Electrical system for a motor vehicle

• US 5,925,938 A
• Filed: 03/05/1997
• Issued: 07/20/1999
• Est. Priority Date: 03/05/1997
• Status: Expired due to Term

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Tamor, Michael Alan
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US08/811,626
• Time in Patent Office: 867 Days
• Field of Search: 322/16, 322/60, 290/1 R, 290/27, 290/31, 290/38 R, 318/139, 320/166
• US Class Current: 290/31
• CPC Class Codes: F02N 11/04 the motors being associated with current generators

Abstract

In one embodiment of the present invention, an electrical system for a motor vehicle comprises a capacitor, an engine cranking motor coupled to receive motive power from the capacitor, a storage battery and an electrical generator having an electrical power output, the output coupled to provide electrical energy to the capacitor and to the storage battery. The electrical system also includes a resistor which limits current flow from the battery to the engine cranking motor. The electrical system further includes a diode which allows current flow through the diode from the generator to the battery but which blocks current flow through the diode from the battery to the cranking motor.

Claims

1. An electrical system for a motor vehicle, said system comprising:

a capacitor;

an engine cranking motor coupled to receive motive power from said capacitor;

a storage battery;

an electrical generator having an electrical power output, said output coupled to provide electrical energy to said capacitor and to said storage battery;

current-limiting means for limiting current flow from said battery to said engine cranking motor.

2. An electrical system as recited in claim 1, further comprising blocking means for allowing current flow through said blocking means from said output of said electrical generator to said storage battery and for preventing current flow through said blocking means from said storage battery to said engine cranking motor.

3. An electrical system as recited in claim 1, wherein:

said electrical system includes a relatively-higher voltage portion and a relatively lower-voltage portion; and

said engine cranking motor, said generator, said capacitor, said storage battery and said current-limiting means are located in said higher-voltage portion.

4. An electrical system as recited in claim 2, wherein:

said electrical system includes a relatively-higher voltage portion and a relatively lower-voltage portion; and

said engine cranking motor, said generator, said capacitor, said storage battery, said blocking means and said current-limiting means are located in said higher-voltage portion.

5. An electrical system as recited in claim 1, further comprising:

blocking means coupled for allowing current flow through said blocking means from said capacitor to said engine cranking motor and for blocking current flow through said blocking means from said generator to said capacitor; and

second current-limiting means coupled in parallel with said blocking means.

6. An electrical system as recited in claim 4, further comprising:

second blocking means coupled for allowing current flow from said capacitor to said engine cranking motor and for blocking current flow through said second blocking means from said generator to said capacitor; and

second current-limiting means coupled in parallel with said second blocking means.

7. An electrical system as recited in claim 4, wherein:

said first and second current-limiting means are resistors; and

said blocking means is a diode.

8. An electrical system as recited in claim 6, wherein;

said blocking means and said second blocking means are diodes; and

said current-limiting means and said second current-limiting means are resistors.

9. An electrical system as recited in claim 7, wherein said engine cranking motor and said generator are integrated as a single component.

10. An electrical system as recited in claim 8, wherein said engine cranking motor and said generator are integrated as a single component.

11. An electrical system for a motor vehicle, said system comprising:

a capacitor;

an engine cranking motor coupled to receive motive power from said capacitor;

a storage battery;

an electrical generator having an electrical power output, said output coupled to provide electrical energy to said capacitor and to said storage battery;

blocking means for allowing current flow through said blocking means from said output of said electrical generator to said storage battery and for preventing current flow through said blocking means from said storage battery to said engine cranking motor.

12. An electrical system as recited in claim 11, further comprising current-limiting means coupled in parallel across said blocking means.

13. An electrical system as recited in claim 11, wherein:

said electrical system includes a relatively-higher voltage portion and a relatively lower-voltage portion; and

said engine cranking motor, said generator, said capacitor, said storage battery and said blocking means are located in said higher-voltage portion.

14. An electrical system as recited in claim 12, wherein:

said electrical system includes a relatively-higher voltage portion and a relatively lower-voltage portion; and

said engine cranking motor, said generator, said capacitor, said storage battery, said blocking means and said current-limiting means are located in said higher-voltage portion.

15. An electrical system as recited in claim 11, further comprising:

second blocking means coupled for allowing current flow from said capacitor to said engine cranking motor and for blocking current flow through said second blocking means from said generator to said capacitor; and

current-limiting means coupled in parallel with said second blocking means.

16. An electrical system as recited in claim 14, further comprising:

second blocking means coupled for allowing current flow from said capacitor to said engine cranking motor and for blocking current flow through said second blocking means from said generator to said capacitor; and

second current-limiting means coupled in parallel with said second blocking means.

17. An electrical system as recited in claim 14, wherein:

said first and second blocking means are diodes; and

said current-limiting means is a resistor.

18. An electrical system as recited in claim 16, wherein:

said blocking means and said second blocking means are diodes; and

said current-limiting means and said second current-limiting means are resistors.

19. An electrical system as recited in claim 17, wherein said engine cranking motor and said generator are integrated as a single component.

20. An electrical system as recited in claim 18, wherein said engine cranking motor and said generator are integrated as a single component.