This application is a national stage application under 35 USC 371 of PCT Application No. PCT/EP2014/064306 having an international filing date of Jul. 4, 2014, which is designated in the United States and which claimed the benefit of European Patent Application No. 13175394.9 filed on Jul. 5, 2013, Great Britain Patent Application No. 1317441.2 filed on Oct. 2, 2013, and Great Britain Patent Application No. 1320374.0 filed on Nov. 19, 2013, the entire disclosures each are hereby incorporated by reference in their entirety.
The present invention relates to rail-less high pressure fuel equipment having distributed fuel storage.
High pressure fluid equipment commonly stores high pressure in a common rail prior to flow to the fuel to the injectors. The rail is a large component and recent optimization of engine layout render arrangement of a rail more complex.
Market demands rail-less equipment.
Accordingly, it is an object of the present invention to provide fuel injection equipment (FIE) for an internal combustion engine. The equipment comprises a high pressure fuel source able to flow high pressure fuel via connecting pipes to a plurality of injectors. The FIE is high pressure fuel reservoir-less, a distributed storage for high pressure fuel being arranged in the pipes and in the injectors. FIE are commonly known as “common-rail” systems while the FIE of the present application has no “rail”.
In a first architecture of the FIE, the injectors are all directly connected to the source, each injector having one fuel inlet.
In another architecture of the FIE, the injectors are in-line connected so that they form a daisy chain, the source being connected to an injector of the line, and the injectors having two inlets.
In yet another architecture, the source is connected to another injector of the line, all the injectors having two inlets.
The FIE may comprise a second high pressure source connected to another injector of the line, all the injectors having two inlets.
Typically, the high pressure source comprises a high pressure pump. In certain architecture the source may comprise a plurality of high pressure pumps.
A FIE may comprise a plurality of pumps all connected to a union member. An alternative is that the pumps are connected in series.
The invention is also related to an injector having two inlets so that it can be arranged in a FIE as previously described. The inlets outwardly extend along an axis either parallel or set at an angle, relative to the main axis of the injector.
The inlets may be provided with threaded members so that the pipes can be connected via a nut.
The fuel injector is able to internally withstand from to 4 to 8 cm3 of high pressure fuel.
The present invention is now described by way of example with reference to the accompanying drawings in which:
In the following description, similar elements will be designated with the same reference numbers.
An internal combustion engine 10 is provided with high pressure fuel injection equipment (FIE) 12.
Five alternative architectures of FIE 12 are now described in reference to
A first architecture of the FIE 12 is represented in
During an injection event, the fuel expelled through the spray holes of the nozzle 22 of an injector 16 empties, inside said injector 16, the space that is in the vicinity of the spray holes. Before the following injection event, this space is refilled with the high pressure fuel contained in the pipe 18 and inside the injector 16 itself. An internal reservoir 34, or storage pocket, of high pressure fuel may be accommodated inside the injector for instance as detailed in application number GB1317441.2 filed on 2 Oct. 2013.
A second FIE 12 architecture is sketched in
A third FIE 12 is sketched in
A fourth FIE 12 architecture is represented in
A fifth FIE 12 architecture is represented in
Further alternatives of FIE 12 architecture, not represented, can easily be implemented in increasing the number of pumps 14, creating fluid links between pumps or between injectors.
Five further FIE 12 architectures, referenced sixth to tenth, are now described in reference to
The FIE 12 of the sixth architecture,
In operation, the space emptied by an injection event is quickly refilled with high pressure fuel contained in the pipes 18 connected to the injector 16 and inside the injector 16. As previously detailed, an internal reservoir 34 or storage pocket 34 of high pressure fuel may be accommodated inside the injector for instance as detailed in application number GB1317441.2.
The seventh FIE 12 architecture,
The eighth FIE architecture,
The ninth FIE 12 architecture,
Another alternative is represented by the tenth FIE 12 architecture,
In the ninth and tenth architectures, as in the sixth, only the last injector 16 has a single inlet 20 while the first to fifth injectors 16 have two inlets 20 each.
In previously described FIE architectures it is possible to commonize the utilization of only one type of injector 16, injectors provided with two inlets where, when needed the second inlet can be plugged for instance with a dummy short pipe.
An injector 16 having two inlets 20 is now described in reference to
While GB 1317441.2 is primarily based on low and medium duty injectors, this application was first thought for heavy duty FIE which injectors may withstand 4 to 8 cm3 of high pressure fuel.
Two different embodiments of injector heads 32, each provided with two inlets 20, are represented on
The heads 32 have two inlets 20 and are similar to the head 32 of
Number | Date | Country | Kind |
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13175394 | Jul 2013 | EP | regional |
1317441.2 | Oct 2013 | GB | national |
1320374.0 | Nov 2013 | GB | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2014/064306 | 7/4/2014 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2015/001079 | 1/8/2015 | WO | A |
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