CN103670757A - Variable frequency fuel injection method for engine - Google Patents
Variable frequency fuel injection method for engine Download PDFInfo
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- CN103670757A CN103670757A CN201410006381.4A CN201410006381A CN103670757A CN 103670757 A CN103670757 A CN 103670757A CN 201410006381 A CN201410006381 A CN 201410006381A CN 103670757 A CN103670757 A CN 103670757A
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Abstract
The invention discloses a variable frequency fuel injection method for an engine, relates to a novel fuel injection method for the engine and belongs to the technical field of the engine. In the variable frequency fuel injection method for the engine, on the basis that an electronic control unit (ECU) detects variation of running state parameters of the engine (comprising a gas intake, a rotating speed, a load, a temperature, content of oxygen in exhausted gas and the like of the engine) according to various sensors so as to determine injection timing and a fuel injection quantity, control is carried out by the ECU and every when fuel is injected for N times, fuel injection is stopped for once. By reducing the fuel injection frequency, not only is the requirement for an idling speed of the engine or the requirement for power of the engine met, but also fuel consumption of the engine can be reduced. The variable frequency fuel injection method can be widely applied to a gasoline engine and a diesel engine. The engine adopting the variable frequency fuel injection method can be named a variable frequency engine.
Description
Technical field
The technical field of the invention is motor.
Background technique
At present, gasoline, diesel engine generally adopt electric control fuel oil jet system.Electric control fuel oil jet system adopts all-electronin control mode, ECU (Electrical Control Unit) (ECU) detects the variation of (comprising content of oxygen in air inflow, rotating speed, load, temperature and the exhaust of motor etc.) of motor operation conditions parameter according to various sensors, again by ECU according to input signal process, analysis and computing determine required fuel injection amount, and control by controlling the opening time of oil sprayer the every circulating fuel injection quantity spraying in cylinder, and then reach the object of inflammable mixture air fuel ratio being carried out to accurate control.The function of electric control fuel oil jet system be mainly to injection timing, fuel injection quantity, fuel oil stop for and fuel pump control.
Motor has a key property, i.e. the power of motor output and the rotating speed of moment of torsion and motor exist corresponding relation.The rotating speed of motor of take is abscissa, and power and the moment of torsion of motor of take is y coordinate, can form motor characteristic curve figure.The characteristic curve of motor has two, and one is power curve, and another is torque curve.General power curve is steeper, and this power that shows motor sharply rises along with the raising of rotating speed, and the magnitude of power that its summit is corresponding is " peak output " marking in engine technology parameter.
Automobile (comprising gasoline locomotive, diesel locomotive, lower same) in the process of moving, needs different engine power or moment of torsion, and this just needs gearbox that suitable power or moment of torsion are offered to automobile.Gearbox also has a function, utilizes exactly neutral, interrupts transmission of power, with motor can start, idling, and be convenient to shifting of transmission or carry out power output.
Electronic fuel injection engine is divided eight kinds of operating modes substantially: after starting, starting, warming-up, idling, sub load, full load, transition, holder be moving.Various operating modes are completely by computer monitoring and controlling.Motor operates mainly in idling, sub load, full load mode.Under idling operation, engine control, at certain rotating speed, prevents that shake from appearring in motor.Under sub load, full load mode, motor is by gearbox, drive shaft automobile running.
Comprehensively the above, during engine idling condition, only relevant with engine speed, to keep motor not shake, irrelevant with engine output; When sub load, full load mode, under a certain gear, a certain rotating speed, engine output is greater than the power that automobile running needs, and particularly, when high rotating speed, low grade, output power, much larger than demand power, causes energy dissipation.
In order to overcome the above problems, idling flameout system, cylinder-variable technology, oil electric mixed dynamic system etc. have been developed.Idling flameout system object is to reduce vehicle idling to waste fuel oil when static, car speed be zero or approach zero, during temporary transient parking the such as brake slams, motor stops working with fuel saving.When decontroling brake, driver prepares to step on the gas before starting, engine restart.The method increases certain cost, and air-conditioning system cannot be provided when idling flameout.Cylinder-variable technology, mainly for large discharge capacity automobile, solves automobile when urban road low speed driving, the problem that engine load rate is low, oil consumption is high, but be not promoted due to less economical.Hybrid vehicle can be saved fuel oil significantly, but cost is high, is at present popularization period.
Summary of the invention
The present invention relates to a kind of new engine fuel injection method, i.e. motor variable-frequency oil injection method.By reducing oil burning jet radio frequency, both met engine idle rotating speed needs or engine power demand, can reduce engine fuel consumption again.
Motor variable-frequency oil injection method, in ECU (Electrical Control Unit) (ECU), according to various sensors, detecting motor operation conditions parameter (comprising the content of oxygen in air inflow, rotating speed, load, temperature and the exhaust of motor etc.) changes, determine on the basis of injection timing, fuel injection quantity, by ECU (Electrical Control Unit) (ECU), control, N time (N is positive integer in every oil spout, general value is 1-100), stop oil spout 1 time.N is parameter, according to engine operating condition, and the situation such as engine speed, gearbox-gear, motor characteristic curve, rationally determine.
The motor that adopts variable-frequency oil injection method, can be called frequency conversion motor.
Embodiment
Variable-frequency oil injection method, can be widely used in petrol engine and diesel engine, is mainly used in engine idling condition, partial load condition, full load mode.
Implement motor variable-frequency oil injection method, on existing basis, only ECU (Electrical Control Unit) (ECU) program is modified, need not increase any hardware device.In ECU (Electrical Control Unit) (ECU), determine on the basis of injection timing, fuel injection quantity according to original program, according to the N value under motor place operating mode and speed conditions, by ECU (Electrical Control Unit) (ECU), control, every oil spout N time, stops oil spout 1 time.
During engine idling condition, can be determined by experiment N value.First the N value under different idling speed under motor steady state is determined in experiment, the fuel consumption of its unit time under different idling speed when experiment adopts variable-frequency oil injection method again, choose unit time fuel consumption idling speed and N value hour, the N value while spraying as the idling speed of this motor reality and fuel oil.During N value when different idling speed under motor steady state is determined in experiment, first a definite idling speed (being more than or equal to original idling speed), chooses a N value initial value, and such as 10, whether test engine is shaken.If do not shaken, this value is subtracted to 1, continue experiment, until motor shake.The value that minimum motor is not shaken is N value; If motor shake, adds 1 by this value, continue experiment, until motor is not shaken, this value is N value.
When engine section load, full load mode, the N value while determining in accordance with the following methods different engine under the gear that respectively advances.When a certain forward gears, the demand power of automobile while first determining a certain engine speed, contrast again power curve in motor characteristic curve, poor by this value divided by power corresponding to this engine speed in power curve and demand power, obtain a ratio, add 1 and round again, the N value while being this engine speed.Equally, the N value in the time of can obtaining when this forward gears different engine.By that analogy, the N value in the time of can obtaining different forward gears, under different engine.
Variable-frequency oil injection method be mainly applicable to automobile at the uniform velocity, slow down, the state that gives it the gun slowly, be not generally suitable for anxious acceleration mode and climbing state.At the state that gives it the gun slowly, need to suitably adjust N value, generally strengthen N value, improve engine output.
Claims (4)
1. motor variable-frequency oil injection method, in ECU (Electrical Control Unit) (ECU), according to various sensors, detecting motor operation conditions parameter (comprising the content of oxygen in air inflow, rotating speed, load, temperature and the exhaust of motor etc.) changes, determine on the basis of injection timing, fuel injection quantity, by ECU (Electrical Control Unit) (ECU), control, N time (N is positive integer in every oil spout, general value is 1-100), stop oil spout 1 time.
2. according to claim 1, during engine idling condition, can be determined by experiment N value: first the N value under different idling speed under motor steady state is determined in experiment, the fuel consumption of its unit time under different idling speed when experiment adopts variable-frequency oil injection method again, choose unit time fuel consumption idling speed and N value hour, the N value while spraying as the idling speed of this motor reality and fuel oil.
3. according to claim 1, during N value when different idling speed under motor steady state is determined in experiment, first determine an idling speed (being more than or equal to original idling speed), choose a N value initial value, such as 10, whether test engine is shaken: if do not shaken, this value is subtracted to 1, continue experiment, until motor shake, the value that minimum motor is not shaken is N value; If motor shake, adds 1 by this value, continue experiment, until motor is not shaken, this value is N value.
4. according to claim 1, when engine section load, full load mode, N value while determining in accordance with the following methods different engine under the gear that respectively advances: when a certain forward gears, the demand power of automobile while first determining a certain engine speed, contrast power curve in motor characteristic curve, poor by this value divided by power corresponding to this engine speed in power curve and demand power, obtains a ratio again, add 1 and round again, the N value while being this engine speed; Equally, the N value in the time of can obtaining when this forward gears different engine; Repeat said process, the N value in the time that different forward gears can being obtained, under different engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410006381.4A CN103670757A (en) | 2014-01-07 | 2014-01-07 | Variable frequency fuel injection method for engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410006381.4A CN103670757A (en) | 2014-01-07 | 2014-01-07 | Variable frequency fuel injection method for engine |
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| CN103670757A true CN103670757A (en) | 2014-03-26 |
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| CN201410006381.4A Pending CN103670757A (en) | 2014-01-07 | 2014-01-07 | Variable frequency fuel injection method for engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454188A (en) * | 2014-10-30 | 2015-03-25 | 长城汽车股份有限公司 | Gasoline injection amount control method and system for dual-fuel engine |
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| CN1054814A (en) * | 1990-01-05 | 1991-09-25 | 西门子公司 | The idle running of two-stroke fuel-injected multi-cylinder internal combustion engine and non-idling operation |
| CN1888407A (en) * | 2006-07-23 | 2007-01-03 | 燕山大学 | Electrojet engine variable working displacement control technique |
| CN101397938A (en) * | 2007-09-26 | 2009-04-01 | 通用汽车环球科技运作公司 | Method and control architecture for optimization of cylinder deactivation selection and engine input torque for a hybrid powertrain system |
| CN101718230A (en) * | 2008-10-09 | 2010-06-02 | 通用汽车环球科技运作公司 | Method to control fuel injector pulsewidth in a compression-ignition engine |
| CN201581998U (en) * | 2010-01-18 | 2010-09-15 | 李发均 | Variable-frequency oil-supply device for adjusting power of engine |
| CN102817722A (en) * | 2012-08-07 | 2012-12-12 | 杭州电子科技大学 | Load control method for reducing cylinders of diesel engine |
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2014
- 2014-01-07 CN CN201410006381.4A patent/CN103670757A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054814A (en) * | 1990-01-05 | 1991-09-25 | 西门子公司 | The idle running of two-stroke fuel-injected multi-cylinder internal combustion engine and non-idling operation |
| CN1888407A (en) * | 2006-07-23 | 2007-01-03 | 燕山大学 | Electrojet engine variable working displacement control technique |
| CN101397938A (en) * | 2007-09-26 | 2009-04-01 | 通用汽车环球科技运作公司 | Method and control architecture for optimization of cylinder deactivation selection and engine input torque for a hybrid powertrain system |
| CN101718230A (en) * | 2008-10-09 | 2010-06-02 | 通用汽车环球科技运作公司 | Method to control fuel injector pulsewidth in a compression-ignition engine |
| CN201581998U (en) * | 2010-01-18 | 2010-09-15 | 李发均 | Variable-frequency oil-supply device for adjusting power of engine |
| CN102817722A (en) * | 2012-08-07 | 2012-12-12 | 杭州电子科技大学 | Load control method for reducing cylinders of diesel engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454188A (en) * | 2014-10-30 | 2015-03-25 | 长城汽车股份有限公司 | Gasoline injection amount control method and system for dual-fuel engine |
| CN104454188B (en) * | 2014-10-30 | 2017-12-26 | 长城汽车股份有限公司 | Dual fuel engine gasoline injection amount control method and control system |
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Application publication date: 20140326 |
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