CN102174912B - Natural gas/gasoline nozzle selection device for double fuel engine - Google Patents
Natural gas/gasoline nozzle selection device for double fuel engine Download PDFInfo
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- CN102174912B CN102174912B CN2011100766587A CN201110076658A CN102174912B CN 102174912 B CN102174912 B CN 102174912B CN 2011100766587 A CN2011100766587 A CN 2011100766587A CN 201110076658 A CN201110076658 A CN 201110076658A CN 102174912 B CN102174912 B CN 102174912B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a natural gas/gasoline nozzle selection device for a double fuel engine. The device is divided into a plurality of groups of which the number corresponds to that of cylinders of the engine; each group of devices comprise a relay, a gasoline nozzle and a gas nozzle; the common negative electrode end of a gasoline nozzle electromagnetic valve and a gas nozzle electromagneticvalve in each group is controlled by a pin of an electronic control unit (ECU) of a double fuel engine control system; the other end of the gasoline nozzle electromagnetic valve and the other end of the gas nozzle electromagnetic valve are controlled by a normally-opened contact or a normally-closed contact of the relay respectively; and one end of a relay coil is connected with voltage, and the other end of the relay coil is controlled by the pin of the ECU. Whether the double fuel engine control system is communicated with the gasoline nozzle or the gas nozzle is selected through the switch-on and the switch-off of the relay coil, and the pulse width of the gasoline nozzle or the gas nozzle is determined by the grounding time of the common end of the gasoline nozzle electromagnetic valve and the gas nozzle electromagnetic valve. By the device, a fuel oil/fuel gas signal of the double fuel engine control system is output by one circuit, and the natural gas nozzle or the gasoline nozzle is selectively switched on, so that the modification amount of the original gasoline engine can be reduced; and the device has a simple structure and saves cost.
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 nozzle selection technology of duel fuel engine.
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 has been stored control logic under the gasoline pattern and the control logic under the rock gas pattern as shown in Figure 1 among the main control chip MCU of ECU; 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 to former petrol engine ECU hardware circuit, the cost height, and the storage code amount among the duel fuel engine list ECU is doubled, and memory consumption is big, and operational efficiency reduces.And if be optimized by the control logic to ECU, set up injection pulse width correcting logic and ignition timing correcting logic on the basis of former fuel oil control logic, under the combustion gas state, directly fuel pulsewidth and fuel injection pulsewidth correction are combustion gas pulsewidth and the output of jet pulse width signal, make the oil and gas signal share the output of one road circuit, can simplify existing double fuel ECU logic drive circuit, promote and drive efficient, few to existing petrol engine circuit change, reduce development cost.But if the jet pulse width signal of its output is not having can not directly to output to nozzle under the further situation of selecting to handle, thus, the improved control system of this kind needs further rock gas and petrol jet to be inserted the selection processing.
Summary of the invention
For overcoming the above-mentioned problems in the prior art, the present invention proposes the natural gas/gasoline nozzle selection device of duel fuel engine, at the duel fuel engine control system of setting up injection pulse width correcting logic and ignition timing correcting logic on the basis of former fuel oil control logic, after satisfying shared one road circuit output of its oil and gas signal, the selection of natural gas/gasoline nozzle is connected.
The present invention is specifically by the following technical solutions:
A kind of natural gas/gasoline nozzle selection device of duel fuel engine, described device are connected the selection of rock gas or petrol jet after being used for shared one road circuit output of oil and gas signal of duel fuel engine control system.Described natural gas/gasoline nozzle selection device is divided into many groups, and is corresponding with the cylinder number of motor; Each group all comprises a relay, an oil nozzle and a blast nozzle; Wherein, the common port of oil nozzle solenoid valve and blast nozzle solenoid valve is by the pin control of the ECU of duel fuel engine control system, the other end of oil nozzle solenoid valve and blast nozzle solenoid valve is respectively by relay normally open or normally-closed contact control, one termination voltage of relay coil, the other end is by pin control of ECU; Whether described duel fuel engine control system selects to be communicated with oil nozzle or blast nozzle by the energising of relay coil, by ground connection time decision fuel oil and/or the fuel gas injection pulsewidth of oil nozzle and blast nozzle solenoid valve common port.
The present invention is applied in the duel fuel engine control system, selects oil nozzle or blast nozzle with relay, and the drive circuit driving blast nozzle with former oil nozzle can reduce the change amount to former petrol engine, and is simple in structure, saves cost.And the pin of usefulness ECU is controlled the common port of oil nozzle spray or blast nozzle, under ECU pin condition of limited, can improve the utilization ratio of ECU pin.
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 the injection pulse width correction module;
Fig. 5 is the ignition timing correction module.
Embodiment
The present invention is described further below in conjunction with Figure of description.
Fig. 3 is the natural gas/gasoline selection device that the present invention proposes, and present embodiment is at four cylinder engine, and each cylinder is by one group of device, and one group comprises a relay 4, an oil nozzle and a 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.
Fig. 2 is the duel fuel engine control system block diagram that adopts apparatus of the present 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 the injection pulse width correcting logic of natural gas supply system, sensor, natural gas/gasoline selection device, rock gas and ignition timing correcting logic etc., and natural gas supply system adopts existing mature technology.Sensor signal comprises former petrol engine sensor signal and newly-increased sensor signal, the sensor that increases newly comprises rock gas request switching signal, rock gas air cylinder pressure signal, fuel gas temperature sensor signal, decompressor temperature sensor signal etc., has increased injection pulse width correction module 1, ignition timing correction module 2 etc. in the main control chip MCU of ECU.Former petrol engine sensor and the sensor signal that increases newly are exported to main control chip MCU after signal processing circuit is handled, whether main control chip MCU switches to the rock gas state according to signal determinings such as driver's operation request switch, engine cooling water temperature, CNG gas cylinder gas-storing capacity, engine speed.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.
Wherein injection pulse width correction module 1 comprises rock gas, two kinds of patterns of gasoline injection pulse width, if be in the gasoline pattern, the injection pulse width of injection pulse width correction module 1 output is the fuel oil injection pulse width; If be in the rock gas pattern, the injection pulse width of injection pulse width correction module 1 output is the natural gas injection pulsewidth.
The ignition timing of ignition timing correction module 2 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.
Fig. 4 is the injection pulse width correction module of said system, 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
Tg is the natural gas injection pulsewidth, k is natural gas injection pulse width conversion coefficient, k1 is the decompressor temperature compensation coefficient, k2 natural gas temperature penalty coefficient, k3 gas pressure penalty coefficient, tp are the gasoline injection pulse widths, rpm is the rotating speed of motor, Tr is the decompressor temperature, and Tg is natural gas temperature, and Pg is gas pressure.
Under the rock gas pattern, ECU obtains rock gas pulse width conversion coefficient k according to gasoline injection pulse width tp and rotating speed rpm inquiry, inquiry obtains decompressor temperature compensation coefficient k1 according to decompressor temperature signal Tr, inquiry obtains natural gas temperature penalty coefficient k2 according to natural gas temperature Tg, and inquiry obtains gas pressure penalty coefficient k3 according to different jet pressures poor (rock gas gas rail pressure Pg and suction pressure MAP's is poor).Natural gas injection pulse width conversion coefficient k, decompressor temperature compensation coefficient k1, natural gas temperature penalty coefficient k2, gas pressure penalty coefficient k3 carry out the engine pedestal rating test under different rotating speeds, load, 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. 5 is the ignition timing correction module of said system, 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.Wherein 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.
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 (1)
1. the natural gas/gasoline nozzle selection device of a duel fuel engine, at the duel fuel engine control system of setting up injection pulse width correcting logic and ignition timing correcting logic on the basis of former fuel oil control logic, described device is connected the selection of rock gas or petrol jet after being used for shared one road circuit output of oil and gas signal of duel fuel engine control system; It is characterized in that: described natural gas/gasoline nozzle selection device is divided into many groups, and is corresponding with the cylinder number of motor; Each group all comprises a relay, an oil nozzle and a blast nozzle; Wherein, the oil nozzle solenoid valve of each group and the common port of blast nozzle solenoid valve are by the pin control of the ECU of duel fuel engine control system, the other end of oil nozzle solenoid valve and blast nozzle solenoid valve is respectively by relay normally open or normally-closed contact control, one termination voltage of relay coil, the other end is by pin control of ECU; Whether described duel fuel engine control system selects to be communicated with oil nozzle or blast nozzle by the energising of relay coil, and oil nozzle and blast nozzle solenoid valve common port are by pin control fuel oil and/or the fuel gas injection pulsewidth of connected ECU.
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| CN2011100766587A CN102174912B (en) | 2011-03-29 | 2011-03-29 | Natural gas/gasoline nozzle selection device for double fuel engine |
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| CN2011100766587A CN102174912B (en) | 2011-03-29 | 2011-03-29 | Natural gas/gasoline nozzle selection device for double fuel engine |
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| CN102174912B true CN102174912B (en) | 2013-09-11 |
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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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