Internal-combustion engines – Burning by highly compressed air – Oil engine air preheated
Patent
1992-09-15
1996-01-30
Yuen, Henry C.
Internal-combustion engines
Burning by highly compressed air
Oil engine air preheated
123526, F02M 2102
Patent
active
054873622
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a combustion engine of the piston engine type.
BACKGROUND ART
It is known to use Diesel engines, petrol engines and gas engines for running vehicles, ships and other power systems. All the engines are of the Otto engine type and are operated by an amount of air/fuel mixture being ignited in a combustion chamber whereafter the combustion causes an increase in pressure. The increase in pressure does not follow immediately after the ignition, but occurs gradually over a period of time. The ignition mechanism of the Diesel engine is spontaneous ignition optionally combined with a hot-bulb tube during the heating process where the combustible mixture is ignited due to the increase in pressure in the combustion chamber. The other two types of engine, viz. the petrol engine and the gas engine, are ignited by means of a spark from an ignition system. The latter two types of engines do not usually use spontaneous ignition, but if spontaneous ignition is nevertheless established, for instance in a petrol engine, it is accompanied by a disadvantageous effect, viz. the pinking or detonation. Gas engines for running vehicles are usually structured on the principles of petrol engines which are structured either directly for gas or can be converted thereto. A significant difference between the Diesel engine and the petrol engine is found in the compression ratio. The compression ratio for Diesel engines often exceeds 12:1 while the compression ratio for petrol engines seldom exceeds 10:1. The ignition point in the petrol engine is usually in the range of from approximately 12.degree. to approximately 3.degree. before the top dead center (TDC) with the result that the maximum pressure is not reached in the combustion chamber until after the top dead center (TDC).
DISCLOSURE OF INVENTION
The object of the invention is to provide a combustion engine of a high efficiency, and to allow a simple conversion of a Diesel engine into a gas engine, as well as to provide a simple way of increasing the power.
The combustion engine according to the invention is characterised in that the static compression ratio exceeds approximately 15:1, especially in the range of from approximately 15:1 to approximately 20:1, preferably approximately 17:1, and that the ignition point is situated after the top dead center (TDC), especially in the range of from approximately 0.degree. ATDC to approximately 20.degree. TDC, preferably approximately 4.degree. ATDC. As a result, it is possible to achieve an ignition of a fuel, the spontaneous ignition capacity of which at the predetermined compression ratio does not usually suffize. The resulting ignition generates a maximum pressure in the cylinder of approximately 90.degree. ATDC, whereby a high efficiency of the fuel is obtained without simultaneously involving a steep increase in the temperature in the combustion chamber.
An embodiment of the combustion engine according to the invention is such that the fuel includes liquid propane gas (LPG) in form of autogas mixed with air, where the LPG substantially includes propane and butane, and where the air is atmospheric air containing approximately 21% of oxygen. In this manner it is possible to increase the power of the combustion engine by using a conventional fuel of a high purity, where the combustion products are mainly carbon dioxide and water.
Another embodiment of the combustion engine according to the invention is characterised in that it is a six-cylinder engine of 9570 cm.sup.3 with a bore of 125 mm and a stroke of 130 mm, and which is provided with an ignition system, such as of the type Lumenition, an evaporation system, such as of the type Renzo Matic, a carburetion system comprising a Venturi and a standard exhaust system for Diesel rigs. As a result it is possible at low expense to convert a known Diesel engine into a gas engine of a high efficiency.
The combustion engine according to the invention may furthermore be characterised in that the fuel injection system of a Diesel rig including pump
REFERENCES:
patent: 3144857 (1964-08-01), Hesselberg
patent: 4091772 (1978-05-01), Heater et al.
patent: 4176651 (1979-12-01), Backus
patent: 4499885 (1985-02-01), Weissenbach et al.
patent: 4742801 (1988-05-01), Kelgard
patent: 4798184 (1989-01-01), Palko
patent: 5139002 (1992-08-01), Lynch et al.
Russian language 1982 Russian Publication (partial translation).
Andersen Holger S.
Voergaard Flemming
Wellev Jens E.
Alex Jensen A/S, Skibby
Solis Erick
Yuen Henry C.
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