US 12,116,941 B1
Valve timing detection in fuel system using off cycle sweep
Mitchell B. Juchems, Eureka, IL (US); Daniel R. Puckett, Peoria, IL (US); Andrew O. Marrack, Peoria, IL (US); and Kaushik Krishnamurthy, Manteno, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Aug. 1, 2023, as Appl. No. 18/228,845.
Int. Cl. F02D 1/18 (2006.01); F02D 41/00 (2006.01)
CPC F02D 1/18 (2013.01) [F02D 41/009 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a fuel system for an engine comprising:
moving a plunger in a fuel system during a pumping cycle of the plunger between an advanced position and a retracted position;
pulsing a solenoid actuator in an electrical circuit during at least one off cycle of the plunger with a plurality of current pulses of varied duration;
monitoring an electrical property in the electrical circuit induced by moving a valve between a first position and a second position in response to each respective one of the plurality of current pulses; and
determining a valve timing of the valve based on the monitored electrical property.