Patent ID: 8336299

Claim:
An exhaust gas cleaning system for a construction machine comprising: a diesel engine; a plurality of driven bodies actuated by motive power of the engine; operating means for issuing an operating command to each of the driven bodies; and an automatic idling control system which reduces revolutions of the engine to a low speed when a non-operational state of the operating means continues for a first predetermined time, wherein the exhaust gas cleaning system comprising: a filter disposed in an exhaust system of the engine in order to trap any particulate matter included in exhaust gases; a regenerating device which regenerates said filter by burning off the particulate matter deposited therein; operational sensing means for sensing whether the operating means are in a non-operational state; and a regeneration control device which activates said regenerating device when said automatic idling control system is ineffective and the non-operational state of the operating means is sensed by said operational sensing means and the non-operational state continues for a second predetermined time that is longer than said first predetermined time.