CN102094734B - Cold starting system of fuel direct injection engine and starting method thereof - Google Patents
Cold starting system of fuel direct injection engine and starting method thereof Download PDFInfo
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- CN102094734B CN102094734B CN2010106056286A CN201010605628A CN102094734B CN 102094734 B CN102094734 B CN 102094734B CN 2010106056286 A CN2010106056286 A CN 2010106056286A CN 201010605628 A CN201010605628 A CN 201010605628A CN 102094734 B CN102094734 B CN 102094734B
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Abstract
The invention relates to a cold starting system of a fuel direct injection engine and a starting method thereof in the technical field of engines. The system comprises an electronic control unit, a sensor, a direct injection fuel oil injector, a heating block and a large-angle variable valve timing mechanism, wherein the heating block is positioned on the fuel oil pipeline of the engine; the large-angle variable valve timing mechanism is fixedly arranged at one end of the camshaft of the engine and connected with a timing belt; the sensor is fixedly arranged on the cylinder body of the engine; the direct injection fuel oil injector is fixedly arranged on the top of the combustion chamber of the engine; and the electronic control unit is connected with the output end of the sensor, the control end of the direct injection fuel oil injector, the control end of the large-angle variable valve timing mechanism and the control end of the heating block respectively so as to receive analogue sensing information and output digital electrical level control commands respectively. The variable valve timing mechanism is combined, and a fuel preheating technology and an injection backpressure lowering technology are used, so that the economical performance and emission performance of the engine are greatly improved.
Description
Technical field
What the present invention relates to is a kind of device and controlling method of technical field of engines, specifically is a kind of cold starting system and startup method thereof of direct fuel-injection engine.
Background technique
Under global oil price constantly skyrockets background with increasing environmental pollution, thereby in order to reduce the energy security that the dependence of fossil fuel is guaranteed country, a lot of countries drop into lot of manpower and material resources and are developing fuel for use.Wherein, from cost and point of view of application, flexible fuel in short-term provide one the cover soluble scheme.So-called flexible fuel is meant in gasoline and adds certain density Aalcohols fuel, adds Aalcohols fuel normally methyl alcohol or ethanol in the gasoline to.At present, soaring day by day along with international oil price, the cost of Aalcohols fuel is much smaller than the cost of gasoline; And the China's oil deposit is abundant, thereby the use of alcohols substitute fuel will alleviate the fuel feeding situation of China's growing tension, and Aalcohols fuel is owing to contain oxygen; It is more complete to burn; Harmful matter is significantly less than Fuel Petroleum, adapt to the long-term energy-conserving and environment-protective policy of country, so Aalcohols fuel has wide popularizing prospect in China.External employed Aalcohols fuel is all to be the ethanol that in gasoline, adds in various degree mostly at present; For example in the U.S. and Brazil; In gasoline, all add Different concentrations of alcohol; The content of the ethanol in these fuel is crossed over very big scope (15% ethanol～85% ethanol does not wait), and the fuel discrimination system that starts accordingly also can be told the content of ethanol in the gasoline.In China, because the various places resource is different, thereby the emphasis of each place government work is also different; In the agriculture developed regions of part such as northeast, Guangxi etc., because crops and relevant derived product such as stalk etc. are abundanter, thereby it is main to promote alcohol fuel; And in Shanxi, ground such as Shaanxi, Anhui because rich coal resources, thereby methanol output is big and cost is low; Thereby be main to promote methyl alcohol, this shows that the Aalcohols fuel of following China will be the situation of methyl alcohol and ethanol coexistence.Yet Aalcohols fuel relative conventional gasoline fuel under the situation of engine cold-start has the problem that is difficult to evaporate atomizing, causes its cold starting performance bad, influences its Economy and emission performance.
Retrieval through to the existing technology document is found, Chinese patent document number CN101440750A, and open day 2009-5-27 has put down in writing a kind of " alcohol fuel automobile cold starting system ", and the oil sprayer injected petrol is set on closure, realizes cold start-up in this way; Chinese patent document number CN101382089A; Publication number 2009-3-11; Put down in writing a kind of " flexible fuel engine control system and controlling method "; Adopt the bimodulus control strategy, motor switches back-steam oil spurts pattern realization cold start-up when cold start-up, sprays at the next employing Aalcohols fuel of nominal situation.But above technology only is the cold starting system to the intake port injection flexible fuel engine.Can not solve the cold start-up problem of flexible fuel direct fuel-injection engine.And above technology all need increase by a cover auxiliary fuel system, has increased cost.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that existing technology exists; A kind of cold starting system and startup method thereof of direct fuel-injection engine are provided; Preheat through fuel, reduce the straight spray control strategy that flexible fuel sprays back pressure and combines sectional ejecting, optimized the atomizing of flexible fuel; Improved combustion characteristic greatly at cold start-up stage motor; Having solved the problem of the cold start-up difficulty of flexible fuel, and need not increase extra auxiliary fuel system, is a kind of effective low-cost solution.
The present invention realizes through following technological scheme:
The present invention relates to a kind of cold starting system of direct fuel-injection engine; Comprise: electronic control unit, sensor, straight injection injector, heat block and wide-angle VVT gear; Wherein: heat block is positioned on the fuel pipe of motor; The wide-angle VVT gear is fixedly set in camshaft one end of motor and is connected with Timing Belt; Sensor is fixedly set on the cylinder body of motor; Straight injection injector is fixedly set in the top of combustion chamber of motor, and electronic control unit is connected to receive analog sensed information and to export the digital level control command respectively with the control end of the output terminal of sensor, straight injection injector, the control end of wide-angle VVT gear and the control end of heat block respectively.
Described electronic control unit comprises: singlechip chip and peripheral drive circuit; Wherein: singlechip chip is connected with peripheral drive circuit to receive digital sensing information and output logic control command; Peripheral drive circuit respectively in the future the analog sensed information of the output terminal of autobiography sensor be converted into digital sensing information, will be converted into the digital level control command from the logic control instruction of singlechip chip and export the control end of straight injection injector, the control end of wide-angle VVT and the control of heat block to.
The running parameter of described sensor acquisition motor also exports electronic control unit to the form of analogue signal.
Described heat block is annular resistive heater structure; This heating specifically is arranged at outside the fuel pipe soon heats fuel pipe, and said resistance wire is a sped structure, the annular aluminium block of its outer covering; This annular aluminium block internal diameter and fuel pipe external diameter are complementary, and external diameter is than the big 3cm of internal diameter.
Described wide-angle VVT gear receives the control signal of electronic control unit, and is converted into the angle variation of structure valve timing to control signal.
The present invention relates to the startup method of the cold starting system of above-mentioned direct fuel-injection engine, may further comprise the steps:
The first step, engine electric-controlled unit receive each sensor signal and determine whether to be the cold start-up operating mode, and when being the cold start-up operating mode, then engine electric-controlled unit sends SC sigmal control heat block heated fuel oil pipeline, and the fuel oil that will spray into the firing chamber is carried out preheating
Second step, utilize VVT control inlet and exhaust valve correct time, make IO Intake Valve Opens time lag, the exhaust valve closing time in advance.
The signal that the 3rd step, engine electric-controlled unit receiving sensor send carries out Treatment Analysis, controls the oil spout behind descent of piston of straight injection injector.
The 4th step, run to down solstice at piston, engine electric-controlled unit is controlled straight injection injector once more and is carried out oil spout.
The present invention is through installing the heat block system additional on fuel pipe, preheat getting into the fuel oil that oil sprayer sprays, and improves the fuel initial temperature that gets in the cylinder; Utilize variable inlet and exhaust valve timing system control inlet and exhaust valve correct time simultaneously, make intake valve open evening, exhaust valve early closes; Like this on the intake stroke near point, intake valve and exhaust valve be closing simultaneously, piston continues when descending; To form the confined space of a near vacuum in the cylinder, in-cylinder pressure is extremely low, implements the strategy of in-cylinder direct injection multi-injection simultaneously; In cylinder head oil sprayer is installed and is realized that fuel sprays, carry out the first time when promptly in piston has just begun descending cylinder, being near vacuum and spray, because fuel has passed through and preheated; And it is extremely low to spray back pressure, and fuel is easy to just evaporation atomizing in cylinder, has formed good spraying.But because this moment, piston was very low from cylinder head, be ejected into piston head, can only spray an amount of fuel in order to prevent fuel.Piston continue descending arrival down to some the time, carry out the second time of fuel and spray, compensation is the fuel deficiency of spraying for the first time.Make motor satisfy burden requirement.Through such cold starting system, combustion system of engine has obtained good optimization, has improved the Economy and the emission performance of motor greatly.
Owing to adopted such scheme, the good effect that the present invention had is:
1. this flexible fuel direct fuel-injection engine cold starting system adds oil bunkering and preheats system, has improved and has sprayed the fuel oil temperature that gets into cylinder, has promoted the atomization characteristics of flexible fuel.
2. the present invention has combined advanced VVT and motor direct injection technology, under the situation that does not increase any spare system, has reduced the injection back pressure effectively, has promoted the fuel atomizing characteristic.
3. the present invention has combined the strategy of flexible fuel multi-injection, makes air and fuel mix more even, has formed the more mixed gas of high-quality.
Description of drawings
Fig. 1 is a schematic representation of the present invention.
Fig. 2 sprays schematic representation for the first time for embodiment's cold start-up stage.
Fig. 3 sprays schematic representation for the second time for embodiment's cold start-up stage.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technological scheme of the present invention.
As shown in Figure 1; Present embodiment comprises: electronic control unit 1, wide-angle VVT gear 2, straight injection injector 3, heat block 4 and sensor 5; Wherein: heat block 4 is positioned on the fuel pipe 6 of motor; Wide-angle VVT gear 2 is fixedly set in camshaft one end of motor and is connected with Timing Belt; Sensor 5 is fixedly set on the cylinder body of motor; Straight injection injector 3 is fixedly set in the top of combustion chamber of motor, and electronic control unit 1 is connected to receive analog sensed information and to export the digital level control command respectively with the control end of the output terminal of sensor 5, straight injection injector 3, the control end of wide-angle VVT gear 2 and the control end of heat block 4 respectively.
Described electronic control unit 1 comprises: singlechip chip and peripheral drive circuit; Wherein: singlechip chip is connected with peripheral drive circuit to receive digital sensing information and output logic control command; Peripheral drive circuit respectively in the future the analog sensed information of the output terminal of autobiography sensor 5 be converted into digital sensing information, will be converted into the digital level control command from the logic control instruction of singlechip chip and export the control end of straight injection injector 3, the control end of wide-angle VVT gear 2 and the control end of heat block 4 to.
Described wide-angle VVT gear 2 receives the control signal of electronic control unit 1, and is converted into the angle variation of structure valve timing to control signal.
Described heat block 4 is annular resistive heater structure; This heating specifically is arranged at outside the fuel pipe soon heats fuel pipe, and said resistance wire is a sped structure, the annular aluminium block of its outer covering; This annular aluminium block internal diameter and fuel pipe external diameter are complementary, and external diameter is than the big 3cm of internal diameter.
Described sensor 5 is gathered the running parameter of motors and is exported electronic control unit 1 to the form of analogue signal.
This device is realized the startup method through following steps:
The signal that the first step, each sensor 5 of engine electric-controlled unit reception send determines whether to be the cold start-up operating mode; When being the cold start-up operating mode; Then engine electric-controlled unit sends SC sigmal control heat block 4 heated fuel oil pipelines, and the fuel oil that will spray into the firing chamber is carried out preheating
Second step, utilize VVT control inlet and exhaust valve correct time, make IO Intake Valve Opens time lag, the exhaust valve closing time in advance.
The signal that the 3rd step, each sensor 5 of engine electric-controlled unit reception send carries out Treatment Analysis, controls straight injection injector 3 in piston descending oil spout proper time soon just.
The 4th step, run to down solstice at piston, engine electric-controlled unit is controlled straight injection injector 3 once more and is carried out oil spout.
Like Fig. 2,, produce negative valve overlap through 3 control inlet and exhaust valve correct time of variable inlet and exhaust valve mechanism; Promptly exist a bit of interior inlet and exhaust valve to close simultaneously; Carry out the descending process of a bit of near vacuum in the cylinder, in cylinder, produce negative pressure, this moment, electronic control unit 1 sent the injection first time that control signal carries out fuel oil for straight injection injector 3; Promptly to spray back pressure very low and carry out preheating of fuel oil because in-cylinder pressure is very low; Make evaporation more easily under the fuel calibration reason condition, the fuel-oil atmozation of during this period of time carrying out spraying for the first time is all right, in cylinder, has formed good spraying.Because discharge time early, piston is very near from top dead center, and the amount of fuel of spraying in the control is during this period of time avoided spraying excessive fuel oil, makes that fuel oil is unlikely to be ejected on the piston head.
Like Fig. 3, intake stroke during near lower dead center electronic control unit 1 send the second time that control signal carries out fuel oil for straight injection injector 3 and spray, in order to the compensation deficiency of fuel injection amount for the first time, make the fuel oil total amount of this twice injection satisfy burden requirement.
Because VVT gear 3 has become the standard configuration of direct fuel-injection engine, this technology only need increase heat block 2, and cost is low.Preheat fuel and reduce the technology of spraying back pressure owing to utilized simultaneously, it is obvious that combustion system of engine is optimized effect.Make motor obtain lifting greatly aspect economical and the emission performance.
Claims (8)
1. the cold starting system of a direct fuel-injection engine; Comprise: electronic control unit, sensor, straight injection injector, heat block and wide-angle VVT gear; It is characterized in that: heat block is positioned on the fuel pipe of motor; The wide-angle VVT gear is fixedly set in camshaft one end of motor and is connected with Timing Belt; Sensor is fixedly set on the cylinder body of motor; Straight injection injector is fixedly set in the top of combustion chamber of motor, and electronic control unit is connected to receive analog sensed information and to export the digital level control command respectively with the control end of the output terminal of sensor, straight injection injector, the control end of wide-angle VVT gear and the control end of heat block respectively.
2. the cold starting system of direct fuel-injection engine according to claim 1; It is characterized in that; Described electronic control unit comprises: singlechip chip and peripheral drive circuit; Wherein: singlechip chip is connected with peripheral drive circuit to receive digital sensing information and output logic control command; Peripheral drive circuit respectively in the future the analog sensed information of the output terminal of autobiography sensor be converted into digital sensing information, will be converted into the digital level control command from the logic control instruction of singlechip chip and export the control end of straight injection injector, the control end of wide-angle VVT and the control end of heat block to.
3. the cold starting system of direct fuel-injection engine according to claim 1 is characterized in that, the running parameter of described sensor acquisition motor also exports electronic control unit to the form of analogue signal.
4. the cold starting system of direct fuel-injection engine according to claim 1 is characterized in that, described heat block is annular resistive heater structure, and this heat block specifically is arranged at outside the fuel pipe fuel pipe is heated.
5. the cold starting system of direct fuel-injection engine according to claim 4 is characterized in that, said resistance wire is a sped structure, the annular aluminium block of its outer covering.
6. the cold starting system of direct fuel-injection engine according to claim 5 is characterized in that, described annular aluminium block internal diameter and fuel pipe external diameter are complementary, and external diameter is than the big 3cm of internal diameter.
7. the cold starting system of direct fuel-injection engine according to claim 1 is characterized in that, described wide-angle VVT gear receives the control signal of electronic control unit, and is converted into the angle variation of structure valve timing to control signal.
8. the startup method according to the cold starting system of the described direct fuel-injection engine of above-mentioned arbitrary claim is characterized in that, may further comprise the steps:
The first step, engine electric-controlled unit receive each sensor signal and determine whether to be the cold start-up operating mode, and when being the cold start-up operating mode, then engine electric-controlled unit sends SC sigmal control heat block heated fuel oil pipeline, and the fuel oil that will spray into the firing chamber is carried out preheating;
Second step, utilize VVT control inlet and exhaust valve correct time, make IO Intake Valve Opens time lag, the exhaust valve closing time in advance;
The signal that the 3rd step, engine electric-controlled unit receiving sensor send carries out Treatment Analysis, controls the oil spout behind descent of piston of straight injection injector, carries out the first time when promptly in piston has just begun descending cylinder, being near vacuum and sprays;
The 4th step, run to down solstice at piston, engine electric-controlled unit is controlled straight injection injector once more and is carried out oil spout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106056286A CN102094734B (en) | 2010-12-24 | 2010-12-24 | Cold starting system of fuel direct injection engine and starting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106056286A CN102094734B (en) | 2010-12-24 | 2010-12-24 | Cold starting system of fuel direct injection engine and starting method thereof |
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| Publication Number | Publication Date |
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| CN102094734A CN102094734A (en) | 2011-06-15 |
| CN102094734B true CN102094734B (en) | 2012-11-28 |
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| CN104564206A (en) * | 2015-01-23 | 2015-04-29 | 吉林大学 | Cam-driven hydraulic fully variably valve mechanism of internal combustion engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000041078A (en) * | 1998-12-21 | 2000-07-15 | 김덕중 | Fuel supply system of direct injection type gasoline engine |
| JP2005098146A (en) * | 2003-09-22 | 2005-04-14 | Toyota Motor Corp | Fuel injection device of in-cylinder direct injection cng engine |
| JP2008138688A (en) * | 2008-01-28 | 2008-06-19 | Toyota Motor Corp | Fuel supply device for internal combustion engine |
| FR2910563A1 (en) * | 2006-12-22 | 2008-06-27 | Peugeot Citroen Automobiles Sa | Internal combustion engine e.g. direct injection oil engine, for motor vehicle, has intake and exhaust valves selectively closing combustion chamber, and rotating unit for modifying position of jets with respect to heating unit |
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2010
- 2010-12-24 CN CN2010106056286A patent/CN102094734B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000041078A (en) * | 1998-12-21 | 2000-07-15 | 김덕중 | Fuel supply system of direct injection type gasoline engine |
| JP2005098146A (en) * | 2003-09-22 | 2005-04-14 | Toyota Motor Corp | Fuel injection device of in-cylinder direct injection cng engine |
| FR2910563A1 (en) * | 2006-12-22 | 2008-06-27 | Peugeot Citroen Automobiles Sa | Internal combustion engine e.g. direct injection oil engine, for motor vehicle, has intake and exhaust valves selectively closing combustion chamber, and rotating unit for modifying position of jets with respect to heating unit |
| JP2008138688A (en) * | 2008-01-28 | 2008-06-19 | Toyota Motor Corp | Fuel supply device for internal combustion engine |
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