Rumble strip responsive systems: discrimination of types of rumble strips

• US 7,219,031 B2
• Filed: 03/31/2005
• Issued: 05/15/2007
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Technical Center North America Incorporated (Nissan Motor Co., Ltd.)
• Inventors: Tsuda, Hiroshi, Kawazoe, Hiroshi
• Primary Examiner(s): Tsai; Carol S. W.
• Application Number:
  US11/094,322
• Publication Number:
  US 20060229840A1
• Time in Patent Office: 775 Days
• Field of Search: 702/147, 702/47, 702/56, 701/301, 701/1, 701/45, 701/213, 340/425.5, 340/436, 340/438, 340/940, 340/933
• US Class Current: 702/147
• CPC Class Codes: B60W 2520/28 Wheel speed
• CPC Class Codes: B60W 2552/35 Road bumpiness, e.g. potholes
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 40/06 Road conditions

Abstract

There are basically two types of rumble strips: shoulder/center rumble strips and in-lane rumble strips. In an embodiment of the invention, there is a device that automatically identifies the type of rumble strip with which a vehicle tire is in contact with. The device may include a processor adapted to receive input indicative of a state of rotation of a first vehicle tire and input indicative of a state of rotation of a second vehicle tire when one or more of the first vehicle tire and the second vehicle tire is in contact with a rumble strip. The processor includes logic to compare the state of rotation of the first vehicle tire to the state of rotation of the second vehicle tire, and determine from the comparison, the type of rumble strip in contact with at least one of the first vehicle tire and the second vehicle tire.

Claims

1. A device adapted to automatically identify a type of rumble strip, comprising:

a processor adapted to receive at least a first signal indicative of at least a state of rotation of a first vehicle tire and second signal indicative of a state of rotation of a second vehicle tire, wherein at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip;

wherein the processor includes logic to;

compare the state of rotation of the first vehicle tire to the state of rotation of the second vehicle tire and determine from the comparison a type of rumble strip in contact with at least one of the first vehicle tire and the second vehicle tire.

2. The device of claim 1, wherein the processor further includes logic to:

analyze input indicative of contact of at least one vehicle tire with a rumble strip; and

determine from the analysis of the input whether the input is indicative of tire contact with the rumble strip.

3. The device of claim 2, wherein the input indicative of contact of at least one vehicle tire with a rumble strip includes input indicative of at least a state of rotation of a first vehicle tire and a state of rotation of a second vehicle tire.

4. The device of claim 2, wherein the first signal is indicative of at least one of a rotation speed and a change in rotation speed of the first vehicle tire, and wherein the second signal is indicative of at least one of a rotation speed and a change of rotation speed of the second vehicle tire, and wherein the processor further includes logic to at least one of:

i—

compare the rotation speed of the first vehicle tire to the rotation speed of the second vehicle tire and determine from the comparison a type of rumble strip in contact with at least one of the first vehicle tire and the second vehicle tire; and

ii—

compare the change in rotation speed of the first vehicle tire to the change in rotation speed of the second vehicle tire and determine from the comparison a type of rumble strip in contact with at least one of the first vehicle tire and the second vehicle tire;

wherein the processor includes logic to output data indicative of the determination of the type of rumble strip, and wherein the processor is adapted to output a signal indicative of the determination of the type of rumble strip.

5. The device of claim 4, wherein if the processor includes logic to execute “

i,”

the logic further includes logic to;

identify a plurality of first values corresponding to rotation speeds of the first vehicle tire and identify a plurality of second values corresponding to rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of first values; and

compare a substantial number of first values to respective second values during the comparison of “

i,” and

if a substantial number of the respective first values and second values are determined to be substantially different from each other, determine that the rumble strip is a shoulder/center rumble strip, and if a substantial number of the respective first values and second values are determined to be substantially similar to each other, determine that the rumble strip is an in-lane rumble strip; and

wherein if the processor includes logic to execute “

ii,”

the logic further includes logic to;

identify a plurality of third values corresponding to changes of rotation speeds of the first vehicle tire and identify a plurality of fourth values corresponding to changes of rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of third values; and

compare a substantial number of third values to respective fourth values during the comparison of “

ii,” and

if a substantial number of the respective third values and fourth values are determined to be substantially different from each other, determine that the rumble strip is a shoulder/center rumble strip, and if a substantial number of the respective third values and fourth values are determined to be substantially similar to each other, determine that the rumble strip is an in-lane rumble strip.

6. The device of claim 5, wherein the device is adapted so that the substantial number of first values and second values will not be cycle-coincidence values, and wherein the device is adapted so that the substantial number of third values and fourth values will not be cycle-coincidence values.

7. The device of claim 5, wherein the processor is further adapted to receive input indicative of whether the first and second vehicle tires are free-wheeling tires or driven tires, and wherein the processor further includes logic to:

determine that the input is indicative of free-wheeling first and second vehicle tires; and

only if the determination is made that the input is indicative of free-wheeling first and second vehicle tires, output the signal indicative of the determination of the type of rumble strip.

8. The device of claim 5, wherein the processor is further adapted to receive input indicative of whether the first and second vehicle tires are free-wheeling tires or driven tires, and wherein the processor further includes logic to:

determine that the input is indicative of driven first and second vehicle tires; and

only if the determination is made that the input is indicative of driven first and second vehicle tires, output the signal indicative of the determination of the type of rumble strip.

9. The device of claim 1, wherein the processor is adapted to receive input indicative of whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode, wherein the first signal is indicative of a rotation speed of the first vehicle tire, wherein the second signal is indicative of a rotation speed of the second vehicle tire, and wherein the processor includes logic to:

determine whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode;

identify a substantial number of first values corresponding to rotation speeds of the first vehicle tire and identify a substantial number of second values corresponding to rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of first values;

compare a substantial number of first values to respective second values and determine whether a substantial number of respective first values and second values are substantially different from each other; and

if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in a free-wheel mode, and if a determination is made that a substantial number of respective first values and second values are substantially different from each other, determine that the rumble strip is a shoulder/center rumble strip and output a signal indicative of a determination that the rumble strip is a shoulder/center rumble strip.

10. The device of claim 9, wherein the processor includes logic to:

if a determination is made that at least one of the first vehicle wheel and the second vehicle wheel is in a free-wheel mode, and if a determination is made that a substantial number of respective first values and second values are substantially similar to each other, determine that the rumble strip is an in-lane rumble strip and output a signal indicative of a determination that the rumble strip is an in-lane rumble strip.

11. The device of claim 9, wherein the processor includes logic to:

determine that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip if a substantial number of at least one of (i) the first values and (ii) the second values vary in an oscillatory manner over a predetermined time period when an RPM of a vehicle engine is substantially constant, and output a signal indicative of a determination that a rumble strip is in contact with at least one of the first vehicle tire and the second vehicle tire.

12. The device of claim 1, wherein the processor is adapted to receive input indicative of whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode, wherein the first signal is indicative of a rotation speed of the first vehicle tire, wherein the second signal is indicative of a rotation speed of the second vehicle tire, and wherein the processor includes logic to:

determine whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode;

identify a substantial number of first values corresponding to rotation speeds of the first vehicle tire and identify a substantial number of second values corresponding to rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of first values;

compare a substantial number of first values to respective second values and determine whether a substantial number of respective first values and second values are substantially different from each other; and

compare a substantial number of second values to each other and determine whether a substantial number of the second values are substantially similar to each other; and

if a determination is made that at least one of the first vehicle wheel and the second vehicle wheel is in a free-wheel mode, if a determination is made that a substantial number of the second values are substantially similar to each other, and if a determination is made that a substantial number of respective first values and second values are substantially different from each other, determine that the rumble strip is a shoulder/center rumble strip and output a signal indicative of a determination that the rumble strip is a shoulder/center rumble strip.

13. The device of claim 12, wherein the processor includes logic to:

if a determination is made that at least one of the first vehicle wheel and the second vehicle wheel is in a free-wheel mode, if a determination is made that a substantial number of the second values are substantially similar to each other, and if a determination is made that a substantial number of respective first values and second values are substantially similar to each other, determine that the rumble strip is an in-lane rumble strip and output a signal indicative of a determination that the rumble strip is an in-lane rumble strip.

14. The device of claim 9, wherein the processor includes logic to:

determine that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip if a substantial number of at least one of the first values and the second values vary in an oscillatory manner over a predetermined time period when an rpm of a vehicle engine is substantially constant, and output a signal indicative of a determination that a rumble strip is in contact with at least one of the first vehicle tire and the second vehicle tire.

15. The device of claim 1, wherein the processor is adapted to receive input indicative of whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode, wherein the first signal is indicative of a rotation speed of the first vehicle tire, wherein the second signal is indicative of a rotation speed of the second vehicle tire, and wherein the processor includes logic to:

determine whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode;

identify a first pattern corresponding to rotation speeds of the first vehicle tire over a first predetermined period and identify a second pattern corresponding to rotation speeds of the second vehicle tire over the first predetermined period,

compare the first pattern to the second pattern with respect to phase and determine whether the first pattern is substantially different in phase from the second pattern; and

if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in a driven mode, and if a determination is made that the first pattern is substantially different in phase from the second pattern, determine that the rumble strip is a shoulder/center rumble strip and output a signal indicative of a determination that the rumble strip is a shoulder/center rumble strip.

16. The device of claim 15, wherein the processor includes logic to:

if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in a driven mode, and if a determination is made that the first pattern is substantially similar to the second pattern in phase, determine that the rumble strip is an in-lane rumble strip and output a signal indicative of a determination that the rumble strip is an in-lane rumble strip.

17. The device of claim 12, wherein the processor includes logic to:

determine that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip if a substantial number of at least one of the first values and the second values vary in an oscillatory manner over a predetermined time period when an rpm of a vehicle engine is substantially constant during that predetermined time period, and output a signal indicative of a determination that a rumble strip is in contact with at least one of the first vehicle tire and the second vehicle tire.

24. A vehicle, comprising:

a chassis; and

a device according to claim 1.

25. A device according to claim 1, wherein the processor includes logic to compare a first pattern corresponding to rotation speeds of the first vehicle tire over a first predetermined period to a pattern of rotation speeds of the second vehicle tire over the first predetermined period, and if a determination is made that the first pattern is substantially different in phase from the second pattern, output a signal indicative of a determination that the rumble strip is a shoulder/center rumble strip.

26. A device according to claim 1, wherein the processor is adapted to identify a first pattern corresponding to rotation speeds of the first vehicle tire over a first predetermined period and identify a second pattern corresponding to rotation speeds of the second vehicle tire over the first predetermined period;

wherein the processor includes logic to;

compare the first pattern to the second pattern with respect to phase and determine whether the first pattern is substantially different in phase from the second pattern; and

if a determination is made that the first pattern is substantially different in phase from the second pattern, determine that the rumble strip is a shoulder/center rumble strip and output a signal indicative of a determination that the rumble strip is a shoulder/center rumble strip.

18. A device adapted to automatically identify a type of rumble strip, comprising:

a processor adapted to receive at least a first signal indicative of a rotation speed of a first vehicle tire and a second signal indicative of a rotation speed of a second vehicle tire, and to receive input indicative of whether at least one of the first vehicle tire and the second vehicle tire is in free-wheel mode or in driven mode, wherein at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip;

wherein the processor includes logic to;

identify a substantial number of first values corresponding to rotation speeds of the first vehicle tire and identify a substantial number of second values corresponding to rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of first values;

identify a substantial number of third values which are equivalent to adding first values and respective second values;

determine whether a substantial number of third values fall outside a predetermined threshold range;

if a substantial number of third values fall outside the predetermined range, and if input has been received indicative of at least one of the first vehicle tire and the second vehicle tire are in a driven mode, output a signal indicative of a determination that at least one of the first and second vehicle tires are in contact with in-lane rumble strips;

if a substantial number of third values fall inside the predetermined range, and if input has been received indicative of at least one of the first vehicle tire and the second vehicle tire are in a driven mode, output a signal indicative of a determination that at least one of the first and second vehicle tires are in contact with shoulder/center rumble strips.

19. A device adapted to automatically identify a type of rumble strip, comprising:

a processor adapted to receive at least a first signal indicative of a rotation speed of the first vehicle tire and second signal indicative of a rotation speed of a second vehicle tire, wherein at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip;

wherein the processor includes logic to;

determine whether at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip based on at least one of (i) the first signal, (ii) the second signal, and (iii) additional input;

identify a substantial number of first values corresponding to rotation speeds of the first vehicle tire and identify a substantial number of second values corresponding to rotation speeds of the second vehicle tire substantially respectively corresponding temporally to the plurality of first values;

identify a first pattern of first values over a predetermined period of time and identify a second pattern of second values temporally respective to the first values over the predetermined period of time;

determine whether the first pattern is substantially similar to the second pattern, and if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip and if a determination is made that the first pattern is substantially similar to the second pattern, output a signal indicative of a determination that at least one of the first and second vehicle tires are in contact with in-lane rumble strips.

20. The device of claim 19, wherein the processor further includes logic to:

if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip and if a determination is made that the first pattern is substantially different to the second pattern, output a signal indicative of a determination that at least one of the first and second vehicle tires are in contact with shoulder/center rumble strips.

21. The device of claim 19, wherein the processor further includes logic to:

identify an amplitude of the first pattern and an amplitude of the second pattern;

determine whether the amplitude of the first pattern is substantially similar to the amplitude of the second pattern, and if a determination is made that at least one of the first vehicle tire and the second vehicle tire is in contact with a rumble strip, and if a determination is made that the amplitude of the first pattern is substantially similar to the amplitude of the second pattern, and if no determination is made that the first pattern is substantially similar to the second pattern, output a signal indicative of a determination that at least one of the first and second vehicle tires are in contact with shoulder/center rumble strips.

22. The device of claim 21, wherein the processor further comprises logic to:

determine at least one of;

(i) which of the first vehicle tire and the second vehicle tire is in contact with a rumble strip; and

(ii) which of the first vehicle tire and the second vehicle tire is not in contact with a rumble strip.

23. The device of claim 21, wherein the processor further comprises logic to:

determine at least one of;

(i) which of the first vehicle tire and the second vehicle tire is in contact with a rumble strip based on the amplitude of at least one of the first pattern and the second pattern; and

(ii) which of the first vehicle tire and the second vehicle tire is not in contact with a rumble strip based on the amplitude of at least one of the first pattern and the second pattern.