US 6,907,873 B2 · Filter control method and device

Abstract

Increase in quantity of particulates during a prescribed time period is acquired as first difference data (DX) that is based on pressure differential ΔP across a filter (32) and derived from first estimation data (D2) obtained from a first estimation calculator (52) and is simultaneously acquired as second difference data (DY) that is based on integration of the quantity of particulate generation per unit time and derived from second estimation data (D3) obtained from a second estimation calculator (53), and the second estimation data (D3) is corrected using correction data (D4) calculated from the first and second difference data (DX, DY) to acquire corrected second estimation data (D6). A discriminator (73) determines which of the first estimation data (D2) and corrected second estimation data (D6) is suitable data and the regeneration control of the filter is conducted using the so-selected estimation data (Q).

Claims14

Dependent claims

A filter control method that estimates the quantity of particulates deposited in a filter for trapping diesel particulates based on pressure differential across the filter and/or on an integrated value obtained by integrating, with consideration to an engine operating condition, a given quantity of particulate generation per unit time, and conducts filter regeneration control,

which filter control method is characterized in that it comprises:
a step of acquiring, based on the pressure differential across the filter, an increase in quantity of particulates during a prescribed period as a first particulate increase quantity and acquiring, based on the integrated value, a second particulate increase quantity;
a step of deriving from the first and second particulate increase quantities correction data for correcting the integrated value;
and
a step of using the correction data to correct the integrated value to acquire a corrected integrated value,
and in that it conducts regeneration control of the filter using the corrected integrated value or the pressure differential across the filter.

3 more elements

A filter control system equipped with first calculation means for estimating the quantity of particulates accumulated in a filter for trapping diesel particulates based on pressure differential across the filter and second calculation means for estimating the quantity of accumulated particles by integrating, with consideration to an engine operating condition, a given quantity of particulate generation per unit time, and conducts filter regeneration control based on the outputs of the first and second calculation means,

which filter control system is characterized in that it comprises:
means for calculating, based on an output of the first calculation means, an increase in the quantity of accumulated particulates between two different given time points and outputting it as a first output and simultaneously calculating a second output based on an output of the second calculation means and outputting it;
means responsive to the first and second outputs for deriving correction data for correcting the output of the second calculation means;
and
means for acquiring a corrected output by using the correction data to correct the output of the second calculation means,
and in that it conducts regeneration control of the filter using the corrected output and the output of the first calculation means.

3 more elements

Dependencies are inferred from the claim text.

Filter control method and device

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Filter control method and device

Life of this patent

Abstract

Claims14