METHOD AND APPARATUS FOR CONTROLLING MULTIPLE VARIABLE DISPLACEMENT HYDRAULIC PUMPS

摘要

A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps (102, 103) having connected discharge ports (206) is provided. Each pump (102, 103) includes a swashplate (104) and a control valve (302) for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump (102) and determined a desired second pump discharge pressure control law for a second pump (103). The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps (102, 103) are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve (302) of the first pump is determined using the combined first and second intermediate control variables and the first control law. A desired second control valve setting for the control valve (302) of the second pump is determined using the combined first and second intermediate control variables and the second control law.