Hydraulic circuit, method for operating the same
AssigneeAudi AG
InventorsDietmar Schuller, Hans-Peter Fleischmann, Stephan Herold
Life of this patent
Estimating the term…
Abstract
A dual clutch transmission, in particular of a motor vehicle, includes a hydraulic circuit for cooling the dual clutch transmission, wherein the hydraulic circuit includes at least one pump for conveying a hydraulic medium flow, at least one cooler for cooling the hydraulic medium flow, and a volume control valve for adjusting the hydraulic medium flow for at least one cooling system associated with clutches of the dual clutch transmission. The volume control valve is designed to convey the hydraulic medium flow in a first switching state to a first cooling system associated with a first of the clutches, and in at least one second switching state to a second cooling system associated with a second of the clutches.
Claims11
A dual clutch transmission comprising clutches and a hydraulic circuit for cooling the dual clutch transmission, wherein the hydraulic circuit comprises:
- a tank providing a hydraulic medium,
- at least one pump for conveying a hydraulic medium flow,
- at least one cooler for cooling the hydraulic medium flow,
- a volume control valve for adjusting the hydraulic medium flow for at least one cooling system associated with the clutches, wherein the volume control valve is constructed as a 4/3-way valve and conveys the hydraulic medium flow in a first switching position to a first cooling system associated with a first of the clutches, conveys the hydraulic medium flow in a second switching position to the tank, and conveys the hydraulic medium flow in a third switching position to a second cooling system associated with a second of the clutches, and
- a drive for the at least one pump adjusting a rotation speed of the pump for conveying the hydraulic medium to the volume control valve as a function of a desired cooling power.
A method for operating a dual clutch transmission with a hydraulic circuit for cooling the dual clutch transmission, comprising:
- conveying a hydraulic medium flow with a pump and cooling the hydraulic medium flow with a cooler, and
- adjusting the hydraulic medium flow for at least one cooling system associated with clutches of the dual clutch transmission with a volume control valve constructed as a 4/3-way valve,
- depending on an operating state of the dual clutch transmission, conveying the hydraulic medium flow with the volume control valve in at least a first switching position of the volume control valve to a first cooling system associated with a first of the clutches, conveying the hydraulic medium flow in a second switching position of the volume control valve to a tank providing hydraulic medium, and conveying the hydraulic medium flow in a third switching position to a second cooling system associated with a second of the clutches, and
- adjusting a rotation speed of the pump for conveying the hydraulic medium to the volume control valve as a function of a desired cooling power.
Dependencies are inferred from the claim text.