US 12,680,486 B1 · Cold start catalyst bypass system

Abstract

An internal combustion engine system includes an internal combustion engine with a plurality of combustion chambers each having a main exhaust valve and a cold start exhaust valve, a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine via the main exhaust valves and an exhaust manifold, and a light-off catalyst bypass system with a bypass passage and a bypass catalytic converter configured to selectively receive exhaust gas from the internal combustion engine via the cold start exhaust valves. A controller is programmed to determine a cold start, long idle, and/or low main catalytic converter temperature condition, deactivate the main exhaust valves to facilitate preventing exhaust gas flow through the exhaust manifold, and activate the cold start exhaust valves to enable exhaust gas flow through the bypass passage and the bypass catalytic converter.

Claims20

Dependent claims

An internal combustion engine system, comprising:

an internal combustion engine with a plurality of combustion chambers each having a main exhaust valve and a cold start exhaust valve;
a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine via the main exhaust valves and an exhaust manifold;
a light-off catalyst bypass system with a bypass passage and a bypass catalytic converter configured to selectively receive exhaust gas from the internal combustion engine via the cold start exhaust valves;
and
a controller having one or more processors and a non-transitory computer-readable storage medium having a plurality of instructions stored thereon, which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
determine a cold start, long idle, and/or low main catalytic converter temperature condition;
deactivate the main exhaust valves to facilitate preventing exhaust gas flow through the exhaust manifold;
and
activate the cold start exhaust valves to enable exhaust gas flow through the bypass passage and the bypass catalytic converter.

6 more elements

A method of operating an internal combustion engine system that comprises:

an internal combustion engine with a plurality of combustion chambers each having a main exhaust valve and a cold start exhaust valve;
a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine via the main exhaust valves and an exhaust manifold;
a light-off catalyst bypass system with a bypass passage and a bypass catalytic converter configured to selectively receive exhaust gas from the internal combustion engine via the cold start exhaust valves;
and
a controller configured to selectively activate/deactivate the main exhaust valves and the cold start exhaust valves, the method comprising:
monitoring, by the controller, a temperature of the main catalytic converter to determine if the temperature is below a predetermined light-off temperature;
deactivating, by the controller, the main exhaust valves when the main catalytic converter is below the predetermined light-off temperature, to thereby facilitate preventing exhaust gas flow through the exhaust manifold;
and
activating, by the controller, the cold start exhaust valves when the main catalytic converter is below the predetermined light-off temperature, to thereby enable exhaust gas flow through the bypass passage and the bypass catalytic converter.

6 more elements

Dependencies are inferred from the claim text.

Cold start catalyst bypass system

Life of this patent

Cold start catalyst bypass system

Life of this patent

Abstract

Claims20