Electronic control for a hydraulic system driving an auxiliary power
source is provided, with specific application as a system for controlling
the operation of a hydraulically driven AC generator. The system may
includes a hydraulic pump, a hydraulic motor drivably connected to the
generator, a fluid circuit for circulating fluid from the pump to the
motor and back. The fluid circuit may contain a bypass conduit to bypass
the motor. The system also includes a proportional servo control valve
assembly for controlling the fluid circuits and a control circuit for
controlling the proportional control valve assembly. The control system
can be capable of controlling the flow of hydraulic fluid to the motor
powering the electrical or mechanical system. Sensors for measuring the
operating parameters of the system and an operator interface module can
influence the operation of the system.