Energy based component wear model for clutch control offsets in an automatic transmission
AssigneeFca US LLC
InventorsDean Baker, Brian P Young, Nathan J Saliga
Life of this patent
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Abstract
An automatic transmission system of a vehicle and a corresponding adaptation method utilize an automatic transmission comprising a hydraulic friction clutch and a controller configured to continuously perform a feedforward adaptation procedure that models wear of the clutch, the feedforward adaptation procedure comprising obtaining a set of operating parameters each indicative of wear of the clutch, model the wear of the clutch based on the set of operating parameters using a clutch wear model, and determine a clutch offset for controlling application of the clutch based on the modeled clutch wear, and control application of the clutch based on the determined clutch offset.
Claims20
An automatic transmission system for a vehicle, the system comprising:
- an automatic transmission comprising a hydraulic friction clutch including a housing having therein a set of seals, a clutch disc defining first and second opposing sides each having frictional materials mounted thereon, a reaction plate parallel to a first side of the clutch disc, an apply plate parallel to the second side of the clutch disc, a clutch spring disposed between the reaction and apply plates, and a piston moveable in/out of a cavity defined by the housing in response to hydraulic fluid pressure sealed therein;
- and
- a controller configured to:
- continuously perform a feedforward adaptation procedure that models wear of the clutch, the feedforward adaptation procedure including:
- obtaining a set of operating parameters each indicative of wear of the clutch,
- modeling the wear of the clutch based on the set of operating parameters using a clutch wear model, wherein the modeled clutch wear comprises at least one of a modeled clutch seal wear, a modeled clutch frictional material wear, and a modeled clutch spring wear, and
- determining a clutch offset for controlling application of the clutch based on the modeled clutch wear;
- and
- control application of the clutch based on the determined clutch offset.
A continuous feedforward adaptation method for modeling wear of and for subsequently controlling application of a hydraulic friction clutch of an automatic transmission of a vehicle, the method comprising:
- obtaining, by a controller of the vehicle, a set of operating parameters each indicative of the wear of the clutch, the clutch including a housing having therein a set of seals, a clutch disc defining first and second opposing sides each having frictional materials mounted thereon, a reaction plate parallel to a first side of the clutch disc, an apply plate parallel to the second side of the clutch disc, a clutch spring disposed between the reaction and apply plates, and a piston moveable in/out of a cavity defined by the housing in response to hydraulic fluid pressure sealed therein;
- modeling, by the controller, the wear of the clutch using a clutch wear model and the set of operating parameters, wherein the modeled clutch wear comprises at least one of a modeled clutch seal wear, a modeled clutch frictional material wear, and a modeled clutch spring wear;
- determining, by the controller, a clutch offset for controlling application of the clutch based on the modeled clutch wear;
- and
- controlling, by the controller, application of the clutch based on the determined clutch offset.
Dependencies are inferred from the claim text.