Method and system for thermal control of aftertreatment
AssigneeCaterpillar Inc.
InventorSylvain J. Charbonnel
Life of this patent
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Abstract
A method for controlling an internal combustion engine system including a catalyst includes receiving a desired output for an internal combustion engine, and receiving sensor information including information indicative of a temperature of the catalyst. The method includes calculating a plurality of sets of engine performance values based on respective sets of candidate control points, the engine performance values including a temperature change rate at which the temperature of the catalyst changes over time, and determining whether the temperature change rate satisfies a minimum warmup rate for the catalyst. The method also includes controlling the internal combustion engine based on a selected set of candidate control points and the minimum warmup rate.
Claims20
A method for controlling an internal combustion engine system including a catalyst, the method comprising:
- receiving a desired output for an internal combustion engine;
- receiving sensor information including information indicative of a temperature of the catalyst;
- calculating a plurality of sets of engine performance values based on respective sets of candidate control points, the engine performance values including a temperature change rate at which the temperature of the catalyst is expected to change over time;
- determining whether the temperature change rate satisfies a minimum required warmup rate for the catalyst;
- and
- controlling the internal combustion engine based on a selected set of candidate control points and the minimum required warmup rate.
A method for controlling an internal combustion engine system including a catalyst, the method comprising:
- receiving a desired output for an internal combustion engine;
- receiving sensor information including information indicative of a temperature of the catalyst;
- calculating a plurality of sets of engine performance values based on respective sets of candidate control points;
- retrieving a minimum required warmup rate of the catalyst based on one or more operating conditions of the internal combustion engine system;
- determining whether at least one set of candidate control points satisfies the minimum required warmup rate;
- and
- updating a control map with the candidate control points based on the minimum required warmup rate.
A control system for an internal combustion engine system, comprising:
- a catalyst configured to receive exhaust from an internal combustion engine;
- a sensor configured to produce a signal indicative of a temperature of the catalyst;
- and
- a controller configured to:
- receive the signal from the sensor;
- determine when the catalyst is in a cold condition based on the signal;
- set a minimum required warmup rate of the catalyst based on the determination that the catalyst is in the cold condition and based on a load condition of the internal combustion engine;
- determine whether to restrict a flow of air by an intake throttle valve to increase a temperature change rate of the catalyst;
- and
- update a control map for controlling the internal combustion engine, the updated control map including a position of the intake throttle valve.
Dependencies are inferred from the claim text.