Specifications

The Patent Office Journal 17/12/2010
4624
(12) PATENT APPLICATION PUBLICATION (21) Application No.3806/KOLNP/2010 A
(19) INDIA
(22) Date of filing of Application :11/10/2010 (43) Publication Date : 17/12/2010
(54) Title of the invention : HYDRAULIC SYSTEM INCLUDING FIXED DISPLACEMENT PUMP FOR DRIVING MULTIPLE
VARIABLE LOADS AND METHOD OF OPERATION
(51) International classification :F15B 11/16
(31) Priority Document No :61/044,337
(32) Priority Date :11/04/2008
(33) Name of priority country :U.S.A.
(86) International Application No
Filing Date
:PCT/US2009/040219
:10/04/2009
(87) International Publication No :WO 2009/126893
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
(62) Divisional to Application Number
Filing Date
:NA
:NA
(71)Name of Applicant :
1)EATON CORPORATION
Address of Applicant :EATON CENTER, 1111 SUPERIOR
AVENUE, CLEVELAND, OH 44114-2584, UNITED STATES
OF AMERICA.
(72)Name of Inventor :
1)WU,DUQIANG
2)BRENNER,PAUL
3)FORTUNE, CLARK,G.
4)JAGODA,AARON,H.
5)KESS,JOHN, RYAN
6)STOLTZ,THOMAS, J.
7)MORRIS, BENJAMIN
(57) Abstract :
An exemplary hydraulic system (10) includes a plurality of digital valves (40, 70, 86, 100) each valve fluidly connectable to a
corresponding hydraulic load (26,28,30). The digitals valves are operable to fluidly connect the corresponding hydraulic load to a
pressure source (12). The hydraulic system further includes a digital controller (114) operably connected to the plurality of digital
valves. The digital controller is configured to assign a priority level so that it is associated with each of a plurality of hydraulic loads,
and to formulate a pulse width modulated control signal based on the assigned priority levels. The digital controller transmits the
control signal to the plurality of digital valves for controlling the operation of the valves.
No. of Pages : 45 No. of Claims : 34