Patent ID: 8281574

Claim:
An exhaust-gas processing device for a diesel engine loaded on a machine, the device comprising a DPF ( 1 ), a DPF regenerator ( 3 ) arranged upstream of an inlet of the DPF and having an outlet configured to pass exhaust gas to the inlet of the DPF, a controller coupled to the DPF regenerator and configured to presume an amount of PM deposited on the DPF and to control the DPF regenerator, a memory ( 5 ) coupled to the controller, an indicator light ( 6 ) mounted to the machine and coupled to the controller, and which, when activated, sends a message signaling demand for accelerated regeneration, and a user-operated actuator ( 7 ) coupled to the controller and operable to start accelerated regeneration, wherein the memory ( 5 ) stores a plurality of judging values (J 2 ), (J 3 ) regarding an assumed value of the PM deposited amount and a term (T 1 ) for reserving the judgment as to the demand for accelerated regeneration; the plurality of judging values (J 2 ), (J 3 ) comprises a value (J 2 ) for judgment as to the demand for accelerated regeneration and a value (J 3 ) for judgment as to starting the normal regeneration, higher than the judging value (J 2 ); the controller compares the assumed value of the PM deposited amount with the plurality of judging values (J 2 ), (J 3 ); when the assumed value of the PM deposited amount has increased to the value (J 3 ) for judgment as to starting the normal regeneration, the controller automatically enables the DPF regenerator ( 3 ) to start the normal regeneration processing (S 2 ) so as to increase the temperature of the exhaust gas to be passed through the DPF ( 1 ); when the normal regeneration processing is being continued (S 6 ) since it has started (S 2 ), the time when the term (T 1 ) for reserving the judgment as to the demand for the accelerated regeneration has elapsed is regarded as the judging time (T 3 ) as to the demand for accelerated regeneration, at this time (T 3 ) for judgment as to the demand for accelerated regeneration, in the event that the assumed value of the PM deposited amount exceeds the value (J 2 ) for judgment as to the demand for accelerated regeneration, the accelerated regeneration being deemed to be demanded and the controller allowing the indicator light ( 6 ) to start (S 8 ) sending the message to demand the accelerated regeneration; and when the accelerated-regeneration starting operation has been performed by the user-operated actuator ( 7 ), the controller enables the DPF regenerator ( 3 ) to switch the normal regeneration processing over to the accelerated regeneration processing (S 10 ) to increase the temperature of the exhaust gas to be passed through the DPF ( 1 ) so as to accelerate the regeneration speed of the DPF ( 1 ) more than the case of the normal regeneration processing.