Title:
内燃機関の排気浄化装置
Document Type and Number:
Japanese Patent JP4244652
Kind Code:
B2
Abstract:
An engine exhaust emission control device determines a differential pressure across a diesel particulate filter (DPF) to enable regeneration of the DPF at optimal timing. An ECU estimates the temperature of a differential pressure sensor provided for the DPF from the output of an intake air temperature sensor when the engine is not running, and determines an offset correction factor for correcting the sensor's offset error. The factor is set using the sensor output at this time as sensor's offset error, and stored in a memory. When detecting the differential pressure across the DPF, the temperature of the sensor at this time is estimated, and an offset correction factor that corresponds to this estimated temperature is selected. The sensor outputs are adjusted with this offset correction factor.
Inventors:
Tsukasa Kuboshima
Shinichiro Okugawa
Hironobu Baba
Shinichiro Okugawa
Hironobu Baba
Application Number:
JP2003035276A
Publication Date:
March 25, 2009
Filing Date:
February 13, 2003
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F01N3/02; F01N9/00; F02D45/00; F02D41/02; F02D41/24; F02D41/38
Domestic Patent References:
| JP2002364439A |
Attorney, Agent or Firm:
Motomu Itou