Aftertreatment system, dual fuel system, and methods therefor
AssigneeCummins Power Generation Inc.
InventorsAnkit Sakuja, Srinivas Chakravarthy Bathula
Life of this patent
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Abstract
Systems are provided including a selective catalytic reduction catalyst structured to receive first exhaust gas from a first fuel source of a dual fuel engine system and second exhaust gas from a second fuel source of the dual fuel engine system, a first fuel of the first fuel source differing from a second fuel of the second fuel source, an ammonia slip catalyst positioned downstream of the selective catalytic reduction catalyst to receive a flow of exhaust gases from the selective catalytic reduction catalyst without an intervening catalyst, and an oxidation catalyst positioned downstream of the ammonia slip catalyst to receive the flow of exhaust gases from the ammonia slip catalyst without an intervening catalyst.
Claims20
An aftertreatment system, comprising:
- a selective catalytic reduction catalyst structured to receive first exhaust gas from a first fuel source of a dual fuel engine system and second exhaust gas from a second fuel source of the dual fuel engine system, a first fuel of the first fuel source differing from a second fuel of the second fuel source;
- a sensor configured to measure a system out emissions value;
- a controller communicably coupled to the sensor, the controller configured to:
- receive a signal from the sensor that is indicative of the system out emissions value;
- determine a system out emissions difference based on a difference between the system out emissions value and a target system out emissions value;
- and
- generate a control signal to iteratively adjust a substitution rate of the first fuel as compared to the second fuel that is provided to a cylinder of the dual fuel engine system for combustion within the cylinder based on the difference between the system out emissions value and the target system out emissions value.
A dual fuel system comprising:
- a dual fuel engine system including:
- a first fuel source;
- a second fuel source;
- and
- a cylinder structured to combust a first fuel from the first fuel source and a second fuel from the second fuel source simultaneously;
- an aftertreatment system including:
- a selective catalytic reduction system structured to receive exhaust gases from the cylinder;
- a sensor configured to measure a system out emissions value;
- and
- a controller communicably coupled to the sensor, the controller configured to:
- receive a signal from the sensor that is indicative of the system out emissions value;
- determine a system out emissions difference based on a difference between the system out emissions value and a target system out emissions value;
- and
- generate a control signal to control the dual fuel engine system to adjust a substitution rate of the first fuel as compared to the second fuel that is provided to the cylinder for combustion within the cylinder based on the difference between the system out emissions value and the target system out emissions value.
An aftertreatment method, comprising:
- actuating a first fuel actuator to introduce a first fuel into a cylinder;
- actuating a second fuel actuator to introduce a second fuel into the cylinder;
- combusting the first fuel and the second fuel within the cylinder;
- receiving, from a sensor, a signal indicative of a system out emissions value;
- determining a system out emissions difference based on a difference between the system out emissions value and a target system out emissions value;
- and
- iteratively adjusting a substitution rate of the first fuel as compared to the second fuel that is provided to the cylinder for combustion within the cylinder based on the difference between the system out emissions value and the target system out emissions value.
Dependencies are inferred from the claim text.