The present invention relates to a hydraulic servo-motor for the control of an internal combustion engine with a servo-piston which is connected with a fuel quantity control mechanism of the internal combustion engine, with a control slide valve member coaxially arranged to the servo--piston which is operatively connected with the measuring mechanism of a centrifugal governor of the internal combustion engine, and with a working medium whose pressure is produced by a pump driven by the internal combustion engine. It is the aim of the present invention to enable a direct control without the reinforcing effect of the servo-motor during the starting of the engine, when the pressure of the working medium of the servo-motor is not yet present, or in case failure of this pressure as a result of a defect during the operation of the internal combustion engine, whereby a more unfavorable control behavior of the entire control circuit can be accepted. Control mechanisms are known in the art German Pat. In these prior art installations, the controller and the servo-motor are arranged separate from one another, and the connection between the centrifugal governor and the fuel quantity control mechanism takes place by way of a complicated linkage. Even though it is achieved thereby that the servo-piston need not be displaced during operation without pressure of the working medium by the adjusting forces of the centrifugal governor, the control system is unfavorably influenced also during the far more important and more frequently occurring operation with the servo-motor as regards its accuracy by the different levers with their idle strokes or lost motions and pivot points as well as by the necessary spring elements, because the linkages and the springs are arranged necessarily ahead of the servo-motor in the path of control flow. Furthermore, a control installation with a servo-motor for an internal combustion engine is known German Pat.
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