Method and system for correcting fuel injection amount

A system of correcting a fuel injection amount, the system comprising:

• a fuel injection controller that applies a current value for injecting a target fuel amount to an injector of a fuel pressure rail such that fuel is injected when a driving condition that does not require fuel injection is determined;
• a pressure signal analyzer that detects a pressure signal of the fuel pressure rail and determines a frequency analysis value of the detected pressure signal upon determining that fuel according to the target fuel amount is injected;
• a fuel difference calculator that determines a fuel amount difference corresponding to a difference value between a frequency analysis value for the determined target fuel amount and a reference frequency analysis value stored in a data storage in advance;
• and
• a fuel injection corrector that corrects the current value of the injector which is applied to inject the target fuel amount to remove the determined fuel amount difference.

A system of correcting a fuel injection amount, the system comprising a controller configured of:

• applying a current value for injecting a target fuel amount to an injector of a fuel pressure rail such that fuel is injected when a driving condition that does not require fuel injection is determined;
• detecting a pressure signal of the fuel pressure rail and determining a frequency analysis value of the detected pressure signal upon determining that the fuel according to the target fuel amount is injected;
• determining a fuel amount difference corresponding to a difference value between a frequency analysis value for the determined target fuel amount and a reference frequency analysis value stored in a data storage in advance;
• and
• correcting the current value of the injector which is applied to inject the target fuel amount to remove the determined fuel amount difference.