Dual clutch transmission clutch cooling control method
AssigneeBorgWarner Inc.
InventorsMark Buchanan, Melissa Koenig
Life of this patent
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Abstract
A method of controlling the temperature of the clutches of a dual clutch transmission, which includes the steps of providing a predetermined flow of cooling fluid to at least one clutch of the dual clutch transmission for controlling bulk clutch temperature, monitoring the temperature of the cooling fluid at the clutch, and changing the flow of the cooling fluid to the clutch as a function of a change in the bulk clutch temperature.
Claims20
A method of controlling the temperature of the clutches of a dual clutch transmission, said method including the steps of:
- providing a predetermined flow of cooling fluid to at least one clutch of the dual clutch transmission for controlling bulk clutch temperature;
- monitoring the temperature of the cooling fluid at the clutch;
- and
- changing the flow of the cooling fluid to the clutch as a function of a change in the bulk clutch temperature.
A method of controlling the temperature of the clutches of a dual clutch transmission, said method including the steps of:
- monitoring the input torque applied to the clutches;
- monitoring the slip across the clutches;
- determining the change in power transferred across the clutches when either the input torque or slip values change;
- and
- determining the change in the bulk clutch temperature of each clutch;
- determining the required change in the flow of cooling fluid to account for the change in the bulk clutch temperatures of each clutch;
- determining the available cooling fluid flow from the pump for the current engine speed;
- and
- proportioning the available cooling fluid flow to each of the clutches to account for the change in bulk clutch temperature of each clutch.
A method of controlling the temperature of the clutches of a dual clutch transmission, said method includes the steps of:
- monitoring the temperature of the cooling fluid leaving the clutches;
- monitoring the temperature of the cooling fluid in the sump of the transmission;
- monitoring the input torque applied to the clutches;
- monitoring the slip across the clutches;
- determining the change in power transferred across the clutches when either the input torque or slip values change;
- determining an initial change in the bulk clutch temperature for each clutch based on the change in power transferred each clutch;
- determining a secondary change in the bulk clutch temperatures based on the existing cooling fluid flow to each clutch prior to the change in power transferred;
- determining a total change in bulk clutch temperature for each clutch by summing the value of the initial change with the value of the secondary change in bulk clutch temperature;
- determining an initial required change in the flow of cooling fluid to each clutch to account for the total bulk clutch temperature;
- determining the difference between the temperature of the cooling fluid in the sump and the temperature of the cooling fluid leaving the clutches;
- determining an additional required change in the flow of cooling fluid for each clutch based on the temperature difference between the temperature of the cooling fluid in the sump and the temperature of the cooling fluid leaving the clutches;
- determining the total required change in the flow of cooling fluid for each clutch by summing the value of the initial required change with the value of the additional required change in the flow of cooling fluid;
- determining the available cooling fluid flow from the pump for the current engine speed;
- and
- proportioning the available cooling fluid flow to each of the clutches in relation to the total required change in the flow of cooling flow to account for the change in bulk clutch temperatures for each clutch.
Dependencies are inferred from the claim text.