초록 ▼

A fuel transfer model of a fuel supply system is used to set and control the fuel pump of a return less fuel injection system. The model simulates characteristics of the fuel pump, fuel pressure transfer delay of fuel supply conduits and fuel pressure variation characteristics such as caused by expa

A fuel transfer model of a fuel supply system is used to set and control the fuel pump of a return less fuel injection system. The model simulates characteristics of the fuel pump, fuel pressure transfer delay of fuel supply conduits and fuel pressure variation characteristics such as caused by expansion and compression of the fuel supply conduit volume due to an elastic coefficient and the like. The fuel pump model simulates a torque applied to the fuel pump motor, inertia, and the relationships between pump rotational speed, fuel pressure and fuel pump discharge amounts. A compensation control arithmetic calculation model may be derived from inverse calculation based on this fuel transfer model. The compensating current obtained from such an arithmetic model provides compensation for control of the fuel pump by adding a first value obtained by waveform shaping (through a first differentiation of the fuel injection amount) and a second value obtained by waveform shaping (through a second differentiation of the fuel injection amount).

대표청구항 ▼

[ What is claimed is:] [1.]1. Fuel supply apparatus for an internal combustion engine, said apparatus comprising:a fuel pump for transferring fuel to fuel injectors; andfuel pump control means for adjusting fuel pressure fed to said injectors by controlling said fuel pump,wherein said fuel pump cont

[ What is claimed is:] [1.]1. Fuel supply apparatus for an internal combustion engine, said apparatus comprising:a fuel pump for transferring fuel to fuel injectors; andfuel pump control means for adjusting fuel pressure fed to said injectors by controlling said fuel pump,wherein said fuel pump control means includes:basic control amount calculating means for calculating a basic control amount tending to cause fuel pressure to become equal to a target fuel pressure;compensation amount calculating means for continuously calculating in real time a compensation amount for compensating delayed response of the fuel supply system depending on the difference between a first-order delay of a fuel injection amount and an actual fuel injection amount and using a single mathematical algorithm whether or not the amount of fuel being consumed by the injectors is in a transient state; andcontrol amount calculating means for calculating a fuel pump control amount depending on said basic control amount and said compensation amount.