Methods and systems for port fuel injection control
AssigneeFord Global Technologies, LLC
InventorsStephen George Russ, Joseph Lyle Thomas, Scott Allan Lehto, Christopher Arnold Woodring, Jeanne Wei, David Shelley
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for reducing hot fuel vapor formation in a port injection fuel rail. In one example, a method may include operating a dual fuel injection system with at least a calibrated minimum amount of port fuel injection over a wide range of engine operating conditions, even as conditions change. A direct fuel injection amount is adjusted in accordance.
Claims20
A method, comprising:
- during a non-degradation mode of a dual injection system for delivering fuel to an engine,
- pressurizing fuel, via raising a pressure of fuel above a pressure of a low pressure fuel pump, in each of a port injection fuel rail and a direct injection fuel rail via an engine-driven high pressure fuel pump, the port injection fuel rail coupled to a plurality of port fuel injectors each arranged in a respective engine intake air port, and the direct injection fuel rail coupled to a plurality of direct fuel injectors;
- and
- over any and every engine non-starting operating condition, after the engine is warmed up, fueling the engine with at least a calibrated minimum amount greater than zero of port injected fuel for every combustion event, the fueling including determining that the engine is operating in a warmed up non-starting operating condition where only direct injected fueling is requested, and in response, fueling the engine with at least the calibrated minimum amount of port injected fuel and delivering a remainder of a total fuel injection amount via direct injection for every combustion event.
A method for a dual injection system for delivering fuel to an engine, comprising:
- during any and every non-starting engine operating condition, after the engine is warmed up, when fuel is requested via direct injection only and while in a non-degradation mode of the system:
- overriding the fuel request and delivering fuel, pressurized to a pressure above a pressure of a low pressure fuel pump via an engine-driven high pressure fuel pump, as a first calibrated minimum amount of port injected fuel and a second, remaining amount of direct injected fuel.
A method for an engine enabled with dual injection of fuel, comprising:
- over any and every engine non-starting operating condition, after the engine is warmed up, while a fuel system is in a non-degradation mode, fueling the engine with at least a calibrated minimum amount of port injected fuel for each combustion event including when only direct injected fueling is requested;
- and
- only partially fueling the engine with direct injected fuel over all engine operating conditions, when combustion is enabled, fuel in each of a port injection fuel rail and a direct injection fuel rail pressurized to a pressure that is raised relative to a pressure of a low pressure fuel pump via an engine-driven high pressure fuel pump, the port injection fuel rail coupled to a plurality of port fuel injectors each arranged in a respective engine intake air port, and the direct injection fuel rail coupled to a plurality of direct fuel injectors.
Dependencies are inferred from the claim text.