US 8,285,434 B2Granted

Hybrid-type construction machine having an output condition calculating unit to calculate output conditions of an engine and an electric storage device

AssigneesSumitomo Heavy Industries, Ltd., Sumitomo(S.H.I.) Construction Machinery Co., Ltd.

InventorsMakoto Yanagisawa, Keiji Manabe

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Abstract

In the hybrid-type construction machine, the control unit (60) includes a drive distributing unit (60-8) and an output condition calculating unit (60-9). The output condition calculating unit (60-9) calculates output conditions inclusive of an output setting of the electric storage device determined from a state of charge of the electric storage device (58), an output setting of the engine determined from a number of revolutions of the engine (50), a hydraulic load required value indicative of drive power required by the oil pressure generating unit, and an electric load required value indicative of electric power required by the electric drive unit. The drive distributing unit (60-8) determines output values of the electric drive unit and the hydraulic drive unit based on the calculated output conditions.

Claims6

Dependent claims

A hybrid-type construction machine, comprising:

an oil pressure generating unit to convert an output of an engine into oil pressure for provision to a hydraulic drive unit;
a motor generator connected to the engine to serve as both an electric motor and a power generator;
an electric storage device to supply electric power to the motor generator to cause the motor generator to function as an electric motor;
an electric drive unit driven by electric power supplied from the electric storage device and to generate regenerative electric power for provision to the electric storage device;
and
a control unit to control an operation of the motor generator,
wherein the control unit includes:
an output condition calculating unit to calculate output conditions of the engine and the electric storage device;
and
a drive distributing unit to determine output values of the electric drive unit and the hydraulic drive unit based on the output conditions calculated by the output condition calculating unit.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/810,607Filed 26 Dec 2008
Priority: JP 2007-34083628 Dec 2007
Published: US 2010/0280697 A14 Nov 2010
Granted: 9 Oct 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

H02J 7/82
Including monitoring or indicating arrangements: control of state of charge [SOC]
B60W 10/08
Including control of propulsion units: including control of electric propulsion units, e.g. motors or generators
B60W 20/10
Control systems specially adapted for hybrid vehicles: controlling the power contribution of each of the prime movers to meet required power demand
E02F 9/123
Turntables, i.e. structure rotatable about 360°: drives or control devices specially adapted therefor