RESONANCE BOOSTED IGNITION VOLTAGE

• US 20200109692A1
• Filed: 10/03/2018
• Published: 04/09/2020
• Est. Priority Date: 10/03/2018
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: CRESS, James, NEAVILLE, Andrew
• Granted Patent: US 10,641,233 B2
• Time in Patent Office: Days
• CPC Class Codes: F02D 2041/2013 by using a boost voltage source
• CPC Class Codes: F02D 2041/2051 using voltage control
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils
• CPC Class Codes: F02P 17/12 Testing characteristics of the spark, ignition voltage or current testing of sparking plugs H01T13/60
• CPC Class Codes: F02P 3/00 Other installations
• CPC Class Codes: F02P 3/005 having inductive-capacitance energy storage capacitive storage installations using an intermediate charging inductance F02P3/0876
• CPC Class Codes: F02P 3/05 for control of the magnitude of the current in the ignition coil during starting F02P15/12
• CPC Class Codes: F02P 9/002 Control of spark intensity, intensifying, lengthening, suppression by means of current control in the storage devices F02P3/05, F02P3/09, during starting F02P15/12
• CPC Class Codes: G01R 19/16528 using digital techniques or performing arithmetic operations using digital techniques to measure a voltage or a current, see G01R19/25
• CPC Class Codes: H01T 13/40 structurally combined with other devices combined or associated with fuel injectors F02M57/06; structurally combined with other parts of internal-combustion engines F02P13/00

Abstract

A device may determine a timing configuration for an ignition system. The device may pulse a driver to apply a set of resonant voltage pulses to the ignition system. The set of resonant voltage pulses may cause a set of increasing peak voltages. At least one peak voltage, of the set of increasing peak voltages, may satisfy a threshold to cause a spark in a spark plug of the ignition system.

Claims

1. A machine, comprising:

a natural gas engine;

an ignition system; and

one or more processors configured to;

cause a first current to be provided to a coil of the ignition system,

wherein the first current is configured to cause a first voltage that does not satisfy a threshold voltage to cause a spark in a spark plug of the ignition system; and

cause, after a gap period, a second current to be provided to the coil of the ignition system to cause the spark in the spark plug of the ignition system,

wherein the gap period is configured to cause a resonant effect on the first voltage,

wherein the second current is configured to cause a second voltage that satisfies the threshold voltage based on the resonant effect on the first voltage.

2. The machine of claim 1, wherein the second current is greater than the first current.

3. The machine of claim 1, wherein the first voltage and the second voltage are secondary voltages.

4. The machine of claim 1, wherein the second voltage is a positive voltage;

and

wherein the second current is provided, when a voltage of the ignition system is increasing, to cause a resonant effect.

5. The machine of claim 1, wherein the threshold voltage is greater than approximately 40 kilovolts.

6. The machine of claim 1, wherein the one or more processors are further configured to determine a timing for the gap period based on stored information.

7. The machine of claim 1, further comprising:

a sensor to determine a state of the ignition system.

8. The machine of claim 7, wherein the one or more processors are further configured to determine a timing for the gap period based on measurement information, received from the sensor, identifying the state of the ignition system.

9. The machine of claim 1, wherein the first current is a first current pulse associated with a first amount of time and the second current is a second current pulse associated with a second amount of time, and

wherein the second amount of time is greater than the first amount of time.

10. The machine of claim 1, wherein the resonant effect is a sinusoidal resonance effect.

11. A method comprising:

determining, by a processor, a timing configuration for an ignition system; and

pulsing, by the processor, a driver to apply a set of resonant voltage pulses to the ignition system,

wherein the set of resonant voltage pulses cause a set of increasing peak voltages, and

wherein at least one peak voltage, of the set of increasing peak voltages, satisfies a threshold to cause a spark in a spark plug of the ignition system.

12. The method of claim 11, wherein pulsing the driver comprises:

causing the driver to provide a first current pulse corresponding to a first voltage pulse of the set of resonant voltage pulses;

pausing for a threshold period of time; and

causing the driver to provide a second current pulse corresponding to a second voltage pulse of the set of resonant voltage pulses after pausing for the threshold period of time.

13. The method of claim 12, wherein the second voltage pulse is a negative voltage;

and

wherein the second voltage pulse is provided, when a voltage of the ignition system is decreasing, to cause a resonant effect.

14. The method of claim 12, wherein the second voltage pulse causes a voltage of the ignition system to be of a greater magnitude than a maximum voltage achievable by a single current pulse of the driver.

15. The method of claim 11, wherein the set of resonant voltage pulses includes three or more voltage pulses.

16. The method of claim 11, wherein the set of resonant voltage pulses includes four or more voltage pulses.

17. An engine control system, comprising:

a memory; and

one or more processors configured to;

cause a first current to be provided to a coil of an ignition system of an engine at a first time selected based on a first state of the engine,

wherein the first current is configured to cause a first voltage that does not satisfy a threshold voltage to cause a spark in a spark plug of the ignition system; and

cause, after a gap period and at a second time selected based on a second state of the engine and a configuration parameter relating to the first voltage, a second current to be provided to the coil of the ignition system to cause the spark in the spark plug of the ignition system,

wherein the gap period is configured to cause a resonant effect on the first voltage,

wherein the second current is configured to cause a second voltage that satisfies the threshold voltage based on the resonant effect on the first voltage.

18. The engine control system of claim 17, wherein the one or more processors are configured to determine the gap period based at least in part on stored information identifying a timing associated with the resonant effect.

19. The engine control system of claim 17, wherein the first current and the second current are a common current.

20. The engine control system of claim 17, wherein the first current is greater than the second current.