US 12,006,887 B2
Mixed fuel engine
Peter Staykov, Whiterock (CA); Daniel Ivan Handford, Edmonton (CA); Curtis Figley, Edmonton (CA); and Andrei Chichak, Edmonton (CA)
Assigned to Innovative Fuel Systems Ltd., Edmonton (CA)
Appl. No. 17/772,051
Filed by Innovative Fuel Systems Ltd., Edmonton (CA)
PCT Filed Oct. 28, 2020, PCT No. PCT/CA2020/051444
§ 371(c)(1), (2) Date Apr. 26, 2022,
PCT Pub. No. WO2021/081639, PCT Pub. Date May 6, 2021.
Claims priority of provisional application 62/927,223, filed on Oct. 29, 2019.
Prior Publication US 2022/0381191 A1, Dec. 1, 2022
Int. Cl. F02D 19/06 (2006.01); F02D 19/08 (2006.01); F02D 41/20 (2006.01); F02D 41/40 (2006.01)
CPC F02D 19/081 (2013.01) [F02D 19/061 (2013.01); F02D 19/0642 (2013.01); F02D 19/0692 (2013.01); F02D 41/20 (2013.01); F02D 41/402 (2013.01); F02D 2200/0614 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A mixed-fuel control circuit comprising:
an engine control unit that generates an injection signal and a fuel pump signal;
a fuel pump in fluid communication with a primary fuel source and a primary fuel rail, the fuel pump delivering fuel from the primary fuel source to the primary fuel rail in response to a received pump signal from the engine control unit;
a fuel injector in fluid communication with the primary fuel rail and a combustion engine, the fuel injector injecting fuel from the primary fuel rail into the combustion engine in response to a received injection signal; and
a mixed-fuel control unit comprising:
injector switches that selectively connect the engine control unit to a first sub-circuit and a second sub-circuit, the first sub-circuit comprising the fuel injector and a second sub-circuit comprising a dummy load; and
pump switches that control an amount of fuel that is delivered from the primary fuel source to the primary fuel rail;
wherein the mixed-fuel control unit is configured to:
switch between the first sub-circuit and the second sub-circuit such that a squelched portion of the injection signal is conducted through the second sub-circuit instead of the first sub-circuit and the received injection signal comprises a non-squelched portion of the injection signal; and
control the pump switches to reduce the amount of fuel that is delivered from the primary fuel source to the primary fuel rail based on the squelched portion of the received injection signal.