System and method for bicycle riding simulation

• US 5,240,417 A
• Filed: 03/14/1991
• Issued: 08/31/1993
• Est. Priority Date: 03/14/1991
• Status: Expired due to Fees

• Current Assignee: Midway Games West, Inc. (Scientific Games Corporation)
• Original Assignee: Atari Incorporated (Infogrames Entertainment SA)
• Inventors: Smithson, Bonnie J., Lichac, Gerald J., Moncrief, Rick L., Winblad, Wade O., Aknin, Jacques D.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Cheng, Joe H.
• Application Number:
  US07/670,268
• Time in Patent Office: 901 Days
• Field of Search: 482/1, 482/4-8, 482/57, 482/900-903, 434/29, 434/61, 434/247, 434/307, 364/410, 364/578, 73/379, 73/379.01, 73/379.06, 73/379.07, 373/148 B, 373/434, 373/438, 373/85 G, 373/DIG. 28, 358/87, 358/104
• US Class Current: 434/61
• CPC Class Codes: A63B 2022/0641 enabling a lateral movement of the exercising apparatus, e.g. for simulating movement on a bicycle
• CPC Class Codes: A63B 2024/009 the load of the exercise apparatus being controlled in synchronism with visualising systems, e.g. hill slope
• CPC Class Codes: A63B 2071/0625 Emitting sound, noise or music
• CPC Class Codes: A63B 2071/0641 with a marker advancing in function of the exercise
• CPC Class Codes: A63B 2071/0644 with display speed of moving landscape controlled by the user's performance
• CPC Class Codes: A63B 21/00181 comprising additional means assisting the user to overcome part of the resisting force, i.e. assisted-active exercising
• CPC Class Codes: A63B 21/0058 using motors
• CPC Class Codes: A63B 22/0087 with a seat or torso support moving during the exercise, e.g. reformers A63B22/0076 takes precedence
• CPC Class Codes: A63B 22/0605 performing a circular movement, e.g. ergometers
• CPC Class Codes: A63B 22/16 Platforms for rocking motion about a horizontal axis , e.g. axis through the middle of the platform; Balancing drums; Balancing boards or the like exercising apparatus with cantilevered support elements pivoting about an axis A63B22/0056; other exercising apparatus for improving balance A63B26/003
• CPC Class Codes: A63B 2220/34 Angular speed
• CPC Class Codes: A63B 2220/76 Wind conditions
• CPC Class Codes: A63B 2220/78 Surface covering conditions, e.g. of a road surface
• CPC Class Codes: A63B 2225/70 Coin-operated
• CPC Class Codes: A63B 26/003 for improving balance or equilibrium balance beams A63B4/00; apparatus for rope dancing A63B7/08; balancing drums, balancing boards or the like A63B22/16
• CPC Class Codes: A63F 13/211 using inertial sensors, e.g. accelerometers or gyroscopes
• CPC Class Codes: A63F 13/245 specially adapted to a particular type of game, e.g. steering wheels
• CPC Class Codes: A63F 13/285 Generating tactile feedback signals via the game input device, e.g. force feedback
• CPC Class Codes: A63F 13/57 Simulating properties, behaviour or motion of objects in the game world, e.g. computing tyre load in a car race game A63F13/56 takes precedence
• CPC Class Codes: A63F 13/803 Driving vehicles or craft, e.g. cars, airplanes, ships, robots or tanks
• CPC Class Codes: A63F 13/816 : Athletics, e.g. track-and-field sports
• CPC Class Codes: A63F 2300/1037 : being specially adapted for converting control signals received from the game device into a haptic signal, e.g. using force feedback
• CPC Class Codes: A63F 2300/105 : using inertial sensors, e.g. accelerometers, gyroscopes
• CPC Class Codes: A63F 2300/1062 : being specially adapted to a type of game, e.g. steering wheel
• CPC Class Codes: A63F 2300/64 : for computing dynamical parameters of game objects, e.g. motion determination or computation of frictional forces for a virtual car
• CPC Class Codes: A63F 2300/8005 : Athletics
• CPC Class Codes: A63F 2300/8017 : Driving on land or water; Flying
• CPC Class Codes: G05B 17/02 : electric
• CPC Class Codes: G09B 9/05 : the view from a vehicle being simulated G09B9/052, G09B9/058 take precedence
• CPC Class Codes: G09B 9/058 : for teaching control of cycles or motorcycles
• CPC Class Codes: Y10S 482/902 : Employing specific graphic or video display

Abstract

A system for simulating bicycle riding which incorporates a conventionally-appearing bicycle physically maneuverable by a system user. Front and rear bicycle wheels are provided solely for visual authenticity. The simulating system provides electrical communication between mechanical maneuvering of the bicycle and a video display to visually reflect changes in speed and bicycle position on a variable-terrain track in response to pedaling, braking and steering changes by the user. Specifically, the system permits simultaneous lateral displacement and leaning of the bicycle away from the vertical plane to simulate travel about a curve. The system also permits rotation in a vertical plane about a pivot point proximate to the rear bicycle tire to simulate "wheelie" motion. These changes are monitored by sensors which transmit information to a computer which, in turn, correspondingly adjusts the position of an animated bicycle on the track using computer animation made possible by a unique bicycle model program. The computer considers the influence of the forces of nature on the bicycle and user. In addition, a computer-controlled motor simulates changing conditions of the track terrain, including downhill coasting by applying power assistance to bicyclist pedaling action. Finally, an audio system and a variable-speed air blower are provided, both interfaced with the computer to enhance riding simulation.

Claims

1. A bicycle riding simulation system comprising:

a. a bicycle having a rigid frame for supporting a bicyclist thereon, said frame comprising a pedalling mechanism and steerable handlebars mounted at a forward portion of said rigid frame, said handlebars having at least one hand brake mounted thereon;

b. a computer having a means for modeling the position of the bicycle in a track universe wherein said modeling means combines physical forces exerted on the bicycle by a bicyclist with simulated forces of nature programmed within the modeling means, the combination of the physical forces and the simulated forces influencing the bicycle position in said track universe over a period of time;

c. a plurality of sensing devices mounted at selected specific locations within the system, said sensing devices configured to detect the forces exerted on the bicycle by the bicyclist, said sensing devices being in electrical communication with the computer;

d. a video display for displaying a portion of the track universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to pedalling, braking and steering changes by the bicyclist, said video display in electrical communication with the computer;

e. a motor responsive to the computer for increasing resistance to bicyclist pedalling in the track universe to simulate the bicycle encountering uphill and rough terrain and for providing power assistance to bicyclist pedalling in the track universe to simulate downhill terrain thereby simulating varying terrain as shown on the video display;

f. a drive axle mechanically linked both to the motor and the pedalling mechanism, said drive axle transferring increased resistance and power assistance to the pedalling mechanism;

g. a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

h. a follower assembly integral with the support assembly, said follower assembly operable to permit a bicyclist to move the bicycle laterally in either opposing directions and to cause the bicycle to simultaneously lean oblique to a vertical plane, said follower assembly comprising a steering assembly integral with the steerable handlebars, a roller assembly pivotally secured to a second end of the main beam, a linkage assembly linking the steering assembly with the roller assembly, and a rolling pin rotatable about a horizontal axle and mechanically linked to the drive axle so as to be responsive to bicyclist pedalling action and the motor;

i. a roller incorporated within the roller assembly, said roller slidably engaging the rolling pin so as to permit the main beam to pivot about the gimbal assembly while maintaining constant contact with said rolling pin; and

j. a wheelie assembly for simulating rotation of the bicycle in a vertical plane about an axis orthogonal to, and proximate to the rear portion of, the bicycle, said wheelie assembly comprising the bicycle support and a rearwardly extending extension arm connected thereto, a rear end of said extension arm pivotally mounted to the main beam about an axis proximate to the rear portion of the bicycle so that a shift in the center of mass of the bicyclist in a rearward direction causes the wheelie assembly to rotate rearwardly.

2. The system of claim 1 further comprising:

a base enclosure enclosing a portion of the support assembly, said base enclosure having an opening in a top wall thereof so that the bicycle support extends through the opening; and

a turntable rotatably secured to the top wall of the base support, said turntable encircling the bicycle support and covering a substantial portion of the slotted opening so as to permit the vertical bicycle support to move laterally while substantially concealing the interior contents of the base enclosure.

3. The system of claim 1 further comprising a blower assembly having a fan motor in electrical communication with the computer so that the velocity of the fan motor can be varied, said blower assembly directing forced air toward the bicyclist to simulate varying wind conditions.

4. The system of claim 1 wherein the forces of nature, which assist in determining the bicycle position over a period of time, comprise gravity, friction and air resistance.

5. The system of claim 1 wherein the sensing devices comprise potentiometers for monitoring relative movement of bicycle components as directed by the bicyclist, said bicycle components including the bicycle, the support assembly, the follower assembly, the roller assembly and the wheelie assembly.

6. The system of claim 5 wherein the sensing devices further comprise an optocoupler for sensing rotational velocity of the motor.

7. The system of claim 1 wherein the system further comprises a sound system connected to the computer for providing audio sounds of simulated bicycle movement in the track universe.

8. A bicycle riding simulation system comprising:

a bicycle including a rigid frame, steerable handlebars and a pedalling mechanism, said bicycle configured to support a bicyclist thereon;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

means for applying forces to components of the bicycle in response to selected physical riding conditions, said components of the bicycle including the bicycle, the bicycle support and the gimbal assembly;

a set of sensor mounted on the bicycle and the support assembly;

a computer electrically connected to the sensors for modeling simulated motion of the bicycle in a track universe wherein said computer combines physical forces exerted on the bicycle by a bicyclist, as detected by said set of sensors, with simulated forces of nature, provided within the computer, to determine the bicycle position on the track over a period of time, and

a video display for displaying a portion of the track universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to changes in pedalling, braking, leaning and steering made by the bicyclist;

wherein said force applying means comprising a drive axle secured within the gimbal assembly and mechanically linked to the pedalling mechanism, a variably-controlled motor responsive to the computer for increasing resistance to bicyclist pedalling in the track universe to simulate the bicycle encountering uphill and rough terrain and for providing power assistance to bicyclist pedalling in the track universe to simulate downhill terrain, said motor being mechanically linked with the drive axle, and a rolling pin rotatable about a horizontal axle and mechanically linked to the drive axle so as to be responsive to mechanical energy generated by both the motor and the pedalling mechanism.

9. The system of claim 8 wherein the force applying means comprises:

a steering assembly partially housed in the bicycle support and partially comprising the steerable handlebars;

a rolling pin rotatable about a horizontal axle and mechanically linked to the pedaling mechanism so as to be responsive to bicyclist pedaling;

a roller assembly, pivotally secured to a second end of the main beam and mechanically linked to the steering assembly, said roller assembly including a roller for slidably engaging the roller pin, and

a linkage assembly linking the steering assembly with the roller assembly.

10. The system of claim 8 wherein the force applying means comprises:

the bicycle support supported by the main beam, and

an extension arm extending rearwardly from the bicycle support, a first end of said extension arm being pivotal about the rear axle proximate to the rear portion of the bicycle so that a shift in the center of mass of the bicyclist in a rearward direction causes the extension arm to rotate rearwardly.

11. A bicycle simulator comprising:

a bicycle including a rigid frame, steerable handlebars and a pedaling mechanism, said bicycle configured to support a bicyclist thereon;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

circuit means for generating control signals; and

power means responsive to the control signals for increasing resistance to the pedalling mechanism to simulate the bicycle encountering uphill and rough terrain and for providing power assistance to the pedalling mechanism to simulate downhill terrain thereby simulating forward movement of the bicycle under varying resistive loads.

12. The system of claim 11 wherein said circuit means comprises modeling means responsive to movement of the pedaling mechanism for modeling bicycle movement in a simulated universe.

13. The system of claim 12 wherein the modeling means includes a digital computer and computer software.

14. The system of claim 13 wherein the computer models the motion of the bicycle in a track universe such that the combination of physical forces exerted on the bicycle by a bicyclist at the steerable handlebars and at the pedalling mechanism and simulated forces of nature included within the modeling means determine the bicycle position over a period of time.

15. The system of claim 13 wherein the power means comprises:

a variably-controlled motor responsive to the computer; and

means for transferring the increased resistance and power assistance of the motor to the pedaling mechanism.

16. The system of claim 15 wherein the transferring means comprises a drive axle secured within the gimbal assembly and mechanically linked to the motor.

17. The system of claim 16 wherein the support assembly further comprises:

a rolling pin rotatable about a horizontal axle and mechanically linked to the drive axle so as to be responsive to both bicyclist pedaling action and the power means; and

a roller assembly pivotally secured to a second end of the main beam and mechanically linked to the steerable handlebars of the bicycle, said roller assembly including a roller for slidably engaging the rolling pin thereby permitting the main beam to pivot about the gimbal assembly while maintaining constant contact with said rolling pin.

18. The system of claim 12 further comprising a video display for displaying a portion of the simulated universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to pedaling, braking, leaning and steering changes of the bicyclist.

19. A bicycle riding simulator system comprising:

a bicycle comprising a rigid frame for supporting a bicyclist, steerable handlebars and a pedaling mechanism;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a pivoting main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam; and

a follower assembly integral with the support assembly and linked to the steerable handlebars, said follower assembly operable to permit a bicyclist to move the bicycle laterally in either of opposing directions causing said bicycle to simultaneously lean oblique to a vertical plane to simulate travel about a curve, said follower assembly comprising a steering assembly integral with the steerable handlebars, a roller assembly pivotally secured to a second end of the main beam, a linkage assembly linking the steering assembly with the roller assembly, and a rolling pin rotatable about a horizontal axle and mechanically linked to the bicycle pedaling mechanism.

20. The system of claim 19 wherein the roller assembly includes a roller for slidably engaging the rolling pin so as to permit the main beam to pivot about the gimbal assembly while maintaining constant contact with said rolling pin.

21. The system of claim 19 wherein the steering assembly is housed partially within the rigid bicycle frame.

22. The system of claim 19 further comprising a modeling means for modeling the motion of a simulated bicycle in a track universe wherein said modeling means combines physical forces exerted on the bicycle by a bicyclist at said steerable handlebars and at said pedalling mechanism with simulated forces of nature provided in the modeling means to determine the position of the simulated bicycle over a period of time.

23. The system of claim 22 wherein the modeling means is a computer electronically connected to the support assembly and the follower assembly.

24. A bicycle riding simulator system comprising:

a bicycle comprising a rigid frame and steerable handlebars;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

a wheelie assembly integral with the support assembly for simulating rotation of the bicycle in a vertical plane about an axis orthogonal to, and proximate to the rear portion of, the bicycle; and

means responsive to movement of the bicycle by the bicyclist for modeling the motion of a simulated bicycle in a track universe.

25. The system of claim 24 wherein the wheelie assembly comprises the support assembly and a rearwardly-extending extension arm connected thereto, a rear end of said extension arm being pivotally mounted to a second end of the main beam about an axis orthogonal to, and proximate to the rear portion of, the bicycle so that a shift in the center of mass of the bicyclist in a rearward direction causes the wheelie assembly to rotate rearwardly.

26. The system of claim 24 wherein the modeling means includes a computer electrically connected by a set of sensors to the bicycle.

27. The system of claim 26 wherein the computer models the motion of the simulated bicycle in a track universe wherein movement of said bicycle by a bicyclist is monitored by said sensors and combined with simulated forces of nature provided within said computer to determine motion of the simulated bicycle over a period of time.

28. A bicycle riding simulator system comprising:

a bicycle comprising a rigid frame supporting a bicyclist, said frame comprising a pedalling mechanism and steerable handlebars mounted at forward portion of said rigid frame;

means for modeling the motion of a simulated bicycle in a track universe;

sensing means mounted at selected locations within said simulator system and in electrical communication with the modeling means for sensing mechanical movement of the bicycle;

means responsive to the modeling means for progressively displaying the motion of the simulated bicycle through the track universe;

means for movably supporting the bicycle, said supporting means operable so as to permit lateral movement of said bicycle by the bicyclist;

means mechanically linked to the supporting means for simulating a wheelie, said wheelie simulating means operable to permit rotation of the bicycle in a vertical plane about an axis orthogonal to, and proximate to the rear portion of, the bicycle; and

means mechanically linked to the supporting means for simulating bicycle travel over variable road conditions, said bicycle travel simulating means responsive to said modeling means and configured to provide power assistance to bicyclist pedalling action to simulate downhill movement.

29. The system of claim 28 wherein the supporting means comprises a bicycle support and a pivoting main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam.

30. The system of claim 29 wherein the supporting means further comprises a follower assembly operable to permit the bicycle to lean oblique to a vertical plane simultaneously with lateral movement of the bicycle.

31. The system of claim 30 wherein the follower assembly further comprises a roller assembly pivotally secured to a second end of the main beam and mechanically linked to the steerable handlebars of the bicycle.

32. The system of claim 29 wherein the wheelie means comprises a rearwardly-extending extension arm connected to said bicycle support, a rear end of said extension arm pivotally mounted to the main beam about an axis orthogonal to, and proximate to the rear portion of, the bicycle so that a shift in the center of mass of the bicyclist in a rearward direction causes the wheelie assembly to rotate rearwardly.

33. The system of claim 29 wherein the comprises:

a motor responsive to the modeling means for increasing resistance to bicyclist pedalling in the track universe to simulate the bicycle encountering uphill and rough terrain and for providing power assistance to bicyclist pedalling in the track universe to simulate downhill terrain thereby simulating varying terrain; and

a drive axle rotatingly secured within the gimbal assembly and mechanically linked to the motor, said drive axle transferring increased resistance and power assistance to the pedaling mechanism.

34. The system of claim 28 wherein the simulator system further comprises a rolling pin rotatable about a horizontal axle and mechanically linked to the pedaling mechanism so as to be responsive to bicyclist pedaling action and the bicycle travel simulating means.

35. The system of claim 34 wherein the roller assembly further includes a roller for slidably engaging the rolling pin thereby permitting said main beam to pivot about the gimbal assembly while maintaining constant contact with said rolling pin.

36. The system of claim 28 wherein the modeling means includes a computer electrically connected to the sensing means on the bicycle, said computer combining physical forces exerted on the bicycle by a bicyclist, as monitored by said sensing means, with simulated forces of nature included with in the modeling means to determine the bicycle position of the simulated bicycle over a period of time.

37. The system of claim 28 wherein the displaying means comprises a video display for displaying a portion of the track universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to pedaling, braking and steering changes by the bicyclist.

38. A bicycle riding simulator comprising:

a conventionally-appearing bicycle having a rigid frame supporting a bicyclist, said frame comprising a pedaling mechanism, steerable handlebars, a seat, a rear tire and a front tire supported by a rotating front fork, said steerable handlebars being mounted at forward portion of said rigid frame and coupled to said front fork;

means for movably supporting the conventionally-appearing bicycle in a manner which eliminates functional rotation of the front and rear tires by eliminating engagement of the front and rear tires with the pedalling mechanism, said pedaling mechanism being connected directly to said movable support means rather than to the rear tire, said movable support means operable to provide leaning of the bicycle oblique to a vertical plane while simultaneously providing lateral movement of the bicycle, circuit means for providing control signals, and power means responsive to said control signals for increasing resistance to bicyclist pedalling in a simulated track universe to simulate the bicycle encountering uphill and rough terrain and for providing power assistance to bicyclist pedalling in said simulated track universe to simulate downhill terrain.

39. The system of claim 38 wherein the movable support means comprises a bicycle support and a pivoting main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam.

40. A method for simulating bicycle riding comprising the steps of:

providing a bicycle having a rigid frame, a pedaling mechanism, steerable handlebars mounted at a forward portion of said rigid frame;

movably supporting the bicycle by a movable support means;

sensing various modes of mechanical movement of the bicycle as measured positions;

modeling the motion of a simulated bicycle in a track universe based on the measured positions;

communicating a control signal generated by the modeling step to a feedback motor; and

simulating bicycle travel over variable road conditions including providing power assistance from said feedback motor to bicyclist pedaling action to simulate downhill movement in said track universe.

41. The method of claim 40 further comprising the step of permitting rotation of the bicycle in a vertical plane about an axis proximate to the rear portion of the bicycle.

42. The method of claim 40 further comprising the step of progressively displaying motion of the bicycle through the track universe on a video display so as to produce animation.

43. The method of claim 42 wherein the step of displaying comprises updating a video display to visually reflect changes in bicycle speed and track position in response to pedaling, braking, leaning and steering changes by the bicyclist.

44. The method of claim 40 wherein the bicycle includes a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a front end of said main beam.

45. The method of claim 44 wherein the simulated bicycle further comprises the step of providing a follower assembly operable to provide simultaneous lateral movement of the bicycle while providing leaning of the bicycle oblique to a vertical plane.

46. The method of claim 45 further comprising the step of permitting the main beam to pivot about the gimbal assembly while maintaining constant contact with a rolling pin.

47. The method of claim 40 wherein the step of modeling includes calculating forces exerted on the bicycle by a bicyclist and simulating forces of nature such that the motion of the simulated bicycle is determined over a period of time.

48. The method of claim 40 wherein the step of providing power assistance to bicyclist pedalling action is accomplished via a drive axle mechanically linked to a motor, said motor configured to provide resistance to simulate the bicycle encountering uphill and rough terrain and to provide power assistance to simulate downhill terrain.

49. A bicycle riding simulation system comprising:

a bicycle including a rigid frame, steerable handlebars and a pedalling mechanism, said bicycle configured to support a bicyclist thereon;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

means for applying forces to components of the bicycle in response to selected physical riding conditions, said components of the bicycle including the bicycle, the bicycle support and the gimbal assembly, said force applying means comprising a steering assembly partially housed in the bicycle support and partially comprising the steerable handlebars, a rolling pin rotatable about a horizontal axle and mechanically linked to the pedaling mechanism so as to be responsive to bicyclist pedaling, a roller assembly, pivotally secured to a second end of the main beam and mechanically linked to the steering assembly, said roller assembly including a roller for slidably engaging the rolling pin, and a linkage assembly linking the steering assembly with the roller assembly;

a plurality of sensors mounted on the bicycle and the support assembly;

a computer electrically connected to the sensors for modeling simulated motion of the bicycle in a track universe wherein said computer combines the physical forces exerted on the bicycle by a bicyclist, as detected by said plurality of sensors, with simulated forces of nature, provided within the computer, to determine the bicycle position on a track over a period of time, and

a video display for displaying a portion of the track universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to changes in pedalling, braking, leaning and steering made by the bicyclist.

50. A bicycle riding simulation system comprising:

a bicycle including a rigid frame, steerable handlebars and a pedalling mechanism, said bicycle configured to support a bicyclist thereon;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

means for applying forces to components of the bicycle in response to selected physical riding conditions, said components of the bicycle including the bicycle, the bicycle support and the gimbal assembly, said force applying means comprising an extension arm extending rearwardly from the bicycle support, a first end of said extension arm being pivotal about the rear axle proximate to the rear portion of the bicycle so that a shift in the center of mass of the bicyclist in a rearward direction causes a wheelie assembly to rotate rearwardly;

a plurality of sensors mounted on the bicycle and the support assembly;

a computer electrically connected to the sensors for modeling simulated motion of the bicycle in a track universe wherein said computer combines the physical forces exerted on the bicycle by a bicyclist, as detected by said plurality of sensors, with simulated forces of nature, provided within the computer, to determine the bicycle position on a track over a period of time, and

a video display for displaying a portion of the track universe in which bicycle travel is simulated, said video display being updated to visually reflect changes in bicycle speed and track position in response to changes in pedalling, braking, leaning and steering made by the bicyclist.

51. A bicycle simulator comprising:

a bicycle including a rigid frame, steerable handlebars and a pedaling mechanism, said bicycle configured to support a bicyclist thereon;

a support assembly movably supporting the bicycle, said support assembly comprising a bicycle support and a main beam supporting said bicycle support, said main beam laterally pivotable about a gimbal assembly located at a first end of said main beam;

circuit means for generating control signals; and

power means responsive to the control signals for providing power assistance to the pedalling mechanism to simulate downhill terrain.