Ultra-low idle management
AssigneeDeere & Company
InventorsJustin J. Urbanek, Justin E. Fritz, Patrick Keller, Brent M. Hunold
Life of this patent
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Abstract
A work vehicle may include an internal combustion engine, aftertreatment system, and at least one controller. The controller is configured to use a temperature of the aftertreatment system to determine a hydrocarbon level of the aftertreatment system, and set an idle speed of the engine to high idle if the hydrocarbon level is above a hydrocarbon ceiling, to ultra-low idle if the hydrocarbon level is below a hydrocarbon floor, and to low idle if the hydrocarbon level is between the hydrocarbon floor and the hydrocarbon ceiling.
Claims20
A work vehicle comprising:
- an internal combustion engine;
- an aftertreatment system configured to treat exhaust gas from the engine;
- at least one controller in communication with the engine and the aftertreatment system, the at least one controller configured to:
- determine a hydrocarbon level of the aftertreatment system;
- set an idle speed of the engine to high idle if the hydrocarbon level is above a hydrocarbon ceiling;
- set an idle speed of the engine to ultra-low idle if the hydrocarbon level is below a hydrocarbon floor, the hydrocarbon level of the hydrocarbon floor less than the hydrocarbon level of the hydrocarbon ceiling;
- and
- set the idle speed of the engine to low idle if the hydrocarbon level is between the hydrocarbon ceiling and the hydrocarbon floor, engine speed at low idle greater than engine speed at ultra-low idle, engine speed at low idle less than engine speed at high idle.
A method of controlling an internal combustion engine with an aftertreatment system configured to treat exhaust gas from the engine, the method comprising:
- determining a current temperature of the aftertreatment system;
- estimating, using the current temperature of the aftertreatment system, whether a future temperature of the aftertreatment system will be below a minimum aftertreatment temperature;
- setting an idle speed of the engine to high idle if the current temperature of the aftertreatment system is below the minimum aftertreatment temperature;
- setting the idle speed of the engine to ultra-low idle if (i) the idle speed is not set to high idle and (ii) the future temperature of the aftertreatment system is estimated to not be below the minimum aftertreatment temperature;
- and
- setting the idle speed of the engine to low idle if it is not set to ultra-low idle or high idle, the engine speed at ultra-low idle less than the engine speed at low idle, the engine speed at high idle greater than the engine speed at low idle.
Dependencies are inferred from the claim text.