Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Reexamination Certificate
2005-09-05
2010-10-12
Lazo, Thomas E (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
C060S449000, C060S486000
Reexamination Certificate
active
07810323
ABSTRACT:
A device for use in a work vehicle such as a wheel loader, capable of reliably preventing engine stall due to rapid application of high hydraulic load, without causing problems such as deterioration in fuel efficiency or vehicle performance and waste of energy. When determining that an engine speed detected by the engine speed detecting sensor has been decreased to the threshold value or lower, the controller implements a control to reduce the absorption torque of the variable displacement hydraulic pump. The hydraulic load is thus shifted to a low hydraulic load line. The change of the hydraulic load from the high hydraulic load to the low hydraulic load gives a margin to the current torque of the engine with respect to the low hydraulic load. Consequently, the actual speed of the engine is increased to return onto the regulation line, exceeding the threshold value.
REFERENCES:
patent: 4523892 (1985-06-01), Mitchell et al.
patent: 4606313 (1986-08-01), Izumi et al.
patent: 4663936 (1987-05-01), Morgan
patent: 4773369 (1988-09-01), Kobayashi et al.
patent: 5176504 (1993-01-01), Moriya et al.
patent: 5673557 (1997-10-01), Yoshida et al.
patent: 5967756 (1999-10-01), Devier et al.
patent: 6020651 (2000-02-01), Nakamura et al.
patent: 6170262 (2001-01-01), Yoshimura et al.
patent: 6176083 (2001-01-01), Ikari
patent: 6405844 (2002-06-01), Takamatsu
patent: A-56-159580 (1981-12-01), None
patent: U-61-55183 (1986-04-01), None
patent: A-06-221301 (1994-08-01), None
Refusing Reason Notice issued by the Japan Patent Office on Apr. 7, 2009 in the corresponding JP Patent Application No. 2004-258476 (and English Translation).
Komatsu Ltd.
Lazo Thomas E
Posz Law Group , PLC
LandOfFree
Load control device for engine of work vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Load control device for engine of work vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Load control device for engine of work vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4149754