Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Reexamination Certificate
2008-05-13
2008-05-13
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
Reexamination Certificate
active
10543920
ABSTRACT:
A modification torque ΔT and a torque converter speed ratio e is computed from input and output revolution speeds of a torque converter31. A first determination coefficient α corresponding to the speed ratio e, and a second determination coefficient β corresponding to a pump pressure are computed. A selector87selects the smaller one of these coefficients as a determination coefficient γ, and the modification torque ΔT is multiplied by γ to provide a modification torque ΔTA. An adder89adds the modification torque ΔTA (negative value) to a pump base torque TR to provide a modified pump base torque TRA, whereby a maximum pump absorption torque TRA is controlled so as to become TRA. The maximum pump torque reducing control can then be performed while accurately confirming a work situation during the combined operation of travel and a working actuator.
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Hirata Toichi
Itoga Kentaro
Nakamura Kazunori
Nakamura Tsuyoshi
Sugiyama Genroku
Hitachi Construction Machinery Co. Ltd.
Lopez F. Daniel
Mattingly, Stanger Malur & Brundidge PC
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