| 摘要 |
PROBLEM TO BE SOLVED: To eliminate influence of working pressure caused by a centrifugal force acting on a hydraulic clutch that performs power transmission for a stopping operation and a starting operation at a tractor for performing both stopping operation and starting operation only through brake operation.SOLUTION: This invention relates to a control device for a tractor in which a main clutch 48 for intermittently connecting or disconnecting a power transmission is arranged at a power transmission passage from an engine 5 to a running device, a changing of working pressure of the main clutch 48 is controlled to such a stop pressure as one not to cause the tractor body to run on the basis of the number of rotation detected by a rotation sensor for a proper shaft reaching to the main clutch 48 through a treading stop operation at a brake pedal, and the work pressure of the main clutch 48 is returned back as releasing of the treading operation of the brake pedal. A thrusting force of a clutch piston under influence of centrifugal force generated through rotation of the main clutch 48 is estimated, and hydraulic pressure of the working oil to be supplied is corrected to change the hydraulic pressure ranging from the non-connected state to the connected state of the main clutch 48.SELECTED DRAWING: Figure 2 |
