US 8,075,436 B2Granted

Hybrid drive train of a motor vehicle

AssigneeZF Friedrichshafen AG

InventorMax Bachmann

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Abstract

A hybrid gear train of a motor vehicle that has an internal combustion engine with a drive shaft, an electric motor with a rotor that operate as a motor and a generator, a transmission with two input shafts and an output shaft, as well as a differential transmission. At least one of the input shafts can be connected, via an assigned de-coupler, to the drive shaft, both of the input shafts can be connected by alternately assigned gearwheel sets of different ratios and in each case one assigned gear clutch to the output shaft. The differential transmission is designed as a simple planetary gearset that is coaxial with the first input shaft. The ring gear of this transmission is rotationally fixed to the one input shaft. The planet carrier is rotationally fixed to the second input shaft, and the sun gear is connected to and drives the rotor.

Claims27

Dependent claims

A hybrid drive train of a motor vehicle comprising:

an internal combustion engine (VM) with a driveshaft (4),
an electric motor (EM) with a rotor (6) that is operable as an engine and as a generator,
a multi-stage transmission (7) with first and second input shafts (GE1, GE2) and an output shaft (GA),
a differential transmission (8) in which at least one of the first and the second input shafts (GE1, GE2) is connected to the driveshaft (4) by an assigned decoupler (K), and both the first and the second input shafts (GE1, GE2) being selectively connected by alternately assigned gearwheel sets of different ratios and in each case one assigned gear clutch to the output shaft (GA),
the differential transmission (8) being a simple planetary gearset (9) is arranged coaxially about the first input shaft (GE1), a ring gear (H) being connected, in a rotationally fixed manner, to the first input shaft (GE1), a planet carrier (PT) being connected in a rotationally fixed manner to the second input shaft (GE2), and a sun gear (S) of the planetary gearset having a drive connection with the rotor (6), only the first input shaft (GE1) which is connected, in a rotationally fixed manner, with the ring gear (H) which is connectable, by a decoupler (K), to the driveshaft (4), and
the multi-stage transmission (7) being a countershaft transmission with a coaxially adjacent arrangement of the output shaft (GA), and first and second countershafts (VG1, VG2) which have, in each case, a drive connection with one of the first and the second input shafts (GE1, GE2) by an input constant (EK1, EK2), the gearwheel sets of which are respectively arranged alternately on the first countershaft (VG1) and on the output shaft (GA), and the second countershaft (VG2) and the output shaft (GA).

3 more elements

A method of controlling a hybrid drive train of a motor vehicle which comprises an internal combustion engine (VM) with a driveshaft (4), an electric motor (EM) with a rotor (6) that is operable as an engine and as a generator, a multi-stage transmission (7) with first and second input shafts (GE1, GE2) and an output shaft (GA), a differential transmission (8), in which at least one of the first and the second input shafts (GE1, GE2) is connected to the driveshaft (4) by an assigned decoupler (K), both of the first and the second input shafts (GE1, GE2) is connected selectively by alternately assigned gearwheel sets of different ratios and in each case one assigned gear clutch to the output shaft (GA), and in which the differential transmission (8) is a simple planetary gearset (9) that is arranged coaxially about the first input shaft (GE1), a ring gear (H) of which is connected in a rotationally fixed manner to the first input shaft (GE1), a planet carrier (PT) of which is connected in a rotationally fixed manner to the second input shaft (GE2), and a sun gear (S) of this planetary gearset has a drive connection with the rotor (6), only the first input shaft (GE1), which is connected in a rotationally fixed manner with the ring gear (H) is connectable to the driveshaft (4) by means of a decoupler (K), and the multi-stage transmission (7) is a countershaft transmission with a coaxially adjacent arrangement of the output shaft (GA), and first and second countershafts (VG1, VG2) which have, in each case, a drive connection with one of the first and the second input shafts (GE1, GE2) by an input constant (EK1, EK2), the gearwheel sets of which are respectively arranged alternately on the first countershaft (VG1) and on the output shaft (GA), the second countershaft (VG2) and the output shaft (GA), the method comprising the steps of:

disengaging the decoupler (K),
engaging a gear clutch of a gear assigned to the first input shaft (GE1) and a gear clutch of a gear assigned to the second input shaft (GE2), and
then accelerating the rotor (6) of the electric motor (EM) during motor operation to start driving with the electric motor.

Dependencies are inferred from the claim text.

Facts

Application: 12/519,372Filed 3 Dec 2007
Priority: DE 10 2006 059 59116 Dec 2006
Published: US 2010/0009805 A114 Jan 2010
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

B60W 20/00
Control systems specially adapted for hybrid vehicles
B60K 6/00
Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion
B60K 6/365
Characterised by the transmission gearings: with the gears having orbital motion
B60K 6/48
Characterised by the architecture of the hybrid electric vehicle: parallel type