Valve arrival time detection in fuel system having dual solenoid operated valves

A fuel system for an engine comprising:

• a fuel injector including a first solenoid actuator and a first valve operably coupled to the first solenoid actuator, and a second solenoid actuator and a fuel injection valve operably coupled to the second solenoid actuator;
• a boosted voltage power supply;
• a lower voltage power supply;
• a fueling control unit structured to:
• energize a first solenoid actuator to move the first valve from a first position to a second position;
• energize the second solenoid actuator to move the fuel injection valve from a closed position to an open position;
• generate a pull-in tier of a waveform energizing the second solenoid actuator via a first current produced by the boosted voltage power supply and a second current produced by the lower voltage power supply;
• and
• detect an arrival timing of the fuel injection valve at the second position based on a property of the second current.

A fuel control system for a fuel system in an engine comprising:

• a fueling control unit including a solenoid energizing waveform controller structured to:
• energize a first solenoid actuator in a fuel injector to move a first valve in the fuel injector from a first position to a second position;
• energize a second solenoid actuator in the fuel injector to move a second valve in the fuel injector from a closed position to an open position;
• generate a pull-in tier of a waveform energizing the second solenoid actuator via a first current produced by a first power supply and a second current produced by a second power supply;
• and
• detect an arrival timing of the second valve at the open position based on a property of the second current;
• and
• trim at least one of the voltage or a current of the fuel injector based on the detected arrival timing of the valve at the second position.