| 摘要 |
PURPOSE:To enable control without malfunction and erroneous determination by determining the inclination of a position, controlling it, detecting the limit of cylinder rise and fall, and stopping the control section when the hydraulic pressure of a hydraulic cylinder which lets wheels rise and fall for car bodies is detected. CONSTITUTION:Both the right and left front wheels 2L and 2R and rear wheels 5L and 5R are mounted on the car body 1 of a tractor through the parallel links 3L, 3R, 6L, and 6R. The respective wheels 2L, 2R, 5L, and 5R can freely rise and fall for the car body by way of the hydraulic cylinders 4L, 4R, 7L, and 7R. The working oil pressure in each hydraulic cylinder is detected by the pressure detectors 10L, 10R, 11L, and 11R and the inclination of the car body 1 is determined by the relative difference of the detection value. The solenoid valves 8L, 8R, 9L, and 9R are actuated, respectively, so that the car body 1 can become horizontal. Since the limit of the rise and fall of each hydraulic cylinder is detected by the positional transducers 12L, 12R, 13L, and 13R and the function of the control section 209 stops, an error of determination at a steep inclination can be protected. |
