Patent ID: 8601799

Claim:
A construction machine comprising: an engine; an exhaust pipe connected to the engine; an exhaust gas purifying device having a filter installed in the exhaust pipe, the exhaust gas purifying device being operable to purify exhaust gas discharged from the engine through the exhaust pipe, by using the filter; a pump driven by the engine so as to discharge hydraulic oil; an actuator connected to the pump via a flow passage and adapted to be operated in response to supply of hydraulic oil from the pump thereto through the flow passage; an actuator control valve provided in the flow passage between the pump and the actuator to control the operation of the actuator; a manipulation device having a manipulation section adapted to be manipulated by an operator, the manipulation device being operable to output a command for providing an instruction about an operation of the actuator control valve according to the manipulation of the manipulation section; a manipulation-state detection section for detecting the presence or absence of the manipulation of the manipulation section; a command changing regulation section configured to be switched between a changing prohibition mode for, even if a value of the command to be output from the manipulation device is changed, fixing a value of a command which is to be assigned to the actuator control valve, to a value equal to a value of the command to be output from the manipulation device upon the absence of the manipulation of the manipulation section, and a changing permission mode for permitting a value of the command which is to be assigned to the actuator control valve, to be changed according to changing a value of the command to be output from the manipulation device; a loading device for imposing, on the engine, a load for raising an exhaust temperature of the engine up to a value at which particulate matter accumulated in the filter is burnt to allow the filter to be regenerated; and an instruction section for instructing the loading device to perform an operation for loading the engine, wherein the instruction section is operable to prohibit the loading device from changing a loading level, which is a level of load to be imposed on the engine by the loading device, during a period where the manipulation-state detection section detects the presence of the manipulation of the manipulation section, and wherein the command changing regulation section is set to the changing permission mode, during a period where the loading level is constant.