Internal combustion engine with an electronically controlled tumble control valve

(canceled)

(canceled)

A control method for an internal combustion engine including a cylinder, an ignition plug and an electronic control unit, the control method comprising:

• in a rotation speed region that is at least part of a lean-burn operation region, controlling, by the electronic control unit, a gas flow in the cylinder such that a gas flow speed around the ignition plug during ignition falls within a flow speed range, the flow speed range being determined based on at least one of an air-fuel ratio in the cylinder, an ignition energy that is supplied to the ignition plug, an EGR rate and an in-cylinder temperature, and the flow speed range when the air-fuel ratio in the cylinder is high is narrower than the flow speed range when the air-fuel ratio in the cylinder is low.

A control method for an internal combustion engine including a cylinder, an ignition plug and an electronic control unit, the control method comprising:

• in a rotation speed region that is at least part of a lean-burn operation region, controlling, by the electronic control unit, a gas flow in the cylinder such that a gas flow speed around the ignition plug during ignition decreases as an air-fuel ratio in the cylinder increases, as an ignition energy that is supplied to the ignition plug decreases, as an EGR rate increases, or as an in-cylinder temperature decreases.