Control system and method for adaptive control of transmission fluid operating pressures
First Claim
1. A control system for a transmission, comprising:
- a pressure control module that;
determines a first learned pressure based on a first torque range of a predetermined steady-state of said transmission and a first transmission turbine speed of said predetermined stead-state, and a second learned pressure based on a second torque range of said predetermined stead-state and a second transmission turbine speed of said predetermined stead-state, andoperates a hydraulic control system of said transmission at a target pressure during said predetermined steady-state based on said first learned pressure and said second learned pressure; and
a pressure adapt module that selectively adjusts at least one of said first learned pressure and said second learned pressure based on a first pressure at which a slip condition of said transmission occurs.
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Accused Products
Abstract
A control system for a transmission includes a pressure control module and a pressure adapt module. The pressure control module operates a hydraulic control system of the transmission at a target pressure during steady-state operation of the transmission. The target pressure is based on first and second learned pressures for different predetermined first and second torque ranges. The pressure adapt module selectively adjusts at least one of the first learned pressure and the second learned pressure based on a first pressure at which a slip condition of the transmission occurs. The first and second learned pressures define a learned pressure gain and offset. When adjusting the first and second learned pressures, the pressure adapt module limits increases and decreases in the learned pressure gain offset based on a predetermined pressure gain and offset. A method is also provided.
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Citations
20 Claims
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1. A control system for a transmission, comprising:
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a pressure control module that; determines a first learned pressure based on a first torque range of a predetermined steady-state of said transmission and a first transmission turbine speed of said predetermined stead-state, and a second learned pressure based on a second torque range of said predetermined stead-state and a second transmission turbine speed of said predetermined stead-state, and operates a hydraulic control system of said transmission at a target pressure during said predetermined steady-state based on said first learned pressure and said second learned pressure; and a pressure adapt module that selectively adjusts at least one of said first learned pressure and said second learned pressure based on a first pressure at which a slip condition of said transmission occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a transmission, comprising:
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determining a first learned pressure based on a first torque range of a predetermined steady-state of said transmission and a first transmission turbine speed of said predetermined stead-state and a second learned pressure based on a second torque range of said predetermined stead-state and a second transmission turbine speed of said predetermined stead-state; operating a hydraulic control system of said transmission at a target pressure during said predetermined steady-state based on said first learned pressure and said second learned pressure; and selectively adjusting at least one of said first learned pressure and said second learned pressure based on a first pressure at which a slip condition of said transmission occurs. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification