Bicycles with electronic shifting systems and methods

• US 8,886,417 B2
• Filed: 09/09/2011
• Issued: 11/11/2014
• Est. Priority Date: 09/09/2011
• Status: Active Grant

• Current Assignee: SRAM LLC (SRAM International Corp.)
• Original Assignee: SRAM LLC (SRAM International Corp.)
• Inventors: Jordan, Brian
• Primary Examiner(s): Chambers, Troy
• Assistant Examiner(s): PRATHER, GREGORY T
• Application Number:
  US13/228,588
• Publication Number:
  US 20130061705A1
• Time in Patent Office: 1,159 Days
• Field of Search: 744/731.3, 744/731.2, 280/260, 280/236, 280/238, 280/261, 200/61.88, 701/51, 701/52, 701/53, 701/58
• US Class Current: 701/51
• CPC Class Codes: B62J 45/20 Cycle computers as cycle accessories
• CPC Class Codes: B62J 45/41 characterised by the type of sensor
• CPC Class Codes: B62K 23/02 hand actuated arrangements of controls on handle-bars of engine-driven cycles B62K11/14
• CPC Class Codes: B62K 23/06 Levers
• CPC Class Codes: B62L 3/02 for control by a hand lever hand levers for control of cycles in general B62K23/06
• CPC Class Codes: B62M 25/08 with electrical or fluid transmitting systems
• CPC Class Codes: B62M 9/122 electrically or fluid actuated; Controls thereof
• CPC Class Codes: B62M 9/132 electrically or fluid actuated; Controls thereof
• CPC Class Codes: F16H 59/044 consisting of electrical switches or sensors range selectors with electric switches or sensors F16H59/105
• CPC Class Codes: Y10T 74/20037 Occupant propelled vehicle

Abstract

Electronic shifting systems, mechanisms and methods of using the systems to operate a bicycle that allows front and rear gear changer mechanisms to be controlled with only two switches. The switches can be arranged so that each hand is only required to operate one switch to shift the bicycle.

Claims

1. An electronic shifting system for a bicycle, comprising:

a first switch mechanism;

a second switch mechanism;

a control unit in communication with and responsive to signals from the first and second switch mechanisms;

a rear gear shift mechanism in communication with and responsive to command signals from the control unit, wherein actuating only the first switch mechanism sends a first signal to the control unit which is configured, in response to the first signal, to send a first command signal to perform only a rear gear shift mechanism upshift, and wherein actuating only the second switch mechanism sends a second signal to the control unit which is configured, in response to the second signal, to send a second command signal to perform only a rear gear shift mechanism downshift; and

a front gear shift mechanism in communication with and responsive to the command signals from the control unit, wherein the control unit is configured to determine when both the first switch mechanism and the second switch mechanism are actuated concurrently and responsively sends a front shift command signal to perform only a front gear shift operation.

2. The electronic shifting system of claim 1, further comprising a front gear position sensor for sensing a gear position of the front gear shift mechanism and wherein the control unit is configured to send the front shift command signal to move the front gear shift mechanism a direction depending on the sensed gear position.

3. The electronic shifting system of claim 1, wherein the front gear shift mechanism includes two gear positions.

4. The electronic shifting system of claim 1, wherein the front gear shift mechanism includes three gear positions.

37. The electronic shifting system of claim 1, wherein the rear gear shift mechanism upshift is performed responsive to the first command signal by the rear gear shift mechanism if 1) before expiration of a predetermined time period the second switch mechanism is not actuated and the first switch mechanism is released or 2) the predetermined time period expires and the second switch mechanism is not actuated;

wherein the rear gear shift mechanism downshift is performed responsive to the second command signal by the rear gear shift mechanism if

     1) before expiration of the predetermined time period the first switch mechanism is not actuated and the second switch mechanism is released or

     2) the predetermined time period expires and the first switch mechanism is not actuated; and

wherein the front gear shift operation is performed by the front gear shift mechanism if both the first and second switch mechanisms are actuated concurrently before expiration of the predetermined time period.

5. A method of shifting a bicycle with an electronic gear shifting system, wherein the electronic gear shifting system includes a first switch mechanism, a second switch mechanism, a control unit in communication with and responsive to signals from the first and second switch mechanisms, a front gear shift mechanism and a rear gear shift mechanism, the front and rear gear shift mechanisms in communication with and responsive to command signals from the control unit, comprising the steps of:

actuating only the first switch mechanism to perform only a rear gear shift mechanism upshift with the rear gear shift mechanism;

actuating only the second switch mechanism to perform only a rear gear shift mechanism downshift with the rear gear shift mechanism; and

actuating both the first and second switch mechanisms concurrently to cause the front gear shift mechanism to perform only a front gear shift operation.

6. The method of shifting a bicycle with an electronic gear shifting system of claim 5, wherein the front gear shift mechanism performs the front gear shift operation between two gear positions.

7. The method of shifting a bicycle with an electronic gear shifting system of claim 5, wherein the front gear shift mechanism performs the front gear shift operation between three gear positions.

8. The method of shifting a bicycle with an electronic gear shifting system of claim 5, wherein said actuating the second switch mechanism to perform a downshift step is permitted by the control unit if the rear gear shift mechanism is not in a first end position.

9. The method of shifting a bicycle with an electronic gear shifting system of claim 5, wherein said actuating the first switch mechanism to perform an upshift step is permitted by the control unit if the rear gear shift mechanism is not in a second end position.

38. The method of shifting a bicycle with an electronic gear shifting system of claim 5, wherein the rear gear shift mechanism upshift is performed with the rear gear shift mechanism if 1) before expiration of a predetermined time period the second switch mechanism is not actuated and the first switch mechanism is released or 2) the predetermined time period expires and the second switch mechanism is not actuated;

wherein the rear gear shift mechanism downshift is performed with the rear gear shift mechanism if

     1) before expiration of the predetermined time period the first switch mechanism is not actuated and the second switch mechanism is released or

     2) the predetermined time period expires and the first switch mechanism is not actuated; and

when both the first and second switch mechanisms are actuated concurrently before expiration of the predetermined time period the front gear shift mechanism perform the front gear shift operation.

10. A method of shifting a bicycle with an electronic gear shifting system, wherein the electronic gear shifting system includes a first switch mechanism, a second switch mechanism, a control unit in operative communication with and responsive to signals from the first and second switch mechanisms, and a front gear shift mechanism in operative communication with and responsive to command signals from the control unit, comprising:

monitoring with the control unit if one of the first and second switch mechanisms is actuated;

sensing when one of the first and second switch mechanisms is actuated;

determining if the other of the first and second switch mechanisms is actuated if the one of the first and second switch mechanisms is actuated;

generating a front shift command signal with the control unit if the first and second switches are determined to be actuated concurrently; and

performing only a front gear shift operation with the front gear shift mechanism responsive to the front shift command signal,

wherein the electronic gear shifting system further includes a rear gear shift mechanism in operative communication with and responsive to command signals from the control unit, further including;

determining which of the first and second switches is actuated if it is determined that only one of the first and second switches is actuated;

generating a rear shift command signal with the control unit indicative of said determining of which of the first and second switches is actuated; and

performing only one of a rear gear shift mechanism upshift operation or a rear gear shift mechanism downshift operation with the rear gear shift mechanism according to the rear shift command signal.

11. The method of shifting a bicycle of claim 10, including performing a rear gear shift mechanism upshift operation if the first switch is actuated.

12. The method of shifting a bicycle of claim 11, including:

determining if the rear gear shift mechanism is in a last position when the first switch is actuated; and

not generating a rear shift command signal if the rear gear shift mechanism is in the last position or generating a rear shift command signal and performing the rear gear shift mechanism upshift operation with the rear gear shift mechanism if the rear gear shift mechanism is not in the last position.

13. The method of shifting a bicycle of claim 10, including performing a rear gear shift mechanism downshift operation if the second switch is actuated.

14. The method of shifting a bicycle of claim 13, including:

determining if the rear gear shift mechanism is in a first position when the second switch is actuated; and

not generating a rear shift command signal if the rear gear shift mechanism is in the first position or generating a rear shift command signal and performing the rear gear shift mechanism downshift operation with the rear gear shift mechanism if the rear gear shift mechanism is not in the first position.

15. The method of shifting a bicycle of claim 10, including generating the rear shift command signal after the one of the first and second switches is actuated and then is non-actuated before the other of the first and second switches is actuated.

16. The method of shifting a bicycle of claim 10, including generating the rear shift command signal after a predetermined amount of time passes.

17. The method of shifting a bicycle of claim 10, wherein the control unit is distributed among components of the electronic gear shifting system.

18. The method of shifting a bicycle of claim 10, wherein the control unit is not distributed among components of the electronic gear shifting system.

39. The method of shifting a bicycle of claim 10, wherein the rear gear shift mechanism upshift operation or the rear gear shift mechanism downshift operation is performed if 1) before expiration of the predetermined time period the other of the first and second switch mechanisms is not actuated and the one of the first and second switch mechanisms is released or 2) the predetermined time period expires and the one of the first and second switch mechanism is not actuated.

19. A method of shifting a bicycle with an electronic gear shifting system, wherein the electronic gear shifting system includes a first switch mechanism and a second switch mechanism, a control unit in operative communication with and responsive to the first and second switch mechanisms, and a front gear shift mechanism and a rear gear shift mechanism in operative communication with and responsive to command signals from the control unit, comprising:

determining with the control unit if only a single one of the first and second switch mechanisms is actuated;

determining which of the single one of the first and second switch mechanism is actuated;

performing one of a rear gear shift mechanism downshift operation or a rear gear shift mechanism upshift operation with the rear gear shift mechanism dependent upon which one of the first and second switch mechanisms is determined to be actuated; and

performing a front gear shift operation if the other of the first and second switch mechanisms is actuated concurrently with the one of the first and second switch mechanisms before a predetermined amount of time has elapsed.

20. The method of shifting a bicycle of claim 19, including performing the rear gear shift mechanism downshift operation or the rear gear shift mechanism upshift operation after a predetermined amount of time has elapsed.

21. The method of shifting a bicycle of claim 20, including performing the rear gear shift mechanism downshift operation or the rear gear shift mechanism upshift operation if the state of the first and second switch mechanisms is unchanged after the predetermined amount of time has elapsed.

22. The method of shifting a bicycle of claim 19, including performing the rear gear shift mechanism downshift operation or the rear gear shift mechanism upshift operation before a predetermined amount of time has elapsed if the single one of the first and second switch mechanisms is actuated and then non-actuated before the predetermined amount of time has elapsed.

23. The method of shifting a bicycle of claim 19, wherein the control unit is distributed among components of the electronic gear shifting system.

24. The method of shifting a bicycle of claim 19, wherein the control unit is not distributed among components of the electronic gear shifting system.

25. A method of shifting a bicycle with an electronic gear shifting system, wherein the electronic gear shifting system includes a first switch mechanism and a second switch mechanism, a control unit in operative communication with and responsive to the first and second switch mechanisms, and a front gear shift mechanism and a rear gear shift mechanism in operative communication with and responsive to command signals from the control unit, comprising:

reading a state of each of the first and second switch mechanisms with the control unit;

determining if either of the first and second switch mechanisms has changed from a non-actuated state since said reading step;

performing a front gear shift operation if both the first and second switch mechanisms have changed to an actuated state;

storing a rear shift value in the control unit indicative of the state of the first and second switch mechanisms if only one of the first and second switch mechanisms has changed to an actuated state;

rereading the state of each of the first and second switch mechanisms with the control unit;

generating a rear shift command based on the rear shift value after a predetermined amount of time has elapsed if the state of the first and second switch mechanisms has not changed since said storing of the rear shift value; and

performing a rear gear shift operation based on the rear shift command.

26. The method of shifting a bicycle of claim 25, including storing the state of both of the first and second switch mechanisms after each said reading step.

27. The method of shifting a bicycle of claim 25, wherein said storing includes assigning one of an upshift, a downshift, or a null shift value.

28. The method of shifting a bicycle of claim 25, including resetting the shift value to null if the first and the second switch mechanisms are determined to be non-actuated after said performing the front gear shift operation.

29. The method of shifting a bicycle of claim 25, including resetting the shift value to null if the first and second switch mechanisms are determined to be non-actuated after said performing the rear gear shift operation.

30. The method of shifting a bicycle of claim 25, including resetting the shift value to null if said rereading step determines that the first and the second switch mechanisms are non-actuated.

31. The method of shifting a bicycle of claim 25, wherein if the one of the first and second switch mechanisms is still actuated after said performing the rear gear shift operation, rereading the state of both of the first and second switches and performing a front gear shift operation if both of the switches are determined to be actuated.

32. The method of shifting a bicycle of claim 25, wherein the control unit is distributed among components of the electronic gear shifting system.

33. The method of shifting a bicycle of claim 25, wherein the control unit is not distributed among components of the electronic gear shifting system.

34. A method of shifting a bicycle with an electronic gear shifting system, wherein the electronic gear shifting system includes a first switch mechanism and a second switch mechanism, a control unit in operative communication with and responsive to the first and second switch mechanisms, and a front gear shift mechanism and a rear gear shift mechanism in operative communication with and responsive to command signals from the control unit, comprising:

reading and storing a state of the first and second switch mechanisms with the control unit;

determining if the state of either of the first and second switch mechanisms has changed from a non-actuated state since a previous said reading step;

performing a front gear shift operation and setting the shift value to null if both the first and second switch mechanisms have changed to an actuated state since a previous said reading step;

if only one of the first and second switch mechanisms is actuated and a predetermined amount of time has not expired, storing the state of the first and second switch mechanisms as the shift value indicative of which of the first and second switch mechanisms is actuated and reread until either;

a) both switch mechanisms are actuated, in which case performing a front gear shift operation,

b) the one of the first and second switch mechanisms is changed from an actuated state to a non-actuated state since a previous said reading step and the predetermined amount of time has not been exceeded, in which case checking the stored shift value with the control unit and performing a rear gear shift operation according to the stored shift value, or

c) the predetermined amount of time has been exceeded, in which case checking the stored shift value with the control unit and performing a rear gear shift operation according to the stored shift value; and

setting the shift value to null after completion of the front gear shift operation or the rear gear shift operation.

35. The method of shifting a bicycle of claim 34, wherein the control unit is distributed among components of the electronic gear shifting system.

36. The method of shifting a bicycle of claim 34, wherein the control unit is not distributed among components of the electronic gear shifting system.