Human-powered or human-assisted energy generation and transmission system with energy storage means and improved efficiency

• US 6,217,398 B1
• Filed: 04/16/1999
• Issued: 04/17/2001
• Est. Priority Date: 04/17/1998
• Status: Active Grant

• Current Assignee: Arrowswift Incorporated
• Original Assignee: Arrowswift Incorporated
• Inventors: Davis, Donald L.
• Primary Examiner(s): Sotelo, Jesus D.
• Application Number:
  US09/293,144
• Time in Patent Office: 732 Days
• Field of Search: 440/21, 440/26, 440/27, 440/28, 440/29, 440/30, 440/31, 280/212, 280/215, 280/216, 474/50
• US Class Current: 440/21
• CPC Class Codes: B62M 6/45 Control or actuating devices therefor
• CPC Class Codes: B63H 16/00 Marine propulsion by muscle power
• CPC Class Codes: B63H 23/24 electric dynamo-electric machines H02K

Abstract

Efficient human-powered or human-power assisted energy generation and transmission system adapted for use with vehicles. The present invention can be utilized to achieve overall energy transmission efficiency superior to mechanical drives that utilize chains and sprockets or other mechanical drive mechanisms. The present invention can completely eliminate the need for multiple sprockets and the associated shifting mechanisms presently used in most bicycles. By utilizing high efficiency, light weight, direct-drive generators and motors, and an input controller, coupled with an efficient energy storage device, the present invention can reduce the overall weight and complexities of mechanical power transmissions, while, at the same time, offer higher overall efficiencies. In addition, the energy output to the output drive device can be controlled, through profiling and with an output controller, to maintain constant output, independent of instantaneous input. Thus, in a human-powered vehicle, constant thrust can be maintained significantly increasing the vehicle efficiency, compared to the cyclical thrust or torque generated using a mechanical system.

Claims

1. A human-powered energy generation and transmission system, comprising:

an input mechanism adapted to be powered by a human operator for creation of mechanical energy;

an electrical generation mechanism connected to the input mechanism and adapted to convert the mechanical energy into electric energy;

an energy storage mechanism connected to the electrical generation mechanism and adapted to retain the electrical energy converted by the generator;

a position sensing mechanism connected to the human-powered input mechanism to sense position of the human-powered input mechanism;

a controller connected to the electrical generation mechanism, the position sensing mechanism, and the energy storage mechanism, and adapted to control the load on the electrical generation mechanism to maximize human-powered energy output efficiency; and

an output mechanism connected to the input mechanism and energy storage mechanism and adapted to control conversion of electrical energy to obtain the desired type and levels of voltage and current.

2. The human-powered energy generation and transmission system of claim 1 wherein the energy storage mechanism is an ultracapacitor.

3. The human-powered energy generation and transmission system of claim 1 wherein the energy storage mechanism is a thin metal film battery.

4. The human-powered energy generation and transmission system of claim 1 wherein the energy storage mechanism is a flywheel with a built-in motor/generator to input and output energy, respectively.

5. The human-powered energy generation and transmission system of claim 1 utilized in a human-powered boat.

6. The human-powered energy generation and transmission system of claim 5 wherein the boat includes planing hulls, the energy storage mechanism being sufficiently large to bring the boat up on plane, and the planing hulls being adapted to maintain the boat on plane with human-powered input and no assistance from the energy storage mechanism.

7. The human-powered energy generation and transmission system of claim 1 further including an operator interface device to display operation information to the human operator.

8. A human-powered vehicle comprising:

a human-powered input mechanism adapted to move between minimum and maximum energy generation positions;

at least one generator connected to the human-powered input mechanism and adapted to convert mechanical energy created by the human-powered input mechanism to electrical energy;

an energy storage means connected to the generator and adapted to store electric energy;

at least one output mechanism connected to the input mechanism and the energy storage means and adapted to provide locomotion to the vehicle; and

a controller adapted to release maximum energy from the energy storage means to the output mechanism when the input mechanism is at the minimum energy generation position, and minimum energy when the input mechanism is at the maximum energy generation position.

9. The human-powered vehicle of claim 8 wherein the human-powered input mechanism produces energy along a cyclical profile and the controller releases energy at a rate inverse to the cyclical profile of the input mechanism.

10. The human-powered vehicle of claim 9 wherein each output mechanism includes a motor adapted to convert the electrical energy to mechanical energy to drive wheels of the vehicle.

11. The human-powered vehicle of claim 9 wherein each generator is directly coupled to an input mechanism and each motor is directly coupled to a wheel of the vehicle.

12. A method of powering an at least partially human-powered vehicle comprising the steps of:

profiling the motion of the human operator to determine positions of maximum mechanical advantage and minimum mechanical advantage;

generating mechanical energy through motion of the human operator;

utilizing at least a portion of the mechanical energy to provide locomotion to the vehicle; and

releasing energy from a storage source in a controlled manner such that maximum energy is released when the human operator is in a position of minimum mechanical advantage, and minimum energy is released when the human operator is in a position of maximum mechanical advantage.

13. The method of claim 12 further including the step of storing at least a portion of the generated mechanical energy as electrical energy in the storage source.

14. The method of claim 12 further including the step of releasing maximum energy from the storage source when the vehicle is in maximum need of energy.

15. The method of claim 12 wherein the profiling step is performed using a position sensing mechanism.

16. An at least partially powered human vehicle, comprising:

an input adapted to receive human power and generate mechanical energy;

a generator adapted to convert the mechanical energy to electrical energy;

a storage reservoir adapted to store the electrical energy;

an output adapted to utilize the mechanical energy to drive the vehicle and to convert the electrical energy to mechanical energy to drive the vehicle; and

a controller adapted to direct maximum energy from the input and the storage reservoir to the output when desired by the operator such that maximum energy is directed from the storage reservoir when a position of the input is at a minimum energy generation position.

17. The vehicle of claim 16 further including an operator interface module in communication with the controller and adapted to display information to the operator as well as allow parameters to be set by the operator.

18. The vehicle of claim 16 wherein the output includes a high efficiency motor and the vehicle includes exterior surfaces with reduced drag to improve the overall efficiency of the vehicle.

19. The vehicle of claim 16 further including means for sensing the position of the human-powered input, and wherein the controller is adapted to profile the motion of the human-powered input and release energy from the storage reservoir based on the position of the human-powered input relative to the profile.