Abstract: The invention relates to a correcting device for controlling the normal operating speed of an automotive engine with a variable speed transmission.The variable speed transmission incorporates a hydraulic control mechanism of which a movable member is connected to the actuating member of the speed reduction ratio control device, and is capable of being placed in communication selectively with a pressure fluid source and a reservoir through a distributing valve. A slide of the distributing valve is so connected that their actions oppose one another to a centrifugal governor and a resilient member connected to the acceleration control pedal of the vehicle through a pivotal lever. A movable part is connected to the speed reduction ratio control device and is disposed opposite the lever and serves as an abutment limiting the pivotal movement of the lever.