CN112377320B - Method for controlling initial gas temperature in cylinder during first firing cycle of engine - Google Patents

Method for controlling initial gas temperature in cylinder during first firing cycle of engine Download PDF

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Publication number
CN112377320B
CN112377320B CN202011164066.6A CN202011164066A CN112377320B CN 112377320 B CN112377320 B CN 112377320B CN 202011164066 A CN202011164066 A CN 202011164066A CN 112377320 B CN112377320 B CN 112377320B
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gasoline
engine
cylinder
temperature
control unit
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CN202011164066.6A
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CN112377320A (en
Inventor
何邦全
李晓
赵华
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Tianjin University
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Tianjin University
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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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2422—Selective use of one or more tables
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2496—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories the memory being part of a closed loop
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
    • F02D41/3076—Controlling fuel injection according to or using specific or several modes of combustion with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02P5/1506—Digital data processing using one central computing unit with particular means during starting

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

Abstract

The invention discloses a method for controlling the initial temperature of gas in a cylinder of a first firing cycle of an engine, which utilizes an engine electric control unit to control a heating process, ignites mixed gas in the cylinder by spark to heat a combustion chamber by adjusting the quality and the air quantity of gasoline sprayed into an air inlet pipe under the condition that the opening degree of a throttle valve is the same as the test requirement, calculates the temperature of residual waste gas in the cylinder and the thermal state in the combustion chamber according to a temperature sensor arranged in an exhaust passage, and automatically switches the electric control unit to an engine combustion process test control mode under the set gas temperature in the cylinder after the set temperature and the thermal state of the residual waste gas in the cylinder are reached.

Description

Method for controlling initial gas temperature in cylinder during first firing cycle of engine
Technical Field
The invention relates to the technical field of initial gas temperature control and combustion in an engine, in particular to a method for controlling the initial temperature of gas in a combustion chamber of the engine.
Background
The temperature of the gas in the cylinder before the first firing of the engine is an important factor affecting the formation and combustion of the combustible mixture. At present, most methods for controlling the temperature of the gas in the cylinder use an intake air heater, such as the disclosed patents CN110296026A and CN209129761U, etc., and the heating time of the electric heater is calculated according to the temperature of the gas in the engine gas, and the temperature of the gas in the cylinder is indirectly controlled by controlling the temperature of the air in the intake air pipe.
Temperature control using such gas heating results in a slower rise in air temperature within the combustion chamber, especially at lower ambient temperatures, where the engine needs to be run over longer engine-out conditions to achieve the desired air temperature. This not only reduces the efficiency of the engine test, but also makes it difficult to accurately control the cylinder gas temperature. Therefore, there is a strong need for an efficient and rapid in-cylinder temperature control method for the first firing cycle of an engine.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for controlling the initial temperature of gas in a cylinder of a first firing cycle of an engine.
The purpose of the invention is realized by the following technical scheme:
the method for controlling the initial temperature of gas in a first ignition cycle cylinder of an engine is based on a gasoline injection control system, wherein the gasoline injection control system comprises a gasoline tank, a gasoline pump, a gasoline rail, a crankshaft position sensor, a camshaft position sensor, an exhaust temperature sensor, an exhaust oxygen sensor and an electric control unit; the gasoline tank, the gasoline pump and the gasoline rail are used for supplying oil to the gasoline injector; the crankshaft position sensor is positioned at a crankshaft end cover and used for measuring the real-time rotating speed of the engine; the camshaft position sensor is positioned at the upper part of the air inlet camshaft and used for determining gasoline injection time and spark plug ignition time by combining signals of the crankshaft position sensor; the exhaust temperature sensor and the exhaust oxygen sensor are integrated and fixed in an engine exhaust passage and are used for measuring the real-time temperature and the air-fuel ratio of gas in an engine cylinder; the electronic control unit is used for acquiring sensor signals and controlling the gasoline pump and the gasoline injector to work; the method comprises the following steps:
step 1, setting the temperature of residual exhaust gas in a cylinder and a thermodynamic state target value and storing the residual exhaust gas and the thermodynamic state target value into a storage position of a gasoline injection control system;
step 2, starting the engine, and judging whether the temperature and thermodynamic state in the cylinder of the engine are smaller than set target values according to an exhaust temperature sensor; if yes, switching to the step 3, otherwise, switching to the step 7;
step 3, starting a heating control mode by an engine electronic control unit;
step 4, calculating the air-fuel ratio in an engine cylinder and the corresponding gasoline injection amount according to an exhaust oxygen sensor;
step 5, calculating the rotating speed of the engine according to signals of a crankshaft position sensor and a camshaft position sensor and controlling the gasoline injection time and the ignition time of a spark plug;
step 6, controlling the gasoline injection control system to be started and the spark plug to ignite by the electronic control unit according to the gasoline injection amount, the gasoline injection time and the ignition time of the spark plug obtained by calculation, and storing corresponding numerical values to a specific storage position of the electronic control unit in an MAP (MAP) mode;
and 7, switching the engine electronic control unit to a test control mode.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. when the spark plug is used for igniting gasoline in an engine cylinder, a large amount of heat is released to directly heat the combustion chamber, the heating speed is high, and the set target temperature value can be quickly reached while the engine dragging-down time is shortened.
2. The amount of gasoline injected may be controlled using a closed loop MAP-based control strategy to reduce the amount of fuel consumed during the warm-up process.
3. The method can realize the regulation and control of the target parameters without adding external facilities, thereby reducing the operation cost and being more easily accepted by users.
4. The method is simple and convenient to operate, can be quickly finished in the engine back-dragging process, and does not need to carry out additional operation.
Drawings
FIG. 1 is a schematic diagram of a gasoline injection control system configuration for the method of the present invention.
Fig. 2 is a flowchart of the control method according to the embodiment of the present invention.
Reference numerals: 1-gasoline tank, 2-gasoline pump, 3-gasoline rail, 4-gasoline injector, 5-intake pipe, 6-cylinder head, 7-camshaft position sensor, 8-intake camshaft, 9-intake valve, 10-cylinder jacket, 11-piston, 12-crank link mechanism, 13-crankshaft, 14-spark plug, 15-exhaust camshaft, 16-exhaust valve, 17-crankshaft position sensor, 18-crankshaft end cover, 19-exhaust temperature sensor, 20-exhaust oxygen sensor, 21-exhaust pipe and 22-electronic control unit.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Embodiments of the present invention will be specifically described with reference to fig. 1 to 2.
A method for rapidly controlling the initial temperature of gas in a cylinder during a first firing cycle of an engine, a gasoline injection control system comprising: the device comprises a gasoline tank 1, a gasoline pump 2, a gasoline rail 3, a crankshaft position sensor 17, a camshaft position sensor 7, an exhaust temperature sensor 19, an exhaust oxygen sensor 20 and an electronic control unit 22; the gasoline rail 3 and the gasoline injector 4 are mounted on the engine intake pipe 5, and the spark plug 14 is mounted in the engine cylinder. All the sensors, the gasoline injector 4 and the gasoline pump 2 are connected to the electronic control unit 22; the gasoline pump 2 is controlled by the electronic control unit 22 to suck gasoline from the gasoline tank 1 and deliver the gasoline to the gasoline rail 3 and the gasoline injector 4. And finally supplying gasoline with the oil supply system under 0.3 MPa. The gasoline tank 1, the gasoline pump 2 and the gasoline rail 3 are used for supplying fuel to the gasoline injector 4; a crankshaft position sensor 17 is located at the crankshaft end cap 18 for measuring the real-time rotational speed of the engine crankshaft 13; the camshaft position sensor 7 is positioned at the upper part of the air inlet camshaft 8, the air inlet camshaft 8 is positioned on the cylinder cover 6 of the engine, and the gasoline injection time and the ignition time of the spark plug 14 are determined by measuring the closing and opening times of the air inlet valve 9 and combining the signals of the crankshaft position sensor 17; an exhaust temperature sensor 19 and an exhaust oxygen sensor 20 are integrated and fixed in an engine exhaust pipe 21, and after an exhaust camshaft 15 opens an exhaust valve 16, real-time temperature and air-fuel ratio of gas exhausted from a cylinder of the engine are measured; the electronic control unit 22 is used for collecting sensor signals and controlling the gasoline pump 2 and the gasoline injector 4 to work. Gasoline is sprayed into an air inlet pipe of the engine and enters a cylinder consisting of a cylinder sleeve 10, a piston 11 and a cylinder cover 6, then a crank connecting rod mechanism 12 drives the piston 11 to move upwards in the cylinder sleeve 10, mixed gas of the gasoline and air is compressed, and finally flame with higher temperature is generated through spark ignition; after the gasoline consumption is finished, a large amount of waste gas with higher temperature is generated in the cylinder to heat the combustion chamber; and when the temperature of the gas in the cylinder reaches a set value, automatically switching to an engine combustion process test control mode.
The specific method for controlling the initial temperature of the gas in the cylinder in the first ignition cycle of the engine comprises the following steps:
step 1: setting the residual exhaust gas temperature and thermodynamic state target value in the cylinder, and storing the parameters into a specific storage position of an electronic control unit;
step 2: starting the engine, judging whether the temperature and the thermodynamic state in the engine cylinder are smaller than set target values according to an exhaust temperature sensor, if so, turning to the step 3, otherwise, turning to the step 7;
and step 3: the engine electronic control unit enters a heating control mode;
and 4, step 4: obtaining the air-fuel ratio in an engine cylinder according to an exhaust oxygen sensor, and calculating the corresponding gasoline injection amount;
and 5: calculating the rotating speed of the engine according to signals of a crankshaft position sensor and a camshaft position sensor and controlling the gasoline injection time and the ignition time of a spark plug;
step 6: according to the gasoline injection quantity, the gasoline injection time and the ignition time of the spark plug which are obtained by calculation, the electronic control unit controls the gasoline pump and the gasoline injector to be started, the spark plug ignites, and corresponding numerical values are stored in a specific storage position of the electronic control unit in an MAP mode;
and 7: the engine electric control unit is switched from a heating control mode to a starting test control mode;
and (6) ending.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (1)

1. The method for controlling the initial temperature of gas in a first ignition cycle cylinder of an engine is based on a gasoline injection control system, wherein the gasoline injection control system comprises a gasoline tank, a gasoline pump, a gasoline rail, a crankshaft position sensor, a camshaft position sensor, an exhaust temperature sensor, an exhaust oxygen sensor and an electric control unit; the gasoline tank, the gasoline pump and the gasoline rail are used for supplying oil to the gasoline injector; the crankshaft position sensor is positioned at a crankshaft end cover and used for measuring the real-time rotating speed of the engine; the camshaft position sensor is positioned at the upper part of the air inlet camshaft and used for determining gasoline injection time and spark plug ignition time by combining signals of the crankshaft position sensor; the exhaust temperature sensor and the exhaust oxygen sensor are integrated and fixed in an engine exhaust passage and are used for measuring the real-time temperature and the air-fuel ratio of gas in an engine cylinder; the electronic control unit is used for acquiring sensor signals and controlling the gasoline pump and the gasoline injector to work; the method is characterized by comprising the following steps:
step 1, setting the temperature of residual exhaust gas in a cylinder and a thermodynamic state target value and storing the residual exhaust gas and the thermodynamic state target value into a storage position of a gasoline injection control system;
step 2, starting the engine, and judging whether the temperature and thermodynamic state in the cylinder of the engine are smaller than set target values according to an exhaust temperature sensor; if yes, switching to the step 3, otherwise, switching to the step 7;
step 3, starting a heating control mode by an engine electronic control unit;
step 4, calculating the air-fuel ratio in an engine cylinder and the corresponding gasoline injection amount according to an exhaust oxygen sensor;
step 5, calculating the rotating speed of the engine according to signals of a crankshaft position sensor and a camshaft position sensor and controlling the gasoline injection time and the ignition time of a spark plug;
step 6, controlling the gasoline injection control system to be started and the spark plug to ignite by the electronic control unit according to the gasoline injection amount, the gasoline injection time and the ignition time of the spark plug obtained by calculation, and storing corresponding numerical values to a specific storage position of the electronic control unit in an MAP (MAP) mode;
and 7, switching the engine electronic control unit to a test control mode.
CN202011164066.6A 2020-10-27 2020-10-27 Method for controlling initial gas temperature in cylinder during first firing cycle of engine Active CN112377320B (en)

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CN112377320B true CN112377320B (en) 2022-03-29

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JPH10122015A (en) * 1996-10-24 1998-05-12 Mitsubishi Motors Corp Exhaust gas temperature raising device
JP2004052694A (en) * 2002-07-22 2004-02-19 Mazda Motor Corp Control device for spark-ignition engine
WO2006043679A1 (en) * 2004-10-22 2006-04-27 Toyota Jidosha Kabushiki Kaisha Device and method for stopping an engine
EP1840359A1 (en) * 2006-03-31 2007-10-03 Mazda Motor Corporation Control system for multi-cylinder four-cycle engine
JP2012107588A (en) * 2010-11-18 2012-06-07 Mitsubishi Motors Corp Control device for internal combustion engine
CN106414985A (en) * 2013-11-07 2017-02-15 艾克莫特公司 Internal combustion engine and method of direct fuel injection
CN106930812A (en) * 2015-10-01 2017-07-07 丰田自动车株式会社 The control device of internal combustion engine and the control method of internal combustion engine

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JP4447530B2 (en) * 2005-07-26 2010-04-07 トヨタ自動車株式会社 In-cylinder direct injection internal combustion engine control device
JP2007085231A (en) * 2005-09-21 2007-04-05 Toyota Motor Corp Cylinder direct injection internal combustion engine
US8950368B2 (en) * 2013-07-01 2015-02-10 John Allan Strother Internal combustion engine and working cycle
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US20150122217A1 (en) * 2013-11-07 2015-05-07 Transonic Combustion, Inc. Internal combustion engine and method of direct fuel injection
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Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2057972A1 (en) * 1970-11-25 1972-06-29 Bosch Gmbh Robert Cold start and warm-up device for internal combustion engines with external ignition
JPH10122015A (en) * 1996-10-24 1998-05-12 Mitsubishi Motors Corp Exhaust gas temperature raising device
JP2004052694A (en) * 2002-07-22 2004-02-19 Mazda Motor Corp Control device for spark-ignition engine
WO2006043679A1 (en) * 2004-10-22 2006-04-27 Toyota Jidosha Kabushiki Kaisha Device and method for stopping an engine
EP1840359A1 (en) * 2006-03-31 2007-10-03 Mazda Motor Corporation Control system for multi-cylinder four-cycle engine
JP2012107588A (en) * 2010-11-18 2012-06-07 Mitsubishi Motors Corp Control device for internal combustion engine
CN106414985A (en) * 2013-11-07 2017-02-15 艾克莫特公司 Internal combustion engine and method of direct fuel injection
CN106930812A (en) * 2015-10-01 2017-07-07 丰田自动车株式会社 The control device of internal combustion engine and the control method of internal combustion engine

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