Traveling hydraulic working machine

Details Traveling hydraulic working machine Traveling hydraulic working machine

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

07370475

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.

REFERENCES:
patent: 4523892 (1985-06-01), Mitchell et al.
patent: 5787787 (1998-08-01), Kim et al.
patent: 7225615 (2007-06-01), Bankestad et al.
patent: 9-317652 (1997-12-01), None
patent: 2968558 (1999-08-01), None
patent: 2000-73812 (2000-03-01), None

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