Patent ID: 8244439

Claim:
A compaction vehicle comprising: a speed adjustment member provided near a driver's seat for an operator running and stopping the vehicle and configured to adjust a running speed of the vehicle; a displacement detection device configured to detect a displacement (S) of the speed adjustment member from a stop operation position of the speed adjustment member; a running drive source for running the vehicle; a drive source controller configured to control the running drive source; a calculation device existing between the displacement detection device and the drive source controller, and configured to receive the displacement (S) and to output a calculated signal (I) over a whole range of the displacement (S) to the drive source controller; a running speed setting switch configured for the operator to operate ON at a desired running speed; and a control signal memory device provided inside the calculation device and configured to memorize a signal (I 1 ) given to the drive source controller, said signal (I 1 ) being generated when the running speed setting switch is operated to ON; wherein in a normal operation when the running speed setting switch has not been operated to ON the calculation device outputs the signal (I) to the drive source controller so that a running speed increases or decreases according to an increase or decrease of the displacement (S); and wherein when the running speed setting switch is operated to ON, the calculation device maintains the ON state, and the displacement (S) is not less than a predetermined value, the calculation device outputs the signal (I 1 ) memorized in the control signal memory device so that the vehicle runs at a constant speed in both forward and backward moving directions of the compaction vehicle.