Method for regenerating a particulate filter of an internal-combustion engine

Abstract

The present invention relates to an internal-combustion engine which includes a drive unit (2) provided with a cylinder (8); an exhaust unit (5) comprising a particulate filter (29); a comburent-air supply unit (3) for supplying for the cylinder (8) and the exhaust unit (5); and a unit (4) comprising a high-pressure pumping unit (17) and supplying fuel to the cylinder (8). The internal-combustion engine (1) includes a device (6) for supplying fuel into the exhaust unit (5) for performing post-combustion; and the supply device (6) includes a fuel supply line (33) which is connected to a pressurized-fuel outlet of the high-pressure pumping unit (17), wherein the supply device (6) includes a union (34) which is connected to an outlet pipe (44) of the high-pressure pumping unit (17) and is composed of a constriction (43) along the fuel flow cross-section for damping the pressure fluctuations within an average value 0.5bar.

Description

Background technique [0001] The emissions of diesel-powered internal combustion engines contain large amounts of particulates and are subject to strict anti-fouling regulations. Diesel engines are equipped with particulate filters to retain particulates and meet the anti-fouling parameters specified by existing regulations. The capacity of the particulate filter is limited, and the particulate filter must be periodically regenerated by means of a cycle of burning off the particulates in the filter. The combustion of particulates produces carbon dioxide, which is exhausted from the filter together with exhaust gas and actually ensures the purification of the particulate filter. The need to perform particulate filter regeneration depends on the operating speed of the internal combustion engine and the operating speed transient. In fact, the specific operating conditions of the internal combustion engine generate an exhaust gas temperature that can start to burn the particulates ...

AI Technical Summary

Problems solved by technology

However, the operating speeds and transients that produce the above conditions cannot be maintained for a sufficient period of time to achieve a complete regeneration (purification) of the particulate filter, and therefore in order to perform a complete regeneration (purification) of the particulate filter, the temperature of the exhaust gas and the state of the excess air must be identified and maintained for a sufficient length of time

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