US 11,519,317 B1 · Engine systems with exhaust air injection after three-way catalytic converters for non stoichiometric rich operation

Abstract

Engine systems use a three-way catalyst followed by air injection and mixing to convert all hydrocarbons and carbon monoxide under various load conditions when exhaust gas temperature is above 500 degrees Celsius. A three-way catalytic converter is disposed in the exhaust system. A nozzle is configured to inject air into the exhaust system downstream from the three-way catalytic converter. A mixing plate with or without catalyst coatings is disposed in the exhaust system downstream from the nozzle. The mixing plate is bow shaped with a concave shaped side facing the nozzle to enhance carbon monoxide conversion. Optional two way catalytic converters are added downstream from the mixing plate to further reduce tailpipe hydrocarbon and carbon monoxide emissions.

Claims20

Dependent claims

An engine system comprising:

an engine configured to consume fuel and air to generate an exhaust gas stream;
an exhaust system configured to channel the exhaust gas stream from the engine to a tailpipe for emissions;
a catalytic converter in the exhaust system, configured to convert constituents of the exhaust gas stream;
a nozzle configured to inject air into the exhaust system downstream from the catalytic converter;
a mixing plate disposed in the exhaust system downstream from the nozzle;
sensors disposed in the exhaust system;
and
a controller configured to:
receive inputs from the sensors;
compute an air injection rate based on a load on the engine and the inputs;
and
command, based on the computed air injection rate, a supply of the air through the nozzle sufficient to convert the constituents remaining after the catalytic converter.

9 more elements

An engine system comprising:

an engine configured to consume fuel and air to generate an exhaust gas stream;
an exhaust system configured to channel the exhaust gas stream from the engine to a tailpipe for emissions;
a first three-way catalytic converter in the exhaust system;
a second three-way catalytic converter in the exhaust system, the first and second three-way catalytic converters configured to convert constituents of the exhaust gas stream;
an air injection system with a nozzle configured to inject air into the exhaust system downstream from the first and second three-way catalytic converters;
and
a mixing plate disposed in the exhaust system downstream from the nozzle, the mixing plate bow shaped with a concave shaped side facing the nozzle,
sensors disposed in the exhaust system;
and
a controller configured to:
receive inputs from the sensors;
compute an air injection rate based on a load on the engine and the inputs;
and
command, based on the computed air injection rate, a supply of the air through the nozzle sufficient to convert the constituents remaining after the second three-way catalytic converter.

11 more elements

Dependencies are inferred from the claim text.

Engine systems with exhaust air injection after three-way catalytic converters for non stoichiometric rich operation

Life of this patent

Engine systems with exhaust air injection after three-way catalytic converters for non stoichiometric rich operation

Life of this patent

Abstract

Claims20