CN107420208A - Gaseous fuel system system - Google Patents

Gaseous fuel system system Download PDF

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Publication number
CN107420208A
CN107420208A CN201710369720.9A CN201710369720A CN107420208A CN 107420208 A CN107420208 A CN 107420208A CN 201710369720 A CN201710369720 A CN 201710369720A CN 107420208 A CN107420208 A CN 107420208A
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CN
China
Prior art keywords
fuel
cng
engine
air
liquid fuel
Prior art date
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.)
Withdrawn
Application number
CN201710369720.9A
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Chinese (zh)
Inventor
山中翔太
中谷文人
岩仓隆彦
菱田雄司
永田秀昭
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.)
Aisan Industry Co Ltd
Denso Ten Ltd
Fujitsu Ltd
Original Assignee
Aisan Industry Co Ltd
Fujitsu Ltd
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Application filed by Aisan Industry Co Ltd, Fujitsu Ltd filed Critical Aisan Industry Co Ltd
Publication of CN107420208A publication Critical patent/CN107420208A/en
Withdrawn legal-status Critical Current

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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
    • F02D41/24—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
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • F02D41/2445—Methods of calibrating or learning characterised by the learning conditions characterised by a plurality of learning conditions or ranges
    • 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
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F02D19/0615—Switch-over from one fuel to another being initiated by automatic means, e.g. based on engine or vehicle operating conditions
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/066—Retrofit of secondary fuel supply systems; Conversion of engines to operate on multiple fuels
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2454—Learning of the air-fuel ratio control
    • 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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • 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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • 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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0814—Oxygen storage amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/11—After-sales modification devices designed to be used to modify an engine afterwards
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A kind of gaseous fuel system system, the attached installation CNG systems system after to gasoline system engine system and in the state of constituting dual fuel engine system, the air-fuel ratio for suppressing CNG when switching to CNG to operate from gasoline operating deviates, and prevents discharge, driving from deteriorating.Attached installation possesses CNG system, devices and secondary ECU (51) CNG systems system to possessing after the gasoline system engine system of engine (1), gasoline system, device and main electronic-controlled installation (main ECU) (50), the dual fuel engine system for thus forming switching gasoline and CNG use to operate.Main ECU (50) performs the study control of gasoline air-fuel ratio, by the control of the gasoline air fuel ratio learning value obtained by the control reflection to gasoline operating.Secondary ECU (51) mutually independently performs the study control of CNG air-fuel ratios with gasoline air-fuel ratio study control, by the control of the CNG air fuel ratio learning values obtained by the control reflection to CNG operatings.

Description

Gaseous fuel system system
Technical field
The present invention relates to a kind of optionally using gaseous fuel and liquid fuel come the dual fuel engine that is operated System (bi-fuel engine system), in detail, being related to one kind, the engine system is then attached to be installed in order to form Liquid fuel system engine system is come the gaseous fuel system system that is used.
Background technology
In the past, as this technology, such as the engine control system described in known following patent document 1.This is System possesses the main electronic-controlled installation (main ECU) for the control for carrying out the operating using liquid fuels such as gasoline and utilized The secondary ECU of the control of the operating of the gaseous fuels such as CNG.Here, from CKP, air inlet pressure sensor, enter temperature Spend sensor, air throttle jaw opening sensor, coolant temperature sensor and lambda sensor and input various signals to main ECU.Then, Main ECU performs the air-fuel ratio feedback control related to liquid fuel based on the output signal of lambda sensor, and it is anti-to calculate this Correction coefficient needed for feedback control, is learnt using the correction coefficient as the air fuel ratio learning value of liquid fuel.Thus, prevent The deterioration of emission relevant with liquid fuel of engine is stopped.On the other hand, letter is inputted from CKP to secondary ECU Number, and various signals from other sensors etc. are inputted to secondary ECU via main ECU.Then, secondary ECU is in order to perform feedback Control, fired using the air fuel ratio learning value for the liquid fuel for learning to obtain by main ECU, and based on the learning value to learn gas The air fuel ratio learning value of material, and air-fuel ratio feedback control is arrived into the air fuel ratio learning value reflection of the gaseous fuel.Thus, it is therefore prevented that The deterioration of emission relevant with gaseous fuel of engine.
Patent document 1：Japanese Unexamined Patent Publication 2012-36795 publications
The content of the invention
Problems to be solved by the invention
In addition, in the system described in patent document 1, cause in change year in year out due to liquid fuel system, device etc. In the case that the air-fuel ratio of engine produces deviation, the air-fuel ratio is deviateed reflection and learnt to the air-fuel ratio of liquid fuel by main ECU Value.On the other hand, in secondary ECU, the liquid fuel in main ECU is make use of in order to calculate the air fuel ratio learning value of gaseous fuel Air fuel ratio learning value, therefore situations below be present：Even if gaseous fuel system, device is not produced caused by change etc. year in year out Air-fuel ratio deviates, and the change of the air fuel ratio learning value of liquid fuel is also reflected in the air fuel ratio learning value of gaseous fuel.Cause , following worry be present in this：In engine from the case that the operating using liquid fuel is switched to using the operating of gaseous fuel, The air fuel ratio learning value of gaseous fuel deviates from true value, by performing the air-fuel ratio feedback control related to gaseous fuel, gas The air-fuel ratio of fuel deviates from true value.As a result, deterioration of emission, the driving of the operating using gaseous fuel of engine be present The worry of deterioration.
The present invention is to complete in view of the foregoing, and its object is to provide a kind of following gaseous fuel system system：It is right Attached installation gaseous fuel system's system after liquid fuel system engine system and in the state of constituting dual fuel engine system, should Gaseous fuel system system can be in engine from suppressing when switching to the operating using gaseous fuel using the operating of liquid fuel The air-fuel ratio of gaseous fuel deviates, so as to prevent deterioration of emission, the driving of the operating using gaseous fuel of engine Deteriorate.
The solution used to solve the problem
In order to achieve the above object, the described invention of the first invention is a kind of gaseous fuel system system, to liquid fuel It is that attached installation gaseous fuel system system is come combined with the liquid fuel system engine system after engine system, thus forms Use to liquid fuel and gaseous fuel is switched over to control the dual fuel engine system of the operating of engine, wherein, The liquid fuel system engine system possesses：Engine；Liquid fuel system, device, it is relevant with the operating of engine；Operate shape State detection unit, it is used for the operating condition for detecting engine；And main control unit, it is used for single based on operating condition detection The testing result of member, the operating using liquid fuel of engine, main control unit structure are controlled using liquid fuel system, device The liquid fuel air-fuel ratio related to liquid fuel system, device is performed as the testing result based on operating condition detection unit Study control, and the liquid fuel air fuel ratio learning value obtained by the control is reflected to the control for arriving the operating using liquid fuel In system, the objective of the gaseous fuel system system is possess：Gaseous fuel system, device, it is relevant with the operating of engine；And Secondary control unit, it is used for the operating using gaseous fuel that engine is controlled using gaseous fuel system, device, sub-control list Member is configured to：The testing result of operating condition detection unit is individually entered, based on the testing result, with liquid fuel air-fuel ratio Study control mutually independently performs the gaseous fuel air-fuel ratio study control related to gaseous fuel system, device, and will pass through the control The gaseous fuel air fuel ratio learning value reflection being made is into the control using the operating of gaseous fuel.
According to the structure of foregoing invention, in the state of dual fuel engine system is constituted, main control unit uses liquid Fluid fuel system, device controls the operating using liquid fuel of engine, the testing result based on operating condition detection unit come Perform the liquid fuel air-fuel ratio study control related to liquid fuel system, device, and the liquid fuel that will be obtained by the control Air fuel ratio learning value reflection is into the control using the operating of liquid fuel.On the other hand, secondary control unit uses gaseous fuel System, device controls the operating using gaseous fuel of engine, is individually entered the testing result of operating condition detection unit, The gas related with gaseous fuel system, device is mutually independently performed to learn control to liquid fuel air-fuel ratio based on the testing result The study control of fluid fuel air-fuel ratio, and the gaseous fuel air fuel ratio learning value obtained by the control reflection is arrived and fired using gas In the control of the operating of material.Thus, even if switching to the operating using gaseous fuel, liquid combustion from the operating using liquid fuel Material air fuel ratio learning value will not also reflect in the control using the operating of gaseous fuel.
In order to achieve the above object, the objective of the described invention of the second invention is, in the described hair of the first invention In bright, liquid fuel system, device includes air throttle, and the air throttle is used to adjust the air inflow for being drawn into engine, operating condition inspection Surveying unit includes：Lambda sensor, it is used to detect the oxygen concentration in the exhaust of engine；And air throttle sensor, it is used for The aperture of air throttle is detected, main control unit performs the study control of liquid fuel air-fuel ratio using the detection signal of lambda sensor System, secondary control unit perform the study control of gaseous fuel air-fuel ratio using the detection signal of air throttle sensor.
According to the structure of foregoing invention, in addition to the effect of the described invention of the first invention, main control unit utilizes The detection signal of lambda sensor controls to perform the study of liquid fuel air-fuel ratio, and on the other hand, secondary control unit utilizes solar term The detection signal of valve sensor controls to perform the study of gaseous fuel air-fuel ratio.Thus, without in order to perform gaseous fuel air-fuel Lambda sensor is used than study control, in attached installation secondary control unit after to liquid fuel system engine system, without inciting somebody to action Need to take the lambda sensor of noise counter plan to be connected to secondary control unit wiring.
In order to achieve the above object, the objective of the described invention of the 3rd invention is, in the first invention or the second invention In described invention, liquid fuel system, device includes liquid fuel feed unit, and the liquid fuel feed unit is used for hair Motivation supplies liquid fuel, and main control unit is configured to the supply for the liquid fuel that control is carried out by liquid fuel feed unit, Gaseous fuel system, device includes：Gaseous fuel feed unit, it is used for engine gaseous fuelled；And mode switch, The pattern is opened in order to switch the liquid fuel mode using liquid fuel and the gaseous fuel pattern using gaseous fuel Put capable operation into, main control unit, liquid fuel feed unit, gaseous fuel feed unit and mode switch are connected to secondary control Unit processed, in the case where mode switch is switched to liquid fuel mode, it is configured to：Will be by main control via secondary control unit The signal output related to the control of liquid fuel of unit generation is switched to liquid fuel feed unit in mode switch In the case of gaseous fuel pattern, it is configured to：The control phase with liquid fuel that secondary control unit will export from main control unit The signal correction of pass for gaseous fuel signal after be output to gaseous fuel feed unit.
According to the structure of foregoing invention, in addition to the effect of the invention described in the first invention or the second invention, master control Unit, liquid fuel feed unit, gaseous fuel feed unit and mode switch processed are connected to secondary control unit.Moreover, In the case that mode switch is switched to liquid fuel mode, via secondary control unit by generated by main control unit and liquid Fuel controls related signal output to liquid fuel feed unit.In addition, it is switched to gaseous fuel mould in mode switch In the case of formula, it is by the related signal correction that controls to liquid fuel exported from main control unit by secondary control unit Gaseous fuel feed unit is output to after the signal of gaseous fuel.Thus, without in order in main control unit and sub-control list The signal related to the control of liquid fuel is shared in member and produces the wiring from main control unit to liquid fuel feed unit Branch estranged.In addition, liquid fuel feed unit, gaseous fuel feed unit and mode switch are intensively connected to sub-control list This first part.
In order to achieve the above object, the objective of the described invention of the 4th invention is, in the first invention to the 3rd invention In any invention described in invention in, secondary control unit diagnoses gaseous fuel system based on gaseous fuel air fuel ratio learning value The exception of equipment, it is being judged as depositing in an exceptional case, is being switched to from the operating using gaseous fuel and utilize liquid fuel Operating.
According to the structure of foregoing invention, except the work of the invention described in any invention in the first invention to the 3rd invention With in addition, deposited in an exceptional case in gaseous fuel system, device, switch to from the operating using gaseous fuel and fired using liquid The operating of material, therefore when being operated using gaseous fuel there is exception in gaseous fuel system, device, can also make to start The operating of machine continues.
The effect of invention
According to the described invention of the first invention, the system of attached installation gaseous fuel system after to liquid fuel system engine system In the state of uniting and constituting dual fuel engine system, switched in engine from the operating using liquid fuel and utilize gas During the operating of fuel, the deviation of the air-fuel ratio of gaseous fuel can be suppressed, so as to prevent the utilization gaseous fuel of engine The deterioration of emission of operating, driving deteriorates.
According to the described invention of the second invention, in addition to the described The effect of invention of the first invention, additionally it is possible to press down Noise at lambda sensor processed produces, so as to ensure the precision of liquid fuel air-fuel ratio study control.
The invention described according to the 3rd invention, except the The effect of invention described in the first invention or the second invention with Outside, in attached installation gaseous fuel system's system after to liquid fuel system engine system, secondary control unit can be used for The distributor electrically connected with liquid fuel feed unit, without setting distributor in addition, so as to realize gaseous fuel system The simplification of the rear attached installation wiring of system.
According to the involved invention of the 4th invention, except the hair described in any invention in the first invention to the 3rd invention Beyond bright effect, additionally it is possible to avoid generation and the engine of the undesirable condition of the operating using gaseous fuel of engine It is unexpected to stop.
Brief description of the drawings
Fig. 1 is the Sketch for representing the dual fuel engine system for being equipped on automobile involved by an embodiment Figure.
Fig. 2 is the block diagram for the electrical structure for representing the dual fuel engine system involved by an embodiment.
Fig. 3 is the flow chart for the content for representing the gasoline injection amount control involved by an embodiment.
Fig. 4 is the flow chart for the content for representing the CNG emitted doses control involved by an embodiment.
Fig. 5 is the flow chart for the content for representing the CNG air-fuel ratios study control involved by an embodiment.
Fig. 6 is in order to according to the relation calculating between solar term valve opening and engine speed involved by an embodiment Engine load and the load mapping graph of reference.
Description of reference numerals
1：Engine；2：Intake channel；4：Exhaust channel；8：Catalytic converter；11：Air cleaner；12：Electronic throttle Device；21：Gas supply device (liquid fuel feed unit)；22：Petrol injector；23：Fuel tank；24：Gasoline line；25： Petrol pump；26：Delivery pipe；31：CNG feedways (gaseous fuel feed unit)；32：CNG injectors；33：CNG air accumulators； 34：CNG pipelines；35：Main valve；36：Stop valve；37：CNG adjusters；38：Delivery pipe；41：Air throttle sensor (operating condition Detection unit)；42：Lambda sensor (operating condition detection unit)；43：Speed probe (operating condition detection unit)；44：Water Temperature sensor (operating condition detection unit)；45：Vehicle speed sensor (operating condition detection unit)；50：Main ECU (main control lists Member)；51：Secondary ECU (secondary control unit)；52：First coupled switch；53：Second coupled switch；61：First CNG pressure sensings Device；62：2nd CNG pressure sensors；63：CNG temperature sensors；66：Mode switch；67：Pattern lamp.
Embodiment
Below, an embodiment party for embodying the gaseous fuel system system in the present invention is described in detail with reference to the attached drawings Formula.
The dual fuel engine system for being equipped on automobile in the present embodiment is shown in Fig. 1 by sketch structure figure. The engine 1 of multi cylinder makes the combustion mixture of the fuel and air supplied by intake channel 2 quick-fried in the combustion chamber of each cylinder 3 Fried, burning, and its exhaust gas after burning is discharged to the outside via exhaust channel 4.Thus, engine 1 carries out piston 5 Act rotate bent axle 6, so as to obtain power.
Intake channel 2 possesses air cleaner 11, electronic throttle device 12 and inlet manifold successively from its entrance side (manifold)13.Air cleaner 11 cleans to the air for being inhaled into intake channel 2.The convection current of electronic throttle device 12 Cross after intake channel 2 and be inhaled into air capacity (air inflow) Ga of each cylinder 3 and be adjusted.In electronic throttle device 12, lead to Cross motor 14 and driving is opened and closed to air throttle 15.The air throttle sensor 41 for being arranged at electronic throttle device 12 detects solar term Aperture (solar term valve opening) TA of valve 15, and export electric signal corresponding with its detected value.Inlet manifold 13 will flow through air inlet and lead to The air inlet on road 2 is assigned to each cylinder 3.
Dual fuel engine system in present embodiment is configured to supply the switching of engine 1 in the gasoline as fuel Engine 1 is operated with compressed natural gas (CNG).The fuel supply system 20 of the system possesses the gasoline of supply gasoline Feedway 21 and the CNG feedways 31 for supplying CNG.For gasoline equivalent to one of the liquid fuel of the present invention, CNG is suitable In one of the gaseous fuel of the present invention.Gas supply device 21 possesses the multiple gasoline being arranged in correspondence with each cylinder 3 and sprayed Device 22 and fuel tank 23 from gasoline to each petrol injector 22, gasoline line 24, petrol pump 25 and delivery pipe 26 for supplying.Vapour Oil ejector 22 employ near each cylinder 3 of engine 1 with each cylinder 3 accordingly entering to the injected petrol of air intake duct 7 Gas-duct jetting formula and multi-point injection (MPI) mode.The store gasoline in fuel tank 23.Petrol pump 25 pressurizes gasoline from fuel tank 23 It is transported to gasoline line 24.The gasoline for being pressed and delivered to gasoline line 24 is fed into each petrol injector via delivery pipe 26 22.Each cylinder 3 is fed into after each air intake duct 7 is injected into by controlling each injector 22, the gasoline supplied.Including these One of the gas supply device 21 of equipment 22~26 equivalent to the liquid fuel feed unit of the present invention.
CNG feedways 31 possess a CNG injector 32 and the CNG gas storage for supplying CNG to the injector 32 Tank 33 and CNG pipelines 34.CNG injectors 32 employ in the position of each cylinder 3 away from engine 1 to inlet manifold 13 Spray CNG single point injection (SPI) mode.Main valve 35, stop valve 36 and CNG adjusters 37 are provided with CNG pipelines 34.Always Valve 35 in order to control from CNG air accumulators 33 to the CNG of CNG pipelines 34 supplies and CNG supplies from cutting off and the magnetic valve structure of opening and closing Into.Stop valve 36 for the magnetic valve for controlling CNG flowing and being opened and closed by forming.CNG adjusters 37 will add to CNG injectors 32 The CNG of pressure conveying is adjusted to authorized pressure.By controlling CNG injectors 32, supplied from CNG air accumulators 33 by CNG pipelines 34 CNG to CNG injectors 32 is injected into inlet manifold 13, then is fed into each cylinder 3 via each air intake duct 7.Including these One of the CNG feedways 31 of equipment 32~38 equivalent to the gaseous fuel feed unit of the present invention.
The first of the pressure of the CNG for detecting the position is provided with than the CNG pipelines 34 downstream of main valve 35 CNG pressure sensors 61.Delivery pipe 38 is provided with CNG pipelines 34 between CNG adjusters 37 and CNG injectors 32. The 2nd CNG pressure sensors 62 of the pressure for detecting the CNG at the pipe 38 are provided with the delivery pipe 38 and for examining The CNG temperature sensors 63 of the CNG surveyed at the pipe 38 temperature.In the case where main valve 35 and stop valve 36 are opened, from CNG air accumulators 33 supply CNG via the grade of CNG pipelines 34 to CNG injectors 32.On the other hand, in main valve 35 or the quilt of stop valve 36 In the case of closure, the supply to the CNG of CNG injectors 32 is cut off.
It is arranged in correspondence with receiving the height electricity from the output of ignition coil 17 in multiple spark plugs 16 of engine 1 with each cylinder 3 Press to carry out firing action.The ignition timing of each spark plug 16 at the time of 17 output HIGH voltage of ignition coil by determining.
The catalytic converter 8 for being arranged at exhaust channel 4 purifies to the exhaust that exhaust channel 4 is discharged to from engine 1. The lambda sensor 42 for being arranged at exhaust channel 4 detects the oxygen concentration Ox being discharged to from engine 1 in the exhaust of exhaust channel 4, and Output electric signal corresponding with its detected value.
Be arranged at engine 1 speed probe 43 detect bent axle 6 rotating speed, i.e. engine speed NE, and output and its The corresponding electric signal of detected value.The cooling-water temperature sensor 44 for being arranged at engine 1 detects cooling water in the internal flow of engine 1 Temperature (cooling water temperature) THW, and export corresponding with its detected value electric signal.Its car is detected in addition, being provided with automobile Speed and the vehicle speed sensor 45 for exporting electric signal corresponding with its detected value.
In the present embodiment, intake channel 2, exhaust channel 4, catalytic converter 8, air cleaner 11, electronic throttle Device 12 and gas supply device 21 form gasoline system, device, equivalent to one of the liquid fuel system, device of the present invention.Separately Outside, one of various sensors 41~45 equivalent to the operating condition detection unit of the present invention.
In the present embodiment, in order to control engine 1, it is provided with main electronic-controlled installation (main ECU) 50 and secondary ECU 51.Main ECU 50 is transfused to the various signals from the output of various sensors 41~45.Secondary ECU51 is transfused to from various sensors 41 The various signals that cooling-water temperature sensor 44, air throttle sensor 41 and vehicle speed sensor 45 in~45 export.That is, secondary ECU 51 Upper not connected speed probe 43 and lambda sensor 42.Here, various signals, the i.e. basis that main ECU 50 is inputted based on these The operating condition of engine 1, the motor 14 of each petrol injector 22, ignition coil 17 and electronic throttle device 12 is carried out Control, to perform emitted dose control, ignition timing control etc. and electronic throttle control etc..On the other hand, secondary ECU 51 is based on The signal inputted, each CNG injectors 32, ignition coil 17, main valve 35 and stop valve 36 are controlled, to perform injection Amount correction, ignition timing correction and CNG relevant controls etc..Main ECU 50 equivalent to one of main control unit of the present invention, One of secondary ECU 51 equivalent to the secondary control unit of the present invention.
Here, emitted dose control refer to main ECU 50 according to the operating condition of engine 1 come control petrol injector 22, by This control gasoline injection amount.Ignition timing control refers to that main ECU 50 controls ignition coil according to the operating condition of engine 1 17th, the period that thus control is lighted a fire gasoline by each spark plug 16.Electronic throttle control refers to main ECU 50 according to air throttle Aperture TA come control motor 14, thus control air throttle 15 aperture.On the other hand, emitted dose correction refers to the bases of secondary ECU 51 Controlled in main ECU 50 emitted dose to correct emitted dose and control CNG injectors 32, be thus corrected control to CNG emitted doses System.Ignition timing correction refers to that ignition timings of the secondary ECU 51 based on main ECU 50 is controlled to correct ignition timing and control igniting Coil 17, control thus is corrected to CNG ignition timing.CNG relevant controls refer to that secondary ECU 51 is based on coming from the first CNG Pressure sensor 61 and the 2nd CNG pressure sensors 62, the signal of CNG temperature sensors 63 control main valve 35 and stop valve 36th, CNG supply is thus controlled.
In the present embodiment, main ECU 50 and secondary ECU 51 possess including central processing unit (CPU), read-only storage (ROM), random access memory (RAM) and backup RAM etc. known structure.ROM be previously stored with it is foregoing various Control related defined control program.Main ECU 50 performs foregoing various controls etc. according to these control programs.In addition, Main ECU 50 with secondary ECU 51 by being connected, to perform the emitted dose control of the main ECU 50 gasoline systems to be performed by secondary ECU 51 System and ignition timing control.In addition, secondary ECU 51 is transfused to from main ECU 50 outputs and emitted dose control and ignition timing control Make related signal and utilize these signals, thus perform the emitted dose correction and ignition timing correction of CNG systems.
In addition, mode switch 66 is provided with the driver's seat of automobile, in order to which the operating of engine 1 is switched to only Use the gasoline mode (one of liquid fuel mode of the invention) of gasoline and the CNG patterns (gas of the invention using only CNG Fluid fuel pattern) and operate the mode switch 66.Similarly, pattern lamp 67 is provided with driver's seat, the pattern lamp 67 is used for It is gasoline mode or CNG patterns to show current operating.Mode switch 66 and pattern lamp 67 are connected to secondary ECU 51.It is logical Cross the display that secondary ECU 51 carrys out control model lamp 67.In the present embodiment, CNG feedways 31, various sensors 61~63, Mode switch 66 and pattern lamp 67 form CNG system, devices, equivalent to one of the gaseous fuel system, device of the present invention.
The dual fuel engine system of present embodiment is by attached peace after the gasoline system engine system to based on Dress CNG system alternately carrys out engine system that is combined with gasoline system engine system and forming.Moreover, opened in pattern In the case that pass 66 is switched to gasoline mode, the engine system is utilized using the gasoline system engine system of script The operating of gasoline.On the other hand, in the case where mode switch 66 is switched to CNG patterns, the engine system is by gasoline system A part for engine system uses to carry out the operating using CNG in the lump with CNG system.In the present embodiment, by starting Machine 1, above-mentioned gasoline system, device and main ECU 50 form gasoline system engine system (liquid fuel system engine of the invention One of system).In addition, CNG system (gaseous fuel system of the invention is formed by above-mentioned CNG system, devices and secondary ECU 51 One of system).
The electrical structure of the dual fuel engine system of present embodiment is shown in Fig. 2 by block diagram.Main ECU 50 has Standby " air inlet measurement ", " emitted dose control ", " ignition timing control ", " air inflow correction ", " VVT (changeable air valve timing) control System ", " electronic throttle control ", " EGR controls ", " control of adsorption tanks purging ", " failure safe (fail-safe) " and " OBD The various control programs of (on-board diagnosis, OBD) ".On the other hand, secondary ECU 51 possess gasoline mode and " switching control " of CNG patterns, " emitted dose correction ", " ignition timing correction ", " CNG relevant controls ", " failure safe " and The various control programs of " OBD ".In addition, secondary ECU 51 includes the first coupled switch 52 that connection is switched by switching control With the second coupled switch 53.Moreover, main ECU 50 is connected with secondary ECU 51 via the first main wiring 71 and the second main wiring 72. That is, the first main wiring 71 is defeated via the first coupled switch 52 by the signal related to " emitted dose control " exported from main ECU 50 Enter to secondary ECU 51.In addition, the second main wiring 72 passes through the signal related to " ignition timing control " exported from main ECU 50 Secondary ECU 51 is input to by the second coupled switch 53.In addition, by making electric wiring (harness) branch by various sensors 41~45 are connected in parallel in main ECU 50 and secondary ECU 51.Here, only it is connected with except lambda sensor 42 and turns on secondary ECU 51 Cooling-water temperature sensor 44, air throttle sensor 41 and vehicle speed sensor 45 beyond fast sensor 43.In addition, connect on secondary ECU 51 It is connected to petrol injector 22, CNG injectors 32, ignition coil 17 and CNG associated components 35,36,61~63,66,67.
Moreover, by being switched over by secondary ECU 51 the first coupled switch 52, main ECU 50 with " emitted dose control " Related signal is output to petrol injector 22 or after secondary ECU 51 " emitted dose correction " via secondary ECU 51 It is output to CNG injectors 32.In addition, by being switched over by secondary ECU 51 the second coupled switch 53, main ECU 50 with " ignition timing control " related signal is output to ignition coil 17 via secondary ECU 51 or by secondary ECU's 51 Ignition coil 17 is output to after " ignition timing correction ".
Then, the gasoline injection amount for illustrating to be performed by main ECU 50 controls.Shown in Fig. 3 by flow chart in its control Hold.
When processing is transferred to the routine, in step 100, main ECU 50 reads in various letters from various sensors 41~45 Number.
Then, in step 110, main ECU 50 calculates the basic emitted dose TAUGB of gasoline.Main ECU50 can be based on hair Motivation rotating speed NE and solar term valve opening TA calculates basic emitted dose TAUGB.
Then, in the step 120, main ECU 50 calculates the various corrected value KCG of high temperature correction etc..Main ECU 50 for example can Various corrected value KCG are enough calculated based on cooling water temperature THW.
Then, in step 130, main ECU 50 reads in gasoline feedback correction value FAFG.Main ECU 50 can be for example based on Oxygen concentration Ox calculates gasoline feedback correction value FAFG in addition.
Then, in step 140, main ECU 50 reads in gasoline air fuel ratio learning value FGG.Main ECU 50 for example can be in addition The average emitted dose of the average emitted dose (measured value) and final gasoline injection amount that calculate final gasoline injection amount (calculates Value) difference absolute value, be used as gasoline air fuel ratio learning value FGG.Here, main ECU 50 is believed using the detection of lambda sensor 42 Number, the study control of gasoline air-fuel ratio is performed when oxygen concentration Ox is stable.Omit the detailed description of the control.
Then, in step 150, main ECU 50 calculates final gasoline injection amount TAUG.Main ECU 50 can be by right Basic emitted dose TAUGB is multiplied by various corrected value KCG, gasoline feedback correction value FAFG and gasoline air fuel ratio learning value FGG comes Calculate final gasoline injection amount TAUG.
Afterwards, in a step 160, main ECU 50 performs gasoline injection amount control based on final gasoline injection amount TAUG System.That is, main ECU 50 controls petrol injector 22 based on final gasoline injection amount TAUG, thus performs gasoline injection control System.The processing of the step 160 is carried out in the case where mode switch 66 is switched to gasoline mode.Then, by main ECU The signal related to the control of gasoline, the i.e. final gasoline injection amount TAUG of 50 generations are output to gasoline via secondary ECU 51 Injector 22.Afterwards, main ECU 50 makes processing return to step 100.
According to above-mentioned control, main ECU 50 controls the utilization gasoline of engine 1 based on final gasoline injection amount TAUG Operating.Here, in the case where mode switch 66 is switched to gasoline mode, final gasoline is sprayed via secondary ECU 51 TAUG signal output is measured to petrol injector 22.In addition, main ECU 50 performs the gasoline air-fuel ratio related to gasoline system, device Study control, and by the gasoline air fuel ratio learning value FGG obtained by the control reflections into the control using the operating of gasoline. Here, main ECU 50 performs the study control of gasoline air-fuel ratio by using the detection signal of lambda sensor 42.
Then, the CNG emitted doses for illustrating to be performed by secondary ECU 51 control.Shown in Fig. 4 by flow chart in its control Hold.
When processing is transferred to the routine, in step 200, secondary ECU 51 determines whether that CNG is operated.The energy of secondary ECU 51 The switching state of enough operating condition or mode switch 66 based on engine 1 carries out the judgement.It is affirmative in the judged result In the case of, secondary ECU 51 makes processing be transferred to step 210, and in the case where the judged result is negative, secondary ECU 51 makes place Reason is transferred to step 200.
In step 210, secondary ECU 51 reads in the final gasoline injection amount TAUG calculated by main ECU 50.
Then, in a step 220, secondary ECU 51 reads in CNG air fuel ratio learning values FGC.Learning value FGC is described below Computational methods.
Then, in step 230, secondary ECU 51 reads in the corrected value KCC of CNG systems.It is described below corrected value KCC's Computational methods.
Then, in step 240, secondary ECU 51 judges whether CNG air fuel ratio learning values FGC is within fixed value.That is, it is secondary ECU 51 judges whether CNG air fuel ratio learning values FGC does not occur significantly to change.In the present embodiment, the judgement is equivalent to right The exception of CNG associated components (CNG system, devices) is diagnosed.Then, in the case where the judged result is affirmative, i.e. can In the case of being judged as that CNG associated components are normal, secondary ECU 51 makes processing be transferred to step 250.On the other hand, in the judgement knot Fruit is that secondary ECU 51 is transferred to processing in the case of negating, i.e. in the case where can interpolate that as CNG associated components exceptions Step 270.
In step 250, secondary ECU 51 calculates final CNG emitted doses TAUC.Secondary ECU 51 can be to final gasoline The gasoline injection amount is corrected to CNG by the corrected value KCC and CNG air fuel ratio learning value FGC that emitted dose TAUG is multiplied by CNG systems With thus calculating final CNG emitted doses TAUC.
Afterwards, secondary ECU 51 performs the control of CNG emitted doses based on final CNG emitted doses TAUC.That is, the bases of secondary ECU 51 CNG injectors 32 are controlled in the final CNG emitted doses TAUC for being corrected as CNG, thus perform CNG injection controls.It Afterwards, secondary ECU 51 makes processing return to step 200.
On the other hand, in the step 270 for shifting and arriving from step 240, because CNG associated components are abnormal, therefore secondary ECU 51 carry out diagnosis output.For example, secondary ECU 51 can make the flicker of pattern lamp 67 be used as diagnosis output.Thereby, it is possible to driving The exception of member's notice CNG associated components.
Then, in step 280, because CNG associated components are abnormal, therefore secondary ECU 51 is switched from using CNG operating To utilize the operating of gasoline.That is, secondary ECU 51 switches to gasoline to operate by switching each coupled switch 52,53.Afterwards, it is secondary ECU 51 makes processing return to step 200.
According to above-mentioned control, secondary ECU 51 utilizes CNG's based on final CNG emitted doses TAUC come control engine 1 Operating.Here, in the case where mode switch 66 is switched to CNG patterns, secondary ECU 51 will export final from main ECU 50 Gasoline injection amount TAUG signal correction CNG injectors 32 are output to after for CNG.In addition, secondary ECU 51 is performed and CNG systems Device-dependent CNG air-fuel ratios study control, and the CNG air fuel ratio learning values FGC obtained by the control reflections are arrived and utilized In the control of CNG operating.In addition, secondary ECU 51 diagnoses the exception of CNG system, devices based on CNG air fuel ratio learning values FGC, It is judged as depositing in an exceptional case, the operating of engine 1 is switched to from the operating using CNG to the operating using gasoline.
Then, illustrate by the content of the CNG air-fuel ratios study controls performed of secondary ECU 51.Illustrated in Fig. 5 by flow Its control content.
When processing is transferred to the routine, secondary ECU 51 reads in solar term valve opening TA in step 300, in the step 310 Read in engine speed NE.
Then, in step 320, secondary ECU 51 calculates engine load KL.Secondary ECU 51 for example can be by referring to such as Load mapping graph shown in Fig. 6 calculates engine load KL.The load mapping graph turns according to solar term valve opening TA and engine Relation between fast NE carrys out regulation engine load KL.In the case where engine speed NE is low (slow-speed of revolution), as shown by the solid line, Even if solar term valve opening TA is big, engine load KL is also smaller, such as thick in the case of engine speed NE height (high rotating speed) Shown in line, when solar term valve opening TA changes are big, it is high that engine load KL becomes comparison.Can be by being entered according to engine speed NE Row is corrected to obtain the engine load KL between the slow-speed of revolution and high rotating speed.
Then, in a step 330, secondary ECU 51 calculates CNG basic emitted dose TAUCB.Secondary ECU51 can be by hair Engine load KL is multiplied by numerical value performance-relevant with the monomer of CNG injectors 32 and defined constant to calculate the basic emitted dose TAUCB。
Then, in step 340, secondary ECU 51 calculates the corrected value KCC of CNG systems.Secondary ECU 51 can be based on by each CNG The pressure and temperature for the CNG that pressure sensor 61,62 and CNG temperature sensors 63 detect, by referring to the gentle combustion of defined combustion Mapping graph is pressed to calculate corrected value KCC.
Then, in step 350, secondary ECU 51 calculates final CNG and calculates emitted dose TAUCC (calculated value).Secondary ECU 51 can calculate injection by being multiplied by the corrected value KCC of CNG systems to CNG basic emitted dose TAUCB to calculate the final CNG Measure TAUCC.
Then, in step 360, secondary ECU 51 judges whether solar term valve opening TA stablizes.That is, secondary ECU51 judges solar term Whether valve opening TA in prescribed limit and changes few.Secondary ECU 51 shifts processing in the case where the judged result is affirmative To step 370, processing is set to return to step 300 in the case where the judged result is negative.
In step 370, the average spray of the final CNG emitted doses TAUC when calculating solar term of secondary ECU 51 valve opening is stable The amount of penetrating TAUCAVE (measured value).Secondary ECU 51 can calculate the final CNG emitted doses in solar term valve opening TA stable region TAUC average value is used as the average emitted dose TAUCAVE.
Then, in step 380, final CNG when secondary ECU 51 calculates solar term valve opening stabilization calculates emitted dose TAUCC average emitted dose TAUCCAVE (calculated value).Secondary ECU 51 can be calculated in solar term valve opening TA stable region The average value that final CNG calculates emitted dose TAUCC is used as the average emitted dose TAUCCAVE.
Then, in step 390, secondary ECU 51 judges above-mentioned average emitted dose TAUCAVE (measured value) and average spray Whether the absolute value of the amount of penetrating TAUCCAVE (calculated value) difference is more than setting D1.Secondary ECU 51 is affirmative in the judged result In the case of processing is transferred to step 400, the judged result for negative in the case of processing is returned to step 300.
In step 400, CNG air fuel ratio learning values FGC is calculated.Secondary ECU 51 can calculate average emitted dose TAUCAVE The absolute value of (measured value) and average emitted dose TAUCCAVE (calculated value) difference is used as air fuel ratio learning value FGC.Afterwards, Secondary ECU 51 makes processing return to step 300.
According to above-mentioned control, secondary ECU 51 performs using the detection signal of air throttle sensor 41 is solar term valve opening TA The study control of CNG air-fuel ratios.In detail, when solar term valve opening TA is stable, the final CNG sprays in the stable region are calculated Final CNG in the amount of penetrating TAUC average emitted dose TAUCAVE and the stable region calculates emitted dose TAUCC average spray The amount of penetrating TAUCCAVE, in the exhausted of average emitted dose TAUCAVE (measured value) and average emitted dose TAUCCAVE (calculated value) difference When being more than setting D1 to value, calculate the difference and be used as CNG air fuel ratio learning values FGC.
The structure of the gaseous fuel system system (CNG systems system) of present embodiment from the description above, gasoline system is sent out Attached installation CNG systems system is come combined with gasoline system engine system after motivation system, thus forms dual fuel engine system. In the state of the dual fuel engine system is constituted, main ECU 50 controls the utilization of engine 1 using gasoline system, device The operating of gasoline, the gasoline air-fuel ratio related to gasoline system, device is performed based on the testing result of various sensors 41~45 Control is practised, and the gasoline air fuel ratio learning value FGG obtained by the control is reflected to the operating using gasoline of engine 1 In control.On the other hand, secondary ECU 51 controls the operating using CNG of engine 1, the quilts of secondary ECU 51 using CNG system, devices Individually enter the testing result (solar term valve opening TA, engine speed NE) of air throttle sensor 41 and speed probe 43, base Come to learn the control mutually independently execution CNG air-fuel ratio study related with CNG system, devices to gasoline air-fuel ratio in the testing result Control.Then, the CNG air fuel ratio learning values FGC obtained by the control reflections to engine 1 are utilized CNG by secondary ECU 51 Operating control in.Thus, even if even if from the operating using gasoline switch to the operating using CNG, i.e., engine 1 Operating switches to CNG patterns from gasoline mode, and gasoline air fuel ratio learning value FGG will not also be reflected to the utilization CNG of engine 1 Operating control in.This point is in structure with utilizing liquid fuel to calculate the air fuel ratio learning value of gaseous fuel The past case of air fuel ratio learning value is different.Therefore, when switching to CNG patterns from gasoline mode, final CNG emitted doses TAUC Steps change will not occur.Therefore, after to gasoline system engine system attached installation CNG systems system and constitute double fuel hair In the state of motivation system, even if engine 1 switches to the operating using CNG from the operating using gasoline, it can also suppress CNG Air fuel ratio learning value FGC deviates from true value, so as to prevent deterioration of emission, the driving of the operating using CNG of engine 1 Deteriorate.
According to the structure of present embodiment, main ECU 50 is performed using the detection signal (oxygen concentration Ox) of lambda sensor 42 The study control of gasoline air-fuel ratio, on the other hand, secondary ECU 51 utilizes detection signal (the solar term valve opening of air throttle sensor 41 TA) controlled to perform the study of CNG air-fuel ratios.Thus, without using lambda sensor to perform CNG air-fuel ratios study control 42, at attached installation secondary ECU 51 after to gasoline system engine system, without will need to take the oxygen of noise counter plan to pass wiring Sensor 42 is connected to secondary ECU51.Produced therefore, it is possible to suppress the noise at lambda sensor 42, so as to ensure gasoline air-fuel Than the precision of study control.
According to the structure of present embodiment, main ECU 50, petrol injector 22, CNG injectors 32 and mode switch 66 It is connected to secondary ECU 51.Moreover, in the case where mode switch 66 is switched to gasoline mode, by main ECU 50 is generating and vapour Signal, the i.e. final gasoline injection amount TAUG of the control correlation of oil are output to petrol injector 22 via secondary ECU 51.Separately Outside, in the case where mode switch 66 is switched to CNG patterns, will be exported by secondary ECU 51 from main ECU 50 and gasoline The related signal (final gasoline injection amount TAUG) of control is output to CNG injectors 32 after being corrected to CNG signal.Cause And without making to share the signal related to the control of gasoline in main ECU 50 and secondary ECU 51 from main ECU 50 to vapour The wiring branch of oil ejector 22.In addition, petrol injector 22, CNG injectors 32 and mode switch 66 are intensively connected to This part of secondary ECU 51.Therefore, can be by secondary ECU in attached installation CNG systems system after to gasoline system engine system 51 are used as being used for the distributor electrically connected with petrol injector 22, without setting distributor in addition, so as to realize CNG systems The simplification of the rear attached installation wiring of system.
According to the structure of present embodiment, deposited in an exceptional case in CNG system, devices, utilize CNG's from engine 1 Operating switches to the operating using gasoline of engine 1, thus when being operated using CNG CNG system, devices exist it is different Often, also can continue the operating of engine 1.Therefore, it is possible to avoid the undesirable condition of the operating using CNG of engine 1 Produce and the unexpected of engine 1 stops.In the present embodiment, deposited in an exceptional case in CNG system, devices, pass through diagnosis Export and pattern lamp 67 is entered line flicker, therefore can be to the driver notification exception, must so as to promote driver to take The countermeasure wanted.
In addition, the present invention is not limited to aforementioned embodiments, also can be appropriate in the range of the main idea of invention is not departed from The part for changing structure is implemented.
In the foregoing embodiment, using CNG as gaseous fuel, but also can as liquid fuel using gasoline It is used as gaseous fuel using liquefied petroleum gas (LPG).
Industrial applicability
The present invention can be used in by attached installation gaseous fuel system system after liquid fuel system engine system and structure Into dual fuel engine system.

Claims (4)

1. a kind of gaseous fuel system system, attached installation gaseous fuel system system after liquid fuel system engine system is come and this Liquid fuel system engine system is combined, thus forms the use to liquid fuel and gaseous fuel and switches over to control The dual fuel engine system of the operating of engine is stated, wherein, liquid fuel system engine system possesses：Engine；Liquid Fluid fuel system, device, it is relevant with the operating of the engine；Operating condition detection unit, it is used to detect the engine Operating condition；And main control unit, it is used for the testing result based on the operating condition detection unit, uses the liquid Fuel system, device controls the operating using the liquid fuel of the engine, and the main control unit is configured to be based on institute The testing result of operating condition detection unit is stated to perform the liquid fuel air-fuel ratio related to the liquid fuel system, device Control is practised, and the liquid fuel air fuel ratio learning value obtained by the control reflection is arrived to the operating for utilizing the liquid fuel In control,
Gaseous fuel system system is characterised by possessing：Gaseous fuel system, device, the operating of itself and the engine have Close；And secondary control unit, it is used to control the utilization of the engine gas using the gaseous fuel system, device The operating of fuel,
The secondary control unit is configured to：The testing result of the operating condition detection unit is individually entered, based on the detection As a result, learn control to the liquid fuel air-fuel ratio and mutually independently perform the gas combustion related with the gaseous fuel system, device Expect air-fuel ratio study control, and the gaseous fuel air fuel ratio learning value obtained by the control reflection is arrived and fired using the gas In the control of the operating of material.
2. gaseous fuel system according to claim 1 system, it is characterised in that
The liquid fuel system, device includes air throttle, and the air throttle is used to adjust the air inflow for being drawn into the engine,
The operating condition detection unit includes：Lambda sensor, it is used to detect the oxygen concentration in the exhaust of the engine；With And air throttle sensor, it is used for the aperture for detecting the air throttle,
The main control unit performs the liquid fuel air-fuel ratio study control using the detection signal of the lambda sensor,
The secondary control unit performs the gaseous fuel air-fuel ratio study using the detection signal of the air throttle sensor Control.
3. gaseous fuel system according to claim 1 or 2 system, it is characterised in that
The liquid fuel system, device includes liquid fuel feed unit, and the liquid fuel feed unit is used for the engine The liquid fuel is supplied,
The main control unit is configured to the supply for the liquid fuel that control is carried out by the liquid fuel feed unit,
The gaseous fuel system, device includes：Gaseous fuel feed unit, it is used to supply the gas combustion to the engine Material；And mode switch, in order to switch using the liquid fuel mode of the liquid fuel and using the gaseous fuel Gaseous fuel pattern and the mode switch is operated,
The main control unit, the liquid fuel feed unit, the gaseous fuel feed unit and the mode switch The secondary control unit is connected to,
In the case where the mode switch is switched to the liquid fuel mode, it is configured to：Via the secondary control unit The signal output related to the control of the liquid fuel generated by the main control unit is supplied to the liquid fuel Unit,
In the case where the mode switch is switched to the gaseous fuel pattern, it is configured to：The secondary control unit will be from The main control unit output control signal of the related signal correction for the gaseous fuel to the liquid fuel After be output to the gaseous fuel feed unit.
4. the gaseous fuel system system according to any one of claims 1 to 3, it is characterised in that
The secondary control unit diagnoses the exception of the gaseous fuel system, device based on the gaseous fuel air fuel ratio learning value, It is being judged as depositing in an exceptional case, the fortune using the liquid fuel is switched to from the operating using the gaseous fuel Turn.
CN201710369720.9A 2016-05-23 2017-05-23 Gaseous fuel system system Withdrawn CN107420208A (en)

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JP2016102434A JP2017210876A (en) 2016-05-23 2016-05-23 Gas fuel system
JP2016-102434 2016-05-23

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CN110284977A (en) * 2019-06-12 2019-09-27 拓尔普科技有限公司 A kind of high low grade Full-automatic cutting changes fuel supply method
US20220282835A1 (en) * 2020-06-01 2022-09-08 Daniel McNicholas Safe Transportation System Operations Including Fueling, Transfer and Charging

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CN108331668A (en) * 2018-02-08 2018-07-27 浙江吉利控股集团有限公司 Oil-gas switch method and system
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CN110284977A (en) * 2019-06-12 2019-09-27 拓尔普科技有限公司 A kind of high low grade Full-automatic cutting changes fuel supply method
US20220282835A1 (en) * 2020-06-01 2022-09-08 Daniel McNicholas Safe Transportation System Operations Including Fueling, Transfer and Charging
WO2022256280A1 (en) * 2020-06-01 2022-12-08 Mcnicholas Daniel Safe transportation system operations
US11703186B2 (en) * 2020-06-01 2023-07-18 Daniel McNicholas Safe transportation system operations including fueling, transfer and charging

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