Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...
Patent
1992-03-25
1993-11-02
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Fuel flow regulation between the pump and the charge-forming...
1372075, B67D 554, F02D 3900
Patent
active
052576086
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device in a fuel system for an internal combustion engine with a fuel injection device, said fuel system comprising a fuel tank, a feeder line for feeding fuel from the fuel tank to the fuel injection device and a return line for returning excess fuel from the fuel injection device to the fuel tank.
More and more internal combustion engines are being provided with fuel injection devices, which permit, with the aid of various mechanical and/or electronic control means, exact regulation of the fuel supply to the engine in response to various operating parameters. The fuel systems for feeding fuel to the engines are usually designed as circulation systems, there being a feeder line with a pump for supplying fuel to the fuel injection device and a return line for returning excess fuel to the fuel tank. The pump has sufficient capacity to provide a fuel flow corresponding to a maximum fuel consumption. At lower fuel comsumption, the excess fuel is returned to the fuel tank.
When servicing the components of the fuel system or replacing such components, it is necessary to at least partially disassemble the fuel system. Due to the fact that the fuel system contains a relatively large number of components, it also contains a relatively large amount of fuel which will flow out when the fuel system is disassembled. This can give rise to problems, since the fuel usually contains environmentally dangerous components which are, for example, toxic, inflammable and/or allergenic. There is therefore a clear need to reduce fuel spills in workshops and similar places.
The invention intends to solve the above mentioned problem and provide a device of the type described by way of introduction which makes it possible to reduce to a negligible amount fuel spills when servicing or repairing the fuel system. This is achieved by a device with the features disclosed in the characterizing clause of claim 1.
Suitable embodiments of the device according to the invention are defined in the subclaims.
The invention will be described in more detail below with reference to the accompanying drawings, of which
FIG. 1 is a schematic view of a fuel system with a device according to one embodiment of the invention,
FIG. 2 shows a schematic view of a second fuel system with the device according to an embodiment of the invention, and
FIG. 3 shows a partially cut-away view of a coupling included in a device according to the invention.
FIG. 1 shows schematically a combustion engine 1 provided with a fuel system with a device according to the invention. The fuel system comprises a fuel tank 2, a feeder line 3 for feeding fuel from the fuel tank 2 to a fuel distributor pipe 4 in a fuel injection device and a return line 5 for returning excess fuel to the fuel tank 2. The fuel injection device comprises, in addition to the distributor pipe 4, a number of injector pipes 6 extending from the distributor pipe 4 to individual injector valves 7, via which fuel is injected into the engine intake pipes (not shown).
In the fuel tank 2 there is a fuel pump 8, connected to the feeder line 3 for feeding fuel to the distributor pipe 4 in the fuel injection device. The fuel pump 8 is provided with a check valve to prevent back flow of fuel through the feeder line 3 when the fuel pump 8 is not operating. In the feeder line 3 there is also a fuel filter 9. The return line 5 contains a pressure regulator 10 to maintain a predetermined pressure in the fuel injection device, e.g. in the distributor pipe 4 and the injection pipe 6 as well as in the feeder line 3.
In the feeder line 3 there is also a coupling 11, which is shown in more detail in FIG. 3 and will be described in more detail below.
FIG. 2 shows an internal combustion engine 1 with a fuel system which is somewhat modified from that shown in FIG. 1. The components which have direct counterparts in FIG. 1 have been provided with the same reference numerals. In the embodiment shown in FIG. 2, the fuel pump 8 in the fuel tank 2 is a pre-pump without any check valve. Furthermore, there
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AB Volvo
Cross E. Rollins
Moulis Thomas
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