Asymmetric fuel injection window and fuel metering window

A method comprising:

• receiving, by a multi-fuel injection system, a first fuel;
• receiving, by the multi-fuel injection system, a second fuel;
• controlling, by the multi-fuel injection system, a fuel injector to perform fuel injection, of at least one of the first fuel or the second fuel into a cylinder of an engine, during a fuel injection window;
• and
• controlling, by the multi-fuel injection system, the fuel injector to perform fuel metering, of the second fuel into a nozzle of the fuel injector while the fuel injector is not injecting either of the first fuel or the second fuel into the cylinder of the engine, during a fuel metering window that is asymmetric to the fuel injection window, wherein:
• the fuel injection window is delineated by a first crank angle of a crankshaft and a second crank angle of the crankshaft, the fuel metering window is delineated by a third crank angle of the crankshaft and a fourth crank angle of the crankshaft, and a first rotational distance between the first crank angle and the second crank angle is less than a second rotational distance between the third crank angle and the fourth crank angle, or
• the fuel injection window is delineated by a first time and a second time, the fuel metering window is delineated by a third time and a fourth time, and a first duration between the first time and the second time is less than a second duration between the third time and the fourth time.

An electronic control module (ECM) comprising:

• a memory configured to store instructions;
• and
• one or more processors configured to execute the instructions to:
• control a fuel injector to perform fuel injection, of at least one of first fuel or a second fuel into a cylinder of an engine, during a fuel injection window;
• and
• control the fuel injector to perform fuel metering, the fuel metering including actuating a valve of the fuel injector to introduce the second fuel into a nozzle of the fuel injector while the fuel injector is not injecting either of the first fuel or the second fuel into the cylinder of the engine, during a fuel metering window that is greater than the fuel injection window.

A system comprising:

• a fuel injector configured to perform fuel injection and fuel metering;
• and
• an electronic control module (ECM) configured to:
• control the fuel injector to perform the fuel injection, of at least one of a first fuel or a second fuel into a cylinder of an engine, during a fuel injection window;
• and
• control the fuel injector to perform the fuel metering, the fuel metering including actuating a valve of the fuel injector to introduce the second fuel into a nozzle of the fuel injector while the fuel injector is not injecting either of the first fuel or the second fuel into the cylinder of the engine, during a fuel metering window that is asymmetric to the fuel injection window, wherein:
• the fuel injection window is delineated by a first time and a second time,
• the fuel metering window is delineated by a third time and a fourth time, and
• a first duration between the first time and the second time is less than a second duration between the third time and the fourth time.