Fail functional automated driving

Patent metadata

Field	Value
Publication number	US-10140237-B2
Application number	US-201615280923-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Sep 29, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A vehicle system includes a first communication path and a second communication path. The vehicle system further includes a processor programmed to determine a first communication speed associated with communicating over the first communication path and a secondary communication speed associated with communicating over the second communication path. The processor commands a first vehicle subsystem to communicate over the first communication path or the second communication path based at least in part on the first communication speed and the secondary communication speed.

First claim

The invention claimed is:

1. A vehicle system comprising:
a first vehicle subsystem;
a secondary vehicle subsystem;
a third vehicle subsystem in communication with the second vehicle subsystem;
a first communication path;
a second communication path;
a memory storing a look-up table identifying a first communication speed and a secondary communication speed; and
a processor programmed to determine the first communication speed associated with communicating over the first communication path and the secondary communication speed associated with communicating over the second communication path and commanding the first vehicle subsystem to communicate over one of the first communication path and the second communication path based at least in part on the first communication speed and the secondary communication speed,
wherein the processor is programmed to detect a failure associated with the secondary vehicle subsystem and command the first vehicle subsystem to communicate with the third vehicle subsystem over the first communication path in response to detecting the failure associated with the secondary vehicle subsystem and in response to determining that the first communication speed is faster than the secondary communication speed.

2. The vehicle system of claim 1 , wherein the processor is programmed to compare the first communication speed to the secondary communication speed.

3. The vehicle system of claim 2 , wherein the processor is programmed to command the first vehicle subsystem to communicate over the first communication path when the first communication speed is faster than the secondary communication speed and command the first vehicle subsystem to communicate over the second communication path when the secondary communication speed is faster than the first communication speed.

4. The vehicle system of claim 1 , wherein the processor is programmed to query the look-up table for the first communication speed and the secondary communication speed.

5. The vehicle system of claim 1 , wherein the processor is programmed to periodically update the look-up table.

6. The vehicle system of claim 5 , wherein the processor is programmed to periodically update at least one of the first communication speed and the secondary communication speed in the look-up table.

7. The vehicle system of claim 6 , wherein the processor is programmed to measure at least one of the first communication speed and the secondary communication speed.

8. The vehicle system of claim 7 , wherein the processor is programmed to measure at least one of the first communication speed and the secondary communication speed by monitoring a bus load and a transmit rate associated with one of the first communication path and the second communication path.

9. A method comprising:
determining a first communication speed associated with communicating over a first communication path by querying a lookup table stored in a vehicle memory;
determining a secondary communication speed associated with communicating over a second communication path by querying the lookup table stored in the vehicle memory;
commanding a first vehicle subsystem to communicate over one of the first communication path and the second communication path based at least in part on the first communication speed and the secondary communication speed;
detecting a failure associated with a secondary vehicle subsystem; and
commanding the first vehicle subsystem to communicate with a third vehicle subsystem over the first communication path as a result of detecting the failure associated with the secondary vehicle subsystem and as a result of determining that the first communication speed is faster than the secondary communication speed.

10. The method of claim 9 , further comprising comparing the first communication speed to the secondary communication speed.

11. The method of claim 10 , wherein commanding the first vehicle subsystem to communicate over one of the first communication path and the second communication path includes commanding the first vehicle subsystem to communicate over the first communication path when the first communication speed is faster than the secondary communication speed and commanding the first vehicle subsystem to communicate over the second communication path when the secondary communication speed is faster than the first communication speed.

12. The method of claim 9 , further comprising periodically updating the look-up table.

13. The method of claim 12 , wherein periodically updating the look-up table includes periodically updating at least one of the first communication speed and the secondary communication speed in the look-up table.

14. The method of claim 13 , further comprising measuring at least one of the first communication speed and the secondary communication speed.

15. The method of claim 14 , wherein measuring at least one of the first communication speed and the secondary communication speed includes monitoring a bus load and a transmit rate associated with one of the first communication path and the second communication path.

Assignees

• Ford Global Tech Llc

Inventors

• She Eric

Classifications

• B60R16/023

  for transmission of signals between vehicle parts or subsystems · CPC title

• G06F13/4068 Primary

  Electrical coupling · CPC title

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title

• H04L45/125 Primary

  based on throughput or bandwidth · CPC title

• H04L45/121

  by minimising delays · CPC title