Patent ID: 8718878

Claim:
A control assembly for a power machine having an engine comprising: a control mode input device including a power management selection to select a power management control mode and a no power management selection to select a no power management control mode; a user input device to input a commanded pump stroke or displacement for a hydrostatic drive assembly; and a controller assembly configured to receive the commanded pump stroke or displacement input from the user input device and to receive one of the power management selection and no power management selection from the control mode input device to provide one of the power management control mode or no power management control mode wherein in the power management control mode the controller assembly determines, based on feedback from an engine speed sensing device whether the engine is experiencing a high demand condition, wherein the high demand condition is indicated by a drop in engine speed, wherein when the high demand condition is indicated, the controller assembly provides an output pump stroke or displacement that is reduced below the output pump stroke or displacement for the commanded stroke or displacement responsive to the feedback from the engine speed sensing device to prevent stalling of the engine and when the high demand condition is not detected, the output pump stroke or displacement is not reduced below the output pump stroke or displacement for the commanded stroke or displacement responsive to the feedback from the engine speed sensor device; and in the no power management control mode, the controller assembly utilizes the commanded pump stroke or displacement from the user input device to provide the output pump stroke or displacement without utilizing the feedback from the engine speed sensing device, wherein the output pump stroke or displacement is not reduced below the output pump stroke or displacement for the commanded pump stroke or displacement.