Patent ID: 7979229
Filing Date: 2011-07-12
Classification: E02F,F04B

Abstract:
1. A displacement control method, comprising: a calculating step of calculating a displacement control signal for driving a proportional electromagnetic valve based on a displacement command; an adjusting step of adjusting a displacement angle of a hydraulic device by driving the proportional electromagnetic valve with the displacement control signal calculated in the calculating step, and applying a displacement control pressure generated from the proportional electromagnetic valve to a displacement adjusting device; and a judging step of judging whether a learning control mode is selected or a normal control mode is selected, wherein the displacement control signal is calculated in the calculating step based on a required displacement control pressure, the required displacement control pressure being based on a reference characteristic representing a relationship between a required displacement control pressure required to provide a displacement angle corresponding to a displacement command and a required displacement control signal required for the proportional electromagnetic valve to generate the required displacement control pressure, the calculating step further comprises when the learning control mode is selected: the calculating step further comprises when the normal control mode is selected: calculating the displacement control signal based on the corrected required displacement control pressure with reference to the reference characteristic.