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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) Application No.: 00064/KOL/2004 A
(22) Date of filing of Application: 17.02.2004 (43) Publication Date: 09/06/2006
(54) Title of the invention: METHOD OF CONTROLLING A DUAL CLUTCH TRANSMISSION
(51) International classification : F16D 67/00
(31) Priority Document No : 10/371,381;
10/634,239
(32) Priority Date : 21.02.2003; 5.8.03
(33) Name of priority country : USA
(86) International Application No and : NA
Filing Date
:
(87) International Publication No : NA
(61) Patent of addition to Application No : NA
Filed on : NA
(62) Divisional to Application No : NA
Filed on : NA
(57) Abstract:
A method of controlling the torque transferred across each
of the two clutches of a dual clutch transmission during a
two-gear positive downshift, wherein the first of the two
clutches drives an initial gear and the final gear and the
second of the two clutches drives an intermediate gear.
The method includes the steps of determining a clutch
torque and slip profile for the changeover of the clutches
and determining a target engine speed profile. The torque
transfer across each clutch is simultaneously controlled so
that the torque output of the transmission will be linearly
changed over from the first clutch to the second clutch to
cause the engine to track the target engine speed profile.
When the first clutch is slipping at a greater rate than the
second clutch the method changes over the gears driven
by the first clutch by disengaging the synchronizer of the
initial gear and engaging the synchronizer of the final gear
as the engine continues to tracks the target speed. The
torque transfer across each clutch is simultaneously
controlled so that the torque output of the transmission
will be linearly changed back from the second clutch to
the first clutch in an inversely proportional rate to
continue to cause the engine to track the target engine
speed profile.
(FIG.1)
(71) Name of Applicant:
BORGWARNER INC.
Address of the Applicant:
3800 AUTOMATION AVENUE, SUITE 100,
AUBURN HILLS, MICHIGAN 48326, UNITED
STATES OF AMERICA
(72) Name of the Inventor:
MARK BUCHANAN; MELISSA KOENIG
Filed U/S 5(2) before The Patents (Amendment)
Act, 2005: NO
The Patent Office Journal 09/06/2006 10949