Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1989-02-14
1990-06-26
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
123534, 123179L, F02M 6704
Patent
active
049362798
DESCRIPTION:
BRIEF SUMMARY
This invention relates to fuel injection systems for internal combustion engines of the type wherein metered quantities of fuel are delivered to the engine entrained in a gas such as air.
In the past, these type of fuel injection systems have principally been used on relatively large engines, usually of the diesel or heavy oil type. However, the present applicant has developed petrol or gasoline fuel injection systems for relatively high speed engines using the principle of delivering the metered quantity of fuel to the engine by a compressed gas, such as air.
In the application of this type of fuel injection system to automotive and outboard marine engines, commercial considerations require the engine start-up period to be relatively short under a wide range of conditions. In order to achieve start-up within this time limitation, it will be appreciated that the availability of compressed gas at an adequate pressure is essential before start-up can be achieved. However, for cost and other considerations, it is not convenient to provide a relatively large compressed air storage capacity, and there is also the risk of loss of pressure due to leakage, particularly when the engine has been inoperative for a considerable period.
It is usual to provide a compressor driven by the engine as the means of providing compressed air for the injection system, and for economic and energy consumption reasons, it is customary to select the compressor capacity to closely match the air consumption rate of the engine. Thus, under start-up conditions where there is no reserve supply of air at the appropriate pressure, the compressor must complete a number of cycles before the air available for injection of the fuel is at the required pressure.
The above factors contribute to lengthening the period between commencement of the start-up sequence of the engine and the availability of air at the required pressure for injection of the fuel. Accordingly, it is the object of the present invention to reduce the period required to bring the gas used by the fuel injection system up to a pressure adequate for engine start-up.
With this object in view, there is provided in the operation of an internal combustion engine, having a fuel injection system wherein fuel is injected through a selectively openable injector nozzle directly into a combustion chamber of the engine by gas from a pressurised gas system, the step of delivering gas from the engine combustion chamber through the injector nozzle into the gas supply system in response to the existence of an engine start-up sequence.
More specifically, the selectively openable injector nozzle is opened in response to initiation of the start-up sequence for a period during one cycle or each of a number of cycles of at least one combustion chamber of the engine whereby, during that period or periods gas, being predominantly air, is delivered from the combustion chamber to the gas supply system, to increase the pressure of the gas in the gas supply system.
In a multi-cylinder engine the individual fuel injector nozzles of each cylinder may receive gas from a single gas system and accordingly the injection nozzle of only one cylinder may be required to be opened to deliver gas to the gas supply system. However, if desired, the injector nozzles of any number of the cylinders of the engine may be opened during a portion of at least one cycle of the respective cylinder. Where only one injector nozzle is opened to provide gas to the gas system, that nozzle may be opened for a portion of one or more cycles of that particular cylinder. However, where the injector nozzles of more than one cylinder are opened during respective cycles, with a carefully designed gas supply system, it should normally not be necessary to open each injector nozzle during more than one cycle of its respective cylinder.
The injector nozzle may be opened at any time in the cylinder cycle when the pressure in the cylinder is above that required by the gas supply system at start-up. The highest pressure in the cylinder exists clos
REFERENCES:
patent: 1551731 (1923-01-01), Charter
patent: 4693224 (1987-09-01), McKay
patent: 4759335 (1988-06-01), Ragg et al.
patent: 4765304 (1988-08-01), Brown
patent: 4771754 (1988-09-01), Reinke
Argenbright Tony M.
Mates Robert E.
Orbital Engine Company Proprietary Limited
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