A control system for a motor - graders, motor - graders and method for controlling a motor - grader

摘要

A control system (12) for a motor - grader (10) of the type comprising a system (14) for leveling a surface, in which the motor - grader (10) further comprises first and second hydraulic cylinder (20, 21) for raising and lowering of the array (14) close to its first and second ends, as well as first and second hydraulic valves (32, 33) for controlling the flow of hydraulic fluid to the first and second hydraulic cylinder (20, 21), and an inclinometer (48) for moving with the system (14) is mounted in order to measure the apparatus output signal a tendency to deliver the inclination of the system (14) with respect to the horizontal along its length, wherein the control system (12) comprises:a hydraulic cylinder position sensor (40) for determining the extended position of the first hydraulic cylinder (20), anda control unit (28), which indicates a the desired height and transverse inclination of the system (14) specifying the control input, the hydraulic cylinder is acted upon by position sensor (40) and on the inclination mes device output responsive valve control signals for the first and second hydraulic valves (32, 33) to provide,the controller (28) for holding the desired height and lateral inclination a first valve control signal for the first hydraulic valve (32) as a function of the through the control input (45) specified desired height, and the control (28) a second valve control signal for the second hydraulic valve (33) as a function of the inclination mes device output and as a function of the through the control input (45) specified transverse inclination, andwherein, during times when the difference between the desired height and the measured height of the system (14) being sufficient for the actuation of the first hydraulic valve (32) and a from - or retraction of the first hydraulic cylinder (20), the control (28) the second valve control signal to the second hydraulic valve (33) exclusively as a function of the first hydraulic cylinder position sensor (40), which the extended position of the first hydraulic cylinder (20) is determined, is provided, so that the second hydraulic cylinder (21) with the first hydraulic cylinder (20) without reference to the inclination mes the apparatus output is extended and retracted.