METHOD FOR SYNCHRONIZING THE LAYSHAFT SPEED IN THE DIRECT GEAR
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Abstract
A method of synchronizing the countershaft speed, in the direct gear, for a hybrid application. The transmission (1) comprises a main transmission (HG) comprising two parallel partial transmissions with at least one countershaft (VW), an output shaft (3), and two planetary transmissions (PG1, PG2) each comprising a carrier (ST1, ST2), sun gear (SR1, SR2) and ring gear (HR1, HR2). Each partial transmission has a transmission input shaft (4, 5), with a hollow first input shaft (4) and the solid second input shaft (5). The first planetary transmission (PG1) connects as a range group to the main transmission (HG). The main transmission (HG) comprises first (R1), second (R2), third (R3), fourth (R4) and fifth gear planes (R5) and first (S1), second (S2), third (S3) and fourth shift elements (S4). Synchronization of the countershaft speed to a target speed, in direct gear, is performed via speed control of the electric machine (2).
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Citations
20 Claims
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1-10. -10 (canceled)
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11. A method of synchronizing the countershaft speed in a direct gear for lowering the countershaft speed in a transmission (1) for a hybrid application, which has a hybrid drive with an internal combustion engine (21) and an electric machine (2), wherein the transmission (1) comprises a main transmission (HG) comprising two parallel partial transmissions with at least one countershaft (VW), an output shaft (3), and first and second planetary transmissions (PG1, PG2) which each comprises elements of a planetary carrier (ST1, ST2), a sun gear (SR1 , SR2) and ring gear (HR 1, HR2), each partial transmission has a transmission input shaft (4, 5), a first transmission input shaft (4) is designed as a hollow shaft and a second transmission input shaft (5) is designed as a solid shaft, the first planetary transmission (PG1) connects as a range group to the main transmission (HG), the main transmission (HG) comprises first (R1), second (R2), third (R3), fourth (R4) and fifth gear planes (R5) and first (S1), second (S2), third (S3) and fourth shift elements (54), the method comprising:
performing, via a speed control of the electric machine (2), synchronization of the countershaft speed to a target speed in the direct gear (G19). - View Dependent Claims (12, 13, 14, 15, 16, 17, 20)
- 18. The method of synchronizing the countershaft speed in the direct gear according to clairn 11, further comprising using a shift element of a front-mounted group (PG2) for synchronization, which is also engaged for a reverse drive.
Specification