ELECTRIC CONTROL DEVICE FOR HYDRAULIC CIRCUIT

• Main Authors: UNE MASAMI, KASAI MASUO
• Format: Patent
• Language: English
• Published: 06.01.1998
• Edition: 6
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide an electric control device for a hydraulic circuit to improve responsiveness and realize stable control characteristics without arranging a control valve being of special structure. SOLUTION: In a flow control valve 2 and a hydraulic motor 4, a dead zone estimating circuit 16 outputs a positive dead zone width estimated value Dp or a negative dead zone width estimated value Dm to a dead zone compensating circuit 12 from a relation between an input current (i) and a present speed signal Vc according to a mathematical model format according to which a dead zone is determined. The blind sector compensating circuit 12 selects either a positive dead zone estimated value Dp or a negative dead zone estimated value Dm and adds it to a control command signal Iin to output an output signal Iout by a dead zone compensating circuit 12 based on a code for a control command signal Iin. A hydraulic motor 4 is driven by means of a drive flow rate (q) according to an input current (i) responding to the output signal Iout. Further, in addition to dead zone compensation described above, by determining the control command signal Iin through feedback of a present speed signal Vc , feedback correction is also simultaneously performed.