Patent ID: 7020553

Claim:
A signal processing system for a construction machine comprising a prime mover, a variable displacement hydraulic pump driven by said prime mover, a fuel injection device for controlling fuel injection in said prime mover, input means for commanding a target revolution speed of said prime mover, revolution speed detecting means for detecting an actual revolution speed of said prime mover, fuel injection control means for controlling a fuel injection state of said fuel injection device in accordance with the target revolution speed commanded from said input means and the actual revolution speed detected by said revolution speed detecting means, and pump torque control means for controlling a maximum absorption torque of said hydraulic pump in accordance with the target revolution speed commanded from said input means and the actual revolution speed detected by said revolution speed detecting means, wherein said signal processing system further comprises: a plurality of environment detecting means for detecting status variables related to environments of said prime mover or said hydraulic pump and outputting respective corresponding detected environment signals; environment modifying means for receiving the detected environment signals and modifying, in accordance with the detected environment signals, at least one of the fuel injection state of said fuel injection device controlled by said fuel injection control means and the maximum absorption torque of said hydraulic pump controlled by said pump torque control means; communication control means for obtaining, from an external terminal via communication, alteration data for altering one or more computation elements contained in at least one of said fuel injection control means, said pump torque control means and said environment modifying means; computation element altering means for altering the computation elements based on the alteration data obtained by said communication control; and information collecting means for collecting various items of information including the detected environment signals from said environment detecting means, wherein said communication control means outputs the various items of information obtained by said information collecting means to said external terminal via communication, and said communication control means performs communication with respect to said external terminal in a wireless manner.