Internal combustion engine with barometic pressure related start of air compensation for a fuel injector
AssigneeBrunswick Corporation
InventorsJeffrey C. Ehlers, Blake R. Suhre
Life of this patent
Estimating the term…
Abstract
A control system for a fuel injector system for an internal combustion engine is provided with a method by which the magnitude of the start of air point for the injector system is modified according to the barometric pressure measured in a region surrounding the engine. This offset, or modification, of the start of air point adjusts the timing of the fuel injector system to suit different altitudes at which the engine may be operating.
Claims20
A method for controlling a fuel injector system of an internal combustion engine having at least one piston disposed within a cylinder, comprising:
- measuring the speed of said engine;
- measuring barometric pressure;
- measuring the absolute pressure within a manifold of said engine;
- determining the piston position at which to begin fuel flow into said fuel injector system;
- determining the piston position at which to end fuel flow into said fuel injector system;
- determining the piston position at which to begin air flow from said fuel injector system and into said cylinder;
- determining the piston position at which to end air flow from said fuel injector system and into said cylinder;
- altering said piston position at which to begin said air flow as a function of said barometric pressure.
A method for controlling a fuel injector system of an internal combustion engine having at least one piston disposed within a cylinder, comprising:
- measuring the speed of said engine;
- measuring barometric pressure;
- measuring the absolute pressure within a manifold of said engine;
- determining the piston position at which to begin fuel flow into said fuel injector system;
- determining the piston position at which to end fuel flow into said fuel injector system;
- determining the piston position at which to begin air flow from said fuel injector system and into said cylinder;
- determining the piston position at which to end air flow from said fuel injector system and into said cylinder;
- measuring an air charge temperature of said engine;
- determining a volumetric efficiency term as a function of said engine speed and a ratio of said absolute pressure within said manifold to said barometric pressure;
- determining a mass air flow into a combustion chamber of said engine as a function of said temperature, said absolute pressure within said manifold and said barometric pressure;
- and
- altering said piston position at which to begin said air flow as a function of said barometric pressure.
A method for controlling a fuel injector system of an internal combustion engine having at least one piston disposed within a cylinder, comprising:
- measuring the speed of said engine;
- measuring barometric pressure;
- measuring the absolute pressure within a manifold of said engine;
- determining the piston position at which to begin fuel flow into said fuel injector system;
- determining the piston position at which to end fuel flow into said fuel injector system, said steps of determining said piston position at which to begin fuel flow into said fuel injector system and said piston position at which to end fuel flow into said fuel injector system is performed as a function of a desired engine speed and a fuel flow rate empirically determined for said engine;
- determining the piston position at which to begin air flow from said fuel injector system and into said cylinder;
- determining the piston position at which to end air flow from said fuel injector system and into said cylinder;
- measuring an air charge temperature of said engine;
- determining a volumetric efficiency term as a function of said engine speed and a ratio of said absolute pressure within said manifold to said barometric pressure;
- determining a mass air flow into a combustion chamber of said engine as a function of said temperature, said absolute pressure within said manifold and said barometric pressure;
- and
- altering said piston position at which to begin said air flow as a function of said barometric pressure.
Dependencies are inferred from the claim text.