Fuel injector control strategy for intake vacuum based low pressure fuel system
AssigneeWalbro Corporation
InventorsTakashi Abei, Tatsuya Chiba, Mark S. Swanson
Life of this patent
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Abstract
In at least some implementations, a method of controlling fuel injection events, includes determining at least one engine operating condition, determining timing of a desired pressure in an engine intake chamber or at the outlet of a fuel injector, and initiating a fuel injection event as a function of the at least one engine operating condition and the desired pressure. The fuel injection event is initiated prior to the desired pressure occurring and wherein the fuel injection event occurs for a duration such that the fuel injection event terminates after the desired pressure occurs.
Claims19
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.
A method of controlling fuel injection events, comprising:
- determining an engine speed;
- determining a throttle position;
- determining a negative pressure in an engine intake chamber or at the outlet of a fuel injector, where the negative pressure is induced by movement of an engine piston;
- initiating a fuel injection event as a function of the engine speed, the throttle position and the negative pressure, wherein the fuel injection event is initiated prior to a maximum negative pressure occurring and wherein the fuel injection event terminates after the maximum negative pressure occurs.
Dependencies are inferred from the claim text.