Stability enhancing system and method for enhancing the stability of a vehicle

• US 8,498,773 B2
• Filed: 05/20/2010
• Issued: 07/30/2013
• Est. Priority Date: 05/20/2010
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Marur, Prabhakar R., Namuduri, Chandra S.
• Primary Examiner(s): Shaawat, Mussa A
• Application Number:
  US12/784,316
• Publication Number:
  US 20110288716A1
• Time in Patent Office: 1,167 Days
• Field of Search: None
• US Class Current: 701/31.4
• CPC Class Codes: B60G 17/021 the mechanical spring being a coil spring B60G17/0272 takes precedence
• CPC Class Codes: B60G 2800/9124 Roll-over protection systems, e.g. for warning or control

Abstract

A stability enhancing system for a vehicle having a suspension system including a spring is disclosed herein. The stability enhancing system includes, but is not limited to, a processor that is mounted on the vehicle. A sensor is mounted on the vehicle and is communicatively coupled to the processor. The sensor is configured to detect a dynamic condition of the vehicle. A locking mechanism is connected to the spring and is communicatively coupled to the processor. The locking mechanism is configured to inhibit the spring from releasing a stored energy when the locking mechanism is locked. The processor is configured to obtain the dynamic condition from the sensor, to utilize the dynamic condition to determine whether a wheel lift event will occur, and to provide commands to the locking mechanism to lock if the processor determines that a wheel lift event will occur.

Claims

1. A stability enhancing system for a vehicle having a suspension system including a spring, the stability enhancing system comprising:

a processor mounted on the vehicle;

a sensor mounted on the vehicle and communicatively coupled to the processor, the sensor configured to detect a dynamic condition of the vehicle;

a locking mechanism having an upper portion and a lower portion each directly connected to the spring and communicatively coupled to the processor, the locking mechanism being configured to inhibit the spring from releasing a stored energy when the locking mechanism is locked,

wherein the processor is configured to obtain the dynamic condition from the sensor, to utilize the dynamic condition to determine whether a wheel lift event will occur, and to provide a lock command to the locking mechanism if the processor determines that the wheel lift event will occur.

2. The stability enhancing system of claim 1, wherein the locking mechanism comprises a magneto rheological fluid lock.

3. The stability enhancing system of claim 1, wherein the locking mechanism comprises an electro-hydraulic lock.

4. The stability enhancing system of claim 1, wherein the vehicle comprises a plurality of wheels, the suspension system comprising a corresponding plurality of the springs, wherein each wheel is associated with one of the springs, the stability enhancing system further comprising a plurality of the locking mechanisms, wherein each of the locking mechanisms is connected to a respective one of the springs such that each of the wheels is associated with one of the locking mechanisms.

5. The stability enhancing system of claim 4, wherein the processor is further configured to provide the lock command to a subset of the plurality of the locking mechanisms prior to the wheel lift event if the processor determines that the wheel lift event will occur, the subset consisting of each of the locking mechanisms that is associated with a trailing wheel.

6. The stability enhancing system of claim 1, wherein the sensor comprises a three-axis accelerometer.

7. The stability enhancing system of claim 1, wherein the sensor comprises a roll angle sensor.

8. The stability enhancing system of claim 1, wherein the locking mechanism is further configured to permit the spring to release the stored energy when the locking mechanism is unlocked, and wherein the processor is further configured to provide an unlock command to the locking mechanism if the processor determines that such release of the stored energy will not cause the wheel lift event.

9. The stability enhancing system of claim 1, wherein the spring is a compression spring and wherein the locking mechanism is configured to obstruct expansion of the spring when the locking mechanism is locked.

10. A stability enhancing system for a vehicle having a suspension system including a spring, the stability enhancing system comprising:

a processor mounted on the vehicle;

a sensor mounted on the vehicle and communicatively coupled to the processor, the sensor configured to detect a dynamic condition of the vehicle;

a data storage unit communicatively coupled to the processor, the data storage unit configured to store data relating a wheel-lift-threshold dynamic condition;

a locking mechanism having an upper portion and a lower portion each directly connected to the spring and communicatively coupled to the processor, the locking mechanism being configured to inhibit the spring from releasing a stored energy when the locking mechanism is locked,

wherein the processor is configured to obtain the dynamic condition from the sensor, to obtain the wheel-lift-threshold dynamic condition from the data storage unit, to compare the dynamic condition with the wheel-lift-threshold dynamic condition, and to provide a command to the locking mechanism to lock when the processor determines that the dynamic condition is greater than the wheel-lift-threshold dynamic condition.

11. The stability enhancing system of claim 10, wherein the locking mechanism comprises a magneto rheological fluid lock.

12. The stability enhancing system of claim 10, wherein the locking mechanism comprises an electro-hydraulic lock.

13. The stability enhancing system of claim 10, wherein the vehicle comprises a plurality of wheels, the suspension system comprising a corresponding plurality of the springs, wherein each wheel is associated with one of the springs, the stability enhancing system further comprising a plurality of the locking mechanisms, wherein each of the locking mechanisms is connected to a respective one of the springs such that each wheel is associated one of the locking mechanisms.

14. The stability enhancing system of claim 13, wherein the processor is further configured to provide the command to a subset of the plurality of the locking mechanisms to lock prior to a wheel lift event if the processor determines that the wheel lift event will occur, the subset consisting of each of the locking mechanisms that is associated with a trailing wheel.

15. The stability enhancing system of claim 10, wherein the sensor comprises a three-axis accelerometer.

16. The stability enhancing system of claim 10, wherein the sensor comprises a roll angle sensor.

17. The stability enhancing system of claim 10, wherein the locking mechanism is further configured to permit the spring to release the stored energy when the locking mechanism is unlocked, and wherein the processor is further configured to provide an unlock command to the locking mechanism when the processor determines that the dynamic condition has diminished to less than the wheel-lift-threshold dynamic condition.

18. The stability enhancing system of claim 10, wherein the spring is a compression spring and wherein the locking mechanism is configured to obstruct expansion of the spring when the locking mechanism is locked.

19. A method for enhancing the stability of a vehicle having a suspension system including a spring, the method comprising:

detecting a dynamic condition of the vehicle with a sensor;

determining if the dynamic condition will cause an occurrence of a wheel lift event with a processor; and

directly inhibiting the spring from releasing a stored energy with a locking mechanism having an upper portion and a lower portion each directly connected to the spring if it is determined that the wheel lift event will occur.

20. The method of claim 19, further comprising:

permitting the spring to release the stored energy when it is determined that the wheel lift event has been prevented.