Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1989-01-30
1990-06-19
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
123456, 239408, 2394165, 2394175, 239585, F02M 6908, F02M 5500, F02M 6702
Patent
active
049343297
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fuel injection system for internal combustion engines having two or more cylinders and wherein metered quantities of fuel are delivered to the respective cylinders entrained in a gas, preferably a combustion supporting gas, such as air.
It has previously been proposed to deliver a metered quantity of fuel to an engine entrained in a body of gas, with the pressure of the gas being sufficient to effect delivery of the fuel either directly into the cylinder of the engine or into the induction system through which the air charge passes for delivery to the cylinder. This form of fuel metering and injection requires the supply of both fuel and gas to each metering and injecting unit associated with the respective cylinders of the engine. Also, most fuel metering devices require the fuel to be circulated therethrough to prevent the collection of fuel vapour therein. Accordingly, in a multi-cylinder engine, having an individual fuel metering device for each cylinder, it is necessary to provide for fuel to be returned from each fuel metering device to the principal fuel source, such as the fuel reservoir. Further, it is normally necessary to provide a substantially fixed pressure differential between the fuel supply and the gas supply, as this differential is relevant to the metering characteristics of the fuel metering device, and variations therein can result in inaccuracy in the fuel metering process.
Because of manufacturing cost considerations, it is customary to provide a single pump which provides the fuel circulation from a fuel reservoir to each of the fuel metering devices, with appropriate return lines to the fuel reservoir from each metering device. Also it is customary for cost saving reasons to provide a single pressure regulator to control the pressure differential between the gas and the fuel as supplied to each fuel metering and injecting unit. This construction results in a multitude of fuel lines between the fuel metering and injection units and the fuel pump, and between said units and the pressure regulator, which significantly contribute to manufacturing costs. It will be appreciated that in this construction the fuel and gas lines must be provided with suitable end connectors, which are usually threaded in order to provide an effective leak proof connection, and the provision of complementary threaded components on the fuel metering and injecting units, fuel pump and pressure regualtor. The manufacture and assembly of these multiplicity of threaded components is a further cost factor. Also additional costs are involved in the installing of the numerous fuel and gas lines. Further the multitude of fuel and gas lines detract from the overall neatness of the installation.
The use of the number of lines for the fuel and gas also present operational disadvantages as the resilient nature of the plastic lines usually used results in variations in line cross-sectional area with internal pressure, and so it is difficult to maintain the required control of the pressure differential between the fuel and gas supplies.
In many engine applications, such as automobiles and outboard marine engines, the physical size of an engine and its associated accessories is of major importance. There is limited scope for reduction in the size of the engine itself, and accordingly it is important to maintain to a minimum the extent that accessories, added to the basic engine, increase the overall size thereof.
In the light of the above discussed construction, operational and cost disadvantages of currently known fuel injection systems, it is the object of the present invention to provide an improved system whereby these disadvantages are at least reduced so as to provide a more effective operational system and to also reduce the manufacturing and installation costs of the system.
With this object in view, there is provided according to the present invention a fuel injection system for a multi-cylinder internal combustion engine comprising a rigid elongated unitary member having formed therein
REFERENCES:
patent: 1627727 (1927-05-01), Charter
patent: 3125078 (1964-03-01), Reiners
patent: 3514082 (1970-05-01), Haase
patent: 3782639 (1974-01-01), Boltz et al.
patent: 4197996 (1980-04-01), Giardini
patent: 4360164 (1982-11-01), Bellicardi et al.
patent: 4475486 (1984-10-01), Kessler 123
patent: 4539961 (1985-09-01), Atkins et al.
patent: 4570602 (1986-02-01), Atkins et al.
patent: 4708117 (1987-11-01), Mesenich et al.
patent: 4841942 (1989-06-01), McKay
Lear Mark
Leighton Sam R.
Sayer Christopher N. F.
Thompson Ian R.
Argenbright Tony M.
Orbital Engine Company Proprietary Limited
LandOfFree
Fuel injection system for a multi-cylinder engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injection system for a multi-cylinder engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection system for a multi-cylinder engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2253171