Current Profile Optimization

An ignition controller comprising:

• an input;
• an output;
• memory storing instructions that are executable;
• and
• one or more processing devices to execute the instructions to perform operations comprising:
• receiving, at the input, a plurality of measurements of electric current amplitude in a primary winding of an engine ignition system comprising the primary winding and a spark plug;
• identifying an ignition start time;
• identifying an inflection point based on the plurality of measurements;
• determining an inflection point time representative of a time at which the identified inflection point occurred;
• determining a spark start time based on an amount of time between the ignition start time and the inflection point time;
• and
• providing, at the output, a signal indicative of the spark start time.

An engine system comprising:

• an engine;
• an engine ignition system comprising a primary winding and a spark plug;
• and
• an ignition controller comprising:
• an input;
• an output;
• memory storing instructions that are executable;
• and
• one or more processing devices to execute the instructions to perform operations comprising:
• receiving, at the input, a plurality of measurements of electric current amplitude in a primary winding of an engine ignition system comprising the primary winding and a spark plug;
• identifying an ignition start time;
• identifying an inflection point based on the plurality of measurements;
• determining an inflection point time representative of a time at which the identified inflection point occurred;
• determining a spark start time based on an amount of time between the ignition start time and the inflection point time;
• and
• providing, at the output, a signal indicative of the spark start time.