Dual electric machine co-drive system with selective booster of electric machine

Patent metadata

Field	Value
Publication number	US-10549624-B2
Application number	US-201715729145-A
Country	US
Kind code	B2
Filing date	Oct 10, 2017
Priority date	Oct 10, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A hybrid drivetrain for a vehicle may include a co-drive manipulator having a first input configured to be driven by an internal combustion engine, and a second input configured to be driven by a first electric machine. The hybrid drivetrain may also include a selective booster having first and second planetary gearsets, each of the first and second planetary gearsets having a rotating component secured for rotation with a rotatable shaft driven by the co-drive manipulator, such that a rotational input received at the second planetary gearset from a second electric machine selectively drives the output shaft with a plurality of gear ratios including at least a speed reduction gear ratio and a speed increasing gear ratio.

First claim

What is claimed is:

1. A hybrid drivetrain for a vehicle, comprising:
a co-drive manipulator having a first input configured to be driven by an internal combustion engine, and a second input configured to be driven by a first electric machine; and
a selective booster including first and second planetary gearsets, each of the first and second planetary gearsets having a rotating component secured for rotation with a rotatable shaft driven by the co-drive manipulator, such that a rotational input received at the second planetary gearset from a second electric machine selectively drives the rotatable shaft with a plurality of gear ratios including at least a speed reduction gear ratio and a speed increasing gear ratio.

2. The hybrid drivetrain of claim 1 , wherein the selective booster further comprises:
a rotational clutch configured to selectively fix a first ring gear of the first planetary gearset to a second planet gear carrier of the second planetary gearset for rotation therewith; and
a first brake clutch configured to selectively restrict rotation of the first ring gear.

3. The hybrid drivetrain of claim 1 , further comprising a rotational clutch configured to selectively restrict relative rotation between components of the first and second planetary gearsets.

4. The hybrid drivetrain of claim 3 , wherein the rotational clutch is configured to selectively restrict rotation of a second planet gear carrier of the second planetary gearset with respect to a first ring gear of the first planetary gearset.

5. The hybrid drivetrain of claim 4 , wherein the second planet gear carrier is linked to a first sun gear of the first planetary gearset for rotation therewith.

6. The hybrid drivetrain of claim 2 , further comprising a second brake clutch configured to selectively restrict rotation of the second planet gear carrier.

7. The hybrid drivetrain of claim 1 , further comprising a brake clutch configured to restrict rotation of a sun gear of the first planetary gearset and a planet gear carrier of the second planetary gearset.

8. The hybrid drivetrain of claim 1 , further comprising an input brake clutch configured to selectively restrict rotation of the first input.

9. The hybrid drivetrain of claim 1 , wherein the first planetary gearset includes a first sun gear secured to a second planet gear carrier of the second planetary gearset for rotation therewith.

10. The hybrid drivetrain of claim 1 , wherein the rotating component of the first planetary gearset is a first planet gear carrier of the first planetary gearset, and the rotating component of the second planetary gearset is a second sun gear of the second planetary gearset.

11. The hybrid drivetrain of claim 1 , wherein the co-drive manipulator includes a third planetary gearset.

12. The hybrid drivetrain of claim 11 , wherein the first input is a third planetary gear carrier of the third planetary gearset, the second input is a third sun gear of the third planetary gearset, and the rotatable shaft is driven by a third ring gear of the third planetary gearset.

13. The hybrid drivetrain of claim 12 , wherein the rotatable shaft is one of co-axial and offset with respect to the third ring gear.

14. The hybrid drivetrain of claim 1 , wherein the selective booster further comprises:
a rotational clutch configured to selectively fix a first ring gear of the first planetary gearset to a second planet gear carrier of the second planetary gearset for rotation therewith;
a first brake clutch configured to selectively restrict rotation of the first ring gear with respect to a stationary housing; and
a second brake clutch configured to selectively restrict rotation of the second planet gear carrier with respect to the stationary housing.

15. The hybrid drivetrain of claim 1 , wherein the second electric machine is a primary electric machine of the hybrid drivetrain.

16. A hybrid vehicle, comprising:
an internal combustion engine;
a plurality of electric machines;
a co-drive manipulator having a first input configured to be driven by the internal combustion engine, and a second input configured to be driven by a first one of the plurality of electric machines; and
a selective booster including first and second planetary gearsets, each of the first and second planetary gearsets having a rotating component secured for rotation with a rotatable shaft driven by the co-drive manipulator, such that a rotational input received at the second planetary gearset from a second one of the plurality of the electric machines selectively drives the rotatable shaft with a plurality of gear ratios including at least a speed reduction gear ratio and a speed increasing gear ratio.

17. The hybrid vehicle of claim 16 , further comprising:
a rotational clutch configured to selectively fix the first ring gear of the first planetary gearset to the second planet gear carrier of the second planetary gearset for rotation therewith;
a first brake clutch configured to selectively restrict rotation of the first ring gear with respect to a stationary housing; and
a second brake clutch configured to selectively restrict rotation of the second planet gear carrier with respect to the stationary housing.

18. The hybrid vehicle of claim 16 , further comprising a brake clutch configured to restrict rotation of a sun gear of the first planetary gearset and a planet gear carrier of the second planetary gearset.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Liu Bradford P

Classifications

• B60K6/445

  Differential gearing distribution type · CPC title

• F16H2200/201

  with three sets of orbital gears · CPC title

• B60K6/543 Primary

  the transmission being a continuously variable transmission · CPC title

• F16H2200/2038

  with three engaging means · CPC title

• B60K6/44

  Series-parallel type · CPC title