Tire condition advisory system

• US 9,056,532 B1
• Filed: 12/05/2013
• Issued: 06/16/2015
• Est. Priority Date: 12/05/2013
• Status: Expired due to Fees

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan North America Incorporated (Nissan Motor Co., Ltd.)
• Inventors: Kavarana, Farokh, Fritz, Scott, Zdeb, David, DeYoung, John
• Primary Examiner(s): Cheung, Mary
• Assistant Examiner(s): BRUSHABER, FREDERICK M
• Application Number:
  US14/097,634
• Publication Number:
  US 20150158345A1
• Time in Patent Office: 558 Days
• Field of Search: 701/33
• US Class Current: 1/1
• CPC Class Codes: B60C 23/00 Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
• CPC Class Codes: B60C 23/0401 characterised by the type of alarm
• 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: B60C 23/0484 Detecting an ongoing tyre inflation
• CPC Class Codes: G07C 5/08 Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
• CPC Class Codes: G07C 5/0825 using optical means

Abstract

A pressure detection device and a controller in communication with the device are used to implement a tire pressure optimization system for a vehicle. The pressure detection device detects a vehicle tire'"'"'s inflation pressure. The controller is programmed to identify the vehicle as being in a warning state when the inflation pressure is below a warning low pressure threshold, identify the vehicle as being in an optimum state when the inflation pressure is within an optimum pressure range where the vehicle will exhibit optimum performance, and identify the vehicle as being in an advisory state when the inflation pressure is within an advisory pressure range where the vehicle will exhibit an undesirable performance characteristic. The advisory pressure range is outside of the optimum pressure range and above the warning low pressure threshold.

Claims

1. A tire pressure optimization system for a vehicle, comprising:

a pressure detection device for detecting a first vehicle tire'"'"'s inflation pressure;

a second pressure detection device for detecting a second vehicle tire'"'"'s inflation pressure;

a display; and

a controller in communication with the first and second pressure detection devices and the display, the controller programmed to;

calculate a pressure differential between the first vehicle tire'"'"'s inflation pressure and the second vehicle tire'"'"'s inflation pressure;

identify an operating state of the vehicle as being;

in a warning state when the first vehicle tire'"'"'s inflation pressure is below a warning low pressure threshold,

in an optimum state when the first vehicle tire'"'"'s inflation pressure is within an optimum pressure range where the vehicle will exhibit optimum performance,

in an advisory state when the first vehicle tire'"'"'s inflation pressure is within an advisory pressure range where the vehicle will exhibit an undesirable performance characteristic, wherein the advisory pressure range is outside of the optimum pressure range and above the warning low pressure threshold, and

in the advisory state when the pressure differential is greater than an optimum pressure differential; and

operate the display to output an optimum state indication when the operating state is in the optimum state, a warning indication when the operating state is in the warning state, and an advisory indication when the operating state is in the advisory state.

2. The system of claim 1, wherein the optimum pressure range is defined by an optimum low pressure threshold that is higher than the warning low pressure threshold, and an optimum high pressure threshold.

3. The system of claim 2, wherein the controller is further programmed to:

identify the operating state of the vehicle as being in a second warning state when the first vehicle tire'"'"'s inflation pressure is above a warning high pressure threshold, wherein the advisory pressure range includes any inflation pressure that is between the warning low pressure threshold and the optimum low pressure threshold, and any inflation pressure that is between the warning high pressure threshold and the optimum high pressure threshold.

4. The system of claim 2, wherein the optimum low pressure threshold is approximately 5 psi below a placard inflation pressure, and the optimum high pressure threshold is approximately 5 psi above the placard inflation pressure.

5. The system of claim 1, wherein the advisory pressure range is defined as including any inflation pressure that is:

between an optimum low pressure threshold and the warning low pressure threshold,

above an optimum high pressure threshold, or

outside of the optimum pressure differential.

6. The system of claim 1, wherein the warning low pressure threshold is the higher of a pressure 25% below a placard inflation pressure and a minimum pressure for the tire specified by the NHTSA.

7. The system of claim 1, wherein the controller is further programmed to:

identify the undesirable performance characteristic based on the inflation pressure when the vehicle is identified as being in the advisory state.

8. The system of claim 7, wherein the identified undesirable performance characteristic is at least one of a ride characteristic, an efficiency characteristic or a tire wear characteristic.

9. A vehicle, comprising:

a first tire;

a pressure detection device for detecting the first tire'"'"'s inflation pressure;

a second tire;

a second pressure detection device for detecting the second vehicle tire'"'"'s inflation pressure;

a display; and

a controller in communication with the pressure detection devices and the display, the controller programmed to;

calculate a pressure differential between the first tire'"'"'s inflation pressure and the second tire'"'"'s inflation pressure;

identify an operating state of the vehicle as being;

in a warning state when the first tire'"'"'s inflation pressure is below a warning low pressure threshold,

in an optimum state when the first tire'"'"'s inflation pressure is within an optimum pressure range where the vehicle will exhibit optimum performance,

in an advisory state when the first tire'"'"'s inflation pressure is within an advisory pressure range where the vehicle will exhibit an undesirable performance characteristic, wherein the advisory pressure range is outside of the optimum pressure range and above the warning low pressure threshold, and

in the advisory state when the pressure differential is greater than an optimum pressure differential; and

operate the display to output an optimum state indication when the operating state is in the optimum state, a warning indication when the operating state is in the warning state, and an advisory indication when the operating state is in the advisory state.

10. The vehicle of claim 9, wherein the optimum pressure range is defined by an optimum low pressure threshold that is higher than the warning low pressure threshold, and an optimum high pressure threshold.

11. The vehicle of claim 10, wherein the controller is further programmed to:

identify the operating state of the vehicle as being in a second warning state when the first tire'"'"'s inflation pressure is above a warning high pressure threshold, wherein the advisory pressure range includes any inflation pressure that is between the warning low pressure threshold and the optimum low pressure threshold, and any inflation pressure that is between the warning high pressure threshold and the optimum high pressure threshold.

12. The vehicle of claim 10, wherein the optimum low pressure threshold is approximately 5 psi below a placard inflation pressure, and the optimum high pressure threshold is approximately 5 psi above the placard inflation pressure.

13. The vehicle of claim 9, wherein the advisory pressure range is defined as including any inflation pressure that is:

between an optimum low pressure threshold and the warning low pressure threshold,

above an optimum high pressure threshold, or

outside of the optimum pressure differential.

14. The vehicle of claim 9, wherein the warning low pressure threshold is the higher of a pressure 25% below a placard inflation pressure and a minimum pressure for the tire specified by the NHTSA.

15. The vehicle of claim 9, wherein the controller is further programmed to:

identify the undesirable performance characteristic based on the inflation pressure when the vehicle is identified as being in the advisory state.

16. The vehicle of claim 15, wherein the identified undesirable performance characteristic is at least one of a ride characteristic, an efficiency characteristic or a tire wear characteristic.

17. A vehicle, comprising:

a plurality of tires;

a plurality of devices, each associated with one of the plurality of tires for detecting the associated tires'"'"' inflation pressures;

a display; and

a controller in communication with the plurality of devices and the display, the controller programmed to;

calculate a pressure differential between a first inflation pressure of one of the plurality of tires and a second inflation pressure of another of the plurality of tires;

identify an operating state of the vehicle as being;

in a warning state when any of the inflation pressures are below a warning low pressure threshold or above a warning high pressure threshold,

in an optimum state when all of the inflation pressures are within an optimum pressure range where the vehicle will exhibit optimum performance, the optimum pressure range defined for each inflation pressure by an optimum low pressure threshold, an optimum high pressure threshold, and an optimum pressure differential from another vehicle tire'"'"'s inflation pressure, and

in an advisory state when any of the inflation pressures are within an advisory pressure range where the vehicle will exhibit an undesirable performance characteristic, the advisory pressure range for each inflation pressure defined as including any inflation pressure that is between the optimum low pressure threshold and the warning low pressure threshold, between the optimum high pressure threshold and the warning high pressure threshold, or outside of the optimum pressure differential from another vehicle tire'"'"'s inflation pressure; and

operate the display to output an optimum state indication when the operating state is in the optimum state, a warning indication when the operating state is in the warning state, and an advisory indication when the operating state is in the advisory state.

18. The vehicle of claim 17, wherein the controller is further programmed to identify the undesirable performance characteristic based on the inflation pressure when the vehicle is identified as being in the advisory state.