Method for optimized autonomous driving of a vehicle

Patent metadata

Field	Value
Publication number	US-11518407-B2
Application number	US-202017011024-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Sep 5, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Method and device for optimized autonomous driving, wherein a trajectory for the actuation of the vehicle is determined. A profile of the trajectory is defined by a bending line of a bending band. The bending line is preferably determined by the finite element method, in particular according to the principle of virtual shifting, and achieves an optimization goal and satisfies a boundary condition. The boundary condition is defined in accordance with a profile of a roadway for the vehicle. The optimization goal is defined by a desired driving property of the vehicle.

First claim

What is claimed:

1. A method for optimized autonomous driving of a vehicle, the method comprising:
determining, by a processor of a vehicle, a trajectory for the vehicle;
defining, by the processor of the vehicle, a profile of the trajectory using as a model a bending band, the bending band comprised of a node comprising:
a) discrete structural elements connected to each other at a-the node and arranged along a longitudinal bearing, the discrete structural elements having a respective longitudinal rigidity that resist deviation from the longitudinal bearing,
b) a set of compression springs connected to one of the discrete structural elements of the node, the springs extending transversely from opposite sides of the node, the compression springs each having a respective flexural rigidity that resist deviation from the longitudinal bearing, and
c) a coiled torsion spring that interconnects the discrete structural elements together at the node, the coiled torsion spring having a torsional rigidity that resists deviation from the longitudinal bearing, the coiled torsion spring having (i) a first end connected to one of the discrete structural elements, (ii) a central part connected to an end of said one of the discrete structural elements, and (iii) a second end connected to an end of the other discrete structural element of the discrete structural elements as well as the set of compression springs;

determining, by the processor of the vehicle, a bending line of the bending band which deviates from the longitudinal bearing and achieves an optimization goal and satisfies a boundary condition using a finite element method;
defining, by the processor of the vehicle, the boundary condition in accordance with a profile of a roadway for the vehicle;
defining, by the processor of the vehicle, the optimization goal by a desired driving property of the vehicle; and
controlling, by the processor of the vehicle, an actuator to autonomously drive the vehicle along the trajectory according to the bending line which achieves the optimization goal.

2. The method as claimed in claim 1 , wherein the bending band is defined by a multiplicity of the discrete elements, wherein a parameter which defines a property of the discrete elements is determined for at least one of the discrete elements, wherein a setpoint value for the parameter is defined in accordance with the desired driving property, and wherein the optimization goal is defined in accordance with a deviation of the parameter from the setpoint value.

3. The method as claimed in claim 2 , wherein the parameter defines a flexural rigidity, torsional rigidity, longitudinal rigidity or rigidity of a bearing of said at least one of the discrete elements which centers said at least one of the discrete elements with respect to a representation of the roadway.

4. The method as claimed in claim 2 , wherein the setpoint value is defined in accordance with a longitudinal acceleration or lateral acceleration of the vehicle, the derivation of which or to a limiting value thereof is based at a transition from a right-left bend combination or a left-right bend combination.

5. The method as claimed in claim 2 , wherein the setpoint value is defined in accordance with a curvature radius or a limiting value for said curvature radius.

6. The method as claimed in claim 2 , wherein the setpoint value is defined in accordance with driver input of a desired driving style.

7. The method as claimed in claim 2 , wherein the setpoint value is defined in accordance with an engine temperature, a tire temperature, or a fuel consumption value.

8. The method as claimed in claim 2 , wherein the trajectory is determined in accordance with an optimization goal which is defined in accordance with a plurality of setpoint values and a plurality of parameters, the method further comprising checking whether requirements of the setpoint values compete with one another, and wherein the bending line is determined iteratively for various parameters until the optimization goal is achieved.

9. The method as claimed in claim 8 , further comprising:
determining a first trajectory,
determining at least one changed parameter in accordance with a speed profile for the first trajectory, and
determining a second trajectory in accordance with the changed parameter.

10. The method as claimed in claim 1 , wherein the bending band has a limited length with a predefined number of the discrete elements, wherein just one part of the trajectory is defined in its profile through a bending line of the bending band, wherein while a first part of the trajectory which is defined by the profile of the bending line of a first of the discrete elements is being travelled through, the profile of the bending line of the other discrete elements of the predefined number of discrete elements and of an additional discrete element which is connected to a last of the discrete elements is calculated for a profile of an additional trajectory part which adjoins the part of the trajectory.

11. A device for optimized autonomous driving, wherein the device comprises a computing apparatus, a sensing apparatus and an actuation apparatus which are configured to interact in order to execute the method as claimed in claim 1 .

12. The method as claimed in claim 1 , wherein the bending band is comprised of a plurality of said nodes.

13. The method as claimed in claim 12 , wherein said nodes are arranged in parallel.

14. The method as claimed in claim 12 , wherein adjacent nodes of said nodes share one the discrete structural elements.

15. The method as claimed in claim 1 , wherein the discrete structural elements are not directly connected to each other.

Assignees

• Porsche Ag

Inventors

• Tardy-Tuch Georg
• Strecker Florian
• Glatz Michael

Classifications

• B60W40/12

  related to parameters of the vehicle itself {, e.g. tyre models} · CPC title

• B60W40/107

  Longitudinal acceleration · CPC title

• B60W40/109

  Lateral acceleration · CPC title

• B60W2530/209

  Fuel quantity remaining in tank · CPC title

• B60W60/0023

  in response to energy consumption · CPC title