US 2020/0347575 A1Published application

Drive system of construction machine

AssigneeKawasaki Jukogyo Kabushiki Kaisha

InventorsAkihiro KONDO, Takehisa KATO, Hideyasu MURAOKA

Life of this patent

Estimating the term…

Loading patent…

Abstract

A drive system of a construction machine includes: a controller that controls a fuel injection valve, so an actual rotation speed of an engine is adjusted to a setting rotation speed; a hydraulic circuit including a boom cylinder supplied with hydraulic oil from a pump driven by the engine, configured so energy is regenerated as motive power owing to the pump being driven by pressurized oil discharged from the boom cylinder at boom lowering; and a boom operation device including a boom operation lever. At boom lowering, the controller cuts a fuel supply to the engine when a cutting condition is satisfied, which is defined to include that an operating amount of the lever is less than or equal to a first threshold, and resumes the fuel supply when the cutting condition stops being satisfied or when the actual rotation speed of the engine becomes less than a second threshold.

Claims10

Dependent claims

A drive system of a construction machine, comprising:

a controller that controls a fuel injection valve provided on an engine, such that an actual rotation speed of the engine is adjusted to a setting rotation speed;
a hydraulic circuit that includes a pump and a boom cylinder, the pump being driven by the engine, the boom cylinder being supplied with hydraulic oil from the pump, the hydraulic circuit being configured such that energy is regenerated as motive power owing to the pump being driven by pressurized oil discharged from the boom cylinder at boom lowering;
and
a boom operation device including a boom operation lever, wherein
at boom lowering, the controller cuts a fuel supply to the engine when a cutting condition at boom lowering is satisfied, the cutting condition at boom lowering being defined to include that an operating amount of the boom operation lever is less than or equal to a first threshold, and resumes the fuel supply to the engine when the cutting condition at boom lowering stops being satisfied or when the actual rotation speed of the engine becomes less than a second threshold.

2 more elements

A drive system of a construction machine, comprising:

a controller that controls a fuel injection valve provided on an engine, such that an actual rotation speed of the engine is adjusted to a setting rotation speed;
a hydraulic circuit that includes a pump and a turning motor, the pump being driven by the engine, the turning motor being supplied with hydraulic oil from the pump, the hydraulic circuit being configured such that energy is regenerated as motive power owing to the pump being driven by pressurized oil discharged from the turning motor at turning deceleration;
and
a turning operation device including a turning operation lever, wherein
at turning deceleration, the controller cuts a fuel supply to the engine when a cutting condition at turning deceleration is satisfied, the cutting condition at turning deceleration being defined to include that an operating amount of the turning operation lever is less than or equal to a first threshold, and resumes the fuel supply to the engine when the cutting condition at turning deceleration stops being satisfied or when the actual rotation speed of the engine becomes less than a second threshold.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/765,135Filed 8 Nov 2018
Priority: JP 2017-22165917 Nov 2017
Published: 5 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

E02F 9/2217
Hydraulic or pneumatic drives: with energy recovery arrangements, e.g. using accumulators, flywheels
E02F 9/2292
Hydraulic circuits: systems with two or more pumps
E02F 3/32
With a dipper-arm pivoted on a cantilever beam , i.e. boom: working downwardly and towards the machine, e.g. with backhoes
E02F 9/123
Turntables, i.e. structure rotatable about 360°: drives or control devices specially adapted therefor

Family

US 10,900,199 B2Related patent
US 2020/0347575 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key