Method and an apparatus for the treatment of exhaust gas from an IC engine
OwnerOskar Schatzinventor
Life of this patent
Estimating the term…
Abstract
More particularly for the catalytic treatment of the exhaust gas of an IC engine, such as the IC engine of a motor vehicle, in the case of which the gases of combustion flow through a converter, the latter is provided with an emission buffer designed for the cold start state. It is capable of storing noxious emissions, more particularly those produced during a cold start, such as unburned hydrocarbons and to release them into the exhaust gas again.
Claims28
A method for the treatment of the exhaust gas of internal combustion engines comprising the steps of:
- providing an exhaust gas means for exhausting gas from the engine outlet to a converter, an emission buffer is coupled with the exhaust gases means, a heat exchanger having two distinct flow paths coupled with said exhaust gas means and said emission buffer positioned in one of said flow paths, and valve means for directing exhaust flow through the exhaust means;
- directing substantially all of the exhaust flow, via said valve means, from the engine into the heat exchanger flow path including said emission buffer at start up of the engine;
- storing noxious emissions, temporarily, in the emission buffer during start up of the engine as exhaust flow passes into said emission buffer;
- heating said emission buffer to a desired temperature with the exhaust gas flow passed into said heat exchanger;
- releasing said noxious emissions from said emission buffer, after heating of said emission buffer, and passing said released noxious emissions into said converter;
- directly bypassing said emission buffer with the exhaust gases flow, via said valve means, upon reaching a desired temperature;
- and
- passing said exhaust gas flow from said engine directly to said converter.
An apparatus for treatment of exhaust gas comprising an internal combustion engine and a converter placed in an exhaust gas duct which connects said engine with said converter;
- a heat exchanger having two distinct flow paths including an emission buffer positioned in one of said flow paths coupled with said exhaust gas duct, said emission buffer including means for temporarily storing noxious emissions from said engine at start up of said engine and said means releasing said stored noxious emissions back into said exhaust gas duct after said emission buffer has reached a desired temperature;
- and
- valve means for directing exhaust gas flow through said exhaust gas duct such that substantially all of the exhaust flow is passed through said heat exchanger flow path including said emission buffer at start up and upon reaching a desired temperature, said valve means directs said exhaust gas flow directly to said converter bypassing said emission buffer.
Dependencies are inferred from the claim text.