Transmission configuration and method for controlling a transmission

• US 20080153666A1
• Filed: 03/06/2008
• Published: 06/26/2008
• Est. Priority Date: 09/24/2004
• Status: Active Grant

• Current Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG, Volkswagen AG
• Original Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG, Volkswagen AG
• Inventors: Fahland, Jorg, Damm, Ansgar, Cappelmann, Bernd, Ruhle, Gunter, Herdle, Lothar, Beck, Matthias, Seufert, Martin, Glatthaar, Josef, Hofmann, Rainer
• Granted Patent: US 7,624,658 B2
• Time in Patent Office: Days
• US Class Current: 477/107
• CPC Class Codes: F16H 2200/0056 the gear ratios comprising seven forward speeds
• CPC Class Codes: F16H 2312/02 Driving off
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 59/38 of gearing elements
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts
• CPC Class Codes: Y10T 74/19251 Control mechanism
• CPC Class Codes: Y10T 74/19288 Double clutch and interposed transmission

Abstract

A transmission configuration includes an automated dual-clutch transmission having two transmission sections with respective input shafts, respective output shafts and respective motor clutches. The motor clutches are connected, on a motor side thereof, to a drive shaft and to a respective one of the input shafts on a transmission side thereof. A drive-side speed sensor unit is disposed at the drive shaft. An input-side speed sensor configuration includes sensor wheels connected, fixed against relative rotation, to respective ones of the input shafts, and pulse sensors disposed stationary with respect to a housing and within an effective range of the respective sensor wheels. The input-side speed sensor configuration is configured to detect a speed of the input shafts and a direction of rotation of at least one of the input shafts. A method for controlling an automated dual-clutch transmission is also provided.

Claims

1. A method for controlling a transmission, the method which comprises:

providing an automated dual-clutch transmission with two transmission sections, each having a motor clutch connected on a motor side thereof, via a drive shaft, to a drive motor, an input shaft connected to the motor clutch on a transmission side thereof, and gear wheel sets forming a group of gear stages and each including a fixed gear and an idler gear, wherein a connection with a gear ratio between the input shaft and an output shaft can be established with the gear stages by in each case engaging a gear clutch assigned to the idler gear, wherein the output shaft forms a power take-off shaft connected to an axle drive or wherein the output shaft is permanently connected to such a power take-off shaft, and with a sensor configuration with at least a drive-side speed sensor unit disposed at the drive shaft, and an input-side speed sensor unit disposed at the input shaft of one of the two transmission sections; and

determining a speed of the input shaft of one transmission section by using an input-side speed sensor unit of another transmission section, by first, with a respective engaged gear stage in both transmission sections, ascertaining, with the input-side speed sensor unit, a speed of the input shaft of the other transmission section and by subsequently calculating the speed of the input shaft of the one transmission section from the ascertained speed with the gear ratios of both engaged gear stages.

2. The method according to claim 1, which comprises determining a direction of rotation of the input shaft of the one transmission section with the input-side speed sensor unit of the other transmission section, that is configured to be sensitive to a direction of rotation, by first, with a respective engaged gear stage in both transmission sections, ascertaining, with the input-side speed sensor unit, a direction of rotation of the input shaft of the other transmission section and by subsequently calculating the direction of rotation of the input shaft of the one transmission section from the direction of rotation with changes in a direction of rotation of the gearwheel sets of both engaged gear stages.

3. The method according to claim 1, which comprises, in case of a shift process between a load gear stage assigned to the other transmission section and a target gear stage assigned to the one transmission section, leaving the load gear stage engaged until a motor clutch assigned to the target gear stage is completely closed for determining at least one of a speed and a direction of rotation of the input shaft of the one transmission section by using the input-side speed sensor unit of the other transmission section.

4. The method according to claim 1, which comprises, in case of a driving-off process with a driving-off gear stage of the one transmission section, engaging a gear stage in the other transmission section as an auxiliary gear stage for determining at least one of a speed and a direction of rotation of the respective input shaft by using the input-side speed sensor unit of the other transmission section.

5. The method according to claim 4, which comprises engaging, as an auxiliary gear stage in the other transmission section, a with respect to the driving-off gear stage of the one transmission section next higher gear stage.

6. A transmission configuration, comprising:

a drive shaft configured to be connected to a motor;

an automated dual-clutch transmission including a housing and two transmission sections with respective input shafts, respective output shafts and respective motor clutches, said motor clutches having a motor side and a transmission side, and said motor clutches being connected to said drive shaft on the motor side of said motor clutches and being connected to a respective one of said input shafts on the transmission side of said motor clutches;

an axle drive;

each of said transmission sections including gearwheel sets, said gearwheel sets forming a respective group of gear stages and having respective fixed gears and respective idler gears;

each of said transmission sections including gear clutches assigned to said idler gears such that, when a given one of said gear clutches assigned to a given one of said idler gears is engaged, a respective one of said input shafts is connected to a respective one of said output shafts with a given gear ratio, and said respective one of said output shafts is operatively connected to said axle drive;

a drive-side speed sensor unit disposed at said drive shaft; and

an input-side speed sensor configuration including a first sensor wheel connected, fixed against relative rotation, to a first one of said input shafts, a second sensor wheel connected, fixed against relative rotation, to a second one of said input shafts, a first pulse sensor disposed stationary with respect to said housing and within an effective range of said first sensor wheel, and a second pulse sensor disposed stationary with respect to said housing and within an effective range of said second sensor wheel, said input-side speed sensor configuration being configured to detect a speed of said input shafts and a direction of rotation of at least one of said input shafts, said drive-side speed sensor unit and said input-side speed sensor configuration forming a sensor configuration for controlling said automated dual-clutch transmission.

7. The transmission configuration according to claim 6, wherein said first sensor wheel and said first pulse sensor form a first input-side speed sensor unit, said first input-side speed sensor unit is sensitive to speed and sensitive to a direction of rotation, said second sensor wheel and said second pulse sensor form a second input-side speed sensor unit.

8. The transmission configuration according to claim 6, including a power take-off shaft connected to said axle drive, said respective one of said output shafts being operatively connected to said axle drive by being permanently connected to said power take-off shaft.

9. The transmission configuration according to claim 6, wherein said respective one of said output shafts which is operatively connected to said axle drive forms a power take-off shaft connected to said axle drive.

10. The transmission configuration according to claim 6, wherein said first sensor wheel is a rotary-direction encoded sensor wheel and said first pulse sensor is a simple pulse sensor.

11. The transmission configuration according to claim 6, wherein:

said drive-side speed sensor unit disposed at said drive shaft includes a pulse sensor; and

said first pulse sensor, said second pulse sensor, and said pulse sensor of said drive-side speed sensor unit are combined in a pre-assembled module in order to be installed together.

12. A method for controlling a transmission, the method which comprises:

providing an automated dual-clutch transmission with two transmission sections, each having a motor clutch connected on a motor side thereof, via a drive shaft, to a drive motor, an input shaft connected to the motor clutch on a transmission side thereof, and gear wheel sets forming a group of gear stages and each including a fixed gear and an idler gear, wherein a connection with a gear ratio between the input shaft and an output shaft can be established with the gear stages by in each case engaging a gear clutch assigned to the idler gear, wherein the output shaft forms a power take-off shaft connected to an axle drive or wherein the output shaft is permanently connected to such a power take-off shaft, and with a sensor configuration with at least a drive-side speed sensor unit disposed at the drive shaft, a first input-side speed sensor unit disposed at the input shaft of a first one of the transmission sections, and a second input-side speed sensor unit disposed at the input shaft of the second one of the transmission sections; and

determining, in case of an external synchronization of the gear stages in a shift process between a load gear stage assigned to the first one of the transmission sections and a target gear stage assigned to the second one of the transmission sections, an output-side speed of the gear clutch of the target gear stage with the first input-side speed sensor unit of the first one of the transmission sections, by first ascertaining, with the first input-side speed sensor unit, a speed of the input shaft of the first one of the transmission sections and by subsequently calculating from the ascertained speed with an effective transmission ratio between the respective input shaft and the gear clutch of the target gear stage, an output-side speed of the gear clutch of the target gear stage.