of the characteristics of the engine or of a sensor, e.g. by ageing
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device for a multi-fuel internal combustion engine that can be operated by mixing and burning a plurality of types of fuel.
- Patent Document 1 discloses an internal combustion engine that uses gas fuel as main fuel and liquid fuel as ignition auxiliary fuel. Patent Document 1 describes that when the required discharge voltage exceeds the limit voltage (design voltage) of the ignition plug, liquid fuel is supplied to the internal combustion engine as ignition auxiliary fuel in addition to gas fuel.
- a required discharge voltage which is a voltage necessary for generating a discharge in a spark plug, varies depending on the operating state of the internal combustion engine.
- the required discharge voltage also changes depending on the type of fuel used or the mixing ratio.
- the voltage applied to the spark plug normally satisfies the required discharge voltage regardless of the operating state of the internal combustion engine, the type of fuel used, or the mixing ratio, and discharges to cause ignition of the mixture. Is set to a value that allows The applied voltage to the spark plug is a design value and is a constant value regardless of the operating state of the internal combustion engine.
- the required discharge voltage increases as compared to the normal state.
- the required discharge voltage becomes equal to or higher than the voltage near the applied voltage to the spark plug (including a voltage slightly lower than the applied voltage).
- the ignition of the engine becomes unstable. If the ignition of the air-fuel mixture by the spark plug becomes unstable, combustion failure such as misfire or increase in combustion fluctuations may be caused.
- the present invention has been made in view of the above problems, and an object of the present invention is to more stably ignite an air-fuel mixture in a multifuel internal combustion engine.
- the present invention controls the mixing ratio of a plurality of types of fuel and controls the ignition timing of the spark plug so that the required discharge voltage is lower than the voltage lower than the voltage applied to the spark plug by a certain value. To do.
- control device for a multi-fuel internal combustion engine is: A control device for a multifuel internal combustion engine operable by mixing and burning a plurality of types of fuel, Ignition plug for igniting the air-fuel mixture in the cylinder, a mixture ratio control unit for controlling the mixture ratio of the plurality of types of fuel, and an ignition timing control for controlling the ignition timing of the spark plug based on the mixture ratio of the plurality of types of fuel And comprising
- the mixing ratio control means controls the mixing ratio of a plurality of types of fuel so that the required discharge voltage is not more than a voltage lower than the voltage applied to the spark plug, and the ignition timing control means controls the ignition plug. Control ignition timing.
- the relative dielectric constant of the fuel varies depending on the type. Under the same conditions, the required discharge voltage is higher as the relative dielectric constant of the fuel is lower. When a plurality of types of fuels are mixed and used, under the same conditions, the required discharge voltage increases as the mixing ratio of the fuel having a relatively low relative dielectric constant increases.
- the burning speed of the fuel varies depending on the type. The lower the burning speed of the fuel used, the more the ignition timing of the spark plug can be advanced with respect to the compression stroke top dead center. And the cylinder pressure at the time of ignition falls, so that the ignition timing of a spark plug advances with respect to a compression stroke top dead center. If the relative permittivity of the fuel is the same, the required discharge voltage becomes lower as the in-cylinder pressure becomes lower.
- the required discharge voltage is higher when the fuel A and the fuel B are mixed and the ignition timing of the spark plug is advanced than when only the fuel A is used (that is, the mixing ratio of the fuel A is 100%). May be lower. This is because the effect on the required discharge voltage by advancing the ignition timing of the spark plug rather than the effect on the required discharge voltage due to a decrease in the relative permittivity of the fuel as a whole (the effect on the increase side of the required discharge voltage). This is because (the influence of the required discharge voltage lowering side) may be larger.
- the required discharge voltage is higher when fuel A and fuel B are mixed and the ignition timing of the spark plug is retarded than when only fuel B is used (that is, the mixing ratio of fuel B is 100%). It may be lower. This is because the effect on the required discharge voltage due to the increase in the relative dielectric constant of the fuel as a whole is greater than the effect on the required discharge voltage caused by retarding the ignition timing of the spark plug (the effect on the rising side of the required discharge voltage). This is because (the influence of the required discharge voltage lowering side) may be larger.
- the required discharge voltage is adjusted in consideration of the characteristics of each fuel as described above. That is, in the present invention, the required discharge voltage is higher than the applied voltage to the ignition plug by controlling the mixing ratio of the plurality of types of fuel by the mixing ratio control means and controlling the ignition timing of the spark plug by the ignition timing control means. Make the voltage lower than a certain value. As a result, in the multi-fuel internal combustion engine, it is possible to perform ignition of the air-fuel mixture more stably.
- the mixing ratio of a plurality of types of fuel and the ignition timing of the spark plug are controlled so that the required discharge voltage is equal to or lower than a voltage lower than the voltage applied to the spark plug by a certain value.
- the constant value is a value of a voltage difference from the applied voltage at which the air-fuel mixture can be stably ignited.
- the control apparatus for a multi-fuel internal combustion engine may further include an ignition failure detection unit that detects an ignition failure to the air-fuel mixture in the cylinder.
- the mixing rate control means controls the mixing ratio of a plurality of types of fuel
- the ignition timing control means controls the ignition timing of the spark plug.
- the discharge voltage may be reduced. According to this, when the ignition failure to the air-fuel mixture occurs, the ignition failure can be eliminated.
- the control apparatus for a multi-fuel internal combustion engine may further include a deterioration determination unit that determines whether or not the deterioration degree of the fire plug is equal to or higher than a predetermined deterioration degree.
- a deterioration determination unit determines whether or not the deterioration degree of the fire plug is equal to or higher than a predetermined deterioration degree.
- the mixture ratio control The required discharge voltage may be reduced by controlling the mixing ratio of a plurality of types of fuel by means and controlling the ignition timing of the spark plug by the ignition timing control means.
- the predetermined deterioration degree and the predetermined high demand discharge voltage region are determined so that the operating state of the multi-fuel internal combustion engine belongs to the predetermined high demand discharge voltage region when the deterioration degree of the spark plug is equal to or higher than the predetermined deterioration degree.
- the degree of deterioration and the operating region in which it can be determined that a poor ignition of the air-fuel mixture is likely to occur are predetermined based on experiments and the like.
- the air-fuel mixture in the multi-fuel internal combustion engine, can be ignited more stably.
- FIG. 1 is a diagram illustrating a schematic configuration of an internal combustion engine according to a first embodiment and its fuel system and intake / exhaust system.
- FIG. It is a figure which shows the relationship between the request
- 3 is a flowchart showing a flow of control of a first fuel mixture ratio and ignition timing according to the first embodiment.
- 4 is a flowchart showing a flow of control of a second fuel mixture ratio and ignition timing according to the first embodiment.
- 6 is a flowchart showing a flow of control of a fuel mixing ratio and ignition timing according to a second embodiment. It is a figure which shows the relationship between the engine speed of an internal combustion engine and a request
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine and its fuel system and intake / exhaust system according to the present embodiment.
- the internal combustion engine 1 is a spark ignition engine for driving a vehicle that uses gasoline and compressed natural gas (hereinafter referred to as CNG) as fuel.
- CNG compressed natural gas
- the internal combustion engine 1 is a multi-fuel internal combustion engine that can be operated by burning only gasoline or only CNG, and can also be operated by mixing and burning gasoline and CNG.
- the internal combustion engine 1 has four cylinders 2. Each cylinder 2 is provided with a spark plug 3. A predetermined voltage is applied to the spark plug 3 from a battery (not shown). As a result, a discharge is generated between the electrodes of the spark plug 3 protruding into the combustion chamber in the cylinder 2, and the mixture is ignited.
- An intake manifold 4 and an exhaust manifold 5 are connected to the internal combustion engine 1.
- An intake passage 6 is connected to the intake manifold 4.
- An exhaust passage 7 is connected to the exhaust manifold 5.
- the four branch pipes of the intake manifold 4 are connected to the respective cylinders 2.
- Each branch pipe is provided with a gasoline injector 8 for injecting gasoline and a CNG injector 9 for injecting CNG.
- a gasoline injector may be provided in each cylinder, and gasoline may be injected into the cylinder.
- a CNG injector may be provided in each cylinder, and CNG may be injected into the cylinder.
- Each gasoline injector 8 is connected to a gasoline delivery pipe 10.
- One end of a gasoline supply passage 12 is connected to the gasoline delivery pipe 10, and the other end of the gasoline supply passage 12 is connected to a gasoline tank 13.
- a feed pump 14 is installed in the gasoline supply passage 12. Gasoline is supplied from the gasoline tank 13 to the gasoline delivery pipe 10 via the gasoline supply passage 12, and further, gasoline is supplied from the gasoline delivery pipe 10 to each gasoline injector 8.
- Each CNG injector 9 is connected to a delivery pipe 11 for CNG.
- One end of a CNG supply passage 15 is connected to the CNG delivery pipe 11, and the other end of the CNG supply passage 15 is connected to a CNG tank 16.
- a regulator 17 is installed in the CNG supply passage 15. CNG is supplied from the CNG tank 16 to the CNG delivery pipe 11 via the CNG supply passage 15, and further CNG is supplied from the CNG delivery pipe 11 to each CNG injector 9.
- the CNG delivery pipe 11 is provided with a pressure sensor 23 that detects the pressure of the CNG in the CNG delivery pipe 11 and a temperature sensor 24 that detects the temperature of the CNG. Further, a pressure sensor 25 that detects the pressure of CNG in the CNG supply passage 15 and a temperature sensor 26 that detects the temperature of the CNG are also provided upstream of the regulator 17 in the CNG supply passage 15.
- an air cleaner 18, an air flow meter 22, and a throttle valve 19 are installed in order from the upstream side.
- An exhaust gas purification catalyst 21 configured by an air-fuel ratio sensor 27 that detects the air-fuel ratio of exhaust gas and a three-way catalyst is installed in the exhaust passage 7.
- the internal combustion engine 1 is provided with an electronic control unit (ECU) 20.
- the ECU 20 is a unit that controls the operating state of the internal combustion engine 1 and the like.
- An air flow meter 22, pressure sensors 23 and 25, temperature sensors 24 and 26, and an air-fuel ratio sensor 27 are electrically connected to the ECU 20.
- a crank angle sensor 28 that detects the crank angle of the internal combustion engine 1 is also electrically connected to the ECU 20. Output signals from the sensors are input to the ECU 20.
- the ECU 20 derives the engine speed of the internal combustion engine 1 based on the output signal of the crank angle sensor 28.
- the ECU 20 is electrically connected to each gasoline injector 8, each CNG injector 9, a feed pump 14, a regulator 17, and a throttle valve 19. These are controlled by the ECU 20. Further, the ECU 20 is electrically connected to a warning display unit 30 provided in a vehicle on which the internal combustion engine 1 is mounted. The function of the warning display unit 30 will be described later.
- FIG. 2 is a diagram showing the relationship between the required discharge voltage Vde, the CNG mixing ratio Rcng in the whole fuel supplied to the internal combustion engine 1, and the ignition timing Tig of the spark plug 3 according to the present embodiment.
- FIG. 2 represents the mixing ratio Rcng of CNG in the whole fuel supplied to the internal combustion engine 1.
- the horizontal axis in FIG. A CNG mixing ratio Rcng of 0% indicates that the internal combustion engine 1 is operated only with gasoline, and a CNG mixing ratio Rcng of 100% indicates that the internal combustion engine 1 is operated only with CNG.
- the vertical axis in the upper part of FIG. 2 represents the required discharge voltage Vde.
- the vertical axis in the lower part of FIG. 2 represents the ignition timing Tig of the spark plug 3.
- the ignition timing Tig of the spark plug 3 is represented by an advance angle (BTDC: Before Top Dead Centre) with reference to the top dead center of the compression stroke.
- BTDC Before Top Dead Centre
- CNG has a lower dielectric constant than gasoline. Therefore, when only CNG is supplied to the internal combustion engine 1 under the same conditions, the required discharge voltage Vde is higher than when only gasoline is supplied to the internal combustion engine 1. When both gasoline and CNG are supplied to the internal combustion engine 1, the required discharge voltage Vde increases as the mixing ratio of CNG increases under the same conditions.
- CNG has a lower combustion speed than gasoline. Therefore, when the CNG mixing ratio Rcng in the whole fuel supplied to the internal combustion engine 1 is higher than the predetermined ratio ⁇ , the ignition timing Tig of the spark plug 3 can be advanced to MBT (Minimum Advance for Best Torque). However, when the CNG mixture ratio Rcng in the whole fuel supplied to the internal combustion engine 1 is lower than the predetermined ratio ⁇ , if the ignition timing Tig of the spark plug 3 is advanced to MBT, the fuel combustion speed is high, which is too early. Ignites and knocks. Therefore, in this case, the ignition timing Tig of the spark plug 3 is controlled to a TK (Trace Knock) point, which is a timing that is later than the MBT and can suppress the occurrence of knocking.
- TK Race Knock
- the in-cylinder pressure at the time of ignition decreases as the ignition timing Tig of the spark plug 3 is advanced with respect to the top dead center of the compression stroke.
- the lower the in-cylinder pressure the easier the discharge occurs in the spark plug 3. That is, if the relative dielectric constant of the fuel supplied to the internal combustion engine 1 is the same, the required discharge voltage Vde decreases as the ignition timing Tig is advanced.
- the voltage applied to the spark plug 3 satisfies the required discharge voltage in a normal state regardless of the operating state of the internal combustion engine 1 and the mixing ratio of CNG and gasoline, and discharge occurs to the mixture.
- the value is set so that the ignition can be performed.
- the applied voltage is a design value and is a constant value regardless of the operating state of the internal combustion engine 1 or the like.
- FIG. 3 is a flowchart showing a flow of control of the first fuel mixture ratio and ignition timing according to the present embodiment. This flow shows the control flow of the fuel mixture ratio and ignition timing when ignition failure occurs when CNG combustion in which only CNG is supplied to the internal combustion engine 1 is performed. This flow is stored in advance in the ECU 20, and is repeatedly executed by the ECU 20 at predetermined intervals.
- step S101 it is determined whether CNG combustion is being performed. If a negative determination is made in step S101, the execution of this flow is temporarily terminated. On the other hand, if an affirmative determination is made in step S101, it is then determined in step S102 whether or not an ignition failure has occurred in the air-fuel mixture by the spark plug 3.
- the determination as to whether or not an ignition failure has occurred may be performed using any known method. For example, it may be determined whether or not an ignition failure has occurred based on the fluctuation amount of the engine speed of the internal combustion engine 1. If the fluctuation amount of the engine speed of the internal combustion engine 1 is larger than a predetermined threshold value, it can be determined that an ignition failure has occurred. Further, when an in-cylinder pressure sensor is provided in each cylinder 2, it is possible to determine whether or not an ignition failure has occurred based on a detection value in the in-cylinder pressure sensor. If the in-cylinder pressure at the original combustion timing is smaller than a predetermined threshold, it can be determined that an ignition failure has occurred.
- ignition failure occurs based on the ion current value in the cylinder 2, the HC concentration of the exhaust discharged from the internal combustion engine 1, or the temperature of the exhaust, which is a parameter highly correlated with the combustion state in the cylinder 2. It can also be determined whether or not.
- step S102 If a negative determination is made in step S102, the execution of this flow is temporarily terminated. On the other hand, if an affirmative determination is made in step S102, then in step S103, the first predetermined mixing ratio R1 and the first predetermined ignition timing Tig1 are calculated based on the current operating state of the internal combustion engine 1.
- the first predetermined mixing ratio R1 and the first predetermined ignition timing Tig1 are the same as the mixing ratio of CNG and gasoline and the spark plug whose required discharge voltage is equivalent to that during gasoline combustion when only gasoline is supplied to the internal combustion engine 1.
- 3 is the ignition timing.
- FIG. 2 there is a map showing the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline (CNG mixing ratio Rcng in the entire fuel), and the ignition timing Tig of the spark plug 3.
- the ECU 20 is stored in advance corresponding to each operation state of the internal combustion engine 1.
- the actual required discharge voltage varies depending on the degree of deterioration of the spark plug 3, the amount of deposit deposited on the electrode of the spark plug 3, and the like.
- the map shows the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3 when the spark plug 3 is assumed to be in a predetermined state (for example, the initial state). It shows the relationship.
- the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3 when the spark plug 3 is in a predetermined state can be obtained based on experiments or the like.
- the first predetermined mixing ratio R1 and the first predetermined ignition timing Tig1 are calculated from the map.
- step S104 mixed combustion in which both CNG and gasoline are supplied to the internal combustion engine 1 is started.
- the mixing ratio of CNG and gasoline is controlled to the first predetermined mixing ratio R1, and the ignition timing by the spark plug 3 is controlled to the first ignition timing Tig1.
- the required discharge voltage decreases. If the required discharge voltage is equal to or lower than a voltage lower than a voltage applied to the spark plug 3, the ignition failure is eliminated.
- the constant value is a value of a voltage difference from the applied voltage at which the mixture can be stably ignited.
- step S105 it is determined whether or not the ignition failure has been resolved. If an affirmative determination is made in step S105, the execution of this flow is temporarily terminated. On the other hand, if a negative determination is made in step S105, it is then determined in step S106 whether or not the mixing ratio of CNG and gasoline has already reached the second predetermined mixing ratio R2.
- the second predetermined mixing ratio R2 is the above-described map indicating the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3, and the required discharge voltage Vde is This is the mixing ratio of CNG and gasoline at the lowest value.
- the ignition ratio of the ignition plug 3 can be changed even if the mixing ratio of CNG and gasoline and the ignition timing of the spark plug 3 are further changed. It is difficult to eliminate defects. In this case, it can be determined that there is a problem such that the degree of deterioration of the spark plug 3 is very large or a large amount of deposit is deposited on the electrode of the spark plug 3.
- step S106 if an affirmative determination is made in step S106, then in step S107, a warning for prompting the driver or the like of the vehicle equipped with the internal combustion engine 1 to replace or repair the spark plug 3 is displayed in the warning display unit 30. Is displayed.
- step S108 the mixing ratio of CNG and gasoline is changed.
- the supply ratio of CNG to the internal combustion engine 1 is decreased by a predetermined ratio X%, and the supply ratio of gasoline to the internal combustion engine 1 is increased by the predetermined ratio X%.
- step S108 the ignition timing of the spark plug 3 is retarded to the ignition timing corresponding to the changed mixing ratio of CNG and gasoline (however, before and after the change of the mixing ratio of CNG and gasoline, If the ignition timing corresponding to the mixing ratio is the same, the ignition timing is maintained.) That is, in step S108, the mixing ratio of CNG and gasoline and the ignition timing of the spark plug 3 are changed in such a direction that the required discharge voltage further decreases. Thereafter, the process of step S105 is executed again.
- the required discharge voltage can be reduced when ignition failure occurs in the air-fuel mixture due to deterioration of the spark plug 3 or deposit deposition on the electrode of the spark plug 3 during CNG combustion. it can.
- the required discharge voltage is reduced to a voltage lower than a voltage lower than a voltage applied to the spark plug 3 by a certain value, whereby the ignition failure can be eliminated.
- the required discharge voltage may be reduced by switching to gasoline combustion, thereby eliminating the ignition failure.
- the required discharge voltage can be reduced while using CNG as fuel as much as possible. Therefore, gasoline consumption can be reduced compared with the case of switching to gasoline combustion.
- the mixing ratio of CNG and gasoline is controlled to the first predetermined mixing ratio R1, and the ignition timing of the spark plug 3 is set to the first predetermined mixing ratio R1.
- the corresponding first predetermined ignition timing Tig1 is controlled. If the ignition failure is still not solved, the CNG and gasoline mixing ratio and the ignition timing of the spark plug 3 are fed back within the range until the CNG and gasoline mixing ratio reaches the second predetermined mixing ratio R2. Control.
- the mixing ratio of CNG and gasoline may be controlled from the beginning to the second predetermined mixing ratio R2. In this case, the ignition timing of the spark plug 3 is also controlled from the beginning to the second predetermined ignition timing corresponding to the second predetermined mixing ratio R2.
- FIG. 4 is a flowchart showing a flow of control of the second fuel mixture ratio and ignition timing according to the present embodiment. This flow shows the flow of control of the fuel mixture ratio and ignition timing when ignition failure occurs when gasoline combustion is performed in which only gasoline is supplied to the internal combustion engine 1. This flow is stored in advance in the ECU 20, and is repeatedly executed by the ECU 20 at predetermined intervals.
- step S201 it is determined whether gasoline combustion is being performed. If a negative determination is made in step S201, the execution of this flow is temporarily terminated. On the other hand, if an affirmative determination is made in step S201, it is then determined in step S202 whether or not an ignition failure to the air-fuel mixture by the spark plug 3 has occurred.
- the processing content of step S202 is the same as the processing content of step S102 of the flowchart shown in FIG.
- step S203 the second predetermined mixing ratio R2 and the second predetermined ignition timing Tig2 are calculated based on the current operating state of the internal combustion engine 1.
- the second predetermined mixing ratio R2 is such that the required discharge voltage Vde is the lowest value on the map indicating the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3. Is the mixing ratio of CNG and gasoline.
- the second predetermined ignition timing Tig2 is an ignition timing of the spark plug 3 corresponding to the second predetermined mixing ratio.
- step S203 the second predetermined mixing ratio R2 and the second predetermined ignition timing Tig2 are the same as the case where the first predetermined mixing ratio R1 and the first predetermined ignition timing Tig1 are calculated in step S103 of the flowchart shown in FIG. It is calculated from a map stored in the ECU 20 that shows the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3.
- step S204 mixed combustion in which both CNG and gasoline are supplied to the internal combustion engine 1 is started.
- the mixing ratio of CNG and gasoline is controlled to the second predetermined mixing ratio R2, and the ignition timing by the spark plug 3 is controlled to the second ignition timing Tig2.
- the required discharge voltage decreases. If the required discharge voltage is equal to or lower than a voltage lower than a voltage applied to the spark plug 3, the ignition failure is eliminated.
- step S205 it is determined whether or not the ignition failure has been resolved.
- the processing content of step S205 is the same as the processing content of step S105 of the flowchart shown in FIG. If an affirmative determination is made in step S205, the execution of this flow is temporarily terminated. On the other hand, if a negative determination is made in step S205, a warning for prompting the driver or the like of the vehicle equipped with the internal combustion engine 1 to replace or repair the spark plug 3 is displayed on the warning display unit 30 in step S206. Is displayed.
- the processing content of step S206 is the same as the processing content of step S107 of the flowchart shown in FIG.
- the required discharge voltage Vde becomes lower than that during gasoline combustion.
- the required discharge voltage is reduced as much as possible by switching to mixed combustion.
- the ignition failure can be eliminated by lowering the required discharge voltage to a voltage lower than a voltage lower than a voltage applied to the spark plug 3 by a certain value.
- the ECU 20 that executes the processes of steps S104 and S108 in the flowchart shown in FIG. 3 or the ECU 20 that executes the process of step S204 in the flowchart shown in FIG. corresponds to an ignition timing control unit.
- ECU20 which performs the process of step S102 of the flowchart shown in FIG. 3, or ECU20 which performs the process of step S202 of the flowchart shown in FIG. 4 is equivalent to the ignition failure detection part which concerns on this invention.
- Example 2 [Control of fuel mixing ratio and ignition timing]
- the schematic configuration of the internal combustion engine according to the present embodiment and its fuel system and intake / exhaust system is the same as the schematic configuration of the internal combustion engine according to the first embodiment and its fuel system and intake / exhaust system.
- the higher the degree of deterioration of the spark plug 3 the higher the required discharge voltage, and the more likely the ignition failure occurs. Therefore, in this embodiment, when the degree of deterioration of the spark plug 3 becomes higher to some extent, the fuel mixture ratio and the ignition timing are controlled when the operation state of the internal combustion engine 1 becomes an operation state where the required discharge voltage is relatively high. As a result, the required discharge voltage is reduced.
- FIG. 5 is a flowchart showing a flow of control of the fuel mixture ratio and ignition timing according to the present embodiment. This flow is stored in advance in the ECU 20, and is repeatedly executed by the ECU 20 at predetermined intervals.
- step S301 it is determined whether CNG combustion is being performed. If a negative determination is made in step S301, the execution of this flow is temporarily terminated. On the other hand, if an affirmative determination is made in step S301, it is then determined in step S302 whether or not the deterioration degree DL of the spark plug 3 is equal to or greater than a predetermined deterioration degree DL0.
- Whether or not the deterioration degree DL of the spark plug 3 is greater than or equal to a predetermined deterioration degree DL0 may be determined based on whether or not a parameter value highly correlated with the deterioration degree DL is equal to or greater than a predetermined threshold value.
- the parameter having a high correlation with the deterioration degree DL of the spark plug 3 include an accumulated time of CNG combustion, a travel distance of a vehicle on which the internal combustion engine 1 is mounted, an accumulated value of a high load operation time, and the like.
- step S302 If a negative determination is made in step S302, the execution of this flow is temporarily terminated. On the other hand, if an affirmative determination is made in step S302, it is then determined in step S303 whether or not the current operating state of the internal combustion engine 1 belongs to a predetermined high required discharge voltage region.
- FIG. 6 is a diagram showing the relationship between the engine speed of the internal combustion engine 1 and the required discharge voltage during high load operation.
- the horizontal axis represents the engine speed Ne of the internal combustion engine 1
- the vertical axis represents the required discharge voltage Vde.
- the required discharge voltage Vde is higher as the engine speed is lower.
- the shaded area corresponds to a predetermined high required discharge voltage region.
- the required discharge voltage varies depending on the engine load. That is, the required discharge voltage is higher as the engine load is higher. Therefore, in practice, the predetermined high required discharge voltage region is determined on a three-dimensional map using the engine speed and the engine load as parameters. In step S303, it is determined using the map whether or not the operating state of the internal combustion engine 1 belongs to a predetermined high required discharge voltage region.
- the deterioration degree DL of the spark plug 3 is greater than or equal to the predetermined deterioration degree DL0.
- the deterioration degree and the operating region in which it can be determined that a poor ignition to the air-fuel mixture is likely to occur are determined based on experiments and the like. Is remembered.
- step S304 the second predetermined mixing ratio R2 and the second predetermined ignition timing Tig2 are calculated based on the current operating state of the internal combustion engine 1.
- the second predetermined mixing ratio R2 is such that the required discharge voltage Vde is the lowest value on the map indicating the relationship between the required discharge voltage Vde, the mixing ratio of CNG and gasoline, and the ignition timing Tig of the spark plug 3. Is the mixing ratio of CNG and gasoline.
- the second predetermined ignition timing Tig2 is an ignition timing of the spark plug 3 corresponding to the second predetermined mixing ratio.
- the processing content of step S304 is the same as the processing content of step S203 of the flowchart shown in FIG.
- step S305 mixed combustion in which both CNG and gasoline are supplied to the internal combustion engine 1 is started.
- the mixing ratio of CNG and gasoline is controlled to the second predetermined mixing ratio R2, and the ignition timing by the spark plug 3 is controlled to the second ignition timing Tig2.
- the processing content of step S305 is the same as the processing content of step S204 of the flowchart shown in FIG.
- the mixing ratio of CNG and gasoline is controlled to the first predetermined mixing ratio R1, and the ignition timing of the spark plug 3 is controlled to the first ignition timing Tig1.
- the first predetermined mixing ratio R1 and the first predetermined ignition timing Tig1 are the mixing ratio of CNG and gasoline at which the required discharge voltage is equivalent to that during gasoline combustion and the ignition timing by the spark plug 3. Even when controlled in this way, the required discharge voltage can be reduced, so that the occurrence of poor ignition can be suppressed.
- the mixing ratio of CNG and gasoline is controlled to the second predetermined mixing ratio R2 and the ignition timing of the spark plug 3 is controlled to the second ignition timing Tig2, the required discharge voltage can be lowered, so that the ignition It becomes possible to suppress defects with a higher probability.
- the deterioration degree of the spark plug 3 is more easily promoted during CNG combustion than during gasoline combustion. Therefore, in the above flow, when the deterioration degree DL of the spark plug 3 becomes equal to or higher than the predetermined deterioration degree DL0 during the CNG combustion, the mixed combustion is performed when the operating state of the internal combustion engine 1 belongs to the high required discharge voltage region. The required discharge voltage was reduced by starting. However, the same control may be performed when the deterioration degree DL of the spark plug 3 becomes equal to or greater than the predetermined deterioration degree DL0 during gasoline combustion. According to this, the occurrence of ignition failure during gasoline combustion can be suppressed as much as possible.
- the ECU 20 that executes the process of step S305 in the flowchart shown in FIG. 5 corresponds to the mixing ratio control unit and the ignition timing control unit according to the present invention. Moreover, ECU20 which performs the process of step S302 of the flowchart shown in FIG. 5 is equivalent to the deterioration determination part which concerns on this invention.
- the fuel of the internal combustion engine 1 is CNG and gasoline.
- the present invention can also be applied to multi-fuel internal combustion engines that use other fuels.
- Gas fuel has a lower dielectric constant and a lower combustion rate than liquid fuel. Therefore, the present invention can be applied to a multi-fuel internal combustion engine that uses a gas fuel other than CNG and a liquid fuel other than gasoline.
- gas fuel other than CNG include hydrogen gas or LPG.
- methanol or ethanol etc. can be illustrated as liquid fuels other than gasoline.
- the present invention can be applied to any multi-fuel internal combustion engine that uses a combination of fuels having different dielectric constants and combustion speeds other than a combination of gas fuel and liquid fuel.
Abstract
Description
複数種類の燃料を混合燃焼させることで運転可能な多種燃料内燃機関の制御装置であって、
気筒内の混合気への点火を行う点火プラグと
複数種類の燃料の混合割合を制御する混合割合制御部と
複数種類の燃料の混合割合に基づいて前記点火プラグの点火時期を制御する点火時期制御部と、を備え、
要求放電電圧が前記点火プラグへの印加電圧よりも一定値低い電圧以下となるように、前記混合割合制御手段によって複数種類の燃料の混合割合を制御すると共に前記点火時期制御手段によって前記点火プラグの点火時期を制御する。
[概略構成]
図1は、本実施例に係る内燃機関とその燃料系及び吸排気系との概略構成を示す図である。内燃機関1は、ガソリン及び圧縮天然ガス(以下、CNGと称する)を燃料として使用する車両駆動用の火花点火式エンジンである。内燃機関1は、ガソリンのみ又はCNGのみを燃焼させることでも運転でき、またガソリンとCNGとを混合燃焼させることでも運転できる多種燃料内燃機関である。
本実施例に係る、要求放電電圧、ガソリンとCNGとの混合割合、及び点火プラグの点火時期の関係について図2に基づいて説明する。図2は、本実施例に係る、要求放電電圧Vde、内燃機関1に供給される燃料全体におけるCNGの混合割合Rcng、及び点火プラグ3の点火時期Tigとの関係を示す図である。
本実施例においては、点火プラグ3への印加電圧は、通常の状態では内燃機関1の運転状態やCNGとガソリンとの混合割合に関わらず、要求放電電圧を満たし、放電が生じて混合気への点火を行うことができるような値に設定されている。該印加電圧は、設計値であり、内燃機関1の運転状態等に関わらず、一定の値である。
[燃料混合割合及び点火時期の制御]
本実施例に係る内燃機関とその燃料系及び吸排気系との概略構成は実施例1に係る内燃機関とその燃料系及び吸排気系との概略構成と同様である。内燃機関1においては、同一運転状態且つ同一燃料であっても、点火プラグ3の劣化度合いが高くなるほど、要求放電電圧が高くなるため、点火不良が生じ易くなる。そこで、本実施例においては、点火プラグ3の劣化度合いがある程度以上高くなると、内燃機関1の運転状態が要求放電電圧が比較的高い運転状態となった時に、燃料混合割合及び点火時期を制御することで、要求放電電圧を低下させる。
上記実施例1及び2では、内燃機関1の燃料をCNG及びガソリンとした。しかしながら、本発明は、他の燃料を使用する多種燃料内燃機関にも適用することができる。ガス燃料は液体燃料に比べて比誘電率が低く且つ燃焼速度が低い。従って、CNG以外のガス燃料とガソリン以外の液体燃料とを使用する多種燃料内燃機関にも本発明を適用することができる。CNG以外のガス燃料としては、水素ガス又はLPG等を例示することができる。また、ガソリン以外の液体燃料としては、メタノール又はエタノール等を例示することができる。また、ガス燃料と液体燃料との組み合わせ以外でも、比誘電率及び燃焼速度が異なる燃料を組み合わせて使用する多種燃料内燃機関であれば、本発明を適用することができる。
2・・・気筒
3・・・点火プラグ
8・・・ガソリンインジェクタ
9・・・CNGインジェクタ
10・・ガソリン用デリバリーパイプ
11・・CNG用デリバリーパイプ
15・・CNG供給通路
16・・CNGタンク
20・・ECU
27・・空燃比センサ
28・・クランク角センサ
Claims (3)
- 複数種類の燃料を混合燃焼させることで運転可能な多種燃料内燃機関の制御装置であって、
気筒内の混合気への点火を行う点火プラグと
複数種類の燃料の混合割合を制御する混合割合制御部と
複数種類の燃料の混合割合に基づいて前記点火プラグの点火時期を制御する点火時期制御部と、を備え、
要求放電電圧が前記点火プラグへの印加電圧よりも一定値低い電圧以下となるように、前記混合割合制御手段によって複数種類の燃料の混合割合を制御すると共に前記点火時期制御手段によって前記点火プラグの点火時期を制御する多種燃料内燃機関の制御装置。 - 気筒内の混合気への点火不良を検出する点火不良検出部をさらに備え、
前記点火不良検出部によって点火不良が検出された場合、前記混合割合制御手段によって複数種類の燃料の混合割合を制御すると共に前記点火時期制御手段によって前記点火プラグの点火時期を制御することで、要求放電電圧を低下させる請求項1に記載の多種燃料内燃機関の制御装置。 - 前記点火プラグの劣化度合いが所定の劣化度合い以上であるか否かを判別する劣化判別部をさらに備え、
前記劣化判別部によって前記点火プラグの劣化度合いが前記所定の劣化度合い以上であると判定された場合に、多種燃料内燃機関の運転状態が所定の高要求放電電圧領域に属する時は、前記混合割合制御手段によって複数種類の燃料の混合割合を制御すると共に前記点火時期制御手段によって前記点火プラグの点火時期を制御することで、要求放電電圧を低下させる請求項1又は2に記載の多種燃料内燃機関の制御装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180068532.3A CN103415687B (zh) | 2011-02-24 | 2011-02-24 | 多燃料内燃机的控制装置 |
US14/001,259 US9200611B2 (en) | 2011-02-24 | 2011-02-24 | Control apparatus for a multi-fuel internal combustion engine |
JP2013500790A JP5556952B2 (ja) | 2011-02-24 | 2011-02-24 | 多種燃料内燃機関の制御装置 |
BR112013021760A BR112013021760A2 (pt) | 2011-02-24 | 2011-02-24 | aparelho de controle para um motor de combustão interna de múltiplos combustíveis |
EP11859155.1A EP2679788A4 (en) | 2011-02-24 | 2011-02-24 | Control device for various types of fuel internal combustion engines |
PCT/JP2011/054196 WO2012114500A1 (ja) | 2011-02-24 | 2011-02-24 | 多種燃料内燃機関の制御装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/054196 WO2012114500A1 (ja) | 2011-02-24 | 2011-02-24 | 多種燃料内燃機関の制御装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012114500A1 true WO2012114500A1 (ja) | 2012-08-30 |
Family
ID=46720317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/054196 WO2012114500A1 (ja) | 2011-02-24 | 2011-02-24 | 多種燃料内燃機関の制御装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9200611B2 (ja) |
EP (1) | EP2679788A4 (ja) |
JP (1) | JP5556952B2 (ja) |
CN (1) | CN103415687B (ja) |
BR (1) | BR112013021760A2 (ja) |
WO (1) | WO2012114500A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016183615A (ja) * | 2015-03-26 | 2016-10-20 | 株式会社豊田自動織機 | エンジンの点火装置 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140366840A1 (en) * | 2013-06-17 | 2014-12-18 | Caterpillar Motoren GmbH & Co. KG. | Fuel Apportionment for Multi Fuel Engine System |
US10323586B1 (en) | 2017-12-20 | 2019-06-18 | Caterpillar Inc. | Dual fuel engine control strategy for limiting cylinder over-pressurization |
WO2020236154A1 (en) | 2019-05-21 | 2020-11-26 | Cummins Inc. | Variable energy ignition methods, systems, methods, and apparatuses |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007270750A (ja) | 2006-03-31 | 2007-10-18 | Toyota Central Res & Dev Lab Inc | ガス燃料内燃機関 |
JP2008121489A (ja) * | 2006-11-10 | 2008-05-29 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2009024594A (ja) * | 2007-07-19 | 2009-02-05 | Toyota Motor Corp | 点火制御装置およびこれを備えた車両制御装置 |
JP2009174354A (ja) * | 2008-01-22 | 2009-08-06 | Toyota Motor Corp | 燃料噴射装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02283860A (ja) * | 1989-04-24 | 1990-11-21 | Nissan Motor Co Ltd | エンジンの点火時期制御装置 |
US4995367A (en) * | 1990-06-29 | 1991-02-26 | Hitachi America, Ltd. | System and method of control of internal combustion engine using methane fuel mixture |
US6298825B1 (en) * | 1998-11-27 | 2001-10-09 | Fev Motorentechnik Gmbh | Method for igniting a multi-cylinder reciprocating gas engine by injecting an ignition gas |
JP4372472B2 (ja) * | 2003-08-07 | 2009-11-25 | トヨタ自動車株式会社 | 内燃機関 |
US7823562B2 (en) * | 2008-05-16 | 2010-11-02 | Woodward Governor Company | Engine fuel control system |
-
2011
- 2011-02-24 JP JP2013500790A patent/JP5556952B2/ja not_active Expired - Fee Related
- 2011-02-24 EP EP11859155.1A patent/EP2679788A4/en not_active Withdrawn
- 2011-02-24 CN CN201180068532.3A patent/CN103415687B/zh not_active Expired - Fee Related
- 2011-02-24 US US14/001,259 patent/US9200611B2/en not_active Expired - Fee Related
- 2011-02-24 WO PCT/JP2011/054196 patent/WO2012114500A1/ja active Application Filing
- 2011-02-24 BR BR112013021760A patent/BR112013021760A2/pt not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007270750A (ja) | 2006-03-31 | 2007-10-18 | Toyota Central Res & Dev Lab Inc | ガス燃料内燃機関 |
JP2008121489A (ja) * | 2006-11-10 | 2008-05-29 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2009024594A (ja) * | 2007-07-19 | 2009-02-05 | Toyota Motor Corp | 点火制御装置およびこれを備えた車両制御装置 |
JP2009174354A (ja) * | 2008-01-22 | 2009-08-06 | Toyota Motor Corp | 燃料噴射装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2679788A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016183615A (ja) * | 2015-03-26 | 2016-10-20 | 株式会社豊田自動織機 | エンジンの点火装置 |
Also Published As
Publication number | Publication date |
---|---|
BR112013021760A2 (pt) | 2016-10-18 |
US9200611B2 (en) | 2015-12-01 |
JP5556952B2 (ja) | 2014-07-23 |
CN103415687B (zh) | 2015-12-16 |
EP2679788A4 (en) | 2017-04-05 |
US20130327294A1 (en) | 2013-12-12 |
JPWO2012114500A1 (ja) | 2014-07-07 |
CN103415687A (zh) | 2013-11-27 |
EP2679788A1 (en) | 2014-01-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7077105B2 (en) | Spark ignition internal combustion engine | |
JP5569644B2 (ja) | 多種燃料内燃機関の燃料供給制御システム | |
JP6684492B2 (ja) | 二元燃料エンジンおよび制御方法 | |
CN107489556B (zh) | 内燃机的控制装置 | |
JP2006329158A (ja) | 火花点火式筒内噴射型内燃機関の制御装置 | |
JP2009114973A (ja) | 内燃機関の始動制御装置 | |
KR101542540B1 (ko) | 과급기 부착 내연 기관의 제어 장치 | |
JP5556952B2 (ja) | 多種燃料内燃機関の制御装置 | |
WO2013027276A1 (ja) | 多種燃料内燃機関の制御システム | |
JP4924580B2 (ja) | 内燃機関制御装置 | |
JP2010133367A (ja) | 筒内噴射内燃機関の燃料噴射制御装置 | |
JP2007285195A (ja) | 内燃機関の着火時期制御システム | |
JP2016130473A (ja) | 内燃機関の制御装置 | |
JP2018105191A (ja) | 内燃機関の制御装置 | |
JP2007270750A (ja) | ガス燃料内燃機関 | |
JP5728818B2 (ja) | ガス燃料エンジンの制御装置 | |
JP6169512B2 (ja) | 内燃機関の燃料供給制御装置 | |
JP4136555B2 (ja) | 内燃機関の燃料供給装置 | |
JP2011132930A (ja) | ガス燃料内燃機関の点火システム | |
JP2008064055A (ja) | 複数燃料内燃機関の燃料噴射制御装置 | |
JP2008133794A (ja) | 燃料噴射量制御装置 | |
JP2014190311A (ja) | バイフューエル内燃機関の燃料噴射制御装置 | |
JP2005201178A (ja) | 多種燃料機関 | |
JP2009174354A (ja) | 燃料噴射装置 | |
JP2016217299A (ja) | 内燃機関の制御装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11859155 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2013500790 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14001259 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1301004720 Country of ref document: TH |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011859155 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112013021760 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112013021760 Country of ref document: BR Kind code of ref document: A2 Effective date: 20130826 |