System and method for controlling transmission based on variable pressure limit
First Claim
1. A system for controlling a transmission comprising a fluid pump and a fluid motor operably coupled to one another in a fluid circuit, the system comprising:
- a controller configured toreceive signals indicative of operator inputs from an operator interface device,determine a scale factor based on the signals indicative of operator inputs, and multiply the scale factor by a maximum fixed pressure limit to determine a modified maximum fixed pressure limit,determine an engine torque pressure limit based on a displacement associated with an engine torque limit,determine a variable pressure limit in the fluid circuit based on a lesser of the engine torque pressure limit and the modified maximum fixed pressure limit, andcontrol displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit.
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Accused Products
Abstract
A system for controlling a transmission including a fluid pump and a fluid motor operably coupled to one another in a fluid circuit is disclosed. The system includes a controller configured to receive signals indicative of operator inputs, and determine a variable pressure limit in the fluid circuit based on the signals indicative of operator inputs. The controller is further configured to control displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit.
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Citations
15 Claims
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1. A system for controlling a transmission comprising a fluid pump and a fluid motor operably coupled to one another in a fluid circuit, the system comprising:
a controller configured to receive signals indicative of operator inputs from an operator interface device, determine a scale factor based on the signals indicative of operator inputs, and multiply the scale factor by a maximum fixed pressure limit to determine a modified maximum fixed pressure limit, determine an engine torque pressure limit based on a displacement associated with an engine torque limit, determine a variable pressure limit in the fluid circuit based on a lesser of the engine torque pressure limit and the modified maximum fixed pressure limit, and control displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a transmission comprising a fluid pump and a fluid motor operably coupled to one another in a fluid circuit, the method including:
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receiving signals indicative of operator inputs from an operator interface device, determining a scale factor based on the signals indicative of operator inputs, and multiplying the scale factor by a maximum fixed pressure limit to determine a modified maximum fixed pressure limit, determining an engine torque pressure limit based on a displacement associated with an engine torque limit, and determining a variable pressure limit in the fluid circuit based on a lesser of the engine torque pressure limit and the modified maximum fixed pressure limit, controlling displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit. - View Dependent Claims (8, 9, 10)
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11. A machine comprising:
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a chassis; a prime mover coupled to the chassis; a transmission coupled to the prime mover, the transmission including; a fluid pump configured to provide a flow of fluid, a fluid motor configured to receive the flow of fluid from the fluid pump, and fluid lines providing a fluid circuit including the fluid pump and the fluid motor; traction devices coupled to the transmission, such that the traction devices are supplied with torque from the transmission; and a controller configured to receive signals indicative of operator inputs from an operator interface device, determine a scale factor based on the signals indicative of operator inputs, and multiply the scale factor by a maximum fixed pressure limit to determine a modified maximum fixed pressure limit, determine an engine torque pressure limit based on a displacement associated with an engine torque limit, determine the variable pressure limit based on a lesser of the engine torque pressure limit and the modified maximum fixed pressure limit, and control displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit. - View Dependent Claims (12, 13, 14, 15)
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Specification