Hybrid powertrain with a gearbox and method to control the hybrid drivetrain

Patent metadata

Field	Value
Publication number	US-9770969-B2
Application number	US-201414780463-A
Country	US
Kind code	B2
Filing date	Mar 20, 2014
Priority date	Mar 27, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A hybrid powertrain that includes a combustion engine ( 4 ); a gearbox ( 2 ) with an input shaft ( 8 ) and an output shaft ( 20 ); a first planetary gear ( 10 ) connected to the input shaft ( 8 ) a second planetary gear ( 12 ) connected to the first planetary gear ( 10 ); a first electrical machine ( 14 ) connected to the first planetary gear ( 10 ); a second electrical machine ( 16 ) connected to the second planetary gear ( 12 ); a first gear pair (G 1, 60 ) and a third gear pair (G 1, 72 ) situated between the first planetary gear ( 10 ) and the output shaft ( 20 ); and a second gear pair ( 66 ) and a fourth gear pair (G 2, 78 ) situated between the second planetary gear ( 12 ) and the output shaft ( 20 ); a countershaft ( 18 ) provided between the respective first and the second planetary gears ( 10, 12 ) and the output shaft ( 2 ), and ( 18 ) connected to the output shaft ( 20 ) via a fifth gear pair (G 3 M 21 ). Also, disclosed is a method for controlling the hybrid powertrain. Also a method for controlling a hybrid powertrain ( 3 ) and a computer program (P) for controlling the hybrid powertrain ( 3 ).

First claim

The invention claimed is:

1. A hybrid powertrain comprising:
a combustion engine;
a gearbox with an input shaft and an output shaft;
a first planetary gear connected to the input shaft and a first mainshaft;
a second planetary gear connected to the first planetary gear and a second mainshaft;
a first electrical machine connected to the first planetary gear;
a second electrical machine connected to the second planetary gear;
a first gear pair and a third gear pair, which are situated between the first planetary gear and the output shaft;
a second gear pair and a fourth gear pair, which are situated between the second planetary gear and the output shaft;
a countershaft provided between the respective first and second planetary gears and the output shaft,
wherein a second planet wheel carrier of the second planetary gear is connected to the second mainshaft,
wherein the input shaft is directly connected to a first planet wheel carrier of the first planetary gear, and rotates the first planet wheel carrier; and
the countershaft is connected to the output shaft via a fifth gear pair.

2. A hybrid powertrain according to claim 1 , wherein the first and third gear pairs are situated on the first mainshaft and the countershaft, and the second and fourth gear pairs are situated on the second mainshaft and the countershaft.

3. A hybrid powertrain according to claim 2 , wherein the first planet wheel carrier of the first planetary gear is connected to a second sunwheel of the second planetary gear, and a first sunwheel of the first planetary gear is connected to the second mainshaft.

4. A hybrid powertrain according to claim 2 , wherein a clutch mechanism is provided between the first mainshaft and the output shaft.

5. A hybrid powertrain according to claim 2 , wherein the first gear pair comprises a first pinion attached firmly to the first mainshaft and in mutual engagement with a first gearwheel which is arranged to be connectable to and disconnectable from the countershaft, and wherein the third gear pair comprises a third pinion attached firmly to the first mainshaft and in mutual engagement with a third gearwheel which is arranged to be connectable to and disconnectable from the countershaft.

6. A hybrid powertrain according to claim 5 , wherein the second gear pair comprises a second pinion attached firmly to the second mainshaft and in mutual engagement with a second gearwheel which is arranged to be connectable to and disconnectable from the countershaft, and wherein the fourth gear pair comprises a fourth pinion attached firmly to the second mainshaft and in mutual engagement with a fourth gearwheel which is arranged to be connectable to and disconnectable from the countershaft.

7. A hybrid powertrain according to claim 1 , wherein the fifth gear pair comprises a gearshift element arranged to be disconnectable from the countershaft by a fifth clutch element.

8. A hybrid powertrain according to claim 7 , wherein the gearshift element of the fifth gear pair is a fifth gearwheel in engagement with a sixth gearwheel which is attached firmly to the output shaft.

9. A hybrid powertrain according to claim 6 , wherein the first, second, third and fourth gearwheels are arranged to be connectable to and disconnectable from the countershaft by respective first, second, third and fourth clutch elements.

10. A hybrid powertrain according to claim 1 , wherein a first rotor of the first electrical machine is connected to a first ring gear of the first planetary gear, and a second rotor of the second electrical machine is connected to a second ring gear of the second planetary gear.

11. A hybrid powertrain according to claim 3 , wherein a first clutch unit is arranged to connect the first sunwheel releasably to the first planet wheel carrier, and a second clutch unit is arranged to connect the second sunwheel releasably to the second planet wheel carrier.

12. A vehicle comprising an engine and a hybrid powertrain according to claim 1 .

13. A method for controlling a hybrid powertrain in order to effect gear changes without torque breaks, wherein the hybrid powertrain comprises a combustion engine;
a gearbox with an input shaft and an output shaft;
a first planetary gear connected to the input shaft and a first mainshaft;
a second planetary gear connected to the first planetary gear and a second mainshaft;
a first electrical machine connected to the first planetary gear;
a second electrical machine connected to the second planetary gear;
a first gear pair and a third gear pair which are situated between the first planetary gear and the output shaft; and
a second gear pair and a fourth gear pair which are situated between the second planetary gear and the output shaft,
wherein a second planet wheel carrier of the second planetary gear is connected to the second mainshaft, and
wherein the input shaft is connected to a first planet wheel carrier of the first planetary gear, the method comprising:
a) connecting the first or the third gear pair,
b) connecting the second or the fourth gear pair,
c) connecting a fifth gear pair to a countershaft so that the countershaft is connected to the output shaft, and
d) engaging a gear by connecting together two rotatable components of the second planetary gear.

14. A method according to claim 13 , wherein steps a), b) and c) are conducted in parallel.

15. A method according to claim 13 , wherein the first gear pair comprises a first pinion attached firmly to the first planetary gear and in mutual engagement with a first gearwheel which is arranged to be connectable to and disconnectable from the countershaft, and wherein the third gear pair comprises a third pinion attached firmly to the first planetary gear and in mutual engagement with a third gearwheel which is arranged to be connectable to and disconnectable from the countershaft, such that at step a) the first or the third gearwheel is connected to the countershaft.

16. A method according to claim 13 , wherein the second gear pair comprises a second pinion attached firmly to the second planetary gear and in mutual engagement with a second gearwheel which is arranged to be connectable to and disconnectable from the countershaft, and wherein the fourth gear pair comprises a fourth pinion attached firmly to the second planetary gear and in mutual engagement with a fourth gearwheel which is arranged to be connectable to and disconnectable from the countershaft, such that at step b) the second or the fourth gearwheel is connected to the countershaft.

17. A method according to claim 13 , wherein the fifth gear pair comprises a fifth gearwheel which is arranged to be connectable to and disconnectable from the countershaft by a fifth clutch element and is in mutual engagement with a sixth gearwheel which is attached firmly to the output shaft, such that at step c) the fifth gearwheel is connected to the countershaft.

18. A method according to claim 13 , wherein, at step d), the two rotatable components comprise a second sunwheel and a second planet wheel carrier, and further comprising operating the combustion engine to reach a synchronized speed between the second sunwheel and the second planet wheel carrier, and then moving a second clutch unit to lock the second sunwheel and the second planet wheel carrier to one another.

19. A method according to claim 13 , further comprising,
e) disconnecting the rotatable components of the second planetary gear from one another, and
f) engaging a subsequent gear by using a first clutch unit to connect two rot

Assignees

• Scania Cv Ab

Inventors

• Björkman Mathias
• Pettersson Niklas
• Lindström Johan
• Bergquist Mikael

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• F16H61/686

  with orbital gears · CPC title

• B60Y2400/73

  Planetary gearings · CPC title

• B60K6/365 Primary

  with the gears having orbital motion · CPC title

• Y10S903/911

  with two or more gear sets · CPC title