Engine control method and engine control device

An engine control method of executing a cycle including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke in a combustion chamber of an engine, the method comprising:

• a fuel supply step in which an injector supplies fuel into the combustion chamber;
• and
• an ignition step in which a spark plug arranged in the combustion chamber makes a flame after the supply of the fuel to the combustion chamber and at a timing when a flow strength in the combustion chamber is greater than a predetermined value in the compression stroke during or before a post-mid stage where the compression stroke is divided into four stages of a pre-stage, a pre-mid stage, the post-mid stage, and a post-stage.