Patent ID: 7689342

Claim:
A compaction vehicle having 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 which runs the vehicle; and a drive source controller configured to control the running drive source, the vehicle comprising: 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) to the drive source controller; a running speed setting switch configured for the operator to operate ON at a desired running speed; a vehicle speed sensor configured to detect a running speed (V) of the vehicle; a control signal memory device provided inside the calculation device and configured to memorize a running speed (V 1 ) 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 calculated signal (I) over a whole range of the displacement (S) to the drive source controller so that the running speed (V) increases or decreases according to an increase or decrease in the displacement (S) of the speed adjustment member, wherein when the running speed setting switch is operated to ON, the ON state of running speed setting switch is maintained, and the displacement (S) is not less than a predetermined value, the calculation device uses the running speed (V) from the vehicle speed sensor as a feedback information and outputs the signal (I) to the drive source controller so that the running speed (V) becomes the running speed (V 1 ) memorized in the control signal memory device; and wherein when the running speed setting switch is operated to ON, the ON state of running speed setting switch is maintained, and the displacement (S) is less than the predetermined value, the calculation device outputs the signal (I) to the drive source controller, making the memorized running speed (V 1 ) as a maximum speed, so as to increase or decrease the running speed (V), depending on the increase and decrease of the displacement.