US 7,745,947 B2Granted

Hybrid working machine

AssigneeKobelco Construction Machinery Co., Ltd.

InventorsMasayuki Komiyama, Masayuki Kagoshima

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Abstract

The present invention is to drive a hydraulic pump and a generator motor by an engine, to electrically charge a battery by a generator action of the generator motor, and to drive the generator motor by electric power of the battery so as to assist the engine. A governor position is changed by operations of a potentiometer for accelerator and a mode selection switch so as to control rotation speed of the engine. On the premise of the above configuration, generator output is limited by a controller at the time of accelerating the engine until the rotation speed of the engine reaches set speed determined on the basis of the operations of the potentiometer for accelerator and the mode selection switch, and hence engine load is reduced so as to assist acceleration.

Claims8

Dependent claims

A hybrid working machine, comprising:

a hydraulic pump for driving a hydraulic actuator;
a generator motor for performing a generator action and a motor action;
an engine serving as a common power source for said hydraulic pump and said generator motor;
an electric storage device electrically charged by the generator action of said generator motor, the electric storage device being configured such that said generator motor is driven by electric power of the electric storage device so as to perform the motor action;
accelerator operating means for changing a fuel injection amount so as to control rotation speed of said engine;
and
generator output controlling means for controlling generator output of said generator motor, wherein
said generator output controlling means for limiting the generator output in a process of accelerating the rotation speed of said engine to set speed determined on the basis of the operation of said accelerator operating means.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/875,340Filed 19 Oct 2007
Priority: JP 2006-28684220 Oct 2006
Published: US 2008/0093865 A124 Apr 2008
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification31 codes

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
B60K 6/48
Characterised by the architecture of the hybrid electric vehicle: parallel type
B60K 6/543
Transmission for changing ratio: the transmission being a continuously variable transmission
B60L 1/003
Supplying electric power to auxiliary equipment of vehicles: to auxiliary motors, e.g. for pumps, compressors

Family

US 2008/0093865 A1Pre-grant publication · published 24 Apr 2008
US 7,745,947 B2This patent

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

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