	US 12,078,121 B2
	Fuel injector control strategy for intake vacuum based low pressure fuel system
Takashi Abei, Sendai (JP); Tatsuya Chiba, Sendai (JP); and Mark S. Swanson, Concord, NC (US)
Assigned to Walbro LLC, Cass City, MI (US)
Filed by Walbro LLC, Cass City, MI (US)
Filed on Sep. 5, 2023, as Appl. No. 18/242,455.
Application 18/242,455 is a continuation of application No. 17/780,724, granted, now 11,773,803, previously published as PCT/US2020/062821, filed on Dec. 2, 2020.
Claims priority of provisional application 62/942,339, filed on Dec. 2, 2019.
Prior Publication US 2023/0407809 A1, Dec. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F02D 41/34 (2006.01); F02D 41/14 (2006.01); F02D 41/24 (2006.01)

CPC F02D 41/34 (2013.01) [F02D 41/1475 (2013.01); F02D 41/2422 (2013.01); F02D 2200/021 (2013.01); F02D 2200/0404 (2013.01); F02D 2200/0406 (2013.01); F02D 2200/0602 (2013.01); F02D 2200/101 (2013.01)]

19 Claims

1. A method of controlling fuel injection events in a system in which fuel injection occurs at a subatmospheric pressure, comprising:

determining at least two engine operating conditions including an engine speed, a position of a throttle valve, an ignition timing and an engine temperature;

determining a pressure in an engine intake chamber or at the outlet of a fuel injector;

initiating a fuel injection event as a function of the at least two engine operating conditions and the pressure, wherein the fuel injection event is initiated prior to a maximum subatmospheric pressure occurring and wherein the fuel injection event occurs for a duration such that the fuel injection event terminates after the maximum subatmospheric pressure occurs.