Method and apparatus for providing supplemental power to an engine

1. A portable jump starter for delivering supplemental power to an engine comprising:

a pair of conductive leads for temporarily connecting the jump starter to an electrical system of the engine;

one or more jump starter batteries;

one or more jump starter capacitors connected in parallel to said one or more jump starter batteries;

a relay connected to said conductive leads;

a shunt cable connecting said jump starter batteries and said jump starter capacitors to said relay;

a switch coupled to said relay to selectively apply electrical power from said jump starter batteries and said jump starter capacitors to said electrical system of the engine; and

circuitry coupled to said relay to disconnect said jump starter batteries and said jump starter capacitors from said electrical system of the engine upon detection of a completed start cycle of the engine.

2. The jump starter of claim 1 further comprising a voltage sensor for measuring the voltage level of said one or more jump starter batteries and said one or more capacitors.

3. The jump starter of claim 1 further comprising a voltage sensor coupled to said one or more capacitors for detecting an over voltage condition of said one or more capacitors.

4. The jump starter of claim 1 further comprising a reverse voltage sensor for measuring the difference between the voltage level of said one or more jump starter batteries and said one or more capacitors and the voltage level of the electrical system.

5. The jump starter of claim 1 further comprising a relay voltage sensor for measuring the voltage across said relay.

6. The jump starter of claim 1 further comprising a battery temperature sensor for measuring the temperature of said one or more jump starter batteries.

7. The jump starter of claim 1 further comprising a shunt cable temperature sensor for measuring the temperature of said shunt cable.

8. The jump starter of claim 1 further comprising a sensor for measuring the current through said shunt cable.

9. The jump starter of claim 1 further comprising a sensor for measuring the voltage across said shunt cable.

10. The jump starter of claim 1 wherein said switch is a processor.

11. The jump starter of claim 10 further comprising a display coupled to said processor to provide instructions and status information about said jump starter.

12. The jump starter of claim 10 further comprising a plurality of indicators coupled to said processor to provide status information.

13. The jump starter of claim 10 further comprising a keypad coupled to said processor for providing input to said processor and controlling operational access to the jump starter.

14. The jump starter of claim 1 further comprising a thermal switch coupled to said shunt cable and electrically coupled to said relay, whereas if a temperature of said shunt cable exceeds a predetermined limit, said thermal switch interrupts power to said relay thereby electrically disconnecting said conductive leads from said system batteries.

15. The jump starter of claim 1 further comprising a voltage output selector coupled to said one or more jump starter batteries and said one or more capacitors for selectively providing a voltage output of 12, 18, 24, 30, 36, 42 or 48 volts.

16. The jump starter of claim 1 further comprising a diode connected across said relay to permit charging of said one or more jump starter batteries and said one or more capacitors by said electrical system.

17. The jump starter of claim 1 wherein said detection of a completed start cycle of the engine comprises measuring a drop in current through said shunt cable and comparing to a predetermined threshold.

18. The jump starter of claim 17 wherein said predetermined threshold is approximately 20 percent of an original value.

19. The jump starter of claim 1 wherein said circuitry coupled to said relay comprises a sensor for measuring a current through said sensor.