BAROMETRIC PRESSURE INFERENCE BASED ON TIRE PRESSURE

• US 20150032357A1
• Filed: 07/25/2013
• Published: 01/29/2015
• Est. Priority Date: 07/25/2013
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Dudar, Aed M.
• Granted Patent: US 9,261,432 B2
• Time in Patent Office: Days
• US Class Current: 701/103
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 2200/704 Estimation of atmospheric pressure
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/222 relating to the failure of sensors or parameter detection devices
• CPC Class Codes: F02M 25/0809 Judging failure of purge control system
• CPC Class Codes: F02P 5/1502 using one central computing unit
• CPC Class Codes: G01M 15/09 by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

Methods and systems for detecting barometric pressure (BP) changes based on tire pressure changes are disclosed. In one example approach, a method comprises adjusting an evaporative leak detection threshold based on a change in barometric pressure, where the change in barometric pressure is based on a tire pressure change.

Claims

1. A method for a vehicle with an engine, comprising:

adjusting an evaporative leak detection threshold based on a change in barometric pressure, the change in barometric pressure based on a tire pressure change.

2. The method of claim 1, wherein adjusting the evaporative leak detection threshold includes decreasing the evaporative leak detection threshold in response to an increase in tire pressure, the method further comprising generating an indication of a leak based on a comparison of a parameter with the evaporative leak detection threshold.

3. The method of claim 1, wherein adjusting the evaporative leak detection threshold includes increasing the evaporative leak detection threshold in response to a decrease in tire pressure.

4. The method of claim 1, wherein the tire pressure change is determined via one or more tire pressure sensors.

5. The method of claim 1, further comprising, adjusting an air/fuel ratio measurement in the engine responsive to the change in barometric pressure based on the tire pressure change.

6. The method of claim 1, further comprising indicating an altitude change based on a tire pressure change.

7. The method of claim 6, wherein indicating an altitude change based on a tire pressure change includes indicating an increase in altitude in response to an increase in tire pressure.

8. The method of claim 6, wherein indicating an altitude change based on a tire pressure change includes indicating a decrease in altitude in response to a decrease in tire pressure.

9. The method of claim 6, further comprising discontinuing an evaporative leak detection monitor in response to a change in altitude is greater than a threshold change, where the change in altitude is based on a tire pressure change.

10. The method of claim 1, further comprising discontinuing an evaporative leak detection monitor in response to a change in tire pressure greater than a threshold.

11. The method of claim 1, wherein adjusting an evaporative leak detection threshold based on a change in barometric pressure where the change in barometric pressure is based on a tire pressure change is performed in response to fault conditions of a barometric pressure sensor coupled to the engine.

12. The method of claim 11, wherein the fault conditions include closed throttle engine operating conditions.

13. A method for a vehicle with an engine, comprising:

adjusting engine operation responsive to a change in barometric pressure, the change in barometric pressure based on a tire pressure change determined via one or more tire pressure sensors.

14. The method of claim 13, wherein adjusting engine operation includes adjusting engine spark timing and engine air-fuel ratio.

15. The method of claim 13, wherein adjusting engine operation includes adjusting an evaporative leak detection threshold based on the change in barometric pressure.

16. The method of claim 13, further comprising indicating an altitude change based on a tire pressure change and adjusting engine operation based on the indicated altitude change.

17. The method of claim 13, further comprising discontinuing an evaporative leak detection monitor in response to a change in tire pressure greater than a threshold.

18. The method of claim 13, further comprising:

in response to an engine intake throttle position greater than a threshold, adjusting engine operation responsive to a change in barometric pressure, where the change in barometric pressure is based on a barometric pressure sensor coupled to an intake of the engine; and

in response to the engine intake throttle position less than the threshold, adjusting engine operation responsive to a change in barometric pressure, where the change in barometric pressure is based on a tire pressure change determined via one or more tire pressure sensors.

19. A vehicle system, comprising:

an engine;

a barometric pressure sensor in an intake of the engine;

one or more tire pressure sensors coupled to one or more tires of the vehicle;

an intake throttle in the intake of the engine;

a controller having instruction executable to;

in response to an opening amount of the intake throttle greater than a threshold while the engine is in operation, adjust engine operation responsive to a change in barometric pressure, where the change in barometric pressure is determined via the barometric pressure sensor; and

in response to an opening amount of the intake throttle less than the threshold while the engine is in operation, adjust engine operation responsive to a change in barometric pressure, where the change in barometric pressure is determined via the one or more tire pressure sensors coupled to one or more tires of the vehicle.

20. The system of claim 19, wherein adjusting engine operation includes adjusting one or more of an engine spark timing, an engine air-fuel ratio, and an evaporative leak detection threshold.