Fuel supply control system for an internal combustion engine

摘要

An internal combustion engine has a combustion chamber and an air passage leading to the combustion chamber for conducting air to the combustion chamber. A throttle valve is disposed in the air passage for adjusting the rate of air flow into the combustion chamber. A compressor is disposed in the air passage at a point upstream of the throttle valve for compressing the air. A flow meter is disposed in the air passage at a point upstream of the compressor for sensing the rate of air flow through the air passage. Fuel is injected into the air passage at a point downstream of the throttle valve. The rate of fuel injection normally has a preset relationship with the sensed air flow rate. When the throttle valve is closed, the fuel injection rate is limited to no more than a predetermined level regardless of the preset relationship between the fuel injection rate and the sensed air flow rate. In the case of periodic fuel injection at a frequency proportional to engine speed, the amount of fuel injected during each fuel injection stroke may be limited to a predetermined level when the throttle valve is closed.