Regulating an actual pressure of a motor vehicle clutch
AssigneeGKN Automotive AG
InventorsAndreas Langhanki, Khac Anh Phan
Life of this patent
Estimating the term…
Abstract
Actual pressure of a hydraulic clutch of a motor vehicle can be regulated by: a) providing a value for a desired pressure to be present in a clutch cylinder; b) filling the clutch cylinder with hydraulic fluid to achieve the desired pressure; c) wherein, if the desired pressure lies between 0 and 7 bar, the actual pressure in the clutch cylinder is adjusted by regulating a rotational speed of the pump of the electric motor, and if the desired pressure is greater than 7 bar, the actual pressure in the clutch cylinder is adjusted by regulating a motor current of the electric motor; d) regulating the actual pressure until the desired pressure is achieved.
Claims6
A method for regulating an actual pressure of a clutch of a motor vehicle, the clutch having a plurality of clutch linings and a clutch spring, and being connected to a hydraulic pressure system that has at least one pump driven by an electric motor, a clutch cylinder and a clutch piston, the hydraulic pressure system being arranged for delivering a hydraulic fluid into the clutch cylinder via the pump and for moving the clutch piston, so that the clutch linings are brought into contact with one another counter to a force of the clutch spring, the method comprising:
- a) providing a value for a setpoint pressure which is to prevail in the clutch cylinder;
- b) filling the clutch cylinder with the hydraulic fluid in order to reach the setpoint pressure;
- c) determining that the setpoint pressure is one of less than or equal to 7 bar and greater than 7 bar, and, based on the determined set point pressure, selecting to set an actual pressure in the clutch cylinder by one of a regulation of rotational speed of the pump or the electric motor and a regulation of a motor current of the electric motor;
- and
- d) regulating the actual pressure until the setpoint pressure is reached.
A motor vehicle having a drive unit, a transmission and at least one clutch, the clutch having a plurality of clutch linings and a clutch spring, and being connected to a hydraulic pressure system which has at least one pump that is driven by way of an electric motor, a clutch cylinder and a clutch piston, the hydraulic pressure system being arranged for delivering a hydraulic fluid into the clutch cylinder via the pump and for moving the clutch piston, so that the clutch linings are brought into contact with one another counter to a force of the clutch spring, a controller being provided and configured for:
- a) providing a value for a setpoint pressure which is to prevail in the clutch cylinder;
- b) filling the clutch cylinder with the hydraulic fluid in order to reach the setpoint pressure;
- c) determining that the setpoint pressure is one of less than or equal to 7 bar and greater than 7 bar, and, based on the determined set point pressure, selecting to set an actual pressure in the clutch cylinder by one of a regulation of rotational speed of the pump or the electric motor and a regulation of a motor current of the electric motor;
- and
- d) regulating the actual pressure until the setpoint pressure is reached.
Dependencies are inferred from the claim text.