US Patent 7255080 Spark plug heating for a spark ignited engine

A system for an engine of a vehicle, comprising of at least one combustion chamber located in the engine, a delivery system configured to deliver a fuel and a fluid to the combustion chamber, an ignition system including a spark plug configured to ignite the fuel within the combustion chamber, a spark plug heating system configured to supply heat to the spark plug, and a control system configured to vary an amount of heat supplied to the spark plug by the spark plug heating system responsive to a condition of the ignition system.