Dynamic torque profiles based on drive mode selection

Patent metadata

Field	Value
Publication number	US-10279799-B2
Application number	US-201615376986-A
Country	US
Kind code	B2
Filing date	Dec 13, 2016
Priority date	Dec 13, 2016
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A method for controlling an electric rear axle drive (eRAD) includes, responsive to a vehicle being in DRIVE, operating the eRAD such that any torque output by the eRAD to drive rear wheels forward is less than torque output to drive front wheels forward. The method further includes, responsive to the vehicle being in REVERSE, operating the eRAD such that torque output by the eRAD to drive the rear wheels backwards is more than any torque output to drive the front wheels backwards.

First claim

What is claimed is:

1. A method for controlling an electric rear axle drive (eRAD), comprising:
responsive to a vehicle being in DRIVE, operating the eRAD such that torque output by the eRAD to drive rear wheels forward is less than 50% of a total commanded torque;
responsive to the vehicle being in REVERSE, operating the eRAD such that torque output by the eRAD to drive the rear wheels backwards is 60-90% of the total commanded torque; and
reducing torque output by the eRAD to drive the rear wheels backwards to less than 50% of a total commanded torque in response to a total commanded torque being greater than a total available torque at the eRAD.

2. The method of claim 1 further comprising:
reducing torque output by the eRAD to drive the rear wheels backwards to less than 50% of a total commanded torque in response to a state of charge (SOC) decreasing below a threshold of 10% SOC.

3. The method of claim 1 further comprising:
reducing torque output by the eRAD to drive the rear wheels backwards to less than 50% of a total commanded torque in response to a determination of low traction at the rear wheels.

4. The method of claim 1 wherein while in DRIVE, torque output by the eRAD to drive the rear wheels forward is 30%.

5. The method of claim 1 wherein while in REVERSE, torque output by the eRAD to drive the rear wheels backwards is 70%.

6. A method for controlling an electric rear axle drive (eRAD), comprising:
responsive to the vehicle being in REVERSE, by the eRAD, effecting a rear torque output to drive rear wheels backwards; and
while in REVERSE, responsive to a detected condition, reducing the rear torque output by the eRAD to 0% of the total commanded torque such that front torque output to drive front wheels backwards is more than the rear torque output by the eRAD.

Assignees

• Ford Global Tech Llc

Inventors

• De Hesselle Eric
• Siciak Raymond C

Classifications

• B60W10/06 Primary

  including control of combustion engines · CPC title

• B60K2023/085

  automatically actuated · CPC title

• B60W2710/0666

  Engine torque · CPC title

• B60K6/52 Primary

  Driving a plurality of drive axles, e.g. four-wheel drive · CPC title

• B60K17/356

  having fluid or electric motor, for driving one or more wheels · CPC title