Title:
CONTROL DEVICE FOR CARGO HANDLING
Document Type and Number:
WIPO Patent Application WO/2013/176003
Kind Code:
A1
Abstract:
This control device is provided for use in industrial vehicles that are equipped with: a cargo loading platform; an actuator for driving the cargo loading platform; a hydraulic circuit that supplies hydraulic fluid to the actuator and that includes an electromagnetically operated multi-control valve in which the aperture is varied by changing the magnitude of a control current supplied to a solenoid; and an operation unit for receiving an operation to change the aperture of the electromagnetically operated multi-control valve and outputting a signal that indicates the operation amount. The control device at least performs: a control for determining the mean value of the magnitude of the control current corresponding to the aperture of a proportional valve that is the electromagnetically operated multi-control valve, said determination being based on the signal that indicates the operation amount and is output from an operation lever that is the operation unit; a control for determining, with the aperture of the proportional valve as a parameter, the magnitude of the dither current, which is an AC component, that should be added; and a control for outputting the control current to the proportional valve (42), the control current having the AC component of a magnitude determined by the control for determining the magnitude of the AC component using the magnitude determined by the mean value based on the aperture of the proportional valve.
Inventors:
IIZUMI HITOMI (JP)
AOKI YASUSI (JP)
KISHIDA TAKURO (JP)
AOKI YASUSI (JP)
KISHIDA TAKURO (JP)
Application Number:
PCT/JP2013/063456
Publication Date:
November 28, 2013
Filing Date:
May 14, 2013
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
F16K31/06; B66F9/22; B66F9/24; F15B13/043
Foreign References:
| JPH11171497A | 1999-06-29 | |||
| JPH04102777A | 1992-04-03 | |||
| JPH01229180A | 1989-09-12 |
Attorney, Agent or Firm:
AKAZAWA, Kazuhiro (JP)
Kazuhiro Akazawa (JP)
Kazuhiro Akazawa (JP)
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