CN105626284A - Gas flow control method and device of dual-fuel engine - Google Patents
Gas flow control method and device of dual-fuel engine Download PDFInfo
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- CN105626284A CN105626284A CN201511024773.4A CN201511024773A CN105626284A CN 105626284 A CN105626284 A CN 105626284A CN 201511024773 A CN201511024773 A CN 201511024773A CN 105626284 A CN105626284 A CN 105626284A
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- gas flow
- flow control
- control valve
- engine
- aperture
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Classifications
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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
- F02D41/0025—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
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/70—Type of control algorithm
- F05B2270/705—Type of control algorithm proportional-integral
-
- 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
Abstract
The invention provides a gas flow control method and device of dual-fuel engine. The method comprises the following steps: acquiring current revolving speed information and current power information of the engine and current open degree of a gas flow control valve; inquiring required open degree of the gas flow control valve in an MAP chart according to the current revolving speed information and the current power information; controlling through proportional integral according to the current open degree and the required open degree, and outputting a driving control signal so as to control the engine to run under the required open degree of the gas flow control valve, wherein the MAP chart is a relation chart of the revolving speed of the engine and the required open degree of the gas flow control valve. The method can effectively improve emission level of the engine on the premise of relatively low modification, application and maintenance costs.
Description
Technical field
The present invention relates to technical field of electronic control, particularly relate to a kind of dual-fuel engine fuel gas flow rate controlling method and device.
Background technology
At present; along with the enforcement of state four, the contour Abgasgesetz of state five and people are to the reinforcement of environmental protection consciousness; the pure engine generator set that on market, mechanical pump joined by the electronic governor of up-front buys can not meet current emission regulation demands gradually, faces the possibility eliminated. In addition, although being currently widely used on road vehicle diesel engine, high pressure common rail electric-controlled injection system can meet the emission request of generating set, but replacing and maintenance cost are higher.
Therefore, under the prerequisite that transformation, application and maintenance cost are lower, how effectively to improve engine emission level and become problem demanding prompt solution.
Summary of the invention
For defect of the prior art, the present invention provides a kind of dual-fuel engine fuel gas flow rate controlling method and device, under the prerequisite that transformation, application and maintenance cost are lower, can effectively improve engine emission level.
First aspect, the present invention provides a kind of dual-fuel engine fuel gas flow rate controlling method, and described method comprises:
Obtain the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve in real time;
According to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve;
According to described current aperture and demand aperture passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine;
Wherein, described MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
Preferably, in institute according to described current rotary speed information and current power information, before inquiring about the demand aperture of described gas flow control valve in default MAP table, described method also comprises:
Judge whether engine is in startup, idling or Smaller load working order;
Described according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve, comprising:
When engine is not in startup, idling and Smaller load working order, according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve.
Preferably, when engine is in startup, idling or Smaller load working order, diesel fuel mode is adopted to run described engine.
Preferably, described according to described current rotary speed information and current power information, before inquiring about the demand aperture of described gas flow control valve in default MAP table, described method also comprises:
Rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
Preferably, the described rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, comprising:
When diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points;
When dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
Second aspect, the present invention provides a kind of dual-fuel engine gas flow control device, and described device comprises:
Information acquisition unit, for obtaining the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve in real time;
Query unit, for according to described current rotary speed information and current power information, inquiring about the demand aperture of described gas flow control valve in default MAP table;
Control unit, for according to described current aperture and demand aperture passing ratio integral control, exporting drive control signal, run to control engine under the demand aperture of described gas flow control valve;
Wherein, described MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
Preferably, described device also comprises:
Identifying unit, for judging whether engine is in startup, idling or Smaller load working order;
Correspondingly, query unit, for when engine is not in startup, idling and Smaller load working order, according to described current rotary speed information and current power information, inquires about the demand aperture of described gas flow control valve in default MAP table.
Preferably, described control unit, for when engine is in startup, idling or Smaller load working order, adopting diesel fuel mode to run described engine.
Preferably, described device also comprises:
MAP table determining unit, for the rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
Preferably, described MAP table determining unit, specifically for when diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points; When dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
As shown from the above technical solution, the dual-fuel engine fuel gas flow rate controlling method of the present invention and device, by obtaining the current aperture of the current rotating speed of engine and power information and described gas flow control valve; And in default MAP table, inquire about the demand aperture of the gas flow control valve corresponding with current rotating speed and power; Thus passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine. Thus, under the prerequisite that transformation, application and maintenance cost are lower, engine emission level can effectively be improved.
Accompanying drawing explanation
The schematic flow sheet of the dual-fuel engine fuel gas flow rate controlling method that Fig. 1 provides for one embodiment of the invention;
The schematic flow sheet of the dual-fuel engine fuel gas flow rate controlling method that Fig. 2 provides for another embodiment of the present invention;
The structural representation of the dual-fuel engine gas flow control device that Fig. 3 provides for one embodiment of the invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is carried out clear, complete description, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on embodiments of the invention, those of ordinary skill in the art, not making other the embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 shows the schematic flow sheet of dual-fuel engine fuel gas flow rate controlling method that one embodiment of the invention provides, as shown in Figure 1, the dual-fuel engine fuel gas flow rate controlling method of the present embodiment as follows described in.
101, the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve is obtained in real time.
Will be understood that, the dual-fuel engine fuel gas flow rate controlling method of the present embodiment proposes on the basis of original diesel motor, under the prerequisite of the rotating speed and power that keep diesel motor, diesel oil acting is replaced with the combustion gas of a part, engine only needs relatively less diesel oil just can maintain identical rotating speed and power, therefore automatically reduce throttle tooth bar by electronic electronic, thus reduce the quantity discharged of engine.
When practical application, usually first engine is run with diesel fuel mode, after the rotating speed and power stability of engine, open gas flow control valve make combustion gas enter start in engine cylinder acting, the electronic electronic of diesel fuel mode will adjust throttle tooth bar automatically, thus increase or reduce diesel oil fuel charge.
It should be noted that no matter which kind of mode operation engine is in, all need the current aperture obtaining the current rotary speed information of engine, current power information and gas flow control valve in real time.
102, according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve.
It should be noted that above-mentioned MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
In a particular application, before performing above-mentioned step 102, the dual-fuel engine fuel gas flow rate controlling method of the present embodiment also comprises not shown step 102 '.
102 ', according to rotary speed information and the power information of each operating mode point, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
Preferably, above-mentioned step 102 ' also comprise not shown sub-step 1021 ' and sub-step 1022 '.
1021 ', when diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points.
1022 ', when dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
Specifically, first engine is set to diesel fuel mode, taking the power of motor speed and engine as stationary coordinate, by engine from zero load to peak power output interval in be divided into multiple operating mode point, now can record the parameters of engine under each power, as detonation pressure parameter, row's temperature parameter, water temperature parameters and revolution fluctuation parameter etc. as a reference.
Further, engine is set to dual fuel mode, for above-mentioned each operating mode point coordinate, increases gas flow control valve aperture gradually, until the rotating speed of engine becomes unstable, or the detonation pressure of engine, row's temperature and water temperature parameters abnormal till. Now slowly reducing the gas flow control valve aperture of this operating mode point again, until each parameter of engine is tending towards normal, gas flow control valve aperture corresponding to this moment is the demand aperture of gas flow control valve corresponding for this rotating speed and power in MAP table.
Each rotating speed and the demand aperture table of gas flow control valve corresponding to power can be obtained in the manner described above. Thus the demand aperture of gas flow control valve can be inquired about in MAP table according to current rotary speed information and current power information.
It should be noted that when engine is in startup, idling and Smaller load working order, it is necessary to running under diesel fuel mode, now corresponding in MAP table demand aperture can be zero. In addition, the demand aperture of each rotating speed in MAP table and gas flow control valve corresponding to power is the maximum opening under this rotating speed and power situation, in actual applications, rationally can arranging when being not more than this aperture according to specific requirement, it is not limited by the present embodiment.
103, according to described current aperture and demand aperture passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine.
After obtaining above-mentioned demand aperture and current opening value, can adoption rate integration (PI) closed-loop control, obtain corresponding actuate signal dutycycle, thus export drive control signal, and drive gas flow control valve with this drive control signal, engine is run under the demand aperture of gas flow control valve.
The dual-fuel engine fuel gas flow rate controlling method of the present embodiment, by obtaining the current aperture of the current rotating speed of engine and power information and described gas flow control valve; And in default MAP table, inquire about the demand aperture of the gas flow control valve corresponding with current rotating speed and power; Thus passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine. Thus, under the prerequisite that transformation, application and maintenance cost are lower, engine emission level can effectively be improved.
Fig. 2 shows the schematic flow sheet of dual-fuel engine fuel gas flow rate controlling method that another embodiment of the present invention provides, as shown in Figure 2, the dual-fuel engine fuel gas flow rate controlling method of the present embodiment as follows described in.
201, the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve is obtained in real time.
202, judge whether engine is in startup, idling or Smaller load working order. When engine is not in startup, idling and Smaller load working order, perform step 203 to step 204; When engine is in startup, idling or Smaller load working order, perform step 205.
203, according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve.
204, according to described current aperture and demand aperture passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine.
The step 201 of the present embodiment, step 203 and step 204 and above-mentioned step 101 are similar to step 103, repeat no more herein.
205, when engine is in startup, idling or Smaller load working order, diesel fuel mode is adopted to run described engine.
It will be appreciated that above-mentioned dual fuel mode is the improvement under original diesel fuel mode, therefore, diesel fuel mode must be adopted completely engine is run when engine is in startup, idling or Smaller load working order.
When practical application, when load occurs load or subtract load situation, first the fuel charge of diesel oil can change to maintain original rotating speed rapidly, hereafter obtains rotary speed information and power information again, thus control gas flow control valve to the aperture in MAP table, to improve exhaust level.
The dual-fuel engine fuel gas flow rate controlling method of the present embodiment, by obtaining the current aperture of the current rotating speed of engine and power information and described gas flow control valve; And in default MAP table, inquire about the demand aperture of the gas flow control valve corresponding with current rotating speed and power; Thus passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine. Thus, under the prerequisite that transformation, application and maintenance cost are lower, engine emission level can effectively be improved.
Fig. 3 shows the dual-fuel engine gas flow control device that one embodiment of the invention provides, and as described in Figure 3, the dual-fuel engine gas flow control device of the present embodiment, comprising: information acquisition unit 31, query unit 32 and control unit 33.
Information acquisition unit 31, for obtaining the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve in real time;
Query unit 32, for according to described current rotary speed information and current power information, inquiring about the demand aperture of described gas flow control valve in default MAP table;
Control unit 33, for according to described current aperture and demand aperture passing ratio integral control, exporting drive control signal, run to control engine under the demand aperture of described gas flow control valve;
Wherein, described MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
Preferably, the dual-fuel engine gas flow control device of the present embodiment also comprises not shown identifying unit.
Identifying unit, for judging whether engine is in startup, idling or Smaller load working order;
Correspondingly, query unit 32, for when engine is not in startup, idling and Smaller load working order, according to described current rotary speed information and current power information, inquires about the demand aperture of described gas flow control valve in default MAP table.
Preferably, above-mentioned control unit, also for when engine is in startup, idling or Smaller load working order, adopting diesel fuel mode to run described engine.
Preferably, the dual-fuel engine gas flow control device of the present embodiment also comprises not shown.
MAP table determining unit, for the rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
Preferably, above-mentioned described MAP table determining unit, specifically for when diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points; When dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
The dual-fuel engine gas flow control device of the present embodiment, it is possible to for performing the technical scheme of embodiment of the method shown in above-mentioned Fig. 1 or Fig. 2, its realize principle and technique effect similar, repeat no more herein.
The dual-fuel engine gas flow control device of the present embodiment, by obtaining the current aperture of the current rotating speed of engine and power information and described gas flow control valve; And in default MAP table, inquire about the demand aperture of the gas flow control valve corresponding with current rotating speed and power; Thus passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine. Thus, under the prerequisite that transformation, application and maintenance cost are lower, engine emission level can effectively be improved.
In actual applications, electronically controlled unit (ElectronicControlUnit can be adopted, it is called for short ECU) as above-mentioned dual-fuel engine gas flow control device, and can in conjunction with diesel oil/dual fuel switch, gas flow control valve, gas supply system and engine composition dual-fuel engine gas-flow amount control system, according to customer need, above-mentioned diesel oil/dual fuel switch can be opened to diesel oil operational mode or dual fuel, when engine is in dual fuel, the step of above-mentioned Fig. 1 and Fig. 2 can be performed, to realize the object improving engine emission level.
Last it is noted that above each embodiment is only in order to illustrate the technical scheme of the present invention, it is not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technology feature is carried out equivalent replacement; And these amendments or replacement, do not make the essence disengaging the scope of the claims in the present invention of appropriate technical solution.
Claims (10)
1. a dual-fuel engine fuel gas flow rate controlling method, it is characterised in that, described method comprises:
Obtain the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve in real time;
According to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve;
According to described current aperture and demand aperture passing ratio integral control, export drive control signal, run under the demand aperture of described gas flow control valve to control engine;
Wherein, described MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
2. method according to claim 1, it is characterised in that, in institute according to described current rotary speed information and current power information, before inquiring about the demand aperture of described gas flow control valve in default MAP table, described method also comprises:
Judge whether engine is in startup, idling or Smaller load working order;
Described according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve, comprising:
When engine is not in startup, idling and Smaller load working order, according to described current rotary speed information and current power information, default MAP table is inquired about the demand aperture of described gas flow control valve.
3. method according to claim 2, it is characterised in that, when engine is in startup, idling or Smaller load working order, adopt diesel fuel mode to run described engine.
4. method according to claim 1, it is characterised in that, described according to described current rotary speed information and current power information, before inquiring about the demand aperture of described gas flow control valve in default MAP table, described method also comprises:
Rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
5. method according to claim 4, it is characterised in that, the described rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, comprising:
When diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points;
When dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
6. a dual-fuel engine gas flow control device, it is characterised in that, described device comprises:
Information acquisition unit, for obtaining the current aperture of the current rotary speed information of engine, current power information and described gas flow control valve in real time;
Query unit, for according to described current rotary speed information and current power information, inquiring about the demand aperture of described gas flow control valve in default MAP table;
Control unit, for according to described current aperture and demand aperture passing ratio integral control, exporting drive control signal, run to control engine under the demand aperture of described gas flow control valve;
Wherein, described MAP table is motor speed and the relation synopsis of power and gas flow control valve demand aperture.
7. device according to claim 6, it is characterised in that, described device also comprises:
Identifying unit, for judging whether engine is in startup, idling or Smaller load working order;
Correspondingly, query unit, for when engine is not in startup, idling and Smaller load working order, according to described current rotary speed information and current power information, inquires about the demand aperture of described gas flow control valve in default MAP table.
8. device according to claim 7, it is characterised in that, described control unit, also for when engine is in startup, idling or Smaller load working order, adopting diesel fuel mode to run described engine.
9. device according to claim 6, it is characterised in that, described device also comprises:
MAP table determining unit, for the rotary speed information according to each operating mode point and power information, it is determined that with the demand aperture of the described gas flow control valve that each pair of operation points is answered, to obtain described MAP table.
10. device according to claim 9, it is characterised in that, described MAP table determining unit, specifically for when diesel fuel mode runs, it is determined that engine is at unloaded and in peak power output interval multiple operating mode points; When dual fuel mode runs, it is determined that the maximum gas flow control valve aperture that each pair of operation points is answered, and with this maximum gas flow control valve aperture, as the demand aperture of the gas flow control valve that this pair of operation points is answered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511024773.4A CN105626284A (en) | 2015-12-30 | 2015-12-30 | Gas flow control method and device of dual-fuel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511024773.4A CN105626284A (en) | 2015-12-30 | 2015-12-30 | Gas flow control method and device of dual-fuel engine |
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| CN105626284A true CN105626284A (en) | 2016-06-01 |
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| CN201511024773.4A Pending CN105626284A (en) | 2015-12-30 | 2015-12-30 | Gas flow control method and device of dual-fuel engine |
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| CN109339943A (en) * | 2018-09-01 | 2019-02-15 | 哈尔滨工程大学 | A kind of natural gas in-cylinder direct-jet dual-fuel engine combustion system with tumble flow combustion chamber |
| CN110531270A (en) * | 2019-09-18 | 2019-12-03 | 上海重塑能源科技有限公司 | A kind of diagnostic method and its diagnostic system of fuel cell air supply system |
| CN110925107A (en) * | 2019-12-20 | 2020-03-27 | 潍柴西港新能源动力有限公司 | Fuel closed-loop control method for gas power generation engine |
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| CN110925107A (en) * | 2019-12-20 | 2020-03-27 | 潍柴西港新能源动力有限公司 | Fuel closed-loop control method for gas power generation engine |
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Application publication date: 20160601 |