Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1998-11-12
1999-12-07
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60449, 60491, F16D 3102
Patent
active
059963433
ABSTRACT:
In one aspect of the present invention, an apparatus for controlling the negative load of an engine is disclosed. The engine is drivingly connected to a hydro-mechanical drive system that includes a variable displacement pump and motor. An engine speed sensor senses the rotational speed of the engine and produces an actual engine speed signal indicative of the rotational engine speed. A travel speed sensor senses the travel speed of the machine and produces an actual travel speed signal indicative of the machine travel speed. An overspeed controller compares the actual engine speed signal to a proportional and integral threshold, produces a proportional and integral error signal indicative of the difference between the actual engine speed signal magnitude and the corresponding thresholds, calculates a proportional and integral control signal from the corresponding errors, combines the proportional and integral control signals and responsively produces a command signal. A displacement controller receives the command signal and responsively controls one of the variable pump and motor to regulate the negative engine load to optimize the retarding power of the engine without overspeeding the engine or drivetrain.
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Caterpillar Inc.
Masterson David M.
Nguyen Hoang
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