EXHAUST PURIFICATION SYSTEM

摘要

An exhaust purification system includes: a diesel oxidation catalyst (DOC) provided on an exhaust path of an engine; an upstream diesel particulate filter (DPF) and a downstream DPF that are provided on the exhaust path at positions downstream of the DOC to collect particulate matter contained in exhaust gas; electrodes that detect a capacitance of the upstream DPF; a particulate matter accumulation estimating unit that estimates at least an amount of particulate matter accumulated in the downstream DPF on the basis of the capacitance received from the electrodes; and a forced regeneration control unit that injects fuels into the DOC and performs forced regeneration that burns and removes at least the particulate matter accumulated in the downstream DPF when the estimated amount of particulate matter from the particulate matter accumulation estimating unit surpasses a predetermined amount.

主权项

1. An exhaust purification system comprising:
an oxidation catalyst provided in an exhaust passage of an internal combustion engine; a pair of first and second filters provided in the exhaust passage at positions downstream of the oxidation catalyst to collect particulate matter contained in exhaust gas; an electrostatic capacity detecting unit configured to detect an electrostatic capacity of the first filter; an accumulation amount estimating unit configured to estimate an amount of accumulated particulate matter at least in the second filter based on the electrostatic capacity entered from the electrostatic capacity detecting unit; and a filter regenerating unit configured to execute a forced regeneration to burn and remove the particulate matter that has accumulated at least in the second filter by injecting fuel to the oxidation catalyst when the amount of accumulated particulate matter entered from the accumulation amount estimating unit exceeds a predetermined amount.