Fuel injection amount correction method for pressure boosting fuel injection apparatus

Abstract

A boosting unit (110) is provided in each fuel injection valve of the engine (1). The pressure of fuel supplied from the common rail (3) to the fuel injection valve is increased as required. The ECU (20) causes the low-pressure injection to be performed while the pressure-increasing unit (110) is in a non-operating state, and causes the high-pressure injection to be performed while the pressure-increasing unit (110) is in an operating state, and keeps the fuel pressure at an increased Pressure. Based on the result, the ECU (20) corrects the fuel injection period of the fuel injection valve. And, after the correction of the fuel injection period is completed, after the operation of the boosting unit is started, the fuel injection is performed before the fuel pressure reaches the boost pressure. Based on the result, the operation start timing of the boosting unit is adjusted.

Description

technical field [0001] The present invention relates to a method for correcting the fuel injection quantity in a fuel injection device when injecting fuel, and more particularly to a fuel injection quantity correction method for a supercharged fuel injection device comprising a supercharging device, and The pressure of the fuel supplied from the common rail is increased in the pressure fuel injection device, and the fuel is injected from the fuel injection valve. Background technique [0002] A so-called common rail fuel injection apparatus is well known, in which high-pressure fuel supplied from a fuel pump is stored in a common rail (accumulator), and the fuel is supplied to an in-cylinder fuel injection valve provided in each cylinder of an internal combustion engine to inject the fuel directly injected into the combustion chamber of each cylinder. [0003] In the common rail fuel injection equipment, the pressure in the common rail can be controlled to a given value, th...

AI Technical Summary

Problems solved by technology

Therefore, if the fuel injection amount in one cylinder deviates greatly from the fuel injection amount in another cylinder, it is difficult to determine whether the deviation is caused by the fuel injection valve or the booster device based only on the fuel injection amount

As a result, in the pressurized fuel injection apparatus, the deviation of fuel injection in each cylinder cannot be reduced, the property of exhaust gas is likely to be deteriorated, and vibration or noise is likely to occur when driving the vehicle

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