Estimation of vehicle speed in all-wheel-drive vehicle

Patent metadata

Field	Value
Publication number	US-11878674-B2
Application number	US-202318165575-A
Country	US
Kind code	B2
Filing date	Feb 7, 2023
Priority date	Oct 9, 2018
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A vehicle includes an all-wheel-drive powertrain having an electric machine configured to power wheels. A controller is programmed to output a first calculated vehicle speed derived from integrating a measured longitudinal acceleration of the vehicle and output a second calculated vehicle speed based on the measured longitudinal acceleration and a speed of one of the wheels. The controller is further programmed to, responsive to a flag being present, command a speed to the electric machine that is based on the first vehicle speed to reduce wheel slip, and responsive to a flag not being present, command a speed to the electric machine that is based on the second vehicle speed to reduce wheel slip.

First claim

What is claimed is:

1. A vehicle comprising:
an all-wheel-drive powertrain including an electric machine configured to power wheels; and
a controller programmed to
output a first calculated vehicle speed derived from integrating a measured longitudinal acceleration of the vehicle,
output a second calculated vehicle speed based on the measured longitudinal acceleration and a speed of one of the wheels,
responsive to a flag being present, command a speed to the electric machine that is based on the first vehicle speed to reduce wheel slip, and
responsive to a flag not being present, command a speed to the electric machine that is based on the second vehicle speed to reduce wheel slip.

2. The vehicle of claim 1 , wherein the second vehicle speed is further based on a grade offset acceleration.

3. The vehicle of claim 2 , wherein the grade offset acceleration is derived from a difference between acceleration of the wheels and the measured acceleration of the vehicle.

4. The vehicle of claim 1 further comprising, responsive to speed being commanded to the electric machine based on the first vehicle speed and a flag not being present, command a speed to the electric machine such that an acceleration of the electric machine is less than a threshold.

5. The vehicle of claim 1 , wherein the flag is indicative of at least one of a traction control event, a stability control event, or an anti-lock braking system event.

6. The vehicle of claim 1 , wherein the powertrain further includes a second electric machine, a front axle powered by one of the electric machines, and a rear axle powered by the other of the electric machines.

Assignees

• Ford Global Tech Llc

Inventors

• Velazquez Alcantar Jose
• Torres Joseph Jay
• Barrette Peter James
• Bruns Richard David
• Stout Corwin
• Johri Rajit

Classifications

• B60W20/10 Primary

  Controlling the power contribution of each of the prime movers to meet required power demand · CPC title

• B60K6/52

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

• B60L15/38

  with automatic control · CPC title

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T8/175

  Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16) · CPC title