Fluid pump control device for wheel loaders

Details Fluid pump control device for wheel loaders Fluid pump control device for wheel loaders

2007-10-16

2007-10-16

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S430000, C060S444000

Reexamination Certificate

active

11320129

ABSTRACT:
A fluid pump control device for wheel loaders includes an engine for driving an axle through a transmission, a main pump, a variable-displacement steering pump with a pump regulator, an auxiliary pump, an electronic proportional control valve provided on a discharge quantity control signal line leading to the pump regulator for variably controlling a pilot pressure conveyed the pump regulator, a hydraulic load detector for detecting a real hydraulic load (Px), an engine revolution detector for detecting the number of revolution (N1) of the engine, a transmission revolution detector for detecting the number of output shaft revolution (N2) of the transmission. A controller is adapted to control the electronic proportional control valve and hence the fluid discharge quantity of the steering pump, based on the real hydraulic load (Px), the number of revolution (N1) of the engine and the number of output shaft revolution (N2) of the transmission.

REFERENCES:
patent: 4561250 (1985-12-01), Aoyagi et al.
patent: 6321535 (2001-11-01), Ikari et al.
patent: 6672055 (2004-01-01), Konishi et al.

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