System and method for a vehicle diagnostic wakeup

Patent metadata

Field	Value
Publication number	US-11568686-B2
Application number	US-202017076479-A
Country	US
Kind code	B2
Filing date	Oct 21, 2020
Priority date	Oct 21, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Systems and methods for waking a controller from a sleep mode are described. In one example, the controller may be woke in response to an estimated amount of time that it will take for a temperature in an evaporative emissions system to be within a threshold temperature of ambient temperature.

First claim

The invention claimed is:

1. A method for operating a controller of a vehicle, comprising:
estimating a time that a temperature at a location in an evaporative emissions system will be within a threshold temperature of ambient temperature based on the temperature at the location; and
waking a controller from a sleep mode at the estimated time.

2. The method of claim 1 , wherein the time is estimated according to one of a plurality of cooling curves.

3. The method of claim 2 , where each of the plurality of cooling curves follow an exponential decay trajectory.

4. The method of claim 1 , where the sleep mode is a mode where operation of the controller is reduced to a first power consumption level that is lower than when a power consumption level of the controller when the vehicle is activated.

5. The method of claim 1 , further comprising beginning a diagnostic after waking the controller, the diagnostic performed without the vehicle being activated by a user.

6. The method of claim 5 , where the diagnostic is an evaporative emissions breach diagnostic.

7. The method of claim 1 , where the time is determined via Euler's number.

8. A vehicle system, comprising:
an evaporative emissions system of a vehicle including a fuel vapor storage canister and a fuel tank; and
a controller including executable instruction stored in non-transitory memory that cause the controller to wake from a sleep mode to an operating mode in response to an estimated amount of time for a temperature of the evaporative emissions system to be within a threshold temperature of ambient temperature, where the estimated amount of time is based on Euler's number.

9. The vehicle system of claim 8 , where the estimated amount of time is determined via a cooling curve.

10. The vehicle system of claim 9 , further comprising additional instructions to return the controller to the sleep mode in response to ambient temperature increasing.

11. The vehicle system of claim 10 , further comprising additional instructions to estimate a second time for the temperature of the evaporative emissions system to be within the threshold temperature of ambient temperature in response to the ambient temperature increasing.

12. The vehicle system of claim 11 , further comprising additional instructions to wake the controller from the sleep mode in response to the second estimated amount of time.

13. The vehicle system of claim 12 , further comprising additional instructions to sense a temperature within a fuel tank of the evaporative emissions system.

14. The vehicle system of claim 8 , further comprising additional instructions to perform a diagnostic in response to waking the controller from the sleep mode.

15. A method for operating an evaporative emissions system, comprising:
estimating a time that a temperature at a location in an evaporative emissions system will be within a threshold temperature of ambient temperature, where the time is estimated from Euler's number;
waking a controller from a sleep mode at the estimated time; and
entering the controller to the sleep mode in response to the temperature at the location not being within the threshold temperature of ambient temperature.

16. The method of claim 15 , further comprising performing a diagnostic in response to the controller being within the threshold temperature of ambient temperature after waking the controller.

17. The method of claim 16 , where the diagnostic is a breach diagnostic.

18. The method of claim 16 , where the time is estimated from one of a plurality of evaporative emissions system cooling curves.

19. The method of claim 15 , further comprising selecting one of the plurality of evaporative emissions system cooling curves based on ambient temperature to estimate the time.

Assignees

• Ford Global Tech Llc

Inventors

• Jentz Robert
• Sharma Sanyam
• Carpenter Matthew
• Dudar Aed

Classifications

• F02D2200/70

  said parameters being related to the vehicle exterior · CPC title

• G06F1/3296

  by lowering the supply or operating voltage · CPC title

• G07C5/0808 Primary

  Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005) · CPC title

• F02D41/003

  Adding fuel vapours, e.g. drawn from engine fuel reservoir · CPC title

• F02M25/0809 Primary

  Judging failure of purge control system · CPC title