Internal combustion engine, particularly Otto engine

Details Internal combustion engine, particularly Otto engine Internal combustion engine, particularly Otto engine

1989-03-03

1991-10-15

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Material from exhaust structure fed to engine intake

123568, F02M 2506

Patent

active

050563092

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an internal combustion engine, particularly an Otto engine.
Exhaust recycling systems are provided in internal combustion engines, particularly in so-called Otto engines, for reducing emission of pollutants with the exhaust, particularly nitric oxide. Formation of nitric oxides is dependent on temperature and the oxygen content in the combustion chamber of combustion cylinders. By mixing the exhaust with a fuel-air mixture, both are reduced and the pollutant emission is decreased.
In a known exhaust recycliner system for an Otto engine with carburetor, a second metering member is designed as an annular throttle which connects an exhaust return line with an intake manifold downstream of the carburetor. The exhaust is fed under excess pressure to the gasoline-air mixture in the intake manifold via this annular throttle. The first metering member arranged upstream of change to the second metering member in the exhaust recycling flow, is constructed as a throttle valve which is coupled with the carburetor throttle valve by a rod linkage. At a low intake pipe pressure determined by the position of the carburetor throttle valve, the recycling portion of the exhaust fed to the intake manifold is determined by a position of the throttle valve in the exhaust return line. This throttle valve becomes inactive at a predetermined intake pipe pressure, and the exhaust recycling portion is exclusively determined by the annular throttle and decreases as the intake pipe pressure increasing. It is only permissible to recycle a relatively small amount of the exhaust with this exhaust recycling system is a drop in the output of the internal combustion engine is to be avoided.


SUMMARY OF THE INVENTION

The object of the invention is to provide, the internal combustion engine, in which the mixture preparation for every cylinder is substantially improved, particularly when the fuel is injected into the inlet chamber by a so-called Jetronic, by direct feed of the hot exhaust flowing out of the exhaust return line at high flow velocity to the individual inlet valves. The object of the invention is achieved by forming the second proportioning member which is located downstream i the exhaust recycling flow, as a unit comprising a plurality of turbulence nozzles, one nozzle for each cylinder. A header reservoir is connected downstream of the first proportioning member in the exhaust recycling flow, and separate exhaust return line connect the header reservoir with the turbulence nozzles. The turbulence nozzles produce a very high charging motion in the combustion chamber. The combustion of the fuel-air mixture in the combustion chambers is accordingly substantially improved as a whole, so that a higher exhaust recycling rate can be provided at the same output, which leads to a saving of fuel during every cylinder charge. The internal combustion engine as a whole requires less fuel, already leading to a reduction of the pollutant emission, which is then further reduced with the exhaust recycling system. Turbulence nozzles are known and are used for feeding by-pass air into the combustion chamber of combustion cylinders.
The recycling exhaust is only fed via a turbulence nozzle in each instance which is associated with a respective cylinder executing an intake stroke. This increases the discharge flow speed of the exhaust to the turbulence nozzle and, accordingly, the effect on the charging movement of the mixture fed to the combustion chamber of the respective cylinder of the internal combustion engine.
In an advantageous manner, moreover, the air supply via the intake pipe is in no way impeded, the density of the charge of the combustion chambers is improved and a very accurate control of the exhaust recycling volume is achieved. This also relies on the fact that no exhaust reaches the intake conduit or is introduced there in an uncontrolled manner as long as the respective cylinder does not communicate with the intake conduit for the purpose of suction.
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REFERENCES:
patent: 2354179 (1944-07-01), Blanc
patent: 3512509 (1970-05-01), Daigh
patent: 4117813 (1978-10-01), Yamashita
patent: 4278063 (1981-07-01), Nakamura
patent: 4306533 (1981-12-01), Matsumoto
patent: 4454852 (1984-06-01), Hasegawa
patent: 4475524 (1984-10-01), Eckert
patent: 4693226 (1987-09-01), Choma

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