Abstract:
An energy-storing-type high-pressure electric fuel pump includes an electromagnetic driving apparatus and a plunger sleeve cylinder component. The plunger sleeve cylinder component includes a high-pressure volume, a plunger sleeve having a plunger hole, and a plunger capable of sliding within the plunger hole. A clearance volume of the plunger in the plunger hole is a high-pressure fuel chamber. A clearance volume between the electromagnetic driving apparatus and the plunger sleeve cylinder component forms a low-pressure fuel chamber. Under the action of the electromagnetic driving apparatus, the plunger sleeve cylinder component sucks a fuel in the low-pressure fuel chamber into the high-pressure fuel chamber and pressure-feeds the fuel into the high-pressure volume. The electromagnetic driving apparatus includes an energy storage apparatus, a movable part, and a still part.

Description:
TECHNOLOGY FIELD 
       [0001]    This invention belongs to the field of engines technology, especially relating to the direct-injection spark-ignition system. 
       BACKGROUND 
       [0002]    Direct injection technology is a way of directly injecting fuels into an engine with spark-ignition cylinders. Direct-injection engines have great fuel economy. They represent important development for future engines. The most important part for direct injection is the fuel-supplying system. A good fuel-supply system should satisfy as much as possible the combustion, performance and discharge requirements of the engines. The goal is to have direct injection engines that are affordable and easy to use. 
         [0003]    Gasoline Direct Injection (GDI) is used in an increasing number of car engines. Most of the direct-injection systems used in car engines are common-rail fuel line injection systems. Except during the start-up process, the pressure in the common-rail fuel lines typically remains between 8 and 20 MPa. Currently, the method to build such pressure in the common-rail fuel lines relies on mechanical plunger pumps with electromagnetic controls. These pumps are driven by cams. When installing such pumps, the starter has to be redesigned. In addition, mechanical GDI high pressure pumps have several disadvantages as follows: 
         [0004]    1) Unstable pressure in the fuel rail before engine starts. When not used for a long time, the pressure will decrease to under 1 MPa, causing problems in engine start and the subsequent transition process, and also causing the engine to emit pollutants. 
         [0005]    2) Unstable pressure in the fuel rail, and the pressure varies significantly with different phases of cams. 
         [0006]    3) Complicated working conditions in transitioning from complete stoppage of fuel supply to resupplying fuels. It is hard to maintain the same rail pressure while the fuel stops or during engine idle. 
         [0007]    4) When under partial loads, fuel is repeatedly heated. The low pressure metal matric diaphragm (MMD) is adversely impacted by dual effects of temperature and alternating pressure. 
         [0008]    5) There is a strong link between the computational logic for the amount of fuel needed by engines and the regulation of the high-pressure pump. This results in complicated control logic. 
         [0009]    6) If the fuel rail has a limited capacity, the pressure fluctuation would be increased. 
         [0010]    If the fuel rail capacity is too large, a long process would be needed to establish the pressure before starting. 
         [0011]    In sum, the above-described problems and dilemma exist in current GDI mechanic pumps. To completely overcome these problems, new approaches to alternative pump technology is needed. In comparison, electronic fuel pumps do not have the problems mentioned above. The advantages of electronic fuel pumps include: they can establish high pressure before engines start; they can increase fuel rail capacity without limitations or introduce buffers, therefor achieving constant pressure injection by minimizing fuel rail pressure fluctuations; they can more precisely supply fuel as needed; when fuel is not needed, it can completely stop working; the fuel pumps have little impact on fuel lines; and the fuel pumps are independent of the engines, making it easier to install, produce and service. 
         [0012]    However, it is difficult for current electronic fuel pumps to establish fuel pressure that is over 8 MPa. The pressure established in rotary electronic fuel pumps is no more than 3 MPa. Theoretically, the pressure achievable by a plunger pump driven by a rotary motor is no different from that achievable by a mechanic pump. However, the efficiency is much lower for a rotary motor driven one, and it costs more than a mechanic pump. Current methods using linear motor to directly drive a plunger pump, instead of cams, result in low energy conversion efficiency and low time utilization efficiency. To achieve high pressure using these methods, the products would become bulky and costly. 
       SUMMARY OF THE INVENTION 
       [0013]    In view of the various issues in the prior art, an object of the invention is to use an electrical reciprocating direct drive apparatus and the energy-storing principle to release all phases of energy at certain phases, thereby improving the transient energy density in power drive device and also increasing the fuel pressures in the pumps. 
         [0014]    Objects of the invention may be achieved by the following embodiments: 
         [0015]    An energy-storing, high-pressure electric fuel pump, comprising an electromagnetic power device and a plunger sleeve assembly. The plunger sleeve assembly comprises a high pressure volume (or high-pressure cavity), a plunger sleeve containing a plunger chamber (plunger hole), and a plunger that can slide in the plunger chamber. A low-pressure fuel chamber is formed by the remaining volume between the electromagnetic power device and the plunger sleeve assembly. A high-pressure fuel chamber is defined in the plunger chamber by the plunger. Under the action of the electromagnetic drive device, the plunger sleeve assembly could transport the fuel from the low-pressure fuel chamber to the high-pressure fuel chamber and subsequently compress the fuel and force it into the high-pressure volume. The electromagnetic power device comprises an energy-storage device, a moving component, and a stationary component. The electromagnetic power device is controlled by a driving current to convert the electric energy into a bi-directional alternating driving force to drive the moving component in a reciprocating movement. In the first direction of the reciprocating motion, the energy-storage device absorbs the energy from the moving component. In the second direction of the reciprocating motion, the plunger sleeve assembly transports the fuel under the coordinated actions of the moving component and the energy-storage device. 
         [0016]    The energy-storage device comprises at least one energy-storing spring disposed between the moving component and the stationary component. Alternatively, it can use a hydraulic fluid chamber with a certain capacity for energy-storage, which includes a plunger for the hydraulic fluid chamber, a one-way open check valve from the hydraulic fluid supply source to the hydraulic fluid chamber. Once the pressure in the hydraulic fluid chamber is higher than a threshold, the one-way check valve shuts off and the energy-storage begins. 
         [0017]    The electromagnetic power device includes a voice coil motor. The moving component comprises a basket and a coil that is connected to the basket, wherein the basket is used to relay the force generated by the coil. 
         [0018]    The voice coil motor comprises a U-shaped soft magnet and a magnet stack. The magnet stack is roughly cylindrical and includes a first permanent magnet and a first soft magnet, which are divided axially. The U-shaped soft magnet comprises a side wall and a bottom surface. The first permanent magnet of the magnet stack is connected with the bottom surface of the U-shaped soft magnet and forms a uniform annular space with the side wall. The first permanent magnet magnetizes axially. The coil comprises a first coil, and the inner wall of the first coil matches the periphery of the first soft magnet. The first coil can slide axially in the annular space without hindrance. Furthermore, the magnet stack comprises a second permanent magnet and a second soft magnet divided axially. The second permanent magnet is adjacent to the first soft magnet and the second soft magnet. The second permanent magnet magnetizes axially, and its polarity is opposite to that of the first permanent magnet. 
         [0019]    A supplementary soft magnet could be added in the embodiment above. The supplementary soft magnet is disposed between the basket and the U-shaped soft magnet and arranged in a way to reduce the magnetic resistance between the second soft magnet and the U-shaped magnet. 
         [0020]    The supplementary soft magnet may include a protruding portion extending towards the second soft magnet. A corresponding indented section is disposed in said basket. The indented section is geometrically compatible with the protruding portion, so that it does not affect the axial movement of the moving component. Meanwhile, the protruding portion-indented section structure can prevent rotation of the moving element. 
         [0021]    Regarding to the structure with two soft magnets, said coil comprises a second coil. The basket, the second coil and the first coil are fixed relative to each other. The winding direction of the second coil is opposite to that of the first coil. The inner wall of the second coil is compatible with the side wall of the second soft magnet, allowing the second coil to slide axially in the annular space with no resistance. Adding the second coil can further enhance the electromagnetic force and reduce the heat generated by the coil. 
         [0022]    The lead wires of the coil, including a connection terminal and a lead wire spring, can be arranged in the following manner. One end of the lead wire spring is passed through the stationary element and connected to the connection terminal, and the other end is connected to the coil wire. The spring part of the lead wire spring is disposed between the stationary component (element) and the moving component (element). 
         [0023]    Another type of the electromagnetic power device comprises a double solenoid driving device, wherein said moving component (element) is an armature. 
         [0024]    All the electromagnetic power devices mentioned above may be used with the following plunger pump embodiments to produce more specific technical embodiments, which includes a fuel hole, and said plunger hole is roughly round. The plunger closely matches the plunger hole and slides freely in the plunger hole (plunger chamber). The movement of the plunger in the plunger sleeve is driven by the moving component (moving element). 
         [0025]    The plunger comprises a fuel hole and an inlet valve seat surface connected with the fuel hole. The fuel hole runs through the plunger from one end to the other. The seat surface is disposed at one end of the high pressure fuel chamber, including an inlet valve element and an inlet valve spring. The inlet valve element, the inlet valve spring, and the inlet valve seat surface form the inlet valve. The fuel hole runs through the wall of the plunger sleeve. 
         [0026]    All the electromagnetic power devices mentioned above may be used with the following plunger pump embodiments to produce more specific technical embodiments, which include a fuel hole, and said plunger hole is roughly round. The plunger closely matches the plunger hole and can slide freely in the plunger hole. The movement of the plunger in the plunger sleeve is driven by the moving element (moving component). 
         [0027]    In addition, the plunger sleeve assembly includes an inlet valve element, an inlet valve spring and an inlet valve seat. The inlet valve seat is disposed to one end of the plunger hole. The fuel hole communicates with the high pressure fuel chamber through the inlet valve seat. 
         [0028]    A valve rod fixed at the stationary element can be added to the scheme including the inlet valve mentioned above. The valve rod reaches the high pressure chamber through the fuel hole. When it is close to the end of the stroke, the valve rod contacts the inlet valve element and restricts the movement of the inlet valve element, thereby preventing the completely shutdown of the valve. This process can further improve the transient energy output density of the electromagnetic power device and thus increase fuel pressure. 
         [0029]    A fuel supply device could be formed by using at least one of the energy-storing-type high pressure electronic fuel pumps mentioned above. The device further includes a low pressure electronic fuel pump, a solenoid valve type nozzle, and a fuel rail connected with high pressure capacity. The low pressure electronic pump is disposed in the fuel tank, providing fuel to the energy-storing-type high pressure electronic fuel pump. The fuel is compressed by the energy-storing-type high pressure electronic fuel pump, controlled by computer control units, and transported to the fuel rail on demand. Then the fuel is provided to the engine quantitatively by the solenoid valve type nozzle. 
         [0030]    Further, a plunger mechanical pump driven by cams can be added in the schemes mentioned above. The low pressure electronic fuel pump provides fuel to the plunger mechanical pump and the fuel is transported to the fuel rail. In the form of a fuel supply, once the engine is charged (starts), the energy-storing-type high pressure electronic fuel pump immediately supplies the fuel rail with fuel until the pressure in the fuel rail reaches the set value, And the plunger mechanical pump will be driven by the engine. After the engine is running, the plunger mechanical pump transports the fuel to the fuel rail. In the practical application, this method can not only allow the quick establishment of the fuel rail pressure before the engine starts, but can also further increase the capacity of the fuel rail and reduce the pressure fluctuation. 
         [0031]    An injection device injecting fuel directly in the cylinder can be formed by using the energy-storing-type high pressure electronic fuel pump mentioned above and a pressure opening type nozzle. This device does not need fuel rail, and is simple, reliable and cheap. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0032]    The following drawings and descriptions for implementation provide further detailed description of the invention. 
           [0033]      FIG. 1 . The structure diagram of the first embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0034]      FIG. 2 . The structure diagram of the second embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0035]      FIG. 3 . The structure diagram of the third embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0036]      FIG. 3 a   . The structure diagram of the supplementary soft magnet of the third embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0037]      FIG. 3 b   . The structure diagram of the basket of the third embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0038]      FIG. 4 . The structure diagram of the forth embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0039]      FIG. 5 . The structure diagram of the fifth embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0040]      FIG. 6 . The structure diagram of the sixth embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0041]      FIG. 7 . The structure diagram of the seventh embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0042]      FIG. 8 . The structure diagram of the eighth embodiment of the energy-storing-type high pressure electronic fuel pump. 
           [0043]      FIG. 9 . The composition diagram of the first embodiment of the fuel supply device. 
           [0044]      FIG. 9 a   . The structure of the pump combination of the first embodiment of the fuel supply device. 
           [0045]      FIG. 10 . The composition diagram of the second embodiment of the fuel supply device. 
           [0046]      FIG. 11 . The composition diagram of the third embodiment of the fuel supply device. 
       
    
    
     DETAILED DESCRIPTION 
       [0047]      FIG. 1  shows the structure diagram of the first embodiment of the energy-storing-type high pressure electronic fuel pump. The energy-storing-type high pressure electronic fuel pump, including an electromagnetic power device  100 , a plunger sleeve assembly  200 . The electromagnetic power device, including a moving element  101 , stationary element  199  and energy-storing spring  102 . The stationary element  199  and the moving element  101  constitute a main body of a voice coil motor. 
         [0048]    The plunger sleeve assembly  200 , including a plunger sleeve  201 , a plunger  211 , a return spring  209 , an inlet valve constituted by an inlet valve element  204 , an inlet spring  206  and an inlet valve seat surface  205 , an outlet valve constituted by an outlet valve element  212 , an outlet valve spring  215 , an outlet valve spring seat  216  and an outlet valve seat surface  213 , an outlet sleeve  219  containing a high pressure capacity  217 . The plunger sleeve  201  comprises a plunger hole  208 . One end of the plunger hole  208  is connected to a fuel hole  203  through the inlet valve seat surface  205 ; the other end is incorporate into the plunger  211  and participates in the formation of a high pressure fuel chamber  208   a.  The plunger sleeve  201  contains a plunger sleeve spring seat  210 . The plunger  211  comprises a central fuel channel  211  a connecting the high pressure fuel chamber  208   a  to the outlet valve seat surface  213 . The outlet valve element  212  and the outlet valve spring  215  are disposed in an outlet valve chamber  214 , which is connected with a high pressure capacity  217  though an outlet fuel channel  216   a.  The plunger  211  is sealed with the outlet sleeve  219 . The outlet valve spring seat  216  is fixed at the outlet sleeve  219  by pressing or other ways. The outlet sleeve  219  contains a high pressure joint  218  which is used to connect to high pressure fuel circuit. 
         [0049]    The moving element  101  comprises a first coil  103 , a second coil  180 , basket  108  and its integrated designed coil skeleton  104 , and a connector  106 . The winding direction of the first coil  103  is opposite to the second coil  180  and the two coils are connected in series. The basket  108  includes a basket hollow  180   a  used to reduce the movement resistance and allow the fuel to run through, channels  119   a  and  119   b  allowing the passage of coil wires. The basket  108  connect with the first coil  103  and the second coil  180  through rigid connection, thus transferring the force generated by the coils to the energy-storing spring  102  and the plunger sleeve  201 . 
         [0050]    The stationary element  199  comprises a magnet stack  109 , U-shaped magnet  115 , and an upper lid  107 . The magnet stack  109  comprises a first permanent magnet  111 , a first soft magnet  113 , a second permanent magnet  110 , and a second soft magnet  114 . The U-shaped soft magnet  115  comprises a low pressure fuel return path  118 . The upper lid  107  comprises a low pressure fuel enter path  117 . The magnet stack  109  is a cylinder containing a central hole. The U-shaped soft magnet  115  comprises a circular shaped side wall  115   a  and a bottom surface with a central hole  115   b.  The magnet stack is fixed on the bottom surface  115   b  and forms a uniform annular space  120  with the side wall  115   a.  A valve rod  207  is fixed on the upper lid  107  and reaches to the high pressure fuel chamber  208   a  through the fuel hole  203 . The first soft magnet  113 , the second soft magnet  114  and the U-shaped soft magnet are made from soft magnet materials. The plunger  211  and the outlet sleeve  219  pass over the central holes of the magnet stack  109  and the bottom surface  115   b  and are fixed with each other. 
         [0051]    The energy-storing spring  102  functions between the basket  108  and the upper lid  107 . A lead spring  105   a  and a lead spring  105   b  are pressure springs and also function between the basket  108  and the upper lid  107 . The lead spring  105   a  and the lead spring  105   b  also have certain energy-storing capacity. One end of the lead spring  105   a  and one end of the lead spring  105   b  connect two terminals of a connector  106  in a conductive way respectively; the other ends connect two wire taps of the first coil  103  and the second coil  180 . A sealing element  116   a  and a sealing element  116   b  are used to seal between the wire and the walls of the upper lid  107 . 
         [0052]    The axial movement range of the first coil  103  keeps around the first soft magnet  113 , and the axial movement range of the second coil  180  keeps around the second soft magnet  114 . The outer diameters of the first soft magnet  113  and the second soft magnet  114  may be slightly larger than the first permanent magnet  111  and the second permanent magnet  110  to ensure that the moving element  101  can slide smoothly on the surfaces of the first soft magnet  113  and the second soft magnet  114 . 
         [0053]    The return spring  209  functions between the plunger sleeve spring seat  210  and the magnet stack  109 . 
         [0054]    A complete working process of the energy-storing-type high pressure electronic fuel pump is: fuel enters a low pressure fuel chamber  198  through the fuel enter path  117 . When the forward current passes through the first coil  103  and the second coil  180 , the moving element  101  pushes the energy-storing spring  102  upward, under the influence of the radial magnetic field of the first soft magnet  113  and the second soft magnet  114 . Said upward push is a fuel suction stroke of the plunger sleeve assembly  200 . Meanwhile the return spring  209  also pushes the plunger sleeve  201  upward. Next, the inlet valve spring  206  pushes the inlet valve element  204  upward. At the same time, because of the differential pressure, the fuel in the low pressure fuel chamber  198  pushes the inlet valve element  204  to start and enter the high pressure fuel chamber  208   a.  When the moving element  101  is close to the limit of the upper lid  107 , the valve rod  207  limits the inlet valve element  204  to seat. When the moving element  101  reaches the limit of the upper lid  107 , an initial space G formed between the inlet valve element  204  and the inlet valve seat  205 . At this point, the high pressure fuel chamber  208   a  has been filled or close to full fuel. When the reverse current passes through the first coil  103  and the second coil  180 , the moving element  101  pushes the plunger sleeve  201  downward, under the influence of the radial magnetic field of the first soft magnet  113  and the second soft magnet  114 . Meanwhile the energy-storing spring  102  also pushes the plunger sleeve  201  downward. Before the inlet valve element  204  leaves the valve rod  207 , the plunger sleeve  201  slides along the plunger  211  without resistance. Element of the fuel as well as possible gases in the high pressure fuel chamber  208   a  is pushed into the low pressure fuel chamber  198  through the fuel hole  203 . During this process the work of electromagnetic field and the release of the energy from the energy-storing spring  102  are converted to the kinetic energy for the plunger sleeve  201  and the moving element  101 . At the moment when the valve rod releases from the inlet valve element  204 , the inlet valve  207  is seated in the inlet valve seat  205 . At this point the plunger sleeve  201  moves further downward to start pressing the fuel in the high pressure fuel chamber  208   a.  When the fuel pressure in the high pressure fuel chamber  208   a  is higher than the sum of the pretightening force of the outlet valve  215  and the fuel pressure in the outlet valve chamber  214 , the high pressure fuel enters the high pressure capacity  217 . 
         [0055]    In said process, the moving element  101  pushes upward and stores the energy from magnetic field work in the energy-storing spring  102 , while when the moving element  101  begins pushing downward, the moving element  101  stores the magnetic field work in the form of kinetic energy in the moving element  101  and the plunger sleeve  201 . The sum of the stored energy will be released for compression of the fuel in the high pressure fuel chamber  208   a  in the process of downward push of the moving element  101 . Thus, the fuel pressure will be significantly improved compared to the non-energy-storing system. Therefore, the sum of the energy stored could be changed by adjusting the initial space G. 
         [0056]    In said process, an ordinary fuel circulating pump can be connected externally between the fuel enter path  117  and the fuel return path  118 , in order to allow the heat in the low pressure fuel chamber  198  to be taken away in time. 
         [0057]      FIG. 2  shows the structure diagram of the second embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0058]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the moving element  101  of the second embodiment only comprises the first coil  113 , and the stationary element  199  only comprises the first permanent magnet  111  and the first soft magnet  113 . The movement range of the first coil  113  keeps around the first soft magnet  113 . The rest of the structure and working process is the same as the first embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0059]    The working process of the embodiment is the same as the first embodiment of the high pressure electronic fuel pump. 
         [0060]      FIG. 3  shows the structure diagram of the third embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0061]    Compared to the second embodiment of the energy-storing-type high pressure electronic fuel pump, the second permanent magnet  103  and the second soft magnet  114 , as well as a supplementary soft magnet  122 , are added to the stationary element  119  of the third embodiment. These additions will strengthen the magnetic field intensity around the first soft magnet  113 , and thus improve the efficiency of energy conversion. 
         [0062]    The structure of the supplementary soft magnet  122  is shown in  FIG. 3 a   . The supplementary soft magnet  122  contains a uniform magnetizer  122   a  and two convexities  122   b  and  122   c.  Accordingly, the basket  108 , whose structure is shown in  FIG. 3 b   , contains two concavities  198   a  and  198   b.  The concavities  198   a  and  198   b  are geometrically compatible with the two convexities  122   b  and  122   c,  so that the supplementary soft magnet  122  does not affect the free movement of the basket  108 . The two convexities  122   b  and  122   c  can limit the rotary motion of the basket  108 . The supplementary soft magnet  122  can reduce the magnetic resistance between the U-shaped soft magnet  115  and the second soft magnet  114 . 
         [0063]    The working process of this embodiment is the same as the second embodiment of the high pressure electronic fuel pump. 
         [0064]      FIG. 4  shows the structure diagram of the fourth embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0065]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the structure of this embodiment is the plunger sleeve assembly  200 . The plunger sleeve assembly  200  comprises a plunger sleeve  201  closed at one end and an fuel inlet hole  203  which is disposed on the side wall of the plunger  211  and connected with the central fuel channel  211   a.    
         [0066]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the working process of this embodiment is that, while the plunger sleeve  201  is moving along with the moving element  201  upward, the fuel inlet hole  203  opens, and then the fuel in the low pressure fuel chamber  198  enters the high pressure fuel chamber  208   a  due to the differential pressure, and then the moving element  201  continues moving upward until it is limited. At the starting stage of the downward movement of the plunger sleeve  201  with the moving element  101 , before the fuel hole  203  is covered by the plunger sleeve  201 , the plunger sleeve  201  and the moving element  101  move with no resistance under the actions of the energy-storing spring  102  and the electromagnetic force. The work of the electromagnetic energy at this stage and the energy release of the energy-storing spring  102  will be stored in the form of the kinetic energy in the moving element  101  and the plunger sleeve  201 . After the plunger sleeve  201  moves further downward to cover the fuel hole  203 , it starts to compress the fuel in the high pressure fuel chamber  208   a.  When the fuel pressure in the high pressure fuel chamber  208   a  is higher than the sum of the pretightening force of the outlet valve spring  215  and the fuel pressure in the outlet valve chamber  214 , the high pressure fuel enters the high pressure capacity  217 . 
         [0067]      FIG. 5  shows the structure diagram of the fifth embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0068]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the structure of this embodiment is the plunger sleeve assembly  200 . The plunger sleeve assembly  200  comprises a plunger sleeve  201  which is sealed with the output sleeve  219  and a plunger  211  containing a plunger spring seat  211   b.  The fuel hole  203  runs through both ends of the plunger  211  along the axial direction. One end is connected to the low pressure fuel chamber  198 , and the other end is connected to the inlet valve seat surface  205 . The plunger sleeve hole  208  is a stepped hole. The plunger  211  enters from the opening end of the plunger sleeve hole  208  and forms the high pressure fuel chamber  208   a.  The other end of the plunger sleeve hole  208  is connected with the outlet valve seat  213 . A valve rod  207 , which is fixed on the upper lid  107 , reaches to the high pressure fuel chamber through the fuel hole  203 . 
         [0069]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the working process of this embodiment is that, when the moving element  101  moves upward and compresses the energy-storing spring  102 , the return spring is also push the plunger  211  upward at the same time, and then the inlet valve spring  206  pushes inlet valve element  204  upward, meanwhile the fuel in the low pressure fuel chamber  198  drives the open of the inlet valve element  204  due to the differential pressure and enters the high pressure fuel chamber  208   a.  When the moving element  101  moves upward and becomes close to be limited by the upper lid  107 , the valve rod  207  limits the inlet valve element  204  to seat. When the moving element moves upward and is limited by the upper lid  107 , the inlet valve element  204  forms the initial space G with the inlet valve seat  205 . At this point, the high pressure fuel chamber  208   a  would have been filled or close to be filled. When the moving element  101  pushes the plunger  211  downward, the energy-storing spring  102  pushes the plunger  211  downward at the same time, and before the inlet valve element  204  leaves the valve rod  207 , the plunger  211  slides along the plunger sleeve hole  208  with no resistance. Element of the fuel in the high pressure fuel chamber  208   a  and possible gases are squeezed into the low pressure fuel chamber  198  through the fuel hole  203 . During this period, the work of the electromagnetic field and the energy release from the energy-storing spring  102  is converted to the kinetic energy in the plunger  211  and the moving element  101 . At the moment when the valve rod  207  breaks away from the inlet valve element  204 , the inlet valve element  207  seats in the inlet valve seat  205 . Then the plunger  211  moves further downward and starts to compress the fuel in the high pressure fuel chamber  208   a.  When the fuel pressure in the high pressure fuel chamber  208   a  is higher than the sum of the pretightening force of the outlet valve spring  215  and the fuel pressure in the outlet valve chamber  214 , the high pressure fuel enters the high pressure capacity  217 . 
         [0070]      FIG. 6  shows the structure diagram of the sixth embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0071]    Compared to the first embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the structure of this embodiment is that, the outlet sleeve  219  is fixed on the upper lid  107 , and the valve rod  207  is fixed on a bottom surface  115   b . The bottom surface  115   b  is a closed plate containing an inner fuel channel  198   a.  The energy-storing spring  102  runs through the central hole of the magnet stack  109  and functions between the basket  108  and the bottom surface  115   b.  The return spring  209  functions between the plunger sleeve spring seat  210  and the outlet sleeve  219 . The basket comprises a central hollow  108   b.  The valve rod  207  runs through the central hollow  108   b  and reaches to the high pressure fuel chamber  208   a  through the fuel hole  203 . 
         [0072]    In said scheme, the central hole of the magnet stack  109  can be a stepped hole with the outer diameter is bigger than the inner diameter, or a blind hole. The valve rod  207  could also be fixed on the magnet stack  109 . 
         [0073]    The working process of this embodiment is the same or similar as the first embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0074]      FIG. 7  shows the structure diagram of the seventh embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0075]    Compared to the sixth embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the structure of this embodiment is that, the U-shaped soft magnet  115  comprises an extension element  190 . A hydraulic sleeve  192  runs through the magnet stack  109  and the U-shaped soft magnet as well as the center of its extension element. In the hydraulic sleeve  192 , there is a perfectly matched hydraulic plunger  188  which can make free movement. There is an energy-storing spring seat  189  fixed in the extension element  190 . The energy-storing spring functions between the hydraulic plunger  188  and the energy-storing spring seat  189 . In the extension element  190 , there is a hydraulic check valve which is normally open. The hydraulic check valve includes a hydraulic valve element  195 , a hydraulic valve seat  196  and a hydraulic check valve spring  194 . The outlet of the hydraulic check valve is provided with a passage  193  which leads to the low pressure fuel source. A hydraulic chamber  191  is disposed between the hydraulic plunger  188  and the hydraulic check valve. The hydraulic chamber  191  could extend outside of the extension element  190 . The plunger sleeve  201  includes a fuel hole  203  that penetrates the side wall. One end accepts the plunger  211 , and the other end is closed. 
         [0076]    Compared to the sixth embodiment of the energy-storing-type high pressure electronic fuel pump, the difference in the working process of this embodiment is that, when the moving element  101  moves upward and pushes the hydraulic plunger  188 , the hydraulic plunger  188  compresses the energy-storing spring  102 . When the pressure in the hydraulic chamber  191  rises suddenly due to the movement of the hydraulic plunger, the hydraulic check valve  195  would overcome the force from the hydraulic check valve spring  194  and thus close the hydraulic check valve seat  196 . At this point, the hydraulic plunger  188  continues moving upward, and the fuel in the hydraulic chamber  191  continued to be compressed, resulting in the continuous built and storage of the energy-storing spring and hydraulic energy at the same time. While the plunger sleeve  201  is moving upward with the moving element  101 , the fuel hole  203  opens, and the fuel in the low pressure fuel chamber enters the high pressure fuel chamber  208   a  due to the differential pressure. Next, the plunger sleeve  201  continues moving upward until it is limited. At the starting stage when the plunger sleeve  201  move downward with the moving element  101 , and before the fuel hole  203  is covered by the plunder sleeve  201 . Under the combined actions of the pressure from the hydraulic chamber  191 , the energy-storing spring  102  and the electromagnetic force, the plunger sleeve  201  and the moving element  101  conduct non-resistance movement to store the energy in the form of kinetic energy. After the plunger sleeve  201  moves further downward and covers the fuel hole  203 , it starts to compress the fuel in the high pressure fuel chamber  208   a.  When the fuel pressure in the high pressure fuel chamber  208   a  is higher than the sum of the pretightening force of the outlet valve spring  215  and the fuel pressure in the outlet valve chamber  214 , the high pressure fuel enters the high pressure capacity  217 . Towards the end of the downward movement, the pressure in the hydraulic chamber  191  drops, and the hydraulic check valve element  195  opens. The fuel in the hydraulic chamber  191 , if there is missing, could be replenished from the low pressure fuel source. 
         [0077]      FIG. 8  shows the structure diagram of the eighth embodiment of the energy-storing-type high pressure electronic fuel pump. 
         [0078]    The energy-storing-type high pressure electronic fuel pump, including an electromagnetic power device  100 , a plunger sleeve assembly  200 . 
         [0079]    The electromagnetic power device, including a moving element  101 , stationary element  199  and energy-storing spring  102 . 
         [0080]    The plunger sleeve assembly  200 , including a plunger sleeve  201 , a plunger  211 , a return spring  209 , an outlet valve constituted by an outlet valve element  212 , an outlet valve spring  215 , and an outlet valve seat surface  213 , an outlet sleeve  219  containing a high pressure capacity  217 . The plunger sleeve  201  comprises a plunger hole  208 . The plunger  211  enters one end of the plunger hole  208  and forms the high pressure fuel chamber  208   a.  The fuel hole  203  runs through the side wall of the plunger sleeve  201 , and is connected to the low pressure fuel chamber  198  and the plunger hole  208 . The plunger  211  comprises the plunger spring seat  211   b.  The return spring  209  functions between the plunger spring seat  211   b  and the plunger sleeve  201 . The outlet valve spring  215  functions between the outlet valve element  212  and the outlet sleeve  219 . The plunger sleeve  201  is connected with the outlet sleeve  219  in a sealed way. The outlet sleeve  219  contains a high pressure joint  218  which is used to connect to high pressure fuel circuit. 
         [0081]    The moving element  101  comprises an armature  132  and a basket  108 . The armature  132  includes an armature fuel path  223 . The basket  108  includes a basket hollow  108   a . The basket  108  is connected with the armature  132  to transfer the force between the armature  132  and the plunger  211 . 
         [0082]    The stationary element  199  comprises a double solenoid drive element, which includes a first solenoid  124 , a second solenoid  123 , a yoke  125 , a first magnetic gap  127  and a second magnetic gap  126 , a upper lid  107 , which includes a fuel enter path  177  and a sealed O-shaped ring, and a terminal  106 . 
         [0083]    The energy-storing spring  102  functions between the upper lid  107  and the armature  132 . The front and rear ends of the armature  132  are disposed near the first magnetic gap  127  and the second magnetic gap  126 , respectively. 
         [0084]    A complete working process of the energy-storing-type high pressure electronic fuel pump is: the fuel with a certain pressure enters the low pressure fuel chamber  198  through the fuel enter path  117 . When the second solenoid  123  is charged, the armature  132  drives the moving element  101  to move upward under the effect of the electromagnetic field force on the second magnetic gap  126 . Said upward movement is the suction stroke of the plunger sleeve assembly  200 . The moving element  101  moves upward and compresses the energy-storing spring  102 . The return spring  209  pushes the plunger  211  upward, and after a certain period of time, the fuel hole  203  is opened. Then the fuel in the low pressure fuel chamber  198  enters the high pressure fuel chamber  208   a  due to the differential pressure. At a time before the upward movement of the moving element  101  and the plunger  211  is limited, the power is interrupted in the second solenoid  123  and the power is charged in the first solenoid  124 . The armature  132  drives the moving element  101  to move downward under the effect of the electromagnetic field force on the first magnetic gap  127 . The plunger  211  moves downward along with the moving element  101 . In the starting stage, before the fuel hole  203  is covered by the plunger  211 , the plunger  211  and the moving element  101  conduct non-resistance movements under the combined actions of the energy-storing spring  102  and the electromagnetic field force. Element of the fuel in the high pressure fuel chamber  208   a  and possible gases are squeezed into the low pressure fuel chamber  198  through the fuel hole  203 . The work of the electromagnetic energy at this stage and the energy release of the energy-storing spring  102  will be stored in the form of the kinetic energy in the moving element  101  and the plunger sleeve  201 . After the plunger  211  moves further downward to cover the fuel hole  203 , the plunger  211  starts to compress the fuel in the high pressure fuel chamber  208   a.  When the fuel pressure in the high pressure fuel chamber  208   a  is higher than the sum of the pretightening force of the outlet valve spring  215  and the fuel pressure in the outlet valve chamber  214 , the outlet valve element  212  leaves the outlet valve seat surface  213 , and the high pressure fuel enters the high pressure capacity  217 . 
         [0085]      FIG. 9  shows the composition diagram of the first embodiment of the fuel supply device. 
         [0086]    An fuel supply device, including a high pressure fuel pump combination  2  comprising two of the energy-storing-type high pressure electronic fuel pumps as shown in  FIG. 1 , a low pressure electronic pump  405 , a pressure regulator  406 , an fuel rail  402 , a solenoid valve type nozzle  403 , an fuel rail pressure sensor  404 , a computer control unit  407 , a low pressure fuel supply pipe  407 , a low pressure fuel return pipe  408 , a pressure regulator low pressure fuel return pipe  408   a,  a high pressure fuel supply pipe  409 , and a fuel tank  410 . 
         [0087]      FIG. 9 a    shows the structure of the pump combination of the first embodiment of the fuel supply device. 
         [0088]    The working process of said fuel supply device is: the low pressure electronic fuel pump  405  supplies of the fuel in the fuel tank  410  to the high pressure fuel pump combination  2  through the low pressure fuel supply pipe  407 . Element of the fuel passes the pressure regulator  406  by the low pressure fuel return pipe  408  and returns to the fuel tank  410  through the pressure regulator fuel return pipe  408   a.  In order to maintain a target pressure in the fuel rail  402 , the computer control unit  401  determines a target fuel supply amount based on the information provided by the fuel rail pressure sensor  404  and the information of the amount of fuel needed by the engine. Then the driving voltage or current as well as its pulse width and frequency of the high pressure fuel pump combination could be determined based on the target fuel supply amount. If needed, the two energy-storing style high pressure fuel pumps could work at different phases or work at the same phase. The computer unit  401  can start the solenoid valve type nozzle  403  to inject fuel directly to the internal combustion engine if needed. The fuel can be gasoline, kerosene, diesel and other biofuels. The low pressure fuel returns to the fuel tank  410  after passing said high pressure fuel pump combination  2  and this process is good for cooling down said fuel device. The role of the pressure regulator  406  is to maintain the pressure of the low pressure fuel supply pipe  407 , in order to prevent the bubble formation which would affect the normal operation of said fuel device. 
         [0089]    When the pressure in the fuel rail  402  is higher than its set value because of the influence of temperature and other factors, the overflow valve  303  will push the overflow valve spring  304  to open the overflow path  306  until the pressure of the fuel rail  402  is lower than the set value. This overflow is mainly used to control the pressure of the fuel rail  402  to prevent the chance that the solenoid valve injector nozzle  403  cannot be opened due to the over high pressure. 
         [0090]      FIG. 10  shows the composition diagram of the second embodiment of the fuel supply device. 
         [0091]    Compared to the first embodiment of the fuel supply device, the difference in the structure of this embodiment is: it comprises an energy-storing-type high pressure electronic fuel pump  1 , a cam driven high pressure pump  413 , a mechanic pump high pressure fuel pipe  412  that is from the high pressure pump  413  to the fuel rail  402 , a mechanic pump low pressure fuel pipe  407   a  leading to the high pressure pump  413 , an electronic pump low pressure fuel pipe  407   b  leading to the energy-storing-type high pressure electronic fuel pump, and an optional storage chamber  411 . The high pressure pump  413  is a commercial high pressure pump widely used in the current market for direct injection engines. 
         [0092]    Compared to the first embodiment of the fuel supply device, the difference in the working process of this embodiment is: the low pressure electronic fuel pump  405 , through the low pressure fuel supply pipe  407 , provides one element of the fuel in the fuel tank  410  to the high pressure pump  413  by the mechanic pump low pressure fuel pipe  407   a,  and the other element of the fuel to the energy-storing-type high pressure electronic fuel pump  1  by the electronic pump low pressure fuel pipe  407   b.  Before or after the engine starts, the computer control unit  401  decides whether the energy-storing-type high pressure electronic fuel pump  1  should provide fuel to the fuel rail  402  based on the information provided by the fuel rail pressure sensor  404 . If the pressure in the fuel rail  402  is lower than the set value, the computer control unit drives the energy-storing-type high pressure electronic fuel pump  1  to provide fuel to the fuel rail  402  through the high pressure fuel pipe  409  and the storage chamber  411 . When the pressure in the fuel rail  402  is higher than the set value, the energy-storing-type high pressure electronic fuel pump  1  stops providing fuel to the fuel rail  402 . 
         [0093]    The function of the storage chamber  411  is equivalent to increasing the capacity of the fuel rail  402 , which can be achieved by directly increasing the capacity of the fuel rail  402 . 
         [0094]    Said fuel supply device can effectively solve the contradiction between the pressure fluctuation and the pressure rising velocity in the fuel rail  402  occurs in the mechanical high pressure pump  413 . It is advantageous for engines to start. It also can improve the precision of fuel supply and simplify the control logic by reducing the pressure fluctuation. 
         [0095]      FIG. 11  shows the composition diagram of the third embodiment of the fuel supply device. 
         [0096]    A fuel supply device comprises an energy-storing-type high pressure electronic fuel pump  1  and an open nozzle  500  that is connected with a high pressure capacity  217 . 
         [0097]    The open nozzle  500  contains a lift valve  501 , a lift valve seat  502 , a lift valve spring  503 , a lift valve spring seat  504 , and a limit element  505 . The lift valve seat  502  includes a lift valve seat surface  506 . 
         [0098]    The working process of said fuel supply device is: In the standby state, the lift valve  501  is seated in the lift valve seat  506  under the function of the lift valve spring  503 , and thus keeps the open nozzle  500  closed. When the fuel pressure in the high pressure capacity  217  can overcome the valve force of the lift valve spring  503 , the lift valve element  501  leaves the lift valve seat  506 , and then the open nozzle  500  opens so that the fuel in the high pressure capacity  217  can be injected in the engine cylinder. While the lift valve element  501  is lifting, the lift valve spring seat  504  meets the limit element  505 , and at the same time the lift valve element  501  has reached its maximum lift. 
         [0099]    All the energy-storing of high voltage electronic fuel pumps provided in this invention, from the first embodiment to the eighth embodiment, could be used in the fuel supply devices provided in this invention, from the first embodiment to the third embodiment. Other further schemes based on the essence of the invention should be protected.