초록 ▼

A controller for an internal combustion engine is disclosed that improves drivability by always stabilizing combustion. A combustion state is detected based on an engine speed fluctuation every cylinder, and whether combustion is stable is determined. When combustion is stable, whether the condition

A controller for an internal combustion engine is disclosed that improves drivability by always stabilizing combustion. A combustion state is detected based on an engine speed fluctuation every cylinder, and whether combustion is stable is determined. When combustion is stable, whether the condition of executing fuel stability deteriorating operation is satisfied is determined. When combustion is unstable or the condition of executing the fuel stability deteriorating operation is satisfied, a control item adapted to current operating state is selected from control items of ignition timing, ignition method, in-cylinder flow velocity, EGR rate, and air-fuel ratio, and a control is performed so that the combustion velocity and the combustion pressure are stabilized. In the ignition control method, a spark is made a plurality of times by a spark plug. In the control of the in-cylinder flow velocity, a gas flow velocity in a cylinder is increased by strengthening a swirl flow.

대표청구항 ▼

1. A controller for an internal combustion engine, comprising:combustion state detecting means for detecting a combustion state of an internal combustion engine; and combustion stabilizing control means for executing a combustion stabilizing control which controls at least the combustion velocity or

1. A controller for an internal combustion engine, comprising:combustion state detecting means for detecting a combustion state of an internal combustion engine; and combustion stabilizing control means for executing a combustion stabilizing control which controls at least the combustion velocity or combustion pressure to stabilize combustion when combustion detected by combustion detecting means is unstable.