Internal combustion engine control device
Transmission shocks and idling defects such as engine racing and rough idling due to aging of a throttle opening area are prevented from occurring. An internal combustion engine control apparatus for controlling an internal combustion engine that has an air flow rate sensor for measuring a rate of air represented as an actual air rate, the air flowing into a cylinder, and a throttle valve for adjusting the rate of air, includes a throttle valve controlling section for controlling a throttle opening of the throttle valve to reach a preset throttle opening set depending on a target air rate for realizing a demand torque, and a throttle opening correcting section for correcting the preset throttle opening on the basis of the target air rate upon fuel cutoff that stops a fuel from being supplied to the internal combustion engine and of an actual air rate measured by the air flow rate sensor.
1. An internal combustion engine control apparatus for controlling an internal combustion engine that has an air flow rate sensor for measuring a rate of air represented as an actual air rate, the air flowing into a cylinder, and a throttle valve for adjusting the rate of air, the internal combustion engine control apparatus comprising:
a throttle valve controlling section for controlling a throttle opening of the throttle valve to reach a preset throttle opening set depending on a target air rate for realizing a demand torque; and
a throttle opening correcting section for correcting the preset throttle opening on a basis of the target air rate upon fuel cutoff that stops a fuel from being supplied to the internal combustion engine and of an actual air rate measured by the air flow rate sensor, wherein
the throttle opening correcting section corrects the preset throttle opening when a difference between the target air rate during the fuel cutoff and the actual air rate measured by the air flow rate sensor is equal to or larger than a preset value.
2. The internal combustion engine control apparatus according to claim 1 , wherein
the throttle opening correcting section corrects the preset throttle opening by correcting a relationship between the present throttle opening and an opening area on a basis of the target air rate during the fuel cutoff and the actual air rate measured by the air flow rate sensor.
3. The internal combustion engine control apparatus according to claim 1 , wherein
the throttle opening correcting section corrects the preset throttle opening in case a throttle opening of the throttle valve is smaller than a sonic opening where a speed of air flowing through the throttle valve becomes a speed of sound.
4. The internal combustion engine control apparatus according to claim 1 , wherein
a sonic opening where a speed of air flowing through the throttle valve is a speed of sound is preset; and
the throttle opening correcting section corrects the preset throttle opening in case a throttle opening of the throttle valve is smaller than the sonic opening.
5. The internal combustion engine control apparatus according to claim 1 , further comprising:
a sonic determining section for determining a sonic opening where a speed of air flowing through the throttle valve is a speed of sound is preset on a basis of a ratio of pressures before and after the throttle valve, wherein
the throttle opening correcting section corrects the preset throttle opening in case the sonic determining section determines that a sonic state is established.
6. The internal combustion engine control apparatus according to claim 1 , wherein
the throttle opening correcting section corrects the preset throttle opening in a direction to close the throttle valve in case an actual air rate measured by the air flow rate sensor, rather than the target air rate during the fuel cutoff, is larger than a preset value.
7. The internal combustion engine control apparatus according to claim 1 , wherein
in case exhaust gases of the internal combustion engine are returned to a position upstream of the throttle valve even if a difference between the target air rate during the fuel cutoff and an actual air rate measured by the air flow rate sensor is equal to or larger than a preset value, the throttle opening correcting section does not correct the preset throttle opening until the exhaust gases flowing through the throttle valve are eliminated.
8. The internal combustion engine control apparatus according to claim 7 , wherein
in case the exhaust gases of the internal combustion engine are returned to the position upstream of the throttle valve, the throttle opening correcting section corrects the preset throttle opening after the exhaust gases flowing through the throttle valve are eliminated.
9. The internal combustion engine control apparatus according to claim 1 , wherein
the throttle opening correcting section corrects the preset throttle opening on a basis of the target air rate during the fuel cutoff and an actual air rate measured by the air flow rate sensor when a vehicle incorporating the internal combustion engine is traveling at vehicle speeds equal to or higher than a preset vehicle speed.