Method and system for regenerating exhaust system filtering and catalyst components using variable high engine idle

Abstract

A method and system for regenerating particulate filters, catalyzed soot filters, and NOx adsorber catalysts for a vehicle having a compression ignition engine.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a system and method of regenerating particulate diesel engine exhaust filters.[0002]The present invention relates to a system and method of regenerating diesel engine exhaust system particulate filters and catalysts.[0003]The present invention further relates to a system and method of regenerating diesel engine exhaust system particulate filters and catalysts, as well as catalyzed and uncatalyzed cordierite, silicon carbide and sintered and unsintered substrates.[0004]The present invention further relates to a system and method of regenerating diesel engine exhaust system particulate filters and catalysts, as well as catalyzed and uncatalyzed cordierite, silicon carbide and sintered and unsintered substrates while running the diesel engine at lower rpms to save on fuel costs and reduce noise.BACKGROUND[0005]Diesel engine exhaust systems include particulate filters, catalyst soot filters, NOx adsorber catalysts, and selecti...

AI Technical Summary

Benefits of technology

[0017]Upon sensing that the exhaust gas temperature is insufficient for the regeneration of filters, a low temperature signal is generated. When the engine control module receives such a low temperature signal, the physical temperature on the air intake tubing of the vehicle before the inlet to the compressor to the air turbocharger is sensed. Fueling strategies are provided in a data look up table in the engine control module based upon the temperature of the ambient air entering the compressor. The lower the sensed temperature of the ambient air, the more fuel is allowed to the engine, thereby causing the engine speed to increase. The increase in engine speed increases the heat of the exhaust gas stream which passes over the filter, cleaning the soot and particulates. Once the filter is clean, the engine control module senses the condition by a pressure sensor. When fuel is being dosed and oxidized across the DOC, soot in the filter burns as a result of elevated temperatures. In addition, the ECM contains data that approximates how much soot is burned from the particulate filter based upon the exhaust gas temperature and the engine air to fuel ratio at the current engine operating condition, and, if the amount of soot burned approximates the amount of soot that should have been burned, fueling is reduced and the process is completed.

Problems solved by technology

When the sensor generates a signal indicating that the exhaust temperature is insufficient for regeneration, raises the temperature of the exhaust and also increases the load on the engine.

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