Systems and methods of fuel injection timing drift detection and compensation

A method implemented by a computer system having one or more processors and memories, comprising:

• collecting a series of fuel pressure data;
• receiving an indication of fuel flow cutout;
• receiving a start-of-injection command signal;
• in response to receiving the indication of fuel flow cutout,
• calculating, by the one or more processors, a set of pressure drops using the series of fuel pressure data;
• comparing, by the one or more processors, the set of pressure drops with a predetermined threshold to identify a selected pressure drop greater than the predetermined threshold;
• determining, by the one or more processors, a measured start-of-injection timing based on the selected pressure drop;
• and
• evaluating, by the one or more processors, whether a fuel injection drifting occurs based on the received start-of-injection command signal and the determined start-of-injection timing.

A method implemented by a computer system having one or more processors and memories, comprising:

• collecting a series of crank synchronized fuel pressure data;
• receiving a start-of-injection command signal;
• calculating, by the one or more processors, a set of pressure drops using the series of crank synchronous fuel pressure data collected during a fuel flow cutout period;
• comparing, by the one or more processors, the set of pressure drops with a predetermined threshold to identify a selected pressure drop greater than the predetermined threshold;
• determining, by the one or more processors, a measured start-of-injection timing based on the selected pressure drop;
• and
• evaluating, by the one or more processors, whether a fuel injection drifting occurs based on the received start-of-injection command signal and the measured start-of-injection timing.