CN113803181B - Fire protection strategy for national six-natural gas engine - Google Patents

Fire protection strategy for national six-natural gas engine Download PDF

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Publication number
CN113803181B
CN113803181B CN202110899989.4A CN202110899989A CN113803181B CN 113803181 B CN113803181 B CN 113803181B CN 202110899989 A CN202110899989 A CN 202110899989A CN 113803181 B CN113803181 B CN 113803181B
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China
Prior art keywords
engine
ecu
temperature
acceleration
natural gas
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CN202110899989.4A
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Chinese (zh)
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CN113803181A (en
Inventor
邬鹏
杨葵
周维顺
曾文芳
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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Priority to CN202110899989.4A priority Critical patent/CN113803181B/en
Publication of CN113803181A publication Critical patent/CN113803181A/en
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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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/28—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • 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
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/16—Type of output information
    • B60K2360/171—Vehicle or relevant part thereof displayed

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

Abstract

The invention discloses a fire protection strategy of a national six-natural gas engine, which is realized by an ECU, a rotating speed sensor, a temperature sensor and an engine, wherein the rotating speed sensor is connected with the ECU, the rotating speed sensor is arranged on an engine crankshaft, the temperature sensor is arranged on an engine catalyst, and the control strategy of the ECU comprises the following steps: step 1, after an engine is started, an ECU (electronic control unit) detects the acceleration of crankshaft rotation through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) recognizes the acceleration as a misfire fault; step 2, the ECU switches the engine operation fuel ratio from the equivalent combustion mode to the lean combustion mode; step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalyst, and if the carrier temperature is still rising and exceeds a set level 1 temperature critical value, the engine carries out level 1 limiting power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to stop. The invention can effectively protect the engine in time after the fire.

Description

Fire protection strategy for national six-natural gas engine
Technical Field
The invention relates to the technical field of natural gas engine misfire protection control, in particular to a technical method for controlling the misfire protection of a natural gas engine.
Background
Before the national sixth technical regulation is not upgraded, the natural gas engine basically adopts a lean combustion route, and no engine misfire detection and protection measures are adopted. Natural gas engines in the market have the problems that due to various reasons such as aging of an ignition system, large difference of gas components in the market and the like, the engine is in fire, unburned natural gas enters into an exhaust tail pipe and a catalyst for combustion, and tail gas emission exceeds standard, or the catalyst is irreversibly damaged such as cracking, burning and the like.
With the upgrade implementation of the national sixth emission regulations, in order to ensure the low emission performance of the natural gas engine, the conventional lean combustion route cannot meet the requirements, and the main combustion route of the national sixth is equivalent combustion at present. The fire protection technology of the existing natural gas engine is that after a temperature sensor arranged on a catalyst measures a certain ultra-high critical temperature value, the temperature sensor is fed back to an Engine Controller (ECU), then the ECU judges that the engine fails, and then the power output of the engine is directly limited. The actual catalyst internal carrier temperature has already been severely exceeded in the normal operating temperature range from the actual engine misfire to the catalyst temperature sensor giving a temperature alarm, and the catalyst has been damaged to varying degrees. And after the power output of the engine is directly limited, the temperature of the carrier in the catalyst cannot be reduced in a short time immediately, and the protection force on the catalyst is very small.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fire protection strategy of a national six-natural gas engine, and the protection force of a catalyst is increased.
In order to achieve the aim of the invention, the fire protection strategy of the national six-natural gas engine is realized by the following technical scheme:
the fire protection strategy of the national six-natural gas engine is realized through an ECU, and a rotating speed sensor, a temperature sensor and an engine which are connected with the ECU, wherein the rotating speed sensor is arranged on an engine crankshaft, the temperature sensor is arranged on an engine catalyst, and the control strategy of the ECU comprises the following steps:
step 1, after an engine is started, an ECU (electronic control unit) detects the acceleration of crankshaft rotation through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) recognizes the acceleration as a misfire fault;
step 2, the ECU switches the engine operation fuel ratio from the equivalent combustion mode to the lean combustion mode;
step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalyst, and if the carrier temperature is still rising and exceeds a set level 1 temperature critical value, the engine carries out level 1 limiting power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to stop.
Furthermore, the ECU is also connected with a vehicle instrument panel, and a fault lamp is arranged on the vehicle instrument panel so as to prompt a driver that an engine breaks down, and the vehicle instrument panel is convenient for maintenance personnel to maintain in a targeted mode.
Further, when the internal temperature of the catalyst does not rise and does not exceed the level 1 threshold, the engine is operated in the lean burn mode until the ECU does not detect a misfire signal and the engine returns to the stoichiometric burn mode.
The invention has the beneficial effects that:
the invention can effectively protect the engine in time after the fire.
Drawings
Fig. 1 is a control logic diagram of an ECU in an embodiment of the invention.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
As shown in figure 1 of the drawings,
a fire protection strategy for a national six-natural gas engine.
When the engine is started, the ECU can detect the acceleration of crankshaft rotation through an engine crankshaft rotation speed sensor, and when a certain cylinder or a plurality of cylinders have a malignition condition and a fire accident occurs, the acceleration of the crankshaft is obviously reduced, so that an Engine Controller (ECU) can identify whether the fire accident occurs.
When the acceleration of the crankshaft is obviously reduced, the ECU judges that the engine has a fire fault. Meanwhile, by combining the rotation angle of the crankshaft, the situation of poor ignition and fire of one or more cylinders can be calculated, and engine operation information at the moment of fire occurrence and the number of cylinders in which the fire occurs can be stored in the ECU; then, a flashing fault lamp (a specific lighting mode is defined in addition) appears on the vehicle instrument panel so as to prompt a driver that the engine breaks down, and the vehicle instrument panel is convenient for maintenance personnel to carry out targeted maintenance. At the same time, the ECU switches the engine operating fuel ratio from the stoichiometric combustion mode to the lean combustion mode.
Next, the ECU determines the slope of the rise in the carrier temperature and the maximum temperature by receiving the analysis of the carrier temperature signal measured by the temperature sensor mounted on the catalyst. If the carrier temperature is still increasing and exceeds the set level 1 temperature critical value, the engine carries out level 1 limiting power output (limiting proportion is required to be calibrated through test); if the temperature continues to rise, reaching the level 2 threshold, the engine may be forced to stop.
When the internal temperature of the catalyst does not rise and does not exceed the level 1 threshold, the engine is operated in a lean burn mode until the ECU does not detect a misfire signal and the engine returns to an equivalent burn mode.
While the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims (2)

1. The fire protection strategy for the national six-natural gas engine is characterized by comprising the following steps of: the control strategy of the ECU comprises the following steps:
step 1, after an engine is started, an ECU (electronic control unit) detects the acceleration of crankshaft rotation through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) recognizes the acceleration as a misfire fault;
step 2, the ECU switches the engine operation fuel ratio from the equivalent combustion mode to the lean combustion mode;
step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalyst, and if the carrier temperature is still rising and exceeds a set level 1 temperature critical value, the engine carries out level 1 limiting power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to stop.
2. A national six natural gas engine misfire protection strategy as recited in claim 1, wherein: the ECU is also connected with a vehicle instrument panel, and a fault lamp is arranged on the vehicle instrument panel.
CN202110899989.4A 2021-08-06 2021-08-06 Fire protection strategy for national six-natural gas engine Active CN113803181B (en)

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Application Number Priority Date Filing Date Title
CN202110899989.4A CN113803181B (en) 2021-08-06 2021-08-06 Fire protection strategy for national six-natural gas engine

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Application Number Priority Date Filing Date Title
CN202110899989.4A CN113803181B (en) 2021-08-06 2021-08-06 Fire protection strategy for national six-natural gas engine

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CN113803181B true CN113803181B (en) 2023-07-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114645793B (en) * 2022-05-23 2023-06-13 四川中能西控低碳动力装备有限公司 Gas engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09151723A (en) * 1995-11-28 1997-06-10 Tokyo Gas Co Ltd Method and device for operation control of gas engine
JPH09166041A (en) * 1995-12-13 1997-06-24 Mitsubishi Motors Corp Misfire detector of internal combustion engine
KR19980035414A (en) * 1996-11-13 1998-08-05 김영귀 Misfire Detection of Vehicle Gasoline Engine
JP2000265893A (en) * 1999-03-15 2000-09-26 Fuji Heavy Ind Ltd Multiple cylinder engine
CN102116241A (en) * 2009-12-30 2011-07-06 中国第一汽车集团公司 Method for diagnosing accidental fire of gasoline engine
CN106089463A (en) * 2016-06-17 2016-11-09 南京依维柯汽车有限公司 A kind of guard method of catching fire of gasoline EMS system
WO2021084917A1 (en) * 2019-10-29 2021-05-06 株式会社ニッキ Engine misfire diagnosing/detecting method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09151723A (en) * 1995-11-28 1997-06-10 Tokyo Gas Co Ltd Method and device for operation control of gas engine
JPH09166041A (en) * 1995-12-13 1997-06-24 Mitsubishi Motors Corp Misfire detector of internal combustion engine
KR19980035414A (en) * 1996-11-13 1998-08-05 김영귀 Misfire Detection of Vehicle Gasoline Engine
JP2000265893A (en) * 1999-03-15 2000-09-26 Fuji Heavy Ind Ltd Multiple cylinder engine
CN102116241A (en) * 2009-12-30 2011-07-06 中国第一汽车集团公司 Method for diagnosing accidental fire of gasoline engine
CN106089463A (en) * 2016-06-17 2016-11-09 南京依维柯汽车有限公司 A kind of guard method of catching fire of gasoline EMS system
WO2021084917A1 (en) * 2019-10-29 2021-05-06 株式会社ニッキ Engine misfire diagnosing/detecting method

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