Methods and systems for adjusting a direct fuel injector
First Claim
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1. A cylinder fueling method, comprising:
- supplying a first pulse width and a second pulse width to a direct fuel injector of a first cylinder during a cycle of the first cylinder, the first pulse width operating the direct fuel injector in a non-linear operating region, the second pulse width operating the direct fuel injector in a non-ballistic operating region, and where an engine in which the direct fuel injector operates to supply fuel to the first cylinder operates with only port fuel injectors supplying fuel to the engine'"'"'s cylinders other than the first cylinder when the direct fuel injector is operating in the non-linear operating region; and
decreasing the first pulse width a plurality of times while simultaneously increasing the second pulse width the plurality of times until the first pulse width is less than a threshold pulse width.
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Abstract
Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from two different fuel injectors is disclosed. In one example, a transfer function or gain of a direct fuel injector is adjusted in response to an exhaust lambda value and a first pulse width of two pulse widths provided to an injector of a cylinder during a cylinder cycle.
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Citations
17 Claims
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1. A cylinder fueling method, comprising:
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supplying a first pulse width and a second pulse width to a direct fuel injector of a first cylinder during a cycle of the first cylinder, the first pulse width operating the direct fuel injector in a non-linear operating region, the second pulse width operating the direct fuel injector in a non-ballistic operating region, and where an engine in which the direct fuel injector operates to supply fuel to the first cylinder operates with only port fuel injectors supplying fuel to the engine'"'"'s cylinders other than the first cylinder when the direct fuel injector is operating in the non-linear operating region; and decreasing the first pulse width a plurality of times while simultaneously increasing the second pulse width the plurality of times until the first pulse width is less than a threshold pulse width. - View Dependent Claims (2, 3, 4, 5, 13, 14, 15, 16, 17)
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6. A method for fueling a cylinder, comprising:
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operating an engine at a constant speed and air mass; supplying a first fuel fraction to a cylinder of the engine via a first fuel injector while supplying a second fuel fraction to the cylinder via a second fuel injector; and supplying a first pulse width and a second pulse width to the second fuel injector during a cylinder cycle in response to a request to characterize the second fuel injector; decreasing the first pulse width a plurality of times while simultaneously increasing the second pulse width the plurality of times until the first pulse width is less than a threshold pulse width; adjusting a control parameter of the second fuel injector in response to an exhaust lambda produced while the second fuel injector is operating in a non-linear region; and operating the second fuel injector based on the adjusted control parameter. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification