Fuel injection amount control system for internal combustion engine

#1. Field of the Invention:

#The present invention relates to a fuel injection control system for an internal combustion engine. More specifically, the invention relates to a fuel injection system for compensating fuel transportation lag, of a fuel transportation system, which transports fuel injected from a fuel injection valve to a cylinder of an internal combustion engine.

#2. Related Background Art:

#The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which:

#FIG. 1 is a schematic configuration diagram of an entire engine control system as a first embodiment of the invention;

#FIG. 2 is a flowchart showing the flow processes of a fuel correction amount computing program;

#The following description of preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

#A first embodiment of the invention will be described below with reference to FIGS. 1 through 4. First, the schematic configuration of an entire engine control system will be described by referring to FIG. 1. In the uppermost stream portion of an intake pipe 12 of internal combustion engine 11, an air cleaner 13 is provided. On the downstream side of the air cleaner 13, an air flow meter 14 for detecting an intake air volume is provided. On the downstream side of the air flow meter 14, a throttle valve 15 and a throttle angle sensor 16, for sensing a throttle angle, are provided. A surge tank 17 is provided downstream of the throttle valve 15, and the surge tank 17 is provided with an intake manifold pressure sensor 18 for sensing an intake manifold pressure Pm. The surge tank 17 is also provided with an intake manifold 19 for introducing air into all cylinders of the internal combustion engine 11. A fuel injection valve 20, for injecting fuel, is attached near the intake port of the intake manifold 19 of each cylinder.

#At some point within the length of an exhaust pipe 21 of the engine 11, a catalyst 22 is disposed. The catalyst 22 may be a three-way catalyst for reducing CO, HC, NOx, and the like, in an exhaust gas. On the upstream side of the catalyst 22, an air-fuel ratio sensor 23 is provided for sensing the air-fuel ratio or a rich/lean state of the exhaust gas. To a cylinder block of the engine 11, a cooling water temperature sensor 24 for sensing a cooling water temperature Thw and a crank angle sensor 25 for sensing engine speed Ne are attached.