CONTROL METHOD FOR A DUAL CLUTCH TRANSMISSION

• Main Author: Faust, Hartmut
• Format: Patent
• Language: English; French; German
• Published: 25.04.2018
• Subjects: BLASTING; BRAKES; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

A method for controlling a drivetrain of a motor vehicle. The vehicle comprises a drive engine and a dual-clutch transmission. The dual-clutch transmission comprises a first friction clutch and a second friction clutch together with a first transmission unit and a second transmission unit, in order to establish a first power transmission branch and a second power transmission branch. The dual-clutch transmission comprising a clutch actuator device for actuating the friction clutches and a gearshift actuator device for engaging and disengaging gears of the dual-clutch transmission. The method assuming that the motor vehicle is being driven in a high original gear and comprising the following steps: derivation of a first shift signal from an actuation of a control element by the driver; calculation of a target gear, which is lower than the original gear and which corresponds to the first shift signal; selection of an intermediate gear between the original gear and the target gear, opening of the friction clutch corresponding to the original gear and closing of the friction clutch corresponding to the intermediate gear, in order to transmit drive power via the power transmission branch corresponding to the intermediate gear; and engagement of the target gear, opening of the friction clutch corresponding to the intermediate gear and closing of the friction clutch corresponding to the target gear in the event that a second shift signal is derived from an actuation of a control element by the driver.