| 摘要 |
A hydraulic system for a work vehicle is disclosed. A preferential flow-dividing valve supplies a fixed amount of oil discharged from a variable displacement pump preferentially to a preferential hydraulic oil section and a surplus oil flow from the pump to a non-preferential hydraulic oil section. A plurality of electromagnetic proportional control valves are provided in the non-preferential hydraulic oil section for controlling oil flows relative to a plurality of hydraulically operated devices provided in the non-preferential hydraulic oil section. A necessary flow rate calculating module calculates a necessary oil flow rate in each of the preferential hydraulic oil section and the non-preferential hydraulic oil section based on a preferential oil flow rate of the preferential flow-dividing valve supplied to the preferential hydraulic oil section and an amount of current distributed to each of the plurality of electromagnetic proportional control valves in the non-preferential hydraulic oil section. A target operational amount setting module provides a control target operational amount of an actuator for regulating a discharge rate of the variable displacement pump, based on the necessary oil flow rate calculated at the necessary flow rate calculating module, an output from a rotary sensor for detecting the rotational speed of the engine, and correlation data showing relationship between the discharge rate of the variable displacement pump and a rotational speed of an engine. |
