CN113803181A - 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
CN113803181A
CN113803181A CN202110899989.4A CN202110899989A CN113803181A CN 113803181 A CN113803181 A CN 113803181A CN 202110899989 A CN202110899989 A CN 202110899989A CN 113803181 A CN113803181 A CN 113803181A
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CN
China
Prior art keywords
engine
ecu
temperature
crankshaft
speed sensor
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110899989.4A
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Chinese (zh)
Other versions
CN113803181B (en
Inventor
邬鹏
杨葵
周维顺
曾文芳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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
Application granted granted Critical
Publication of CN113803181B publication Critical patent/CN113803181B/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 for a national six natural gas engine, which is realized by an ECU (electronic control Unit), 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 a crankshaft of the engine, the temperature sensor is arranged on a catalyst of the engine, and the control strategy of the ECU comprises the following steps: step 1, after an engine is started, an ECU detects the rotation acceleration of a crankshaft through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) identifies a misfire fault according to the rotation acceleration; step 2, the ECU switches the running fuel ratio of the engine from an equivalent combustion mode to a lean combustion mode; step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalytic converter, and if the carrier temperature is still increased and exceeds a set 1-level temperature critical value, the engine carries out 1-level limited power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to a stop. The invention can timely and effectively protect the engine after the fire occurs.

Description

Fire protection strategy for national six natural gas engine
Technical Field
The invention relates to the technical field of fire protection control of natural gas engines, in particular to a fire protection control technical method of a natural gas engine.
Background
Before the national six technical regulations are not upgraded, the natural gas engine basically adopts a lean combustion route and does not adopt engine fire detection and protection measures. In a natural gas engine in the market, 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 catching, unburned natural gas enters an exhaust tail pipe and a catalytic converter to be combusted, and the exhaust emission exceeds the standard, or the catalytic converter is cracked and burnt and irreversibly damaged.
With the upgrading implementation of the national six-emission regulation, the traditional lean combustion route cannot meet the requirements for ensuring the low-emission performance of the natural gas engine, and the current national six main combustion route is equivalent combustion. In the existing fire protection technology of the natural gas engine, after a temperature sensor arranged on a catalyst measures a certain ultrahigh critical temperature value, the ultrahigh critical temperature value is fed back to an Engine Controller (ECU), and then the ECU judges that the engine breaks down and directly limits the power output of the engine. From the actual occurrence of fire of an engine to the emission of a temperature alarm by a catalyst temperature sensor, the actual temperature of the internal carrier of the catalyst is already seriously beyond the normal working temperature range, and the catalyst is damaged in different degrees. And after the power output of the engine is directly limited, the temperature of the carrier in the catalyst cannot be immediately reduced in a short time, and the protection force on the catalyst is very little.
Disclosure of Invention
In order to solve the technical problem, the invention provides a fire protection strategy for a national six-natural-gas engine, and the protection strength of a catalyst is enhanced.
In order to achieve the aim, the fire protection strategy of the national six natural gas engine is realized by the following technical scheme:
the utility model provides a six natural gas engine of state protection strategy that catches fire, realizes through ECU and the rotational speed sensor, the temperature sensor, the engine of connecting ECU, and rotational speed sensor sets up in engine crankshaft, and temperature sensor sets up in the engine catalyst converter, ECU's control strategy contains following step:
step 1, after an engine is started, an ECU detects the rotation acceleration of a crankshaft through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) identifies a misfire fault according to the rotation acceleration;
step 2, the ECU switches the running fuel ratio of the engine from an equivalent combustion mode to a lean combustion mode;
step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalytic converter, and if the carrier temperature is still increased and exceeds a set 1-level temperature critical value, the engine carries out 1-level limited power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to a stop.
Furthermore, the ECU is also connected with a vehicle instrument panel, and a fault lamp is arranged on the vehicle instrument panel to prompt a driver that the engine has a fault, so that the maintenance personnel can conveniently and pertinently overhaul the engine.
Further, when the internal temperature of the catalyst is not increased 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 is returned to the equivalent burn mode.
The invention has the beneficial effects that:
the invention can timely and effectively protect the engine after the fire occurs.
Drawings
Fig. 1 is a control logic diagram of an ECU in the embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
As shown in figure 1 of the drawings, in which,
a fire protection strategy for a national six natural gas engine.
After the engine is started, the ECU can detect the rotation acceleration of the crankshaft through a crankshaft rotation speed sensor of the engine, when the conditions of poor ignition and fire catching of one cylinder or multiple cylinders occur, the crankshaft acceleration is obviously reduced, and an Engine Controller (ECU) identifies whether the fire catching fault occurs or not.
When the acceleration of the crankshaft is obviously reduced, the ECU judges that the engine has a misfire fault. Meanwhile, the conditions of poor ignition and fire catching of the cylinders or multiple cylinders can be calculated by combining the rotation angle of the crankshaft, and the running information of the engine at the moment of fire catching and the number of cylinders in which the fire catching occur are stored in the ECU; then, a flashing fault lamp (the lighting mode is defined in addition) can appear on the instrument panel of the vehicle so as to prompt a driver that the engine has a fault and bring convenience for maintenance personnel to carry out targeted maintenance. Meanwhile, the ECU switches the engine operation fuel ratio from the equivalent combustion mode to the lean combustion mode.
Next, the ECU determines the slope of the rise in the temperature of the carrier and the maximum temperature by receiving the signal of the carrier temperature measured by analyzing the temperature sensor mounted on the catalyst. If the temperature of the carrier is still increased sharply and exceeds the set grade 1 temperature critical value, the engine carries out grade 1 power limiting output (the limiting proportion needs to be calibrated in a test way); if the temperature continues to rise, reaching the level 2 threshold, the engine may be forced to a stop.
When the internal temperature of the catalyst is not increased and does not exceed the level 1 threshold, the engine is operated in a lean burn mode until the ECU detects no misfire signal and the engine returns to the equivalent burn mode.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (2)

1. The utility model provides a fire protection strategy of national six natural gas engine which characterized in that: the method is realized by an ECU (electronic control Unit), a rotating speed sensor, a temperature sensor and an engine, wherein the rotating speed sensor, the temperature sensor and the engine are connected with the ECU, the rotating speed sensor is arranged on a crankshaft of the engine, the temperature sensor is arranged on a catalyst of the engine, and a control strategy of the ECU comprises the following steps:
step 1, after an engine is started, an ECU detects the rotation acceleration of a crankshaft through an engine crankshaft rotation speed sensor, and when the acceleration of the crankshaft is reduced by more than 10%, an Engine Controller (ECU) identifies a misfire fault according to the rotation acceleration;
step 2, the ECU switches the running fuel ratio of the engine from an equivalent combustion mode to a lean combustion mode;
step 3, the ECU receives a carrier temperature signal measured by a temperature sensor arranged on the catalytic converter, and if the carrier temperature is still increased and exceeds a set 1-level temperature critical value, the engine carries out 1-level limited power output; if the temperature continues to rise, reaching the level 2 threshold, the engine is forced to a stop.
2. The 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)

Priority Applications (1)

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

Applications Claiming Priority (1)

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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CN113803181A true CN113803181A (en) 2021-12-17
CN113803181B CN113803181B (en) 2023-07-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114645793A (en) * 2022-05-23 2022-06-21 四川中能西控低碳动力装备有限公司 Fuel 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114645793A (en) * 2022-05-23 2022-06-21 四川中能西控低碳动力装备有限公司 Fuel engine

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