Internal-combustion engines – Precombustion and main combustion chambers in series – Chamber temperature control means
Patent
1991-06-27
1994-07-19
Dolinar, Andrew M.
Internal-combustion engines
Precombustion and main combustion chambers in series
Chamber temperature control means
123276, 123298, F02B 2302, F02M 5302
Patent
active
053299019
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
The present invention relates to a hot surface impact ignition type internal combustion engine and a method of hot surface impact ignition for the same.
Background Art
In direct injection type diesel engines or secondary chamber equipped diesel engines, it is necessary to atomize the fuel injected from the fuel injectors to the combustion chambers or secondary chambers as much as possible to mix it fully with air. Therefore, in such diesel engines, it is attempted to atomize the fuel as much as possible when injecting the fuel from the nozzles of the fuel injectors. Further, when the temperature of the combustion chambers or secondary chambers is low such as at engine startup, the atomization of the fuel is insufficient, therefore the combustion chambers or the secondary chambers are provided with glow plugs so as to heat the air in the combustion chambers or the secondary chambers and thereby promote the ignition of the fuel.
Even if the atomization of the fuel injected from the nozzles of the fuel injectors valves is promoted in this way, it takes a certain amount of time until the fuel is sufficiently mixed with the air and the fuel can be ignited even if glow plugs are provided in the combustion chambers or the secondary chambers and this causes ignition lag. If such ignition lag is caused, when ignition is performed, since a large amount of fuel particles already is present in the surroundings, the surrounding fuel is rapidly burned and therefore the combustion pressure in the combustion chambers or the secondary chambers rapidly rises. If the combustion pressure rapidly rises, not only is the problem of a large noise caused, but also there is the problem of generation of a large amount of NOx due to the higher maximum combustion temperature. Further, in such a diesel engine, it is difficult to uniformly disperse the fuel in the combustion chambers or secondary chambers, therefore a region of insufficient oxygen around the fuel particles inevitably occurred. As a result, a large amount of particulates occurred in this region. In so far as fuel is injected from the nozzles of the fuel injectors while being atomized, it is difficult to shorten the ignition lag and further it is difficult to uniformly disperse the fuel in the combustion chambers or the secondary chambers. Therefore, in so far as the fuel is injected from the nozzles of the fuel injectors while being atomized, a large noise is caused and a large amount of NOx is generated and, further, a large amount of particulates is produced.
Compression ignition type engines have the advantage of a high heat efficiency and if compression ignition were possible for gasoline, methanol, and other low cetane number and high octane number fuels, it would be extremely advantageous economically. Such low cetane number and high octane number fuels, however, have extremely long ignition lag times and therefore compression ignition of such fuels has been considered difficult in the past.
Disclosure of the Invention
The object of the present invention is to provide an internal combustion engine and ignition method enabling the acquisition of excellent combustion by self-ignition using any type of fuel which can be used for an internal combustion engine.
According to the present invention, there is provided an internal combustion engine which has an electrically heated heating member arranged in a combustion chamber and which injects fuel from a nozzle of a fuel injector toward a heating surface of the heating member in the form of a continuous fluid stream and makes the fuel strike the heating surface in the form of an unatomized fluid.
Further, according to the present invention, there is provided an ignition method wherein fuel is injected from a fuel injector to the inside of a combustion chamber in the form of a continuous fluid stream and then makes the fuel strike a heating surface of an electrically heated heating member in the form of an unatomized fluid so as to ignite the fuel dispersed after the impact.
BRIEF DE
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Patent Abstracts of Japan, vol. 9, No. 290, 60128925, Jul. 10, 1985.
Patent Abstracts of Japan, vol. 13, No. 320, 1106920, Apr. 24, 1989.
Dolinar Andrew M.
Nippon Clean Engine Research Institute Co., Ltd.
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