Method for controlling gear ratio changes in an automatic transmission
First Claim
1. A method of controlling an automatic transmission of a machine, comprising:
- identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio;
determining an estimated power output value based on the proposed gear ratio and a current engine speed;
adjusting the estimated power output value based on a derated operating condition;
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
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.
31 Citations
20 Claims
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1. A method of controlling an automatic transmission of a machine, comprising:
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identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio; determining an estimated power output value based on the proposed gear ratio and a current engine speed; adjusting the estimated power output value based on a derated operating condition; 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 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 method of reducing an occurrence of a gear hunting event in an automatic transmission of a machine, comprising:
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identifying an upcoming gear ratio change from a current gear ratio to a proposed gear ratio based on a predetermined shift point; determining an estimated power output value based on the proposed gear ratio and a current engine speed; adjusting the estimated power output value based on a derated operating condition; 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 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