초록 ▼

A diesel engine has a fuel injection nozzle to which pressurized fuel is supplied from a pump. The nozzle has a pressure sensor detecting the fuel pressure and a lift sensor sensing a lift magnitude of a needle valve. An electronic control unit (ECU) computes a variation ratio of the fuel pressure v

A diesel engine has a fuel injection nozzle to which pressurized fuel is supplied from a pump. The nozzle has a pressure sensor detecting the fuel pressure and a lift sensor sensing a lift magnitude of a needle valve. An electronic control unit (ECU) computes a variation ratio of the fuel pressure value which is measured by the pressure sensor. The ECU computes a non-increasing point in an increasing part of variation ratio and judges the point to be a timing for starting the fuel injection of the nozzle. The EPU also computes the actual fuel injection amount in accordance with the fuel injection timing as well as the fuel pressure and the lift amount of the needle valve both at the various points. The EPU controls the actual injection amount to be identical to a target fuel injection amount.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injection control apparatus for a combustion engine comprising:a) a nozzle for injecting fuel into the engine, said nozzle having a valve opened in response to a fuel pressure which is greater than or equal to a predetermined pressure;b) a pump for supplying the fu

[ What is claimed is:] [1.] A fuel injection control apparatus for a combustion engine comprising:a) a nozzle for injecting fuel into the engine, said nozzle having a valve opened in response to a fuel pressure which is greater than or equal to a predetermined pressure;b) a pump for supplying the fuel to the nozzle;c) means for detecting actual fuel pressure by measuring an opening valve pressure when the nozzle is opened;d) means for computing an opening valve pressure deviation between said actual opening valve pressure and reference opening valve pressure; ande) means for computing a remaining fuel amount change value between the pump and the nozzle using said opening valve pressure deviation;f) means for setting a target fuel amount for a next injection of said nozzle in accordance with said remaining fuel amount change value; andg) means for controlling the pump operation based on said target fuel amount.