CN102146854B - Method for correcting ignition timing of natural gas and gasoline dual fuel engine - Google Patents
Method for correcting ignition timing of natural gas and gasoline dual fuel engine Download PDFInfo
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- CN102146854B CN102146854B CN2011100766765A CN201110076676A CN102146854B CN 102146854 B CN102146854 B CN 102146854B CN 2011100766765 A CN2011100766765 A CN 2011100766765A CN 201110076676 A CN201110076676 A CN 201110076676A CN 102146854 B CN102146854 B CN 102146854B
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- 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
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a method for correcting ignition timing of a natural gas and gasoline dual fuel engine. In the method, based on the conventional gasoline engine control system, an ignition timing correction module is arranged in the conventional fuel control; the ignition timing output by the ignition timing correction module comprises an ignition timing signal in a gasoline mode and an ignition timing signal in a natural gas mode; the ignition timing signal in the gasoline mode is output by an electronic control unit (ECU) of the conventional gasoline engine; in the natural gas mode,the natural gas ignition timing is to correct the gasoline ignition timing of the engine under the conditions of the same rotating speed and the same load; corrected ignition MAP is checked accordingto the rotating speed signal and the load of the engine so as to obtain a corrected ignition timing; and the sum of the gasoline ignition timing and the corrected ignition timing is the ignition timing of the natural gas. By the method, the control logic of the dual fuel ECU in the prior art can be optimized.
Description
Technical field
The invention belongs to Motronic control maps control field, relate to a kind of duel fuel engine control system, particularly relate to a kind of rock gas and the method for coreection of gasoline dual fuel engine ignition timing.
Background technique
Increasingly serious along with environment, energy problem, rock gas has become one of important fuel of motor.Gasoline engine refitting is become rock gas/gasoline dual fuel engine, can the more efficient use energy, alleviate environmental crisis.
Existing natural gas/gasoline duel fuel engine control system block diagram in single ECU of duel fuel engine control system, has been stored control logic under the gasoline pattern and the control logic under the rock gas pattern as shown in Figure 1; Aspect actuator driven, oil nozzle drives with one road high-power drive circuit and analog line driver, and blast nozzle drives with one road high-power drive circuit and analog line driver.High-power drive circuit and the analog line driver of the driving blast nozzle that increases are changed greatly ECU hardware circuit complexity, cost height to former petrol engine ECU hardware circuit.And store ignition timing control logic under the gasoline pattern and the ignition timing control logic of rock gas pattern among the duel fuel engine list ECU, and big to former petrol engine ECU control logic change amount, the multiplication of storage code amount, memory consumption is big, and operational efficiency reduces.
Summary of the invention
For overcoming the above-mentioned problems in the prior art, the present invention is the natural gas/gasoline duel fuel engine with former gasoline engine refitting, and a kind of rock gas and the method for coreection of gasoline dual fuel engine ignition timing proposed, set up the ignition timing correcting logic on the basis of former fuel oil control logic, under the combustion gas state, directly the fuel ignition time is modified to the gas ignition time, has reduced the change to former petrol engine ECU, double fuel ECU control logic is oversimplified.
The present invention is specifically by the following technical solutions:
A kind of rock gas and the method for coreection of gasoline dual fuel engine ignition timing, described method is based on former petrol engine control system, in former petrol engine control system, set up the ignition timing correction module, still adopt former gasoline engine ignition system hardware circuit, described ignition timing method of coreection may further comprise the steps:
(1) by former petrol engine control system main control chip pick-up transducers signal, judges whether motor switches to the combustion gas pattern;
(2) if motor is in the fuel oil pattern, then link to each other with analog line driver with the high-power drive circuit of former petrol engine control system by selector switch gating oil nozzle, described control system is according to engine rotational speed signal and load signal inquiry gasoline igniting MAP, by ignition timing correction module output igniting timing signal, this ignition timing signal is the ignition timing signal of former petrol engine ECU output;
(3) if motor is in the combustion gas pattern, then link to each other with analog line driver with the high-power drive circuit of former petrol engine control system by selector switch gating blast nozzle, the ignition timing signal of ignition timing correction module output is the natural gas fired timing signal; Wherein said control system is revised igniting MAP and gasoline igniting MAP according to engine rotational speed signal and load signal inquiry, and correction ignition timing and the addition of inquiring about of gasoline ignition timing obtained described natural gas fired timing signal.
Further, described sensor signal comprises rock gas request switching signal, rock gas air cylinder pressure signal, engine rotational speed signal, engine temperature signal and engine load signal at least; When described main control chip collects rock gas request switching signal, and described rock gas air cylinder pressure is not less than setting value, and engine speed meets or exceeds the setting rotating speed, and engine temperature judges then that greater than setting temperature motor switches the combustion gas pattern.
The ignition timing of ignition timing correction module output comprises ignition timing signal under the gasoline pattern and the ignition timing signal under the rock gas pattern, and the ignition timing signal under the gasoline pattern is the ignition timing signal of former petrol engine ECU output; Under the rock gas pattern, natural gas fired regularly is the correction to the gasoline ignition timing of motor under same rotational speed and load, obtain revising ignition timing according to tach signal and engine load inquiry correction igniting MAP, gasoline ignition timing and correction ignition timing sum are the ignition timing of rock gas.Gasoline igniting MAP is under different rotating speeds and load with correction igniting MAP and carries out engine rig test, makes excess air coefficient equal the two-dimentional form that demarcation in 1 o'clock obtains, and is stored in the program storage of master chip, for the control logic inquiry.
The invention has the advantages that: the natural gas/gasoline dual-fuel control system that the present invention proposes increases the injection pulse width correcting logic of rock gas on the basis of former petrol engine ECU, the ignition timing correcting logic, under the combustion gas state, directly with fuel injection amount, the fuel ignition time is modified to the fuel gas injection amount, the gas ignition time, optimized double fuel ECU control logic in the prior art, special high-power drive circuit and power driving circuit at combustion gas have been reduced, promoted ECU double fuel control response efficient, few to existing petrol engine hardware modifications, the economize on hardware development cost.Further, the natural gas/gasoline selection device of invention, switch oil nozzle/blast nozzle by the ECU control relay, utilize high-power drive circuit and the analog line driver of former petrol engine to drive oil nozzle/blast nozzle, after increasing the combustion gas function, change to former petrol engine ECU hardware circuit is few, simple in structure, and cost is low.
Description of drawings
Fig. 1 is existing natural gas/gasoline duel fuel engine control system block diagram;
Fig. 2 is natural gas/gasoline duel fuel engine control system block diagram of the present invention;
Fig. 3 is the natural gas/gasoline selection device;
Fig. 4 is injection pulse width correction module of the present invention;
Fig. 5 is the ignition timing correction module.
Embodiment
The present invention is described further below in conjunction with Figure of description.
The present invention is based on the duel fuel engine control system and realizes, Fig. 2 is the duel fuel engine control system block diagram of the embodiment of the invention, this control system is that the petrol engine control system is reequiped, the content that increases on the basis of petrol engine control system comprises natural gas supply system, sensor, natural gas/gasoline selection device (as shown in Figure 3), the injection pulse width correcting logic of rock gas and ignition timing correcting logic etc., natural gas supply system adopts existing mature technology, the sensor that increases newly comprises the gaseous-pressure sensor, the fuel gas temperature sensor, decompressor temperature transducers etc. have increased injection pulse width correction module 1 in the main control chip MCU of ECU, ignition timing correction module 2 etc.Former petrol engine sensor and the sensor signal that increases newly are exported to main control chip MCU after signal processing circuit is handled, main control chip MCU is according to the rock gas request switch of driver's operation, engine temperature signal, rock gas air cylinder pressure signal, whether signal determinings such as engine speed switch to the rock gas state, when described main control chip collects rock gas request switching signal, and described rock gas air cylinder pressure is not less than setting value, and engine speed meets or exceeds the setting rotating speed, and engine temperature judges then that greater than setting temperature motor switches the combustion gas pattern.ECU is according to the control logic of writing in the sensor signal that collects and the master chip, by output injection pulse width signal, relay control signal, decompressor electromagnetic valve signal, ignition timing signal and fuel state index signals etc. such as oil nozzle/blast nozzle drive circuit, decompressor drive circuit and spark coil drive circuits.
Fig. 5 is ignition timing correction module of the present invention, and it comprises tach signal, load signal, fuel state, gasoline igniting MAP, revises igniting MAP, fuel selection switch 6.If be in the gasoline state, fuel selection switch 6 is selected the p passage, and ECU is according to tach signal and load signal inquiry gasoline igniting MAP, output igniting timing signal; If be in the rock gas state, fuel selection switch 6 is selected the q passage, ECU revises igniting MAP and gasoline igniting MAP according to the load inquiry of signals of rotational speed sensor and motor, and correction ignition timing and the addition of inquiring about of gasoline ignition timing obtained the natural gas fired timing signal.
Ignition timing signal under the gasoline pattern is the ignition timing signal of former petrol engine ECU output; Under the rock gas pattern, natural gas fired regularly is the correction to the gasoline ignition timing of motor under same rotational speed and load, obtain revising ignition timing according to tach signal and engine load inquiry correction igniting MAP, gasoline ignition timing and correction ignition timing sum are the ignition timing of rock gas.Gasoline igniting MAP is under different rotating speeds and load with correction igniting MAP and carries out engine rig test, makes excess air coefficient equal the two-dimentional form that demarcation in 1 o'clock obtains, and is stored in the program storage of master chip, for the control logic inquiry.
Judgement about the rock gas pattern is: when described main control chip collects rock gas request switching signal, and described rock gas air cylinder pressure is not less than setting value, and engine speed meets or exceeds the setting rotating speed, and engine temperature judges then that greater than setting temperature motor switches the combustion gas pattern.
In order to cooperate method of coreection firing time of the present invention, reach better invention effect, the injection pulse width correction module 1 that in the main control chip MCU of ECU, increases, and adopt mode shown in Figure 4 to realize, it comprises gasoline injection pulse width signal, tach signal, fuel state signal, decompressor temperature signal, natural gas temperature signal, natural pressure force signal, fuel selection switch 5.Behind the engine start, ECU obtains fuel oil injection pulse width signal according to former petrol engine control system, obtains fuel oil state or combustion gas state according to rock gas request switch, engine cooling water temperature, CNG gas-storing capacity, four signals of engine speed.If be in the gasoline state, fuel selection switch 5 is selected the m passage, ECU output gasoline injection pulse width signal tp; If be in the rock gas state, fuel selection switch 5 is selected the n passages, ECU according to gasoline injection pulse width signal tp and engine speed rpm inquiry natural gas injection pulse width conversion coefficient k (tp, rpm), for example at tp=6ms, during rpm=2500r/min, k=86.Simultaneously according to decompressor temperature T r, rock gas work temperature g, corresponding correction factor k1 (Tr), k2 (Tg), the k3 (Pg) of different jet pressure poor (rock gas gas rail pressure Pg is poor with suction pressure MAP's) inquiry.The formula of natural gas injection pulsewidth is:
tg?=?[k(tp;rpm)+k1(Tr)+k2(Tg)+k3(Pg)]×tp
Wherein, natural gas injection pulse width conversion coefficient k (tp, rpm) and different decompressor temperature T r, rock gas work temperature g, correction factor k1 (Tr), k2 (Tg), k3 (Pg) that rock gas gas rail pressure Pg is corresponding with suction pressure MAP under different rotating speeds, load, carry out the engine pedestal rating test, excess air coefficient equals demarcation in 1 o'clock and obtains, be stored in the program storage of master chip, be used for the control logic inquiry.。
Fig. 3 is the natural gas/gasoline selection device, by the relay group 4 of oil nozzle/blast nozzle, switching oil nozzle/blast nozzle.Be example with the four cylinder engine, each cylinder is by one group of oil nozzle/blast nozzle.Wherein, 4 d wiring terminals and 4 e wiring terminals of relay group connect the 12V power supply, normally-closed contact c and oil nozzle solenoid valve positive pole join, and normally opened contact b and blast nozzle solenoid valve positive pole join, and the public negative pole end of each group oil nozzle/blast nozzle solenoid valve is by the pin f control of ECU.4 a wiring terminals of relay group coil are connected together by the pin g control of ECU, when engine combustion gasoline, ECU control pin g, during the relay coil no electric circuit, the switch of relay is in normally-closed contact c place, and the positive pole of oil nozzle connects the power supply of 12V, the gasoline injection pulse width that ECU calculates according to main control chip MCU, by pin f control oil nozzle solenoid valve current"on"time, and then control the gasoline injection amount of the every cylinder of every circulation.When the engine combustion rock gas, ECU is by the energising of pin g control relay coil, make relay switch be in normally opened contact b place, the positive pole of blast nozzle connects the power supply of 12V at this moment, the natural gas injection pulsewidth that ECU calculates according to main control chip MCU, by control pin f, control blast nozzle solenoid valve current"on"time, and then control the emitted dose of the every cylinder rock gas of every circulation.
Protection scope of the present invention is not limited to the above embodiments, and obviously, those skilled in the art can carry out various changes and distortion and do not depart from the scope of the present invention and spirit the present invention.If these changes and distortion belong in the scope of claim of the present invention and equivalent technologies thereof, then the intent of the present invention also comprises these changes and is out of shape interior.
Claims (3)
1. a rock gas and the method for coreection of gasoline dual fuel engine ignition timing, described method is based on former petrol engine control system, set up the ignition timing correction module in former petrol engine control system, oil nozzle and blast nozzle share high-power drive circuit and the analog line driver of former petrol engine control system; It is characterized in that described ignition timing method of coreection may further comprise the steps:
(1) described former petrol engine control system main control chip pick-up transducers signal judges whether motor switches to the combustion gas pattern;
(2) if motor is in the fuel oil pattern, then link to each other with analog line driver with the high-power drive circuit of former petrol engine control system by selector switch gating oil nozzle, described control system is according to engine rotational speed signal and load signal inquiry gasoline igniting MAP, by ignition timing correction module output igniting timing signal, this ignition timing signal is the ignition timing signal of former petrol engine ECU output;
(3) if motor is in the combustion gas pattern, then link to each other with analog line driver with the high-power drive circuit of former petrol engine control system by selector switch gating blast nozzle, the ignition timing signal of ignition timing correction module output is the natural gas fired timing signal, wherein said natural gas fired timing signal be by control system according to engine rotational speed signal and load signal inquiry revise igniting MAP and gasoline igniting MAP, the correction ignition timing of inquiry and the addition of gasoline ignition timing are obtained;
Described gasoline igniting MAP and correction igniting MAP are and carry out engine rig test under different engine and engine loads, make excess air coefficient equal the two-dimentional form that demarcation in 1 o'clock obtains.
2. controlling method according to claim 1, it is characterized in that: described sensor signal comprises rock gas request switching signal, rock gas air cylinder pressure signal, engine rotational speed signal, engine temperature signal at least; When described main control chip collects rock gas request switching signal, and described rock gas air cylinder pressure is not less than setting value, and engine speed meets or exceeds the setting rotating speed, and engine temperature judges then that greater than setting temperature motor switches to the combustion gas pattern.
3. controlling method according to claim 1 and 2 is characterized in that:
Under the combustion gas pattern, natural gas fired regularly is the correction to the gasoline ignition timing of motor under same rotational speed and load, and described gasoline igniting MAP and correction igniting MAP are stored in the program storage of engine control system, and inquiry is provided.
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| CN2011100766765A CN102146854B (en) | 2011-03-29 | 2011-03-29 | Method for correcting ignition timing of natural gas and gasoline dual fuel engine |
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| CN2011100766765A CN102146854B (en) | 2011-03-29 | 2011-03-29 | Method for correcting ignition timing of natural gas and gasoline dual fuel engine |
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| CN102996268B (en) * | 2011-09-16 | 2015-07-01 | 十堰科纳汽车电器有限公司 | Automotive dual-fuel co-combustion method and control system |
| CN103422997B (en) * | 2012-05-24 | 2016-06-08 | 北汽福田汽车股份有限公司 | Fuel feed system, method and comprise the automobile of this system |
| CN103993965B (en) * | 2013-02-17 | 2017-08-04 | 西安友科电子科技有限公司 | A kind of LPG/CNG Double-fuels EFI control method |
| CN103174527B (en) * | 2013-03-21 | 2016-01-06 | 山东赛马力发电设备有限公司 | A kind of biogas or rock gas and gasoline dual-purpose motor |
| CN103195636B (en) * | 2013-03-21 | 2015-07-15 | 山东赛马力发电设备有限公司 | Adjustment method for angle of ignition advance of engine |
| DE102016206870B4 (en) * | 2016-04-22 | 2023-09-14 | Man Energy Solutions Se | Method and control device for operating an internal combustion engine |
| CN107461289B (en) * | 2017-08-24 | 2019-03-12 | 中国第一汽车股份有限公司 | The method of adjustment of the gasoline natural gas flexible fuel engine angle of ignition |
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| CN201184264Y (en) * | 2008-04-22 | 2009-01-21 | 陈虎声 | Ignition system of double-fuel motorcycle engine |
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| JP2007332814A (en) * | 2006-06-13 | 2007-12-27 | Nikki Co Ltd | Method and device for ignition control of gasoline alternate fuel engine |
| JP4795876B2 (en) * | 2006-07-07 | 2011-10-19 | 株式会社ニッキ | Ignition control method and apparatus for gasoline alternative fuel engine |
| JP4989281B2 (en) * | 2007-04-10 | 2012-08-01 | 株式会社ニッキ | Gas engine fuel supply method and gasoline alternative gas fuel injection control device |
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