Actuator control device and work vehicle

Patent metadata

Field	Value
Publication number	US-10640334-B2
Application number	US-201515549981-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Feb 13, 2015
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

An actuator control device performs a reception process in which designations of a minimum operation amount and maximum operation amount of an operation unit for driving an actuator, and a maximum driving speed which is the actuator driving speed corresponding to the maximum operation amount are received. It also performs a determination process in which a function representing a characteristic line that links a first point, which corresponds to the minimum operation amount and the driving speed of 0, and a second point, which corresponds to the maximum operation amount and the maximum driving speed, is stored in a storage unit as a drive control characteristic and a drive control process in which, in response to operation of the operation unit, the actuator is driven at a driving speed corresponding to the operation amount specified by the drive control characteristic stored in the storage unit.

First claim

The invention claimed is:

1. An actuator control device comprising:
an actuator,
an input device configured to provide a continuously variable signal in response to an operator's operation of driving the actuator,
a memory device that stores a drive control characteristic which is represented by a characteristic line monotonically increasing on a two-dimensional plane defined by a first axis which represents the operation amount of the input device and a second axis which is orthogonal to the first axis and represents the driving speed of the actuator, the drive control characteristic representing the driving speed corresponding to the operation amount, and
a computer processor configured to drive the actuator based on the drive control characteristic stored in the memory device,
wherein the computer processor performs:
a first reception process in which inputs of values of a minimum operation amount and a maximum operation amount of the input device on the first axis for driving the actuator, and a value of a maximum driving speed on the second axis, which is the actuator driving speed corresponding to the maximum operation amount, are received,
a second reception process in which designations of the shape of the characteristic line are received,
a determination process in which the computer processor determines a function representing a characteristic line that links a first point, which corresponds to the minimum operation amount and the driving speed of 0, and a second point, which corresponds to the maximum operation amount and the maximum driving speed to form the designated shape, and stores the function in the memory device as the drive control characteristic,
a drive control process is performed in which, in response to operation of the input device, the actuator is driven at the driving speed corresponding to the operation amount specified by the drive control characteristic stored in the memory device, and
the characteristic line which is designated in the second reception process is limited to the group consisting of a single straight line and a curve which does not include an inflection point.

2. The actuator control device according to claim 1 ,
wherein the actuator is a hydraulic cylinder expanded and contracted by hydraulic oil supplied from a hydraulic pump, and
in the drive control process, the driving speed controlled by the computer processor is the flow rate per unit time of hydraulic oil passing through a switching valve disposed in an oil
passage extending from the hydraulic pump to the hydraulic cylinder.

3. A work vehicle comprising:
a lower traveling body,
an upper work body which operates supported by the lower traveling body, and
an actuator control device according to claim 1 for operating the upper work body.

Assignees

• Tadano Ltd

Inventors

• Kawabuchi Naoto
• Yoshida Naofumi
• Masuda Naotaka
• Fukumori Yasuhiro

Classifications

• F15B2211/75

  Control of speed of the output member · CPC title

• B66C13/56

  Arrangements of handles or pedals · CPC title

• F15B21/087

  Control strategy, e.g. with block diagram · CPC title

• F15B2211/327

  electrically or electronically · CPC title

• B66C13/20 Primary

  for non-electric drives (transmitting control pulses B66C13/40) · CPC title