Electric regeneration apparatus and method for driving a load

• US 4,689,531 A
• Filed: 07/01/1985
• Issued: 08/25/1987
• Est. Priority Date: 07/01/1985
• Status: Expired due to Fees

• Current Assignee: Elizabeth Ann Mcallen, Frances Willis Mcallen, James A Mc Allen Jr, James Argyle Mcallen, James C. Abbott, Mary Margaret Mcallen, Melissa Marie Mcallen, Scott Toothaker, Stephanie Frances Mcallen
• Original Assignee: Ewers and Willis
• Inventors: Bacon, Jimmy R.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Ro, Bentsu
• Application Number:
  US06/750,584
• Time in Patent Office: 785 Days
• Field of Search: 318/139, 318/140, 318/149, 318/150, 318/151, 318/152, 318/153, 318/154, 320/8, 320/9, 320/14, 320/19, 320/21, 320/28, 320/29, 320/31, 320/47, 320/49, 320/54, 322/88
• US Class Current: 318/139
• CPC Class Codes: B60L 2220/20 DC electrical machines
• CPC Class Codes: B60L 50/60 using power supplied by batteries in combination with fuel cells B60L50/75
• CPC Class Codes: B60L 50/62 charged by low-power generators primarily intended to support the batteries, e.g. range extenders
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

Apparatus and method providing electrical regeneration in an electrical vehicle. An electric drive motor drives the vehicle and is powered from a bank of drive battery packs. An electric recharge motor drives a plurality of generators to recharge all of the batteries. The recharge motor is powered from a bank of recharge battery packs. Drive battery packs are paired together with recharge battery packs. A timer switch opens and closes electrical contact between each pair of battery packs and its corresponding electric motor, one pair at a time. Thus, a drive battery pack powers the electric drive motor while a recharge battery pack powers the electric recharge motor. Non-connected battery packs are recharged by the plurality of generators. The timer switch sequentially switches through all pairs of battery packs in such a fashion that each pair of battery packs is recharged for a longer period of time than it is discharged.

Claims

1. Electric regeneration apparatus for driving a load, comprising:

first electric motor means adapted for driving said load;

battery means for providing drive power to said first electric motor means, and for providing recharge power, said battery means including a first plurality of battery packs which provide said drive power, and a second plurality of battery packs which provide said recharge power, each one of said first plurality of battery packs being paired with a corresponding one of said second plurality of battery packs;

generator means for recharging said battery means;

second electric motor means for receiving said recharge power and driving said generator means; and

switching means for switching between pairs of battery packs to cause one of said first plurality of battery pack to provide said drive power while the corresponding battery pack from said second plurality of battery pack provides said recharge power, remaining pairs of battery packs being recharged by said generator means.

2. Apparatus according to claim 1 further including hydraulic drive means, coupled to said first electric motor means, for smoothing drive power applied to said load.

3. Apparatus according to claim 1 wherein said first and second electric motor means are coupled together to equalize loads.

4. Apparatus according to claim 1 further including at least one reserve battery pack which may be connected to either of said first or said second electric motors to replace one or more defective battery packs.

5. Apparatus according to claim 1 further including at least one accessory battery pack to power accessories.

6. Apparatus according to claim 1 further including instrument panel means, coupled to each of said battery packs, for displaying the charge condition of each battery pack.

7. Apparatus according to claim 1 wherein each said battery packs includes two 12 volt DC, 650 amp batteries.

8. Apparatus according to claim 1 wherein said switching means sequentially cycles through all pairs of battery packs, pair-by-pair, to cause each pair to provide power for a predetermined period of time.

9. Apparatus according to claim 8 wherein said switching means provides a period of overlap in switching between pairs so that during said overlap period, two pairs are providing drive and recharge power.

10. Apparatus according to claim 9 wherein said predetermined period of time is approximately 55 seconds, and wherein said period of overlap is approximately equal to 5 seconds.

11. Apparatus according to claim 10 wherein said first and said second plurality of battery packs each include ten battery packs so that each battery pack provides power for approximately 1 minute and is recharged for approximately nine minutes.

12. Apparatus accordng to claim 9 wherein said generator means includes first and second pluralities of generators, each generator in said first plurality of generators being associated with a battery pack in said first plurality of battery packs, and each generator in said second plurality of generators being associated with a battery pack in said second plurality of battery packs.

13. Apparatus according to claim 12 further including relay means, coupled between each said battery pack and its corresponding electric motor means and responsive to said switching means, for opening and closing electrical contact between said battery pack and said corresponding electric motor means.

14. Apparatus according to claim 13 wherein said relay means includes a plurality of relays, each relay associated with one of said battery packs.

15. Apparatus according to claim 13 wherein each battery pack includes two batteries, and wherein one generator is associated with each battery so that each battery is recharged individually.

16. Apparatus according to claim 15 wherein said relay means includes first and second relays, said first relay coupled between said two batteries, and said second relay coupled between said first relay and said corresponding electric motor means.

17. Appratus according to claim 13 further including auxiliary power means, coupled to said generator means and to said second electric motor means, for providing auxiliary AC power, said auxiliary power means including:

an auxiliary shaft coupled to said second electric motor means;

a plurality of distributor means, each distributor means receiving input DC power from a different generator and having a plurality of outputs from which AC power may be derived; and

drive means for driving said plurality of distributor means from said auxiliary shaft.

18. Electric regeneration apparatus for driving a load, comprising:

electric motor means adapted for driving said load, and for providing recharge energy;

first battery means for providing drive power to said electric motor means, and for receiving said recharge energy, said first battery means including a first plurality of battery packs;

second battery means for providing recharge power to said electric motor means, and for receiving said recharge energy, said second battery means including a second plurality of battery packs arranged so that each battery pack of said second plurality of battery packs is paired with a corresponding one of said first plurality of battery packs; and

switching means for sequentially connecting pairs of battery packs to said electric motor means to cause a battery pack from said first plurality of battery packs to provide said drive power while a corresponding battery pack from said second plurality of battery packs provides said recharge power, remaining pairs of battery packs being recharged with said recharge energy.

19. Apparatus according to claim 18 wherein said switching means provides a period of overlap between successive pairs of battery packs so that during said overlap period two pairs of battery packs are connected to said electric motor means.

20. Apparatus according to claim 18 further including generator means for receiving said recharge energy and recharging said first and said second battery means.

21. Apparatus according to claim 20 wherein said generator means includes a first plurality of generators, each one of which is associated with a corresponding one of said first plurality of battery packs, and a second plurality of generators, each one of which is associated with a corresponding one of said second plurality of battery packs.

22. Apparatus according to claim 21 further including relay means coupled to said first and said second battery means and responsive to said switching means, for opening and closing electrical contact between said battery means and said electric motor means.

23. Apparatus according to claim 22 wherein said relay means includes a first plurality of relays, each relay of which is coupled to a corresponding one of said first plurality of battery packs, and a second plurality of relays, each relay of which is coupled to a corresponding one of said second plurality of battery packs.

24. Apparatus according to claim 23 wherein said electric motor means includes a first electric motor coupled to said first plurality of relays, for driving said load, and a second electric motor coupled to said second plurality of relays, for providing said recharge energy.

25. Apparatus according to claim 24 wherein said first and said second electric motors are coupled together to equalize loads.

26. Appratus according to claim 20 wherein each said battery pack includes two batteries, and wherein said generator means includes one generator coupled to each battery.

27. Apparatus according to claim 26 further including relay means responsive to said switching means, for establishing electrical contact between said battery means and said electric motor means, said relay means including, for each said battery pack, a first relay for coupling together said two batteries, and a second relay for coupling said battery pack to said electric motor means.

28. Apparatus according to claim 20 further including distributor means, coupled to said electric motor means, for providing auxiliary AC power, said distributor means including a plurality of distributors, each one of which receives energy from said generator means and providing a plurality of outputs from which said AC power is derived.

29. Apparatus according to claim 18 further including accessory battery pack means for providing power to accessories.

30. Apparatus according to claim 18 further including reserve battery pack means for providing reserve power to said electric motor means.

31. Apparatus according to claim 18 further including instrument panel means, coupled to said first and second battery means, for displaying an electrical condition of said battery means.

32. Apparatus according to claim 18 further including hydraulic drive means, coupled to said electric motor means, for smoothing force applied to said load.

33. Apparatus according to claim 18 wherein each battery pack includes two, twelve volt DC batteries coupled in series.

34. Apparatus according to claim 33 wherein said first and said second plurality of battery packs each include ten battery packs.

35. Electrical regeneration apparatus for driving an electrical automobile, comprising:

electrical drive motor means adapted to drive said automobile;

a first plurality of battery means for providing drive power to said drive motor means;

a second plurality of battery means, arranged with said first plurality of battery means in pairs, for providing recharging power;

generator means for recharging said first and second plurality of battery means;

electrical recharge motor means for receiving said recharging power and driving said generator means; and

control means for switching between said pairs to cause one of said first plurality of battery means to power said drive motor means while a corresponding one of said second plurality of means sequentially switching through all pairs of battery means, pair-by-pair, while all pairs not providing power are recharged by said generator means.

36. Apparatus according to claim 35 wherein said control means includes:

timer switch means for switching between said pairs of battery means at given intervals of time; and

relay means, responsive to said timer switch means, for opening and closing electrical contact between said battery means and said electrical drive motor means.

37. Appratus according to claim 36 wherein said timer switch means provides a period of overlap between adjacent time intervals during which two pairs of battery means are connected to said electrical drive motor means and said electrical recharge motor means to cause said switching to be smooth.

38. A method of powering an electrical car having a electric drive motor, an electric recharge motor, first and second pluralities of battery packs, and generators connected to said recharge motor and to said battery packs, comprising the steps of:

selecting a first pair of battery packs including a first battery pack from said first plurality of battery packs and a second battery pack from said second plurality of battery packs;

connecting said first battery pack to said electric drive motor, and said second battery pack to said electric recharge motor for a predetermined period of time;

recharging non-connected pairs of battery packs from said generators and said electric recharge motor;

disconnecting said first pair of battery packs from said electric motors, and connecting a second pair of battery packs to said electric motors, said first pair of battery packs being recharged with other non-connected pairs of battery packs; and

sequentially repeating said disconnecting and connecting step for all pairs of battery packs.

39. A method according to claim 38 wherein said first pair of battery packs is not disconnected until a predetermined interval of time after said second pair of battery packs is connected, said predetermined interval of time being shorter than said predetermined period of time.

40. A method according to claim 39 wherein said predetermined period of time is approximately one minute, and said predetermined interval of time is approximately five seconds.