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AssigneeZF Friedrichshafen AG
InventorsChristoph Pelchen, Detlef Baasch, Barbara Schmohl, Ünal Gazyakan
Estimating the term…
A method for controlling a drivetrain (1) in a motor vehicle is disclosed, in particular in an off-road vehicle with a drive unit (2), a multi-group transmission (4) and an output. The multi-group transmission (4) comprises at least an automatic gearbox (8) and a subsequent range transfer box (9) which may be switched by means of switching elements (24, 25). On changing the ratio in the range transfer box (9), a synchronisation of the switching element (24 or 25), for switching in the range transfer box (9), is carried out by means of a controller of switching elements in the automatic gearbox (8).
A method for controlling a drivetrain (1) in a vehicle, with a drive engine (2), a multi-range transmission (4) and a drive output, the multi-range transmission (4) consisting at least of an automatic transmission (8) and a downstream range transfer box (9) that can be shifted by means of shift elements (24, 25), when a transmission range of the range transfer box (9) is changed, a first shift element (24 or 25) of the range transfer box (9) that is to be engaged is synchronized by controlling shift elements (A to E) of the automatic transmission (8), such that the range change in the range transfer box can be, one of, carried out automatically or by generation of a voluntary drivers command at any vehicle speed;
A method for controlling a drivetrain (1) in a vehicle with a drive engine (2), a multi-range transmission (4) and a drive output, the multi-range transmission (4) consisting at least of an automatic transmission (8) and a downstream range transfer box (9), the method comprising the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or…:…
Determining of new ratio: determining the range
Shifting activities: changing the input torque to the transmission
Shifting activities: synchronising of new gear
Term ended 31 Mar 2024 (estimated)
This application is a national stage completion of PCT/EP2003/009104 filed Aug. 18. 2003 which claims priority from German Application Serial No. 102 38 127.5 filed Aug. 21. 2002.
The invention concerns a method for controlling the drivetrain in a vehicle.
From prior practice drivetrains of vehicles, in particular off-road vehicles, are known, which comprise a drive engine, a multi-range transmission and a drive output. The incorporation of a multi-range transmission enables several gear speeds to be made available with the fewest possible gear wheel pairings.
The invention will now be described, by way of example, with reference to the, accompanying drawings in which:
FIG. 1 is a schematic representation of a drivetrain with a drive engine, a starting element and a multi-range transmission consisting of an automatic transmission and a range transfer box;
FIG. 2 is a schematic representation of an automatic transmission selector lever, having an off-road position;
Referring to FIG. 1, a drivetrain 1 of a vehicle (of which no more is shown), in particular an off-road vehicle, is represented very schematically. In this case, the drivetrain 1 consists of a drive engine 2, a starting element 3 and a multi-range transmission 4. The drive engine 2 is an internal combustion engine whose drive torque m_mot is transferred via an output shaft 5 to the starting element 3 made with a hydrodynamic torque converter 6. In addition, the starting element 3 is formed with a converter clutch 7, with which the hydrodynamic torque converter can be bypassed.
The multi-range transmission 4 connected in series downstream from the starting element 3 is, in this case, formed by an automatic transmission 8 and a downstream range transfer box 9; the automatic transmission 8 constituting the main gear system of the multi-range transmission 4.
This gear combination of the present multi-range transmission 4 consists of the change-under-load automatic transmission 8 and a claw-actuated transmission group with a reduction step, namely, the automatically actuated range transfer box 9. This transmission combination is provided with an electronic control system consisting of an automatic transmission control unit, a range transfer box control unit and an engine control unit.