Patent ID: 7434889
Filing Date: 2008-10-14
Classification: B23D,B28D,E01C

Abstract:
1. A self-propelled concrete saw comprising: a frame supported by a set of front wheels and a set of rear wheels; a prime mover supported by the frame, the prime mover comprising a hydraulic motor that is adapted to drive the set of rear wheels and thereby propel the concrete saw in a forward direction during a cutting or scoring operation at a forward motion speed; a power plant supported by the frame; a drive system associated with the power plant, the drive system being adapted to rotate a diamond impregnated saw blade; and a control system comprising: wherein the controller output signal is generated by the controller during the cutting or scoring operation using a closed loop process comprising: wherein the second step is performed after the first step; wherein if the forward motion speed determined in the first step is determined in the second step to exceed the predetermined maximum forward motion speed, then the controller output signal sent by the controller causes the prime mover to decrease the forward motion speed of the concrete saw and the closed loop process returns to the first step; wherein if the forward motion speed determined in the first step is determined in the second step not to exceed the predetermined maximum forward motion speed, then the closed loop process proceeds to the third step; wherein the fourth step is performed after the third step; wherein if the rotational speed value determined in the third step is determined to be equal to or greater than the predetermined maximum rotational speed value in the fourth step, then the controller output signal sent by the controller causes the prime mover to increase the forward motion speed of the concrete saw and the closed loop process returns to the first step; wherein if the rotational speed value determined in the third step is determined not to be equal to or greater than the predetermined maximum rotational speed value in the fourth step, then the closed loop process proceeds to the fifth step; wherein if the rotational speed value determined in the third step is determined to be equal to or less than the predetermined minimum rotational speed value in the fifth step, then the controller output signal sent by the controller causes the prime mover to decrease the forward motion speed of the concrete saw and the closed loop process returns to the first step; wherein if the rotational speed value determined in the third step is determined not to be equal to or less than the predetermined minimum rotational speed value in the fifth step, then the closed loop process proceeds to the sixth step; wherein the seventh step is performed after the sixth step; wherein if the cutting depth of the saw blade determined in the sixth step is determined to be less than the predetermined depth of cut value in the seventh step, then the controller output signal sent by the controller causes the prime mover to decrease the forward motion speed of the concrete saw and the closed loop process returns to the first step; and wherein if the cutting depth of the saw blade determined in the sixth step is determined not to be less than the predetermined depth of cut value in the seventh step, then the controller output signal sent by the controller causes the prime mover to maintain the forward motion speed of the concrete saw and the closed loop process returns to the first step.