| 摘要 |
An engine exhaust gas purification device is disclosed. The purification device has a filter ( 13 ) which traps particulate matter contained in the exhaust gas from an engine; a differential pressure detection sensor ( 16 ) which detects a differential pressure of the filter; a sensor ( 14, 15, 21, 31, 33 ) which detects an engine running state, and a microcomputer ( 22 ). The microcomputer ( 22 ) is programmed to compute an estimated ash amount ASH_a of the filter based on the detected differential pressure; compute an oil consumption amount OC_total based on the detected engine running state; compute an ash density DENS_ASH from the oil consumption amount OC_total and estimated ash amount ASH_a, and compute an ash amount ASH of the filter based on the oil consumption amount OC_total and ash density DENS_ASH.
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