Vehicle parking assist system

Patent metadata

Field	Value
Publication number	US-9849864-B2
Application number	US-201514814855-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Jul 31, 2015
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A parking assist system for a vehicle is provided that includes a brake system having at least one wheel count encoder configured to output a wheel count signal and a controller configured to limit a velocity of the vehicle in a first mode. The controller is also configured to stop the vehicle at a target location in a second mode, and prevent overshoot of the target location by the vehicle in a third mode.

First claim

What is claimed is:

1. A parking assist system for a vehicle, comprising:
a brake system having at least one wheel count encoder configured to output a wheel count signal; and
a controller configured to limit a velocity of the vehicle in a first mode, configured to stop the vehicle at a target location in a second mode, and configured to prevent overshoot of the target location by the vehicle in a third mode by outputting a brake torque inversely proportional to a calculated distance to the target stop location of the vehicle.

2. The parking assist system of claim 1 , further comprising a scheduler configured to convert the wheel count signal into a linear distance traveled by the vehicle.

3. The parking assist system of claim 2 , wherein the second mode of the controller is operated in a proportional-derivative control based on a distance error signal.

4. The parking assist system of claim 1 , wherein the controller is configured to transition from the first mode to the second mode at a predetermined distance threshold from the target location.

5. The parking assist system of claim 4 , wherein the third mode of the controller is configured to stop the vehicle at the target location with essentially no overshoot.

6. A parking assist system for a vehicle, comprising:
a scheduler in electrical communication with a parking aid controller and a vehicle communication bus and configured to output feedback signals to a control module configured to operate in a first, a second and a third mode, wherein the control module in the third mode is configured to output a brake torque inversely proportional to a calculated distance to a target stop location of the vehicle.

7. The parking assist system of claim 6 , wherein the first mode is operated in a proportional-integral control based on a velocity error signal.

8. The parking assist system of claim 7 , wherein the second mode of the control module is configured to be operated in a proportional-derivative control based on a distance error signal.

9. The parking assist system of claim 8 , wherein the second mode of the control module is configured to stop the vehicle at the target location.

10. The parking assist system of claim 6 , wherein the feedback signals include at least a distance error signal and a velocity error signal.

Assignees

• Ford Global Tech Llc

Inventors

• Bales John
• Hafner Michael

Classifications

• B60T2201/10

  Automatic or semi-automatic parking aid systems · CPC title

• B60T8/1708

  for lorries or tractor-trailer combinations · CPC title

• B60T7/22 Primary

  initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle {, or by means of contactless obstacle detectors mounted on the vehicle} · CPC title

• B60T2201/022

  Collision avoidance systems · CPC title