Internal combustion engine start control device and control method

An internal combustion engine start control device for starting an internal combustion engine by cranking the internal combustion engine by an electric motor, comprising:

• means for performing a feedback-control of an intake air amount of the internal combustion engine to a target idle intake air amount;
• means for learning a feedback correction amount applied in a feedback control;
• and
• means for performing a learning control of the intake air amount using a learnt value in parallel with the feedback control;
• wherein the feedback correction amount is limited by an allowable correction range, and
• wherein,
• before a start of learning, a first allowable correction range is set as the allowable correction range,
• while the learning is being performed, a second allowable correction range is set as the allowable correction range, and
• after the learning is completed, a third allowable correction range is set as the allowable correction range,
• wherein the second allowable correction range is wider than the first allowable correction range, and the first allowable correction range is wider than the third allowable correction range.

An internal combustion engine start control method for starting an internal combustion engine by cranking the internal combustion engine by an electric motor, comprising:

• performing a feedback-control of an intake air amount of the internal combustion engine to a target idle intake air amount;
• learning a feedback correction amount applied in the feedback control;
• and
• performing a learning control of the intake air amount using a learnt value in parallel with the feedback control;
• wherein the feedback correction amount is limited by an allowable correction range, and
• wherein,
• before a start of learning, a first allowable correction range is set as the allowable correction range,
• while the learning is being performed, a second allowable correction range is set as the allowable correction range, and
• after the learning is completed, a third allowable correction range is set as the allowable correction range,
• wherein the second allowable correction range is wider than the first allowable correction range, and the first allowable correction range is wider than the third allowable correction range.