US 9,175,627 B2 · Fuel injection control apparatus for an internal combustion engine

Abstract

A fuel injection control apparatus for controlling an amount of fuel injection into a fuel injection port of an intake passage in an internal combustion engine, the fuel injection control apparatus including an exhaust air-fuel ratio sensor configured to detect an exhaust air-fuel ratio, an exhaust temperature sensor configured to detect an exhaust temperature, an intake air flow meter configured to detect an intake air amount in the intake passage, and a controller configured to estimate a wall flow amount of the fuel injection port based on the fuel injection amount, the exhaust air-fuel ratio, and the intake air amount, estimate a catalyst bed temperature of a catalyst provided in an exhaust passage based on the exhaust air-fuel ratio and the exhaust temperature and to correct the estimated catalyst bed temperature in accordance with the wall flow amount, and control the fuel injection amount based on the catalyst bed temperature.

Claims14

Dependent claims

an exhaust air-fuel ratio sensor configured to detect an exhaust air-fuel ratio;
an exhaust temperature sensor configured to detect an exhaust temperature;
an intake air flow meter configured to detect an intake air amount in the intake passage;
and
a controller configured to:
detect a fuel cut or a rapid decrease in intake air amount;
estimate a wall flow amount of the fuel injection port based on the fuel injection amount immediately before the fuel cut or the rapid decrease in intake air amount, the detected exhaust air-fuel ratio, and the detected intake air amount;
estimate a catalyst bed temperature of a catalyst provided in an exhaust passage based on the detected exhaust air-fuel ratio and the detected exhaust temperature and to correct the estimated catalyst bed temperature in accordance with the wall flow amount;
and
control the fuel injection amount based on the catalyst bed temperature.

7 more elements

Dependencies are inferred from the claim text.

Fuel injection control apparatus for an internal combustion engine

Life of this patent

Fuel injection control apparatus for an internal combustion engine

Life of this patent

Abstract

Claims14