US 10,865,692 B2Granted

Working machine and cooling control system for the same

AssigneeKubota Corporation

InventorsRyosuke Kinugawa, Nozomu Minagawa, Hiroshi Tatsumi, Keisuke Miura, Makoto Noguchi

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Abstract

A cooling control system for a working machine includes a fan, a housing to which the fan is attached, a prime mover having an output shall, a rotor to be rotated by a rotating power of the output shaft and to be rotated with the housing by a fluid introduced to a gap formed between the housing and the rotor, a fluid setting circuit to set an introduction amount of the fluid introduced to the gap, and a control device to control the fluid setting circuit to control the fan. The control device includes a setting circuit to set a target rotation speed of the fan based on a responsiveness of an actual rotation speed of the fan at time of changing of the target rotation speed of the fan.

Claims23

Dependent claims

A cooling control system for a working machine, comprising:

a fan;
a housing to which the fan is attached;
a prime mover having an output shaft;
a rotor to be rotated together with the housing by a rotating power of the output shaft through a fluid introduced to a gap formed between the housing and the rotor;
a fluid regulator to regulate an amount of the fluid introduced to the gap;
and
a controller configured to be controlled by a program to control the fluid regulator to regulate the actual rotation speed of the fan to be matched with a target rotation speed of the fan,
wherein the program causes the controller to,
calculate a target rotation speed (F1=E1 −D) of the fan by subtracting a predetermined speed (D) from an actual rotation speed (E1) of the prime mover
perform a proportional control for the actual rotation speed (F2) of the fan based upon a difference (=F1−F2) between the target rotation speed of the fan and the actual rotation speed of the fan,
perform an integral control for the actual rotation speed (F2) of the fan based upon the difference (=F1−F2),
perform a differential control for the actual rotation speed (F2) of the fan based upon the difference (=F1−F2), and
selectively deactivate one or two of the proportional control step, the integral control step, and the differential control step in accordance with the actual rotation speed of the prime mover.

10 more elements

A cooling control system for a working machine, comprising:

a prime mover having an output shaft;
a fan to be rotated by a rotating force of the output shaft;
a first detector to detect an actual rotation speed of the prime mover;
a second detector to detect an actual rotation speed of the fan;
and
a controller controlled by a program to:
perform a proportional control for the actual rotation speed of the fan based on of a difference between the actual rotation speed of the fan and a target rotation speed of the fan;
perform an integral control for the actual rotation speed of the fan based on the difference;
perform a differential control for the actual rotation speed of the fan based on the difference;
and
selectively deactivate one or two of the proportional control step, the integral control step, and the differential control step based on a state of either one of the prime mover and the fan.

8 more elements

A cooling control system for a working machine, comprising:

a fan;
a housing to which the fan is attached;
a prime mover having an output shaft;
a rotor to be rotated together with the housing by a rotating power of the output shaft through a fluid introduced to a gap formed between the housing and the rotor;
a fluid regulator to regulate an amount of the fluid introduced to the gap;
and
a controller configured to be controlled by a program to control the fluid regulator to regulate the actual rotation speed of the fan to be matched with a target rotation speed of the fan,
wherein the program causes the controller to,
calculate a target rotation speed of the fan by subtracting a predetermined speed from an actual rotation speed of the prime mover,
perform a proportional control for the actual rotation speed of the fan based upon a difference between the target rotation speed of the fan and the actual rotation speed of the fan,
perform an integral control for the actual rotation speed of the fan based upon the difference,
perform a differential control for the actual rotation speed of the fan based upon the difference, and
selectively deactivate one or two of the proportional control, the integral control, and differential control in accordance with the actual rotation speed of the prime mover.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/014,330Filed 21 Jun 2018 · continuation
Priority: 15 Dec 2016
Published: US 2018/0298805 A118 Oct 2018
Granted: 15 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F01P 5/04
Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers: pump-driving arrangements
F01P 7/042
By varying pump speed, e.g. by changing pump-drive gear ratio: using fluid couplings
F04D 27/004
Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids: by varying driving speed
F16D 35/028
With rotary working chambers and rotary reservoirs, e.g. in one coupling part: actuated electrically, e.g. by an electromagnet