Method for synchronizing the layshaft speed in the direct gear

• US 10,640,120 B2
• Filed: 10/05/2016
• Issued: 05/05/2020
• Est. Priority Date: 11/03/2015
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Kaltenbach, Johannes, Gluckler, Johannes, Renner, Stefan, Gersten, Rayk
• Primary Examiner(s): Holmes, Justin
• Application Number:
  US15/773,000
• Publication Number:
  US 20180354520A1
• Time in Patent Office: 1,308 Days
• Field of Search: None
• CPC Class Codes: B60K 2006/4816 Electric machine connected or connectable to gearbox internal shaft
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/111 with separate change-speed gear trains arranged in series
• CPC Class Codes: B60W 10/113 with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch
• CPC Class Codes: B60W 10/115 with planetary gears
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: F16H 2200/0069 the gear ratios comprising ten forward speeds
• CPC Class Codes: F16H 2200/0095 the gear ratios comprising four reverse speeds
• CPC Class Codes: F16H 2200/2005 with one sets of orbital gears
• CPC Class Codes: F16H 2306/48 Synchronising of new gear
• CPC Class Codes: F16H 3/006 : power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/091 : including a single countershaft
• CPC Class Codes: F16H 3/126 : using an electric drive
• CPC Class Codes: F16H 3/54 : one of the central gears being internally toothed and the other externally toothed
• CPC Class Codes: F16H 37/046 : with an additional planetary gear train, e.g. creep gear, overdrive
• CPC Class Codes: F16H 37/065 : with a plurality of driving or driven shafts F16H37/08 takes precedence
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles

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).

Claims

1. A method of synchronizing a countershaft speed in a direct gear for lowering the countershaft speed in a transmission for a hybrid application, which has a hybrid drive with an internal combustion engine and an electric machine, wherein the transmission comprises a main transmission comprising two parallel partial transmissions with at least one countershaft, an output shaft, and first and second planetary transmissions, each of the first and second planetary transmissions, comprises of a planetary carrier, a sun gear and a ring gear, each partial transmission has a respective transmission input shaft, a first transmission input shaft is designed as a hollow shaft and a second transmission input shaft is designed as a solid shaft, the first planetary transmission connects, as a range group, to the main transmission (HG), the main transmission comprises first, second, third, fourth and fifth gear planes and first, second, third and fourth shift elements, the method comprising:

performing, via a speed control of the electric machine, synchronization of the countershaft speed to a target speed in the direct gear.

2. The method of synchronizing the countershaft speed in the direct gear according to claim 1, further comprising using a tenth gear as the direct gear.

3. The method of synchronizing the countershaft speed in the direct gear according to claim 1, further comprising lowering the countershaft speed to zero.

4. The method of synchronizing the countershaft speed in the direct gear according to claim 1, wherein the first partial transmission has a plurality of gears ranging from a lowest gear to a highest gear and the method further comprising first engaging a shift element of the highest gear of the first partial transmission, unless the shift element is already engaged.

5. The method of synchronizing the countershaft speed in the direct gear according to claim 4, further comprising using the first shift element, in its second shifting position, as the shift element of the highest gear of the first partial transmission through which a fourth gear is obtained via the second gear plane.

6. The method of synchronizing the countershaft speed in the direct gear according to claim 1, further comprising shifting the third shift element to its second shifting position to obtain the direct gear.

7. The method of synchronizing the countershaft speed in the direct gear according to claim 1, further comprising, for a tenth gear with a preselected sixth gear, lowering the speed of the countershaft, and for the tenth gear with a preselected idling, and lowering the speed of the countershaft and the speed of the electric machine to zero.

8. The method of synchronizing the countershaft speed in the direct gear according to claim 1, further comprising using a shift element of a front-mounted group for synchronization, which is also engaged for a reverse drive.

9. The method of synchronizing the countershaft speed in the direct gear according to claim 8, further comprising using a single-acting seventh shift element, as the shift element of the front-mounted group, which is brought into its engaged shifting position and the first shift element is disengaged.

10. The method of synchronizing the countershaft speed in the direct gear according to claim 1, wherein there are two countershafts (VW) and the method further comprising lowering the countershaft speeds of the two countershafts (VW).