Method for controlling gear ratio changes in an automatic transmission
First Claim
1. A non-transitory computer usable storage medium having computer readable program code thereon for controlling an automatic transmission of a machine, comprising:
- computer readable program code for identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio;
computer readable program code for determining an estimated power output value based on the proposed gear ratio and a current engine speed;
computer readable program code for adjusting the estimated power output value based on a derated operating condition;
computer readable program code for setting a gear evaluation identifier to a first value if the estimated power output value is greater than or equal to a current power output value; and
computer readable program code for setting the gear evaluation identifier to a second value if the estimated power output value is less than the current power output value.
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Accused Products
Abstract
A method of controlling an automatic transmission of a machine includes a step of identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio. An estimated power output value, based on the proposed gear ratio and a current engine speed, is determined. The estimated power output value is adjusted based on a derated operating condition. If the estimated power output value is greater than or equal to a current power output value, a gear evaluation identifier is set to a first value. If the estimated power output value is less than the current power output value, the gear evaluation identifier is set to a second value.
23 Citations
20 Claims
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1. A non-transitory computer usable storage medium having computer readable program code thereon for controlling an automatic transmission of a machine, comprising:
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computer readable program code for identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio; computer readable program code for determining an estimated power output value based on the proposed gear ratio and a current engine speed; computer readable program code for adjusting the estimated power output value based on a derated operating condition; computer readable program code for setting a gear evaluation identifier to a first value if the estimated power output value is greater than or equal to a current power output value; and computer readable program code for setting the gear evaluation identifier to a second value if the estimated power output value is less than the current power output value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A machine, comprising:
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an electronically controlled automatic transmission having at least two gear ratios; an internal combustion engine coupled to the electronically controlled automatic transmission; and at least one electronic controller in communication with the electronically controlled automatic transmission and the internal combustion engine, wherein the at least one electronic controller is configured to identify an upcoming gear ratio change from a current gear ratio to a proposed gear ratio;
determine an estimated power output value based on the proposed gear ratio and a current engine speed;
adjust the estimated power output value based on a derated operating condition;
change the current gear ratio to the proposed gear ratio if the estimated power output value is greater than or equal to a current power output value; and
maintain the current gear ratio if the estimated power output value is less than the current power output value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory computer usable storage medium having computer readable program code thereon for reducing an occurrence of a gear hunting event in an automatic transmission of a machine, comprising:
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computer readable program code for identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio based on a predetermined shift point; computer readable program code for determining an estimated power output value based on the proposed gear ratio and a current engine speed; computer readable program code for adjusting the estimated power output value based on a derated operating condition; computer readable program code for changing the current gear ratio to the proposed gear ratio if the estimated power output value is greater than or equal to a current power output value; and computer readable program code for adjusting the predetermined shift point if the estimated power output value is less than the current power output value. - View Dependent Claims (19, 20)
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Specification