Diagnosing and remediating fuel injection drift utilizing fuel rail pressure measurements

A kit of parts for a fuel injection system of an internal combustion engine comprising a primary fuel injector and at least one secondary fuel injector, the kit of parts comprising:

• a sensor configured to be coupled to a primary fuel injector of the internal combustion engine, the sensor configured to detect a pressure drop of fuel upstream of the primary fuel injector upon each injection cycle of the primary fuel injector;
• a controller for controlling the fuel injection system, the controller configured to:
• receive data indicative of a changes in the pressure drop for a plurality of injection cycles for only the primary fuel injector;
• determine a fuel quantity drift parameter over the plurality of injection cycles based on the data indicative of the changes in the pressure drop over the plurality of injection cycles of the primary fuel injector;
• determine a secondary fuel quantity drift parameter for the at least one secondary fuel injector based at least in part on the changes in the pressure drop over the plurality of injection cycles of the primary fuel injector;
• and
• adjust a fuel quantity delivered by the primary fuel injector and each secondary fuel injector based on the fuel quantity drift parameter and the secondary fuel quantity drift parameter;
• wherein the controller is configured to calculate a moving average based on the data indicative of the changes in the pressure drop over the plurality of injection cycles for the primary fuel injector;
• wherein the controller is configured to determine the fuel quantity drift parameter based on the moving average;
• and
• wherein the controller is configured to determine the secondary fuel quantity drift parameter for the at least one secondary fuel injector based at least in part on the moving average.

A method of controlling a fuel injection system of an internal combustion engine comprising:

• injecting fuel into an ignition chamber of the internal combustion engine using a primary fuel injector for a plurality of injection cycles of the primary fuel injector,
• detecting, via a sensor coupled to the primary fuel injector, a pressure drop of the fuel upstream of the primary fuel injector upon each injection cycle of the primary fuel injector;
• injecting fuel into a respective ignition chamber of the internal combustion engine using at least one secondary fuel injector;
• receiving data at a controller, the data indicative of changes in the pressure drop for the plurality of injection cycles for only the primary fuel injector;
• calculating a moving average based on the data indicative of the changes in the pressure drop over the plurality of injection cycles for the primary fuel injector;
• determining a fuel quantity drift parameter based on the moving average;
• determining a secondary fuel quantity drift parameter for the at least one secondary fuel injector based at least in part on the moving average;
• and
• adjusting a fuel quantity delivered by the primary fuel injector and each secondary fuel injector based on the fuel quantity drift parameter and the secondary fuel quantity drift parameter.