WO2016159019A1 - Appareil d'estimation de gaz d'échappement - Google Patents

Appareil d'estimation de gaz d'échappement Download PDF

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Publication number
WO2016159019A1
WO2016159019A1 PCT/JP2016/060266 JP2016060266W WO2016159019A1 WO 2016159019 A1 WO2016159019 A1 WO 2016159019A1 JP 2016060266 W JP2016060266 W JP 2016060266W WO 2016159019 A1 WO2016159019 A1 WO 2016159019A1
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WO
WIPO (PCT)
Prior art keywords
nox concentration
concentration value
exhaust gas
internal combustion
combustion engine
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Application number
PCT/JP2016/060266
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English (en)
Japanese (ja)
Inventor
良文 花村
佐藤　淳一
ヒューナーズ ホルガー
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いすゞ自動車株式会社
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Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2016159019A1 publication Critical patent/WO2016159019A1/fr

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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

Definitions

  • the present invention relates to an exhaust gas estimation device, and more particularly to an estimation device for a nitrogen compound concentration (hereinafter referred to as engine exhaust NOx concentration) in exhaust gas discharged from an internal combustion engine.
  • engine exhaust NOx concentration a nitrogen compound concentration
  • the engine exhaust NOx concentration is generally detected by a NOx sensor provided in the exhaust passage upstream of the NOx catalyst. Further, in order to detect the NOx purification rate of the NOx catalyst, it is necessary to provide NOx sensors on the upstream side and the downstream side of the NOx catalyst, respectively.
  • the NOx sensor has a problem that the NOx concentration cannot be sensed for a predetermined period from the start of the engine to the completion of warm-up.
  • NOx sensors are provided upstream and downstream of the NOx catalyst in order to detect the NOx purification rate of the NOx catalyst, there is a problem that the cost increases due to an increase in the number of sensors.
  • the engine exhaust NOx concentration is estimated based on a map that is referred to based on the engine speed and the fuel injection amount, or a model formula that includes the engine speed and the fuel injection amount as input values. .
  • the estimation accuracy cannot be sufficiently ensured by the method of estimating based only on the engine speed and the fuel injection amount. There are challenges.
  • the exhaust gas estimation device of the present disclosure aims to effectively improve the estimation accuracy of the engine exhaust NOx concentration.
  • An exhaust gas estimation device is an exhaust gas estimation device that estimates NOx concentration in exhaust gas discharged from an internal combustion engine, and is based on the rotational speed and fuel injection amount of the internal combustion engine.
  • a reference NOx concentration value calculating means for calculating a reference NOx concentration value in the exhaust gas discharged, and a predetermined first correction value set based on the fuel injection timing of the internal combustion engine is multiplied by the reference NOx concentration value.
  • an estimated NOx concentration value calculating means for calculating an estimated NOx concentration value in the exhaust gas discharged from the internal combustion engine.
  • the exhaust gas estimation device further includes common rail pressure detection means for detecting a pressure of a common rail that supplies pressure-accumulated fuel to an injector of the internal combustion engine, and the estimated NOx concentration value calculation means sets the common rail to the reference NOx concentration value.
  • the estimated NOx concentration value may be calculated by further multiplying a predetermined second correction value set from the common rail pressure detected by the pressure detecting means.
  • the exhaust gas estimation device further includes a cooling water temperature detecting means for detecting a cooling water temperature flowing through the cooling water circulation path of the internal combustion engine, and the estimated NOx concentration value calculating means sets the cooling water temperature detecting means to the reference NOx concentration value.
  • the estimated NOx concentration value may be calculated by further multiplying a predetermined third correction value set from the cooling water temperature detected by the above.
  • An exhaust gas estimation device is an exhaust gas estimation device that estimates the NOx concentration in exhaust gas discharged from an internal combustion engine, and detects the pressure of a common rail that supplies accumulated pressure fuel to an injector of the internal combustion engine.
  • Common rail pressure detecting means reference NOx concentration value calculating means for calculating a reference NOx concentration value in exhaust gas discharged from the internal combustion engine based on the rotational speed and fuel injection amount of the internal combustion engine, and the common rail pressure
  • An estimated NOx concentration value for calculating an estimated NOx concentration value in the exhaust gas discharged from the internal combustion engine by multiplying the reference NOx concentration value by a predetermined second correction value set from the common rail pressure detected by the detecting means.
  • Value calculating means is an exhaust gas estimation device that estimates the NOx concentration in exhaust gas discharged from an internal combustion engine, and detects the pressure of a common rail that supplies accumulated pressure fuel to an injector of the internal combustion engine.
  • the exhaust gas estimation device of the present disclosure is an exhaust gas estimation device that estimates the NOx concentration in the exhaust gas discharged from the internal combustion engine, and detects the coolant temperature that flows through the coolant circulation path of the internal combustion engine.
  • a detecting means a reference NOx concentration value calculating means for calculating a reference NOx concentration value in exhaust gas discharged from the internal combustion engine based on the rotational speed of the internal combustion engine and a fuel injection amount; and the cooling water temperature detecting means.
  • Estimated NOx concentration value calculating means for calculating an estimated NOx concentration value in the exhaust gas discharged from the internal combustion engine by multiplying the reference NOx concentration value by a predetermined third correction value set from the detected coolant temperature. And comprising.
  • the exhaust gas estimation device further includes oxygen concentration acquisition means for acquiring an oxygen concentration in a cylinder of the internal combustion engine, and the estimated NOx concentration value calculation means acquires the reference NOx concentration value by the oxygen concentration acquisition means.
  • the estimated NOx concentration value may be calculated by further multiplying a predetermined fourth correction value set from the oxygen concentration to be set.
  • the exhaust gas estimation device further includes intake air temperature acquisition means for acquiring the intake air temperature sucked into the cylinder of the internal combustion engine, and the estimated NOx concentration value calculation means sets the intake NOx concentration value to the reference NOx concentration value.
  • the estimated NOx concentration value may be calculated by further multiplying a predetermined fifth correction value set from the intake air temperature acquired by the air temperature acquisition means.
  • the exhaust gas estimation device of the present disclosure it is possible to effectively improve the estimation accuracy of the engine exhaust NOx concentration.
  • FIG. 1 is a schematic overall configuration diagram showing an intake / exhaust system of an engine to which an exhaust gas estimation device according to an embodiment of the present disclosure is applied.
  • FIG. 2 is a functional block diagram illustrating an exhaust gas estimation device according to an embodiment of the present disclosure.
  • FIG. 1 shows an overall configuration diagram of a diesel engine (hereinafter simply referred to as an engine) 10 to which the exhaust gas estimation device of the present embodiment is applied.
  • Each cylinder of the engine 10 is provided with an in-cylinder injector 12 that directly injects the high-pressure fuel pressurized by a fuel pump (not shown) and accumulated in the common rail 11 into each cylinder.
  • the fuel injection amount and injection timing of the in-cylinder injector 12 are controlled by an electronic control unit (hereinafter referred to as ECU) 50.
  • the common rail 11 is provided with a common rail pressure sensor 40 capable of detecting a common rail pressure corresponding to the fuel injection pressure.
  • the common rail pressure detected by the common rail pressure sensor 40 is input to the electrically connected ECU 50.
  • An intake passage 13 is connected to the intake manifold 10A of the engine 10, and an exhaust passage 20 is connected to the exhaust manifold 10B.
  • an air cleaner 14 In the intake passage 13, an air cleaner 14, a MAF (Mass Air Flow) sensor 41, a compressor 15 ⁇ / b> A of the supercharger 15, an intercooler 16, an intake air temperature sensor 46, and the like are provided in order from the intake upstream side.
  • the intake air amount detected by the MAF sensor 41 and the intake air temperature detected by the intake air temperature sensor 46 are respectively input to the electrically connected ECU 50.
  • a turbine 15 ⁇ / b> B of the supercharger 15 In the exhaust passage 20, a turbine 15 ⁇ / b> B of the supercharger 15, an exhaust aftertreatment device (not shown), and the like are provided in order from the exhaust upstream side.
  • An exhaust gas recirculation (EGR) device 30 includes an EGR passage 31 that circulates part of the exhaust gas to the intake system, an EGR cooler 32 that cools EGR gas, and an EGR valve 33 that adjusts the EGR gas flow rate. It has.
  • An EGR gas temperature sensor 42 that detects the temperature of the EGR gas cooled by the EGR cooler 32 is provided in the EGR passage 31 on the downstream side of the EGR cooler 32. The EGR gas temperature detected by the EGR gas temperature sensor 42 is input to the electrically connected ECU 50.
  • the engine speed sensor 43 detects the speed Ne of a crankshaft (not shown) of the engine 10.
  • the accelerator opening sensor 44 detects an accelerator pedal depression amount corresponding to the fuel injection amount Q of the in-cylinder injector 12.
  • the cooling water temperature sensor 45 detects the temperature T clnt of the cooling water flowing through the engine cooling water circulation path 35, only a part of which is shown in FIG. The sensor values of these sensors 43 to 45 are respectively input to the electrically connected ECU 50.
  • the ECU 50 performs various controls of the engine 10 and includes a known CPU, ROM, RAM, input port, output port, and the like. Further, as shown in FIG. 2, the ECU 50 includes a reference NOx concentration value calculation unit 51 and an estimated NOx concentration value calculation unit 52 as some functional elements. In the present embodiment, each of these functional elements is described as being included in the ECU 50 that is integral hardware, but any one of these functional elements may be provided in separate hardware.
  • the reference NOx concentration value calculation unit 51 calculates a reference NOx concentration value NOx ref in the exhaust gas exhausted from the engine 10 based on the operating state of the engine 10. More specifically, in the memory of the ECU 50, a reference NOx concentration value map M1 that is referenced based on the engine speed Ne and the fuel injection amount Q is stored in advance. The reference NOx concentration value calculation unit 51 calculates a reference NOx concentration value NOx ref by reading values corresponding to the sensor values of the engine speed sensor 43 and the accelerator opening sensor 44 from the reference NOx concentration value map M1.
  • the estimated NOx concentration value calculation unit 52 adds the oxygen concentration correction value A, the fuel injection timing correction value B, the common rail pressure correction value C, and the cooling water temperature correction to the reference NOx concentration value NOx ref input from the reference NOx concentration value calculation unit 51.
  • the estimated NOx concentration value NOx ENG_out in the exhaust gas discharged from the engine 10 is calculated based on the following formula (1) that multiplies the value D and the cylinder intake air temperature correction value E.
  • O2 cyl is the current in-cylinder oxygen concentration
  • O2 cyl_ref is the reference in-cylinder oxygen concentration under standard atmospheric pressure conditions
  • ⁇ O2 is the oxygen concentration correction index
  • e is the base of natural logarithm
  • ⁇ soi is the current Fuel injection timing
  • ⁇ soi_ref is a reference fuel injection timing under standard atmospheric pressure conditions
  • ⁇ soi is a fuel injection timing correction coefficient
  • P rail is a current common rail pressure
  • P rail_ref is a reference common rail pressure under standard atmospheric pressure conditions
  • ⁇ rail is the common rail pressure correction coefficient
  • T clnt is the current cooling water temperature
  • T clnt_ref is the reference cooling water temperature under standard atmospheric pressure conditions
  • ⁇ clnt is the cooling water temperature correction coefficient
  • T inm is the current intake air temperature in the intake manifold 10A (hereinafter referred to as “in air intake manifold 10A” , that the cylinder intake air temperature), T inm
  • the oxygen concentration correction value A is the fourth correction value of the present disclosure.
  • the oxygen concentration correction value A is obtained by dividing the current in-cylinder oxygen concentration O2 cyl by the reference in-cylinder oxygen concentration O2 cyl_ref. It is calculated by raising the correction index ⁇ O2 to the power.
  • the current in-cylinder oxygen concentration O2 cyl is estimated based on the intake air amount, EGR gas amount, and the like input from various sensors.
  • the reference in-cylinder oxygen concentration O2 cyl_ref is read from a reference oxygen concentration map M2 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the oxygen concentration correction index ⁇ O2 is read from an oxygen concentration correction index map M3 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the reference oxygen concentration map M2 and the oxygen concentration correction index map M3 are stored in advance in the memory of the ECU 50.
  • the fuel injection timing correction value B is a first correction value of the present disclosure, and as shown in Formula (1), the fuel injection timing correction is performed by subtracting the reference fuel injection timing ⁇ soi_ref from the current fuel injection timing ⁇ soi. It is calculated by raising the base e of the natural logarithm by the value multiplied by the coefficient ⁇ soi .
  • the current fuel injection timing ⁇ soi is read from the value indicated to the in-cylinder injector 12.
  • the reference fuel injection timing ⁇ soi_ref is read from a reference injection timing map M4 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the fuel injection timing correction coefficient ⁇ soi is read from an injection timing correction coefficient map M5 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the reference injection timing map M4 and the injection timing correction coefficient map M5 are stored in advance in the memory of the ECU 50.
  • Common rail pressure correction value C is the second correction value of the present disclosure, as shown in Equation (1), the common rail pressure correction coefficient beta rail to a value obtained by subtracting the reference rail pressure P Rail_ref the current common rail pressure P rail It is calculated by riding.
  • the current common rail pressure P rail is read from the sensor value of the common rail pressure sensor 40.
  • the reference common rail pressure P rail_ref is read from a reference common rail pressure map M6 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the common rail pressure correction coefficient ⁇ rail is read from the common rail pressure correction coefficient map M7 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the reference common rail pressure map M6 and the common rail pressure correction coefficient map M7 are stored in advance in the memory of the ECU 50.
  • the cooling water temperature correction value D is a third correction value of the present disclosure, and as shown in Formula (1), the cooling water temperature correction coefficient ⁇ clnt is obtained by subtracting the reference cooling water temperature T clnt_ref from the current cooling water temperature T clnt. It is calculated by riding.
  • the current coolant temperature T clnt is read from the sensor value of the coolant temperature sensor 45.
  • the reference cooling water temperature T clnt_ref is read from a reference cooling water temperature map M8 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the coolant temperature correction coefficient ⁇ clnt is read from the coolant temperature correction coefficient map M9 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the reference cooling water temperature map M8 and the cooling water temperature correction coefficient map M9 are stored in advance in the memory of the ECU 50.
  • the in-cylinder intake air temperature correction value E is the fifth correction value of the present disclosure.
  • the current in-cylinder intake air temperature T inm is divided by the reference in-cylinder intake air temperature T inm_ref . This value is calculated by raising the in-cylinder intake air temperature correction index ⁇ inm to the power.
  • the current in-cylinder intake air temperature T inm is estimated based on the intake air temperature, EGR gas temperature, and the like input from various sensors.
  • the reference in-cylinder intake air temperature T inm_ref is read from a reference in-cylinder intake air temperature map M10 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the in-cylinder intake air temperature correction index ⁇ inm is read from the in-cylinder intake air temperature correction index map M11 that is referred to based on the engine speed Ne and the fuel injection amount Q.
  • the reference in-cylinder intake air temperature map M10 and the in-cylinder intake air temperature correction index map M11 are stored in advance in the memory of the ECU 50.
  • the exhaust gas estimation device of the present embodiment is set to the reference NOx concentration value NOx ref estimated based on the engine speed Ne and the fuel injection amount Q according to changes in the atmospheric pressure environment.
  • the estimated NOx concentration value NOx is obtained by multiplying the correction values of the oxygen concentration correction value A, fuel injection timing correction value B, common rail pressure correction value C, cooling water temperature correction value D, and cylinder intake air temperature correction value E. It is configured to calculate ENG_out .
  • the NOx concentration in the exhaust gas discharged from the engine 10 can be estimated with high accuracy without being affected by changes in the atmospheric pressure environment.
  • the engine 10 is not limited to a diesel engine, but can be applied to other engines such as a gasoline engine.
  • the exhaust purification unit of the present disclosure is useful in that the estimation accuracy of the engine exhaust NOx concentration can be effectively improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un appareil d'estimation de gaz d'échappement qui estime la concentration de NOx dans les gaz d'échappement expulsés d'un moteur à combustion interne (10). L'appareil d'estimation de gaz d'échappement est pourvu : d'une unité de calcul de valeur de concentration de NOx de référence (51) qui calcule une valeur de concentration de NOx de référence dans les gaz d'échappement expulsés du moteur à combustion interne (10) sur la base d'une quantité d'injection de carburant (Q) et d'une vitesse de rotation (Ne) du moteur à combustion interne (10); d'une unité de calcul de valeur de concentration de NOx estimée qui calcule une valeur de concentration de NOx estimée dans les gaz d'échappement expulsés du moteur à combustion interne (10) par la multiplication de la concentration de NOx de référence par une première valeur de correction prédéterminée, établie en fonction de la synchronisation d'injection de carburant du moteur à combustion interne (10).
PCT/JP2016/060266 2015-03-30 2016-03-29 Appareil d'estimation de gaz d'échappement WO2016159019A1 (fr)

Applications Claiming Priority (2)

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JP2015-070100 2015-03-30
JP2015070100A JP2016191308A (ja) 2015-03-30 2015-03-30 排気ガス推定装置

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WO2016159019A1 true WO2016159019A1 (fr) 2016-10-06

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JP7342483B2 (ja) * 2019-07-22 2023-09-12 三浦工業株式会社 送風装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05312109A (ja) * 1992-05-11 1993-11-22 Nissan Motor Co Ltd ディーゼル機関の排気制御装置
JPH06299895A (ja) * 1993-04-16 1994-10-25 Toyota Motor Corp ディーゼル機関の燃料噴射制御装置
JPH1144245A (ja) * 1997-07-30 1999-02-16 Nissan Motor Co Ltd 筒内直接噴射式火花点火エンジンの排気浄化装置
JP2002195071A (ja) * 2000-12-25 2002-07-10 Mitsubishi Electric Corp 内燃機関制御装置
JP2004019629A (ja) * 2002-06-20 2004-01-22 Toyota Motor Corp 内燃機関の制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05312109A (ja) * 1992-05-11 1993-11-22 Nissan Motor Co Ltd ディーゼル機関の排気制御装置
JPH06299895A (ja) * 1993-04-16 1994-10-25 Toyota Motor Corp ディーゼル機関の燃料噴射制御装置
JPH1144245A (ja) * 1997-07-30 1999-02-16 Nissan Motor Co Ltd 筒内直接噴射式火花点火エンジンの排気浄化装置
JP2002195071A (ja) * 2000-12-25 2002-07-10 Mitsubishi Electric Corp 内燃機関制御装置
JP2004019629A (ja) * 2002-06-20 2004-01-22 Toyota Motor Corp 内燃機関の制御装置

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