Hydraulic system with coordinated multiple axis control of a...

Data processing: generic control systems or specific application – Generic control system – apparatus or process – Digital positioning

Reexamination Certificate

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C700S061000, C700S069000, C700S071000, C700S189000, C700S251000, C701S050000

Reexamination Certificate

active

07856282

ABSTRACT:
A member of a machine, such as a boom on construction equipment for example, is pivoted by a first actuator and has a length that is alterable by a second actuator. A control method allows an operator of the machine to command a point on the member to move along a straight line path. The operator command specifies velocities along two orthogonal axes and those velocities are transformed into an angular velocity and a length velocity for the member. The angular velocity and a length velocity then are converted into individual velocities for the first and second actuators. Each actuator is operated at its respective velocity to achieve the commanded movement of the member.

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Keith Williams, “Coordinated Boom Control System for Rough Terrain Forklifts”, SAE Technical Papers Series, 1991, pp. 65-73, SAE International, Warrendale, Pennsylvania USA.

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