Gearshift control method for a motor vehicle

A method of gearshift control of a motor vehicle having a drive train comprising a drive engine, which is built as a turbo-charged internal combustion engine, a startup clutch and a shift clutch, which is built as an automated friction clutch, and a transmission which is built as an automatic stepped transmission, so as to avoid torque deficiencies of the drive engine occurring during a build-up of load at an end of a tractive upshift, the method comprising the steps of:

• accelerating the drive engine up to either a boost threshold speed (nL—min) or an engine speed (nM) slightly above the boost threshold speed (nL—min) after disengagement of a load gear, at the earliest, and at a start of the build-up of load after engagement of a target gear (nM=nL—min;
• nM=nL—min+ΔnM), at the latest;
• and
• loading the drive engine, during the build-up of load, at a substantially constant engine speed (nM≈nL—min) beyond an intake torque (MS) of the drive engine to nearly a full load torque (MVL(nL—min)) before ending a slipping operation of the friction clutch.

A method of controlling a gearshift in a drive train of a motor vehicle with which torque deficiencies of a turbo-charged internal combustion engine that occur, during a build-up of load at an end of a tractive upshift, are avoided, the drive train comprising the turbo-charged internal combustion engine, a startup clutch and a shift clutch built as an automated friction clutch and an automatic stepped transmission, the method comprising the steps of:

• disengagement of a load gear;
• accelerating the turbo-charged internal combustion engine up to at least a boost threshold speed (nL—min);
• engaging a target gear and starting a build-up of load of the turbo-charged internal combustion engine (nM=nL—min;
• nM=nL—min+ΔnM);
• loading the turbo-charged internal combustion engine at a substantially constant engine speed (nM≈nL—min) beyond an intake torque (MS) of the turbo-charged internal combustion engine to nearly a full load torque (MVL(nL—min));
• and
• fully engaging the friction clutch.