Method for controlling a clutch unit
AssigneeMAGNA Powertrain AG & Co KG
InventorsMichael Kollmann, Jan Wiechmann
Life of this patent
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Abstract
A method for controlling a clutch unit for a drive train of a motor vehicle, wherein the clutch unit comprises a wet-running friction clutch for controllably transmitting torque from an input element to an output element of the clutch unit, wherein the clutch unit comprises oil for cooling the friction clutch, wherein heat inputs which contribute to heating the oil of the clutch unit are calculated, heat outflows which contribute to cooling the oil of the clutch unit are calculated and, as a function of the heat inputs and heat outflows, a maximum admissible clutch torque is calculated, and wherein the current clutch torque of the friction clutch is limited to the maximum admissible clutch torque.
Claims20
A method for controlling a clutch unit for a drive train of a motor vehicle, the method comprising:
- controllably transmitting a current clutch torque from an input element to an output element of a wet running friction clutch of the clutch unit, wherein the clutch unit includes oil for cooling the wet running friction clutch,
- calculating heat inputs that contribute to heating the oil of the clutch unit,
- calculating heat outflows that contribute to cooling the oil of the clutch unit and,
- calculating, as a function of the calculated heat inputs and heat outflows, a maximum admissible clutch torque, and
- limiting the current clutch torque of the wet running friction clutch to the maximum admissible clutch torque.
A method for controlling a clutch unit for a drive train of a motor vehicle, the method comprising:
- controlling a current clutch torque from an input element to an output element of a wet running friction clutch that includes oil for cooling the friction clutch, wherein the friction clutch is disposed in a drive train having an input element side and an output element side;
- receiving heating input variables corresponding to heat inputs that cause the oil to be heated in the friction clutch
- calculating the heat inputs from the heating input variables,
- receiving cooling input variables corresponding to heat outflows that cause the oil to be cooled in the friction clutch
- calculating the heat outflows from the cooling input variables,
- calculating, as a function of the calculated heat inputs and heat outflows, a limiting clutch torque, wherein the limiting clutch torque corresponds to a clutch torque where the oil of the friction clutch is not further heated when the limiting clutch torque is applied.
Dependencies are inferred from the claim text.