Power machine or vehicle with power management
First Claim
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1. 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.
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Abstract
Power management control for a power machine or vehicle is disclosed. In illustrated embodiments, a user interface of the power machine or vehicle includes a power management selection for activating and deactivating power management control. In illustrated embodiments, power management control is implemented through a power management control component based upon feedback from an RPM sensor. As disclosed in illustrative embodiments, the power management control component utilizes control methods and characteristics stored in system memory to determine control input to adjust hydrostatic parameters for power management.
30 Citations
18 Claims
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1. A control assembly for a power machine having an engine comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A control assembly for controlling a drive pump in a hydrostatic drive system in a power machine having an engine that provides power to the hydrostatic drive system, comprising:
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an engine speed sensing device configured to provide engine speed feedback; a controller assembly configured to receive a commanded pump stroke or displacement input from a pump stoke or displacement input device and provide an output pump stroke or displacement to the drive pump; and a user interface 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; and wherein when the power management control mode is selected, the controller assembly determines whether a high demand condition exists by utilizing the feedback from the engine speed sensing device to sense a drop in engine speed such that when the high demand condition exists, the controller assembly reduces the output pump stroke or displacement below the commanded pump stroke or displacement and if the high demand condition does not exist, the controller assembly utilizes the commanded pump stroke or displacement to provide the output pump stroke or displacement without any reduction in response to the engine speed feedback; and wherein when the no power management mode is selected, the controller assembly utilizes the commanded pump stroke or displacement to provide the output pump stroke or displacement and the output pump stroke or displacement is not reduced below the commanded pump stroke or displacement. - View Dependent Claims (15, 16, 17, 18)
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Specification