Device for a drivetrain of a hybrid vehicle, drivetrain and method for operating the same

Patent metadata

Field	Value
Publication number	US-9409473-B2
Application number	US-201213654459-A
Country	US
Kind code	B2
Filing date	Oct 18, 2012
Priority date	Oct 26, 2011
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A device for a drive train of a hybrid vehicle having a planetary gear set which comprises a carrier element, a sun gear element, and a ring gear element. A first element connects to a first input shaft of a first subtransmission of a transmission, and a second element connects to an electric machine of a hybrid drive. A first shift element which couples, in a first shift position, a third of the elements to a second input shaft of a second subtransmission of the transmission, to which an internal combustion engine can be coupled, and, in a second shift position, can be coupled to another element of the planetary gear set, and having a second shift element which couples the input shafts of both subtransmissions when engaged and separates the input shafts of both subtransmissions when disengaged.

First claim

The invention claimed is:

1. A device, for a drive train of a hybrid vehicle, comprising:
a planetary gear set ( 8 ) comprising a carrier ( 9 ), a sun gear ( 10 ) and a ring gear ( 11 ), a first element ( 9 , 10 or 11 ) of the planetary gear set serving for establishing a fixed connection to a first transmission input shaft ( 6 ) of a first subtransmission ( 4 ) of a transmission, and a second element ( 9 , 10 or 11 ) of the planetary gear set serving for establishing a fixed connection to an electric machine ( 2 ) of a hybrid drive,
a third element ( 9 , 10 or 11 ) of the planetary gear set being connectable, via a first shift position (A) of a first shift element ( 12 ), to a second transmission input shaft ( 7 ) of a second subtransmission ( 5 ) of the transmission to which further an internal combustion engine ( 1 ) of the hybrid drive being connectable,
the third element ( 9 , 10 or 11 ) being connectable, via a second shift position (B) of the first shift element ( 12 ), to another of the second and the third elements ( 9 , 10 or 11 ) of the planetary gear set,
a second shift element ( 13 ), and
when the second shift element ( 13 ) is engaged, both the first and the second transmission input shafts ( 6 , 7 ) of the first and the second subtransmissions ( 4 , 5 ) being coupled together, and when the second shift element ( 13 ) is disengaged, both of the first and the second transmission input shafts ( 6 , 7 ) of the first and the second subtransmissions ( 4 , 5 ) being separated from one another.

2. The device according to claim 1 , wherein the planetary gear set ( 8 ), in the first shift position (A) of the first shift element ( 12 ) in a first operating mode, serves as a superposition transmission, and
in the second shift position (B) in a second operating mode, is bypassed in block rotation as a whole.

3. The device according to claim 1 , wherein in a third, disengaged shift position of the first shift element ( 12 ), the third element of the planetary gear set ( 8 ) is freely rotatable.

4. The device according to claim 1 , wherein with the second shift element ( 13 ) engaged, the first element of the planetary gear set ( 8 ) is fixedly coupled to both the first and the second transmission input shafts ( 6 , 7 ) of the first and the second subtransmissions ( 4 , 5 ), where in contrast with the second shift element ( 13 ) disengaged, the first element of the planetary gear set ( 8 ) is fixed coupled only to the first transmission input shaft ( 6 ) of the first subtransmission ( 4 ).

5. A drive train, of a hybrid vehicle having a hybrid drive, comprising:
an internal combustion engine ( 1 ), an electric machine ( 2 ), and a transmission ( 3 ) comprising first and second subtransmissions ( 4 , 5 ) being connected in parallel with one transmission input shaft ( 6 , 7 ) per subtransmission,
a planetary gear set ( 8 ) comprising a carrier ( 9 ), a sun gear ( 10 ) and a ring gear ( 11 ), a first element ( 9 , 10 or 11 ) of the planetary gear set serving for establishing a fixed connection to a first transmission input shaft ( 6 ) of the first subtransmission ( 4 ) of a transmission, and a second element ( 9 , 10 or 11 ) of the planetary gear set serving for establishing a fixed connection to the electric machine ( 2 ) of the hybrid drive,
a third element ( 9 , 10 or 11 ) of the planetary gear set being connectable, via a first shift position (A) of a first shift element ( 12 ), to a second transmission input shaft ( 7 ) of the second subtransmission ( 5 ) of the transmission, to which further an internal combustion engine ( 1 ) of the hybrid drive is connectable, and, via a second shift position (B) of the first shift element ( 12 ), being connectable to another element ( 9 , 10 or 11 ) of the planetary gear set,
a second shift element ( 13 ), and
when the second shift element ( 13 ) is engaged, both the first and the second transmission input shafts ( 6 , 7 ) of the first and the second subtransmissions ( 4 , 5 ) being coupled together, and when the second shift element ( 13 ) is disengaged, both of the first and the second transmission input shafts ( 6 , 7 ) of the first and the second subtransmissions ( 4 , 5 ) being separated from one another.

6. The drive train according to claim 5 , wherein the second transmission input shaft ( 7 ) of the second subtransmission ( 5 ) is coupled to the internal combustion engine ( 1 ) either without a clutch or by a separating clutch ( 14 ).

7. The drive train according to claim 5 , wherein a method for operating the device comprises:
either when the second shift element ( 13 ) is engaged and a gear is engaged in the first subtransmission ( 4 ), or when the second shift element ( 13 ) is disengaged and a gear is engaged in the second subtransmission ( 5 ), for shifting the first shift element ( 12 ) from the second shift position (B) into the first shift position (A), firstly, making the electric machine ( 2 ) completely load-free and the load thereof is at least partially transferred to the internal combustion engine ( 1 ), after that the second shift position (B) is disengaged load-free, and then the first shift position (A), after synchronization of the first shift element ( 12 ) with respect to the first shift position (A) using the electric machine ( 2 ), is engaged load-free, wherein the internal combustion engine ( 1 ) provides torque to a transmission output shaft ( 15 ) of the transmission ( 3 ), with the second shift element ( 13 ) engaged via the first subtransmission ( 4 ), and with the second shift element ( 13 ) disengaged via the second subtransmission ( 5 ).

8. The drive train according to claim 5 , wherein a method for operating the device comprises:
when the second transmission input shaft ( 7 ) of the second subtransmission ( 5 ) is coupled to the internal combustion engine ( 1 ) via a frictionally engaging separating clutch ( 14 ) that is operable with slip, for shifting the first shift element ( 12 ) from the first shift position (A) into the second shift position (B) with an initially completely engaged separating clutch ( 14 ), with an initially disengaged second shift element ( 13 ), with a gear initially engaged in the first subtransmission ( 4 ) and with the second subtransmission ( 5 ) initially in neutral, firstly, operating the separating clutch ( 14 ) with slip and a rotational speed of the second transmission input shaft ( 7 ) is made to approach a speed of the first transmission input shaft ( 6 ), then either the second shift element ( 13 ) is engaged or a gear is engaged in the second subtransmission ( 5 ), after that load is reduced at the electric machine ( 2 ), then the first shift position (A) is disengaged, and subsequently, the second shift position (B), after synchronization of the first shift element ( 12 ) with respect to the second shift position (B) using the electric machine ( 2 ), is engaged.

9. The drive train according to claim 5 , wherein a method for operating the device comprises:
when the second transmission input shaft ( 7 ) of the second subtransmission ( 5 ) is coupled to the internal combustion engine ( 1 ) via a frictionally engaging separating clutch ( 14 ) that is operable with slip, for shifting the first shift element ( 12 ) from the second shift position (B) into the first shift position (A) with an initially disengaged second shift element ( 13 ), with a gear initially engaged in the first subtransmission ( 4 ), and with the second subtransmission ( 5 ) initially in neutral, firstly, either disengaging or maintaining disengagement of the separating clutch, then either the second shift element ( 13 ) is engaged or a gear is engaged in the second subtransmission ( 5 ), after that with the separating cl

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Kaltenbach Johannes
• Borntrager Kai

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• B60K6/48 Primary

  Parallel type · CPC title

• F16H3/126

  using an electric drive · CPC title

• B60Y2400/421

  Dog type clutches or brakes · CPC title

• Y02T10/6221

  Cross-Sectional Technologies · mapped topic