Patent ID: 11946430
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. A fuel system for an engine comprising:
a fuel injector including a solenoid actuator and a valve operably coupled to the solenoid actuator and movable between a first position and a second position;
a boosted voltage power supply;
a lower voltage power supply;
a fueling control unit structured to:
energize the solenoid actuator using the boosted voltage power supply and the lower voltage power supply to adjust the valve from the first position to the second position;
switch between the boosted voltage power supply and the lower voltage power supply to generate a solenoid energizing waveform including a pull-in tier produced by a boosted voltage incipient current, a boosted voltage second current, and a lower voltage later current;
detect an arrival timing of the valve at the second position;
calculate a valve arrival time error; and
trim the fuel injector via closed loop varying of a current duration and a start of current timing of the boosted voltage incipient current based on the valve arrival time error.