System and method for tip-in knock compensation

A system for an engine of a vehicle traveling on the road, the system comprising:

• a cylinder of the engine;
• a turbocharger coupled to the engine;
• an emission control device coupled in an exhaust downstream of the cylinder;
• a first injector configured to directly inject into the cylinder and coupled in a cylinder of the engine;
• a second injector configured to inject into a port of the cylinder and coupled to a port of the cylinder;
• and
• a controller for delivering a mixture of water and methanol to the cylinder via the first injector, and in response to a driver pedal tip-in condition, increasing an amount of injection from the first injector during at least boosted conditions.

A method of controlling an engine, the method comprising:

• providing a fuel, and a mixture of methanol and water, to a cylinder of the engine;
• actively varying amounts of said fuel, and said methanol and water, in response to at least an operating condition;
• and
• boosting intake charge inducted into the cylinder via a turbocharger coupled to the engine;
• where during a transient operating condition, said amount of said mixture of said methanol and said water is increased to reduce a tendency for knock during a first condition, and a spark timing is retarded in response to engine knock during a second condition.