Ignition system for a gas engine

Details Ignition system for a gas engine Ignition system for a gas engine

1998-11-12

2000-10-10

Kwon, John

Internal-combustion engines

Precombustion and main combustion chambers in series

Having specific connecting passage means between...

123260, F02B 1902

Patent

active

061290696

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an internal combustion engine and a method for operating such an internal combustion engine wherein the internal combustion engine has a crankcase in which there is rotatably supported a crankcase in which there is rotatably supported a crankshaft, to which there is articulated at least one connecting rod, which bears a piston that is movable in a cylinder head covered by a cylinder so as to form a working space. An air-gas mixture is supplied to the working space by way of breathing ducts in the cylinder head. A prechamber is recessed into the cylinder head and an ignition chamber is provided in the prechamber. The ignition chamber is opened and closed by a valve.


BACKGROUND OF THE INVENTION

The internal combustion engine shown in U.S. Pat. No. 5,067,458 has a main combustion chamber and an auxiliary combustion chamber inter-connected by a connecting duct. An ignition device is inserted into the auxiliary combustion chamber. The connecting duct can be blocked in order to decouple the ignition device from the main combustion chamber. By this prior art construction, the purging process between the auxiliary combustion chamber and the main combustion chamber is coupled to the ignition time and the auxiliary combustion chamber must be connected to the main combustion chamber over a long working period.
Another ignition system for an internal combustion engine is known from German patent document DE-OS 28 26 807. In this internal combustion engine, in successive working strokes, first an oxygen-containing mixture is compressed and thereby heated as well as thereafter ignited, whereupon the combustion gases expand. This working method is developed because at least part of the fuel employed is heated to at least its ignition temperature before introduction into the process, then injected in the gaseous state into the oxygen-containing mixture in accordance with a law governing the combustion process. This method and a correspondingly designed internal combustion engine require a large constructional effort and are thus expensive in implementation, the ignition control, or respectively, ignition of the mixture still being subject to fluctuations.
Another system is known from British patent GB-A 2, 031 513, which discloses a two-substance system, wherein, pilot fuel is supplied to the internal combustion engine via an injector nozzle, which pilot fuel is ignited by a spark plug. This ignited pilot fuel then ignites the main fuel located in another chamber.


OBJECT AND SUMMARY OF THE INVENTION

It is an object of the invention to furnish an internal combustion engine and a method for operating the internal combustion engine that permits a very exact and reliable determination of the ignition time of the working substance.
According to the invention, this object is achieved by providing an ignition chamber (including ignition device) which is inserted into the prechamber. The ignition chamber can be selectively closed off from the working space at certain times and connected to the working space at other times in order to ignite working substance newly supplied to the working space. The internal combustion engine designed for this method is distinguished in that an ignition chamber is inserted into the prechamber and the ignition chamber can be tightly sealed off from the working space via the prechamber, and in that the ignition chamber contains the ignition device. Reliable initiation and stable combustion of the working substance, which in the supplied state consists of a fuel-air mixture, is guaranteed by this method and this design. The fuel-air mixture is preferably a gas-air mixture, and the present invention is especially useful in stationary gas engines. The known spark ignition for Otto-cycle engines has the disadvantage that flame-core formation and the resulting combustion is subject to strong cyclical fluctuations. In the likewise known method of glow-plug ignition, a combustible gas-air mixture in the combustion chamber is initiated by a glow plug with a h

REFERENCES:
patent: 3945352 (1976-03-01), Reimuller
patent: 4300497 (1981-11-01), Webber
patent: 5067458 (1991-11-01), Bailey
patent: 5826558 (1998-10-01), Kawamura

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