CN104879226A - Fuel control system for double-fuel engine of automobile - Google Patents

Fuel control system for double-fuel engine of automobile Download PDF

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Publication number
CN104879226A
CN104879226A CN201510253853.0A CN201510253853A CN104879226A CN 104879226 A CN104879226 A CN 104879226A CN 201510253853 A CN201510253853 A CN 201510253853A CN 104879226 A CN104879226 A CN 104879226A
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China
Prior art keywords
fuel
sensor
oil
gathering
engine
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Pending
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CN201510253853.0A
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Chinese (zh)
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贾亮
李惠林
范星光
曹博
范芳
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Guizhou University
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Guizhou University
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Priority to CN201510253853.0A priority Critical patent/CN104879226A/en
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Pending legal-status Critical Current

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Abstract

The invention discloses a fuel control system for a double-fuel engine of an automobile. The system comprises an original vehicle ECU and a fuel gas ECU which are connected by a communication manner, wherein the fuel gas ECU comprises an original vehicle oil injection signal acquiring device, an oil-gas switching device, an igniting signal acquiring device, a signal receiving device, a controller, an output device, and a sensor for acquiring the working state of the automobile; the original vehicle oil injection signal acquiring device, the igniting signal acquiring device, the oil-gas switching switch and the sensor are respectively connected with the signal receiving device; the signal receiving device is connected with the controller; the output device is connected with the controller; an original vehicle oil injection signal can be obtained from the original vehicle ECU. With the adoption of the system, the fuel oil/ fuel gas double-fuel engine modes can be switched smoothly, the oil input quantity/ oil input quantity can be effectively controlled; the air-fuel ratio can be relatively preferably selected.

Description

A kind of Fuel Control System of the duel fuel engine for automobile
Technical field
The invention belongs to technical field of automobile control, relate to a kind of automotive control system and supply system of duel fuel engine, particularly relate to a kind of machine oil and gas duel fuel engine automotive control system and supply system.
Background technique
Along with the development of World Economics, automobile oneself become people life in a kind of indispensable transport facility.Due to shortage and the too high oil price of petroleum resources, traditional automobile that is fuel with gasoline or diesel oil can not meet development need, fuel oil and combustion gas (CNG, LPG, oven gas etc.) dual-fuel automobile is superior with emission performance, user cost is low, the feature of good economical benefit more and more obtains people attention and welcome in the future.The performance of oil and gas duel fuel engine is decided by the accurate control to fuel gas injection amount, ignition energy and ignition advance angle to a great extent.Due to the greatest differences on fuel oil and combustion gas two kinds of fuel physicochemical properties, when carrying out oil-gas switch, following problem can be caused:
1, the control of air inflow (oil inlet quantity): because combustion gas itself occupies certain volume, when being switched to combustion gas from fuel oil, have the phenomenon be short of power; When being switched to fuel oil from combustion gas, then there will be again unexpected over-emitting black exhaust, the phenomenons such as power character is poor, engine knock.
2, " wet wall " effect: when motor is switched to combustion gas by fuel oil, due to " wet wall " effect, air inlet tube wall has one deck oil film, fuel cut-off transfer jet after, this oil film can enter cylinder combustion burn with air evaporation, increases gas quantity.On the contrary, when motor is switched to fuel oil by combustion gas, one deck oil film can be formed on air inlet tube wall, and can relatively reduce with the fuel oil that air enters in cylinder.
3, the control of air fuel ratio: during oil and gas duel fuel engine patten transformation, engine air-fuel ratio is difficult to control.
Therefore be the important development direction of engine electronic control technology to its automatical control system intellectual technology research.
Summary of the invention
The technical problem to be solved in the present invention is: the Fuel Control System providing a kind of duel fuel engine for automobile, when carrying out fuel oil and combustion gas switches, accurately can control emitted dose and the time for spraying of fuel oil (combustion gas), making engine mildness.
The object of the invention is to be achieved through the following technical solutions:
A kind of Fuel Control System of the duel fuel engine for automobile, comprise former car ECU and combustion gas ECU, described former car ECU is connected with communication mutual between combustion gas ECU, and described combustion gas ECU comprises former car fuel injection signal collecting device, oil-gas switch switch, ignition signal collection device, signal receiving device, controller, output unit and the sensor for gathering motor car engine operating state data; Described former car fuel injection signal collecting device, ignition signal collection device, oil-gas switch switch, sensor are connected with signal receiving device respectively; Described signal receiving device is connected with controller; Described output unit is connected with controller; Described former car fuel injection signal obtains from former car ECU, and described fire signal is drawn from the negative pole of spark coil, extracts electronic spark advance angle signal.
Preferably, described former car fuel injection signal collecting device comprises fuel injection pulsewidth signal collector, oil injection time signal picker.Former car fuel injection signal obtains from the output of former car ECU, can the signal of oil injection time signal and fuel injection pulsewidth from this signal.
Preferably, described sensor comprises gas burning system sensor, engine operating condition sensor and temperature transducer.
Preferably, described gas burning system sensor comprises: gaseous-pressure sensor, and for gathering the pressure data of combustion gas in air cylinder, time gaseous-pressure is inadequate, on instrument panel, tutorial light can light; And air inlet pressure sensor, for gathering the pressure data of the combustion gas in admission line.
Preferably, described engine operating condition sensor comprises: throttle position sensor, for gathering the aperture of closure and closing the data of situation, in order to control fuel injection quantity/jet amount, time of ignition and automatic gearbox gear shifting; Crankshaft position sensor, for gathering the data of engine crankshaft corner and piston top dead center, in order to control time of ignition (ignition advance angle) and injection timing, is also the signal source measuring engine speed simultaneously; Air flow sensor, for gathering the data thus the concentration of acquisition cylinder combustion gas that enter engine cylinder air amount size, in this, as the Main Basis calculating and control fuel injection quantity/jet amount; And lambda sensor, for gathering oxygen concentration data in tail gas thus judging the combustion position of motor and the working efficiency of catalyst converter.
Preferably, described temperature transducer comprises: for gathering the first temperature transducer of the coolant temperature data of motor; For gathering the second temperature transducer of the intake temperature data of blast nozzle; And for gathering the three-temperature sensor of the inner oil temperature data of speed changer.
Preferably, described output unit comprises magnetic valve controller, reduction valve control gear, ignition control device, blast nozzle control gear and oil nozzle control gear, and described magnetic valve controller, reduction valve control gear, ignition control device, blast nozzle control gear are connected with described controller respectively with the drive circuit of oil nozzle control gear.
Beneficial effect of the present invention: compared with prior art, a set of combustion gas ECU system is installed in the present invention additional on the basis of existing automobile, and both formation are cooperation control but also separate automotive fuel supply system not only mutually.When carrying out fuel oil and combustion gas switches, accurately can control the emitted dose of fuel oil (combustion gas) and the optimal control of time for spraying and air fuel ratio, making engine mildness smooth.
Accompanying drawing explanation
Fig. 1 is the fuel supply system schematic diagram of duel fuel engine of the present invention;
Fig. 2 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, invention is described further:
For a control system for the duel fuel engine of automobile, be applicable to the duel fuel engine of oil and gas type, the fuel supply system of the type motor comprises: the fuel oil supply system of gas supply system, combustion gas ECU, former car and former car ECU.Combustion gas ECU is connected with former car ECU communication, and both formation are cooperation control but also separate automotive fuel control system not only mutually.The oil supply system of former car comprises fuel tank, oil pump and oil nozzle, and described fuel tank, oil pump and oil nozzle are connected by pipeline, and former car oil supply system is controlled by former car ECU.Described gas supply system comprises air cylinder, solenoid valve, reduction valve, filter cleaner and blast nozzle, and described air cylinder, solenoid valve, reduction valve, filter cleaner are connected by pipeline successively with blast nozzle, and solenoid valve and reduction valve are controlled by combustion gas ECU.
For a control system for the duel fuel engine of automobile, comprise former car ECU and combustion gas ECU, described former car ECU is connected with communication between combustion gas ECU.Described combustion gas ECU comprises former car fuel injection signal collecting device, oil-gas switch switch, ignition signal collection device, signal receiving device, controller, output unit and the sensor for gathering motor car engine operating state data; Described former car fuel injection signal collecting device, ignition signal collection device, oil-gas switch switch, sensor are connected with signal receiving device respectively; Described signal receiving device is connected with controller; Described output unit is connected with controller.
The chip selection of described controller is Freescale MC9S12XEP100 chip, this chip is a microprocessor of 16 bit of motorola inc, the flash memories (Flash) of Embedded 1MB, the EEPROM of 4KB, the RAM of 64KB, the control of I/O and expansion capability, antijamming capability and adaptive capacity stronger, be integrated with many standard modules for automotive electronics function simultaneously, as 8 road serial communication interfaces (SCI), 3 tunnel serial device interfaces (SPI), 8 16, tunnel enhancement mode catch timer (ECT), 28, tunnels Abort Timer (PIT), 2 10, independence 16 tunnel analog-digital converters (ADC), 88, passage pulse width modulators (PWM), 5 road bus communications (CAN) etc.
Described fire signal is drawn from the negative pole of spark coil, extracts electronic spark advance angle signal.Described former car fuel injection signal collecting device comprises fuel injection pulsewidth signal collector, oil injection time signal picker.Former car fuel injection signal obtains from the output of former car ECU, can the signal of oil injection time signal and fuel injection pulsewidth from this signal.
Described sensor comprises gas burning system sensor, engine operating condition sensor and temperature transducer.
Gas burning system sensor comprises: gaseous-pressure sensor and air inlet pressure sensor.Gaseous-pressure sensor is arranged on the air cylinder of storage combustion gas, for gathering the pressure data of combustion gas in air cylinder, sends alarm signal when pressure is inadequate, and the tutorial light simultaneously on instrument panel lights; Air inlet pressure sensor, for gathering the pressure data of the combustion gas in admission line, is converted into the length that electrical signal controls electronic oil spout (jet) time after controller process.
Operating mode sensor comprises: throttle position sensor, crankshaft position sensor, air flow sensor and lambda sensor.Throttle position sensor is for gathering the aperture of closure and closing the data of situation, in order to control fuel injection quantity/jet amount, time of ignition and automatic gearbox gear shifting; Crankshaft position sensor, for gathering the data of engine crankshaft corner and piston top dead center, in order to control time of ignition (ignition advance angle) and injection timing, is also the signal source measuring engine speed simultaneously; Air flow sensor, for gathering the data thus the concentration of acquisition cylinder combustion gas that enter engine cylinder air amount size, in this, as the Main Basis calculating and control fuel injection quantity/jet amount; Lambda sensor is installed on automobile exhaust pipe, for gathering oxygen concentration data in tail gas thus judging the combustion position of motor and the working efficiency of catalyst converter.
Temperature transducer comprises: for gathering the first temperature transducer of the coolant temperature data of motor; For gathering the second temperature transducer of the intake temperature data of blast nozzle; And for gathering the three-temperature sensor of the inner oil temperature data of speed changer.
Described output unit comprises magnetic valve controller, reduction valve control gear, ignition control device, blast nozzle control gear and oil nozzle control gear, for control blast nozzle/oil nozzle jet/oil injection time, jet/fuel injection pulsewidth, jet/injection period and time of ignition, ensure motor stable working when fuel oil and combustion gas switch.

Claims (7)

1. for a Fuel Control System for the duel fuel engine of automobile, comprise former car ECU and combustion gas ECU, described former car ECU is connected with communication mutual between combustion gas ECU, it is characterized in that:
Described combustion gas ECU comprises former car fuel injection signal collecting device, oil-gas switch switch, ignition signal collection device, signal receiving device, controller, output unit and the sensor for gathering motor car engine operating state data;
Described former car fuel injection signal collecting device, ignition signal collection device, oil-gas switch switch, sensor are connected with signal receiving device respectively;
Described signal receiving device is connected with controller;
Described output unit is connected with controller;
Described former car fuel injection signal obtains from former car ECU.
2. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 1, is characterized in that: described former car fuel injection signal collecting device comprises fuel injection pulsewidth signal collector, oil injection time signal picker.
3. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 1, is characterized in that: described sensor comprises gas burning system sensor, engine operating condition sensor and temperature transducer.
4. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 3, is characterized in that: described gas burning system sensor comprises:
Gaseous-pressure sensor, for gathering the pressure data of combustion gas in air cylinder; And
Air inlet pressure sensor, for gathering the pressure data of the combustion gas in admission line.
5. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 3, is characterized in that: described engine operating condition sensor comprises:
Throttle position sensor, for gathering the aperture of closure and closing the data of situation;
Crankshaft position sensor, for gathering the data of engine crankshaft corner and piston top dead center;
Air flow sensor, for gathering the data thus the concentration of acquisition cylinder combustion gas that enter engine cylinder air amount size; And
Lambda sensor, for gathering oxygen concentration data in tail gas thus judging the combustion position of motor and the working efficiency of catalyst converter.
6. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 3, is characterized in that: described temperature transducer comprises:
For gathering the first temperature transducer of the coolant temperature data of motor;
For gathering the second temperature transducer of the intake temperature data of blast nozzle; And
For gathering the three-temperature sensor of the inner oil temperature data of speed changer.
7. the Fuel Control System of a kind of duel fuel engine for automobile according to claim 1, it is characterized in that: described output unit comprises magnetic valve controller, reduction valve control gear, ignition control device, blast nozzle control gear and oil nozzle control gear, described magnetic valve controller, reduction valve control gear, ignition control device, blast nozzle control gear are connected with described controller respectively with the drive circuit of oil nozzle control gear.
CN201510253853.0A 2015-05-19 2015-05-19 Fuel control system for double-fuel engine of automobile Pending CN104879226A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105927406A (en) * 2016-05-04 2016-09-07 山东大学 Multi-point gas electric control spraying system and method based on pressure-time control
CN105927377A (en) * 2016-05-03 2016-09-07 胡和萍 Novel dual-fuel engine
CN108894884A (en) * 2018-06-29 2018-11-27 日照圣树电子科技有限公司 Automobile multi fuel supplies full-automatic control system and its control method
CN111412088A (en) * 2019-01-07 2020-07-14 郑州大学 Gas injection device of gas fuel engine and control method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146853A (en) * 2011-03-29 2011-08-10 重庆长安汽车股份有限公司 Control system for natural gas/gasoline dual-fuel engine
CN202031727U (en) * 2011-04-29 2011-11-09 河北中兴汽车制造有限公司 Electric control multipoint sequential gas injection and supply system
CN202266335U (en) * 2011-10-24 2012-06-06 河北长安汽车有限公司 Gas control system for dual-fuel automobile
CN104153894A (en) * 2014-09-05 2014-11-19 杭州易随科技有限公司 Fuel gas dual-fuel electrical control device with fuel gas leakage alarm function, and fuel gas leakage detection and alarming method
CN204610047U (en) * 2015-05-19 2015-09-02 贵州大学 A kind of Fuel Control System of the duel fuel engine for automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146853A (en) * 2011-03-29 2011-08-10 重庆长安汽车股份有限公司 Control system for natural gas/gasoline dual-fuel engine
CN202031727U (en) * 2011-04-29 2011-11-09 河北中兴汽车制造有限公司 Electric control multipoint sequential gas injection and supply system
CN202266335U (en) * 2011-10-24 2012-06-06 河北长安汽车有限公司 Gas control system for dual-fuel automobile
CN104153894A (en) * 2014-09-05 2014-11-19 杭州易随科技有限公司 Fuel gas dual-fuel electrical control device with fuel gas leakage alarm function, and fuel gas leakage detection and alarming method
CN204610047U (en) * 2015-05-19 2015-09-02 贵州大学 A kind of Fuel Control System of the duel fuel engine for automobile

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105927377A (en) * 2016-05-03 2016-09-07 胡和萍 Novel dual-fuel engine
CN105927406A (en) * 2016-05-04 2016-09-07 山东大学 Multi-point gas electric control spraying system and method based on pressure-time control
CN105927406B (en) * 2016-05-04 2018-09-28 山东大学 Multi-point gas electric-controlling injection system and method based on pressure versus time control
CN108894884A (en) * 2018-06-29 2018-11-27 日照圣树电子科技有限公司 Automobile multi fuel supplies full-automatic control system and its control method
CN111412088A (en) * 2019-01-07 2020-07-14 郑州大学 Gas injection device of gas fuel engine and control method
CN111412088B (en) * 2019-01-07 2023-10-20 郑州大学 Gas injection device of gas fuel engine and control method

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Application publication date: 20150902

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