Automatic clutch
First Claim
Patent Images
1. An automatic clutch in a drive train of a motor vehicle having a transmission which is shifted manually between different drive positions or transmission stages, comprising:
- a motorized adjusting unit which actuates the clutch;
a system of sensors which monitors predetermined parameters and releases the clutch if criteria for a change of the transmission stage intended by the driver are detected;
wherein when the transmission stage has been selected, the clutch is controlled analogously with the torque of the engine with excess contact pressure such that a moment which can be transmitted by the clutch is a predetermined amount above the moment which can be picked up at the engine, and further wherein the amount of excess contact pressure is reduced at low outside temperatures.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an automatic clutch intended for an engine-transmission unit in a vehicle. When in the closing stage, the clutch works under contact overpressure conditions, so that the torque transmitted by the clutch is higher by a set quantity than the engine generated torque. At low external temperature, the contact overpressure is reduced, resulting in a shorter clutch adjustment path and in less energy being required for clutching, thereby compensating for the greater stiffness of the clutch control element.
-
Citations
4 Claims
-
1. An automatic clutch in a drive train of a motor vehicle having a transmission which is shifted manually between different drive positions or transmission stages, comprising:
-
a motorized adjusting unit which actuates the clutch; a system of sensors which monitors predetermined parameters and releases the clutch if criteria for a change of the transmission stage intended by the driver are detected; wherein when the transmission stage has been selected, the clutch is controlled analogously with the torque of the engine with excess contact pressure such that a moment which can be transmitted by the clutch is a predetermined amount above the moment which can be picked up at the engine, and further wherein the amount of excess contact pressure is reduced at low outside temperatures. - View Dependent Claims (2)
-
-
3. A control system for an automatic clutch in a drive train of a motor vehicle having a manually shiftable transmission and a motorized adjusting unit which actuates the clutch, comprising:
-
a control unit including a plurality of sensors which monitor predetermined parameters, the control units releasing the clutch if criteria indicating an intended transmission stage change by the driver are detected; wherein once the transmission stage is selected, the control unit controls the clutch analogously with an engine torque using excess contact pressure such that a moment which is transmittable by the clutch has a value which is a predetermined amount above a moment which is picked up at the engine, and further wherein the amount of excess contact pressure is reduced at low outside temperatures.
-
-
4. A method of controlling an automatic clutch in a drive train of a motor vehicle, the method comprising the acts of:
-
controlling the clutch when the transmission stage has been selected analogously with an engine torque with excess contact pressure, such that a moment which is transmittable by the clutch is a predetermined amount above a moment which can be picked up at the engine; and reducing the amount of excess contact pressure in accordance with lowered outside temperatures.
-
Specification