Stratified scavenging two-cycle engine

A stratified, scavenging, two-cycle engine having a cylinder chamber and a crank chamber, the engine comprising:

• a fluid flow passage extending between the cylinder chamber and the crank chamber;
• an air flow passage, in fluid communication with the fluid flow passage, to introduce air to the fluid flow passage;
• an air flow controller to control a quantity of air introduced from the air flow passage to the fluid flow passage;
• and
• a fuel mixture controller to control a quantity of a fuel mixture provided to the crank chamber from a coupled fuel mixture flow passage,
• wherein at engine acceleration, the air flow controller controls the quantity of air introduced from the air flow passage to the fluid flow passage after delaying such introduction a prescribed time after a fuel mixture is drawn into the crank chamber.

A method for controlling an introduction of a fuel mixture and an introduction of air to a stratified, scavenging, two-cycle engine, the method comprising the steps of:

• providing an engine having a fluid flow passage extending between a cylinder chamber and a crank chamber, and an air flow passage, in fluid communication with the fluid flow passage, to introduce air to the fluid flow passage;
• controlling a flow rate of a fuel mixture drawn into the crank chamber;
• controlling a flow rate of air introduced to the fluid flow passage;
• and
• detecting an engine acceleration,
• wherein upon detecting an engine acceleration, reducing the flow rate of air introduced to the fluid flow passage for a prescribed time.