Method for controlling a twin-clutch transmission

• US 7,392,721 B2
• Filed: 01/13/2006
• Issued: 07/01/2008
• Est. Priority Date: 01/15/2005
• Status: Expired due to Fees

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Berger, Reinhard, Pollak, Burkhard
• Primary Examiner(s): Wright; Dirk
• Application Number:
  US11/332,428
• Publication Number:
  US 20060172855A1
• Time in Patent Office: 900 Days
• Field of Search: 743/40, 743/30, 743/39, 746/65.R, 743/29, 743/25, 743/31, 743/35, 477/72, 477/98, 477/94
• US Class Current: 74/330
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/1045 Friction clutch
• CPC Class Codes: F16D 2500/1085 Automatic transmission
• CPC Class Codes: F16D 2500/1086 Concentric shafts
• CPC Class Codes: F16D 2500/3111 Standing still, i.e. signal detecting when the vehicle is standing still or bellow a certain limit speed
• CPC Class Codes: F16D 2500/50206 Creep control
• CPC Class Codes: F16D 2500/50669 Neutral control, i.e. preventing creep or drag torque being transmitted in a transmission with a torque converter when the vehicle is stationary
• CPC Class Codes: F16D 2500/70464 Transmission parameters
• CPC Class Codes: F16D 2500/70488 Selection of the gear ratio
• CPC Class Codes: F16D 48/062 of a clutch system with a plurality of fluid actuated clutches
• CPC Class Codes: F16H 2061/0216 Calculation or estimation of post shift values for different gear ratios, e.g. by using engine performance tables
• CPC Class Codes: F16H 2312/04 Holding or hillholding
• CPC Class Codes: F16H 59/72 dependent on oil characteristics, e.g. temperature, viscosity
• CPC Class Codes: F16H 61/20 Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control
• 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 74/19228 Multiple concentric clutch shafts

Abstract

A method of controlling a twin-clutch transmission with a first partial transmission with which are associated a first engine clutch and a first group of gears, and a second partial transmission with which are associated a second engine clutch and a second group of gears, said method containing the step of engaging a forward gear associated with one partial transmission and a reverse gear associated with the other partial transmission when the transmission, with the motor vehicle at a standstill, is in a non-driving position.

Claims

1. A method of controlling a twin-clutch transmission with a first partial transmission with a first engine clutch and a first group of gears, and a second partial transmission with a second engine clutch and a second group of gears, comprising the steps of:

disengaging the first and second clutches;

acquiring a temperature signal;

engaging a forward gear from the first group of gears when a sensed temperature is under a predetermined temperature limit;

engaging a reverse gear from the second group of gears when the sensed temperature is under the predetermined temperature limit; and

, maintaining the engagement of the forward and reverse gears, while the first and second clutches are disengaged.

2. The method as defined in claim 1, wherein several reverse gears are present, the lowest one is used.

3. The method as defined in claim 2, wherein the lowest of the forward gears of the partial transmission that does not contain the reverse gear is used.

4. The method as defined in claim 1, wherein the temperature signal indicates the transmission oil temperature, the engine clutch temperature, the cooling water temperature or the ambient temperature or else a combination thereof.

5. The method as defined in claim 2, wherein the gears are engaged when in the presence of a parking brake system the parking brake is engaged.

6. The method as defined in one of claim 1, wherein after the engine of a motor vehicle has been started, the gears are engaged when the parking brake is engaged.