Patent ID: 7269945
Filing Date: 2007-09-18
Classification: E02F,F15B

Abstract:
1. A method for compensating a flow rate at a neutral position of an operation lever of construction equipment, in which the construction equipment has a hydraulic pump connected to an engine, an actuator connected to the hydraulic pump and driving a working unit, a control valve installed on a fluid channel between the hydraulic pump and the actuator, the operation lever manipulated by an operator and generating an operating signal for driving the working unit, means for detecting an operating amount of the operation lever, means for detecting RPM (revolutions per minute) of the engine, a controller controlling the control valve in response to the operating signal depending on the operating amount of the operation lever and the detecting signal depending on the RPM of the engine, the method comprising the steps of: setting a first flow rate required according to the operating amount of the operation lever and a second flow rate required according to the RPM of the engine; evaluating whether the flow rate belongs to a section to be compensated at the neutral position based on a difference between the first flow rate for the operation lever and the second flow rate for compensating the engine rpm; controlling the hydraulic pump to discharge the second flow rate for compensating the engine rpm when the second flow rate for compensating the engine rpm is more than the first flow rate for the operation lever; and controlling the hydraulic pump to discharge the flow rate corresponding to the operating amount of the operation lever when the first flow rate for the operation lever is more than the second flow rate for compensating the engine rpm.