Causing a difference between steering angles of front wheels or rear wheels of a vehicle in a park mode

Patent metadata

Field	Value
Publication number	US-11970231-B2
Application number	US-202117319172-A
Country	US
Kind code	B2
Filing date	May 13, 2021
Priority date	May 13, 2021
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

A vehicle can include a first wheel, a second wheel, and a steering system. Either both the first wheel and the second wheel can be front wheels or both the first wheel and the second wheel can be rear wheels. The steering system can be configured to concurrently cause: (1) a steering angle of the first wheel to be at a first angle and (2) a steering angle of the second wheel to be at a second angle. A difference angle can be a difference of the first angle subtracted from the second angle and can be greater than an angle determined to comply with Ackermann steering geometry. Such a difference angle can act to securely brake the vehicle when the vehicle is parked at a location at which a three-dimensional shape of a topological relief of the location can complicate an effort to securely brake the vehicle.

First claim

What is claimed is:

1. A vehicle, comprising:
a first wheel;
a second wheel; and
a steering system configured to concurrently cause, at a time at which the vehicle is in a park mode:
a steering angle of the first wheel to be at a first angle; and
a steering angle of the second wheel to be at a second angle,

wherein:
the steering system comprises:
a first actuator configured to cause the first wheel to be at the first angle, and
a second actuator configured to cause the second wheel to be at the second angle,

a first difference angle, being a difference of the first angle subtracted from the second angle, is greater than an angle determined to comply with Ackermann steering geometry, and
either both the first wheel and the second wheel are front wheels or both the first wheel and the second wheel are rear wheels.

2. The vehicle of claim 1 , wherein:
the steering system is configured to determine the steering angle of the first wheel and the steering angle of the second wheel,
the first actuator is further configured to cause the first wheel to be in a position in accordance with a determination of the steering angle of the first wheel; and
the second actuator is further configured to cause the second wheel to be in a position in accordance with a determination of the steering angle of the second wheel, and
the steering system is configured to independently operate the first actuator and the second actuator.

3. The vehicle of claim 1 , wherein the steering system is configured to concurrently prevent, at a time at which the vehicle is in a mode different from the park mode:
the steering angle of the first wheel from being at the first angle; and
the steering angle of the second wheel from being at the second angle.

4. The vehicle of claim 1 :
further comprising a communications device configured to:
receive information; and
cause, in response to a receipt of the information, a signal to be conveyed to the steering system,

wherein the steering system is configured to concurrently cause, in response to a receipt of the signal:
the steering angle of the first wheel to be at the first angle; and
the steering angle of the second wheel to be at the second angle.

5. The vehicle of claim 1 :
further comprising a communications device configured to:
receive information indicative of a value of the first angle and a value of the second angle; and
cause, in response to a receipt of the information, a signal to be conveyed to the steering system,

wherein the steering system is configured to cause, in response to a receipt of the signal:
the value of the first angle to be stored in a memory of the steering system, and
the value of the second angle to be stored in the memory of the steering system.

6. The vehicle of claim 1 , wherein the steering system comprises:
a module configured to determine a value of the first angle and a value of the second angle; and
a memory configured to store the value of the first angle and the value of the second angle.

7. The vehicle of claim 6 :
further comprising a device configured to:
determine an orientation of the vehicle with respect to a three-dimensional shape of a topological relief of a location of the vehicle; and
cause, in response to a determination of the orientation of the vehicle, a signal to be conveyed to the steering system,

wherein the module is configured to determine, in response to a receipt of the signal, the value of the first angle and the value of the second angle.

8. The vehicle of claim 6 :
further comprising a device configured to:
determine a presence of a curb of a road within one meter of a location of at least one of the first wheel or the second wheel; and
cause, in response to a determination of the presence of the curb, a signal to be conveyed to the steering system,

wherein the module is configured to determine, in response to a receipt of the signal, the value of the first angle and the value of the second angle.

9. The vehicle of claim 1 :
further comprising:
a third wheel; and
a fourth wheel,

wherein:
the steering system is further configured to concurrently cause:
a steering angle of the third wheel to be at a third angle; and
a steering angle of the fourth wheel to be at a fourth angle, and

a second difference angle, being a difference of the third angle subtracted from the fourth angle, is greater than the angle determined to comply with Ackermann steering geometry.

10. The vehicle of claim 1 , wherein the angle determined to comply with Ackermann steering geometry is ten degrees.

Assignees

• Toyota Eng & Mfg North America

Inventors

• Zwegers Corey
• Macarthur Robert C
• Ma Claudia A
• Shibata Shigenori
• Vanantwerp Adam R

Classifications

• B62D7/1545 Primary

  provided with electrical assistance · CPC title

• B62D5/006

  power actuated · CPC title

• B62D6/008

  Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications · CPC title

• B62D7/1509 Primary

  with different steering modes, e.g. crab-steering, or steering specially adapted for reversing of the vehicle · CPC title

• B62D6/002

  computing target steering angles for front or rear wheels (B62D7/159 takes precedence) · CPC title