Particulate collection filter state detection device

摘要

A filter state detection device includes a first pressure detection part, a second pressure detection part, and a filter state determination part. The filter state determination part is configured to include an operation part and a storage part. The operation part is configured to apply Fourier transformation to each of values of first and second pressures to obtain first and second spectral intensities and/or phases at a zero frequency and first and second spectral intensities and/or phases at a predetermined frequency and configured to compare the first spectral intensity and/or phase at a zero frequency and the first spectral intensity and/or phase at the predetermined frequency as a first group against the second spectral intensity and/or phase at a zero frequency and the second spectral intensity and/or phase at the predetermined frequency as a second group to determine a state of a filter.

主权项

1. A filter state detection device, comprising:
a first pressure detection part configured to detect a first pressure at an upstream side of a filter on an exhaust gas flow path; a second pressure detection part configured to detect a second pressure at a downstream side of the filter on the exhaust gas flow path; and a filter state determination part configured to include an operation part and a storage part, the storage part being configured to store values of the first and second pressures and transmit the values of the first and second pressures to the operation part, the operation part being configured to apply Fourier transformation to each of the values of the first and second pressures to obtain first and second spectral intensities and/or phases at a zero frequency and first and second spectral intensities and/or phases at a predetermined frequency and configured to compare the first spectral intensity and/or phase at a zero frequency and the first spectral intensity and/or phase at the predetermined frequency as a first group against the second spectral intensity and/or phase at a zero frequency and the second spectral intensity and/or phase at the predetermined frequency as a second group to determine a state of the filter, wherein the operation part is further configured to include a first sum calculation part configured to calculate a first sum of the first spectral intensity and/or phase at a zero frequency and the first spectral intensity and/or phase at the predetermined frequency, a second sum calculation part configured to calculate a second sum of the second spectral intensity and/or phase at a zero frequency and the second spectral intensity and/or phase at the predetermined frequency, and a difference calculation part configured to calculate a difference between the first sum and the second sum, and wherein the filter state determination part is further configured to determine a state of the filter based on the difference.