Abnormality detection apparatus for exhaust gas purification...

Details Abnormality detection apparatus for exhaust gas purification... Abnormality detection apparatus for exhaust gas purification...

2008-07-08

2008-07-08

Greene, Jason M. (Department: 1797)

Gas separation: processes

Filtering

C095S019000, C096S421000, C055S282200, C055S282300, C055S385300, C055S523000, C055SDIG010, C055SDIG030, C060S277000, C060S297000, C060S311000, C073S04050R, C073S049500, C701S102000, C701S114000

Reexamination Certificate

active

07396389

ABSTRACT:
Unless an abnormality exists in piping introducing a pressure from front and rear of DPF22into a differential pressure sensor45, pulsations of pressure propagation through an exhaust passage21is offset in a detection value of a pressure difference of the differential pressure sensor45, and an amplitude of the detection value of the DPF pressure difference resulting from pulsation of the pressure becomes small. If a crack exists in one of the piping3aand3b, the influence of a pulsation of the pressure appears in the DPF pressure difference and the amplitude of the detection value of the DPF pressure difference becomes large. The amplitude of the detection value of the DPF pressure difference is compared with the reference value and is detected as being abnormal when it is large, utilizing the phenomenon described above.

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