Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
1999-12-28
2001-11-20
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S299000, C060S298000, C060S303000, C060S284000
Reexamination Certificate
active
06318076
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an apparatus for treating the exhaust gas of an internal combustion engine, more particularly an apparatus for treating the exhaust gas of an inter combustion engine, which is capable of purifying the exhaust gas efficiently.
BACKGROUND OF THE INVENTION
One of the evil effects attendants upon the development of the technology and the industry is an environmental pollution. The kind and the reasons of the environmental pollution are much and complicated.
Air pollution, water pollution and noise pollution become the social problems seriously. Then the air pollution mainly depends upon the exhaust gas of the automobile and the exhaust gas causes the headache, the cough and the health trouble.
The exhaust gas is classified into three classes that the exhaust gas from the internal combustion engine, the blow-by gas from the crankcase of the engine and the evaporation gas evaporated in a fuel tank and a carburetor.
The exhaust gas from the combustion engine is a gas exhausted from the engine after igniting the mixed fuel with air. The component of the exhaust gas from the engine includes not only a water vapor, a nitrogen and a carbonic acid gas that inoffensive to the person but also CO, hydrocarbon, nitric oxide, carbon grains and a lead oxide etc that offensive to the person.
Many study have been progressed to remove the harmful material included in the exhaust gas from the combustion engine and discharge the purified gas that is not harmful to the person from long ago.
FIG. 2
shows an apparatus for treating the exhaust gas of an internal combustion engine that is a super ultra low environmental pollution (SULEV) engine made by the HONDA Company of Japan. The apparatus includes an exhaust manifold
30
made with stainless steel having a low thermal conductivity. A catalyst
32
is connected with the exhaust manifold
30
, and a hybrid catalyst
61
and a electrically heated catalyst (EHC)
60
are serially connected to the catalyst
32
FIG. 1
shows an apparatus for treating the exhaust gas of an internal combustion engine that is a super ultra low environmental pollution (SULEV) engine made by the NISSAN Company of Japan. The apparatus includes an EHC
60
and a under floor TWC
62
. The exhaust gas is discharged into the atmosphere through the EHC
60
and the under floor three-way catalyst or three-way catalytic converter (TWC)
62
in turn and purified. An HC-absorber
50
is connected to the rear end of the TWC
62
through the bypass line
51
.
The after treatment device of the exhaust gas according to HONDA uses a catalyst having high density of 1200 cells per square inch having a low efficiency. Therefore, the after treatment device of the exhaust gas according to HONDA is of no practical use.
Furthermore, the after treatment device of the exhaust gas according to NISSAN needs two valves for controlling the large EHC
60
and the under floor TWC
62
, and sometimes the valves are worked wrong. Therefore the exhaust gas is not properly purified.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an apparatus for treating the exhaust gas of an internal combustion engine that is capable of purifying the exhaust gas efficiently and is simple in its construction.
The present invention achieves the above object by comprising an injector atomizing the fuel, a valve for shutting off the cooling water which flows into a cylinder head, an exhaust manifold increasing the fluidity of the exhaust gas, a close-coupled catalyst (CCC) increasing the activation of a catalyst during high loading operation of the engine at low temperatures, an Hydrocarbon absorber (HC-absorber) catalyst including an HC absorber and a TWC catalyst component for removing the HC component in the exhaust gas, and an electrically heated catalyst and a light off catalyst for removing the HC component at high temperatures.
The CC catalyst is comprised of 400 cells per square inch and the rear end of the EHC has a valve for controlling the back pressure to increase the absorbing efficiency of the catalyst, during initial operation of the engine.
The CC catalyst is comprised of 400 cells and the rear end of the EHC has a valve for controlling the back pressure to increase the absorbing efficiency of the catalyst, when the engine is begin to drive.
BRIEF DESCRIPTION OF THE DRAWINGS
The above object and other advantages of the present invention will become more apparent by describing in detail the preferred embodiment of the present invention with reference to the attached drawings in which:
FIG. 1
is a schematic diagram of a prior apparatus for treating the exhaust gas of an internal combustion engine,
FIG. 2
is another schematic diagram of a prior apparatus for treating the exhaust gas of an internal combustion engine,
FIG. 3
is a a schematic diagram of an apparatus for treating the exhaust gas of an internal combustion engine in accordance with the present invention,
FIG. 4
is a graph showing the exhaust characteristic of the TWC in the apparatus according to the present invention,
FIG. 5
is a graph showing the operating principle of the hybrid catalyst system used in the present invention, which is a catalyst system that an HC-absorber is combined with a TWC,
FIG. 6
is graphs showing the output of the oxygen sensor in case of heat-on.
REFERENCES:
patent: 3851629 (1974-12-01), Mayr et al.
patent: 4370950 (1983-02-01), Furukubo
patent: 4605164 (1986-08-01), Hayashi et al.
patent: 5233831 (1993-08-01), Hitomi et al.
patent: 5410875 (1995-05-01), Tanaka et al.
patent: 5538697 (1996-07-01), Abe et al.
patent: 5979157 (1999-11-01), Kungasa et al.
patent: 6029441 (2000-02-01), Mizuno et al.
patent: 6112520 (2000-09-01), Kaiho et al.
Kim In Tak
Kim Yong Sub
Myung Cha Ri
Christie Parker & Hale LLP
Denion Thomas
Hyundai Motor Company
Tran Binh
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