Apparatus for and method of purifying exhaust gas
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United States of America Patent
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Apr 24, 2012
Grant Date -
Oct 28, 2010
app pub date -
Apr 29, 2010
filing date -
Oct 31, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust gas pressure P, exhaust gas temperatures TU and TD on upstream and downstream of a DPF, a rotation speed Ne, a load Q, and an intake flow rate F as various operating conditions are read, and an amount of PM generated for short time Δt is obtained to be added to a PM deposited amount m, and thus, to obtain an initial deposited amount. Exhaust gas properties and a space velocity SV are obtained based on various operating conditions, and the PM deposited amount m after a lapse of the short time Δt is estimated from a PM deposited amount estimation equation “m=m·exp(−B·Δt)” having been derived considering the exhaust gas properties and the space velocity SV. When the PM deposited amount m is equal to or more than a predetermined value, a forced regeneration processing in the DPF is executed, and thereafter, the PM deposited amount m is reset to 0.
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