Method for Operating a Drive Unit for a Hybrid Vehicle

• US 20150375736A1
• Filed: 10/10/2013
• Published: 12/31/2015
• Est. Priority Date: 11/15/2012
• 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, GRIESMEIER, Uwe
• Granted Patent: US 10,099,684 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60K 2006/4816 Electric machine connected or connectable to gearbox internal shaft
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 10/113 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: F16H 2003/007 with two flow paths, one being directly connected to the input, the other being connected to the input though a clutch
• CPC Class Codes: F16H 2003/008 comprising means for selectively driving countershafts
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 3/725 with means to change ratio in the mechanical gearing
• CPC Class Codes: F16H 37/046 with an additional planetary gear train, e.g. creep gear, overdrive
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/91 Orbital, e.g. planetary gears
• CPC Class Codes: Y10S 903/914 : Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

Method for operating a drive unit for a hybrid vehicle, whereas the drive unit comprises a drive assembly (3) with an internal combustion engine (1) and an electric motor (2) and a transmission (5) featuring several sub-transmissions (6, 7) shifting between the drive assembly (3) and an output (4), whereas, through a planetary transmission (10), the electric motor (2) is coupled to an input shaft (8) of a first sub-transmission (6) and an input shaft (9) of a second sub-transmission (7) shifted in parallel to the first sub-transmission (6), whereas, through a frictional-locking separating clutch (11), the internal combustion engine (1) is able to be coupled to the input shaft (8) of the first sub-transmission (6) and, if the separating clutch (11) is locked, is coupled to the same element (15) of the planetary transmission (10) together with the input shaft (8) of the first sub-transmission (8), and whereas, for the coupling of the internal combustion engine (1) at the output (4) coming out of all-electric driving, the torque provided by the internal combustion engine (1) is transferred through the slip-controlled separating clutch (11), in order to, upon all-electric driving, unload the previously locked shift element and disengage it in the unloaded state.

Claims

1. Method for operating a drive unit for a hybrid vehicle, whereas the drive unit comprises a drive assembly (3) with an internal combustion engine (1) and an electric motor (2) and a transmission (5) featuring several sub-transmissions (6, 7) shifting between the drive assembly (3) and an output (4), whereas, through a planetary transmission (10), the electric motor (2) is coupled to an input shaft (8) of a first sub-transmission (6) and an input shaft (9) of a second sub-transmission (7) shifted in parallel to the first sub-transmission (6), whereas, through a frictional-locking separating clutch (11), the internal combustion engine (1) is able to be coupled to the input shaft (8) of the first sub-transmission (6) and, if the separating clutch (11) is locked, is coupled to the same element (15) of the planetary transmission (10) together with the input shaft (8) of the first sub-transmission (6), and whereas it is preferable that a positive-locking or frictional-locking optional bypass shift element (12) works together with the planetary transmission (10) in such a manner that, with a locked bypass shift element (12), a torque-proof connection between the electric motor (2) and the two input shafts (8, 9) of the two sub-transmissions (6, 7) and thus a mandatory equality of rotational speed between the same, exist, while, with an open bypass shift element (12), this torque-proof connection between the electric motor (2) and the two input shafts (8, 9) of the two sub-transmissions (6, 7), and thus the mandatory equality of rotational speed, do not exist, characterized in that, for the coupling of the internal combustion engine (1) at the output (4) coming out of all-electric driving, the torque provided by the internal combustion engine (1) is transferred through the slip-controlled separating clutch (11), in order to, upon all-electric driving, unload the previously locked shift element and disengage it in the unloaded state.

2-6. -6. (canceled)