WO2019049878A1 - エンジン制御システム - Google Patents
エンジン制御システム Download PDFInfo
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- WO2019049878A1 WO2019049878A1 PCT/JP2018/032830 JP2018032830W WO2019049878A1 WO 2019049878 A1 WO2019049878 A1 WO 2019049878A1 JP 2018032830 W JP2018032830 W JP 2018032830W WO 2019049878 A1 WO2019049878 A1 WO 2019049878A1
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- timing
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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
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—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 gaseous fuels
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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
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—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 gaseous fuels
- F02D19/026—Measuring or estimating parameters related to the fuel supply system
- F02D19/029—Determining density, viscosity, concentration or composition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—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
- F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
- F02D35/026—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures using an estimation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/028—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the combustion timing or phasing
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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
- F02D41/0027—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
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- 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
- F02P5/152—Digital data processing dependent on pinking
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- 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
- F02P23/00—Other ignition
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present disclosure relates to an engine control system that controls an engine according to the composition of fuel gas.
- Patent Document 1 discloses a technology for analyzing the composition of a fuel gas and determining the presence or absence of the possibility of occurrence of knocking based on the composition of the fuel gas and the load of the engine.
- the present disclosure aims to provide an engine control system capable of suppressing knocking while grasping the degree to knocking.
- the engine control system of this indication is based on the 1st parameter containing composition of fuel gas, and a delay estimating part which estimates self-ignition delay, and self-ignition timing based on self-ignition delay. And a control unit for controlling the engine based on the comparison result between the self-ignition timing and the combustion completion timing.
- the delay estimation unit estimates the self-ignition delay at a plurality of time points from the start of fuel injection to the self-ignition, and the self-ignition prediction unit determines the time when the integrated value of the reciprocal of the self-ignition delay becomes 1 or more. It may be predicted as the ignition timing.
- the first parameter further includes an in-cylinder variable acquisition unit that acquires in-cylinder pressure and in-cylinder temperature, and the delay estimation unit estimates self-ignition delay according to in-cylinder pressure and in-cylinder temperature at a plurality of time points. It is also good.
- the in-cylinder variable acquisition unit may estimate the in-cylinder pressure and the in-cylinder temperature based on a second parameter including the composition of the fuel gas.
- the completion prediction unit may predict the combustion completion timing based on one of the combustion speed and in-cylinder pressure of the fuel gas and the injection amount of the fuel gas.
- the control unit may change at least one of the intake temperature, the intake pressure, the fuel gas injection amount, the fuel injection timing, and the compression ratio.
- FIG. 1 is a view showing a schematic configuration of a gas engine (engine).
- FIG. 2 is a functional block diagram of an engine control system.
- FIG. 3 is a view showing an example of a change in in-cylinder pressure.
- FIG. 4A is a diagram showing an example of the calorific value due to the combustion of the fuel gas.
- FIG. 4B is a diagram showing an example of the integrated value of the calorific value due to the combustion of the fuel gas.
- FIG. 5 is a diagram for explaining the process of the operation control unit.
- FIG. 6 is a flowchart showing the flow of the engine control process.
- FIG. 1 is a view showing a schematic configuration of a gas engine 100 (engine).
- the intake port 104a, the exhaust port 104b, and the fuel injection nozzle 116 are illustrated on the same cross section. However, the intake port 104a, the exhaust port 104b, and the fuel injection nozzle 116 may not be located on the same cross section.
- the gas engine 100 includes a cylinder 102, a cylinder head 104, and a piston 106.
- the piston 106 is housed in the cylinder 102.
- a combustion chamber 108 is formed by the cylinder 102, the cylinder head 104 and the piston 106.
- An intake port 104 a and an exhaust port 104 b are formed in the cylinder head 104.
- the intake port 104 a and the exhaust port 104 b open to the combustion chamber 108.
- the intake valve 110a opens and closes an opening on the combustion chamber 108 side of the intake port 104a.
- the exhaust valve 110 b opens and closes an opening on the combustion chamber 108 side of the exhaust port 104 b.
- the intake pipe 112a is connected to the intake port 104a.
- the intake air is guided to the intake pipe 112a.
- the intake air flows into the combustion chamber 108 through the intake pipe 112 a and the intake port 104 a.
- the exhaust pipe 112b is connected to the exhaust port 104b.
- the exhaust gas discharged from the combustion chamber 108 to the exhaust port 104b is discharged to the outside through the exhaust pipe 112b.
- the fuel gas pipe 114 is connected to a fuel tank and a fuel injection nozzle 116 (not shown).
- the fuel gas pipe 114 is provided with a gas composition sensor 210 described later.
- the fuel injection nozzle 116 is provided on the cylinder head 104. The tip of the fuel injection nozzle 116 projects into the combustion chamber 108.
- the fuel injection nozzle 116 is opened and closed by a fuel valve 116a.
- the fuel gas pipe 114 is in communication with the combustion chamber 108 via the fuel injection nozzle 116. Fuel gas is introduced from the fuel tank to the fuel gas pipe 114, and when the fuel injection nozzle 116 is opened by the fuel valve 116a, the fuel gas is injected into the combustion chamber 108.
- fuel gas shall be produced by gasifying LNG (liquefied natural gas), for example.
- LNG liquefied natural gas
- the fuel gas is not limited to LNG, and for example, gas obtained by gasifying LPG (liquefied petroleum gas), light oil, heavy oil or the like can also be applied.
- LPG liquefied petroleum gas
- the gas engine 100 is, for example, a four-stroke engine.
- the intake stroke the intake valve 110a is opened and the exhaust valve 110b is closed.
- the piston 106 goes to the bottom dead center.
- the intake air flows into the combustion chamber 108 from the intake port 104a.
- the compression stroke the intake valve 110a and the exhaust valve 110b close.
- the piston 106 moves to the top dead center, and the mixture is compressed.
- Fuel is injected from the fuel injection nozzle 116 into the combustion chamber 108.
- the fuel gas air-fuel mixture
- the intake valve 110a is closed and the exhaust valve 110b is opened.
- the piston 106 goes to the top dead center. Exhaust gas after combustion is discharged from the combustion chamber 108 through the exhaust port 104 b.
- FIG. 2 is a functional block diagram of engine control system 200. As shown in FIG. 2, the engine control system 200 includes a gas composition sensor 210 and an engine control device 220.
- the gas composition sensor 210 is composed of, for example, a gas chromatography, an infrared spectroscopic sensor, and a combined sensor module including a hydrogen sensor, and measures the composition of the fuel gas flowing through the fuel gas pipe 114.
- the measurement result by the gas composition sensor 210 is output, for example, once every hour or so.
- the composition of the fuel gas is indicated, for example, as a content ratio of each component.
- the engine control device 220 is configured of, for example, an ECU (Engine Control Unit).
- the engine control device 220 includes a central processing unit (CPU), a ROM storing programs and the like, a RAM as a work area, and the like, and controls the entire gas engine 100. Further, the engine control device 220 functions as an in-cylinder variable acquisition unit 230, a delay estimation unit 232, a self-ignition prediction unit 234, a completion prediction unit 236, and an operation control unit 238.
- the in-cylinder variable acquisition unit 230 acquires the pressure in the cylinder 102 (in-cylinder pressure) and the temperature in the cylinder 102 (in-cylinder temperature). Specifically, the in-cylinder variable acquisition unit 230 derives the in-cylinder pressure and the in-cylinder temperature based on the in-cylinder acquisition parameter (second parameter).
- the in-cylinder acquisition parameters include the operating conditions (intake temperature, intake pressure, fuel gas injection amount (air-fuel mixture concentration), fuel injection timing, compression ratio) of the gas engine 100, and the composition of the fuel gas. However, at least the composition of the fuel gas may be included as the in-cylinder acquisition parameter.
- the intake air temperature and the intake pressure may be, for example, values measured by a temperature sensor or a pressure sensor.
- the intake air temperature and the intake air pressure may be, for example, estimated values estimated based on operating conditions of a supercharger (compressor) that compresses intake air and a cooler that cools intake air.
- the response surface of the combustion rate is stored in advance.
- the response surface of the burning rate is a burning velocity of the fuel gas associated with a plurality of parameters including the pressure in the cylinder, the temperature in the cylinder, the composition of the fuel gas, and the injection amount (mixture concentration) of the fuel gas.
- the composition of the fuel gas for example, patterns of combinations of content ratios of the respective components are registered in advance, and the closest pattern is identified based on the measured composition of the fuel gas.
- the response surface of the burning rate may be, for example, a plurality of map types or a functional model.
- the in-cylinder variable acquisition unit 230 derives (estimates) the combustion velocity of the fuel gas from the response surface of the combustion velocity and the in-cylinder acquisition parameter. Then, the in-cylinder variable acquisition unit 230 derives the in-cylinder pressure and the in-cylinder temperature based on the burning rate of the fuel gas and the operating condition of the gas engine 100.
- FIG. 3 is a view showing an example of a change in in-cylinder pressure.
- the in-cylinder variable acquisition unit 230 derives the in-cylinder pressure and the in-cylinder temperature at a plurality of time points in a predetermined period.
- the predetermined period is, for example, a period after closing the intake valve 110a and the exhaust valve 110b until the exhaust valve 110b is opened beyond the top dead center (TDC).
- the intervals between the plurality of time points are, for example, 0.1 degree in crank angle.
- the above-described intake pressure and intake temperature are set as initial values of the in-cylinder pressure and the in-cylinder temperature before compression, respectively.
- the in-cylinder pressure and the in-cylinder temperature after compression are derived using the set compression ratio.
- the combustion speed is derived from the derived in-cylinder acquisition parameter including the in-cylinder pressure and the in-cylinder temperature at the time of ignition, and the response surface of the combustion rate.
- the combustion amount of the fuel to be burned by the next time of ignition is derived by the derived combustion speed
- the in-cylinder pressure of the next time of ignition is derived from the amount of combustion.
- the in-cylinder temperature is derived from the derived in-cylinder pressure and combustion amount (heat generation amount).
- the combustion speed at the next time of ignition is derived from the in-cylinder acquisition parameter including the in-cylinder pressure and the in-cylinder temperature, and the response surface of the combustion speed.
- the in-cylinder variable acquisition unit 230 derives the in-cylinder pressure and the in-cylinder temperature transition (in-cylinder pressure history, in-cylinder temperature history) according to the crank angle.
- the delay estimation unit 232 estimates the self-ignition delay based on the delay parameter (first parameter).
- the delay parameters include in-cylinder pressure, in-cylinder temperature, fuel gas injection amount (mixture concentration), and composition of the fuel gas.
- the self-ignition delay is the time from the start of fuel injection to self-ignition.
- the response surface of the self-ignition delay is stored in advance.
- the response surface of the self-ignition delay is obtained by associating the self-ignition delay with a plurality of parameters including the in-cylinder pressure, the in-cylinder temperature, the composition of the fuel gas, and the injection amount (mixture concentration of fuel gas) of the fuel gas.
- the composition of the fuel gas as described above, for example, patterns of combinations of content ratios of the respective components are registered in advance, and the closest pattern is identified based on the measured composition of the fuel gas.
- the response surface of the self-ignition delay may be, for example, a plurality of map types or a functional model.
- the delay estimation unit 232 derives (estimates) the self-ignition delay based on the response surface of the self-ignition delay and the delay parameter.
- the in-cylinder variable acquisition unit 230 derives the transition of the in-cylinder pressure and the in-cylinder temperature according to the crank angle.
- the delay estimation unit 232 derives the self-ignition delay at a plurality of time points (crank angles) using the in-cylinder pressure and the in-cylinder temperature at that time.
- the self-ignition prediction unit 234 sequentially integrates the reciprocals of the self-ignition delay derived by the delay estimation unit 232 in time series.
- the self-ignition prediction unit 234 predicts, as the self-ignition timing, a time when the integrated value becomes 1 or more.
- Such predictive calculation of the self-ignition timing by integration of the reciprocal of the self-ignition delay is said to be Livengood-Wu integral, and is represented by the following Equation 1. ... (Equation 1)
- time is variable t
- auto ignition timing is variable te
- auto ignition delay is variable ⁇
- in-cylinder pressure is variable P
- in-cylinder temperature is variable T.
- the completion prediction unit 236 predicts the combustion completion timing of the fuel gas at which the fuel gas supplied to the combustion chamber 108 burns off. Specifically, the completion prediction unit 236 predicts the combustion completion timing based on the combustion speed of the fuel gas and the injection amount of the fuel gas.
- the completion prediction unit 236 estimates the distribution (volume) of the mixture of the fuel gas and the intake air in the combustion chamber 108 based on the injection amount of the fuel gas and the in-cylinder pressure. The completion prediction unit 236 estimates, based on the burning rate of the fuel gas, the time when the burning portion reaches the entire mixture, and uses this as the burning completion timing of the fuel gas.
- the completion prediction unit 236 may predict the combustion completion timing based on the in-cylinder pressure and the injection amount of the fuel gas.
- FIG. 4A is a diagram showing an example of the calorific value due to the combustion of the fuel gas.
- FIG. 4B is a diagram showing an example of the integrated value of the calorific value due to the combustion of the fuel gas.
- the calorific value can be estimated based on the energy balance of the gas inside the cylinder 102.
- the completion prediction unit 236 derives the calorific value associated with the combustion of the fuel gas every hour based on the in-cylinder pressure and the in-cylinder temperature.
- the completion prediction unit 236 integrates the amount of heat generation associated with the combustion of the fuel gas every hour (integrated heat generation amount).
- the completion prediction unit 236 sets the time when the integrated heating value exceeds the threshold as the combustion completion timing.
- the threshold value is set to, for example, 95% of the total amount of calorific value generated when all the injected fuel gas burns.
- the completion prediction unit 236 may predict the combustion completion timing based on the in-cylinder pressure and the injection amount of the fuel gas.
- the operation control unit 238 compares the self-ignition timing predicted by the self-ignition prediction unit 234 with the combustion completion timing predicted by the completion prediction unit 236.
- the operation control unit 238 controls the gas engine 100 based on the comparison result.
- the operation control unit 238 changes the operating conditions of the gas engine 100.
- the operation control unit 238 changes, for example, the intake temperature, the intake pressure, the fuel gas injection amount (air-fuel mixture concentration), the fuel injection timing, and the compression ratio described above as the operation conditions. Specifically, the operation control unit 238 may control the cooler to change the intake air temperature. The operation control unit 238 may control the supercharger (compressor) to change the intake pressure. The operation control unit 238 may change the open / close timing of the fuel valve 116 a to change the injection amount of fuel gas or the fuel injection timing, or change the ignition timing. The operation control unit 238 may change the open / close timing of the intake valve 110a and the exhaust valve 110b by a variable valve mechanism.
- the self-ignition timing is after the combustion completion timing, it is estimated that knocking does not occur. If the self-ignition timing is earlier than the combustion completion timing, it is estimated that knocking occurs.
- the operation control unit 238 changes the operation condition to improve the efficiency of the gas engine 100 within a range where knocking does not occur according to the time difference between the self-ignition timing and the combustion completion timing.
- the self-ignition timing is earlier than the combustion completion timing, and the time difference between the self-ignition timing and the combustion completion timing is large. In this case, it is estimated that knocking can not be avoided unless the operating conditions are largely relaxed (to the direction in which knocking hardly occurs). Conversely, it is assumed that the time difference between the self-ignition timing and the combustion completion timing is small. In this case, it is presumed that knocking can be avoided without reducing the operating conditions so much (to the extent that knocking is less likely to occur).
- the operation control unit 238 changes the operating condition to a direction in which knocking is less likely to occur, while suppressing the decrease in the efficiency of the gas engine 100 according to the time difference between the self-ignition timing and the combustion completion timing.
- FIG. 5 is a diagram for explaining the process of the operation control unit 238.
- the operation control unit 238 performs efficiency improvement control if the self-ignition timing is after the combustion completion timing.
- the operation control unit 238 performs knocking suppression control if the self-ignition timing is earlier than the combustion completion timing.
- the margin degree to the operating condition at which knocking occurs is derived as the time difference between the self-ignition timing and the combustion completion timing.
- the operating conditions are controlled according to this time difference. Therefore, even though there is room for improving the efficiency of the gas engine 100, it is possible to avoid a situation where the operating conditions are not changed. It becomes possible to suppress knocking while grasping the degree to knocking.
- FIG. 6 is a flowchart showing the flow of the engine control process. The process shown in FIG. 6 is repeatedly executed at predetermined intervals.
- Step 300 The in-cylinder variable acquisition unit 230 and the delay estimation unit 232 acquire the measurement result of the (latest) fuel gas composition that was last measured by the gas composition sensor 210.
- the in-cylinder variable acquisition unit 230 includes in-cylinder acquisition parameters (operation conditions of the gas engine 100 (intake temperature, intake pressure, fuel gas injection amount (air-fuel mixture concentration), fuel injection timing, compression ratio) and fuel gas).
- the in-cylinder pressure and the in-cylinder temperature are derived based on the composition).
- the delay estimation unit 232 estimates the self-ignition delay based on the delay parameters (in-cylinder pressure, in-cylinder temperature, fuel gas injection amount (air-fuel mixture concentration), and fuel gas composition).
- Step 306 The self-ignition prediction unit 234 sequentially integrates, in time series, the reciprocal of the self-ignition delay derived by the delay estimation unit 232, and predicts, as the self-ignition timing, a time when the integrated value becomes 1 or more.
- Step 308 The completion prediction unit 236 predicts the combustion completion timing based on one of the combustion speed and in-cylinder pressure of the fuel gas and the injection amount of the fuel gas.
- Step 310) The operation control unit 238 compares the self-ignition timing predicted by the self-ignition prediction unit 234 with the combustion completion timing predicted by the completion prediction unit 236. The operation control unit 238 determines whether the self-ignition timing is earlier than the combustion completion timing. If the self-ignition timing is earlier than the combustion completion timing, the process proceeds to step 312, and if the self-ignition timing is after the combustion completion timing, the process proceeds to step 314.
- Step 312 The operation control unit 238 performs knocking suppression control, and ends the engine control process.
- Step 314 The operation control unit 238 performs the efficiency improvement control, and ends the engine control process.
- the gas engine 100 has been described as a four-stroke engine.
- the gas engine 100 may be a two-stroke engine.
- the gas engine 100 may be a uniflow scavenged two-stroke engine.
- the in-cylinder variable acquisition unit 230 derives (acquires) the in-cylinder pressure and the in-cylinder temperature by calculation.
- knocking can be predicted before knocking occurs.
- the cylinder 102 may be provided with a pressure sensor and a temperature sensor.
- the in-cylinder variable acquisition unit 230 acquires, as the in-cylinder pressure and the in-cylinder temperature, output values acquired from the pressure sensor and the temperature sensor, respectively.
- the value of the previous cycle can be used to predict knocking in the cycle of interest.
- the point at which the measured in-cylinder pressure peaks can be used as the combustion completion timing.
- the present disclosure can be utilized in an engine control system that controls an engine according to the composition of fuel gas.
- gas engine (engine) 200 engine control system 230: in-cylinder variable acquisition unit 232: delay estimation unit 234: self-ignition prediction unit 236: completion prediction unit 238: operation control unit (control unit)
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- General Engineering & Computer Science (AREA)
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- Combined Controls Of Internal Combustion Engines (AREA)
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Abstract
Description
筒内変数取得部230および遅れ推定部232は、ガス組成センサ210が最後に測定した(最新の)燃料ガスの組成の測定結果を取得する。
筒内変数取得部230は、筒内取得用パラメータ(ガスエンジン100の運転条件(吸気温度、吸気圧力、燃料ガスの噴射量(混合気濃度)、燃料噴射タイミング、圧縮比)と、燃料ガスの組成)に基づいて、筒内圧力および筒内温度を導出する。
遅れ推定部232は、遅れパラメータ(筒内圧力、筒内温度、燃料ガスの噴射量(混合気濃度)、および、燃料ガスの組成)に基づいて自着火遅れを推定する。
自着火予測部234は、遅れ推定部232が導出した自着火遅れの逆数を、時系列に順次、積算し、積算値が1以上となる時点を、自着火タイミングとして予測する。
完了予測部236は、燃料ガスの燃焼速度および筒内圧力の一方と、燃料ガスの噴射量に基づいて、燃焼完了タイミングを予測する。
運転制御部238は、自着火予測部234によって予測された自着火タイミングと、完了予測部236によって予測された燃焼完了タイミングとを比較する。運転制御部238は、自着火タイミングの方が、燃焼完了タイミングよりも早いか否かを判定する。自着火タイミングの方が、燃焼完了タイミングよりも早い場合、ステップ312に処理を移し、自着火タイミングが、燃焼完了タイミング以降の場合、ステップ314に処理を移す。
運転制御部238は、ノッキング抑制制御を遂行し、当該エンジン制御処理を終了する。
運転制御部238は、効率向上制御を遂行し、当該エンジン制御処理を終了する。
Claims (6)
- 燃料ガスの組成を含む第1パラメータに基づいて、自着火遅れを推定する遅れ推定部と、
前記自着火遅れに基づいて、自着火タイミングを予測する自着火予測部と、
前記燃料ガスの燃焼完了タイミングを予測する完了予測部と、
前記自着火タイミングと前記燃焼完了タイミングとの比較結果に基づいて、エンジンを制御する制御部と、
を備えるエンジン制御システム。 - 前記遅れ推定部は、燃料噴射開始から自着火までの間の複数の時点について、前記自着火遅れを推定し、
前記自着火予測部は、前記自着火遅れの逆数の積算値が1以上となる時点を、前記自着火タイミングと予測する請求項1に記載のエンジン制御システム。 - 前記第1パラメータとして、筒内圧力、筒内温度を取得する筒内変数取得部をさらに備え、
前記遅れ推定部は、前記複数の時点における前記筒内圧力、前記筒内温度に応じた前記自着火遅れを推定する請求項2に記載のエンジン制御システム。 - 前記筒内変数取得部は、前記燃料ガスの組成を含む第2パラメータに基づいて、前記筒内圧力、前記筒内温度を推定する請求項3に記載のエンジン制御システム。
- 前記完了予測部は、前記燃料ガスの燃焼速度および前記筒内圧力の一方と、前記燃料ガスの噴射量とに基づいて、前記燃焼完了タイミングを予測する請求項1から4のいずれか1項に記載のエンジン制御システム。
- 前記制御部は、吸気温度、吸気圧力、前記燃料ガスの噴射量、燃料噴射タイミング、圧縮比の少なくとも一つを変更する請求項1から5のいずれか1項に記載のエンジン制御システム。
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