Vehicle transmission and method for operation of said transmission

Patent metadata

Field	Value
Publication number	US-11549570-B2
Application number	US-202217809216-A
Country	US
Kind code	B2
Filing date	Jun 27, 2022
Priority date	May 22, 2020
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

Methods and systems for a vehicle transmission are provided. In one example, a vehicle transmission system includes a first planetary gear set rotationally coupled to a second planetary gear set and a first electrical machine rotationally coupled to a gear in the first planetary gear set. The vehicle transmission system further includes a second electrical machine rotationally coupled to a gear in the second planetary gear set and a first clutch configured to selectively disconnect the first and second planetary gear sets from a drive axle.

First claim

The invention claimed is:

1. A method for operating a vehicle transmission system, comprising:
during a first operating condition, operating a clutch to rotationally disconnect a first planetary gear set and a second planetary gear set from a drive axle; and
during a second operating condition, operating the clutch to rotationally connect the first planetary gear set and the second planetary gear set to the drive axle;
wherein the first planetary gear set is rotationally coupled to a first electrical machine; and
wherein the second planetary gear set is rotationally coupled to a second electrical machine.

2. The method of claim 1 , wherein operating the clutch to rotationally disconnect the first planetary gear set and the second planetary gear set from the drive axle comprises bringing an output of the vehicle transmission to a zero-torque state.

3. The method of claim 1 , wherein the vehicle transmission system comprises an inverter electrically coupled to the first and second electrical machines and an electrical energy storage device and wherein the inverter is not configured to the inverter is not configured to guarantee a zero-torque state for the first and second electrical machines.

4. The method of claim 3 , wherein the vehicle transmission system further comprises an electrical power take-off electrically coupled to the inverter.

5. The method of claim 1 , wherein the first operating condition is a condition where a period of time the vehicle remains at rest exceeds a threshold value and/or a fault state condition.

Assignees

• Dana Belgium Nv

Inventors

• Van Dingenen Joachim
• Versini Jessica
• Verstraete Dries
• Hannon Bert

Classifications

• F16H2200/2007

  with two sets of orbital gears · CPC title

• B60K2006/542

  with overdrive ratio · CPC title

• F16H2200/0021

  specially adapted for electric vehicles · CPC title

• B60K2025/022

  by a mechanical transmission · CPC title

• B60K2006/266

  with two coaxial motors or generators · CPC title