Patent ID: 8905157

Claim:
Control system for the control of pressure fluid supply to consumers being a feed motor, a percussion device and a rotation motor of a rock drilling machine, said system including a regulating valve for each one of the consumers, wherein fluid conduits lead between the regulating valves and the respective consumers, the system having: an electronically controlled auxiliary control unit which includes at least one electrically controlled auxiliary valve for the connection to and intercepting in at least one of the fluid conduits, at least one sensor for sensing prevailing fluid parameter values in respect of at least one member of the rock drilling machine and sending sensor signals to the auxiliary control unit as a sensor input signal actual values, and a processor having at least one parameter sensor input signal entry for receiving said sensor input signal actual values and at least one control signal exit for signal control of a respective auxiliary valve, wherein the processor is arranged to compare said sensor input signal actual values with parameter predetermined values and to emit control signals to at least one of the auxiliary valves as a response to the result of the comparison in order to adjust fluid flow in the fluid conduit related to said at least one of the auxiliary valves.