Fuel injection control apparatus for internal combustion engine

摘要

A fuel injection control apparatus for fuel injection at optimum timing in correspondence with level of gas flow velocity in an intake port upon intake stroke injection. A fuel injection valve is controlled so as to set a large majority (more than half) of an injection period to inject fuel during an intake stroke in respective cylinders within a period where intake port gas pressure is increased. Upon intake stroke injection, the fuel is injected at optimum timing in correspondence with the direction and the level of gas flow velocity in the intake port. Accordingly, the status of air-fuel mixture in a combustion chamber is excellent. It is possible to improve fuel consumption and to reduce exhaust emission.

主权项

1. A fuel injection control apparatus for an internal combustion engine, the internal combustion engine having an intake port which is connected to a plurality of cylinders and which is provided cylinder and a fuel injection valve which is provided at the intake port so as to inject fuel in the intake port, comprising:
a fuel injection computation unit communicated with the intake port that calculates an amount of fuel injected from the fuel injection valve based on a torque amount of the internal combustion engine and transmits an injection signal to the fuel injection valve at a predetermined fuel injection time, and an intake port pressure sensor configured to sense a gas pressure in the intake port; wherein the fuel injection computation unit transmits the injection signal to the fuel injection valve so as to set more than half of a period to inject the fuel during an intake stroke of the cylinder within a period where the gas pressure in the intake port is increased, and wherein each of the cylinders has an intake valve which is open during the intake stroke, and the gas pressure is sensed at least during the intake stroke.