Injection timing
First Claim
1. A method for controlling a gas-powered internal combustion engine, comprising:
- determining an end of gaseous fuel injection, a duration of gaseous fuel injection, and a start of gaseous fuel injection in an induction pipe of a cylinder of the internal combustion engine based on one or more operating parameters;
determining an earliest possible start of gaseous fuel injection; and
if the start of gaseous fuel injection is before the earliest possible start of gaseous fuel injection, increasing a pressure in a gaseous fuel supply system and limiting a maximum flow rate of the injected gaseous fuel such that the start of gaseous fuel injection does not occur before the earliest possible start of gaseous fuel injection.
1 Assignment
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Accused Products
Abstract
Various systems and methods for determining a start of fuel injection including a gaseous fuel in an internal combustion engine are provided. In one embodiment, an end of gas injection, a duration of gas injection, and a start of gas injection in an induction pipe of a cylinder of an internal combustion engine is determined based on one or more operating parameters. An earliest possible start of gas injection is further determined, and if the start of gas injection is before the earliest possible start of gas injection, at least one of the one or more operating parameters is modified such that the start of gas injection does not occur before the earliest possible start of gas injection.
8 Citations
18 Claims
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1. A method for controlling a gas-powered internal combustion engine, comprising:
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determining an end of gaseous fuel injection, a duration of gaseous fuel injection, and a start of gaseous fuel injection in an induction pipe of a cylinder of the internal combustion engine based on one or more operating parameters; determining an earliest possible start of gaseous fuel injection; and if the start of gaseous fuel injection is before the earliest possible start of gaseous fuel injection, increasing a pressure in a gaseous fuel supply system and limiting a maximum flow rate of the injected gaseous fuel such that the start of gaseous fuel injection does not occur before the earliest possible start of gaseous fuel injection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16, 17)
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9. A method, comprising:
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adjusting fuel injection start timing of a gaseous fuel to an engine based on engine speed n, an air-fuel mixture density π
, an intake conduit cross-sectional area A, a distance S between a fuel injector and a cylinder intake valve, a mass flow rate of injected gaseous fuel m, and a pressure in an intake conduit; andadjusting fuel injection end timing (EOI) to a crank angle determined via the relation EOI=IVC−
2π
npAS/m, where IVC is the crank angle at which the intake valve is closed for a given rotation cycle. - View Dependent Claims (10, 11, 12, 18)
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13. An internal combustion engine, comprising:
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a cylinder comprising a combustion chamber; at least one fuel injector configured to inject at least a gaseous fuel from a supply system; and a controller including instructions for; determining a start of injection of the gaseous fuel based on a revolution rate of the internal combustion engine, a density of an air-fuel mixture, a cross-sectional area of an induction pipe, a distance between the fuel injector and an inlet opening of the combustion chamber, a mass flow rate of the gaseous fuel injected by the at least one fuel injector, a speed of the air-fuel mixture, a temperature of the air-fuel mixture, and a pressure in the induction pipe; determining an earliest start of injection of the gaseous fuel based on a geometry of the cylinder and a geometry of the induction pipe; and if the start of injection of the gaseous fuel is before the earliest start of injection of the gaseous fuel, limiting the mass flow rate of the gaseous fuel and increasing a pressure in the supply system of the gaseous fuel. - View Dependent Claims (14, 15)
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Specification