Methods and system for engine control
First Claim
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1. A method for fueling a cylinder of an engine with injectors, comprising:
- injecting fuel to the cylinder via a first fuel injector and a second fuel injector; and
obtaining and distinguishing an error associated with the first fuel injector or the second fuel injector from a common fuel system error, common to both the first and second injectors, as a function of a time rate of change of air-fuel ratio error based on exhaust sensor feedback and a fraction of fuel injected via the first fuel injector or the second fuel injector, and correcting each of the first and second errors based on the common fuel system error by determining a correction based on the common fuel system error; and
reducing each of the first error and the second error by applying the correction.
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Abstract
Systems and methods for determining air-fuel error in an engine fueled via direct and port fuel injection. Errors associated with individual fuel injection systems are distinguished from a common error based on trends in the error correction coefficients of the individual fuel injection systems. Adaptive fuel multipliers for each injection system are updated to account for the common error.
16 Citations
17 Claims
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1. A method for fueling a cylinder of an engine with injectors, comprising:
- injecting fuel to the cylinder via a first fuel injector and a second fuel injector; and
obtaining and distinguishing an error associated with the first fuel injector or the second fuel injector from a common fuel system error, common to both the first and second injectors, as a function of a time rate of change of air-fuel ratio error based on exhaust sensor feedback and a fraction of fuel injected via the first fuel injector or the second fuel injector, and correcting each of the first and second errors based on the common fuel system error by determining a correction based on the common fuel system error; and
reducing each of the first error and the second error by applying the correction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- injecting fuel to the cylinder via a first fuel injector and a second fuel injector; and
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9. A method for an engine fuel system with injectors, comprising:
- injecting fuel to an engine cylinder via a first fuel injector and a second fuel injector during a cylinder cycle, the first and second fuel injectors having distinct types of fuel injection;
obtaining and assigning a first portion of an air-fuel error from the cylinder during the cylinder cycle to a first error associated with the first fuel injector;obtaining and assigning a second portion of the air-fuel error to a second error associated with the second fuel injector; and
obtaining and assigning a third portion of the air-fuel error to a common error associated with the fuel system, wherein each of the first, second, and third portions is based on each of a first fuel fraction provided by the first fuel injector, a second fuel fraction provided by the second fuel injector, and the air-fuel error, the air-fuel error based on exhaust gas sensor feedback, wherein the assigning includes;
learning a first time rate of change in the air-fuel error with a change in the first fuel fraction;
learning a second time rate of change in the air-fuel error with a change in the second fuel fraction; and
if the first time rate is within a threshold difference of the second time rate, and each of the first and second time rates is higher than a threshold, assigning a minimum of the first time rate and the second time rate to the common error. - View Dependent Claims (10, 11, 12, 13, 14)
- injecting fuel to an engine cylinder via a first fuel injector and a second fuel injector during a cylinder cycle, the first and second fuel injectors having distinct types of fuel injection;
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15. An engine system, comprising:
- an engine including a cylinder;
a port fuel injector in fluidic communication with the cylinder;
a direct fuel injector in fluidic communication with the cylinder;
an exhaust air-fuel ratio sensor; and
a controller including executable instructions stored in non-transitory memory for;
while operating the engine with closed loop air-fuel ratio control based on feedback from the air-fuel ratio sensor, updating an adaptive fuel multiplier for each of the port fuel injector and the direct fuel injector with a correction factor based on a common error in airflow to both the port fuel injector and the direct fuel injector, the common error estimated based on a ratio of a change in air-fuel error to a change in fuel fraction from the port fuel injector and the direct fuel injector during engine fueling; and
adjusting fueling via one or more of the port and direct fuel injectors using the adaptive fuel multipliers, the air-fuel error based on an exhaust gas sensor, wherein the adaptive fuel multiplier for the port fuel injector is based on a first ratio of the change in air-fuel error to the change in fuel fraction from the port fuel injector, wherein the adaptive fuel multiplier for the direct fuel injector is based on a second ratio of the change in air-fuel error to the change in fuel fraction from the direct fuel injector, wherein the common error is based on a minimum of the first ratio and the second ratio when the first ratio and the second ratio are within a threshold of each other, and wherein the updating includes reducing the adaptive fuel multiplier for each of the port fuel injector and the direct fuel injector. - View Dependent Claims (16, 17)
- an engine including a cylinder;
Specification