CONTROL METHOD AND DEVICE FOR BY-PASS VALVE OF FLUID CIRCUIT

• Main Authors: MICHAEL A COBO, KOEHLER DOUGLAS W
• Format: Patent
• Language: English
• Published: 17.04.2001
• Edition: 7
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a method and a device to control a flow rate of fluid in a fluid circuit 102. SOLUTION: A fluid circuit 102 includes a pump 32 to be driven by an engine 106. The pump 32 supplies fluid to at least one of actuators 44, 45 through valve assembly bodies 120, 122. Additionally, the pump is connected to a by-pass control valve, and the by-pass control valve is connected to a fluid tank. This method includes a step to define a desired flow rate of fluid to be supplied by the pump, a step to find an estimated flow rate of fluid to be supplied by the pump in correspondence with the desired flow rate of fluid and a step to decide a position of the by-pass control valve in correspondence with the estimated flow rate of fluid.