阅读说明：本技术 一种高熔点脂肪酸甲酯或乙酯供油系统 (A kind of high-melting fat fatty acid methyl esters or ethyl ester oil supply system ) 是由 潘锁柱 蔡凯 刘兴文 蔡敏 韩伟强 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种高熔点脂肪酸甲酯或乙酯供油系统,包括双作用液压缸、高压柴油供油单元、低压脂肪酸甲酯或乙酯供给单元以及脂肪酸甲酯或乙酯缸内直喷单元；双作用液压缸包括液压缸缸体、端盖、T型活塞、分隔块和活塞；高压柴油供给单元包括柴油箱、第一燃油滤清器、高压柴油泵、第一稳压腔、调压阀、两位四通电磁阀、第一输油泵和第二输油泵；低压脂肪酸甲酯或乙酯供给单元包括脂肪酸甲酯或乙酯箱；脂肪酸甲酯或乙酯箱装有第二热电偶加热棒、过滤层、第一热电偶加热棒；脂肪酸甲酯或乙酯缸内直喷单元包括第二稳压腔和缸内直喷喷油器。本发明通过高压柴油供给单元间接地控制脂肪酸甲酯或乙酯的供油压力,实现脂肪酸甲酯或乙酯持续循环供给。(The invention discloses a kind of high-melting fat fatty acid methyl esters or ethyl ester oil supply systems, including double acting hydraulic cylinder, high-pressure diesel oil supply unit, low pressure fatty acid methyl ester or ethyl ester feed unit and fatty acid methyl ester or ethyl ester in-cylinder direct-jet unit；Double acting hydraulic cylinder includes hydraulic cylinder body, end cap, T-type piston, spacing block and piston；High-pressure diesel feed unit includes diesel fuel tanks, the first fuel filter, fuel pump, the first pressure stabilizing cavity, pressure regulator valve, two position four-way solenoid valves, the first oil transfer pump and the second oil transfer pump；Low pressure fatty acid methyl ester or ethyl ester feed unit include fatty acid methyl ester or ethyl ester case；Fatty acid methyl ester or ethyl ester case are equipped with the second thermocouple heating rod, filter layer, the first thermocouple heating rod；Fatty acid methyl ester or ethyl ester in-cylinder direct-jet unit include the second pressure stabilizing cavity and in-cylinder direct-jet fuel injector.The present invention is indirectly controlled the charge oil pressure of fatty acid methyl ester or ethyl ester by high-pressure diesel feed unit, realizes fatty acid methyl ester or ethyl ester persistent loop supply.)

1. a kind of high-melting fat fatty acid methyl esters or ethyl ester oil supply system, which is characterized in that including double acting hydraulic cylinder, high-pressure diesel Feed unit, low pressure fatty acid methyl ester or ethyl ester feed unit and fatty acid methyl ester or ethyl ester in-cylinder direct-jet unit；

The double acting hydraulic cylinder (16) include hydraulic cylinder body (17), end cap (18), T-type piston (20), spacing block (21) and Piston (23)；End cap (18) is fixed on hydraulic cylinder body (17) by bolt of cover (29)；T-type piston (20) passes through spacing block (21) circular hole constitutes an entirety by piston pin (22) and piston (23), and spacing block (21) is fixed by spacing block bolt (28) On hydraulic cylinder body (17)；The T-type piston (20), spacing block (21) and piston (23) divide double acting hydraulic cylinder (16) For 4 air-tight chambers, respectively first chamber (24), second chamber (25), third chamber (26) and the 4th chamber (27), and Two chambers (25) are connected with A pipeline (13), and third chamber (26) is connected with B pipeline (12)；Hydraulic cylinder body is set on (17) It is equipped with first exhaust device (30) and second exhaust device (31)；

The high-pressure diesel feed unit includes diesel fuel tanks (1), the first fuel filter (2), fuel pump (3), first steady Press chamber (4), pressure regulator valve (5), two position four-way solenoid valves (9), the first oil transfer pump (14) and the second oil transfer pump (15)；Two four energizations Magnet valve (9) by solenoid valve controller (10) control, and two position four-way solenoid valve (9) be separately connected the first diesel oil pipeline (7), Second diesel oil pipeline (8), A pipeline (13), B pipeline (12)；The first fuel filter is provided on the first diesel oil pipeline (7) (2), fuel pump (3) and the first pressure stabilizing cavity (4)；It is provided on the first pressure stabilizing cavity (4) pressure regulator valve (5), pressure regulator valve (5) is logical Oil return line (6) is crossed to be connected with diesel fuel tanks (1)；First diesel oil pipeline (7), the second diesel oil pipeline (8) respectively with diesel fuel tanks (1) It is connected；The first oil transfer pump (14) and the second oil transfer pump (15) are respectively arranged on A pipeline (13) and B pipeline (12)；

The low pressure fatty acid methyl ester or ethyl ester feed unit include fatty acid methyl ester or ethyl ester case (36)；Fatty acid methyl ester or second Ester case (36) upper layer is equipped with the second thermocouple heating rod (39), and centre is provided with filter layer (38), and lower layer is equipped with the first thermocouple Heating rod (37)；The fatty acid methyl ester or the outlet of ethyl ester case (36) one end pass through the first pipeline (32) and first chamber (24) phase Connection, is provided with the first check valve (33), the second fuel filter (34) and third oil transfer pump (35) on the first pipeline (32), Other end outlet is connected by the second pipeline (43) with the 4th chamber (27), and it is unidirectional that second is provided on the second pipeline (43) Valve (44), third fuel filter (45) and the 4th oil transfer pump (46)；

The fatty acid methyl ester or ethyl ester in-cylinder direct-jet unit include the second pressure stabilizing cavity (50) and in-cylinder direct-jet fuel injector (53)；The Two pressure stabilizing cavities (50) by third pipeline (41) and the 4th pipeline (47) respectively with first chamber (24) and the 4th chamber (27) phase Connection；It is provided on third pipeline (41) third check valve (42), is provided with the 4th check valve (48) on the 4th pipeline (47)； Second pressure stabilizing cavity (50) is connected by high-pressure oil pipe (52) with in-cylinder direct-jet fuel injector (53)；Pacify on the second pressure stabilizing cavity (50) Equipped with pressure sensor (49), pressure sensor (49) is connected by signal transmssion line (11) with solenoid valve controller (10), is given Solenoid valve controller (10) feedback signal；Third exhaust apparatus (51) are additionally provided on the second pressure stabilizing cavity (50).

2. a kind of high-melting fat fatty acid methyl esters as described in claim 1 or ethyl ester oil supply system, which is characterized in that the double cropping With hydraulic cylinder (16) just like the requirement of flowering structure size: when T-type piston (20) is located at hydraulic cylinder body (17) interior any position, T The distance a of type piston (20) left side to step surface on the left of hydraulic cylinder body (17) should be with piston (23) left side to B pipeline (12) the distance c of right side is equal, i.e. a=c；The distance b of T-type piston (20) right side to A pipeline (13) left side should be with piston (23) the distance d of right side to step surface on the left of end cap (18) is equal, i.e. b=d.

3. a kind of high-melting fat fatty acid methyl esters as described in claim 1 or ethyl ester oil supply system, which is characterized in that in the liquid Cylinder pressure cylinder body (17) and the contact site of end cap (18) are provided with one layer of gasket (19).

Technical field

The invention belongs to field of internal combustion engine, and in particular to a kind of fusing point height, poor fluidity, poor lubricity for internal combustion engine Fatty acid methyl ester or ethyl ester oil supply system.

Background technique

With increasingly sharpening for environmental pollution and energy shortage, the renewable of achievable internal combustion engine high-efficiency cleaning burning is utilized The energy has become important one of project.Clean biometric fuel of the biodiesel as alternative petrifaction diesel has good Environmental characteristics and biodegradable have vast potential for future development, highly beneficial to the burning of internal combustion engine.

Biodiesel is chemically from the point of view of ingredient, mainly the fatty acid methyl ester of C12-C22 or second rouge, can pass through vegetable and animals oils Rouge is generated with short chain alcohol (methanol, ethyl alcohol etc.) through esterification.These fatty acid methyl esters or ethyl ester have fusing point height, mobility The properties such as difference, poor lubricity, it is difficult to carry out injection in cylinder of internal-combustion engine using existing commercial oil supply system and form flammable mixing Gas hinders the smooth development of the research work such as the influence of fatty acid methyl ester or ethyl ester to engine performance.Therefore, in order to comprehensive Comprehensive research fatty acid methyl ester or ethyl ester design under a kind of normal temperature and pressure the affecting laws of combustion in IC engine, emission performance The high-melting fat fatty acid methyl esters or ethyl ester oil supply system for capableing of reliably working are very necessary.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of high-melting fat fatty acid methyl esters or ethyl ester oil supply systems, can Realizing, there is dystectic fatty acid methyl ester or ethyl ester reliably to spray in cylinder of internal-combustion engine.

In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of high-melting fat fatty acid methyl esters or ethyl ester Oil supply system includes double acting hydraulic cylinder, high-pressure diesel feed unit, low pressure fatty acid methyl ester or ethyl ester feed unit and rouge Fatty acid methyl esters or ethyl ester in-cylinder direct-jet unit；

The double acting hydraulic cylinder includes hydraulic cylinder body, end cap, T-type piston, spacing block and piston；End cap passes through bolt of cover It is fixed on hydraulic cylinder body；T-type piston passes through spacing block circular hole and constitutes an entirety by piston pin and piston, and spacing block is logical Spacing block bolt is crossed to be fixed on hydraulic cylinder body；Double acting hydraulic cylinder is divided into 4 by the T-type piston, spacing block and piston A air-tight chamber, respectively first chamber, second chamber, third chamber and the 4th chamber, and second chamber is connected with A pipeline Logical, third chamber is connected with B pipeline；First exhaust device and second exhaust device are provided on hydraulic cylinder body.

The high-pressure diesel feed unit include diesel fuel tanks, the first fuel filter, fuel pump, the first pressure stabilizing cavity, Pressure regulator valve, two position four-way solenoid valves, the first oil transfer pump and the second oil transfer pump；Two position four-way solenoid valves are by solenoid valve controller control System, and two position four-way solenoid valve is separately connected the first diesel oil pipeline, the second diesel oil pipeline, A pipeline, B pipeline；In the first bavin The first fuel filter, fuel pump and the first pressure stabilizing cavity are provided on oil pipe line；Pressure regulation is provided on the first pressure stabilizing cavity Valve, pressure regulator valve are connected by oil return line with diesel fuel tanks；First diesel oil pipeline, the second diesel oil pipeline are connected with diesel fuel tanks respectively It is logical；The first oil transfer pump and the second oil transfer pump are respectively arranged on A pipeline and B pipeline.

The low pressure fatty acid methyl ester or ethyl ester feed unit include fatty acid methyl ester or ethyl ester case；Fatty acid methyl ester or second Ester case upper layer is equipped with the second thermocouple heating rod, and centre is provided with filter layer, and lower layer is equipped with the first thermocouple heating rod；The rouge Fatty acid methyl esters or the outlet of ethyl ester case one end are connected by the first pipeline with first chamber, and it is single that first is provided on the first pipeline To valve, the second fuel filter and third oil transfer pump, other end outlet is connected by the second pipeline with the 4th chamber, second Second one-way valve, third fuel filter and the 4th oil transfer pump are provided on pipeline.

The fatty acid methyl ester or ethyl ester in-cylinder direct-jet unit include the second pressure stabilizing cavity and in-cylinder direct-jet fuel injector；Second is steady Pressure chamber is connected with first chamber and the 4th chamber respectively by third pipeline and the 4th pipeline；Is provided on third pipeline Three check valves are provided with the 4th check valve on the 4th pipeline；Second pressure stabilizing cavity passes through high-pressure oil pipe and in-cylinder direct-jet fuel injector phase Connection；Pressure sensor is installed on the second pressure stabilizing cavity, pressure sensor passes through signal transmssion line and solenoid valve controller phase Even, solenoid valve controller feedback signal is given；Third exhaust apparatus is additionally provided on the second pressure stabilizing cavity.

Further, the double acting hydraulic cylinder is just like the requirement of flowering structure size: such as attached drawing 2, when T-type piston be located at it is hydraulic In cylinder cylinder body when any position, the distance a of step surface should be arrived with piston left side on the left of T-type piston left side to hydraulic cylinder body The distance c of B pipeline right side is equal, i.e. a=c；The distance b of T-type piston right side to A pipeline left side should be with piston right side The distance d of step surface is equal on the left of to end cap, i.e. b=d.

Further, the contact site of the hydraulic cylinder body and end cap is provided with one layer of gasket.

Compared with prior art, the beneficial effects of the present invention are: being able to achieve higher melting-point fatty acid methyl ester or ethyl ester liquid Change supply, evaporation atomization is mixed with air in reliable penetrating cylinder of internal-combustion engine, and can pass through high-pressure diesel feed unit It is indirectly controlled the charge oil pressure of fatty acid methyl ester or ethyl ester；System operatio is simple, it can be achieved that fatty acid methyl ester or ethyl ester are held Continuous circulation supply.

Detailed description of the invention

Fig. 1 is a kind of high-melting fat fatty acid methyl esters of the present invention or ethyl ester oil supply system structural schematic diagram.

Fig. 2 is double acting hydraulic cylinder structural schematic diagram in the present invention.

In figure: 1- diesel fuel tanks；The first fuel filter of 2-；3- fuel pump；The first pressure stabilizing cavity of 4-；5- pressure regulator valve；6- Oil return line；7- the first diesel oil pipeline；8- the second diesel oil pipeline；Two position four-way solenoid valve of 9-；10- solenoid valve controller；11- letter Number transmission line；12-B pipeline；13-A pipeline；The first oil transfer pump of 14-；The second oil transfer pump of 15-；16- double acting hydraulic cylinder；17- liquid Cylinder pressure cylinder body；18- end cap；19- gasket；20-T type piston；21- spacing block；22- piston pin；23- piston；24- first chamber； 25- second chamber；26- third chamber；The 4th chamber of 27-；28- spacing block bolt；29- bolt of cover；30- first exhaust dress It sets；31- second exhaust device；The first pipeline of 32-；The first check valve of 33-；The second fuel filter of 34-；35- third oil transfer pump； 36- fatty acid methyl ester or ethyl ester case；37- the first thermocouple heating rod；38- filter layer；39- the second thermocouple heating rod；40- rouge Mouth is added in fatty acid methyl esters or ethyl ester；41- third pipeline；42- third check valve；The second pipeline of 43-；44- second one-way valve；45- Third fuel filter；The 4th oil transfer pump of 46-；The 4th pipeline of 47-；The 4th check valve of 48-；49- pressure sensor；50- second Pressure stabilizing cavity；51- third exhaust apparatus；52- high-pressure oil pipe；53- in-cylinder direct-jet fuel injector.

Specific embodiment

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As depicted in figs. 1 and 2, in the present invention, T-type piston 20 is first passed through into the circular hole among spacing block 21, T-type piston rod It is clearance fit between circular hole, T-type piston rod can be controlled in circular hole and be moved freely；Then, by T-type piston rod piston pin 22 are mounted in the pin hole of piston 23, and four parts constitute an assembly.The assembly that four parts are constituted is put into from right side In hydraulic cylinder body 17, first exhaust device 30 and second exhaust device 31 are provided on hydraulic cylinder body 17 to be arranged Gas.Double using spacing block bolt 28(, every row 8 is circumferential uniformly distributed along hydraulic cylinder body 17) spacing block 21 is fixed on it is hydraulic It on cylinder cylinder body 17, and is clearance fit between spacing block 21 and hydraulic cylinder body 17.Using bolt of cover 29(8, circumferentially Cloth) hydraulic cylinder body 17 and end cap 18 are fastened, gasket 19 is provided between hydraulic cylinder body 17 and end cap 18 to prevent from leaking. It is clearance fit between T-type piston 20, piston 23 and hydraulic cylinder body 17, can be freely moved left and right in hydraulic cylinder body 17 It is dynamic.So far, double acting hydraulic cylinder 16 is divided into first chamber 24, second chamber 25, third chamber 26 and the 4th chamber 27 4 Chamber.Second chamber 25 is connected with A pipeline 13, and third chamber 26 is connected with B pipeline 12.Divide on A pipeline 13 and B pipeline 12 It is not provided with the first oil transfer pump 14 and the second oil transfer pump 15.

Two position four-way solenoid valves 9 are arranged between diesel fuel tanks 1 and double acting hydraulic cylinder 16, and upside connects A pipeline 13 and B pipe Road 12, downside connect the first diesel oil pipeline 7 and the second diesel oil pipeline 8；First diesel oil pipeline 7 and the second diesel oil pipeline 8 are and bavin Fuel tank 1 is connected, and the first fuel filter 2, fuel pump 3 and the first pressure stabilizing cavity 4 are provided on the first diesel oil pipeline 7；The Pressure regulator valve 5 is provided on one pressure stabilizing cavity 4, pressure regulator valve 5 is connected by oil return line 6 with diesel fuel tanks 1.Two position four-way solenoid valves 9 Also it is connected with solenoid valve controller 10, solenoid valve controller 10 is connected by signal transmssion line 11 with pressure sensor 49, It commutates to control two position four-way solenoid valves 9 by pressure feedback.

The first chamber 24 of double acting hydraulic cylinder 16, the 4th chamber 27 respectively by the first pipeline 32, the second pipeline 43 with Fatty acid methyl ester or ethyl ester case 36 are connected, and the first check valve 33, the second fuel filter 34 are provided on the first pipeline 32 With third oil transfer pump 35, second one-way valve 44, third fuel filter 45 and the 4th oil transfer pump are provided on the second pipeline 43 46；

Fatty acid methyl ester or 36 upper end of ethyl ester case, which are provided with, is added mouth 40, thus fatty acid methyl ester or ethyl ester are added；Fatty acid methyl Be additionally provided with filter layer 38 inside ester or ethyl ester case 36, the second thermocouple heating rod 39 be provided with above filter layer 38, be used to pair Fusing point height, the fatty acid methyl ester of poor fluidity or ethyl ester above filter layer 38 are heated, when fatty acid methyl ester or ethyl ester are molten It turns to and 36 bottom of fatty acid methyl ester or ethyl ester case is flowed to by filter layer 38 after liquid.In 36 bottom of fatty acid methyl ester or ethyl ester case Be provided with the first thermocouple heating rod 37, for bottom fatty acid methyl ester or ethyl ester heating keep its be liquid.

The first chamber 24 of double acting hydraulic cylinder 16, the 4th chamber 27 also pass through third pipeline 41, the 4th pipeline 47 and the Two pressure stabilizing cavities 50 are connected；Second pressure stabilizing cavity 50 is connected by high-pressure oil pipe 52 with in-cylinder direct-jet fuel injector 53；Third pipeline 41 and the 4th are respectively arranged with third check valve 42 and the 4th check valve 48 on pipeline 47；Third is provided on second pressure stabilizing cavity 50 Exhaust apparatus 51 and pressure sensor 49, pressure sensor 49 are connected by signal transmssion line 11 with solenoid valve controller 10.

Before apparatus of the present invention work, fatty acid methyl ester or ethyl ester case is added by addition mouth 40 first in fatty acid methyl ester or ethyl ester 36；Then, the second thermocouple heating rod 39 starts to heat fatty acid methyl ester or ethyl ester, when fatty acid methyl ester or ethyl ester are heated When turning to flowable liquid, the bottom of fatty acid methyl ester or ethyl ester case 36, the heating of the first thermocouple are flowed by filter layer 38 Stick 37 starts to carry out heating and thermal insulation to fatty acid methyl ester or ethyl ester, its moment is made to remain liquid.

Next, emptying to the air in device, operating process is as follows:

1, third exhaust apparatus 51 is opened, third oil transfer pump 35 and the 4th oil transfer pump 46 is manually operated to the fatty acid methyl ester of liquid Or ethyl ester pressurizes.The fatty acid methyl ester or second rouge in left side will be passed through by the first pipeline 32 in fatty acid methyl ester or ethyl ester case 36 Third oil transfer pump 35, the second fuel filter 34 and the first check valve 33 sequentially enter first chamber 24 and third pipeline 41, then Enter the second pressure stabilizing cavity 50 through third check valve 42 by third pipeline 41；The fatty acid on right side in fatty acid methyl ester or ethyl ester case 36 Methyl esters or second rouge will by the second pipeline 43 by the 4th oil transfer pump 46, third fuel filter 45 and second one-way valve 44 successively into Enter the 4th chamber 27 and the 4th pipeline 47, then enters the second pressure stabilizing cavity 50 through the 4th check valve 48 by the 4th pipeline 47.Work as third When exhaust apparatus 51 starts draining, third oil transfer pump 35 and the 4th oil transfer pump 46 are stopped operation, and close third exhaust apparatus 51. To realize the first pipeline 32, the second pipeline 43, first chamber 24, the 4th chamber 27, third pipeline 41, the 4th pipeline 47 and the The emptying of air and the filling of fatty acid methyl ester or ethyl ester in two pressure stabilizing cavities 50.

2, two position four-way solenoid valves 9 are made to be repositioned to initial position (initial position are as follows: A pipeline using solenoid valve controller 10 13 communicate with the first diesel oil pipeline 7, and B pipeline 12 is communicated with the second diesel oil pipeline 8).Open first exhaust device 30 and second row Device of air 31, is manually operated the first oil transfer pump 14 and the second oil transfer pump 15 pressurizes to diesel oil.On the one hand, diesel oil will be by first Diesel oil pipeline 7 is through the first fuel filter 2, fuel pump 3, the first pressure stabilizing cavity 4, two position four-way solenoid valves 9,13 and of A pipeline First oil transfer pump 14 enters second chamber 25；On the other hand, diesel oil will be by the second diesel oil pipeline 8 through two position four-way solenoid valves 9, B Pipeline 12 and the second oil transfer pump 15 enter third chamber 26.When first exhaust device 30 and second exhaust device 31 start draining When, the first oil transfer pump 14 and the second oil transfer pump 15 are stopped operation, and close first exhaust device 30 and second exhaust device 31.From And realize the first diesel oil pipeline 7, the second diesel oil pipeline 8, the first pressure stabilizing cavity 4, A pipeline 13, B pipeline 12, second chamber 25 and the The emptying of air and the filling of diesel oil in three chambers 26.

When apparatus of the present invention work, work is circuited sequentially as follows:

3, two position four-way solenoid valves 9 are controlled using solenoid valve controller 10 and is repositioned to initial position (that is: A pipeline 13 and the first bavin Oil pipe line 7 communicates, and B pipeline 12 is communicated with the second diesel oil pipeline 8), start fuel pump 3.Work of the diesel oil in fuel pump 3 It is flowed out under from diesel fuel tanks 1, the first fuel filter 2, fuel pump 3, the first pressure stabilizing cavity is passed through in the first diesel oil pipeline 7 4, two position four-way solenoid valves 9 are entered the second chamber 25 of double acting hydraulic cylinder 16 by A pipeline 13.It is installed on the first pressure stabilizing cavity 4 Pressure regulator valve 5 have the function of adjust diesel pressure.When diesel pressure is less than or equal to the goal pressure P MPa of setting, pressure regulation Valve 5 is closed；And when diesel pressure is greater than the goal pressure P MPa of setting, pressure regulator valve 5 is opened, and diesel oil will pass through oil return line 6 It is back to diesel fuel tanks 1；To the goal pressure P MPa that the diesel pressure remained in the first pressure stabilizing cavity 4 is setting.T-type is living Plug 20 moved downward under the action of 25 mesohigh diesel oil of second chamber in first chamber 24 fatty acid methyl ester or ethyl ester into Row pressurization.Fatty acid methyl ester or ethyl ester after pressurization enter the second pressure stabilizing cavity 50 through third check valve 42 in third pipeline 41, Pressure stabilizing (goal pressure P MPa) is sprayed into cylinder by in-cylinder direct-jet fuel injector 53 afterwards in the second pressure stabilizing cavity 50.Together When, T-type piston 20 is moved to the left with piston 23 increases the volume of the 4th chamber 27, generates negative pressure, the fatty acid of liquid Methyl esters or ethyl ester will be inhaled into the 4th chamber 27 from fatty acid methyl ester or ethyl ester case 36 by the second pipeline 43, keep the 4th chamber Always fatty acid methyl ester or ethyl ester are filled up in room 27.In addition, T-type piston 20 is moved to the left with piston 23 will also make third chamber 26 volume reduces, and the diesel oil in third chamber 26 will be returned by B pipeline 12, two position four-way solenoid valves 9 and the second diesel oil pipeline 8 It flow to diesel fuel tanks 1.When T-type piston 20, which is moved to the left, to be bonded with 17 left side step surface of hydraulic cylinder body, T-type piston 20 cannot Continue in first chamber 24 fatty acid methyl ester or ethyl ester pressurize, and in-cylinder direct-jet fuel injector 53 is still to engine air Fatty acid methyl ester or ethyl ester are sprayed into cylinder, the pressure in the second pressure stabilizing cavity 50 will be begun to decline.When solenoid valve controller 10 passes through When the feedback pressure that signal transmssion line 11 receives pressure sensor 49 is less than or equal to (P-3) MPa, two four-way electromagnetics will be controlled Valve 9 commutates, and is connected to A pipeline 13 with the second diesel oil pipeline 8, B pipeline 12 is connected to the first diesel oil pipeline 7.

4, at this point, diesel oil flows out under the action of fuel pump 3 from diesel fuel tanks 1, by the in the first diesel oil pipeline 7 One fuel filter 2, fuel pump 3, the first pressure stabilizing cavity 4, two position four-way solenoid valves 9 enter double-action hydraulic by B pipeline 12 The third chamber 26 of cylinder 16.And the pressure regulator valve 5 being installed on the first pressure stabilizing cavity 4 remains the diesel oil in the first pressure stabilizing cavity 4 Pressure is the goal pressure P MPa of setting.Piston 23 moves right under the action of 26 mesohigh diesel oil of third chamber to the 4th Fatty acid methyl ester or ethyl ester pressurization in chamber 27.Fatty acid methyl ester or ethyl ester after pressurization is single through the 4th in the 4th pipeline 47 Enter in the second pressure stabilizing cavity 50 to valve 48, pressure stabilizing (goal pressure P MPa) is sprayed by in-cylinder direct-jet afterwards in the second pressure stabilizing cavity 50 Oily device 53 sprays into cylinder.Meanwhile piston 23 drives T-type piston 20 to move right and increase the volume of first chamber 24 Add, generate negative pressure, the fatty acid methyl ester or ethyl ester of liquid will be inhaled from fatty acid methyl ester or ethyl ester case 36 by the first pipeline 32 Enter in first chamber 24, keeps filling up fatty acid methyl ester or ethyl ester always in first chamber 24.In addition, piston 23 drives T-type living Plug 20 moves right and also reduces the volume of second chamber 25, and the diesel oil in second chamber 25 will pass through B pipeline 12, two four Three-way electromagnetic valve 9 and the second diesel oil pipeline 8 are back to diesel fuel tanks 1.It is living when piston 23, which moves right, to be bonded with 18 step surface of end cap Plug 23 by cannot continue in the 4th chamber 27 fatty acid methyl ester or ethyl ester pressurize, and in-cylinder direct-jet fuel injector 53 is still Fatty acid methyl ester or ethyl ester are sprayed into cylinder, the pressure in the second pressure stabilizing cavity 50 will be begun to decline.When solenoid valve control When device 10 processed is less than or equal to (P-3) MPa by the feedback pressure that signal transmssion line 11 receives pressure sensor 49, two will be controlled Position four-way solenoid valve 9 commutates, it is made to be repositioned to initial position, i.e. A pipeline 13 is communicated with the first diesel oil pipeline 7, B pipeline 12 and the Two diesel oil pipelines 8 communicate.

5, the course of work of step 3 is repeated.