CN110259575A - Methanol diesel-oil engine and its scaling method - Google Patents

Methanol diesel-oil engine and its scaling method Download PDF

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Publication number
CN110259575A
CN110259575A CN201910552205.3A CN201910552205A CN110259575A CN 110259575 A CN110259575 A CN 110259575A CN 201910552205 A CN201910552205 A CN 201910552205A CN 110259575 A CN110259575 A CN 110259575A
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China
Prior art keywords
methanol
engine
diesel
ecu
signal
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Pending
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CN201910552205.3A
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Chinese (zh)
Inventor
刘兴华
张越
安晓东
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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Priority to CN201910552205.3A priority Critical patent/CN110259575A/en
Publication of CN110259575A publication Critical patent/CN110259575A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • 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
    • 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
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F02D41/086—Introducing corrections for particular operating conditions for idling taking into account the temperature of the engine
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • 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
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position

Abstract

The invention discloses methanol diesel-oil engine, including methanol injector and compression ignition diesel engine, methanol injector is set at the inlet valve of compression ignition diesel engine；The scaling method of methanol diesel-oil engine, comprising the following steps: S1: pedal travel signal and original vehicle ECU are disconnected；S2: the tach signal and accelerator pedal signal of engine are received by new ECU；S3: the signal of tach signal and gas pedal to engine is analyzed；S4: the result of analysis is exported to former vehicle ECU；Solve the problems, such as that previous methods are complicated, big to engine modification.

Description

Methanol diesel-oil engine and its scaling method
Technical field
The present invention relates to engine arts, especially methanol diesel-oil engine and its scaling method.
Background technique
Since the economy in China goes up year by year, the ownership of vehicle increases year by year in family, and consequent is energy deficiency Problem is gradually increased.China alreadys exceed 40% in the consumption of traffic and transport field petroleum at present, but also increases presenting Trend, it is contemplated that in the year two thousand twenty, this ratio will be more than 60%.
To solve the problems, such as energy deficiency, the higher energy of yield is selected to carry out diesel oil substitute/gasoline particularly important.
China is the maximum producing country of methanol now, and annual output is up to 64,000,000 tons, and methanol can pass through a variety of ways Diameter obtains, and belongs to renewable energy.Solves the problems, such as energy shortage.
Methanol octane number with higher, gasification latent heat are big, and methanol has volatile, low boiling point characteristic, can be improved The combustibility of engine.
The price of No. 0 diesel oil in Beijing is floated at 7730 yuan/ton at present, and industrial methanol price is floated at 2400 yuan/ton, from See methanol as the more economical material benefit of fuel in price.
Since methanol is haveed many advantages, such as, so using methanol that there is certain meaning as the alternative fuel of diesel oil.
Methanol can be used as fuel oil replacing gasoline/diesel oil, and design scheme is a kind of to be started to redesign for the characteristic of methanol Machine；Another kind is to be modified to engine on the basis of original engine, be transformed into methanol engine.
By designing new engine, methanol engine is realized, production is difficult, and complex process will also carry out engine It re-scales, the R&D cycle is long, higher cost.
Engine is modified on the basis of original diesel engine, it, should by engine reformation at methanol engine Scheme is smaller to the performance change of original machine, and production cost is low, and the R&D cycle is short, has certain practical value.
For methanol engine there are two types of modification scheme, a kind of scheme is to be transformed using spark-ignition engine.Another scheme To use compression ignition engine to be transformed.
Spark-ignition engine low efficiency, energy consumption are high, and overall performance is poorer than compression ignition engine, so selecting compression-ignited hair Motivation is transformed into methanol engine.
However, due to the physical characteristic of methanol, the unsuitable compression ignition of methanol needs to light.So to solve ignition problem, methanol Engine needs to retain diesel oil as incendiary source, so producing methanol-diesel engine.
By the injection of electric control system controls diesel oil and methanol.
Methanol fuel injector is arranged at inlet valve, and methanol enters combustion chamber with air inlet, and this method is only needed to engine It is simply changed, be can be realized, so methanol-diesel engine generally uses this method at present.
The prior art one, " control strategy of diesel-methanol compound combustion electric-control system ", this method need to redesign hair The ECU of motivation acquires signal by sensor, is transferred to ECU, control diesel engine operational mode is calculated by ECU, to control The amount of injection of methanol and diesel oil, this method is complex, changes greatly to original machine, and ECU design difficulty is big, and versatility is poor, Later period also needs to re-scale engine performance, heavy workload, needs a large amount of manpower and material resources.
The prior art two, a kind of Methanol/Diesel Dual Fuel diesel engine fuel oil supply method of Institutes Of Technology Of Taiyuan, this method are logical The method for crossing in-cylinder direct-jet, realizes double fuel control, and method is larger to engine modification.Need to design ECU control methanol and bavin Oil spurts amount, it is larger to the change of engine original performance, it finally also needs to demarcate the performance of engine, method is more multiple It is miscellaneous.
Summary of the invention
To solve problems of the prior art, the present invention provides methanol diesel-oil engine and its scaling method, solutions Previous methods of having determined complexity, the problem big to engine modification.
The technical solution adopted by the present invention is that methanol diesel-oil engine, including methanol injector and compression-ignited diesel engine Machine, methanol injector are set at the inlet valve of compression ignition diesel engine, and the automobile electronic control unit of methanol diesel-oil engine is New ECU is fitted without the automobile electronic control unit of methanol injector as former vehicle ECU.
Preferably, the scaling method of methanol diesel-oil engine, comprising the following steps:
S1: pedal travel signal and original vehicle ECU are disconnected；
S2: the tach signal and accelerator pedal signal of engine are received by new ECU；
S3: the signal of tach signal and gas pedal to engine is analyzed；
S4: the result of analysis is exported to former vehicle ECU；
S5: former vehicle ECU according to output as a result, judge the amount of injection of diesel oil, if the revolving speed of engine reaches 1200r/min, Then enter S6；If it is not, then original vehicle ECU works, injection diesel oil returns to S3；
S6: methanol the amount of injection is calculated by new ECU according to revolving speed and pedal position；
S7: new ECU is demarcated.
Preferably, S7 includes following sub-step:
S71: calibration methanol the amount of injection；
S72: virtual pedal signal is demarcated.
Preferably, S71 includes following sub-step:
S711: when engine idling is with slowly running, since engine temperature is low, methanol is not sprayed；When engine exists When revolving speed or accelerator pedal stroke reach 1200r/min, start to spray methanol；
S712: after the calibration of each moment methanol the amount of injection, by mathematical method by methanol the amount of injection and revolving speed and pedal row Journey relation derivation comes out, and is input in new ECU；
S713: in actual work, methanol the amount of injection is controlled by new ECU；
S713: due to methanol can not compression ignition, when revolving speed and throttle reach maximum, former ECU can also spray a small amount of diesel oil, point Fire methanol.
Preferably, S72 includes following sub-step:
S721: as engine speed 1200r/min, pedal travel 15%, virtual pedal signal is practical pedal signal 55%, former vehicle ECU is transmitted a signal to, control diesel injection amount is 55%, and diesel injection is controlled by former vehicle ECU；
S722: the relationship integrated is deposited into new ECU by mathematical method.
Methanol diesel-oil engine and its scaling method of the present invention have the beneficial effect that:
1. going out methanol fuel spout, Cheng Xin is added in engine air inlet tube by the way that former diesel engine is simply transformed Dual fuel engine, this method is small to engine modification, preferably retains former engine performance and safety.
2. design control methanol injection electronic control unit ECU and control method, solve double fuel methanol-diesel engine In the slow-speed of revolution and high revolving speed the problem of engine misses, and former automobile-used ECU will not be changed, it is small on the influence of former vehicle, to former vehicle Performance change it is small, and realize reduction diesel consumption.
3. being able to achieve methanol-diesel engine by this method to operate normally, engine performance and safety are moved with primary Machine difference is smaller.
Detailed description of the invention
Fig. 1 is the control flow block diagram of methanol diesel-oil engine of the present invention and its scaling method.
Fig. 2 is the MAP chart of methanol diesel-oil engine of the present invention and its scaling method.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art, As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy See, all are using the innovation and creation of present inventive concept in the column of protection.
Methanol diesel-oil engine, including methanol injector and compression ignition diesel engine, methanol injector are set to compression ignition At the inlet valve of formula diesel engine, the automobile electronic control unit of methanol diesel-oil engine is new ECU, is fitted without methanol injector Automobile electronic control unit be former vehicle ECU.
For the present embodiment when implementing, the ECU by controlling original machine controls diesel injection, is controlled by newly-designed ECU Methanol injection reduces the repacking cost of engine, saves the repacking time to reach farthest using storage resources, and The reliability of engine is not reduced as much as possible.
Diesel engine is transformed into methanol-diesel engine by the way that former diesel engine is changed lesser method.
The scaling method of the methanol diesel-oil engine of the present embodiment, comprising the following steps:
S1: pedal travel signal and original vehicle ECU are disconnected；
S2: the tach signal and accelerator pedal signal of engine are received by new ECU；
S3: the signal of tach signal and gas pedal to engine is analyzed；
S4: the result of analysis is exported to former vehicle ECU；
S5: former vehicle ECU according to output as a result, judge the amount of injection of diesel oil, if the revolving speed of engine reaches 1200r/min, Then enter S6；If it is not, then original vehicle ECU works, injection diesel oil returns to S3；
S6: methanol the amount of injection is calculated by new ECU according to revolving speed and pedal position；
S7: new ECU is demarcated.
The S7 of the present embodiment includes following sub-step:
S71: calibration methanol the amount of injection；
S72: virtual pedal signal is demarcated.
The S71 of the present embodiment includes following sub-step:
S711: when engine idling is with slowly running, since engine temperature is lower, methanol is not sprayed；Work as engine When revolving speed or accelerator pedal stroke reach 1200r/min, start to spray methanol；
S712: after the calibration of each moment methanol the amount of injection, by mathematical method by methanol the amount of injection and revolving speed and pedal row Journey relation derivation comes out, and is input in new ECU；
S713: in actual work, methanol the amount of injection is controlled by new ECU；
S714: due to methanol can not compression ignition, when revolving speed and throttle reach maximum, former ECU can also spray a small amount of diesel oil, point Fire methanol.
The S72 of the present embodiment includes following sub-step:
S721: as engine speed 1200r/min, pedal travel 15%, virtual pedal signal is practical pedal signal 55%, former vehicle ECU is transmitted a signal to, control diesel injection amount is 55%, and diesel injection is controlled by former vehicle ECU；
S722: the relationship integrated is deposited into new ECU by mathematical method.
The present embodiment selects compression ignition diesel engine, by engine reformation at methanol-diesel engine when implementing Machine.Remodeling method is the installation methanol fuel injector at the inlet valve of engine, and methanol is enable to enter cylinder body with air.
New ECU control methanol injection is designed, new ECU receives engine rotational speed signal and accelerator pedal stroke signal, then Signal is handled.
New ECU cut-in method, pedal travel signal and original vehicle ECU are disconnected, pedal travel signal is passed to new ECU In, then, new ECU analyzes pedal travel signal and tach signal.A new pedal letter is exported based on the analysis results Number it is transferred to former vehicle ECU.As shown in Figure 1.
The injection method of fuel, new ECU spray methanol by judging whether according to tach signal and pedal signal, then will Virtual pedal travel signal is transferred to former vehicle ECU, and former vehicle ECU judges diesel injection according to original program according to virtual pedal signal Amount.
Fuel injecting method, when the piston is near the top dead centre, new ECU start to spray diesel oil by programming Control diesel injector, Then spray methanol fuel injector starts to spray methanol, i.e., diesel oil is compression-ignited engine first at runtime, then, puts right methanol.
New ECU calibration, since the program does not change former vehicle ECU so being not required to demarcate former vehicle ECU, only needs to demarcate New ECU, new ECU need to demarcate two kinds of signals, and a kind of signal is methanol the amount of injection, and another signal is virtual pedal signal.
The calibration of methanol the amount of injection, since engine temperature is lower, does not spray first when engine idling is with slowly running Alcohol, engine reach a timing in revolving speed or accelerator pedal stroke and start to spray methanol, and methanol sprays shown in scale 1.Pedal row Pedal present position is expressed as a percentage in journey signal, and methanol the amount of injection is indicated by percentage.
Control method, according to table 1, when revolving speed reaches 1200r/min, pedal travel 15%, current methanol the amount of injection is 45%.In this approach, by after the calibration of all moment methanol the amount of injection, by mathematical method by methanol the amount of injection and revolving speed and pedal Travel relationships are derived, are input in new ECU, control methanol the amount of injection in the stylish ECU of real work.MAP chart such as Fig. 2 institute Show.
Table 1
Due to methanol can not compression ignition, so former ECU can also spray a small amount of diesel oil when revolving speed and throttle reach maximum, Methanol is lighted after diesel oil compression ignition.
The calibration of virtual pedal signal, when engine idling is with slowly running, virtual pedal signal and practical pedal are believed It is number identical, so original vehicle ECU control methanol the amount of injection is constant in engine idling and low speed.When engine speed or throttle Pedal signal reaches a timing, and virtual pedal signal starts different from practical pedal signal.Shown in table 2.Pedal travel signal is used Percentage indicates pedal present position, and virtual pedal travel is indicated by percentage.
Virtual signal scaling method, as shown in table 2, as engine speed 1200r/min, pedal travel 15%, virtually Pedal signal is practical pedal signal 55%, transmits a signal to former vehicle ECU, and control diesel injection amount is 55%, diesel injection It is controlled by former vehicle ECU.The relationship integrated is deposited into new ECU by mathematical method.
Table 2

Claims (5)

1. methanol diesel-oil engine, which is characterized in that including methanol injector and compression ignition diesel engine, the methanol injection Device is set at the inlet valve of compression ignition diesel engine, and the automobile electronic control unit of the methanol diesel-oil engine is new ECU, is not had There is the automobile electronic control unit of installation methanol injector for former vehicle ECU.
2. the scaling method of methanol diesel-oil engine, which comprises the following steps:
S1: pedal travel signal and original vehicle ECU are disconnected；
S2: the tach signal and accelerator pedal signal of engine are received by new ECU；
S3: the signal of tach signal and gas pedal to engine is analyzed；
S4: the result of analysis is exported to former vehicle ECU；
S5: former vehicle ECU according to output as a result, judge the amount of injection of diesel oil, if the revolving speed of engine reaches 1200r/min, into Enter S6；If it is not, then diesel oil is sprayed in original vehicle ECU work, S3 is returned；
S6: according to engine speed and pedal position, methanol the amount of injection is calculated by new ECU；
S7: new ECU is demarcated.
3. the scaling method of methanol diesel-oil engine according to claim 2, which is characterized in that the S7 includes following son Step:
S71: calibration methanol the amount of injection；
S72: virtual pedal signal is demarcated.
4. the scaling method of methanol diesel-oil engine according to claim 3, which is characterized in that the S71 includes following Sub-step:
S711: when engine idling is with slowly running, since engine temperature is low, methanol is not sprayed；When engine is in revolving speed Or accelerator pedal stroke starts to spray methanol when reaching 1200r/min；
S712: after the calibration of each moment methanol the amount of injection, methanol the amount of injection and revolving speed and pedal travel are closed by mathematical method System derives, is input in new ECU；
S713: in actual work, methanol the amount of injection is controlled by new ECU；
S714: due to methanol can not compression ignition, when revolving speed and throttle reach maximum, former ECU can also spray a small amount of diesel oil, light first Alcohol.
5. the scaling method of methanol diesel-oil engine according to claim 3, which is characterized in that the S72 includes following Sub-step:
S721: as engine speed 1200r/min, pedal travel 15%, virtual pedal signal is practical pedal signal 55%, Former vehicle ECU is transmitted a signal to, control diesel injection amount is 55%, and diesel injection is controlled by former vehicle ECU；
S722: the relationship integrated is deposited into new ECU by mathematical method.
CN201910552205.3A 2019-06-25 2019-06-25 Methanol diesel-oil engine and its scaling method Pending CN110259575A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1470752A (en) * 2003-07-03 2004-01-28 天津大学 Diesel engine intake alcohol injection apparatus and injection control method
EP1636470A1 (en) * 2003-06-12 2006-03-22 Toyota Jidosha Kabushiki Kaisha Spark ignition internal combustion engine
US20140309909A1 (en) * 2011-10-28 2014-10-16 Eht Patents And Licensing Limited Combustion engine
CN104454189A (en) * 2014-12-19 2015-03-25 中国汽车工程研究院股份有限公司 Double-fuel control method for high-pressure common-rail fuel injection system
CN105443251A (en) * 2015-12-04 2016-03-30 长安大学 Fuel supply control method of electric control methanol-diesel dual-fuel engine for vehicle
CN106351735A (en) * 2016-08-26 2017-01-25 石家庄新华能源环保科技股份有限公司 High-efficiency and low-emission power system for hydrogen mixed fuel
CN106704012A (en) * 2017-01-10 2017-05-24 长安大学 Methanol-diesel dual-fuel engine control system and method
CN109404152A (en) * 2018-10-26 2019-03-01 长安大学 Automobile-used automatically controlled methanol-Diesel Dual-Fuel Engine fuel supplies closed loop control method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1636470A1 (en) * 2003-06-12 2006-03-22 Toyota Jidosha Kabushiki Kaisha Spark ignition internal combustion engine
CN1470752A (en) * 2003-07-03 2004-01-28 天津大学 Diesel engine intake alcohol injection apparatus and injection control method
US20140309909A1 (en) * 2011-10-28 2014-10-16 Eht Patents And Licensing Limited Combustion engine
CN104454189A (en) * 2014-12-19 2015-03-25 中国汽车工程研究院股份有限公司 Double-fuel control method for high-pressure common-rail fuel injection system
CN105443251A (en) * 2015-12-04 2016-03-30 长安大学 Fuel supply control method of electric control methanol-diesel dual-fuel engine for vehicle
CN106351735A (en) * 2016-08-26 2017-01-25 石家庄新华能源环保科技股份有限公司 High-efficiency and low-emission power system for hydrogen mixed fuel
CN106704012A (en) * 2017-01-10 2017-05-24 长安大学 Methanol-diesel dual-fuel engine control system and method
CN109404152A (en) * 2018-10-26 2019-03-01 长安大学 Automobile-used automatically controlled methanol-Diesel Dual-Fuel Engine fuel supplies closed loop control method

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Application publication date: 20190920