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Systems and methods for controlling an internal combustion engine include an ignition coil that generates a pre-discharge ionization signal during charging of the ignition coil after reaching a first threshold charge level and prior to spark discharge and a controller that determines an engine opera

Systems and methods for controlling an internal combustion engine include an ignition coil that generates a pre-discharge ionization signal during charging of the ignition coil after reaching a first threshold charge level and prior to spark discharge and a controller that determines an engine operating condition, such as pre-ignition or plug fouling, in response to the pre-discharge ionization signal. The ignition coil may also generate digital feedback and ionization signals used to by the controller for to control ignition coil dwell and repetitive sparking, as well as providing various combustion diagnostics.

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1. A method for controlling an internal combustion engine having an ignition coil associated with at least one spark plug, the method comprising: generating a pre-discharge ionization signal during charging of the ignition coil after reaching a first threshold charge level and prior to spark dischar

1. A method for controlling an internal combustion engine having an ignition coil associated with at least one spark plug, the method comprising: generating a pre-discharge ionization signal during charging of the ignition coil after reaching a first threshold charge level and prior to spark discharge;determining engine operating condition in response to the pre-discharge ionization signal;generating a first digital feedback signal in response to a coil charging signal until the ignition coil reaches the first threshold charge level, the first threshold charge level being less than a spark discharge charge level;generating a second digital feedback signal in response to the ignition coil being above the spark discharge charge level and no charging signal being present;controlling number and duration of repetitive spark discharges during a single combustion cycle in a single cylinder in response to at least the first and second digital feedback signals;transmitting the first and second digital feedback signals by a common wire; anddetermining operating condition of the at least one spark plug associated with the second ignition coil in response to the pre-discharge ionization signal on the common wire, wherein generating a pre-discharge ionization signal includes generating a third digital signal in the first ignition coil to mask the pre-discharge ionization signal. 2. The method of claim 1 further comprising: generating a combustion ionization signal after the second digital feedback signal; andprocessing the combustion ionization signal to determine combustion quality. 3. The method of claim 1 further comprising: determining misfire in response to the pre-discharge ionization signal and a second ionization signal occurring after the second digital feedback signal. 4. The method of claim 1 comprising: determining fouling of the plug associated with the second ignition coil in response to the pre-discharge ionization signal on the common wire exceeding the third digital signal level. 5. The method of claim 1 further comprising: determining fouling of the plug associated with the second ignition coil in response to the pre-discharge ionization signal on the common wire exceeding a corresponding plug fouling threshold. 6. A method for controlling an engine, comprising: generating a pre-discharge ionization signal, a first digital feedback signal until an ignition coil reaches a first threshold charge, and a second digital feedback signal in response to the ignition coil being above a spark discharge charge and no charging signal present;controlling number and duration of repetitive spark discharges during a single combustion cycle in a single cylinder in response to the digital feedback signals;transmitting the first and second ignition coil outputs together to provide corresponding feedback signals on a common wire; anddetermining operating condition of a spark plug associated with the second ignition coil in response to the pre-discharged ionization signal on the common wire, wherein determining operating condition of the spark plug includes generating a third digital signal in the first ignition coil to mask the pre-discharge ionization signal. 7. The method of claim 6 further comprising determining fouling of the plug associated with the second ignition coil in response to the pre-discharge ionization signal on the common wire exceeding the third digital signal level. 8. The method of claim 6 further comprising determining fouling of the plug associated with the second ignition coil in response to the pre-discharge ionization signal on the common wire exceeding a corresponding plug fouling threshold. 9. The method of claim 6 further comprising determining misfire in response to the pre-discharge ionization signal and a second ionization signal occurring after the second digital feedback signal.