Fuel supply amount control apparatus for internal combustion engine
AssigneeDenso Corporation
InventorYoshihiro Majima
Life of this patent
Estimating the term…
Abstract
When control conditions are satisfied, an A/F value is estimated from an average value of rotation speed Ne and an increasing rotation speed ΔNe calculated. The estimated A/F value as a base is obtained from the average value of the rotation speed Ne, and a correction value for the estimated A/F value is obtained from the increasing rotation speed ΔNe. Then, a fuel increment/decrement correction coefficient γ and an air increment/decrement correction coefficient β are calculated, and used in the control of A/F ratio toward a target A/F value based on a final estimated A/F value.
Claims13
An internal combustion engine fuel supply amount control apparatus comprising:
- load detection means for detecting a load on an internal combustion engine;
- air-fuel ratio estimation means for estimating an air-fuel ratio of the internal combustion engine during a predetermined period based on the load on the internal combustion engine detected by the load detection means;
- fuel injection amount control means for controlling a fuel injection amount based on the air-fuel ratio estimated by the air-fuel ratio estimation means:
- wherein the load detection means includes rotation speed detection means for detecting a rotation speed of the internal combustion engine as the load on the internal combustion engine;
- variation amount calculation means for calculating a rotation speed variation amount based on the rotation speed detected by the rotation speed detection means;
- and
- average value calculation means for calculating a rotation speed average value based on the rotation speed during the predetermined period detected by the rotation speed detection means,
- wherein the air-fuel ratio estimation means estimates the air-fuel ratio of the internal combustion engine based on the rotation speed variation amount calculated by the variation amount calculation means and the rotation speed average value calculated by the average value calculation means.
An internal combustion engine fuel supply amount control apparatus comprising:
- load detection means for detecting a load on an internal combustion engine;
- air-fuel ratio estimation means for estimating an air-fuel ratio of the internal combustion engine during a predetermined period based on the load on the internal combustion engine detected by the load detection means;
- fuel injection amount control means for controlling a fuel injection amount based on the air-fuel ratio estimated by the air-fuel ratio estimation means;
- and
- an air-fuel sensor is-provided in an exhaust passage of the internal combustion engine,
- wherein said predetermined period ranges from startup of the internal combustion engine to activation of the air-fuel sensor.
An internal combustion engine fuel supply amount control apparatus comprising:
- load detection means for detecting a load on an internal combustion engine;
- air-fuel ratio estimation means for estimating an air-fuel ratio of the internal combustion engine during a predetermined period based on the load on the internal combustion engine detected by the load detection means;
- fuel injection amount control means for controlling a fuel injection amount based on the air-fuel ratio estimated by the air-fuel ratio estimation means;
- target air-fuel ratio setting means for setting a target air-fuel ratio;
- and
- air-fuel ratio control means for controlling the air-fuel ratio estimated by the air-fuel ratio estimation means to follow the target air-fuel ratio set by the target air-fuel ratio setting means based on a deviation between the target air-fuel ratio and the air-fuel ratio.
An internal combustion engine fuel supply amount control apparatus comprising:
- rotation speed detecting means for detecting a rotation speed of the internal combustion engine;
- variation amount calculation means for calculating a rotation speed variation amount based on the rotation speed detected by the rotation speed detection means;
- average value calculation means for calculating a rotation speed average value based on the rotation speed during the predetermined period detected by the rotation speed detection means;
- air-fuel ratio estimation means for estimating an air fuel ratio of the internal combustion engine based on the rotation speed variation amount calculated by the variation amount calculation means and the rotation speed average value calculated by the average value calculation means;
- and
- fuel injection amount control means for controlling a fuel injection amount based on the air-fuel ratio estimated by the air-fuel ratio estimation means.
Dependencies are inferred from the claim text.