Power management for a drive system
First Claim
1. A power machine having an engine that generates a torque output and a power conversion system configured to receive the torque output and provide a drive power signal in response to actuation signals for propelling the machine, comprising:
- an engine controller configured to provide an engine torque data signal indicative of a torque load on the engine;
a user input device configured to generate an input signal indicative of manipulation of the user input device by the user to command the machine to be propelled; and
an electronic controller in communication with the user input device, the power conversion system, and the engine controller and configured to receive the input signal and provide actuation signals to the power conversion system, wherein the electronic controller is further configured to provide the actuation signals as a function of the engine torque data signal to limit the engine torque load, and wherein the electronic controller is configured to reduce a displacement of a hydrostatic pump when the engine torque is above a given torque load even when the input signal from the user input device is indicative of a manipulation of the user input device to command an increase in the displacement of the hydrostatic pump.
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Accused Products
Abstract
A power machine having an engine that generates a torque output and a power conversion system configured to receive the torque output and provide a drive power signal in response to actuation signals for propelling the machine is disclosed. An engine controller provides an engine torque data signal indicative of a torque load on the engine. A user input device generates an input signal indicative of intention to propel the machine. An electronic controller is in communication with the user input device, the power conversion system, and the engine controller. The electronics controller receives the input signal and provides actuation signals to the power conversion system. The electronic controller further provides the actuation signals as a function of the engine torque data signal to limit the engine torque load.
31 Citations
18 Claims
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1. A power machine having an engine that generates a torque output and a power conversion system configured to receive the torque output and provide a drive power signal in response to actuation signals for propelling the machine, comprising:
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an engine controller configured to provide an engine torque data signal indicative of a torque load on the engine; a user input device configured to generate an input signal indicative of manipulation of the user input device by the user to command the machine to be propelled; and an electronic controller in communication with the user input device, the power conversion system, and the engine controller and configured to receive the input signal and provide actuation signals to the power conversion system, wherein the electronic controller is further configured to provide the actuation signals as a function of the engine torque data signal to limit the engine torque load, and wherein the electronic controller is configured to reduce a displacement of a hydrostatic pump when the engine torque is above a given torque load even when the input signal from the user input device is indicative of a manipulation of the user input device to command an increase in the displacement of the hydrostatic pump. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power management system for a power machine having an engine that generates a torque output and an engine controller configured to provide an engine torque data signal indicative of an engine torque load, the power management system comprising:
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a user input device configured to provide a user input in response to actuation by a user indicative of an intention to drive the machine over a support surface; a power conversion system including a hydrostatic pump that is coupled to the engine and receives the torque output; and an electronic controller coupled to the user input device, the power conversion system and engine controller and configured to receive the user input and to responsively provide actuation signals to the power conversion system to implement travel functions, wherein the electronic controller is configured to receive the engine torque data signal from the engine controller and to provide the actuation signals according to a torque limiting profile, and wherein the electronic controller determines which of a plurality of portions of the torque limiting profile to use, to constrain the actuation signals, based upon a comparison of the engine torque load to a plurality of set point torques. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of managing an engine torque load on a power machine, the method comprising:
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receiving an indication of the engine torque load; receiving an input from an operator input device; and providing actuation signals by an electronic controller, in response to the input from the operator input device, to a power conversion system coupled to the engine of the power machine and controlling engine torque load in response to the actuation signals, wherein the actuation signals are provided as a function of the engine torque load to implement a constraint on a rate of change of pump displacement of a hydrostatic pump according to a torque limiting profile. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification