| CPC F01N 3/035 (2013.01) [F01N 3/023 (2013.01); F01N 3/0253 (2013.01); F01N 11/002 (2013.01); F01N 2900/0408 (2013.01)] | 2 Claims |
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1. A regeneration control apparatus for controlling, in an exhaust gas treatment apparatus of a diesel engine including a diesel oxidation catalyst (DOC) disposed in an exhaust passage of an internal combustion engine and a diesel particulate filter (DPF) disposed downstream of the DOC, execution of forced regeneration to remove an exhaust particulate matter (PM) which accumulates on the DPF through a temperature increase of the DPF, the regeneration control apparatus comprising:
a processor and a storage storing a program that controls the processor, the processor including,
a late-post injection amount determination part which determines a late-post my section amount,
wherein the late-post injection amount determination part is configured to determine an upper limit value of the late-post injection amount on the basis of an air excess ratio of exhaust gas flowing into the DOC obtained on the basis of a temperature index of the DOC,
wherein the late-post injection amount determination part includes:
a feedforward control part for determining a base injection amount of the late-post injection amount on the basis of an operation condition of the internal combustion engine; and
a feedback control part for determining a correction injection amount of the late-post injection amount on the basis of a difference between an inlet temperature and a target temperature of the DPF,
wherein the late-post injection amount determination part is configured to determine a sum of the base injection amount and the correction injection amount as the late-post injection amount if the sum is not greater than the upper limit value of the late-past injection amount, and limit the late-post injection amount to the upper limit value of the late-post injection amount if the sum is greater than the upper limit value of the late-post injection amount,
wherein the feedback control part includes a PID (Proportional-Integral-Differential) calculation part, configured to output the correction injection amount of the late-post injection amount through a Proportional-Integral-Differential calculation based on the difference between the inlet temperature and the target temperature of the DPF, and
wherein the late-post injection amount determination part is configured to, freeze an integral action of the PID calculation part for at least a part of a duration of time in which the late-post injection amount is limited to the upper limit value of the late-post Injection amount.
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