System and method for tire cornering power estimation and monitoring

• US 8,290,662 B2
• Filed: 04/25/2008
• Issued: 10/16/2012
• Est. Priority Date: 04/25/2008
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Wang, Dexin, Basch, Rena Hecht
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Khatib, Rami
• Application Number:
  US12/109,482
• Publication Number:
  US 20090271061A1
• Time in Patent Office: 1,635 Days
• Field of Search: 701/29, 701/36, 701/72, 731/46, 731/462, 340/442, 702182-183
• US Class Current: 701/36
• CPC Class Codes: G01M 17/06 Steering behaviour; Rolling behaviour

Abstract

A tire cornering power estimation and monitoring system, comprising a steering torque sensor, a steering wheel angle sensor, a yaw rate sensor, a lateral acceleration sensor, a speed sensor, and at least one controller configured to receive signals from the sensors and send a notification if the signals indicate that one or more of the vehicle'"'"'s tires need to be checked or serviced. The system also comprises a notification system configured to indicate that one or more of the vehicle'"'"'s tires need to be checked or serviced.

Claims

1. A method for estimating and monitoring tire cornering power in a vehicle, comprising:

receiving signals corresponding to a steering torque, a steering wheel angle, a yaw rate, a lateral acceleration, and a vehicle speed from a steering torque sensor, a steering wheel angle sensor, a yaw rate sensor, a lateral acceleration sensor and a speed sensor, respectively; and

sending a notification to indicate that one or more of the vehicle'"'"'s tires need to be checked or serviced when a tire corner stiffness deviation exceeds a specified value, the tire corner stiffness deviation representing a comparison of a calculated vehicle front effective aligning stiffness with a reference vehicle front effective aligning stiffness, the calculated vehicle front effective aligning stiffness being calculated based on

the signal corresponding to the steering torque,

an estimated road friction,

an estimated vehicle front weight, and

at least one of the signals corresponding to the steering wheel angle, the yaw rate, the lateral acceleration and the vehicle speed.

2. The method of claim 1, wherein the vehicle front effective aligning stiffness is based on a front total steering moment indicative of the signal received from the steering torque sensor.

3. The method of claim 2, wherein the determining the vehicle front effective aligning stiffness includes determining a front tire slip angle based on the signals received from the steering wheel angle sensor, the yaw rate sensor, the lateral acceleration sensor, and the vehicle speed sensor.

4. The method of claim 3, wherein the vehicle front effective aligning stiffness is based on the front total steering moment and the front tire slip angle.

5. The method of claim 4, wherein the vehicle front effective aligning stiffness is based on a ratio of the front total steering moment to the front tire slip angle.

6. The method of claim 1, further comprising dynamically updating the reference front aligning stiffness based on vehicle conditions.

7. The method of claim 6, wherein sending a notification comprises providing feedback to a vehicle driver when the tire cornering stiffness deviation exceeds the specified value.

8. The method of claim 7, wherein the feedback to the vehicle driver is current tire physical condition feedback.

9. The method of claim 1, wherein the calculated vehicle front effective aligning stiffness is calculated based on tire model values obtained by inputting the estimated road friction and the estimated vehicle front weight into a tire model.