Control system for prime mover and hydraulic pump of hydraulic c

Details Control system for prime mover and hydraulic pump of hydraulic c Control system for prime mover and hydraulic pump of hydraulic c

1998-10-06

1999-06-15

Novosad, Christopher J.

Excavating

Ditcher

Condition responsive

701 50, E02F 920

Patent

active

059115068

ABSTRACT:
A reference pump-delivery-rate calculating portion calculates a reference delivery rate of a hydraulic pump by referring to a table stored in a memory based on a control pilot pressure for the hydraulic pump. A target pump-delivery-rate calculating portion divides the reference delivery rate by a ratio of a maximum revolution speed to a target engine revolution speed, thereby calculating a target delivery rate. A target pump tilting calculating portion divides the target delivery rate by an actual engine revolution speed and a constant, thereby calculating a target tilting. A solenoid output current calculating portion calculates a drive current to provide the target tilting and outputs the drive current to a solenoid control valve. The pump delivery rate is thereby controlled with good response following input change of an operation instructing device.

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