Working vehicle

Electricity: motive power systems – Battery-fed motor systems

Reexamination Certificate

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Details

C318S434000, C320S132000, C320S134000, C290S007000, C290S00400D

Reexamination Certificate

active

08030860

ABSTRACT:
A power shovel vehicle including a hydraulic pump that outputs hydraulic oil for operating a hydraulic actuator, an electric motor for driving the hydraulic pump, a main battery for supplying direct current electric power, an inverter for converting the direct current electric power into alternating current electric power and operating the electric motor, a second relay for making and breaking the connection between the main battery and the inverter, an operating device for operating the hydraulic actuator, a controller for controlling operation of the hydraulic actuator and inverter, and turning on and off the second relay, a first relay for making and breaking the connection between the main battery and the controller, a power source monitoring controller for monitoring conditions of the main battery and turning on and off the first relay, a hydraulic sensor for detecting the discharge pressure of the hydraulic pump, and an electric current sensor for measuring a load current flowing into the inverter.

REFERENCES:
patent: 6457351 (2002-10-01), Yamamoto
patent: 7100721 (2006-09-01), Atarashi et al.
patent: 2003/0097837 (2003-05-01), Hiraki et al.
patent: 2005/0234622 (2005-10-01), Pillar et al.
patent: 2005/0246082 (2005-11-01), Miki et al.
patent: 2006/0200292 (2006-09-01), Askage
patent: 2009/0025990 (2009-01-01), Futahashi et al.
patent: 2009/0261761 (2009-10-01), Yoshioka
patent: 2010/0075798 (2010-03-01), Suzuki et al.
patent: 1589211 (2005-10-01), None
patent: 09-046816 (1997-02-01), None
patent: 2004-225355 (2004-08-01), None
patent: 2004-251278 (2004-09-01), None
patent: 2004-300947 (2004-10-01), None
patent: 2004-067939 (2004-08-01), None
International Search Report for PCT/JP2007/061031 mailed on Sep. 4, 2007 (English Translation).

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