Transmission component failure detection and avoidance
First Claim
1. A method of operating a transmission comprising:
- during a shift event, measuring a gearbox output torque, estimating a gearbox input torque using a first model, and estimating a torque of a component based on the output torque measurement and the input torque estimate using a second model; and
in response to the estimated torque of the component being outside an expected range, setting an error flag readable by service personnel.
1 Assignment
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Accused Products
Abstract
A method of operating a transmission includes measuring an output torque, estimating a gearbox input torque using a model, and estimating gearbox component torques based on a detailed gearbox model. The model used to estimate the input torque varies depending on whether a torque converter is locked, open, or slipping. In some operating conditions, multiple estimates are available for gearbox input torque, impeller torque, or shift element torque in which case the models are adapted. When an estimated component torque is outside an expected range, a warning flag is raised and diagnostic data is saved. When an estimated torque approaches or exceeds a torque limit, the input torque command may be reduced to prevent component damage. A warning flag may also be raised and diagnostic data saved in response to a model parameter being adapted to a value outside of a predetermined range.
9 Citations
23 Claims
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1. A method of operating a transmission comprising:
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during a shift event, measuring a gearbox output torque, estimating a gearbox input torque using a first model, and estimating a torque of a component based on the output torque measurement and the input torque estimate using a second model; and in response to the estimated torque of the component being outside an expected range, setting an error flag readable by service personnel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a transmission comprising:
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while operating with a fixed gearbox ratio, calculating first and second estimates of a transmission component torque using first and second models respectively; in response to the first estimate differing from the second estimate, adapting a parameter of the first model; and in response to the parameter being outside a predetermined range, setting an error flag readable by service personnel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of operating a transmission comprising:
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between shift events, adapting an aggregate gearbox loss model using first values of an output torque and of a gearbox input torque; during shift events, estimating gearbox component torques using second values of the output torque and the gearbox input torque and a detailed gearbox model based on torque relationships for gears and shift elements; and adapting the detailed gearbox model using the aggregate gearbox loss model. - View Dependent Claims (21, 22, 23)
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Specification