Method of controlling a transmission having a dual clutch system
First Claim
1. A method of controlling a transmission for a motor vehicle, the transmission having a dual clutch system, the transmission including:
- a first transmission input shaft including a plurality of drive gears mounted thereon;
a second transmission input shaft including a plurality of drive gears mounted thereon, the first and second transmission input shafts being concentric with one another;
a driven shaft having a plurality of gears mounted thereon in meshing engagement with the plurality of drive gears on the first and second transmission input shafts;
a first flywheel adapted to be mounted to an output shaft of an engine;
a first friction disk assembly mounted to the first transmission input shaft;
a first pressure plate adapted to be frictionally engaged with the first friction disk assembly and including a first linkage assembly for disengaging the first pressure plate from frictional engagement with the first friction disk assembly;
a second flywheel mounted to the first flywheel for rotation therewith;
a second friction disk assembly mounted to the second transmission input shaft;
a second pressure plate adapted to be frictionally engaged with the second friction disk, and assembly and including a second linkage assembly for disengaging the second pressure plate from frictional engagement with the second friction disk assembly;
the method comprising the steps of;
initiating a launch of the motor vehicle with the first pressure plate less than fully frictionally engaging the first friction disk assembly, and the second pressure plate less than fully frictionally engaging the second friction disk assembly; and
controlling one of the first linkage assembly and the second linkage assembly to disengage the corresponding one of the first pressure plate and the second pressure plate from frictional engagement with the corresponding one of the first friction disk assembly and the second friction disk assembly at a predetermined first clutch slip value based on a vehicle inertia value;
wherein the predetermined first clutch slip value is variable.
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0 Petitions
Accused Products
Abstract
A method of controlling a dual clutch transmission of a motor vehicle, wherein the first clutch acts to transmit torque to the first driven gear, and the second clutch acts to transmit torque to the second driven gear. The steps involved in controlling the transmission include determining a predetermined first clutch slip value based on the perceived vehicle loading, initiating launch of the motor vehicle with both the first and the second clutch partially engaged, determining the vehicle inertia value based on the summation of instantaneous vehicle inertia values during vehicle launch, and controlling either the first or the second clutch to disengage when the predetermined first clutch slip value is reached.
110 Citations
24 Claims
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1. A method of controlling a transmission for a motor vehicle, the transmission having a dual clutch system, the transmission including:
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a first transmission input shaft including a plurality of drive gears mounted thereon;
a second transmission input shaft including a plurality of drive gears mounted thereon, the first and second transmission input shafts being concentric with one another;
a driven shaft having a plurality of gears mounted thereon in meshing engagement with the plurality of drive gears on the first and second transmission input shafts;
a first flywheel adapted to be mounted to an output shaft of an engine;
a first friction disk assembly mounted to the first transmission input shaft;
a first pressure plate adapted to be frictionally engaged with the first friction disk assembly and including a first linkage assembly for disengaging the first pressure plate from frictional engagement with the first friction disk assembly;
a second flywheel mounted to the first flywheel for rotation therewith;
a second friction disk assembly mounted to the second transmission input shaft;
a second pressure plate adapted to be frictionally engaged with the second friction disk, and assembly and including a second linkage assembly for disengaging the second pressure plate from frictional engagement with the second friction disk assembly;
the method comprising the steps of;
initiating a launch of the motor vehicle with the first pressure plate less than fully frictionally engaging the first friction disk assembly, and the second pressure plate less than fully frictionally engaging the second friction disk assembly; and
controlling one of the first linkage assembly and the second linkage assembly to disengage the corresponding one of the first pressure plate and the second pressure plate from frictional engagement with the corresponding one of the first friction disk assembly and the second friction disk assembly at a predetermined first clutch slip value based on a vehicle inertia value;
wherein the predetermined first clutch slip value is variable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
repeatedly determining the difference between an instantaneous engine speed and the corresponding instantaneous vehicle speed until the predetermined first clutch slip value is reached; and
calculating the vehicle inertia value as a function of the continuous summation of the instantaneous speed differences.
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12. The method of controlling a transmission according to claim 1, wherein the first and the second friction disks each have an equivalent service life.
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13. A method of controlling a transmission of a motor vehicle, the motor vehicle having an engine having an engine flywheel, the transmission including a first clutch assembly for transferring torque from the engine flywheel to a first driven gear, and a second clutch assembly for transferring torque from the flywheel to a second driven gear, the method comprising the steps of:
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initiating a launch of the motor vehicle with the first clutch assembly less than fully coupling the flywheel to the first driven gear and the second clutch assembly less than fully coupling the flywheel to the second driven gear; and
controlling one of the first clutch assembly and the second clutch assembly to decouple the flywheel and one of the first driven gear and the second driven gear at a predetermined first clutch slip value based on an instantaneous vehicle inertia value;
wherein the predetermined first clutch slip value is variable. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
repeatedly determining the difference between an instantaneous engine speed and the corresponding instantaneous vehicle speed until the predetermined first clutch slip value is reached; and
calculating the vehicle inertia value as a function of the continuous summation of the instantaneous speed differences.
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24. The method of controlling a transmission according to claim 13, wherein the first and the second clutch assemblies each have an equivalent service life.
Specification