Internal-combustion engines – Charge forming device – Supercharger
Patent
1998-09-01
2000-07-18
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
60280, F02B 3342
Patent
active
060892110
DESCRIPTION:
BRIEF SUMMARY
Spark ignition engines have now been built for over 100 years, and they are constantly improved in view of an increased output and a reduced fuel consumption. However, as considerable improvements have already been realized, only a gradual reduction of the fuel consumption of conventional spark ignition engines is possible. Furthermore, intense efforts have been made recently to reduce the pollutant emissions, the corresponding exhaust gas cleaning systems using different catalysts of which the regulated three-way catalyst has been most successful as it allows a simultaneous conversion of the three principal pollutant constituents.
Pressure wave superchargers, where exhaust gas and air are momentarily brought into direct contact with each other in cells which are open on both sides, are known per se. Different companies have attempted to use pressure wave superchargers in the automobile construction, while most attempts were directed to an increase of the power output of the engine. As far as known, pressure wave superchargers have only been built in series in combination with diesel engines.
EP-A-0 415 128 discloses an engine according to the preamble of claim 1, and it is suggested to minimize the aging process of a catalyst in an internal combustion engine having a pressure wave supercharger by the fact that the catalyst is disposed near the engine and cooled by the charge air.
From the Patent Abstracts of Japan, Vol. 11, No. 392 (M-653), Dec. 22, 1987 & JP-A-62-159 717, a supercharged engine is known at the outlet of which a three-way catalyst is provided which is only activated at slow speed.
DE-C-37 32 301 discloses a device for the purification of the exhaust gas of an internal combustion engine wherein a three-way catalyst is used which is followed by an oxidation catalyst. The temperature increase in the oxidation catalyst is measured and used for a feedback regulation.
On the background of this prior art, it is the object of the present invention to provide a spark ignition engine which allows both a substantially increased specific output and a substantially reduced pollutant emission. This object is attained by the spark ignition engine according to claim 1, which discloses a combination of a spark ignition engine with a pressure wave supercharger, a three-way catalyst, and an additional oxidation catalyst.
Further characteristic features and advantages, as well as means allowing to prevent disadvantages in cold start conditions, in particular, are defined in the dependent claims.
The invention is explained in more detail hereinafter with reference to a drawing of an embodiment. The single FIGURE schematically shows a spark ignition engine according to the invention with an effective exhaust gas cleaning system.
The single FIGURE illustrates the spark ignition engine 1, i.e. an internal combustion engine, a throttle 2 in inlet channel 3, and a three-way catalyst 4 in outlet 15. The engine, which may be any known internal combustion engine such as an automobile or an aircraft engine and whose fan 17 and output 18 are illustrated, and three-way catalyst 4 form a conventional spark ignition engine according to the prior art as described in the introduction.
This conventional spark ignition engine is completed by a pressure wave supercharger 5 which is preferably operated with a charge air cooler 6 in the inlet channel and comprises an electric or mechanical drive 7, as the case may be, which may also be omitted, however, if the pressure wave supercharger is suitably shaped and dimensioned. Air inlet 8 contains an air filter 9 and--in contrast to known pressure wave supercharger systems--a charger throttle 10. Exhaust 11 comprises a second catalyst in the form of an oxidation catalyst 12. The control of the catalysts is effected by lambda probe 13, temperature probe 14, and by the so-called wastegate flap 19.
The arrows in the channels indicate the course of the air and gas flows, and this schematic view shows that the fresh air is taken in at air inlet 8 and supplied to pressure wave supercharger
REFERENCES:
patent: 4553387 (1985-11-01), Mayer
patent: 4702075 (1987-10-01), Jenny
patent: 5709081 (1998-01-01), Bruestle
Koczo Michael
Swissauto Engineering S.A.
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