IP Library Granted Patent US 7,392,721
Granted Patent B2
US 7,392,721 · App. 11/332,428 · Granted Jul 1, 2008

Method for controlling a twin-clutch transmission

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Quick Facts
Patent No.
US 7,392,721
App. No.
11/332,428
Granted
Jul 1, 2008
Kind
B2
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 (10)

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.

Assignments (7)
CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258. Recorded Oct 11, 2016
From: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
To: SCHAEFFLER TECHNOLOGIES AG & CO. KG
Reel/Frame 040404/0530 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 5, 2016
From: LUK VERMÖGENSVERWALTUNGS GESELLSCHAFT MBH
To: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Reel/Frame 037731/0748 →
CHANGE OF NAME Recorded Feb 5, 2016
From: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
To: SCHAEFFLER TECHNOLOGIES AG & CO. KG
Reel/Frame 037731/0834 →
MERGER AND CHANGE OF NAME Recorded Feb 5, 2016
From: SCHAEFFLER TECHNOLOGIES AG & CO. KG; SCHAEFFLER VERWALTUNGS 5 GMBH
To: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Reel/Frame 037732/0228 →
CHANGE OF NAME Recorded Feb 5, 2016
From: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
To: SCHAEFFLER TECHNOLOGIES AG & CO. KG
Reel/Frame 037732/0347 →
MERGER Recorded Feb 3, 2016
From: LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KG
To: LUK VERMÖGENSVERWALTUNGS GESELLSCHAFT MBH
Reel/Frame 037740/0589 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 7, 2006
From: POLLAK, BURKHARD; BERGER, REINHARD
To: LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KG
Reel/Frame 017456/0761 →