US 11,946,430 B2
Optimized energy waveform for fuel injector trimming based on valve arrival time
Mitchell B Juchems, Tremont, IL (US); and Daniel Reese Puckett, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Dec. 22, 2021, as Appl. No. 17/560,055.
Prior Publication US 2023/0193844 A1, Jun. 22, 2023
Int. Cl. F02D 41/20 (2006.01); F02D 41/40 (2006.01)
CPC F02D 41/20 (2013.01) [F02D 41/401 (2013.01); F02D 2041/2013 (2013.01); F02D 2041/2051 (2013.01); F02D 2041/2055 (2013.01); F02D 2041/2058 (2013.01)] 19 Claims
OG exemplary drawing
 
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.