CN101900029B - Dual-fuel engine - Google Patents

Dual-fuel engine Download PDF

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Publication number
CN101900029B
CN101900029B CN201010246452XA CN201010246452A CN101900029B CN 101900029 B CN101900029 B CN 101900029B CN 201010246452X A CN201010246452X A CN 201010246452XA CN 201010246452 A CN201010246452 A CN 201010246452A CN 101900029 B CN101900029 B CN 101900029B
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Prior art keywords
fuel engine
fuel
sprocket wheel
oil
duel fuel
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CN101900029A (en
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秦慧永
黄振宇
王安民
李亚南
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Chery Automobile Co Ltd
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SAIC Chery Automobile Co Ltd
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Abstract

The invention provides a dual-fuel automobile engine applied to the field of engines. The dual-fuel engine comprises a cam shaft (1), a high-pressure oil rail (7) and a piston connecting rod mechanism (10). The dual-fuel engine also comprises a speed-reducing gear (3), a chain wheel I (5), a chain wheel II (6) and a driving gear (9). The driving gear (9) is connected with the cam shaft (1); the driving gear (9) and the chain wheel II (6) are arranged in a disconnected or connected mode; the speed-reducing gear (3) is engaged with the driving gear (9); and the speed-reducing gear (3) and the chain wheel I (5) are arranged in a disconnected or connected mode. Due to the adoption of the structure, the dual-fuel engine can consume gasoline or diesel to meet the different requirements on road conditions and power. Therefore, the dual-fuel engine can use the gasoline and the diesel as fuel, use the other kind of fuel when one kind of fuel is insufficient, prolong the continued mileage of vehicles and enhance the adaptivity of the vehicles to special environment.

Description

A kind of duel fuel engine
Technical field
The present invention relates to engine art, in particular, relate to a kind of dual-fuel automobile motor.
Background technique
At present, the motor car engine on the market is mainly divided two types, and one type is DENG; One type is petrol engine; Both fuel oils can not be used with each other, and body has all passed through very each self-optimizing of high level separately, so to different engine types; Can only use different fuel oils, also bring intrinsic separately pluses and minuses simultaneously:
The petrol engine thermal efficiency is low, and rotating speed is high, and oil consumption is high, and moment of torsion is little, is applicable to the urban road that road conditions are good; The diesel engine noise is big, and rotating speed is low, and oil consumption is low, and moment of torsion is big, is applicable to the mountain region road that road conditions are complicated;
Therefore, be devoted to study a kind of mixed fuel engine abroad always, can use pluralities of fuel; Advantage in conjunction with above-mentioned two types of motors; To different road conditions, different external environments is regulated structures such as oil-fired system, piston connecting bar system; Make a motor can combine diesel engine and petrol engine advantage separately, be applicable to multiple road conditions.Existing duel fuel engine fuel all is on the basis of petrol engine, to carry out little modification to cooperate fuel such as natural gas fuel or alcohols; Its objective is energy-conservation; But the result has lost power performance; Use its power performance of back and reduce a lot, can only be applicable to urban road among a small circle, and complicated mountain region road can't be used because of the restriction of power character.
Summary of the invention
Technical problem to be solved by this invention is: the deficiency to existing technology provides a kind of can the conversion to use gasoline or diesel oil, to be fit to the different road conditions and the duel fuel engine of power requirements.
Solve above-described technical problem, the technological scheme that the present invention takes is:
The present invention is a kind of duel fuel engine, comprises camshaft, high pressure oil rail; Piston crank mechanism, described duel fuel engine also comprises reduction gear, sprocket wheel I; Sprocket wheel II, actuation gear, described actuation gear is connected with camshaft; Actuation gear and sprocket wheel II are set to the connection breaking off, be connected, described reduction gear and actuation gear engagement, and described reduction gear and sprocket wheel I are set to the connection breaking off, be connected.
On the junction surface of described actuation gear and sprocket wheel II the concavo-convex structure that cooperates is set; On the junction surface of described reduction gear and sprocket wheel I the concavo-convex structure that cooperates is set; Described sprocket wheel I is connected with reduction gear through coupling shaft I; Described sprocket wheel II is connected with actuation gear through coupling shaft II, and hydraulic unit driver I and hydraulic unit driver II that the control connection shaft extension contracts are set respectively on described coupling shaft I and the coupling shaft II.
Described reduction gear is fixedly connected with deboost axle, and the groove I of yi word pattern is set on the deboost axle, and described coupling shaft I goes up the yi word pattern protruding structure I that is provided with the nested installation of groove I; The groove II of yi word pattern is set on the described actuation gear, and described coupling shaft II goes up the yi word pattern protruding structure II that is provided with the nested installation of groove II.
Described hydraulic unit driver I all is connected with its flexible hydraulic control system of control with hydraulic unit driver II.
On the high pressure oil oil rail of described duel fuel engine two Decompression valvess are set, are respectively high pressure relief valve and low pressure relief valve.
The piston crank mechanism of described duel fuel engine is set to the structure that compression ratio can change.
Described high pressure relief valve is that oil pressure is arranged on the structure between the 1200-2000bar, and described low pressure relief valve is that oil pressure is arranged on the structure between the 90-110bar.
Described piston crank mechanism is set to compression ratio variable structure between 9-18.
Adopt technological scheme of the present invention, can obtain following beneficial effect:
1, the objective of the invention is to design a mixed fuel engine, this motor can be through the change of associated mechanisms, use gasoline or diesel oil being fit to different road conditions and power requirementss, in conjunction with the advantage of petrol engine and DENG:
When good urban road goes, use gasoline, the performance petrol engine rotational speed is high, and moment of torsion is little, the advantage that the speed of a motor vehicle is high; Combustion diesel fuel when the complicated mountain region road driving of road conditions, the performance diesel engine speed is low, and moment of torsion is big, the advantage that the speed of a motor vehicle is low.
Motor of the present invention directly sprays into fuel oil in the cylinder, is difficult for detonation, has improved the antiknock quality of fuel; There is spark plug combustion-supporting simultaneously; Reduced the fuel fire performance demands; Therefore, motor of the present invention can use gasoline also can use diesel oil to act as a fuel, when adapting to a kind of therein fuel oil and lacking; Then use another kind of fuel oil, strengthen vehicle continuation of the journey mileage and to the adaptive capacity of particular surroundings.
The automobile of motor of the present invention is housed, can uses gasoline also can use diesel oil to act as a fuel, and the exchange of convenient two kinds of oil plants, the different compression ratio also can be regulated simultaneously, to use other fuel.
Description of drawings
The mark of facing down among expressed content of each accompanying drawing of this specification and the figure is made briefly bright:
Fig. 1 is the structural representation of duel fuel engine of the present invention;
Fig. 2 is the structure for amplifying schematic representation of part parts of the present invention;
Fig. 3 is the structural representation of high pressure oil rail of the present invention;
Fig. 4 is the structural representation of piston crank mechanism of the present invention;
Be labeled as among the figure: 1, camshaft; 2, deboost axle; 3, reduction gear; 4, hydraulic unit driver I; 5, sprocket wheel I; 6, sprocket wheel II; 7, high pressure oil rail; 8, hydraulic unit driver II; 9, actuation gear; 10, piston crank mechanism; 11, coupling shaft I; 12, coupling shaft II; 13, protruding structure I; 14, protruding structure II; 15, hydraulic control system; 16, high pressure relief valve; 17, low pressure relief valve; 18, groove I; 19, groove II.
A, cylinder; B, piston; C, connecting rod; D, bent axle; E, oil hydraulic cylinder; F, hydraulic piston; G, coupling sleeve; H, controlling rod; I, connecting rod; J, crank; K, firing chamber; L, piston latch.
Embodiment
Contrast accompanying drawing below; Through the description to embodiment, the effect of mutual alignment between the shape of specific embodiments of the invention such as related each member, structure, the each several part and annexation, each several part and working principle etc. are done further to specify:
Shown in accompanying drawing 1, the present invention is a kind of duel fuel engine, comprises camshaft 1, high pressure oil rail 7; Piston crank mechanism 10, described duel fuel engine also comprises reduction gear 3, sprocket wheel I 5; Sprocket wheel II 6, actuation gear 9, described actuation gear 9 is connected with camshaft 1; Actuation gear 9 and sprocket wheel II 6 are set to the connection breaking off, be connected, described reduction gear 3 and actuation gear 9 engagements, and described reduction gear 3 and sprocket wheel I 5 are set to the connection breaking off, be connected.
On the junction surface of described actuation gear 9 and sprocket wheel II 6 the concavo-convex structure that cooperates is set; On the junction surface of described reduction gear 3 and sprocket wheel I 5 the concavo-convex structure that cooperates is set; Described sprocket wheel I 5 is connected with reduction gear 3 through coupling shaft I 11; Described sprocket wheel II6 is connected with actuation gear 9 through coupling shaft II 12, and hydraulic unit driver I 4 and hydraulic unit driver II8 that the control connection shaft extension contracts are set respectively on described coupling shaft I 11 and the coupling shaft II 12.
Described reduction gear 3 is fixedly connected with deboost axle 2, and the groove I18 of yi word pattern is set on the deboost axle 2, and the yi word pattern protruding structure I 13 with groove I 18 nested installations is set on the described coupling shaft I 11; The groove II 19 of yi word pattern is set on the described actuation gear 9, the yi word pattern protruding structure II 14 with the nested installation of groove II19 is set on the described coupling shaft II 12.
Described hydraulic unit driver I 4 all is connected with its flexible hydraulic control system 15 of control with hydraulic unit driver II 8; Like this; When conversion connects petrol system or diesel systems, can realize through hydraulic control system 15 control hydraulic unit driver I 4 and the flexible of hydraulic unit driver II 8.
On the high pressure oil oil rail 7 of described duel fuel engine two Decompression valvess are set, are respectively high pressure relief valve 16 and low pressure relief valve 17.
The piston crank mechanism 10 of described duel fuel engine is set to the structure that compression ratio can change.
Described high pressure relief valve 16 is that oil pressure is arranged on the structure between the 1200-2000bar, and described low pressure relief valve 17 is that oil pressure is arranged on the structure between the 90-110bar.
Described piston crank mechanism 10 is set to compression ratio variable structure between 9-18.
As shown in Figure 4; Piston crank mechanism 10 of the present invention; It mainly is the overhang of controlling hydraulic piston f through an oil hydraulic cylinder e; And then control connecting rod i effective length partly in the mechanism of variable connecting rod effective length, also just changed the distance of centre, to reach the purpose that changes compression ratio to bent axle d center.
Whole system is made up of cylinder a, piston b, connecting rod c, bent axle d, oil hydraulic cylinder e, hydraulic piston f, coupling sleeve g.Wherein oil hydraulic cylinder e is fixed on the engine cylinder through a mandrel, but oil hydraulic cylinder e can freely rotate around mandrel, that is to say that hydraulic piston f can be that swing is done at the center with the mandrel, to such an extent as to whole system can normally rotate.When oil hydraulic cylinder e retracts a segment distance with hydraulic piston f toward in after; Controlling rod h among the connecting rod c is in the top dead center position at piston b; When putting, the angle of connecting rod c and engine spindle line (center line of piston just) will increase, and piston b center also can reduce to the distance at bent axle d center like this; Combustion chamber volume is increased, and the compression ratio of motor reduces.After oil hydraulic cylinder e outwards released a segment distance with controlling rod h, controlling rod h part reduced with the angle of engine spindle line or overlaps with it, and piston b center just increases to the centre distance of bent axle d like this, and combustion chamber volume is reduced, and the compression ratio of motor increases.The crux that present embodiment changes compression ratio is exactly, changes the effective length of controlling rod h, and then changed the distance of piston head to the cylinder cap lower plane, combustion chamber volume changed, the change of realization compression ratio.
For realizing the object of the invention, the present invention mainly revises following structure on the diesel engine prototype:
1, the variable-compression-ratio piston linkage mechanism is set, high compression ratio when guaranteeing burning diesel oil, low compression ratio during burns gasoline; This mechanism changes the position of going up lower dead center through the length of manual tune connecting rod, and top dead center position is high when connecting rod extends, and combustion chamber volume is little, and compression ratio is high, is fit to diesel combustion; When needs replacing fuel oil was gasoline, the length through man-operated mechanism shortening connecting rod made top dead center position low, and combustion chamber volume is big, and compression ratio is low, is fit to gasoline combustion.
2, variable gear ratio mechanism is set, changes the actuation gear rotating speed of high pressure oil pump, oil pump outlet high pressure when guaranteeing burning diesel oil, oil pump outlet low-pressure during burns gasoline;
The kind of drive of its high pressure oil pump adopts actuation gear 9 transmissions of camshaft 1 front end, and the control mode of two kinds of drive is mainly accomplished with the telescopic location that hydraulic unit driver II 8 drives coupling shaft I 11 and coupling shaft II 12 by hydraulic unit driver I 4.
When fuel oil is diesel oil, need very high pressure, so hydraulic unit driver I 4 is with protruding structure I 13 contractions of coupling shaft I 11 front ends; Like this, just cut off the power transmission of deboost axle 2, at this moment; The protruding structure II 14 of hydraulic unit driver II 8 its coupling shaft II 12 front ends stretches out; Cooperate with the groove I 18 of camshaft 1 front end, like this with power transmission to high pressure oil pump, diesel oil is pressurizeed.
When fuel oil is gasoline, need the pressure of reduction, so hydraulic unit driver II 8 is with protruding structure II 14 contractions of coupling shaft II 12; Cut off the power transmission of camshaft 1 front end; Hydraulic unit driver I 4 stretches out the protruding structure I 13 of coupling shaft I 11, cooperates with the groove I 18 of deboost axle 2, with the power process actuation gear 9 and the reduction gear 3 reduction rotating speeds of camshaft 1; Transfer to sprocket wheel I 5; Sprocket wheel I 5 and sprocket wheel II 6 to high pressure oil pump, pressurize power transmission through chain transmission to gasoline.
In the present invention, mainly by the speed ratio decision of camshaft actuation gear 9 and reduction gear 3, the number of teeth of regulating two gears can be accomplished the selection to gasoline pressure in the reduction of gasoline pressure.
3, increase the high pressure oil drain valve 16 and the low pressure oil drain valve 17 of high pressure oil rail, high pressure oil drain valve 16 and low pressure oil drain valve 17 be all through hydraulic control system 15 its work of control, thus oil rail inner high voltage power when guaranteeing burning diesel oil, the interior low-pressure of oil rail during burns gasoline; This oil rail has two kinds of pressure stability devices, and when fuel was diesel oil, the low-pressure stabilizer lost efficacy; The high pressure stabilizer guarantees to be in the oily rail stable high voltage power diesel oil; When fuel was gasoline, the low-pressure stabilizer worked, and guaranteed to be in the oily rail stabilizing low voltage power gasoline.
Fig. 3 is the structural representation of high pressure oil rail of the present invention.
4, increase motor of the present invention and comprise two fuel tanks, one is diesel oil tank, and one is the machine oil fuel tank, when needing refuelling, the fuel-displaced pipeline of diesel oil tank is extracted, and changes in the petrol tank, promptly realizes changing oil.
Through these corresponding improvement, make that this kind of motor both can burning diesel oil, also can burns gasoline, when at urban traffic situation, change the fuel oil in-line, get oil from petrol tank; Regulate length of connecting rod, reduce compression ratio; Regulate the high pressure oil pump rotating speed, reduce fuel pressure; Launch the low pressure oil drain valve 17 of high pressure oil rail, reduce oily rail pressure; Plug ignition is accomplished the petrol engine circulation, makes the car load speed of a motor vehicle high, adapts to urban traffic situation.
When at complex road conditions such as rural areas, change the fuel oil in-line, get oil from diesel fuel tanks; Regulate length of connecting rod, improve compression ratio; Regulate the high pressure oil pump rotating speed, improve fuel pressure; Close the low pressure oil drain valve 17 of high pressure oil rail, improve oily rail internal pressure, accomplish diesel engine cycle, make that the car load power character is good, adapt to the rural area road conditions.
High pressure oil drain valve 16 is controlled its switching with low pressure oil drain valve 17 through machinery; During burning diesel oil, close the low pressure oil circuit, low pressure relief valve 17 is in normally open under the oil pressure effect; This moment, high pressure oil circuit proper functioning was regulated the pressure of high pressure oil rail 7 through high pressure oil drain valve 16.
During fuel oil gasoline, it is normal that the low pressure oil circuit recovers, and low pressure oil drain valve 17 works, and adjusts oily rail internal pressure, because of the rail internal pressure is lower, is unlikely to open high pressure oil drain valve 16.
The present invention is through transforming fuel injection system, piston connecting bar system to reach the change injection pressure, to change compression ratio, and to adapt to the burning of different oil plants in the motor, this motor is equipped with two fuel tanks, and one is diesel fuel tanks, and one is petrol tank.
Prototype of the present invention is a diesel engine, and to the fuel injection system of diesel engine, piston connecting bar system is transformed, with both reach can combustion diesel fuel the also purpose of burning gasoline.
When fuel was gasoline, its compression ratio required to about 9-12; When fuel was diesel oil, its compression ratio required to about 12-18.Through the regulating piston push and pull system, to reach the function of alterable compression ratio.
When fuel was gasoline, the jet pressure of oil sprayer was about 90-110bar; When fuel was diesel oil, the jet pressure of oil sprayer can arrive 1200-2000bar.Through regulating high pressure oil pump, oily rail pressure maintaining valve, to reach the variable function of jet pressure.Jet pressure is realized through adjustment high pressure relief valve and low pressure relief valve.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technological scheme to carry out; Or design of the present invention and technological scheme are directly applied to other occasions without improving, all in protection scope of the present invention.

Claims (8)

1. a duel fuel engine comprises camshaft (1), high pressure oil rail (7); Piston crank mechanism (10) is characterized in that: described duel fuel engine also comprises reduction gear (3), sprocket wheel I (5); Sprocket wheel II (6); Actuation gear (9), described actuation gear (9) is connected with camshaft (1), and actuation gear (9) and sprocket wheel II (6) are set to the connection breaking off, be connected; The engagement of described reduction gear (3) and actuation gear (9), described reduction gear (3) and sprocket wheel I (5) are set to the connection breaking off, be connected.
2. duel fuel engine according to claim 1; It is characterized in that: on the junction surface of described actuation gear (9) and sprocket wheel II (6) the concavo-convex structure that cooperates is set; On the junction surface of described reduction gear (3) and sprocket wheel I (5) the concavo-convex structure that cooperates is set; Described sprocket wheel I (5) is connected with reduction gear (3) through coupling shaft I (11); Described sprocket wheel II (6) is connected with actuation gear (9) through coupling shaft II (12), and hydraulic unit driver I (4) and hydraulic unit driver II (8) that the control connection shaft extension contracts are set respectively on described coupling shaft I (11) and the coupling shaft II (12).
3. duel fuel engine according to claim 1 and 2; It is characterized in that: described reduction gear (3) is fixedly connected with deboost axle (2); The groove I (18) of yi word pattern is set on the deboost axle (2), and described coupling shaft I (11) goes up the yi word pattern protruding structure I (13) that is provided with the nested installation of groove I (18); The groove II (19) of yi word pattern is set on the described actuation gear (9), and described coupling shaft II (12) goes up the yi word pattern protruding structure II (14) that is provided with the nested installation of groove II (19).
4. duel fuel engine according to claim 3 is characterized in that: described hydraulic unit driver I (4) all is connected with its flexible hydraulic control system (15) of control with hydraulic unit driver II (8).
5. duel fuel engine according to claim 4 is characterized in that: on the high pressure oil oil rail (7) of described duel fuel engine two Decompression valvess are set, are respectively high pressure relief valve (16) and low pressure relief valve (17).
6. duel fuel engine according to claim 1 is characterized in that: the piston crank mechanism of described duel fuel engine (10) is set to the structure that compression ratio can change.
7. duel fuel engine according to claim 5 is characterized in that: described high pressure relief valve (16) is that oil pressure is arranged on the structure between the 1200-2000bar, and described low pressure relief valve (17) is that oil pressure is arranged on the structure between the 90-110bar.
8. duel fuel engine according to claim 6 is characterized in that: described piston crank mechanism (10) is set to compression ratio variable structure between 9-18.
CN201010246452XA 2010-07-30 2010-07-30 Dual-fuel engine Active CN101900029B (en)

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CN101900029B true CN101900029B (en) 2012-02-15

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190418487A (en) * 1903-09-01 1904-10-06 Hugo Junkers An Improved Method of and Apparatus for Determining the Heating Value of Gaseous and Liquid Fuels.
GB248909A (en) * 1925-02-24 1926-03-18 Harry Ralph Ricardo Improvements in or relating to internal combustion or other fluid-pressure engines
US5361035A (en) * 1992-02-11 1994-11-01 Ford Motor Company Resonant cavity flexible fuel sensor and system
RU2114315C1 (en) * 1997-12-02 1998-06-27 Виталий Алексеевич Конюхов Adaptive multifuel internal combustion engine
CN101144424A (en) * 2007-08-29 2008-03-19 叶冠升 Arrangement of double-fuel diesel engine for vehicle
CN101428552A (en) * 2008-12-10 2009-05-13 姚国瑞 Vehicle mounted hydrogen gas and fuel oil hybrid power system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190418487A (en) * 1903-09-01 1904-10-06 Hugo Junkers An Improved Method of and Apparatus for Determining the Heating Value of Gaseous and Liquid Fuels.
GB248909A (en) * 1925-02-24 1926-03-18 Harry Ralph Ricardo Improvements in or relating to internal combustion or other fluid-pressure engines
US5361035A (en) * 1992-02-11 1994-11-01 Ford Motor Company Resonant cavity flexible fuel sensor and system
RU2114315C1 (en) * 1997-12-02 1998-06-27 Виталий Алексеевич Конюхов Adaptive multifuel internal combustion engine
CN101144424A (en) * 2007-08-29 2008-03-19 叶冠升 Arrangement of double-fuel diesel engine for vehicle
CN101428552A (en) * 2008-12-10 2009-05-13 姚国瑞 Vehicle mounted hydrogen gas and fuel oil hybrid power system

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