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

Patent metadata

Field	Value
Publication number	US-2019105980-A1
Application number	US-201715729145-A
Country	US
Kind code	A1
Filing date	Oct 10, 2017
Priority date	Oct 10, 2017
Publication date	Apr 11, 2019
Grant date	—

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 to 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.

19 . A selective booster for an electric machine in a hybrid drivetrain, comprising:
a first planetary gearset having a first ring gear, a first planet gear carrier, and a first sun gear, the first planet gear carrier secured to a rotatable shaft for rotation therewith; and a second planetary gearset having a second ring gear configured to receive an input from an electric machine, a second planet gear carrier secured to the first sun gear for rotation therewith, and a second sun gear secured to the rotatable shaft for rotation therewith; wherein the first and second planetary gearsets cooperate to provide a plurality of gear ratios between the second ring gear and the rotatable shaft, the plurality of gear ratios including at least a speed reduction gear ratio and a speed increasing gear ratio.

20 . The selective booster of claim 19 , 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.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Liu Bradford P

Classifications

• B60K2006/381

  characterized by driveline brakes · CPC title

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title

• B60K6/445

  Differential gearing distribution type · CPC title

• F16H2200/2038

  with three engaging means · CPC title