Capacitor-based powering system and associated methods

• US 7,095,135 B2
• Filed: 12/09/2003
• Issued: 08/22/2006
• Est. Priority Date: 10/10/2000
• Status: Expired due to Term

• Current Assignee: Sure Power Industries, Inc. (Eaton Corporation PLC.)
• Original Assignee: Purkey's Electrical Consulting, Inc.
• Inventors: Purkey, Bruce, Smith, Carl
• Primary Examiner(s): Deberadinis, Robert L.
• Application Number:
  US10/731,706
• Publication Number:
  US 20040119338A1
• Time in Patent Office: 987 Days
• Field of Search: 307/10.6, 307/10.1, 123/179.3, 290/38.R, 320/103, 320/127
• US Class Current: 307/10.6
• CPC Class Codes: F02N 11/14 Starting of engines by means of electric starters with external current supply F02N11/12 takes precedence
• CPC Class Codes: H01M 10/4264 with capacitors
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 50/202 Casings or frames around the primary casing of a single cell or a single battery
• CPC Class Codes: H01M 50/204 Racks, modules or packs for multiple batteries or multiple cells
• CPC Class Codes: H01M 50/249 specially adapted for aircraft or vehicles, e.g. cars or trains constructional details of batteries specially adapted for electric vehicles B60L50/64
• CPC Class Codes: H01M 6/5033 used as charging means for another battery
• CPC Class Codes: H02J 1/122 Provisions for temporary connection of DC sources of essentially the same voltage, e.g. jumpstart cables
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A system, capacitor having auxiliary cells, and associated methods for starting an engine is provided. The capacitor is an enhanced-power capacitor that provides enhanced cranking power. The capacitor is isolated from the battery and the rest of the engine'"'"'s electrical system at preselected times. The capacitor is electrically connected to the alternator when the engine is running and is charged by the alternator. When the engine is not running, the capacitor is electrically isolated to prevent the capacitor discharging by powering accessory devices; the battery can power devices while the capacitor remains electrically isolated. During starting, the capacitor provides all the power supplied to the starter solenoid. If the battery is too weak to energize the electrical system during starting, an override allows the capacitor to provide power for all starting functions.

Claims

1. A user-actuated ignition system for starting an internal combustion engine in a vehicle, the system comprising:

a starter responsive to the user and having an electrically driven motor to crank the engine;

an alternator; and

an n-celled high-density capacitor electrically connected to the starter to provide power for driving the motor of the starter and thereby enabling the starter to crank the engine and connected to the alternator for receiving power from the alternator when the alternator is generating electrical current, the number of cells, n, corresponding to the amount of power delivered from the alternator to the capacitor.

2. A system as defined in claim 1, wherein (10+i)th cell, i≧

1, provides an incremental power increase of greater than about one and ninety six hundredths (1.96) times the product of the capacitance, C, of the capacitor and the total number of cells, n.

3. A system as defined in claim 2, wherein power, p, is determined by the product 0.98 times the capacitance of the capacitor times the square of the number of cells employed in the system, according to the formula p=0.98(C)(n²)watts, where C is the capacitance of the capacitor and n is the number of cells.

4. An internal combustion engine starting system comprising:

a starter to crank the engine when engaged;

an alternator mechanically connected to the engine to convert mechanical energy generated by the engine when the engine is operatively functioning into electrical energy;

a capacitor electrically connected to each of the starter and the alternator to provide power to the starter and receive power from the alternator, the capacitor having at least eleven cells which readily provides a voltage greater than 14.6 volts during normal operating conditions; and

a power delivery controller electrically connected to the capacitor and responsive the starter to prevent power from being delivered by the capacitor to the starter and permit power to be delivered to the capacitor from the alternator when the starter is disengaged and the alternator is operatively generating electrical current such that the energy level of the capacitor is maintained within a predetermined range while permitting power to be delivered to the starter when the starter is engaged.

5. A system as defined in claim 4, wherein the capacitor provides at least fifteen volts (15.0V) under normal operating conditions to thereby generate more than six kilowatts of power (6 kW) to the starter.

6. A system as defined in claim 4, wherein the power delivery controller comprises a transistor responsive to an electrical signal supplied by the alternator when the alternator is generating electrical current, the transistor closing in response to the electrical system to permit power to be delivered to the capacitor from the alternator when the starter is disengaged and the alternator is operatively generating electrical current such that the energy level of the capacitor is maintained within a predetermined range.

7. A system as defined in claim 6, wherein the power delivery controller comprises a magnetic switch responsive to an electrical signal supplied by the alternator when the alternator is generating electrical current, the magnetic switch closing in response to the electrical system to permit power to be delivered to the capacitor from the alternator when the starter is disengaged and the alternator is operatively generating electrical current such that the energy level of the capacitor is maintained within a predetermined range.

8. A method for selectively providing power to an electrical system associated with an internal combustion engine connected to a starter, an alternator, and a battery, the method comprising:

supplying power from a capacitor to the starter when the engine is being started, the capacitor having at least eleven cells, defining an enhanced-power capacitor, to thereby readily provide a voltage greater than 14.6 volts during normal operating conditions;

preventing delivery of power from the enhanced-power capacitor to the electrical system when the engine is not being started; and

providing power from the alternator to the enhanced-power capacitor when the engine is running.

9. A method as defined in claim 8, wherein the step of supplying power to the starter comprises generating more than six kilowatts of power (6 kW) to the starter by providing a voltage with the enhanced-power capacitor of at least fifteen volts (15.0V) under normal operating conditions.

10. A method as defined in claim 8, wherein the step of providing power from the alternator to the capacitor when the engine is running comprises providing a closed conductive path between the alternator and the capacitor, the path being established in response to a current generated by the alternator.

11. A method as defined in claim 10, wherein the step of providing power from the alternator to the capacitor comprises providing a capacitor having a voltage level sufficient to deliver enough power to the starter to crank the engine and be recharged directly by the alternator.

12. A method as defined in claim 11, wherein the step of providing power from the alternator to the capacitor comprises providing a capacitor having n cells wherein each cell provides an incremental increase in power of the product one and ninety six hundredths times the capacitance of the capacitor, C, and the number of cells, n, as represented by the expression 1.96(C)(n).

13. A method as defined in claim 10, wherein the step of providing power from the alternator to the capacitor further comprises stepping-up the voltage between the capacitor and the alternator such that the voltage is at least about fifteen volts (15.0V) and less than about 17.8 volts (17.8V).

14. A method as defined in claim 10, wherein the step of preventing delivery of power from the capacitor to the electrical system comprises electrically isolating the capacitor from the electrical system.

15. A method as defined in claim 14, wherein the step of preventing delivery of power by isolating the enhanced-power capacitor comprises providing a transistor that is connected to the enhanced-power capacitor and that provides an open electrical connection when the engine is not running.

16. A method as defined in claim 14, wherein the step of preventing delivery of power by isolating the enhanced-power capacitor comprises providing a magnetic switch that is connected to the enhanced-power capacitor and that provides an open electrical connection when the engine is not running.

17. A method as defined in claim 8, further comprising selectively supplying power from the capacitor to the electrical system.

18. A method as defined in claim 17, wherein the step of selectively supplying power from the capacitor to the electrical system is performed by the user when the power available to the electrical system from the battery is insufficient to perform a function otherwise powered by the electrical system.