초록 ▼

During operation of a spark ignition engine, an ignition system produces an output (e.g., breakdown voltage, peak secondary coil current, and spark duration) used to combust a charge (e.g., mixture of air and fuel) in an engine cylinder. Ignition output is important to consider in engines including

During operation of a spark ignition engine, an ignition system produces an output (e.g., breakdown voltage, peak secondary coil current, and spark duration) used to combust a charge (e.g., mixture of air and fuel) in an engine cylinder. Ignition output is important to consider in engines including a second fuel with high ignitability, for example in engines with a fuel reformer system. Example methods, devices and systems are included for adjusting ignition output.

대표청구항 ▼

1. A method for an engine, the method comprising: adjusting a reformate amount in a cylinder of the engine, the engine coupled to a fuel reformer system, the adjusting based on a spark duration of a spark plug included in an ignition system of the engine, the spark plug coupled to the cylinder; andd

1. A method for an engine, the method comprising: adjusting a reformate amount in a cylinder of the engine, the engine coupled to a fuel reformer system, the adjusting based on a spark duration of a spark plug included in an ignition system of the engine, the spark plug coupled to the cylinder; anddecreasing a percent of EGR in an intake charge relative to fresh air in response to at least one of the spark duration below a spark duration threshold, a spark voltage below a voltage threshold and a secondary peak current below a current threshold. 2. The method of claim 1, where the reformate amount is produced by an onboard reformer reforming an ethanol fuel. 3. A method for an engine, the method comprising: adjusting a reformate amount in a cylinder of the engine, the engine coupled to a fuel reformer system, the adjusting based on a spark duration of a spark plug included in an ignition system of the engine, the spark plug coupled to the cylinder; andfurther comprising decreasing boost in response to at least one of the spark duration below a spark duration threshold, a breakdown voltage below a breakdown threshold and a peak secondary current below a current threshold. 4. The method of claim 3, where the reformate amount is produced by an onboard reformer reforming an ethanol fuel. 5. A method for an engine and a fuel reformer, comprising: adjusting a spark duration of a spark plug included in an ignition system, the spark plug coupled to a cylinder of the engine, the adjusting based on a reformate amount in a storage tank and engine speed. 6. The method of claim 5, wherein the storage tank is coupled to the fuel reformer, the method further comprising increasing the spark duration in response to the reformate amount below a reformate threshold, and decreasing the spark duration in response to the reformate amount above the reformate threshold. 7. The method of claim 6 further comprising decreasing reformate concentration in the cylinder in response to the reformate amount below the reformate threshold. 8. The method of claim 5, further comprising increasing at least one of a breakdown voltage and a peak secondary current in the spark plug in response to a charge motion above a charge motion threshold. 9. The method of claim 5, further comprising increasing at least one of a breakdown voltage and a peak secondary current in the spark plug in response to a cylinder pressure above a cylinder pressure threshold. 10. The method of claim 5, further comprising increasing the spark duration in response to an engine speed-load below a speed-load threshold. 11. The method of claim 5, further comprising increasing the spark duration in response to a charge dilution above a dilution threshold. 12. The method of claim 5, where the reformate amount is produced by an onboard reformer.