Patent ID: 8758464

Claim:
An exhaust treatment device for a diesel engine comprising a diesel particulate filter (DPF) regeneration control device ( 4 ), an automatic DPF regeneration device 3 an automatic DPF regeneration processing permission or prohibition selection device ( 7 ), and a cancel state integration time computation device ( 17 ), wherein the automatic DPF regeneration processing permission or prohibition selection device ( 7 ) is configured to select permission or prohibition of an automatic DPF regeneration processing via a manual switching operation by an operator, wherein the cancel state integration time computation device ( 17 ) is configured to compute a cancel state integration time of the automatic DPF regeneration processing, and wherein the DPF regeneration control device ( 4 ) is configured to: (I) start (S 3 ) an execution of the automatic DPF regeneration processing once an accumulation estimation value of particulate material (PM) accumulated on a DPF ( 1 ) reaches a start value (J 3 ) of the automatic DPF regeneration processing whereby the automatic DPF regeneration device ( 3 ) raises a temperature of an exhaust gas ( 11 ) passing, through the DPF ( 1 ) and thus the PM gathered at the DPF ( 1 ) is incinerated and removed by heat of the exhaust gas ( 11 ); (II) complete (S 6 ) the execution of the automatic DPF regeneration processing through the automatic DPF regeneration device ( 3 ) once an execution integration time of the automatic DPF regeneration processing reaches an automatic DPF regeneration processing completion time (T 5 ) after the execution of the automatic DPF regeneration processing is started (S 3 ); (III) start cancel processing for canceling the execution of the automatic DPF regeneration processing based on a manipulation of prohibition of the automatic DPF regeneration processing although the DPF ( 1 ) satisfies a condition that the automatic DPF regeneration processing is executed; (IV) start (S 10 ) the cancel processing for canceling the execution of the automatic DPF regeneration processing, when prohibition of the automatic DPF regeneration processing is manually selected by the operator via the automatic DPF regeneration processing permission or prohibition selection device ( 7 ); (V) release a cancel state of the automatic DPF regeneration processing so that the execution of the automatic DPF regeneration processing that was canceled is started (S 3 ), when the permission of the automatic DPF regeneration processing is manually selected through by the operator via the automatic DPF regeneration processing permission or prohibition selection device ( 7 ); and (VI) reset (S 16 ) the execution integration time of the automatic DPF regeneration processing once the cancel state integration time of the automatic DPF regeneration processing exceeds a reset waiting time (T 4 ).