Control system for a control valve

• Main Author: Wells, Larry
• Format: Patent
• Language: English
• Published: 22.10.2019
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

Apparatus and methods for controlling a hydraulic cylinder with a control valve in a control system. The control system comprises a voltage level shifter that produces a shift reference voltage (SHRv) substantially equal to the fraction value of a valve power supply voltage (VPSv). A controller produces a control system output voltage (CNTo) with a positive value, a negative value, or a zero value in response to a control input voltage (CNTi) and the VPSv. A voltage converter receives the SHRv and CNTo, and provides a control signal input voltage (CSi) to the control valve. The CSi is greater than the fraction value of the VPSv when the CNTo is the positive value, less than the fraction value of the VPSv when the CNTo is the negative value, and substantially equal to the fraction value of the VPSv when the CNTo is the zero value.